:root {
  --bg: #f4f7fb;
  --surface: #ffffff;
  --text: #172033;
  --muted: #64748b;
  --line: #e2e8f0;
  --brand: #0f766e;
  --brand-light: #14b8a6;
  --brand-soft: #ecfeff;
  --accent: #22c55e;
  --dark: #0f172a;
  --shadow: 0 24px 60px rgba(15, 23, 42, 0.08);
  --radius: 20px;
  --max: 1120px;
}

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

html {
  scroll-behavior: smooth;
}

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

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

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

.container {
  width: min(var(--max), calc(100% - 48px));
  margin: 0 auto;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(12px);
  background: rgba(255, 255, 255, 0.86);
  border-bottom: 1px solid rgba(226, 232, 240, 0.8);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
  gap: 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 800;
  font-size: 1.05rem;
}

.brand-mark {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  color: #fff;
  font-weight: 900;
  background: linear-gradient(135deg, var(--dark), var(--brand), var(--accent));
  box-shadow: 0 10px 24px rgba(15, 118, 110, 0.28);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  color: var(--muted);
  font-size: 0.95rem;
}

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

.nav-actions {
  display: flex;
  gap: 12px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 20px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-weight: 700;
  font-size: 0.92rem;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

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

.btn-primary {
  color: #fff;
  background: linear-gradient(135deg, var(--brand), var(--accent));
  box-shadow: 0 14px 30px rgba(20, 184, 166, 0.28);
}

.btn-secondary {
  color: var(--brand);
  background: var(--brand-soft);
  border-color: rgba(20, 184, 166, 0.18);
}

.menu-toggle {
  display: none;
  border: 0;
  background: transparent;
  font-size: 1.4rem;
  cursor: pointer;
}

/* Hero */
.hero {
  position: relative;
  overflow: hidden;
  padding: 88px 0 72px;
  color: #fff;
  background:
    radial-gradient(circle at 85% 15%, rgba(167, 243, 208, 0.28), transparent 28%),
    radial-gradient(circle at 10% 80%, rgba(56, 189, 248, 0.18), transparent 30%),
    linear-gradient(135deg, var(--dark) 0%, var(--brand) 52%, var(--accent) 100%);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 48px;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  padding: 8px 14px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.14);
  border: 1px solid rgba(255, 255, 255, 0.22);
  font-size: 0.88rem;
  margin-bottom: 18px;
}

.hero h1 {
  margin: 0 0 18px;
  font-size: clamp(2.2rem, 5vw, 3.6rem);
  line-height: 1.15;
  letter-spacing: -0.03em;
}

.hero-lead {
  margin: 0 0 28px;
  max-width: 560px;
  color: rgba(255, 255, 255, 0.82);
  font-size: 1.08rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 36px;
}

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

.stat {
  padding: 16px 18px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.14);
}

.stat strong {
  display: block;
  font-size: 1.5rem;
  line-height: 1.2;
}

.stat span {
  color: rgba(255, 255, 255, 0.72);
  font-size: 0.88rem;
}

.hero-panel {
  padding: 28px;
  border-radius: 28px;
  background: rgba(255, 255, 255, 0.94);
  color: var(--text);
  box-shadow: 0 32px 80px rgba(15, 23, 42, 0.22);
}

.panel-title {
  margin: 0 0 8px;
  font-size: 1.1rem;
  font-weight: 800;
}

.panel-sub {
  margin: 0 0 22px;
  color: var(--muted);
  font-size: 0.92rem;
}

.flow-list {
  display: grid;
  gap: 14px;
}

.flow-item {
  display: grid;
  grid-template-columns: 42px 1fr auto;
  gap: 14px;
  align-items: center;
  padding: 14px 16px;
  border-radius: 16px;
  background: var(--bg);
}

.flow-no {
  width: 42px;
  height: 42px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  font-weight: 800;
  color: var(--brand);
  background: var(--brand-soft);
}

.flow-item strong {
  display: block;
  margin-bottom: 2px;
}

.flow-item p {
  margin: 0;
  color: var(--muted);
  font-size: 0.88rem;
}

.flow-tag {
  padding: 6px 10px;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--brand);
  background: var(--brand-soft);
}

