/* ============================================================
   Chrome 安全下载站 - 根站点样式
   设计方向：清爽简约风 | 白底 + Chrome 蓝 | 安全下载中心
   ============================================================ */

:root {
  --c-primary: #1a73e8;
  --c-primary-dark: #1558b0;
  --c-primary-light: #e8f0fe;
  --c-accent: #34a853;
  --c-warn: #fbbc05;
  --c-red: #ea4335;
  --c-text: #202124;
  --c-text-soft: #5f6368;
  --c-border: #e3e6ea;
  --c-bg: #ffffff;
  --c-bg-soft: #f6f8fb;
  --radius-s: 8px;
  --radius-m: 14px;
  --radius-l: 22px;
  --shadow-s: 0 1px 3px rgba(32, 33, 36, 0.08);
  --shadow-m: 0 8px 24px rgba(32, 33, 36, 0.08);
  --shadow-l: 0 16px 40px rgba(26, 115, 232, 0.14);
  --container: 1180px;
  font-size: 16px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: var(--c-text);
  background: var(--c-bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

img, svg { display: block; max-width: 100%; }

a { color: inherit; text-decoration: none; }

ul, ol { list-style: none; }

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- Header / Nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid var(--c-border);
  backdrop-filter: saturate(180%) blur(6px);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 19px;
  font-weight: 700;
  color: var(--c-text);
}

.brand svg { width: 30px; height: 30px; }

.brand-name b { color: var(--c-primary); }

.nav-list {
  display: flex;
  align-items: center;
  gap: 6px;
}

.nav-list a {
  display: inline-block;
  padding: 9px 18px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 500;
  color: var(--c-text-soft);
  transition: background 0.2s ease, color 0.2s ease;
}

.nav-list a:hover { background: var(--c-primary-light); color: var(--c-primary-dark); }

.nav-list a.active {
  background: var(--c-primary);
  color: #fff;
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px !important;
  border-radius: 999px;
  background: var(--c-text) !important;
  color: #fff !important;
  font-weight: 600 !important;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 15px 32px;
  font-size: 16px;
  font-weight: 600;
  border-radius: var(--radius-s);
  border: none;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
  font-family: inherit;
}

.btn:disabled { opacity: 0.75; cursor: progress; }

.btn-lg { padding: 18px 40px; font-size: 17px; }

.btn-primary {
  background: var(--c-primary);
  color: #fff;
  box-shadow: var(--shadow-l);
}

.btn-primary:hover { background: var(--c-primary-dark); transform: translateY(-2px); }

.btn-outline {
  background: #fff;
  color: var(--c-primary);
  border: 1.5px solid var(--c-primary);
}

.btn-outline:hover { background: var(--c-primary-light); transform: translateY(-2px); }

.btn-ghost {
  background: var(--c-bg-soft);
  color: var(--c-text);
  border: 1px solid var(--c-border);
}

.btn-ghost:hover { background: #eef1f5; }

.btn-block { width: 100%; }

/* ---------- Hero ---------- */
.hero {
  padding: 78px 0 60px;
  text-align: center;
  background: linear-gradient(180deg, #f2f7fe 0%, #ffffff 100%);
  border-bottom: 1px solid var(--c-border);
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 16px;
  border-radius: 999px;
  background: var(--c-primary-light);
  color: var(--c-primary-dark);
  font-size: 13.5px;
  font-weight: 600;
  margin-bottom: 22px;
}

.hero h1 {
  font-size: 46px;
  line-height: 1.28;
  font-weight: 800;
  letter-spacing: -0.5px;
  max-width: 820px;
  margin: 0 auto 20px;
}

.hero h1 span { color: var(--c-primary); }

.hero p.lead {
  font-size: 18px;
  color: var(--c-text-soft);
  max-width: 660px;
  margin: 0 auto 34px;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 30px;
}

.hero-chips {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  font-size: 13.5px;
  color: var(--c-text-soft);
}

.hero-chips span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: 999px;
  background: #fff;
  border: 1px solid var(--c-border);
}

