:root {
  --bg: #f4f1ec;
  --surface: rgba(255, 253, 249, 0.72);
  --surface-hover: rgba(255, 253, 249, 0.92);
  --dark: #1a1714;
  --dark-surface: #1e1b17;
  --text: #1e1812;
  --muted: #6b5d50;
  --faint: #a09586;
  --line: rgba(60, 40, 20, 0.1);
  --accent: #b06830;
  --accent-hover: #964f1c;
  --radius: 16px;
  --radius-sm: 10px;
  --max-w: 1080px;
  --font: 'DM Sans', -apple-system, sans-serif;
  --mono: 'JetBrains Mono', monospace;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  color: var(--text);
  background-color: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    linear-gradient(180deg, rgba(244,241,236,0.35) 0%, rgba(244,241,236,0.92) 60%, rgba(244,241,236,1) 100%),
    url("./assets/background.jpg") center top / cover no-repeat;
  transform: scaleX(-1);
}

.grain {
  position: fixed; inset: 0; pointer-events: none; z-index: 9999; opacity: 0.03;
  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)'/%3E%3C/svg%3E");
  background-size: 200px;
}

img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }

/* ─── TOPBAR ─── */
.topbar {
  max-width: var(--max-w); margin: 0 auto;
  padding: 24px 24px 0;
  display: flex; align-items: center; justify-content: space-between;
}
.brand {
  display: inline-flex; align-items: center;
  padding: 8px 16px; border-radius: 999px;
  background: rgba(255,253,249,0.65); border: 1px solid rgba(60,40,20,0.1);
  backdrop-filter: blur(10px);
}
.brand img { height: 58px; width: auto; }
.nav { display: flex; gap: 6px; align-items: center; }
.nav a {
  padding: 8px 16px; border-radius: 999px;
  font-size: 0.85rem; font-weight: 500; color: var(--muted);
  background: rgba(255,253,249,0.65); border: 1px solid rgba(60,40,20,0.1);
  transition: background 150ms, color 150ms;
}
.nav a:hover { background: rgba(255,253,249,0.95); color: var(--text); }
.nav-github, .nav-pypi { display: inline-flex !important; align-items: center; gap: 6px; }
.nav-github svg { flex-shrink: 0; }
.star-count, .download-count { font-size: 0.78rem; opacity: 0.7; }

/* ─── LAYOUT ─── */
main { max-width: var(--max-w); margin: 0 auto; padding: 0 24px 40px; }
main > section { margin-bottom: 22px; }

/* ─── CARDS ─── */
.card {
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 28px; backdrop-filter: blur(12px);
}

/* ─── KICKER ─── */
.kicker {
  display: block; font-size: 0.72rem; font-weight: 600;
  letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--faint); margin-bottom: 10px;
}

/* ─── HERO ─── */
.hero {
  padding: 80px 0 40px; text-align: center;
  display: flex; flex-direction: column; align-items: center;
}
.hero-badges {
  display: flex; gap: 8px; margin-bottom: 24px;
  flex-wrap: wrap; justify-content: center;
}
.hero-badge {
  padding: 6px 14px; border-radius: 999px;
  font-size: 0.76rem; font-weight: 600; letter-spacing: 0.06em;
  color: var(--muted);
  background: rgba(255,253,249,0.75); border: 1px solid rgba(60,40,20,0.12);
  backdrop-filter: blur(8px);
}
h1 {
  font-size: clamp(2.6rem, 6vw, 4.4rem);
  font-weight: 800; letter-spacing: -0.045em;
  line-height: 0.95; max-width: 14ch;
}
.hero-sub {
  margin-top: 22px; max-width: 52ch;
  font-size: 1.3rem; font-weight: 600;
  letter-spacing: -0.02em; color: var(--muted); line-height: 1.45;
}
.hero-actions {
  margin-top: 36px; display: flex; align-items: center;
  gap: 14px; flex-wrap: wrap; justify-content: center;
}
.install-pill {
  padding: 12px 20px; border-radius: 999px;
  background: var(--dark); color: #e8dfd4;
  font-family: var(--mono); font-size: 0.88rem; font-weight: 500;
  user-select: all; cursor: text;
}
.btn {
  display: inline-flex; align-items: center; height: 46px;
  padding: 0 22px; border-radius: 999px;
  font-weight: 700; font-size: 0.92rem;
  transition: transform 150ms, background 150ms;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-hover); }

/* ─── VAULT PRIMITIVE ─── */
.vault-card {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 40px;
  align-items: center;
}

.vault-3d-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  perspective: 600px;
}

.vault-scene {
  width: 160px;
  height: 160px;
}

.vault-cube {
  width: 100%;
  height: 100%;
  position: relative;
  transform-style: preserve-3d;
  animation: vault-spin 18s linear infinite;
}

@keyframes vault-spin {
  from { transform: rotateX(-15deg) rotateY(0deg); }
  to   { transform: rotateX(-15deg) rotateY(360deg); }
}

