:root {
  --brand: #5b5bd6;
  --brand-deep: #4a45c4;
  --brand-grad: linear-gradient(135deg, #6a5df4 0%, #4f7df9 100%);
  --ink: #1f2233;
  --ink-2: #4b4f63;
  --ink-3: #7a7e93;
  --line: #e4e5ee;
  --bg: #f5f6fb;
  --card: #ffffff;
  --ac-green: #1a7f37;
  --ac-green-bg: #e7f6ec;
  --ac-red: #c0392b;
  --ac-red-bg: #fdecea;
  --ac-amber: #9a6700;
  --ac-amber-bg: #fff4d6;
  --radius: 12px;
  --shadow: 0 1px 2px rgba(31, 34, 51, .04), 0 8px 24px rgba(31, 34, 51, .06);
  --font: "Segoe UI", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --mono: "Cascadia Code", Consolas, "JetBrains Mono", monospace;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  font-size: 15px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; }
.container { max-width: 1080px; margin: 0 auto; padding: 0 24px; }

/* ---------- 顶部导航 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255, 255, 255, .88);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.site-header .container {
  display: flex; align-items: center; gap: 28px;
  height: 60px;
}
.logo { display: flex; align-items: center; gap: 10px; color: var(--ink); }
.logo:hover { text-decoration: none; }
.logo-mark {
  width: 32px; height: 32px; border-radius: 8px;
  background: var(--brand-grad);
  color: #fff; font-weight: 700; font-size: 15px;
  display: flex; align-items: center; justify-content: center;
}
.logo-name { font-weight: 600; font-size: 16px; }
.logo-name small { color: var(--ink-3); font-weight: 400; margin-left: 6px; font-size: 12px; }
.site-nav { display: flex; gap: 4px; margin-left: auto; }
.site-nav a {
  color: var(--ink-2); padding: 6px 14px; border-radius: 999px;
  font-size: 14px;
}
.site-nav a:hover { background: #eef0fa; color: var(--brand); text-decoration: none; }
.site-nav a.active { background: #e9e9fb; color: var(--brand-deep); font-weight: 500; }
.nav-toggle {
  display: none; margin-left: auto; border: 1px solid var(--line);
  background: #fff; border-radius: 8px; width: 38px; height: 34px;
  cursor: pointer; color: var(--ink-2);
}

/* ---------- 界面语言切换按钮 ---------- */
.lang-toggle {
  border: 1px solid var(--line); background: #fff; color: var(--ink-2);
  border-radius: 999px; padding: 6px 13px; font-size: 13px; font-weight: 500;
  font-family: var(--font); cursor: pointer; margin-left: 8px;
  transition: background .12s ease, color .12s ease, border-color .12s ease;
  line-height: 1.4;
}
.lang-toggle:hover { background: #eef0fa; color: var(--brand); }
.lang-toggle:focus-visible { outline: 2px solid var(--brand); outline-offset: 2px; }
.site-nav .lang-toggle { margin-left: 8px; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  border-radius: 10px; padding: 11px 22px;
  font-size: 15px; font-weight: 500; font-family: var(--font);
  cursor: pointer; border: 1px solid transparent;
  transition: transform .12s ease, box-shadow .12s ease;
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--brand); color: #fff; box-shadow: 0 4px 14px rgba(91, 91, 214, .35); }
.btn-primary:hover { background: var(--brand-deep); text-decoration: none; }
.btn-hero { background: #fff; color: var(--brand-deep); padding: 14px 30px; font-size: 16px; }
.btn-hero:hover { text-decoration: none; box-shadow: 0 8px 24px rgba(0, 0, 0, .18); }
.btn-outline { background: transparent; color: var(--brand-deep); border-color: #c9c9f0; }
.btn-outline:hover { background: #f2f2fd; text-decoration: none; }
.btn-sm { padding: 7px 14px; font-size: 13px; border-radius: 8px; }
.btn svg { flex: none; }

