/* responsive.css - 断点策略 */
@media (max-width: 1200px) {
  .nav-menu {
    gap: var(--space-sm);
  }
}

@media (max-width: 992px) {
  .site-header {
    padding: 0 1.25rem;
  }

  .nav-menu {
    position: absolute;
    top: 100%;
    right: 1.25rem;
    flex-direction: column;
    background: rgba(255, 255, 255, 0.95);
    border-radius: var(--radius-lg);
    padding: var(--space-md);
    width: min(280px, 80vw);
    transform: translateY(-10px);
    opacity: 0;
    pointer-events: none;
    box-shadow: var(--shadow-strong);
  }

  .nav-menu.open {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
  }

  .menu-toggle {
    display: inline-flex;
  }

  .hero {
    min-height: 75vh;
  }

  .section-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .masonry {
    column-count: 2;
  }
}

@media (max-width: 640px) {
  .hero {
    text-align: left;
  }

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

  .data-dash {
    flex-direction: column;
  }

  .section-title::before {
    width: 30px;
  }

  .masonry {
    column-count: 1;
  }

  .timeline {
    border-left: none;
    padding-left: 0;
  }

  .timeline-item::before {
    position: relative;
    left: 0;
    display: inline-block;
    margin-bottom: var(--space-xs);
  }
}