:root {
  --blue: #1a73e8;
  --blue-dark: #1967d2;
  --ink: #202124;
  --grey: #5f6368;
  --line: #e8eaed;
  --soft: #f8f9fa;
  --white: #fff;
  --green: #1e8e3e;
  --red: #d93025;
  --yellow: #f9ab00;
  --radius-card: 24px;
  --radius-pill: 999px;
  --shadow-card: 0 2px 6px rgba(60, 64, 67, .12), 0 8px 24px rgba(60, 64, 67, .08);
  --font: "Google Sans", "Google Sans Text", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --max: 1200px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink);
  background: var(--white);
  -webkit-font-smoothing: antialiased;
}

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

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

h1, h2, h3, h4 { margin: 0; font-weight: 700; letter-spacing: -.02em; }

p { margin: 0; }

.page { overflow-x: hidden; }

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(255, 255, 255, .92);
  backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color .2s ease, box-shadow .2s ease;
}

.site-header.is-scrolled {
  border-bottom-color: var(--line);
  box-shadow: 0 1px 2px rgba(60, 64, 67, .08);
}

.header-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 12px 24px;
  display: flex;
  align-items: center;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 18px;
  letter-spacing: -.01em;
  flex-shrink: 0;
}

.brand-name { white-space: nowrap; }

.nav-desktop {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: auto;
}

.nav-desktop a {
  padding: 8px 14px;
  border-radius: var(--radius-pill);
  font-size: 15px;
  font-weight: 500;
  color: var(--grey);
  transition: background .18s ease, color .18s ease;
}

.nav-desktop a:hover { background: #f1f3f4; color: var(--ink); }

.header-actions { display: flex; align-items: center; gap: 12px; }

.header-link {
  font-size: 15px;
  font-weight: 500;
  color: var(--blue-dark);
  padding: 8px 4px;
}

.header-link:hover { text-decoration: underline; text-underline-offset: 4px; }

.menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: 0;
  background: transparent;
  border-radius: 50%;
  cursor: pointer;
  padding: 10px;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
}

.menu-toggle span {
  display: block;
  height: 2px;
  width: 22px;
  margin: 0 auto;
  background: var(--ink);
  border-radius: 2px;
}

.mobile-menu {
  display: none;
  border-top: 1px solid var(--line);
  padding: 8px 24px 20px;
  background: #fff;
}

.mobile-menu a {
  display: block;
  padding: 12px 4px;
  font-size: 16px;
  font-weight: 500;
  color: var(--ink);
  border-bottom: 1px solid #f1f3f4;
}

.mobile-menu a:last-child { border-bottom: 0; }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 12px 30px;
  border-radius: var(--radius-pill);
  font-size: 17px;
  font-weight: 500;
  line-height: 1.2;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform .18s ease, box-shadow .18s ease, background .18s ease;
}

.btn-primary {
  background: var(--blue);
  color: #fff;
  box-shadow: 0 1px 2px rgba(26, 115, 232, .3);
}

.btn-primary:hover {
  background: var(--blue-dark);
  box-shadow: 0 4px 14px rgba(26, 115, 232, .35);
  transform: translateY(-1px);
}

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--blue-dark);
  font-weight: 500;
  font-size: 17px;
}

.link-arrow span { transition: transform .18s ease; }
.link-arrow:hover span { transform: translateX(4px); }

/* Hero */
.hero {
  position: relative;
  max-width: var(--max);
  margin: 0 auto;
  padding: 72px 24px 56px;
  text-align: center;
}

.hero-glow {
  position: absolute;
  inset: -40px 10% auto;
  height: 520px;
  background:
    radial-gradient(38% 45% at 18% 40%, rgba(66, 133, 244, .20), transparent 70%),
    radial-gradient(34% 42% at 82% 32%, rgba(234, 67, 53, .14), transparent 70%),
    radial-gradient(40% 42% at 50% 8%, rgba(251, 188, 5, .16), transparent 72%),
    radial-gradient(34% 40% at 70% 78%, rgba(52, 168, 83, .14), transparent 70%);
  filter: blur(6px);
  z-index: -1;
  pointer-events: none;
}

