/* ============================
   Reset & Base
   ============================ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body { font-family: 'Segoe UI', Arial, sans-serif; color: #202124; background: #fff; line-height: 1.6; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
img { max-width: 100%; display: block; }
button { cursor: pointer; font-family: inherit; border: none; outline: none; }

@keyframes spin { from { transform: rotate(0deg); } to { transform: rotate(360deg); } }
@keyframes fadeUp { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }
@keyframes pulse { 0%,100% { transform: scale(1); } 50% { transform: scale(1.04); } }

.container { max-width: 1120px; margin: 0 auto; padding: 0 24px; }

/* ============================
   Navigation
   ============================ */
.nav-wrap {
  position: sticky; top: 0; z-index: 100;
  background: #fff;
  border-bottom: 1px solid #e8eaed;
  box-shadow: 0 1px 6px rgba(0,0,0,.06);
}
.nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 64px; gap: 16px;
}
.nav-logo {
  display: flex; align-items: center; gap: 10px;
  font-size: 1.05rem; font-weight: 700; color: #202124;
  white-space: nowrap;
}
.nav-logo svg { width: 36px; height: 36px; flex-shrink: 0; }
.nav-links {
  display: flex; align-items: center; gap: 4px;
}
.nav-links a {
  padding: 8px 14px; border-radius: 6px; font-size: .92rem; font-weight: 500;
  color: #5f6368; transition: background .15s, color .15s;
}
.nav-links a:hover { background: #f1f3f4; color: #202124; }
.nav-links a.active {
  color: #1a73e8; background: #e8f0fe; font-weight: 600;
}
.nav-dl-btn {
  background: #1a73e8; color: #fff !important;
  padding: 9px 20px !important; border-radius: 24px !important;
  font-weight: 600 !important; font-size: .9rem !important;
  transition: background .15s, box-shadow .15s !important;
}
.nav-dl-btn:hover { background: #1557b0 !important; box-shadow: 0 2px 8px rgba(26,115,232,.35) !important; }
.nav-burger {
  display: none; background: none; border: none; padding: 6px; border-radius: 6px;
  color: #5f6368; cursor: pointer;
}
.nav-burger svg { width: 24px; height: 24px; }
.nav-burger:hover { background: #f1f3f4; }

/* ============================
   Hero — Split panel
   ============================ */
.hero {
  background: linear-gradient(135deg, #f8f9ff 0%, #eef2ff 50%, #f0fdf4 100%);
  padding: 72px 0 60px;
  overflow: hidden;
}
.hero-inner {
  display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center;
}
.hero-badge {
  display: inline-flex; align-items: center; gap: 6px;
  background: #fff; border: 1.5px solid #d2e3fc; border-radius: 20px;
  padding: 5px 14px; font-size: .82rem; font-weight: 600; color: #1a73e8;
  margin-bottom: 20px;
}
.hero-badge svg { width: 14px; height: 14px; }
.hero h1 {
  font-size: 2.8rem; font-weight: 800; line-height: 1.18; color: #202124;
  margin-bottom: 18px;
  letter-spacing: -.5px;
}
.hero h1 .accent { color: #1a73e8; }
.hero-desc { font-size: 1.05rem; color: #5f6368; margin-bottom: 32px; max-width: 480px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; align-items: center; }
.btn-primary {
  display: inline-flex; align-items: center; gap: 8px;
  background: #1a73e8; color: #fff; font-size: 1rem; font-weight: 600;
  padding: 14px 28px; border-radius: 30px;
  transition: background .15s, transform .15s, box-shadow .15s;
  box-shadow: 0 2px 10px rgba(26,115,232,.3);
}
.btn-primary:hover { background: #1557b0; transform: translateY(-1px); box-shadow: 0 6px 18px rgba(26,115,232,.4); }
.btn-primary svg { width: 18px; height: 18px; }
.btn-secondary {
  display: inline-flex; align-items: center; gap: 8px;
  background: #fff; color: #1a73e8; font-size: .95rem; font-weight: 600;
  padding: 13px 24px; border-radius: 30px; border: 1.5px solid #1a73e8;
  transition: background .15s, transform .15s;
}
.btn-secondary:hover { background: #e8f0fe; transform: translateY(-1px); }
.btn-secondary svg { width: 16px; height: 16px; }
.hero-note { margin-top: 14px; font-size: .82rem; color: #80868b; display: flex; align-items: center; gap: 6px; }
.hero-note svg { width: 14px; height: 14px; color: #34a853; }

