/* apps/api — styles
 * 零 CSS 框架依赖，使用 CSS Custom Properties 实现 dark/light 切换（默认跟随 prefers-color-scheme，可手动覆盖）
 * 移动端 / 桌面端响应式（断点 720px）
 * WCAG AA 文字对比度（浅色 --text #1F2937，背景 #F8FAFC；深色 --text #E6E9EF，背景 #0B0E14）
 * 仅内联 SVG favicon；零外链字体/图片
 */

:root {
  --bg: #f8fafc;
  --panel: #ffffff;
  --text: #1f2937;
  --muted: #475569;
  --accent: #2563eb;
  --accent-fg: #ffffff;
  --border: #e2e8f0;
  --warn: #b45309;
  --good: #047857;
  --shadow: 0 1px 2px rgba(15, 23, 42, 0.04), 0 1px 3px rgba(15, 23, 42, 0.06);
  --radius: 8px;
  --max-w: 1080px;
  --font: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Roboto Mono", monospace;
}

:root[data-theme="dark"], [data-theme="dark"] {
  --bg: #0b0e14;
  --panel: #141a24;
  --text: #e6e9ef;
  --muted: #94a3b8;
  --accent: #60a5fa;
  --accent-fg: #0b0e14;
  --border: #232c3a;
  --warn: #fbbf24;
  --good: #34d399;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 1px 3px rgba(0, 0, 0, 0.5);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0b0e14;
    --panel: #141a24;
    --text: #e6e9ef;
    --muted: #94a3b8;
    --accent: #60a5fa;
    --accent-fg: #0b0e14;
    --border: #232c3a;
    --warn: #fbbf24;
    --good: #34d399;
  }
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --bg: #f8fafc;
    --panel: #ffffff;
    --text: #1f2937;
    --muted: #475569;
    --accent: #2563eb;
    --accent-fg: #ffffff;
    --border: #e2e8f0;
  }
}

* { box-sizing: border-box; }

html, body { margin: 0; padding: 0; }

body {
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 var(--font);
  -webkit-text-size-adjust: 100%;
}

a { color: var(--accent); text-underline-offset: 2px; }
a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible {
  outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px;
}

button, .btn {
  font: inherit; color: inherit; cursor: pointer;
  border: 1px solid var(--border); background: var(--panel);
  padding: 0.4rem 0.8rem; border-radius: 6px;
}
button:hover, .btn:hover { border-color: var(--accent); }
button[aria-pressed="true"] { background: var(--accent); color: var(--accent-fg); border-color: var(--accent); }

input[type="search"], input[type="text"], select {
  font: inherit; color: inherit; background: var(--panel);
  border: 1px solid var(--border); border-radius: 6px;
  padding: 0.4rem 0.6rem; min-width: 0;
}

.wrap { width: min(var(--max-w), calc(100% - 2rem)); margin-inline: auto; }

/* --- Header / Footer --- */
.site-header {
  border-bottom: 1px solid var(--border);
  background: var(--panel);
  position: sticky; top: 0; z-index: 10;
}
.site-header .wrap { display: flex; align-items: center; gap: 0.75rem; height: 3.5rem; flex-wrap: wrap; }
.brand { color: var(--text); font-weight: 700; text-decoration: none; }
.crumb { color: var(--muted); font-size: 0.9rem; }
.nav { margin-left: auto; display: flex; gap: 1rem; align-items: center; flex-wrap: wrap; }
.nav a { color: var(--text); text-decoration: none; }
.nav a:hover, .nav a[aria-current="page"] { color: var(--accent); }

.theme-toggle {
  display: inline-flex; align-items: center; gap: 0.3rem;
  padding: 0.3rem 0.5rem; font-size: 0.85rem;
}

.site-footer {
  border-top: 1px solid var(--border);
  margin-top: 3rem; padding: 1.5rem 0;
  background: var(--panel);
}
.site-footer .wrap { display: flex; gap: 1rem; flex-wrap: wrap; align-items: center; }
.site-footer a { color: var(--accent); text-decoration: none; }
.muted { color: var(--muted); font-size: 0.85rem; }

/* --- Hero --- */
.hero { padding: 2.5rem 0 1.5rem; }
h1 { margin: 0 0 0.5rem; font-size: clamp(1.6rem, 3vw, 2.4rem); line-height: 1.2; }
.lede { color: var(--muted); max-width: 60ch; }
.badge {
  display: inline-block;
  padding: 0.2rem 0.6rem; border: 1px solid var(--border); border-radius: 999px;
  color: var(--muted); font-size: 0.85rem; background: var(--panel);
}
.badge.warn { color: var(--warn); border-color: var(--warn); }
.badge.good { color: var(--good); border-color: var(--good); }

/* --- Section --- */
section { margin: 2rem 0; }
h2 { font-size: 1.2rem; border-left: 3px solid var(--accent); padding-left: 0.6rem; margin: 0 0 0.6rem; }
h3 { font-size: 1rem; margin: 0 0 0.4rem; }
.hint { color: var(--muted); font-size: 0.85rem; margin-top: -0.4rem; }

