* { box-sizing: border-box; }

:root {
  --glass-dropdown-filter: blur(30px) saturate(110%);
  --glass-navbar-filter: blur(22px) saturate(112%);
  --glass-major-filter: blur(20px) saturate(105%);
  --glass-panel-filter: blur(18px) saturate(104%);
  --glass-control-filter: blur(12px) saturate(104%);
  --glass-border: color-mix(in srgb, var(--color-border-strong) 62%, var(--color-border));
}

html { scroll-padding-top: calc(var(--header-height) + var(--space-5)); }

body {
  margin: 0;
  background: var(--color-bg-page);
  color: var(--color-text);
  font-family: var(--font-sans);
  line-height: 1.58;
}

a { color: var(--color-primary); text-decoration: none; }
a:hover { text-decoration: underline; }
a:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--color-primary) 34%, transparent);
  outline-offset: 3px;
  border-radius: 0.3rem;
}

h1, h2, h3 { color: var(--color-text); }
h1 {
  margin: 0 0 var(--space-3);
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800;
  line-height: 1.04;
  letter-spacing: -0.03em;
}
h2 {
  margin: 0 0 var(--space-3);
  font-size: 1.28rem;
  line-height: 1.2;
}

.app-shell {
  max-width: 1120px;
  margin: 0 auto;
  padding: var(--space-5) var(--space-4);
}

.top-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  min-height: var(--header-height);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  margin-bottom: var(--space-3);
}

.top-nav-row {
  min-height: var(--header-height);
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: var(--space-4);
  padding: 0 var(--space-3);
}

.brand {
  display: inline-flex;
  align-items: center;
  min-width: 154px;
  min-height: 44px;
}
.brand:hover { text-decoration: none; }
.brand:focus-visible {
  outline-offset: 4px;
}
.brand-logo {
  display: block;
  object-fit: contain;
  filter: drop-shadow(0 1px 2px rgba(0, 0, 0, 0.22));
}
.brand-logo-full {
  width: 154px;
  height: 42px;
}
.brand-logo-icon {
  display: none;
  width: 42px;
  height: 42px;
}

.nav-links,
.profile-switch {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.nav-links { overflow-x: auto; scrollbar-width: none; }
.nav-links::-webkit-scrollbar { display: none; }
.nav-links:focus-within { overflow: visible; }
.nav-links:has(.nav-menu.is-open) { overflow: visible; }
.profile-switch { justify-content: flex-end; white-space: nowrap; }

.nav-link,
.nav-current,
.profile-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 34px;
  padding: 0 var(--space-3);
  border-radius: var(--radius-pill);
  border: 1px solid var(--color-border);
  background: var(--color-bg-subtle);
  color: var(--color-text-muted);
  box-shadow: inset 0 1px 0 rgba(255, 239, 218, 0.07);
  font-size: 0.86rem;
  font-weight: 750;
  white-space: nowrap;
  transition: background var(--t-base), border-color var(--t-base), color var(--t-base);
}

.nav-link:hover,
.profile-link:hover {
  text-decoration: none;
  background: var(--color-primary-soft);
  border-color: var(--color-border-strong);
  color: var(--color-text);
}
.nav-link:focus-visible,
.profile-link:focus-visible,
.mobile-profile-menu summary:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--color-primary) 36%, transparent);
  outline-offset: 2px;
  border-color: var(--color-primary);
}

.nav-current,
.profile-link.active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-bg-page);
  box-shadow: inset 0 1px 0 rgba(255, 239, 218, 0.18), 0 1px 3px rgba(0, 0, 0, 0.24);
  cursor: default;
}

.nav-menu {
  position: relative;
  flex: 0 0 auto;
}
.nav-menu-trigger {
  appearance: none;
  font-family: inherit;
  list-style: none;
  cursor: pointer;
}
.nav-menu-trigger::after {
  content: "⌄";
  margin-left: var(--space-1);
  color: currentColor;
  font-size: 0.78rem;
  line-height: 1;
}
.nav-menu.is-open .nav-menu-trigger::after {
  transform: rotate(180deg);
}
.nav-menu.is-open .nav-menu-trigger,
.nav-menu-trigger--current {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-bg-page);
  box-shadow: none;
}
.nav-menu.is-open .nav-menu-trigger:not(:focus-visible) {
  outline: none;
}
.nav-menu-panel {
  position: absolute;
  top: calc(100% + var(--space-2));
  left: 0;
  z-index: 80;
  display: none;
  gap: var(--space-1);
  min-width: 230px;
  padding: var(--space-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-bg);
  box-shadow: var(--shadow-lg);
}
.nav-menu.is-open .nav-menu-panel:not([hidden]) {
  display: grid;
}
.nav-menu-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  min-height: 36px;
  padding: 0 var(--space-3);
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  font-size: 0.88rem;
  font-weight: 750;
  white-space: nowrap;
}
.nav-menu-link:hover {
  text-decoration: none;
  background: var(--color-primary-soft);
  color: var(--color-text);
}
.nav-menu-link:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--color-primary) 36%, transparent);
  outline-offset: 2px;
}
.nav-menu-link--current {
  background: var(--color-primary);
  color: var(--color-bg-page);
  box-shadow: inset 0 1px 0 rgba(255, 239, 218, 0.16);
}
.nav-menu-link--placeholder {
  cursor: default;
  color: var(--color-text-subtle);
}
.nav-menu-link--placeholder:hover {
  background: transparent;
  color: var(--color-text-subtle);
}
.nav-menu-status {
  color: var(--color-text-subtle);
  font-size: 0.68rem;
  font-weight: 850;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.profile-label {
  color: var(--color-text-subtle);
  font-size: 0.78rem;
  font-weight: 800;
}

.mobile-profile-menu { display: none; }

.mobile-profile-menu summary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 34px;
  padding: 0 var(--space-3);
  border-radius: var(--radius-pill);
  border: 1px solid var(--color-border);
  background: var(--color-primary);
  color: var(--color-bg-page);
  box-shadow: inset 0 1px 0 rgba(255, 239, 218, 0.18), 0 1px 3px rgba(0, 0, 0, 0.24);
  font-size: 0.86rem;
  font-weight: 850;
  cursor: pointer;
  list-style: none;
}
.mobile-profile-menu summary::-webkit-details-marker { display: none; }
.mobile-profile-panel {
  position: absolute;
  right: var(--space-3);
  top: calc(100% + var(--space-2));
  z-index: 80;
  display: grid;
  gap: var(--space-2);
  min-width: 180px;
  padding: var(--space-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-bg);
  box-shadow: var(--shadow-lg);
}

/* Existing brown surfaces gain translucency only where the browser can blur. */
@supports ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
  .top-nav {
    background: transparent;
    border-color: color-mix(in srgb, var(--color-border-strong) 64%, var(--color-border));
    box-shadow: var(--shadow-md), inset 0 1px 0 rgba(255, 239, 218, 0.12);
  }

  .top-nav::before {
    content: "";
    position: absolute;
    inset: 0;
    z-index: -1;
    border-radius: inherit;
    background: color-mix(in srgb, var(--color-bg) 84%, transparent);
    -webkit-backdrop-filter: var(--glass-navbar-filter);
    backdrop-filter: var(--glass-navbar-filter);
    pointer-events: none;
  }

  .nav-link:not(.nav-menu-trigger--current),
  .profile-link:not(.active) {
    background: color-mix(in srgb, var(--color-bg-subtle) 90%, transparent);
  }

  .nav-menu-panel,
  .mobile-profile-panel {
    background: color-mix(in srgb, var(--color-bg) 82%, transparent);
    border-color: color-mix(in srgb, var(--color-border-strong) 76%, var(--color-border));
    -webkit-backdrop-filter: var(--glass-dropdown-filter);
    backdrop-filter: var(--glass-dropdown-filter);
    box-shadow: 0 8px 22px rgba(0, 0, 0, 0.38), inset 0 1px 0 rgba(255, 239, 218, 0.11);
  }
}

@media (prefers-reduced-transparency: reduce) {
  .top-nav,
  .nav-menu-panel,
  .mobile-profile-panel {
    background: var(--color-bg);
    -webkit-backdrop-filter: none;
    backdrop-filter: none;
  }

  .top-nav::before {
    content: none;
  }

  .nav-link:not(.nav-menu-trigger--current),
  .profile-link:not(.active) {
    background: var(--color-bg-subtle);
  }
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  flex-wrap: wrap;
  margin: var(--space-2) 0 var(--space-4);
  color: var(--color-text-subtle);
  font-size: 0.78rem;
  font-weight: 750;
}
.breadcrumb a {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 0 var(--space-2);
  border-radius: var(--radius-pill);
  color: var(--color-text-muted);
}
.breadcrumb a:hover {
  background: var(--color-bg-subtle);
  color: var(--color-text);
  text-decoration: none;
}
.breadcrumb span {
  color: var(--color-border-strong);
}

.stretched-link::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
}

.hero,
.card,
.panel,
.module-card,
.question {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.hero {
  padding: var(--space-6) var(--space-6);
  margin-bottom: var(--space-6);
  background: linear-gradient(135deg, var(--color-bg), var(--color-primary-soft));
}
.hero h1,
.quiz-hero h1,
.page-header h1 {
  margin-bottom: var(--space-2);
  max-width: 860px;
  font-size: clamp(2rem, 4vw, 3rem);
  line-height: 1.06;
}
.hero .subtitle,
.quiz-hero .subtitle,
.page-header .subtitle {
  max-width: 760px;
}

.eyebrow {
  margin: 0 0 var(--space-1);
  color: var(--color-primary);
  font-size: 0.76rem;
  font-weight: 850;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.subtitle,
.muted,
.help {
  color: var(--color-text-muted);
}

.subtitle {
  margin: var(--space-2) 0 0;
  max-width: 800px;
  line-height: 1.65;
}

.button,
button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: 40px;
  padding: 0 var(--space-4);
  border: 1px solid var(--color-primary);
  border-radius: var(--radius-md);
  background: var(--color-primary);
  color: var(--color-bg-page);
  font: inherit;
  font-weight: 750;
  line-height: 1.1;
  text-align: center;
  cursor: pointer;
  transition: transform var(--t-base), background var(--t-base), border-color var(--t-base), color var(--t-base), box-shadow var(--t-base);
}
.button:hover,
button:hover {
  text-decoration: none;
  background: color-mix(in srgb, var(--color-primary) 84%, var(--color-bg));
  border-color: color-mix(in srgb, var(--color-primary) 88%, var(--color-border-strong));
  transform: translateY(-1px);
}
.button:focus-visible,
button:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--color-primary) 34%, transparent);
  outline-offset: 2px;
}
.button:active,
button:active {
  background: color-mix(in srgb, var(--color-primary) 76%, var(--color-bg));
  border-color: var(--color-primary);
  transform: translateY(0);
}
.button.secondary,
button.secondary {
  background: var(--color-bg-subtle);
  border-color: var(--color-border);
  color: var(--color-text);
}
.button.secondary:hover,
button.secondary:hover {
  background: var(--color-primary-soft);
  border-color: var(--color-border-strong);
  color: var(--color-text);
}
.button.ghost,
button.ghost {
  background: transparent;
  border-color: transparent;
  color: var(--color-text-muted);
}
.button.ghost:hover,
button.ghost:hover {
  background: var(--color-bg-subtle);
  border-color: var(--color-border);
  color: var(--color-text);
}
.button.danger,
.button.destructive,
button.danger,
button.destructive {
  background: var(--color-danger-soft);
  border-color: color-mix(in srgb, var(--color-danger) 76%, var(--color-border));
  color: var(--color-danger);
}
.button.danger:hover,
.button.destructive:hover,
button.danger:hover,
button.destructive:hover {
  background: color-mix(in srgb, var(--color-danger-soft) 72%, var(--color-bg));
  border-color: var(--color-danger);
  color: var(--color-danger);
}
.button:disabled,
button:disabled,
.button[aria-disabled="true"] {
  border-color: var(--color-border);
  background: var(--color-bg-subtle);
  color: var(--color-text-muted);
  opacity: 0.72;
  cursor: not-allowed;
  box-shadow: none;
  transform: none;
}
.button:disabled:hover,
button:disabled:hover,
.button[aria-disabled="true"]:hover {
  border-color: var(--color-border);
  background: var(--color-bg-subtle);
  color: var(--color-text-muted);
  text-decoration: none;
  transform: none;
}
.button.small { min-height: 32px; padding: 0 var(--space-3); font-size: 0.84rem; }
.back-link::before {
  content: "←";
  font-weight: 900;
}

.home-hero {
  padding: var(--space-8) var(--space-6);
}
.home-hero h1 {
  max-width: 860px;
}
.home-hero .subtitle {
  max-width: 700px;
  font-size: 1.04rem;
}
.home-hero-stats {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
  margin-top: var(--space-5);
}
.home-hero-stats span {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 0 var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  background: var(--color-bg-subtle);
  color: var(--color-text-muted);
  font-size: 0.84rem;
  font-weight: 850;
}

.mode-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--space-5);
  margin-bottom: var(--space-8);
}
.mode-card {
  display: flex;
  min-height: 236px;
  flex-direction: column;
  align-items: flex-start;
  padding: var(--space-5);
  border: 1px solid var(--color-border);
  border-top: 3px solid var(--color-primary);
  border-radius: var(--radius-lg);
  background: var(--color-bg);
  background: linear-gradient(145deg, var(--color-bg), color-mix(in srgb, var(--color-bg-subtle) 72%, var(--color-bg)));
  box-shadow: var(--shadow-sm);
  transition: transform var(--t-base), border-color var(--t-base), background var(--t-base), box-shadow var(--t-base);
}
.mode-card:hover {
  text-decoration: none;
  transform: translateY(-2px);
  border-color: var(--color-border-strong);
  background: linear-gradient(145deg, var(--color-bg), color-mix(in srgb, var(--color-primary-soft) 48%, var(--color-bg)));
  box-shadow: var(--shadow-md);
}
.mode-card:active {
  transform: translateY(0);
  box-shadow: var(--shadow-sm);
}
.mode-card:focus-visible,
.pinned-card:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--color-primary) 34%, transparent);
  outline-offset: 4px;
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
}
.mode-card h2 {
  margin-bottom: var(--space-2);
  font-size: 1.25rem;
}
.mode-card .subtitle {
  margin-top: 0;
  font-size: 0.94rem;
}
.mode-card--dzi {
  border-top-color: var(--color-accent-dzi);
  background: linear-gradient(145deg, var(--color-bg), var(--color-accent-dzi-soft));
}
.mode-card--physics {
  border-top-color: color-mix(in srgb, var(--color-success) 72%, var(--color-primary));
  background: linear-gradient(145deg, var(--color-bg), color-mix(in srgb, var(--color-success-soft) 76%, var(--color-bg)));
}
.mode-card--inactive {
  border-style: dashed;
  background: color-mix(in srgb, var(--color-bg-subtle) 62%, var(--color-bg));
  color: var(--color-text-muted);
  opacity: 0.82;
  cursor: default;
}
.mode-card--inactive:hover {
  transform: none;
  border-color: var(--color-border);
  background: color-mix(in srgb, var(--color-bg-subtle) 62%, var(--color-bg));
  box-shadow: var(--shadow-sm);
}
.mode-card--inactive .mode-action {
  color: var(--color-text-muted);
  transform: none;
}
.mode-action {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  margin-top: auto;
  padding-top: var(--space-5);
  color: var(--color-primary);
  font-size: 0.82rem;
  font-weight: 900;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  transition: color var(--t-base), transform var(--t-base);
}
.mode-card:hover .mode-action {
  color: color-mix(in srgb, var(--color-primary) 82%, var(--color-text));
  transform: translateX(2px);
}
.mode-card--dzi .mode-action {
  color: var(--color-accent-dzi);
}
.mode-card--dzi:hover .mode-action {
  color: color-mix(in srgb, var(--color-accent-dzi) 86%, var(--color-text));
}
.mode-card--physics .mode-action {
  color: color-mix(in srgb, var(--color-success) 78%, var(--color-primary));
}
.mode-card--physics:hover .mode-action {
  color: color-mix(in srgb, var(--color-success) 82%, var(--color-text));
}
.mode-actions {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
  margin-top: auto;
  padding-top: var(--space-5);
}
.mode-actions .button {
  min-height: 34px;
  padding: 0 var(--space-3);
  font-size: 0.84rem;
}
.mode-admin-link {
  margin-top: var(--space-2);
  color: var(--color-text-subtle);
  font-size: 0.78rem;
  font-family: var(--font-mono);
}

.home-section {
  margin-top: var(--space-2);
}
.home-dzi-section {
  margin: 0 0 var(--space-8);
  padding: var(--space-6);
  border: 2px solid color-mix(in srgb, var(--color-accent-dzi) 56%, var(--color-border));
  border-radius: var(--radius-xl);
  background: var(--color-bg);
  background: linear-gradient(135deg, color-mix(in srgb, var(--color-accent-dzi-soft) 72%, var(--color-bg)), var(--color-bg));
  box-shadow: var(--shadow-md);
}

