@import url('https://fonts.googleapis.com/css2?family=Cormorant+Garamond:wght@500;600;700&family=IBM+Plex+Sans:wght@400;500;600&family=Noto+Serif+Bengali:wght@400;500;600&display=swap');

:root {
  color-scheme: dark;
  --bg: #07131c;
  --bg-deep: #03090e;
  --panel: rgba(8, 20, 31, 0.78);
  --panel-strong: rgba(11, 27, 42, 0.92);
  --border: rgba(182, 148, 85, 0.24);
  --gold: #dcbf7c;
  --text: #f4eee2;
  --muted: #b9b2a7;
  --button: rgba(255, 255, 255, 0.03);
  --button-strong: rgba(220, 191, 124, 0.12);
  --shadow: 0 30px 80px rgba(0, 0, 0, 0.42);
}

html[data-theme='light'] {
  color-scheme: light;
  --bg: #efe3cc;
  --bg-deep: #f8f2e7;
  --panel: rgba(255, 249, 241, 0.88);
  --panel-strong: rgba(255, 252, 246, 0.96);
  --border: rgba(139, 103, 45, 0.18);
  --gold: #875f24;
  --text: #23170b;
  --muted: #66584b;
  --button: rgba(95, 71, 32, 0.05);
  --button-strong: rgba(135, 95, 36, 0.14);
  --shadow: 0 22px 60px rgba(76, 55, 24, 0.12);
}

* {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
}

body {
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(129, 88, 36, 0.28), transparent 28%),
    radial-gradient(circle at top right, rgba(71, 132, 150, 0.2), transparent 32%),
    linear-gradient(180deg, #10212f 0%, var(--bg) 35%, var(--bg-deep) 100%);
  font-family: 'IBM Plex Sans', sans-serif;
  transition: background 200ms ease, color 200ms ease;
}

html[data-theme='light'] body {
  background:
    radial-gradient(circle at top left, rgba(175, 126, 52, 0.18), transparent 30%),
    radial-gradient(circle at top right, rgba(127, 171, 165, 0.18), transparent 32%),
    linear-gradient(180deg, #fbf6ee 0%, var(--bg-deep) 100%);
}

.backdrop {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(120deg, rgba(255, 255, 255, 0.02), transparent 25%),
    radial-gradient(circle at 20% 20%, rgba(220, 191, 124, 0.08), transparent 20%),
    radial-gradient(circle at 80% 10%, rgba(143, 209, 193, 0.06), transparent 16%);
}

.shell {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 360px minmax(0, 1fr);
  gap: 24px;
  padding: 24px;
}

.sidebar,
.main-view {
  min-width: 0;
}

.panel,
.reader-card {
  border: 1px solid var(--border);
  background: var(--panel);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.sidebar {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.brand-block {
  padding: 18px 18px 4px;
}

.eyebrow,
.reader-label,
.stat-label,
.control-label {
  margin: 0;
  color: var(--gold);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.brand-block h1,
.hero h2,
.reader-card h3,
.appendix-body h1,
.appendix-body h2,
.appendix-body h3 {
  font-family: 'Cormorant Garamond', serif;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.brand-block h1 {
  margin: 10px 0 8px;
  font-size: clamp(2rem, 4vw, 3rem);
  line-height: 0.95;
}

.lede,
.hero-copy,
.chapter-date,
.appendix-body p,
.appendix-body li,
.footer-nav-text {
  color: var(--muted);
  line-height: 1.7;
}

.stats-panel,
.controls-panel,
.list-panel,
.hero,
.appendix-view,
.chapter-footer-nav {
  padding: 18px;
  border-radius: 22px;
}

.stats-panel {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.stat {
  padding: 14px;
  border-radius: 16px;
  background: linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0.01));
  border: 1px solid rgba(255,255,255,0.06);
}

html[data-theme='light'] .stat {
  border-color: rgba(95, 71, 32, 0.08);
  background: linear-gradient(180deg, rgba(255,255,255,0.55), rgba(255,255,255,0.32));
}

.stat strong {
  display: block;
  margin-top: 8px;
  font-size: 1.1rem;
}

.controls-panel {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.segmented {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}

