/* AARI Robotics — warm academic palette */

:root {
  --bg-cream: #f5f1e8;
  --bg-card: #faf7f0;
  --accent-maroon: #8b3a3a;
  --accent-maroon-hover: #723030;
  --text-primary: #3d3429;
  --text-muted: #6b5f52;
  --border-soft: #ddd5c8;
  --rail-bg: #ebe4d6;
  --sidebar-bg: #f0ebe2;
  --progress-track: #ddd5c8;
  --progress-fill: #8b3a3a;
  --badge-bg: #e8dfd0;
  --success-bg: #d4e8d4;
  --success-text: #2d5a2d;
  --warning-bg: #f0e4c8;
  --warning-text: #6b4f2d;
  --overlay-maroon: rgba(139, 58, 58, 0.06);
  --overlay-slate: rgba(61, 52, 41, 0.06);
  --font-serif: "Georgia", "Times New Roman", serif;
  --font-sans: "Segoe UI", system-ui, -apple-system, sans-serif;
  --radius: 10px;
  --radius-pill: 999px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

/* Component display rules (.btn, .doc-audio) otherwise beat the UA [hidden] rule. */
[hidden] {
  display: none !important;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.55;
  color: var(--text-primary);
  background: var(--bg-cream);
}

body.overlay-maroon {
  background-image: linear-gradient(var(--overlay-maroon), var(--overlay-maroon));
}

body.overlay-slate {
  background-image: linear-gradient(var(--overlay-slate), var(--overlay-slate));
}

a {
  color: var(--accent-maroon);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

h1, h2, h3, h4 {
  font-family: var(--font-serif);
  font-weight: 600;
  line-height: 1.25;
  margin: 0 0 0.75rem;
}

h1 { font-size: 1.75rem; }
h2 { font-size: 1.35rem; }
h3 { font-size: 1.1rem; }

p {
  margin: 0 0 1rem;
}

/* ---- Public pages ---- */

.public-page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.public-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 2rem;
  border-bottom: 1px solid var(--border-soft);
  background: var(--bg-card);
}

.brand {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--accent-maroon);
}

.public-main {
  flex: 1;
  max-width: 880px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem;
  width: 100%;
}

.hero {
  text-align: center;
  margin-bottom: 2.5rem;
}

.hero p {
  color: var(--text-muted);
  font-size: 1.05rem;
  max-width: 560px;
  margin-left: auto;
  margin-right: auto;
}

.entry-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.25rem;
}

.entry-card {
  background: var(--bg-card);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.entry-card:hover {
  border-color: var(--accent-maroon);
  box-shadow: 0 4px 16px rgba(61, 52, 41, 0.08);
  text-decoration: none;
}

.entry-card h2 {
  color: var(--accent-maroon);
}

.entry-card p {
  color: var(--text-muted);
  margin-bottom: 0;
}

/* 2fr/2fr/1fr with 3:2 landscape tiles gives the portrait tile a 3:4 shape at the same height */
.home-gallery {
  display: grid;
  grid-template-columns: 2fr 2fr 1fr;
  gap: 1rem;
  margin-top: 2.5rem;
}

.home-gallery-item {
  margin: 0;
  overflow: hidden;
  border-radius: var(--radius);
  border: 1px solid var(--border-soft);
  background: var(--bg-card);
  aspect-ratio: 3 / 2;
}

.home-gallery-tall {
  aspect-ratio: 3 / 4;
}

.home-gallery-item img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.home-gallery-tall img {
  transform: scale(1.35);
  transform-origin: 42% 45%;
}

@media (max-width: 640px) {
  .home-gallery {
    grid-template-columns: 1fr;
  }

  .home-gallery-tall {
    width: 60%;
    justify-self: center;
  }
}

.auth-card {
  max-width: 420px;
  margin: 2rem auto;
  background: var(--bg-card);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  padding: 2rem;
}

