@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:wght@700;900&family=Inter:wght@400;600&family=JetBrains+Mono:wght@400&display=swap');

:root {
  --bg-deep: #08090d;
  --bg: #0d1017;
  --bg-card: #13161e;
  --bg-card-hover: #191d28;
  --bg-surface: #1a1e2a;
  --text: #e8e6e3;
  --text-secondary: #8b8f9a;
  --text-muted: #5c6070;
  --gold: #c9a84c;
  --gold-light: #dfc06a;
  --gold-dim: #a08535;
  --border: rgba(255,255,255,0.06);
  --border-hover: rgba(201,168,76,0.3);
  --content-width: 820px;
  --wide-width: 1100px;
  --glow: 0 0 40px rgba(201,168,76,0.08);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 17px;
  line-height: 1.8;
  color: var(--text);
  background: var(--bg-deep);
  -webkit-font-smoothing: antialiased;
}

::selection {
  background: rgba(201,168,76,0.3);
  color: white;
}

/* ===== LAYOUT ===== */
.site-header {
  background: rgba(13,16,23,0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  padding: 0.9rem 2rem;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  max-width: var(--wide-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-logo {
  font-family: 'Playfair Display', serif;
  font-size: 1.3rem;
  font-weight: 900;
  color: var(--gold);
  text-decoration: none;
  letter-spacing: 0.12em;
}

.site-logo:hover { color: var(--gold-light); }

.header-nav a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 500;
  margin-left: 2rem;
  transition: color 0.2s;
  letter-spacing: 0.02em;
}

.header-nav a:hover { color: var(--gold); }

.site-footer {
  background: var(--bg);
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  text-align: center;
  padding: 2.5rem 2rem;
  font-size: 0.8rem;
  letter-spacing: 0.03em;
}

/* ===== HOME — HERO ===== */
.hero {
  background: var(--bg);
  padding: 6rem 2rem 3rem;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -200px;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(201,168,76,0.06) 0%, transparent 70%);
  pointer-events: none;
}

.hero-inner {
  max-width: var(--wide-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 4rem;
}

.hero-text {
  flex: 1;
  position: relative;
}

.hero-cover {
  flex-shrink: 0;
  position: relative;
}

.hero-cover img {
  width: 280px;
  height: auto;
  border-radius: 6px;
  box-shadow: 0 8px 40px rgba(0,0,0,0.5), 0 0 60px rgba(201,168,76,0.08);
  border: 1px solid rgba(255,255,255,0.06);
}

.hero h1 {
  font-family: 'Playfair Display', serif;
  font-size: 4.5rem;
  font-weight: 900;
  color: var(--gold);
  margin-bottom: 1.2rem;
  letter-spacing: 0.06em;
  border: none;
  padding: 0;
  position: relative;
}

.hero .subtitle {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 640px;
  line-height: 1.7;
  font-weight: 300;
  margin-bottom: 2.5rem;
}

.hero .cta {
  display: inline-block;
  background: var(--gold);
  color: var(--bg-deep);
  padding: 0.75rem 2.2rem;
  border-radius: 4px;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.9rem;
  letter-spacing: 0.05em;
  transition: all 0.2s;
}

.hero .cta:hover {
  background: var(--gold-light);
  box-shadow: 0 0 30px rgba(201,168,76,0.25);
}

/* ===== HOME — TABLE OF CONTENTS ===== */
.toc-section {
  max-width: var(--wide-width);
  margin: 0 auto;
  padding: 2rem 2rem 4rem;
}

.toc-section h2 {
  font-family: 'Playfair Display', serif;
  font-size: 1.6rem;
  text-align: center;
  margin-bottom: 3rem;
  color: var(--text-secondary);
  font-weight: 400;
  letter-spacing: 0.08em;
}

.part-group {
  margin-bottom: 2.5rem;
}

.part-label {
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--gold);
  margin-bottom: 1rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  display: block;
}

