/* Teacher portal theme: light, fast, edtech startup style */
body.teacher-panel {
  margin: 0;
  color: #0f172a;
  background:
    radial-gradient(circle at top left, rgba(37, 99, 235, 0.08), transparent 34%),
    radial-gradient(circle at top right, rgba(14, 165, 233, 0.06), transparent 30%),
    linear-gradient(180deg, #f7faff 0%, #ffffff 42%, #f8fbff 100%);
  font-family: Inter, "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-size: 14px;
  line-height: 1.45;
}

body.teacher-panel * {
  box-sizing: border-box;
}

body.teacher-panel a {
  color: inherit;
}

body.teacher-panel .site-header {
  background: linear-gradient(90deg, #1d4ed8 0%, #2563eb 100%);
  border-bottom: 1px solid #1e40af;
  box-shadow: 0 6px 18px rgba(29, 78, 216, 0.18);
  backdrop-filter: none;
}

body.teacher-panel .header-inner {
  max-width: 1520px;
  padding: 10px 16px;
}

body.teacher-panel .publisher-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

body.teacher-panel .pub-name {
  margin: 0;
  font-size: 16px;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: #ffffff;
}

body.teacher-panel .pub-panel {
  margin: 0;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: rgba(255, 255, 255, 0.82);
}

body.teacher-panel .user-controls {
  gap: 10px;
}

body.teacher-panel .user-name {
  font-weight: 700;
  color: #ffffff;
}

body.teacher-panel .logout-button {
  background: rgba(255, 255, 255, 0.14);
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.22);
  box-shadow: none;
  min-height: 34px;
  padding: 7px 10px;
  border-radius: 10px;
  font-size: 12px;
  font-weight: 800;
}

body.teacher-panel .logout-button:hover {
  background: rgba(255, 255, 255, 0.22);
}

body.teacher-panel .main-grid {
  max-width: 1520px;
  margin: 0 auto;
  padding: 12px 16px 18px;
  gap: 12px;
  grid-template-columns: 240px minmax(0, 1fr);
}

body.teacher-panel .subject-nav,
body.teacher-panel #loader,
body.teacher-panel .card,
body.teacher-panel .side-card,
body.teacher-panel .book-detail.card,
body.teacher-panel .chapter-card.card,
body.teacher-panel .lesson-plan-item {
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid #e6eef8;
  box-shadow: 0 10px 30px rgba(15, 23, 42, 0.05);
}

body.teacher-panel .subject-nav,
body.teacher-panel .side-panel {
  border-radius: 18px;
  box-shadow: 0 16px 40px rgba(15, 23, 42, 0.06);
}

body.teacher-panel .subject-nav {
  padding: 12px;
}

body.teacher-panel .subject-nav h4,
body.teacher-panel .side-panel h3,
body.teacher-panel .subject-section h3,
body.teacher-panel .section-title {
  margin-top: 0;
  color: #0f172a;
  letter-spacing: -0.02em;
}

body.teacher-panel .subject-nav h4 {
  margin-bottom: 10px;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: #64748b;
}

body.teacher-panel .subject-list {
  gap: 5px;
}

body.teacher-panel .subject-list li {
  padding: 8px 10px;
  border-radius: 12px;
  font-weight: 700;
  font-size: 13px;
  color: #334155;
}

body.teacher-panel .subject-list li:hover {
  background: #eff6ff;
  border-color: #dbeafe;
  transform: translateY(-1px);
}

body.teacher-panel .subject-list li.active {
  color: #fff;
  background: linear-gradient(90deg, #1d4ed8 0%, #2563eb 100%);
  box-shadow: 0 10px 20px rgba(37, 99, 235, 0.16);
}

body.teacher-panel .subject-badge {
  background: rgba(37, 99, 235, 0.08);
  color: #1d4ed8;
}