.form-group {
  margin-bottom: 1rem;
}

.form-group label {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 0.35rem;
  color: var(--text-muted);
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 0.6rem 0.75rem;
  border: 1px solid var(--border-soft);
  border-radius: 8px;
  font: inherit;
  background: #fff;
  color: var(--text-primary);
}

.form-group textarea {
  min-height: 120px;
  resize: vertical;
}

.btn {
  display: inline-block;
  padding: 0.55rem 1.1rem;
  border: none;
  border-radius: var(--radius-pill);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  text-align: center;
}

.btn-primary {
  background: var(--accent-maroon);
  color: #fff;
}

.btn-primary:hover {
  background: var(--accent-maroon-hover);
  text-decoration: none;
  color: #fff;
}

.btn-secondary {
  background: var(--badge-bg);
  color: var(--text-primary);
}

.btn-secondary:hover {
  background: var(--border-soft);
  text-decoration: none;
}

.btn-danger {
  background: #a04040;
  color: #fff;
}

.btn-sm {
  padding: 0.35rem 0.75rem;
  font-size: 0.85rem;
}

.alert {
  padding: 0.75rem 1rem;
  border-radius: 8px;
  margin-bottom: 1rem;
  font-size: 0.95rem;
}

.alert-error {
  background: #f5dede;
  color: #6b2d2d;
  border: 1px solid #e0b4b4;
}

.alert-success {
  background: var(--success-bg);
  color: var(--success-text);
  border: 1px solid #b8d4b8;
}

/* ---- Course shell ---- */

.course-shell {
  display: flex;
  min-height: 100vh;
}

.course-rail {
  width: 72px;
  background: var(--rail-bg);
  border-right: 1px solid var(--border-soft);
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 1rem 0;
  gap: 0.75rem;
  flex-shrink: 0;
}

.rail-home {
  margin-bottom: 0.5rem;
}

.course-monogram {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
  background: var(--bg-card);
  border: 2px solid var(--border-soft);
  color: var(--text-muted);
  text-decoration: none;
}

.course-monogram:hover {
  border-color: var(--accent-maroon);
  text-decoration: none;
}

.course-monogram.active {
  background: var(--accent-maroon);
  border-color: var(--accent-maroon);
  color: #fff;
}

.course-sidebar {
  width: 220px;
  background: var(--sidebar-bg);
  border-right: 1px solid var(--border-soft);
  padding: 1.5rem 0;
  flex-shrink: 0;
}

.sidebar-course-title {
  font-family: var(--font-serif);
  font-size: 1rem;
  padding: 0 1.25rem 1rem;
  color: var(--accent-maroon);
  border-bottom: 1px solid var(--border-soft);
  margin-bottom: 0.75rem;
}

.sidebar-branch-label {
  display: block;
  margin-top: 0.35rem;
  font-family: var(--font-sans);
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--text-muted);
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.sidebar-branch-label.sidebar-branch-pending {
  color: var(--warning-text);
  font-style: italic;
  text-transform: none;
  font-weight: 500;
}

.lesson-branch-tag,
.dc-week-branch-tag {
  display: block;
  margin-top: 0.15rem;
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--accent-maroon);
}

.sidebar-course-picker {
  padding: 0 1.25rem 0.75rem;
  margin-bottom: 0.75rem;
  border-bottom: 1px solid var(--border-soft);
}

.sidebar-course-picker select {
  width: 100%;
  font-size: 0.85rem;
  padding: 0.35rem 0.5rem;
  border: 1px solid var(--border-soft);
  border-radius: 4px;
  background: var(--bg-cream);
}

.sidebar-nav a {
  display: block;
  padding: 0.55rem 1.25rem;
  color: var(--text-muted);
  font-size: 0.95rem;
  border-left: 3px solid transparent;
}

.sidebar-nav a:hover {
  background: rgba(139, 58, 58, 0.06);
  color: var(--text-primary);
  text-decoration: none;
}

