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

:root {
  --primary: #667eea;
  --primary-dark: #764ba2;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  min-height: 100vh;
  color: #1a1a2e;
}

.hero {
  text-align: center;
  padding: 4rem 1.5rem 2rem;
}

.domain-name {
  font-size: 3.5rem;
  font-weight: 700;
  color: white;
  letter-spacing: -1px;
  text-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  margin-bottom: 0.75rem;
}

.sale-badge {
  display: inline-block;
  background: rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: 50px;
  padding: 0.6rem 2rem;
  margin-bottom: 1rem;
}

.sale-badge span {
  color: white;
  font-size: 1.1rem;
  font-weight: 500;
}

.sale-badge .zh {
  display: block;
  font-size: 0.95rem;
  opacity: 0.9;
  margin-top: 0.2rem;
}

.tagline {
  color: rgba(255, 255, 255, 0.85);
  font-size: 1.15rem;
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.6;
}

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 1.5rem 3rem;
}

.section {
  margin-bottom: 2.5rem;
}

.section-title {
  color: rgba(255, 255, 255, 0.9);
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 1.25rem;
  padding-left: 0.75rem;
  border-left: 3px solid rgba(255, 255, 255, 0.5);
}

/* Highlights */
.highlights {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  justify-content: center;
  margin-bottom: 2.5rem;
}

.highlight-chip {
  background: rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: 50px;
  padding: 0.5rem 1.25rem;
  color: white;
  font-size: 0.95rem;
  font-weight: 500;
}

/* Use case cards */
.cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
}

.card {
  background: rgba(255, 255, 255, 0.95);
  border-radius: 16px;
  padding: 1.5rem;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--primary-dark));
  opacity: 0;
  transition: opacity 0.3s;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.15);
}

.card:hover::before {
  opacity: 1;
}

.card-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 0.75rem;
  font-size: 1.3rem;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: white;
}

.card h3 {
  font-size: 1.05rem;
  font-weight: 600;
  color: #1a1a2e;
  margin-bottom: 0.4rem;
}

.card p {
  font-size: 0.9rem;
  color: #64748b;
  line-height: 1.5;
}

/* CTA */
.cta {
  text-align: center;
  padding: 2rem 0;
}

.cta-button {
  display: inline-block;
  background: white;
  color: var(--primary-dark);
  font-size: 1.15rem;
  font-weight: 600;
  padding: 1rem 2.5rem;
  border-radius: 50px;
  text-decoration: none;
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
  transition: all 0.3s;
}

.cta-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 35px rgba(0, 0, 0, 0.2);
}

.cta-sub {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.85rem;
  margin-top: 0.75rem;
}

/* Footer */
.footer {
  text-align: center;
  padding: 1.5rem;
  color: rgba(255, 255, 255, 0.5);
  font-size: 0.8rem;
}

/* Responsive */
@media (max-width: 640px) {
  .hero {
    padding: 2.5rem 1rem 1.5rem;
  }

  .domain-name {
    font-size: 2.2rem;
  }

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

  .card {
    padding: 1.25rem;
  }

  .cta-button {
    padding: 0.85rem 2rem;
    font-size: 1rem;
  }
}

/* Dark mode */
@media (prefers-color-scheme: dark) {
  .card {
    background: rgba(30, 30, 46, 0.95);
  }

  .card h3 {
    color: #e2e8f0;
  }

  .card p {
    color: #94a3b8;
  }

  .cta-button {
    background: rgba(255, 255, 255, 0.95);
  }
}