.hero-logo { margin: 0 auto 26px; width: 72px; height: 72px; }

.hero h1 {
  font-size: clamp(44px, 6.4vw, 76px);
  line-height: 1.12;
  letter-spacing: -.035em;
  max-width: 16em;
  margin: 0 auto;
}

.pill {
  display: inline-block;
  padding: 0 .16em;
  border-radius: .28em;
  color: #fff;
  transform: translateY(-.02em);
}

.pill-blue { background: #1a73e8; }
.pill-red { background: #ea4335; }

.hero-sub {
  max-width: 46em;
  margin: 24px auto 0;
  font-size: clamp(17px, 1.6vw, 20px);
  color: var(--grey);
  line-height: 1.65;
}

.hero-actions {
  margin-top: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
  flex-wrap: wrap;
}

.hero-platforms {
  margin-top: 20px;
  font-size: 14px;
  color: var(--grey);
  letter-spacing: .02em;
}

.hero-visual { margin: 56px auto 0; max-width: 980px; }

.browser-mock {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 20px;
  box-shadow: 0 20px 60px rgba(60, 64, 67, .18), 0 2px 8px rgba(60, 64, 67, .08);
  overflow: hidden;
  text-align: left;
}

.mock-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px 0;
  background: #f1f3f4;
}

.dots { display: inline-flex; gap: 6px; margin-right: 8px; }
.dots i { width: 10px; height: 10px; border-radius: 50%; background: #dadce0; display: block; }
.dots i:nth-child(1) { background: #f28b82; }
.dots i:nth-child(2) { background: #fdd663; }
.dots i:nth-child(3) { background: #81c995; }

.mock-tab {
  font-size: 13px;
  color: var(--grey);
  padding: 10px 16px;
  border-radius: 12px 12px 0 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 190px;
}

.mock-tab.is-active { background: #fff; color: var(--ink); font-weight: 500; }
.mock-plus { color: var(--grey); font-size: 18px; padding: 0 4px; }

.mock-toolbar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 16px;
  background: #fff;
  border-bottom: 1px solid var(--line);
}

.mock-nav { color: #9aa0a6; font-size: 15px; }

.mock-omnibox {
  flex: 1;
  background: #f1f3f4;
  border-radius: var(--radius-pill);
  padding: 8px 18px;
  font-size: 13px;
  color: var(--grey);
}

.mock-page {
  background: #fff;
  padding: 46px 24px 52px;
  text-align: center;
}

.mock-logo { display: flex; justify-content: center; margin-bottom: 20px; }

.mock-search {
  max-width: 520px;
  margin: 0 auto;
  border: 1px solid #dfe1e5;
  border-radius: var(--radius-pill);
  padding: 12px 22px;
  font-size: 14px;
  color: #9aa0a6;
  text-align: left;
  box-shadow: 0 1px 6px rgba(32, 33, 36, .08);
}

.mock-tiles {
  margin: 30px auto 0;
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

.mock-tiles span {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: #f1f3f4;
  display: block;
}

.mock-tiles span:nth-child(2) { background: #e8f0fe; }
.mock-tiles span:nth-child(3) { background: #fce8e6; }
.mock-tiles span:nth-child(4) { background: #fef7e0; }
.mock-tiles span:nth-child(5) { background: #e6f4ea; }

.mock-colorbar { display: flex; height: 4px; }
.mock-colorbar i { flex: 1; }
.mock-colorbar i:nth-child(1) { background: #4285f4; }
.mock-colorbar i:nth-child(2) { background: #ea4335; }
.mock-colorbar i:nth-child(3) { background: #fbbc05; }
.mock-colorbar i:nth-child(4) { background: #34a853; }

/* Sections */
.section {
  max-width: var(--max);
  margin: 0 auto;
  padding: 88px 24px;
}

