/* =========================================================
   Rex 编程语言官网 - 共享样式
   ========================================================= */
:root {
  --dark: #0f172a;
  --dark-2: #1e293b;
  --dark-3: #273449;
  --bg: #f8fafc;
  --surface: #ffffff;
  --border: #e2e8f0;
  --text: #1e293b;
  --text-muted: #64748b;
  --link: #ca8a04;
  --link-hover: #a16207;
  --accent: #eab308;
  --accent-soft: #fef9c3;
  --green: #16a34a;
  --green-bg: #f0fdf4;
  --red: #dc2626;
  --code-bg: #0f172a;
  --code-text: #e2e8f0;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(15, 23, 42, .08), 0 8px 24px rgba(15, 23, 42, .06);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", "PingFang SC", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.75;
  font-size: 15px;
}
a { color: var(--link); text-decoration: none; }
a:hover { color: var(--link-hover); text-decoration: underline; }
code, pre, kbd {
  font-family: "JetBrains Mono", "Cascadia Code", Consolas, "Courier New", monospace;
}
img { max-width: 100%; }

.container { max-width: 1180px; margin: 0 auto; padding: 0 24px; }

/* ---------------- 顶部导航 ---------------- */
.topbar {
  position: sticky; top: 0; z-index: 100;
  background: rgba(15, 23, 42, .96);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(255,255,255,.08);
}
.topbar-inner {
  max-width: 1280px; margin: 0 auto; padding: 0 24px;
  height: 60px; display: flex; align-items: center; gap: 28px;
}
.brand { display: flex; align-items: center; gap: 8px; font-size: 20px; font-weight: 800; color: #fff; }
.brand:hover { text-decoration: none; color: #fff; }
.brand .logo { width: 26px; height: 26px; }
.brand .accent { color: var(--accent); }
.nav { display: flex; gap: 2px; margin-left: auto; align-items: center; }
.nav .links { display: flex; gap: 2px; align-items: center; }
.nav a {
  color: #cbd5e1; font-size: 14.5px; padding: 7px 13px; border-radius: 8px;
  transition: color .15s, background .15s;
}
.nav a:hover { color: #fff; background: rgba(255,255,255,.08); text-decoration: none; }
.nav a.active { color: var(--accent); background: rgba(234,179,8,.12); }
.nav .btn-download {
  background: var(--accent); color: #422006; font-weight: 700;
  margin-left: 10px; padding: 7px 16px; border-radius: 8px;
}
.nav .btn-download:hover { background: #facc15; color: #422006; text-decoration: none; }
.toc-toggle { display: none; background: none; border: 0; color: #cbd5e1; font-size: 22px; cursor: pointer; }

/* ---------------- 页脚 ---------------- */
.footer {
  background: var(--dark); color: #94a3b8; padding: 40px 0 48px;
  margin-top: 80px; font-size: 14px;
}
.footer-inner { max-width: 1180px; margin: 0 auto; padding: 0 24px; display: flex; gap: 48px; flex-wrap: wrap; justify-content: space-between; }
.footer h4 { color: #e2e8f0; margin: 0 0 12px; font-size: 15px; }
.footer a { color: #94a3b8; display: block; padding: 3px 0; }
.footer a:hover { color: var(--accent); text-decoration: none; }
.footer .copy { margin-top: 28px; border-top: 1px solid rgba(255,255,255,.08); padding-top: 18px; text-align: center; color: #64748b; }

/* ---------------- 通用组件 ---------------- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 11px 26px; border-radius: 10px; font-size: 15px; font-weight: 700;
  border: 0; cursor: pointer; transition: transform .12s, box-shadow .12s, background .15s;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn-primary { background: var(--accent); color: #422006; box-shadow: 0 4px 14px rgba(234,179,8,.35); }
.btn-primary:hover { background: #facc15; color: #422006; }
.btn-ghost { background: rgba(255,255,255,.1); color: #fff; border: 1px solid rgba(255,255,255,.25); }
.btn-ghost:hover { background: rgba(255,255,255,.18); color: #fff; }
.btn-outline { background: #fff; color: var(--dark); border: 1.5px solid var(--border); }
.btn-outline:hover { border-color: var(--accent); color: var(--dark); }

