:root {
  --bg: #f6f8f6;
  --surface: #ffffff;
  --text: #17231c;
  --muted: #5b6b61;
  --border: #e1e8e3;
  --primary: #16a34a;
  --primary-strong: #15803d;
  --primary-soft: #dcfce7;
  --accent-soft: #fef3c7;
  --accent-text: #92400e;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0a110d;
    --surface: #121c16;
    --text: #e9f1eb;
    --muted: #9fb2a6;
    --border: #22302a;
    --primary: #22c55e;
    --primary-strong: #4ade80;
    --primary-soft: #11351f;
    --accent-soft: #3a2f10;
    --accent-text: #fcd34d;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
a { color: var(--primary-strong); text-underline-offset: 2px; }
.top, main, footer { width: 100%; max-width: 960px; margin: 0 auto; padding-left: max(16px, env(safe-area-inset-left)); padding-right: max(16px, env(safe-area-inset-right)); }
.top { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding-top: 20px; padding-bottom: 20px; flex-wrap: wrap; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none; font-weight: 700; font-size: 20px; }
.brand svg { width: 36px; height: 36px; flex: none; }
.top nav, footer nav { display: flex; gap: 18px; flex-wrap: wrap; }
.top nav a, footer nav a { color: var(--muted); text-decoration: none; }
.top nav a:hover, footer nav a:hover { color: var(--text); }
main { padding-bottom: 48px; }
.hero { padding: 56px 0 32px; max-width: 720px; }
.hero h1 { font-size: clamp(34px, 7vw, 56px); line-height: 1.08; letter-spacing: -0.02em; margin: 0 0 16px; }
.lead { font-size: 20px; color: var(--muted); margin: 0 0 28px; }
.button { display: inline-block; background: var(--primary); color: #fff; text-decoration: none; font-weight: 600; padding: 14px 22px; border-radius: 14px; }
.button:hover { background: var(--primary-strong); color: #fff; }
.soon { display: inline-block; background: var(--accent-soft); color: var(--accent-text); padding: 10px 14px; border-radius: 12px; font-weight: 600; margin: 0; }
.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 14px; margin: 24px 0; }
.features article { background: var(--surface); border: 1px solid var(--border); border-radius: 18px; padding: 20px; }
.features h2 { font-size: 18px; margin: 0 0 8px; }
.features p { margin: 0; color: var(--muted); font-size: 16px; }
.note p { color: var(--muted); font-size: 15px; }
.prose { max-width: 720px; padding-top: 16px; }
.prose h1 { font-size: clamp(28px, 5vw, 40px); line-height: 1.15; margin: 8px 0 16px; }
.prose h2 { font-size: 22px; margin: 32px 0 8px; }
.prose h3 { font-size: 18px; margin: 24px 0 6px; }
.prose code { background: var(--primary-soft); padding: 1px 6px; border-radius: 6px; font-size: 0.9em; overflow-wrap: anywhere; }
.prose hr { border: 0; border-top: 1px solid var(--border); margin: 32px 0; }
.draft { background: var(--accent-soft); color: var(--accent-text); padding: 12px 14px; border-radius: 12px; font-weight: 600; }
.table { overflow-x: auto; margin: 16px 0; border: 1px solid var(--border); border-radius: 12px; }
table { border-collapse: collapse; width: 100%; font-size: 15px; }
th, td { text-align: left; vertical-align: top; padding: 10px 12px; border-top: 1px solid var(--border); }
thead th { border-top: 0; background: var(--surface); }
.open-app { padding: 48px 0; max-width: 560px; }
.open-app h1 { font-size: 32px; margin: 0 0 12px; }
.small { color: var(--muted); font-size: 15px; margin-top: 24px; }
footer { border-top: 1px solid var(--border); padding-top: 24px; padding-bottom: max(32px, env(safe-area-inset-bottom)); color: var(--muted); font-size: 14px; }
footer p { margin: 12px 0 0; }
.meta { color: var(--muted); font-size: 15px; margin: -4px 0 20px; }
.toc { background: var(--surface); border: 1px solid var(--border); border-radius: 16px; padding: 16px 20px; margin: 8px 0 28px; }
.toc p { margin: 0 0 8px; font-weight: 600; }
.toc ol { margin: 0; padding-left: 22px; columns: 2 220px; column-gap: 28px; }
.toc li { margin: 0; padding: 3px 0; break-inside: avoid; }
.toc a { text-decoration: none; }
.toc a:hover { text-decoration: underline; }
.legal h2 { scroll-margin-top: 16px; padding-top: 22px; border-top: 1px solid var(--border); margin-top: 28px; }
.legal ul { padding-left: 22px; }
.legal li { margin: 6px 0; }
.legal p, .legal li { color: var(--text); }