.vault-face {
  position: absolute;
  width: 160px;
  height: 160px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1.5px solid rgba(176, 104, 48, 0.2);
  border-radius: 12px;
  background: rgba(255, 253, 249, 0.55);
  backdrop-filter: blur(4px);
  color: var(--accent);
}

.vault-face svg {
  width: 40px;
  height: 40px;
  opacity: 0.5;
}

.vault-front  { transform: translateZ(80px); }
.vault-back   { transform: rotateY(180deg) translateZ(80px); }
.vault-right  { transform: rotateY(90deg) translateZ(80px); }
.vault-left   { transform: rotateY(-90deg) translateZ(80px); }
.vault-top    { transform: rotateX(90deg) translateZ(80px); background: rgba(255,253,249,0.3); }
.vault-bottom { transform: rotateX(-90deg) translateZ(80px); background: rgba(255,253,249,0.3); }

.vault-info h2 {
  font-size: 1.6rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  margin-bottom: 6px;
}

.vault-lead {
  color: var(--muted);
  font-size: 1rem;
  margin-bottom: 20px;
}

.vault-props {
  list-style: none;
  padding: 0;
  display: grid;
  gap: 12px;
}

.vault-props li {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.94rem;
  color: var(--text);
}

.prop-icon {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  background: rgba(176, 104, 48, 0.08);
  color: var(--accent);
  flex-shrink: 0;
}

.prop-icon svg {
  width: 18px;
  height: 18px;
}

/* ─── SCHEMA SECTIONS ─── */
.schema-section { display: grid; gap: 18px; }
.schema-text { max-width: none; width: 100%; }
.schema-text .kicker { margin-bottom: 8px; }
.schema-text h2 {
  font-size: 1.5rem; font-weight: 700;
  letter-spacing: -0.03em; line-height: 1.2; margin-bottom: 10px;
}
.schema-text p { color: var(--muted); font-size: 0.95rem; line-height: 1.7; }
.schema-text a {
  color: var(--accent); text-decoration: underline;
  text-decoration-color: rgba(176,104,48,0.3);
  text-underline-offset: 3px; transition: text-decoration-color 150ms;
}
.schema-text a:hover { text-decoration-color: var(--accent); }
.schema-frame {
  margin: 0; padding: 20px;
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); backdrop-filter: blur(12px);
  display: grid; gap: 18px;
}
.schema-frame img { width: 100%; border-radius: var(--radius-sm); }

/* ─── SECTION TITLES ─── */
.section-title {
  font-size: 1.6rem; font-weight: 700;
  letter-spacing: -0.035em; margin-bottom: 22px;
}

/* ─── PRINCIPLES ─── */
.principle-list { display: grid; gap: 6px; }
.principle-row {
  display: grid; grid-template-columns: 64px 1fr; gap: 20px;
  align-items: start; padding: 22px 24px;
  border-radius: var(--radius);
  background: var(--surface); border: 1px solid var(--line);
  backdrop-filter: blur(12px);
  transition: transform 180ms ease, border-color 180ms ease;
}
.principle-row:hover { transform: translateY(-1px); border-color: rgba(176,104,48,0.18); }
.principle-icon {
  width: 48px; height: 48px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 12px; background: rgba(176,104,48,0.08);
  color: var(--accent); flex-shrink: 0; margin-top: 2px;
}
.principle-icon svg { width: 28px; height: 28px; }

.principle-row h3 {
  font-size: 1.02rem; font-weight: 700;
  letter-spacing: -0.02em; margin-bottom: 4px;
}
.principle-row p { color: var(--muted); font-size: 0.92rem; line-height: 1.7; }

/* ─── INTERFACES ─── */
.interface-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.interface-card {
  display: grid; gap: 10px; align-content: start;
  transition: transform 180ms ease, border-color 180ms ease;
}
.interface-card:hover { transform: translateY(-1px); border-color: rgba(176,104,48,0.18); }
.interface-badge {
  display: inline-flex; width: fit-content;
  padding: 6px 12px; border-radius: 999px;
  font-family: var(--mono); font-size: 0.72rem; font-weight: 600;
  letter-spacing: 0.1em; text-transform: uppercase;
  background: rgba(176,104,48,0.1); color: var(--accent);
}
.interface-card h3 { font-size: 1.1rem; font-weight: 700; letter-spacing: -0.02em; }
.interface-card p { color: var(--muted); font-size: 0.92rem; line-height: 1.7; }

/* ─── COMPARISON ─── */
.comparison .table-wrap { padding: 4px; overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 0.9rem; min-width: 640px; }
th, td { padding: 13px 16px; text-align: left; border-bottom: 1px solid var(--line); }
th { font-size: 0.72rem; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; color: var(--faint); }
tbody tr:last-child td { border-bottom: 0; }
td.yes { font-weight: 700; color: var(--accent); }

