/* ============================================
   AMBIENT MEDIA — 2026 DESIGN SYSTEM
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@300;400;500;600;700&family=Space+Mono:ital,wght@0,400;0,700;1,400&family=Bebas+Neue&display=swap');

/* ---- TOKENS ---- */
:root {
  --bg: #14141e;
  --bg-2: #1b1b28;
  --bg-3: #222231;
  --surface: #27273a;
  --surface-2: #31314a;
  --border: rgba(255,255,255,0.11);
  --border-strong: rgba(255,255,255,0.22);

  --text: #f2f2f6;
  --text-muted: rgba(242,242,246,0.65);
  --text-dim: rgba(242,242,246,0.35);

  --nav-h: 68px;

  --accent: #b3ff3f;
  --accent-2: #ff3f8e;
  --accent-3: #3fb3ff;
  --accent-dim: rgba(179,255,63,0.12);
  --accent-glow: rgba(179,255,63,0.25);

  --font-display: 'Bebas Neue', sans-serif;
  --font-body: 'Space Grotesk', sans-serif;
  --font-mono: 'Space Mono', monospace;

  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 40px;
  --radius-full: 9999px;

  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out-quart: cubic-bezier(0.76, 0, 0.24, 1);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  scroll-padding-top: var(--nav-h);
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.6;
  overflow-x: hidden;
  cursor: none;
}

/* ---- CUSTOM CURSOR ---- */
.cursor {
  position: fixed;
  width: 12px;
  height: 12px;
  background: var(--accent);
  border-radius: 50%;
  pointer-events: none;
  z-index: 9999;
  transform: translate(-50%, -50%);
  transition: transform 0.1s, width 0.3s var(--ease-out-expo), height 0.3s var(--ease-out-expo), background 0.3s;
  mix-blend-mode: exclusion;
}
.cursor-follower {
  position: fixed;
  width: 36px;
  height: 36px;
  border: 1.5px solid rgba(179,255,63,0.5);
  border-radius: 50%;
  pointer-events: none;
  z-index: 9998;
  transform: translate(-50%, -50%);
  transition: transform 0.18s var(--ease-out-expo), width 0.4s var(--ease-out-expo), height 0.4s var(--ease-out-expo);
}
body:has(a:hover) .cursor, body:has(button:hover) .cursor { width: 6px; height: 6px; }
body:has(a:hover) .cursor-follower, body:has(button:hover) .cursor-follower { width: 56px; height: 56px; }

/* ---- GRAIN TEXTURE ---- */
body::before {
  content: '';
  position: fixed;
  inset: -200%;
  width: 400%;
  height: 400%;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='1'/%3E%3C/svg%3E");
  background-repeat: repeat;
  background-size: 128px 128px;
  opacity: 0.025;
  pointer-events: none;
  z-index: 1000;
  animation: grain 0.5s steps(2) infinite;
}
@keyframes grain {
  0%, 100% { transform: translate(0, 0); }
  10% { transform: translate(-2%, -3%); }
  20% { transform: translate(3%, 2%); }
  30% { transform: translate(-3%, 1%); }
  40% { transform: translate(2%, -2%); }
  50% { transform: translate(-1%, 3%); }
  60% { transform: translate(3%, -1%); }
  70% { transform: translate(-2%, 2%); }
  80% { transform: translate(1%, -3%); }
  90% { transform: translate(-3%, 1%); }
}