/* ---------- Hero ---------- */
.hero {
  background: var(--brand-grad);
  color: #fff;
  padding: 64px 0 72px;
  position: relative;
  overflow: hidden;
}
.hero::after {
  content: ""; position: absolute; right: -120px; top: -120px;
  width: 380px; height: 380px; border-radius: 50%;
  background: rgba(255, 255, 255, .08);
}
.hero::before {
  content: ""; position: absolute; left: -80px; bottom: -160px;
  width: 300px; height: 300px; border-radius: 50%;
  background: rgba(255, 255, 255, .06);
}
.hero .container {
  display: grid; grid-template-columns: 1.05fr .95fr; gap: 48px; align-items: center;
  position: relative; z-index: 1;
}
.hero-kicker {
  display: inline-block; font-size: 13px; letter-spacing: .12em;
  background: rgba(255, 255, 255, .16); border: 1px solid rgba(255, 255, 255, .25);
  padding: 4px 14px; border-radius: 999px; margin-bottom: 18px;
}
.hero h1 { font-size: 40px; line-height: 1.25; font-weight: 700; margin-bottom: 14px; }
.hero-sub { font-size: 17px; color: rgba(255, 255, 255, .85); margin-bottom: 30px; max-width: 30em; }
.hero-cta { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 26px; }
.hero-meta { font-size: 13px; color: rgba(255, 255, 255, .75); }
.hero-meta code {
  font-family: var(--mono); background: rgba(255, 255, 255, .14);
  padding: 2px 8px; border-radius: 6px; font-size: 12px;
}
.hero-meta .copy-hint { margin-left: 8px; cursor: pointer; border-bottom: 1px dashed rgba(255,255,255,.5); }
.hero-meta .copy-hint:hover { color: #fff; }

/* ---------- 界面示意 ---------- */
.app-mock {
  background: #fff; border-radius: 14px; overflow: hidden;
  box-shadow: 0 24px 60px rgba(20, 24, 60, .28);
  color: var(--ink); font-size: 12px;
}
.app-mock-bar {
  background: var(--brand-grad); color: #fff;
  padding: 12px 16px; display: flex; align-items: center; gap: 10px;
}
.app-mock-bar .dot { width: 18px; height: 18px; border-radius: 5px; background: rgba(255,255,255,.28); }
.app-mock-bar b { font-size: 13px; }
.app-mock-bar span { margin-left: auto; font-size: 11px; color: rgba(255,255,255,.8); }
.app-mock-tabs { display: flex; gap: 6px; padding: 10px 14px 0; flex-wrap: wrap; }
.app-mock-tabs i {
  font-style: normal; padding: 4px 12px; border-radius: 999px;
  background: #f0f0f8; color: var(--ink-3); font-size: 11px;
}
.app-mock-tabs i.on { background: #e9e9fb; color: var(--brand-deep); font-weight: 600; }
.app-mock-body { padding: 14px; display: grid; gap: 10px; }
.mock-row { display: flex; align-items: center; gap: 8px; }
.mock-row label { width: 76px; color: var(--ink-2); font-size: 11px; text-align: right; flex: none; }
.mock-input {
  flex: 1; height: 26px; border: 1px solid var(--line); border-radius: 6px;
  background: #fafbfd; color: var(--ink-3); font-size: 11px;
  display: flex; align-items: center; padding: 0 10px;
}
.mock-btn {
  background: var(--brand); color: #fff; border-radius: 7px;
  padding: 6px 16px; font-size: 11px; font-weight: 600; border: none;
}
.mock-table { border: 1px solid var(--line); border-radius: 8px; overflow: hidden; }
.mock-table .tr { display: flex; padding: 6px 12px; gap: 8px; align-items: center; }
.mock-table .tr.hd { background: #f6f7fc; color: var(--ink-3); font-size: 10px; }
.mock-table .tr + .tr { border-top: 1px solid #f0f0f5; }
.mock-table .c { flex: 1; }
.mock-badge { border-radius: 999px; padding: 1px 10px; font-size: 10px; font-weight: 600; }
.mock-badge.ac { background: var(--ac-green-bg); color: var(--ac-green); }
.mock-badge.wa { background: var(--ac-red-bg); color: var(--ac-red); }
.mock-score { margin-top: 2px; font-weight: 700; color: var(--brand-deep); font-size: 13px; }
.app-mock-cap { text-align: center; color: rgba(255,255,255,.65); font-size: 11px; margin-top: 12px; }

/* ---------- 通用区块 ---------- */
.section { padding: 64px 0; }
.section.alt { background: #fff; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.section-head { text-align: center; max-width: 640px; margin: 0 auto 44px; }
.section-head h2 { font-size: 27px; font-weight: 700; margin-bottom: 10px; }
.section-head p { color: var(--ink-2); }

