/* ============================================================
   THE FREQUENCY BELOW — Story Roadmap
   Style Sheet
   ============================================================ */

/* ── ROOT & TOKENS ─────────────────────────────────────────── */
:root {
  --bg:       #07070f;
  --bg-2:     #0d0d1a;
  --bg-3:     #121222;
  --bg-4:     #18182a;

  --text:     #e4e0da;
  --text-dim: #8a8696;
  --text-muted: #4a475c;

  --border:       rgba(255, 255, 255, 0.06);
  --border-hover: rgba(255, 255, 255, 0.13);

  /* Part 1 — Cool slate-blue (the hearing world's constraint) */
  --p1:        hsl(215, 50%, 58%);
  --p1-mid:    hsl(215, 45%, 35%);
  --p1-dim:    hsla(215, 50%, 58%, 0.10);
  --p1-border: hsla(215, 50%, 58%, 0.28);
  --p1-glow:   hsla(215, 70%, 55%, 0.13);

  /* Part 2 — Soft violet (the in-between, awakening) */
  --p2:        hsl(265, 60%, 68%);
  --p2-mid:    hsl(265, 45%, 38%);
  --p2-dim:    hsla(265, 60%, 68%, 0.10);
  --p2-border: hsla(265, 60%, 68%, 0.28);
  --p2-glow:   hsla(265, 75%, 62%, 0.13);

  /* Part 3 — Wheat gold (arrival, peace) */
  --p3:        hsl(42, 75%, 58%);
  --p3-mid:    hsl(42, 55%, 32%);
  --p3-dim:    hsla(42, 75%, 58%, 0.10);
  --p3-border: hsla(42, 75%, 58%, 0.30);
  --p3-glow:   hsla(42, 88%, 52%, 0.15);

  --font-display: 'Playfair Display', Georgia, serif;
  --font-body:    'Inter', system-ui, sans-serif;
  --font-mono:    'Space Mono', 'Courier New', monospace;

  --radius:    12px;
  --radius-sm: 8px;
  --ease:      cubic-bezier(0.4, 0, 0.2, 1);
  --transition: 0.28s var(--ease);
}

/* ── RESET ──────────────────────────────────────────────────── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.65;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* ── CONTAINER ──────────────────────────────────────────────── */
.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 2rem;
}

/* ── SECTION LABEL ──────────────────────────────────────────── */
.section-label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 2.75rem;
  display: flex;
  align-items: center;
  gap: 1.25rem;
}
.section-label::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}

/* ════════════════════════════════════════════════════════════
   HERO
   ════════════════════════════════════════════════════════════ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  border-bottom: 1px solid var(--border);
}

.hero__canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.hero__content {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 2rem;
  max-width: 820px;
}

.hero__eyebrow {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 1.75rem;
}

.hero__title {
  font-family: var(--font-display);
  font-size: clamp(2.15rem, 9vw, 7rem);
  font-weight: 700;
  line-height: 1.04;
  letter-spacing: -0.025em;
  color: var(--text);
  margin-bottom: 1.75rem;
}
.hero__title em {
  font-style: italic;
  color: var(--p3);
}

.hero__tagline {
  font-size: 1.05rem;
  color: var(--text-dim);
  font-weight: 300;
  line-height: 1.75;
  max-width: 580px;
  margin: 0 auto 2.75rem;
}

.hero__meta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}
.hero__meta-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.3rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-dim);
}
.hero__meta-label {
  font-size: 0.58rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-muted);
}
.hero__meta-divider {
  width: 1px;
  height: 2rem;
  background: var(--border);
  flex-shrink: 0;
}

.hero__scroll-hint {
  position: absolute;
  bottom: 2.5rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.8rem;
  z-index: 2;
}
.hero__scroll-hint span {
  font-family: var(--font-mono);
  font-size: 0.58rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--text-muted);
}
.hero__scroll-line {
  width: 1px;
  height: 52px;
  background: linear-gradient(to bottom, var(--text-muted), transparent);
  animation: scrollPulse 2.2s ease-in-out infinite;
  transform-origin: top;
}
@keyframes scrollPulse {
  0%, 100% { opacity: 0.25; transform: scaleY(0.9); }
  50%       { opacity: 0.9;  transform: scaleY(1.1); }
}

/* ════════════════════════════════════════════════════════════
   THEMES SECTION
   ════════════════════════════════════════════════════════════ */
.themes-section {
  padding: 6rem 0;
  border-bottom: 1px solid var(--border);
}

