:root {
  --bg: #0a0a0a;
  --bg-raised: #141414;
  --bg-card: #1a1a1a;
  --text: #e8e4de;
  --text-dim: #8a8580;
  --text-muted: #5a5652;
  --accent: #c8956c;
  --accent-bright: #e8b078;
  --accent-dim: #8a6548;
  --brass: #b8944c;
  --brass-glow: #d4a854;
  --red: #c45c4c;
  --green: #6ca874;
  --blue: #5c8cbc;
  --serif: 'Cormorant Garamond', Georgia, serif;
  --sans: 'DM Sans', system-ui, sans-serif;
  --mono: 'JetBrains Mono', monospace;
}

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

html { scroll-behavior: smooth; font-size: 20px; }
a[target="_blank"] { color: inherit; text-decoration: underline; text-decoration-color: var(--text-muted); text-underline-offset: 2px; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-weight: 300;
  line-height: 1.7;
  overflow-x: hidden;
}

::selection {
  background: var(--accent);
  color: var(--bg);
}

/* ── GRAIN OVERLAY ── */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.04'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 9999;
}

/* ── SCROLLBAR ── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--accent-dim); border-radius: 3px; }

/* ── HERO ── */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 2rem;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 50% at 50% 50%, rgba(200, 149, 108, 0.08) 0%, transparent 70%),
    radial-gradient(ellipse 60% 80% at 20% 80%, rgba(92, 140, 188, 0.04) 0%, transparent 60%);
}

.hero-eyebrow {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 2rem;
  opacity: 0;
  animation: fadeUp 1s 0.3s ease-out forwards;
}

.hero h1 {
  font-family: var(--serif);
  font-weight: 300;
  font-size: clamp(2.5rem, 7vw, 6rem);
  line-height: 1.1;
  color: var(--text);
  position: relative;
  opacity: 0;
  animation: fadeUp 1.2s 0.5s ease-out forwards;
}

.hero h1 em {
  font-style: italic;
  color: var(--accent-bright);
}

.hero-sub {
  font-family: var(--serif);
  font-size: clamp(1rem, 2vw, 1.4rem);
  font-weight: 300;
  font-style: italic;
  color: var(--text-dim);
  margin-top: 1.5rem;
  max-width: 600px;
  opacity: 0;
  animation: fadeUp 1s 0.8s ease-out forwards;
}

.hero-line {
  width: 1px;
  height: 80px;
  background: linear-gradient(to bottom, var(--accent), transparent);
  margin-top: 3rem;
  opacity: 0;
  animation: fadeUp 1s 1.2s ease-out forwards;
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ── SECTIONS ── */
section {
  padding: 6rem 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

.section-num {
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--accent-dim);
  margin-bottom: 1rem;
}

section h2 {
  font-family: var(--serif);
  font-weight: 300;
  font-size: clamp(1.8rem, 4vw, 3.2rem);
  line-height: 1.2;
  margin-bottom: 0.5rem;
}

section h2 em { font-style: italic; color: var(--accent-bright); }

.section-lead {
  font-family: var(--serif);
  font-size: 1.15rem;
  font-style: italic;
  color: var(--text-dim);
  max-width: 680px;
  margin-bottom: 3rem;
  line-height: 1.8;
}

.prose {
  max-width: 680px;
  color: var(--text-dim);
  font-size: 1.05rem;
  margin-bottom: 2rem;
}

.prose strong { color: var(--text); font-weight: 500; }

/* ── DIVIDERS ── */
.divider {
  display: flex;
  align-items: center;
  gap: 1rem;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

.divider::before, .divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: linear-gradient(to right, transparent, var(--text-muted), transparent);
  opacity: 0.3;
}

.divider span {
  font-family: var(--mono);
  font-size: 0.6rem;
  letter-spacing: 0.3em;
  color: var(--text-muted);
  text-transform: uppercase;
  white-space: nowrap;
}

/* ── IMAGE GALLERIES ── */
.gallery {
  display: grid;
  gap: 1rem;
  margin: 2rem 0;
}

.gallery-3 { grid-template-columns: repeat(3, 1fr); }
.gallery-4 { grid-template-columns: repeat(4, 1fr); }
.gallery-5 { grid-template-columns: repeat(5, 1fr); }
.gallery-6 { grid-template-columns: repeat(6, 1fr); }
.gallery-2 { grid-template-columns: repeat(2, 1fr); }