.sidebar-nav a.active {
  color: var(--accent-maroon);
  font-weight: 600;
  border-left-color: var(--accent-maroon);
  background: rgba(139, 58, 58, 0.08);
}

.course-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.course-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.85rem 1.75rem;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border-soft);
  font-size: 0.9rem;
}

.topbar-user {
  color: var(--text-muted);
}

.course-content {
  flex: 1;
  padding: 1.75rem 2rem 2.5rem;
  max-width: 900px;
}

.course-header {
  margin-bottom: 1.5rem;
}

.progress-bar {
  height: 6px;
  background: var(--progress-track);
  border-radius: var(--radius-pill);
  overflow: hidden;
  margin-top: 0.75rem;
  max-width: 320px;
}

.progress-fill {
  height: 100%;
  background: var(--progress-fill);
  border-radius: var(--radius-pill);
  transition: width 0.3s;
}

.progress-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 0.35rem;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  margin-bottom: 1rem;
}

.card-meta {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.badge {
  display: inline-block;
  padding: 0.2rem 0.65rem;
  border-radius: var(--radius-pill);
  font-size: 0.8rem;
  font-weight: 600;
  background: var(--badge-bg);
  color: var(--text-muted);
}

.badge-success {
  background: var(--success-bg);
  color: var(--success-text);
}

.badge-warning {
  background: var(--warning-bg);
  color: var(--warning-text);
}

.module-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.module-list li {
  border-bottom: 1px solid var(--border-soft);
}

.module-list li:last-child {
  border-bottom: none;
}

.module-list a:not(.btn) {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 0;
  color: var(--text-primary);
}

.module-list a:not(.btn):hover {
  color: var(--accent-maroon);
}

.module-week-num {
  font-size: 0.85rem;
  color: var(--text-muted);
  min-width: 4rem;
}

.module-week-block {
  padding: 0;
}

.module-week-details {
  border-bottom: 1px solid var(--border-soft);
}

.module-week-details[open] .module-week-summary {
  color: var(--accent-maroon);
}

.module-week-summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 0;
  cursor: pointer;
  list-style: none;
  color: var(--text-primary);
}

.module-week-summary::-webkit-details-marker {
  display: none;
}

.module-week-summary-main {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  flex: 1;
}

.module-week-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-shrink: 0;
}

.module-week-progress {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.module-week-retention {
  flex-shrink: 0;
}

.module-day-list {
  list-style: none;
  margin: 0 0 0.75rem 0;
  padding: 0 0 0.5rem 1rem;
  border-left: 2px solid var(--border-soft);
}

.module-day-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.55rem 0.75rem;
  margin-bottom: 0.15rem;
  border-radius: 6px;
  color: var(--text-primary);
  text-decoration: none;
}

.module-day-link:hover {
  background: var(--surface-muted, rgba(0, 0, 0, 0.04));
  color: var(--accent-maroon);
}

.module-day-label {
  display: flex;
  align-items: baseline;
  gap: 0.65rem;
  min-width: 0;
}

.module-day-num {
  font-size: 0.8rem;
  color: var(--text-muted);
  min-width: 3rem;
  flex-shrink: 0;
}

.module-day-title {
  font-size: 0.95rem;
}

.module-day-status {
  font-size: 0.85rem;
  flex-shrink: 0;
}

.module-day-status.submitted {
  color: var(--success-text, #2d6a4f);
  font-weight: 600;
}

.module-day-status.pending {
  color: var(--text-muted);
}

.module-day-empty {
  margin: 0 0 1rem 1rem;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.module-instructor-edit {
  margin: 0 0 1rem 0;
  font-size: 0.9rem;
}

.module-instructor-edit summary {
  cursor: pointer;
  color: var(--text-muted);
  padding-bottom: 0.5rem;
}

.module-day-edit {
  margin-top: 0.75rem;
  padding: 0.75rem 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
}

