/* ============================================
   CHAPTER NAV — Shared floating scroll navigation
   Used across all interactive-story essays.
   Include via: <link rel="stylesheet" href="../lib/chapter-nav.css">
   ============================================ */

/* ---- Floating nav container ---- */
.chapter-nav {
  position: fixed;
  z-index: 200;
  display: flex;
  align-items: center;
  gap: 6px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.chapter-nav.is-visible {
  opacity: 1;
  pointer-events: auto;
}

/* ---- Pill background (::before pseudo) ---- */
.chapter-nav::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 999px;
  background: rgba(26, 24, 22, 0.55);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--border-subtle);
  opacity: 0;
  transition: opacity 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  pointer-events: none;
  z-index: -1;
}

html[data-theme="light"] .chapter-nav::before {
  background: rgba(245, 242, 238, 0.7);
}

.chapter-nav.is-horizontal::before { opacity: 1; }
.chapter-nav--pill-hidden::before { opacity: 0 !important; }

/* ---- Vertical (left sidebar) ---- */
.chapter-nav.is-vertical {
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  flex-direction: column;
}

/* ---- Horizontal (bottom bar) ---- */
.chapter-nav.is-horizontal {
  bottom: 16px;
  left: 50%;
  transform: translateX(-50%);
  flex-direction: row;
  border-radius: 999px;
  padding: 6px 12px;
}

/* ---- TOC / back button ---- */
.chapter-nav__back {
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  border: 1px solid var(--border-subtle);
  border-radius: 50%;
  background: transparent;
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s, background 0.2s;
  flex-shrink: 0;
}

.chapter-nav__back:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: rgba(200,160,100,0.06);
}

.chapter-nav__back.is-active {
  color: var(--accent);
  border-color: var(--accent);
  background: rgba(200,160,100,0.1);
}

/* ---- Divider ---- */
.chapter-nav__divider { flex-shrink: 0; }

.chapter-nav.is-vertical .chapter-nav__divider {
  width: 16px;
  height: 1px;
  background: var(--border-subtle);
  margin: 2px 0;
}

.chapter-nav.is-horizontal .chapter-nav__divider {
  width: 1px;
  height: 16px;
  background: var(--border-subtle);
  margin: 0 2px;
}

/* ---- Arrow buttons ---- */
.chapter-nav__arrow {
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  border: none;
  background: transparent;
  border-radius: 50%;
  cursor: pointer;
  transition: color 0.2s;
  flex-shrink: 0;
}

.chapter-nav__arrow:hover { color: var(--accent); }

.chapter-nav__arrow:hover svg {
  transform: scale(1.15);
  transition: transform 0.2s;
}

.chapter-nav__arrow.is-hidden {
  opacity: 0;
  pointer-events: none;
}

/* ---- Dots container ---- */
.chapter-nav__dots {
  display: flex;
  align-items: center;
  position: relative;
}

.chapter-nav.is-vertical .chapter-nav__dots {
  flex-direction: column;
  gap: 8px;
}

.chapter-nav.is-horizontal .chapter-nav__dots {
  flex-direction: row;
  gap: 8px;
}

/* ---- Spacer between groups ---- */
.chapter-nav__spacer { flex-shrink: 0; }

.chapter-nav.is-vertical .chapter-nav__spacer {
  width: 16px;
  height: 4px;
}

.chapter-nav.is-horizontal .chapter-nav__spacer {
  width: 4px;
  height: 16px;
}

/* ---- Individual dot ---- */
.chapter-nav__dot {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border: none;
  background: transparent;
  cursor: pointer;
  padding: 0;
}

.chapter-nav__circle {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--border);
  position: relative;
  transition: background 0.3s, transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1), box-shadow 0.3s;
}

.chapter-nav__dot.is-current .chapter-nav__circle {
  background: var(--accent);
  transform: scale(1.3);
  box-shadow: 0 0 8px rgba(200,160,100,0.4);
}

html[data-theme="light"] .chapter-nav__dot.is-current .chapter-nav__circle {
  box-shadow: 0 0 8px rgba(160,120,48,0.35);
}

