* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: "Helvetica Neue", Arial, sans-serif;
  line-height: 1.6;
  color: #0f172a;
  background: #f8fafc;
}

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

.hero {
  background: linear-gradient(135deg, #111827 0%, #1e293b 60%, #0f172a 100%);
  color: #f8fafc;
  padding: 32px 6vw 80px;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 48px;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  letter-spacing: 0.5px;
}

.logo-mark {
  width: 32px;
  height: 32px;
  object-fit: contain;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 18px;
}

.nav-link {
  font-size: 0.95rem;
  opacity: 0.8;
}

.nav-link:hover {
  opacity: 1;
}

.hero-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 40px;
  align-items: center;
}

.hero-text h1 {
  font-size: clamp(2rem, 4vw, 3.5rem);
  line-height: 1.2;
  margin: 12px 0 20px;
}

.highlight {
  color: #38bdf8;
}

.eyebrow {
  font-size: 0.9rem;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: #94a3b8;
}

.subhead {
  font-size: 1.05rem;
  color: #e2e8f0;
  margin-bottom: 28px;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 32px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 22px;
  border-radius: 999px;
  font-weight: 600;
  transition: all 0.2s ease;
  border: 1px solid transparent;
}

.btn-primary {
  background: #38bdf8;
  color: #0f172a;
}

.btn-primary:hover {
  background: #0ea5e9;
}

.btn-secondary {
  background: #1e293b;
  color: #e2e8f0;
  border-color: #334155;
}

.btn-secondary:hover {
  border-color: #38bdf8;
  color: #38bdf8;
}

.btn-ghost {
  color: #e2e8f0;
  border: 1px solid #475569;
}

.btn-ghost:hover {
  border-color: #38bdf8;
  color: #38bdf8;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 16px;
}

.stat {
  background: rgba(15, 23, 42, 0.5);
  padding: 16px;
  border-radius: 16px;
}

.stat-number {
  display: block;
  font-size: 1.3rem;
  font-weight: 700;
}

.stat-label {
  font-size: 0.85rem;
  color: #cbd5f5;
}

.hero-card {
  background: rgba(248, 250, 252, 0.08);
  padding: 28px;
  border-radius: 24px;
  border: 1px solid rgba(148, 163, 184, 0.3);
  backdrop-filter: blur(10px);
}

.hero-image {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 16px;
  object-fit: contain;
}

.card-header {
  font-weight: 600;
  margin-bottom: 16px;
}

.card-list {
  list-style: none;
  display: grid;
  gap: 12px;
  color: #e2e8f0;
}

.section {
  padding: 72px 6vw;
  background: #f8fafc;
}

.section.alt {
  background: #e2e8f0;
}

.section-title {
  max-width: 720px;
  margin-bottom: 40px;
}

.section-title h2 {
  font-size: clamp(1.6rem, 3vw, 2.5rem);
  margin-bottom: 12px;
}

.grid-3,
.grid-4 {
  display: grid;
  gap: 24px;
}

.grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.grid-4 {
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

.card {
  background: #ffffff;
  border-radius: 20px;
  padding: 24px;
  box-shadow: 0 20px 40px rgba(15, 23, 42, 0.08);
}

.card h3 {
  margin-bottom: 12px;
  font-size: 1.15rem;
}

.highlight-card {
  border: 1px solid rgba(56, 189, 248, 0.3);
}

.mode-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.mode-title {
  font-size: 1.2rem;
  font-weight: 700;
}

.mode-tag {
  font-size: 0.85rem;
  color: #0ea5e9;
  font-weight: 600;
}

.timeline {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
}

.timeline-item {
  background: #ffffff;
  border-radius: 16px;
  padding: 20px;
  border-left: 4px solid #38bdf8;
  box-shadow: 0 12px 30px rgba(15, 23, 42, 0.08);
}

.timeline-title {
  font-weight: 700;
  margin-bottom: 8px;
}

.cta {
  background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
  color: #f8fafc;
}

.cta-box {
  max-width: 900px;
  margin: 0 auto;
  text-align: center;
  display: grid;
  gap: 18px;
}

.wechat {
  font-size: 1.05rem;
  color: #e2e8f0;
}

.wechat-id {
  font-weight: 700;
  color: #38bdf8;
}

.cta-actions {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 16px;
}

.footer {
  background: #0f172a;
  color: #94a3b8;
  padding: 32px 6vw 24px;
}

.footer-content {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 16px;
}

.footer-links {
  display: flex;
  gap: 16px;
}

.footer-links a {
  color: #cbd5f5;
  font-size: 0.9rem;
}

.footer-bottom {
  font-size: 0.8rem;
  color: #64748b;
}

@media (max-width: 768px) {
  .nav {
    flex-direction: column;
    align-items: flex-start;
  }

  .nav-actions {
    display: none;
  }

  .hero {
    padding: 24px 5vw 60px;
  }

  .section {
    padding: 56px 5vw;
  }
}

@media (max-width: 520px) {
  .hero-cta,
  .cta-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .btn {
    width: 100%;
  }
}