/* searchpipe 设计系统 —— 双主题（浅色默认，[data-theme="dark"] 深色）
   令牌 → 基础 → 组件 → 布局（控制台侧边栏 / 营销页） */

/* ---------- 设计令牌 ---------- */
:root {
  --bg: #f8f9fb;
  --surface: #ffffff;
  --surface-2: #f1f2f5;
  --border: #e5e7eb;
  --border-strong: #d1d5db;
  --txt: #111827;
  --muted: #5f6b7a;
  --faint: #9aa3b2;
  --accent: #4f46e5;
  --accent-hover: #4338ca;
  --accent-soft: #eef0fe;
  --on-accent: #ffffff;
  --ok: #16a34a;
  --ok-soft: #e8f7ee;
  --warn: #b45309;
  --warn-soft: #fdf3e3;
  --err: #dc2626;
  --err-soft: #fdecec;
  --code-bg: #0f172a;
  --code-txt: #e2e8f0;
  --shadow-sm: 0 1px 2px rgba(16, 24, 40, .06);
  --shadow-md: 0 4px 12px rgba(16, 24, 40, .08);
  --shadow-lg: 0 12px 32px rgba(16, 24, 40, .12);
  --radius-sm: 8px;
  --radius: 12px;
  --radius-lg: 16px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
}

[data-theme="dark"] {
  --bg: #0b0d12;
  --surface: #14161d;
  --surface-2: #1b1e27;
  --border: #262a35;
  --border-strong: #363b49;
  --txt: #e7e9ef;
  --muted: #9aa3b2;
  --faint: #646c7c;
  --accent: #818cf8;
  --accent-hover: #a5b0fb;
  --accent-soft: #23253a;
  --on-accent: #0b0d12;
  --ok: #3dd68c;
  --ok-soft: #16301f;
  --warn: #f5b45c;
  --warn-soft: #33270f;
  --err: #ff8585;
  --err-soft: #3a1c1c;
  --code-bg: #0a0f1e;
  --code-txt: #dbe2f0;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, .4);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, .45);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, .55);
}

/* ---------- 基础 ---------- */
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--txt);
  line-height: 1.6;
  font-size: 15px;
  transition: background .2s, color .2s;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3, h4 { line-height: 1.3; margin: 0; }
code { font-family: var(--mono); font-size: .9em; background: var(--surface-2); border-radius: 5px; padding: 1px 6px; }
pre code { background: none; padding: 0; }
::selection { background: var(--accent-soft); }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 7px;
  padding: 9px 18px; border-radius: var(--radius-sm); border: 1px solid transparent;
  background: var(--accent); color: var(--on-accent);
  font: 600 14px/1.2 var(--font); cursor: pointer; white-space: nowrap;
  transition: background .15s, border-color .15s, color .15s, box-shadow .15s;
}
.btn:hover { background: var(--accent-hover); text-decoration: none; }
.btn:disabled { opacity: .5; cursor: default; }
.btn-ghost { background: transparent; border-color: var(--border-strong); color: var(--txt); }
.btn-ghost:hover { background: var(--surface-2); }
.btn-danger { background: transparent; border-color: var(--err); color: var(--err); }
.btn-danger:hover { background: var(--err-soft); }
.btn-sm { padding: 5px 12px; font-size: 13px; }
.btn-lg { padding: 13px 26px; font-size: 15px; border-radius: 10px; }
.btn-block { width: 100%; }

/* ---------- 表单 ---------- */
.input, input[type=text], input[type=email], input[type=password],
input[type=tel], input[type=number], select {
  width: 100%; padding: 10px 13px; border-radius: var(--radius-sm);
  border: 1px solid var(--border-strong); background: var(--surface);
  color: var(--txt); font: 400 14px/1.4 var(--font); outline: none;
  transition: border-color .15s, box-shadow .15s;
}
.input:focus, input:focus, select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 18%, transparent);
}
input::placeholder { color: var(--faint); }
label { font-size: 13px; font-weight: 600; color: var(--muted); }

