* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'SF Pro Text', 'Segoe UI', 'Microsoft YaHei', sans-serif;
  color: #111827;
  background: #0f172a;
  line-height: 1.6;
}

.hero {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #0f172a 100%);
  color: #f9fafb;
  padding: 80px 16px 56px;
}

.hero-inner {
  max-width: 960px;
  margin: 0 auto;
  text-align: center;
}

.hero h1 {
  font-size: clamp(28px, 5vw, 40px);
  margin: 0 0 16px;
  font-weight: 600;
}

.subtitle {
  font-size: 18px;
  margin: 0;
  color: #e5e7eb;
  font-weight: 400;
}

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 48px 16px 64px;
}

.section {
  margin-bottom: 40px;
  background: rgba(15,23,42,0.7);
  border-radius: 16px;
  padding: 32px 24px;
  border: 1px solid rgba(148,163,184,0.3);
  backdrop-filter: blur(12px);
}

.section h2 {
  margin-top: 0;
  margin-bottom: 20px;
  font-size: 24px;
  color: #e5e7eb;
  font-weight: 600;
}

.section h3 {
  margin-top: 0;
  margin-bottom: 12px;
  font-size: 18px;
  color: #e5e7eb;
  font-weight: 600;
}

.section p {
  color: #d1d5db;
  line-height: 1.8;
  font-size: 15px;
  margin: 0 0 16px;
}

.section ul {
  padding-left: 24px;
  margin: 16px 0;
  color: #d1d5db;
}

.section li {
  margin-bottom: 12px;
  line-height: 1.8;
  font-size: 15px;
}

.section li strong {
  color: #e5e7eb;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
}

.card {
  border-radius: 12px;
  border: 1px solid rgba(148,163,184,0.4);
  padding: 24px 20px;
  background: linear-gradient(135deg, rgba(102,126,234,0.15), rgba(15,23,42,0.9));
  transition: transform 0.2s, box-shadow 0.2s;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(102,126,234,0.2);
}

a {
  color: #818cf8;
  text-decoration: none;
  transition: color 0.2s;
}

a:hover {
  color: #a5b4fc;
  text-decoration: underline;
}

.footer {
  border-top: 1px solid rgba(148,163,184,0.3);
  padding: 32px 16px;
  text-align: center;
  color: #6b7280;
  font-size: 14px;
  background: rgba(15,23,42,0.5);
}

.footer p {
  margin: 8px 0;
  color: #9ca3af;
}

.footer .icp {
  margin-top: 12px;
}

.footer .icp a {
  color: #9ca3af;
  font-size: 13px;
}

@media (prefers-color-scheme: light) {
  body {
    background: #f9fafb;
    color: #111827;
  }

  .hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #e0e7ff 100%);
    color: #0f172a;
  }

  .subtitle {
    color: #374151;
  }

  .section {
    background: rgba(255,255,255,0.9);
    border-color: rgba(209,213,219,0.8);
  }

  .section h2, .section h3 {
    color: #111827;
  }

  .section p, .section li {
    color: #374151;
  }

  .section li strong {
    color: #111827;
  }

  .card {
    background: linear-gradient(135deg, rgba(102,126,234,0.08), #ffffff);
    border-color: rgba(209,213,219,0.9);
  }

  .footer {
    background: rgba(249,250,251,0.8);
    border-color: rgba(209,213,219,0.8);
  }

  .footer p {
    color: #6b7280;
  }

  .footer .icp a {
    color: #6b7280;
  }
}

@media (max-width: 768px) {
  .hero {
    padding: 60px 16px 40px;
  }

  .container {
    padding: 32px 16px 48px;
  }

  .section {
    padding: 24px 18px;
  }

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