.hero-chips svg { width: 15px; height: 15px; color: var(--c-accent); }

/* ---------- Section shell ---------- */
.section { padding: 76px 0; }
.section-soft { background: var(--c-bg-soft); }

.section-head { text-align: center; max-width: 680px; margin: 0 auto 48px; }

.section-eyebrow {
  font-size: 13.5px;
  font-weight: 700;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  color: var(--c-primary);
  margin-bottom: 10px;
  display: block;
}

.section-head h2 { font-size: 32px; font-weight: 800; margin-bottom: 14px; }

.section-head p { color: var(--c-text-soft); font-size: 16px; }

/* ---------- Feature cards ---------- */
.grid-6 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }

.feature-card {
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--radius-m);
  padding: 30px 26px;
  box-shadow: var(--shadow-s);
  transition: box-shadow 0.2s ease, transform 0.2s ease;
}

.feature-card:hover { box-shadow: var(--shadow-m); transform: translateY(-3px); }

.icon-badge {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-s);
  background: var(--c-primary-light);
  color: var(--c-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
}

.icon-badge svg { width: 26px; height: 26px; }

.feature-card h3 { font-size: 18px; font-weight: 700; margin-bottom: 10px; }

.feature-card p { color: var(--c-text-soft); font-size: 14.5px; }

/* ---------- Platform grid ---------- */
.platform-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 18px; }

.platform-card {
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--radius-m);
  padding: 26px 18px;
  text-align: center;
}

.platform-card .icon-badge { margin: 0 auto 16px; background: var(--c-bg-soft); color: var(--c-text); }

.platform-card h3 { font-size: 16px; margin-bottom: 6px; }

.platform-card p { font-size: 13px; color: var(--c-text-soft); margin-bottom: 16px; min-height: 54px; }

.platform-card .btn { width: 100%; padding: 11px; font-size: 14px; }

/* ---------- Deep feature rows ---------- */
.deep-row {
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 22px;
  padding: 30px 0;
  border-bottom: 1px solid var(--c-border);
}

.deep-row:last-child { border-bottom: none; }

.deep-row .num {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: var(--c-primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 18px;
}

.deep-row h3 { font-size: 20px; margin-bottom: 8px; }
.deep-row p { color: var(--c-text-soft); font-size: 15px; max-width: 820px; }

/* ---------- Stats ---------- */
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; text-align: center; }

.stat-item {
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--radius-m);
  padding: 32px 16px;
}

.stat-item .num { font-size: 34px; font-weight: 800; color: var(--c-primary); margin-bottom: 8px; }

.stat-item .label { font-size: 14px; color: var(--c-text-soft); }

/* ---------- Testimonials ---------- */
.testi-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }

.testi-card {
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--radius-m);
  padding: 26px;
}

.testi-stars { display: flex; gap: 3px; color: var(--c-warn); margin-bottom: 12px; }
.testi-stars svg { width: 16px; height: 16px; }

.testi-card p { font-size: 14.5px; color: var(--c-text-soft); margin-bottom: 16px; }

.testi-user { display: flex; align-items: center; gap: 10px; }

.testi-avatar {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--c-primary-light);
  color: var(--c-primary-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 14px;
}

.testi-user b { display: block; font-size: 14px; }
.testi-user span { font-size: 12.5px; color: var(--c-text-soft); }

/* ---------- Compare table ---------- */
.compare-table { width: 100%; border-collapse: collapse; background: #fff; border-radius: var(--radius-m); overflow: hidden; box-shadow: var(--shadow-s); }

.compare-table th, .compare-table td {
  padding: 16px 18px;
  border-bottom: 1px solid var(--c-border);
  font-size: 14.5px;
  text-align: center;
}

.compare-table th { background: var(--c-bg-soft); font-weight: 700; }

.compare-table td:first-child, .compare-table th:first-child { text-align: left; font-weight: 600; }

.compare-table .col-chrome { background: var(--c-primary-light); color: var(--c-primary-dark); font-weight: 700; }

