/* =========================================================
   1000VPS · 2026 海外 VPS 推荐指南 — 共享样式
   布局参考：blog.naibabiji.com/bestvps（榜单卡片 + 场景速览 + 套餐区 + FAQ）
   ========================================================= */

:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --primary-light: #dbeafe;
  --primary-soft: #eff6ff;
  --accent: #f59e0b;
  --accent-soft: #fef3c7;
  --green: #16a34a;
  --green-soft: #dcfce7;
  --red: #dc2626;
  --red-soft: #fee2e2;
  --bg: #f6f8fb;
  --card: #ffffff;
  --ink: #0f172a;
  --ink-2: #1e293b;
  --muted: #64748b;
  --border: #e5eaf1;
  --gold: #c9971c;
  --gold-bg: #fdf6e3;
  --silver: #7c8aa0;
  --bronze: #b8784f;
  --radius: 14px;
  --radius-sm: 10px;
  --shadow: 0 1px 2px rgba(15, 23, 42, .04), 0 10px 30px -18px rgba(15, 23, 42, .18);
  --shadow-hover: 0 2px 4px rgba(15, 23, 42, .05), 0 18px 44px -18px rgba(37, 99, 235, .28);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB",
          "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --mono: "SF Mono", "Cascadia Code", Consolas, "Courier New", monospace;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

img, svg { max-width: 100%; display: block; }
a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--primary-dark); }

.container { max-width: 1180px; margin: 0 auto; padding: 0 20px; }
.container--narrow { max-width: 900px; }

/* ---------------------------------------------------------
   顶部导航
--------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, .86);
  backdrop-filter: saturate(1.6) blur(12px);
  -webkit-backdrop-filter: saturate(1.6) blur(12px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  height: 64px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 19px;
  color: var(--ink);
  letter-spacing: -.02em;
  white-space: nowrap;
}
.brand:hover { color: var(--ink); }
.brand-badge {
  width: 34px; height: 34px;
  border-radius: 9px;
  background: linear-gradient(135deg, var(--primary), #7c3aed);
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: none;
}
.brand small {
  display: block;
  font-size: 11px;
  font-weight: 500;
  color: var(--muted);
  letter-spacing: 0;
  line-height: 1.2;
}

.main-nav { display: flex; align-items: center; gap: 4px; }
.main-nav a {
  padding: 8px 14px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 500;
  color: var(--ink-2);
  transition: background .18s, color .18s;
  white-space: nowrap;
}
.main-nav a:hover { background: var(--primary-soft); color: var(--primary-dark); }
.main-nav a.active { background: var(--primary); color: #fff; font-weight: 600; }

.header-cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--ink);
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  padding: 9px 16px;
  border-radius: 999px;
  white-space: nowrap;
  transition: background .18s;
}
.header-cta:hover { background: #000; color: #fff; }

.nav-toggle {
  display: none;
  border: 1px solid var(--border);
  background: #fff;
  border-radius: 10px;
  width: 42px; height: 42px;
  cursor: pointer;
  align-items: center;
  justify-content: center;
}
.nav-toggle svg { width: 22px; height: 22px; stroke: var(--ink); }

/* ---------------------------------------------------------
   首页 Hero
--------------------------------------------------------- */
.hero {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(900px 420px at 12% -10%, rgba(37, 99, 235, .14), transparent 60%),
    radial-gradient(800px 420px at 88% 0%, rgba(124, 58, 237, .12), transparent 60%),
    linear-gradient(180deg, #fbfdff 0%, var(--bg) 100%);
  border-bottom: 1px solid var(--border);
  padding: 64px 0 56px;
}

.hero-inner { max-width: 860px; margin: 0 auto; text-align: center; }

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: #fff;
  border: 1px solid var(--border);
  color: var(--primary-dark);
  font-size: 13.5px;
  font-weight: 600;
  padding: 7px 16px;
  border-radius: 999px;
  box-shadow: var(--shadow);
}
.hero-tag .dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 3px rgba(22, 163, 74, .18);
}