.gallery-item {
  position: relative;
  border-radius: 6px;
  overflow: hidden;
  cursor: pointer;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  background: var(--bg-card);
}

.gallery-item:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0,0,0,0.5);
}

.gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.5s ease;
}

.gallery-item:hover img { transform: scale(1.05); }

.gallery-item .label {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 2rem 0.8rem 0.6rem;
  background: linear-gradient(to top, rgba(0,0,0,0.85) 0%, transparent 100%);
  font-family: var(--mono);
  font-size: 0.6rem;
  letter-spacing: 0.05em;
  color: var(--text-dim);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.gallery-item:hover .label { opacity: 1; }

/* ── COMPARISON SLIDER ── */
.comparison-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin: 2rem 0;
}

.comparison-card {
  background: var(--bg-card);
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid rgba(255,255,255,0.04);
  transition: border-color 0.3s ease;
}

.comparison-card:hover { border-color: var(--accent-dim); }

.comparison-card img {
  width: 100%;
  aspect-ratio: 2/1;
  object-fit: cover;
  display: block;
}

.comparison-card .tag {
  padding: 0.6rem 0.8rem;
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  color: var(--text-dim);
  text-transform: uppercase;
  border-top: 1px solid rgba(255,255,255,0.04);
}

/* ── PIPELINE DIAGRAM ── */
.pipeline {
  display: flex;
  align-items: center;
  gap: 0;
  margin: 3rem 0;
  overflow-x: auto;
  padding: 2rem 0;
}

.pipeline-node {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-width: 100px;
  padding: 0 0.5rem;
}

.pipeline-icon {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  margin-bottom: 0.5rem;
  border: 1px solid rgba(255,255,255,0.1);
  transition: all 0.3s ease;
}

.pipeline-node:hover .pipeline-icon {
  border-color: var(--accent);
  box-shadow: 0 0 20px rgba(200, 149, 108, 0.2);
}

.pipeline-label {
  font-family: var(--mono);
  font-size: 0.6rem;
  letter-spacing: 0.05em;
  color: var(--text-dim);
  text-align: center;
  text-transform: uppercase;
}

.pipeline-arrow {
  color: var(--text-muted);
  font-size: 1.2rem;
  min-width: 30px;
  text-align: center;
  opacity: 0.4;
}

.pipeline-fork {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  min-width: 100px;
  align-items: center;
}

.pipeline-fork .pipeline-icon { width: 44px; height: 44px; font-size: 1.1rem; }
.pipeline-fork .pipeline-label { font-size: 0.55rem; }

/* ── STATS ── */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1rem;
  margin: 2rem 0;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid rgba(255,255,255,0.04);
  border-radius: 8px;
  padding: 1.5rem;
  text-align: center;
  transition: border-color 0.3s ease;
}

.stat-card:hover { border-color: var(--accent-dim); }

.stat-num {
  font-family: var(--serif);
  font-size: 2.5rem;
  font-weight: 600;
  color: var(--accent-bright);
  line-height: 1;
}

.stat-label {
  font-family: var(--mono);
  font-size: 0.6rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-top: 0.5rem;
}

/* ── TIMELINE ── */
.timeline {
  position: relative;
  margin: 3rem 0;
  padding-left: 2rem;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 1px;
  background: linear-gradient(to bottom, var(--accent-dim), var(--text-muted), transparent);
}

.timeline-item {
  position: relative;
  margin-bottom: 2.5rem;
  padding-left: 1.5rem;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -2.35rem;
  top: 0.4rem;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 8px rgba(200, 149, 108, 0.4);
}

.timeline-date {
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.15em;
  color: var(--accent-dim);
  text-transform: uppercase;
  margin-bottom: 0.3rem;
}

.timeline-title {
  font-family: var(--serif);
  font-size: 1.2rem;
  font-weight: 400;
  color: var(--text);
  margin-bottom: 0.3rem;
}

.timeline-desc {
  font-size: 0.85rem;
  color: var(--text-dim);
  max-width: 600px;
}

/* ── ISSUE TRACKER VIZ ── */
.tracker-bar {
  display: flex;
  height: 28px;
  border-radius: 4px;
  overflow: hidden;
  margin: 1rem 0;
  background: var(--bg-card);
}

