:root {
  color-scheme: light;
  --lab-bg: oklch(98% 0.006 235);
  --lab-bg-soft: oklch(96.8% 0.008 235);
  --lab-surface: oklch(99.5% 0.004 235);
  --lab-surface-strong: oklch(94.8% 0.014 235);
  --lab-line: oklch(88% 0.012 235);
  --lab-line-strong: oklch(79% 0.022 235);
  --lab-text: oklch(21% 0.025 245);
  --lab-text-soft: oklch(43% 0.03 245);
  --lab-muted: oklch(54% 0.024 245);
  --lab-primary: oklch(54% 0.18 252);
  --lab-primary-dark: oklch(43% 0.17 252);
  --lab-primary-soft: oklch(94% 0.04 252);
  --lab-cyan: oklch(68% 0.13 210);
  --lab-success: oklch(55% 0.13 150);
  --lab-success-soft: oklch(94% 0.045 150);
  --lab-warning: oklch(70% 0.14 75);
  --lab-warning-soft: oklch(95% 0.05 75);
  --lab-danger: oklch(58% 0.17 28);
  --lab-danger-soft: oklch(94% 0.045 28);
  --lab-dark: oklch(20% 0.035 245);
  --lab-dark-2: oklch(25% 0.038 245);
  --lab-dark-line: oklch(38% 0.04 245);
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 2px oklch(21% 0.025 245 / 0.08);
  --shadow-md: 0 16px 40px oklch(21% 0.025 245 / 0.12);
  --font-sans: "Source Sans 3", "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, Arial, sans-serif;
  --font-mono: "IBM Plex Mono", "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  background: var(--lab-bg);
}

body.course-product {
  min-height: 100dvh;
  margin: 0;
  background:
    radial-gradient(circle at 12% 0%, oklch(94% 0.045 252 / 0.72), transparent 28rem),
    linear-gradient(180deg, var(--lab-bg) 0%, oklch(97% 0.008 235) 100%);
  color: var(--lab-text);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body.course-product button,
body.course-product input,
body.course-product select,
body.course-product textarea {
  font: inherit;
}

body.course-product a {
  color: inherit;
}

.skip-link {
  position: fixed;
  inset: 12px auto auto 12px;
  z-index: 20;
  transform: translateY(-160%);
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  background: var(--lab-text);
  color: var(--lab-surface);
  transition: transform 180ms var(--ease-out);
}

.skip-link:focus {
  transform: translateY(0);
}

:focus-visible {
  outline: 3px solid oklch(69% 0.13 210);
  outline-offset: 3px;
}

.app-shell {
  min-height: 100dvh;
  display: grid;
  grid-template-columns: 272px minmax(0, 1fr);
}

.side-nav {
  position: sticky;
  top: 0;
  height: 100dvh;
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
  padding: var(--space-6);
  border-right: 1px solid var(--lab-line);
  background: oklch(99% 0.006 235 / 0.92);
}

.brand-lockup {
  display: grid;
  gap: var(--space-1);
  text-decoration: none;
}

.brand-lockup strong {
  font-size: 0.98rem;
  font-weight: 750;
}

.brand-lockup span {
  color: var(--lab-muted);
  font-size: 0.78rem;
}

.nav-section {
  display: grid;
  gap: var(--space-2);
}

.nav-section-title {
  margin: 0 0 var(--space-1);
  color: var(--lab-muted);
  font-size: 0.72rem;
  font-weight: 750;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.nav-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 42px;
  padding: 10px 12px;
  border-radius: var(--radius-md);
  color: var(--lab-text-soft);
  text-decoration: none;
}

.nav-link:hover,
.nav-link:focus-visible,
.nav-link.is-active {
  background: var(--lab-primary-soft);
  color: var(--lab-primary-dark);
}

.nav-link small {
  color: var(--lab-muted);
  font-size: 0.72rem;
}

.nav-footer {
  margin-top: auto;
  display: grid;
  gap: var(--space-3);
}

.identity-pill {
  display: grid;
  gap: 2px;
  padding: var(--space-3);
  border: 1px solid var(--lab-line);
  border-radius: var(--radius-md);
  background: var(--lab-surface);
}

.identity-pill span {
  color: var(--lab-muted);
  font-size: 0.76rem;
}

.identity-pill strong {
  font-size: 0.9rem;
}

.app-main {
  min-width: 0;
  padding: var(--space-6);
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}

.topbar h1,
.page-title h1,
.login-title h1 {
  margin: 0;
  color: var(--lab-text);
  font-size: 1.75rem;
  line-height: 1.15;
  font-weight: 780;
  text-wrap: balance;
}

.topbar p,
.page-title p,
.login-title p {
  max-width: 68ch;
  margin: var(--space-2) 0 0;
  color: var(--lab-text-soft);
}

.toolbar-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-2);
}

.button,
.ghost-button,
.danger-button,
.chip-button {
  min-height: 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 9px 14px;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
  transition:
    transform 160ms var(--ease-out),
    background 160ms var(--ease-out),
    border-color 160ms var(--ease-out),
    color 160ms var(--ease-out);
}

.button {
  background: var(--lab-primary);
  color: oklch(99% 0.004 235);
}

.button:hover,
.button:focus-visible {
  background: var(--lab-primary-dark);
  transform: translateY(-1px);
}

.ghost-button,
.chip-button {
  border-color: var(--lab-line);
  background: var(--lab-surface);
  color: var(--lab-text);
}

.ghost-button:hover,
.ghost-button:focus-visible,
.chip-button:hover,
.chip-button:focus-visible {
  border-color: var(--lab-line-strong);
  background: var(--lab-bg-soft);
}

.danger-button {
  border-color: oklch(86% 0.06 28);
  background: var(--lab-danger-soft);
  color: var(--lab-danger);
}

.button[disabled],
.ghost-button[disabled],
.chip-button[disabled] {
  cursor: not-allowed;
  opacity: 0.52;
  transform: none;
}

.panel {
  border: 1px solid var(--lab-line);
  border-radius: var(--radius-lg);
  background: var(--lab-surface);
  box-shadow: var(--shadow-sm);
}

.panel-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-5) var(--space-5) var(--space-3);
}

.panel-header h2,
.panel-header h3 {
  margin: 0;
  font-size: 1.05rem;
  line-height: 1.25;
}

.panel-header p {
  margin: var(--space-1) 0 0;
  color: var(--lab-text-soft);
  font-size: 0.9rem;
}

.panel-body {
  padding: 0 var(--space-5) var(--space-5);
}

.workspace-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: var(--space-6);
  align-items: start;
}

.course-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-4);
}

.course-card {
  min-height: 230px;
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  padding: var(--space-5);
  border: 1px solid var(--lab-line);
  border-radius: var(--radius-lg);
  background: var(--lab-surface);
  color: var(--lab-text);
  text-decoration: none;
  box-shadow: var(--shadow-sm);
  transition:
    transform 180ms var(--ease-out),
    border-color 180ms var(--ease-out),
    box-shadow 180ms var(--ease-out);
}

.course-card:hover,
.course-card:focus-visible {
  transform: translateY(-2px);
  border-color: oklch(74% 0.07 252);
  box-shadow: var(--shadow-md);
}

.course-card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-3);
}

.course-code {
  color: var(--lab-primary-dark);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 750;
  letter-spacing: 0.04em;
}

.course-card h2,
.course-card h3 {
  margin: var(--space-2) 0 0;
  font-size: 1.08rem;
  line-height: 1.25;
}

.course-card p {
  margin: 0;
  color: var(--lab-text-soft);
  font-size: 0.92rem;
}

.progress-track {
  width: 100%;
  height: 8px;
  overflow: hidden;
  border-radius: 999px;
  background: var(--lab-bg-soft);
}

.progress-track span {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: var(--lab-primary);
}

.status-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  width: fit-content;
  min-height: 28px;
  padding: 5px 9px;
  border: 1px solid var(--lab-line);
  border-radius: 999px;
  background: var(--lab-bg-soft);
  color: var(--lab-text-soft);
  font-size: 0.78rem;
  font-weight: 750;
}

.status-chip::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: currentColor;
}

.status-chip.is-ready,
.status-chip.is-published,
.status-chip.is-submitted {
  border-color: oklch(84% 0.06 150);
  background: var(--lab-success-soft);
  color: oklch(42% 0.12 150);
}

.status-chip.is-warning,
.status-chip.is-progress,
.status-chip.is-draft {
  border-color: oklch(86% 0.07 75);
  background: var(--lab-warning-soft);
  color: oklch(47% 0.12 75);
}

.status-chip.is-danger,
.status-chip.is-unavailable {
  border-color: oklch(86% 0.07 28);
  background: var(--lab-danger-soft);
  color: var(--lab-danger);
}

.next-step {
  display: grid;
  gap: var(--space-3);
}

.next-step-card {
  padding: var(--space-4);
  border: 1px solid var(--lab-line);
  border-radius: var(--radius-md);
  background: var(--lab-primary-soft);
}

.next-step-card strong {
  display: block;
  margin-bottom: var(--space-1);
}

.next-step-card p {
  margin: 0;
  color: var(--lab-text-soft);
}

.experiment-preview {
  display: grid;
  gap: var(--space-4);
  padding: var(--space-5);
  border-radius: var(--radius-lg);
  background:
    radial-gradient(circle at 82% 12%, oklch(68% 0.13 210 / 0.2), transparent 12rem),
    linear-gradient(180deg, var(--lab-dark-2), var(--lab-dark));
  color: oklch(95% 0.012 235);
}

.experiment-preview h3 {
  margin: 0;
  font-size: 1.05rem;
}

.experiment-preview p {
  margin: 0;
  color: oklch(82% 0.025 235);
}

.mini-chart {
  display: grid;
  grid-template-columns: repeat(10, 1fr);
  align-items: end;
  gap: 6px;
  height: 104px;
  padding: var(--space-3);
  border: 1px solid var(--lab-dark-line);
  border-radius: var(--radius-md);
  background: oklch(16% 0.028 245);
}

.mini-chart span {
  min-height: 12px;
  border-radius: 999px 999px 4px 4px;
  background: linear-gradient(180deg, var(--lab-cyan), var(--lab-primary));
}

.stage-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 330px;
  gap: var(--space-6);
  align-items: start;
}

.stage-tabs {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

.stage-tab {
  min-height: 56px;
  padding: var(--space-3);
  border: 1px solid var(--lab-line);
  border-radius: var(--radius-md);
  background: var(--lab-surface);
  color: var(--lab-text-soft);
  cursor: pointer;
  text-align: left;
}

.stage-tab span {
  display: block;
  color: var(--lab-muted);
  font-family: var(--font-mono);
  font-size: 0.72rem;
}

.stage-tab strong {
  display: block;
  margin-top: 2px;
}

.stage-tab.is-active {
  border-color: oklch(74% 0.07 252);
  background: var(--lab-primary-soft);
  color: var(--lab-primary-dark);
}

.stage-panel {
  display: none;
}

.stage-panel.is-active {
  display: block;
}

.resource-list,
.task-list,
.teacher-list {
  display: grid;
  gap: var(--space-3);
}

.resource-row,
.task-row,
.teacher-row {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: var(--space-3);
  align-items: center;
  padding: var(--space-3);
  border: 1px solid var(--lab-line);
  border-radius: var(--radius-md);
  background: var(--lab-surface);
}

.resource-icon {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border-radius: var(--radius-sm);
  background: var(--lab-bg-soft);
  color: var(--lab-primary-dark);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 800;
}

.resource-row strong,
.task-row strong,
.teacher-row strong {
  display: block;
}

.resource-row span,
.task-row span,
.teacher-row span {
  color: var(--lab-muted);
  font-size: 0.84rem;
}

.two-column {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: var(--space-4);
}

.form-grid {
  display: grid;
  gap: var(--space-4);
}

.field {
  display: grid;
  gap: var(--space-2);
}

.field label {
  color: var(--lab-text);
  font-size: 0.86rem;
  font-weight: 750;
}

.field input,
.field select,
.field textarea {
  width: 100%;
  min-height: 42px;
  padding: 10px 12px;
  border: 1px solid var(--lab-line);
  border-radius: var(--radius-md);
  background: var(--lab-surface);
  color: var(--lab-text);
}

.field input[aria-invalid="true"] {
  border-color: var(--lab-danger);
  box-shadow: 0 0 0 3px oklch(94% 0.045 28);
}

.field textarea {
  min-height: 108px;
  resize: vertical;
}

.field small,
.form-message {
  color: var(--lab-muted);
  font-size: 0.84rem;
}

.form-message.is-error {
  color: var(--lab-danger);
}

.form-message.is-success {
  color: oklch(42% 0.12 150);
}

.login-page {
  min-height: 100dvh;
  display: grid;
  place-items: center;
  padding: var(--space-6);
}

.login-shell {
  width: min(1080px, 100%);
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(360px, 0.75fr);
  gap: var(--space-6);
  align-items: stretch;
}

.login-access-panel,
.login-card {
  border: 1px solid var(--lab-line);
  border-radius: 22px;
  background: var(--lab-surface);
  box-shadow: var(--shadow-md);
}

.login-access-panel {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: var(--space-8);
  padding: var(--space-8);
}

.login-title {
  display: grid;
  gap: var(--space-4);
}

.role-summary {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-3);
}

.role-summary article {
  padding: var(--space-4);
  border: 1px solid var(--lab-line);
  border-radius: var(--radius-md);
  background: var(--lab-bg-soft);
}