.hero h1 {
  margin: 22px 0 16px;
  font-size: clamp(30px, 5vw, 46px);
  line-height: 1.25;
  font-weight: 800;
  letter-spacing: -.02em;
}
.hero h1 .grad {
  background: linear-gradient(92deg, var(--primary), #7c3aed);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-desc {
  font-size: 17px;
  color: var(--muted);
  max-width: 760px;
  margin: 0 auto;
}
.hero-desc strong { color: var(--ink-2); }

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin-top: 26px;
}
.hero-meta span {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 7px 15px;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--ink-2);
  box-shadow: 0 1px 2px rgba(15, 23, 42, .04);
}
.hero-actions { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px; margin-top: 30px; }

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 26px;
  border-radius: 999px;
  font-size: 15.5px;
  font-weight: 600;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform .15s, box-shadow .15s, background .15s, color .15s;
  font-family: inherit;
}
.btn--primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  box-shadow: 0 10px 24px -10px rgba(37, 99, 235, .55);
}
.btn--primary:hover { color: #fff; transform: translateY(-2px); box-shadow: 0 14px 30px -10px rgba(37, 99, 235, .6); }
.btn--ghost { background: #fff; border-color: var(--border); color: var(--ink-2); }
.btn--ghost:hover { border-color: var(--primary); color: var(--primary-dark); transform: translateY(-2px); }
.btn--sm { padding: 8px 18px; font-size: 14px; }
.btn--dark { background: var(--ink); color: #fff; }
.btn--dark:hover { background: #000; color: #fff; transform: translateY(-2px); }

/* ---------------------------------------------------------
   页面 Hero（子页面）
--------------------------------------------------------- */
.page-hero {
  background:
    radial-gradient(700px 320px at 8% -20%, rgba(37, 99, 235, .12), transparent 60%),
    linear-gradient(180deg, #fbfdff, var(--bg));
  border-bottom: 1px solid var(--border);
  padding: 44px 0 38px;
}
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 13.5px;
  color: var(--muted);
  margin-bottom: 14px;
}
.breadcrumb a { color: var(--muted); }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb .sep { color: #b6c2d2; }
.page-hero h1 { font-size: clamp(26px, 4vw, 36px); font-weight: 800; letter-spacing: -.02em; }
.page-hero .lead { margin-top: 10px; color: var(--muted); max-width: 820px; font-size: 16px; }
.page-hero .page-meta { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 18px; }
.page-meta span {
  background: #fff; border: 1px solid var(--border);
  border-radius: 999px; padding: 5px 14px;
  font-size: 13px; font-weight: 600; color: var(--ink-2);
}

/* ---------------------------------------------------------
   快速选择建议（4 卡片）
--------------------------------------------------------- */
.quick-tips {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}
.quick-tip {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px 20px;
  box-shadow: var(--shadow);
  transition: transform .18s, box-shadow .18s, border-color .18s;
}
.quick-tip:hover { transform: translateY(-3px); box-shadow: var(--shadow-hover); border-color: #c7d7f5; }
.quick-tip .qt-icon {
  width: 42px; height: 42px;
  border-radius: 11px;
  display: flex; align-items: center; justify-content: center;
  font-size: 21px;
  margin-bottom: 12px;
  background: var(--primary-soft);
}
.quick-tip h3 { font-size: 16.5px; font-weight: 700; margin-bottom: 6px; }
.quick-tip p { font-size: 14px; color: var(--muted); line-height: 1.7; }
.quick-tip.tone-green .qt-icon { background: var(--green-soft); }
.quick-tip.tone-amber .qt-icon { background: var(--accent-soft); }
.quick-tip.tone-purple .qt-icon { background: #ede9fe; }