/* ---------- 卡片 / 标签 / 表格 ---------- */
.card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 22px 24px; box-shadow: var(--shadow-sm);
}
.card + .card { margin-top: 18px; }
.card h2 { font-size: 16px; margin-bottom: 4px; }
.card .card-sub { color: var(--muted); font-size: 13px; margin: 0 0 16px; }

.tag {
  display: inline-flex; align-items: center; padding: 2px 10px;
  border-radius: 999px; font-size: 12px; font-weight: 600;
}
.tag-ok { background: var(--ok-soft); color: var(--ok); }
.tag-err { background: var(--err-soft); color: var(--err); }
.tag-warn { background: var(--warn-soft); color: var(--warn); }
.tag-neutral { background: var(--surface-2); color: var(--muted); }

.table-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); }
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { text-align: left; padding: 11px 16px; border-bottom: 1px solid var(--border); }
th { color: var(--muted); font-weight: 600; font-size: 12px; text-transform: uppercase; letter-spacing: .05em; background: var(--surface-2); }
tbody tr:last-child td { border-bottom: 0; }
tbody tr:hover { background: var(--surface-2); }

/* ---------- 消息 / 提示 ---------- */
.msg { padding: 11px 15px; border-radius: var(--radius-sm); margin: 12px 0; font-size: 14px; }
.msg-ok { background: var(--ok-soft); color: var(--ok); }
.msg-err { background: var(--err-soft); color: var(--err); }
.msg-warn { background: var(--warn-soft); color: var(--warn); }
.muted { color: var(--muted); }
.faint { color: var(--faint); }
.empty { padding: 34px 20px; text-align: center; color: var(--faint); font-size: 14px; }

/* ---------- 代码块（恒深色） ---------- */
.code-block {
  position: relative; background: var(--code-bg); color: var(--code-txt);
  border-radius: var(--radius); padding: 16px 18px; overflow-x: auto;
  font-family: var(--mono); font-size: 13px; line-height: 1.65;
}
.code-block pre { margin: 0; }
.code-block .copy-btn {
  position: absolute; top: 10px; right: 10px; padding: 4px 10px;
  background: rgba(255, 255, 255, .08); color: #cbd5e1; border: 1px solid rgba(255, 255, 255, .14);
  border-radius: 6px; font: 500 12px var(--font); cursor: pointer;
}
.code-block .copy-btn:hover { background: rgba(255, 255, 255, .16); }

/* ---------- Tab ---------- */
.tabs { display: flex; gap: 4px; background: var(--surface-2); border-radius: 10px; padding: 4px; }
.tabs button {
  flex: 1; padding: 8px 14px; border: 0; border-radius: 7px; background: transparent;
  color: var(--muted); font: 600 13px var(--font); cursor: pointer;
}
.tabs button.active { background: var(--surface); color: var(--txt); box-shadow: var(--shadow-sm); }

/* ---------- 统计卡 ---------- */
.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 16px; }
.stat-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 18px 20px; box-shadow: var(--shadow-sm);
}
.stat-card .stat-label { color: var(--muted); font-size: 13px; margin-bottom: 6px; }
.stat-card .stat-value { font-size: 28px; font-weight: 700; letter-spacing: -.02em; font-variant-numeric: tabular-nums; }
.stat-card .stat-hint { color: var(--faint); font-size: 12px; margin-top: 4px; }