.compare-table tr:last-child td { border-bottom: none; }

.tick { color: var(--c-accent); }
.dash { color: var(--c-text-soft); }

/* ---------- Use cases ---------- */
.usecase-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }

.usecase-card {
  padding: 26px 20px;
  border-radius: var(--radius-m);
  background: #fff;
  border: 1px solid var(--c-border);
}

.usecase-card .icon-badge { background: var(--c-bg-soft); color: var(--c-primary); }
.usecase-card h3 { font-size: 16px; margin-bottom: 8px; }
.usecase-card p { font-size: 14px; color: var(--c-text-soft); }

/* ---------- FAQ ---------- */
.faq-list { max-width: 820px; margin: 0 auto; }

.faq-item {
  border-bottom: 1px solid var(--c-border);
  padding: 20px 0;
}

.faq-item summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 16.5px;
  font-weight: 700;
}

.faq-item summary::-webkit-details-marker { display: none; }

.faq-item summary .chev { width: 18px; height: 18px; color: var(--c-text-soft); transition: transform 0.2s ease; flex-shrink: 0; }

.faq-item[open] summary .chev { transform: rotate(180deg); }

.faq-item p { color: var(--c-text-soft); font-size: 14.5px; margin-top: 12px; padding-right: 26px; }

/* ---------- Download page specific ---------- */
.dl-hero {
  background: var(--c-bg-soft);
  border-bottom: 1px solid var(--c-border);
  padding: 60px 0;
}

.dl-hero-box {
  display: grid;
  grid-template-columns: 100px 1fr auto;
  align-items: center;
  gap: 26px;
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--radius-l);
  padding: 34px;
  box-shadow: var(--shadow-m);
}

.dl-hero-box .win-icon {
  width: 88px;
  height: 88px;
  border-radius: var(--radius-m);
  background: var(--c-primary-light);
  color: var(--c-primary);
  display: flex;
  align-items: center;
  justify-content: center;
}

.dl-hero-box .win-icon svg { width: 46px; height: 46px; }

.dl-meta { display: flex; gap: 18px; flex-wrap: wrap; margin-top: 10px; font-size: 13.5px; color: var(--c-text-soft); }
.dl-meta span { display: inline-flex; align-items: center; gap: 6px; }
.dl-meta svg { width: 15px; height: 15px; }

.steps-list { counter-reset: step; }

.step-item {
  position: relative;
  padding-left: 60px;
  padding-bottom: 34px;
  border-left: 2px dashed var(--c-border);
  margin-left: 20px;
}

.step-item:last-child { border-left-color: transparent; padding-bottom: 0; }

.step-item::before {
  counter-increment: step;
  content: counter(step);
  position: absolute;
  left: -21px;
  top: 0;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--c-primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
}

.step-item h3 { font-size: 17px; margin-bottom: 6px; }
.step-item p { color: var(--c-text-soft); font-size: 14.5px; }

.req-table { width: 100%; border-collapse: collapse; }
.req-table th, .req-table td { padding: 14px 16px; border: 1px solid var(--c-border); font-size: 14px; text-align: left; }
.req-table th { background: var(--c-bg-soft); }

.log-item { display: flex; gap: 20px; padding: 22px 0; border-bottom: 1px solid var(--c-border); }
.log-item:last-child { border-bottom: none; }
.log-ver { flex-shrink: 0; width: 150px; }
.log-ver b { display: block; font-size: 16px; }
.log-ver span { font-size: 13px; color: var(--c-text-soft); }
.log-item ul { font-size: 14.5px; color: var(--c-text-soft); }
.log-item li { position: relative; padding-left: 16px; margin-bottom: 6px; }
.log-item li::before { content: ""; position: absolute; left: 0; top: 9px; width: 5px; height: 5px; border-radius: 50%; background: var(--c-primary); }

.secure-box {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.secure-box .feature-card { text-align: center; }
.secure-box .icon-badge { margin: 0 auto 16px; }

