:root {
  --bg: #fbfaf7;
  --fg: #1d1b18;
  --muted: #6b665e;
  --line: #e7e2d9;
  --card: #ffffff;
  --code-bg: #1f1d1a;
  --code-fg: #f3efe7;
  --accent: #d9480f;
  --accent-soft: #fff1e8;
  --radius: 10px;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Noto Sans CJK SC", Helvetica, Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #151412;
    --fg: #ece8e1;
    --muted: #a39d93;
    --line: #2d2a26;
    --card: #1c1a17;
    --code-bg: #0e0d0c;
    --accent: #ff7a3d;
    --accent-soft: #2a1a10;
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.7 var(--sans);
  -webkit-font-smoothing: antialiased;
}

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

.wrap { max-width: 920px; margin: 0 auto; padding: 0 24px; }

/* Header */
header.top {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
header.top .wrap { display: flex; align-items: center; gap: 24px; height: 56px; }
.brand { font: 700 20px/1 var(--mono); color: var(--fg); letter-spacing: -0.5px; }
.brand span { color: var(--accent); }
.brand:hover { text-decoration: none; }
header nav { display: flex; gap: 20px; margin-left: auto; font-size: 15px; }
header nav a { color: var(--muted); }
header nav a:hover { color: var(--fg); text-decoration: none; }

/* Hero */
.hero { padding-top: 72px; padding-bottom: 40px; }
.hero h1 { font-size: clamp(32px, 5vw, 48px); line-height: 1.2; margin: 0 0 16px; letter-spacing: -0.5px; }
.hero h1 em { font-style: normal; color: var(--accent); }
.hero p.lead { font-size: 19px; color: var(--muted); margin: 0 0 32px; max-width: 680px; }

/* Code blocks */
.code {
  position: relative;
  background: var(--code-bg);
  color: var(--code-fg);
  border-radius: var(--radius);
  margin: 16px 0;
}
.code pre {
  margin: 0;
  padding: 16px 72px 16px 18px;
  overflow-x: auto;
  font: 14px/1.65 var(--mono);
}
.code .copy {
  position: absolute;
  top: 8px;
  right: 8px;
  border: 1px solid #3a3631;
  background: #2a2723;
  color: #cfc8bd;
  border-radius: 6px;
  font: 12px/1 var(--sans);
  padding: 6px 10px;
  cursor: pointer;
}
.code .copy:hover { color: #fff; }
.c { color: #8f887c; }

code { font-family: var(--mono); font-size: 0.92em; }
:not(pre) > code { background: var(--accent-soft); padding: 1px 6px; border-radius: 5px; }

/* Tabs */
.tabs { display: flex; gap: 4px; margin-top: 8px; }
.tabs button {
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--muted);
  border-radius: 999px;
  padding: 6px 14px;
  font: 14px/1 var(--sans);
  cursor: pointer;
}
.tabs button[aria-selected="true"] { color: var(--fg); border-color: var(--fg); }
[data-panel][hidden] { display: none; }
.note { color: var(--muted); font-size: 14px; }

/* Sections */
section { padding: 40px 0; border-top: 1px solid var(--line); }
section h2 { font-size: 26px; margin: 0 0 12px; letter-spacing: -0.3px; }
section h3 { font-size: 18px; margin: 28px 0 8px; }
section p { margin: 8px 0; }

.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 14px; margin-top: 20px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px 20px; }
.card h3 { margin: 0 0 6px; font-size: 16px; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }

table { width: 100%; border-collapse: collapse; margin: 16px 0; font-size: 14px; }
th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { color: var(--muted); font-weight: 600; }
.table-wrap { overflow-x: auto; }

footer { border-top: 1px solid var(--line); padding: 32px 0 48px; color: var(--muted); font-size: 14px; }
footer .wrap { display: flex; flex-wrap: wrap; gap: 16px; justify-content: space-between; }

@media (max-width: 640px) {
  header nav { gap: 14px; font-size: 14px; }
  header nav .hide-sm { display: none; }
  .hero { padding-top: 48px; padding-bottom: 24px; }
}