/* zhanlang 官网主题 — Vercel 风格 tokens（见 spec「视觉风格」） */
:root {
  --paper: #fafafa;
  --card: #ffffff;
  --hairline: #ebebeb;
  --ink: #171717;
  --body: #4d4d4d;
  --muted: #666666;
  --green: #297a3a;
  --card-ring: rgba(0,0,0,0.08);
  --radius: 6px;
  --sans: "Geist Variable", "Geist", ui-sans-serif, system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  --mono: "Geist Mono Variable", "Geist Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --maxw: 1280px;
  --docw: 720px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  overflow-x: hidden;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--green); text-decoration: none; }
a:hover { text-decoration: underline; }
main { max-width: var(--maxw); margin: 0 auto; padding: 0 32px; }

/* 顶栏 */
.nav {
  position: sticky; top: 0; z-index: 10;
  height: 64px; display: flex; align-items: center; gap: 24px;
  max-width: var(--maxw); margin: 0 auto; padding: 0 32px;
  background: color-mix(in srgb, var(--paper) 80%, transparent);
  backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
}
.nav .brand { color: var(--ink); font-weight: 500; font-size: 14px; }
.nav .brand:hover { text-decoration: none; }
.nav .brand .tri { margin-right: 6px; vertical-align: -2px; }
.nav .links { display: flex; gap: 20px; font-size: 14px; }
.nav .links a { color: var(--ink); }
.nav .spacer { flex: 1; }
.gh-link {
  color: var(--ink); display: inline-flex; align-items: center;
  line-height: 1;
}
.gh-link:hover { opacity: 0.7; text-decoration: none; }

/* 按钮 */
.btn {
  display: inline-block; padding: 10px 20px; border-radius: var(--radius);
  font-size: 14px; line-height: 1.43; cursor: pointer; border: none;
  font-family: var(--sans);
}
.btn:hover { text-decoration: none; }
.btn-primary { background: var(--ink); color: var(--paper); }
.btn-primary:hover { filter: brightness(0.92); }
.btn-ghost {
  background: transparent; color: var(--body);
  box-shadow: 0 0 0 1px var(--hairline);
}
.btn-ghost:hover { color: var(--ink); }

/* eyebrow 标签 */
.eyebrow {
  font-family: var(--mono); font-size: 11px; font-weight: 400;
  letter-spacing: 0.071em; text-transform: uppercase; color: var(--ink);
  margin: 0 0 12px;
}

/* 卡片 */
.card-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.card {
  background: var(--card); border-radius: var(--radius); padding: 20px;
  box-shadow: 0 0 0 1px var(--card-ring), 0 0 0 2px var(--paper);
}
.card h3 { margin: 0 0 8px; font-size: 18px; font-weight: 500; }
.card p { margin: 0; color: var(--body); font-size: 14px; }

/* Hero */
.hero { padding: 96px 0 64px; }
.hero h1 {
  margin: 0 0 20px; font-size: 64px; font-weight: 450;
  letter-spacing: -0.06em; line-height: 1; max-width: 18em;
}
.hero .sub { color: var(--body); font-size: 18px; margin: 0 0 32px; max-width: 36em; }
.hero .cta { display: flex; gap: 12px; }
.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  gap: 48px;
  align-items: center;
}
.hero .tagline {
  font-size: 20px; font-weight: 450; color: var(--body);
  margin: 0 0 20px; max-width: 30em;
}
.hero-code pre { margin: 0; }

/* 首页分区 */
.section { padding: 64px 0; }
.section h2 {
  margin: 0 0 24px; font-size: 30px; font-weight: 400;
  letter-spacing: -0.05em; line-height: 1.1;
}
.roadmap { display: flex; gap: 8px; flex-wrap: wrap; list-style: none; padding: 0; margin: 0; }
.roadmap li {
  font-family: var(--mono); font-size: 12px; letter-spacing: 0.05em;
  padding: 6px 12px; border-radius: 999px;
  box-shadow: 0 0 0 1px var(--hairline); color: var(--muted);
}
.roadmap li.current { background: var(--ink); color: var(--paper); box-shadow: none; }

/* 主题切换 */
.theme-toggle {
  background: transparent; border: none; cursor: pointer;
  font-size: 15px; line-height: 1; padding: 7px 8px;
  color: var(--ink); border-radius: var(--radius);
}
.theme-toggle:hover { box-shadow: 0 0 0 1px var(--hairline); }
.theme-toggle svg { display: block; }
.icon-sun { display: none; }
[data-theme="dark"] .icon-moon { display: none; }
[data-theme="dark"] .icon-sun { display: block; }

/* 代码 */
pre {
  background: var(--card); border-radius: var(--radius); padding: 16px;
  overflow-x: auto; font-size: 13px; line-height: 1.6;
  box-shadow: 0 0 0 1px var(--hairline);
}
code { font-family: var(--mono); font-size: 0.92em; }
:not(pre) > code {
  background: var(--card); padding: 2px 5px; border-radius: 4px;
  box-shadow: 0 0 0 1px var(--hairline);
}

