:root {
  color-scheme: dark;
  --background: #07111f;
  --surface: #0d1a2c;
  --surface-elevated: #13223a;
  --text: #f4f7fb;
  --muted: #9aa8bd;
  --line: rgba(255, 255, 255, 0.12);
  --accent: #2eaaf0;
  --gain: #22c77a;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--background);
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: ui-sans-serif, -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 20% 0%, rgba(46, 170, 240, 0.18), transparent 34rem),
    radial-gradient(circle at 90% 18%, rgba(34, 199, 122, 0.12), transparent 28rem),
    var(--background);
  line-height: 1.65;
}

main {
  width: min(860px, calc(100% - 40px));
  margin: 0 auto;
  padding: 56px 0 72px;
}

.hero,
.card {
  border: 1px solid var(--line);
  border-radius: 28px;
  background: linear-gradient(180deg, rgba(19, 34, 58, 0.88), rgba(13, 26, 44, 0.82));
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.28);
}

.hero {
  padding: 40px;
}

.card {
  margin-top: 20px;
  padding: 30px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 24px;
  color: var(--muted);
  font-size: 14px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.brand-mark {
  width: 22px;
  height: 22px;
  border-radius: 999px;
  border: 5px solid var(--accent);
  border-left-color: var(--gain);
  border-bottom-color: #ffb11a;
}

h1 {
  margin: 0;
  font-size: clamp(38px, 7vw, 68px);
  line-height: 0.95;
  letter-spacing: -0.06em;
}

h2 {
  margin: 0 0 12px;
  font-size: 24px;
  letter-spacing: -0.03em;
}

h3 {
  margin: 28px 0 8px;
  font-size: 17px;
}

p,
li {
  color: var(--muted);
}

p.lede {
  max-width: 680px;
  margin: 24px 0 0;
  font-size: 18px;
}

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

a {
  color: var(--text);
  text-decoration-color: rgba(244, 247, 251, 0.35);
  text-underline-offset: 3px;
}

nav a,
.button-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0 16px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.05);
  text-decoration: none;
}

.meta {
  margin-top: 12px;
  color: var(--muted);
  font-size: 14px;
}

ul {
  padding-left: 22px;
}

footer {
  margin-top: 32px;
  color: var(--muted);
  font-size: 14px;
}

@media (max-width: 640px) {
  main {
    width: min(100% - 28px, 860px);
    padding-top: 28px;
  }

  .hero,
  .card {
    border-radius: 22px;
    padding: 24px;
  }
}