/* ============================================
   Layout, nav, hero, chapters, cards, footer
   ============================================ */

.container {
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

/* ---- Global ambient scene ---- */
.scene-bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}
.scene-bg canvas { position: absolute; inset: 0; width: 100%; height: 100%; }
.scene-grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse at center, #000 20%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse at center, #000 20%, transparent 75%);
}
.scene-gradient {
  position: absolute; inset: 0;
  background:
    radial-gradient(600px 400px at 15% 20%, color-mix(in oklch, var(--violet) 22%, transparent), transparent 60%),
    radial-gradient(700px 500px at 85% 80%, color-mix(in oklch, var(--lime) 18%, transparent), transparent 60%);
  opacity: 0.85;
  transition: opacity 600ms;
}
main { position: relative; z-index: 1; }

/* ---- Scroll progress ---- */
.scroll-rail {
  position: fixed;
  left: 0; top: 0; right: 0;
  height: 3px;
  z-index: 100;
  pointer-events: none;
}
.scroll-rail::before {
  content: "";
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: var(--sp, 0%);
  background: linear-gradient(90deg, var(--lime), var(--violet));
  box-shadow: 0 0 20px color-mix(in oklch, var(--lime) 60%, transparent);
}

/* ---- Navbar ---- */
.nav {
  position: fixed;
  top: 1rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 90;
  padding: 0.6rem 0.8rem 0.6rem 1.1rem;
  background: var(--glass);
  backdrop-filter: blur(24px) saturate(1.3);
  -webkit-backdrop-filter: blur(24px) saturate(1.3);
  border: 1px solid var(--line);
  border-radius: 999px;
  box-shadow: var(--shadow);
  display: flex; align-items: center; gap: 0.4rem;
  max-width: calc(100vw - 2rem);
}
.nav-logo {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--fg-0);
  padding: 0 0.75rem 0 0.4rem;
  display: flex; align-items: center; gap: 0.5rem;
  white-space: nowrap;
}
.nav-logo::before {
  content: "";
  width: 10px; height: 10px; border-radius: 2px;
  background: conic-gradient(from 0deg, var(--lime), var(--violet), var(--lime));
  box-shadow: 0 0 12px color-mix(in oklch, var(--lime) 60%, transparent);
  animation: spin 6s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.nav-links { display: flex; gap: 0.15rem; }
.nav-link {
  font-size: 0.82rem;
  font-weight: 500;
  padding: 0.5rem 0.85rem;
  border-radius: 999px;
  color: var(--fg-1);
  position: relative;
  transition: color 220ms var(--e-out), background 220ms var(--e-out);
}
.nav-link:hover { color: var(--fg-0); background: var(--glass-hi); }
.nav-link.active { color: var(--bg-ink); background: var(--lime); }
.nav-tools { display: flex; gap: 0.3rem; padding-left: 0.4rem; border-left: 1px solid var(--line-soft); margin-left: 0.2rem; }
.icon-btn {
  width: 34px; height: 34px;
  display: inline-flex; align-items: center; justify-content: center;
  border-radius: 999px;
  color: var(--fg-1);
  transition: background 200ms var(--e-out), color 200ms var(--e-out), transform 300ms var(--e-spring);
}
.icon-btn:hover { background: var(--glass-hi); color: var(--fg-0); transform: rotate(12deg); }
.icon-btn svg { width: 16px; height: 16px; }
.lang-btn { font-size: 0.65rem; font-weight: 700; letter-spacing: 0.06em; }
.lang-btn:hover { transform: none; }

.hamburger { display: none; }

/* ---- Hero ---- */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  padding: 8rem 0 6rem;
}
.hero-inner {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: clamp(2rem, 5vw, 5rem);
  align-items: center;
}
.eyebrow {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--fg-2);
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.45rem 0.9rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--glass);
  backdrop-filter: blur(10px);
}
.eyebrow .pulse {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--lime);
  box-shadow: 0 0 0 0 color-mix(in oklch, var(--lime) 60%, transparent);
  animation: pulse 1.8s ease-out infinite;
}
@keyframes pulse {
  0% { box-shadow: 0 0 0 0 color-mix(in oklch, var(--lime) 70%, transparent); }
  100% { box-shadow: 0 0 0 14px transparent; }
}