/* ---------------------------------------------------------
   通用 Section
--------------------------------------------------------- */
.section { padding: 64px 0; }
.section--alt { background: #fff; border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.section-head { max-width: 780px; margin: 0 auto 36px; text-align: center; }
.section-head .eyebrow {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--primary);
  background: var(--primary-soft);
  border-radius: 999px;
  padding: 5px 14px;
  margin-bottom: 14px;
}
.section-head h2 { font-size: clamp(24px, 3.4vw, 32px); font-weight: 800; letter-spacing: -.02em; }
.section-head p { margin-top: 10px; color: var(--muted); font-size: 16px; }

/* ---------------------------------------------------------
   排行卡片（榜单）— 参考 naibabiji 榜单样式
--------------------------------------------------------- */
.rank-list { display: flex; flex-direction: column; gap: 18px; max-width: 980px; margin: 0 auto; }

.rank-card {
  position: relative;
  display: grid;
  grid-template-columns: minmax(160px, auto) minmax(0, 1fr) auto;
  gap: 22px;
  align-items: center;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px 26px;
  box-shadow: var(--shadow);
  transition: transform .18s, box-shadow .18s, border-color .18s;
}
.rank-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-hover); border-color: #c7d7f5; }
.rank-head-m { display: flex; align-items: center; gap: 18px; }

.rank-num {
  width: 56px; height: 56px;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 24px; font-weight: 800;
  background: #eef2f8;
  color: var(--ink-2);
  border: 2px solid #e2e8f0;
}
.rank-num.n1 { background: var(--gold-bg); color: var(--gold); border-color: #ecd9a0; }
.rank-num.n2 { background: #f1f4f8; color: var(--silver); border-color: #d5dce5; }
.rank-num.n3 { background: #faf1ea; color: var(--bronze); border-color: #e4c5ae; }

.rank-logo {
  width: 88px; height: 88px;
  border-radius: 20px;
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  color: #fff;
  font-weight: 800;
  font-size: 26px;
  letter-spacing: -.02em;
  box-shadow: 0 8px 20px -8px rgba(15, 23, 42, .35);
  flex: none;
}
.rank-logo small { font-size: 10.5px; font-weight: 600; opacity: .85; letter-spacing: .04em; margin-top: 2px; }

.logo-dmit    { background: linear-gradient(135deg, #f43f5e, #be123c); }
.logo-bwh     { background: linear-gradient(135deg, #22c55e, #15803d); }
.logo-is      { background: linear-gradient(135deg, #38bdf8, #0369a1); }
.logo-vmiss   { background: linear-gradient(135deg, #a78bfa, #6d28d9); }
.logo-rn      { background: linear-gradient(135deg, #fb923c, #c2410c); }
.logo-hg      { background: linear-gradient(135deg, #8b5cf6, #4c1d95); }
.logo-fh      { background: linear-gradient(135deg, #34d399, #047857); }
.logo-sh      { background: linear-gradient(135deg, #64748b, #1e293b); }
.logo-st      { background: linear-gradient(135deg, #ef4444, #7f1d1d); }
.logo-vultr   { background: linear-gradient(135deg, #3b82f6, #1d4ed8); }
.logo-cc      { background: linear-gradient(135deg, #fbbf24, #d97706); }
.logo-rk      { background: linear-gradient(135deg, #ef4444, #991b1b); }
.rank-body { min-width: 0; }
.rank-title-row { display: flex; align-items: center; flex-wrap: wrap; gap: 10px; }
.rank-title-row h3 { font-size: 20px; font-weight: 800; letter-spacing: -.01em; }
.rank-title-row .rank-flag {
  font-size: 12px; font-weight: 700;
  padding: 3px 10px; border-radius: 999px;
  background: var(--primary-soft); color: var(--primary-dark);
  white-space: nowrap;
}
.rank-flag.warn { background: var(--accent-soft); color: #92400e; }
.rank-flag.ok { background: var(--green-soft); color: #166534; }
.rank-sub { font-size: 14.5px; font-weight: 600; color: var(--primary-dark); margin: 4px 0 8px; }
.rank-body p.desc { font-size: 14.5px; color: var(--muted); line-height: 1.75; }