.themes-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 1.25rem;
}

.theme-card {
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem 1.75rem;
  transition: border-color var(--transition), transform var(--transition);
}
.theme-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-3px);
}
.theme-icon {
  font-size: 1.25rem;
  color: var(--p3);
  opacity: 0.65;
  margin-bottom: 1rem;
  display: block;
}
.theme-card h3 {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.65rem;
  line-height: 1.3;
}
.theme-card p {
  font-size: 0.865rem;
  color: var(--text-dim);
  line-height: 1.68;
}

/* ════════════════════════════════════════════════════════════
   CHARACTERS SECTION
   ════════════════════════════════════════════════════════════ */
.characters-section {
  padding: 6rem 0;
  border-bottom: 1px solid var(--border);
}

.characters-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.25rem;
}

.character-card {
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
  display: flex;
  flex-direction: column;
}
.character-card:hover { transform: translateY(-4px); }

.character-card__bar {
  height: 3px;
  flex-shrink: 0;
}
.character--protagonist .character-card__bar    { background: var(--p2); }
.character--protagonist:hover { border-color: var(--p2-border); box-shadow: 0 10px 48px var(--p2-glow); }

.character--elder .character-card__bar          { background: var(--p1); }
.character--elder:hover       { border-color: var(--p1-border); box-shadow: 0 10px 48px var(--p1-glow); }

.character--musician .character-card__bar       { background: var(--p3); }
.character--musician:hover    { border-color: var(--p3-border); box-shadow: 0 10px 48px var(--p3-glow); }

.character--family .character-card__bar         { background: linear-gradient(to right, var(--p1), var(--p2)); }
.character--family:hover      { border-color: var(--border-hover); }

.character-card__inner {
  padding: 1.75rem;
  flex: 1;
  display: flex;
  flex-direction: column;
}
.character-card__role {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.4rem;
}
.character-card__name {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 1rem;
  line-height: 1.2;
}
.working-name {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.58rem;
  font-weight: 400;
  font-style: normal;
  color: var(--text-muted);
  letter-spacing: 0.05em;
  margin-left: 0.25rem;
}
.character-card__bio {
  font-size: 0.87rem;
  color: var(--text-dim);
  line-height: 1.68;
  flex: 1;
  margin-bottom: 1.25rem;
}
.character-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}
.tag {
  font-family: var(--font-mono);
  font-size: 0.58rem;
  letter-spacing: 0.07em;
  padding: 0.28rem 0.6rem;
  border-radius: 4px;
  background: var(--bg-3);
  border: 1px solid var(--border);
  color: var(--text-dim);
}

/* ════════════════════════════════════════════════════════════
   ARC SECTION
   ════════════════════════════════════════════════════════════ */
.arc-section {
  padding: 5rem 0;
  border-bottom: 1px solid var(--border);
}
.arc-wrap { position: relative; }
.arc-canvas {
  width: 100%;
  height: 140px;
  display: block;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--bg-2);
}
.arc-labels {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin-top: 0.75rem;
  text-align: center;
}
.arc-label {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  line-height: 1.6;
}
.arc-label--1 { color: var(--p1); text-align: left; }
.arc-label--2 { color: var(--p2); }
.arc-label--3 { color: var(--p3); text-align: right; }

/* ════════════════════════════════════════════════════════════
   PART HEADERS
   ════════════════════════════════════════════════════════════ */
.part { padding-bottom: 6rem; }

.part__header {
  padding: 5rem 0 3.5rem;
  margin-bottom: 3rem;
  border-bottom: 1px solid var(--border);
  position: relative;
}
.part--1 .part__header { background: linear-gradient(to bottom, var(--p1-dim) 0%, transparent 100%); }
.part--2 .part__header { background: linear-gradient(to bottom, var(--p2-dim) 0%, transparent 100%); }
.part--3 .part__header { background: linear-gradient(to bottom, var(--p3-dim) 0%, transparent 100%); }

.part__number {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  margin-bottom: 0.7rem;
}
.part--1 .part__number { color: var(--p1); }
.part--2 .part__number { color: var(--p2); }
.part--3 .part__number { color: var(--p3); }

.part__title {
  font-family: var(--font-display);
  font-size: clamp(2.25rem, 6vw, 4.25rem);
  font-weight: 700;
  letter-spacing: -0.025em;
  line-height: 1.08;
  margin-bottom: 0.5rem;
}
.part__subtitle {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-muted);
  letter-spacing: 0.12em;
  margin-bottom: 1.1rem;
}
.part__description {
  font-size: 1rem;
  color: var(--text-dim);
  max-width: 600px;
  line-height: 1.72;
}