/* ---------- zh-cn article page ---------- */
.article-wrap { display: grid; grid-template-columns: 1fr 260px; gap: 46px; align-items: start; }

.article-body h2 { font-size: 25px; margin: 40px 0 16px; font-weight: 800; }
.article-body h2:first-child { margin-top: 0; }
.article-body h3 { font-size: 19px; margin: 26px 0 10px; font-weight: 700; }
.article-body p { color: var(--c-text-soft); font-size: 15.5px; margin-bottom: 14px; }
.article-body ul, .article-body ol { margin: 0 0 16px; padding-left: 22px; color: var(--c-text-soft); font-size: 15.5px; }
.article-body li { margin-bottom: 8px; list-style: disc; }
.article-body ol li { list-style: decimal; }

.kbd { display: inline-block; padding: 2px 8px; border-radius: 6px; background: var(--c-bg-soft); border: 1px solid var(--c-border); font-family: Consolas, monospace; font-size: 13px; }

.cta-banner {
  background: linear-gradient(120deg, var(--c-primary), #4f8ff0);
  border-radius: var(--radius-l);
  padding: 40px;
  text-align: center;
  color: #fff;
  margin: 40px 0;
}
.cta-banner h3 { font-size: 24px; margin-bottom: 10px; }
.cta-banner p { color: rgba(255,255,255,0.9); margin-bottom: 22px; }
.cta-banner .btn-outline { background: #fff; border-color: #fff; }

.toc-box {
  position: sticky;
  top: 90px;
  background: var(--c-bg-soft);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-m);
  padding: 22px;
}
.toc-box h4 { font-size: 14px; margin-bottom: 14px; text-transform: uppercase; letter-spacing: 0.5px; color: var(--c-text-soft); }
.toc-box a { display: block; font-size: 14px; padding: 7px 0; color: var(--c-text); border-bottom: 1px dashed var(--c-border); }
.toc-box a:last-child { border-bottom: none; }
.toc-box a:hover { color: var(--c-primary); }

/* ---------- Footer ---------- */
.site-footer {
  background: var(--c-text);
  color: #d3d6db;
  padding: 50px 0 28px;
}

.footer-top {
  display: flex;
  justify-content: space-between;
  gap: 30px;
  flex-wrap: wrap;
  padding-bottom: 30px;
  border-bottom: 1px solid rgba(255,255,255,0.12);
  margin-bottom: 22px;
}

.footer-brand { display: flex; align-items: center; gap: 10px; color: #fff; font-weight: 700; font-size: 18px; }
.footer-brand svg { width: 26px; height: 26px; }

.footer-security { display: flex; align-items: center; gap: 10px; font-size: 14px; }
.footer-security svg { width: 20px; height: 20px; color: var(--c-accent); flex-shrink: 0; }

.footer-bottom { text-align: center; font-size: 13px; color: #9aa0a6; line-height: 1.9; }

/* ---------- Spin keyframe (required) ---------- */
@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .grid-6 { grid-template-columns: repeat(2, 1fr); }
  .platform-grid { grid-template-columns: repeat(3, 1fr); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .testi-grid { grid-template-columns: repeat(2, 1fr); }
  .usecase-grid { grid-template-columns: repeat(2, 1fr); }
  .article-wrap { grid-template-columns: 1fr; }
  .toc-box { position: static; }
  .secure-box { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 720px) {
  .nav-list { display: none; }
  .hero h1 { font-size: 32px; }
  .hero p.lead { font-size: 15.5px; }
  .grid-6, .platform-grid, .stats-grid, .testi-grid, .usecase-grid, .secure-box { grid-template-columns: 1fr; }
  .compare-table { display: block; overflow-x: auto; }
  .dl-hero-box { grid-template-columns: 1fr; text-align: center; }
  .dl-hero-box .win-icon { margin: 0 auto; }
  .deep-row { grid-template-columns: 1fr; }
  .footer-top { flex-direction: column; }
  .section { padding: 52px 0; }
}