.home-dzi-card {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--space-5);
  align-items: center;
  min-height: 168px;
  padding: var(--space-6);
  margin-bottom: 0;
  border: 1px solid color-mix(in srgb, var(--color-accent-dzi) 44%, var(--color-border));
  border-left: 7px solid var(--color-accent-dzi);
  border-radius: var(--radius-xl);
  background: linear-gradient(135deg, var(--color-bg), color-mix(in srgb, var(--color-accent-dzi-soft) 86%, var(--color-bg)));
  box-shadow: var(--shadow-lg);
  transition: transform var(--t-base), border-color var(--t-base), background var(--t-base), box-shadow var(--t-base);
}
.home-dzi-card:hover {
  text-decoration: none;
  transform: translateY(-2px);
  border-color: color-mix(in srgb, var(--color-accent-dzi) 62%, var(--color-border));
  background: linear-gradient(135deg, var(--color-bg), color-mix(in srgb, var(--color-accent-dzi-soft) 96%, var(--color-bg)));
  box-shadow: var(--shadow-lg);
}
.home-dzi-card:active {
  transform: translateY(0);
}
.home-dzi-card:focus-visible {
  border-color: color-mix(in srgb, var(--color-accent-dzi) 72%, var(--color-primary));
  box-shadow: var(--shadow-lg);
}
.home-dzi-title {
  margin: 0;
  color: var(--color-text);
  font-size: 1.9rem;
  font-weight: 800;
  line-height: 1.15;
}
.home-dzi-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 5.5rem;
  height: 5.5rem;
  border-radius: var(--radius-lg);
  background: var(--color-accent-dzi);
  color: var(--color-bg);
  font-size: 2.2rem;
  font-weight: 950;
  line-height: 1;
}
.home-dzi-stats {
  display: flex;
  gap: var(--space-3);
  margin-top: var(--space-3);
  color: var(--color-text-muted);
  font-weight: 600;
}
.home-subject-section {
  margin: 0 0 var(--space-8);
  padding: var(--space-6);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  background: var(--color-bg);
  background: linear-gradient(135deg, var(--color-bg), color-mix(in srgb, var(--color-bg-subtle) 78%, var(--color-bg)));
  box-shadow: var(--shadow-sm);
}
.home-subject-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-5);
}
.home-subject-card {
  min-height: 218px;
  margin-bottom: 0;
  padding: var(--space-6);
}
.home-subject-card--it {
  border-top-color: var(--color-primary);
}
.home-subject-card--physics {
  border-top-color: color-mix(in srgb, var(--color-success) 72%, var(--color-primary));
}
.home-subject-card--placeholder {
  border-top-color: color-mix(in srgb, var(--color-border-strong) 72%, var(--color-border));
}
.home-subject-card-link {
  color: inherit;
}
.home-subject-card-link:hover {
  text-decoration: none;
  color: var(--color-primary);
}
.home-subject-card-link:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--color-primary) 34%, transparent);
  outline-offset: 4px;
  border-radius: var(--radius-sm);
}
.home-subject-card--placeholder .home-subject-card-link,
.home-subject-card--placeholder .mode-action {
  cursor: pointer;
}
.home-subject-title {
  margin: 0 0 var(--space-2);
  color: var(--color-text);
  font-size: 1.45rem;
  font-weight: 850;
  line-height: 1.16;
}
.home-subject-stats {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
  margin-top: var(--space-3);
  color: var(--color-text-muted);
  font-weight: 650;
}
.home-subject-class-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: auto;
  padding-top: var(--space-5);
}
.home-subject-class-links a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 32px;
  padding: 0 var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  background: var(--color-bg-subtle);
  color: var(--color-text-muted);
  font-size: 0.82rem;
  font-weight: 850;
}
.home-subject-class-links a:hover {
  text-decoration: none;
  border-color: var(--color-border-strong);
  background: var(--color-primary-soft);
  color: var(--color-text);
}
.home-subject-class-links a:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--color-primary) 36%, transparent);
  outline-offset: 2px;
  border-color: var(--color-primary);
}
.home-subject-status {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 28px;
  margin-top: var(--space-4);
  padding: 0 var(--space-3);
  border: 1px solid color-mix(in srgb, var(--color-success) 42%, var(--color-border));
  border-radius: var(--radius-pill);
  background: color-mix(in srgb, var(--color-success-soft) 70%, var(--color-bg));
  color: color-mix(in srgb, var(--color-success) 84%, var(--color-text));
  font-size: 0.74rem;
  font-weight: 850;
  text-transform: uppercase;
}

.physics-hero {
  border-color: color-mix(in srgb, var(--color-success) 34%, var(--color-border));
  background: linear-gradient(135deg, var(--color-bg), color-mix(in srgb, var(--color-success-soft) 62%, var(--color-bg)));
}
.physics-pill,
.physics-status-badge {
  border-color: color-mix(in srgb, var(--color-success) 42%, var(--color-border));
  background: color-mix(in srgb, var(--color-success-soft) 70%, var(--color-bg));
  color: color-mix(in srgb, var(--color-success) 84%, var(--color-text));
}
.physics-status-panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: var(--space-5);
  align-items: center;
  border-color: color-mix(in srgb, var(--color-success) 30%, var(--color-border));
  background: linear-gradient(135deg, var(--color-bg), color-mix(in srgb, var(--color-bg-subtle) 72%, var(--color-bg)));
}
.physics-status-panel h2 {
  margin-bottom: var(--space-2);
}
.physics-status-panel .subtitle {
  max-width: 720px;
}
.physics-grade-shell {
  margin-top: var(--space-2);
}
.physics-soon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 5rem;
  height: 5rem;
  border: 1px solid color-mix(in srgb, var(--color-success) 44%, var(--color-border));
  border-radius: var(--radius-lg);
  background: color-mix(in srgb, var(--color-success-soft) 72%, var(--color-bg));
  color: var(--color-text);
  font-size: 0.9rem;
  font-weight: 950;
  text-transform: uppercase;
}
.physics-class-grid {
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
}
.physics-class-card {
  display: grid;
  grid-template-rows: auto 1fr auto;
  gap: var(--space-3);
  min-height: 210px;
  color: var(--color-text);
  border-top: 3px solid color-mix(in srgb, var(--color-success) 68%, var(--color-primary));
  background: linear-gradient(145deg, var(--color-bg), color-mix(in srgb, var(--color-success-soft) 48%, var(--color-bg)));
  transition: transform var(--t-base), border-color var(--t-base), background var(--t-base), box-shadow var(--t-base);
}
.physics-class-card:hover {
  text-decoration: none;
  transform: translateY(-2px);
  border-color: color-mix(in srgb, var(--color-success) 46%, var(--color-border));
  background: linear-gradient(145deg, var(--color-bg), color-mix(in srgb, var(--color-success-soft) 66%, var(--color-bg)));
  box-shadow: var(--shadow-md);
}
.physics-class-card:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--color-success) 34%, transparent);
  outline-offset: 4px;
  border-color: color-mix(in srgb, var(--color-success) 70%, var(--color-primary));
}
.physics-class-card h2 {
  margin-bottom: var(--space-1);
}
.physics-class-card .subtitle {
  margin: 0;
}
.physics-class-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 3.25rem;
  height: 3.25rem;
  border-radius: var(--radius-lg);
  background: color-mix(in srgb, var(--color-success) 72%, var(--color-primary));
  color: var(--color-bg);
  font-size: 1.55rem;
  font-weight: 950;
  line-height: 1;
}
.physics-placeholder-grid {
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}
.physics-placeholder-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  border-top: 3px solid color-mix(in srgb, var(--color-success) 68%, var(--color-primary));
}
.physics-placeholder-card h2 {
  margin-bottom: 0;
  font-size: 1.1rem;
}
.physics-placeholder-card .subtitle {
  margin: 0;
}
.physics-status-badge {
  align-self: flex-start;
  display: inline-flex;
  align-items: center;
  min-height: 26px;
  margin-top: auto;
  padding: 0 var(--space-3);
  border: 1px solid color-mix(in srgb, var(--color-success) 42%, var(--color-border));
  border-radius: var(--radius-pill);
  font-size: 0.74rem;
  font-weight: 850;
  text-transform: uppercase;
}
.physics-empty-state {
  margin-top: 0;
}

.subject-hero {
  border-color: color-mix(in srgb, var(--color-primary) 30%, var(--color-border));
  background: linear-gradient(135deg, var(--color-bg), color-mix(in srgb, var(--color-primary-soft) 58%, var(--color-bg)));
}
.subject-hero--placeholder {
  border-color: color-mix(in srgb, var(--color-success) 30%, var(--color-border));
  background: linear-gradient(135deg, var(--color-bg), color-mix(in srgb, var(--color-success-soft) 58%, var(--color-bg)));
}
.subject-meta {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-wrap: wrap;
  margin-top: var(--space-4);
  color: var(--color-text-muted);
  font-weight: 700;
}
.subject-pill,
.subject-status-badge {
  border-color: color-mix(in srgb, var(--color-success) 42%, var(--color-border));
  background: color-mix(in srgb, var(--color-success-soft) 70%, var(--color-bg));
  color: color-mix(in srgb, var(--color-success) 84%, var(--color-text));
}
.subject-status-panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: var(--space-5);
  align-items: center;
  border-color: color-mix(in srgb, var(--color-success) 30%, var(--color-border));
  background: linear-gradient(135deg, var(--color-bg), color-mix(in srgb, var(--color-bg-subtle) 72%, var(--color-bg)));
}
.subject-status-panel h2 {
  margin-bottom: var(--space-2);
}
.subject-status-panel .subtitle {
  max-width: 720px;
}
.subject-grade-shell {
  margin-top: var(--space-2);
}
.subject-soon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 5.75rem;
  min-height: 5rem;
  padding: var(--space-2);
  border: 1px solid color-mix(in srgb, var(--color-success) 44%, var(--color-border));
  border-radius: var(--radius-lg);
  background: color-mix(in srgb, var(--color-success-soft) 72%, var(--color-bg));
  color: var(--color-text);
  font-size: 0.9rem;
  font-weight: 950;
  text-align: center;
  text-transform: uppercase;
}
.subject-class-grid {
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
}
.subject-class-card {
  display: grid;
  grid-template-rows: auto 1fr auto;
  gap: var(--space-3);
  min-height: 210px;
  color: var(--color-text);
  border-top: 3px solid color-mix(in srgb, var(--color-success) 68%, var(--color-primary));
  background: linear-gradient(145deg, var(--color-bg), color-mix(in srgb, var(--color-success-soft) 48%, var(--color-bg)));
  transition: transform var(--t-base), border-color var(--t-base), background var(--t-base), box-shadow var(--t-base);
}
.subject-class-card--active {
  border-top-color: var(--color-primary);
  background: linear-gradient(145deg, var(--color-bg), color-mix(in srgb, var(--color-primary-soft) 48%, var(--color-bg)));
}
.subject-class-card:hover {
  text-decoration: none;
  transform: translateY(-2px);
  border-color: color-mix(in srgb, var(--color-success) 46%, var(--color-border));
  background: linear-gradient(145deg, var(--color-bg), color-mix(in srgb, var(--color-success-soft) 66%, var(--color-bg)));
  box-shadow: var(--shadow-md);
}
.subject-class-card--active:hover {
  border-color: var(--color-primary);
  background: linear-gradient(145deg, var(--color-bg), color-mix(in srgb, var(--color-primary-soft) 64%, var(--color-bg)));
}
.subject-class-card:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--color-success) 34%, transparent);
  outline-offset: 4px;
  border-color: color-mix(in srgb, var(--color-success) 70%, var(--color-primary));
}
.subject-class-card h2 {
  margin-bottom: var(--space-1);
}
.subject-class-card .subtitle {
  margin: 0;
}
.subject-class-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 3.25rem;
  height: 3.25rem;
  border-radius: var(--radius-lg);
  background: color-mix(in srgb, var(--color-success) 72%, var(--color-primary));
  color: var(--color-bg);
  font-size: 1.55rem;
  font-weight: 950;
  line-height: 1;
}
.subject-class-card--active .subject-class-number {
  background: var(--color-primary);
}
.subject-placeholder-grid {
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}
.subject-topic-group-grid {
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}
.subject-placeholder-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  border-top: 3px solid color-mix(in srgb, var(--color-success) 68%, var(--color-primary));
}
.subject-topic-group-card {
  display: grid;
  grid-template-rows: auto auto 1fr auto;
  gap: var(--space-2);
  min-height: 190px;
  color: var(--color-text);
  border-top: 3px solid color-mix(in srgb, var(--color-success) 68%, var(--color-primary));
  transition: transform var(--t-base), border-color var(--t-base), background var(--t-base), box-shadow var(--t-base);
}
.subject-topic-group-card:hover {
  text-decoration: none;
  transform: translateY(-2px);
  border-color: color-mix(in srgb, var(--color-success) 46%, var(--color-border));
  background: linear-gradient(145deg, var(--color-bg), color-mix(in srgb, var(--color-success-soft) 66%, var(--color-bg)));
  box-shadow: var(--shadow-md);
}
.subject-topic-group-card:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--color-success) 34%, transparent);
  outline-offset: 4px;
  border-color: color-mix(in srgb, var(--color-success) 70%, var(--color-primary));
}
.subject-topic-group-card h2 {
  margin-bottom: 0;
  font-size: 1.1rem;
}
.subject-topic-group-card .subtitle {
  margin: 0;
}
.subject-placeholder-card h2 {
  margin-bottom: 0;
  font-size: 1.1rem;
}
.subject-placeholder-card .subtitle {
  margin: 0;
}
.subject-status-badge {
  align-self: flex-start;
  display: inline-flex;
  align-items: center;
  min-height: 26px;
  margin-top: auto;
  padding: 0 var(--space-3);
  border: 1px solid color-mix(in srgb, var(--color-success) 42%, var(--color-border));
  border-radius: var(--radius-pill);
  font-size: 0.74rem;
  font-weight: 850;
  text-transform: uppercase;
}
.subject-empty-state {
  margin-top: 0;
}

.grade-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-5);
}

.grade-card {
  display: grid;
  grid-template-rows: auto 1fr;
  min-height: 188px;
  position: relative;
  overflow: hidden;
  padding: var(--space-6);
  background: linear-gradient(145deg, var(--color-bg), color-mix(in srgb, var(--color-bg-subtle) 64%, var(--color-bg)));
  border: 1px solid var(--color-border);
  border-top: 3px solid var(--color-primary);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: transform var(--t-base), box-shadow var(--t-base), border-color var(--t-base), opacity var(--t-base);
}
.grade-card:hover,
.grade-card:focus-visible {
  text-decoration: none;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-border-strong);
}
.grade-card:hover {
  background: linear-gradient(145deg, var(--color-bg), color-mix(in srgb, var(--color-primary-soft) 42%, var(--color-bg)));
}
.grade-card:active {
  transform: translateY(0);
  box-shadow: var(--shadow-sm);
}
.grade-card:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--color-primary) 32%, transparent);
  outline-offset: 3px;
}
.grade-card.disabled {
  border-style: dashed;
  background: color-mix(in srgb, var(--color-bg-subtle) 70%, var(--color-bg));
  color: var(--color-text-muted);
  opacity: 0.68;
  cursor: not-allowed;
  pointer-events: none;
  box-shadow: none;
}
.grade-card .label {
  position: relative;
  z-index: 1;
  margin-bottom: var(--space-4);
  color: var(--color-text);
  font-size: 1.14rem;
  font-weight: 900;
  text-transform: none;
  letter-spacing: 0;
}
.grade-card-ghost {
  position: absolute;
  right: var(--space-4);
  top: calc(var(--space-2) * -1);
  color: var(--color-text);
  font-size: 5.8rem;
  font-weight: 950;
  line-height: 1;
  opacity: 0.045;
  pointer-events: none;
}
.stat-row {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-3);
  align-self: end;
}
.stat-box {
  padding: var(--space-3);
  border-radius: var(--radius-md);
  background: color-mix(in srgb, var(--color-bg-subtle) 78%, var(--color-bg));
  border: 1px solid var(--color-border);
  text-align: center;
}
.stat-number {
  display: block;
  color: var(--color-text);
  font-size: 1.9rem;
  font-weight: 950;
  line-height: 1;
}
.stat-label {
  display: block;
  margin-top: var(--space-1);
  color: var(--color-text-muted);
  font-size: 0.72rem;
  font-weight: 900;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.pinned-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-5);
  margin-bottom: var(--space-6);
}
.pinned-card {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: var(--space-3);
  align-items: center;
  padding: var(--space-5);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--pin-color, var(--color-primary));
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: transform var(--t-base), border-color var(--t-base), background var(--t-base), box-shadow var(--t-base);
}
.pinned-card:hover {
  text-decoration: none;
  transform: translateY(-2px);
  border-color: color-mix(in srgb, var(--pin-color, var(--color-primary)) 46%, var(--color-border));
  background: color-mix(in srgb, var(--color-bg) 80%, var(--color-primary-soft));
  box-shadow: var(--shadow-md);
}
.pinned-card:active {
  transform: translateY(0);
  box-shadow: var(--shadow-sm);
}
.pin-icon { font-size: 1.5rem; }
.pin-title { color: var(--color-text); font-weight: 900; }
.pin-meta { color: var(--color-text-muted); font-size: 0.84rem; }