/* ════════════════════════════════════════════════════════════
   CHAPTERS GRID
   ════════════════════════════════════════════════════════════ */
.chapters-grid {
  display: grid;
  gap: 1rem;
}

/* ════════════════════════════════════════════════════════════
   CHAPTER CARD
   ════════════════════════════════════════════════════════════ */
.chapter-card {
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition:
    border-color var(--transition),
    box-shadow var(--transition);
}
.chapter-card:hover {
  border-color: var(--border-hover);
}
.part--1 .chapter-card.is-open { border-color: var(--p1-border); box-shadow: 0 8px 48px var(--p1-glow); }
.part--2 .chapter-card.is-open { border-color: var(--p2-border); box-shadow: 0 8px 48px var(--p2-glow); }
.part--3 .chapter-card.is-open { border-color: var(--p3-border); box-shadow: 0 8px 48px var(--p3-glow); }

/* ── CARD HEADER ─────────────────────────────────────────── */
.chapter-card__header {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding: 1.4rem 1.75rem;
  cursor: pointer;
  user-select: none;
  transition: background var(--transition);
}
.chapter-card__header:hover {
  background: rgba(255, 255, 255, 0.02);
}
.chapter-card__header:focus-visible {
  outline: 2px solid var(--p2);
  outline-offset: -2px;
}

.chapter-number {
  font-family: var(--font-mono);
  font-size: 1.6rem;
  font-weight: 400;
  color: var(--text-muted);
  min-width: 2.6rem;
  flex-shrink: 0;
  line-height: 1;
  transition: color var(--transition);
}
.part--1 .chapter-card.is-open .chapter-number { color: var(--p1); }
.part--2 .chapter-card.is-open .chapter-number { color: var(--p2); }
.part--3 .chapter-card.is-open .chapter-number { color: var(--p3); }
.chapter-card--final .chapter-number { color: var(--p3); }

.chapter-card__title-block { flex: 1; min-width: 0; }

.chapter-title {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-dim);
  line-height: 1.3;
  margin-bottom: 0.2rem;
  transition: color var(--transition);
}
.chapter-card:hover .chapter-title,
.chapter-card.is-open .chapter-title {
  color: var(--text);
}
.chapter-card--final .chapter-title { color: var(--p3); }

.chapter-motif {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.12em;
  color: var(--text-muted);
  display: block;
}

.chapter-expand {
  flex-shrink: 0;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-muted);
  font-size: 1.1rem;
  line-height: 1;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition:
    border-color var(--transition),
    color var(--transition),
    transform var(--transition),
    background var(--transition);
  padding: 0;
}
.chapter-expand:hover {
  border-color: var(--border-hover);
  color: var(--text);
  background: rgba(255,255,255,0.04);
}
.chapter-card.is-open .chapter-expand {
  transform: rotate(45deg);
  border-color: var(--border-hover);
  color: var(--text);
}

/* ── SYNOPSIS ────────────────────────────────────────────── */
.chapter-synopsis {
  font-size: 0.9rem;
  color: var(--text-dim);
  line-height: 1.72;
  padding: 1.25rem 1.75rem 1.5rem;
  border-top: 1px solid var(--border);
}

/* ── DETAIL (expanded) ───────────────────────────────────── */
.chapter-detail {
  padding: 1.5rem 1.75rem 1.75rem;
  border-top: 1px solid var(--border);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  animation: detailIn 0.22s var(--ease) both;
}
.chapter-detail[hidden] { display: none; }

@keyframes detailIn {
  from { opacity: 0; transform: translateY(-6px); }
  to   { opacity: 1; transform: translateY(0); }
}

.chapter-beats h4,
.chapter-purpose h4 {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.9rem;
}

.chapter-beats ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}
.chapter-beats ul li {
  font-size: 0.865rem;
  color: var(--text-dim);
  line-height: 1.58;
  padding-left: 1.1rem;
  position: relative;
}
.chapter-beats ul li::before {
  content: '—';
  position: absolute;
  left: 0;
  color: var(--text-muted);
}

.chapter-purpose {
  border-left: 1px solid var(--border);
  padding-left: 2rem;
}
.chapter-purpose p {
  font-size: 0.87rem;
  color: var(--text-dim);
  line-height: 1.7;
  font-style: italic;
}

/* ── READ BUTTON ─────────────────────────────────────────── */
.chapter-read-wrapper {
  margin-top: 1.5rem;
}
.read-chapter-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-dim);
  text-decoration: none;
  padding: 0.6rem 1.15rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: transparent;
  transition: color var(--transition), border-color var(--transition), background var(--transition), box-shadow var(--transition);
}
.part--1 .read-chapter-btn:hover {
  color: var(--p1);
  border-color: var(--p1-border);
  background: var(--p1-dim);
}
.part--2 .read-chapter-btn:hover {
  color: var(--p2);
  border-color: var(--p2-border);
  background: var(--p2-dim);
}
.part--3 .read-chapter-btn:hover {
  color: var(--p3);
  border-color: var(--p3-border);
  background: var(--p3-dim);
}

