/* CBSE Study Hub — Official Books, tabs, lecture board, Word Hunt */

.cbse-tab-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 20px;
  padding: 4px;
  background: rgba(15, 23, 42, 0.55);
  border-radius: 14px;
  border: 1px solid rgba(148, 163, 184, 0.15);
}

.cbse-tab {
  flex: 1 1 140px;
  min-width: 120px;
  padding: 10px 12px;
  border: none;
  border-radius: 10px;
  background: transparent;
  color: #94a3b8;
  cursor: pointer;
  text-align: left;
  transition: background 0.2s, color 0.2s, transform 0.15s;
}

.cbse-tab:hover {
  background: rgba(51, 65, 85, 0.5);
  color: #e2e8f0;
}

.cbse-tab.active {
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.25), rgba(129, 140, 248, 0.2));
  color: #f8fafc;
  box-shadow: 0 0 0 1px rgba(56, 189, 248, 0.35);
}

.cbse-tab-icon {
  display: block;
  font-size: 1.25rem;
  margin-bottom: 4px;
}

.cbse-tab-label {
  display: block;
  font-weight: 600;
  font-size: 0.82rem;
}

.cbse-tab-hint {
  display: block;
  font-size: 0.68rem;
  opacity: 0.75;
  margin-top: 2px;
}

#phaseStudy {
  max-width: 1100px;
  margin: 0 auto;
}

.cbse-study-header {
  margin-bottom: 16px;
}

.cbse-study-header h2 {
  margin: 0 0 4px;
  font-size: 1.35rem;
  color: #f1f5f9;
}

.cbse-study-header p {
  margin: 0;
  color: #94a3b8;
  font-size: 0.88rem;
}

#studyTabPanel {
  min-height: 320px;
}

/* Official book spread */
.cbse-book-stage {
  margin-bottom: 24px;
}

.cbse-book-cover {
  text-align: center;
  padding: 20px;
  margin-bottom: 16px;
  background: linear-gradient(145deg, rgba(30, 41, 59, 0.9), rgba(15, 23, 42, 0.95));
  border-radius: 16px;
  border: 1px solid rgba(251, 191, 36, 0.25);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.35);
}

.cbse-book-badge {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: #fbbf24;
  background: rgba(251, 191, 36, 0.12);
  padding: 4px 10px;
  border-radius: 999px;
  margin-bottom: 8px;
}

.cbse-book-cover h3 {
  margin: 0 0 6px;
  color: #fef3c7;
  font-size: 1.2rem;
}

.cbse-book-code {
  color: #94a3b8;
  font-size: 0.85rem;
}

.cbse-pdf-link,
.cbse-open-book {
  margin-top: 12px;
  display: inline-block;
}

/* In-app official book reader */
.cbse-book-reader {
  margin-bottom: 20px;
  background: linear-gradient(180deg, rgba(30, 41, 59, 0.95), rgba(15, 23, 42, 0.98));
  border-radius: 14px;
  border: 1px solid rgba(251, 191, 36, 0.2);
  overflow: hidden;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.35);
}

.cbse-book-reader-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  background: rgba(15, 23, 42, 0.85);
  border-bottom: 1px solid rgba(148, 163, 184, 0.12);
  font-size: 0.82rem;
  color: #cbd5e1;
}

.cbse-book-reader-title {
  font-weight: 600;
  color: #fef3c7;
}

.cbse-book-scroll {
  max-height: min(72vh, 640px);
  overflow-y: auto;
  overflow-x: hidden;
  padding: 16px 12px 20px;
  background: #e2e8f0;
  scroll-behavior: smooth;
}

.cbse-book-page-wrap {
  margin: 0 auto 16px;
  max-width: 100%;
  background: #fff;
  border-radius: 4px;
  box-shadow: 0 4px 18px rgba(15, 23, 42, 0.18);
  overflow: hidden;
}

.cbse-book-page-canvas {
  display: block;
  width: 100%;
  height: auto;
  margin: 0 auto;
}