.role-summary h2 {
  margin: 0 0 var(--space-2);
  font-size: 1rem;
}

.role-summary p {
  margin: 0;
  color: var(--lab-text-soft);
  font-size: 0.9rem;
}

.login-card {
  padding: var(--space-6);
}

.role-toggle {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2);
  padding: 4px;
  border: 1px solid var(--lab-line);
  border-radius: var(--radius-md);
  background: var(--lab-bg-soft);
}

.role-toggle button {
  min-height: 40px;
  border: 0;
  border-radius: 10px;
  background: transparent;
  color: var(--lab-text-soft);
  font-weight: 750;
  cursor: pointer;
}

.role-toggle button.is-active {
  background: var(--lab-surface);
  color: var(--lab-primary-dark);
  box-shadow: var(--shadow-sm);
}

.login-form {
  display: grid;
  gap: var(--space-4);
  margin-top: var(--space-5);
}

.credential-hint {
  padding: var(--space-3);
  border-radius: var(--radius-md);
  background: var(--lab-primary-soft);
  color: var(--lab-primary-dark);
  font-family: var(--font-mono);
  font-size: 0.82rem;
}

.teacher-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(360px, 0.8fr);
  gap: var(--space-6);
  align-items: start;
}

.upload-drop {
  display: grid;
  gap: var(--space-3);
  padding: var(--space-4);
  border: 1px dashed var(--lab-line-strong);
  border-radius: var(--radius-lg);
  background: var(--lab-bg-soft);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  min-height: 1px;
  padding: 0;
  border: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
}

.field input.visually-hidden {
  width: 1px;
  min-height: 1px;
  padding: 0;
  border: 0;
}

.file-picker {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3);
}

.file-picker .ghost-button {
  width: auto;
}

.file-picker span {
  color: var(--lab-text-soft);
  font-size: 0.9rem;
}

.preview-frame {
  display: grid;
  gap: var(--space-4);
  padding: var(--space-4);
  border-radius: var(--radius-lg);
  background: var(--lab-bg-soft);
}

.empty-state {
  padding: var(--space-5);
  border: 1px dashed var(--lab-line-strong);
  border-radius: var(--radius-md);
  background: var(--lab-bg-soft);
  color: var(--lab-text-soft);
}

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

@media (max-width: 1080px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  .side-nav {
    position: relative;
    height: auto;
    border-right: 0;
    border-bottom: 1px solid var(--lab-line);
  }

  .nav-footer {
    margin-top: 0;
  }

  .workspace-grid,
  .stage-shell,
  .teacher-grid,
  .login-shell {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 760px) {
  .app-main,
  .side-nav,
  .login-page {
    padding: var(--space-4);
  }

  .topbar {
    align-items: flex-start;
    flex-direction: column;
  }

  .toolbar-actions {
    justify-content: stretch;
    width: 100%;
  }

  .toolbar-actions > *,
  .button,
  .ghost-button,
  .danger-button {
    width: 100%;
  }

  .stage-tabs,
  .two-column,
  .role-summary {
    grid-template-columns: 1fr;
  }

  .resource-row,
  .task-row,
  .teacher-row {
    grid-template-columns: auto minmax(0, 1fr);
  }

  .resource-row .button,
  .resource-row .ghost-button,
  .task-row .button,
  .task-row .ghost-button,
  .teacher-row .button,
  .teacher-row .ghost-button {
    grid-column: 1 / -1;
  }

  .topbar h1,
  .page-title h1,
  .login-title h1 {
    font-size: 1.45rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}

/* PowerLab Classroom student surfaces */

body.student-classroom {
  --class-bg: oklch(98.2% 0.006 242);
  --class-sidebar: oklch(97.2% 0.01 242);
  --class-surface: oklch(99.5% 0.004 242);
  --class-surface-soft: oklch(96.4% 0.012 242);
  --class-line: oklch(88.5% 0.014 242);
  --class-line-strong: oklch(78% 0.028 242);
  --class-text: oklch(20.5% 0.032 252);
  --class-muted: oklch(47% 0.033 252);
  --class-soft: oklch(58% 0.028 252);
  --class-primary: oklch(54% 0.19 254);
  --class-primary-dark: oklch(42% 0.17 254);
  --class-primary-soft: oklch(94.5% 0.045 254);
  --class-green: oklch(53% 0.13 151);
  --class-green-soft: oklch(94% 0.045 151);
  --class-amber: oklch(70% 0.14 78);
  --class-amber-soft: oklch(95% 0.052 78);
  --class-red: oklch(58% 0.17 29);
  --class-red-soft: oklch(94% 0.045 29);
  --class-dark: oklch(19% 0.036 248);
  --class-dark-2: oklch(24% 0.04 248);
  --class-dark-line: oklch(38% 0.045 248);
  --class-radius: 8px;
  background:
    linear-gradient(180deg, oklch(99% 0.004 242), var(--class-bg));
  color: var(--class-text);
}

.classroom-shell {
  min-height: 100dvh;
  display: grid;
  grid-template-columns: 304px minmax(0, 1fr);
  background: var(--class-bg);
}

.classroom-sidebar {
  position: sticky;
  top: 0;
  height: 100dvh;
  display: flex;
  flex-direction: column;
  gap: 24px;
  overflow: auto;
  padding: 18px 14px;
  border-right: 1px solid var(--class-line);
  background: var(--class-sidebar);
}

.classroom-brand {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 12px;
  align-items: center;
  padding: 2px 4px 10px;
  color: var(--class-text);
  text-decoration: none;
}

.brand-mark {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border-radius: 8px;
  background: var(--class-primary);
  color: oklch(99% 0.004 242);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 800;
}

.classroom-brand strong,
.classroom-brand small {
  display: block;
}

.classroom-brand strong {
  font-size: 1rem;
  line-height: 1.2;
}

.classroom-brand small {
  margin-top: 2px;
  color: var(--class-muted);
  font-size: 0.78rem;
}

.classroom-nav,
.classroom-course-menu,
.classroom-sidebar-footer {
  display: grid;
  gap: 8px;
}

.classroom-nav-link,
.course-menu-item {
  min-height: 42px;
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr) auto;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  border: 1px solid transparent;
  border-radius: 8px;
  color: var(--class-muted);
  text-decoration: none;
  transition:
    background 160ms var(--ease-out),
    border-color 160ms var(--ease-out),
    color 160ms var(--ease-out);
}

.classroom-nav-link:hover,
.classroom-nav-link:focus-visible,
.classroom-nav-link.is-active,
.course-menu-item:hover,
.course-menu-item:focus-visible,
.course-menu-item.is-active {
  border-color: oklch(90% 0.032 254);
  background: var(--class-primary-soft);
  color: var(--class-primary-dark);
}

.classroom-nav-link.as-button {
  width: 100%;
  border: 1px solid transparent;
  background: transparent;
  text-align: left;
  cursor: pointer;
}

.nav-icon,
.course-file-icon {
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  border: 1px solid var(--class-line);
  border-radius: 7px;
  background: var(--class-surface);
  color: currentColor;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 800;
}

.nav-count {
  min-width: 22px;
  height: 22px;
  display: grid;
  place-items: center;
  border-radius: 999px;
  background: var(--class-primary);
  color: oklch(99% 0.004 242);
  font-size: 0.72rem;
  font-weight: 800;
}

.course-menu-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 8px 0;
  color: var(--class-text);
  font-size: 0.86rem;
  font-weight: 760;
}

.course-menu-list {
  display: grid;
  gap: 5px;
}

.course-menu-item {
  grid-template-columns: 30px minmax(0, 1fr);
  min-height: 52px;
}

.course-menu-item strong,
.course-menu-item small {
  display: block;
}

.course-menu-item strong {
  overflow: hidden;
  font-size: 0.88rem;
  line-height: 1.2;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.course-menu-item small {
  margin-top: 2px;
  color: var(--class-soft);
  font-size: 0.74rem;
}

.classroom-sidebar-footer {
  margin-top: auto;
  padding-top: 14px;
  border-top: 1px solid var(--class-line);
}

.classroom-main {
  min-width: 0;
  background: var(--class-bg);
}

.classroom-topbar {
  position: sticky;
  top: 0;
  z-index: 8;
  min-height: 62px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 10px 28px;
  border-bottom: 1px solid var(--class-line);
  background: oklch(99.2% 0.004 242 / 0.96);
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
  color: var(--class-muted);
  font-size: 0.92rem;
}

.breadcrumb a {
  color: var(--class-primary-dark);
  font-weight: 740;
  text-decoration: none;
}

.breadcrumb span:last-child {
  overflow: hidden;
  color: var(--class-text);
  font-weight: 700;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.topbar-tools {
  display: flex;
  align-items: center;
  gap: 12px;
}

.classroom-search {
  width: min(420px, 34vw);
  min-height: 40px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 8px;
  padding: 0 10px 0 12px;
  border: 1px solid var(--class-line);
  border-radius: 8px;
  background: var(--class-surface);
}

.classroom-search input {
  min-width: 0;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--class-text);
  font-size: 0.9rem;
}

.classroom-search input::placeholder {
  color: var(--class-soft);
}

.classroom-search kbd {
  min-width: 22px;
  height: 22px;
  display: grid;
  place-items: center;
  border: 1px solid var(--class-line);
  border-radius: 5px;
  background: var(--class-surface-soft);
  color: var(--class-muted);
  font: 700 0.75rem/1 var(--font-mono);
}

.icon-button {
  width: 34px;
  height: 34px;
  display: inline-grid;
  place-items: center;
  border: 1px solid var(--class-line);
  border-radius: 8px;
  background: var(--class-surface);
  color: var(--class-muted);
  font-weight: 800;
  line-height: 1;
  text-decoration: none;
  cursor: pointer;
}

.icon-button:hover,
.icon-button:focus-visible {
  border-color: var(--class-line-strong);
  color: var(--class-primary-dark);
}

.profile-chip {
  min-height: 40px;
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--class-text);
  font-size: 0.88rem;
}

.avatar {
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  border-radius: 999px;
  background: var(--class-text);
  color: oklch(99% 0.004 242);
  font-size: 0.78rem;
  font-weight: 800;
}

.avatar.is-soft {
  background: var(--class-primary-soft);
  color: var(--class-primary-dark);
}

.classroom-content {
  width: min(1540px, 100%);
  margin: 0 auto;
  padding: 28px;
}

.dashboard-heading,
.course-identity {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 22px;
}

.section-kicker {
  margin: 0 0 8px;
  color: var(--class-primary-dark);
  font-size: 0.74rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.dashboard-heading h1,
.course-identity h1 {
  margin: 0;
  color: var(--class-text);
  font-size: 1.75rem;
  line-height: 1.15;
  font-weight: 820;
  letter-spacing: 0;
}

.dashboard-heading p,
.course-meta {
  max-width: 68ch;
  margin: 8px 0 0;
  color: var(--class-muted);
}

.course-title-line {
  display: flex;
  align-items: center;
  gap: 10px;
}

.course-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 0.94rem;
}

.overall-progress {
  min-width: 230px;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 8px 12px;
  align-items: center;
  color: var(--class-muted);
  font-size: 0.82rem;
}

.overall-progress .progress-track {
  grid-column: 1 / 2;
  height: 7px;
}

.overall-progress strong {
  grid-column: 2 / 3;
  grid-row: 1 / 3;
  color: var(--class-primary-dark);
  font-size: 0.9rem;
}

.dashboard-layout,
.course-workspace-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 22px;
  align-items: start;
}

.dashboard-main-stack,
.course-main-column,
.classroom-right-rail {
  display: grid;
  gap: 18px;
  min-width: 0;
}

.course-main-column {
  grid-template-columns: minmax(0, 1fr);
}

.classroom-panel,
.rail-panel,
.readiness-card {
  border: 1px solid var(--class-line);
  border-radius: var(--class-radius);
  background: var(--class-surface);
  box-shadow: 0 1px 2px oklch(22% 0.03 252 / 0.05);
}

.classroom-panel {
  padding: 18px;
}

.rail-panel {
  display: grid;
  gap: 14px;
  padding: 18px;
}

.rail-panel h2,
.panel-title-row h2,
.panel-title-row h3,
.readiness-card h3,
.intro-grid h3,
.experiment-stage-grid h3 {
  margin: 0;
  color: var(--class-text);
  font-size: 1rem;
  line-height: 1.25;
  font-weight: 780;
}

.rail-panel p,
.panel-title-row p,
.intro-grid p,
.experiment-stage-grid p {
  margin: 6px 0 0;
  color: var(--class-muted);
  font-size: 0.9rem;
}

.panel-title-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 14px;
}

.panel-title-row.slim {
  margin-bottom: 12px;
}

.current-course-header {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 16px;
}

.current-course-header h2 {
  margin: 0;
  font-size: 1.32rem;
}

.current-course-header p {
  margin: 7px 0 0;
  color: var(--class-muted);
}

.classroom-stepper {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  overflow: hidden;
  margin-bottom: 18px;
  border: 1px solid var(--class-line);
  border-radius: var(--class-radius);
  background: var(--class-surface);
}

.classroom-stepper.compact {
  margin: 0 0 18px;
}

.step-segment {
  min-height: 74px;
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 9px 12px;
  align-content: center;
  padding: 12px 16px;
  border: 0;
  border-right: 1px solid var(--class-line);
  background: var(--class-surface);
  color: var(--class-muted);
  text-align: left;
  text-decoration: none;
  cursor: pointer;
}