.hero-title {
  font-family: var(--font-display);
  font-size: var(--fs-mega);
  line-height: var(--lh-tight);
  letter-spacing: -0.035em;
  font-weight: 500;
  margin: 1.2rem 0 1.4rem;
  color: var(--fg-0);
}
.hero-title .accent {
  background: linear-gradient(135deg, var(--lime) 0%, var(--violet) 100%);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
  font-style: italic;
  font-family: var(--font-display);
}
.hero-title .char { display: inline-block; transform: translateY(100%); opacity: 0; }
.hero-title.in .char {
  animation: charIn 900ms var(--e-out) forwards;
  animation-delay: calc(var(--i, 0) * 25ms);
}
@keyframes charIn { to { transform: translateY(0); opacity: 1; } }

.hero-role {
  font-family: var(--font-mono);
  font-size: clamp(0.95rem, 1.2vw, 1.1rem);
  color: var(--fg-1);
  margin-bottom: 1.2rem;
}
.hero-role .prefix { color: var(--fg-3); }
.hero-role .typed { color: var(--lime); }
.hero-role .caret {
  display: inline-block; width: 8px; height: 1.05em;
  background: var(--lime);
  vertical-align: -2px;
  margin-left: 2px;
  animation: blink 1s steps(1) infinite;
}
@keyframes blink { 50% { opacity: 0; } }

.hero-desc {
  max-width: 52ch;
  color: var(--fg-2);
  font-size: clamp(1rem, 1.15vw, 1.12rem);
  line-height: 1.65;
  margin-bottom: 2rem;
}

.hero-stats {
  display: flex;
  gap: clamp(1rem, 3vw, 2.5rem);
  margin-bottom: 2.4rem;
  flex-wrap: wrap;
}
.hero-stats > div { position: relative; padding-left: 1rem; }
.hero-stats > div::before {
  content: ""; position: absolute; left: 0; top: 0.3em; bottom: 0.3em;
  width: 2px; border-radius: 2px;
  background: linear-gradient(var(--lime), var(--violet));
}
.stat-num {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 2.8vw, 2.6rem);
  font-weight: 600;
  color: var(--fg-0);
  letter-spacing: -0.02em;
  line-height: 1;
}
.stat-num .plus { color: var(--lime); font-size: 0.7em; vertical-align: super; }
.stat-lbl {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--fg-3);
  margin-top: 0.35rem;
  display: block;
}

.hero-cta { display: flex; flex-wrap: wrap; gap: 0.8rem; }
.btn {
  display: inline-flex; align-items: center; gap: 0.55rem;
  padding: 0.95rem 1.5rem;
  border-radius: 999px;
  font-weight: 500;
  font-size: 0.92rem;
  border: 1px solid var(--line);
  transition: transform 250ms var(--e-spring), background 200ms, color 200ms, border-color 200ms;
  position: relative; overflow: hidden;
  white-space: nowrap;
}
.btn-primary { background: var(--fg-0); color: var(--bg-ink); border-color: var(--fg-0); }
.btn-primary:hover { transform: translateY(-2px); }
.btn-primary::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(135deg, var(--lime), var(--violet));
  opacity: 0; transition: opacity 300ms;
  z-index: -1;
}
.btn-primary:hover { background: transparent; color: var(--bg-ink); border-color: var(--lime); }
.btn-primary:hover::after { opacity: 1; }
.btn-ghost { background: var(--glass); color: var(--fg-0); backdrop-filter: blur(14px); }
.btn-ghost:hover { background: var(--glass-hi); border-color: var(--fg-2); }

/* Hero visual — 3D stacked memory cards */
.hero-visual {
  position: relative;
  perspective: 1400px;
  aspect-ratio: 1 / 1.1;
  max-width: 520px;
  margin-left: auto;
  width: 100%;
}
.orbit-stage {
  position: absolute; inset: 0;
  transform-style: preserve-3d;
  transform: rotateX(18deg) rotateY(-20deg);
  animation: orbitFloat 12s ease-in-out infinite alternate;
}
@keyframes orbitFloat {
  0%   { transform: rotateX(18deg) rotateY(-22deg); }
  100% { transform: rotateX(22deg) rotateY(-12deg); }
}
.portrait-ring {
  position: absolute;
  left: 50%; top: 50%;
  width: 58%;
  aspect-ratio: 1;
  transform: translate(-50%, -50%);
  border-radius: 50%;
  transform-style: preserve-3d;
}
.portrait-ring img {
  width: 100%; height: 100%; object-fit: cover;
  border-radius: 50%;
  border: 2px solid var(--line);
  filter: contrast(1.05) saturate(0.9);
  background: var(--bg-2);
}
.portrait-ring::before {
  content: "";
  position: absolute; inset: -14px;
  border-radius: 50%;
  border: 1px dashed var(--line);
  animation: spin 22s linear infinite;
}
.portrait-ring::after {
  content: "";
  position: absolute; inset: -36px;
  border-radius: 50%;
  background: conic-gradient(from 0deg, transparent 0 60%, var(--lime) 62% 68%, transparent 70%, var(--violet) 80% 86%, transparent 88%);
  opacity: 0.7;
  animation: spin 18s linear infinite reverse;
  filter: blur(0.5px);
  z-index: -1;
}

