:root {
  color-scheme: light;
  --ink: #0d1b2a;
  --ink-soft: #364257;
  --muted: #5b6776;
  --line: #e0e6ee;
  --paper: #fafbfd;
  --surface: #ffffff;
  --surface-strong: #eef2f8;
  --blue: #1e66f5;
  --blue-deep: #143a8a;
  --orange: #f08c2c;
  --code-bg: #0e1726;
  --code-fg: #e6edf6;
  --code-comment: #7e8aa1;
  --code-string: #a0d8a0;
  --code-keyword: #f0a050;
  --code-number: #82c8ff;
  --shadow: 0 14px 40px rgba(13, 27, 42, .08);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--paper);
  color: var(--ink);
  line-height: 1.6;
}

img { max-width: 100%; display: block; }
a { color: var(--blue); }

code, pre, .mono {
  font-family: "JetBrains Mono", "SF Mono", Menlo, Consolas, monospace;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 clamp(20px, 4vw, 56px);
}

/* Header */

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(250, 251, 253, .92);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 72px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--ink);
  font-weight: 800;
  font-size: 18px;
  letter-spacing: -0.01em;
}

.brand img { width: 36px; height: auto; }

.site-nav {
  display: flex;
  align-items: center;
  gap: 6px;
}

.site-nav a {
  padding: 8px 14px;
  border-radius: 8px;
  color: var(--ink-soft);
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
}

.site-nav a:hover,
.site-nav a.is-active { background: var(--surface-strong); color: var(--ink); }

.site-nav .gh {
  background: var(--ink);
  color: #fff;
}

.site-nav .gh:hover { background: var(--blue-deep); color: #fff; }

.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  padding: 9px;
}

.nav-toggle span {
  display: block;
  height: 2px;
  margin: 4px 0;
  background: var(--ink);
}

/* Sections */

.section { padding: clamp(56px, 8vw, 96px) 0; }

.section-band { background: var(--surface); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }

.eyebrow {
  margin: 0 0 14px;
  color: var(--blue);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: .08em;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  font-size: clamp(40px, 6vw, 72px);
  line-height: 1.02;
  font-weight: 900;
  letter-spacing: -0.02em;
}

h2 {
  margin: 0;
  font-size: clamp(28px, 3.6vw, 44px);
  line-height: 1.1;
  font-weight: 900;
  letter-spacing: -0.01em;
}

h3 {
  margin: 0 0 8px;
  font-size: 19px;
  font-weight: 800;
}

p { overflow-wrap: anywhere; }

.lead {
  margin: 24px 0 0;
  max-width: 720px;
  color: var(--ink-soft);
  font-size: clamp(17px, 1.8vw, 21px);
}

.section-heading { max-width: 820px; margin-bottom: clamp(32px, 5vw, 56px); }

/* Hero */

.hero-section {
  padding: clamp(56px, 8vw, 112px) 0 clamp(40px, 6vw, 80px);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(280px, 480px);
  gap: clamp(36px, 6vw, 80px);
  align-items: center;
}

.hero-visual { display: grid; place-items: center; }
.hero-visual img { width: min(360px, 80%); }

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

.button {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 48px;
  padding: 0 20px;
  border-radius: 8px;
  font-weight: 800;
  font-size: 15px;
  text-decoration: none;
  border: 1px solid transparent;
}

.button.primary { background: var(--ink); color: #fff; }
.button.primary:hover { background: var(--blue); }

.button.secondary {
  background: var(--surface);
  border-color: var(--line);
  color: var(--ink);
}

.button.secondary:hover { border-color: var(--blue); color: var(--blue); }

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 22px;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 10px;
  border-radius: 999px;
  background: var(--surface-strong);
  color: var(--ink-soft);
  font-size: 13px;
  font-weight: 700;
}

.tag .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--blue); }
.tag.orange .dot { background: var(--orange); }
.tag.deep .dot { background: var(--blue-deep); }

/* Cards */

.grid {
  display: grid;
  gap: 18px;
}

.grid.cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid.cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid.cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

.card {
  padding: 24px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 10px;
  box-shadow: 0 6px 18px rgba(13, 27, 42, .04);
}

.card.feature {
  border-top: 4px solid var(--blue);
}

.card.feature:nth-child(2n) { border-top-color: var(--orange); }
.card.feature:nth-child(3n) { border-top-color: var(--blue-deep); }

.card p { margin: 0; color: var(--muted); }

/* Language cards */

.lang-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 18px 20px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 10px;
  text-decoration: none;
  color: var(--ink);
  transition: border-color .15s ease, transform .15s ease;
}

.lang-card:hover {
  border-color: var(--blue);
  transform: translateY(-2px);
}

.lang-card .name { font-weight: 800; font-size: 17px; }
.lang-card .pkg { color: var(--muted); font-size: 13px; font-family: "JetBrains Mono", monospace; }