.step-segment:last-child {
  border-right: 0;
}

.step-segment span {
  grid-row: 1 / 3;
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  border: 1px solid var(--class-line);
  border-radius: 999px;
  background: var(--class-surface-soft);
  color: var(--class-muted);
  font-weight: 800;
}

.step-segment strong {
  overflow: hidden;
  color: var(--class-text);
  font-size: 0.92rem;
  line-height: 1.15;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.step-segment small {
  overflow: hidden;
  color: var(--class-soft);
  font-size: 0.78rem;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.step-segment.is-active {
  background: linear-gradient(180deg, var(--class-primary-soft), oklch(98.5% 0.012 254));
  color: var(--class-primary-dark);
  box-shadow: inset 0 -2px 0 var(--class-primary);
}

.step-segment.is-active span {
  border-color: var(--class-primary);
  background: var(--class-primary);
  color: oklch(99% 0.004 242);
}

.step-segment.is-complete span {
  border-color: oklch(80% 0.06 151);
  background: var(--class-green-soft);
  color: var(--class-green);
}

.dashboard-split,
.course-lower-grid,
.exercise-readiness-layout,
.experiment-stage-grid,
.intro-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 18px;
  align-items: start;
}

.mini-material-list,
.course-overview-list {
  display: grid;
  gap: 8px;
}

.exercise-table-shell {
  min-width: 0;
}

.mini-material-row,
.course-overview-row {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 12px;
  align-items: center;
  min-height: 54px;
  padding: 9px 10px;
  border: 1px solid var(--class-line);
  border-radius: 8px;
  background: var(--class-surface);
  color: var(--class-text);
  text-decoration: none;
}

.course-overview-row {
  grid-template-columns: auto minmax(0, 1fr) auto 150px;
}

.mini-material-row:hover,
.mini-material-row:focus-visible,
.course-overview-row:hover,
.course-overview-row:focus-visible {
  border-color: oklch(78% 0.065 254);
  background: oklch(98.2% 0.014 254);
}

.mini-material-row strong,
.mini-material-row small,
.course-overview-row strong,
.course-overview-row small {
  display: block;
}

.mini-material-row strong,
.course-overview-row strong {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.mini-material-row small,
.course-overview-row small {
  margin-top: 2px;
  color: var(--class-muted);
  font-size: 0.78rem;
}

.progress-cell {
  display: grid;
  grid-template-columns: minmax(70px, 1fr) auto;
  gap: 8px;
  align-items: center;
}

.status-pill,
.type-pill {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  min-height: 24px;
  padding: 4px 8px;
  border: 1px solid var(--class-line);
  border-radius: 7px;
  background: var(--class-surface-soft);
  color: var(--class-muted);
  font-size: 0.75rem;
  font-weight: 760;
}

.status-pill.is-success,
.course-file-icon.is-success {
  border-color: oklch(84% 0.06 151);
  background: var(--class-green-soft);
  color: oklch(42% 0.12 151);
}

.status-pill.is-warning,
.course-file-icon.is-warning {
  border-color: oklch(86% 0.075 78);
  background: var(--class-amber-soft);
  color: oklch(47% 0.12 78);
}

.status-pill.is-danger,
.course-file-icon.is-danger {
  border-color: oklch(86% 0.075 29);
  background: var(--class-red-soft);
  color: var(--class-red);
}

.status-pill.is-info,
.course-file-icon.is-info {
  border-color: oklch(86% 0.055 254);
  background: var(--class-primary-soft);
  color: var(--class-primary-dark);
}

.file-badge {
  width: 34px;
  height: 34px;
  display: inline-grid;
  place-items: center;
  border: 1px solid var(--class-line);
  border-radius: 7px;
  background: var(--class-surface-soft);
  color: var(--class-muted);
  font-family: var(--font-mono);
  font-size: 0.64rem;
  font-weight: 800;
}

.file-badge.is-pdf,
.type-pill.is-pdf {
  border-color: oklch(88% 0.075 29);
  background: var(--class-red-soft);
  color: var(--class-red);
}

.file-badge.is-ppt,
.file-badge.is-pptx,
.type-pill.is-ppt,
.type-pill.is-pptx {
  border-color: oklch(88% 0.075 58);
  background: oklch(95% 0.05 58);
  color: oklch(55% 0.13 58);
}

.file-badge.is-word,
.file-badge.is-doc,
.file-badge.is-docx,
.type-pill.is-word,
.type-pill.is-doc,
.type-pill.is-docx {
  border-color: oklch(86% 0.06 254);
  background: var(--class-primary-soft);
  color: var(--class-primary-dark);
}

.file-badge.is-link,
.type-pill.is-link {
  border-color: oklch(86% 0.06 210);
  background: oklch(94% 0.04 210);
  color: oklch(44% 0.12 210);
}

.classroom-table {
  overflow: hidden;
  border: 1px solid var(--class-line);
  border-radius: 8px;
  background: var(--class-surface);
}

.table-header,
.table-row {
  display: grid;
  align-items: center;
  gap: 12px;
}

.materials-table .table-header,
.materials-table .table-row {
  grid-template-columns: minmax(260px, 1.35fr) 96px minmax(130px, 0.7fr) 104px 96px;
}

.exercise-table .table-header,
.exercise-table .table-row {
  grid-template-columns: minmax(250px, 1.3fr) 130px 130px 90px 70px;
}

.table-header {
  min-height: 36px;
  padding: 0 14px;
  border-bottom: 1px solid var(--class-line);
  background: var(--class-surface-soft);
  color: var(--class-muted);
  font-size: 0.76rem;
  font-weight: 780;
}

.table-row {
  min-height: 60px;
  padding: 10px 14px;
  border-bottom: 1px solid var(--class-line);
  color: var(--class-muted);
  font-size: 0.86rem;
}

.table-row:last-child {
  border-bottom: 0;
}

.table-row strong,
.table-row small {
  display: block;
}

.table-row strong {
  color: var(--class-text);
  font-size: 0.88rem;
  font-weight: 720;
}

.table-row small {
  margin-top: 2px;
  color: var(--class-soft);
  font-size: 0.76rem;
}

.resource-name {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 10px;
  align-items: center;
}

.row-actions,
.table-actions {
  display: flex;
  align-items: center;
  gap: 7px;
}

.readiness-card {
  display: grid;
  gap: 12px;
  padding: 18px;
}

.readiness-card ul {
  display: grid;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  color: var(--class-muted);
  font-size: 0.86rem;
}

.readiness-card li {
  display: flex;
  align-items: center;
  gap: 8px;
}

.check-dot {
  width: 10px;
  height: 10px;
  border: 1px solid var(--class-line-strong);
  border-radius: 999px;
  background: var(--class-surface);
}

.check-dot.is-success {
  border-color: var(--class-green);
  background: var(--class-green);
}

.check-dot.is-warning {
  border-color: var(--class-amber);
  background: var(--class-amber);
}

.experiment-dock {
  display: grid;
  gap: 14px;
  padding: 18px;
  border: 1px solid var(--class-dark-line);
  border-radius: 8px;
  background:
    radial-gradient(circle at 82% 0%, oklch(64% 0.12 218 / 0.18), transparent 18rem),
    linear-gradient(180deg, var(--class-dark-2), var(--class-dark));
  color: oklch(95% 0.014 242);
  box-shadow: 0 14px 32px oklch(20% 0.035 248 / 0.18);
}

.dock-title {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 14px;
}

.dock-title strong {
  font-size: 0.98rem;
}

.dock-title small {
  color: oklch(78% 0.025 242);
}

.dock-icon {
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  border-radius: 7px;
  background: oklch(96% 0.012 242 / 0.1);
  color: oklch(94% 0.04 210);
  font-family: var(--font-mono);
  font-weight: 800;
}

.dock-grid {
  display: grid;
  grid-template-columns: minmax(140px, 1fr) minmax(140px, 1fr) repeat(4, minmax(88px, 0.7fr)) minmax(150px, 1fr) auto;
  gap: 10px;
  align-items: end;
}

.dock-grid label,
.dock-stat {
  min-height: 54px;
  display: grid;
  gap: 6px;
  padding: 8px 10px;
  border: 1px solid var(--class-dark-line);
  border-radius: 7px;
  background: oklch(16.5% 0.03 248 / 0.76);
}

.dock-grid label span,
.dock-stat span {
  color: oklch(76% 0.025 242);
  font-size: 0.72rem;
}

.dock-grid select {
  min-width: 0;
  border: 0;
  background: transparent;
  color: oklch(96% 0.012 242);
  font: 700 0.82rem/1.2 var(--font-sans);
}

.dock-stat strong {
  color: oklch(97% 0.012 242);
  font-size: 0.9rem;
}

.dock-grid .button {
  min-height: 54px;
  white-space: nowrap;
}

.instructor-card,
.assignment-card {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 10px;
  align-items: center;
}

.instructor-card strong,
.instructor-card small,
.assignment-card strong,
.assignment-card small {
  display: block;
}

.instructor-card small,
.assignment-card small {
  color: var(--class-soft);
  font-size: 0.78rem;
}

.assignment-card {
  padding: 10px;
  border: 1px solid var(--class-line);
  border-radius: 8px;
  background: var(--class-surface-soft);
}

.due-text {
  color: var(--class-red) !important;
  font-weight: 720;
}

.readiness-list {
  display: grid;
  gap: 0;
  margin: 0;
}

.readiness-list div {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 8px 0;
  border-bottom: 1px solid var(--class-line);
}

.readiness-list div:last-child {
  border-bottom: 0;
}

.readiness-list dt {
  color: var(--class-muted);
}

.readiness-list dd {
  margin: 0;
  color: var(--class-green);
  font-weight: 760;
}

.text-link {
  color: var(--class-primary-dark);
  font-size: 0.86rem;
  font-weight: 760;
  text-decoration: none;
}

.text-link:hover,
.text-link:focus-visible {
  text-decoration: underline;
}

.full-width {
  width: 100%;
}

.intro-grid article,
.experiment-stage-grid article {
  padding: 16px;
  border: 1px solid var(--class-line);
  border-radius: 8px;
  background: var(--class-surface-soft);
}

.intro-grid ol {
  display: grid;
  gap: 7px;
  margin: 8px 0 0;
  padding-left: 20px;
  color: var(--class-muted);
}

@media (max-width: 1280px) {
  .classroom-shell {
    grid-template-columns: 260px minmax(0, 1fr);
  }

  .dashboard-layout,
  .course-workspace-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .classroom-right-rail {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .dock-grid {
    grid-template-columns: repeat(4, minmax(120px, 1fr));
  }
}

@media (max-width: 980px) {
  .classroom-shell {
    grid-template-columns: 1fr;
  }

  .classroom-sidebar {
    position: relative;
    height: auto;
    max-height: none;
    border-right: 0;
    border-bottom: 1px solid var(--class-line);
  }

  .classroom-nav {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .course-menu-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .classroom-topbar {
    position: relative;
  }

  .classroom-search {
    width: min(420px, 46vw);
  }

  .dashboard-split,
  .course-lower-grid,
  .exercise-readiness-layout,
  .experiment-stage-grid,
  .intro-grid,
  .classroom-right-rail {
    grid-template-columns: 1fr;
  }

  .classroom-stepper {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  .classroom-sidebar,
  .classroom-content,
  .classroom-topbar {
    padding: 16px;
  }

  .classroom-sidebar {
    gap: 14px;
  }

  .classroom-brand {
    grid-template-columns: 36px minmax(0, 1fr);
    padding-bottom: 4px;
  }

  .brand-mark {
    width: 34px;
    height: 34px;
  }

  .classroom-topbar,
  .dashboard-heading,
  .course-identity,
  .panel-title-row,
  .current-course-header {
    align-items: flex-start;
    flex-direction: column;
  }

  .topbar-tools {
    width: 100%;
    flex-wrap: wrap;
  }

  .classroom-search {
    order: 2;
    width: 100%;
  }

  .classroom-stepper {
    grid-template-columns: 1fr;
  }

  .classroom-nav {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .classroom-nav-link {
    min-height: 38px;
    padding: 7px 8px;
    font-size: 0.9rem;
  }

  .course-menu-list {
    display: flex;
    gap: 8px;
    overflow-x: auto;
    padding-bottom: 4px;
    scroll-snap-type: x proximity;
    scrollbar-width: none;
  }

  .course-menu-list::-webkit-scrollbar {
    display: none;
  }

  .course-menu-item {
    min-width: 220px;
    scroll-snap-align: start;
  }

  .overall-progress {
    width: 100%;
    min-width: 0;
  }

  .course-overview-row,
  .mini-material-row {
    grid-template-columns: auto minmax(0, 1fr);
  }

  .course-overview-row .status-pill,
  .course-overview-row .progress-cell,
  .mini-material-row .status-pill {
    grid-column: 2 / -1;
  }

  .classroom-table {
    border: 0;
    background: transparent;
  }

  .table-header {
    display: none;
  }

  .materials-table .table-row,
  .exercise-table .table-row {
    grid-template-columns: 1fr;
    gap: 8px;
    margin-bottom: 10px;
    padding: 12px;
    border: 1px solid var(--class-line);
    border-radius: 8px;
    background: var(--class-surface);
  }

