:root {
  --accent: #4f5bea;
  --accent-dark: #2e1f8c;
  --text: #1d1d1f;
  --muted: #6e6e73;
  --bg: #ffffff;
  --card: #f5f5f7;
}
@media (prefers-color-scheme: dark) {
  :root { --text: #f5f5f7; --muted: #a1a1a6; --bg: #000000; --card: #1c1c1e; }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font: 17px/1.55 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", sans-serif;
  color: var(--text);
  background: var(--bg);
}
main { max-width: 760px; margin: 0 auto; padding: 48px 24px 64px; }
header.hero { text-align: center; padding: 32px 0 16px; }
header.hero img { width: 128px; height: 128px; }
h1 { font-size: 48px; margin: 12px 0 4px; letter-spacing: -0.02em; }
h2 { margin-top: 40px; }
.tagline { font-size: 22px; color: var(--muted); margin: 0 0 28px; }
.button {
  display: inline-block; padding: 12px 22px; border-radius: 12px;
  background: linear-gradient(180deg, var(--accent), var(--accent-dark));
  color: #fff; text-decoration: none; font-weight: 600;
}
.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 16px; margin-top: 40px; }
.feature { background: var(--card); border-radius: 14px; padding: 18px; }
.feature h3 { margin: 0 0 6px; font-size: 17px; }
.feature p { margin: 0; color: var(--muted); font-size: 15px; }
kbd { font: 14px ui-monospace, SFMono-Regular, monospace; background: var(--card); border-radius: 6px; padding: 2px 6px; }
a { color: var(--accent); }
footer { text-align: center; color: var(--muted); font-size: 14px; padding: 24px; }
footer a { color: var(--muted); margin: 0 8px; }
.back { font-size: 15px; }