/* ---------- 功能卡片 ---------- */
.features { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.feature-card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 24px; box-shadow: var(--shadow);
}
.feature-card .ic {
  width: 42px; height: 42px; border-radius: 10px;
  display: flex; align-items: center; justify-content: center; margin-bottom: 14px;
  background: #eef0fd; color: var(--brand-deep);
}
.feature-card h3 { font-size: 16px; font-weight: 600; margin-bottom: 6px; }
.feature-card p { font-size: 13.5px; color: var(--ink-2); }

/* ---------- 两种写法 ---------- */
.io-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.io-card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 26px; box-shadow: var(--shadow);
}
.io-card h3 { font-size: 17px; margin-bottom: 8px; display: flex; align-items: center; gap: 8px; }
.io-card h3 .tag {
  font-size: 11px; font-weight: 600; color: var(--brand-deep);
  background: #eef0fd; border-radius: 999px; padding: 2px 10px;
}
.io-card p { color: var(--ink-2); font-size: 14px; margin-bottom: 12px; }
.io-card pre {
  font-family: var(--mono); font-size: 12.5px; line-height: 1.6;
  background: #f6f7fc; border: 1px solid var(--line); border-radius: 8px;
  padding: 14px 16px; overflow-x: auto; color: var(--ink);
}
.io-note {
  margin-top: 20px; background: var(--ac-amber-bg); border: 1px solid #f0dfa8;
  border-radius: 10px; padding: 14px 18px; font-size: 13.5px; color: #6b5300;
}

/* ---------- 快速开始 ---------- */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; counter-reset: step; }
.step {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 26px; position: relative; box-shadow: var(--shadow);
}
.step::before {
  counter-increment: step; content: counter(step);
  width: 34px; height: 34px; border-radius: 50%;
  background: var(--brand-grad); color: #fff; font-weight: 700;
  display: flex; align-items: center; justify-content: center; margin-bottom: 14px;
}
.step h3 { font-size: 16px; margin-bottom: 6px; }
.step p { font-size: 13.5px; color: var(--ink-2); }
.step code, .io-card code, .feature-card code {
  font-family: var(--mono); font-size: .92em; background: #eef0fa;
  padding: 1px 6px; border-radius: 5px; color: var(--brand-deep);
}

/* ---------- FAQ ---------- */
.faq { max-width: 760px; margin: 0 auto; display: grid; gap: 12px; }
.faq details {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 0 20px; box-shadow: var(--shadow);
}
.faq summary {
  cursor: pointer; list-style: none; padding: 16px 0;
  font-weight: 500; font-size: 15px; display: flex; align-items: center; gap: 10px;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::before {
  content: "?"; flex: none; width: 22px; height: 22px; border-radius: 50%;
  background: #eef0fd; color: var(--brand-deep); font-weight: 700; font-size: 12px;
  display: flex; align-items: center; justify-content: center;
}
.faq details[open] summary { color: var(--brand-deep); }
.faq .answer { padding: 0 0 16px 32px; color: var(--ink-2); font-size: 14px; }

/* ---------- 下载区 ---------- */
.download-band {
  background: var(--brand-grad); border-radius: 18px;
  padding: 44px 40px; color: #fff; text-align: center;
  display: grid; gap: 14px; place-items: center;
}
.download-band h2 { font-size: 26px; }
.download-band p { color: rgba(255,255,255,.85); }
.download-band .meta {
  font-size: 13px; color: rgba(255,255,255,.75); font-family: var(--mono);
}