body.teacher-panel .center {
  min-width: 0;
}

body.teacher-panel .content-head {
  margin: 0 0 12px;
}

body.teacher-panel .search input {
  width: 280px;
  max-width: 100%;
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid #dbeafe;
  border-radius: 10px;
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.03);
  padding: 8px 10px;
  font-size: 13px;
}

body.teacher-panel #loader {
  margin-bottom: 12px;
  padding: 10px 12px;
  border-radius: 14px;
  font-size: 13px;
}

body.teacher-panel .book-grid {
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 12px;
}

body.teacher-panel .card {
  overflow: hidden;
  border-radius: 14px;
  display: flex;
  flex-direction: column;
  gap: 0;
  cursor: pointer;
  transition: transform 0.16s ease, box-shadow 0.16s ease, border-color 0.16s ease;
}

body.teacher-panel .card:hover {
  transform: translateY(-3px);
  box-shadow: 0 16px 32px rgba(15, 23, 42, 0.08);
  border-color: #cfe0fb;
}

body.teacher-panel .card-thumb img {
  width: 100%;
  height: 156px;
  object-fit: cover;
  display: block;
}

body.teacher-panel .card-body {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 10px;
}

body.teacher-panel .card-title {
  margin: 0;
  font-size: 0.92rem;
  font-weight: 800;
  line-height: 1.35;
  color: #0f172a;
}

body.teacher-panel .card-meta {
  margin: 0;
  color: #64748b;
  font-size: 0.78rem;
  line-height: 1.4;
}

body.teacher-panel .card-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 2px;
}

body.teacher-panel .card-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 32px;
  padding: 7px 10px;
  border-radius: 999px;
  text-decoration: none;
  font-size: 11px;
  font-weight: 800;
  line-height: 1;
  white-space: nowrap;
}

body.teacher-panel .res-btn,
body.teacher-panel .view-chip,
body.teacher-panel .theme-chip,
body.teacher-panel .logout-button,
body.teacher-panel .card-action {
  position: relative;
}

body.teacher-panel .res-btn[data-icon]::before,
body.teacher-panel .view-chip[data-icon]::before,
body.teacher-panel .theme-chip[data-icon]::before,
body.teacher-panel .logout-button[data-icon]::before,
body.teacher-panel .card-action[data-icon]::before {
  content: attr(data-icon);
  display: inline-block;
  margin-right: 6px;
  font-size: 0.95em;
  line-height: 1;
}

body.teacher-panel .card-action.primary {
  background: linear-gradient(90deg, #1d4ed8 0%, #2563eb 100%);
  color: #fff;
}

body.teacher-panel .card-action.secondary {
  background: #fff;
  color: #1d4ed8;
  border: 1px solid #dbeafe;
}

body.teacher-panel .card-action:hover {
  transform: translateY(-1px);
}

body.teacher-panel .side-panel {
  padding: 16px;
  display: none;
}

body.teacher-panel .side-panel h3 {
  margin-bottom: 10px;
  font-size: 15px;
}

body.teacher-panel .panel-buttons {
  gap: 10px;
}

body.teacher-panel details {
  background: #fff;
  border: 1px solid #e6eef8;
  border-radius: 14px;
}

body.teacher-panel summary {
  color: #1d4ed8;
  padding: 12px 14px;
}

body.teacher-panel .details-body {
  background: #f8fbff;
  color: #475569;
}

body.teacher-panel .support-links a {
  background: #fff;
  color: #1d4ed8;
  border-color: #dbeafe;
}

body.teacher-panel .empty {
  margin-top: 12px;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.84);
  border-color: #e6eef8;
  color: #64748b;
}

body.teacher-panel .brand-bar {
  gap: 8px;
  margin: 12px 0 16px;
}

body.teacher-panel .brand-btn {
  padding: 8px 12px;
  border-radius: 999px;
  border: 1px solid #dbeafe;
  background: rgba(255, 255, 255, 0.9);
  color: #334155;
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.03);
}

body.teacher-panel .brand-btn:hover {
  background: #eff6ff;
  border-color: #bfdbfe;
  color: #1d4ed8;
}