.module-day-edit summary {
  padding-bottom: 0;
}

.module-day-edit[open] summary {
  padding-bottom: 0.5rem;
}

.day-edit-form textarea {
  width: 100%;
}

.day-description {
  margin: 0 0 1rem;
  color: var(--text-secondary, var(--text-muted));
  max-width: 42rem;
}

.exit-ticket-prompt {
  background: var(--surface-muted, rgba(0, 0, 0, 0.04));
  border-left: 3px solid var(--accent-maroon);
  padding: 0.85rem 1rem;
  margin: 0 0 1rem;
  border-radius: 0 6px 6px 0;
}

.exit-ticket-prompt h4 {
  margin: 0 0 0.35rem;
  font-size: 0.9rem;
  color: var(--accent-maroon);
}

.exit-ticket-prompt p {
  margin: 0;
  white-space: pre-wrap;
  line-height: 1.5;
}

.instructor-card {
  display: flex;
  gap: 1.25rem;
  align-items: flex-start;
}

.instructor-avatar {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: var(--accent-maroon);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 700;
  flex-shrink: 0;
}

.instructor-placeholder {
  color: var(--text-muted);
  font-style: italic;
}

.instructor-reflection {
  margin: 1.25rem 0;
  border-left: 3px solid var(--accent-maroon);
}

.instructor-reflection h2,
.instructor-reflection h3 {
  margin-top: 0;
}

.exit-ticket-box {
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 2px solid var(--border-soft);
}

.exit-ticket-box h3 {
  color: var(--accent-maroon);
}

.exit-ticket-note {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.teacher-panel {
  background: #f0e8dc;
  border: 1px dashed var(--border-soft);
  border-radius: var(--radius);
  padding: 1.25rem;
  margin-bottom: 1.5rem;
}

.teacher-panel h3 {
  margin-bottom: 0.75rem;
  font-size: 1rem;
}

.video-admin-item {
  padding: 0.75rem 0;
}

.video-admin-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
  margin-top: 0.75rem;
}

.video-admin-actions form {
  display: inline;
}

.inline-form {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: flex-end;
  margin-top: 0.75rem;
}

.inline-form .form-group {
  margin-bottom: 0;
  flex: 1;
  min-width: 140px;
}

.table-wrap {
  overflow-x: auto;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}

.data-table th,
.data-table td {
  text-align: left;
  padding: 0.65rem 0.75rem;
  border-bottom: 1px solid var(--border-soft);
}

.data-table th {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 600;
}

.empty-state {
  color: var(--text-muted);
  font-style: italic;
  padding: 1.5rem 0;
}

.slides-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  margin: 1rem 0;
  font-weight: 600;
}

.slides-panel {
  margin: 0 0 1.5rem;
  padding: 1rem 1.25rem;
  border-left: 4px solid var(--accent-maroon);
}

.slides-panel-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.slides-panel-title {
  margin: 0 0 0.25rem;
  font-size: 1.05rem;
}

.slides-open-btn {
  flex-shrink: 0;
  white-space: nowrap;
}

.module-day-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 0.15rem;
}

.module-day-row .module-day-link {
  flex: 1;
  min-width: 0;
}

.module-slides-btn {
  flex-shrink: 0;
  margin: 0.15rem 0.75rem 0.15rem 0;
}

.toggle-group {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.toggle-option {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}
.syllabus-text {
  white-space: pre-wrap;
  line-height: 1.65;
}

/* ---- Data Center shell (three-column) ---- */

.dc-shell {
  display: flex;
  min-height: 100vh;
}

.dc-main-wrap {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.dc-body {
  display: flex;
  flex: 1;
  min-height: 0;
}

.dc-content {
  flex: 1;
  padding: 1.75rem 2rem 2.5rem;
  min-width: 0;
  max-width: 780px;
}

