:root {
  --blue: #1a73e8;
  --blue-deep: #1557b0;
  --ink: #202124;
  --muted: #5f6368;
  --line: #e8eaed;
  --soft: #f8f9fa;
  --card: #ffffff;
  --red: #ea4335;
  --yellow: #fbbc04;
  --green: #34a853;
  --radius: 12px;
}

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

html {
  font-size: 16px;
}

body {
  margin: 0;
  color: var(--ink);
  background: #fff;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.75;
}

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

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

p {
  margin: 0 0 16px;
  color: var(--ink);
}

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

h1,
h2,
h3 {
  line-height: 1.35;
  font-weight: 650;
  color: var(--ink);
}

h1 {
  font-size: 2rem;
  margin: 0 0 16px;
}

h2 {
  font-size: 1.5rem;
  margin: 0 0 18px;
}

h3 {
  font-size: 1.15rem;
  margin: 28px 0 12px;
}

.wrap {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
}

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

.nav-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
  gap: 16px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-weight: 700;
  letter-spacing: 0.01em;
}

.brand svg {
  flex: 0 0 28px;
}

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

.nav-links a {
  color: var(--muted);
  padding: 8px 12px;
  border-radius: 8px;
  font-weight: 500;
}

.nav-links a.is-on {
  color: var(--blue);
  background: #e8f0fe;
}

.nav-toggle {
  display: none;
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 8px;
  padding: 8px 10px;
  cursor: pointer;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 10px 18px;
  border-radius: 8px;
  font-weight: 600;
  border: 1px solid transparent;
}

.btn-primary {
  background: var(--blue);
  color: #fff;
}

.btn-primary:hover {
  background: var(--blue-deep);
}

.btn-ghost {
  background: #fff;
  color: var(--blue);
  border-color: #c5d8f7;
}

.btn-ghost:hover {
  background: #e8f0fe;
}

.hero {
  padding: 56px 0 28px;
  border-bottom: 1px solid var(--line);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 40px;
  align-items: center;
}

.lead {
  font-size: 1.05rem;
  color: var(--muted);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

.dl-card {
  background: var(--soft);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
}

.dl-card h2,
.dl-card .card-title {
  margin: 0 0 8px;
  font-size: 1.15rem;
}

.dl-meta {
  color: var(--muted);
  font-size: 0.92rem;
  margin-bottom: 16px;
}

.dl-list {
  display: grid;
  gap: 10px;
  margin: 16px 0 0;
}

.dl-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 10px 12px;
}

.dl-item span {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--ink);
  font-weight: 600;
}

.section {
  padding: 52px 0;
  border-bottom: 1px solid var(--line);
}

.section.soft {
  background: var(--soft);
}

.section-intro {
  color: var(--muted);
  margin-bottom: 24px;
}

.cards-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.card,
.feature-card,
.review-card,
.stat-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
}

.icon-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}

.icon-row strong {
  font-size: 1.05rem;
}

.platform-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.review-track {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(300px, 1fr);
  gap: 16px;
  overflow-x: auto;
  padding-bottom: 8px;
}

.review-card .who {
  font-weight: 700;
  margin-bottom: 4px;
}

.review-card .role {
  color: var(--muted);
  font-size: 0.9rem;
  margin-bottom: 12px;
}

.stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-bottom: 22px;
}

.stat-card b {
  display: block;
  color: var(--blue);
  font-size: 1.6rem;
  margin-bottom: 6px;
}

.compare {
  width: 100%;
  border-collapse: collapse;
  background: #fff;
}

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

.compare th {
  background: #e8f0fe;
  color: var(--ink);
}

.compare td:first-child {
  font-weight: 600;
  width: 22%;
}

.faq details {
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 10px;
  padding: 14px 16px;
  margin-bottom: 10px;
}

.faq summary {
  cursor: pointer;
  font-weight: 650;
}

.faq details p {
  margin-top: 10px;
  color: var(--muted);
}

.prose h3 + p {
  margin-top: 0;
}

.cta-band {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  border: 1px solid #c5d8f7;
  background: #e8f0fe;
  border-radius: var(--radius);
  padding: 20px 22px;
  margin-top: 28px;
}

.site-footer {
  background: #fff;
  border-top: 1px solid var(--line);
  padding: 28px 0 36px;
  color: var(--muted);
  font-size: 0.92rem;
}

.foot-verify {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  margin-bottom: 12px;
  color: var(--ink);
}

.fineprint {
  margin: 0;
}

@media (max-width: 920px) {
  .hero-grid,
  .cards-3,
  .platform-grid,
  .stats {
    grid-template-columns: 1fr;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .nav-links {
    display: none;
    position: absolute;
    left: 0;
    right: 0;
    top: 64px;
    background: #fff;
    border-bottom: 1px solid var(--line);
    padding: 10px 20px 16px;
    flex-direction: column;
    align-items: stretch;
  }

  .nav-links.is-open {
    display: flex;
  }

  .cta-band {
    flex-direction: column;
    align-items: flex-start;
  }

  h1 {
    font-size: 1.65rem;
  }
}