:root {
  --bg: #f6f8fb;
  --panel: rgba(255, 255, 255, 0.9);
  --panel-solid: #ffffff;
  --text: #172033;
  --muted: #64748b;
  --border: #e2e8f0;
  --primary: #0f62fe;
  --primary-dark: #0043ce;
  --code-bg: #0f172a;
  --code-text: #e2e8f0;
  --shadow: 0 18px 50px rgba(15, 23, 42, 0.08);
}

body.dark {
  --bg: #0b1020;
  --panel: rgba(17, 24, 39, 0.88);
  --panel-solid: #111827;
  --text: #e5e7eb;
  --muted: #94a3b8;
  --border: #253044;
  --primary: #60a5fa;
  --primary-dark: #93c5fd;
  --code-bg: #020617;
  --code-text: #dbeafe;
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.3);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(15, 98, 254, 0.16), transparent 34rem),
    linear-gradient(180deg, var(--bg), var(--bg));
}

a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--primary-dark); }

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 28px;
  border-bottom: 1px solid var(--border);
  background: var(--panel);
  backdrop-filter: blur(16px);
}

.brand { display: flex; align-items: center; gap: 14px; }
.logo {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border-radius: 14px;
  color: #fff;
  font-weight: 800;
  background: linear-gradient(135deg, #0f62fe, #6d5dfc);
  box-shadow: 0 10px 25px rgba(15, 98, 254, 0.25);
}
.brand-title { font-size: 17px; font-weight: 800; }
.brand-subtitle { margin-top: 2px; color: var(--muted); font-size: 12px; }
.top-actions { display: flex; align-items: center; gap: 10px; }
.top-actions button, .download {
  border: 1px solid var(--border);
  color: var(--text);
  background: var(--panel-solid);
  padding: 9px 13px;
  border-radius: 999px;
  font-size: 13px;
  cursor: pointer;
}
.download { color: #fff; background: var(--primary); border-color: var(--primary); }

.layout {
  display: grid;
  grid-template-columns: 300px minmax(0, 1fr);
  gap: 28px;
  max-width: 1480px;
  margin: 0 auto;
  padding: 28px;
}

.sidebar {
  position: sticky;
  top: 96px;
  height: calc(100vh - 120px);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  border: 1px solid var(--border);
  border-radius: 24px;
  background: var(--panel);
  box-shadow: var(--shadow);
}
.search-box { padding: 16px; border-bottom: 1px solid var(--border); }
.search-box input {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 12px 13px;
  color: var(--text);
  background: var(--panel-solid);
  outline: none;
}
#searchMeta {
  min-height: 18px;
  margin-top: 8px;
  color: var(--muted);
  font-size: 12px;
}
#toc { overflow: auto; padding: 12px; }
#toc a {
  display: block;
  padding: 8px 10px;
  color: var(--muted);
  border-radius: 10px;
  font-size: 13px;
  line-height: 1.35;
}
#toc a.level-1 { color: var(--text); font-weight: 700; margin-top: 6px; }
#toc a.level-2 { padding-left: 18px; }
#toc a.active, #toc a:hover { color: var(--primary); background: rgba(15, 98, 254, 0.1); }

.content { min-width: 0; }
.hero {
  padding: 42px;
  margin-bottom: 24px;
  border: 1px solid var(--border);
  border-radius: 28px;
  background: linear-gradient(135deg, rgba(15, 98, 254, 0.12), rgba(109, 93, 252, 0.05)), var(--panel);
  box-shadow: var(--shadow);
}
.badge {
  display: inline-flex;
  padding: 7px 12px;
  border-radius: 999px;
  color: var(--primary);
  background: rgba(15, 98, 254, 0.12);
  font-weight: 700;
  font-size: 12px;
}
.hero h1 { margin: 18px 0 12px; font-size: clamp(34px, 5vw, 58px); letter-spacing: -0.04em; }
.hero p { max-width: 850px; color: var(--muted); font-size: 17px; line-height: 1.8; }
.quick-links { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 24px; }
.quick-links a {
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--panel-solid);
  font-size: 14px;
}

.doc-article {
  padding: 42px;
  border: 1px solid var(--border);
  border-radius: 28px;
  background: var(--panel);
  box-shadow: var(--shadow);
}
.doc-article h1, .doc-article h2, .doc-article h3, .doc-article h4 { scroll-margin-top: 96px; line-height: 1.25; }
.doc-article h1 { margin: 44px 0 18px; padding-top: 10px; font-size: 36px; letter-spacing: -0.03em; }
.doc-article h2 { margin: 38px 0 16px; font-size: 26px; }
.doc-article h3 { margin: 28px 0 12px; font-size: 20px; }
.doc-article h4 { margin: 22px 0 10px; font-size: 17px; }
.doc-article p, .doc-article li { color: var(--text); line-height: 1.85; }
.doc-article p { margin: 12px 0; }
.doc-article ul { padding-left: 24px; }
.doc-article hr { margin: 42px 0; border: 0; border-top: 1px solid var(--border); }
.anchor { opacity: 0; margin-left: 8px; font-size: 0.75em; }
h1:hover .anchor, h2:hover .anchor, h3:hover .anchor, h4:hover .anchor { opacity: 1; }
code {
  padding: 2px 6px;
  border-radius: 7px;
  color: #d63384;
  background: rgba(214, 51, 132, 0.1);
  font-family: "JetBrains Mono", Consolas, monospace;
  font-size: 0.92em;
}
blockquote {
  margin: 18px 0;
  padding: 14px 18px;
  border-left: 4px solid var(--primary);
  border-radius: 14px;
  background: rgba(15, 98, 254, 0.08);
}
.table-wrap { overflow: auto; margin: 18px 0; border: 1px solid var(--border); border-radius: 16px; }
table { width: 100%; border-collapse: collapse; min-width: 680px; }
th, td { padding: 12px 14px; border-bottom: 1px solid var(--border); text-align: left; vertical-align: top; }
th { background: rgba(15, 98, 254, 0.08); font-weight: 800; }
tr:last-child td { border-bottom: 0; }

.code-block {
  overflow: hidden;
  margin: 18px 0;
  border: 1px solid rgba(148, 163, 184, 0.25);
  border-radius: 18px;
  background: var(--code-bg);
}
.code-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  color: #93c5fd;
  border-bottom: 1px solid rgba(148, 163, 184, 0.18);
  font-size: 12px;
}
.copy-btn {
  border: 1px solid rgba(148, 163, 184, 0.35);
  border-radius: 999px;
  padding: 5px 10px;
  color: var(--code-text);
  background: rgba(255, 255, 255, 0.06);
  cursor: pointer;
}
pre { margin: 0; padding: 18px; overflow: auto; }
pre code { padding: 0; color: var(--code-text); background: transparent; line-height: 1.75; font-size: 13px; }

mark { color: inherit; background: rgba(250, 204, 21, 0.35); border-radius: 4px; }
.back-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  width: 44px;
  height: 44px;
  display: none;
  border: 0;
  border-radius: 50%;
  color: #fff;
  background: var(--primary);
  box-shadow: var(--shadow);
  cursor: pointer;
}
.back-top.show { display: block; }

@media (max-width: 980px) {
  .topbar { height: auto; align-items: flex-start; flex-direction: column; gap: 12px; padding: 16px; }
  .layout { grid-template-columns: 1fr; padding: 16px; }
  .sidebar { position: relative; top: 0; height: 360px; }
  .hero, .doc-article { padding: 24px; border-radius: 22px; }
}