.badge {
  display: inline-block; padding: 3px 12px; border-radius: 999px;
  font-size: 12.5px; font-weight: 600; background: var(--accent-soft); color: #854d0e;
  border: 1px solid #fde68a;
}

.section { padding: 72px 0; }
.section-head { text-align: center; max-width: 760px; margin: 0 auto 44px; }
.section-head h2 { font-size: 30px; margin: 0 0 12px; }
.section-head p { color: var(--text-muted); font-size: 16px; margin: 0; }

.card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 26px; box-shadow: var(--shadow);
}

/* ---------------- 首页 Hero ---------------- */
.hero {
  background:
    radial-gradient(1200px 500px at 85% -10%, rgba(234,179,8,.22), transparent 60%),
    radial-gradient(900px 500px at -10% 110%, rgba(56,189,248,.14), transparent 55%),
    linear-gradient(160deg, #0f172a 0%, #16213a 55%, #1a2542 100%);
  color: #fff; padding: 96px 0 88px; overflow: hidden;
}
.hero-inner { max-width: 1180px; margin: 0 auto; padding: 0 24px; display: grid; grid-template-columns: 1.1fr .9fr; gap: 56px; align-items: center; }
.hero h1 { font-size: 46px; line-height: 1.25; margin: 18px 0 16px; letter-spacing: -.5px; }
.hero h1 .accent { color: var(--accent); }
.hero .sub { color: #cbd5e1; font-size: 17px; max-width: 540px; margin: 0 0 28px; }
.hero .badges { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 30px; }
.hero .badges .badge { background: rgba(234,179,8,.12); color: #fde68a; border-color: rgba(234,179,8,.35); }
.hero .cta { display: flex; gap: 14px; flex-wrap: wrap; }
.hero .meta { color: #94a3b8; font-size: 13.5px; margin-top: 18px; }
.hero-img { text-align: center; }
.hero-img img { border-radius: 16px; box-shadow: 0 24px 60px rgba(0,0,0,.45); border: 1px solid rgba(255,255,255,.1); }

/* 首页性能亮点 */
.perf-strip { background: var(--surface); border-bottom: 1px solid var(--border); }
.perf-strip .container { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; padding: 36px 24px; }
.perf-item { display: flex; align-items: center; gap: 16px; }
.perf-item .num { font-size: 30px; font-weight: 800; color: var(--accent); line-height: 1.2; white-space: nowrap; }
.perf-item .lbl { color: var(--text-muted); font-size: 13.5px; }
.perf-item .lbl b { color: var(--text); display: block; font-size: 14px; margin-bottom: 2px; }

/* 特性网格 */
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.feature { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 26px 24px; box-shadow: var(--shadow); transition: transform .15s, border-color .15s; }
.feature:hover { transform: translateY(-3px); border-color: #fde68a; }
.feature .icon { font-size: 26px; }
.feature h3 { margin: 12px 0 8px; font-size: 17px; }
.feature p { margin: 0; color: var(--text-muted); font-size: 14px; }

/* 首页快速开始 */
.quickstart { background: var(--surface); border-top: 1px solid var(--border); }
.quickstart-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 44px; align-items: start; }
.quickstart .steps { counter-reset: step; }
.quickstart .steps .step { position: relative; padding: 0 0 26px 52px; color: var(--text-muted); }
.quickstart .steps .step::before {
  counter-increment: step; content: counter(step);
  position: absolute; left: 0; top: 2px; width: 34px; height: 34px; border-radius: 50%;
  background: var(--dark); color: var(--accent); font-weight: 800;
  display: flex; align-items: center; justify-content: center; font-size: 15px;
}
.quickstart .steps h3 { margin: 0 0 6px; color: var(--text); font-size: 16.5px; }
.quickstart .steps code.inline { background: #f1f5f9; border: 1px solid var(--border); border-radius: 6px; padding: 1px 7px; font-size: 13.5px; color: #b45309; }

/* CTA 横幅 */
.cta-banner {
  background: linear-gradient(120deg, #1e293b, #273449);
  border-radius: 18px; color: #fff; padding: 48px 40px;
  display: flex; align-items: center; justify-content: space-between; gap: 30px; flex-wrap: wrap;
}
.cta-banner h2 { margin: 0 0 8px; font-size: 26px; }
.cta-banner p { margin: 0; color: #cbd5e1; }