.rank-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
.tag {
  font-size: 12.5px; font-weight: 600;
  color: var(--ink-2);
  background: #f1f5f9;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 4px 12px;
  white-space: nowrap;
}
.tag--price { background: var(--primary-soft); border-color: #c7d7f5; color: var(--primary-dark); }

.rank-side {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 8px;
  min-width: 128px;
}
.rank-side .go {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff; font-weight: 600; font-size: 14.5px;
  padding: 10px 20px; border-radius: 999px;
  box-shadow: 0 8px 18px -8px rgba(37, 99, 235, .5);
  transition: transform .15s, box-shadow .15s;
  white-space: nowrap;
}
.rank-side .go:hover { color: #fff; transform: translateY(-2px); box-shadow: 0 12px 22px -8px rgba(37, 99, 235, .55); }
.rank-side .more { text-align: center; font-size: 13px; color: var(--muted); }
.rank-side .more:hover { color: var(--primary); }

/* ---------------------------------------------------------
   智能推荐选择器
--------------------------------------------------------- */
.selector {
  max-width: 900px;
  margin: 0 auto;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 18px;
  box-shadow: var(--shadow);
  overflow: hidden;
}
.selector-head {
  background: linear-gradient(135deg, #0f172a, #1e3a8a);
  color: #fff;
  padding: 26px 30px;
}
.selector-head h3 { font-size: 20px; font-weight: 800; }
.selector-head p { font-size: 14px; opacity: .82; margin-top: 4px; }
.selector-form { padding: 26px 30px 8px; display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.field label { display: block; font-size: 13.5px; font-weight: 700; color: var(--ink-2); margin-bottom: 7px; }
.field select {
  width: 100%;
  padding: 11px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 14.5px;
  font-family: inherit;
  color: var(--ink);
  background: #fff;
  cursor: pointer;
  transition: border-color .15s, box-shadow .15s;
}
.field select:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(37, 99, 235, .14); }
.selector-actions { padding: 18px 30px 26px; display: flex; gap: 12px; flex-wrap: wrap; }

.selector-result { display: none; padding: 0 30px 30px; }
.selector-result.show { display: block; }
.result-box {
  background: var(--primary-soft);
  border: 1px solid #c7d7f5;
  border-radius: var(--radius);
  padding: 22px 24px;
}
.result-box h4 { font-size: 16px; font-weight: 800; color: var(--primary-dark); margin-bottom: 4px; }
.result-box .result-note { font-size: 13px; color: var(--muted); margin-bottom: 14px; }
.result-items { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.result-item {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.result-item .ri-name { display: flex; align-items: center; gap: 8px; font-weight: 800; font-size: 15px; }
.ri-dot { width: 10px; height: 10px; border-radius: 3px; flex: none; }
.ri-dot.dmit { background: #e11d48; }
.ri-dot.bwh { background: #16a34a; }
.ri-dot.is { background: #0284c7; }
.ri-dot.vmiss { background: #7c3aed; }
.ri-dot.rn { background: #ea580c; }
.ri-dot.hg { background: #6d28d9; }
.ri-dot.fh { background: #059669; }
.ri-dot.sh { background: #475569; }
.ri-dot.st { background: #b91c1c; }
.ri-dot.vultr { background: #1d4ed8; }
.ri-dot.cloudcone { background: #d97706; }
.ri-dot.raksmart { background: #991b1b; }
.result-item .ri-price { font-size: 12.5px; color: var(--primary-dark); font-weight: 700; }
.result-item .ri-why { font-size: 12.5px; color: var(--muted); line-height: 1.6; flex: 1; }
.result-item .ri-btn {
  margin-top: 4px;
  text-align: center;
  font-size: 13px; font-weight: 700;
  border: 1px solid #c7d7f5;
  border-radius: 999px;
  padding: 7px 0;
  color: var(--primary-dark);
  transition: background .15s, color .15s;
}
.result-item .ri-btn:hover { background: var(--primary); border-color: var(--primary); color: #fff; }

