:root {
  --bg: #0a1120;
  --panel: #101a30;
  --panel-soft: #f4f7fb;
  --text: #172033;
  --text-soft: #5f6b85;
  --line: rgba(23, 32, 51, 0.1);
  --brand: #1d6fff;
  --brand-dark: #0f46b8;
  --white: #ffffff;
  --shadow: 0 20px 50px rgba(13, 26, 52, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Microsoft YaHei", "PingFang SC", "Segoe UI", sans-serif;
  color: var(--text);
  background: #ffffff;
}

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

.container {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.92);
  border-bottom: 1px solid rgba(23, 32, 51, 0.06);
  backdrop-filter: blur(10px);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 76px;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  color: var(--white);
  background: linear-gradient(135deg, var(--brand), #51a3ff);
  font-weight: 700;
  letter-spacing: 0.08em;
}

.brand-text {
  display: flex;
  flex-direction: column;
}

.brand-text strong {
  font-size: 18px;
}

.brand-text small {
  color: var(--text-soft);
  font-size: 12px;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 28px;
  color: var(--text-soft);
  font-size: 14px;
}

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

.hero {
  position: relative;
  overflow: hidden;
  padding: 88px 0 72px;
  background:
    radial-gradient(circle at top right, rgba(29, 111, 255, 0.16), transparent 28%),
    linear-gradient(180deg, #f7faff 0%, #ffffff 100%);
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(320px, 420px);
  gap: 48px;
  align-items: center;
}

.eyebrow,
.section-tag {
  margin: 0 0 14px;
  color: var(--brand);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.hero h1,
.section h2,
.dark h2 {
  margin: 0;
  line-height: 1.2;
}

.hero h1 {
  font-size: clamp(34px, 5vw, 54px);
}

.hero-text,
.section-copy p,
.card p,
.timeline-item p,
.cta-box p,
.site-footer p {
  line-height: 1.8;
  color: var(--text-soft);
}

.hero-text {
  margin: 24px 0 0;
  max-width: 720px;
  font-size: 16px;
}

.hero-actions {
  display: flex;
  gap: 14px;
  margin-top: 28px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 124px;
  padding: 14px 22px;
  border-radius: 999px;
  font-weight: 700;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.button:hover {
  transform: translateY(-1px);
}

.button-primary {
  color: var(--white);
  background: linear-gradient(135deg, var(--brand), var(--brand-dark));
  box-shadow: 0 16px 32px rgba(29, 111, 255, 0.25);
}

.button-secondary {
  color: var(--brand);
  background: rgba(29, 111, 255, 0.08);
}

.hero-points {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 20px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
  color: var(--text);
  font-size: 14px;
}

.hero-points li::before {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  margin-right: 10px;
  border-radius: 50%;
  background: var(--brand);
}

.hero-card {
  display: grid;
  gap: 16px;
}

.metric-card,
.card {
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.88);
  box-shadow: var(--shadow);
}

.metric-card span {
  display: inline-block;
  margin-bottom: 12px;
  color: var(--brand);
  font-size: 13px;
  font-weight: 700;
}

.metric-card strong,
.card h3,
.timeline-item h3,
.site-footer h3,
.site-footer h4 {
  display: block;
  margin: 0;
  color: var(--text);
}

.metric-card strong {
  font-size: 24px;
}

.metric-card p {
  margin: 12px 0 0;
  color: var(--text-soft);
  line-height: 1.7;
}

.section {
  padding: 92px 0;
}

.muted {
  background: var(--panel-soft);
}

.section-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 40px;
  align-items: start;
}

.section-copy p:first-child {
  margin-top: 0;
}

.cards {
  display: grid;
  gap: 24px;
  margin-top: 34px;
}

.cards-three {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.card h3 {
  margin-bottom: 12px;
  font-size: 22px;
}

.timeline {
  display: grid;
  gap: 18px;
  margin-top: 34px;
}

.timeline-item {
  display: grid;
  grid-template-columns: 88px 1fr;
  gap: 24px;
  align-items: start;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 22px;
}

.timeline-index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 72px;
  height: 72px;
  border-radius: 20px;
  color: var(--brand);
  background: rgba(29, 111, 255, 0.08);
  font-size: 24px;
  font-weight: 800;
}

.dark {
  color: var(--white);
  background: linear-gradient(135deg, var(--bg), #132446);
}

.dark .section-tag,
.light {
  color: #8fc0ff;
}

.dark h2,
.dark p {
  color: var(--white);
}

.cta-box {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.site-footer {
  padding: 42px 0 24px;
  background: #09101d;
  color: rgba(255, 255, 255, 0.78);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr 1fr;
  gap: 28px;
}

.site-footer h3,
.site-footer h4,
.site-footer a {
  color: var(--white);
}

.footer-bottom {
  margin-top: 28px;
  padding-top: 18px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 13px;
}

@media (max-width: 980px) {
  .hero-grid,
  .section-grid,
  .cards-three,
  .footer-grid,
  .cta-box {
    grid-template-columns: 1fr;
  }

  .cta-box {
    align-items: flex-start;
  }
}

@media (max-width: 720px) {
  .site-nav {
    display: none;
  }

  .hero {
    padding-top: 64px;
  }

  .section,
  .dark {
    padding: 72px 0;
  }

  .timeline-item {
    grid-template-columns: 1fr;
  }

  .timeline-index {
    width: 58px;
    height: 58px;
    border-radius: 16px;
    font-size: 20px;
  }
}