.hero-visual {
  display: flex; align-items: center; justify-content: center; position: relative;
}
.hero-browser {
  width: 100%; max-width: 460px; background: #fff; border-radius: 14px;
  box-shadow: 0 8px 40px rgba(0,0,0,.12); overflow: hidden;
  animation: fadeUp .7s ease both;
}
.browser-bar {
  background: #f1f3f4; padding: 10px 14px;
  display: flex; align-items: center; gap: 10px;
}
.browser-dots { display: flex; gap: 6px; }
.browser-dots span {
  width: 11px; height: 11px; border-radius: 50%;
}
.browser-dots span:nth-child(1) { background: #ea4335; }
.browser-dots span:nth-child(2) { background: #fbbc04; }
.browser-dots span:nth-child(3) { background: #34a853; }
.browser-url {
  flex: 1; background: #fff; border-radius: 20px;
  padding: 5px 14px; font-size: .78rem; color: #5f6368;
  display: flex; align-items: center; gap: 6px;
}
.browser-url svg { width: 13px; height: 13px; color: #34a853; flex-shrink: 0; }
.browser-content { padding: 24px; }
.browser-content-row {
  display: flex; align-items: center; gap: 12px; padding: 10px 0;
  border-bottom: 1px solid #f1f3f4;
}
.browser-content-row:last-child { border-bottom: none; }
.bc-icon {
  width: 36px; height: 36px; border-radius: 8px;
  display: flex; align-items: center; justify-content: center; flex-shrink: 0;
}
.bc-icon.blue { background: #e8f0fe; }
.bc-icon.green { background: #e6f4ea; }
.bc-icon.red { background: #fce8e6; }
.bc-icon svg { width: 18px; height: 18px; }
.bc-text h5 { font-size: .88rem; font-weight: 600; color: #202124; margin-bottom: 2px; }
.bc-text p { font-size: .78rem; color: #80868b; }

/* ============================
   Stats bar
   ============================ */
.stats-bar {
  background: #1a73e8; color: #fff; padding: 28px 0;
}
.stats-inner {
  display: flex; flex-wrap: wrap; justify-content: space-around; gap: 16px;
}
.stat-item { text-align: center; }
.stat-item strong { display: block; font-size: 2rem; font-weight: 800; line-height: 1; }
.stat-item span { font-size: .85rem; opacity: .85; margin-top: 4px; display: block; }

/* ============================
   Section utilities
   ============================ */
.section { padding: 72px 0; }
.section-gray { padding: 72px 0; background: #f8f9fa; }
.section-blue { padding: 72px 0; background: linear-gradient(135deg, #e8f0fe 0%, #d2e3fc 100%); }

.sec-title-block { text-align: center; margin-bottom: 52px; }
.sec-eyebrow {
  display: inline-block; font-size: .8rem; font-weight: 700; letter-spacing: .08em;
  text-transform: uppercase; color: #1a73e8; margin-bottom: 12px;
}
.sec-title-block h2 { font-size: 2rem; font-weight: 800; color: #202124; margin-bottom: 12px; }
.sec-title-block p { font-size: 1rem; color: #5f6368; max-width: 560px; margin: 0 auto; }

/* ============================
   Feature icon grid (4-col)
   ============================ */
.feature-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px;
}
.feat-card {
  background: #fff; border: 1px solid #e8eaed; border-radius: 14px;
  padding: 28px 22px; transition: box-shadow .2s, transform .2s;
}
.feat-card:hover { box-shadow: 0 6px 24px rgba(0,0,0,.08); transform: translateY(-3px); }
.feat-icon {
  width: 52px; height: 52px; border-radius: 14px; margin-bottom: 16px;
  display: flex; align-items: center; justify-content: center;
}
.feat-icon.blue { background: #e8f0fe; }
.feat-icon.green { background: #e6f4ea; }
.feat-icon.red { background: #fce8e6; }
.feat-icon.yellow { background: #fef7e0; }
.feat-icon.purple { background: #f3e8fd; }
.feat-icon.teal { background: #e6f7fa; }
.feat-icon.orange { background: #fef0e6; }
.feat-icon.pink { background: #fde8f0; }
.feat-icon svg { width: 26px; height: 26px; }
.feat-card h3 { font-size: .98rem; font-weight: 700; color: #202124; margin-bottom: 8px; }
.feat-card p { font-size: .87rem; color: #5f6368; line-height: 1.6; }