/* ---------- 控制台布局（侧边栏） ---------- */
.shell { display: flex; min-height: 100vh; }
.sidebar {
  width: 232px; flex-shrink: 0; position: sticky; top: 0; height: 100vh;
  display: flex; flex-direction: column;
  background: var(--surface); border-right: 1px solid var(--border);
  padding: 20px 14px;
}
.sidebar .brand {
  display: flex; align-items: center; gap: 9px; padding: 4px 10px 18px;
  font-size: 17px; font-weight: 700; letter-spacing: -.01em;
}
.sidebar .brand a { color: var(--txt); }
.sidebar .brand a:hover { text-decoration: none; }
.side-nav { display: flex; flex-direction: column; gap: 2px; flex: 1; }
.side-nav a {
  display: flex; align-items: center; gap: 10px; padding: 9px 12px;
  border-radius: var(--radius-sm); color: var(--muted);
  font-size: 14px; font-weight: 500;
}
.side-nav a:hover { background: var(--surface-2); color: var(--txt); text-decoration: none; }
.side-nav a.active { background: var(--accent-soft); color: var(--accent); font-weight: 600; }
.side-nav a svg { width: 17px; height: 17px; flex-shrink: 0; }
.side-foot { border-top: 1px solid var(--border); padding-top: 12px; display: flex; flex-direction: column; gap: 8px; }
.side-user { padding: 6px 12px; font-size: 13px; color: var(--muted); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.main { flex: 1; min-width: 0; }
.main-inner { max-width: 1020px; margin: 0 auto; padding: 32px 28px 72px; }
.page-head { margin-bottom: 24px; }
.page-head h1 { font-size: 22px; font-weight: 700; letter-spacing: -.01em; }
.page-head p { color: var(--muted); font-size: 14px; margin: 5px 0 0; }

/* 主题切换按钮 */
.theme-toggle {
  display: inline-flex; align-items: center; gap: 8px; padding: 8px 12px;
  background: transparent; border: 1px solid var(--border); border-radius: var(--radius-sm);
  color: var(--muted); font: 500 13px var(--font); cursor: pointer; width: 100%;
}
.theme-toggle:hover { background: var(--surface-2); color: var(--txt); }
.theme-toggle svg { width: 15px; height: 15px; }

/* 顶栏（移动端） */
.topbar { display: none; }

/* ---------- 营销首页 ---------- */
.site-nav {
  position: sticky; top: 0; z-index: 20;
  display: flex; align-items: center; gap: 28px;
  padding: 0 28px; height: 62px;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.site-nav .brand { font-size: 17px; font-weight: 700; color: var(--txt); }
.site-nav .brand:hover { text-decoration: none; }
/* 品牌图标（钥匙形 logo，随文字颜色 currentColor） */
.brand-mark { width: 1.15em; height: 1.15em; flex: none; vertical-align: -0.2em; margin-right: .3em; }
.site-nav .nav-links { display: flex; gap: 22px; flex: 1; }
.site-nav .nav-links a { color: var(--muted); font-size: 14px; font-weight: 500; }
.site-nav .nav-links a:hover { color: var(--txt); text-decoration: none; }
.site-nav .nav-actions { display: flex; gap: 10px; align-items: center; }

.hero { max-width: 860px; margin: 0 auto; padding: 88px 24px 56px; text-align: center; }
.hero .eyebrow {
  display: inline-block; padding: 4px 14px; border-radius: 999px;
  background: var(--accent-soft); color: var(--accent);
  font-size: 13px; font-weight: 600; margin-bottom: 20px;
}
.hero h1 { font-size: clamp(30px, 5vw, 46px); font-weight: 800; letter-spacing: -.03em; }
.hero .lead { color: var(--muted); font-size: 17px; max-width: 620px; margin: 18px auto 30px; }
.hero .cta-row { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.hero .hero-code { max-width: 680px; margin: 44px auto 0; text-align: left; box-shadow: var(--shadow-lg); }

.section { max-width: 1040px; margin: 0 auto; padding: 56px 24px; }
.section-head { text-align: center; margin-bottom: 40px; }
.section-head h2 { font-size: 28px; font-weight: 800; letter-spacing: -.02em; }
.section-head p { color: var(--muted); margin: 10px auto 0; max-width: 560px; }
.feature-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 18px; align-items: stretch; }
.feature {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 22px; box-shadow: var(--shadow-sm);
  display: flex; flex-direction: column;
}
.feature p { flex: 1; }