/* ---------- 内页 ---------- */
.page-hero {
  background: var(--brand-grad); color: #fff; padding: 44px 0 48px;
}
.page-hero .container { display: grid; gap: 8px; }
.page-hero h1 { font-size: 30px; }
.page-hero p { color: rgba(255,255,255,.82); font-size: 15px; }
.doc { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); padding: 40px 44px; margin: 40px 0 64px; }
.doc h2 { font-size: 21px; margin: 34px 0 14px; padding-top: 20px; border-top: 1px solid #f0f0f5; }
.doc h2:first-child { margin-top: 0; padding-top: 0; border-top: none; }
.doc h3 { font-size: 16px; margin: 22px 0 8px; }
.doc p { color: var(--ink-2); margin-bottom: 12px; }
.doc ul, .doc ol { margin: 0 0 14px 22px; color: var(--ink-2); display: grid; gap: 6px; }
.doc li strong { color: var(--ink); }
.doc table { width: 100%; border-collapse: collapse; margin: 12px 0 18px; font-size: 13.5px; }
.doc th, .doc td { border: 1px solid var(--line); padding: 8px 12px; text-align: left; vertical-align: top; }
.doc th { background: #f6f7fc; font-weight: 600; }
.doc td code { font-family: var(--mono); font-size: .9em; background: #eef0fa; padding: 1px 6px; border-radius: 5px; color: var(--brand-deep); }
.doc pre {
  font-family: var(--mono); font-size: 13px; line-height: 1.6;
  background: #f6f7fc; border: 1px solid var(--line); border-radius: 8px;
  padding: 16px 18px; overflow-x: auto; margin-bottom: 14px;
}
.doc blockquote {
  border-left: 3px solid var(--brand); background: #f6f7fc;
  padding: 10px 16px; border-radius: 0 8px 8px 0; color: var(--ink-2);
  font-size: 13.5px; margin-bottom: 14px;
}
.doc .toc { background: #f8f9fd; border: 1px solid var(--line); border-radius: 10px; padding: 18px 22px; margin-bottom: 8px; }
.doc .toc b { display: block; margin-bottom: 8px; font-size: 14px; }
.doc .toc ol { margin: 0 0 0 20px; display: grid; gap: 4px; font-size: 14px; }
.doc .toc a { color: var(--brand-deep); }

/* ---------- 更新日志 ---------- */
.timeline { display: grid; gap: 18px; margin: 40px 0 64px; }
.release {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 26px 30px; display: grid;
  grid-template-columns: 150px 1fr; gap: 24px;
}
.release .v { display: grid; gap: 6px; align-content: start; }
.release .v b { font-size: 19px; color: var(--brand-deep); }
.release .v span { font-size: 12.5px; color: var(--ink-3); }
.release .v .cur {
  justify-self: start; font-size: 11px; font-weight: 600; color: var(--ac-green);
  background: var(--ac-green-bg); border-radius: 999px; padding: 2px 10px;
}
.release ul { margin-left: 20px; display: grid; gap: 6px; color: var(--ink-2); font-size: 14px; }
.release .rel-title { font-weight: 600; color: var(--ink); margin-bottom: 6px; font-size: 15px; }

/* ---------- 页脚 ---------- */
.site-footer {
  background: #20223a; color: #a7abc4; padding: 40px 0 32px; font-size: 13.5px;
}
.site-footer .container { display: grid; gap: 24px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 32px; }
.footer-grid h4 { color: #fff; font-size: 14px; margin-bottom: 10px; }
.footer-grid a { color: #a7abc4; display: block; padding: 3px 0; }
.footer-grid a:hover { color: #fff; }
.footer-brand { display: flex; align-items: center; gap: 10px; color: #fff; font-weight: 600; margin-bottom: 10px; }
.footer-bottom { border-top: 1px solid #2e3152; padding-top: 20px; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; color: #7d8199; font-size: 12.5px; }

/* ---------- 截图展示 ---------- */
.shot { margin: 0; }
.shot img {
  display: block; width: 100%; height: auto;
  border-radius: var(--radius); border: 1px solid var(--line);
  box-shadow: var(--shadow); background: #fff;
}
.shot figcaption {
  text-align: center; color: var(--ink-3); font-size: 13px;
  margin-top: 10px; line-height: 1.5;
}
.shot-main { margin-bottom: 22px; }
.shot-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
@media (max-width: 640px) { .shot-grid { grid-template-columns: 1fr; } }

/* ---------- 对拍实验室 ---------- */
.lab-rules { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-bottom: 8px; }
.lab-rules > div { background: #f8f9fd; border: 1px solid var(--line); border-radius: 10px; padding: 16px 20px; }
.lab-rules h3 { font-size: 14px; margin-bottom: 6px; }
.lab-rules p { font-size: 13px; color: var(--ink-2); margin: 0; }
.lab-rules p + p { margin-top: 6px; }
.lab-rules b { color: var(--ink); }