/* ---------------- 代码块 ---------------- */
.code-block {
  position: relative; background: var(--code-bg); border-radius: var(--radius);
  margin: 18px 0; box-shadow: var(--shadow); overflow: hidden;
}
.code-block pre { margin: 0; padding: 18px 20px; overflow-x: auto; }
.code-block code { color: var(--code-text); font-size: 13.5px; line-height: 1.65; display: block; }
.cb-lang {
  position: absolute; top: 0; right: 0; font-size: 11px; letter-spacing: .5px;
  color: #64748b; background: rgba(255,255,255,.06); padding: 3px 10px;
  border-radius: 0 0 0 8px; font-family: monospace; text-transform: lowercase;
}
.copy-btn {
  position: absolute; top: 8px; right: 8px; z-index: 2;
  background: rgba(255,255,255,.08); color: #cbd5e1; border: 1px solid rgba(255,255,255,.14);
  border-radius: 7px; font-size: 12px; padding: 4px 10px; cursor: pointer; opacity: 0;
  transition: opacity .15s, background .15s;
}
.code-block:hover .copy-btn { opacity: 1; }
.copy-btn:hover { background: rgba(255,255,255,.16); color: #fff; }
.copy-btn.ok { background: rgba(22,163,74,.25); border-color: rgba(74,222,128,.4); color: #86efac; }

/* Rex 语法高亮 */
.tok-com { color: #64748b; font-style: italic; }
.tok-kw { color: #fbbf24; }
.tok-str { color: #86efac; }
.tok-num { color: #f9a8d4; }
.tok-fn { color: #93c5fd; }
.tok-bu { color: #fb923c; }
.tok-ns { color: #38bdf8; }
.tok-ty { color: #c4b5fd; }

/* 普通文本代码块（非 rex） */
.code-block code.plain { color: #cbd5e1; }

/* ---------------- 文档页面布局 ---------------- */
.docs-wrap { display: flex; max-width: 1280px; margin: 0 auto; min-height: 70vh; }
.sidebar {
  width: 292px; flex-shrink: 0; border-right: 1px solid var(--border);
  background: var(--surface); padding: 26px 20px 40px;
}
.sidebar-inner { position: sticky; top: 76px; max-height: calc(100vh - 96px); overflow-y: auto; }
.sidebar-title { font-size: 15px; font-weight: 800; color: var(--dark); margin: 0 10px 14px; }
.sidebar .site-nav { display: none; }
.toc { list-style: none; margin: 0; padding: 0; }
.toc li { margin: 0; }
.toc a {
  display: block; color: var(--text-muted); font-size: 13.5px; padding: 5px 10px;
  border-radius: 7px; border-left: 2px solid transparent;
}
.toc a:hover { color: var(--text); background: #f1f5f9; text-decoration: none; }
.toc a.active { color: #a16207; background: var(--accent-soft); border-left-color: var(--accent); font-weight: 600; }
.toc li.lvl3 a { padding-left: 26px; }
.toc li.lvl4 a { padding-left: 38px; font-size: 12.5px; }

.doc-content { flex: 1; min-width: 0; padding: 40px 56px 80px; background: var(--bg); }
.doc-content > h1:first-child { margin-top: 0; font-size: 32px; }
.doc-content h1 { font-size: 28px; margin: 40px 0 16px; padding-bottom: 10px; border-bottom: 2px solid var(--border); }
.doc-content h2 { font-size: 23px; margin: 40px 0 14px; padding-top: 8px; }
.doc-content h3 { font-size: 18.5px; margin: 30px 0 10px; }
.doc-content h2 code, .doc-content h3 code { font-size: .9em; }
.doc-content p { margin: 12px 0; }
.doc-content ul, .doc-content ol { margin: 12px 0; padding-left: 26px; }
.doc-content li { margin: 5px 0; }
code.il, a code.il { background: #f1f5f9; border: 1px solid #e2e8f0; border-radius: 5px; padding: 1px 6px; font-size: 13px; color: #b45309; }
a code.il { color: inherit; }