/* --- Cards / Grid --- */
.cards {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(16rem, 1fr));
  gap: 1rem; margin-top: 1rem;
}
.card {
  background: var(--panel); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1rem; box-shadow: var(--shadow);
  display: flex; flex-direction: column; gap: 0.4rem;
}
.card h3 { display: flex; gap: 0.4rem; align-items: baseline; }
.card .meta { color: var(--muted); font-size: 0.85rem; }
.card .note { color: var(--muted); font-size: 0.8rem; font-style: italic; margin-top: auto; }
.card .tags { display: flex; flex-wrap: wrap; gap: 0.25rem; margin-top: 0.3rem; }
.card .tag { font-size: 0.7rem; padding: 0.1rem 0.4rem; border: 1px solid var(--border); border-radius: 4px; color: var(--muted); }
.card a.title { color: var(--text); text-decoration: none; }
.card a.title:hover { color: var(--accent); }

/* --- Tables --- */
.table-scroll { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 0.92rem; }
caption { caption-side: top; text-align: left; color: var(--muted); padding: 0.5rem 0; }
th, td { text-align: left; padding: 0.55rem 0.7rem; border-bottom: 1px solid var(--border); white-space: nowrap; }
th { color: var(--muted); font-weight: 600; }
tbody tr:hover { background: var(--panel); }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; }

/* --- Filter Bar --- */
.filter-bar {
  background: var(--panel); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 0.8rem; margin: 1rem 0;
  display: grid; grid-template-columns: repeat(auto-fit, minmax(12rem, 1fr)); gap: 0.6rem;
  align-items: end;
}
.filter-bar label { display: flex; flex-direction: column; gap: 0.2rem; font-size: 0.85rem; color: var(--muted); }
.filter-bar input, .filter-bar select { width: 100%; }
.filter-bar .actions { display: flex; gap: 0.4rem; }

.empty {
  text-align: center; padding: 2rem 1rem; color: var(--muted);
  background: var(--panel); border: 1px dashed var(--border); border-radius: var(--radius);
}

/* --- Detail page --- */
.toc {
  position: sticky; top: 4rem; background: var(--panel);
  border: 1px solid var(--border); border-radius: var(--radius);
  padding: 0.8rem; font-size: 0.9rem; max-height: calc(100vh - 6rem); overflow-y: auto;
}
.toc h4 { margin: 0 0 0.4rem; font-size: 0.85rem; color: var(--muted); }
.toc ol { margin: 0; padding-left: 1.2rem; }
.toc a { color: var(--text); text-decoration: none; }
.toc a:hover { color: var(--accent); }

.detail-layout {
  display: grid; grid-template-columns: 16rem 1fr; gap: 1.5rem; align-items: start;
}
@media (max-width: 900px) {
  .detail-layout { grid-template-columns: 1fr; }
  .toc { position: static; max-height: none; }
}

.specs-list { display: grid; grid-template-columns: max-content 1fr; gap: 0.3rem 0.8rem; margin: 0.5rem 0; }
.specs-list dt { color: var(--muted); font-size: 0.9rem; }
.specs-list dd { margin: 0; }

.callout {
  background: var(--panel); border-left: 3px solid var(--warn);
  padding: 0.6rem 0.8rem; border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--text); font-size: 0.9rem; margin: 0.6rem 0;
}

/* --- Compare page --- */
.compare-picker {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(14rem, 1fr));
  gap: 0.5rem; margin: 1rem 0;
}
.compare-picker label {
  display: flex; align-items: center; gap: 0.4rem; padding: 0.4rem 0.6rem;
  background: var(--panel); border: 1px solid var(--border); border-radius: 6px;
  cursor: pointer;
}
.compare-picker label:has(input:checked) { border-color: var(--accent); background: var(--bg); }
.compare-picker input { margin: 0; }

.compare-matrix th:first-child, .compare-matrix td:first-child { white-space: normal; min-width: 8rem; }
.compare-matrix .best { color: var(--good); font-weight: 600; }

/* --- Chart --- */
.api-chart { display: block; max-width: 100%; height: auto; background: transparent; }
.chart-frame { background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); padding: 0.8rem; }
.chart-caption { color: var(--muted); font-size: 0.85rem; margin-top: 0.4rem; }

/* --- Copy button --- */
.copy-btn { font-size: 0.75rem; padding: 0.2rem 0.5rem; margin-left: 0.4rem; }

/* --- Skip link --- */
.skip-link {
  position: absolute; left: -1000px; top: 0;
  background: var(--accent); color: var(--accent-fg); padding: 0.5rem 1rem; z-index: 100;
}
.skip-link:focus { left: 0; }

/* --- Mobile tweaks --- */
@media (max-width: 720px) {
  .hero { padding: 1.5rem 0 1rem; }
  .nav { gap: 0.5rem; }
  .nav a { font-size: 0.9rem; }
  th, td { padding: 0.4rem 0.5rem; font-size: 0.85rem; }
  .card { padding: 0.8rem; }
}