.module-card {
  margin-bottom: var(--space-6);
  overflow: hidden;
  border-top: 3px solid var(--module-color, var(--color-primary));
}
.module-titlebar {
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
  padding: var(--space-5);
  border-bottom: 1px solid var(--color-border);
  background: color-mix(in srgb, var(--module-color, var(--color-primary)) 9%, var(--color-bg));
}
.module-kicker {
  color: var(--module-color, var(--color-primary));
  font-size: 0.78rem;
  font-weight: 950;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.module-name {
  color: var(--color-text);
  font-size: 1.18rem;
  font-weight: 950;
  line-height: 1.25;
}
.section-list {
  display: grid;
  gap: var(--space-2);
  list-style: none;
  padding: var(--space-4);
  margin: 0;
}
.section-item {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-4);
  border: 1px solid transparent;
  border-left: 3px solid transparent;
  border-radius: var(--radius-md);
  transition: border-color var(--t-fast), background var(--t-fast), box-shadow var(--t-fast), transform var(--t-fast);
}
.section-item:hover {
  background: var(--color-bg-subtle);
  border-color: var(--color-border);
  border-left-color: var(--module-color, var(--color-primary));
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}
.section-item:active {
  transform: translateY(0);
}
.section-title-row {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
}
.section-title-row a {
  color: var(--color-text);
  font-weight: 850;
}
.admin-debug {
  display: block;
  margin-top: var(--space-1);
  color: var(--color-text-subtle);
  font-family: var(--font-mono);
  font-size: 0.75rem;
}
.count-pill,
.pill,
.badge,
.section-type-badge,
.question-number,
.type-badge,
.diff-easy,
.diff-medium,
.diff-hard,
.diff-unknown,
.status-pill,
.option-status,
.timer {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 24px;
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  font-size: 0.75rem;
  font-weight: 850;
  line-height: 1;
  text-align: center;
  white-space: nowrap;
}
.count-pill,
.pill {
  padding: var(--space-1) var(--space-3);
  background: var(--color-bg-subtle);
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
}
.pill--mixed {
  border-color: color-mix(in srgb, var(--color-primary) 44%, var(--color-border));
  background: color-mix(in srgb, var(--color-primary-soft) 66%, var(--color-bg));
  color: var(--color-primary);
}
.pill--combined {
  border-color: color-mix(in srgb, var(--color-success) 50%, var(--color-border));
  background: var(--color-success-soft);
  color: var(--color-success);
}
.badge,
.section-type-badge {
  padding: var(--space-1) var(--space-2);
  background: var(--color-primary-soft);
  border-color: color-mix(in srgb, var(--color-primary) 30%, var(--color-border));
  color: var(--color-primary);
}
.question-image-indicator {
  background: color-mix(in srgb, var(--color-warning-soft) 72%, var(--color-bg));
  border-color: color-mix(in srgb, var(--color-warning) 42%, var(--color-border));
  color: var(--color-warning);
}

.page-header,
.section-heading,
.question-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--space-4);
  margin-bottom: var(--space-5);
}
.page-header {
  padding: var(--space-5);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-primary);
  border-radius: var(--radius-lg);
  background: var(--color-bg);
  background: linear-gradient(135deg, var(--color-bg), color-mix(in srgb, var(--color-primary-soft) 42%, var(--color-bg)));
  box-shadow: var(--shadow-sm);
}
.page-header > div:first-child,
.section-heading > div:first-child,
.question-toolbar > div:first-child {
  min-width: 0;
}
.page-header h1,
.section-heading h2,
.question-toolbar h2 {
  overflow-wrap: anywhere;
}
.section-heading {
  padding-bottom: var(--space-2);
  border-bottom: 1px solid color-mix(in srgb, var(--color-border) 72%, transparent);
}
.section-heading h2,
.question-toolbar h2 {
  margin-bottom: var(--space-1);
}
.header-actions,
.links,
.actions,
.badges {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
}
.header-actions {
  justify-content: flex-end;
  align-items: center;
  flex-shrink: 0;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: var(--space-5);
  margin: var(--space-5) 0 var(--space-6);
}
.assignment-groups {
  display: grid;
  gap: var(--space-5);
}
.assignment-group {
  display: grid;
  gap: var(--space-3);
}
.assignment-group h3 {
  margin: 0;
  color: var(--color-text);
  font-size: 1rem;
}
.assignment-group-list {
  display: grid;
  gap: var(--space-3);
}
.assignment-mini-card {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: var(--space-4);
  padding: var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg-subtle);
  transition: border-color var(--t-fast), background var(--t-fast), box-shadow var(--t-fast), transform var(--t-fast);
}
.assignment-mini-card:hover,
.assignment-mini-card:focus-within {
  border-color: var(--color-border-strong);
  background: color-mix(in srgb, var(--color-bg-subtle) 72%, var(--color-primary-soft));
  box-shadow: var(--shadow-sm);
  transform: translateY(-1px);
}
.assignment-mini-card:active {
  transform: translateY(0);
}
.assignment-mini-title {
  display: inline-flex;
  margin-bottom: var(--space-2);
  color: var(--color-text);
  font-weight: 900;
}
.assignment-mini-meta {
  display: grid;
  justify-items: end;
  gap: var(--space-1);
  color: var(--color-text-muted);
  font-size: 0.86rem;
}
.assignment-mini-card .links {
  position: relative;
  z-index: 2;
}
.card,
.panel {
  padding: var(--space-5);
  margin-bottom: var(--space-5);
}
.teacher-form-card,
.teacher-list-card,
.teacher-filter-card,
.teacher-summary-card,
.teacher-table-card,
.teacher-open-answers-card {
  border-radius: var(--radius-lg);
}
.teacher-form-card {
  display: grid;
  gap: var(--space-4);
}
.teacher-form-section {
  display: grid;
  gap: var(--space-3);
  padding: var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: color-mix(in srgb, var(--color-bg-subtle) 54%, var(--color-bg));
}
.teacher-form-section .section-heading {
  margin-bottom: 0;
}
.teacher-form-section .section-heading .help {
  margin: var(--space-1) 0 0;
}
.teacher-form-card > label,
.teacher-form-card > .help {
  margin-top: 0;
}
.teacher-form-grid {
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}
.teacher-form-actions {
  display: flex;
  justify-content: flex-start;
  padding-top: var(--space-2);
}
.teacher-form-actions button {
  min-height: 46px;
  padding-inline: var(--space-5);
}
.teacher-stat-grid {
  gap: var(--space-3);
}
.teacher-stat-grid .card {
  margin-bottom: 0;
  padding: var(--space-4);
  background: linear-gradient(145deg, var(--color-bg), color-mix(in srgb, var(--color-bg-subtle) 70%, var(--color-bg)));
}
.dashboard-actions {
  align-items: stretch;
  gap: var(--space-3);
}
.dashboard-action-group {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: var(--space-2);
}
.dashboard-summary-grid .card {
  border-left: 3px solid color-mix(in srgb, var(--color-primary) 48%, var(--color-border));
}
.dashboard-summary-grid .muted {
  margin-top: var(--space-1);
  font-size: 0.84rem;
}
.dashboard-card {
  border-radius: var(--radius-lg);
}
.teacher-results-overview .card {
  border-left: 3px solid color-mix(in srgb, var(--color-primary) 56%, var(--color-border));
}
.teacher-results-overview .muted {
  margin-top: var(--space-1);
  font-size: 0.84rem;
}
.teacher-results-actions {
  max-width: 360px;
}
.teacher-results-actions .button {
  width: 100%;
  justify-content: center;
}
.teacher-filter-card {
  padding: var(--space-4);
}
.teacher-filter-heading {
  margin-bottom: var(--space-3);
}
.filter-bar {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-wrap: wrap;
}
.filter-bar label {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  margin: 0;
  font-weight: 750;
}
.filter-bar > label[for],
.filter-bar > .label {
  color: var(--color-text-muted);
  font-size: 0.78rem;
  font-weight: 900;
}
.filter-bar input[type="radio"] {
  width: auto;
  accent-color: var(--color-primary);
}
.filter-bar input[type="search"],
.filter-bar select {
  width: auto;
  min-width: 180px;
}
.filter-bar input:disabled,
.filter-bar select:disabled {
  min-width: 180px;
}
.table-wrap {
  position: relative;
  max-width: 100%;
  overflow-x: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background:
    linear-gradient(90deg, var(--color-bg) 30%, transparent),
    linear-gradient(270deg, var(--color-bg) 30%, transparent) 100% 0,
    linear-gradient(90deg, color-mix(in srgb, var(--color-text) 12%, transparent), transparent),
    linear-gradient(270deg, color-mix(in srgb, var(--color-text) 12%, transparent), transparent) 100% 0;
  background-attachment: local, local, scroll, scroll;
  background-color: var(--color-bg);
  background-repeat: no-repeat;
  background-size: 32px 100%, 32px 100%, 12px 100%, 12px 100%;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}
.table-wrap table {
  margin: 0;
}
.teacher-table {
  min-width: 760px;
}
.table-wrap--wide table {
  min-width: 1120px;
}
.teacher-table th {
  position: sticky;
  top: 0;
  z-index: 1;
}
.teacher-table tbody tr {
  background: var(--color-bg);
}
.teacher-table tbody tr:nth-child(even) {
  background: color-mix(in srgb, var(--color-bg-subtle) 50%, var(--color-bg));
}
.teacher-table td {
  line-height: 1.5;
}
.teacher-table th,
.teacher-table td {
  min-width: 88px;
}
.teacher-table th:first-child,
.teacher-table td:first-child {
  min-width: 140px;
}
.teacher-table th:last-child,
.teacher-table td:last-child {
  min-width: 140px;
}
.teacher-table .links {
  gap: var(--space-1);
}
.teacher-table .links a,
.teacher-table .link-button {
  min-height: 30px;
  padding: var(--space-1) var(--space-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  background: var(--color-bg);
  color: var(--color-text);
  font-size: 0.82rem;
  font-weight: 800;
}
.teacher-table .links a:hover,
.teacher-table .link-button:hover {
  text-decoration: none;
  border-color: var(--color-border-strong);
  background: var(--color-primary-soft);
}
.inline-form {
  display: inline-flex;
  margin: 0;
}
.link-button {
  min-height: auto;
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--color-primary);
  font: inherit;
  font-weight: 750;
  cursor: pointer;
}
.link-button:disabled {
  color: var(--color-text-muted);
  cursor: not-allowed;
  opacity: 0.7;
}
.link-button:hover {
  background: transparent;
  text-decoration: underline;
  transform: none;
}
.link-button:disabled:hover {
  color: var(--color-text-muted);
  text-decoration: none;
}
.link-button:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--color-primary) 30%, transparent);
  outline-offset: 2px;
}
.teacher-table--dense th,
.teacher-table--dense td {
  padding: var(--space-2);
}
.teacher-table--dense {
  min-width: 1180px;
}
.teacher-table--dense th,
.teacher-table--dense td {
  min-width: 96px;
}
.teacher-table--dense th:last-child,
.teacher-table--dense td:last-child {
  min-width: 260px;
}
.teacher-open-answers-card {
  display: grid;
  gap: var(--space-4);
}
.mix-card {
  padding: var(--space-4);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  text-align: center;
}
.mix-card .label {
  margin-bottom: var(--space-2);
}
.detail-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: var(--space-4);
}
.open-question-panel {
  display: grid;
  gap: var(--space-4);
  margin-top: var(--space-4);
  padding: var(--space-4);
  border: 1px solid color-mix(in srgb, var(--color-warning) 46%, var(--color-border));
  border-radius: var(--radius-md);
  background: color-mix(in srgb, var(--color-warning-soft) 42%, var(--color-bg-subtle));
}
.open-question-toggle {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: start;
  gap: var(--space-3);
  margin: 0;
  cursor: pointer;
}
.open-question-toggle input[type="checkbox"] {
  width: 1.65rem;
  height: 1.65rem;
  margin: 0.1rem 0 0;
  accent-color: var(--color-primary);
  cursor: pointer;
}
.open-question-toggle-title {
  display: block;
  color: var(--color-text);
  font-size: 1.05rem;
  font-weight: 950;
  line-height: 1.25;
}
.open-question-toggle-help {
  display: block;
  margin-top: var(--space-1);
  color: var(--color-text-muted);
  font-weight: 650;
  line-height: 1.45;
  overflow-wrap: anywhere;
}
.open-question-controls {
  display: grid;
  grid-template-columns: minmax(180px, 260px) minmax(0, 1fr);
  gap: var(--space-4);
  align-items: end;
}
.open-question-count label {
  margin-top: 0;
}
.open-question-availability {
  display: grid;
  gap: var(--space-1);
  min-height: 76px;
  padding: var(--space-3) var(--space-4);
  border-left: 3px solid var(--color-warning);
  border-radius: var(--radius-md);
  background: color-mix(in srgb, var(--color-bg) 62%, var(--color-warning-soft));
  color: var(--color-text-muted);
}
.open-question-availability strong {
  color: var(--color-text);
  font-size: 1.45rem;
  line-height: 1;
}
.practical-assignment-panel {
  display: grid;
  gap: var(--space-4);
  margin-top: var(--space-5);
  padding: var(--space-4);
  border: 1px solid color-mix(in srgb, var(--color-accent-dzi) 46%, var(--color-border));
  border-radius: var(--radius-md);
  background: color-mix(in srgb, var(--color-accent-dzi-soft) 36%, var(--color-bg-subtle));
}
.practical-assignment-panel h3 {
  margin: 0;
  font-size: 1.08rem;
}
.practical-assignment-panel .eyebrow {
  margin-bottom: var(--space-1);
}
.practical-source-list {
  display: grid;
  gap: var(--space-3);
}
.practical-source-option {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: var(--space-3);
  align-items: center;
  padding: var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: color-mix(in srgb, var(--color-bg) 70%, var(--color-accent-dzi-soft));
}
.practical-source-option div {
  display: grid;
  gap: var(--space-1);
  min-width: 0;
}
.practical-source-option strong {
  color: var(--color-text);
}
.practical-source-option span {
  color: var(--color-text-muted);
  overflow-wrap: anywhere;
}
.dzi-hero {
  border-top: 3px solid var(--color-accent-dzi);
  background: linear-gradient(135deg, var(--color-bg), color-mix(in srgb, var(--color-accent-dzi-soft) 68%, var(--color-bg)));
}
.dzi-page-header {
  border-left-color: var(--color-accent-dzi);
  background: linear-gradient(135deg, var(--color-bg), color-mix(in srgb, var(--color-accent-dzi-soft) 48%, var(--color-bg)));
}
.dzi-start-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-3);
}
.dzi-start-summary {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: var(--space-3);
  max-width: 860px;
  margin-top: var(--space-4);
}
.dzi-start-summary-item {
  padding: var(--space-3);
  border: 1px solid color-mix(in srgb, var(--color-accent-dzi) 36%, var(--color-border));
  border-radius: var(--radius-md);
  background: color-mix(in srgb, var(--color-bg) 72%, var(--color-accent-dzi-soft));
}
.dzi-start-summary-item .label {
  display: block;
  color: var(--color-text-muted);
  font-size: 0.82rem;
  font-weight: 800;
  text-transform: uppercase;
}
.dzi-start-summary-item strong {
  display: block;
  margin-top: var(--space-1);
  color: var(--color-text);
  font-size: 1.12rem;
  line-height: 1.2;
}
.dzi-warning {
  border-color: color-mix(in srgb, var(--color-accent-dzi) 42%, var(--color-border));
  background: color-mix(in srgb, var(--color-accent-dzi-soft) 45%, var(--color-warning-soft));
}
.dzi-panel,
.practical-submissions-card {
  border-radius: var(--radius-lg);
}
.dzi-stat-row {
  gap: var(--space-3);
}
.dzi-stat-row .stat-box {
  background: color-mix(in srgb, var(--color-bg) 72%, var(--color-accent-dzi-soft));
}
.dzi-mix-grid {
  gap: var(--space-3);
}
.dzi-generator-panel {
  display: grid;
  gap: var(--space-3);
}
.dzi-training-form {
  display: grid;
  gap: var(--space-3);
  max-width: 620px;
}
.dzi-training-form label {
  margin: 0;
}
.dzi-training-form button {
  justify-self: start;
  min-height: 44px;
  padding-inline: var(--space-5);
}
.dzi-source-grid {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}
.dzi-source-card {
  display: grid;
  gap: var(--space-4);
  transition: border-color var(--t-base), box-shadow var(--t-base), transform var(--t-base);
}
.dzi-source-card:hover {
  border-color: color-mix(in srgb, var(--color-accent-dzi) 42%, var(--color-border-strong));
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}
.dzi-source-card:active {
  transform: translateY(0);
  box-shadow: var(--shadow-sm);
}
.dzi-source-card .question-header,
.dzi-task-card .question-header {
  margin-bottom: var(--space-3);
}
.practical-task-card .question-header {
  margin-bottom: 0;
}
.dzi-source-card .button {
  justify-self: start;
}
.dzi-toolbar {
  align-items: center;
  padding: var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: color-mix(in srgb, var(--color-bg) 86%, var(--color-accent-dzi-soft));
  box-shadow: var(--shadow-sm);
}
.dzi-task-section {
  margin-top: var(--space-6);
}
.dzi-task-section > h2 {
  margin-bottom: var(--space-4);
}
.dzi-task-card,
.practical-task-card {
  border-top: 3px solid color-mix(in srgb, var(--color-accent-dzi) 65%, var(--color-border));
  transition: border-color var(--t-base), box-shadow var(--t-base);
}
.dzi-task-card:hover,
.practical-task-card:hover {
  border-color: color-mix(in srgb, var(--color-accent-dzi) 46%, var(--color-border-strong));
  box-shadow: var(--shadow-md);
}
.dzi-task-card .prompt,
.practical-task-card .prompt {
  line-height: 1.7;
}
.practical-tasks-list {
  max-width: 960px;
}
.practical-task-card {
  display: grid;
  gap: var(--space-5);
}
.practical-task-header {
  align-items: flex-start;
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--color-border);
}
.practical-task-heading {
  min-width: 0;
}
.practical-task-source {
  margin: 0 0 var(--space-1);
  color: var(--color-text-muted);
  font-size: 0.82rem;
  font-weight: 850;
  line-height: 1.35;
  overflow-wrap: anywhere;
}
.practical-task-title {
  margin: 0;
  color: var(--color-text);
  font-size: 1.35rem;
  line-height: 1.25;
}
.practical-task-meta {
  justify-content: flex-end;
}
.practical-task-section-block {
  display: grid;
  gap: var(--space-3);
  min-width: 0;
}
.practical-task-section-block + .practical-task-section-block {
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-border);
}
.practical-section-title,
.practical-subsection-title {
  margin: 0;
  color: var(--color-text);
  font-size: 0.95rem;
  font-weight: 900;
  line-height: 1.3;
}
.practical-subsection-title {
  margin-top: var(--space-1);
}
.practical-brief-block {
  padding: var(--space-4);
  border-left: 3px solid color-mix(in srgb, var(--color-accent-dzi) 62%, var(--color-border));
  border-radius: var(--radius-md);
  background: color-mix(in srgb, var(--color-accent-dzi-soft) 42%, var(--color-bg));
}
.practical-task-card .prompt {
  max-width: 72ch;
  margin: 0;
}
.practical-resource-list,
.practical-step-list,
.practical-output-list {
  display: grid;
  gap: var(--space-3);
  padding: 0;
  margin: 0;
  list-style: none;
}
.practical-resource-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: var(--space-1) var(--space-4);
  align-items: center;
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--color-border);
  border-left: 3px solid color-mix(in srgb, var(--color-accent-dzi) 52%, var(--color-border));
  border-radius: var(--radius-md);
  background: var(--color-bg-subtle);
}
.practical-resource-title {
  min-width: 0;
  color: var(--color-text);
  font-weight: 850;
  line-height: 1.45;
  overflow-wrap: anywhere;
}
.practical-resource-meta {
  min-width: 0;
  color: var(--color-text-muted);
  font-size: 0.85rem;
  line-height: 1.4;
  overflow-wrap: anywhere;
}
.practical-resource-action {
  display: inline-flex;
  grid-column: 2;
  grid-row: 1 / span 2;
  align-items: center;
  justify-self: end;
}
.practical-step-card {
  display: grid;
  grid-template-columns: 32px minmax(0, 1fr);
  gap: var(--space-3);
  align-items: flex-start;
  padding: var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: color-mix(in srgb, var(--color-bg-subtle) 72%, var(--color-bg));
}
.practical-step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border: 1px solid color-mix(in srgb, var(--color-accent-dzi) 40%, var(--color-border));
  border-radius: var(--radius-pill);
  background: var(--color-bg);
  color: var(--color-accent-dzi);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 900;
  line-height: 1;
}
.practical-step-card p {
  max-width: 72ch;
  margin: 0;
  color: var(--color-text);
  line-height: 1.68;
  overflow-wrap: break-word;
}
.practical-output-item {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  align-items: center;
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg-subtle);
  color: var(--color-text);
  line-height: 1.5;
  overflow-wrap: anywhere;
}
.practical-status-note {
  display: grid;
  gap: var(--space-2);
  margin: 0;
  padding: var(--space-3) var(--space-4);
  border-left: 3px solid color-mix(in srgb, var(--color-success) 54%, var(--color-border));
  border-radius: var(--radius-md);
  background: color-mix(in srgb, var(--color-success-soft) 34%, var(--color-bg-subtle));
  color: var(--color-text);
}
.practical-status-note p {
  margin: 0;
  line-height: 1.55;
}
.practical-uploaded-block {
  display: grid;
  gap: var(--space-2);
}
.practical-upload-form {
  display: grid;
  gap: var(--space-3);
  margin-top: 0;
  padding: var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg-subtle);
}
.practical-upload-form label {
  margin: 0;
}
.practical-upload-form button {
  justify-self: start;
}
.label {
  color: var(--color-text-muted);
  font-size: 0.76rem;
  font-weight: 900;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.value,
.value-small { color: var(--color-text); font-weight: 900; }
.value { font-size: 1.55rem; }

