:root {
  --blue:    #2563eb;
  --blue-dk: #1d4ed8;
  --green:   #16a34a;
  --red:     #dc2626;
  --gray-50: #f9fafb;
  --gray-100:#f3f4f6;
  --gray-200:#e5e7eb;
  --gray-600:#4b5563;
  --gray-700:#374151;
  --gray-900:#111827;
  --radius:  8px;
  --shadow:  0 1px 3px rgba(0,0,0,.1), 0 1px 2px rgba(0,0,0,.06);
  --shadow-md:0 4px 6px rgba(0,0,0,.07), 0 2px 4px rgba(0,0,0,.06);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
               "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: var(--gray-700);
  background: #fff;
}

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

/* ── 容器 ── */
.container { max-width: 1100px; margin: 0 auto; padding: 0 20px; }

/* ── 顶部导航 ── */
.header {
  background: #fff;
  border-bottom: 1px solid var(--gray-200);
  position: sticky; top: 0; z-index: 100;
  box-shadow: var(--shadow);
}
.header .container {
  display: flex; align-items: center;
  justify-content: space-between; height: 60px;
}
.logo {
  display: flex; align-items: center; gap: 8px;
  font-size: 18px; font-weight: 700; color: var(--gray-900);
  text-decoration: none;
}
.logo svg { width: 32px; height: 32px; flex-shrink: 0; }
.nav { display: flex; gap: 4px; }
.nav a {
  padding: 6px 14px; border-radius: var(--radius);
  font-size: 14px; font-weight: 500; color: var(--gray-600);
  text-decoration: none; transition: background .15s, color .15s;
}
.nav a:hover { background: var(--gray-100); color: var(--gray-900); }
.nav a.active { background: var(--blue); color: #fff; }

/* ── 面包屑 ── */
.breadcrumb {
  padding: 12px 20px; font-size: 13px; color: var(--gray-600);
}
.breadcrumb a { color: var(--gray-600); }
.breadcrumb a:hover { color: var(--blue); }
.breadcrumb span { margin: 0 6px; color: var(--gray-200); }

/* ── Hero 区 ── */
.hero {
  background: linear-gradient(135deg, #1e40af 0%, #2563eb 50%, #3b82f6 100%);
  color: #fff; padding: 72px 0;
  text-align: center;
}
.hero h1 { font-size: 42px; font-weight: 800; margin-bottom: 16px; }
.hero .hero-sub {
  font-size: 18px; opacity: .9;
  max-width: 600px; margin: 0 auto 32px;
}
.hero-btns { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

/* ── 按钮 ── */
.btn {
  display: inline-block; padding: 11px 28px;
  border-radius: var(--radius); font-size: 15px; font-weight: 600;
  cursor: pointer; transition: opacity .15s, transform .1s;
  text-decoration: none;
}
.btn:hover { opacity: .9; transform: translateY(-1px); text-decoration: none; }
.btn-primary  { background: var(--blue);  color: #fff; }
.btn-secondary { background: #fff; color: var(--blue); }

/* ── 通用 section ── */
.section { padding: 60px 0; }
.section-gray { background: var(--gray-50); }
.section-title {
  font-size: 28px; font-weight: 700; color: var(--gray-900);
  text-align: center; margin-bottom: 40px;
}

/* ── 卡片网格 ── */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 20px;
}
.card {
  display: block; background: #fff; border: 1px solid var(--gray-200);
  border-radius: 12px; padding: 24px 20px;
  box-shadow: var(--shadow); transition: box-shadow .2s, transform .2s;
  text-decoration: none; color: inherit;
}
.card:hover { box-shadow: var(--shadow-md); transform: translateY(-3px); text-decoration: none; }
.card-icon { margin-bottom: 14px; width: 56px; height: 56px; }
.card-icon svg { width: 56px; height: 56px; display: block; }
.card h3 { font-size: 16px; font-weight: 700; color: var(--gray-900); margin-bottom: 8px; }
.card p  { font-size: 14px; color: var(--gray-600); line-height: 1.6; margin-bottom: 12px; }
.card-link { font-size: 13px; color: var(--blue); font-weight: 600; }