.dc-lesson-rail {
  width: 280px;
  flex-shrink: 0;
  background: var(--sidebar-bg);
  border-left: 1px solid var(--border-soft);
  padding: 1.25rem 1rem 2rem;
  overflow-y: auto;
}

.lesson-rail-title {
  font-family: var(--font-serif);
  font-size: 1rem;
  color: var(--accent-maroon);
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-soft);
}

.lesson-week {
  margin-bottom: 1.25rem;
}

.lesson-week-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 0.35rem;
  line-height: 1.3;
}

.lesson-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.lesson-item a {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  padding: 0.4rem 0.35rem;
  border-radius: 6px;
  color: var(--text-primary);
  font-size: 0.88rem;
  line-height: 1.35;
}

.lesson-item a:hover {
  background: rgba(139, 58, 58, 0.06);
  text-decoration: none;
}

.lesson-item.lesson-current a {
  background: rgba(139, 58, 58, 0.1);
  font-weight: 600;
  color: var(--accent-maroon);
}

.lesson-check {
  width: 18px;
  height: 18px;
  border: 2px solid var(--border-soft);
  border-radius: 50%;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.65rem;
  color: var(--success-text);
  margin-top: 2px;
}

.lesson-check.watched {
  background: var(--success-bg);
  border-color: var(--success-text);
}

.lesson-week-locked .lesson-week-label,
.lesson-link-locked {
  color: var(--text-muted);
}

.lesson-link-locked {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  padding: 0.4rem 0.35rem;
  font-size: 0.88rem;
  line-height: 1.35;
  opacity: 0.6;
  cursor: not-allowed;
}

.lesson-lock-note {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin: 0 0 0.35rem;
  line-height: 1.35;
}

.lock-icon {
  font-size: 0.8em;
  margin-right: 0.15rem;
}

.module-locked {
  opacity: 0.75;
}

.module-item-locked {
  color: var(--text-muted);
  cursor: not-allowed;
}

.lesson-day-num {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  min-width: 2.25rem;
  margin-right: 0.15rem;
}

.video-placeholder {
  background: #2a2520;
  color: #c8c0b4;
  border-radius: var(--radius);
  min-height: 320px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
  font-family: var(--font-serif);
  font-size: 1.25rem;
  letter-spacing: 0.08em;
}

.video-player-wrap {
  margin-bottom: 1.25rem;
  border-radius: var(--radius);
  overflow: hidden;
  background: #2a2520;
}

.video-player {
  display: block;
  width: 100%;
  max-height: 70vh;
  background: #000;
}

.video-unavailable {
  background: var(--surface);
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  padding: 2rem 1.5rem;
  margin-bottom: 1.25rem;
  text-align: center;
  color: var(--text-muted);
}

.video-unavailable p {
  margin: 0 0 0.5rem;
}

/* --- PDF document viewer (parallel to the lesson video player) --- */

.doc-viewer {
  margin-bottom: 1.25rem;
}

.doc-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
  padding: 0.65rem 0.85rem;
  border: 1px solid var(--border-soft);
  border-radius: var(--radius) var(--radius) 0 0;
  background: var(--rail-bg);
}

.doc-toolbar .doc-status {
  margin: 0;
}

.doc-audio {
  display: block;
  width: 100%;
  border-radius: 0;
  background: var(--rail-bg);
  border: 1px solid var(--border-soft);
  border-top: 0;
}

.doc-body {
  padding: 1.25rem;
  border: 1px solid var(--border-soft);
  border-top: 0;
  border-radius: 0 0 var(--radius) var(--radius);
  background: var(--bg-cream);
  max-height: 70vh;
  overflow: auto;
}

/* Full screen: native Fullscreen API, or a fixed overlay where it is unsupported */
.doc-viewer.is-fullscreen {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  flex-direction: column;
  margin: 0;
  background: var(--bg-cream);
}