.tracker-bar .segment {
  transition: flex 0.5s ease;
  position: relative;
}

.tracker-bar .segment:hover::after {
  content: attr(data-label);
  position: absolute;
  top: -2rem;
  left: 50%;
  transform: translateX(-50%);
  font-family: var(--mono);
  font-size: 0.6rem;
  color: var(--text);
  white-space: nowrap;
  background: var(--bg-card);
  padding: 0.2rem 0.5rem;
  border-radius: 3px;
  border: 1px solid rgba(255,255,255,0.1);
}

.tracker-legend {
  display: flex;
  gap: 1.5rem;
  margin-top: 0.5rem;
  flex-wrap: wrap;
}

.tracker-legend span {
  font-family: var(--mono);
  font-size: 0.6rem;
  letter-spacing: 0.05em;
  color: var(--text-dim);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.tracker-legend .dot {
  width: 8px;
  height: 8px;
  border-radius: 2px;
  display: inline-block;
}

/* ── LIGHTBOX ── */
.lightbox {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.92);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 10000;
  cursor: zoom-out;
  backdrop-filter: blur(8px);
}

.lightbox.active { display: flex; }

.lightbox img {
  max-width: 90vw;
  max-height: 90vh;
  object-fit: contain;
  border-radius: 4px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.5);
}

.lightbox-caption {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--text-dim);
  letter-spacing: 0.1em;
  text-align: center;
}

/* ── QUOTE ── */
.quote-block {
  border-left: 2px solid var(--accent-dim);
  padding: 1.5rem 2rem;
  margin: 2rem 0;
  background: rgba(200, 149, 108, 0.03);
  border-radius: 0 8px 8px 0;
}

.quote-block p {
  font-family: var(--serif);
  font-size: 1.2rem;
  font-style: italic;
  color: var(--text);
  line-height: 1.7;
}

.quote-block cite {
  display: block;
  margin-top: 0.8rem;
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  font-style: normal;
  text-transform: uppercase;
}

/* ── SCROLL REVEAL ── */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ── RESPONSIVE ── */
@media (max-width: 768px) {
  section { padding: 4rem 1.5rem; }
  .gallery-3, .gallery-4, .gallery-5, .gallery-6 { grid-template-columns: repeat(2, 1fr); }
  .comparison-row { grid-template-columns: repeat(2, 1fr); }
  .pipeline { flex-wrap: wrap; justify-content: center; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 480px) {
  .gallery-3, .gallery-4, .gallery-5, .gallery-6 { grid-template-columns: 1fr; }
}

/* ── MATERIAL STRIP ── */
.material-strip {
  display: flex;
  gap: 0;
  margin: 2rem 0;
  border-radius: 8px;
  overflow: hidden;
  height: 200px;
}

.material-strip img {
  flex: 1;
  object-fit: cover;
  min-width: 0;
  transition: flex 0.4s ease;
  cursor: pointer;
}

.material-strip img:hover { flex: 3; }

/* ── CHAPTER INTRO ── */
.chapter-intro {
  text-align: center;
  padding: 4rem 2rem;
  max-width: 700px;
  margin: 0 auto;
}

.chapter-intro h2 {
  margin-bottom: 1rem;
}

/* ── NAV ── */
.doc-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  flex-direction: column;
  padding: 0.6rem 2rem;
  background: rgba(10, 10, 10, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(255,255,255,0.06);
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.nav-tier {
  display: flex;
  align-items: center;
  gap: 1.2rem;
  padding: 0.35rem 0;
}
.nav-now { border-bottom: 1px solid rgba(255,255,255,0.04); }
.nav-label {
  color: var(--text-muted);
  font-size: 0.5rem;
  letter-spacing: 0.2em;
  min-width: 4em;
  flex-shrink: 0;
}
.nav-now .nav-label { color: var(--accent-dim); }
.doc-nav a {
  color: var(--text-dim);
  text-decoration: none;
  transition: color 0.2s;
}
.doc-nav a:hover, .doc-nav a.active {
  color: var(--accent-bright);
}
.nav-now a { color: var(--text); }
.nav-now a:hover, .nav-now a.active { color: var(--accent-bright); }

@media (max-width: 600px) {
  .doc-nav { padding: 0.4rem 1rem; }
  .nav-tier { gap: 0.8rem; flex-wrap: wrap; }
  .nav-label { display: none; }
}