/* 语言选择条 */
.lab-langbar {
  display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
  background: #f8f9fd; border: 1px solid var(--line); border-radius: 10px;
  padding: 12px 16px; margin-bottom: 10px;
}
.lab-langbar-label { font-size: 13px; font-weight: 600; color: var(--ink-2); flex: none; }
.lab-langbar-btns { display: flex; gap: 8px; flex-wrap: wrap; }
.lab-langbar-note { font-size: 12px; color: var(--ink-3); margin-left: auto; }
.lab-lang {
  font-family: var(--font); font-size: 13px; font-weight: 500;
  padding: 6px 14px; border-radius: 999px; cursor: pointer;
  border: 1px solid var(--line); background: #fff; color: var(--ink-2);
  transition: all .15s ease;
}
.lab-lang:hover { border-color: var(--brand); color: var(--brand-deep); }
.lab-lang.on {
  background: var(--brand); border-color: var(--brand); color: #fff;
  box-shadow: 0 2px 8px rgba(79, 70, 229, .25);
}
.lab-lang.off {
  opacity: .45; cursor: not-allowed; border-style: dashed;
  background: #f1f2f6; color: var(--ink-3);
}
.lab-lang.off:hover { border-color: var(--line); color: var(--ink-3); }
.lab-langhint {
  font-size: 12.5px; color: var(--ink-3); margin: 0 0 14px;
  padding: 8px 14px; border-left: 3px solid var(--brand);
  background: rgba(79, 70, 229, .05); border-radius: 0 8px 8px 0;
}
.lab-langhint:not(:empty) { display: block; }

.lab-challenges { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.lab-challenge {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 18px 20px; display: grid; gap: 8px; align-content: start;
  box-shadow: var(--shadow);
}
.lab-challenge b { font-size: 14.5px; }
.lab-ch-bug {
  justify-self: start; font-size: 11px; font-weight: 600;
  color: #993c1d; background: #faece7; border-radius: 999px; padding: 2px 10px;
}
.lab-challenge p { font-size: 13px; color: var(--ink-2); margin: 0; }
.lab-challenge .btn { justify-self: start; margin-top: 4px; }

.lab-editors { display: grid; grid-template-columns: 1fr 1.2fr 1.2fr; gap: 16px; }
.lab-editor { display: grid; gap: 8px; align-content: start; }
.lab-editor label { font-size: 13px; font-weight: 500; color: var(--ink-2); }
.lab-editor textarea {
  width: 100%; font-family: var(--mono); font-size: 12.5px; line-height: 1.55;
  border: 1px solid var(--line); border-radius: 10px; padding: 12px 14px;
  background: #fafbfd; color: var(--ink); resize: vertical;
}
.lab-editor textarea:focus { outline: 2px solid #b9b9ef; outline-offset: 1px; border-color: var(--brand); background: #fff; }

.lab-controls {
  display: flex; align-items: center; gap: 18px; flex-wrap: wrap;
  background: #f8f9fd; border: 1px solid var(--line); border-radius: 10px;
  padding: 14px 18px; margin: 18px 0 22px;
}
.lab-controls label { font-size: 13px; color: var(--ink-2); display: flex; align-items: center; gap: 8px; }
.lab-controls select {
  font-family: var(--font); font-size: 13px; padding: 6px 10px;
  border: 1px solid var(--line); border-radius: 8px; background: #fff; color: var(--ink);
}
.lab-status { font-size: 13px; color: var(--ink-3); font-family: var(--mono); }
.lab-status:not(:empty)::before { content: "❯ "; color: var(--brand); font-weight: 700; }

.lab-sum-bar { font-size: 13.5px; color: var(--ink-2); margin-bottom: 10px; }
.lab-sum-bar b { color: var(--ink); }
.lab-sum-bar b.ok { color: var(--ac-green); }
.lab-sum-bar b.bad { color: var(--ac-red); }
.lab-sum-final {
  font-size: 16px; font-weight: 600; border-radius: 10px; padding: 14px 18px; margin-bottom: 12px;
}
.lab-sum-final.ok { background: var(--ac-green-bg); color: var(--ac-green); border: 1px solid #bfe5cc; }
.lab-sum-final.bad { background: var(--ac-red-bg); color: var(--ac-red); border: 1px solid #f3c2c2; }