.cbse-book-reader-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 8px 12px;
  background: rgba(15, 23, 42, 0.9);
  border-top: 1px solid rgba(148, 163, 184, 0.1);
}

.cbse-book-scroll-hint {
  flex: 1;
  text-align: center;
  font-size: 0.72rem;
  color: #64748b;
}

.cbse-book-loading,
.cbse-book-error {
  text-align: center;
  padding: 48px 20px;
  color: #475569;
  font-size: 0.9rem;
}

.cbse-book-error {
  color: #b91c1c;
}

.cbse-book-outline {
  margin-bottom: 16px;
}

.cbse-outline-details {
  background: rgba(30, 41, 59, 0.5);
  border-radius: 10px;
  border: 1px solid rgba(148, 163, 184, 0.12);
  padding: 10px 14px;
  color: #cbd5e1;
  font-size: 0.85rem;
}

.cbse-outline-details summary {
  cursor: pointer;
  font-weight: 600;
  color: #e2e8f0;
}

.cbse-outline-section {
  margin-top: 10px;
}

.cbse-outline-section h4 {
  margin: 0 0 6px;
  font-size: 0.82rem;
  color: #fef3c7;
}

.cbse-outline-section ul {
  margin: 0 0 8px;
  padding-left: 1.2rem;
}

.cbse-book-spread {
  display: grid;
  grid-template-columns: 36px 1fr 8px 1fr 36px;
  gap: 0;
  align-items: stretch;
  min-height: 220px;
  perspective: 1200px;
}

.cbse-book-page {
  background: linear-gradient(180deg, #fefce8 0%, #fef9c3 100%);
  color: #1e293b;
  padding: 18px 20px;
  border-radius: 4px 12px 12px 4px;
  font-size: 0.88rem;
  line-height: 1.55;
  box-shadow: inset 0 0 40px rgba(0, 0, 0, 0.06), 4px 4px 20px rgba(0, 0, 0, 0.25);
  overflow-y: auto;
  max-height: 280px;
}

.cbse-book-page.right {
  border-radius: 12px 4px 4px 12px;
}

.cbse-book-spine {
  background: linear-gradient(90deg, #92400e, #b45309, #92400e);
  border-radius: 2px;
  box-shadow: inset 0 0 8px rgba(0, 0, 0, 0.4);
}

.cbse-page-turn {
  align-self: center;
  width: 32px;
  height: 48px;
  border: none;
  border-radius: 8px;
  background: rgba(51, 65, 85, 0.8);
  color: #e2e8f0;
  font-size: 1.5rem;
  cursor: pointer;
}

.cbse-page-turn:hover {
  background: rgba(71, 85, 105, 0.95);
}

.cbse-page-indicator {
  text-align: center;
  font-size: 0.78rem;
  color: #64748b;
  margin-top: 8px;
}

.cbse-beat-teacher {
  color: #334155;
}

.cbse-beat-student {
  color: #475569;
  font-style: italic;
}

.cbse-beat-live {
  animation: cbse-fade-in 0.4s ease;
}

@keyframes cbse-fade-in {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* Lecture + sketch board */
.cbse-lecture-zone {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 16px;
  margin-bottom: 24px;
}

@media (max-width: 768px) {
  .cbse-lecture-zone {
    grid-template-columns: 1fr;
  }
  .cbse-book-spread {
    grid-template-columns: 1fr;
  }
  .cbse-book-spine,
  .cbse-page-turn {
    display: none;
  }
}

.cbse-sketch-wrap {
  position: relative;
  border-radius: 12px;
  overflow: hidden;
  border: 2px dashed rgba(148, 163, 184, 0.35);
  min-height: 180px;
  background: #0f172a;
}

.cbse-sketch-canvas {
  display: block;
  width: 100%;
  height: 180px;
}

.cbse-sketch-label {
  position: absolute;
  bottom: 8px;
  left: 10px;
  font-size: 0.7rem;
  color: #64748b;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.cbse-lecture-controls {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.cbse-dialogue {
  flex: 1;
  max-height: 200px;
  overflow-y: auto;
  padding: 12px;
  background: rgba(15, 23, 42, 0.6);
  border-radius: 10px;
  border: 1px solid rgba(148, 163, 184, 0.12);
  font-size: 0.85rem;
}

