:root {
      --color-primary: #DD0C2E;
      --color-primary-dark: #b80a26;
      --color-text: #333333;
      --color-text-muted: #666666;
      --color-bg: #ffffff;
      --color-soft: #f5f5f5;
      --color-line: #dddddd;
      --max: 1200px;
      --sidebar: 280px;
      --header-offset: 138px; /* 白头+红导航总高，锚点与侧栏共用 */
      color: var(--color-text);
      background: var(--color-bg);
      font-family: "Microsoft YaHei", "PingFang SC", "Segoe UI", Arial, sans-serif;
    }
    * { box-sizing: border-box; }
    html { scroll-behavior: auto; }
    body { margin: 0; overflow-x: hidden; background: var(--color-bg); color: var(--color-text); font-size: 15px; line-height: 1.7; }
    a { color: inherit; text-decoration: none; }
    img { max-width: 100%; height: auto; display: block; }
    ul { margin: 0; padding: 0; list-style: none; }
    .site { min-height: 100vh; background: #fff; display: flex; flex-direction: column; }
    .wrap { width: min(100% - 32px, var(--max)); margin: 0 auto; }

    /* 白头+红导航整体吸顶，锚点滚动时品牌区仍可见 */
    .site-header {
      position: sticky; top: 0; z-index: 30;
      background: #fff;
    }
    .brand-bar {
      background: #fff;
      border-bottom: 1px solid var(--color-line);
    }
    .brand-bar-inner {
      display: flex; align-items: center; justify-content: space-between; gap: 20px;
      min-height: 90px; padding: 14px 0;
    }
    .brand-left strong {
      display: block; font-size: clamp(22px, 2.4vw, 30px); font-weight: 800; color: #222; line-height: 1.25;
    }
    .brand-left span {
      display: block; margin-top: 4px; color: var(--color-text-muted); font-size: 13px;
    }
    .brand-phone {
      display: inline-flex; align-items: center; gap: 10px;
      color: var(--color-primary); font-size: clamp(24px, 2.6vw, 34px); font-weight: 800; letter-spacing: .5px;
      white-space: nowrap;
    }
    .brand-phone svg { width: 28px; height: 28px; flex-shrink: 0; }

    /* 红色通栏导航 */
    .nav-bar {
      background: var(--color-primary);
    }
    .nav-bar-inner { display: flex; flex-wrap: nowrap; gap: 0; overflow-x: auto; -webkit-overflow-scrolling: touch; scrollbar-width: none; }
    .nav-bar-inner::-webkit-scrollbar { display: none; }
    .nav-bar a {
      display: inline-flex; align-items: center; justify-content: center;
      min-height: 48px; padding: 0 18px;
      color: #fff; font-size: 15px; font-weight: 700; white-space: nowrap; flex-shrink: 0;
      transition: background .15s ease;
    }
    .nav-bar a:hover,
    .nav-bar a.active { background: rgba(0, 0, 0, .14); }

    /* 主体：左栏 + 右栏 */
    .page-main {
      display: grid;
      grid-template-columns: var(--sidebar) minmax(0, 1fr);
      gap: 20px;
      padding: 20px 0 40px;
      align-items: start;
    }
    .sidebar { position: sticky; top: calc(var(--header-offset) + 12px); display: grid; gap: 16px; }
    .side-box {
      border: 1px solid var(--color-line);
      background: #fff;
    }
    .side-box-title {
      padding: 12px 14px;
      background: var(--color-soft);
      border-bottom: 1px solid var(--color-line);
      color: #222; font-size: 15px; font-weight: 800;
    }
    .side-contact { padding: 12px 14px 16px; }
    .side-contact li {
      display: flex; gap: 6px; padding: 8px 0;
      border-bottom: 1px dashed #eee; font-size: 14px; color: var(--color-text);
    }
    .side-contact li:last-child { border-bottom: 0; }
    .side-contact span { color: var(--color-text-muted); flex-shrink: 0; }
    .side-contact a { color: var(--color-primary); font-weight: 700; }
    .side-media { padding: 10px; }
    .side-media img {
      width: 100%;
      height: auto;
      aspect-ratio: 4 / 3;
      object-fit: cover;
      display: block;
    }
    .side-media > .img-protect { aspect-ratio: 4 / 3; overflow: hidden; }
    .side-media > .img-protect > img { width: 100%; height: 100%; object-fit: cover; aspect-ratio: auto; }