/* Chapter card grid on home */
.chapter-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 1rem;
}

.ch-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.5rem 1.3rem 1.3rem;
  text-decoration: none;
  color: var(--text);
  transition: all 0.25s ease;
  display: flex;
  flex-direction: column;
  min-height: 120px;
  overflow: hidden;
}

.ch-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--gold-dim), var(--gold), var(--gold-dim));
  opacity: 0;
  transition: opacity 0.25s;
}

.ch-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  transform: translateY(-2px);
  box-shadow: var(--glow);
}

.ch-card:hover::before { opacity: 1; }

.ch-card-num {
  font-family: 'Playfair Display', serif;
  font-size: 2rem;
  font-weight: 900;
  color: rgba(201,168,76,0.15);
  position: absolute;
  top: 0.6rem;
  right: 1rem;
  line-height: 1;
}

.ch-card-title {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text);
  margin-top: auto;
  line-height: 1.4;
}

.ch-card:hover .ch-card-title { color: var(--gold-light); }

/* ===== CHAPTER HEADER ===== */
.chapter-header {
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  padding: 4rem 2rem 3rem;
  text-align: center;
  position: relative;
}

.chapter-header::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 500px;
  height: 400px;
  background: radial-gradient(ellipse, rgba(201,168,76,0.04) 0%, transparent 70%);
  pointer-events: none;
}

.chapter-header .chapter-number {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--gold);
  margin-bottom: 0.8rem;
  font-weight: 600;
}

.chapter-header h1 {
  font-family: 'Playfair Display', serif;
  font-size: 2.8rem;
  font-weight: 900;
  border: none;
  color: var(--text);
  margin: 0;
  padding: 0;
  line-height: 1.2;
  position: relative;
}

/* ===== CHAPTER CONTENT ===== */
.chapter-content {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 2.5rem 2rem 4rem;
}

.chapter-content h1 {
  font-family: 'Playfair Display', serif;
  font-size: 2rem;
  font-weight: 700;
  margin: 3rem 0 1rem;
  line-height: 1.2;
  color: var(--gold);
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.6rem;
}

.chapter-content h2 {
  font-family: 'Playfair Display', serif;
  font-size: 1.5rem;
  font-weight: 700;
  margin: 2.5rem 0 0.8rem;
  color: var(--gold);
  padding-top: 1rem;
}

.chapter-content h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin: 2rem 0 0.6rem;
  color: var(--text);
}

.chapter-content h4 {
  font-size: 1rem;
  font-weight: 600;
  margin: 1.5rem 0 0.4rem;
  color: var(--text-secondary);
}

.chapter-content p {
  margin: 0.8rem 0;
  color: var(--text);
}

.chapter-content ul,
.chapter-content ol {
  margin: 0.8rem 0 0.8rem 1.5rem;
}

.chapter-content li {
  margin: 0.3rem 0;
}

.chapter-content strong {
  font-weight: 600;
  color: var(--text);
}

.chapter-content em {
  color: var(--text);
}

.chapter-content a {
  color: var(--gold);
  text-decoration: none;
  border-bottom: 1px solid rgba(201,168,76,0.3);
  transition: border-color 0.2s;
}

.chapter-content a:hover {
  border-color: var(--gold);
}

/* ===== IMAGES ===== */
.chapter-content img {
  display: block;
  max-width: 100%;
  max-height: 560px;
  width: auto;
  height: auto;
  object-fit: contain;
  margin: 2rem auto;
  border-radius: 6px;
  border: 1px solid var(--border);
  content-visibility: auto;
}

/* ===== TABLES ===== */
.chapter-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.88rem;
  line-height: 1.5;
  overflow-x: auto;
  display: block;
}

.chapter-content th {
  background: var(--bg-surface);
  color: var(--gold);
  font-weight: 600;
  text-align: left;
  padding: 0.7rem 0.8rem;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
  font-size: 0.82rem;
  letter-spacing: 0.03em;
}