.section-toolbar {
  position: sticky;
  top: calc(var(--header-height) + var(--space-2));
  z-index: 40;
  margin-bottom: var(--space-6);
  padding: var(--space-3);
  background: var(--color-bg);
  background: color-mix(in srgb, var(--color-bg) 90%, transparent);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}
.review-banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  margin-bottom: var(--space-5);
  padding: var(--space-5) var(--space-6);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-warning);
  border-radius: var(--radius-lg);
  background: var(--color-bg);
  background: linear-gradient(135deg, var(--color-bg), var(--color-warning-soft));
  box-shadow: var(--shadow-sm);
}
.review-banner .subtitle {
  margin-top: var(--space-1);
  margin-bottom: 0;
}
.toolbar-row {
  display: grid;
  grid-template-columns: minmax(220px, 1fr) auto auto auto auto auto auto;
  gap: var(--space-2);
  align-items: center;
}
.toolbar-row--search {
  grid-template-columns: minmax(220px, 1fr) auto;
}
.toolbar-row--advanced {
  margin-top: var(--space-3);
}
.toolbar-details {
  margin-top: var(--space-3);
}
.toolbar-details summary {
  cursor: pointer;
  color: var(--color-text-muted);
  font-size: 0.84rem;
  font-weight: 850;
}
.toolbar-details summary:hover {
  color: var(--color-text);
}
.toolbar-details summary:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--color-primary) 32%, transparent);
  outline-offset: 3px;
  border-radius: var(--radius-md);
  color: var(--color-text);
}
.toolbar-search,
.toolbar-select,
.segmented-button,
.icon-button {
  min-height: 36px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  background: var(--color-bg);
  color: var(--color-text);
  font: inherit;
}
.toolbar-search:focus-visible,
.toolbar-select:focus-visible,
.segmented-button:focus-visible,
.icon-button:focus-visible {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-primary) 26%, transparent);
}
.toolbar-search {
  min-width: 0;
  padding: 0 var(--space-4);
}
.toolbar-select { padding: 0 var(--space-3); }
.segmented-button,
.icon-button {
  padding: 0 var(--space-3);
  font-weight: 850;
  cursor: pointer;
}
.toolbar-search:disabled,
.toolbar-select:disabled,
.segmented-button:disabled,
.icon-button:disabled {
  border-color: var(--color-border);
  background: var(--color-bg-subtle);
  color: var(--color-text-muted);
  cursor: not-allowed;
  opacity: 0.72;
  transform: none;
}
.segmented-button:disabled:hover,
.icon-button:disabled:hover {
  border-color: var(--color-border);
  background: var(--color-bg-subtle);
  transform: none;
}
.segmented-button.active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-bg-page);
}
.reveal-all-button {
  min-width: 210px;
  background: var(--color-warning-soft);
  border-color: color-mix(in srgb, var(--color-warning) 62%, var(--color-border));
}
.reveal-all-button.active {
  background: var(--color-primary);
  border-color: var(--color-primary);
}
.toolbar-divider {
  width: 1px;
  height: 28px;
  background: var(--color-border);
}
.toolbar-meta {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-3);
  margin-top: var(--space-2);
  color: var(--color-text-muted);
  font-size: 0.82rem;
}
.shortcuts-wrap { position: relative; }
.shortcuts-popover {
  position: absolute;
  right: 0;
  top: calc(100% + var(--space-2));
  width: 220px;
  padding: var(--space-3);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  color: var(--color-text-muted);
  font-size: 0.84rem;
}
.shortcuts-popover[hidden] { display: none; }
.shortcuts-popover kbd {
  padding: 0 var(--space-2);
  border-radius: var(--radius-sm);
  background: var(--color-bg-subtle);
  border: 1px solid var(--color-border);
  color: var(--color-text);
  font-family: var(--font-mono);
}

.questions-list {
  display: grid;
  gap: var(--space-5);
  max-width: 880px;
}
.question {
  position: relative;
  padding: var(--space-6);
  border-top: 3px solid color-mix(in srgb, var(--color-primary) 55%, var(--color-border));
  border-radius: var(--radius-lg);
  transition: border-color var(--t-base), box-shadow var(--t-base), transform var(--t-base);
}
.question:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}
.question.is-hidden { display: none; }
.question-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}
.question-meta {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
}
.question-ref-with-indicator {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
}
.question-actions {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  flex-shrink: 0;
}
.question-number {
  padding: var(--space-1) var(--space-2);
  background: var(--color-bg-subtle);
  border-color: var(--color-border);
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 900;
}
.question-topic {
  color: var(--color-text-muted);
  font-size: 0.68rem;
  font-weight: 950;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.type-badge.type-multiple_choice {
  background: var(--color-primary-soft);
  border-color: color-mix(in srgb, var(--color-primary) 30%, var(--color-border));
  color: var(--color-primary);
}
.type-badge.type-fill_in {
  background: var(--color-module-4-soft);
  border-color: color-mix(in srgb, var(--color-module-4) 30%, var(--color-border));
  color: var(--color-module-4);
}
.type-badge.type-true_false {
  background: var(--color-success-soft);
  border-color: color-mix(in srgb, var(--color-success) 34%, var(--color-border));
  color: var(--color-success);
}
.diff-easy {
  background: var(--color-success-soft);
  border-color: color-mix(in srgb, var(--color-success) 34%, var(--color-border));
  color: var(--color-success);
}
.diff-medium {
  background: var(--color-warning-soft);
  border-color: color-mix(in srgb, var(--color-warning) 40%, var(--color-border));
  color: var(--color-warning);
}
.diff-hard {
  background: var(--color-danger-soft);
  border-color: color-mix(in srgb, var(--color-danger) 38%, var(--color-border));
  color: var(--color-danger);
}
.diff-unknown {
  background: var(--color-bg-subtle);
  border-color: var(--color-border);
  color: var(--color-text-muted);
}

.bookmark-button,
.copy-question-button {
  min-height: 34px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--color-border);
  background: var(--color-bg-subtle);
  color: var(--color-text-subtle);
  font: inherit;
  font-weight: 850;
  cursor: pointer;
}
.bookmark-button {
  min-width: 34px;
  padding: 0;
}
.copy-question-button {
  min-width: 86px;
  padding: 0 var(--space-3);
  color: var(--color-text);
}
.copy-question-button:hover,
.bookmark-button:hover {
  border-color: var(--color-border-strong);
  background: var(--color-primary-soft);
}
.copy-question-button:active,
.bookmark-button:active {
  transform: translateY(0);
}
.copy-question-button:focus-visible,
.bookmark-button:focus-visible {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-primary) 26%, transparent);
}
.bookmark-button.active {
  background: var(--color-warning-soft);
  border-color: var(--color-warning);
  color: var(--color-warning);
}
.question .prompt {
  margin: 0 0 var(--space-5);
  color: var(--color-text);
  font-weight: 500;
  line-height: 1.75;
  font-size: 1.02rem;
}
.question-media,
.task-media,
.question-visual-assets,
.question figure,
.question-card figure,
.dzi-task-card figure,
.practical-task-card figure {
  display: grid;
  gap: var(--space-2);
  margin: var(--space-4) 0;
}
.question-visual-assets {
  max-width: 860px;
}
.question-visual {
  min-width: 0;
}
.question img,
.question-card img,
.quiz-card img,
.dzi-task-card img,
.practical-task-card img,
.question-media img,
.task-media img {
  display: block;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-bg);
  box-shadow: var(--shadow-sm);
}
.question figcaption,
.question-card figcaption,
.dzi-task-card figcaption,
.practical-task-card figcaption,
.question-media-caption,
.task-media-caption {
  color: var(--color-text-muted);
  font-size: 0.84rem;
  font-weight: 700;
  line-height: 1.45;
}
.options-list {
  display: grid;
  gap: var(--space-3);
  list-style: none;
  padding: 0;
  margin: 0;
}
.answer-details {
  margin-top: var(--space-4);
}
.answer-details summary {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  padding: 0 var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  background: var(--color-bg);
  color: var(--color-text);
  font-weight: 850;
  cursor: pointer;
  transition: background var(--t-base), border-color var(--t-base), color var(--t-base);
}
.answer-details summary:hover {
  border-color: var(--color-border-strong);
  background: var(--color-bg-subtle);
}
.answer-details summary:active {
  background: color-mix(in srgb, var(--color-primary-soft) 58%, var(--color-bg));
}
.answer-details[open] summary {
  margin-bottom: var(--space-3);
  background: var(--color-primary-soft);
  border-color: color-mix(in srgb, var(--color-primary) 62%, var(--color-border));
  color: var(--color-primary);
}
.answer-details::details-content {
  block-size: 0;
  overflow: hidden;
  opacity: 0;
  transition: block-size var(--t-slow), opacity var(--t-base);
  transition-behavior: allow-discrete;
}
.answer-details[open]::details-content {
  block-size: auto;
  opacity: 1;
}
.option-row {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr) auto;
  gap: var(--space-3);
  align-items: flex-start;
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--color-border);
  border-left: 3px solid transparent;
  border-radius: var(--radius-lg);
  background: var(--color-bg-subtle);
  color: var(--color-text);
  transition: background var(--t-fast), border-color var(--t-fast), transform var(--t-fast);
}
.option-row:hover {
  border-color: var(--color-border-strong);
  transform: translateY(-1px);
}
.section-readonly .option-row {
  cursor: default;
  box-shadow: none;
}
.section-readonly .option-row:hover {
  border-color: var(--color-border);
  transform: none;
}
.section-readonly .option-row.correct:hover {
  border-color: color-mix(in srgb, var(--color-success) 70%, var(--color-border));
}
.option-letter {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: var(--radius-md);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  font-weight: 900;
  line-height: 1;
}
.option-text {
  min-width: 0;
  line-height: 1.58;
}
.option-status {
  align-self: center;
  padding: 2px var(--space-2);
  border-radius: var(--radius-pill);
  background: var(--color-bg);
  border: 1px solid var(--color-success);
  color: var(--color-success);
  font-size: 0.72rem;
  font-weight: 850;
  text-transform: lowercase;
  white-space: nowrap;
}
.option-row.correct {
  background: var(--color-success-soft);
  border-color: color-mix(in srgb, var(--color-success) 70%, var(--color-border));
  border-left-color: var(--color-success);
}
.question.hide-correct .option-row.correct {
  background: var(--color-bg-subtle);
  border-color: var(--color-border);
  border-left-color: transparent;
}
.question.hide-correct .option-row.correct .option-letter {
  background: var(--color-bg);
  border-color: var(--color-border);
  color: var(--color-text-muted);
}
.question.hide-correct .option-row.correct .option-status {
  display: none;
}
.open-question-note {
  display: inline-flex;
  padding: var(--space-2) var(--space-3);
  border: 1px dashed var(--color-border-strong);
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  background: var(--color-bg-subtle);
}

.warning,
.success,
.error {
  display: block;
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-4);
  margin-bottom: var(--space-4);
  border: 1px solid var(--color-border);
  border-left-width: 4px;
  font-weight: 750;
  line-height: 1.55;
}
.warning {
  background: var(--color-warning-soft);
  border-color: color-mix(in srgb, var(--color-warning) 72%, var(--color-border));
  color: var(--color-warning);
}
.success {
  background: var(--color-success-soft);
  border-color: color-mix(in srgb, var(--color-success) 72%, var(--color-border));
  color: var(--color-success);
}
.error {
  background: var(--color-danger-soft);
  border-color: color-mix(in srgb, var(--color-danger) 78%, var(--color-border));
  color: var(--color-danger);
}
.warning p,
.success p,
.error p {
  margin: var(--space-2) 0 0;
}
.warning p:first-child,
.success p:first-child,
.error p:first-child {
  margin-top: 0;
}