/* ---------------------------------------------------------
   场景速览网格
--------------------------------------------------------- */
.scene-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.scene-card {
  display: flex;
  flex-direction: column;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 22px;
  box-shadow: var(--shadow);
  color: var(--ink);
  transition: transform .18s, box-shadow .18s, border-color .18s;
}
.scene-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); border-color: #c7d7f5; color: var(--ink); }
.scene-card .sc-top { display: flex; align-items: center; gap: 12px; margin-bottom: 12px; }
.scene-card .sc-icon {
  width: 46px; height: 46px; border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  font-size: 23px; background: var(--primary-soft); flex: none;
}
.scene-card .sc-no { font-size: 12px; font-weight: 700; color: var(--muted); letter-spacing: .08em; }
.scene-card h3 { font-size: 17px; font-weight: 800; line-height: 1.35; }
.scene-card p { font-size: 13.5px; color: var(--muted); flex: 1; }
.scene-card .sc-providers { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 14px; }
.scene-card .sc-providers span {
  font-size: 12px; font-weight: 700;
  color: var(--primary-dark); background: var(--primary-soft);
  border-radius: 999px; padding: 3px 10px;
}
.scene-card .sc-link { margin-top: 14px; font-size: 13.5px; font-weight: 700; color: var(--primary); }

/* ---------------------------------------------------------
   表格
--------------------------------------------------------- */
.table-wrap {
  overflow-x: auto;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  -webkit-overflow-scrolling: touch;
}
table.data { width: 100%; border-collapse: collapse; font-size: 14px; min-width: 640px; }
table.data th {
  background: #f1f5f9;
  text-align: left;
  font-weight: 700;
  font-size: 13px;
  color: var(--ink-2);
  padding: 13px 16px;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}
table.data td {
  padding: 13px 16px;
  border-bottom: 1px solid var(--border);
  color: var(--ink-2);
  vertical-align: middle;
}
table.data tbody tr:last-child td { border-bottom: none; }
table.data tbody tr:hover td { background: #f8fafc; }
table.data .price { font-weight: 800; color: var(--primary-dark); white-space: nowrap; }
table.data .price--hot { color: var(--red); }
table.data .pname { font-weight: 700; color: var(--ink); white-space: nowrap; }
table.data .center { text-align: center; }
table.data .nowrap { white-space: nowrap; }
table.data .muted { color: var(--muted); font-size: 13px; }

.buy-btn {
  display: inline-block;
  font-size: 13px; font-weight: 700;
  color: var(--primary-dark);
  background: var(--primary-soft);
  border: 1px solid #c7d7f5;
  border-radius: 999px;
  padding: 6px 16px;
  white-space: nowrap;
  transition: background .15s, color .15s;
}
.buy-btn:hover { background: var(--primary); border-color: var(--primary); color: #fff; }

/* 套餐折叠区（参考 naibabiji 套餐手风琴） */
.plan-acc { max-width: 980px; margin: 0 auto; display: flex; flex-direction: column; gap: 14px; }
.plan-item {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}
.plan-item summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 20px 24px;
  transition: background .15s;
}
.plan-item summary::-webkit-details-marker { display: none; }
.plan-item summary:hover { background: #f8fafc; }
.plan-item summary .pl-badge {
  width: 44px; height: 44px; border-radius: 12px; flex: none;
  display: flex; align-items: center; justify-content: center;
  color: #fff; font-weight: 800; font-size: 17px;
}
.plan-item summary .pl-title { flex: 1; min-width: 0; }
.plan-item summary .pl-title h3 { font-size: 16.5px; font-weight: 800; }
.plan-item summary .pl-title p { font-size: 13px; color: var(--muted); }
.plan-item summary .pl-chip {
  font-size: 12px; font-weight: 700;
  border-radius: 999px; padding: 4px 12px;
  background: var(--accent-soft); color: #92400e;
  white-space: nowrap;
}
.plan-item summary .caret { flex: none; transition: transform .2s; color: var(--muted); }
.plan-item[open] summary .caret { transform: rotate(180deg); }
.plan-item .plan-body { padding: 0 24px 22px; }

