:root {
  color-scheme: dark;
  --bg: #081421;
  --surface: #0d1c2c;
  --text: #f3f8fb;
  --muted: #97a8b8;
  --line: rgba(255, 255, 255, 0.09);
  --cyan: #71f0dc;
  --mint: #83efb7;
  --amber: #f2c36c;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-width: 320px;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "PingFang SC", "Helvetica Neue", sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
.shell { width: min(1120px, calc(100% - 40px)); margin-inline: auto; }
.ambient {
  position: fixed;
  z-index: -1;
  inset: 0 0 auto;
  height: 620px;
  background: radial-gradient(circle at 72% 7%, rgba(45, 237, 203, .18), transparent 35%), radial-gradient(circle at 20% 20%, rgba(45, 118, 247, .22), transparent 40%);
  pointer-events: none;
}
.nav { display: flex; align-items: center; justify-content: space-between; padding-block: 24px; }
.brand { display: flex; align-items: center; gap: 12px; font-size: 15px; font-weight: 700; letter-spacing: -.02em; }
.brand img { border-radius: 10px; }
.github-link { padding: 10px 16px; border: 1px solid var(--line); border-radius: 999px; background: rgba(255,255,255,.045); color: #d9e4ec; font-size: 14px; transition: .2s ease; }
.github-link:hover { border-color: rgba(113,240,220,.38); background: rgba(255,255,255,.08); }
.hero { min-height: 720px; display: grid; grid-template-columns: 1.08fr .92fr; align-items: center; gap: 56px; padding-block: 48px 88px; }
.trust { display: inline-flex; gap: 8px; align-items: center; margin: 0 0 24px; padding: 8px 12px; border: 1px solid rgba(113,240,220,.16); border-radius: 999px; background: rgba(113,240,220,.06); color: #cffbf3; font-size: 12px; font-weight: 650; }
h1 { margin: 0; font-size: clamp(54px, 7vw, 100px); line-height: .91; letter-spacing: -.075em; }
h1 span { color: transparent; background: linear-gradient(100deg, var(--cyan), var(--mint), var(--amber)); background-clip: text; -webkit-background-clip: text; }
.lede { max-width: 620px; margin: 30px 0 0; color: #bdc9d3; font-size: 19px; line-height: 1.75; }
.actions { display: flex; gap: 12px; margin-top: 34px; }
.button { display: inline-flex; min-height: 50px; align-items: center; justify-content: center; padding: 0 24px; border-radius: 13px; font-size: 14px; font-weight: 750; transition: transform .2s ease, filter .2s ease, background .2s ease; }
.button:hover { transform: translateY(-2px); }
.primary { background: linear-gradient(100deg, var(--cyan), var(--mint)); color: #071823; box-shadow: 0 18px 55px rgba(35,230,190,.2); }
.primary:hover { filter: brightness(1.06); }
.secondary { border: 1px solid var(--line); background: rgba(255,255,255,.045); }
.secondary:hover { background: rgba(255,255,255,.08); }
.requirements { margin-top: 16px; color: #64798a; font-size: 12px; }
.icon-stage { position: relative; width: 100%; max-width: 500px; margin-inline: auto; }
.icon-glow { position: absolute; inset: 12%; border-radius: 50%; background: rgba(54,229,201,.25); filter: blur(75px); }
.icon-card { position: relative; padding: 38px; border: 1px solid var(--line); border-radius: 38px; background: linear-gradient(180deg, rgba(255,255,255,.09), rgba(255,255,255,.025)); box-shadow: 0 38px 120px rgba(0,0,0,.5); backdrop-filter: blur(24px); }
.icon-card > img { display: block; width: 100%; height: auto; filter: drop-shadow(0 28px 38px rgba(0,0,0,.42)); }
.icon-labels { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin-top: 22px; }
.icon-labels span { padding: 10px 5px; border: 1px solid rgba(255,255,255,.07); border-radius: 9px; background: rgba(0,0,0,.15); color: #bcc9d3; text-align: center; font-size: 12px; font-weight: 600; }
.feature-section { padding: 96px 0; border-block: 1px solid rgba(255,255,255,.07); background: rgba(255,255,255,.022); }
.eyebrow { margin: 0; color: var(--cyan); font-size: 11px; font-weight: 800; letter-spacing: .2em; }
h2 { max-width: 700px; margin: 16px 0 0; font-size: clamp(38px, 5vw, 54px); line-height: 1.08; letter-spacing: -.05em; }
.feature-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; margin-top: 48px; }
.feature-grid article { padding: 28px; border: 1px solid var(--line); border-radius: 25px; background: rgba(5,14,24,.48); }
.feature-icon { display: grid; width: 44px; height: 44px; place-items: center; border: 1px solid rgba(113,240,220,.18); border-radius: 15px; background: rgba(113,240,220,.07); color: var(--cyan); font-size: 22px; }
.feature-grid small { display: block; margin-top: 27px; color: #607486; font-size: 10px; font-weight: 800; letter-spacing: .18em; }
.feature-grid h3 { margin: 9px 0 0; font-size: 20px; letter-spacing: -.025em; }
.feature-grid p { margin: 13px 0 0; color: #8799a9; font-size: 14px; line-height: 1.9; }
.safety { display: grid; grid-template-columns: 1fr 1fr; gap: 72px; align-items: center; padding-block: 96px; }
.amber { color: var(--amber); }
.safety-copy { max-width: 580px; margin-top: 22px; color: #8799a9; line-height: 1.9; }
.safety ul { display: grid; gap: 12px; margin: 0; padding: 0; list-style: none; }
.safety li { display: flex; align-items: center; gap: 14px; padding: 20px; border: 1px solid var(--line); border-radius: 17px; background: rgba(255,255,255,.03); color: #cfdae2; font-size: 14px; font-weight: 650; }
.safety li span { color: var(--mint); }
footer { padding: 30px 20px; border-top: 1px solid rgba(255,255,255,.07); color: #607486; text-align: center; font-size: 12px; }
footer a { color: #96adbd; }

@media (max-width: 820px) {
  .hero { grid-template-columns: 1fr; min-height: auto; padding-top: 70px; }
  .hero-copy { text-align: center; }
  .lede { margin-inline: auto; }
  .actions { justify-content: center; }
  .icon-stage { max-width: 420px; }
  .feature-grid, .safety { grid-template-columns: 1fr; }
  .safety { gap: 44px; }
}

@media (max-width: 560px) {
  .shell { width: min(100% - 28px, 1120px); }
  .brand span { font-size: 13px; }
  .github-link { padding: 9px 12px; font-size: 12px; }
  .hero { gap: 54px; padding-top: 48px; }
  h1 { font-size: clamp(48px, 15vw, 70px); }
  .lede { font-size: 16px; }
  .actions { flex-direction: column; }
  .button { width: 100%; }
  .icon-card { padding: 24px; border-radius: 28px; }
  .icon-labels { grid-template-columns: repeat(2, 1fr); }
  .feature-section, .safety { padding-block: 72px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}