:root {
  --bg: #000000;
  --surface: #121212;
  --surface-raised: #1e1e1e;
  --text: #ffffff;
  --text-secondary: rgba(255, 255, 255, 0.68);
  --text-tertiary: rgba(255, 255, 255, 0.42);
  --accent: #39ff14;
  --on-accent: #000000;
  --fur: #f07a2a;
  --radius: 16px;
  --max: 760px;
  color-scheme: dark;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "PingFang TC", "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 16px; }

/* Header */
header.site {
  position: sticky; top: 0; z-index: 10;
  background: rgba(0, 0, 0, 0.82);
  backdrop-filter: saturate(160%) blur(12px);
  -webkit-backdrop-filter: saturate(160%) blur(12px);
  border-bottom: 1px solid var(--surface-raised);
}
header.site .wrap { display: flex; align-items: center; justify-content: space-between; height: 60px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); font-weight: 700; font-size: 20px; }
.brand img { width: 32px; height: 32px; border-radius: 8px; }
.brand:hover { text-decoration: none; }
nav.site { display: flex; gap: 18px; font-size: 15px; }
nav.site a { color: var(--text-secondary); }
nav.site a[aria-current="page"], nav.site a:hover { color: var(--text); text-decoration: none; }

/* Home */
.hero { text-align: center; padding: 56px 0 32px; }
.hero img { width: min(260px, 70vw); aspect-ratio: 1; border-radius: 28px; }
.hero h1 { font-size: clamp(32px, 7vw, 48px); line-height: 1.12; margin: 24px 0 12px; letter-spacing: -0.02em; }
.hero h1 em { font-style: normal; color: var(--accent); }
.hero p.lede { color: var(--text-secondary); font-size: 19px; margin: 0 auto 28px; max-width: 560px; }
.badge {
  display: inline-block; padding: 12px 22px; border-radius: 999px;
  background: var(--accent); color: var(--on-accent); font-weight: 700;
}
.badge:hover { text-decoration: none; }
.badge.muted { background: var(--surface-raised); color: var(--text-secondary); }

.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 14px; padding: 24px 0 48px; }
.card { background: var(--surface); border-radius: var(--radius); padding: 20px; }
.card h3 { margin: 0 0 6px; font-size: 18px; }
.card p { margin: 0; color: var(--text-secondary); font-size: 15px; }
.card .zh { display: block; margin-top: 6px; color: var(--text-tertiary); font-size: 14px; }

/* Legal / content pages */
main.doc { padding: 40px 0 56px; }
main.doc h1 { font-size: 34px; margin: 0 0 4px; letter-spacing: -0.01em; }
main.doc .updated { color: var(--text-tertiary); font-size: 14px; margin: 0 0 28px; }
main.doc h2 { font-size: 21px; margin: 36px 0 8px; }
main.doc h3 { font-size: 17px; margin: 22px 0 6px; }
main.doc p, main.doc li { color: var(--text-secondary); }
main.doc strong { color: var(--text); }
main.doc ul, main.doc ol { padding-left: 22px; }
.callout { background: var(--surface); border-left: 3px solid var(--accent); border-radius: 8px; padding: 14px 16px; margin: 20px 0; }
.callout p { margin: 0; }
.todo { background: #3a2a00; color: #ffcf5a; border-radius: 4px; padding: 0 4px; font-weight: 600; }
details { background: var(--surface); border-radius: 12px; padding: 14px 16px; margin: 10px 0; }
summary { cursor: pointer; font-weight: 600; color: var(--text); }
details p { margin: 10px 0 0; }

/* Footer */
footer.site { border-top: 1px solid var(--surface-raised); padding: 28px 0 40px; color: var(--text-tertiary); font-size: 14px; }
footer.site .links { display: flex; flex-wrap: wrap; gap: 16px; margin-bottom: 10px; }
footer.site .links a { color: var(--text-secondary); }

@media (max-width: 480px) {
  nav.site { gap: 12px; font-size: 14px; }
  .brand span { display: none; }
}