/* ── 内容布局（正文+侧栏）── */
.content-layout {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 40px;
  padding: 40px 20px;
  align-items: start;
}
.main-content { min-width: 0; }
.main-content h1 {
  font-size: 32px; font-weight: 800; color: var(--gray-900);
  margin-bottom: 16px; line-height: 1.3;
}
.main-content h2 {
  font-size: 22px; font-weight: 700; color: var(--gray-900);
  margin: 36px 0 14px; padding-bottom: 8px;
  border-bottom: 2px solid var(--gray-100);
}
.main-content h3 { font-size: 17px; font-weight: 700; margin: 24px 0 10px; color: var(--gray-900); }
.main-content p  { margin-bottom: 14px; }
.main-content ul, .main-content ol { padding-left: 20px; margin-bottom: 14px; }
.main-content li { margin-bottom: 6px; }
.lead { font-size: 17px; color: var(--gray-600); margin-bottom: 28px !important; }

/* ── 侧栏 ── */
.sidebar { position: sticky; top: 80px; }
.sidebar-card {
  background: var(--gray-50); border: 1px solid var(--gray-200);
  border-radius: 12px; padding: 20px; margin-bottom: 20px;
}
.sidebar-card h3 { font-size: 14px; font-weight: 700; color: var(--gray-900); margin-bottom: 12px; }
.sidebar-card ul { list-style: none; padding: 0; }
.sidebar-card li { margin-bottom: 8px; }
.sidebar-card a { font-size: 14px; color: var(--gray-600); }
.sidebar-card a:hover { color: var(--blue); }

/* ── 表格 ── */
.table-wrap { overflow-x: auto; margin: 20px 0; }
.compare-table {
  width: 100%; border-collapse: collapse; font-size: 14px;
}
.compare-table th {
  background: var(--gray-100); color: var(--gray-900);
  font-weight: 700; padding: 10px 14px; text-align: left;
  border-bottom: 2px solid var(--gray-200);
}
.compare-table td {
  padding: 10px 14px; border-bottom: 1px solid var(--gray-100);
  vertical-align: top;
}
.compare-table tr:hover td { background: var(--gray-50); }

/* ── 标签 ── */
.tag {
  display: inline-block; padding: 2px 10px; border-radius: 100px;
  font-size: 12px; font-weight: 600;
}
.tag-green  { background: #dcfce7; color: #166534; }
.tag-yellow { background: #fef9c3; color: #854d0e; }
.tag-red    { background: #fee2e2; color: #991b1b; }

/* ── 工具列表 ── */
.tool-list { display: flex; flex-direction: column; gap: 16px; margin: 20px 0; }
.tool-item {
  background: var(--gray-50); border: 1px solid var(--gray-200);
  border-radius: var(--radius); padding: 18px 20px;
}
.tool-item h3 { font-size: 16px; font-weight: 700; color: var(--gray-900); margin-bottom: 6px; }
.tool-item p  { font-size: 14px; margin-bottom: 8px; }
.tool-item ul { padding-left: 18px; font-size: 14px; }

/* ── 工具对比卡片 ── */
.tool-compare { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 16px; margin: 20px 0; }
.tool-card {
  border: 1px solid var(--gray-200); border-radius: 12px; padding: 20px;
  text-align: center;
}
.tool-card.featured { border-color: var(--blue); border-width: 2px; }
.tool-card h4 { font-size: 16px; font-weight: 700; margin-bottom: 4px; }
.tool-card .score {
  font-size: 28px; font-weight: 800; color: var(--blue); margin: 8px 0;
}
.tool-card p { font-size: 13px; color: var(--gray-600); margin-bottom: 10px; }
.tool-card ul { list-style: none; padding: 0; text-align: left; font-size: 13px; }
.tool-card li { padding: 3px 0; border-bottom: 1px solid var(--gray-100); }

