:root {
  --bg: #060607;
  --bg-soft: #0c0d10;
  --line: rgba(255, 255, 255, 0.09);
  --line-strong: rgba(255, 255, 255, 0.18);
  --text: #f4f4f2;
  --text-dim: #9a9a96;
  --text-faint: #6a6a67;
  --accent: #cfc6b4;
  --radius: 14px;
  --maxw: 1120px;
  --font: "Inter", "PingFang SC", "Microsoft YaHei", "Segoe UI", system-ui, sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }

.wrap {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 28px;
}

/* ---------- nav ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(14px);
  background: rgba(6, 6, 7, 0.72);
  border-bottom: 1px solid var(--line);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.brand svg { display: block; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  font-size: 14px;
  color: var(--text-dim);
}

.nav-links a:hover { color: var(--text); }

/* ---------- hero ---------- */
.hero {
  position: relative;
  padding: 118px 0 96px;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: -40% 20% auto -10%;
  height: 620px;
  background: radial-gradient(circle at 50% 50%, rgba(207, 198, 180, 0.13), transparent 62%);
  pointer-events: none;
}

.hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 64px;
  align-items: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 12px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  font-size: 12.5px;
  color: var(--text-dim);
  letter-spacing: 0.02em;
  margin-bottom: 26px;
}

.eyebrow .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #7ee08a;
  box-shadow: 0 0 10px rgba(126, 224, 138, 0.7);
}

h1 {
  margin: 0 0 22px;
  font-size: clamp(38px, 5vw, 62px);
  line-height: 1.1;
  letter-spacing: -0.035em;
  font-weight: 600;
}

h1 em {
  font-style: normal;
  color: var(--text-faint);
}

.lede {
  margin: 0 0 34px;
  max-width: 30em;
  color: var(--text-dim);
  font-size: 17px;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  height: 46px;
  padding: 0 22px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-size: 14.5px;
  font-weight: 500;
  cursor: pointer;
  transition: transform 0.18s ease, background 0.18s ease, border-color 0.18s ease;
}

.btn-primary { background: var(--text); color: #0a0a0b; }
.btn-primary:hover { transform: translateY(-1px); background: #fff; }

.btn-ghost {
  border-color: var(--line-strong);
  color: var(--text);
  background: transparent;
}
.btn-ghost:hover { border-color: rgba(255, 255, 255, 0.34); background: rgba(255, 255, 255, 0.04); }

.meta-line {
  margin-top: 26px;
  font-size: 13px;
  color: var(--text-faint);
  font-variant-numeric: tabular-nums;
}

/* ---------- canvas art ---------- */
.canvas-art {
  position: relative;
  aspect-ratio: 4 / 3.4;
  border: 1px solid var(--line);
  border-radius: 20px;
  background:
    radial-gradient(circle at 30% 20%, rgba(255, 255, 255, 0.05), transparent 55%),
    linear-gradient(180deg, #0b0c0f, #08080a);
  overflow: hidden;
}

.canvas-art .grid-lines {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.045) 1px, transparent 1px);
  background-size: 34px 34px;
  mask-image: radial-gradient(circle at 50% 50%, #000 45%, transparent 82%);
}

.canvas-art svg { position: relative; width: 100%; height: 100%; display: block; }

/* ---------- sections ---------- */
section { position: relative; }

.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 24px;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 42px;
}

.section-head h2 {
  margin: 0;
  font-size: 24px;
  letter-spacing: -0.02em;
  font-weight: 600;
}

.section-head span { font-size: 13px; color: var(--text-faint); }

.features { padding: 84px 0; }

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.feature {
  background: var(--bg-soft);
  padding: 32px 28px 34px;
  transition: background 0.2s ease;
}

.feature:hover { background: #101116; }

.feature .idx {
  font-size: 12px;
  color: var(--text-faint);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.08em;
}

.feature h3 {
  margin: 16px 0 10px;
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.feature p { margin: 0; font-size: 14.5px; color: var(--text-dim); }