    .content { min-width: 0; display: grid; gap: 20px; }
    .panel {
      border: 1px solid var(--color-line);
      background: #fff;
      scroll-margin-top: var(--header-offset);
    }
    .panel-head {
      padding: 14px 18px 10px;
      border-bottom: 1px solid #eee;
    }
    .panel-title {
      display: inline-flex; align-items: center; gap: 10px;
      padding-bottom: 8px;
      border-bottom: 3px solid var(--color-primary);
    }
    .panel-title .title-icon {
      flex-shrink: 0;
      width: 28px; height: 28px;
      display: grid; place-items: center;
      color: var(--color-primary);
    }
    .panel-title .title-icon svg { width: 22px; height: 22px; display: block; }
    .panel-head h2 {
      margin: 0;
      font-size: 20px;
      font-weight: 800;
      color: #222;
      line-height: 1.3;
    }
    .panel-body { padding: 18px; }
    .body-text { margin: 0; color: var(--color-text); line-height: 1.9; font-size: 15px; }
    .lead { margin: 0 0 14px; color: var(--color-text-muted); line-height: 1.8; }

    /* 服务方案 */
    .series + .series { margin-top: 28px; padding-top: 24px; border-top: 1px solid #eee; }
    .series h3 {
      margin: 0 0 8px; font-size: 17px; font-weight: 800; color: #222;
      padding-left: 10px; border-left: 3px solid var(--color-primary);
    }
    .series-desc { margin: 0 0 16px; color: var(--color-text-muted); line-height: 1.8; font-size: 14px; }
    .product-grid {
      display: grid;
      grid-template-columns: repeat(4, minmax(0, 1fr));
      gap: 14px;
    }
    .product-card {
      border: 1px solid var(--color-line);
      background: #fff;
      transition: border-color .15s ease, box-shadow .15s ease;
    }
    .product-card:hover {
      border-color: var(--color-primary);
      box-shadow: 0 4px 14px rgba(221, 12, 46, .08);
    }
    .product-card img { width: 100%; height: auto; }
    .product-card strong {
      display: block; padding: 10px 12px; font-size: 14px; font-weight: 700; color: #333; text-align: center;
    }

    /* 核心优势：三列上图下文 */
    .adv-list {
      display: grid;
      grid-template-columns: repeat(3, minmax(0, 1fr));
      gap: 16px;
    }
    .adv-item {
      border: 1px solid var(--color-line);
      background: #fff;
      overflow: hidden;
      transition: border-color .15s ease, box-shadow .15s ease;
    }
    .adv-item:hover {
      border-color: var(--color-primary);
      box-shadow: 0 4px 14px rgba(221, 12, 46, .08);
    }
    .adv-item img { width: 100%; height: auto; display: block; }
    .adv-body {
      display: flex; gap: 10px; align-items: flex-start;
      padding: 12px 14px 14px;
    }
    .adv-index {
      flex-shrink: 0;
      width: 28px; height: 28px;
      display: grid; place-items: center;
      background: var(--color-primary); color: #fff;
      font-size: 12px; font-weight: 800;
    }
    .adv-item strong { display: block; font-size: 14px; font-weight: 700; color: #222; line-height: 1.55; }

    /* 案例 */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(3, minmax(0, 1fr));
      gap: 16px;
    }
    .case-card {
      border: 1px solid var(--color-line);
      background: #fff;
      overflow: hidden;
    }
    .case-card img { width: 100%; height: auto; }
    .case-body { padding: 14px; }
    .case-body em {
      display: inline-block; margin-bottom: 6px;
      color: var(--color-primary); font-style: normal; font-size: 12px; font-weight: 700;
    }
    .case-body strong { display: block; margin-bottom: 8px; font-size: 16px; color: #222; }
    .case-body p { margin: 0; color: var(--color-text-muted); font-size: 13px; line-height: 1.75; }

    /* 联系 */
    .contact-panel {
      display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap;
      padding: 22px 18px;
      background: linear-gradient(90deg, #fff5f6, #fff);
      border: 1px solid #f3c5cd;
    }
    .contact-panel h2 { margin: 0 0 6px; font-size: 20px; color: #222; }
    .contact-panel p { margin: 0; color: var(--color-text-muted); }
    .contact-btn {
      display: inline-flex; align-items: center; gap: 8px;
      min-height: 44px; padding: 0 20px;
      background: var(--color-primary); color: #fff; font-weight: 800;
    }
    .contact-btn:hover { background: var(--color-primary-dark); }
    .contact-btn svg { width: 18px; height: 18px; }