/* Sections */
section {
  padding: 88px 0;
}

.section-head {
  max-width: 720px;
  margin-bottom: 48px;
}

.section-head.center {
  margin-left: auto;
  margin-right: auto;
  text-align: center;
}

.eyebrow {
  display: inline-block;
  margin-bottom: 12px;
  color: var(--brand);
  font-size: 0.86rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.section-head h2 {
  margin: 0 0 14px;
  font-size: clamp(1.8rem, 3vw, 2.5rem);
  line-height: 1.2;
}

.section-head p {
  margin: 0;
  color: var(--muted);
  font-size: 1.02rem;
}

.cards-3,
.cards-2 {
  display: grid;
  gap: 22px;
}

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

.cards-2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.card {
  padding: 28px;
  border-radius: var(--radius);
  background: var(--surface);
  border: 1px solid rgba(226, 232, 240, 0.9);
  box-shadow: var(--shadow);
}

.card-icon {
  width: 52px;
  height: 52px;
  margin-bottom: 18px;
  border-radius: 16px;
  display: grid;
  place-items: center;
  font-size: 1.4rem;
  background: var(--brand-soft);
}

.card h3 {
  margin: 0 0 10px;
  font-size: 1.15rem;
}

.card p,
.card li {
  color: var(--muted);
  font-size: 0.95rem;
}

.card ul {
  margin: 14px 0 0;
  padding-left: 18px;
}

.card-plain {
  box-shadow: none;
  border: 1px solid var(--line);
}

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

.platform-card {
  padding: 32px;
  border-radius: 24px;
  background: linear-gradient(180deg, #ffffff 0%, #f8fafc 100%);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.platform-card.driver {
  border-top: 4px solid var(--brand-light);
}

.platform-card.admin {
  border-top: 4px solid var(--dark);
}

.platform-card h3 {
  margin: 0 0 8px;
  font-size: 1.35rem;
}

.platform-card .tagline {
  margin: 0 0 22px;
  color: var(--muted);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.feature-chip {
  padding: 12px 14px;
  border-radius: 14px;
  background: #fff;
  border: 1px solid var(--line);
  font-size: 0.92rem;
}

.timeline {
  display: grid;
  gap: 18px;
}

.timeline-step {
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 18px;
  align-items: start;
}

.timeline-step .step-no {
  font-size: 2rem;
  font-weight: 900;
  color: rgba(15, 118, 110, 0.18);
  line-height: 1;
}

.metrics {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

.metric {
  padding: 24px;
  border-radius: 18px;
  text-align: center;
  background: var(--surface);
  border: 1px solid var(--line);
}

.metric strong {
  display: block;
  font-size: 1.8rem;
  color: var(--brand);
  margin-bottom: 6px;
}

.cta {
  padding: 72px 0;
}

.cta-box {
  padding: 48px;
  border-radius: 28px;
  color: #fff;
  text-align: center;
  background:
    linear-gradient(135deg, rgba(15, 23, 42, 0.92), rgba(15, 118, 110, 0.92)),
    linear-gradient(135deg, var(--dark), var(--brand));
  box-shadow: var(--shadow);
}

.cta-box h2 {
  margin: 0 0 12px;
  font-size: clamp(1.8rem, 3vw, 2.4rem);
}

.cta-box p {
  margin: 0 auto 28px;
  max-width: 640px;
  color: rgba(255, 255, 255, 0.82);
}

.cta-actions {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 14px;
}

.site-footer {
  padding: 36px 0 48px;
  color: var(--muted);
  font-size: 0.92rem;
}

.footer-grid {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}

.footer-links {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

/* Mobile */
@media (max-width: 960px) {
  .hero-grid,
  .split,
  .cards-3,
  .cards-2,
  .metrics,
  .feature-grid {
    grid-template-columns: 1fr;
  }

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

  .nav-links,
  .nav-actions {
    display: none;
  }

  .nav-links.open,
  .nav-actions.open {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    width: 100%;
  }

  .nav.open {
    flex-wrap: wrap;
    padding-bottom: 16px;
  }

  .menu-toggle {
    display: block;
  }

  section {
    padding: 64px 0;
  }

  .cta-box {
    padding: 32px 24px;
  }
}