/* ─── QUICKSTART ─── */
.code-card { padding: 0; overflow: hidden; }
.code-tabs {
  display: flex; border-bottom: 1px solid var(--line);
  background: rgba(255,253,249,0.9);
}
.code-tab {
  padding: 14px 20px; border: none; background: none;
  font-family: var(--font); font-size: 0.82rem; font-weight: 600;
  letter-spacing: 0.06em; text-transform: uppercase;
  color: var(--faint); cursor: pointer;
  position: relative; transition: color 150ms;
}
.code-tab:hover { color: var(--text); }
.code-tab.active { color: var(--text); }
.code-tab.active::after {
  content: ''; position: absolute;
  bottom: -1px; left: 16px; right: 16px;
  height: 2px; background: var(--accent); border-radius: 2px;
}
.code-block {
  margin: 0; padding: 24px;
  background: var(--dark-surface); color: #ede5db;
  font-family: var(--mono); font-size: 0.88rem; line-height: 1.75;
  overflow-x: auto;
}
.code-block.hidden { display: none; }
.t-kw { color: #f3a7a0; font-weight: 600; }
.t-mod, .t-cls { color: #8bd3dd; }
.t-str { color: #a8d8ae; }
.t-fn { color: #f7c784; }
.t-var { color: #d9cec2; }
.t-cmt { color: #6e6259; }

/* ─── EXAMPLES ─── */
.example-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; }
.example {
  display: grid; gap: 6px; align-content: start;
  position: relative; padding-left: 32px;
  transition: transform 150ms, border-color 150ms, background 150ms;
}
.example::before {
  content: ''; position: absolute;
  left: 0; top: 12px; bottom: 12px; width: 3px;
  border-radius: 999px; background: var(--accent-dot, var(--faint));
}
.example:hover {
  transform: translateY(-2px);
  border-color: rgba(176,104,48,0.25); background: var(--surface-hover);
}
.example-num { font-family: var(--mono); font-size: 0.72rem; font-weight: 600; color: var(--faint); letter-spacing: 0.08em; }
.example strong { font-size: 1.02rem; letter-spacing: -0.02em; }
.example p { font-size: 0.88rem; color: var(--muted); line-height: 1.6; }

/* ─── FOOTER ─── */
.footer {
  max-width: var(--max-w); margin: 0 auto 32px; padding: 20px 24px;
  display: flex; align-items: center; justify-content: space-between;
  gap: 18px 24px; flex-wrap: wrap; font-size: 0.85rem; color: var(--muted);
}
.footer-left { display: flex; align-items: center; gap: 12px; flex: 1 1 360px; min-width: 0; }
.footer-brand {
  display: inline-flex; align-items: center;
  padding: 6px 12px; border-radius: 999px;
  background: rgba(255,253,249,0.65); border: 1px solid rgba(60,40,20,0.1);
  backdrop-filter: blur(10px); flex-shrink: 0;
}
.footer-brand img { height: 32px; width: auto; display: block; }
.footer-tagline { display: block; flex: 1 1 auto; text-align: center; color: var(--muted); line-height: 1.4; }
.footer-right { display: flex; align-items: center; justify-content: flex-end; gap: 6px; flex: 1 1 320px; flex-wrap: wrap; }
.footer-right a { padding: 6px 12px; border-radius: 999px; border: 1px solid var(--line); font-weight: 500; transition: background 150ms; }
.footer-right a:hover { background: rgba(0,0,0,0.04); }
.footer-right span { padding: 6px 12px; color: var(--faint); }

/* ─── REVEAL ─── */
.reveal { opacity: 0; transform: translateY(16px); transition: opacity 600ms ease, transform 600ms ease; }
.reveal.is-visible { opacity: 1; transform: translateY(0); }

/* ─── RESPONSIVE ─── */
@media (max-width: 860px) {
  .vault-card { grid-template-columns: 1fr; gap: 24px; justify-items: center; }
  .vault-info { text-align: left; width: 100%; }
  .interface-grid, .example-grid { grid-template-columns: 1fr; }
  .hero { padding: 48px 0 24px; }
  h1 { font-size: clamp(2.2rem, 8vw, 3.2rem); }
  .hero-sub { font-size: 1.1rem; }
  .principle-row { grid-template-columns: 52px 1fr; gap: 14px; padding: 18px 20px; }
}

@media (max-width: 640px) {
  .topbar { flex-direction: column; align-items: flex-start; gap: 12px; }
  .nav { flex-wrap: wrap; }
  .hero-actions { flex-direction: column; align-items: stretch; }
  .install-pill, .btn { text-align: center; justify-content: center; }
  .footer { align-items: stretch; }
  .footer-left, .footer-right { flex: 1 1 100%; justify-content: flex-start; }
  .footer-tagline { text-align: left; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .vault-cube { animation: none; transform: rotateX(-15deg) rotateY(-30deg); }
}