/* ---- NAVIGATION ---- */
body > nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 500;
  height: var(--nav-h);
  padding: 0 40px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(20,20,30,0.82);
  backdrop-filter: blur(24px) saturate(1.4);
  -webkit-backdrop-filter: blur(24px) saturate(1.4);
  border-bottom: 1px solid var(--border);
  transition: background 0.4s;
}
body > nav .logo {
  font-family: var(--font-display);
  font-size: 1.4rem;
  letter-spacing: 0.08em;
  color: var(--text);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 10px;
}
body > nav .logo span {
  color: var(--accent);
}
/* nav-links — created dynamically by JS, see script.js */
.nav-overlay {
  position: fixed;
  inset: 0;
  z-index: 9000;
  background: rgba(14,14,22,0.97);
  backdrop-filter: blur(32px);
  -webkit-backdrop-filter: blur(32px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
}
.nav-overlay a {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 5vw, 3rem);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-muted);
  text-decoration: none;
  padding: 10px 40px;
  border-radius: var(--radius-full);
  transition: color 0.2s, background 0.2s;
}
.nav-overlay a:hover, .nav-overlay a.active {
  color: var(--accent);
  background: var(--accent-dim);
}
.nav-hamburger {
  display: flex;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  position: fixed;
  top: 14px;
  right: 24px;
  z-index: 9999;
  transition: background 0.2s, border-color 0.2s;
}
.nav-hamburger:hover {
  background: var(--surface-2);
  border-color: var(--border-strong);
}
.nav-hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: all 0.3s;
}

/* ---- HERO SECTION ---- */
.hero {
  min-height: 100svh;
  display: grid;
  place-items: center;
  position: relative;
  overflow: hidden;
  padding: calc(var(--nav-h) + 60px) 40px 80px;
}
.hero-bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black 30%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black 30%, transparent 100%);
}
.hero-bg-blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(120px);
  animation: blob-float 8s ease-in-out infinite;
}
.hero-bg-blob-1 {
  width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(179,255,63,0.12), transparent 70%);
  top: -100px; left: -100px;
}
.hero-bg-blob-2 {
  width: 400px; height: 400px;
  background: radial-gradient(circle, rgba(255,63,142,0.1), transparent 70%);
  bottom: -50px; right: 10%;
  animation-delay: -3s;
}
.hero-bg-blob-3 {
  width: 300px; height: 300px;
  background: radial-gradient(circle, rgba(63,179,255,0.08), transparent 70%);
  top: 40%; left: 60%;
  animation-delay: -5s;
}
@keyframes blob-float {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(30px, -30px) scale(1.05); }
  66% { transform: translate(-20px, 20px) scale(0.95); }
}
.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 1000px;
  width: 100%;
}
.hero-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-dim);
  border: 1px solid rgba(179,255,63,0.2);
  border-radius: var(--radius-full);
  padding: 6px 16px;
  margin-bottom: 32px;
  animation: fade-up 0.8s var(--ease-out-expo) both;
}
.hero-label::before {
  content: '';
  width: 6px; height: 6px;
  background: var(--accent);
  border-radius: 50%;
  animation: pulse-dot 2s ease infinite;
}
@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.8); }
}
.hero-title {
  font-family: var(--font-display);
  font-size: clamp(4rem, 12vw, 11rem);
  line-height: 0.9;
  letter-spacing: 0.02em;
  margin-bottom: 28px;
  animation: fade-up 0.8s var(--ease-out-expo) 0.1s both;
}
.hero-title .line-accent { color: var(--accent); }
.hero-subtitle {
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: var(--text-muted);
  max-width: 560px;
  margin: 0 auto 48px;
  line-height: 1.7;
  animation: fade-up 0.8s var(--ease-out-expo) 0.2s both;
}
.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  animation: fade-up 0.8s var(--ease-out-expo) 0.3s both;
}
.hero-scroll-hint {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-dim);
  animation: fade-in 1s 0.8s both;
}
.scroll-line {
  width: 1px;
  height: 50px;
  background: linear-gradient(to bottom, var(--accent), transparent);
  animation: scroll-line 2s ease-in-out infinite;
}
@keyframes scroll-line {
  0% { transform: scaleY(0); transform-origin: top; }
  50% { transform: scaleY(1); transform-origin: top; }
  51% { transform: scaleY(1); transform-origin: bottom; }
  100% { transform: scaleY(0); transform-origin: bottom; }
}

