:root {
  color-scheme: light;
  --canvas: #f5f6f8;
  --surface: #ffffff;
  --aside: #ffffff;
  --line: #e3e6ee;
  --fg: #1a2333;
  --mist: #5b6b82;
  --glow: #0b8f62;
  --ice: #1d5fa8;
  --code-bg: #eef0f4;
  --code: #0a6b4a;
  --err: #b42318;
}

/* 手动选择「黑夜模式」 */
:root[data-theme="dark"] {
  color-scheme: dark;
  --canvas: #0d1420;
  --surface: #16202f;
  --aside: #182335;
  --line: #27334a;
  --fg: #e6ecf7;
  --mist: #9aa8c0;
  --glow: #21c190;
  --ice: #7db1ff;
  --code-bg: #1f2a3d;
  --code: #4edca3;
  --err: #ff8f86;
}

/* 未手动选择时，跟随系统外观 */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    color-scheme: dark;
    --canvas: #0d1420;
    --surface: #16202f;
    --aside: #182335;
    --line: #27334a;
    --fg: #e6ecf7;
    --mist: #9aa8c0;
    --glow: #21c190;
    --ice: #7db1ff;
    --code-bg: #1f2a3d;
    --code: #4edca3;
    --err: #ff8f86;
  }
}
* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; }
body {
  background: var(--canvas);
  color: var(--fg);
  font-family: "PingFang SC", "Noto Sans SC", system-ui, sans-serif;
}
a { color: var(--ice); text-decoration: none; }
header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem 1.4rem;
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--aside) 92%, transparent);
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  z-index: 20;
}
.brand { display: flex; align-items: center; gap: 0.7rem; color: var(--fg); }
.brand img { width: 36px; height: 36px; object-fit: contain; }
.brand strong { font-size: 0.95rem; letter-spacing: 0.06em; }
nav a { margin-left: 1.1rem; color: var(--mist); font-size: 0.92rem; }
nav a:hover, nav a.on { color: var(--glow); }
.theme {
  margin-left: 1.1rem;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--mist);
  border-radius: 0.4rem;
  padding: 0.3rem 0.6rem;
  font-size: 0.85rem;
  cursor: pointer;
  vertical-align: middle;
}
.theme:hover { color: var(--glow); border-color: var(--glow); }
main { max-width: 880px; margin: 0 auto; padding: 2.4rem 1.2rem 4rem; }
h1 { font-size: clamp(1.6rem, 4vw, 2.4rem); margin: 0 0 0.4rem; }
h2 { font-size: 1.15rem; margin: 2rem 0 0.7rem; }
.tag { color: var(--mist); font-family: ui-monospace, monospace; font-size: 0.9rem; }
.lead { color: var(--mist); line-height: 1.7; }
.grid { display: grid; gap: 0.85rem; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); margin: 1.2rem 0 0; }
.card {
  border: 1px solid var(--line);
  background: var(--surface);
  border-radius: 0.5rem;
  padding: 1rem 1.1rem;
}
.card h3 { margin: 0 0 0.4rem; font-size: 1rem; }
.card p, .card li { color: var(--mist); font-size: 0.9rem; line-height: 1.6; }
.card ol, .card ul { margin: 0.3rem 0 0; padding-left: 1.1rem; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 8.5rem;
  padding: 0.65rem 1.05rem;
  border-radius: 0.4rem;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--fg);
}
.btn-primary {
  border-color: var(--glow);
  background: var(--glow);
  color: #fff;
}
.btn-primary:hover { filter: brightness(1.05); }
.actions { display: flex; flex-wrap: wrap; gap: 0.7rem; margin-top: 1.4rem; }
footer { text-align: center; color: var(--mist); font-size: 0.75rem; padding: 2rem 1rem; }
code { font-family: ui-monospace, monospace; font-size: 0.82em; color: var(--glow); }

.docs {
  display: grid;
  grid-template-columns: 200px minmax(0, 1fr);
  gap: 2rem;
  max-width: 1040px;
  margin: 0 auto;
  padding: 2rem 1.2rem 4rem;
}
.toc {
  position: sticky;
  top: 4.4rem;
  align-self: start;
  border: 1px solid var(--line);
  background: var(--surface);
  border-radius: 0.5rem;
  padding: 0.85rem 1rem;
}
.toc .label { font-size: 0.75rem; color: var(--mist); margin: 0 0 0.5rem; }
.toc a { display: block; padding: 0.32rem 0; color: var(--mist); font-size: 0.88rem; line-height: 1.4; }
.toc a:hover, .toc a.on { color: var(--glow); }
.doc { min-width: 0; }
.doc h1 { font-size: 1.7rem; margin: 0 0 0.8rem; }
.doc h2 { font-size: 1.15rem; margin: 2rem 0 0.7rem; scroll-margin-top: 4.6rem; padding-top: 0.2rem; border-top: 1px solid var(--line); }
.doc h2:first-of-type { border-top: 0; }
.doc h3 { font-size: 1rem; margin: 1.2rem 0 0.4rem; }
.doc p, .doc li { color: var(--fg); line-height: 1.75; }
.doc p { margin: 0.6rem 0; }
.doc ul, .doc ol { margin: 0.4rem 0 0.8rem; padding-left: 1.2rem; }
.doc pre {
  background: var(--code-bg);
  border: 1px solid var(--line);
  border-radius: 0.4rem;
  padding: 0.85rem 1rem;
  overflow: auto;
  font-size: 0.84rem;
  line-height: 1.55;
}
.doc pre code { color: var(--fg); }
.doc code {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.84em;
  color: var(--code);
}
.doc a { text-decoration: underline; text-underline-offset: 2px; }
.doc .err { color: var(--err); }
body, header, .card, .toc, .doc pre, .btn, .theme {
  transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}
@media (max-width: 800px) {
  .docs { grid-template-columns: 1fr; }
  .toc { position: static; }
}
@media (max-width: 640px) {
  header { padding: 0.7rem 0.9rem; gap: 0.6rem; }
  .brand strong { display: none; }
  nav a { margin-left: 0.55rem; font-size: 0.86rem; }
  .theme { margin-left: 0.55rem; padding: 0.25rem 0.45rem; font-size: 0.8rem; }
}