/* ============================
   Why-Chrome — alternating rows
   ============================ */
.why-list { display: flex; flex-direction: column; gap: 64px; }
.why-row {
  display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center;
}
.why-row.reverse { direction: rtl; }
.why-row.reverse > * { direction: ltr; }
.why-visual {
  border-radius: 18px; overflow: hidden;
  background: #f8f9fa; padding: 36px;
  display: flex; align-items: center; justify-content: center;
  min-height: 220px;
}
.why-body h3 { font-size: 1.5rem; font-weight: 800; color: #202124; margin-bottom: 14px; }
.why-body p { font-size: .97rem; color: #5f6368; margin-bottom: 16px; line-height: 1.7; }
.why-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.why-tag {
  background: #e8f0fe; color: #1a73e8; font-size: .78rem; font-weight: 600;
  padding: 4px 12px; border-radius: 12px;
}
.why-tag.green { background: #e6f4ea; color: #137333; }
.why-tag.red { background: #fce8e6; color: #c5221f; }

/* ============================
   Timeline install steps
   ============================ */
.timeline { max-width: 760px; margin: 0 auto; position: relative; }
.timeline::before {
  content: ''; position: absolute; left: 28px; top: 0; bottom: 0;
  width: 2px; background: linear-gradient(to bottom, #1a73e8, #34a853, #fbbc04, #ea4335);
  border-radius: 2px;
}
.tl-step {
  display: flex; gap: 24px; align-items: flex-start;
  padding: 0 0 40px 0; position: relative;
}
.tl-step:last-child { padding-bottom: 0; }
.tl-dot {
  width: 58px; height: 58px; border-radius: 50%; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.3rem; font-weight: 800; color: #fff; position: relative; z-index: 1;
  box-shadow: 0 3px 12px rgba(0,0,0,.15);
}
.tl-dot.c1 { background: #1a73e8; }
.tl-dot.c2 { background: #34a853; }
.tl-dot.c3 { background: #fbbc04; color: #333; }
.tl-dot.c4 { background: #ea4335; }
.tl-body {
  background: #fff; border: 1px solid #e8eaed; border-radius: 14px;
  padding: 22px 24px; flex: 1; margin-top: 8px;
}
.tl-body h4 { font-size: 1.02rem; font-weight: 700; color: #202124; margin-bottom: 8px; }
.tl-body p { font-size: .9rem; color: #5f6368; line-height: 1.65; }
.tl-body code {
  background: #f1f3f4; padding: 2px 7px; border-radius: 4px;
  font-size: .85rem; color: #202124;
}
.tl-body .tl-tip {
  margin-top: 10px; padding: 9px 14px; background: #e8f0fe;
  border-radius: 8px; font-size: .83rem; color: #1a73e8; display: flex; gap: 8px; align-items: flex-start;
}
.tl-tip svg { width: 15px; height: 15px; flex-shrink: 0; margin-top: 1px; }

/* ============================
   Platform download cards
   ============================ */
.platform-grid {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px;
}
.plat-card {
  background: #fff; border: 2px solid #e8eaed; border-radius: 18px;
  padding: 32px 28px; display: flex; flex-direction: column; align-items: flex-start;
  transition: border-color .2s, box-shadow .2s;
}
.plat-card:hover { border-color: #1a73e8; box-shadow: 0 6px 24px rgba(26,115,232,.1); }
.plat-card.featured-plat {
  border-color: #1a73e8; background: linear-gradient(135deg, #f0f5ff 0%, #e8f0fe 100%);
  grid-column: span 2;
  flex-direction: row; align-items: center; gap: 32px;
}
.plat-badge {
  display: inline-flex; align-items: center; gap: 5px;
  background: #1a73e8; color: #fff; font-size: .75rem; font-weight: 700;
  padding: 4px 12px; border-radius: 12px; margin-bottom: 14px; letter-spacing: .03em;
}
.plat-badge svg { width: 12px; height: 12px; }
.plat-icon { width: 64px; height: 64px; margin-bottom: 16px; flex-shrink: 0; }
.featured-plat .plat-icon { width: 80px; height: 80px; margin-bottom: 0; }
.plat-info { flex: 1; }
.plat-card h3 { font-size: 1.15rem; font-weight: 700; color: #202124; margin-bottom: 6px; }
.plat-card .plat-ver { font-size: .85rem; color: #80868b; margin-bottom: 16px; }
.plat-card ul { margin-bottom: 20px; }
.plat-card ul li {
  font-size: .87rem; color: #5f6368; padding: 3px 0;
  display: flex; align-items: center; gap: 8px;
}
.plat-card ul li::before {
  content: ''; display: inline-block; width: 6px; height: 6px;
  border-radius: 50%; background: #34a853; flex-shrink: 0;
}
.btn-dl-win {
  display: inline-flex; align-items: center; gap: 8px;
  background: #1a73e8; color: #fff; font-size: 1.02rem; font-weight: 700;
  padding: 14px 30px; border-radius: 30px;
  transition: background .15s, transform .15s, box-shadow .15s;
  box-shadow: 0 2px 10px rgba(26,115,232,.3);
}
.btn-dl-win:hover { background: #1557b0; transform: translateY(-1px); }
.btn-dl-win svg { width: 18px; height: 18px; }
.btn-dl-out {
  display: inline-flex; align-items: center; gap: 8px;
  background: #fff; color: #1a73e8; font-size: .93rem; font-weight: 600;
  padding: 11px 22px; border-radius: 24px; border: 1.5px solid #1a73e8;
  transition: background .15s, transform .15s;
}
.btn-dl-out:hover { background: #e8f0fe; transform: translateY(-1px); }
.btn-dl-out svg { width: 16px; height: 16px; }

