:root {
  --ink: #172033;
  --muted: #60708a;
  --line: #dce4ee;
  --paper: #f6f8fb;
  --card: #ffffff;
  --blue: #3867ff;
  --blue-dark: #2444b3;
  --violet: #7357ff;
  --shadow: 0 18px 50px rgba(26, 46, 91, .10);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font: 16px/1.65 Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
a { color: var(--blue-dark); text-decoration: none; }
a:hover { text-decoration: underline; }
.shell { width: min(1120px, calc(100% - 40px)); margin: 0 auto; }
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 22px 0;
}
.brand { color: var(--ink); font-weight: 800; letter-spacing: -.03em; }
.brand span { color: var(--blue); }
.nav-links { display: flex; flex-wrap: wrap; gap: 20px; font-size: 14px; }
.nav-links a { color: var(--muted); }
.hero { padding: 86px 0 92px; }
.eyebrow { color: var(--blue); font-size: 13px; font-weight: 800; letter-spacing: .16em; text-transform: uppercase; }
.hero h1 { max-width: 850px; margin: 14px 0 22px; font-size: clamp(42px, 7vw, 76px); line-height: 1.02; letter-spacing: -.065em; }
.hero p { max-width: 700px; margin: 0; color: var(--muted); font-size: 20px; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 34px; }
.button { display: inline-block; padding: 12px 18px; border: 1px solid var(--blue); border-radius: 9px; background: var(--blue); color: white; font-weight: 750; }
.button:hover { background: var(--blue-dark); text-decoration: none; }
.button.secondary { border-color: var(--line); background: var(--card); color: var(--ink); }
.gradient-line { height: 5px; background: linear-gradient(90deg, var(--blue), var(--violet), #e2ad4d); }
.section { padding: 78px 0; }
.section h2 { margin: 0 0 12px; font-size: clamp(30px, 4vw, 46px); letter-spacing: -.045em; line-height: 1.1; }
.section-lead { max-width: 680px; margin: 0 0 30px; color: var(--muted); font-size: 18px; }
.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.card { padding: 25px; border: 1px solid var(--line); border-radius: 14px; background: var(--card); box-shadow: var(--shadow); }
.card h3 { margin: 0 0 8px; font-size: 20px; }
.card p { margin: 0; color: var(--muted); }
.number { color: var(--blue); font-weight: 850; }
.code { overflow-x: auto; padding: 22px; border-radius: 12px; background: #111a2e; color: #dce7ff; box-shadow: var(--shadow); }
pre { margin: 0; font: 14px/1.7 "SFMono-Regular", Consolas, monospace; }
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; align-items: start; }
.architecture { display: grid; grid-template-columns: 1fr auto 1fr auto 1.15fr; gap: 12px; align-items: center; margin-top: 34px; }
.architecture-column { display: grid; gap: 10px; }
.architecture-label { margin-bottom: 2px; color: var(--muted); font-size: 12px; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; }
.architecture-box { padding: 14px 16px; border: 1px solid var(--line); border-radius: 10px; background: var(--card); box-shadow: var(--shadow); font: 14px/1.45 "SFMono-Regular", Consolas, monospace; }
.architecture-box.accent { border-color: #aebdff; background: #e8edff; color: var(--blue-dark); font-weight: 750; }
.architecture-box.result { border-color: #b8e4d4; background: #edf9f4; color: var(--green); font-weight: 750; }
.architecture-arrow { color: var(--blue); font-size: 28px; font-weight: 900; }
.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 30px; }
.stat { padding: 24px; border-radius: 14px; background: #111a2e; color: white; }
.stat strong { display: block; margin-bottom: 4px; color: #9fb3ff; font-size: 42px; line-height: 1; letter-spacing: -.06em; }
.stat span { color: #cad4eb; }
.check-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px 24px; padding: 0; margin: 22px 0 0; list-style: none; color: var(--muted); }
.check-list li::before { margin-right: 8px; color: var(--green); content: "✓"; font-weight: 900; }
.callout { border-color: #f0d7a2; background: #fffaf0; }
.callout h3 { color: #8c5d12; }
.list { padding-left: 20px; color: var(--muted); }
.list li { margin: 8px 0; }
.tag { display: inline-block; margin: 0 6px 6px 0; padding: 3px 9px; border-radius: 99px; background: #e8edff; color: var(--blue-dark); font-size: 12px; font-weight: 750; }
.article { max-width: 780px; }
.article h1 { margin: 12px 0; font-size: clamp(38px, 6vw, 62px); line-height: 1.04; letter-spacing: -.06em; }
.article h2 { margin-top: 40px; }
.article p, .article li { color: var(--muted); }
.draft { display: inline-block; padding: 4px 9px; border-radius: 99px; background: #fff1cc; color: #8c5d12; font-size: 12px; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; }
.workflow { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin: 32px 0; }
.workflow-step { position: relative; padding: 22px; border: 1px solid var(--line); border-radius: 12px; background: var(--card); box-shadow: var(--shadow); }
.workflow-step:not(:last-child)::after { position: absolute; top: 50%; right: -22px; color: var(--blue); content: "→"; font-size: 24px; font-weight: 900; }
.workflow-step h3 { margin: 0 0 6px; }
.workflow-step p { margin: 0; color: var(--muted); font-size: 14px; }
.playground { padding: 26px; border: 1px solid #aebdff; border-radius: 14px; background: #f0f3ff; }
.playground select, .playground textarea { width: 100%; border: 1px solid var(--line); border-radius: 9px; background: white; color: var(--ink); font: inherit; }
.playground select { padding: 11px 12px; }
.playground textarea { min-height: 260px; margin-top: 14px; padding: 16px; resize: vertical; font: 14px/1.6 "SFMono-Regular", Consolas, monospace; }
.playground-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 12px; }
.command { margin-top: 18px; }
.error-page { display: grid; min-height: 72vh; place-items: center; padding: 42px 0 80px; }
.error-card { max-width: 720px; padding: clamp(28px, 6vw, 64px); border: 1px solid var(--line); border-radius: 18px; background: var(--card); box-shadow: var(--shadow); text-align: center; }
.error-code { margin: 0; color: var(--blue); font-size: clamp(88px, 18vw, 180px); font-weight: 900; line-height: .85; letter-spacing: -.1em; }
.error-card h1 { margin: 26px 0 10px; font-size: clamp(28px, 4vw, 44px); letter-spacing: -.05em; }
.error-card p { max-width: 520px; margin: 0 auto; color: var(--muted); font-size: 18px; }
.error-card .actions { justify-content: center; }
footer { padding: 30px 0 46px; border-top: 1px solid var(--line); color: var(--muted); font-size: 14px; }
@media (max-width: 760px) {
  .nav { align-items: flex-start; flex-direction: column; }
  .hero { padding: 56px 0 62px; }
  .grid, .two-col, .stats { grid-template-columns: 1fr; }
  .architecture { grid-template-columns: 1fr; }
  .architecture-arrow { justify-self: center; transform: rotate(90deg); }
  .check-list { grid-template-columns: 1fr; }
  .workflow { grid-template-columns: 1fr; }
  .workflow-step:not(:last-child)::after { top: auto; right: auto; bottom: -28px; left: 50%; transform: rotate(90deg); }
  .shell { width: min(100% - 28px, 1120px); }
}