/* ---------- download ---------- */
.download { padding: 20px 0 96px; }

.dl-version {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-dim);
  margin-bottom: 26px;
  font-variant-numeric: tabular-nums;
}

.dl-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.dl-card {
  display: block;
  padding: 26px 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg-soft);
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.dl-card[data-state="ready"]:hover {
  border-color: var(--line-strong);
  transform: translateY(-2px);
}

.dl-card[data-state="pending"] { opacity: 0.55; cursor: default; }

.dl-card .os {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  font-size: 15.5px;
  font-weight: 550;
  margin-bottom: 8px;
}

.dl-card .os svg { opacity: 0.75; }

.dl-card .sub { font-size: 13px; color: var(--text-faint); }

.dl-card .tag {
  display: inline-block;
  margin-top: 16px;
  font-size: 12.5px;
  color: var(--text-dim);
  border-top: 1px solid var(--line);
  padding-top: 12px;
  width: 100%;
}

.dl-note {
  margin-top: 18px;
  font-size: 13px;
  color: var(--text-faint);
}

/* ---------- docs ---------- */
.docs { padding: 0 0 104px; }

.docs-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.doc-link {
  padding: 26px 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.028), transparent);
  transition: border-color 0.2s ease;
}

.doc-link:hover { border-color: var(--line-strong); }

.doc-link h3 { margin: 0 0 8px; font-size: 16px; font-weight: 600; }
.doc-link p { margin: 0; font-size: 14px; color: var(--text-dim); }
.doc-link .arrow { margin-top: 18px; font-size: 13px; color: var(--text-faint); }

/* ---------- footer ---------- */
.footer {
  border-top: 1px solid var(--line);
  padding: 52px 0 64px;
}

.footer-grid {
  display: flex;
  justify-content: space-between;
  gap: 40px;
  flex-wrap: wrap;
}

.footer .brand { font-size: 15px; letter-spacing: 0.01em; }

.footer address {
  font-style: normal;
  font-size: 13px;
  color: var(--text-faint);
  line-height: 1.9;
}

.footer .links { display: flex; gap: 22px; font-size: 13.5px; color: var(--text-dim); }
.footer .links a:hover { color: var(--text); }

.copy {
  margin-top: 36px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
  font-size: 12.5px;
  color: var(--text-faint);
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

/* ---------- docs page ---------- */
.docpage { padding: 72px 0 110px; }
.docpage h1 { font-size: clamp(30px, 4vw, 44px); }
.docpage .lede { max-width: 40em; }

.doc-body {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 56px;
  margin-top: 56px;
  padding-top: 40px;
  border-top: 1px solid var(--line);
}

.doc-toc { position: sticky; top: 88px; align-self: start; font-size: 13.5px; }
.doc-toc a { display: block; padding: 7px 0; color: var(--text-dim); }
.doc-toc a:hover { color: var(--text); }

.doc-content h2 {
  font-size: 21px;
  margin: 46px 0 14px;
  letter-spacing: -0.015em;
}
.doc-content h2:first-child { margin-top: 0; }
.doc-content p { color: var(--text-dim); font-size: 15px; }
.doc-content ol, .doc-content ul { color: var(--text-dim); font-size: 15px; padding-left: 22px; }
.doc-content li { margin: 8px 0; }

.doc-content code {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 13px;
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 1px 6px;
}

/* ---------- responsive ---------- */
@media (max-width: 900px) {
  .hero { padding: 72px 0 64px; }
  .hero-grid { grid-template-columns: 1fr; gap: 44px; }
  .canvas-art { aspect-ratio: 4 / 3; }
  .feature-grid, .dl-grid, .docs-grid { grid-template-columns: 1fr; }
  .nav-links { gap: 18px; font-size: 13px; }
  .doc-body { grid-template-columns: 1fr; gap: 28px; }
  .doc-toc { position: static; display: flex; gap: 18px; flex-wrap: wrap; border-bottom: 1px solid var(--line); padding-bottom: 16px; }
  .doc-toc a { padding: 0; }
}