body.teacher-panel .brand-btn.active {
  background: linear-gradient(90deg, #1d4ed8 0%, #2563eb 100%);
  color: #fff;
  border-color: transparent;
}

body.teacher-panel .brand-btn.brand-disabled {
  background: #f8fafc;
  color: #94a3b8;
}

body.teacher-panel .page-title {
  margin: 8px 0 0;
  font-size: 1.7rem;
  font-weight: 900;
  letter-spacing: -0.03em;
  color: #0f172a;
}

body.teacher-panel .back-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  justify-content: space-between;
  margin-top: 4px;
}

body.teacher-panel .back-link {
  text-decoration: none;
  font-weight: 700;
  color: #1d4ed8;
}

body.teacher-panel .page-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

body.teacher-panel .page-tag {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  padding: 6px 10px;
  border-radius: 999px;
  background: #eff6ff;
  border: 1px solid #dbeafe;
  color: #1d4ed8;
  font-size: 12px;
  font-weight: 800;
}

body.teacher-panel .page-layout {
  display: grid;
  grid-template-columns: var(--sidebar-w, 320px) minmax(0, 1fr);
  gap: 16px;
  align-items: start;
  margin-top: 16px;
}

body.teacher-panel .side-card {
  border-radius: 16px;
  padding: 14px;
}

body.teacher-panel .side-title {
  margin-bottom: 10px;
  font-size: 14px;
  color: #0f172a;
}

body.teacher-panel .toggle-btn {
  color: #1d4ed8;
}

body.teacher-panel .sidebar .search input {
  border-radius: 12px;
  border: 1px solid #dbeafe;
}

body.teacher-panel .book-list {
  gap: 8px;
  max-height: calc(100vh - 260px);
}

body.teacher-panel .book-item {
  padding: 8px;
  border-radius: 12px;
  border-color: transparent;
}

body.teacher-panel .book-item:hover {
  background: #f8fbff;
  transform: translateY(-1px);
}

body.teacher-panel .book-item.active {
  background: #eff6ff;
  border-color: #dbeafe;
  box-shadow: 0 8px 20px rgba(37, 99, 235, 0.06);
}

body.teacher-panel .book-item img {
  border-radius: 8px;
  border-color: #edf2f7;
}

body.teacher-panel .bi-title {
  color: #0f172a;
}

body.teacher-panel .bi-sub {
  color: #64748b;
}

body.teacher-panel .book-badge {
  background: #dbeafe;
  color: #1d4ed8;
}

body.teacher-panel .content {
  min-width: 0;
}

body.teacher-panel .book-detail.card {
  display: flex;
  gap: 16px;
  padding: 18px;
  border-radius: 18px;
  align-items: flex-start;
}

body.teacher-panel .book-cover-wrap {
  flex: 0 0 150px;
}

body.teacher-panel .book-cover {
  width: 150px;
  height: 200px;
  object-fit: cover;
  border-radius: 14px;
  border: 1px solid #e6eef8;
}

body.teacher-panel .book-title {
  margin: 0;
  font-size: 1.7rem;
  line-height: 1.2;
  color: #0f172a;
  letter-spacing: -0.03em;
}

body.teacher-panel .book-meta-line {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 10px;
}

body.teacher-panel .meta {
  min-width: 180px;
  padding: 10px 12px;
  border-radius: 14px;
  background: #f8fbff;
  border: 1px solid #e6eef8;
}

body.teacher-panel .meta strong {
  display: block;
  color: #64748b;
  margin-bottom: 4px;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

body.teacher-panel .meta span {
  color: #0f172a;
  font-weight: 700;
}

body.teacher-panel .book-description {
  color: #475569;
  margin: 12px 0 0;
  line-height: 1.55;
}

body.teacher-panel .resources {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}