.doc-viewer.is-fullscreen::backdrop {
  background: var(--bg-cream);
}

.doc-viewer.is-fullscreen .doc-toolbar {
  border-radius: 0;
  border-left: 0;
  border-right: 0;
  border-top: 0;
}

.doc-viewer.is-fullscreen .doc-audio {
  border-left: 0;
  border-right: 0;
}

.doc-viewer.is-fullscreen .doc-body {
  flex: 1;
  max-height: none;
  border: 0;
  border-radius: 0;
  padding: 1.5rem 2rem;
}

.doc-fullscreen-lock,
.doc-fullscreen-lock body {
  overflow: hidden;
}

.doc-body[aria-busy="true"]::before {
  content: "Loading document…";
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* Each PDF page keeps PyMuPDF's absolute layout; the app supplies the rules
   that normally live in the <head> of a standalone PyMuPDF export. */
.pdf-page {
  display: block;
  margin: 0 auto 1.25rem;
  overflow: hidden;
}

.pdf-page:last-child {
  margin-bottom: 0;
}

.pdf-page-canvas {
  position: relative;
  background: #fff;
  border: 1px solid var(--border-soft);
  border-radius: 4px;
  box-shadow: 0 1px 4px rgba(61, 52, 41, 0.12);
  transform-origin: top left;
  overflow: hidden;
}

.pdf-draw {
  position: absolute;
  pointer-events: none;
  z-index: 0;
}

.pdf-page-canvas p {
  position: absolute;
  white-space: pre;
  margin: 0;
  z-index: 1;
}

.pdf-page-canvas img {
  max-width: none;
  z-index: 1;
}

.video-placeholder-note {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  color: #8a8278;
  margin: 0.5rem 0 0;
  letter-spacing: normal;
}

.progress-bar-lg {
  max-width: 100%;
  height: 10px;
}

.division-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.division-list li {
  padding: 1rem 0;
  border-bottom: 1px solid var(--border-soft);
}

.division-list li:last-child {
  border-bottom: none;
}

.division-desc {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin: 0.35rem 0;
}

.grade-lesson-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.grade-lesson-row {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0.55rem 0;
  border-bottom: 1px solid var(--border-soft);
}

.grade-lesson-row:last-child {
  border-bottom: none;
}

.grade-status {
  margin-left: auto;
}

.roster-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1rem;
}

.roster-cohort-section {
  margin-bottom: 2.5rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--border-soft);
}

.roster-cohort-section:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
}

.roster-cohort-header {
  margin-bottom: 1.25rem;
}

.roster-cohort-header h2 {
  margin: 0 0 0.25rem;
}

.roster-subheading {
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  margin: 0 0 0.75rem;
}

.roster-leaders-grid {
  margin-bottom: 1.5rem;
}

.roster-leaders-grid .roster-card,
.roster-leader-card {
  border-color: var(--accent, #8b2942);
}

.roster-no-leader {
  margin-bottom: 1.25rem;
}

.sidebar-divider {
  border: none;
  border-top: 1px solid var(--border-soft);
  margin: 0.75rem 1.25rem;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

/* ---- Messenger ---- */

.dc-messenger-shell {
  min-height: 100vh;
}

.messenger-channels {
  width: 240px;
  background: var(--sidebar-bg);
  border-right: 1px solid var(--border-soft);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
}

.messenger-channels-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem;
  border-bottom: 1px solid var(--border-soft);
}

.messenger-flashes {
  padding: 0.75rem 1.5rem 0;
}

.messenger-help {
  font-size: 0.85rem;
  color: var(--text-muted);
  padding: 0 1rem 0.75rem;
  margin: 0;
  line-height: 1.4;
}

.channel-section-label {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  padding: 0.75rem 0.75rem 0.25rem;
}

.messenger-new-dm {
  padding: 1rem;
  border-top: 1px solid var(--border-soft);
  margin-top: auto;
}