/* ---------------------------------------------------------
   提示 / 警示框
--------------------------------------------------------- */
.callout {
  display: flex;
  gap: 12px;
  background: var(--primary-soft);
  border: 1px solid #c7d7f5;
  border-left: 4px solid var(--primary);
  border-radius: var(--radius-sm);
  padding: 16px 18px;
  font-size: 14px;
  color: var(--ink-2);
  margin: 18px 0;
}
.callout .co-icon { flex: none; font-size: 18px; line-height: 1.5; }
.callout strong { color: var(--ink); }
.callout--warn { background: var(--accent-soft); border-color: #fde68a; border-left-color: #d97706; }
.callout--green { background: var(--green-soft); border-color: #bbf7d0; border-left-color: var(--green); }
.callout--red { background: var(--red-soft); border-color: #fecaca; border-left-color: var(--red); }
.callout p + p { margin-top: 6px; }

/* ---------------------------------------------------------
   避坑 / 知识卡片
--------------------------------------------------------- */
.tip-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.tip-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 22px;
  box-shadow: var(--shadow);
  display: flex; flex-direction: column;
  transition: transform .18s, box-shadow .18s;
}
.tip-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-hover); }
.tip-card .tc-icon {
  width: 44px; height: 44px; border-radius: 12px;
  background: var(--primary-soft);
  display: flex; align-items: center; justify-content: center;
  font-size: 21px; margin-bottom: 14px;
}
.tip-card h3 { font-size: 16.5px; font-weight: 800; margin-bottom: 8px; }
.tip-card p { font-size: 13.5px; color: var(--muted); flex: 1; }
.tip-card .tc-foot { margin-top: 14px; font-size: 13.5px; font-weight: 700; }
.tip-card .tc-foot a { color: var(--primary); }
.tip-card .tc-foot .no { color: #b91c1c; }
.tip-card .tc-foot .yes { color: #15803d; }

/* ---------------------------------------------------------
   FAQ 手风琴
--------------------------------------------------------- */
.faq-list { max-width: 860px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }
.faq-item {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  box-shadow: 0 1px 2px rgba(15, 23, 42, .04);
  overflow: hidden;
}
.faq-item summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 18px 22px;
  font-size: 15.5px;
  font-weight: 700;
  color: var(--ink);
  transition: background .15s;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary:hover { background: #f8fafc; }
.faq-item summary .q-mark {
  flex: none;
  width: 28px; height: 28px; border-radius: 8px;
  background: var(--primary-soft); color: var(--primary-dark);
  font-size: 13px; font-weight: 800;
  display: flex; align-items: center; justify-content: center;
}
.faq-item summary .caret { margin-left: auto; flex: none; transition: transform .2s; color: var(--muted); }
.faq-item[open] summary .caret { transform: rotate(180deg); }
.faq-item[open] summary { border-bottom: 1px solid var(--border); }
.faq-body { padding: 18px 22px 22px 64px; font-size: 14.5px; color: var(--ink-2); }
.faq-body p + p { margin-top: 8px; }
.faq-body ul, .faq-body ol { margin: 8px 0 8px 20px; }
.faq-body li { margin: 4px 0; }
.faq-body table { margin: 10px 0; }

/* ---------------------------------------------------------
   下一步阅读
--------------------------------------------------------- */
.next-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.next-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px 24px;
  box-shadow: var(--shadow);
  color: var(--ink);
  display: flex; flex-direction: column;
  transition: transform .18s, box-shadow .18s, border-color .18s;
}
.next-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); border-color: #c7d7f5; color: var(--ink); }
.next-card .nc-kicker { font-size: 12.5px; font-weight: 700; letter-spacing: .1em; color: var(--primary); margin-bottom: 10px; }
.next-card h3 { font-size: 18px; font-weight: 800; margin-bottom: 8px; }
.next-card p { font-size: 14px; color: var(--muted); flex: 1; }
.next-card .nc-link { margin-top: 16px; font-weight: 700; font-size: 14.5px; color: var(--primary); }