/* ---- BUTTONS ---- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 28px;
  border-radius: var(--radius-full);
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  cursor: pointer;
  text-decoration: none;
  border: none;
  transition: all 0.3s var(--ease-out-expo);
  position: relative;
  overflow: hidden;
}
.btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(255,255,255,0.1);
  transform: translateX(-100%);
  transition: transform 0.4s var(--ease-out-expo);
}
.btn:hover::before { transform: translateX(0); }
.btn-primary {
  background: var(--accent);
  color: #080808;
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 20px 40px var(--accent-glow); }
.btn-secondary {
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border-strong);
}
.btn-secondary:hover { background: var(--surface-2); transform: translateY(-2px); }
.btn-ghost {
  background: transparent;
  color: var(--text-muted);
  border: 1px solid var(--border);
}
.btn-ghost:hover { color: var(--text); border-color: var(--border-strong); }
.btn svg { width: 18px; height: 18px; flex-shrink: 0; }
.btn-sm { padding: 8px 18px; font-size: 0.8rem; }

/* ---- SECTION COMMONS ---- */
section { padding: 100px 40px; }
.section-header {
  margin-bottom: 64px;
}
.section-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 12px;
}
.section-label::before {
  content: '';
  display: block;
  width: 32px;
  height: 1px;
  background: var(--accent);
}
.section-title {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 6vw, 5rem);
  line-height: 0.95;
  letter-spacing: 0.02em;
}
.section-desc {
  margin-top: 20px;
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 600px;
  line-height: 1.75;
}

/* ---- CARDS ---- */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: border-color 0.3s, transform 0.3s, box-shadow 0.3s;
  position: relative;
  overflow: hidden;
}
.card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  opacity: 0;
  transition: opacity 0.3s;
}
.card:hover {
  border-color: var(--border-strong);
  transform: translateY(-4px);
  box-shadow: 0 24px 48px rgba(0,0,0,0.4);
}
.card:hover::before { opacity: 1; }
.card-number {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  color: var(--accent);
  margin-bottom: 16px;
}
.card-title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 12px;
  line-height: 1.3;
}
.card-body {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.7;
}
.card-icon {
  width: 48px; height: 48px;
  background: var(--accent-dim);
  border: 1px solid rgba(179,255,63,0.2);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  font-size: 1.4rem;
}

/* ---- BENTO GRID ---- */
.bento {
  display: grid;
  gap: 16px;
}
.bento-2 { grid-template-columns: repeat(2, 1fr); }
.bento-3 { grid-template-columns: repeat(3, 1fr); }
.bento-4 { grid-template-columns: repeat(4, 1fr); }
.bento-item { border-radius: var(--radius-lg); overflow: hidden; }
.bento-span-2 { grid-column: span 2; }
.bento-span-3 { grid-column: span 3; }
.bento-row-2 { grid-row: span 2; }

/* ---- QUOTE BLOCK ---- */
.quote-block {
  position: relative;
  padding: 40px 48px;
  border-left: 3px solid var(--accent);
  background: var(--surface);
  border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
  margin: 40px 0;
}
.quote-block blockquote {
  font-size: 1.15rem;
  line-height: 1.75;
  color: var(--text);
  font-style: italic;
  margin-bottom: 12px;
}
.quote-block cite {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--accent);
  text-transform: uppercase;
  font-style: normal;
}
.quote-mark {
  font-family: var(--font-display);
  font-size: 8rem;
  line-height: 0;
  color: var(--accent);
  opacity: 0.12;
  position: absolute;
  top: 20px; left: 20px;
  pointer-events: none;
}

/* ---- TAG ---- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 14px;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-muted);
  transition: all 0.2s;
}
.tag-accent { border-color: rgba(179,255,63,0.3); color: var(--accent); background: var(--accent-dim); }
.tag-pink { border-color: rgba(255,63,142,0.3); color: var(--accent-2); background: rgba(255,63,142,0.1); }
.tag-blue { border-color: rgba(63,179,255,0.3); color: var(--accent-3); background: rgba(63,179,255,0.1); }

/* ---- DIVIDER ---- */
.divider {
  height: 1px;
  background: var(--border);
  margin: 24px 0;
}

/* ---- CHAPTER NAV ---- */
.chapter-nav {
  padding: 60px 40px 0;
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  border-top: 1px solid var(--border);
  margin-top: 80px;
}
.chapter-nav-title {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-right: 8px;
}