.warning--spaced,
.message--spaced { margin-top: var(--space-4); }
.form-message,
.login-message {
  max-width: 720px;
}
.login-message {
  margin-bottom: var(--space-4);
}
.notice-list {
  margin: var(--space-3) 0 0;
  padding-left: var(--space-5);
}
.notice-list li + li {
  margin-top: var(--space-1);
}

.quiz-meta--center { justify-content: center; }

.rule {
  border: 0;
  border-top: 1px solid var(--color-border);
  margin: var(--space-5) 0;
}

form label {
  display: block;
  margin: var(--space-3) 0 var(--space-1);
  font-weight: 850;
}
input,
select {
  width: 100%;
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-md);
  background: var(--color-bg);
  color: var(--color-text);
  font: inherit;
  transition: border-color var(--t-base), box-shadow var(--t-base);
}
input:disabled,
select:disabled,
textarea:disabled,
input[readonly],
textarea[readonly] {
  border-color: var(--color-border);
  background: color-mix(in srgb, var(--color-bg-subtle) 76%, var(--color-bg));
  color: var(--color-text-muted);
  cursor: not-allowed;
  box-shadow: none;
}
input[readonly],
textarea[readonly] {
  cursor: text;
}
input::placeholder,
textarea::placeholder {
  color: var(--color-text-subtle);
  opacity: 1;
}
fieldset:disabled {
  border-color: var(--color-border);
  background: color-mix(in srgb, var(--color-bg-subtle) 54%, var(--color-bg));
  color: var(--color-text-muted);
}
fieldset:disabled label,
fieldset:disabled .muted,
fieldset:disabled .help {
  color: var(--color-text-muted);
}
input:not([type="radio"]):not([type="checkbox"]):focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-primary) 26%, transparent);
}
input[type="radio"]:focus-visible,
input[type="checkbox"]:focus-visible,
input[type="file"]:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--color-primary) 34%, transparent);
  outline-offset: 3px;
}

.login-hero,
.login-card,
.login-message {
  max-width: 560px;
  margin-left: auto;
  margin-right: auto;
}
.login-hero {
  padding: var(--space-6);
  text-align: left;
}
.login-hero h1 {
  font-size: clamp(2rem, 4vw, 2.8rem);
}
.login-card {
  display: grid;
  gap: var(--space-3);
  padding: var(--space-6);
}
.login-card label {
  margin: 0;
  color: var(--color-text-muted);
  font-size: 0.82rem;
  font-weight: 850;
}
.login-card input {
  min-height: 46px;
}
.login-card button {
  width: 100%;
  min-height: 44px;
  margin-top: var(--space-2);
}

table { width: 100%; border-collapse: collapse; }
th, td {
  padding: var(--space-3);
  border-bottom: 1px solid var(--color-border);
  text-align: left;
  vertical-align: top;
  overflow-wrap: anywhere;
}
th {
  background: var(--color-bg-subtle);
  color: var(--color-text-muted);
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.wrap-cell { overflow-wrap: anywhere; word-break: break-word; }
.open-answer-review-form {
  min-width: 220px;
}
.open-answer-review-form textarea {
  width: 100%;
  min-height: 4.5rem;
  resize: vertical;
}
.open-answer-review-form input,
.open-answer-review-form select,
.open-answer-review-form textarea {
  max-width: 100%;
}

.quiz-hero {
  background: var(--color-bg);
  background: linear-gradient(135deg, var(--color-bg), var(--color-primary-soft));
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  margin-bottom: var(--space-5);
  box-shadow: var(--shadow-sm);
}
.quiz-meta,
.practice-actions { display: flex; gap: var(--space-2); flex-wrap: wrap; margin-top: var(--space-3); }
.quiz-start-summary {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: var(--space-3);
  max-width: 720px;
  margin-top: var(--space-5);
}
.quiz-start-summary-item {
  padding: var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg);
  background: color-mix(in srgb, var(--color-bg) 72%, var(--color-primary-soft));
}
.quiz-start-summary-item strong {
  display: block;
  margin-top: var(--space-1);
  color: var(--color-text);
  font-size: 1.08rem;
  line-height: 1.2;
}
.quiz-start-summary-item .pill {
  margin-top: var(--space-2);
  justify-content: flex-start;
}
.quiz-mixed-hint,
.quiz-mixed-banner {
  line-height: 1.6;
}
.quiz-mixed-hint {
  max-width: 840px;
  margin: var(--space-4) 0 0;
  padding: var(--space-3) var(--space-4);
  border: 1px solid color-mix(in srgb, var(--color-primary) 36%, var(--color-border));
  border-radius: var(--radius-md);
  background: var(--color-bg);
  background: color-mix(in srgb, var(--color-primary-soft) 48%, var(--color-bg));
  color: var(--color-text-muted);
}
.quiz-start-card {
  display: grid;
  gap: var(--space-3);
  max-width: 560px;
}
.student-assignment-card {
  border-radius: var(--radius-lg);
}
.quiz-start-card label {
  margin: 0;
  font-weight: 850;
}
.quiz-start-card .help {
  margin: 0;
  line-height: 1.55;
}
.quiz-start-card button {
  justify-self: start;
  min-height: 46px;
  margin-top: var(--space-2);
  padding-inline: var(--space-5);
}
.quiz-attempt-form {
  display: grid;
  gap: var(--space-4);
}
.quiz-submit-bar {
  display: flex;
  justify-content: flex-end;
  padding-top: var(--space-2);
}
.quiz-submit-bar button,
.quiz-attempt-form > button[type="submit"] {
  justify-self: start;
  min-height: 46px;
  padding-inline: var(--space-5);
}
.timer-panel {
  display: grid;
  justify-items: end;
  gap: var(--space-2);
  max-width: min(100%, 360px);
}
.timer {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  background: var(--color-warning-soft);
  color: var(--color-warning);
  border: 1px solid color-mix(in srgb, var(--color-warning) 70%, var(--color-border));
  border-radius: var(--radius-pill);
  font-weight: 800;
}
.timer-warning {
  margin: 0;
  padding: var(--space-2) var(--space-3);
  border: 1px solid color-mix(in srgb, var(--color-warning) 70%, var(--color-border));
  border-radius: var(--radius-md);
  background: var(--color-warning-soft);
  color: var(--color-warning);
  font-size: 0.92rem;
  font-weight: 850;
  line-height: 1.25;
  text-align: right;
}
.timer-warning.is-urgent {
  border-color: color-mix(in srgb, var(--color-danger) 82%, var(--color-border));
  background: var(--color-danger-soft);
  color: var(--color-danger);
}
.result-summary { text-align: center; }
.result-score-card {
  display: grid;
  justify-items: center;
  gap: var(--space-1);
  max-width: 360px;
  margin: var(--space-5) auto 0;
  padding: var(--space-6);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-bg-subtle);
  box-shadow: var(--shadow-sm);
}
.result-score-card.is-complete {
  border-color: color-mix(in srgb, var(--color-success) 70%, var(--color-border));
  background: var(--color-success-soft);
}
.result-score-card.needs-review {
  border-color: color-mix(in srgb, var(--color-warning) 55%, var(--color-border));
}
.result-score-label {
  color: var(--color-text-muted);
  font-size: 0.76rem;
  font-weight: 900;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.result-score { font-size: clamp(2.5rem, 8vw, 3.25rem); font-weight: 850; line-height: 1; }
.result-score-note {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  font-weight: 700;
}
.result-meta {
  justify-content: center;
}
.result-next-steps {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: var(--space-4);
  max-width: 820px;
  margin: var(--space-5) auto 0;
  padding: var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-bg);
  background: color-mix(in srgb, var(--color-bg) 72%, var(--color-primary-soft));
  text-align: left;
}
.result-next-steps h2 {
  margin-bottom: var(--space-1);
  font-size: 1.08rem;
}
.result-next-steps p {
  margin: 0;
}
.result-next-steps .result-actions {
  margin-top: 0;
  justify-content: flex-end;
}
.difficulty-breakdown {
  display: grid;
  gap: var(--space-3);
}
.difficulty-breakdown--compact {
  margin-top: var(--space-4);
}
.difficulty-breakdown--compact h3 {
  margin: 0;
  font-size: 1rem;
}
.difficulty-breakdown-grid {
  display: grid;
  gap: var(--space-3);
}
.difficulty-breakdown-row {
  display: grid;
  grid-template-columns: minmax(160px, 1fr) minmax(120px, 2fr) auto;
  align-items: center;
  gap: var(--space-3);
}
.difficulty-breakdown-label {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
}
.difficulty-breakdown-bar {
  height: 10px;
  overflow: hidden;
  border-radius: var(--radius-pill);
  background: var(--color-bg-subtle);
  border: 1px solid var(--color-border);
}
.difficulty-breakdown-bar span {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--color-danger), var(--color-warning), var(--color-success));
}
.answer-line {
  padding: var(--space-3);
  border-radius: var(--radius-md);
  background: var(--color-bg-subtle);
  margin: var(--space-2) 0;
}
.quiz-card,
.question-card {
  overflow-wrap: anywhere;
}
.quiz-card {
  padding: var(--space-5);
}
.quiz-card.is-answered {
  border-color: color-mix(in srgb, var(--color-success) 48%, var(--color-border));
  border-left: 4px solid var(--color-success);
}
.quiz-card-header {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
  margin-bottom: var(--space-3);
}
.quiz-question-title {
  margin: 0;
}
.quiz-question-total {
  color: var(--color-text-muted);
  font-size: 0.86rem;
  font-weight: 850;
}
.quiz-card > p:not(.muted) {
  max-width: 860px;
  font-size: 1.04rem;
  line-height: 1.7;
}

/*
 * Quiz attempt + result: full-width card per option, left-aligned.
 *
 * .quiz-option-card        — used as a <label> on the attempt page
 * .result-option-card      — used as a <div> on the result page
 *
 * Both share a 3-column grid: radio | letter | text (+ optional tag).
 */
.quiz-options {
  display: grid;
  gap: var(--space-2);
  margin-top: var(--space-4);
}

.quiz-option-card {
  display: grid;
  grid-template-columns: 1rem 34px minmax(0, 1fr);
  gap: var(--space-3);
  align-items: start;
  margin: 0;
  padding: var(--space-4) var(--space-5);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg);
  color: var(--color-text);
  cursor: pointer;
  font-weight: 500;
  transition: border-color var(--t-base), background var(--t-base), box-shadow var(--t-base), transform var(--t-base);
}
form .quiz-option-card {
  display: grid;
  margin: 0;
  font-weight: 500;
}
.quiz-option-card:hover {
  border-color: color-mix(in srgb, var(--color-primary) 60%, var(--color-border));
  background: color-mix(in srgb, var(--color-primary-soft) 34%, var(--color-bg-subtle));
  transform: translateY(-1px);
}
.quiz-option-card:active {
  transform: translateY(0);
  box-shadow: inset 3px 0 0 color-mix(in srgb, var(--color-primary) 62%, var(--color-border));
}
.quiz-option-card:focus-within {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-soft);
}
.quiz-option-card input[type="radio"]:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
}
.quiz-option-card input[type="radio"] {
  width: 1rem;
  margin: 0.38rem 0 0;
  accent-color: var(--color-primary);
}
.quiz-option-card.is-selected {
  border-color: var(--color-primary);
  background: var(--color-primary-soft);
  box-shadow: inset 3px 0 0 var(--color-primary);
}
.quiz-option-card.is-selected .quiz-option-letter {
  border-color: var(--color-primary);
  background: var(--color-primary);
  color: var(--color-bg-page);
}

.quiz-option-letter {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 32px;
  min-height: 32px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-mono);
  font-weight: 900;
  line-height: 1;
}
.quiz-option-text {
  min-width: 0;
  line-height: 1.6;
}
.quiz-open-answers {
  display: grid;
  gap: var(--space-3);
  margin-top: var(--space-4);
}
.quiz-open-answer {
  display: grid;
  gap: var(--space-2);
  margin: 0;
  font-weight: 800;
}
.quiz-open-answer input {
  min-height: 44px;
}

/*
 * Result page: same 3-col grid, no radio. Add a trailing tag column.
 */
.quiz-options--readonly {
  margin-top: var(--space-3);
}

.result-option-card {
  display: grid;
  grid-template-columns: 32px minmax(0, 1fr) auto;
  gap: var(--space-3);
  align-items: start;
  padding: var(--space-4) var(--space-5);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg);
  color: var(--color-text);
  transition: border-color var(--t-base), box-shadow var(--t-base);
}
.result-option-card:hover {
  border-color: var(--color-border-strong);
  box-shadow: var(--shadow-sm);
}
.result-option-card.is-correct {
  border-color: color-mix(in srgb, var(--color-success) 78%, var(--color-border));
  background: var(--color-success-soft);
}
.result-option-card.is-wrong-chosen {
  border-color: color-mix(in srgb, var(--color-danger) 82%, var(--color-border));
  background: var(--color-danger-soft);
}
.result-option-card.is-correct .quiz-option-letter {
  border-color: var(--color-success);
  color: var(--color-success);
}
.result-option-card.is-wrong-chosen .quiz-option-letter {
  border-color: var(--color-danger);
  color: var(--color-danger);
}
.result-option-tag {
  align-self: center;
  padding: 2px var(--space-2);
  border-radius: var(--radius-pill);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: lowercase;
  letter-spacing: 0.02em;
  white-space: nowrap;
}
.result-option-card.is-correct .result-option-tag {
  border-color: var(--color-success);
  color: var(--color-success);
}
.result-option-card.is-wrong-chosen .result-option-tag {
  border-color: var(--color-danger);
  color: var(--color-danger);
}
.answer-note {
  display: grid;
  gap: var(--space-1);
  margin: var(--space-3) 0 0;
  padding: var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg-subtle);
  color: var(--color-text-muted);
  font-weight: 700;
  line-height: 1.55;
}
.answer-summary-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-3);
  margin: var(--space-4) 0;
}
.answer-summary-grid .answer-note {
  margin: 0;
}
.answer-note-label {
  font-size: 0.72rem;
  font-weight: 900;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.answer-note--correct {
  border-color: color-mix(in srgb, var(--color-success) 76%, var(--color-border));
  background: var(--color-success-soft);
  color: var(--color-success);
}
.answer-note--wrong {
  border-color: color-mix(in srgb, var(--color-danger) 82%, var(--color-border));
  background: var(--color-danger-soft);
  color: var(--color-danger);
}
.answer-note--unanswered {
  border-color: color-mix(in srgb, var(--color-warning) 70%, var(--color-border));
  background: var(--color-warning-soft);
  color: var(--color-warning);
}

/*
 * Result-page header row: question title + status pill.
 */
.result-question-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-3);
}
.result-actions {
  margin-top: var(--space-5);
}
.status-pill {
  padding: var(--space-1) var(--space-3);
  border: 1px solid var(--color-border);
  font-size: 0.78rem;
  font-weight: 850;
}
.status-pill--correct {
  background: var(--color-success-soft);
  border-color: color-mix(in srgb, var(--color-success) 56%, var(--color-border));
  color: var(--color-success);
}
.status-pill--wrong {
  background: var(--color-danger-soft);
  border-color: color-mix(in srgb, var(--color-danger) 60%, var(--color-border));
  color: var(--color-danger);
}

/*
 * Teacher-page share link: read-only input + copy button on one row.
 * Stays calm: primary button, not warning amber.
 */
.share-box {
  margin-top: var(--space-4);
}
.share-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--space-2);
  align-items: center;
  margin-top: var(--space-2);
}
.share-input {
  font-family: var(--font-mono);
  font-size: 0.86rem;
}

pre {
  white-space: pre-wrap;
  overflow: auto;
  padding: var(--space-4);
  border-radius: var(--radius-lg);
  background: var(--color-text);
  color: var(--color-bg);
}
code {
  padding: 0 var(--space-1);
  border-radius: var(--radius-sm);
  background: var(--color-bg-subtle);
}

.empty-state {
  color: var(--color-text-muted);
  padding: var(--space-4);
  border: 1px dashed var(--color-border-strong);
  border-radius: var(--radius-md);
  background: var(--color-bg-subtle);
  line-height: 1.6;
}
.empty-actions {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
  margin-top: calc(-1 * var(--space-2));
}
.empty-actions .button {
  min-height: 36px;
}

.site-footer {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-8);
  padding: var(--space-5) var(--space-3) var(--space-4);
  border-top: 1px solid color-mix(in srgb, var(--color-border) 76%, transparent);
  color: var(--color-text-muted);
  font-size: 0.76rem;
  line-height: 1.5;
  text-align: center;
}
.site-footer > * + *::before {
  content: "·";
  margin-right: var(--space-2);
  color: var(--color-border-strong);
}
.site-footer a {
  color: var(--color-text-muted);
  font-weight: 850;
}
.site-footer a:hover {
  color: var(--color-primary);
  text-decoration: none;
}

@media print {
  @page {
    margin: 14mm;
  }

  html {
    scroll-padding-top: 0;
  }

  body {
    background: #fff;
    color: #111;
    font-size: 11pt;
    line-height: 1.4;
  }