.messenger-new-dm h3 {
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
}

.member-list li {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem;
}

.member-dm-form {
  margin-left: auto;
}

.member-dm-form .btn {
  padding: 0.15rem 0.5rem;
  font-size: 0.75rem;
}

.channel-list {
  display: flex;
  flex-direction: column;
  padding: 0.5rem;
  overflow-y: auto;
}

.channel-link {
  display: block;
  padding: 0.6rem 0.75rem;
  border-radius: 8px;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

.channel-link:hover {
  background: rgba(139, 58, 58, 0.06);
  text-decoration: none;
}

.channel-link.active {
  background: rgba(139, 58, 58, 0.12);
  color: var(--accent-maroon);
  font-weight: 600;
}

.channel-type {
  display: block;
  font-size: 0.7rem;
  text-transform: uppercase;
  color: var(--text-muted);
  letter-spacing: 0.04em;
}

.messenger-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.messenger-body {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 0;
}

.messenger-messages {
  flex: 1;
  overflow-y: auto;
  padding: 1.25rem 1.5rem;
}

.message {
  margin-bottom: 1rem;
  max-width: 85%;
}

.message-own {
  margin-left: auto;
  text-align: right;
}

.message-meta {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 0.25rem;
}

.message-meta strong {
  color: var(--text-primary);
  margin-right: 0.5rem;
}

.message-body {
  background: var(--bg-card);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  padding: 0.65rem 0.85rem;
  margin: 0;
  white-space: pre-wrap;
  text-align: left;
}

.message-own .message-body {
  background: rgba(139, 58, 58, 0.08);
  border-color: rgba(139, 58, 58, 0.2);
}

.message-delete-form {
  margin-top: 0.35rem;
}

.messenger-compose {
  display: flex;
  gap: 0.75rem;
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--border-soft);
  background: var(--bg-card);
  align-items: flex-end;
}

.messenger-members {
  width: 200px;
  border-left: 1px solid var(--border-soft);
  padding: 1rem;
  background: var(--sidebar-bg);
  flex-shrink: 0;
  overflow-y: auto;
}

.messenger-members h3 {
  font-size: 0.95rem;
  margin-bottom: 0.75rem;
}

.member-list {
  list-style: none;
  padding: 0;
  margin: 0;
  font-size: 0.9rem;
}

.member-list li {
  padding: 0.35rem 0;
}

.messenger-empty {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}

@media (max-width: 1100px) {
  .dc-lesson-rail {
    display: none;
  }

  .messenger-members {
    display: none;
  }
}

/* ---- DC student home dashboard ---- */

.dc-dashboard {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.dc-section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.75rem;
}

.dc-section-header h2 {
  margin-bottom: 0;
}

.dc-week-path {
  list-style: none;
  padding: 0;
  margin: 0 0 1.25rem;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(0, 1fr));
  gap: 0.45rem;
}

.dc-week-step {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  min-height: 4.25rem;
  padding: 0.5rem 0.4rem;
  border-radius: 8px;
  border: 1px solid var(--border-soft);
  background: var(--bg-card);
  text-align: center;
}

.dc-week-step-num {
  flex-shrink: 0;
  width: 1.35rem;
  height: 1.35rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.75rem;
  background: var(--badge-bg);
  color: var(--text-muted);
}

.dc-week-step-label {
  width: 100%;
  font-size: 0.65rem;
  font-weight: 500;
  line-height: 1.3;
  color: var(--text-muted);
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 3;
  overflow: hidden;
  overflow-wrap: break-word;
  hyphens: auto;
}

.dc-week-step.done {
  border-color: rgba(45, 90, 45, 0.35);
  background: var(--success-bg);
}

.dc-week-step.done .dc-week-step-num {
  background: var(--success-text);
  color: #fff;
}

.dc-week-step.done .dc-week-step-label {
  color: var(--success-text);
}

.dc-week-step.current {
  border-color: var(--accent-maroon);
  background: rgba(139, 58, 58, 0.06);
  box-shadow: 0 0 0 1px rgba(139, 58, 58, 0.08);
}