/* ---------------------------------------------------------
   子页面布局：TOC + 正文
--------------------------------------------------------- */
.doc-layout {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
  gap: 36px;
  align-items: start;
  padding: 40px 0 64px;
}
.doc-toc {
  position: sticky;
  top: 84px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 16px;
  box-shadow: var(--shadow);
}
.doc-toc .toc-title { font-size: 13px; font-weight: 800; letter-spacing: .08em; color: var(--muted); margin-bottom: 10px; padding-left: 10px; }
.doc-toc a {
  display: block;
  font-size: 13.5px;
  color: var(--ink-2);
  padding: 6px 10px;
  border-radius: 8px;
  border-left: 2px solid transparent;
  line-height: 1.5;
}
.doc-toc a:hover { background: var(--primary-soft); color: var(--primary-dark); }

.doc-main { min-width: 0; }
.doc-section {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 30px 32px;
  margin-bottom: 26px;
  scroll-margin-top: 88px;
}
.doc-section h2 {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 22px;
  font-weight: 800;
  letter-spacing: -.01em;
  margin-bottom: 6px;
}
.doc-section h2 .h-emoji { font-size: 20px; }
.doc-section > .sec-lead { color: var(--muted); font-size: 14.5px; margin-bottom: 18px; }
.doc-section h3 { font-size: 17px; font-weight: 800; margin: 24px 0 10px; }
.doc-section h4 { font-size: 15px; font-weight: 800; margin: 18px 0 8px; }
.doc-section p { font-size: 14.5px; color: var(--ink-2); margin: 8px 0; }
.doc-section ul, .doc-section ol { margin: 8px 0 8px 22px; font-size: 14.5px; color: var(--ink-2); }
.doc-section li { margin: 5px 0; }
.doc-section code {
  font-family: var(--mono);
  font-size: 13px;
  background: #f1f5f9;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1px 7px;
  color: #be185d;
}

.scene-head {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 4px;
}
.scene-head .sh-icon {
  width: 48px; height: 48px; border-radius: 13px; flex: none;
  background: var(--primary-soft);
  display: flex; align-items: center; justify-content: center;
  font-size: 24px;
}
.scene-head h2 { font-size: 21px; }
.scene-meta { display: flex; flex-wrap: wrap; gap: 8px; margin: 10px 0 16px; }
.scene-meta span {
  font-size: 12.5px; font-weight: 600;
  background: #f1f5f9; border: 1px solid var(--border);
  border-radius: 999px; padding: 4px 12px; color: var(--ink-2);
}
.scene-meta span.hot { background: var(--primary-soft); border-color: #c7d7f5; color: var(--primary-dark); }

/* ---------------------------------------------------------
   关键词索引
--------------------------------------------------------- */
.kw-cloud { display: flex; flex-wrap: wrap; gap: 10px; }
.kw-cloud span {
  font-size: 13px; font-weight: 600;
  color: var(--ink-2);
  background: #f1f5f9;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 6px 15px;
  transition: all .15s;
}
.kw-cloud span:hover { background: var(--primary-soft); border-color: #c7d7f5; color: var(--primary-dark); }

/* ---------------------------------------------------------
   页脚
--------------------------------------------------------- */
.site-footer {
  background: #0b1220;
  color: #94a3b8;
  margin-top: 40px;
}
.footer-top {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 36px;
  padding: 52px 0 40px;
}
.footer-brand .fb-name {
  display: flex; align-items: center; gap: 10px;
  color: #fff; font-weight: 800; font-size: 19px; margin-bottom: 12px;
}
.footer-brand .fb-name .brand-badge { width: 30px; height: 30px; border-radius: 8px; font-size: 13px; }
.footer-brand p { font-size: 13.5px; line-height: 1.8; }
.footer-col h4 { color: #e2e8f0; font-size: 14.5px; font-weight: 700; margin-bottom: 14px; }
.footer-col ul { list-style: none; }
.footer-col li { margin: 8px 0; }
.footer-col a { color: #94a3b8; font-size: 13.5px; }
.footer-col a:hover { color: #fff; }
.footer-bottom {
  border-top: 1px solid rgba(148, 163, 184, .16);
  padding: 20px 0 26px;
  font-size: 12.5px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: space-between;
}
.footer-bottom .disclosure { max-width: 760px; line-height: 1.7; }