/* ── FINAL CHAPTER ───────────────────────────────────────── */
.chapter-card--final {
  background: var(--bg-3);
  border-color: var(--p3-border);
  box-shadow: 0 0 72px var(--p3-glow);
}
.chapter-card--final .chapter-synopsis {
  color: var(--text-dim);
}

/* ════════════════════════════════════════════════════════════
   PART ACCENT LINES
   ════════════════════════════════════════════════════════════ */
.part--1 .chapter-card.is-open .chapter-purpose { border-left-color: var(--p1-border); }
.part--2 .chapter-card.is-open .chapter-purpose { border-left-color: var(--p2-border); }
.part--3 .chapter-card.is-open .chapter-purpose { border-left-color: var(--p3-border); }

/* ════════════════════════════════════════════════════════════
   FADE-IN SCROLL ANIMATION
   ════════════════════════════════════════════════════════════ */
.fade-up {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.55s var(--ease), transform 0.55s var(--ease);
}
.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ════════════════════════════════════════════════════════════
   FOOTER
   ════════════════════════════════════════════════════════════ */
.site-footer {
  padding: 4.5rem 0;
  border-top: 1px solid var(--border);
  text-align: center;
}
.footer-title {
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-style: italic;
  color: var(--text-dim);
  margin-bottom: 0.5rem;
}
.footer-sub {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--text-muted);
}

/* ════════════════════════════════════════════════════════════
   RESPONSIVE
   ════════════════════════════════════════════════════════════ */
@media (max-width: 900px) {
  .chapter-detail {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  .chapter-purpose {
    border-left: none;
    border-top: 1px solid var(--border);
    padding-left: 0;
    padding-top: 1.5rem;
  }
}

@media (max-width: 640px) {
  .container { padding: 0 1.25rem; }
  
  /* Sections & Spacing */
  .themes-section,
  .characters-section { padding: 3.5rem 0; }
  .arc-section { padding: 3rem 0; }
  .part { padding-bottom: 3.5rem; }
  .part__header { padding: 3rem 0 2rem; margin-bottom: 2rem; }
  .site-footer { padding: 3rem 0; }

  /* Hero */
  .hero__title { margin-bottom: 1.25rem; }
  .hero__tagline { font-size: 0.95rem; line-height: 1.6; margin-bottom: 2rem; }
  .hero__meta { flex-direction: column; gap: 0.9rem; }
  .hero__meta-divider { display: none; }
  .hero__meta-item { gap: 0.15rem; }

  /* Cards Padding */
  .theme-card {
    display: grid;
    grid-template-columns: auto 1fr;
    column-gap: 0.75rem;
    row-gap: 0.5rem;
    padding: 1.5rem 1.25rem;
  }
  .theme-icon {
    grid-column: 1;
    grid-row: 1;
    margin-bottom: 0;
    align-self: center;
    font-size: 1.1rem;
  }
  .theme-card h3 {
    grid-column: 2;
    grid-row: 1;
    margin-bottom: 0;
    align-self: center;
    font-size: 1.1rem;
  }
  .theme-card p {
    grid-column: 1 / span 2;
    grid-row: 2;
  }
  .character-card__inner { padding: 1.5rem 1.25rem; }
  .chapter-card__header { gap: 1rem; padding: 1.1rem 1.25rem; }
  .chapter-synopsis,
  .chapter-detail { padding: 1.25rem; }

  /* Chapter Card Header elements */
  .chapter-number { font-size: 1.35rem; min-width: 2.2rem; }
  .chapter-title { font-size: 1.05rem; }
  .chapter-motif { font-size: 0.55rem; letter-spacing: 0.08em; margin-top: 0.2rem; }
  .chapter-expand { width: 34px; height: 34px; font-size: 1.2rem; }

  /* Read Button Touch Target */
  .chapter-read-wrapper { margin-top: 1.25rem; }
  .read-chapter-btn { display: flex; justify-content: center; width: 100%; padding: 0.75rem 1.25rem; font-size: 0.75rem; text-align: center; }

  /* Arc labels */
  .arc-label { font-size: 0.55rem; letter-spacing: 0.05em; }
  .arc-label--1 { text-align: center; }
  .arc-label--3 { text-align: center; }
}