/* 文档页 */
.doc-layout {
  display: grid; grid-template-columns: 220px minmax(0, var(--docw));
  gap: 48px; justify-content: center; padding: 48px 32px 96px;
}
.doc-toc { position: sticky; top: 88px; align-self: start; font-size: 13px; }
.doc-toc .toc-title {
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.071em;
  text-transform: uppercase; color: var(--muted); margin-bottom: 12px;
}
.doc-toc ul { list-style: none; padding: 0; margin: 0; }
.doc-toc li { margin: 6px 0; }
.doc-toc a { color: var(--body); }
.doc-toc a:hover { color: var(--ink); }
.doc-toc ul ul { padding-left: 12px; }
.doc-content h1 { font-size: 40px; font-weight: 450; letter-spacing: -0.04em; line-height: 1.1; margin: 0 0 32px; }
.doc-content h2 {
  font-size: 24px; font-weight: 500; letter-spacing: -0.02em;
  margin: 48px 0 16px; padding-top: 24px; border-top: 1px solid var(--hairline);
}
.doc-content h3 { font-size: 18px; font-weight: 500; margin: 32px 0 12px; }
.doc-content p, .doc-content li { color: var(--body); font-size: 15px; }
.doc-content li { margin: 4px 0; }
.doc-content table {
  border-collapse: collapse; width: 100%; margin: 16px 0; font-size: 14px;
}
.doc-content th, .doc-content td {
  border-bottom: 1px solid var(--hairline); padding: 8px 12px; text-align: left;
}
.doc-content th { font-weight: 500; color: var(--ink); }
.doc-content blockquote {
  margin: 16px 0; padding: 4px 20px; border-left: 3px solid var(--hairline); color: var(--muted);
}
.doc-page-title { display: none; }

/* Playground */
.play-layout {
  display: grid; grid-template-columns: 1fr 1fr; gap: 16px;
  padding: 32px 32px 96px; max-width: var(--maxw); margin: 0 auto;
  min-height: 60vh;
}
.play-pane { display: flex; flex-direction: column; gap: 8px; min-width: 0; }
.play-pane label {
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.071em;
  text-transform: uppercase; color: var(--muted);
}
.play-editor {
  flex: 1; min-height: 420px; resize: vertical;
  font-family: var(--mono); font-size: 13px; line-height: 1.6;
  padding: 16px; border-radius: var(--radius); border: none;
  background: var(--card); color: var(--ink);
  box-shadow: 0 0 0 1px var(--hairline);
}
.play-editor:focus { outline: none; box-shadow: 0 0 0 1px var(--ink); }
.play-output {
  flex: 1; min-height: 420px; margin: 0; padding: 16px;
  border-radius: var(--radius); background: var(--card);
  box-shadow: 0 0 0 1px var(--hairline);
  font-family: var(--mono); font-size: 13px; line-height: 1.6;
  white-space: pre-wrap; overflow-y: auto; color: var(--body);
}
.play-output .ok { color: var(--green); }
.play-output .err { color: #b00020; }
.play-select {
  font-family: var(--mono); font-size: 12px; padding: 6px 10px;
  border-radius: var(--radius); border: none; background: var(--card);
  color: var(--ink); box-shadow: 0 0 0 1px var(--hairline);
}

/* 页脚 */
.footer {
  border-top: 1px solid var(--hairline); margin-top: 64px;
  padding: 32px; max-width: var(--maxw); margin-left: auto; margin-right: auto;
  font-size: 13px; color: var(--muted);
  display: flex; gap: 24px; flex-wrap: wrap;
}
.footer a { color: var(--body); }
.footer .commit { font-family: var(--mono); font-size: 12px; }

[data-theme="dark"] {
  --paper: #0a0a0a;
  --card: #111111;
  --hairline: #2a2a2a;
  --ink: #ededed;
  --body: #a1a1a1;
  --muted: #888888;
  --green: #3fb950;
  --card-ring: rgba(255,255,255,0.06);
}
[data-theme="dark"] .play-output .err { color: #f85149; }

@media (max-width: 900px) {
  .hero h1 { font-size: 40px; }
  .card-grid { grid-template-columns: 1fr; }
  .doc-layout { grid-template-columns: 1fr; gap: 24px; }
  .doc-layout > * { min-width: 0; }
  .doc-toc { position: static; }
  .doc-toc a { overflow-wrap: break-word; }
  .doc-content { overflow-wrap: break-word; min-width: 0; }
  .doc-content table { display: block; overflow-x: auto; max-width: 100%; }
  .play-layout { grid-template-columns: 1fr; }
  .hero-grid { grid-template-columns: 1fr; }
  .nav {
    flex-wrap: wrap; height: auto; min-height: 64px;
    padding: 12px 20px; gap: 10px 20px; row-gap: 8px;
  }
  .nav .spacer { display: none; }
  main { padding: 0 20px; }
  .hero { padding: 64px 0 48px; }
}

@media (max-width: 600px) {
  .hero h1 { font-size: 32px; }
  .hero .sub { font-size: 16px; }
  .section h2 { font-size: 24px; }
  .doc-content h1 { font-size: 30px; }
  .nav { padding: 10px 16px; }
  .nav .links { flex-wrap: wrap; gap: 12px; }
  .play-layout, .doc-layout { padding: 24px 16px 64px; }
  .play-editor, .play-output { min-height: 280px; }
  .card { padding: 16px; }
}