/* ==========================================================================
   鼠标驱动集群站 · 全站样式
   设计原则：浅底 + 白卡 + 单一主色，信息密度优先（集群页要放大量链接）
   ========================================================================== */

:root {
  --brand: #2563eb;
  --brand-dark: #1d4ed8;
  --brand-soft: #eff4ff;
  --bg: #f6f7f9;
  --card: #ffffff;
  --text: #1a1d23;
  --muted: #5b6472;
  --border: #e5e7eb;
  --radius: 10px;
  --shadow: 0 1px 2px rgba(16, 24, 40, .05), 0 1px 3px rgba(16, 24, 40, .06);
  --shadow-hover: 0 6px 18px rgba(16, 24, 40, .10);
  --wrap: 1080px;
}

*, *::before, *::after { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.75 -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei",
        "PingFang SC", "Hiragino Sans GB", sans-serif;
}

img { max-width: 100%; height: auto; display: block; }

a { color: var(--brand); text-decoration: none; }
a:hover { color: var(--brand-dark); text-decoration: underline; }

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 20px; }

/* ---------- 头部 ---------- */
.site-header {
  background: #fff;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 20;
}
.site-header .wrap {
  display: flex;
  align-items: center;
  gap: 24px;
  min-height: 60px;
}
.logo {
  font-size: 17px;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -.2px;
  white-space: nowrap;
  display: flex;
  align-items: center;
  flex-shrink: 0;
}
.logo:hover { color: var(--brand); text-decoration: none; }
.logo span { color: var(--brand); }
/* 站点 logo 图。源图 165x50（3.3:1），按高 32px 显示应为 106px 宽，不要写成 120x32 否则会被压扁 */
.logo img { display: block; height: 32px; width: auto; }

.site-nav { display: flex; gap: 20px; margin-left: auto; flex-wrap: wrap; }
.site-nav a { font-size: 14px; color: var(--muted); }
.site-nav a:hover { color: var(--brand); }

/* ---------- 面包屑 ---------- */
.breadcrumb {
  font-size: 13px;
  color: var(--muted);
  padding: 16px 0 4px;
}
.breadcrumb ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0;
  padding: 0;
}
.breadcrumb li::after { content: "/"; margin-left: 6px; color: #c3c8d0; }
.breadcrumb li:last-child::after { content: ""; }
.breadcrumb a { color: var(--muted); }
.breadcrumb a:hover { color: var(--brand); }

/* ---------- 正文排版 ---------- */
main { padding-bottom: 56px; }

h1 {
  font-size: 30px;
  line-height: 1.35;
  letter-spacing: -.5px;
  margin: 12px 0 14px;
}
h2 {
  font-size: 21px;
  margin: 44px 0 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
  line-height: 1.4;
}
h3 { font-size: 17px; margin: 26px 0 8px; }
p { margin: 0 0 14px; }
ul, ol { padding-left: 22px; }
li { margin-bottom: 6px; }

.lead { font-size: 17px; color: #3d4553; margin-bottom: 20px; }
.muted { color: var(--muted); font-size: 14px; }
.updated { font-size: 13px; color: var(--muted); margin: 0 0 8px; }

/* ---------- 卡片网格 ---------- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 14px;
  margin: 18px 0 8px;
}
.card {
  display: block;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: var(--shadow);
  transition: box-shadow .18s, transform .18s, border-color .18s;
}
.card:hover {
  text-decoration: none;
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
  border-color: #cfd8e6;
}
.card h3 { margin: 0 0 6px; font-size: 16px; color: var(--text); }
.card p { margin: 0; font-size: 13.5px; color: var(--muted); line-height: 1.65; }
.card .tag {
  display: inline-block;
  margin-top: 12px;
  font-size: 12px;
  color: var(--brand);
  background: var(--brand-soft);
  border-radius: 999px;
  padding: 3px 10px;
}

/* ---------- 速览信息块 ---------- */
.spec {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 4px 0;
  margin: 18px 0 24px;
  box-shadow: var(--shadow);
}
.spec dl { margin: 0; }
.spec .row {
  display: flex;
  gap: 16px;
  padding: 11px 18px;
  border-bottom: 1px solid var(--border);
  font-size: 14.5px;
}
.spec .row:last-child { border-bottom: 0; }
.spec dt { flex: 0 0 108px; color: var(--muted); margin: 0; }
.spec dd { flex: 1; margin: 0; }

/* ---------- 表格 ---------- */
.table-scroll { overflow-x: auto; margin: 18px 0 24px; }
table {
  width: 100%;
  border-collapse: collapse;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  font-size: 14.5px;
}
th, td { padding: 11px 14px; text-align: left; border-bottom: 1px solid var(--border); }
th { background: #fafbfc; font-weight: 600; color: #3d4553; white-space: nowrap; }
tr:last-child td { border-bottom: 0; }
tbody tr:hover { background: #fcfcfd; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-block;
  background: var(--brand);
  color: #fff;
  padding: 11px 22px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 15px;
  transition: background .18s;
}
.btn:hover { background: var(--brand-dark); color: #fff; text-decoration: none; }
.btn.ghost {
  background: #fff;
  color: var(--brand);
  border: 1px solid #c7d6f5;
}
.btn.ghost:hover { background: var(--brand-soft); }

