/* ===== 91网 响应式样式 ===== */

/* 大屏 (1200px以上) - 默认样式已覆盖 */

/* 中屏 (992px - 1199px) */
@media (max-width: 1199px) {
  .hero-title { font-size: 36px; }
  .features-grid { grid-template-columns: repeat(3, 1fr); gap: 20px; }
  .video-grid { grid-template-columns: repeat(3, 1fr); }
  .contact-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1.5fr 1fr 1fr 1.5fr; gap: 28px; }
  .about-stats { grid-template-columns: repeat(2, 1fr); }
}

/* 平板 (768px - 991px) */
@media (max-width: 991px) {
  .section { padding: 56px 0; }
  .section-title { font-size: 26px; }
  .hero-inner { grid-template-columns: 1fr; gap: 32px; }
  .hero-title { font-size: 32px; }
  .hero-image { order: -1; }
  .hero-image img { max-height: 320px; object-fit: cover; }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .scenarios-grid { grid-template-columns: repeat(2, 1fr); }
  .video-grid { grid-template-columns: repeat(2, 1fr); }
  .reviews-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 28px; }
  .content-grid { grid-template-columns: 1fr; }
  .sidebar { position: static; }
  .contact-page-grid { grid-template-columns: 1fr; }
  .download-cards { grid-template-columns: repeat(2, 1fr); }
  .help-grid { grid-template-columns: 1fr; }
  .about-stats { grid-template-columns: repeat(2, 1fr); }
}

/* 手机 (767px以下) */
@media (max-width: 767px) {
  .container { padding: 0 16px; }
  .section { padding: 40px 0; }
  .section-title { font-size: 22px; }
  .section-subtitle { font-size: 14px; }

  /* 头部 */
  .header-inner { height: 56px; }
  .logo-icon { font-size: 18px; padding: 3px 8px; }
  .logo-text { font-size: 18px; }
  .main-nav {
    display: none;
    position: fixed;
    top: 56px;
    left: 0;
    right: 0;
    background: var(--bg-white);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-md);
    z-index: 999;
    padding: 16px;
    max-height: calc(100vh - 56px);
    overflow-y: auto;
  }
  .main-nav.open { display: block; }
  .main-nav ul { flex-direction: column; gap: 2px; }
  .main-nav ul li a { padding: 10px 14px; font-size: 15px; }
  .mobile-menu-btn { display: flex; }

  /* 搜索框 */
  .search-form { max-width: 100%; }
  .search-btn span { display: none; }
  .search-tips { display: none; }

  /* 首屏 */
  .hero-banner { padding: 40px 0 32px; }
  .hero-inner { gap: 24px; }
  .hero-badge { font-size: 12px; padding: 5px 12px; }
  .hero-title { font-size: 26px; }
  .hero-subtitle { font-size: 14px; }
  .hero-stats { gap: 16px; padding: 14px; flex-wrap: wrap; justify-content: center; }
  .stat-item strong { font-size: 18px; }
  .hero-actions { flex-direction: column; gap: 10px; }
  .hero-actions .btn { width: 100%; justify-content: center; }
  .hero-image img { max-height: 220px; }

  /* 功能区 */
  .features-grid { grid-template-columns: 1fr; }
  .feature-card img { height: 160px; }

  /* 场景 */
  .scenarios-grid { grid-template-columns: 1fr; }

  /* 视频卡片 */
  .video-grid { grid-template-columns: 1fr; }

  /* 教程步骤 */
  .step-item { flex-direction: column; gap: 12px; }

  /* 更新日志 */
  .changelog-item { flex-direction: column; gap: 8px; }

  /* 评价 */
  .reviews-grid { grid-template-columns: 1fr; }

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

  /* 页脚 */
  .footer-grid { grid-template-columns: 1fr; gap: 24px; }
  .footer-bottom-inner { flex-direction: column; align-items: flex-start; gap: 8px; }

  /* 内页 */
  .page-hero { padding: 32px 0 28px; }
  .page-hero h1 { font-size: 24px; }
  .content-grid { grid-template-columns: 1fr; }
  .download-cards { grid-template-columns: 1fr; }
  .about-stats { grid-template-columns: repeat(2, 1fr); }
  .contact-page-grid { grid-template-columns: 1fr; }

  /* 视频弹窗 */
  .video-modal { padding: 16px; }
}

/* 超小屏 (480px以下) */
@media (max-width: 480px) {
  .hero-title { font-size: 22px; }
  .hero-stats { flex-direction: column; gap: 12px; }
  .about-stats { grid-template-columns: 1fr; }
}