.section-soft { background: var(--soft); max-width: none; }
.section-soft > * { max-width: var(--max); margin-left: auto; margin-right: auto; }

.section-grey { background: var(--soft); max-width: none; }
.section-grey > * { max-width: var(--max); margin-left: auto; margin-right: auto; }

.section-head { max-width: 44em; margin-bottom: 44px; }

.kicker {
  display: inline-block;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: .08em;
  color: var(--blue-dark);
  margin-bottom: 14px;
  text-transform: uppercase;
}

.section-head h2 {
  font-size: clamp(30px, 4vw, 48px);
  line-height: 1.15;
  letter-spacing: -.03em;
  margin-bottom: 16px;
}

.section-head p { color: var(--grey); font-size: 18px; }

.grid { display: grid; gap: 24px; }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }

.card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  padding: 32px;
  box-shadow: 0 1px 2px rgba(60, 64, 67, .06);
  transition: transform .2s ease, box-shadow .2s ease;
}

.card:hover { transform: translateY(-2px); box-shadow: var(--shadow-card); }

.card h3 { font-size: 22px; margin-bottom: 10px; letter-spacing: -.015em; }
.card p { color: var(--grey); }

.card-visual { padding: 0; overflow: hidden; display: flex; flex-direction: column; }

.card-media {
  background: #eef1f6;
  overflow: hidden;
}

.card-media img { width: 100%; height: 240px; object-fit: cover; }
.card-media-tall img { height: 300px; object-fit: contain; background: #f1f3f4; padding: 18px; }

.card-copy { padding: 26px 30px 30px; }
.card-copy h3 { font-size: 21px; margin-bottom: 8px; }
.card-copy p { color: var(--grey); }

.check-list { list-style: none; margin: 20px 0 0; padding: 0; display: grid; gap: 12px; }
.check-list li {
  position: relative;
  padding-left: 30px;
  color: var(--grey);
}
.check-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  top: 0;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: #e6f4ea;
  color: var(--green);
  font-size: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
}

/* AI */
.ai-layout {
  display: grid;
  grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr);
  gap: 56px;
  align-items: center;
}

.feature-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 30px; }
.feature-list h3 { font-size: 21px; margin-bottom: 8px; }
.feature-list p { color: var(--grey); }

.ai-copy .link-arrow { margin-top: 32px; }

.ai-media { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.ai-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 20px;
  border: 1px solid var(--line);
  box-shadow: var(--shadow-card);
}
.ai-media img:nth-child(2) { margin-top: 32px; }

/* Safety icons */
.icon-badge {
  width: 48px;
  height: 48px;
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  margin-bottom: 22px;
}
.icon-blue { background: #e8f0fe; color: #1a73e8; }
.icon-green { background: #e6f4ea; color: #1e8e3e; }
.icon-yellow { background: #fef7e0; color: #b06000; }

/* Extensions */
.extensions {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 48px;
  align-items: center;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 28px;
  padding: 48px;
  box-shadow: var(--shadow-card);
}

.extension-copy h3 { font-size: 28px; margin-bottom: 12px; letter-spacing: -.02em; }
.extension-copy p { color: var(--grey); font-size: 17px; }

.extension-icons {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  justify-content: center;
  align-items: center;
}

.extension-icons img {
  width: 84px;
  height: 84px;
  object-fit: contain;
  background: #f8f9fa;
  border-radius: 20px;
  padding: 12px;
  border: 1px solid var(--line);
}

/* FAQ */
.faq-list { max-width: 860px; }

.faq-item {
  border-bottom: 1px solid var(--line);
  padding: 4px 0;
}

.faq-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 22px 4px;
  font-size: 18px;
  font-weight: 500;
  cursor: pointer;
  list-style: none;
}

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

.faq-plus {
  font-size: 24px;
  font-weight: 400;
  color: var(--grey);
  transition: transform .2s ease;
  line-height: 1;
}

