:root {
  --bg-canvas: #f6f7f9;
  --bg-surface: #ffffff;
  --bg-subtle: #f1f3f6;
  --text-primary: #111318;
  --text-secondary: #667085;
  --text-tertiary: #98a2b3;
  --border-default: #e7eaf0;
  --border-strong: #d8dee8;
  --brand-primary: #4f6ef7;
  --brand-primary-hover: #3f5ee8;
  --brand-soft: #eef2ff;
  --success-soft: #eaf7f1;
  --warning-soft: #fff6e8;
  --shadow-sm: 0 2px 8px rgba(16, 24, 40, 0.04);
  --radius-xl: 24px;
  --radius-lg: 20px;
  --radius-md: 16px;
  --radius-sm: 14px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--text-primary);
  background: var(--bg-canvas);
  line-height: 1.5;
}

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

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

.main {
  padding-bottom: 40px;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid var(--border-default);
  background: rgba(246, 247, 249, 0.92);
  backdrop-filter: blur(8px);
}

.topbar-inner {
  min-height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.brand-mark {
  width: 30px;
  height: 30px;
  border-radius: 10px;
  object-fit: cover;
  border: 1px solid var(--border-default);
}

.brand-text {
  font-size: 15px;
  line-height: 22px;
  font-weight: 600;
}

.topnav {
  display: flex;
  gap: 20px;
  font-size: 13px;
  color: var(--text-secondary);
}

.topnav a:hover {
  color: var(--text-primary);
}

.section {
  padding: 48px 0;
}

.section-subtle {
  border-top: 1px solid var(--border-default);
  border-bottom: 1px solid var(--border-default);
  background: var(--bg-subtle);
}

.hero {
  padding-top: 56px;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(300px, 0.9fr);
  gap: 24px;
}

.hero-copy h1 {
  margin: 8px 0 16px;
  font-size: clamp(30px, 4.2vw, 42px);
  line-height: 1.2;
  font-weight: 600;
}

.eyebrow {
  margin: 0;
  font-size: 12px;
  line-height: 16px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-tertiary);
}

.lead {
  margin: 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 22px;
  color: var(--text-secondary);
}

.actions {
  margin-top: 24px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.btn {
  min-height: 44px;
  padding: 10px 16px;
  border-radius: var(--radius-md);
  font-size: 15px;
  line-height: 22px;
  font-weight: 500;
  border: 1px solid transparent;
}

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

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

.btn-secondary {
  background: var(--bg-surface);
  border-color: var(--border-default);
  color: var(--text-secondary);
}

.surface {
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.feature-panel {
  padding: 20px;
}

.feature-panel h2 {
  margin: 0 0 12px;
  font-size: 18px;
  line-height: 24px;
}

.feature-panel ul {
  margin: 0;
  padding-left: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.feature-panel li {
  font-size: 15px;
  color: var(--text-secondary);
}

.chip {
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  padding: 0 10px;
  margin-right: 8px;
  border-radius: 999px;
  font-size: 12px;
  line-height: 16px;
  font-weight: 500;
}

.chip-brand {
  background: var(--brand-soft);
  color: var(--brand-primary);
}

.chip-success {
  background: var(--success-soft);
  color: #2f9e73;
}

.chip-warning {
  background: var(--warning-soft);
  color: #c98a2e;
}

.section-head h2 {
  margin: 0;
  font-size: 28px;
  line-height: 34px;
  font-weight: 600;
}

.section-head p {
  margin: 12px 0 0;
  max-width: 72ch;
  font-size: 15px;
  line-height: 22px;
  color: var(--text-secondary);
}

.metrics {
  margin-top: 24px;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.metric {
  padding: 16px 18px;
}

.metric-label {
  margin: 0;
  font-size: 12px;
  line-height: 16px;
  color: var(--text-tertiary);
}

.metric-value {
  margin: 8px 0 6px;
  font-variant-numeric: tabular-nums;
  font-size: 22px;
  line-height: 28px;
  font-weight: 600;
}

.metric-note {
  margin: 0;
  color: var(--text-secondary);
  font-size: 13px;
  line-height: 18px;
}

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

.route-grid {
  margin-top: 24px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.route-card {
  padding: 20px;
}

.route-kicker {
  margin: 0 0 8px;
  color: var(--text-tertiary);
  font-size: 12px;
  line-height: 16px;
  font-variant-numeric: tabular-nums;
}

.route-card h3 {
  margin: 0 0 8px;
  font-size: 18px;
  line-height: 24px;
}

.route-card p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 15px;
  line-height: 22px;
}

.card {
  padding: 20px;
}

.card h3 {
  margin: 0 0 10px;
  font-size: 18px;
  line-height: 24px;
}

.card p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 15px;
  line-height: 22px;
}

.timeline {
  margin-top: 24px;
  display: grid;
  gap: 18px;
}

.timeline-group {
  display: grid;
  gap: 8px;
}

.timeline-title {
  margin: 0;
  font-size: 13px;
  line-height: 18px;
  color: var(--text-tertiary);
}

.timeline-row {
  padding: 16px;
  display: grid;
  grid-template-columns: 20px minmax(0, 1fr);
  gap: 14px;
}

.dot {
  width: 10px;
  height: 10px;
  margin-top: 7px;
  border-radius: 999px;
  background: #cad2e2;
}

.dot-strong {
  background: var(--brand-primary);
}

.timeline-row h3 {
  margin: 0;
  font-size: 18px;
  line-height: 24px;
}

.time {
  margin: 3px 0 8px;
  font-size: 12px;
  line-height: 16px;
  color: var(--text-tertiary);
}

.timeline-row p {
  margin: 0;
  color: var(--text-secondary);
}

.contact {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 360px);
  gap: 24px;
  align-items: center;
}

.contact-box {
  padding: 18px 20px;
}

.contact-box p {
  margin: 0;
  color: var(--text-secondary);
}

.contact-box p + p {
  margin-top: 10px;
}

.footer {
  border-top: 1px solid var(--border-default);
  padding: 20px 0 24px;
}

.footer-inner {
  color: var(--text-tertiary);
  font-size: 13px;
  line-height: 18px;
}

@media (max-width: 980px) {
  .metrics {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

@media (max-width: 860px) {
  .topnav {
    display: none;
  }

  .hero-grid,
  .contact {
    grid-template-columns: 1fr;
  }
}