* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: #111827;
  background: #f8fafc;
  line-height: 1.7;
}

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

.container {
  width: min(1100px, calc(100% - 32px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(248, 250, 252, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid #e5e7eb;
}

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

.brand a {
  font-size: 1.2rem;
  font-weight: 700;
  color: #0f172a;
}

.nav-links {
  display: flex;
  gap: 20px;
  font-size: 0.95rem;
  color: #475569;
}

.nav-links a:hover {
  color: #111827;
}

.hero {
  padding: 96px 0 72px;
  background:
    radial-gradient(circle at top left, rgba(99, 102, 241, 0.12), transparent 30%),
    radial-gradient(circle at bottom right, rgba(14, 165, 233, 0.10), transparent 28%),
    #f8fafc;
}

.hero-content {
  max-width: 760px;
}

.hero-tag,
.section-tag {
  display: inline-block;
  margin-bottom: 12px;
  font-size: 0.9rem;
  font-weight: 600;
  color: #4f46e5;
  background: rgba(79, 70, 229, 0.08);
  padding: 6px 12px;
  border-radius: 999px;
}

.hero h1 {
  margin: 0 0 18px;
  font-size: clamp(2.3rem, 5vw, 4rem);
  line-height: 1.15;
  color: #0f172a;
}

.hero-desc {
  max-width: 720px;
  font-size: 1.08rem;
  color: #475569;
  margin-bottom: 28px;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 22px;
  border-radius: 12px;
  font-weight: 600;
  transition: 0.2s ease;
}

.btn-primary {
  background: #111827;
  color: #ffffff;
}

.btn-primary:hover {
  opacity: 0.92;
}

.btn-secondary {
  border: 1px solid #cbd5e1;
  color: #111827;
  background: #ffffff;
}

.btn-secondary:hover {
  background: #f1f5f9;
}

.section {
  padding: 72px 0;
}

.section-alt {
  background: #ffffff;
}

.section-header {
  max-width: 760px;
  margin-bottom: 32px;
}

.section-header h2 {
  margin: 0 0 12px;
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  line-height: 1.2;
  color: #0f172a;
}

.section-desc {
  margin: 0;
  color: #475569;
}

.grid {
  display: grid;
  gap: 20px;
}

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

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

.card {
  background: #ffffff;
  border: 1px solid #e2e8f0;
  border-radius: 18px;
  padding: 24px;
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.04);
}

.card h3 {
  margin-top: 0;
  margin-bottom: 10px;
  color: #0f172a;
  font-size: 1.1rem;
}

.card p,
.card li {
  color: #475569;
}

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

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

.timeline-item {
  padding: 22px 24px;
  border-left: 4px solid #4f46e5;
  background: #f8fafc;
  border-radius: 12px;
}

.timeline-item h3 {
  margin: 0 0 8px;
  color: #0f172a;
}

.timeline-item p {
  margin: 0;
  color: #475569;
}

.cta-section {
  padding-top: 24px;
  padding-bottom: 88px;
}

.cta-box {
  background: linear-gradient(135deg, #0f172a, #1e293b);
  color: #ffffff;
  border-radius: 24px;
  padding: 40px 32px;
}

.cta-box h2 {
  margin-top: 0;
  margin-bottom: 12px;
}

.cta-box p {
  color: rgba(255, 255, 255, 0.82);
  max-width: 720px;
}

.cta-box .section-tag {
  color: #c7d2fe;
  background: rgba(255, 255, 255, 0.12);
}

.cta-box .btn-primary {
  background: #ffffff;
  color: #111827;
}

.cta-box .btn-secondary {
  border-color: rgba(255, 255, 255, 0.25);
  color: #ffffff;
  background: transparent;
}

.site-footer {
  border-top: 1px solid #e5e7eb;
  background: #ffffff;
  padding: 28px 0;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  align-items: center;
}

.footer-content h3 {
  margin: 0 0 6px;
}

.footer-content p {
  margin: 0;
  color: #64748b;
}

.footer-links {
  display: flex;
  gap: 18px;
  color: #475569;
}

@media (max-width: 900px) {
  .grid-2,
  .grid-3 {
    grid-template-columns: 1fr;
  }

  .nav {
    flex-direction: column;
    justify-content: center;
    gap: 12px;
    padding: 14px 0;
  }

  .footer-content {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 640px) {
  .hero {
    padding-top: 72px;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .btn {
    width: 100%;
  }

  .nav-links {
    flex-wrap: wrap;
    gap: 12px;
  }
}