  .table-row > span {
    display: grid;
    gap: 4px;
  }

  .table-row > span::before {
    content: attr(data-label);
    color: var(--class-soft);
    font-size: 0.72rem;
    font-weight: 780;
  }

  .resource-name {
    grid-template-columns: auto minmax(0, 1fr);
  }

  .dock-grid {
    grid-template-columns: 1fr;
  }

  .dock-grid .button,
  .table-actions,
  .panel-title-row .ghost-button,
  .panel-title-row .button {
    width: 100%;
  }

  .dashboard-heading h1,
  .course-identity h1 {
    font-size: 1.5rem;
  }
}

/* Screenshot-aligned course workspace pass */

body.student-classroom {
  background: oklch(98.8% 0.005 247);
}

.student-classroom svg {
  width: 18px;
  height: 18px;
  display: block;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.9;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.student-classroom .classroom-shell {
  grid-template-columns: 328px minmax(0, 1fr);
}

.student-classroom .classroom-sidebar {
  gap: 24px;
  padding: 18px 12px 20px;
  background: oklch(98.6% 0.008 247);
  box-shadow: inset -1px 0 0 var(--class-line);
}

.student-classroom .classroom-brand {
  grid-template-columns: 42px minmax(0, 1fr);
  padding: 0 8px 14px;
}

.student-classroom .brand-mark {
  width: 40px;
  height: 40px;
  border-radius: 8px;
  background: linear-gradient(180deg, oklch(57% 0.2 254), oklch(49% 0.2 254));
  font-size: 0.64rem;
  letter-spacing: -0.03em;
  box-shadow: inset 0 0 0 1px oklch(70% 0.12 254 / 0.34);
}

.student-classroom .classroom-brand strong {
  font-size: 1.04rem;
  font-weight: 780;
}

.student-classroom .classroom-brand small {
  color: oklch(44% 0.035 247);
  font-size: 0.76rem;
}

.student-classroom .classroom-nav {
  gap: 8px;
  padding: 0 0 8px;
}

.student-classroom .classroom-nav-link {
  min-height: 44px;
  padding: 8px 12px;
  border-radius: 8px;
  color: oklch(38% 0.04 247);
  font-size: 0.94rem;
  font-weight: 560;
}

.student-classroom .classroom-nav-link.is-active {
  background: oklch(94.5% 0.04 254);
  color: oklch(45% 0.18 254);
}

.student-classroom .nav-icon,
.student-classroom .course-file-icon {
  width: 28px;
  height: 28px;
  border-color: transparent;
  background: transparent;
  color: inherit;
}

.student-classroom .nav-count {
  margin-left: auto;
  background: oklch(54% 0.19 254);
}

.student-classroom .classroom-course-menu {
  gap: 8px;
  padding-top: 18px;
  border-top: 1px solid var(--class-line);
}

.student-classroom .course-menu-heading {
  padding: 0 12px;
  font-size: 0.92rem;
}

.student-classroom .pinned-label {
  margin: 4px 12px 0;
  color: oklch(52% 0.03 247);
  font-size: 0.68rem;
  font-weight: 780;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.student-classroom .pinned-label::before {
  content: "⌄ ";
}

.student-classroom .course-menu-list {
  gap: 7px;
}

.student-classroom .course-menu-item {
  min-height: 60px;
  padding: 9px 12px;
  border-radius: 8px;
  color: oklch(34% 0.035 247);
}

.student-classroom .course-menu-item.is-active {
  background: oklch(92.8% 0.048 254);
  color: oklch(45% 0.18 254);
}

.student-classroom .course-file-icon {
  border: 1px solid currentColor;
  background: oklch(99.2% 0.004 247);
}

.student-classroom .course-file-icon svg {
  width: 17px;
  height: 17px;
}

.student-classroom .course-color-1 {
  color: oklch(55% 0.19 254);
}

.student-classroom .course-color-2,
.student-classroom .course-color-3 {
  color: oklch(52% 0.14 151);
}

.student-classroom .course-color-4,
.student-classroom .course-color-5 {
  color: oklch(62% 0.15 78);
}

.student-classroom .course-color-6 {
  color: oklch(50% 0.18 280);
}

.student-classroom .classroom-sidebar-footer {
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  padding: 16px 0 0;
}

.student-classroom .classroom-sidebar-footer .classroom-nav-link {
  justify-content: start;
  min-height: 38px;
}

.student-classroom .classroom-topbar {
  min-height: 64px;
  padding: 0 30px;
  background: oklch(99.5% 0.004 247);
}

.student-classroom .breadcrumb {
  font-size: 0.92rem;
}

.student-classroom .breadcrumb a {
  color: oklch(48% 0.19 254);
}

.student-classroom .topbar-tools {
  gap: 18px;
}

.student-classroom .classroom-search {
  width: min(420px, 32vw);
  grid-template-columns: auto minmax(0, 1fr) auto;
  min-height: 40px;
  padding: 0 10px 0 14px;
}

.student-classroom .classroom-search > svg {
  width: 17px;
  height: 17px;
  color: oklch(61% 0.025 247);
}

.student-classroom .topbar-icon {
  border: 0;
  background: transparent;
  color: oklch(26% 0.035 247);
}

.student-classroom .profile-chip {
  gap: 8px;
  padding-left: 18px;
  border-left: 1px solid var(--class-line);
}

.student-classroom .profile-chip strong {
  font-size: 0.88rem;
}

.student-classroom .profile-chip > svg {
  width: 14px;
  height: 14px;
}

.student-classroom .photo-avatar {
  position: relative;
  background:
    radial-gradient(circle at 45% 30%, oklch(86% 0.045 58) 0 18%, transparent 19%),
    radial-gradient(circle at 50% 82%, oklch(36% 0.07 32) 0 30%, transparent 31%),
    linear-gradient(135deg, oklch(83% 0.06 40), oklch(60% 0.04 250));
}

.student-classroom .photo-avatar::after {
  content: "";
  position: absolute;
  right: -1px;
  bottom: -1px;
  width: 8px;
  height: 8px;
  border: 2px solid oklch(99.5% 0.004 247);
  border-radius: 999px;
  background: oklch(56% 0.15 151);
}

.student-classroom .classroom-content {
  width: 100%;
  max-width: none;
  padding: 34px 34px 28px 30px;
}

.student-classroom .course-identity {
  align-items: flex-start;
  margin-bottom: 22px;
}

.student-classroom .course-identity h1 {
  font-size: 1.82rem;
  letter-spacing: 0;
}

.student-classroom .star-button {
  width: 34px;
  height: 34px;
  border: 0;
  background: transparent;
  color: oklch(64% 0.035 247);
}

.student-classroom .course-meta {
  gap: 10px;
  margin-top: 8px;
  color: oklch(48% 0.035 247);
}

.student-classroom .overall-progress {
  min-width: 250px;
  margin-top: 12px;
}

.student-classroom .progress-track {
  height: 7px;
  background: oklch(90% 0.012 247);
}

.student-classroom .progress-track span {
  background: oklch(53% 0.19 254);
}

.student-classroom .classroom-stepper {
  margin-bottom: 0;
  margin-right: 366px;
  border-radius: 8px 8px 0 0;
}

.student-classroom .step-segment {
  position: relative;
  min-height: 78px;
  grid-template-columns: 38px minmax(0, 1fr);
  padding: 14px 30px 14px 30px;
  overflow: visible;
}

.student-classroom .step-segment > * {
  position: relative;
  z-index: 3;
}

.student-classroom .step-segment:not(:last-child)::after {
  content: none;
  display: none;
}

.student-classroom .step-segment span {
  width: 32px;
  height: 32px;
  font-size: 0.92rem;
}

.student-classroom .step-segment strong {
  font-size: 0.95rem;
}

.student-classroom .step-segment small {
  font-size: 0.78rem;
}

.student-classroom .step-segment.is-complete span::after {
  content: "";
  width: 8px;
  height: 8px;
  margin-left: 10px;
  border-radius: 999px;
  background: oklch(52% 0.14 151);
}

.student-classroom .course-workspace-grid {
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: 26px;
  padding: 22px 0 0;
  border: 1px solid var(--class-line);
  border-top: 0;
  border-radius: 0 0 8px 8px;
  background: oklch(99.2% 0.004 247);
}

.student-classroom .course-main-column {
  gap: 18px;
  padding: 0 0 26px 30px;
}

.student-classroom .classroom-right-rail {
  gap: 24px;
  margin-top: -101px;
  padding: 0 24px 26px 0;
}

.student-classroom .classroom-panel {
  padding: 0;
  border: 0;
  background: transparent;
  box-shadow: none;
}

.student-classroom .panel-title-row {
  margin-bottom: 14px;
}

.student-classroom .panel-title-row h2 {
  font-size: 1.04rem;
}

.student-classroom .panel-title-row p {
  font-size: 0.86rem;
}

.student-classroom .table-actions .ghost-button {
  min-width: 114px;
  min-height: 40px;
  border-radius: 8px;
}

.student-classroom .classroom-table {
  border-radius: 8px;
}

.student-classroom .materials-table .table-header,
.student-classroom .materials-table .table-row {
  grid-template-columns: minmax(330px, 1.45fr) 110px minmax(150px, 0.75fr) 120px 98px;
}

.student-classroom .exercise-table .table-header,
.student-classroom .exercise-table .table-row {
  grid-template-columns: minmax(280px, 1.4fr) 135px 150px 90px 56px;
}

.student-classroom .table-header {
  min-height: 36px;
  padding: 0 18px;
}

.student-classroom .table-row {
  min-height: 62px;
  padding: 10px 18px;
}

.student-classroom .exercise-table .table-row {
  min-height: 42px;
  padding: 6px 18px;
}

.student-classroom .exercise-table .table-row > span:first-child {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.student-classroom .exercise-table .table-row strong,
.student-classroom .exercise-table .table-row small {
  margin-top: 0;
}

.student-classroom .resource-name {
  gap: 14px;
}

.student-classroom .file-badge {
  width: 34px;
  height: 34px;
  border-radius: 6px;
  font-size: 0.62rem;
}

.student-classroom .type-pill,
.student-classroom .status-pill {
  min-height: 26px;
  border-radius: 7px;
}

.student-classroom .status-pill.is-neutral {
  border-color: oklch(84% 0.012 247);
  background: oklch(94% 0.006 247);
  color: oklch(45% 0.02 247);
}

.student-classroom .row-actions .icon-button {
  border: 0;
  background: transparent;
  color: oklch(45% 0.04 247);
}

.student-classroom .course-lower-grid {
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 34px;
  align-items: start;
}

.student-classroom .exercise-readiness-panel {
  display: grid;
  gap: 13px;
}

.student-classroom .exercise-readiness-title {
  align-items: center;
  margin-bottom: 0;
}

.student-classroom .exercise-readiness-layout {
  grid-template-columns: minmax(0, 1fr) minmax(340px, 360px);
  gap: 24px;
  align-items: stretch;
}

.student-classroom .exercise-readiness-layout .experiment-readiness-card {
  min-height: 100%;
  align-content: start;
}

.student-classroom .course-lower-grid > .classroom-panel {
  padding-top: 2px;
}

.student-classroom .readiness-card {
  padding: 22px 24px;
}

.student-classroom .readiness-card h3 {
  font-size: 0.95rem;
}

.student-classroom .experiment-readiness-card {
  gap: 14px;
  padding: 18px;
  background:
    linear-gradient(180deg, oklch(99.4% 0.006 247), oklch(97.8% 0.01 247));
}

.student-classroom .readiness-card-header {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 12px;
  align-items: start;
}

.student-classroom .readiness-card-header h3 {
  margin: 0;
  font-size: 0.98rem;
  line-height: 1.16;
}

.student-classroom .readiness-card-header p {
  max-width: 28ch;
  margin: 4px 0 0;
  color: var(--class-muted);
  font-size: 0.78rem;
  line-height: 1.28;
}

.student-classroom .readiness-card-header > strong {
  min-width: 48px;
  padding: 4px 8px;
  border: 1px solid oklch(84% 0.055 254);
  border-radius: 999px;
  background: var(--class-primary-soft);
  color: var(--class-primary-dark);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  line-height: 1;
  text-align: center;
}

.student-classroom .experiment-readiness-card ul {
  gap: 7px;
  padding: 10px 0;
  border-top: 1px solid var(--class-line);
  border-bottom: 1px solid var(--class-line);
}

.student-classroom .experiment-readiness-card li {
  display: grid;
  grid-template-columns: 14px minmax(0, 1fr);
  gap: 8px;
  align-items: center;
  color: oklch(35% 0.035 247);
  font-size: 0.82rem;
  line-height: 1.22;
}

.student-classroom .experiment-readiness-card .check-dot {
  width: 9px;
  height: 9px;
  justify-self: center;
}

.student-classroom .readiness-progress-row {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 10px;
  align-items: center;
  color: var(--class-muted);
  font-size: 0.76rem;
}

.student-classroom .readiness-progress-row .progress-track {
  height: 6px;
}

.student-classroom .readiness-progress-row span:last-child {
  color: var(--class-primary-dark);
  font-weight: 600;
}

.student-classroom .rail-panel {
  gap: 14px;
  padding: 22px 24px;
  border-radius: 8px;
  background: oklch(99.5% 0.004 247);
}

