/* ============================================================
   唐鼎信息官网 · 响应式
   必须最后加载，以覆盖前面各层的规则
   ============================================================ */

@media (max-width: 1180px) {
  .header-cta { display: none; }
  .main-nav { gap: 0; }
  .main-nav a { padding: 10px 12px; font-size: 14.5px; }
  .hero-body { padding-right: 40px; }
}

@media (max-width: 1024px) {
  :root { --pad: 26px; }

  .cols-4, .cols-5, .stat-row, .ai-map, .industry-row { grid-template-columns: repeat(2, 1fr); }
  .steps-5, .steps-6 { grid-template-columns: repeat(3, 1fr); }
  .arch-row { grid-template-columns: 160px 1fr; }
  .split-row { gap: 36px; }
  .case-detail { gap: 34px; }

  /* 首屏改为上下堆叠，图片收窄。
     注意渐变下缘不能收得太早：原来在 60% 就压到 0.5、100% 全黑，
     图片本身只有 320px，扣掉后有效画面所剩无几，机械臂和厂房顶全丢。 */
  .hero { grid-template-columns: 1fr; min-height: 0; }
  .hero-body {
    max-width: none; margin: 0; padding: 140px var(--pad) 56px;
    order: 2;
  }
  .hero-media { order: 1; height: 340px; }
  .hero-media img { object-position: 62% center; }
  .hero-media::after {
    background: linear-gradient(180deg,
      rgba(13, 14, 26, 0.28) 0%, rgba(13, 14, 26, 0.10) 40%,
      rgba(13, 14, 26, 0.46) 84%, var(--ink-900) 100%);
  }
}

@media (max-width: 768px) {
  :root { --pad: 20px; }

  body { font-size: 15.5px; }
  .section { padding: 64px 0; }
  .section-tight { padding: 48px 0; }

  .cols-2, .cols-3, .cols-4, .cols-5, .stat-row, .stat-row.cols-3,
  .steps-5, .steps-6, .ai-map, .industry-row,
  .tri, .compare, .eco-grid, .arch-row,
  .split-row, .case-detail, .case-cols, .case-fact,
  .contact-grid, .dark-cols, .form-row { grid-template-columns: 1fr; }

  .split-row.reverse .split-media,
  .case-detail.reverse .case-media { order: 0; }

  .def-list > div, .matrix-item { grid-template-columns: 1fr; gap: 6px; }
  .contact-list li { grid-template-columns: 1fr; gap: 4px; }
  .wechat-contact { width: 160px; }
  .logo-item { min-height: 110px; padding: 22px 28px; }

  .page-hero { padding: 132px 0 56px; }
  .sec-head { margin-bottom: 36px; }
  .sec-head h2 { font-size: 24px; }

  .hero-body { padding: 120px var(--pad) 44px; }
  .hero-media { height: 260px; }
  .hero-facts { gap: 24px; margin-top: 36px; padding-top: 24px; }
  .hero-facts div b { font-size: 24px; }
  .hero-actions .btn { flex: 1 1 auto; }
  /* 404 页三个按钮：flex-grow 会让它们宽窄不一（实测 152/184/350），改为等宽竖排 */
  .hero-actions-stack { flex-direction: column; align-items: stretch; }
  .hero-actions-stack .btn { flex: none; width: 100%; }

  .biz-item { grid-template-columns: 1fr; gap: 8px; padding: 26px 22px; }
  .biz-arrow { display: none; }

  .dark-panel { padding: 30px 24px; }
  .stance-bar { padding: 20px 22px; font-size: 15px; }
  .contact-form-wrap { padding: 28px 22px; }

  /* ---------- 表格改为堆叠卡片 ----------
     三列表格在 390px 下横向溢出 210px，而「国产软件方向」正是这张表要回答的
     结论列 —— 实测第三列文字起点 x=377、可见区到 370，一个像素都没露，
     且全站没有任何「可左右滑动」的提示。改成每行一张卡，把表头作为字段名。 */
  .table-wrap { overflow-x: visible; box-shadow: none; background: transparent; }
  table.data { min-width: 0; background: transparent; }
  table.data thead {
    position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%);
  }
  table.data tbody tr {
    display: block; background: #fff; border-radius: var(--r-sm);
    box-shadow: var(--sh-1); padding: 14px 0; margin-bottom: 12px;
  }
  table.data tbody tr:hover { background: #fff; }
  table.data td {
    display: grid; grid-template-columns: 96px 1fr; gap: 12px;
    padding: 7px 18px; border: none; white-space: normal;
  }
  table.data td:first-child { white-space: normal; }
  table.data td::before {
    content: attr(data-label);
    color: var(--text-2); font-size: 13px; font-weight: 600;
  }
  /* 第一列是行标题，单独强调 */
  table.data td:first-child { font-size: 16px; margin-bottom: 4px; }
  table.data td:first-child::before { display: none; }
  .cta-inner { flex-direction: column; align-items: flex-start; }
  /* 流程条横排在窄屏会把「→」留在行尾、末步单独掉到下一行，顺序感断掉。
     改为竖排 + 箭头向下。 */
  .flow-bar {
    flex-direction: column; gap: 4px; padding: 22px 20px;
  }
  .flow-bar i { transform: rotate(90deg); line-height: 1; }
  .footer-nav { gap: 14px 20px; }

  /* ---------- 移动端导航 ---------- */
  .main-nav {
    position: fixed; inset: 78px 0 auto 0;
    flex-direction: column; gap: 0; margin: 0;
    background: rgba(13, 14, 26, 0.98);
    backdrop-filter: blur(18px);
    padding: 14px var(--pad) 30px;
    transform: translateY(-14px); opacity: 0; pointer-events: none;
    transition: opacity 0.32s var(--ease), transform 0.32s var(--ease);
    max-height: calc(100vh - 78px); overflow-y: auto;
  }
  .main-nav.open { transform: none; opacity: 1; pointer-events: auto; }
  .main-nav a {
    color: rgba(255, 255, 255, 0.86) !important;
    padding: 15px 4px; font-size: 16.5px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 0;
  }
  .main-nav a::after { display: none; }
  .main-nav a.active { color: #ff5468 !important; }

  .nav-toggle { display: block; }
  .site-header.scrolled .main-nav { top: 66px; }
}

@media (max-width: 400px) {
  .hero-media { height: 220px; }
  .hero h1 { font-size: 27px; }
}

/* 尊重系统的减弱动效偏好 */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .reveal { opacity: 1; transform: none; }
}