:root {
  --text: #1c1c1e; --muted: #636366; --accent: #0b7285; --on-accent: #ffffff;
  --bg: #ffffff; --surface: #f2f6f7; --line: #e3e8ea;
}
@media (prefers-color-scheme: dark) {
  :root {
    --text: #f2f2f7; --muted: #a1a1a6; --accent: #3bc9db; --on-accent: #00262c;
    --bg: #0b0d0e; --surface: #161b1d; --line: #262d30;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); }
header.site, main, footer.site { max-width: 960px; margin: 0 auto; padding-left: 20px; padding-right: 20px; }

header.site { display: flex; align-items: center; justify-content: space-between; padding-top: 18px; padding-bottom: 18px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 21px; letter-spacing: -0.01em; color: var(--text); text-decoration: none; }
.brand img { border-radius: 8px; }
nav a { margin-left: 20px; color: var(--muted); text-decoration: none; font-size: 16px; }
nav a:hover { color: var(--accent); }

.hero { text-align: center; padding: 56px 0 48px; }
.app-icon { border-radius: 25px; box-shadow: 0 10px 30px rgba(11, 114, 133, 0.25); }
.hero h1 { font-size: clamp(34px, 6vw, 52px); line-height: 1.1; letter-spacing: -0.02em; margin: 28px 0 16px; }
.lead { font-size: 20px; color: var(--muted); max-width: 620px; margin: 0 auto; }
.badge { display: inline-block; margin-top: 28px; padding: 12px 22px; border-radius: 999px;
  background: var(--accent); color: var(--on-accent); font-weight: 600; font-size: 16px; }

.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; }
.features article { background: var(--surface); border-radius: 18px; padding: 24px; }
.features svg { width: 30px; height: 30px; fill: none; stroke: var(--accent); stroke-width: 1.8;
  stroke-linecap: round; stroke-linejoin: round; }
.features h2 { font-size: 19px; margin: 12px 0 6px; }
.features p { margin: 0; color: var(--muted); font-size: 16px; }

.about { max-width: 620px; margin: 0 auto; text-align: center; padding: 48px 0 56px; }
.about h2 { font-size: 22px; margin: 0 0 8px; }
.about p { color: var(--muted); margin: 0; }

main.doc { max-width: 720px; padding-top: 24px; padding-bottom: 56px; }
.doc h1 { font-size: clamp(30px, 5vw, 40px); line-height: 1.15; letter-spacing: -0.02em; margin: 16px 0 8px; }
.doc h1 + p { color: var(--muted); }
.doc h2 { font-size: 22px; margin: 40px 0 8px; padding-top: 24px; border-top: 1px solid var(--line); }
.doc h3 { font-size: 18px; margin: 28px 0 6px; }
.doc li { margin: 4px 0; }
.doc table { border-collapse: collapse; width: 100%; font-size: 15px; display: block; overflow-x: auto; }
.doc th, .doc td { text-align: left; vertical-align: top; padding: 8px 10px; border-bottom: 1px solid var(--line); }

footer.site { display: flex; flex-wrap: wrap; gap: 8px 24px; justify-content: space-between;
  border-top: 1px solid var(--line); padding-top: 20px; padding-bottom: 36px; color: var(--muted); font-size: 15px; }
footer.site a { color: var(--muted); }
footer.site a:hover { color: var(--accent); }