.orbit-card {
  position: absolute;
  padding: 0.7rem 0.9rem;
  background: var(--glass-hi);
  backdrop-filter: blur(20px);
  border: 1px solid var(--line);
  border-radius: 14px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--fg-0);
  box-shadow: var(--shadow);
  white-space: nowrap;
  animation: floatCard 6s ease-in-out infinite;
  transform-style: preserve-3d;
}
.orbit-card .dot {
  display: inline-block; width: 6px; height: 6px; border-radius: 50%;
  background: var(--lime); margin-right: 6px; vertical-align: middle;
}
.orbit-card.violet .dot { background: var(--violet); }
.orbit-card.coral  .dot { background: var(--coral); }

.orbit-card:nth-child(1) { top: 4%;   left: -4%;  transform: translateZ(40px);  animation-delay: 0s; }
.orbit-card:nth-child(2) { top: 18%;  right: -2%; transform: translateZ(60px);  animation-delay: 0.6s; }
.orbit-card:nth-child(3) { bottom: 20%; left: -8%; transform: translateZ(50px); animation-delay: 1.2s; }
.orbit-card:nth-child(4) { bottom: 6%; right: 2%;  transform: translateZ(30px); animation-delay: 1.8s; }
.orbit-card:nth-child(5) { top: 48%;  left: -14%; transform: translateZ(70px);  animation-delay: 2.4s; }
.orbit-card:nth-child(6) { top: 40%;  right: -12%; transform: translateZ(65px); animation-delay: 3s; }

@keyframes floatCard {
  0%, 100% { transform: translateZ(var(--z, 40px)) translateY(0); }
  50%      { transform: translateZ(var(--z, 40px)) translateY(-10px); }
}

.hero-scroll {
  position: absolute;
  bottom: 2rem; left: 50%;
  transform: translateX(-50%);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--fg-3);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  display: flex; flex-direction: column; align-items: center; gap: 0.6rem;
}
.hero-scroll .line-anim {
  width: 1px; height: 46px;
  background: linear-gradient(var(--lime), transparent);
  animation: scrollLine 2.2s ease-in-out infinite;
  transform-origin: top;
}
@keyframes scrollLine {
  0% { transform: scaleY(0); }
  50% { transform: scaleY(1); }
  100% { transform: scaleY(0); transform-origin: bottom; }
}

/* ---- Section heading ---- */
.sec {
  position: relative;
  padding: clamp(5rem, 10vw, 9rem) 0;
}
.sec-head {
  display: flex; justify-content: space-between; align-items: flex-end;
  margin-bottom: 3.5rem;
  gap: 2rem; flex-wrap: wrap;
}
.sec-num {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--fg-3);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  display: flex; align-items: center; gap: 0.6rem;
}
.sec-num::before {
  content: ""; width: 28px; height: 1px; background: var(--lime);
}
.sec-title {
  font-family: var(--font-display);
  font-size: var(--fs-h1);
  line-height: 1.05;
  letter-spacing: -0.025em;
  font-weight: 500;
  color: var(--fg-0);
  margin: 0.6rem 0 0;
  max-width: 18ch;
}
.sec-title em {
  font-style: italic;
  background: linear-gradient(135deg, var(--lime), var(--violet));
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}
.sec-kicker {
  max-width: 38ch;
  color: var(--fg-2);
  font-size: 1rem;
  line-height: 1.65;
}

/* Reveal util */
.reveal { opacity: 0; transform: translateY(32px); transition: opacity 800ms var(--e-out), transform 800ms var(--e-out); }
.reveal.in { opacity: 1; transform: translateY(0); }
.reveal[data-d="1"] { transition-delay: 80ms; }
.reveal[data-d="2"] { transition-delay: 160ms; }
.reveal[data-d="3"] { transition-delay: 240ms; }
.reveal[data-d="4"] { transition-delay: 320ms; }
.reveal[data-d="5"] { transition-delay: 400ms; }