.segmented-two {
  grid-template-columns: repeat(2, 1fr);
}

.mode-button,
.theme-button,
.nav-button,
.utility-button,
.chapter-link,
.appendix-link {
  border: 1px solid transparent;
  color: var(--text);
  background: var(--button);
  cursor: pointer;
  transition: 180ms ease;
}

.mode-button,
.theme-button,
.nav-button,
.utility-button {
  padding: 12px 14px;
  border-radius: 999px;
  font-weight: 600;
}

.utility-buttons {
  display: flex;
  gap: 10px;
}

.utility-button {
  background: transparent;
  border-color: var(--border);
}

.compact-button {
  min-width: 0;
}

.mode-button:hover,
.mode-button.active,
.theme-button:hover,
.theme-button.active,
.nav-button:hover,
.utility-button:hover,
.chapter-link:hover,
.chapter-link.active,
.appendix-link:hover,
.appendix-link.active {
  border-color: rgba(220, 191, 124, 0.44);
  background: var(--button-strong);
}

.mode-button:disabled,
.theme-button:disabled,
.nav-button:disabled,
.utility-button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.panel-heading h2 {
  margin: 0 0 12px;
  font-size: 1rem;
}

.chapter-list,
.appendix-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.chapter-link,
.appendix-link {
  display: block;
  width: 100%;
  padding: 12px 14px;
  border-radius: 14px;
  text-align: left;
  text-decoration: none;
}

.chapter-link small,
.appendix-link small {
  display: block;
  margin-top: 4px;
  color: var(--muted);
}

.main-view {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.hero {
  position: relative;
  top: auto;
  z-index: 1;
  background: var(--panel-strong);
}

.hero h2 {
  margin: 8px 0 6px;
  font-size: clamp(2rem, 4vw, 3.25rem);
  line-height: 0.95;
}

.hero-actions {
  display: flex;
  gap: 12px;
  margin-top: 16px;
  flex-wrap: wrap;
}

.chapter-view {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.chapter-view.english-mode {
  grid-template-columns: 1fr;
}

.chapter-view.english-mode .bangla-card,
.chapter-view.bangla-mode .english-card {
  display: none;
}

.chapter-view.bangla-mode {
  grid-template-columns: 1fr;
}

.reader-card {
  border-radius: 24px;
  padding: 22px;
}

.reader-card h3 {
  margin: 10px 0 8px;
  font-size: clamp(1.7rem, 3vw, 2.4rem);
}

.chapter-body {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.chapter-body p {
  margin: 0;
  line-height: 1.9;
  font-size: 1.02rem;
}

.bangla-card,
#chapter-body-bn,
#chapter-title-bn,
#chapter-date-bn,
.appendix-body {
  font-family: 'Noto Serif Bengali', serif;
}

.appendix-body {
  line-height: 1.85;
}

.appendix-body ul,
.appendix-body ol {
  padding-left: 1.3rem;
}

.chapter-footer-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.footer-nav-copy {
  min-width: 0;
}

.footer-nav-text {
  margin: 6px 0 0;
}

.footer-nav-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.hidden {
  display: none;
}

body.reader-fullscreen {
  overflow: auto;
}

body.reader-fullscreen .shell {
  grid-template-columns: 1fr;
  gap: 16px;
  padding: 16px;
}

body.reader-fullscreen .sidebar {
  display: none;
}

body.reader-fullscreen .hero,
body.reader-fullscreen .reader-card,
body.reader-fullscreen .appendix-view,
body.reader-fullscreen .chapter-footer-nav {
  border-radius: 20px;
}

@media (max-width: 1100px) {
  .shell {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 760px) {
  .shell {
    padding: 14px;
    gap: 14px;
  }

  .stats-panel {
    grid-template-columns: 1fr 1fr;
  }

  .chapter-view,
  .chapter-view.split-mode {
    grid-template-columns: 1fr;
  }

  .chapter-footer-nav {
    flex-direction: column;
    align-items: stretch;
  }

  .footer-nav-actions,
  .utility-buttons {
    width: 100%;
  }

  .footer-nav-actions .nav-button,
  .utility-buttons .utility-button {
    flex: 1;
  }
}