/* ── 提示框 ── */
.tip-box {
  background: #eff6ff; border-left: 4px solid var(--blue);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 14px 16px; margin: 16px 0; font-size: 14px;
}

/* ── 代码块 ── */
.code-block, pre.code-block {
  background: var(--gray-900); color: #e2e8f0;
  border-radius: var(--radius); padding: 16px 20px;
  font-family: "Cascadia Code", Consolas, monospace;
  font-size: 13px; line-height: 1.6; overflow-x: auto;
  white-space: pre; margin: 16px 0;
}

/* ── FAQ ── */
.faq-list { display: flex; flex-direction: column; gap: 12px; }
.faq-item {
  border: 1px solid var(--gray-200); border-radius: var(--radius);
  overflow: hidden;
}
.faq-q {
  background: var(--gray-50); padding: 14px 18px;
  font-weight: 700; font-size: 15px; color: var(--gray-900);
}
.faq-a { padding: 14px 18px; font-size: 14px; background: #fff; }

/* ── 排行榜 ── */
.rank-list { display: flex; flex-direction: column; gap: 14px; }
.rank-item {
  display: flex; align-items: flex-start; gap: 16px;
  padding: 18px; border: 1px solid var(--gray-200); border-radius: 12px;
  background: #fff;
}
.rank-num {
  width: 36px; height: 36px; border-radius: 50%;
  background: var(--gray-100); color: var(--gray-700);
  display: flex; align-items: center; justify-content: center;
  font-weight: 800; font-size: 16px; flex-shrink: 0;
}
.rank-item:nth-child(1) .rank-num { background: #fbbf24; color: #fff; }
.rank-item:nth-child(2) .rank-num { background: #9ca3af; color: #fff; }
.rank-item:nth-child(3) .rank-num { background: #cd7c3f; color: #fff; }
.rank-body { flex: 1; }
.rank-body h3 { font-size: 16px; font-weight: 700; color: var(--gray-900); margin-bottom: 4px; }
.rank-body p  { font-size: 14px; color: var(--gray-600); }
.rank-score { font-size: 22px; font-weight: 800; color: var(--blue); flex-shrink: 0; }

/* ── 页脚 ── */
.footer { background: var(--gray-900); color: #9ca3af; padding: 48px 0 24px; }
.footer-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 32px; margin-bottom: 32px;
}
.footer-col h4 { font-size: 14px; font-weight: 700; color: #fff; margin-bottom: 14px; }
.footer-col ul  { list-style: none; }
.footer-col li  { margin-bottom: 8px; }
.footer-col a   { font-size: 14px; color: #9ca3af; }
.footer-col a:hover { color: #fff; }
.footer-bottom { border-top: 1px solid #374151; padding-top: 20px; font-size: 13px; text-align: center; }

/* ── 响应式 ── */
@media (max-width: 768px) {
  .hero h1 { font-size: 28px; }
  .hero .hero-sub { font-size: 15px; }
  .content-layout { grid-template-columns: 1fr; }
  .sidebar { position: static; }
  .nav a { padding: 6px 10px; font-size: 13px; }
  .section-title { font-size: 22px; }
  .main-content h1 { font-size: 24px; }
}
@media (max-width: 480px) {
  .nav { gap: 2px; }
  .nav a { padding: 5px 8px; font-size: 12px; }
  .hero { padding: 48px 0; }
}