/* ---- Tweaks panel ---- */
.tweak-panel {
  position: fixed;
  right: 1.25rem;
  bottom: 1.25rem;
  width: 260px;
  background: var(--glass-hi);
  backdrop-filter: blur(24px) saturate(1.3);
  border: 1px solid var(--line);
  border-radius: 18px;
  box-shadow: var(--shadow-lg);
  padding: 1rem 1.1rem;
  font-size: 0.8rem;
  z-index: 95;
  transform: translateY(calc(100% + 2rem));
  transition: transform 500ms var(--e-spring);
}
.tweak-panel.on { transform: translateY(0); }
.tweak-panel h4 {
  margin: 0 0 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--fg-3);
}
.tweak-row { display: flex; justify-content: space-between; align-items: center; padding: 0.4rem 0; gap: 0.6rem; }
.tweak-row label { color: var(--fg-1); font-size: 0.82rem; }
.tweak-seg {
  display: inline-flex; border: 1px solid var(--line); border-radius: 8px; overflow: hidden;
}
.tweak-seg button {
  padding: 0.3rem 0.55rem; font-size: 0.72rem; color: var(--fg-2);
  background: transparent;
}
.tweak-seg button.on { background: var(--lime); color: var(--bg-ink); }

/* ---- Footer ---- */
footer {
  padding: 4rem 0 2rem;
  border-top: 1px solid var(--line);
  margin-top: 6rem;
}
.foot-top {
  display: grid;
  grid-template-columns: 1.4fr repeat(3, 1fr);
  gap: 3rem;
  margin-bottom: 3rem;
}
.foot-col h5 {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--fg-3);
  margin: 0 0 1rem;
}
.foot-col a {
  display: block; padding: 0.3rem 0;
  color: var(--fg-1); font-size: 0.92rem;
  transition: color 200ms, transform 300ms var(--e-spring);
}
.foot-col a:hover { color: var(--lime); transform: translateX(4px); }
.foot-sig {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 8vw, 6rem);
  font-weight: 500;
  line-height: 0.9;
  letter-spacing: -0.03em;
  color: var(--fg-0);
  margin: 0;
}
.foot-sig em { font-style: italic; background: linear-gradient(135deg, var(--lime), var(--violet)); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.foot-bottom {
  display: flex; justify-content: space-between; align-items: center;
  padding-top: 2rem;
  border-top: 1px solid var(--line-soft);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--fg-3);
  letter-spacing: 0.1em;
  flex-wrap: wrap; gap: 1rem;
}

/* Cursor glow */
.cursor-glow {
  position: fixed;
  width: 400px; height: 400px;
  border-radius: 50%;
  pointer-events: none;
  z-index: 0;
  background: radial-gradient(circle, color-mix(in oklch, var(--lime) 18%, transparent) 0%, transparent 60%);
  transform: translate(-50%, -50%);
  transition: opacity 600ms;
  mix-blend-mode: screen;
}
[data-theme="light"] .cursor-glow { mix-blend-mode: multiply; opacity: 0.5; }

/* ============== RESPONSIVE ============== */
@media (max-width: 960px) {
  .nav-links { display: none; }
  .hamburger {
    display: inline-flex; align-items: center; justify-content: center;
    width: 34px; height: 34px; border-radius: 999px;
    background: transparent;
  }
  .hamburger svg { width: 18px; height: 18px; color: var(--fg-0); }
  .hero-inner { grid-template-columns: 1fr; }
  .hero-visual { order: -1; max-width: 340px; margin: 0 auto; }
  .foot-top { grid-template-columns: 1fr 1fr; gap: 2rem; }
}
@media (max-width: 560px) {
  .nav { top: 0.65rem; padding: 0.45rem 0.5rem 0.45rem 0.8rem; }
  .nav-logo { font-size: 0.75rem; padding-right: 0.4rem; }
  .hero { padding: 7rem 0 4rem; }
  .hero-stats { gap: 1.2rem; }
  .foot-top { grid-template-columns: 1fr; }
  .tweak-panel { left: 1rem; right: 1rem; width: auto; }
  .orbit-card { font-size: 0.66rem; padding: 0.5rem 0.7rem; }
}

/* Mobile sheet */
.mnav {
  position: fixed; inset: 0;
  background: var(--bg-0);
  z-index: 95;
  padding: 6rem 2rem 2rem;
  display: flex; flex-direction: column; gap: 0.5rem;
  opacity: 0; pointer-events: none;
  transition: opacity 300ms;
}
.mnav.on { opacity: 1; pointer-events: auto; }
.mnav a {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 500;
  padding: 0.6rem 0;
  border-bottom: 1px solid var(--line-soft);
  color: var(--fg-0);
}
.mnav a:hover { color: var(--lime); }