:root {
  --bg: #f5f8fc;
  --surface: #ffffff;
  --text: #172033;
  --muted: #5d6b82;
  --line: #d8e1ee;
  --brand: #2152ff;
  --brand-dark: #173cb8;
  --accent: #edf3ff;
  --shadow: 0 20px 60px rgba(18, 33, 66, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Inter", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}

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

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

.narrow {
  max-width: 760px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(16px);
  background: rgba(245, 248, 252, 0.9);
  border-bottom: 1px solid rgba(216, 225, 238, 0.7);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 76px;
  gap: 20px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--brand), #5b8cff);
  color: #fff;
  font-size: 12px;
  letter-spacing: 0.08em;
}

.menu {
  display: flex;
  gap: 24px;
  color: var(--muted);
  font-size: 14px;
}

.menu a:hover {
  color: var(--brand);
}

.hero {
  padding: 84px 0 56px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 32px;
  align-items: center;
}

.eyebrow,
.section-tag {
  display: inline-block;
  margin: 0 0 12px;
  padding: 6px 12px;
  border-radius: 999px;
  background: var(--accent);
  color: var(--brand);
  font-size: 13px;
  font-weight: 700;
}

.section-tag.light {
  background: rgba(255, 255, 255, 0.16);
  color: #dfe8ff;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  font-size: clamp(38px, 5vw, 62px);
  line-height: 1.08;
  margin-bottom: 18px;
}

h2 {
  font-size: clamp(28px, 3.4vw, 40px);
  line-height: 1.15;
  margin-bottom: 16px;
}

.hero-text,
.section p,
.card p,
.stat span,
.contact-box p {
  color: var(--muted);
  font-size: 17px;
}

.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-top: 30px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 140px;
  min-height: 48px;
  padding: 0 20px;
  border-radius: 14px;
  font-weight: 700;
}

.button.primary {
  background: var(--brand);
  color: #fff;
}

.button.primary:hover {
  background: var(--brand-dark);
}

.button.secondary {
  border: 1px solid var(--line);
  background: var(--surface);
}

.hero-card,
.card,
.stat {
  background: var(--surface);
  border: 1px solid rgba(216, 225, 238, 0.9);
  border-radius: 24px;
  box-shadow: var(--shadow);
}

.hero-card {
  padding: 28px;
}

.card-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 16px;
}

.hero-card ul {
  margin: 0;
  padding-left: 20px;
  color: var(--muted);
}

.section {
  padding: 72px 0;
}

.section.alt {
  background: #edf3fb;
}

.cards,
.stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 26px;
}

.card,
.stat {
  padding: 26px;
}

.contact-section {
  padding-bottom: 96px;
}

.contact-box {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 28px;
  padding: 36px;
  border-radius: 28px;
  background: linear-gradient(135deg, #13264a, #1e4ba7);
  color: #fff;
  box-shadow: var(--shadow);
}

.contact-box p,
.contact-list p {
  color: rgba(255, 255, 255, 0.86);
}

.contact-list strong {
  color: #fff;
}

.site-footer {
  padding: 28px 0 40px;
  border-top: 1px solid rgba(216, 225, 238, 0.7);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  color: var(--muted);
  font-size: 14px;
}

@media (max-width: 900px) {
  .hero-grid,
  .contact-box,
  .cards,
  .stats {
    grid-template-columns: 1fr;
  }

  .menu {
    display: none;
  }

  .hero {
    padding-top: 56px;
  }

  .footer-inner {
    flex-direction: column;
  }
}

@media (max-width: 560px) {
  .container {
    width: min(100% - 28px, 1120px);
  }

  .hero-card,
  .card,
  .stat,
  .contact-box {
    padding: 22px;
  }

  h1 {
    font-size: 34px;
  }
}