.lab-log {
  max-height: 220px; overflow-y: auto; border: 1px solid #262b47; border-radius: 10px;
  background: #10142a; font-size: 12.5px; margin-bottom: 18px;
  font-family: var(--mono);
  box-shadow: 0 4px 14px rgba(16, 20, 42, .18);
}
.lab-log-row { display: flex; gap: 10px; padding: 5px 14px; align-items: baseline; color: #c8d0e8; }
.lab-log-row + .lab-log-row { border-top: 1px solid rgba(255, 255, 255, .05); }
.lab-log-r { flex: none; width: 60px; color: #6b7394; font-family: var(--mono); font-size: 11.5px; }
.lab-log-st { flex: none; width: 76px; font-weight: 600; }
.lab-log-d { color: #8b93b5; font-family: var(--mono); font-size: 11.5px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.lab-log-row.st-OK .lab-log-st { color: #4ade80; }
.lab-log-row.st-DIFF .lab-log-st { color: #f87171; }
.lab-log-row.st-RE .lab-log-st { color: #f87171; }
.lab-log-row.st-TLE .lab-log-st { color: #fbbf24; }

/* ---------- 经典 Bug 博物馆 ---------- */
.lab-museum { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.lab-museum-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 18px 20px; display: grid; gap: 8px; align-content: start;
  box-shadow: var(--shadow); position: relative; overflow: hidden;
}
.lab-museum-card::after {
  content: ""; position: absolute; right: -30px; top: -30px;
  width: 90px; height: 90px; border-radius: 50%;
  background: rgba(91, 91, 214, .06);
}
.lab-museum-head { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.lab-museum-no {
  font-family: var(--mono); font-size: 11px; font-weight: 700; letter-spacing: .08em;
  color: var(--brand-deep); background: #eef0fd; border-radius: 6px; padding: 2px 10px;
}
.lab-museum-card b { font-size: 15px; }
.lab-museum-card p { font-size: 13px; color: var(--ink-2); margin: 0; }
.lab-museum-card .btn { justify-self: start; margin-top: 4px; }
.lab-museum-card code {
  font-family: var(--mono); font-size: .92em; background: #eef0fa;
  padding: 1px 6px; border-radius: 5px; color: var(--brand-deep);
}

.lab-prob-title { font-size: 15px; margin: 4px 0 12px; }
.lab-prob {
  border: 1px solid var(--line); border-radius: 10px; background: #fff;
  margin-bottom: 10px; box-shadow: var(--shadow);
}
.lab-prob summary {
  cursor: pointer; list-style: none; padding: 12px 18px; font-size: 13.5px; font-weight: 500;
}
.lab-prob summary::-webkit-details-marker { display: none; }
.lab-prob summary::before { content: "▸"; color: var(--ink-3); margin-right: 8px; }
.lab-prob[open] summary::before { content: "▾"; }
.lab-prob[open] summary { border-bottom: 1px solid var(--line); color: var(--ac-red); }
.lab-prob-body { padding: 14px 18px; display: grid; gap: 12px; }

/* ---------- 对拍战绩分享卡 ---------- */
.lab-share { margin: 4px 0 16px; }
.lab-share[hidden] { display: none; }
.lab-share-cta {
  display: flex; align-items: center; gap: 16px; flex-wrap: wrap;
  background: linear-gradient(135deg, #eef0fd, #f6f2ff);
  border: 1px dashed #c2bef0; border-radius: 12px; padding: 16px 20px;
}
.lab-share-tip { font-size: 13.5px; color: var(--ink-2); margin: 0; flex: 1; min-width: 240px; line-height: 1.6; }
.lab-share-tip b { color: var(--brand-deep); }
.lab-share-modal {
  position: fixed; inset: 0; z-index: 100;
  background: rgba(15, 18, 40, .6); -webkit-backdrop-filter: blur(4px); backdrop-filter: blur(4px);
  display: flex; align-items: center; justify-content: center; padding: 24px;
}
.lab-share-modal[hidden] { display: none; }
.lab-share-modal-in {
  background: #fff; border-radius: 16px; max-width: 460px; width: 100%;
  box-shadow: 0 30px 80px rgba(10, 12, 40, .4); overflow: hidden;
}
.lab-share-modal-bar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 18px; border-bottom: 1px solid var(--line);
  font-size: 15px; font-weight: 600; color: var(--ink);
}
.lab-share-x {
  border: none; background: #f0f0f8; color: var(--ink-2);
  width: 30px; height: 30px; border-radius: 8px; font-size: 20px; cursor: pointer; line-height: 1;
}
.lab-share-x:hover { background: #e6e6f2; }
.lab-share-canvas-wrap { padding: 16px; background: #f5f6fb; }
.lab-share-canvas-wrap canvas {
  width: 100%; height: auto; border-radius: 10px; box-shadow: 0 8px 24px rgba(20, 24, 60, .18); display: block;
}
.lab-share-actions { display: flex; gap: 12px; justify-content: center; padding: 0 16px 4px; }
.lab-share-note {
  text-align: center; font-size: 12.5px; color: var(--ink-3);
  padding: 6px 16px 16px; margin: 0; min-height: 18px;
}
.lab-io { display: grid; gap: 6px; }
.lab-io-tag {
  justify-self: start; font-size: 11px; font-weight: 600; border-radius: 999px; padding: 2px 10px;
}
.lab-io-tag.in { background: #eef0fd; color: var(--brand-deep); }
.lab-io-tag.m { background: var(--ac-red-bg); color: var(--ac-red); }
.lab-io-tag.b { background: var(--ac-green-bg); color: var(--ac-green); }
.lab-io pre {
  font-family: var(--mono); font-size: 12.5px; line-height: 1.55;
  background: #f6f7fc; border: 1px solid var(--line); border-radius: 8px;
  padding: 10px 14px; overflow-x: auto; white-space: pre-wrap; word-break: break-all;
}