/* ────────────────────────────────────────────────────────────────
   极简信任标一体化下载面板 (符合规范 1 & 规范 4)
   ──────────────────────────────────────────────────────────────── */
.duba-trust-panel {
  background: linear-gradient(180deg, #ffffff, #fafcfd);
  border: 1px solid #e2e8f0; border-radius: 12px;
  padding: 20px 24px; max-width: 720px; width: 100%;
  margin: 24px auto; box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
  text-align: left;
}
.trust-panel-brand-row {
  display: flex; justify-content: space-between; align-items: center;
  font-size: 13px; color: #6b7280; margin-bottom: 14px;
}
.trust-panel-btn {
  display: flex; align-items: center; justify-content: center;
  width: 100%; padding: 15px 24px; font-size: 16px; font-weight: bold;
  color: #fff !important; border-radius: 8px; text-decoration: none;
  transition: all 0.2s; margin-bottom: 12px; border: none; outline: none;
  cursor: pointer;
}
.trust-panel-btn svg {
  width: 20px; height: 22px; margin-right: 10px;
  fill: currentColor; flex-shrink: 0;
}
.trust-btn-blue { background: linear-gradient(135deg, #2563eb, #1d4ed8); }
.trust-panel-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(37, 99, 235, .25); opacity: 0.95;
}
.trust-panel-badges {
  display: flex; gap: 16px; justify-content: center; font-size: 12px; color: #475569;
}
.trust-panel-badges span { display: inline-flex; align-items: center; gap: 4px; }
.trust-panel-badges svg { width: 14px; height: 14px; color: #10b981; fill: none; }

/* 注意事项/免责声明卡片 */
.notice-card {
  background: #fffbeb; border-left: 4px solid #f59e0b;
  padding: 16px 20px; border-radius: 6px; margin: 24px auto;
  max-width: 720px; font-size: 13px; line-height: 1.7; color: #78350f;
  text-align: left;
}
.notice-card strong { color: #b45309; }

.trust-badge-mini {
  display: block; font-size: 12px; color: #9ca3af; margin: 8px auto; text-align: center; width: 100%; max-width: 350px;
}

/* ── Chrome 首页首屏下载区 ── */
.chrome-hero {
  margin: -60px -20px 0;
  padding: 56px 20px 44px;
  color: #fff;
  background:
    linear-gradient(90deg, rgba(15, 23, 42, .82) 0%, rgba(15, 23, 42, .58) 48%, rgba(15, 23, 42, .32) 100%),
    url('../images/hero-bg.png') center/cover no-repeat;
}
.chrome-hero__inner {
  max-width: 1100px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(320px, .78fr);
  gap: 32px;
  align-items: center;
}
.chrome-hero__copy {
  min-width: 0;
}
.chrome-hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
  padding: 5px 12px;
  border: 1px solid rgba(255, 255, 255, .35);
  border-radius: 999px;
  background: rgba(255, 255, 255, .12);
  color: #e0f2fe;
  font-size: 14px;
  font-weight: 700;
}
.chrome-hero h1 {
  max-width: 660px;
  margin: 0 0 14px;
  color: #fff;
  font-size: 48px;
  line-height: 1.14;
  font-weight: 800;
  letter-spacing: 0;
  text-shadow: 0 2px 10px rgba(0, 0, 0, .26);
}
.chrome-hero__summary {
  max-width: 630px;
  margin: 0 0 24px;
  color: #e5eefb;
  font-size: 18px;
  line-height: 1.75;
  text-shadow: 0 1px 4px rgba(0, 0, 0, .2);
}
.chrome-hero__actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  align-items: stretch;
}
.chrome-hero__primary,
.chrome-hero__secondary {
  min-height: 58px;
  border-radius: 8px;
  text-decoration: none;
}
.chrome-hero__primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  min-width: 292px;
  padding: 12px 24px;
  color: #fff;
  background: linear-gradient(180deg, #207cf0 0%, #155fd1 100%);
  box-shadow: 0 10px 24px rgba(21, 95, 209, .34);
}
.chrome-hero__primary span,
.chrome-hero__primary small {
  display: block;
  line-height: 1.25;
}
.chrome-hero__primary span {
  font-size: 18px;
  font-weight: 800;
}
.chrome-hero__primary small {
  margin-top: 3px;
  color: rgba(255, 255, 255, .82);
  font-size: 12px;
  font-weight: 500;
}
.chrome-hero__secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 20px;
  border: 1px solid rgba(255, 255, 255, .7);
  color: #fff;
  background: rgba(255, 255, 255, .13);
  font-weight: 700;
}
.chrome-hero__primary:hover,
.chrome-hero__secondary:hover,
.chrome-platform-link:hover {
  text-decoration: none;
  transform: translateY(-1px);
}
.chrome-hero__trust {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
  color: #e8f5e9;
  font-size: 13px;
}
.chrome-hero__trust span {
  display: inline-flex;
  align-items: center;
  gap: 5px;
}
.chrome-download-card {
  padding: 24px;
  border: 1px solid rgba(255, 255, 255, .18);
  border-radius: 8px;
  background: rgba(255, 255, 255, .96);
  color: var(--gray-700);
  box-shadow: 0 18px 42px rgba(15, 23, 42, .22);
}
.chrome-download-card__top {
  display: flex;
  gap: 12px;
  align-items: center;
  margin-bottom: 18px;
}
.chrome-download-card__top img {
  width: 44px;
  height: 44px;
  flex-shrink: 0;
}
.chrome-download-card__title {
  color: var(--gray-900);
  font-size: 18px;
  font-weight: 800;
  line-height: 1.3;
}
.chrome-download-card__meta {
  margin-top: 2px;
  color: #64748b;
  font-size: 13px;
}
.chrome-platform-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}
.chrome-platform-link {
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 72px;
  padding: 12px 14px;
  border: 1px solid #dbe3ef;
  border-radius: 8px;
  background: #f8fafc;
  color: var(--gray-700);
  transition: transform .15s, border-color .15s, background .15s;
}
.chrome-platform-link strong {
  color: var(--gray-900);
  font-size: 15px;
  line-height: 1.35;
}
.chrome-platform-link span {
  margin-top: 4px;
  color: #64748b;
  font-size: 12px;
  line-height: 1.35;
}
.chrome-platform-link.is-primary {
  border-color: #93c5fd;
  background: #eff6ff;
}
.chrome-download-card__note {
  margin: 14px 0 0;
  color: #64748b;
  font-size: 13px;
  line-height: 1.65;
}