/* ---- STAT BOX ---- */
.stat-box {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
}
.stat-value {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 5vw, 4rem);
  color: var(--accent);
  line-height: 1;
  margin-bottom: 8px;
}
.stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* ---- PRINCIPLE ITEM ---- */
.principle {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 24px;
  padding: 32px 0;
  border-bottom: 1px solid var(--border);
  align-items: start;
}
.principle:last-child { border-bottom: none; }
.principle-num {
  font-family: var(--font-display);
  font-size: 3.5rem;
  color: var(--text-dim);
  line-height: 1;
  padding-top: 4px;
}
.principle-name {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text);
}
.principle-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.75;
}
.principle-example {
  margin-top: 16px;
  padding: 16px 20px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.65;
}
.principle-example strong {
  color: var(--accent);
  font-weight: 600;
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

/* ---- CATEGORY GRID ---- */
.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
  margin-top: 48px;
}
.category-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: all 0.3s var(--ease-out-expo);
}
.category-card:hover {
  border-color: var(--border-strong);
  background: var(--surface-2);
  transform: translateY(-4px);
}
.cat-letter {
  font-family: var(--font-display);
  font-size: 5rem;
  line-height: 1;
  color: var(--accent);
  opacity: 0.2;
  margin-bottom: -16px;
}
.cat-title {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text);
}
.cat-items {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.cat-items li {
  font-size: 0.82rem;
  color: var(--text-muted);
  display: flex;
  align-items: flex-start;
  gap: 8px;
  line-height: 1.5;
}
.cat-items li::before {
  content: '—';
  color: var(--accent);
  flex-shrink: 0;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  margin-top: 1px;
}

/* ---- TIMELINE ---- */
.timeline {
  position: relative;
  padding-left: 40px;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 1px;
  background: linear-gradient(to bottom, var(--accent), transparent);
}
.timeline-item {
  position: relative;
  padding-bottom: 48px;
}
.timeline-item:last-child { padding-bottom: 0; }
.timeline-item::before {
  content: '';
  position: absolute;
  left: -44px; top: 6px;
  width: 9px; height: 9px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--bg);
  box-shadow: 0 0 0 4px var(--accent-dim);
}
.timeline-year {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  color: var(--accent);
  margin-bottom: 8px;
}
.timeline-title {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text);
}
.timeline-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* ---- ADVANTAGES LIST ---- */
.adv-list {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 12px;
}
.adv-list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 16px 20px;
  border-radius: var(--radius-md);
  background: var(--surface);
  border: 1px solid var(--border);
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.5;
}
.adv-list li::before {
  content: '+';
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--accent);
  flex-shrink: 0;
  margin-top: 1px;
}
.disadv-list li::before {
  content: '−';
  color: var(--accent-2);
}
.disadv-list li { border-color: rgba(255,63,142,0.1); }

/* ---- DEFINITION BOX ---- */
.definition-box {
  background: linear-gradient(135deg, var(--surface) 0%, rgba(179,255,63,0.04) 100%);
  border: 1px solid rgba(179,255,63,0.2);
  border-radius: var(--radius-xl);
  padding: 56px;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.definition-box::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 50% 0%, rgba(179,255,63,0.08), transparent 60%);
  pointer-events: none;
}
.definition-text {
  font-size: clamp(1rem, 2vw, 1.3rem);
  line-height: 1.75;
  color: var(--text);
  max-width: 800px;
  margin: 0 auto 24px;
  position: relative;
}
.definition-text em { color: var(--accent); font-style: normal; font-weight: 700; }