/* ---------- 提示块 ---------- */
.callout {
  background: var(--brand-soft);
  border: 1px solid #d6e2fb;
  border-left: 3px solid var(--brand);
  border-radius: 8px;
  padding: 14px 18px;
  margin: 18px 0;
  font-size: 14.5px;
}
.callout p:last-child { margin-bottom: 0; }
.callout strong { color: var(--brand-dark); }

/* ---------- 步骤 ---------- */
.steps { counter-reset: step; list-style: none; padding: 0; margin: 18px 0; }
.steps > li {
  counter-increment: step;
  position: relative;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 18px 14px 56px;
  margin-bottom: 10px;
}
.steps > li::before {
  content: counter(step);
  position: absolute;
  left: 16px;
  top: 14px;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--brand);
  color: #fff;
  font-size: 13px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}
.steps > li strong { display: block; margin-bottom: 2px; }
.steps > li p { margin: 0; font-size: 14px; color: var(--muted); }

/* ---------- FAQ ---------- */
.faq { margin: 18px 0; }
.faq details {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 8px;
  padding: 0 18px;
}
.faq summary {
  cursor: pointer;
  font-weight: 600;
  padding: 14px 0;
  font-size: 15.5px;
  list-style: none;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::before { content: "＋ "; color: var(--brand); font-weight: 700; }
.faq details[open] summary::before { content: "－ "; }
.faq details > p,
.faq details > div { margin: 0 0 14px; font-size: 14.5px; color: #3d4553; }

/* ---------- 相关阅读 ---------- */
.related {
  margin-top: 48px;
  padding-top: 22px;
  border-top: 1px solid var(--border);
}
.related h2 { font-size: 17px; border: 0; margin: 0 0 12px; padding: 0; }
.related ul { columns: 2; column-gap: 32px; list-style: none; padding: 0; }
.related li { margin-bottom: 8px; font-size: 14.5px; }
@media (max-width: 620px) { .related ul { columns: 1; } }

/* ---------- 下载 CTA ---------- */
.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 18px 0 10px;
}
.btn.primary { background: var(--brand); color: #fff; }
.btn.primary:hover { background: var(--brand-dark); color: #fff; }
.source-note { font-size: 13px; color: var(--muted); margin: 0 0 24px; }

/* ---------- 移动端固定下载栏 ---------- */
.mobile-download-bar { display: none; }
@media (max-width: 720px) {
  body { padding-bottom: 68px; }
  .mobile-download-bar {
    display: flex;
    position: fixed;
    left: 0; right: 0; bottom: 0;
    z-index: 30;
    background: #fff;
    border-top: 1px solid var(--border);
    padding: 10px 14px;
    box-shadow: 0 -2px 10px rgba(16, 24, 40, .08);
  }
  .mobile-download-bar .btn { flex: 1; text-align: center; }
}

/* ---------- 页脚三列 ---------- */
.site-footer {
  border-top: 1px solid var(--border);
  background: #fff;
  padding: 28px 0;
  font-size: 13.5px;
  color: var(--muted);
}
.footer-cols {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 28px;
  margin-bottom: 20px;
}
.footer-col h4 { font-size: 13px; margin: 0 0 10px; color: var(--text); }
.footer-logo { display: block; height: 28px; width: auto; margin: 0 0 12px; }
.footer-col ul { list-style: none; margin: 0; padding: 0; }
.footer-col li { margin-bottom: 7px; }
.footer-brandline { font-size: 13.5px; color: var(--muted); margin: 0; line-height: 1.7; }
.site-footer a { color: var(--muted); }
.site-footer a:hover { color: var(--brand); }
@media (max-width: 720px) {
  .footer-cols { grid-template-columns: 1fr; gap: 20px; }
}

/* ---------- 法律块 ---------- */
.legal {
  border-top: 1px solid var(--border);
  margin-top: 18px;
  padding-top: 16px;
  font-size: 12.5px;
  color: #8b93a1;
  text-align: center;
}
.legal p { margin: 0 0 6px; }
.legal a { color: #8b93a1; }

/* ---------- 响应式 ---------- */
@media (max-width: 720px) {
  h1 { font-size: 24px; }
  h2 { font-size: 19px; }
  .lead { font-size: 16px; }
  .spec .row { flex-direction: column; gap: 2px; }
  .spec dt { flex: none; }
  .site-header .wrap { min-height: 54px; gap: 14px; }
  .site-nav { gap: 14px; }
}