@media (max-width: 768px) {
  .chrome-hero {
    margin: -60px -20px 0;
    padding: 40px 16px 32px;
    background:
      linear-gradient(180deg, rgba(15, 23, 42, .86) 0%, rgba(15, 23, 42, .62) 100%),
      url('../images/hero-bg.png') center/cover no-repeat;
  }
  .chrome-hero__inner {
    grid-template-columns: 1fr;
    gap: 22px;
  }
  .chrome-hero h1 {
    font-size: 34px;
  }
  .chrome-hero__summary {
    font-size: 16px;
  }
  .chrome-hero__actions {
    display: grid;
    grid-template-columns: 1fr;
  }
  .chrome-hero__primary,
  .chrome-hero__secondary {
    width: 100%;
    min-width: 0;
  }
  .chrome-download-card {
    padding: 20px;
  }
}

@media (max-width: 480px) {
  .chrome-hero h1 {
    font-size: 30px;
  }
  .chrome-platform-grid {
    grid-template-columns: 1fr;
  }
}

/* ── 通用正文补充样式 ── */
.note {
  margin: 16px 0;
  padding: 12px 14px;
  border-left: 4px solid var(--blue);
  border-radius: 0 var(--radius) var(--radius) 0;
  background: #eff6ff;
  color: #475569;
  font-size: 14px;
}
.step-list {
  padding-left: 20px;
  margin: 16px 0;
}
.step-list li {
  margin-bottom: 10px;
}

/* ── 页面更新时间条 ── */
.page-update-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  justify-content: center;
  padding: 12px 20px 0;
  color: #64748b;
  font-size: 13px;
}
.page-update-bar span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.page-update-bar span + span::before {
  content: "";
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: #cbd5e1;
}