  .app-shell {
    max-width: none;
    padding: 0;
  }

  .top-nav,
  .breadcrumb,
  .site-footer,
  .header-actions,
  .actions,
  .empty-actions,
  .question-actions,
  .section-toolbar,
  .question-toolbar,
  .toolbar-row,
  .toolbar-details,
  .quiz-progress,
  .quiz-submit-bar,
  .teacher-filter-card,
  .timer-panel,
  .result-actions,
  .practice-actions,
  .button,
  button,
  .link-button {
    display: none !important;
  }

  a {
    color: #111;
    text-decoration: none;
  }

  .hero,
  .quiz-hero,
  .page-header,
  .card,
  .panel,
  .module-card,
  .question,
  .quiz-card,
  .question-card,
  .result-score-card,
  .result-next-steps,
  .difficulty-breakdown,
  .quiz-start-summary-item,
  .teacher-list-card,
  .teacher-summary-card,
  .teacher-table-card,
  .teacher-open-answers-card,
  .dzi-task-card,
  .practical-task-card,
  .home-dzi-section,
  .home-subject-section,
  .home-dzi-card,
  .home-subject-card {
    break-inside: avoid;
    page-break-inside: avoid;
    border-color: #bbb;
    box-shadow: none;
    background: #fff;
    -webkit-backdrop-filter: none;
    backdrop-filter: none;
  }

  .hero,
  .quiz-hero,
  .page-header {
    padding: 0 0 10pt;
    margin-bottom: 14pt;
    border-width: 0 0 1px;
    border-radius: 0;
  }

  h1 {
    font-size: 22pt;
    letter-spacing: 0;
  }

  h2 {
    font-size: 15pt;
  }

  .subtitle,
  .muted,
  .help,
  .eyebrow {
    color: #444;
  }

  .pill,
  .badge,
  .section-type-badge {
    border-color: #bbb;
    background: #fff;
    color: #222;
  }

  .questions-list,
  .assignment-groups,
  .quiz-options,
  .quiz-options--readonly {
    gap: 10pt;
  }

  .question,
  .quiz-card,
  .question-card {
    padding: 12pt;
  }

  .quiz-option-card,
  .result-option-card,
  .option-row {
    break-inside: avoid;
    page-break-inside: avoid;
    background: #fff;
    border-color: #bbb;
    transform: none;
  }

  .table-wrap {
    overflow: visible;
    background: none;
  }

  table,
  .teacher-table,
  .teacher-table--dense,
  .table-wrap--wide table {
    min-width: 0;
    width: 100%;
    font-size: 9pt;
  }

  th,
  td {
    padding: 5pt;
    border-color: #bbb;
  }

  tr,
  th,
  td {
    break-inside: avoid;
    page-break-inside: avoid;
  }

  th {
    position: static !important;
    background: #f3f3f3;
    color: #222;
  }

  pre,
  code {
    border: 1px solid #bbb;
    background: #fff;
    color: #111;
  }
}

@media (max-width: 768px) {
  .app-shell { padding: var(--space-3); }
  .top-nav { border-radius: var(--radius-lg); }
  .top-nav-row {
    grid-template-columns: auto 1fr auto;
    gap: var(--space-2);
  }
  .brand {
    min-width: 42px;
  }
  .brand-logo-full {
    display: none;
  }
  .brand-logo-icon {
    display: block;
  }
  .nav-links {
    min-width: 0;
    justify-content: flex-start;
  }
  .nav-menu-panel {
    position: fixed;
    top: calc(var(--space-3) + var(--header-height) + var(--space-2));
    left: var(--space-3);
    right: var(--space-3);
    width: auto;
    min-width: 0;
  }
  .profile-switch {
    display: none;
  }
  .mobile-profile-menu {
    display: block;
    position: relative;
  }
  .pinned-grid { grid-template-columns: 1fr; }
  .mode-grid {
    grid-template-columns: 1fr;
    gap: var(--space-3);
    margin-bottom: var(--space-6);
  }
  .mode-card {
    min-height: 0;
    padding: var(--space-4);
  }
  .mode-action {
    padding-top: var(--space-3);
  }
  .home-hero {
    padding: var(--space-5) var(--space-4);
  }
  .home-hero h1 {
    font-size: 2rem;
    line-height: 1.08;
  }
  .home-hero .subtitle {
    font-size: 0.98rem;
  }
  .home-hero-stats {
    gap: var(--space-2);
    margin-top: var(--space-4);
  }
  .home-search {
    margin-top: var(--space-4);
  }
  .home-search-input {
    min-height: 46px;
    border-radius: var(--radius-lg);
    font-size: 1rem;
  }
  .home-dzi-card {
    grid-template-columns: 1fr;
    min-height: 0;
    padding: var(--space-4);
    border-left-width: 5px;
  }
  .home-dzi-section {
    padding: var(--space-4);
    margin-bottom: var(--space-6);
  }
  .home-dzi-title {
    font-size: 1.55rem;
  }
  .home-dzi-stats {
    flex-direction: column;
    gap: var(--space-1);
  }
  .home-dzi-icon { display: none; }
  .home-subject-section {
    padding: var(--space-4);
    margin-bottom: var(--space-6);
  }
  .home-subject-grid {
    grid-template-columns: 1fr;
    gap: var(--space-3);
  }
  .home-subject-card {
    min-height: 0;
    padding: var(--space-4);
  }
  .home-subject-title {
    font-size: 1.5rem;
  }
  .home-subject-stats {
    flex-direction: column;
    gap: var(--space-1);
  }
  .home-subject-class-links {
    padding-top: var(--space-3);
  }
  .physics-status-panel {
    grid-template-columns: 1fr;
  }
  .physics-soon {
    width: 100%;
    height: 44px;
  }
  .physics-class-card {
    min-height: 0;
  }
  .subject-status-panel {
    grid-template-columns: 1fr;
  }
  .subject-soon {
    width: 100%;
    min-height: 44px;
  }
  .subject-class-card {
    min-height: 0;
  }
  .open-question-panel {
    padding: var(--space-3);
  }
  .open-question-toggle {
    gap: var(--space-2);
  }
  .open-question-controls {
    grid-template-columns: 1fr;
  }
  .open-question-availability {
    border-left: 0;
    border-top: 3px solid var(--color-warning);
  }
  .practical-assignment-panel {
    padding: var(--space-3);
  }
  .practical-source-option {
    grid-template-columns: 1fr;
  }
  .practical-source-option .button {
    width: 100%;
  }
  .dzi-toolbar {
    align-items: stretch;
    flex-direction: column;
  }
  .dzi-start-meta {
    gap: var(--space-1);
  }
  .dzi-start-summary {
    grid-template-columns: 1fr;
    gap: var(--space-2);
  }
  .dzi-toolbar .button,
  .dzi-training-form button,
  .practical-upload-form button {
    width: 100%;
  }
  .dzi-source-grid {
    grid-template-columns: 1fr;
  }
  .dzi-task-card,
  .practical-task-card {
    padding: var(--space-4);
  }
  .practical-task-card {
    gap: var(--space-4);
  }
  .practical-task-header {
    gap: var(--space-3);
  }
  .practical-task-meta {
    justify-content: flex-start;
  }
  .practical-brief-block,
  .practical-step-card,
  .practical-resource-item,
  .practical-output-item {
    padding: var(--space-3);
  }
  .practical-resource-item {
    grid-template-columns: minmax(0, 1fr);
  }
  .practical-resource-action {
    grid-column: 1;
    grid-row: auto;
    justify-self: stretch;
  }
  .practical-resource-action .button {
    width: 100%;
  }
  .practical-step-card {
    grid-template-columns: 30px minmax(0, 1fr);
    gap: var(--space-2);
  }
  .question-media,
  .task-media,
  .question-visual-assets,
  .question figure,
  .question-card figure,
  .dzi-task-card figure,
  .practical-task-card figure {
    margin-block: var(--space-3);
  }
  .question img,
  .question-card img,
  .quiz-card img,
  .dzi-task-card img,
  .practical-task-card img,
  .question-media img,
  .task-media img {
    border-radius: var(--radius-md);
  }
  .practical-task-card .option-row {
    grid-template-columns: minmax(0, 1fr);
  }
  .practical-task-card .option-row .button {
    width: 100%;
  }
  .practical-upload-form {
    padding: var(--space-3);
  }
  .toolbar-row {
    grid-template-columns: 1fr auto auto;
  }
  .toolbar-row--search {
    grid-template-columns: 1fr;
  }
  .toolbar-search {
    grid-column: 1 / -1;
    width: 100%;
  }
  .toolbar-divider { display: none; }
  .toolbar-meta { justify-content: flex-start; flex-wrap: wrap; }
  .button-label { display: none; }
  .reveal-all-button {
    width: 100%;
    min-width: 0;
  }
  .reveal-all-button .button-label {
    display: inline;
  }
  .page-header,
  .section-heading,
  .question-toolbar {
    display: block;
  }
  .page-header {
    padding: var(--space-4);
  }
  .header-actions,
  .badges {
    justify-content: flex-start;
    margin-top: var(--space-3);
  }
  .timer-panel {
    justify-items: start;
    max-width: 100%;
    margin-top: var(--space-3);
  }
  .timer-warning {
    text-align: left;
  }
  .hero,
  .quiz-hero {
    padding: var(--space-5);
    margin-bottom: var(--space-5);
  }
  .quiz-start-card button,
  .quiz-submit-bar button,
  .quiz-attempt-form > button[type="submit"],
  .result-actions .button {
    width: 100%;
  }
  .student-assignment-hero .subtitle,
  .student-assignment-card .help {
    line-height: 1.65;
  }
  .student-assignment-card {
    max-width: none;
  }
  .result-next-steps {
    grid-template-columns: 1fr;
  }
  .result-next-steps .result-actions {
    justify-content: stretch;
  }
  .quiz-submit-bar {
    position: sticky;
    bottom: var(--space-3);
    z-index: 15;
    padding: var(--space-3);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    background: var(--color-bg);
    background: color-mix(in srgb, var(--color-bg) 92%, transparent);
    box-shadow: var(--shadow-md);
  }
  .card.quiz-card {
    padding: var(--space-4);
  }
  .quiz-option-card {
    grid-template-columns: 1rem 30px minmax(0, 1fr);
    gap: var(--space-2);
    padding: var(--space-3);
  }
  .result-option-card {
    grid-template-columns: 30px minmax(0, 1fr);
    gap: var(--space-2);
    padding: var(--space-3);
  }
  .result-option-tag {
    grid-column: 2;
    justify-self: start;
  }
  .result-question-header {
    align-items: flex-start;
    flex-direction: column;
    gap: var(--space-2);
  }
  .grade-card,
  .question,
  .card,
  .panel {
    padding: var(--space-5);
  }
  .grade-card {
    min-height: 164px;
  }
  .question-header {
    flex-direction: column;
  }
  .question-actions {
    width: 100%;
    justify-content: space-between;
  }
  .assignment-mini-card {
    grid-template-columns: 1fr;
  }
  .assignment-mini-meta {
    justify-items: start;
  }
  .dashboard-actions,
  .dashboard-action-group {
    width: 100%;
    justify-content: stretch;
  }
  .dashboard-actions .button {
    flex: 1 1 180px;
    justify-content: center;
  }
  .dashboard-action-group--primary .button {
    flex-basis: 100%;
  }
  .difficulty-breakdown-row {
    grid-template-columns: 1fr;
    gap: var(--space-2);
  }
  .teacher-list-card,
  .teacher-table-card,
  .teacher-open-answers-card {
    padding-left: var(--space-3);
    padding-right: var(--space-3);
  }
  .table-wrap {
    margin-inline: calc(-1 * var(--space-1));
    border-radius: var(--radius-sm);
  }
  .teacher-table {
    min-width: 720px;
  }
  .table-wrap--wide table,
  .teacher-table--dense {
    min-width: 1080px;
  }
  .teacher-table th,
  .teacher-table td {
    padding: var(--space-2);
    font-size: 0.88rem;
  }
  .teacher-table th {
    font-size: 0.7rem;
  }
  .teacher-table .links {
    flex-direction: column;
    align-items: stretch;
  }
  .teacher-table .links a,
  .teacher-table .link-button {
    width: 100%;
    justify-content: center;
    text-align: center;
  }
  .grade-grid,
  .cards,
  .questions-list {
    gap: var(--space-4);
  }
  .stat-row {
    gap: var(--space-2);
  }
  .stat-box {
    padding: var(--space-2);
  }
  .stat-number {
    font-size: 1.55rem;
  }
  .topic-list {
    grid-template-columns: 1fr;
  }
  .section-toolbar {
    position: static;
    top: auto;
  }
  .nav-links {
    -webkit-overflow-scrolling: touch;
    flex-wrap: nowrap;
  }
  .mode-actions .button {
    min-height: 40px;
    flex: 1 1 auto;
  }
}

.home-search {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-top: var(--space-5);
  max-width: 560px;
}
.home-search-label {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}
.home-search-input {
  width: 100%;
  min-height: 44px;
  padding: 0 var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  background: var(--color-bg);
  color: var(--color-text);
  font-size: 0.96rem;
  transition: border-color var(--t-base), box-shadow var(--t-base);
}
.home-search-input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-primary) 25%, transparent);
}
.home-search-empty {
  margin: 0;
  padding: var(--space-3) var(--space-4);
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg-subtle);
  color: var(--color-text-muted);
  font-size: 0.92rem;
}

/* Homepage content uses quieter material than the floating navigation. */
@media screen {
  @supports ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
    .home-hero {
      background: linear-gradient(
        135deg,
        color-mix(in srgb, var(--color-bg) 85%, transparent),
        color-mix(
          in srgb,
          var(--color-primary-soft) 24%,
          color-mix(in srgb, var(--color-bg) 83%, transparent)
        )
      );
      border-color: var(--glass-border);
      -webkit-backdrop-filter: var(--glass-major-filter);
      backdrop-filter: var(--glass-major-filter);
      box-shadow: var(--shadow-md), inset 0 1px 0 rgba(255, 239, 218, 0.1);
    }

    .home-hero-stats span,
    .home-section > .section-heading .pill,
    .home-search-input,
    .home-search-empty,
    .home-subject-class-links a {
      background: color-mix(in srgb, var(--color-bg-subtle) 84%, transparent);
      border-color: color-mix(in srgb, var(--color-border-strong) 48%, var(--color-border));
      box-shadow: inset 0 1px 0 rgba(255, 239, 218, 0.07), var(--shadow-sm);
    }

    .home-search-input:focus {
      box-shadow:
        0 0 0 3px color-mix(in srgb, var(--color-primary) 25%, transparent),
        inset 0 1px 0 rgba(255, 239, 218, 0.08);
    }

    .home-dzi-section,
    .home-subject-section {
      -webkit-backdrop-filter: var(--glass-panel-filter);
      backdrop-filter: var(--glass-panel-filter);
    }

    .home-dzi-section {
      background: linear-gradient(
        135deg,
        color-mix(
          in srgb,
          var(--color-accent-dzi-soft) 58%,
          color-mix(in srgb, var(--color-bg) 85%, transparent)
        ),
        color-mix(in srgb, var(--color-bg) 86%, transparent)
      );
      box-shadow: var(--shadow-md), inset 0 1px 0 rgba(255, 239, 218, 0.1);
    }

    .home-subject-section {
      background: linear-gradient(
        135deg,
        color-mix(in srgb, var(--color-bg) 86%, transparent),
        color-mix(
          in srgb,
          color-mix(in srgb, var(--color-bg-subtle) 86%, transparent) 56%,
          color-mix(in srgb, var(--color-bg) 84%, transparent)
        )
      );
      border-color: color-mix(in srgb, var(--color-border-strong) 60%, var(--color-border));
      box-shadow: var(--shadow-md), inset 0 1px 0 rgba(255, 239, 218, 0.09);
    }

    /* Nested homepage cards add alpha and edge light, never another blur root. */
    .home-dzi-card {
      background: linear-gradient(
        135deg,
        color-mix(in srgb, var(--color-bg) 92%, transparent),
        color-mix(
          in srgb,
          var(--color-accent-dzi-soft) 70%,
          color-mix(in srgb, var(--color-bg) 88%, transparent)
        )
      );
      box-shadow: var(--shadow-lg), inset 0 1px 0 rgba(255, 239, 218, 0.08);
    }

    .home-dzi-card:hover {
      background: linear-gradient(
        135deg,
        color-mix(in srgb, var(--color-bg) 94%, transparent),
        color-mix(
          in srgb,
          var(--color-accent-dzi-soft) 82%,
          color-mix(in srgb, var(--color-bg) 90%, transparent)
        )
      );
      box-shadow: var(--shadow-lg), inset 0 1px 0 rgba(255, 239, 218, 0.1);
    }

    .home-subject-card {
      background: linear-gradient(
        145deg,
        color-mix(in srgb, var(--color-bg) 91%, transparent),
        color-mix(
          in srgb,
          var(--color-bg-subtle) 58%,
          color-mix(in srgb, var(--color-bg) 87%, transparent)
        )
      );
      box-shadow: var(--shadow-sm), inset 0 1px 0 rgba(255, 239, 218, 0.07);
    }

