/* 首页专属样式 */
.hero {
  position: relative;
  min-height: 42vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 4rem 2rem;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background: 
    radial-gradient(ellipse 80% 50% at 50% 0%, rgba(14, 165, 233, 0.25) 0%, transparent 55%),
    radial-gradient(ellipse 60% 40% at 80% 60%, rgba(34, 211, 238, 0.15) 0%, transparent 50%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  text-align: center;
  max-width: 720px;
}

.hero-title {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.hero-title .gradient-text {
  background: linear-gradient(135deg, #0ea5e9, #0284c7);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-title .sub {
  display: block;
  font-size: 0.45em;
  font-weight: 500;
  color: var(--text-secondary);
  -webkit-text-fill-color: initial;
}

.hero-desc {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-top: 1rem;
}

.section {
  max-width: 960px;
  margin: 0 auto 4rem;
  padding: 0 1.5rem;
}

.section-title {
  font-size: 1.35rem;
  color: var(--text-primary);
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.title-icon {
  color: var(--accent-blue);
  font-size: 0.85em;
}

.origin-card p {
  margin-bottom: 0.75rem;
}

.origin-card .mt {
  margin-top: 1rem;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.25rem;
}

.feature-card {
  transition: transform 0.2s, box-shadow 0.2s;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(14, 165, 233, 0.18);
}

.feature-icon {
  font-size: 2rem;
  margin-bottom: 0.75rem;
}

.feature-card h3 {
  font-size: 1.1rem;
  color: var(--accent-deep);
  margin-bottom: 0.5rem;
}

.feature-card p {
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.stats-card .stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  margin-bottom: 1.5rem;
}

.stat-item {
  text-align: center;
}

.stat-value {
  display: block;
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--accent-deep);
}

.stat-label {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.stats-note {
  font-size: 0.9rem;
  color: var(--text-secondary);
  border-top: 1px solid rgba(14, 165, 233, 0.2);
  padding-top: 1rem;
}

.cta-section {
  margin-bottom: 3rem;
}

.cta-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
}

.cta-card {
  display: block;
  text-decoration: none;
  color: inherit;
  transition: transform 0.2s, box-shadow 0.2s;
}

.cta-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(14, 165, 233, 0.2);
}

.cta-num {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent-blue);
  opacity: 0.9;
}

.cta-card h3 {
  font-size: 1.2rem;
  color: var(--text-primary);
  margin: 0.5rem 0 0.5rem;
}

.cta-card p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

.cta-link {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--accent-deep);
}

.footer {
  text-align: center;
  padding: 2rem 1rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

@media (max-width: 640px) {
  .stats-grid {
    grid-template-columns: 1fr !important;
    gap: 1rem !important;
  }
}