.student-classroom .rail-panel h2 {
  font-size: 1rem;
}

.student-classroom .assignment-card {
  min-height: 58px;
  border-color: transparent;
  background: oklch(94.8% 0.024 247);
}

.student-classroom .instructor-card {
  margin-top: 4px;
}

.student-classroom .instructor-card .avatar {
  width: 42px;
  height: 42px;
}

.student-classroom .instructor-card .avatar.is-soft {
  background:
    radial-gradient(circle at 45% 30%, oklch(88% 0.05 50) 0 18%, transparent 19%),
    radial-gradient(circle at 50% 82%, oklch(38% 0.07 34) 0 30%, transparent 31%),
    linear-gradient(135deg, oklch(83% 0.06 40), oklch(58% 0.04 250));
  color: transparent;
}

.student-classroom .readiness-list div {
  padding: 9px 0;
}

.student-classroom .experiment-dock {
  margin-top: 14px;
  padding: 16px 20px 20px;
  border-radius: 8px;
}

.student-classroom .dock-title {
  min-height: 30px;
}

.student-classroom .dock-grid {
  grid-template-columns: 150px 150px 94px 106px 116px 92px minmax(160px, 1fr) 170px;
  gap: 12px;
}

.student-classroom .dock-grid label,
.student-classroom .dock-stat {
  min-height: 56px;
  padding: 9px 12px;
}

.student-classroom .dock-stat strong {
  display: flex;
  align-items: center;
  gap: 8px;
}

.student-classroom .dock-stat strong svg {
  width: 17px;
  height: 17px;
  color: oklch(82% 0.045 210);
}

@media (max-width: 1280px) {
  .student-classroom .classroom-shell {
    grid-template-columns: 286px minmax(0, 1fr);
  }

  .student-classroom .course-workspace-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .student-classroom .classroom-stepper {
    margin-right: 0;
  }

  .student-classroom .course-main-column {
    padding-right: 30px;
  }

  .student-classroom .classroom-right-rail {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    margin-top: 0;
    padding-left: 30px;
  }

  .student-classroom .dock-grid {
    grid-template-columns: repeat(4, minmax(120px, 1fr));
  }
}

@media (max-width: 980px) {
  .student-classroom .classroom-shell {
    grid-template-columns: 1fr;
  }

  .student-classroom .classroom-content {
    padding: 24px 18px;
  }

  .student-classroom .course-workspace-grid {
    padding-top: 18px;
  }

  .student-classroom .course-main-column,
  .student-classroom .classroom-right-rail {
    margin-top: 0;
    padding: 0 18px 18px;
  }
}

@media (max-width: 720px) {
  html,
  body.student-classroom {
    overflow-x: hidden;
  }

  .student-classroom .classroom-sidebar {
    gap: 14px;
    padding: 16px;
  }

  .student-classroom .classroom-course-menu {
    min-width: 0;
    overflow: hidden;
  }

  .student-classroom .course-menu-list {
    width: 100%;
    max-width: 100%;
    overflow-x: auto;
    overflow-y: hidden;
  }

  .student-classroom .classroom-topbar {
    min-height: auto;
    padding: 16px;
  }

  .student-classroom .classroom-search {
    width: 100%;
  }

  .student-classroom .course-workspace-grid {
    border: 0;
    background: transparent;
  }

  .student-classroom .classroom-stepper {
    border-radius: 8px;
  }

  .student-classroom .step-segment:not(:last-child)::after {
    display: none;
  }

  .student-classroom .materials-table .table-row,
  .student-classroom .exercise-table .table-row {
    grid-template-columns: 1fr;
  }
}

/* Complete student navigation pages */

.student-classroom .pinned-label::before {
  content: ">";
  margin-right: 4px;
}

.student-dashboard .classroom-panel,
.student-dashboard .rail-panel,
.student-calendar .classroom-panel,
.student-calendar .rail-panel,
.student-messages .classroom-panel,
.student-grades .classroom-panel,
.student-grades .rail-panel {
  border: 1px solid var(--class-line);
  border-radius: var(--class-radius);
  background: var(--class-surface);
  box-shadow: 0 1px 2px oklch(22% 0.03 252 / 0.05);
}

.student-dashboard .classroom-panel,
.student-calendar .classroom-panel,
.student-messages .classroom-panel,
.student-grades .classroom-panel {
  padding: 22px;
}

.student-dashboard .rail-panel,
.student-calendar .rail-panel,
.student-grades .rail-panel {
  gap: 14px;
  margin: 0;
  padding: 22px;
}

.student-dashboard .classroom-right-rail,
.student-calendar .classroom-right-rail,
.student-grades .classroom-right-rail {
  gap: 22px;
  margin-top: 0;
  padding: 0;
}

.student-dashboard .dashboard-layout,
.student-calendar .dashboard-layout,
.student-grades .dashboard-layout {
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: 26px;
}

.dashboard-metric-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
  margin-bottom: 22px;
}

.metric-tile {
  min-height: 118px;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 8px 12px;
  align-content: center;
  padding: 18px;
  border: 1px solid var(--class-line);
  border-radius: 8px;
  background: var(--class-surface);
  color: var(--class-muted);
}

.metric-tile strong {
  grid-column: 2;
  color: var(--class-text);
  font-size: 1.6rem;
  line-height: 1;
}

.metric-tile small {
  grid-column: 2;
  font-size: 0.78rem;
}

.metric-icon {
  width: 38px;
  height: 38px;
  display: grid;
  grid-row: 1 / 4;
  place-items: center;
  border-radius: 8px;
  background: var(--class-primary-soft);
  color: var(--class-primary-dark);
}

.metric-icon.is-dark {
  background: oklch(18% 0.036 248);
  color: oklch(92% 0.02 215);
}

.dashboard-current-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(280px, 0.8fr);
  gap: 16px;
}

.next-task-block,
.lab-entry-block {
  display: grid;
  gap: 12px;
  padding: 18px;
  border: 1px solid var(--class-line);
  border-radius: 8px;
  background: var(--class-surface-soft);
}

.next-task-block h3,
.lab-entry-block h3 {
  margin: 0;
  color: var(--class-text);
  font-size: 1.12rem;
}

.next-task-block p,
.lab-entry-block p {
  margin: 0;
  color: var(--class-muted);
  font-size: 0.9rem;
}

.lab-entry-block {
  justify-content: space-between;
  background:
    radial-gradient(circle at 92% 4%, oklch(64% 0.12 218 / 0.18), transparent 12rem),
    linear-gradient(180deg, var(--class-dark-2), var(--class-dark));
  color: oklch(95% 0.014 242);
}

.lab-entry-block h3 {
  color: oklch(98% 0.008 242);
}

.lab-entry-block p {
  color: oklch(77% 0.025 242);
}

.task-meta-line {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.task-meta-line span {
  min-height: 28px;
  display: inline-flex;
  align-items: center;
  padding: 4px 9px;
  border: 1px solid var(--class-line);
  border-radius: 7px;
  background: var(--class-surface);
  color: var(--class-muted);
  font-size: 0.78rem;
  font-weight: 720;
}

.agenda-list,
.compact-list,
.message-digest-list {
  display: grid;
  gap: 10px;
}

.agenda-row,
.compact-list a,
.message-digest-list a {
  display: grid;
  grid-template-columns: 72px auto minmax(0, 1fr);
  gap: 12px;
  align-items: center;
  min-height: 58px;
  padding: 10px 0;
  border-bottom: 1px solid var(--class-line);
  color: var(--class-text);
  text-decoration: none;
}

.agenda-row:last-child,
.compact-list a:last-child,
.message-digest-list a:last-child {
  border-bottom: 0;
}

.agenda-row time {
  color: var(--class-primary-dark);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 760;
}

.agenda-row strong,
.compact-list strong,
.message-digest-list strong {
  display: block;
  color: var(--class-text);
  font-size: 0.9rem;
}

.agenda-row small,
.compact-list span,
.message-digest-list span {
  display: block;
  margin-top: 2px;
  color: var(--class-muted);
  font-size: 0.78rem;
}

.compact-list a,
.message-digest-list a {
  grid-template-columns: 1fr;
  padding: 10px 0;
}

.calendar-month-label,
.message-summary-pill {
  min-width: 130px;
  display: grid;
  justify-items: end;
  gap: 2px;
  color: var(--class-muted);
}

.calendar-month-label strong,
.message-summary-pill strong {
  color: var(--class-primary-dark);
  font-size: 1.48rem;
  line-height: 1;
}

.calendar-month-grid {
  display: grid;
  grid-template-columns: repeat(7, minmax(112px, 1fr));
  overflow: hidden;
  border: 1px solid var(--class-line);
  border-radius: 8px;
}

.calendar-weekday {
  min-height: 36px;
  display: grid;
  place-items: center;
  border-right: 1px solid var(--class-line);
  border-bottom: 1px solid var(--class-line);
  background: var(--class-surface-soft);
  color: var(--class-muted);
  font-size: 0.74rem;
  font-weight: 780;
}

.calendar-weekday:nth-child(7) {
  border-right: 0;
}

.calendar-day {
  min-height: 122px;
  display: grid;
  align-content: start;
  gap: 7px;
  padding: 10px;
  border-right: 1px solid var(--class-line);
  border-bottom: 1px solid var(--class-line);
  background: var(--class-surface);
}

.calendar-day:nth-child(7n) {
  border-right: 0;
}

.calendar-day.is-muted {
  background: oklch(96.8% 0.006 247);
  color: var(--class-soft);
}

.calendar-day > span {
  color: var(--class-muted);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 760;
}

.calendar-event {
  display: grid;
  gap: 2px;
  padding: 7px;
  border: 1px solid var(--class-line);
  border-radius: 7px;
  background: var(--class-primary-soft);
  color: var(--class-primary-dark);
  text-decoration: none;
}

.calendar-event.is-success {
  border-color: oklch(84% 0.06 151);
  background: var(--class-green-soft);
  color: oklch(42% 0.12 151);
}

.calendar-event.is-warning {
  border-color: oklch(86% 0.075 78);
  background: var(--class-amber-soft);
  color: oklch(47% 0.12 78);
}

.calendar-event.is-danger {
  border-color: oklch(86% 0.075 29);
  background: var(--class-red-soft);
  color: var(--class-red);
}

.calendar-event strong,
.calendar-event small {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.calendar-event strong {
  font-size: 0.72rem;
}

.calendar-event small {
  font-size: 0.7rem;
}

.message-workspace {
  display: grid;
  grid-template-columns: 410px minmax(0, 1fr);
  gap: 26px;
  align-items: start;
}

.message-list {
  display: grid;
  gap: 8px;
}

.message-row {
  width: 100%;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 12px;
  align-items: center;
  min-height: 72px;
  padding: 12px;
  border: 1px solid var(--class-line);
  border-radius: 8px;
  background: var(--class-surface);
  color: var(--class-text);
  text-align: left;
  cursor: pointer;
}

.message-row.is-active,
.message-row:hover,
.message-row:focus-visible {
  border-color: oklch(78% 0.065 254);
  background: var(--class-primary-soft);
}

.message-row strong,
.message-row small {
  display: block;
}

.message-row strong {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.message-row small {
  margin-top: 3px;
  color: var(--class-muted);
  font-size: 0.78rem;
}

.message-avatar {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border-radius: 999px;
  background: var(--class-text);
  color: oklch(99% 0.004 242);
  font-weight: 800;
}

.message-avatar.is-large {
  width: 54px;
  height: 54px;
  font-size: 1rem;
}

.message-row-meta {
  display: grid;
  justify-items: end;
  gap: 6px;
}

.unread-dot {
  width: 8px;
  height: 8px;
  border-radius: 999px;
  background: var(--class-primary);
}

.message-detail-panel {
  min-height: 520px;
  display: grid;
  align-content: start;
  gap: 22px;
}

.message-detail-header {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: start;
}

.message-detail-header h2 {
  margin: 8px 0 4px;
  color: var(--class-text);
  font-size: 1.34rem;
}

.message-detail-header p,
.message-body p,
.message-context h3 {
  margin: 0;
  color: var(--class-muted);
}

.message-body {
  max-width: 70ch;
  padding: 18px 0;
  border-top: 1px solid var(--class-line);
  border-bottom: 1px solid var(--class-line);
}

.message-body p {
  font-size: 1rem;
  line-height: 1.58;
}

.message-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.message-context {
  display: grid;
  gap: 12px;
  padding: 16px;
  border: 1px solid var(--class-line);
  border-radius: 8px;
  background: var(--class-surface-soft);
}

.gradebook-table .table-header,
.gradebook-table .table-row {
  grid-template-columns: minmax(260px, 1.4fr) 140px 140px 90px 110px;
}

@media (max-width: 1280px) {
  .student-dashboard .dashboard-layout,
  .student-calendar .dashboard-layout,
  .student-grades .dashboard-layout,
  .message-workspace {
    grid-template-columns: minmax(0, 1fr);
  }

  .dashboard-metric-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .calendar-month-grid {
    grid-template-columns: repeat(7, minmax(92px, 1fr));
  }
}