/* ---------- 下载区 ---------- */
.dl-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; width: 100%; max-width: 880px; margin: 10px 0 6px; }
.dl-card {
  background: #fff; color: var(--ink); border-radius: 12px;
  padding: 20px 18px; display: grid; gap: 7px; justify-items: center; text-align: center;
  box-shadow: 0 8px 24px rgba(20, 24, 60, .18);
}
.dl-os {
  font-size: 11px; font-weight: 600; letter-spacing: .1em;
  color: var(--brand-deep); background: #eef0fd; border-radius: 999px; padding: 2px 12px;
}
.dl-card b { font-size: 15px; }
.dl-card p { font-size: 12.5px; color: var(--ink-2); margin: 0; }
.dl-card .btn { margin-top: 4px; }
.dl-note { font-size: 12.5px; color: rgba(255, 255, 255, .78); line-height: 1.7; }
.dl-note a { color: #fff; text-decoration: underline; }
.dl-note code { font-family: var(--mono); font-size: 11.5px; }
@media (max-width: 720px) { .dl-grid { grid-template-columns: 1fr; } }

/* ---------- 响应式 ---------- */
@media (max-width: 920px) {
  .hero .container { grid-template-columns: 1fr; }
  .hero h1 { font-size: 31px; }
  .features, .steps { grid-template-columns: 1fr 1fr; }
  .io-grid { grid-template-columns: 1fr; }
  .release { grid-template-columns: 1fr; gap: 10px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .lab-rules, .lab-editors { grid-template-columns: 1fr; }
  .lab-challenges, .lab-museum { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  .site-nav {
    display: none; position: absolute; top: 60px; left: 0; right: 0;
    background: #fff; border-bottom: 1px solid var(--line);
    flex-direction: column; padding: 10px 16px 16px; gap: 2px;
  }
  .site-nav.open { display: flex; }
  .nav-toggle { display: flex; align-items: center; justify-content: center; }
  .lang-toggle { margin-left: auto; }
  .site-nav .lang-toggle { margin-left: 0; align-self: flex-start; }
  .site-header .container { gap: 12px; }
  .features, .steps { grid-template-columns: 1fr; }
  .section { padding: 44px 0; }
  .doc { padding: 26px 22px; }
  .footer-grid { grid-template-columns: 1fr; }
  .download-band { padding: 32px 22px; }
  .lab-challenges, .lab-museum { grid-template-columns: 1fr; }
  .lab-controls { gap: 12px; }
}

/* 首页 iframe 嵌入时，只留对拍工作台（裁掉站头/页头/页脚） */
body.lab-embed .site-header,
body.lab-embed .page-hero,
body.lab-embed .site-footer { display: none !important; }
body.lab-embed { padding-top: 0; }

/* 首页对拍实验室实时预览 */
.lab-preview {
  margin: 8px 0 4px;
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid var(--line);
  box-shadow: 0 16px 44px rgba(31, 38, 79, .12);
  background: #0f172a;
}
.lab-preview iframe {
  display: block;
  width: 100%;
  height: 660px;
  border: 0;
}
.lab-preview-cap {
  text-align: center;
  font-size: 13px;
  color: var(--ink-2);
  margin: 12px 0 0;
}
.lab-preview-cap a { color: var(--brand); }
@media (max-width: 720px) {
  .lab-preview iframe { height: 720px; }
}