body.teacher-panel .res-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 8px 10px;
  min-height: 32px;
  border-radius: 999px;
  background: #eff6ff;
  border: 1px solid #dbeafe;
  color: #1d4ed8;
  text-decoration: none;
  font-weight: 800;
  font-size: 11px;
}

body.teacher-panel .res-btn:hover {
  background: #dbeafe;
}

body.teacher-panel .section-title {
  margin: 18px 0 10px;
  font-size: 1rem;
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #64748b;
}

body.teacher-panel .chapters-grid {
  gap: 12px;
}

body.teacher-panel .chapter-card {
  padding: 14px;
  border-radius: 18px;
}

body.teacher-panel .chapter-card-head {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: flex-start;
  width: 100%;
}

body.teacher-panel .chapter-card-body {
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid #eef2f7;
}

body.teacher-panel .chapter-title {
  margin: 0;
  font-size: 1.02rem;
  font-weight: 800;
  color: #0f172a;
}

body.teacher-panel .chapter-sub {
  margin-top: 4px;
  color: #64748b;
  font-size: 0.9rem;
}

body.teacher-panel .lesson-plan-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  margin-bottom: 10px;
  font-weight: 800;
  color: #1d4ed8;
}

body.teacher-panel .lesson-plan-label {
  display: inline-flex;
  align-items: center;
  padding: 4px 8px;
  border-radius: 999px;
  background: #eff6ff;
  color: #1d4ed8;
  font-size: 11px;
  font-weight: 800;
}

body.teacher-panel .lesson-plan-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

body.teacher-panel .lesson-plan-item {
  padding: 12px;
  border-radius: 14px;
}

body.teacher-panel .lesson-plan-meta {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
  font-size: 0.92rem;
  color: #334155;
}

body.teacher-panel .lesson-plan-meta strong,
body.teacher-panel .lesson-plan-block strong {
  color: #0f172a;
}

body.teacher-panel .lesson-plan-block {
  margin-top: 10px;
  padding: 10px 12px;
  border-radius: 12px;
  background: #f8fbff;
  border: 1px solid #e6eef8;
  color: #475569;
  line-height: 1.5;
}

body.teacher-panel .lesson-plan-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 10px;
}

body.teacher-panel .lesson-plan-empty {
  padding: 12px;
  border-radius: 12px;
  background: #f8fbff;
  border: 1px dashed #dbeafe;
  color: #64748b;
}

body.teacher-panel .img-wrapper {
  width: 100%;
  height: 180px;
  border-radius: 12px;
  background: linear-gradient(90deg, #eef4fb 0%, #f8fbff 50%, #eef4fb 100%);
  background-size: 200% 100%;
  animation: shimmer 1.2s linear infinite;
  overflow: hidden;
}

body.teacher-panel .img-wrapper img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: none;
}

@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

@media (max-width: 1100px) {
  body.teacher-panel .main-grid,
  body.teacher-panel .page-layout {
    grid-template-columns: 1fr;
  }

  body.teacher-panel .subject-nav,
  body.teacher-panel .side-panel,
  body.teacher-panel .sidebar {
    position: relative;
    top: auto;
    height: auto;
  }

  body.teacher-panel .center {
    height: auto;
    overflow: visible;
  }

  body.teacher-panel .book-detail.card {
    flex-direction: column;
  }

  body.teacher-panel .book-cover-wrap {
    flex-basis: auto;
  }

  body.teacher-panel .lesson-plan-meta {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 700px) {
  body.teacher-panel .header-inner {
    padding: 10px 14px;
  }

  body.teacher-panel .main-grid {
    padding: 12px 14px 18px;
  }

  body.teacher-panel .search input,
  body.teacher-panel .content-head h2 {
    width: 100%;
  }

  body.teacher-panel .content-head {
    flex-direction: column;
    align-items: stretch;
  }

  body.teacher-panel .page-title {
    font-size: 1.35rem;
  }

  body.teacher-panel .lesson-plan-meta,
  body.teacher-panel .book-meta-line {
    grid-template-columns: 1fr;
  }
}