    .home-subject-card:not(.mode-card--inactive):hover {
      background: linear-gradient(
        145deg,
        color-mix(in srgb, var(--color-bg) 93%, transparent),
        color-mix(
          in srgb,
          var(--color-primary-soft) 42%,
          color-mix(in srgb, var(--color-bg) 89%, transparent)
        )
      );
      box-shadow: var(--shadow-md), inset 0 1px 0 rgba(255, 239, 218, 0.09);
    }

    .home-subject-card.mode-card--inactive,
    .home-subject-card.mode-card--inactive:hover {
      background: color-mix(in srgb, var(--color-bg-subtle) 62%, var(--color-bg));
      box-shadow: var(--shadow-sm), inset 0 1px 0 rgba(255, 239, 218, 0.05);
    }
  }

  @media (prefers-reduced-transparency: reduce) {
    .home-hero,
    .home-dzi-section,
    .home-subject-section {
      -webkit-backdrop-filter: none;
      backdrop-filter: none;
    }

    .home-hero {
      background: linear-gradient(135deg, var(--color-bg), var(--color-primary-soft));
    }

    .home-hero-stats span,
    .home-section > .section-heading .pill,
    .home-search-empty,
    .home-subject-class-links a {
      background: var(--color-bg-subtle);
    }

    .home-search-input {
      background: var(--color-bg);
    }

    .home-dzi-section {
      background: linear-gradient(
        135deg,
        color-mix(in srgb, var(--color-accent-dzi-soft) 72%, var(--color-bg)),
        var(--color-bg)
      );
    }

    .home-subject-section {
      background: linear-gradient(
        135deg,
        var(--color-bg),
        color-mix(in srgb, var(--color-bg-subtle) 78%, var(--color-bg))
      );
    }

    .home-dzi-card,
    .home-dzi-card:hover {
      background: linear-gradient(
        135deg,
        var(--color-bg),
        color-mix(in srgb, var(--color-accent-dzi-soft) 86%, var(--color-bg))
      );
    }

    .home-subject-card {
      background: linear-gradient(
        145deg,
        var(--color-bg),
        color-mix(in srgb, var(--color-bg-subtle) 72%, var(--color-bg))
      );
    }

    .home-subject-card:not(.mode-card--inactive):hover {
      background: linear-gradient(
        145deg,
        var(--color-bg),
        color-mix(in srgb, var(--color-primary-soft) 48%, var(--color-bg))
      );
    }

    .home-subject-card.mode-card--inactive,
    .home-subject-card.mode-card--inactive:hover {
      background: color-mix(in srgb, var(--color-bg-subtle) 62%, var(--color-bg));
    }
  }
}

.is-search-hidden {
  display: none !important;
}

.home-section--topics {
  margin-top: var(--space-6);
}
.topic-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: var(--space-3);
}
.topic-list-item {
  display: flex;
}
.topic-list-link {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  width: 100%;
  padding: var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg);
  color: var(--color-text);
  text-decoration: none;
  transition: border-color var(--t-base), transform var(--t-base), box-shadow var(--t-base);
}
.topic-list-link:hover {
  text-decoration: none;
  transform: translateY(-1px);
  border-color: var(--color-border-strong);
  box-shadow: var(--shadow-sm);
}
.topic-list-link:active {
  transform: translateY(0);
  box-shadow: none;
}
.topic-list-grade {
  font-size: 0.74rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}
.topic-list-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-text);
}
.topic-list-module {
  font-size: 0.84rem;
  color: var(--color-text-muted);
}

.quiz-progress {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  position: sticky;
  top: calc(var(--header-height) + var(--space-4));
  z-index: 20;
  padding: var(--space-3) var(--space-4);
  margin-bottom: var(--space-4);
  border: 1px solid color-mix(in srgb, var(--color-primary) 24%, var(--color-border));
  border-radius: var(--radius-lg);
  background: var(--color-bg);
  background: color-mix(in srgb, var(--color-bg) 92%, transparent);
  box-shadow: var(--shadow-sm);
}
.quiz-progress-text {
  margin: 0;
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--color-text-muted);
}
.quiz-progress-text #quiz-progress-count {
  color: var(--color-text);
}
.quiz-progress-text #quiz-progress-total {
  color: var(--color-text);
}
.quiz-progress-bar {
  width: 100%;
  height: 10px;
  border: none;
  border-radius: var(--radius-pill);
  background: var(--color-bg);
  overflow: hidden;
  appearance: none;
  -webkit-appearance: none;
}
.quiz-progress-bar::-webkit-progress-bar {
  background: var(--color-bg);
  border-radius: var(--radius-pill);
}
.quiz-progress-bar::-webkit-progress-value {
  background: var(--color-primary);
  border-radius: var(--radius-pill);
  transition: width var(--t-base);
}
.quiz-progress-bar::-moz-progress-bar {
  background: var(--color-primary);
  border-radius: var(--radius-pill);
}

/* Student browsing surfaces use the approved content material hierarchy. */
@media screen {
  @supports ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
    .content-browse-page {
      --browse-panel-surface: color-mix(in srgb, var(--color-bg) 85%, transparent);
      --browse-card-surface: color-mix(in srgb, var(--color-bg) 91%, transparent);
      --browse-card-hover-surface: color-mix(in srgb, var(--color-bg) 94%, transparent);
      --browse-control-surface: color-mix(in srgb, var(--color-bg-subtle) 86%, transparent);
      --browse-control-soft-surface: color-mix(in srgb, var(--color-bg-subtle) 48%, transparent);
      --browse-material-edge: var(--glass-border);
    }

    /* Breadcrumbs remain secondary, with only a light material cue. */
    .content-browse-page .breadcrumb a {
      border: 1px solid color-mix(in srgb, var(--browse-material-edge) 55%, transparent);
      background: var(--browse-control-soft-surface);
      box-shadow: inset 0 1px 0 rgba(255, 239, 218, 0.05);
    }
    .content-browse-page .breadcrumb a:hover {
      border-color: var(--browse-material-edge);
      background: var(--browse-control-surface);
    }

    /* Heroes and independent outer panels carry the medium glass layer. */
    .content-browse-page .hero {
      background: linear-gradient(
        135deg,
        var(--browse-panel-surface),
        color-mix(in srgb, var(--color-primary-soft) 26%, var(--browse-panel-surface))
      );
      border-color: var(--browse-material-edge);
      -webkit-backdrop-filter: var(--glass-major-filter);
      backdrop-filter: var(--glass-major-filter);
      box-shadow: var(--shadow-md), inset 0 1px 0 rgba(255, 239, 218, 0.09);
    }
    .content-browse-page .subject-hero {
      border-color: color-mix(in srgb, var(--color-primary) 30%, var(--browse-material-edge));
    }
    .content-browse-page .subject-hero--placeholder {
      border-color: color-mix(in srgb, var(--color-success) 30%, var(--browse-material-edge));
      background: linear-gradient(
        135deg,
        var(--browse-panel-surface),
        color-mix(in srgb, var(--color-success-soft) 28%, var(--browse-panel-surface))
      );
    }

    .content-browse-page .module-card,
    .content-browse-page .subject-status-panel,
    .content-browse-page .review-banner {
      -webkit-backdrop-filter: var(--glass-panel-filter);
      backdrop-filter: var(--glass-panel-filter);
      box-shadow: var(--shadow-md), inset 0 1px 0 rgba(255, 239, 218, 0.08);
    }
    .content-browse-page .module-card {
      border-color: var(--browse-material-edge);
      border-top-color: var(--module-color, var(--color-primary));
      background: var(--browse-panel-surface);
    }
    .content-browse-page .module-titlebar {
      background: color-mix(
        in srgb,
        var(--module-color, var(--color-primary)) 9%,
        var(--browse-control-surface)
      );
      box-shadow: inset 0 1px 0 rgba(255, 239, 218, 0.05);
    }
    .content-browse-page .subject-status-panel {
      border-color: color-mix(in srgb, var(--color-success) 30%, var(--browse-material-edge));
      background: linear-gradient(
        135deg,
        var(--browse-panel-surface),
        color-mix(in srgb, var(--color-success-soft) 22%, var(--browse-panel-surface))
      );
    }
    .content-browse-page .review-banner {
      border-color: var(--browse-material-edge);
      border-left-color: var(--color-warning);
      background: linear-gradient(
        135deg,
        var(--browse-panel-surface),
        color-mix(in srgb, var(--color-warning-soft) 34%, var(--browse-panel-surface))
      );
    }

    /* The sticky browsing toolbar is an independent, lighter control layer. */
    .content-browse-page .section-toolbar {
      background: color-mix(in srgb, var(--color-bg) 88%, transparent);
      border-color: var(--browse-material-edge);
      -webkit-backdrop-filter: var(--glass-control-filter);
      backdrop-filter: var(--glass-control-filter);
      box-shadow: var(--shadow-sm), inset 0 1px 0 rgba(255, 239, 218, 0.07);
    }

    /* Nested cards use translucency and edge light without another blur root. */
    .content-browse-page .pinned-card,
    .content-browse-page .subject-class-card,
    .content-browse-page .subject-topic-group-card,
    .content-browse-page .subject-placeholder-card,
    .content-browse-page .section-readonly .question {
      background: var(--browse-card-surface);
      border-color: var(--browse-material-edge);
      box-shadow: var(--shadow-sm), inset 0 1px 0 rgba(255, 239, 218, 0.07);
    }
    .content-browse-page .pinned-card {
      border-left-color: var(--pin-color, var(--color-primary));
    }
    .content-browse-page .subject-class-card,
    .content-browse-page .subject-placeholder-card,
    .content-browse-page .subject-topic-group-card {
      border-top-color: color-mix(in srgb, var(--color-success) 68%, var(--color-primary));
    }
    .content-browse-page .subject-class-card {
      background: linear-gradient(
        145deg,
        var(--browse-card-surface),
        color-mix(in srgb, var(--color-success-soft) 34%, var(--browse-card-surface))
      );
    }
    .content-browse-page .subject-class-card--active {
      border-top-color: var(--color-primary);
      background: linear-gradient(
        145deg,
        var(--browse-card-surface),
        color-mix(in srgb, var(--color-primary-soft) 34%, var(--browse-card-surface))
      );
    }
    .content-browse-page .section-readonly .question {
      border-top-color: color-mix(in srgb, var(--color-primary) 55%, var(--browse-material-edge));
    }

    .content-browse-page .pinned-card:hover,
    .content-browse-page .subject-topic-group-card:hover {
      transform: translateY(-1px);
      background: linear-gradient(
        145deg,
        var(--browse-card-hover-surface),
        color-mix(in srgb, var(--color-primary-soft) 34%, var(--browse-card-hover-surface))
      );
      box-shadow: var(--shadow-md), inset 0 1px 0 rgba(255, 239, 218, 0.09);
    }
    .content-browse-page .subject-class-card:hover {
      transform: translateY(-1px);
      background: linear-gradient(
        145deg,
        var(--browse-card-hover-surface),
        color-mix(in srgb, var(--color-success-soft) 42%, var(--browse-card-hover-surface))
      );
      box-shadow: var(--shadow-md), inset 0 1px 0 rgba(255, 239, 218, 0.09);
    }
    .content-browse-page .subject-class-card--active:hover {
      background: linear-gradient(
        145deg,
        var(--browse-card-hover-surface),
        color-mix(in srgb, var(--color-primary-soft) 42%, var(--browse-card-hover-surface))
      );
    }
    .content-browse-page .section-readonly .question:hover {
      transform: translateY(-1px);
      border-color: var(--color-primary);
      box-shadow: var(--shadow-md), inset 0 1px 0 rgba(255, 239, 218, 0.09);
    }

    .content-browse-page .section-item {
      border-color: color-mix(in srgb, var(--browse-material-edge) 48%, transparent);
      background: var(--browse-control-soft-surface);
      box-shadow: inset 0 1px 0 rgba(255, 239, 218, 0.04);
    }
    .content-browse-page .section-item:hover {
      border-color: var(--browse-material-edge);
      border-left-color: var(--module-color, var(--color-primary));
      background: var(--browse-control-surface);
      box-shadow: var(--shadow-sm), inset 0 1px 0 rgba(255, 239, 218, 0.06);
    }

    .content-browse-page .count-pill,
    .content-browse-page .section-heading > .pill,
    .content-browse-page .question-toolbar > .pill {
      border-color: var(--browse-material-edge);
      background: var(--browse-control-surface);
      box-shadow: inset 0 1px 0 rgba(255, 239, 218, 0.06);
    }
    .content-browse-page .empty-state {
      border-color: var(--browse-material-edge);
      background: var(--browse-control-surface);
      box-shadow: inset 0 1px 0 rgba(255, 239, 218, 0.05);
    }

    @media (max-width: 768px) {
      .content-browse-page .section-toolbar {
        -webkit-backdrop-filter: none;
        backdrop-filter: none;
      }
    }
  }

  @media (prefers-reduced-transparency: reduce) {
    .content-browse-page {
      --browse-panel-surface: var(--color-bg);
      --browse-card-surface: var(--color-bg);
      --browse-card-hover-surface: var(--color-bg);
      --browse-control-surface: var(--color-bg-subtle);
      --browse-control-soft-surface: var(--color-bg-subtle);
    }

    .content-browse-page .hero,
    .content-browse-page .module-card,
    .content-browse-page .subject-status-panel,
    .content-browse-page .review-banner,
    .content-browse-page .section-toolbar {
      -webkit-backdrop-filter: none;
      backdrop-filter: none;
    }
  }
}

/* Student assessment keeps semantic answer states above the material layer. */
@media screen {
  @supports ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
    .student-assessment-page {
      --assessment-panel-surface: color-mix(in srgb, var(--color-bg) 85%, transparent);
      --assessment-question-surface: color-mix(in srgb, var(--color-bg) 87%, transparent);
      --assessment-card-surface: color-mix(in srgb, var(--color-bg) 91%, transparent);
      --assessment-card-hover-surface: color-mix(in srgb, var(--color-bg) 94%, transparent);
      --assessment-control-surface: color-mix(in srgb, var(--color-bg-subtle) 86%, transparent);
      --assessment-control-soft-surface: color-mix(in srgb, var(--color-bg-subtle) 54%, transparent);
    }

    .student-assessment-page .breadcrumb a {
      border: 1px solid color-mix(in srgb, var(--glass-border) 55%, transparent);
      background: var(--assessment-control-soft-surface);
      box-shadow: inset 0 1px 0 rgba(255, 239, 218, 0.05);
    }
    .student-assessment-page .breadcrumb a:hover {
      border-color: var(--glass-border);
      background: var(--assessment-control-surface);
    }

    /* Independent page and question surfaces carry the assessment blur. */
    .student-assessment-start-page .quiz-hero,
    .student-assessment-result-page .quiz-hero,
    .student-assessment-attempt-page .page-header {
      border-color: var(--glass-border);
      background: var(--assessment-panel-surface);
      -webkit-backdrop-filter: var(--glass-major-filter);
      backdrop-filter: var(--glass-major-filter);
      box-shadow: var(--shadow-md), inset 0 1px 0 rgba(255, 239, 218, 0.09);
    }

    .student-assessment-start-page .quiz-start-card,
    .student-assessment-attempt-page .quiz-card {
      border-color: var(--glass-border);
      background: var(--assessment-question-surface);
      -webkit-backdrop-filter: var(--glass-panel-filter);
      backdrop-filter: var(--glass-panel-filter);
      box-shadow: var(--shadow-md), inset 0 1px 0 rgba(255, 239, 218, 0.08);
    }
    .student-assessment-attempt-page .quiz-card.is-answered {
      border-color: color-mix(in srgb, var(--color-success) 48%, var(--glass-border));
      border-left-color: var(--color-success);
    }

    /* Start and attempt metadata use lighter material without nested blur. */
    .student-assessment-page .quiz-start-summary-item,
    .student-assessment-page .quiz-mixed-banner,
    .student-assessment-page .result-next-steps {
      border-color: var(--glass-border);
      background: var(--assessment-card-surface);
      box-shadow: var(--shadow-sm), inset 0 1px 0 rgba(255, 239, 218, 0.06);
    }
    .student-assessment-page .quiz-mixed-hint {
      background: color-mix(
        in srgb,
        var(--color-primary-soft) 48%,
        var(--assessment-control-surface)
      );
      box-shadow: inset 0 1px 0 rgba(255, 239, 218, 0.05);
    }
    .student-assessment-page .quiz-question-title,
    .student-assessment-page .result-meta .pill {
      border-color: var(--glass-border);
      background: var(--assessment-control-surface);
      box-shadow: inset 0 1px 0 rgba(255, 239, 218, 0.05);
    }

    .student-assessment-page .quiz-progress {
      border-color: var(--glass-border);
      background: color-mix(in srgb, var(--color-bg) 88%, transparent);
      -webkit-backdrop-filter: var(--glass-control-filter);
      backdrop-filter: var(--glass-control-filter);
      box-shadow: var(--shadow-sm), inset 0 1px 0 rgba(255, 239, 218, 0.07);
    }