/* ---- PROCESS STEPS ---- */
.process-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
  counter-reset: process-counter;
}
.process-step {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  position: relative;
  counter-increment: process-counter;
  transition: all 0.3s;
}
.process-step:hover { border-color: var(--border-strong); transform: translateY(-4px); }
.process-step::before {
  content: counter(process-counter, decimal-leading-zero);
  font-family: var(--font-display);
  font-size: 4rem;
  line-height: 1;
  color: var(--accent);
  opacity: 0.15;
  position: absolute;
  top: 16px; right: 20px;
}
.process-step-title {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-family: var(--font-mono);
  margin-bottom: 10px;
}
.process-step-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* ---- PAGE HERO (inner pages) ---- */
.page-hero {
  padding: calc(var(--nav-h) + 72px) 40px 80px;
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--border);
}
.page-hero-bg {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 60px 60px;
  opacity: 0.4;
  mask-image: linear-gradient(to bottom, transparent, black 30%, black 70%, transparent);
  -webkit-mask-image: linear-gradient(to bottom, transparent, black 30%, black 70%, transparent);
}
.page-hero-accent {
  position: absolute;
  width: 500px; height: 500px;
  background: radial-gradient(circle, rgba(179,255,63,0.1), transparent 70%);
  filter: blur(80px);
  right: -100px; top: -100px;
  pointer-events: none;
}
.page-hero-chapter {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 16px;
  position: relative;
}
.page-hero-title {
  font-family: var(--font-display);
  font-size: clamp(3rem, 8vw, 7rem);
  line-height: 0.92;
  letter-spacing: 0.02em;
  margin-bottom: 24px;
  position: relative;
}
.page-hero-title span { color: var(--accent); }
.page-hero-desc {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 580px;
  line-height: 1.75;
  position: relative;
}

/* ---- FOOTER ---- */
footer {
  border-top: 1px solid var(--border);
  padding: 60px 40px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
}
.footer-brand {
  font-family: var(--font-display);
  font-size: 2rem;
  letter-spacing: 0.05em;
  margin-bottom: 12px;
}
.footer-brand span { color: var(--accent); }
.footer-copy {
  font-size: 0.82rem;
  color: var(--text-dim);
  line-height: 1.6;
}
.footer-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
  align-items: flex-end;
}
.footer-links a {
  font-size: 0.82rem;
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.2s;
  font-family: var(--font-mono);
  letter-spacing: 0.08em;
}
.footer-links a:hover { color: var(--accent); }

/* ---- REVEAL ANIMATIONS ---- */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s var(--ease-out-expo), transform 0.8s var(--ease-out-expo);
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}
.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

@keyframes fade-up {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes fade-in {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* ---- HOME — CHAPTERS OVERVIEW ---- */
.chapters-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 16px;
}
.chapter-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 36px;
  text-decoration: none;
  color: var(--text);
  display: flex;
  flex-direction: column;
  gap: 16px;
  transition: all 0.35s var(--ease-out-expo);
  position: relative;
  overflow: hidden;
  min-height: 240px;
}
.chapter-card::after {
  content: '→';
  position: absolute;
  bottom: 28px; right: 28px;
  font-size: 1.4rem;
  color: var(--text-dim);
  transition: all 0.3s var(--ease-out-expo);
}
.chapter-card:hover {
  border-color: var(--border-strong);
  transform: translateY(-6px);
  box-shadow: 0 32px 64px rgba(0,0,0,0.5);
}
.chapter-card:hover::after { color: var(--accent); transform: translate(4px, -4px); }
.chapter-card-num {
  font-family: var(--font-display);
  font-size: 6rem;
  line-height: 1;
  color: var(--text-dim);
  position: absolute;
  top: 16px; right: 16px;
  opacity: 0.1;
}
.chapter-card-label {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
}
.chapter-card-title {
  font-family: var(--font-display);
  font-size: 1.8rem;
  letter-spacing: 0.03em;
  line-height: 1.1;
}
.chapter-card-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.65;
  flex: 1;
}

/* ---- 4I GRID ---- */
.four-i-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}
.four-i-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  position: relative;
  overflow: hidden;
  transition: all 0.3s;
}
.four-i-card:hover { border-color: var(--border-strong); transform: scale(1.01); }
.four-i-letter {
  font-family: var(--font-display);
  font-size: 5rem;
  line-height: 1;
  color: var(--accent);
  opacity: 0.12;
  margin-bottom: -8px;
}
.four-i-name {
  font-family: var(--font-display);
  font-size: 1.8rem;
  letter-spacing: 0.05em;
  margin-bottom: 12px;
}
.four-i-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* ---- CONTENT PROSE ---- */
.prose {
  max-width: 780px;
}
.prose h2 {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 3rem);
  letter-spacing: 0.03em;
  margin: 56px 0 20px;
  color: var(--text);
}
.prose h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin: 32px 0 12px;
  color: var(--text);
}
.prose p {
  font-size: 1rem;
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 20px;
}
.prose strong { color: var(--text); font-weight: 700; }
.prose em { color: var(--accent); font-style: normal; }