.chapter-content td {
  padding: 0.6rem 0.8rem;
  border-bottom: 1px solid var(--border);
  color: var(--text-secondary);
}

.chapter-content tr:nth-child(even) td {
  background: rgba(255,255,255,0.015);
}

.chapter-content tr:hover td {
  background: rgba(201,168,76,0.03);
}

/* ===== CODE ===== */
.chapter-content code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85em;
  background: var(--bg-surface);
  padding: 0.15em 0.45em;
  border-radius: 3px;
  color: var(--gold-light);
}

.chapter-content pre {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  padding: 1.2rem 1.5rem;
  border-radius: 8px;
  overflow-x: auto;
  margin: 1.5rem 0;
  font-size: 0.88rem;
  line-height: 1.6;
}

.chapter-content pre code {
  background: none;
  padding: 0;
  color: var(--text);
}

/* ===== BLOCKQUOTES ===== */
.chapter-content blockquote {
  border-left: 3px solid var(--gold-dim);
  padding: 0.8rem 1.2rem;
  margin: 1.2rem 0;
  background: rgba(201,168,76,0.04);
  border-radius: 0 6px 6px 0;
}

.chapter-content blockquote p {
  margin: 0.3rem 0;
  color: var(--text-secondary);
}

/* ===== CHAPTER NAVIGATION ===== */
.chapter-nav {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 2rem 3rem;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
}

.chapter-nav a {
  display: flex;
  flex-direction: column;
  padding: 1rem 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  text-decoration: none;
  color: var(--text);
  transition: all 0.2s;
  max-width: 45%;
}

.chapter-nav a:hover {
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
}

.chapter-nav .nav-label {
  font-size: 0.7rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: 0.3rem;
}

.chapter-nav .nav-title {
  font-weight: 600;
  color: var(--gold);
  font-size: 0.9rem;
}

.chapter-nav .next { margin-left: auto; text-align: right; }

/* ===== HOME BUTTON ===== */
.home-btn {
  position: fixed;
  top: 1.2rem;
  left: 1.2rem;
  z-index: 1000;
  width: 2.6rem;
  height: 2.6rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 50%;
  color: var(--gold);
  text-decoration: none;
  transition: all 0.2s;
  box-shadow: 0 2px 12px rgba(0,0,0,0.4);
}

.home-btn:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  color: var(--gold-light);
  transform: scale(1.08);
}

/* ===== FOOTER ===== */
.site-footer {
  text-align: center;
  padding: 3rem 2rem 2rem;
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.85rem;
}

.site-footer a {
  color: var(--gold-dim);
  text-decoration: none;
  transition: color 0.2s;
}

.site-footer a:hover {
  color: var(--gold);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  .hero-inner { flex-direction: column-reverse; gap: 2rem; }
  .hero-text { text-align: center; }
  .hero-cover img { width: 200px; }
  .hero h1 { font-size: 2.8rem; }
  .hero .subtitle { font-size: 1rem; }
  .chapter-header h1 { font-size: 2rem; }
  .chapter-content { padding: 1.5rem 1rem 3rem; }
  .chapter-nav { flex-direction: column; }
  .chapter-nav a { max-width: 100%; }
  .chapter-nav .next { text-align: left; }
  .chapter-grid { grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); }
}

@media (max-width: 480px) {
  .hero { padding: 4rem 1rem 2rem; }
  .hero h1 { font-size: 2.2rem; }
  .site-logo { font-size: 1.1rem; }
  body { font-size: 16px; }
  .chapter-grid { grid-template-columns: 1fr 1fr; gap: 0.6rem; }
  .ch-card { padding: 1rem; min-height: 90px; }
}

/* ===== PRINT ===== */
@media print {
  .site-header, .site-footer, .chapter-nav { display: none; }
  .chapter-content { max-width: none; padding: 0; }
  body { font-size: 11pt; background: white; color: #111; }
  h1 { page-break-before: always; }
  table, img { page-break-inside: avoid; }
}