/* ============================================
   响应式样式
   ============================================ */

/* 平板及以下 */
@media (max-width: 1024px) {
  .hero__inner {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .hero__visual { height: 360px; }

  .hero__title { font-size: 44px; }

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

  .about-grid { grid-template-columns: 1fr; gap: 40px; }
  .about-grid--reverse { direction: ltr; }

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

/* 手机 */
@media (max-width: 768px) {
  :root {
    --container-padding: 16px;
  }
  .section { padding: 56px 0; }
  .section-title { margin-bottom: 40px; }
  .section-title__heading { font-size: 28px; }

  .nav { display: none; }
  .nav.is-open {
    display: flex;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--color-white);
    border-top: 1px solid var(--color-border);
    flex-direction: column;
    align-items: stretch;
    padding: 12px;
    gap: 4px;
    box-shadow: var(--shadow-lg);
  }
  .nav.is-open .nav__link {
    padding: 12px 16px;
    border-radius: var(--radius-md);
  }
  .nav.is-open .lang-switch {
    margin: 8px 0 0;
    align-self: center;
  }

  .menu-toggle { display: flex; }
  .menu-toggle.is-open span { background: transparent; }
  .menu-toggle.is-open span::before { transform: rotate(45deg); top: 0; }
  .menu-toggle.is-open span::after  { transform: rotate(-45deg); top: 0; }

  .hero { min-height: auto; padding: 64px 0 56px; }
  .hero__title { font-size: 34px; }
  .hero__subtitle { font-size: 16px; }
  .hero__stats { grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 36px; padding-top: 28px; }
  .hero__stat-num { font-size: 24px; }
  .hero__visual { display: none; }

  .page-header { padding: 56px 0 48px; }
  .page-header__title { font-size: 28px; }

  .about-content h2 { font-size: 28px; }
  .about-features { grid-template-columns: 1fr; }

  .form, .contact-info { padding: 24px; }
  .form__row { grid-template-columns: 1fr; }

  .footer__top {
    grid-template-columns: 1fr;
    gap: 32px;
    padding-bottom: 32px;
  }

  .cta { padding: 56px 0; }
  .cta h2 { font-size: 24px; }
  .cta p { font-size: 15px; }

  .grid--3 { grid-template-columns: 1fr; }
  .grid--2 { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .hero__title { font-size: 28px; }
  .hero__actions { flex-direction: column; }
  .hero__actions .btn { width: 100%; }
  .partners-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .partner-card { padding: 20px 12px; min-height: 90px; }
  .partner-card__name { font-size: 13px; }
}