/* ============================
   Spec accordion
   ============================ */
.spec-tabs {
  display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 28px;
}
.spec-tab {
  padding: 9px 20px; border-radius: 20px; font-size: .88rem; font-weight: 600;
  border: 1.5px solid #e8eaed; color: #5f6368; background: #fff;
  cursor: pointer; transition: all .15s;
}
.spec-tab.active, .spec-tab:hover {
  background: #1a73e8; color: #fff; border-color: #1a73e8;
}
.spec-panel { display: none; }
.spec-panel.active { display: block; }
.spec-table { width: 100%; border-collapse: collapse; }
.spec-table tr { border-bottom: 1px solid #e8eaed; }
.spec-table tr:last-child { border-bottom: none; }
.spec-table td { padding: 14px 16px; font-size: .9rem; }
.spec-table td:first-child { color: #80868b; width: 200px; font-weight: 500; }
.spec-table td:last-child { color: #202124; font-weight: 600; }

/* ============================
   Review cards
   ============================ */
.review-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px;
}
.review-card {
  background: #fff; border-radius: 16px; padding: 26px;
  box-shadow: 0 2px 14px rgba(0,0,0,.06);
  display: flex; flex-direction: column; gap: 14px;
}
.review-stars { display: flex; gap: 3px; }
.review-stars svg { width: 17px; height: 17px; fill: #fbbc04; stroke: none; }
.review-text { font-size: .9rem; color: #3c4043; line-height: 1.65; flex: 1; }
.review-author { display: flex; align-items: center; gap: 12px; }
.review-avatar {
  width: 40px; height: 40px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 1rem; font-weight: 700; color: #fff; flex-shrink: 0;
}
.av-b { background: #1a73e8; }
.av-g { background: #34a853; }
.av-r { background: #ea4335; }
.av-y { background: #f9ab00; }
.av-p { background: #a142f4; }
.av-t { background: #12b5cb; }
.review-name { font-size: .9rem; font-weight: 700; color: #202124; }
.review-role { font-size: .78rem; color: #80868b; }

/* ============================
   FAQ accordion
   ============================ */
.faq-grid {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px;
}
.faq-item { border: 1px solid #e8eaed; border-radius: 12px; overflow: hidden; }
.faq-q {
  width: 100%; display: flex; justify-content: space-between; align-items: center;
  padding: 18px 20px; background: #fff; font-size: .93rem; font-weight: 600; color: #202124;
  text-align: left; gap: 12px; transition: background .15s;
}
.faq-q:hover { background: #f8f9fa; }
.faq-q svg { width: 18px; height: 18px; flex-shrink: 0; transition: transform .25s; color: #5f6368; }
.faq-item.open .faq-q { color: #1a73e8; background: #f0f5ff; }
.faq-item.open .faq-q svg { transform: rotate(180deg); color: #1a73e8; }
.faq-body { max-height: 0; overflow: hidden; transition: max-height .35s ease; }
.faq-body-inner {
  padding: 0 20px 18px; font-size: .89rem; color: #5f6368; line-height: 1.7;
  border-top: 1px solid #e8eaed;
}

/* ============================
   CTA Banner
   ============================ */
.cta-section {
  background: linear-gradient(135deg, #1a73e8 0%, #0d47a1 100%);
  padding: 64px 0; text-align: center; color: #fff;
}
.cta-section h2 { font-size: 2rem; font-weight: 800; margin-bottom: 14px; }
.cta-section p { font-size: 1rem; opacity: .85; margin-bottom: 32px; }
.btn-cta {
  display: inline-flex; align-items: center; gap: 10px;
  background: #fff; color: #1a73e8; font-size: 1.05rem; font-weight: 700;
  padding: 16px 36px; border-radius: 32px;
  box-shadow: 0 4px 20px rgba(0,0,0,.2);
  transition: transform .15s, box-shadow .15s;
}
.btn-cta:hover { transform: translateY(-2px); box-shadow: 0 8px 30px rgba(0,0,0,.25); }
.btn-cta svg { width: 20px; height: 20px; }