.lang-card .repo {
  margin-top: 2px;
  font-size: 13px;
  color: var(--blue);
  font-weight: 700;
}

/* Code blocks */

pre.code {
  margin: 0;
  padding: 20px 22px;
  background: var(--code-bg);
  color: var(--code-fg);
  border-radius: 10px;
  overflow-x: auto;
  font-size: 14px;
  line-height: 1.55;
  position: relative;
}

pre.code .c { color: var(--code-comment); font-style: italic; }
pre.code .s { color: var(--code-string); }
pre.code .k { color: var(--code-keyword); }
pre.code .n { color: var(--code-number); }
pre.code .t { color: #ffd58a; }

.copy-btn {
  position: absolute;
  top: 10px;
  right: 10px;
  padding: 5px 10px;
  font-size: 12px;
  font-weight: 700;
  background: rgba(255, 255, 255, .08);
  color: var(--code-fg);
  border: 1px solid rgba(255, 255, 255, .14);
  border-radius: 6px;
  cursor: pointer;
}

.copy-btn:hover { background: rgba(255, 255, 255, .14); }
.copy-btn.copied { color: #82c8ff; }

.code-label {
  display: inline-block;
  margin-bottom: 8px;
  padding: 3px 10px;
  background: var(--surface-strong);
  color: var(--ink-soft);
  font-size: 12px;
  font-weight: 700;
  border-radius: 999px;
  letter-spacing: .04em;
  text-transform: uppercase;
}

/* Examples grid (side-by-side or stacked) */

.examples { display: grid; gap: 28px; }

.example-block .lead {
  margin: 0 0 14px;
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
}

.example-block .desc {
  margin: 0 0 14px;
  color: var(--muted);
  font-size: 15px;
}

/* Benchmark tables */

table.bench {
  width: 100%;
  margin: 14px 0 12px;
  border-collapse: collapse;
  font-size: 14px;
}

table.bench th,
table.bench td {
  padding: 8px 10px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: baseline;
}

table.bench thead th {
  background: var(--surface-strong);
  color: var(--ink);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .03em;
  text-transform: uppercase;
}

table.bench td.num,
table.bench th.num {
  text-align: right;
  font-variant-numeric: tabular-nums;
  font-family: "JetBrains Mono", "SF Mono", Menlo, Consolas, monospace;
}

table.bench tbody tr:last-child td { border-bottom: 0; }

p.bench-note {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.55;
}

/* Spec page */

.prose {
  max-width: 860px;
}

.prose h2 { margin: 56px 0 16px; }
.prose h3 { margin: 36px 0 10px; font-size: 18px; }

.prose p { color: var(--ink-soft); }

.prose code:not(pre code) {
  padding: 2px 6px;
  background: var(--surface-strong);
  border-radius: 4px;
  font-size: 0.92em;
}

.toc {
  position: sticky;
  top: 88px;
  align-self: start;
  padding: 18px 20px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 10px;
}

.toc h4 { margin: 0 0 10px; font-size: 12px; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); }
.toc ol { margin: 0; padding: 0 0 0 20px; }
.toc li { margin: 6px 0; }
.toc a { color: var(--ink-soft); text-decoration: none; font-size: 14px; font-weight: 600; }
.toc a:hover { color: var(--blue); }

.spec-layout {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
  gap: 48px;
  align-items: start;
}

/* Railroad diagram embed */

.railroad-frame {
  margin: 12px 0 0;
  padding: 12px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 10px;
  overflow: auto;
  max-height: 720px;
}

.railroad-frame img,
.railroad-frame object,
.railroad-frame svg {
  display: block;
  margin: 0 auto;
  max-width: none; /* preserve native size for legibility */
}

/* Footer */

.site-footer {
  margin-top: 64px;
  padding: 36px 0;
  background: var(--ink);
  color: #b9c2d0;
}

.site-footer .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}

.site-footer .brand { color: #fff; }
.site-footer a { color: #b9c2d0; text-decoration: none; font-weight: 600; }
.site-footer a:hover { color: var(--orange); }

/* Responsive */

@media (max-width: 1080px) {
  .hero { grid-template-columns: 1fr; }
  .hero-visual { order: -1; }
  .grid.cols-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid.cols-3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .spec-layout { grid-template-columns: 1fr; }
  .toc { position: static; }
}

@media (max-width: 700px) {
  .nav-toggle { display: block; }
  .site-nav {
    position: absolute;
    left: 12px;
    right: 12px;
    top: calc(100% + 6px);
    display: none;
    flex-direction: column;
    align-items: stretch;
    padding: 10px;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 10px;
    box-shadow: var(--shadow);
  }
  .site-nav.is-open { display: flex; }
  .site-nav a { justify-content: flex-start; }
  .grid.cols-4, .grid.cols-3, .grid.cols-2 { grid-template-columns: 1fr; }
  h1 { font-size: 40px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}