:root {
    --ink: #1a1814;
    --ink-light: #3d3830;
    --ink-faint: #7a7168;
    --parchment: #f7f3ec;
    --parchment-dark: #ede8df;
    --parchment-darker: #e0d9cc;
    --accent: #8b3a1a;
    --accent-light: #b85c35;
    --gold: #9a7b2e;
    --gold-light: #c4a24e;
    --flag-bg: #fdf6f0;
    --flag-border: #c4714a;
    --insight-bg: #f0f4f8;
    --insight-border: #4a7090;
    --resolution-color: #2d5a3d;
  }

  * { margin: 0; padding: 0; box-sizing: border-box; }
  html { scroll-behavior: smooth; }

  body {
    background: var(--parchment);
    color: var(--ink);
    font-family: 'Libre Baskerville', Georgia, serif;
    font-size: 17px;
    line-height: 1.85;
    min-height: 100vh;
  }

  /* SIDEBAR */
  .sidebar {
    position: fixed;
    left: 0; top: 0; bottom: 0;
    width: 240px;
    background: var(--ink);
    padding: 2.5rem 1.5rem;
    overflow-y: auto;
    z-index: 100;
  }

  .sidebar-title {
    font-family: 'Cormorant Garamond', serif;
    font-size: 1.1rem;
    font-weight: 300;
    color: var(--gold-light);
    letter-spacing: 0.15em;
    text-transform: uppercase;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid #333;
  }

  .nav-link {
    display: block;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.65rem;
    color: #888;
    text-decoration: none;
    padding: 0.3rem 0.5rem;
    border-radius: 2px;
    letter-spacing: 0.05em;
    transition: color 0.2s, background 0.2s;
    line-height: 1.4;
  }

  .nav-link:hover { color: var(--gold-light); background: rgba(255,255,255,0.05); }
  .nav-link.part { color: #bbb; font-size: 0.7rem; margin-top: 0.8rem; font-weight: 400; }
  .nav-link.part:hover { color: var(--gold-light); }

  /* MAIN */
  .main { margin-left: 240px; min-height: 100vh; }

  /* HERO */
  .hero {
    background: var(--ink);
    color: var(--parchment);
    padding: 8rem 6rem 6rem;
    position: relative;
    overflow: hidden;
  }

  .hero::before {
    content: '';
    position: absolute;
    top: -50%; left: -10%;
    width: 60%; height: 200%;
    background: radial-gradient(ellipse, rgba(138,90,30,0.12) 0%, transparent 70%);
    pointer-events: none;
  }

  .hero::after {
    content: '';
    position: absolute;
    bottom: 0; left: 0; right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--gold), transparent);
  }

  .hero-eyebrow {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.7rem;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    color: var(--gold-light);
    margin-bottom: 2rem;
    opacity: 0;
    animation: fadeUp 0.8s ease 0.2s forwards;
  }

  .hero-title {
    font-family: 'Cormorant Garamond', serif;
    font-size: clamp(4rem, 8vw, 7rem);
    font-weight: 300;
    line-height: 1;
    letter-spacing: -0.02em;
    margin-bottom: 1.5rem;
    opacity: 0;
    animation: fadeUp 0.8s ease 0.4s forwards;
  }

  .hero-title em { font-style: italic; color: var(--gold-light); }

  .hero-subtitle {
    font-family: 'Cormorant Garamond', serif;
    font-size: 1.3rem;
    font-weight: 300;
    font-style: italic;
    color: #aaa;
    max-width: 600px;
    margin-bottom: 3rem;
    opacity: 0;
    animation: fadeUp 0.8s ease 0.6s forwards;
  }

  .hero-tagline {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.75rem;
    color: #666;
    letter-spacing: 0.1em;
    opacity: 0;
    animation: fadeUp 0.8s ease 0.8s forwards;
  }

  @keyframes fadeUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
  }

  /* CONTENT */
  .content {
    max-width: 780px;
    margin: 0 auto;
    padding: 5rem 4rem;
  }

  /* PART HEADER */
  .part-header {
    margin: 5rem 0 2.5rem;
    padding-bottom: 1.5rem;
    border-bottom: 2px solid var(--ink);
    display: flex;
    align-items: baseline;
    gap: 1.5rem;
  }

  .part-number {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.7rem;
    letter-spacing: 0.2em;
    color: var(--accent);
    text-transform: uppercase;
    white-space: nowrap;
  }

  .part-title {
    font-family: 'Cormorant Garamond', serif;
    font-size: 2.2rem;
    font-weight: 300;
    line-height: 1.2;
    color: var(--ink);
  }

  /* SECTION */
  .section-header { margin: 3rem 0 1.2rem; }
  .section-title {
    font-family: 'Cormorant Garamond', serif;
    font-size: 1.4rem;
    font-weight: 600;
    color: var(--ink-light);
  }

  p { margin-bottom: 1.3rem; color: var(--ink-light); }

  blockquote {
    margin: 2.5rem 0;
    padding: 1.5rem 2rem 1.5rem 2.5rem;
    border-left: 3px solid var(--gold);
    background: var(--parchment-dark);
    font-style: italic;
    font-size: 1.05rem;
    color: var(--ink);
    position: relative;
  }

  blockquote::before {
    content: '\201C';
    font-family: 'Cormorant Garamond', serif;
    font-size: 4rem;
    color: var(--gold);
    opacity: 0.3;
    position: absolute;
    top: -0.5rem;
    left: 0.8rem;
    line-height: 1;
  }