@media (max-width: 1560px) and (min-width: 1281px) {
  body.student-classroom:not(.student-dashboard):not(.student-calendar):not(.student-messages):not(.student-grades) .course-workspace-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  body.student-classroom:not(.student-dashboard):not(.student-calendar):not(.student-messages):not(.student-grades) .classroom-stepper {
    margin-right: 0;
  }

  body.student-classroom:not(.student-dashboard):not(.student-calendar):not(.student-messages):not(.student-grades) .course-main-column {
    padding-right: 30px;
  }

  body.student-classroom:not(.student-dashboard):not(.student-calendar):not(.student-messages):not(.student-grades) .classroom-right-rail {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    margin-top: 0;
    padding: 0 30px 26px;
  }

  body.student-classroom:not(.student-dashboard):not(.student-calendar):not(.student-messages):not(.student-grades) .dock-grid {
    grid-template-columns: repeat(4, minmax(120px, 1fr));
  }
}

@media (max-width: 980px) {
  .student-dashboard .classroom-right-rail,
  .student-calendar .classroom-right-rail,
  .student-grades .classroom-right-rail {
    grid-template-columns: 1fr;
    padding: 0;
  }

  .dashboard-current-grid {
    grid-template-columns: 1fr;
  }

  .calendar-month-grid {
    overflow-x: auto;
    grid-template-columns: repeat(7, minmax(116px, 1fr));
  }
}

@media (max-width: 720px) {
  .student-dashboard .classroom-panel,
  .student-calendar .classroom-panel,
  .student-messages .classroom-panel,
  .student-grades .classroom-panel,
  .student-dashboard .rail-panel,
  .student-calendar .rail-panel,
  .student-grades .rail-panel {
    padding: 16px;
  }

  .dashboard-metric-grid {
    grid-template-columns: 1fr;
  }

  .metric-tile {
    min-height: 96px;
  }

  .agenda-row {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .message-row {
    grid-template-columns: auto minmax(0, 1fr);
  }

  .message-row-meta {
    grid-column: 2;
    justify-items: start;
  }

  .message-detail-header {
    grid-template-columns: 1fr;
  }

  .calendar-month-label,
  .message-summary-pill {
    justify-items: start;
  }

  .gradebook-table .table-row {
    grid-template-columns: 1fr;
  }
}

/* Layout, typeset, colorize refinement pass */

body.student-classroom {
  --class-bg: oklch(98.4% 0.008 238);
  --class-sidebar: oklch(97.4% 0.012 238);
  --class-surface: oklch(99.6% 0.005 238);
  --class-surface-soft: oklch(96.5% 0.013 238);
  --class-line: oklch(88.2% 0.016 238);
  --class-line-strong: oklch(76% 0.035 238);
  --class-text: oklch(20% 0.034 248);
  --class-muted: oklch(44.5% 0.035 248);
  --class-soft: oklch(57% 0.03 248);
  --class-primary: oklch(54% 0.19 254);
  --class-primary-dark: oklch(40% 0.17 254);
  --class-primary-soft: oklch(94.2% 0.044 254);
  --class-lab: oklch(52% 0.13 214);
  --class-lab-soft: oklch(94.5% 0.04 214);
  --class-message: oklch(50% 0.15 292);
  --class-message-soft: oklch(94.6% 0.046 292);
  --class-calendar: oklch(58% 0.13 73);
  --class-calendar-soft: oklch(95% 0.048 73);
  --class-grade: oklch(49% 0.12 151);
  --class-grade-soft: oklch(94.5% 0.045 151);
  font-kerning: normal;
  font-feature-settings: "liga" 1, "kern" 1;
  line-height: 1.48;
  background:
    linear-gradient(180deg, oklch(99.3% 0.006 238), oklch(97.6% 0.012 238));
}

.student-classroom .classroom-content {
  padding-top: 36px;
}

.student-dashboard .classroom-content,
.student-calendar .classroom-content,
.student-messages .classroom-content,
.student-grades .classroom-content {
  width: min(1508px, 100%);
  padding: 38px 40px 36px;
}

.student-classroom .dashboard-heading,
.student-classroom .course-identity {
  gap: 32px;
  margin-bottom: 28px;
}

.student-dashboard .dashboard-heading,
.student-calendar .dashboard-heading,
.student-messages .dashboard-heading,
.student-grades .dashboard-heading {
  align-items: flex-start;
}

.student-classroom .section-kicker {
  margin-bottom: 7px;
  color: var(--class-primary-dark);
  font-size: 0.72rem;
  line-height: 1;
  letter-spacing: 0.105em;
}

.student-dashboard .dashboard-heading h1,
.student-calendar .dashboard-heading h1,
.student-messages .dashboard-heading h1,
.student-grades .dashboard-heading h1 {
  font-size: 2rem;
  line-height: 1.08;
  font-weight: 820;
}

.student-classroom:not(.student-dashboard):not(.student-calendar):not(.student-messages):not(.student-grades) .course-identity h1 {
  font-size: 1.94rem;
  line-height: 1.08;
  font-weight: 820;
}

.student-classroom .dashboard-heading p,
.student-classroom .course-meta,
.student-classroom .panel-title-row p,
.student-classroom .rail-panel p,
.student-classroom .intro-grid p,
.student-classroom .experiment-stage-grid p {
  line-height: 1.55;
}

.student-dashboard .dashboard-heading p,
.student-calendar .dashboard-heading p,
.student-messages .dashboard-heading p,
.student-grades .dashboard-heading p {
  max-width: 64ch;
  font-size: 0.98rem;
}

.student-classroom .panel-title-row h2,
.student-classroom .rail-panel h2,
.student-classroom .readiness-card h3 {
  font-size: 1.02rem;
  line-height: 1.18;
  font-weight: 790;
}

.student-dashboard .current-course-panel .panel-title-row h2,
.student-grades [data-grade-table] .panel-title-row h2 {
  font-size: 1.24rem;
  line-height: 1.14;
}

.student-classroom .classroom-table,
.student-classroom .progress-cell,
.student-classroom .readiness-list,
.student-classroom .overall-progress,
.student-classroom .metric-tile,
.student-classroom .calendar-day > span,
.student-classroom .agenda-row time {
  font-variant-numeric: tabular-nums;
}

.student-classroom .classroom-panel,
.student-classroom .rail-panel,
.student-classroom .readiness-card,
.student-classroom .metric-tile,
.student-classroom .calendar-month-grid,
.student-classroom .message-row {
  box-shadow: 0 1px 1px oklch(22% 0.03 248 / 0.035), 0 10px 24px oklch(22% 0.03 248 / 0.045);
}

.student-dashboard .dashboard-metric-grid {
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 14px;
  margin-bottom: 26px;
}

.student-dashboard .metric-tile {
  min-height: 112px;
  align-content: stretch;
  gap: 10px 14px;
  padding: 18px 20px;
  border-color: oklch(86% 0.024 238);
}

.student-dashboard .metric-tile:first-child {
  grid-column: span 2;
  background:
    linear-gradient(135deg, oklch(96.2% 0.04 254), oklch(99% 0.006 238));
  border-color: oklch(84% 0.06 254);
}

.student-dashboard .metric-tile.is-deadline {
  background: linear-gradient(180deg, var(--class-calendar-soft), var(--class-surface));
  border-color: oklch(86% 0.055 73);
}

.student-dashboard .metric-tile.is-lab {
  background: linear-gradient(180deg, var(--class-lab-soft), var(--class-surface));
  border-color: oklch(84% 0.055 214);
}

.student-dashboard .metric-tile.is-message {
  background: linear-gradient(180deg, var(--class-message-soft), var(--class-surface));
  border-color: oklch(84% 0.055 292);
}

.student-dashboard .metric-tile > span:not(.metric-icon) {
  color: var(--class-muted);
  font-size: 0.78rem;
  font-weight: 760;
  letter-spacing: 0.02em;
}

.student-dashboard .metric-tile strong {
  align-self: end;
  font-size: 1.84rem;
  font-weight: 820;
}

.student-dashboard .metric-tile:first-child strong {
  font-size: 2.18rem;
}

.student-dashboard .metric-tile small {
  color: var(--class-muted);
  font-size: 0.8rem;
  line-height: 1.25;
}

.student-dashboard .metric-icon {
  width: 40px;
  height: 40px;
}

.student-dashboard .metric-tile.is-deadline .metric-icon {
  background: var(--class-calendar-soft);
  color: var(--class-calendar);
}

.student-dashboard .metric-tile.is-lab .metric-icon {
  background: var(--class-lab-soft);
  color: var(--class-lab);
}

.student-dashboard .metric-tile.is-message .metric-icon {
  background: var(--class-message-soft);
  color: var(--class-message);
}

.student-dashboard .dashboard-layout,
.student-calendar .dashboard-layout,
.student-grades .dashboard-layout {
  grid-template-columns: minmax(0, 1fr) 332px;
  gap: 28px;
}

.student-dashboard .dashboard-main-stack,
.student-calendar .dashboard-main-stack,
.student-grades .dashboard-main-stack {
  gap: 22px;
}

.student-dashboard .dashboard-current-grid {
  grid-template-columns: minmax(0, 1fr) minmax(288px, 0.62fr);
  gap: 22px;
  align-items: stretch;
  padding-top: 4px;
}

.student-dashboard .next-task-block {
  padding: 4px 8px 4px 0;
  border: 0;
  background: transparent;
  box-shadow: none;
}

.student-dashboard .next-task-block h3 {
  max-width: 34ch;
  font-size: 1.28rem;
  line-height: 1.24;
  text-wrap: balance;
}

.student-dashboard .lab-entry-block {
  padding: 20px;
  border-color: oklch(38% 0.05 224);
  background:
    radial-gradient(circle at 92% 4%, oklch(70% 0.14 214 / 0.18), transparent 12rem),
    linear-gradient(180deg, oklch(24% 0.045 238), oklch(18% 0.038 248));
}

.student-dashboard .lab-entry-block .button {
  min-height: 54px;
  background: oklch(55% 0.19 254);
}

.student-classroom .course-overview-row {
  min-height: 58px;
  padding: 10px 12px;
}

.student-classroom .course-overview-row strong,
.student-classroom .mini-material-row strong,
.student-classroom .agenda-row strong {
  font-weight: 740;
}

.student-classroom .agenda-row {
  grid-template-columns: 78px auto minmax(0, 1fr);
  min-height: 62px;
}

.student-classroom .agenda-row time {
  color: var(--class-primary-dark);
}

.student-calendar .classroom-nav-link.is-active {
  border-color: oklch(86% 0.055 73);
  background: var(--class-calendar-soft);
  color: var(--class-calendar);
}

.student-messages .classroom-nav-link.is-active {
  border-color: oklch(84% 0.055 292);
  background: var(--class-message-soft);
  color: var(--class-message);
}

.student-grades .classroom-nav-link.is-active {
  border-color: oklch(84% 0.055 151);
  background: var(--class-grade-soft);
  color: var(--class-grade);
}

.student-calendar .calendar-month-label strong {
  color: var(--class-calendar);
}

.student-messages .message-summary-pill strong {
  color: var(--class-message);
}

.student-grades [data-grade-summary] strong {
  color: var(--class-grade);
}

.student-calendar .calendar-month-grid {
  border-color: oklch(85% 0.034 238);
}

.student-calendar .calendar-weekday {
  background: oklch(95.5% 0.014 238);
  color: oklch(43% 0.035 238);
  letter-spacing: 0.055em;
  text-transform: uppercase;
}

.student-calendar .calendar-day {
  min-height: 132px;
  gap: 8px;
  padding: 11px;
}

.student-calendar .calendar-day.has-event {
  background: oklch(99.1% 0.006 238);
}

.student-calendar .calendar-day > span {
  color: oklch(39% 0.04 238);
}

.student-calendar .calendar-event {
  gap: 3px;
  padding: 8px;
  border-radius: 7px;
}

.student-calendar .calendar-event.kind-exercise {
  border-color: oklch(86% 0.055 73);
  background: var(--class-calendar-soft);
  color: var(--class-calendar);
}

.student-calendar .calendar-event.kind-lab,
.student-calendar .calendar-event.kind-result {
  border-color: oklch(84% 0.055 214);
  background: var(--class-lab-soft);
  color: var(--class-lab);
}

.student-calendar .calendar-event.kind-reading {
  border-color: oklch(84% 0.055 292);
  background: var(--class-message-soft);
  color: var(--class-message);
}

.student-messages .message-workspace {
  grid-template-columns: minmax(340px, 0.78fr) minmax(0, 1.22fr);
  gap: 28px;
}

.student-messages .message-list-panel {
  padding: 20px;
}

.student-messages .message-row {
  min-height: 76px;
  border-color: oklch(87% 0.018 248);
  box-shadow: none;
}

.student-messages .message-row.is-active,
.student-messages .message-row:hover,
.student-messages .message-row:focus-visible {
  border-color: oklch(78% 0.075 292);
  background: var(--class-message-soft);
}

.student-messages .message-avatar {
  background: var(--class-message);
}

.student-messages .message-detail-panel {
  min-height: 560px;
  padding: 26px;
  background:
    linear-gradient(180deg, oklch(99.2% 0.006 292), var(--class-surface));
}

.student-messages .message-detail-header {
  gap: 16px;
}

.student-messages .message-detail-header h2 {
  max-width: 36ch;
  font-size: 1.48rem;
  line-height: 1.16;
  text-wrap: balance;
}

.student-messages .message-body {
  padding: 22px 0;
}

.student-messages .message-body p {
  max-width: 66ch;
  color: oklch(31% 0.035 248);
  font-size: 1.02rem;
  line-height: 1.68;
}

.student-messages .message-context {
  border-color: oklch(88% 0.03 292);
  background: var(--class-message-soft);
}