.cbse-lecture-done {
  color: #6ee7b7;
  font-weight: 600;
}

/* Word Hunt / hangman */
.cbse-hangman-game {
  padding: 16px;
  background: rgba(15, 23, 42, 0.5);
  border-radius: 14px;
  border: 1px solid rgba(129, 140, 248, 0.2);
}

.cbse-hangman-head h4 {
  margin: 0 0 4px;
  color: #e2e8f0;
}

.cbse-hangman-head p {
  margin: 0 0 12px;
  font-size: 0.8rem;
  color: #94a3b8;
}

.cbse-hangman-stage {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 20px;
  margin-bottom: 16px;
}

.cbse-hangman-fig {
  width: 100px;
  height: 120px;
  color: #f87171;
}

.cbse-hangman-word {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  font-family: ui-monospace, monospace;
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  color: #a5f3fc;
}

.hg-letter {
  display: inline-block;
  min-width: 1.2em;
  text-align: center;
  border-bottom: 3px solid rgba(56, 189, 248, 0.5);
  padding-bottom: 2px;
}

.hg-letter.on {
  color: #6ee7b7;
  border-color: #6ee7b7;
}

.cbse-hangman-hint {
  width: 100%;
  font-size: 0.85rem;
  color: #cbd5e1;
}

.hg-q-text {
  font-weight: 500;
  color: #e2e8f0;
  margin-bottom: 10px;
}

.hg-opts {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.hg-q-pool {
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: #64748b;
}

.cbse-hangman-status.ok {
  color: #6ee7b7;
}

.cbse-hangman-status.bad {
  color: #fca5a5;
}

.cbse-hangman-win {
  color: #6ee7b7;
  font-size: 1.1rem;
  font-weight: 600;
}

/* WIP / empty states */
.cbse-wip-panel,
.cbse-official-empty {
  text-align: center;
  padding: 48px 24px;
  color: #94a3b8;
}

.cbse-wip-icon {
  font-size: 3rem;
  display: block;
  margin-bottom: 12px;
}

.cbse-adv-solution-card {
  border: 1px solid rgba(148, 163, 184, 0.2);
  border-radius: 10px;
  padding: 12px 14px;
  margin-bottom: 12px;
  background: rgba(15, 23, 42, 0.35);
}

.cbse-adv-sol-prompt {
  margin: 0 0 8px;
  color: #e2e8f0;
  font-size: 0.92rem;
  line-height: 1.45;
}

.cbse-adv-q-marks {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  color: #5eead4;
  margin-right: 8px;
}

.cbse-adv-solutions {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

  color: #e2e8f0;
}

.cbse-advanced-lead {
  color: #94a3b8;
  font-size: 0.9rem;
  margin: 0 0 12px;
}

.cbse-plus-module {
  border: 1px solid rgba(94, 234, 212, 0.15);
  border-radius: 10px;
  padding: 14px 16px;
  margin-bottom: 14px;
  background: rgba(15, 23, 42, 0.45);
}

.cbse-plus-module-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 8px;
}

.cbse-plus-module-head h3 {
  margin: 0;
  font-size: 1rem;
}

.cbse-plus-source {
  font-size: 0.78rem;
  font-weight: 600;
  color: #5eead4;
  text-decoration: none;
}

a.cbse-plus-source:hover {
  text-decoration: underline;
}

.cbse-plus-body h4 {
  margin: 12px 0 6px;
  color: #e2e8f0;
  font-size: 0.92rem;
}

.cbse-plus-tags {
  margin-top: 10px;
  font-size: 0.88rem;
}

.cbse-plus-tags strong {
  display: block;
  color: #94a3b8;
  margin-bottom: 4px;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.cbse-plus-resources a {
  font-size: 0.88rem;
}