.chapter-nav__dot:hover .chapter-nav__circle {
  background: var(--text-secondary);
  transform: scale(1.2);
}

.chapter-nav__dot.is-current:hover .chapter-nav__circle {
  background: var(--accent);
}

/* ---- Pulse ripple (TOC hover sync) ---- */
.chapter-nav__circle::after {
  content: '';
  position: absolute;
  inset: -2px;
  border-radius: 50%;
  border: 1.5px solid var(--text-secondary);
  opacity: 0;
  transform: scale(1);
  pointer-events: none;
}

.chapter-nav__dot.is-pulsing .chapter-nav__circle {
  background: var(--text-secondary);
  transform: scale(1.15);
}

.chapter-nav__dot.is-pulsing .chapter-nav__circle::after {
  animation: nav-ripple 1.2s cubic-bezier(0.16, 1, 0.3, 1) infinite;
}

@keyframes nav-ripple {
  0% { opacity: 0.5; transform: scale(1); }
  100% { opacity: 0; transform: scale(3.5); }
}

/* ---- Hover labels ---- */
.chapter-nav__label {
  position: absolute;
  white-space: nowrap;
  font-family: var(--font-mono, 'JetBrains Mono', monospace);
  font-size: 0.625rem;
  letter-spacing: 0.06em;
  color: var(--text-secondary);
  background: var(--surface);
  border: 1px solid var(--border-subtle);
  padding: 4px 8px;
  border-radius: 4px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s, transform 0.2s;
  z-index: 10;
}

.chapter-nav.is-vertical .chapter-nav__label {
  left: 36px;
  top: 50%;
  transform: translateY(-50%) translateX(-4px);
}

.chapter-nav.is-vertical .chapter-nav__dot:hover .chapter-nav__label {
  opacity: 1;
  transform: translateY(-50%) translateX(0);
}

.chapter-nav.is-horizontal .chapter-nav__label {
  bottom: 36px;
  left: 50%;
  transform: translateX(-50%) translateY(4px);
}

.chapter-nav.is-horizontal .chapter-nav__dot:hover .chapter-nav__label {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ---- Progress bar ---- */
.chapter-nav__progress {
  position: absolute;
  background: var(--accent);
  opacity: 0.25;
  border-radius: 1px;
  transition: width 0.15s linear, height 0.15s linear;
  pointer-events: none;
}

.chapter-nav.is-vertical .chapter-nav__progress {
  left: -4px;
  top: 0;
  width: 2px;
}

.chapter-nav.is-horizontal .chapter-nav__progress {
  bottom: -4px;
  left: 0;
  height: 2px;
}

/* ---- Layout toggle ---- */
.chapter-nav__toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border: none;
  border-radius: 6px;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  transition: color 0.2s;
  flex-shrink: 0;
}

.chapter-nav__toggle:hover { color: var(--text-secondary); }


/* ============================================
   TOC PANEL — Slide-out overlay
   ============================================ */
.toc-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 150;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

body.is-panel-open .toc-backdrop {
  opacity: 1;
  pointer-events: auto;
}

html[data-theme="light"] .toc-backdrop {
  background: rgba(0,0,0,0.25);
}

.toc-panel {
  position: fixed;
  z-index: 160;
  overflow-y: auto;
  background: var(--bg);
  opacity: 0;
  pointer-events: none;
  transition: transform 0.6s cubic-bezier(0.16, 1, 0.3, 1),
              opacity 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Vertical: slides from left */
body.layout-vertical .toc-panel {
  top: 0;
  left: 0;
  bottom: 0;
  width: 380px;
  max-width: 85vw;
  padding-left: 56px;
  border-right: 1px solid var(--border-subtle);
  transform: translateX(-100%);
  opacity: 0;
  pointer-events: none;
}

body.layout-vertical.is-panel-open .toc-panel {
  transform: translateX(0);
  opacity: 1;
  pointer-events: auto;
}

/* Horizontal: slides from bottom */
body.layout-horizontal .toc-panel {
  left: 0;
  right: 0;
  bottom: 0;
  height: 55vh;
  padding-bottom: 56px;
  border-top: 1px solid var(--border-subtle);
  transform: translateY(100%);
  opacity: 0;
  pointer-events: none;
}

body.layout-horizontal.is-panel-open .toc-panel {
  transform: translateY(0);
  opacity: 1;
  pointer-events: auto;
}