/* 落地页「代码 + 要点」双栏：左栏代码块，右栏要点卡，顶底对齐 */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; align-items: stretch; }
.split-col { display: flex; flex-direction: column; gap: 22px; min-width: 0; }
.code-label { font-size: 13px; font-weight: 600; color: var(--muted); margin: 0 0 8px; }
.feature-stack { display: flex; flex-direction: column; gap: 14px; }
.section-note { text-align: center; color: var(--muted); font-size: 13px; margin-top: 26px; }
.plans-head { margin-top: 48px; }
.faq-narrow { max-width: 760px; margin: 0 auto; }
.cta-band .cta-row { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

/* MCP setup 区块：代码块居中堆叠在上，3 张要点卡横排成一行在下 */
.mcp-codes { max-width: 680px; margin: 0 auto; display: flex; flex-direction: column; gap: 22px; }
.mcp-features { grid-template-columns: repeat(3, 1fr); margin-top: 28px; }
.feature .f-icon {
  width: 38px; height: 38px; border-radius: 10px; display: flex; align-items: center; justify-content: center;
  background: var(--accent-soft); color: var(--accent); margin-bottom: 14px;
}
.feature h3 { font-size: 15px; margin-bottom: 6px; }
.feature p { color: var(--muted); font-size: 13.5px; margin: 0; }
.pipeline { display: flex; align-items: stretch; gap: 0; flex-wrap: wrap; justify-content: center; }
.pipeline .step {
  flex: 1; min-width: 180px; background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 18px 20px; margin: 6px;
}
.pipeline .step .step-no { color: var(--accent); font: 700 12px var(--mono); letter-spacing: .08em; }
.pipeline .step h3 { font-size: 15px; margin: 6px 0 4px; }
.pipeline .step p { color: var(--muted); font-size: 13px; margin: 0; }

.pricing-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 18px; max-width: 760px; margin: 0 auto; }
.price-card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-lg);
  padding: 26px; text-align: center; box-shadow: var(--shadow-sm);
}
.price-card.featured { border-color: var(--accent); box-shadow: var(--shadow-md); }
/* ---------- 折扣展示（全站统一：徽章 + 划线基准价，现价在前、划线价在后） ---------- */
.price-badge { margin-bottom: 8px; }
.discount-badge {
  display: inline-block; background: #ff4d4f; color: #fff; font-size: 12px; font-weight: 700;
  padding: 3px 10px; border-radius: 999px; letter-spacing: .03em; vertical-align: middle;
}
.discount-badge.badge-pulse { animation: pulse-badge 2s ease-in-out infinite; }
@keyframes pulse-badge { 0%,100%{ opacity:1; } 50%{ opacity:.7; } }
/* 现价与划线价必须同处一行——窄卡片（充值档 minmax(200px)）里换行会让三张卡内容错位 */
.price-original { text-decoration: line-through; color: var(--faint); font-weight: 500; margin-left: 5px; }
.price .price-original { font-size: 13px; }
.rate-text .price-original { font-size: 15px; }
.price-discounted { color: var(--ok); font-weight: 800; }
.rate-highlight { background: linear-gradient(135deg, rgba(255,77,79,.08), rgba(255,77,79,.02)); border: 1px solid rgba(255,77,79,.2); border-radius: var(--radius); padding: 14px 20px; margin: 12px 0; display: inline-flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.rate-highlight .rate-text { font-size: 18px; font-weight: 700; }
.price-card .price { font-size: 30px; font-weight: 800; letter-spacing: -.02em; margin: 10px 0 2px; white-space: nowrap; }
.price-card .price .per { font-size: 14px; color: var(--faint); font-weight: 600; }
.section-note.tight { margin-top: 18px; }
.price-card ul { list-style: none; padding: 0; margin: 18px 0; color: var(--muted); font-size: 14px; }
.price-card ul li { padding: 5px 0; }

.site-footer {
  border-top: 1px solid var(--border); padding: 34px 24px;
  text-align: center; color: var(--faint); font-size: 13px;
}