/* ============================
   Article / prose (zh-cn)
   ============================ */
.prose-wrap { max-width: 820px; margin: 0 auto; }
.prose-wrap h2 { font-size: 1.45rem; font-weight: 800; color: #202124; margin: 36px 0 14px; }
.prose-wrap h3 { font-size: 1.1rem; font-weight: 700; color: #202124; margin: 24px 0 10px; }
.prose-wrap p { font-size: .97rem; color: #3c4043; line-height: 1.8; margin-bottom: 16px; }
.prose-wrap ul { margin-bottom: 16px; padding-left: 4px; }
.prose-wrap ul li {
  font-size: .95rem; color: #3c4043; line-height: 1.7; padding: 3px 0 3px 22px; position: relative;
}
.prose-wrap ul li::before {
  content: ''; position: absolute; left: 4px; top: 12px;
  width: 6px; height: 6px; border-radius: 50%; background: #1a73e8;
}
.prose-wrap .highlight-box {
  background: #e8f0fe; border-left: 4px solid #1a73e8; border-radius: 0 10px 10px 0;
  padding: 16px 20px; margin: 24px 0;
}
.prose-wrap .highlight-box p { margin: 0; color: #174ea6; }
.version-list { display: flex; flex-direction: column; gap: 12px; margin-bottom: 24px; }
.version-item {
  background: #f8f9fa; border-radius: 10px; padding: 14px 18px;
  display: flex; align-items: flex-start; gap: 14px;
}
.ver-num {
  background: #1a73e8; color: #fff; font-size: .78rem; font-weight: 700;
  padding: 3px 10px; border-radius: 10px; white-space: nowrap; flex-shrink: 0;
}
.ver-desc { font-size: .88rem; color: #5f6368; line-height: 1.6; }

.page-hero {
  background: linear-gradient(135deg, #f0f5ff 0%, #e8f0fe 100%);
  padding: 56px 0 44px; text-align: center;
}
.page-hero .sec-eyebrow { margin-bottom: 10px; }
.page-hero h1 { font-size: 2.2rem; font-weight: 800; color: #202124; margin-bottom: 14px; }
.page-hero p { font-size: 1.02rem; color: #5f6368; max-width: 540px; margin: 0 auto; }

/* ============================
   Footer
   ============================ */
.site-footer {
  background: #202124; color: #9aa0a6; padding: 36px 0 28px;
}
.footer-inner { text-align: center; }
.footer-safe {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(52,168,83,.15); border: 1px solid rgba(52,168,83,.3);
  border-radius: 20px; padding: 8px 18px; font-size: .85rem; color: #81c995;
  margin-bottom: 16px;
}
.footer-safe svg { width: 16px; height: 16px; color: #34a853; flex-shrink: 0; }
.footer-copy { font-size: .8rem; color: #5f6368; line-height: 1.6; }

/* ============================
   Responsive
   ============================ */
@media (max-width: 900px) {
  .hero-inner { grid-template-columns: 1fr; }
  .hero-visual { display: none; }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .why-row { grid-template-columns: 1fr; }
  .why-row.reverse { direction: ltr; }
  .why-visual { display: none; }
  .review-grid { grid-template-columns: repeat(2, 1fr); }
  .faq-grid { grid-template-columns: 1fr; }
  .platform-grid { grid-template-columns: 1fr; }
  .plat-card.featured-plat { grid-column: span 1; flex-direction: column; }
  .featured-plat .plat-icon { margin-bottom: 16px; }
}
@media (max-width: 600px) {
  .hero h1 { font-size: 2rem; }
  .nav-links { display: none; }
  .nav-links.open {
    display: flex; flex-direction: column; align-items: flex-start;
    position: absolute; top: 64px; left: 0; right: 0;
    background: #fff; padding: 12px 16px 16px; border-bottom: 1px solid #e8eaed;
    box-shadow: 0 8px 20px rgba(0,0,0,.08); z-index: 99;
  }
  .nav-burger { display: flex; }
  .feature-grid { grid-template-columns: 1fr; }
  .review-grid { grid-template-columns: 1fr; }
  .stats-inner { gap: 24px; }
  .stat-item strong { font-size: 1.6rem; }
  .timeline::before { left: 22px; }
  .tl-dot { width: 46px; height: 46px; font-size: 1.1rem; }
}