/* 表格 */
.doc-table-wrap { overflow-x: auto; margin: 18px 0; border: 1px solid var(--border); border-radius: 10px; }
.doc-table-wrap table, .bench-card table { width: 100%; border-collapse: collapse; background: var(--surface); font-size: 14px; }
.doc-table-wrap th, .doc-table-wrap td, .bench-card th, .bench-card td { padding: 9px 14px; border-bottom: 1px solid var(--border); text-align: left; vertical-align: top; }
.doc-table-wrap th, .bench-card th { background: #f1f5f9; font-weight: 700; white-space: nowrap; }
.doc-table-wrap tr:last-child td, .bench-card tr:last-child td { border-bottom: 0; }
.doc-table-wrap tbody tr:nth-child(even), .bench-card tbody tr:nth-child(even) { background: #f8fafc; }
.doc-table-wrap td code, .doc-table-wrap th code, .bench-card td code, .bench-card th code { background: #f1f5f9; border-radius: 4px; padding: 0 5px; font-size: 12.5px; color: #b45309; white-space: nowrap; }

/* 引用块（callout） */
.callout {
  background: #fffbeb; border: 1px solid #fde68a; border-left: 4px solid var(--accent);
  border-radius: 8px; padding: 12px 18px; margin: 18px 0;
}
.callout p { margin: 8px 0; }
.callout .callout { background: rgba(255,255,255,.7); }
.callout code.il { background: #fef3c7; border-color: #fde68a; }
.callout .code-block { margin: 12px 0; }

.doc-footer { margin-top: 56px; padding-top: 20px; border-top: 1px solid var(--border); display: flex; justify-content: space-between; gap: 16px; font-size: 14px; flex-wrap: wrap; }
.doc-footer a { font-weight: 600; }
.back-to-docs { margin: 24px 56px 0; font-size: 14px; }

/* ---------------- 性能页 ---------------- */
.bench-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 30px; margin: 20px 0; box-shadow: var(--shadow); }
.bench-card h3 { margin: 26px 0 10px; font-size: 16.5px; }
.bench-card ul { padding-left: 24px; margin: 12px 0; }
.bench-card li { margin: 6px 0; }
.bench-card h2 { margin: 0 0 6px; font-size: 21px; }
.bench-card .lead { color: var(--text-muted); margin: 0 0 18px; font-size: 14.5px; }
.win-tag { display: inline-block; background: var(--green-bg); color: var(--green); border: 1px solid #bbf7d0; border-radius: 999px; padding: 2px 12px; font-size: 12.5px; font-weight: 700; margin-left: 10px; vertical-align: middle; }

.bar-row { display: grid; grid-template-columns: 96px 1fr 110px; gap: 12px; align-items: center; margin: 12px 0; font-size: 14px; }
.bar-row .name { color: var(--text-muted); font-weight: 600; }
.bar-row .track { background: #eef2f7; border-radius: 6px; height: 22px; overflow: hidden; position: relative; }
.bar-row .fill { height: 100%; border-radius: 6px; background: linear-gradient(90deg, #93c5fd, #3b82f6); }
.bar-row.rex .fill { background: linear-gradient(90deg, #fde68a, var(--accent)); }
.bar-row .val { font-weight: 700; text-align: right; font-variant-numeric: tabular-nums; }

.perf-summary { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin: 26px 0; }
.perf-summary .item { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; text-align: center; box-shadow: var(--shadow); }
.perf-summary .item .k { font-size: 13px; color: var(--text-muted); }
.perf-summary .item .v { font-size: 30px; font-weight: 800; color: var(--dark); margin: 6px 0 2px; }
.perf-summary .item .v.good { color: var(--green); }
.perf-summary .item .s { font-size: 12.5px; color: var(--text-muted); }

details.full-data { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); margin: 24px 0; padding: 18px 24px; }
details.full-data summary { cursor: pointer; font-weight: 700; font-size: 15px; }

