body.classroom-index-page {
  --class-bg: #05070b;
  --class-surface: #0b0f16;
  --class-fg: #f4f6f8;
  --class-muted: #a9b0ba;
  --class-primary: #ff8a34;
  --class-secondary: #171d26;
  --class-success: #4fd18b;
  --class-on-primary: #ffffff;
  --class-border: rgba(255, 255, 255, 0.13);
  --class-card: rgba(255, 255, 255, 0.05);
  --class-ring: rgba(255, 138, 52, 0.45);
  --class-space-1: 4px;
  --class-space-2: 8px;
  --class-space-3: 12px;
  --class-space-4: 16px;
  --class-space-5: 20px;
  --class-space-6: 24px;
  --class-space-8: 32px;
  --class-space-10: 40px;
  --class-space-12: 48px;
  --class-space-16: 64px;
  --class-space-20: 80px;
  min-height: 100vh;
  overflow-x: hidden;
  background: var(--class-bg);
  color: var(--class-fg);
}

.classroom-index-page .site-header {
  background: rgba(5, 7, 11, 0.78);
  border-bottom: 1px solid var(--class-border);
  backdrop-filter: blur(18px);
}

.classroom-index-page .site-header .brand,
.classroom-index-page .site-header .navlinks {
  color: var(--class-fg);
}

.classroom-index-page .navlinks > a:hover,
.classroom-index-page .navlinks > a.active,
.classroom-index-page .app-dropdown[open] > summary {
  background: var(--class-fg);
  color: var(--class-bg);
}

.classroom-hub {
  min-height: calc(100vh - 152px);
  padding-top: var(--class-space-16);
  padding-bottom: var(--class-space-20);
}

.classroom-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--class-space-2);
  margin-bottom: var(--class-space-6);
  color: var(--class-muted);
  font-size: 0.875rem;
  font-weight: 750;
}

.classroom-breadcrumb a {
  color: var(--class-fg);
}

.classroom-breadcrumb a:hover {
  text-decoration: underline;
  text-underline-offset: var(--class-space-1);
}

.classroom-breadcrumb strong {
  color: var(--class-primary);
}

.classroom-heading {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(200px, 320px);
  gap: var(--class-space-8);
  align-items: end;
  padding-bottom: var(--class-space-10);
}

.classroom-heading h1 {
  color: var(--class-fg);
  font-size: clamp(2.75rem, 7vw, 4.5rem);
  line-height: 1.05;
  letter-spacing: 0;
}

.classroom-heading p {
  color: var(--class-muted);
  font-size: 1rem;
  line-height: 1.65;
}

.board-section {
  border-top: 1px solid var(--class-border);
  border-bottom: 1px solid var(--class-border);
}

.board-head,
.board-row {
  display: grid;
  grid-template-columns: 112px minmax(0, 1fr) 148px 40px;
  align-items: center;
  gap: var(--class-space-4);
}

.board-head {
  min-height: 48px;
  color: var(--class-muted);
  font-size: 0.8125rem;
  font-weight: 750;
}

.board-head span:nth-child(3) {
  text-align: right;
}

.board-row {
  min-height: 112px;
  padding: var(--class-space-6) var(--class-space-2);
  border-top: 1px solid var(--class-border);
  border-radius: 8px;
  background: transparent;
  transition: background 180ms ease-out, border-color 180ms ease-out, transform 180ms ease-out;
}

.board-row:hover {
  background: var(--class-card);
  border-color: rgba(255, 255, 255, 0.22);
  transform: translateX(var(--class-space-1));
}

.board-row:focus-visible,
.empty-back:focus-visible {
  outline: 3px solid var(--class-ring);
  outline-offset: 2px;
}

.board-index {
  color: var(--class-primary);
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 850;
  font-variant-numeric: tabular-nums;
}

.board-copy {
  min-width: 0;
}

.board-copy strong {
  display: block;
  color: var(--class-fg);
  font-size: 1.25rem;
  line-height: 1.3;
  letter-spacing: 0;
}

.board-copy span {
  display: block;
  margin-top: var(--class-space-1);
  overflow: hidden;
  color: var(--class-muted);
  font-size: 0.9375rem;
  line-height: 1.5;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.board-status {
  justify-self: end;
  padding: var(--class-space-1) var(--class-space-2);
  border: 1px solid var(--class-border);
  border-radius: 4px;
  color: var(--class-muted);
  font-size: 0.8125rem;
  font-weight: 750;
  white-space: nowrap;
}

.board-status.ready {
  border-color: rgba(79, 209, 139, 0.38);
  color: var(--class-success);
}

.board-arrow {
  justify-self: end;
  color: var(--class-fg);
  font-size: 1.5rem;
  line-height: 1;
}

.empty-state {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: var(--class-space-8);
  align-items: end;
  margin-top: var(--class-space-8);
  padding: var(--class-space-10) 0;
  border-top: 1px solid var(--class-border);
  border-bottom: 1px solid var(--class-border);
}

.empty-state h2 {
  color: var(--class-fg);
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  line-height: 1.2;
  letter-spacing: 0;
}

.empty-state p {
  max-width: 640px;
  margin-top: var(--class-space-3);
  color: var(--class-muted);
}

.empty-back {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 var(--class-space-4);
  border: 1px solid var(--class-border);
  border-radius: 8px;
  background: var(--class-secondary);
  color: var(--class-fg);
  font-weight: 800;
  white-space: nowrap;
}

.empty-back:hover {
  border-color: var(--class-primary);
}

.classroom-index-page .footer {
  border-top-color: var(--class-border);
  background: rgba(5, 7, 11, 0.72);
}

.classroom-index-page .footer-inner,
.classroom-index-page .footer-inner strong {
  color: var(--class-muted);
}

@media (max-width: 780px) {
  .classroom-hub {
    min-height: calc(100vh - 176px);
    padding-top: var(--class-space-10);
    padding-bottom: var(--class-space-16);
  }

  .classroom-heading {
    grid-template-columns: 1fr;
    gap: var(--class-space-4);
    padding-bottom: var(--class-space-8);
  }

  .board-head {
    display: none;
  }

  .board-row {
    grid-template-columns: 72px minmax(0, 1fr) 32px;
    min-height: 104px;
    padding: var(--class-space-5) 0;
    border-radius: 0;
  }

  .board-row:first-of-type {
    border-top: 0;
  }

  .board-status {
    grid-column: 2;
    justify-self: start;
    margin-top: calc(var(--class-space-2) * -1);
  }

  .board-arrow {
    grid-column: 3;
    grid-row: 1 / span 2;
  }

  .board-copy span {
    white-space: normal;
  }

  .empty-state {
    grid-template-columns: 1fr;
    align-items: start;
  }

  .empty-back {
    width: fit-content;
  }
}

@media (prefers-reduced-motion: reduce) {
  .board-row,
  .empty-back {
    transition: none;
  }

  .board-row:hover {
    transform: none;
  }
}