.cbse-adv-q-marks {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  color: #5eead4;
  margin-right: 6px;
}

.cbse-advanced-q-list li {
  margin-bottom: 10px;
}

.cbse-concept-list {
  margin: 12px 0 20px;
  padding-left: 1.2rem;
  color: #cbd5e1;
}

.cbse-advanced-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 12px;
}

.cbse-adv-card {
  padding: 14px;
  background: rgba(30, 41, 59, 0.6);
  border-radius: 10px;
  border: 1px solid rgba(148, 163, 184, 0.1);
  font-size: 0.85rem;
  color: #94a3b8;
}

.cbse-adv-card strong {
  display: block;
  color: #e2e8f0;
  margin-bottom: 6px;
}

.cbse-practice-embed .sr-eval-layout {
  grid-template-columns: 1fr;
}

body.cbse-study-active .sr-corner-orbs {
  display: flex !important;
}

/* ManjuLAB WordHunter */
.manjulab-launcher {
  max-width: 640px;
  margin: 0 auto;
}

.manjulab-brand {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  margin-bottom: 20px;
}

.manjulab-logo {
  font-size: 2.5rem;
}

.manjulab-brand h3 {
  margin: 0 0 4px;
  color: #a5f3fc;
  font-size: 1.25rem;
}

.manjulab-brand p {
  margin: 0;
  color: #94a3b8;
  font-size: 0.88rem;
}

.manjulab-whole-subject {
  display: flex;
  gap: 10px;
  align-items: center;
  padding: 14px;
  background: rgba(30, 41, 59, 0.6);
  border-radius: 10px;
  margin-bottom: 14px;
  cursor: pointer;
  color: #e2e8f0;
}

.manjulab-ch-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 10px;
  max-height: 200px;
  overflow-y: auto;
}

.manjulab-ch-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 12px;
  background: rgba(51, 65, 85, 0.6);
  border-radius: 999px;
  font-size: 0.78rem;
  color: #cbd5e1;
  cursor: pointer;
}

.manjulab-start {
  width: 100%;
  margin-top: 16px;
}

.manjulab-summary {
  text-align: center;
  padding: 32px;
}

.manjulab-score {
  font-size: 1.1rem;
  color: #6ee7b7;
}

/* Audio-only lecture */
.cbse-lecture-audio-only .cbse-sketch-large {
  min-height: 220px;
}

.cbse-lecture-note {
  font-size: 0.82rem;
  color: #94a3b8;
  margin: 0 0 10px;
}

.cbse-lecture-caption {
  min-height: 4.5rem;
  padding: 12px 14px;
  margin-bottom: 12px;
  background: rgba(15, 23, 42, 0.55);
  border: 1px solid rgba(148, 163, 184, 0.25);
  border-radius: 10px;
}

.cbse-caption-hint {
  margin: 0;
  font-size: 0.85rem;
  color: #94a3b8;
  font-style: italic;
}

.cbse-caption-role {
  margin: 0 0 6px;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: #38bdf8;
}

.cbse-caption-text {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.55;
  color: #e2e8f0;
}

.cbse-speaker-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  background: rgba(56, 189, 248, 0.15);
  border: 1px solid rgba(56, 189, 248, 0.35);
  border-radius: 999px;
  font-size: 0.85rem;
  color: #e0f2fe;
  margin-bottom: 10px;
  animation: cbse-pulse-speaker 1.2s ease infinite;
}

.cbse-speaker-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #38bdf8;
}

@keyframes cbse-pulse-speaker {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.65;
  }
}

.cbse-progress-bar {
  height: 6px;
  background: rgba(51, 65, 85, 0.8);
  border-radius: 3px;
  overflow: hidden;
  margin-bottom: 4px;
}

.cbse-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, #38bdf8, #818cf8);
  transition: width 0.3s;
}

.cbse-lecture-progress {
  font-size: 0.75rem;
  color: #64748b;
  margin-bottom: 12px;
}

.cbse-dialogue {
  display: none;
}