.student-grades .gradebook-table .table-header,
.student-grades .gradebook-table .table-row {
  grid-template-columns: minmax(300px, 1.42fr) 142px 146px 96px 120px;
}

.student-grades .gradebook-table .table-row {
  min-height: 64px;
}

.student-grades .gradebook-table .table-row [data-label="Score"] strong,
.student-grades .gradebook-table .table-row [data-label="Weight"] {
  font-variant-numeric: tabular-nums;
}

.student-grades .rail-panel:first-child {
  background: linear-gradient(180deg, var(--class-grade-soft), var(--class-surface));
  border-color: oklch(84% 0.055 151);
}

.student-classroom:not(.student-dashboard):not(.student-calendar):not(.student-messages):not(.student-grades) .course-workspace-grid {
  border-color: oklch(85.5% 0.018 238);
}

.student-classroom:not(.student-dashboard):not(.student-calendar):not(.student-messages):not(.student-grades) .classroom-panel {
  padding: 0;
  border: 0;
  background: transparent;
  box-shadow: none;
}

.student-classroom:not(.student-dashboard):not(.student-calendar):not(.student-messages):not(.student-grades) .step-segment.is-active {
  background: linear-gradient(180deg, oklch(94.6% 0.052 254), oklch(98.8% 0.012 254));
}

.student-classroom:not(.student-dashboard):not(.student-calendar):not(.student-messages):not(.student-grades) .classroom-table {
  border-color: oklch(85.5% 0.018 238);
}

.student-classroom:not(.student-dashboard):not(.student-calendar):not(.student-messages):not(.student-grades) .table-row:hover {
  background: oklch(98.6% 0.012 254);
}

.student-classroom:not(.student-dashboard):not(.student-calendar):not(.student-messages):not(.student-grades) .experiment-dock {
  background:
    radial-gradient(circle at 82% 0%, oklch(64% 0.13 214 / 0.18), transparent 18rem),
    linear-gradient(180deg, oklch(24% 0.043 238), oklch(17.5% 0.036 248));
}

@media (max-width: 1280px) {
  .student-dashboard .dashboard-metric-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .student-dashboard .metric-tile:first-child {
    grid-column: span 1;
  }

  .student-messages .message-workspace {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (max-width: 980px) {
  .student-dashboard .dashboard-current-grid,
  .student-dashboard .dashboard-layout,
  .student-calendar .dashboard-layout,
  .student-grades .dashboard-layout {
    grid-template-columns: 1fr;
  }

  .student-dashboard .next-task-block {
    padding-right: 0;
  }
}

@media (max-width: 720px) {
  .student-dashboard .classroom-content,
  .student-calendar .classroom-content,
  .student-messages .classroom-content,
  .student-grades .classroom-content {
    padding: 22px 16px 24px;
  }

  .student-dashboard .dashboard-heading h1,
  .student-calendar .dashboard-heading h1,
  .student-messages .dashboard-heading h1,
  .student-grades .dashboard-heading h1,
  .student-classroom:not(.student-dashboard):not(.student-calendar):not(.student-messages):not(.student-grades) .course-identity h1 {
    font-size: 1.58rem;
  }

  .student-dashboard .dashboard-metric-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .student-dashboard .metric-tile strong,
  .student-dashboard .metric-tile:first-child strong {
    font-size: 1.72rem;
  }

  .student-calendar .calendar-day {
    min-height: 118px;
  }

  .student-messages .message-detail-panel {
    min-height: auto;
    padding: 18px;
  }

  .student-grades .gradebook-table .table-row {
    grid-template-columns: 1fr;
  }
}

/* Desktop collapsible sidebar rail */

@media (min-width: 981px) and (hover: hover) and (pointer: fine) {
  body.student-classroom {
    --sidebar-rail-width: 76px;
    --sidebar-expanded-width: 328px;
  }

  .student-classroom .classroom-shell {
    grid-template-columns: var(--sidebar-rail-width) minmax(0, 1fr);
    overflow-x: clip;
  }

  .student-classroom .classroom-sidebar {
    z-index: 30;
    width: var(--sidebar-rail-width);
    min-width: var(--sidebar-rail-width);
    max-width: var(--sidebar-expanded-width);
    overflow-x: hidden;
    border-right: 1px solid var(--class-line);
    box-shadow:
      inset -1px 0 0 var(--class-line),
      10px 0 28px oklch(22% 0.03 248 / 0);
    transition:
      width 190ms cubic-bezier(0.22, 1, 0.36, 1),
      box-shadow 190ms cubic-bezier(0.22, 1, 0.36, 1);
    will-change: width;
  }

  .student-classroom .classroom-sidebar:hover,
  .student-classroom .classroom-sidebar:focus-within,
  .student-classroom .classroom-sidebar.is-expanded {
    width: var(--sidebar-expanded-width);
    box-shadow:
      inset -1px 0 0 var(--class-line),
      18px 0 42px oklch(22% 0.03 248 / 0.12);
  }

  .student-classroom .classroom-brand,
  .student-classroom .classroom-nav-link,
  .student-classroom .course-menu-heading,
  .student-classroom .pinned-label,
  .student-classroom .course-menu-item,
  .student-classroom .classroom-sidebar-footer {
    width: calc(var(--sidebar-expanded-width) - 24px);
  }

  .student-classroom .classroom-brand {
    grid-template-columns: 42px minmax(0, 1fr);
    gap: 12px;
  }

  .student-classroom .classroom-nav-link,
  .student-classroom .course-menu-item {
    grid-template-columns: 28px minmax(0, 1fr) auto;
  }

  .student-classroom .classroom-nav-link {
    position: relative;
    color: transparent;
  }

  .student-classroom .classroom-nav-link.is-active {
    color: transparent;
  }

  .student-classroom .classroom-nav-link .nav-icon {
    color: oklch(38% 0.04 247);
  }

  .student-classroom .classroom-nav-link.is-active .nav-icon {
    color: oklch(45% 0.18 254);
  }

  .student-classroom .classroom-brand > span:last-child,
  .student-classroom .classroom-nav-link > :not(.nav-icon):not(.nav-count),
  .student-classroom .course-menu-heading span,
  .student-classroom .course-menu-heading .icon-button,
  .student-classroom .pinned-label,
  .student-classroom .course-menu-item > span:last-child,
  .student-classroom .classroom-sidebar-footer .classroom-nav-link > :not(.nav-icon) {
    opacity: 0;
    pointer-events: none;
    transform: translateX(-6px);
    transition:
      opacity 130ms ease-out,
      transform 160ms cubic-bezier(0.22, 1, 0.36, 1);
  }

  .student-classroom .classroom-sidebar:hover .classroom-brand > span:last-child,
  .student-classroom .classroom-sidebar:focus-within .classroom-brand > span:last-child,
  .student-classroom .classroom-sidebar.is-expanded .classroom-brand > span:last-child,
  .student-classroom .classroom-sidebar:hover .classroom-nav-link,
  .student-classroom .classroom-sidebar:focus-within .classroom-nav-link,
  .student-classroom .classroom-sidebar.is-expanded .classroom-nav-link,
  .student-classroom .classroom-sidebar:hover .classroom-nav-link > :not(.nav-icon):not(.nav-count),
  .student-classroom .classroom-sidebar:focus-within .classroom-nav-link > :not(.nav-icon):not(.nav-count),
  .student-classroom .classroom-sidebar.is-expanded .classroom-nav-link > :not(.nav-icon):not(.nav-count),
  .student-classroom .classroom-sidebar:hover .course-menu-heading span,
  .student-classroom .classroom-sidebar:focus-within .course-menu-heading span,
  .student-classroom .classroom-sidebar.is-expanded .course-menu-heading span,
  .student-classroom .classroom-sidebar:hover .course-menu-heading .icon-button,
  .student-classroom .classroom-sidebar:focus-within .course-menu-heading .icon-button,
  .student-classroom .classroom-sidebar.is-expanded .course-menu-heading .icon-button,
  .student-classroom .classroom-sidebar:hover .pinned-label,
  .student-classroom .classroom-sidebar:focus-within .pinned-label,
  .student-classroom .classroom-sidebar.is-expanded .pinned-label,
  .student-classroom .classroom-sidebar:hover .course-menu-item > span:last-child,
  .student-classroom .classroom-sidebar:focus-within .course-menu-item > span:last-child,
  .student-classroom .classroom-sidebar.is-expanded .course-menu-item > span:last-child,
  .student-classroom .classroom-sidebar:hover .classroom-sidebar-footer .classroom-nav-link > :not(.nav-icon),
  .student-classroom .classroom-sidebar:focus-within .classroom-sidebar-footer .classroom-nav-link > :not(.nav-icon),
  .student-classroom .classroom-sidebar.is-expanded .classroom-sidebar-footer .classroom-nav-link > :not(.nav-icon) {
    opacity: 1;
    pointer-events: auto;
    transform: translateX(0);
    transition-delay: 45ms;
  }

  .student-classroom .classroom-sidebar:hover .classroom-nav-link,
  .student-classroom .classroom-sidebar:focus-within .classroom-nav-link,
  .student-classroom .classroom-sidebar.is-expanded .classroom-nav-link {
    color: oklch(38% 0.04 247);
  }

  .student-classroom .classroom-sidebar:hover .classroom-nav-link.is-active,
  .student-classroom .classroom-sidebar:focus-within .classroom-nav-link.is-active,
  .student-classroom .classroom-sidebar.is-expanded .classroom-nav-link.is-active {
    color: oklch(45% 0.18 254);
  }

  .student-classroom .nav-count {
    opacity: 0;
    transform: scale(0.8);
    transition:
      opacity 130ms ease-out,
      transform 160ms cubic-bezier(0.22, 1, 0.36, 1);
  }

  .student-classroom .classroom-sidebar:hover .nav-count,
  .student-classroom .classroom-sidebar:focus-within .nav-count,
  .student-classroom .classroom-sidebar.is-expanded .nav-count {
    opacity: 1;
    transform: scale(1);
  }

  .student-classroom .classroom-course-menu {
    min-width: calc(var(--sidebar-expanded-width) - 24px);
  }
}

/* Full-width student workspace + line icon density pass */

.student-classroom .brand-mark {
  overflow: visible;
  background: transparent;
  box-shadow: none;
}

.student-classroom .brand-mark-image {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.student-classroom .course-file-icon {
  overflow: visible;
}

.student-classroom .metric-icon.is-dark {
  background: oklch(24% 0.045 238);
}

.student-classroom .nav-icon svg,
.student-classroom .course-file-icon svg {
  width: 18px;
  height: 18px;
  stroke-width: 1.9;
}

.student-classroom .metric-icon svg {
  width: 20px;
  height: 20px;
  stroke-width: 1.9;
}

.student-classroom .dock-icon svg {
  width: 20px;
  height: 20px;
  stroke-width: 1.9;
}

@media (min-width: 981px) {
  .student-dashboard .classroom-content,
  .student-calendar .classroom-content,
  .student-messages .classroom-content,
  .student-grades .classroom-content {
    width: 100%;
    max-width: none;
    padding: 34px 36px 34px 34px;
  }

  .student-dashboard .dashboard-heading,
  .student-calendar .dashboard-heading,
  .student-messages .dashboard-heading,
  .student-grades .dashboard-heading {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(280px, 420px);
    align-items: end;
    gap: 32px;
    margin-bottom: 24px;
  }

  .student-dashboard .dashboard-heading p,
  .student-calendar .dashboard-heading p,
  .student-messages .dashboard-heading p,
  .student-grades .dashboard-heading p {
    max-width: 54ch;
  }

  .student-dashboard .dashboard-metric-grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 16px;
    margin-bottom: 24px;
  }

  .student-dashboard .metric-tile,
  .student-dashboard .metric-tile:first-child {
    grid-column: span 3;
  }

  .student-dashboard .dashboard-layout,
  .student-calendar .dashboard-layout,
  .student-grades .dashboard-layout {
    grid-template-columns: minmax(0, 8fr) minmax(340px, 4fr);
    gap: 30px;
    align-items: start;
  }

  .student-dashboard .classroom-right-rail,
  .student-calendar .classroom-right-rail,
  .student-grades .classroom-right-rail {
    position: sticky;
    top: 86px;
  }

  .student-dashboard .dashboard-current-grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(340px, 0.65fr);
    gap: 24px;
  }

  .student-dashboard .course-overview-row,
  .student-grades .course-overview-row {
    min-height: 64px;
    grid-template-columns: 44px minmax(0, 1fr) auto minmax(150px, 220px);
    gap: 16px;
  }

  .student-calendar .calendar-workspace .dashboard-main-stack,
  .student-grades .dashboard-main-stack {
    min-width: 0;
  }

  .student-messages .message-workspace {
    grid-template-columns: minmax(360px, 4fr) minmax(0, 8fr);
    gap: 30px;
  }

  .student-messages .message-detail-panel {
    min-height: calc(100vh - 190px);
  }
}

@media (min-width: 1680px) {
  .student-dashboard .classroom-content,
  .student-calendar .classroom-content,
  .student-messages .classroom-content,
  .student-grades .classroom-content {
    padding-left: 40px;
    padding-right: 40px;
  }

  .student-dashboard .dashboard-layout,
  .student-calendar .dashboard-layout,
  .student-grades .dashboard-layout {
    grid-template-columns: minmax(0, 9fr) minmax(360px, 3fr);
  }
}