/* ---------------- 下载页 ---------------- */
.dl-hero { background: linear-gradient(150deg, #0f172a, #1e293b); color: #fff; padding: 64px 0; }
.dl-hero h1 { font-size: 34px; margin: 0 0 10px; }
.dl-hero p { color: #cbd5e1; margin: 0; max-width: 640px; }
.dl-box { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 34px; box-shadow: var(--shadow); margin-top: -44px; position: relative; }
.dl-box .file { display: flex; align-items: center; gap: 18px; flex-wrap: wrap; }
.dl-box .file .icon { font-size: 40px; }
.dl-box .file .info b { font-size: 17px; display: block; }
.dl-box .file .info span { color: var(--text-muted); font-size: 13.5px; }
.dl-box .file .btn { margin-left: auto; }
.dl-notes { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 24px; }
.dl-notes .n { background: #f8fafc; border: 1px solid var(--border); border-radius: 10px; padding: 16px 18px; font-size: 13.5px; }
.dl-notes .n b { display: block; margin-bottom: 4px; color: var(--dark); }
.dl-steps { counter-reset: step; list-style: none; padding: 0; margin: 0; }
.dl-steps li { position: relative; padding: 0 0 26px 52px; color: var(--text-muted); }
.dl-steps li::before {
  counter-increment: step; content: counter(step);
  position: absolute; left: 0; top: 2px; width: 34px; height: 34px; border-radius: 50%;
  background: var(--dark); color: var(--accent); font-weight: 800;
  display: flex; align-items: center; justify-content: center; font-size: 15px;
}
.dl-steps b { color: var(--text); }

/* ---------------- FAQ ---------------- */
.faq-item { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px 24px; margin: 14px 0; }
.faq-item h3 { margin: 0 0 6px; font-size: 16px; }
.faq-item p { margin: 0; color: var(--text-muted); font-size: 14.5px; }

/* ---------------- 响应式 ---------------- */
@media (max-width: 1024px) {
  .feature-grid, .perf-summary, .dl-notes { grid-template-columns: repeat(2, 1fr); }
  .hero-inner { grid-template-columns: 1fr; gap: 36px; }
  .hero-img { order: -1; }
  .quickstart-grid { grid-template-columns: 1fr; }
  .doc-content { padding: 28px 28px 60px; }
  .sidebar { width: 240px; }
}
@media (max-width: 820px) {
  .nav { position: relative; }
  .nav .links {
    display: none;
    position: fixed; top: 60px; left: 0; right: 0; z-index: 95;
    flex-direction: column; align-items: stretch; gap: 0;
    background: rgba(15, 23, 42, .98);
    border-top: 1px solid rgba(255,255,255,.08);
    box-shadow: 0 12px 30px rgba(0,0,0,.35);
    padding: 8px 14px 14px;
  }
  .nav.open .links { display: flex; }
  .nav .links a { display: block; padding: 12px 14px; font-size: 15px; }
  .nav .links a:hover { background: rgba(255,255,255,.08); }
  .nav .links .btn-download { margin-left: 0; margin-top: 6px; text-align: center; }
  .toc-toggle { display: block; }
  .sidebar {
    display: none; position: fixed; top: 60px; left: 0; bottom: 0; z-index: 90;
    width: 280px; background: var(--surface); box-shadow: 0 10px 40px rgba(0,0,0,.2);
    padding: 22px 16px 40px; overflow-y: auto;
  }
  .sidebar.open { display: block; }
  .sidebar .site-nav {
    display: block;
    border-bottom: 1px solid var(--border);
    margin-bottom: 14px;
    padding-bottom: 12px;
  }
  .sidebar .site-nav a {
    display: block; padding: 8px 10px; border-radius: 7px;
    font-size: 14px; font-weight: 600; color: var(--text);
  }
  .sidebar .site-nav a:hover { background: #f1f5f9; text-decoration: none; }
  .sidebar .site-nav .btn-download { color: #a16207; }
  .perf-strip .container { grid-template-columns: 1fr; gap: 16px; }
  .hero h1 { font-size: 34px; }
  .dl-box .file .btn { margin-left: 0; }
}
@media (max-width: 560px) {
  .feature-grid, .perf-summary, .dl-notes { grid-template-columns: 1fr; }
  .section { padding: 48px 0; }
  .bar-row { grid-template-columns: 76px 1fr 96px; gap: 8px; }
}