/* ---------- 登录页 ---------- */
.auth-wrap { min-height: 100vh; display: flex; align-items: center; justify-content: center; padding: 24px; }
.auth-card { width: 100%; max-width: 400px; }
.auth-card .auth-brand { text-align: center; margin-bottom: 26px; }
.auth-card .auth-brand .logo { font-size: 24px; font-weight: 800; letter-spacing: -.02em; }
.auth-card .auth-brand p { color: var(--muted); font-size: 14px; margin: 6px 0 0; }
.divider { display: flex; align-items: center; gap: 12px; color: var(--faint); font-size: 12px; margin: 18px 0; }
.divider::before, .divider::after { content: ""; flex: 1; height: 1px; background: var(--border); }
.oauth-btn {
  display: flex; align-items: center; justify-content: center; gap: 9px; width: 100%;
  padding: 10px; border: 1px solid var(--border-strong); border-radius: var(--radius-sm);
  background: var(--surface); color: var(--txt); font: 600 14px var(--font); cursor: pointer;
}
.oauth-btn:hover { background: var(--surface-2); text-decoration: none; }
.auth-foot { text-align: center; margin-top: 20px; font-size: 13px; color: var(--faint); }
.auth-links { display: flex; justify-content: space-between; margin-top: 14px; font-size: 13px; }
.form-error { background: var(--err-soft); color: var(--err); font-size: 13px; padding: 10px 12px; border-radius: var(--radius-sm); margin-bottom: 14px; }
.form-ok { background: var(--ok-soft); color: var(--ok); font-size: 13px; padding: 10px 12px; border-radius: var(--radius-sm); margin-bottom: 14px; }

/* ---------- 模态 ---------- */
.modal-mask {
  position: fixed; inset: 0; z-index: 50; display: none;
  background: rgba(10, 12, 18, .5); backdrop-filter: blur(3px);
  align-items: center; justify-content: center; padding: 20px;
}
.modal-mask.open { display: flex; }
.modal {
  width: 100%; max-width: 520px; background: var(--surface);
  border: 1px solid var(--border); border-radius: var(--radius-lg);
  padding: 26px 28px; box-shadow: var(--shadow-lg);
}
.modal h3 { font-size: 17px; margin-bottom: 6px; }

/* ---------- 工具类 ---------- */
p.card-sub { color: var(--muted); font-size: 13px; }
.row { display: flex; gap: 10px; align-items: center; }
.row > .grow { flex: 1; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.mt { margin-top: 18px; }
.mb { margin-bottom: 18px; }
.mono { font-family: var(--mono); font-size: 13px; }
.text-ok { color: var(--ok); }
.text-err { color: var(--err); }

/* ---------- 加载态 ---------- */
.spinner {
  display: inline-block; width: 14px; height: 14px; vertical-align: -2px;
  border: 2px solid var(--border); border-top-color: var(--accent);
  border-radius: 50%; animation: spin .8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------- 落地页在线体验 ---------- */
.hero-demo { display: flex; gap: 10px; max-width: 640px; margin: 28px auto 0; }
.hero-demo input { flex: 1; }
.hero-demo .btn { flex-shrink: 0; }
.hero-demo-hint { color: var(--faint); font-size: 13px; margin: 10px 0 0; }

