/* ===== 响应式媒体查询 ===== */

/* 平板（≤1024px） */
@media (max-width: 1024px) {
  :root {
    --space-section: 72px;
  }

  .container {
    padding: 0 28px;
  }

  .about-grid {
    gap: 48px;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 36px;
  }

  .contact-wrapper {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .partners-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .stat-item:nth-child(2) {
    border-right: none;
  }

  .stat-item:nth-child(1),
  .stat-item:nth-child(2) {
    border-bottom: 1px solid rgba(255,255,255,0.15);
    padding-bottom: 32px;
  }

  .stat-item:nth-child(3),
  .stat-item:nth-child(4) {
    padding-top: 32px;
  }
}

/* 移动端（≤768px） */
@media (max-width: 768px) {
  :root {
    --space-section: 56px;
    --text-6xl: 2.25rem;
    --text-5xl: 2rem;
    --text-4xl: 1.75rem;
    --text-3xl: 1.5rem;
  }

  .container {
    padding: 0 20px;
  }

  /* 导航 */
  .nav-menu,
  .nav-actions {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  /* Hero */
  .hero-title {
    font-size: 2rem;
  }

  .hero-subtitle {
    font-size: var(--text-base);
  }

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

  .hero-actions .btn {
    width: 220px;
    justify-content: center;
  }

  /* About */
  .about-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .about-image-badge {
    right: 12px;
  }

  .about-values {
    grid-template-columns: repeat(3, 1fr);
  }

  /* Solutions */
  .sol-tab-btn {
    padding: 12px 20px;
    font-size: var(--text-sm);
  }

  .solution-pane {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  /* Cases */
  .cases-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  /* Why */
  .why-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  /* Partners */
  .partners-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  /* Contact */
  .contact-wrapper {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .contact-form-box {
    padding: 28px 20px;
  }

  .form-row {
    grid-template-columns: 1fr;
    gap: 0;
  }

  /* Footer */
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 8px;
    text-align: center;
  }

  /* Page Banner */
  .page-banner {
    padding: 120px 0 60px;
  }

  .page-banner h1 {
    font-size: var(--text-4xl);
  }

  /* Section header */
  .section-header {
    margin-bottom: 40px;
  }

  .section-title {
    font-size: var(--text-3xl);
  }
}

/* 小屏（≤480px） */
@media (max-width: 480px) {
  .about-values {
    grid-template-columns: 1fr;
  }

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

  .stat-item {
    border-right: none;
    border-bottom: 1px solid rgba(255,255,255,0.15);
    padding-bottom: 24px;
    margin-bottom: 8px;
  }

  .stat-item:last-child {
    border-bottom: none;
  }

  .partners-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-legal {
    flex-direction: column;
    gap: 8px;
  }
}