/* ---- STICKINESS 6 FACTORS ---- */
.factors-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}
.factor {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 24px 20px;
  text-align: center;
  transition: all 0.3s;
}
.factor:hover { border-color: var(--accent); background: var(--accent-dim); }
.factor-icon { font-size: 1.8rem; margin-bottom: 12px; }
.factor-name { font-weight: 700; font-size: 0.9rem; margin-bottom: 8px; color: var(--text); }
.factor-desc { font-size: 0.8rem; color: var(--text-muted); line-height: 1.5; }

/* ---- AMD CHARS ---- */
.amd-chars {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 12px;
  margin-top: 40px;
}
.amd-char {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 20px 24px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
}
.amd-char-dot {
  width: 8px; height: 8px;
  background: var(--accent);
  border-radius: 50%;
  flex-shrink: 0;
  margin-top: 7px;
}
.amd-char-text {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ---- HOME MARQUEE ---- */
.marquee-section {
  overflow: hidden;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 20px 0;
  background: var(--surface);
}
.marquee-track {
  display: flex;
  gap: 48px;
  animation: marquee 25s linear infinite;
  white-space: nowrap;
  width: max-content;
}
.marquee-track-rev {
  animation: marquee-rev 25s linear infinite;
}
.marquee-item {
  font-family: var(--font-display);
  font-size: 1.1rem;
  letter-spacing: 0.08em;
  color: var(--text-dim);
  display: flex;
  align-items: center;
  gap: 24px;
}
.marquee-item span { color: var(--accent); font-size: 0.8rem; }
@keyframes marquee {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}
@keyframes marquee-rev {
  from { transform: translateX(-50%); }
  to { transform: translateX(0); }
}

/* ---- HIGHLIGHT BAND ---- */
.highlight-band {
  background: var(--accent);
  color: var(--bg);
  padding: 80px 40px;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.highlight-band::before {
  content: '';
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    -45deg,
    transparent,
    transparent 10px,
    rgba(0,0,0,0.03) 10px,
    rgba(0,0,0,0.03) 20px
  );
}
.highlight-band-text {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 4.5rem);
  letter-spacing: 0.02em;
  line-height: 1;
  position: relative;
  max-width: 900px;
  margin: 0 auto 24px;
}
.highlight-band-sub {
  font-size: 1rem;
  opacity: 0.7;
  position: relative;
  max-width: 500px;
  margin: 0 auto;
  line-height: 1.6;
}

/* ---- COOKIE CONSENT ---- */
.cookie-banner {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(140px);
  z-index: 9000;
  width: min(720px, calc(100vw - 32px));
  background: var(--surface);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-xl);
  padding: 24px 28px;
  box-shadow: 0 24px 80px rgba(0,0,0,0.6), 0 0 0 1px rgba(179,255,63,0.08);
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
  transition: transform 0.5s var(--ease-out-expo), opacity 0.5s;
  opacity: 0;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}
.cookie-banner.visible {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}
.cookie-banner.hiding {
  transform: translateX(-50%) translateY(140px);
  opacity: 0;
}
.cookie-icon {
  font-size: 1.6rem;
  flex-shrink: 0;
}
.cookie-text {
  flex: 1;
  min-width: 200px;
}
.cookie-text strong {
  display: block;
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 4px;
}
.cookie-text p {
  font-size: 0.78rem;
  color: var(--text-muted);
  line-height: 1.55;
  margin: 0;
}
.cookie-text a { color: var(--accent); text-decoration: none; }
.cookie-text a:hover { text-decoration: underline; }
.cookie-actions {
  display: flex;
  gap: 8px;
  flex-shrink: 0;
  flex-wrap: wrap;
}

