:root {
  --bg: #ffffff;
  --ink: #090b0d;
  --muted: #5e646b;
  --line: #dfe3e6;
  --surface: #f4f6f7;
  --dark: #0b1014;
  --dark-surface: #141b20;
  --primary: #ff453d;
  --secondary: #08bfe8;
  --radius: 8px;
  --max: 1180px;
  font-family: "Arial", "Helvetica Neue", sans-serif;
  color: var(--ink);
  background: var(--bg);
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--bg); color: var(--ink); }
button, input { font: inherit; }
a { color: inherit; }
.shell { width: min(calc(100% - 40px), var(--max)); margin-inline: auto; }
.nav { height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; text-decoration: none; }
.bolt { color: var(--primary); font-size: 26px; line-height: 1; }
.nav-links { display: flex; align-items: center; gap: 28px; font-size: 14px; }
.nav-links a { text-decoration: none; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 46px; padding: 0 20px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--bg); font-weight: 700; text-decoration: none; cursor: pointer; }
.button.primary { color: white; border-color: var(--primary); background: var(--primary); }
.button.dark { color: white; border-color: var(--dark); background: var(--dark); }
.hero { min-height: 610px; display: grid; grid-template-columns: 1.08fr .92fr; gap: 56px; align-items: center; padding-block: 72px 96px; }
.hero h1 { max-width: 760px; margin: 0 0 24px; font-size: clamp(3.4rem, 7vw, 6.4rem); line-height: .96; letter-spacing: -.04em; text-wrap: balance; }
.accent { color: var(--primary); }
.hero p { max-width: 600px; margin: 0 0 30px; color: var(--muted); font-size: 18px; line-height: 1.65; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; }
.signal-map { min-height: 420px; position: relative; background-image: radial-gradient(circle, #cfd5d8 1px, transparent 1px); background-size: 26px 26px; }
.signal-node { position: absolute; width: 22px; height: 22px; background: var(--secondary); }
.signal-node.primary { width: 74px; height: 74px; display: grid; place-items: center; background: var(--primary); color: white; font-size: 38px; }
.signal-node.outline { border: 2px solid var(--ink); background: transparent; }
.signal-line { position: absolute; height: 2px; transform-origin: left; background: var(--primary); }
.dark-band { padding-block: 84px; background: var(--dark); color: white; }
.dark-band h2, .section h2 { margin: 0 0 42px; font-size: clamp(2.1rem, 4vw, 4.2rem); line-height: 1; letter-spacing: -.035em; }
.feature-row { display: grid; grid-template-columns: repeat(3, 1fr); }
.feature { min-height: 200px; padding: 12px 34px 12px 0; }
.feature + .feature { padding-left: 34px; border-left: 1px solid #334047; }
.feature strong { display: block; margin: 18px 0 12px; font-size: 20px; }
.feature p { margin: 0; color: #aeb8be; line-height: 1.65; }
.section { padding-block: 110px; }
.page-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.page-preview { border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.page-preview .frame { min-height: 250px; padding: 28px; background: var(--surface); }
.page-preview .copy { padding: 22px; }
.page-preview h3 { margin: 0 0 8px; }
.page-preview p { margin: 0; color: var(--muted); line-height: 1.55; }
.footer { padding-block: 54px; background: var(--dark); color: white; }
.footer-grid { display: grid; grid-template-columns: 2fr repeat(3, 1fr); gap: 36px; }
.footer a { color: #c6ced2; text-decoration: none; }
.footer p { color: #9ca8ae; line-height: 1.6; }
.stack { display: grid; gap: 12px; }
.mini-ui { display: grid; gap: 12px; }
.mini-ui > div { min-height: 16px; border-radius: 3px; background: #cfd5d8; }
.mini-ui > div:nth-child(1) { width: 72%; height: 34px; background: var(--ink); }
.mini-ui > div:nth-child(2) { width: 54%; }
.mini-ui > div:nth-child(3) { width: 88%; }
.mini-ui.dark { padding: 22px; background: var(--dark); }
.mini-ui.dark > div { background: #38434a; }
.mini-ui.dark > div:nth-child(1) { background: var(--primary); }

@media (max-width: 800px) {
  .nav-links a:not(.button) { display: none; }
  .hero { min-height: auto; grid-template-columns: 1fr; padding-block: 52px 72px; }
  .hero h1 { font-size: clamp(3rem, 15vw, 4.8rem); }
  .signal-map { min-height: 300px; }
  .feature-row, .page-grid, .footer-grid { grid-template-columns: 1fr; }
  .feature + .feature { padding-left: 0; padding-top: 30px; border-left: 0; border-top: 1px solid #334047; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .001ms !important; transition-duration: .001ms !important; }
}