/* ── DARK MODE ─────────────────────────────────────────────── */
[data-theme="dark"] {
  --bg: #111827;
  --white: #1e2533;
  --text-primary: #e2e8f0;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --border: rgba(255,255,255,0.08);
  --teal-light: #0a2a20;
  --slate: #0d1117;
  --slate-mid: #161b22;
}

[data-theme="dark"] nav {
  background: rgba(17,24,39,0.92) !important;
}

/* ── DARK MODE TOGGLE ──────────────────────────────────────── */
.theme-toggle-btn,
.theme-toggle-fixed {
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  display: flex;
  align-items: center;
}

/* Fixed position variant used on index.html (no nav bar) */
.theme-toggle-fixed {
  position: fixed;
  top: 1.1rem;
  right: 1.25rem;
  z-index: 200;
}

/* The pill track — wide enough for thumb + two icons */
.toggle-track {
  width: 48px;
  height: 24px;
  border-radius: 12px;
  background: rgba(0,0,0,0.07);
  border: 1.5px solid rgba(0,0,0,0.13);
  display: block;
  position: relative;
  transition: background 0.25s, border-color 0.25s;
  flex-shrink: 0;
}

[data-theme="dark"] .toggle-track {
  background: var(--teal, #1D9E75);
  border-color: var(--teal-dark, #0F6E56);
}

/* Moon icon — left side, visible in dark mode */
.toggle-track::before {
  content: '☾';
  position: absolute;
  left: 5px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 14px;
  line-height: 1;
  pointer-events: none;
  color: rgba(0,0,0,0.2);
  transition: color 0.25s;
}

[data-theme="dark"] .toggle-track::before {
  color: rgba(255,255,255,0.9);
}

/* Sun icon — right side, visible in light mode */
.toggle-track::after {
  content: '☀';
  position: absolute;
  right: 5px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 14px;
  line-height: 1;
  pointer-events: none;
  color: rgba(0,0,0,0.38);
  transition: color 0.25s;
}

[data-theme="dark"] .toggle-track::after {
  color: rgba(255,255,255,0.35);
}

/* The sliding circle */
.toggle-thumb {
  position: absolute;
  top: 3px;
  left: 3px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 1px 3px rgba(0,0,0,0.2);
  transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  z-index: 1;
}

[data-theme="dark"] .toggle-thumb {
  transform: translateX(22px);
}

/* ── MOBILE NAV ───────────────────────────────────────────── */
.nav-brand-burger { display: none; }

@media (max-width: 600px) {
  .nav-chapter { display: none; }
  .nav-links li:not(.nav-toggle-item) { display: none; }
  .nav-brand-text { display: none; }
  .nav-dropdown .nav-brand-chevron { display: none !important; }
  .nav-brand-burger {
    display: flex;
    align-items: center;
    color: var(--text-primary, #1a1f2e);
    opacity: 0.75;
  }
  .nav-dropdown.open .nav-brand-burger { opacity: 1; }
}

/* ── CHAPTER DROPDOWN ─────────────────────────────────────── */
.nav-dropdown { position: relative; }

.nav-dropdown-trigger {
  background: none;
  border: none;
  cursor: pointer;
  font-size: 13px;
  color: var(--text-secondary, #5a6278);
  font-family: 'DM Sans', sans-serif;
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 0;
  transition: color 0.2s;
}
.nav-dropdown-trigger:hover { color: var(--teal, #1D9E75); }

.nav-dropdown-trigger svg {
  transition: transform 0.2s;
  flex-shrink: 0;
}
.nav-dropdown.open .nav-dropdown-trigger { color: var(--teal, #1D9E75); }
.nav-dropdown.open .nav-dropdown-trigger svg { transform: rotate(180deg); }

/* Chevron appended to the nav-brand link (desktop only) */
.nav-brand-chevron {
  display: inline-flex;
  align-items: center;
  margin-left: 5px;
  opacity: 0.45;
  vertical-align: middle;
  transition: opacity 0.2s, transform 0.2s;
}
.nav-brand-chevron svg { transition: transform 0.2s; }
.nav-dropdown.open .nav-brand-chevron { opacity: 1; }
.nav-dropdown.open .nav-brand-chevron svg { transform: rotate(180deg); }

.nav-dropdown-menu {
  display: none;
  position: absolute;
  top: calc(100% + 16px);
  left: 0;
  background: var(--white, #fff);
  border: 1px solid var(--border, rgba(0,0,0,0.08));
  border-radius: 12px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.1);
  list-style: none;
  min-width: 248px;
  padding: 6px;
  z-index: 500;
}
.nav-dropdown.open .nav-dropdown-menu { display: block; }

.nav-dropdown-menu li a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 7px 10px;
  border-radius: 8px;
  text-decoration: none;
  color: var(--text-secondary, #5a6278);
  font-size: 13px;
  transition: background 0.15s, color 0.15s;
  white-space: nowrap;
}
.nav-dropdown-menu li a:hover {
  background: var(--teal-light, #E1F5EE);
  color: var(--teal-dark, #0F6E56);
}
.nav-dropdown-menu li a.nav-current {
  color: var(--teal, #1D9E75);
  font-weight: 500;
}

.nav-dropdown-num {
  width: 20px;
  height: 20px;
  border-radius: 5px;
  background: var(--bg, #f8f7f4);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  font-weight: 500;
  color: var(--text-muted, #9aa0b4);
  flex-shrink: 0;
}
.nav-dropdown-menu li a:hover .nav-dropdown-num,
.nav-dropdown-menu li a.nav-current .nav-dropdown-num {
  background: var(--teal-light, #E1F5EE);
  color: var(--teal-dark, #0F6E56);
}

.nav-dropdown-divider {
  height: 1px;
  background: var(--border, rgba(0,0,0,0.08));
  margin: 4px 6px;
}

/* ── READING PROGRESS BAR ──────────────────────────────────── */
#reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0%;
  background: var(--teal, #1D9E75);
  z-index: 300;
  transition: width 0.08s linear;
  pointer-events: none;
}

/* ── SHARE STRIP (injected on chapter pages) ───────────────── */
.share-strip {
  text-align: center;
  padding: 2rem 1.5rem 1rem;
}

.share-label {
  font-size: 14px;
  color: var(--text-muted, #9aa0b4);
  margin-bottom: 1rem;
}

.share-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.share-primary {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--teal, #1D9E75);
  color: #fff;
  border: none;
  border-radius: 100px;
  padding: 9px 20px;
  font-size: 13px;
  font-weight: 500;
  font-family: 'DM Sans', sans-serif;
  cursor: pointer;
  transition: background 0.2s;
}
.share-primary:hover { background: var(--teal-dark, #0F6E56); }

.share-divider {
  width: 1px;
  height: 22px;
  background: var(--border, rgba(0,0,0,0.08));
}

.share-icons { display: flex; align-items: center; gap: 0.5rem; }

.share-icon-btn {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  border: 1px solid var(--border, rgba(0,0,0,0.08));
  background: var(--white, #fff);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary, #5a6278);
  text-decoration: none;
  transition: border-color 0.2s, color 0.2s;
}
.share-icon-btn:hover { border-color: var(--teal, #1D9E75); color: var(--teal, #1D9E75); }

/* ── CHAPTER READ INDICATOR (index.html) ───────────────────── */
.chapter-num { position: relative; }

.chapter-item.chapter-read .chapter-num::after {
  content: '✓';
  position: absolute;
  bottom: -5px;
  right: -5px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--teal, #1D9E75);
  color: #fff;
  font-size: 8px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid var(--white, #fff);
  line-height: 1;
}