/* ---- COOKIE SETTINGS MODAL ---- */
.cookie-modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 10000;
  background: rgba(0,0,0,0.7);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  z-index: 9100;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding: 0 16px 24px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.35s;
}
.cookie-modal-overlay.open {
  opacity: 1;
  pointer-events: all;
}
.cookie-modal {
  background: var(--surface);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-xl);
  width: min(600px, 100%);
  box-shadow: 0 32px 100px rgba(0,0,0,0.7);
  transform: translateY(40px);
  transition: transform 0.4s var(--ease-out-expo);
  overflow: hidden;
}
.cookie-modal-overlay.open .cookie-modal {
  transform: translateY(0);
}
.cookie-modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 22px 28px 18px;
  border-bottom: 1px solid var(--border);
}
.cookie-modal-header h2 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
}
.cookie-modal-close {
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  color: var(--text-muted);
  width: 32px; height: 32px;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
  font-size: 0.9rem;
  transition: all 0.2s;
}
.cookie-modal-close:hover { border-color: var(--accent); color: var(--accent); }
.cookie-modal-body { padding: 8px 0; }
.cookie-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 20px 28px;
  border-bottom: 1px solid var(--border);
}
.cookie-row:last-child { border-bottom: none; }
.cookie-row-info strong {
  display: block;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 4px;
}
.cookie-row-info p {
  font-size: 0.78rem;
  color: var(--text-muted);
  line-height: 1.55;
  margin: 0;
}
.cookie-always-on {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  color: var(--accent);
  text-transform: uppercase;
  white-space: nowrap;
  flex-shrink: 0;
}
/* Toggle switch */
.cookie-toggle-wrap { flex-shrink: 0; }
.cookie-toggle-disabled { opacity: 0.5; cursor: not-allowed; pointer-events: none; }
.cookie-toggle {
  position: relative;
  display: inline-block;
  width: 46px; height: 26px;
  flex-shrink: 0;
  cursor: pointer;
}
.cookie-toggle input { opacity: 0; width: 0; height: 0; }
.cookie-toggle-slider {
  position: absolute;
  inset: 0;
  background: var(--surface-2);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-full);
  transition: all 0.3s;
}
.cookie-toggle-slider::before {
  content: '';
  position: absolute;
  width: 18px; height: 18px;
  left: 3px; top: 3px;
  background: var(--text-muted);
  border-radius: 50%;
  transition: all 0.3s var(--ease-out-expo);
}
.cookie-toggle input:checked + .cookie-toggle-slider {
  background: var(--accent-dim);
  border-color: rgba(179,255,63,0.4);
}
.cookie-toggle input:checked + .cookie-toggle-slider::before {
  transform: translateX(20px);
  background: var(--accent);
}
.cookie-modal-footer {
  display: flex;
  gap: 10px;
  padding: 20px 28px;
  border-top: 1px solid var(--border);
  justify-content: flex-end;
}

@media (max-width: 600px) {
  .cookie-banner { bottom: 16px; padding: 20px; flex-direction: column; align-items: flex-start; }
  .cookie-actions { width: 100%; }
  .cookie-actions .btn { flex: 1; justify-content: center; }
  .cookie-modal-footer { flex-direction: column; }
  .cookie-modal-footer .btn { width: 100%; justify-content: center; }
}

/* ---- RESPONSIVE ---- */
@media (max-width: 1024px) {
  .bento-3 { grid-template-columns: repeat(2, 1fr); }
  .bento-4 { grid-template-columns: repeat(2, 1fr); }
  .four-i-grid { grid-template-columns: 1fr; }
  .factors-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  nav { padding: 0 20px; }
  section { padding: 64px 20px; }
  .hero { padding: calc(var(--nav-h) + 40px) 20px 64px; }
  .page-hero { padding: calc(var(--nav-h) + 56px) 20px 60px; }
  .bento-2, .bento-3, .bento-4 { grid-template-columns: 1fr; }
  .bento-span-2, .bento-span-3 { grid-column: span 1; }
  .principle { grid-template-columns: 1fr; }
  .principle-num { font-size: 2rem; }
  .four-i-grid { grid-template-columns: 1fr; }
  .factors-grid { grid-template-columns: 1fr; }
  .definition-box { padding: 32px 24px; }
  footer { grid-template-columns: 1fr; }
  .footer-links { align-items: flex-start; }
  .quote-block { padding: 28px 24px; }
  .cursor, .cursor-follower { display: none; }
  body { cursor: auto; }
}