.faq-item[open] .faq-plus { transform: rotate(45deg); }

.faq-body {
  padding: 0 4px 24px;
  color: var(--grey);
  font-size: 16px;
  max-width: 62em;
}

/* Closing */
.closing { padding-top: 24px; padding-bottom: 96px; }

.closing-card {
  background: linear-gradient(120deg, #e8f0fe 0%, #fef7e0 55%, #e6f4ea 100%);
  border-radius: 28px;
  padding: 52px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  flex-wrap: wrap;
}

.closing-card h2 { font-size: clamp(26px, 3vw, 38px); margin-bottom: 12px; letter-spacing: -.025em; }
.closing-card p { color: #3c4043; max-width: 40em; font-size: 17px; }
.closing-card .link-arrow { background: #fff; padding: 14px 26px; border-radius: var(--radius-pill); box-shadow: 0 2px 6px rgba(60, 64, 67, .12); }

/* Footer */
.site-footer {
  border-top: 1px solid var(--line);
  background: #f8f9fa;
  padding: 56px 24px 32px;
}

.footer-inner {
  max-width: var(--max);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  gap: 48px;
  flex-wrap: wrap;
}

.footer-brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 17px; }

.footer-cols { display: flex; gap: 72px; flex-wrap: wrap; }
.footer-cols h4 { font-size: 14px; letter-spacing: .04em; color: var(--ink); margin-bottom: 14px; text-transform: uppercase; }
.footer-cols a { display: block; color: var(--grey); font-size: 15px; padding: 6px 0; }
.footer-cols a:hover { color: var(--blue-dark); }

.footer-bottom {
  max-width: var(--max);
  margin: 40px auto 0;
  padding-top: 24px;
  border-top: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  color: var(--grey);
  font-size: 13px;
}

/* Reveal */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .6s ease, transform .6s ease; }
.reveal.is-visible { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .btn, .card, .link-arrow span { transition: none; }
}

/* Tablet */
@media (max-width: 960px) {
  .nav-desktop { display: none; }
  .header-link { display: none; }
  .menu-toggle { display: flex; }
  .header-actions { margin-left: auto; }
  .mobile-menu.is-open { display: block; }

  .grid-2, .grid-3, .ai-layout, .extensions { grid-template-columns: 1fr; }
  .ai-media img:nth-child(2) { margin-top: 0; }
  .extensions { padding: 32px; }
  .hero { padding-top: 52px; }
  .mock-page { padding: 34px 18px 40px; }
  .section { padding: 64px 20px; }
  .closing-card { padding: 34px; }
}

/* Mobile */
@media (max-width: 560px) {
  .header-inner { padding: 10px 16px; }
  .brand { font-size: 16px; }
  .hero { padding: 40px 18px 32px; }
  .hero h1 { font-size: 40px; }
  .hero-sub { font-size: 16px; }
  .hero-actions { gap: 16px; }
  .hero-actions .btn { width: 100%; }
  .hero-visual { margin-top: 36px; }
  .mock-tab { max-width: 120px; font-size: 12px; padding: 9px 10px; }
  .mock-toolbar { gap: 8px; padding: 8px 12px; }
  .mock-page { padding: 26px 14px 30px; }
  .mock-tiles span { width: 44px; height: 44px; }
  .section { padding: 52px 18px; }
  .section-head { margin-bottom: 30px; }
  .section-head p { font-size: 16px; }
  .card { padding: 24px; }
  .card-copy { padding: 22px; }
  .card-media img { height: 200px; }
  .card-media-tall img { height: 240px; }
  .extensions { padding: 26px; }
  .extension-icons img { width: 64px; height: 64px; }
  .faq-item summary { font-size: 16px; }
  .closing { padding-bottom: 64px; }
  .closing-card { padding: 28px 22px; }
  .closing-card .link-arrow { width: 100%; justify-content: center; }
  .footer-cols { gap: 36px; }
  .footer-bottom { flex-direction: column; }
}