/* ---------- 公开内容页（SEO 落地页：/docs /mcp-server /pricing /faq） ---------- */
.site-nav .nav-links a.active { color: var(--accent); font-weight: 600; }
.page-wrap { max-width: 1000px; margin: 0 auto; padding: 40px 24px 64px; }
.page-wrap.narrow { max-width: 800px; }
.breadcrumb { font-size: 13px; color: var(--faint); margin-bottom: 16px; }
.breadcrumb a { color: var(--muted); }
.breadcrumb span[aria-hidden] { margin: 0 6px; }
.doc-layout { display: grid; grid-template-columns: 210px minmax(0, 1fr); gap: 32px; align-items: start; }
.doc-toc { position: sticky; top: 82px; font-size: 13.5px; }
.doc-toc ol { list-style: none; padding: 0; margin: 10px 0 0; }
.doc-toc li { padding: 3px 0; }
.doc-toc a { color: var(--muted); }
.doc-toc a:hover { color: var(--accent); }
.prose > h2 {
  font-size: 21px; font-weight: 700; letter-spacing: -.01em;
  margin: 38px 0 12px; padding-top: 6px;
}
.prose > h2:first-child { margin-top: 0; }
.prose > h3 { font-size: 16.5px; margin: 26px 0 8px; }
.prose p, .prose li { color: var(--muted); font-size: 14.5px; line-height: 1.85; }
.prose ul, .prose ol { padding-left: 22px; margin: 10px 0; }
.prose li { margin: 5px 0; }
.prose strong { color: var(--txt); }
.faq-list { display: grid; gap: 12px; }
.faq-item {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 18px 20px; box-shadow: var(--shadow-sm);
}
.faq-item h3 { font-size: 15.5px; margin-bottom: 8px; }
.faq-item p { color: var(--muted); font-size: 14px; margin: 0; line-height: 1.8; }
.steps { counter-reset: step; display: grid; gap: 14px; }
.step-card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 18px 20px 18px 56px; position: relative; box-shadow: var(--shadow-sm);
}
.step-card::before {
  counter-increment: step; content: counter(step);
  position: absolute; left: 18px; top: 17px;
  width: 24px; height: 24px; border-radius: 50%;
  background: var(--accent-soft); color: var(--accent);
  font: 700 12px var(--mono); display: flex; align-items: center; justify-content: center;
}
.step-card h3 { font-size: 15.5px; margin-bottom: 6px; }
.step-card p { color: var(--muted); font-size: 13.5px; margin: 0 0 10px; }
.cta-band {
  max-width: 1000px; margin: 8px auto 0; padding: 30px 24px; text-align: center;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-lg);
}
.cta-band h2 { font-size: 20px; margin-bottom: 8px; }
.cta-band p { color: var(--muted); font-size: 14px; margin: 0 0 18px; }
.site-footer .footer-cols {
  display: grid; grid-template-columns: 1.7fr 1fr 1fr 1fr; gap: 26px;
  max-width: 1000px; margin: 0 auto 24px; text-align: left;
}
.footer-cols p { font-size: 13px; color: var(--faint); margin: 8px 0 0; max-width: 340px; line-height: 1.7; }
.footer-cols nav { display: flex; flex-direction: column; gap: 9px; }
.footer-cols .footer-head { font-weight: 700; color: var(--txt); font-size: 13px; }
.footer-cols a { color: var(--muted); font-size: 13px; }
.footer-note { max-width: 1000px; margin: 0 auto; padding-top: 18px; border-top: 1px solid var(--border); }

/* ---------- 响应式 ---------- */
@media (max-width: 900px) {
  .shell { flex-direction: column; }
  .sidebar { display: none; }
  .topbar {
    display: flex; align-items: center; gap: 14px; padding: 12px 18px;
    background: var(--surface); border-bottom: 1px solid var(--border);
    position: sticky; top: 0; z-index: 30; overflow-x: auto;
  }
  .topbar .brand { font-weight: 700; font-size: 15px; white-space: nowrap; }
  .topbar a { color: var(--muted); font-size: 13.5px; white-space: nowrap; }
  .topbar a.active { color: var(--accent); font-weight: 600; }
  .main-inner { padding: 22px 16px 56px; }
  .grid2 { grid-template-columns: 1fr; }
  .split { grid-template-columns: 1fr; gap: 22px; }
  .mcp-features { grid-template-columns: 1fr; }
  .site-nav .nav-links { display: none; }
  .doc-layout { grid-template-columns: 1fr; }
  .doc-toc { position: static; }
  .site-footer .footer-cols { grid-template-columns: 1fr 1fr; }
}