/* 回到顶部 */
.back-top {
  position: fixed;
  right: 22px; bottom: 22px;
  width: 44px; height: 44px;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  border: none;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 10px 24px -8px rgba(37, 99, 235, .6);
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: all .22s;
  z-index: 90;
}
.back-top.show { opacity: 1; visibility: visible; transform: none; }
.back-top:hover { background: var(--primary-dark); }
.back-top svg { width: 20px; height: 20px; }

/* 更新记录表 */
.changelog-wrap table.data { min-width: 560px; }
.changelog-wrap table.data td:first-child { white-space: nowrap; }
.changelog-wrap table.data td:nth-child(2) { white-space: nowrap; font-weight: 700; color: var(--primary-dark); }

/* ---------------------------------------------------------
   响应式
--------------------------------------------------------- */
@media (max-width: 1024px) {
  .quick-tips { grid-template-columns: repeat(2, 1fr); }
  .tip-grid { grid-template-columns: repeat(2, 1fr); }
  .scene-grid { grid-template-columns: repeat(2, 1fr); }
  .next-grid { grid-template-columns: repeat(2, 1fr); }
  .rank-card { grid-template-columns: minmax(130px, auto) minmax(0, 1fr); }
  .rank-logo { width: 72px; height: 72px; font-size: 22px; border-radius: 16px; }
  .rank-side { grid-column: 2; flex-direction: row; align-items: center; justify-content: flex-start; margin-top: 4px; }
  .rank-side .more { margin-left: 14px; }
  .doc-layout { grid-template-columns: 1fr; }
  .doc-toc { position: static; order: -1; }
  .doc-toc .toc-list { display: flex; flex-wrap: wrap; gap: 4px; }
  .doc-toc a { border-left: none; border: 1px solid var(--border); border-radius: 999px; padding: 5px 13px; }
  .footer-top { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .main-nav {
    display: none;
    position: absolute;
    top: 64px; left: 0; right: 0;
    background: #fff;
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    align-items: stretch;
    padding: 10px 16px 16px;
    gap: 4px;
    box-shadow: 0 20px 40px -20px rgba(15, 23, 42, .25);
  }
  .main-nav.open { display: flex; }
  .main-nav a { padding: 12px 16px; border-radius: 10px; }
  .header-cta { display: none; }
  .nav-toggle { display: inline-flex; }

  .hero { padding: 44px 0 40px; }
  .section { padding: 46px 0; }

  .rank-card { grid-template-columns: 1fr; gap: 14px; padding: 22px 20px; }
  .rank-head-m { gap: 14px; }
  .rank-num { width: 44px; height: 44px; font-size: 18px; flex: none; }
  .rank-side { flex-direction: column; align-items: stretch; }
  .rank-side .more { margin: 0; }

  .selector-form { grid-template-columns: 1fr; padding: 20px 20px 4px; }
  .selector-actions, .selector-result { padding-left: 20px; padding-right: 20px; }
  .result-items { grid-template-columns: 1fr; }

  .scene-grid { grid-template-columns: 1fr; }
  .tip-grid { grid-template-columns: 1fr; }
  .next-grid { grid-template-columns: 1fr; }
  .quick-tips { grid-template-columns: 1fr; }

  .doc-section { padding: 22px 18px; }
  .faq-body { padding-left: 22px; }
  .footer-top { grid-template-columns: 1fr; gap: 28px; }
  .hero-actions .btn { width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
}