:root {
  --bg: #0b0d12;
  --surface: #151923;
  --surface-2: #1c2130;
  --line: #262c3c;
  --text: #eef1f7;
  --muted: #9aa3b5;
  --accent: #ff9f0a;
  --accent-2: #64d2ff;
  --radius: 16px;
  color-scheme: dark;
}
@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --bg: #f6f7fa;
    --surface: #ffffff;
    --surface-2: #eef1f6;
    --line: #dfe3eb;
    --text: #151923;
    --muted: #5d6679;
    --accent: #d97a00;
    --accent-2: #0a84ff;
    color-scheme: light;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.75 -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
}
a { color: var(--accent-2); text-decoration: none; }
a:hover { text-decoration: underline; }

.nav {
  position: sticky; top: 0; z-index: 10;
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter: saturate(160%) blur(14px);
  -webkit-backdrop-filter: saturate(160%) blur(14px);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  max-width: 880px; margin: 0 auto; padding: 10px 16px;
  display: flex; align-items: center; gap: 16px; flex-wrap: wrap;
}
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); font-weight: 600; }
.brand:hover { text-decoration: none; }
.brand img { width: 30px; height: 30px; border-radius: 8px; }
.nav-links { display: flex; gap: 4px; margin-left: auto; flex-wrap: wrap; }
.nav-links a {
  color: var(--muted); padding: 4px 10px; border-radius: 999px; font-size: 15px;
}
.nav-links a:hover, .nav-links a[aria-current="page"] {
  color: var(--text); background: var(--surface-2); text-decoration: none;
}

main { max-width: 880px; margin: 0 auto; padding: 32px 16px 64px; }
h1 { font-size: 30px; line-height: 1.3; margin: 0 0 8px; letter-spacing: -0.01em; }
h2 {
  font-size: 21px; line-height: 1.4; margin: 44px 0 12px; padding-top: 8px;
  scroll-margin-top: 72px;
}
h3 { font-size: 17px; margin: 24px 0 6px; scroll-margin-top: 72px; }
p, li { color: var(--text); }
ul, ol { padding-left: 1.3em; }
li + li { margin-top: 4px; }
.meta { color: var(--muted); font-size: 14px; margin: 0 0 24px; }
.lead { font-size: 17px; color: var(--muted); }
strong { font-weight: 600; }
code, kbd {
  font: 14px/1.4 ui-monospace, SFMono-Regular, Menlo, monospace;
  background: var(--surface-2); padding: 1px 6px; border-radius: 6px;
}

.card {
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 18px 20px; margin: 16px 0;
}
.card > :first-child { margin-top: 0; }
.card > :last-child { margin-bottom: 0; }
.callout { border-left: 3px solid var(--accent); }

.toc { font-size: 15px; }
.toc ol { margin: 6px 0 0; }

table { width: 100%; border-collapse: collapse; font-size: 15px; margin: 12px 0; }
th, td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { color: var(--muted); font-weight: 500; }
.table-wrap { overflow-x: auto; }

/* Landing */
.hero { text-align: center; padding: 40px 0 16px; }
.hero img { width: 112px; height: 112px; border-radius: 26px; box-shadow: 0 12px 40px rgba(0,0,0,.35); }
.hero h1 { font-size: 36px; margin-top: 20px; }
.hero .lead { max-width: 560px; margin: 8px auto 0; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 14px; margin-top: 32px; }
.grid .card { margin: 0; }
.grid .card h3 { margin-top: 0; }
.grid .card p { margin: 0; color: var(--muted); font-size: 15px; }
.links { display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; margin-top: 36px; }
.btn {
  display: inline-block; padding: 10px 18px; border-radius: 999px;
  background: var(--surface-2); color: var(--text); border: 1px solid var(--line); font-weight: 500;
}
.btn:hover { text-decoration: none; border-color: var(--accent); }
.btn.primary { background: var(--accent); color: #1a1000; border-color: transparent; }

footer {
  border-top: 1px solid var(--line); color: var(--muted); font-size: 14px;
  max-width: 880px; margin: 0 auto; padding: 24px 16px 40px;
  display: flex; flex-wrap: wrap; gap: 8px 20px;
}
footer a { color: var(--muted); }

@media (max-width: 560px) {
  h1 { font-size: 26px; }
  .hero h1 { font-size: 30px; }
  .nav-links { margin-left: 0; }
}