  /* FLAG BOX */
  .flag {
    margin: 2.5rem 0;
    border: 1px solid var(--flag-border);
    border-left: 4px solid var(--flag-border);
    background: var(--flag-bg);
    border-radius: 0 4px 4px 0;
    overflow: hidden;
  }

  .flag-header {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    padding: 0.9rem 1.4rem;
    background: rgba(196,113,74,0.08);
    border-bottom: 1px solid rgba(196,113,74,0.2);
  }

  .flag-number {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.65rem;
    letter-spacing: 0.15em;
    color: var(--flag-border);
    text-transform: uppercase;
  }

  .flag-title {
    font-family: 'Cormorant Garamond', serif;
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--accent);
  }

  .flag-body { padding: 1.2rem 1.4rem; }
  .flag-body p { font-size: 0.92rem; line-height: 1.75; margin-bottom: 0.8rem; }
  .flag-body p:last-child { margin-bottom: 0; }

  .flag-resolution {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px dashed rgba(45,90,61,0.3);
  }

  .flag-resolution-label {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.65rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--resolution-color);
    margin-bottom: 0.4rem;
  }

  .flag-resolution p { font-size: 0.92rem; color: var(--resolution-color); font-style: italic; }

  /* INSIGHT BOX */
  .insight {
    margin: 2.5rem 0;
    border: 1px solid var(--insight-border);
    border-left: 4px solid var(--insight-border);
    background: var(--insight-bg);
    border-radius: 0 4px 4px 0;
    overflow: hidden;
  }

  .insight-header {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    padding: 0.9rem 1.4rem;
    background: rgba(74,112,144,0.08);
    border-bottom: 1px solid rgba(74,112,144,0.2);
  }

  .insight-label {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.65rem;
    letter-spacing: 0.15em;
    color: var(--insight-border);
    text-transform: uppercase;
  }

  .insight-title {
    font-family: 'Cormorant Garamond', serif;
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--insight-border);
  }

  .insight-body { padding: 1.2rem 1.4rem; }
  .insight-body p { font-size: 0.92rem; line-height: 1.75; margin-bottom: 0; }

  /* MASTER TABLE */
  .master-table-wrap {
    margin: 2.5rem 0;
    overflow-x: auto;
    border: 1px solid var(--parchment-darker);
    border-radius: 4px;
  }

  .master-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.82rem;
  }

  .master-table th {
    background: var(--ink);
    color: var(--parchment);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.65rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    padding: 0.9rem 1rem;
    text-align: left;
    font-weight: 400;
  }

  .master-table td {
    padding: 0.75rem 1rem;
    vertical-align: top;
    border-bottom: 1px solid var(--parchment-darker);
    line-height: 1.5;
  }

  .master-table tr:last-child td { border-bottom: none; }
  .master-table tr:hover td { background: var(--parchment-dark); }
  .master-table td:first-child { font-family: 'JetBrains Mono', monospace; font-size: 0.7rem; color: var(--accent); white-space: nowrap; }
  .master-table td:nth-child(2) { color: var(--ink-light); }
  .master-table td:nth-child(3) { color: var(--accent); font-style: italic; }
  .master-table td:nth-child(4) { color: var(--resolution-color); }

  /* EQUATION */
  .equation {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.9rem;
    background: var(--parchment-dark);
    border: 1px solid var(--parchment-darker);
    padding: 1.2rem 1.8rem;
    margin: 1.8rem 0;
    text-align: center;
    letter-spacing: 0.05em;
    color: var(--ink);
    border-radius: 2px;
    overflow-x: auto;
  }

  /* LIST */
  ul.scroll-list { margin: 1rem 0 1.5rem 1.5rem; list-style: none; }
  ul.scroll-list li {
    position: relative;
    padding-left: 1.5rem;
    margin-bottom: 0.6rem;
    font-size: 0.95rem;
    color: var(--ink-light);
    line-height: 1.7;
  }
  ul.scroll-list li::before { content: '\2014'; position: absolute; left: 0; color: var(--gold); font-family: 'Cormorant Garamond', serif; }

  /* CLOSING */
  .closing {
    margin: 5rem 0 2rem;
    padding: 3rem;
    background: var(--ink);
    color: var(--parchment);
    text-align: center;
    position: relative;
    overflow: hidden;
  }

  .closing::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at center, rgba(154,123,46,0.1) 0%, transparent 70%);
  }

  .closing-main {
    font-family: 'Cormorant Garamond', serif;
    font-size: 1.6rem;
    font-weight: 300;
    font-style: italic;
    line-height: 1.5;
    margin-bottom: 1.5rem;
    color: var(--parchment);
    position: relative;
  }

  .closing-sub {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.72rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--gold-light);
    position: relative;
  }

  .divider {
    border: none;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--parchment-darker), transparent);
    margin: 3rem 0;
  }

  /* SCROLL REVEAL */
  .reveal {
    opacity: 0;
    transform: translateY(16px);
    transition: opacity 0.6s ease, transform 0.6s ease;
  }
  .reveal.visible { opacity: 1; transform: translateY(0); }

  @media (max-width: 900px) {
    .sidebar { display: none; }
    .main { margin-left: 0; }
    .hero { padding: 4rem 2rem 3rem; }
    .content { padding: 3rem 1.5rem; }
    .hero-title { font-size: 3.5rem; }
  }