/* ---- Panel header ---- */
.toc-panel__header {
  position: relative;
  padding: 48px 32px 32px;
  text-align: center;
  border-bottom: 1px solid var(--border-subtle);
  overflow: hidden;
}

.toc-panel__header::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 120px;
  height: 120px;
  transform: translate(-50%, -50%) scale(0);
  border-radius: 50%;
  background: radial-gradient(circle, rgba(200, 160, 100, 0.12) 0%, rgba(200, 160, 100, 0.04) 40%, transparent 70%);
  transition: transform 0.5s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.5s;
  opacity: 0;
  pointer-events: none;
}

/* Header hover — glow orb + title highlight */
.toc-panel__header:hover::after {
  transform: translate(-50%, -50%) scale(2);
  opacity: 1;
}

.toc-panel__header:hover .toc-panel__title {
  color: var(--text-primary);
}

.toc-panel__header:hover .toc-panel__title em {
  text-shadow: 0 0 24px rgba(200, 160, 100, 0.3);
}

html[data-theme="light"] .toc-panel__header:hover .toc-panel__title em {
  text-shadow: 0 0 24px rgba(160, 120, 48, 0.2);
}

.toc-panel__header:hover .toc-panel__subtitle {
  color: var(--text-secondary);
}

.toc-panel__eyebrow {
  display: block;
  font-family: var(--font-mono, 'JetBrains Mono', monospace);
  font-size: 0.625rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.toc-panel__title {
  font-family: var(--font-display, 'Playfair Display', Georgia, serif);
  font-size: 1.5rem;
  font-weight: 400;
  color: var(--text-primary);
  line-height: 1.2;
  transition: color 0.3s;
}

.toc-panel__title em {
  color: var(--accent);
  font-style: italic;
}

.toc-panel__subtitle {
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* ---- Panel body ---- */
.toc-panel__body {
  padding: 24px 32px;
}

/* ---- TOC groups ---- */
.toc-group {
  margin-bottom: 24px;
}

.toc-group__label {
  display: block;
  font-family: var(--font-mono, 'JetBrains Mono', monospace);
  font-size: 0.625rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 8px;
  padding-left: 4px;
}

/* ---- TOC items ---- */
.toc-item {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  padding: 8px;
  border: none;
  background: transparent;
  border-radius: 6px;
  cursor: pointer;
  text-align: left;
  transition: background 0.2s, transform 0.15s;
  font-family: var(--font-body, 'Inter', sans-serif);
}

.toc-item:hover {
  background: var(--surface-hover);
  transform: translateX(2px);
}

.toc-item.is-current {
  background: var(--surface);
}

.toc-item__num {
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono, 'JetBrains Mono', monospace);
  font-size: 0.6875rem;
  color: var(--text-muted);
  background: var(--surface);
  border-radius: 50%;
  flex-shrink: 0;
  transition: background 0.2s, color 0.2s;
}

.toc-item.is-current .toc-item__num {
  background: var(--accent);
  color: var(--bg);
}

.toc-item__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--border);
  flex-shrink: 0;
  margin: 0 8px;
  transition: background 0.2s;
}

.toc-item.is-current .toc-item__dot {
  background: var(--accent);
}

.toc-item__label {
  font-size: 0.875rem;
  color: var(--text-secondary);
  transition: color 0.2s;
}

.toc-item:hover .toc-item__label {
  color: var(--text-primary);
}

.toc-item.is-current .toc-item__label {
  color: var(--text-primary);
  font-weight: 500;
}

.toc-item__desc {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-left: auto;
  font-style: italic;
}


/* ============================================
   CHAPTER NAV — Responsive
   ============================================ */
@media (max-width: 900px) {
  .chapter-nav.is-vertical { left: 8px; }
  .chapter-nav.is-horizontal { bottom: 8px; }
  .chapter-nav__label { display: none; }

  body.layout-vertical .toc-panel {
    width: 85vw;
  }
}