:root {
  color-scheme: light dark;
  --bg: #f4f7fb;
  --surface: #ffffff;
  --text: #172033;
  --muted: #5d687a;
  --accent: #0668cc;
  --border: rgba(23, 32, 51, 0.1);
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1118;
    --surface: #171d27;
    --text: #f4f7fb;
    --muted: #a8b1c1;
    --accent: #4ca3ff;
    --border: rgba(255, 255, 255, 0.12);
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: radial-gradient(circle at 50% 0%, color-mix(in srgb, var(--accent) 12%, var(--bg)), var(--bg) 45%);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans", sans-serif;
  line-height: 1.65;
}
header, main, footer { width: min(900px, calc(100% - 40px)); margin-inline: auto; }
header { display: flex; align-items: center; justify-content: space-between; padding: 28px 0; }
.brand { color: var(--text); font-size: 22px; font-weight: 800; text-decoration: none; }
nav { display: flex; gap: 18px; }
nav a, footer a { color: var(--accent); text-decoration: none; }
.hero { padding: 72px 0 96px; text-align: center; }
.hero h1 { font-size: clamp(38px, 8vw, 68px); line-height: 1.08; letter-spacing: -0.04em; margin: 0 0 24px; }
.hero p { color: var(--muted); font-size: clamp(18px, 3vw, 23px); margin: 0 auto; max-width: 680px; }
.pill { display: inline-block; margin-top: 30px; padding: 12px 20px; border-radius: 999px; background: var(--accent); color: white; font-weight: 700; }
.card { background: var(--surface); border: 1px solid var(--border); border-radius: 24px; padding: clamp(24px, 5vw, 48px); margin-bottom: 32px; }
.features { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; margin-top: 48px; }
.feature { background: var(--surface); border: 1px solid var(--border); border-radius: 20px; padding: 24px; }
.feature h2 { font-size: 20px; margin: 0 0 8px; }
.feature p, .muted { color: var(--muted); }
h1 { font-size: clamp(34px, 6vw, 52px); line-height: 1.15; letter-spacing: -0.03em; }
h2 { margin-top: 40px; line-height: 1.25; }
h3 { margin-top: 28px; }
li { margin-bottom: 8px; }
footer { border-top: 1px solid var(--border); color: var(--muted); margin-top: 72px; padding: 30px 0 50px; }
@media (max-width: 620px) {
  header { align-items: flex-start; gap: 18px; }
  nav { flex-direction: column; gap: 6px; text-align: right; }
  .features { grid-template-columns: 1fr; }
}