:root {
  --blue: #1a73e8;
  --blue-hover: #1557b0;
  --text: #202124;
  --muted: #5f6368;
  --bg: #ffffff;
  --gray: #f8f9fa;
  --line: #dadce0;
  --radius: 8px;
  --wrap: 1120px;
}

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

html {
  scroll-behavior: auto;
}

body {
  margin: 0;
  color: var(--text);
  background: var(--bg);
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.75;
}

img,
svg {
  display: block;
}

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

a:hover {
  text-decoration: underline;
}

.wrap {
  width: min(var(--wrap), calc(100% - 40px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: #ffffff;
  border-bottom: 1px solid var(--line);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 68px;
  gap: 20px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-weight: 600;
  font-size: 18px;
  letter-spacing: 0.01em;
  text-decoration: none;
  flex-shrink: 0;
}

.brand:hover {
  text-decoration: none;
  color: var(--text);
}

.brand-logo {
  width: 36px;
  height: 36px;
  flex-shrink: 0;
}

.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #ffffff;
  color: var(--text);
  cursor: pointer;
}

.nav-toggle svg {
  margin: auto;
}

.site-nav ul {
  display: flex;
  align-items: center;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-nav a {
  display: inline-block;
  padding: 8px 14px;
  border-radius: var(--radius);
  color: var(--text);
  text-decoration: none;
}

.site-nav a:hover {
  background: var(--gray);
  text-decoration: none;
}

.site-nav a.is-current {
  color: var(--blue);
  background: #e8f0fe;
  font-weight: 600;
}

.hero {
  padding: 56px 0 64px;
  background: #ffffff;
  border-bottom: 1px solid var(--line);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 48px;
  align-items: start;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--blue);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

h1 {
  margin: 0 0 18px;
  font-size: 34px;
  line-height: 1.35;
  font-weight: 650;
}

h2 {
  margin: 0 0 16px;
  font-size: 26px;
  line-height: 1.4;
  font-weight: 650;
}

h3 {
  margin: 0 0 10px;
  font-size: 18px;
  line-height: 1.45;
}

.lead,
.section p,
.card p,
.quote p,
.faq-item p,
.prose p {
  color: var(--text);
}

.lead {
  margin: 0 0 16px;
  font-size: 17px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 24px 0 8px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 10px 22px;
  border-radius: var(--radius);
  background: var(--blue);
  color: #ffffff;
  font-weight: 600;
  text-decoration: none;
  border: none;
}

.btn:hover {
  background: var(--blue-hover);
  color: #ffffff;
  text-decoration: none;
}

.btn-ghost {
  background: #ffffff;
  color: var(--blue);
  border: 1px solid var(--blue);
}

.btn-ghost:hover {
  background: #e8f0fe;
  color: var(--blue);
}

.note {
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 14px;
}

.checklist {
  background: var(--gray);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 24px 26px 20px;
}

.checklist h2,
.checklist .check-title {
  margin: 0 0 14px;
  font-size: 18px;
}

.checklist ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.checklist li {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  padding: 12px 0;
  border-top: 1px solid var(--line);
  color: var(--text);
  font-size: 15px;
}

.checklist li:first-of-type {
  border-top: none;
  padding-top: 4px;
}

.checklist svg {
  flex-shrink: 0;
  margin-top: 2px;
}

.section {
  padding: 56px 0;
  background: #ffffff;
}

.section-alt {
  background: var(--gray);
}

.section-intro {
  max-width: 820px;
  margin-bottom: 28px;
}

.section-intro p + p,
.prose p + p,
.stack p + p {
  margin-top: 14px;
}

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

.card {
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 22px 22px 20px;
}

.section-alt .card {
  background: #ffffff;
}

.card-icon {
  width: 40px;
  height: 40px;
  margin-bottom: 14px;
  color: var(--blue);
}

.card h3 {
  margin-bottom: 8px;
}

.card p {
  margin: 0 0 10px;
  font-size: 15px;
}

.card p:last-child {
  margin-bottom: 0;
}

.platforms {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.platform {
  display: flex;
  flex-direction: column;
  gap: 10px;
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 22px;
}

.platform-head {
  display: flex;
  align-items: center;
  gap: 12px;
}

.platform h3 {
  margin: 0;
}

.platform p {
  margin: 0;
  font-size: 15px;
}

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

.quote {
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 22px;
}

.quote h3 {
  font-size: 16px;
}

.quote .role {
  margin: 0 0 12px;
  color: var(--muted);
  font-size: 13px;
}

.quote p {
  margin: 0 0 10px;
  font-size: 15px;
}

.stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin: 24px 0;
}

.stat {
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 18px 20px;
}

.stat strong {
  display: block;
  color: var(--blue);
  font-size: 26px;
  line-height: 1.2;
  margin-bottom: 6px;
}

.stat span {
  color: var(--muted);
  font-size: 14px;
}

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #ffffff;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
}

th,
td {
  padding: 12px 14px;
  text-align: left;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

th {
  background: #e8f0fe;
  color: var(--text);
  font-weight: 600;
}

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

.faq-list {
  display: grid;
  gap: 12px;
}

.faq-item {
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 4px 18px 8px;
}

.faq-item summary {
  cursor: pointer;
  padding: 14px 0;
  font-weight: 600;
  list-style: none;
}

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

.faq-item summary::after {
  content: "+";
  float: right;
  color: var(--blue);
  font-weight: 500;
}

.faq-item[open] summary::after {
  content: "-";
}

.faq-item p {
  margin: 0 0 12px;
  font-size: 15px;
}

.download-hero-cta {
  margin-top: 8px;
}

.steps {
  display: grid;
  gap: 16px;
}

.step {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 14px;
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 18px 20px;
}

.step-num {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: #e8f0fe;
  color: var(--blue);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
}

.req-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.prose {
  max-width: 820px;
}

.prose h3 {
  margin-top: 28px;
}

.cta-band {
  margin-top: 28px;
  padding: 22px 24px;
  background: #e8f0fe;
  border-radius: 12px;
  border: 1px solid #d2e3fc;
}

.site-footer {
  background: #ffffff;
  border-top: 1px solid var(--line);
  padding: 28px 0 36px;
  color: var(--muted);
  font-size: 14px;
}

.site-footer p {
  margin: 0 0 8px;
}

.site-footer p:last-child {
  margin-bottom: 0;
}

@media (max-width: 800px) {
  .header-inner {
    flex-wrap: wrap;
    min-height: 60px;
  }

  .nav-toggle {
    display: inline-flex;
    margin-left: auto;
  }

  .site-nav {
    display: none;
    width: 100%;
    padding-bottom: 12px;
  }

  .site-nav.is-open {
    display: block;
  }

  .site-nav ul {
    flex-direction: column;
    align-items: stretch;
  }

  h1 {
    font-size: 28px;
  }

  h2 {
    font-size: 22px;
  }

  .hero,
  .section {
    padding: 40px 0;
  }

  .hero-grid,
  .cards-3,
  .quotes,
  .stats,
  .platforms,
  .req-grid {
    grid-template-columns: 1fr;
  }

  .step {
    grid-template-columns: 1fr;
  }
}