@media (max-width: 1280px) and (min-width: 981px) {
  .student-dashboard .dashboard-metric-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .student-dashboard .metric-tile,
  .student-dashboard .metric-tile:first-child {
    grid-column: span 1;
  }

  .student-dashboard .dashboard-layout,
  .student-calendar .dashboard-layout,
  .student-grades .dashboard-layout {
    grid-template-columns: minmax(0, 1fr) 320px;
    gap: 22px;
  }
}

/* Medium-high density refinement */

body.student-classroom {
  font-size: 1rem;
  line-height: 1.42;
}

.student-classroom .classroom-brand strong,
.student-classroom .classroom-nav-link,
.student-classroom .course-menu-item strong,
.student-classroom .panel-title-row h2,
.student-classroom .rail-panel h2,
.student-classroom .readiness-card h3 {
  font-weight: 700;
}

.student-classroom .section-kicker,
.student-classroom .pinned-label,
.student-classroom .status-pill,
.student-classroom .type-pill,
.student-classroom .task-meta-line span {
  font-weight: 700;
}

.student-dashboard .dashboard-heading h1,
.student-calendar .dashboard-heading h1,
.student-messages .dashboard-heading h1,
.student-grades .dashboard-heading h1 {
  font-size: 1.78rem;
  line-height: 1.08;
}

.student-dashboard .dashboard-heading p,
.student-calendar .dashboard-heading p,
.student-messages .dashboard-heading p,
.student-grades .dashboard-heading p,
.student-classroom .panel-title-row p,
.student-classroom .rail-panel p {
  font-size: 0.94rem;
  line-height: 1.42;
}

.student-dashboard .classroom-panel,
.student-calendar .classroom-panel,
.student-messages .classroom-panel,
.student-grades .classroom-panel,
.student-dashboard .rail-panel,
.student-calendar .rail-panel,
.student-grades .rail-panel {
  padding: 16px;
}

.student-dashboard .dashboard-main-stack,
.student-calendar .dashboard-main-stack,
.student-grades .dashboard-main-stack,
.student-dashboard .classroom-right-rail,
.student-calendar .classroom-right-rail,
.student-grades .classroom-right-rail {
  gap: 16px;
}

.student-classroom .button,
.student-classroom .ghost-button {
  min-height: 36px;
  padding: 8px 13px;
}

.student-dashboard .dashboard-metric-grid {
  gap: 10px;
  margin-bottom: 14px;
}

.student-dashboard .metric-tile {
  min-height: 72px;
  grid-template-columns: 30px minmax(0, 1fr) auto;
  align-content: center;
  align-items: center;
  gap: 3px 10px;
  padding: 11px 13px;
}

.student-dashboard .metric-tile:first-child {
  background: linear-gradient(135deg, oklch(96.5% 0.034 254), oklch(99% 0.006 238));
}

.student-dashboard .metric-icon {
  width: 30px;
  height: 30px;
}

.student-dashboard .metric-tile > span:not(.metric-icon) {
  grid-column: 2;
  font-size: 0.76rem;
}

.student-dashboard .metric-tile strong,
.student-dashboard .metric-tile:first-child strong {
  grid-column: 3;
  grid-row: 1 / 3;
  align-self: center;
  font-size: 1.45rem;
  line-height: 1;
}

.student-dashboard .metric-tile small {
  grid-column: 2;
  font-size: 0.76rem;
}

.student-dashboard .dashboard-current-grid {
  gap: 16px;
}

.student-dashboard .next-task-block,
.student-dashboard .lab-entry-block {
  gap: 10px;
}

.student-dashboard .next-task-block h3 {
  max-width: 46ch;
  font-size: 1.14rem;
  line-height: 1.18;
}

.student-dashboard .lab-entry-block {
  padding: 16px;
}

.student-dashboard .lab-entry-block .button {
  min-height: 42px;
}

.student-classroom .course-overview-row {
  min-height: 50px;
  padding: 8px 10px;
}

.student-classroom .course-overview-row strong,
.student-classroom .agenda-row strong,
.student-classroom .message-digest-list strong,
.student-classroom .compact-list strong {
  font-size: 0.88rem;
}

.student-classroom .course-overview-row small,
.student-classroom .agenda-row small,
.student-classroom .message-digest-list span,
.student-classroom .compact-list span {
  font-size: 0.76rem;
}

.student-classroom .progress-track {
  height: 6px;
}

.student-classroom .agenda-list,
.student-classroom .compact-list,
.student-classroom .message-digest-list {
  gap: 6px;
}

.student-classroom .agenda-row,
.student-classroom .compact-list a,
.student-classroom .message-digest-list a {
  min-height: 48px;
  padding: 7px 0;
}

.student-classroom .classroom-table .table-header,
.student-classroom .classroom-table .table-row {
  min-height: 46px;
  padding-top: 8px;
  padding-bottom: 8px;
}

.student-classroom .table-row strong {
  font-size: 0.88rem;
}

.student-classroom .table-row small {
  font-size: 0.74rem;
}

.student-calendar .calendar-day {
  min-height: 108px;
  gap: 6px;
  padding: 8px;
}

.student-calendar .calendar-event {
  gap: 1px;
  padding: 5px 6px;
}

.student-calendar .calendar-event strong {
  font-size: 0.74rem;
}

.student-calendar .calendar-event small {
  font-size: 0.72rem;
  line-height: 1.15;
}

.student-messages .message-list-panel {
  padding: 16px;
}

.student-messages .message-row {
  min-height: 62px;
  padding: 10px 12px;
}

.student-messages .message-row strong {
  font-size: 0.9rem;
}

.student-messages .message-detail-panel {
  padding: 20px;
}

.student-messages .message-detail-header h2 {
  font-size: 1.28rem;
}

.student-messages .message-body {
  padding: 16px 0;
}

.student-messages .message-body p {
  font-size: 0.98rem;
  line-height: 1.56;
}

.student-grades .gradebook-table .table-row {
  min-height: 52px;
}

@media (min-width: 981px) {
  .student-dashboard .classroom-content,
  .student-calendar .classroom-content,
  .student-messages .classroom-content,
  .student-grades .classroom-content {
    padding: 24px 28px 28px;
  }

  .student-dashboard .dashboard-heading,
  .student-calendar .dashboard-heading,
  .student-messages .dashboard-heading,
  .student-grades .dashboard-heading {
    margin-bottom: 16px;
  }

  .student-dashboard .dashboard-layout,
  .student-calendar .dashboard-layout,
  .student-grades .dashboard-layout {
    grid-template-columns: minmax(0, 8.5fr) minmax(318px, 3.5fr);
    gap: 20px;
  }

  .student-dashboard .dashboard-current-grid {
    grid-template-columns: minmax(0, 1.45fr) minmax(300px, 0.55fr);
  }

  .student-dashboard .course-overview-row,
  .student-grades .course-overview-row {
    min-height: 52px;
    grid-template-columns: 36px minmax(0, 1fr) auto minmax(140px, 200px);
    gap: 12px;
  }

  .student-messages .message-workspace {
    grid-template-columns: minmax(340px, 3.5fr) minmax(0, 8.5fr);
    gap: 20px;
  }
}

@media (min-width: 1680px) {
  .student-dashboard .classroom-content,
  .student-calendar .classroom-content,
  .student-messages .classroom-content,
  .student-grades .classroom-content {
    padding-left: 30px;
    padding-right: 30px;
  }
}

/* Impeccable polish: type rhythm, containment, and subtle product delight */

body.student-classroom {
  font-synthesis-weight: none;
}

.student-classroom .classroom-brand strong,
.student-classroom .dashboard-heading h1,
.student-classroom .course-identity h1,
.student-classroom .panel-title-row h2,
.student-classroom .rail-panel h2,
.student-classroom .readiness-card h3,
.student-classroom .message-detail-header h2 {
  font-weight: 700;
}

.student-classroom .dashboard-heading h1,
.student-classroom .course-identity h1 {
  color: oklch(18% 0.03 248);
  letter-spacing: 0;
}

.student-classroom .section-kicker {
  letter-spacing: 0.075em;
}

.student-classroom .classroom-nav-link,
.student-classroom .course-menu-item strong,
.student-classroom .button,
.student-classroom .ghost-button,
.student-classroom .text-link,
.student-classroom .status-pill,
.student-classroom .type-pill {
  font-weight: 600;
}

.student-classroom .table-header,
.student-classroom .readiness-list dt,
.student-classroom .calendar-weekday {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.055em;
}

.student-classroom .classroom-panel,
.student-classroom .rail-panel,
.student-classroom .readiness-card,
.student-classroom .metric-tile,
.student-classroom .message-row {
  contain: layout paint;
  box-shadow: 0 1px 2px oklch(22% 0.03 248 / 0.045), 0 8px 18px oklch(22% 0.03 248 / 0.035);
}

.student-dashboard .current-course-panel {
  padding: 18px;
}

.student-dashboard .current-course-panel .panel-title-row {
  margin-bottom: 10px;
}

.student-dashboard .current-course-panel .button {
  align-self: start;
}

.student-dashboard .next-task-block {
  align-content: start;
}

.student-dashboard .task-meta-line span {
  min-height: 26px;
  padding: 3px 8px;
}

.student-dashboard .lab-entry-block {
  min-height: 160px;
}

.student-classroom .course-overview-list {
  gap: 7px;
}

.student-classroom .course-overview-row {
  border-color: oklch(87% 0.018 248);
}

.student-classroom .course-overview-row .course-file-icon {
  color: oklch(39% 0.06 248);
}

.student-classroom .readiness-list div {
  min-height: 34px;
}

.student-calendar .calendar-month-grid {
  background: var(--class-surface);
}

.student-calendar .calendar-day > span {
  font-weight: 600;
}

.student-messages .message-row {
  grid-template-columns: 34px minmax(0, 1fr) auto;
}

.student-messages .message-avatar {
  width: 34px;
  height: 34px;
  font-weight: 700;
}

.student-messages .message-actions {
  gap: 8px;
}

.student-grades .gradebook-table .table-header,
.student-grades .gradebook-table .table-row {
  grid-template-columns: minmax(300px, 1.5fr) 132px 136px 86px 110px;
}

.student-classroom .button:focus-visible,
.student-classroom .ghost-button:focus-visible,
.student-classroom .text-link:focus-visible,
.student-classroom .course-overview-row:focus-visible,
.student-classroom .message-row:focus-visible,
.student-classroom .calendar-event:focus-visible {
  outline: 3px solid oklch(72% 0.14 254 / 0.34);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: no-preference) {
  .student-classroom .button,
  .student-classroom .ghost-button,
  .student-classroom .course-overview-row,
  .student-classroom .calendar-event,
  .student-classroom .message-row,
  .student-dashboard .lab-entry-block {
    transition:
      transform 140ms var(--ease-out),
      border-color 160ms var(--ease-out),
      box-shadow 160ms var(--ease-out),
      background 160ms var(--ease-out),
      color 160ms var(--ease-out);
  }

  .student-classroom .button:active,
  .student-classroom .ghost-button:active {
    transform: translateY(1px);
  }

  .student-classroom .course-overview-row:hover,
  .student-classroom .message-row:hover,
  .student-classroom .calendar-event:hover {
    transform: translateY(-1px);
  }

  .student-dashboard .lab-entry-block:hover {
    transform: translateY(-1px);
    box-shadow: 0 14px 28px oklch(15% 0.04 248 / 0.18);
  }

  .student-classroom .course-overview-row:hover .course-file-icon svg,
  .student-classroom .calendar-event:hover svg {
    transform: translateY(-1px);
  }
}

@media (min-width: 981px) {
  .student-dashboard .dashboard-heading,
  .student-calendar .dashboard-heading,
  .student-messages .dashboard-heading,
  .student-grades .dashboard-heading {
    grid-template-columns: minmax(0, 1fr) minmax(260px, 360px);
  }

  .student-dashboard .dashboard-layout,
  .student-calendar .dashboard-layout,
  .student-grades .dashboard-layout {
    grid-template-columns: minmax(0, 8.75fr) minmax(300px, 3.25fr);
  }
}

@media (max-width: 720px) {
  .student-dashboard .current-course-panel {
    padding: 16px;
  }

  .student-grades .gradebook-table .table-header,
  .student-grades .gradebook-table .table-row {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 980px) {
  .student-classroom .exercise-readiness-layout {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .student-classroom .exercise-readiness-layout .experiment-readiness-card {
    min-height: 0;
  }
}

@media (max-width: 720px) {
  .student-classroom .exercise-readiness-title .ghost-button {
    width: 100%;
    justify-content: center;
  }

  .student-classroom [data-stage-content],
  .student-classroom .classroom-table,
  .student-classroom .materials-table,
  .student-classroom .exercise-table {
    width: 100%;
    max-width: 100%;
    min-width: 0;
  }

  .student-classroom .materials-table .table-row,
  .student-classroom .exercise-table .table-row {
    grid-template-columns: minmax(0, 1fr);
  }

  .student-classroom .table-row > span,
  .student-classroom .resource-name > span {
    min-width: 0;
  }

  .student-classroom .table-row strong,
  .student-classroom .table-row small {
    overflow-wrap: anywhere;
    white-space: normal;
  }

  .student-classroom .exercise-table .table-row > span:first-child {
    display: grid;
    align-items: start;
    gap: 4px;
  }
}