    /* Inputs and choices are light controls inside their parent material. */
    .student-assessment-page .quiz-start-card input,
    .student-assessment-page .quiz-open-answer input {
      border-color: var(--glass-border);
      background: var(--assessment-control-surface);
      box-shadow: inset 0 1px 0 rgba(255, 239, 218, 0.06);
    }
    .student-assessment-page .quiz-option-card {
      border-color: var(--glass-border);
      background: var(--assessment-control-soft-surface);
      box-shadow: inset 0 1px 0 rgba(255, 239, 218, 0.05);
    }
    .student-assessment-page .quiz-option-card:hover {
      border-color: color-mix(in srgb, var(--color-primary) 60%, var(--glass-border));
      background: color-mix(
        in srgb,
        var(--color-primary-soft) 34%,
        var(--assessment-control-surface)
      );
      box-shadow: var(--shadow-sm), inset 3px 0 0 color-mix(in srgb, var(--color-primary) 62%, var(--color-border));
    }
    .student-assessment-page .quiz-option-card:focus-within {
      border-color: var(--color-primary);
      box-shadow: 0 0 0 3px var(--color-primary-soft), inset 0 1px 0 rgba(255, 239, 218, 0.06);
    }
    .student-assessment-page .quiz-option-card.is-selected {
      border-color: var(--color-primary);
      background: var(--color-primary-soft);
      box-shadow: inset 3px 0 0 var(--color-primary), inset 0 1px 0 rgba(255, 239, 218, 0.08);
    }
    .student-assessment-page .quiz-option-letter,
    .student-assessment-page .result-option-tag {
      border-color: var(--glass-border);
      background: var(--assessment-control-surface);
      box-shadow: inset 0 1px 0 rgba(255, 239, 218, 0.05);
    }
    .student-assessment-page .quiz-option-card.is-selected .quiz-option-letter {
      border-color: var(--color-primary);
      background: var(--color-primary);
      color: var(--color-bg-page);
    }

    /* Results cards stay quieter than the summary and retain all state colors. */
    .student-assessment-result-page .difficulty-breakdown,
    .student-assessment-result-page .question-card {
      border-color: var(--glass-border);
      background: var(--assessment-card-surface);
      box-shadow: var(--shadow-sm), inset 0 1px 0 rgba(255, 239, 218, 0.07);
    }
    .student-assessment-result-page .question-card.correct {
      border-top: 3px solid color-mix(in srgb, var(--color-success) 72%, var(--glass-border));
    }
    .student-assessment-result-page .question-card.incorrect {
      border-top: 3px solid color-mix(in srgb, var(--color-danger) 72%, var(--glass-border));
    }
    .student-assessment-result-page .result-score-card {
      border-color: var(--glass-border);
      background: var(--assessment-control-surface);
      box-shadow: var(--shadow-sm), inset 0 1px 0 rgba(255, 239, 218, 0.07);
    }
    .student-assessment-result-page .result-score-card.is-complete {
      border-color: color-mix(in srgb, var(--color-success) 70%, var(--glass-border));
      background: var(--color-success-soft);
    }
    .student-assessment-result-page .result-score-card.needs-review {
      border-color: color-mix(in srgb, var(--color-warning) 55%, var(--glass-border));
    }

    .student-assessment-result-page .result-option-card,
    .student-assessment-result-page .answer-note,
    .student-assessment-result-page .status-pill {
      border-color: var(--glass-border);
      background: var(--assessment-control-surface);
      box-shadow: inset 0 1px 0 rgba(255, 239, 218, 0.05);
    }
    .student-assessment-result-page .result-option-card:hover {
      border-color: var(--color-border-strong);
      background: var(--assessment-card-hover-surface);
      box-shadow: var(--shadow-sm), inset 0 1px 0 rgba(255, 239, 218, 0.06);
    }
    .student-assessment-result-page .result-option-card.is-correct {
      border-color: color-mix(in srgb, var(--color-success) 78%, var(--glass-border));
      background: var(--color-success-soft);
    }
    .student-assessment-result-page .result-option-card.is-wrong-chosen {
      border-color: color-mix(in srgb, var(--color-danger) 82%, var(--glass-border));
      background: var(--color-danger-soft);
    }
    .student-assessment-result-page .result-option-card.is-correct .quiz-option-letter {
      border-color: var(--color-success);
      color: var(--color-success);
    }
    .student-assessment-result-page .result-option-card.is-wrong-chosen .quiz-option-letter {
      border-color: var(--color-danger);
      color: var(--color-danger);
    }
    .student-assessment-result-page .result-option-card.is-correct .result-option-tag {
      border-color: var(--color-success);
      color: var(--color-success);
    }
    .student-assessment-result-page .result-option-card.is-wrong-chosen .result-option-tag {
      border-color: var(--color-danger);
      color: var(--color-danger);
    }

    .student-assessment-result-page .answer-note--correct {
      border-color: color-mix(in srgb, var(--color-success) 76%, var(--glass-border));
      background: var(--color-success-soft);
      color: var(--color-success);
    }
    .student-assessment-result-page .answer-note--wrong {
      border-color: color-mix(in srgb, var(--color-danger) 82%, var(--glass-border));
      background: var(--color-danger-soft);
      color: var(--color-danger);
    }
    .student-assessment-result-page .answer-note--unanswered {
      border-color: color-mix(in srgb, var(--color-warning) 70%, var(--glass-border));
      background: var(--color-warning-soft);
      color: var(--color-warning);
    }
    .student-assessment-result-page .status-pill--correct {
      border-color: color-mix(in srgb, var(--color-success) 56%, var(--glass-border));
      background: var(--color-success-soft);
      color: var(--color-success);
    }
    .student-assessment-result-page .status-pill--wrong {
      border-color: color-mix(in srgb, var(--color-danger) 60%, var(--glass-border));
      background: var(--color-danger-soft);
      color: var(--color-danger);
    }

    .student-assessment-page .button.secondary {
      border-color: var(--glass-border);
      background: var(--assessment-control-surface);
      box-shadow: inset 0 1px 0 rgba(255, 239, 218, 0.06);
    }

    @media (max-width: 768px) {
      .student-assessment-attempt-page .quiz-submit-bar {
        border-color: var(--glass-border);
        background: color-mix(in srgb, var(--color-bg) 90%, transparent);
        -webkit-backdrop-filter: var(--glass-control-filter);
        backdrop-filter: var(--glass-control-filter);
        box-shadow: var(--shadow-md), inset 0 1px 0 rgba(255, 239, 218, 0.07);
      }
    }
  }

  @media (prefers-reduced-transparency: reduce) {
    .student-assessment-page {
      --assessment-panel-surface: var(--color-bg);
      --assessment-question-surface: var(--color-bg);
      --assessment-card-surface: var(--color-bg);
      --assessment-card-hover-surface: var(--color-bg);
      --assessment-control-surface: var(--color-bg-subtle);
      --assessment-control-soft-surface: var(--color-bg-subtle);
    }

    .student-assessment-start-page .quiz-hero,
    .student-assessment-result-page .quiz-hero,
    .student-assessment-attempt-page .page-header,
    .student-assessment-start-page .quiz-start-card,
    .student-assessment-attempt-page .quiz-card,
    .student-assessment-page .quiz-progress,
    .student-assessment-attempt-page .quiz-submit-bar {
      -webkit-backdrop-filter: none;
      backdrop-filter: none;
    }
  }
}

/* Teacher and admin surfaces keep management density while sharing the approved material language. */
@media screen {
  @supports ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
    .management-page {
      --management-panel-surface: color-mix(in srgb, var(--color-bg) 87%, transparent);
      --management-card-surface: color-mix(in srgb, var(--color-bg) 93%, transparent);
      --management-card-hover-surface: color-mix(in srgb, var(--color-bg) 95%, transparent);
      --management-control-surface: color-mix(in srgb, var(--color-bg-subtle) 89%, transparent);
      --management-control-soft-surface: color-mix(in srgb, var(--color-bg-subtle) 60%, transparent);
      --management-material-edge: var(--glass-border);
    }

    /* Breadcrumbs stay compact and secondary to each management page heading. */
    .management-page .breadcrumb a {
      border: 1px solid color-mix(in srgb, var(--management-material-edge) 54%, transparent);
      background: var(--management-control-soft-surface);
      box-shadow: inset 0 1px 0 rgba(255, 239, 218, 0.04);
    }
    .management-page .breadcrumb a:hover {
      border-color: var(--management-material-edge);
      background: var(--management-control-surface);
    }

    /* Only independent headers and outer panels establish a backdrop material. */
    .management-page .page-header,
    .management-page .hero {
      border-color: var(--management-material-edge);
      background: var(--management-panel-surface);
      -webkit-backdrop-filter: var(--glass-major-filter);
      backdrop-filter: var(--glass-major-filter);
      box-shadow: var(--shadow-md), inset 0 1px 0 rgba(255, 239, 218, 0.09);
    }
    .management-page .page-header {
      border-left-color: var(--color-primary);
    }
    .management-page .dzi-page-header {
      border-left-color: var(--color-accent-dzi);
    }
    .management-page .dzi-hero {
      border-top-color: var(--color-accent-dzi);
    }

    .management-page .dashboard-card,
    .management-page .teacher-form-card,
    .management-page .teacher-list-card,
    .management-page .teacher-filter-card,
    .management-page .teacher-summary-card,
    .management-page .teacher-table-card,
    .management-page .teacher-open-answers-card,
    .management-page .dzi-panel,
    .management-page .practical-submissions-card,
    .management-login-page .login-card,
    .admin-management-page .panel,
    .management-detail-page .app-shell > .card {
      border-color: var(--management-material-edge);
      background: var(--management-panel-surface);
      -webkit-backdrop-filter: var(--glass-panel-filter);
      backdrop-filter: var(--glass-panel-filter);
      box-shadow: var(--shadow-md), inset 0 1px 0 rgba(255, 239, 218, 0.075);
    }

    /* Nested cards and form groups use surface depth without another backdrop root. */
    .management-page .teacher-stat-grid .card,
    .management-page .assignment-mini-card,
    .management-page .teacher-form-section,
    .management-page .mix-card,
    .management-page .detail-grid > div,
    .management-page .dzi-start-summary-item,
    .management-page .dzi-source-card,
    .management-page .dzi-task-card,
    .management-page .practical-task-card,
    .management-page .practical-source-option,
    .management-page .stat-box {
      border-color: var(--management-material-edge);
      background: var(--management-card-surface);
      box-shadow: var(--shadow-sm), inset 0 1px 0 rgba(255, 239, 218, 0.06);
    }
    .management-page .dashboard-summary-grid .card,
    .management-page .teacher-results-overview .card {
      border-left-color: color-mix(in srgb, var(--color-primary) 54%, var(--management-material-edge));
    }
    .management-page .assignment-mini-card:hover,
    .management-page .assignment-mini-card:focus-within,
    .management-page .dzi-source-card:hover,
    .management-page .dzi-task-card:hover,
    .management-page .practical-task-card:hover {
      border-color: var(--color-border-strong);
      background: var(--management-card-hover-surface);
      box-shadow: var(--shadow-md), inset 0 1px 0 rgba(255, 239, 218, 0.08);
    }
    .management-page .dzi-task-card,
    .management-page .practical-task-card {
      border-top-color: color-mix(in srgb, var(--color-accent-dzi) 65%, var(--management-material-edge));
    }
    .management-page .dzi-start-summary-item {
      border-color: color-mix(in srgb, var(--color-accent-dzi) 36%, var(--management-material-edge));
      background: color-mix(in srgb, var(--management-card-surface) 78%, var(--color-accent-dzi-soft));
    }
    .management-page .practical-source-option {
      border-color: color-mix(in srgb, var(--color-accent-dzi) 30%, var(--management-material-edge));
    }

    /* Preserve the established warning and DZI identities above the neutral material. */
    .management-page .open-question-panel {
      box-shadow: inset 0 1px 0 rgba(255, 239, 218, 0.055);
    }
    .management-page .practical-assignment-panel {
      box-shadow: inset 0 1px 0 rgba(255, 239, 218, 0.055);
    }

    /* Dense tables use one restrained container; rows and cells do not blur independently. */
    .management-page .table-wrap {
      border-color: var(--management-material-edge);
      background-color: var(--management-card-surface);
      box-shadow: inset 0 1px 0 rgba(255, 239, 218, 0.05);
    }
    .management-page .teacher-table th,
    .admin-management-page .panel table th {
      background: var(--management-control-surface);
    }
    .management-page .teacher-table tbody tr,
    .admin-management-page .panel table tbody tr {
      background: color-mix(in srgb, var(--color-bg) 90%, transparent);
    }
    .management-page .teacher-table tbody tr:nth-child(even),
    .admin-management-page .panel table tbody tr:nth-child(even) {
      background: color-mix(in srgb, var(--color-bg-subtle) 62%, transparent);
    }
    .management-page .teacher-table tbody tr:hover,
    .admin-management-page .panel table tbody tr:hover {
      background: var(--management-control-surface);
    }
    .management-page .teacher-table .links a,
    .management-page .teacher-table .link-button {
      border-color: var(--management-material-edge);
      background: var(--management-control-soft-surface);
      box-shadow: inset 0 1px 0 rgba(255, 239, 218, 0.04);
    }
    .management-page .teacher-table .links a:hover,
    .management-page .teacher-table .link-button:hover {
      border-color: var(--color-border-strong);
      background: var(--color-primary-soft);
    }

    /* Inputs stay practical and native controls keep their existing semantics. */
    .management-page input:not([type="radio"]):not([type="checkbox"]):not([type="file"]),
    .management-page select,
    .management-page textarea {
      border-color: var(--management-material-edge);
      background: var(--management-control-surface);
      box-shadow: inset 0 1px 0 rgba(255, 239, 218, 0.045);
    }
    .management-page input:not([type="radio"]):not([type="checkbox"]):not([type="file"]):focus-visible,
    .management-page select:focus-visible,
    .management-page textarea:focus-visible {
      border-color: var(--color-primary);
      outline: 3px solid color-mix(in srgb, var(--color-primary) 30%, transparent);
      outline-offset: 2px;
      box-shadow: 0 0 0 1px color-mix(in srgb, var(--color-primary) 24%, transparent);
    }
    .management-page input:disabled,
    .management-page select:disabled,
    .management-page textarea:disabled,
    .management-page input[readonly],
    .management-page textarea[readonly] {
      border-color: var(--color-border);
      background: var(--color-bg);
      color: var(--color-text-muted);
      box-shadow: none;
    }

    .management-page .filter-bar,
    .management-page .share-box,
    .management-page .open-answer-review-form,
    .management-page .dzi-toolbar {
      border: 1px solid var(--management-material-edge);
      border-radius: var(--radius-md);
      background: var(--management-control-soft-surface);
      box-shadow: inset 0 1px 0 rgba(255, 239, 218, 0.045);
    }
    .management-page .filter-bar,
    .management-page .share-box,
    .management-page .open-answer-review-form {
      padding: var(--space-3);
    }
    .management-page .open-answer-review-form {
      display: grid;
      gap: var(--space-2);
    }
    .management-page .open-answer-review-form label {
      margin-top: 0;
    }
    .management-page .count-pill,
    .management-page .section-heading > .pill,
    .management-page .question-toolbar > .pill {
      border-color: var(--management-material-edge);
      background: var(--management-control-surface);
      box-shadow: inset 0 1px 0 rgba(255, 239, 218, 0.05);
    }
    .management-page .button.secondary {
      border-color: var(--management-material-edge);
      background: var(--management-control-surface);
      box-shadow: var(--shadow-sm), inset 0 1px 0 rgba(255, 239, 218, 0.05);
    }
    .management-page .button.secondary:hover {
      border-color: var(--color-border-strong);
      background: color-mix(in srgb, var(--management-control-surface) 78%, var(--color-primary-soft));
    }
    .management-page .button:disabled,
    .management-page button:disabled,
    .management-page .button[aria-disabled="true"] {
      border-color: var(--color-border);
      background: var(--color-bg-subtle);
      box-shadow: none;
    }
  }

  @media (prefers-reduced-transparency: reduce) {
    .management-page {
      --management-panel-surface: var(--color-bg);
      --management-card-surface: var(--color-bg);
      --management-card-hover-surface: var(--color-bg-subtle);
      --management-control-surface: var(--color-bg-subtle);
      --management-control-soft-surface: var(--color-bg-subtle);
    }

    .management-page .page-header,
    .management-page .hero,
    .management-page .dashboard-card,
    .management-page .teacher-form-card,
    .management-page .teacher-list-card,
    .management-page .teacher-filter-card,
    .management-page .teacher-summary-card,
    .management-page .teacher-table-card,
    .management-page .teacher-open-answers-card,
    .management-page .dzi-panel,
    .management-page .practical-submissions-card,
    .management-login-page .login-card,
    .admin-management-page .panel,
    .management-detail-page .app-shell > .card {
      -webkit-backdrop-filter: none;
      backdrop-filter: none;
    }
  }
}