.dc-week-step.current .dc-week-step-num {
  background: var(--accent-maroon);
  color: #fff;
}

.dc-week-step.current .dc-week-step-label {
  color: var(--accent-maroon);
  font-weight: 600;
}

.dc-week-step.locked {
  opacity: 0.55;
  border-style: dashed;
}

.dc-week-step.locked .dc-week-step-num {
  background: transparent;
  font-size: 0.7rem;
}

.dc-week-gate-note {
  font-size: 0.85rem;
  color: var(--text-muted);
  background: var(--badge-bg);
  border-radius: 8px;
  padding: 0.5rem 0.75rem;
  margin: 0.75rem 0;
}

.dc-message-preview-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.dc-message-preview-list li + li {
  margin-top: 0.5rem;
}

.dc-message-preview {
  display: block;
  padding: 0.75rem;
  border-radius: var(--radius);
  border: 1px solid var(--border-soft);
  background: var(--bg-cream);
  color: var(--text-primary);
}

.dc-message-preview:hover {
  border-color: var(--accent-maroon);
  text-decoration: none;
}

.dc-message-preview-meta {
  display: block;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 0.35rem;
}

.dc-message-preview-body {
  display: block;
  font-size: 0.95rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.dc-bio-form textarea {
  min-height: 6rem;
}

.dc-branch-options {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

.dc-branch-option {
  display: block;
  cursor: pointer;
}

.dc-branch-option input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.dc-branch-option-body {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding: 1rem;
  border-radius: var(--radius);
  border: 2px solid var(--border-soft);
  background: var(--bg-cream);
  min-height: 100%;
  transition: border-color 0.15s, background 0.15s;
}

.dc-branch-option-body strong {
  font-family: var(--font-serif);
  color: var(--text-primary);
}

.dc-branch-option-body span:last-child {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.4;
}

.dc-branch-option input:checked + .dc-branch-option-body {
  border-color: var(--accent-maroon);
  background: rgba(139, 58, 58, 0.06);
}

.dc-branch-option:hover .dc-branch-option-body {
  border-color: var(--accent-maroon);
}

@media (max-width: 700px) {
  .dc-branch-options {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 960px) {
  .dc-week-path {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 560px) {
  .dc-week-path {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* ---- Admin dashboard stats ---- */

.dc-stat-row {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
  margin-top: 1rem;
}

.dc-stat {
  display: flex;
  flex-direction: column;
  min-width: 7rem;
}

.dc-stat-value {
  font-family: var(--font-serif);
  font-size: 1.75rem;
  font-weight: 600;
  color: var(--accent-maroon);
  line-height: 1.1;
}

.dc-stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

/* ---- Admin video upload ---- */

.video-upload-section {
  margin: 1rem 0;
  padding: 0.85rem;
  border-radius: var(--radius);
  border: 1px dashed var(--border-soft);
  background: var(--bg-cream);
}

.video-upload-heading {
  font-size: 0.95rem;
  margin: 0 0 0.65rem;
}

.video-upload-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
}

.video-upload-label {
  cursor: pointer;
  margin: 0;
}

.video-upload-status {
  margin: 0.5rem 0 0;
  min-height: 1.25rem;
}

.video-admin-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
  margin-top: 0.75rem;
}

.video-admin-item {
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-soft);
  margin-bottom: 1rem;
}

.video-admin-item:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

/* ---- Help Desk ---- */

.helpdesk-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 0;
  flex-wrap: wrap;
}

.helpdesk-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
}

.helpdesk-thread {
  padding: 0;
  overflow: hidden;
}

.helpdesk-thread .messenger-messages {
  max-height: 28rem;
}

.helpdesk-compose {
  border-radius: 0 0 var(--radius) var(--radius);
}