    /* 页脚 */
    .footer {
      margin-top: auto; background: #2a2a2a; color: #ccc; padding: 28px 0 18px;
    }
    .footer-grid {
      display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 24px;
      padding-bottom: 18px; border-bottom: 1px solid rgba(255,255,255,.1);
    }
    .footer strong { display: block; color: #fff; font-size: 16px; margin-bottom: 8px; }
    .footer h3 { margin: 0 0 10px; color: #fff; font-size: 15px; }
    .footer p { margin: 0; font-size: 13px; line-height: 1.8; color: #aaa; }
    .footer-nav { display: grid; gap: 6px; }
    .footer-nav a { color: #bbb; font-size: 13px; }
    .footer-nav a:hover { color: #fff; }
    .footer-nav a.active { color: #fff; }
    .footer a[href^="tel"] {
      display: inline-flex; align-items: center; gap: 8px; color: #fff; font-weight: 700;
    }
    .footer-loc { display: block; margin-top: 8px; font-size: 13px; color: #999; }
    .footer-bottom {
      padding-top: 14px; text-align: center; font-size: 12px; color: #888;
    }

    .mobile-call {
      display: none;
      position: fixed; right: 14px; bottom: 70px; z-index: 40;
      min-height: 44px; padding: 0 14px;
      background: var(--color-primary); color: #fff; font-weight: 800;
      box-shadow: 0 8px 20px rgba(221, 12, 46, .35);
      align-items: center; gap: 8px;
    }
    .call-icon { flex-shrink: 0; width: 18px; height: 18px; display: block; }

    .viewport-disclaimer {
      position: fixed; left: 0; right: 0; bottom: 0; z-index: 50;
      padding: 8px 16px; background: rgba(40, 40, 40, .92); color: #ddd;
      font-size: 12px; line-height: 1.5; text-align: center;
    }
    body.has-viewport-disclaimer { padding-bottom: 52px; }

    @media (max-width: 960px) {
      .page-main { grid-template-columns: 1fr; }
      .sidebar { position: static; grid-template-columns: 1fr 1fr; }
      .product-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
      .case-grid { grid-template-columns: 1fr; }
      .adv-list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
      .footer-grid { grid-template-columns: 1fr; }
    }
    @media (max-width: 720px) {
      .brand-bar-inner { flex-direction: column; align-items: flex-start; min-height: auto; }
      .nav-bar a { padding: 0 14px; font-size: 13px; min-height: 42px; }
      .sidebar { grid-template-columns: 1fr; }
      .product-grid { grid-template-columns: 1fr 1fr; }
      .adv-list { grid-template-columns: 1fr; }
      .mobile-call { display: inline-flex; }
      .brand-phone { font-size: 22px; }
    }
  
    /* 新闻 / 联系占位 */
    .news-grid {
      display: grid;
      grid-template-columns: repeat(3, minmax(0, 1fr));
      gap: 14px;
    }
    .news-card {
      display: grid; gap: 8px; padding: 14px;
      border: 1px solid var(--color-line); background: #fff; color: inherit;
      transition: border-color .15s ease, box-shadow .15s ease;
    }
    .news-card:hover {
      border-color: rgba(221,12,46,.35);
      box-shadow: 0 8px 18px rgba(0,0,0,.06);
    }
    .news-card time { color: var(--color-text-muted); font-size: 12px; font-weight: 700; }
    .news-card strong { color: #222; font-size: 15px; line-height: 1.45; font-weight: 800; }
    .news-card p { margin: 0; color: var(--color-text-muted); font-size: 13px; line-height: 1.7; }
    .news-list { display: grid; gap: 12px; }
    .news-list-item {
      display: grid; gap: 6px; padding: 14px; border: 1px solid var(--color-line); background: #fff; color: inherit;
    }
    .news-list-item:hover { border-color: rgba(221,12,46,.35); }
    .news-list-item strong { color: #222; font-size: 16px; font-weight: 800; }
    .news-list-item time, .news-list-item p { margin: 0; color: var(--color-text-muted); font-size: 13px; line-height: 1.7; }
    .news-article { display: grid; gap: 14px; max-width: 860px; }
    .news-article time { color: var(--color-text-muted); font-size: 13px; font-weight: 700; }
    .news-article h1 { margin: 0; color: #222; font-size: clamp(22px, 3vw, 32px); line-height: 1.35; font-weight: 900; }
    .news-article .body-text { color: var(--color-text-muted); font-size: 14px; line-height: 1.9; }
    .news-more, .news-back { color: var(--color-primary); font-weight: 800; }
    .news-more-wrap { margin-top: 16px; }
    .contact-card {
      display: grid; gap: 12px; max-width: 520px; padding: 18px 16px;
      border: 1px solid var(--color-line); background: #fafafa;
    }
    .contact-card dl { margin: 0; display: grid; gap: 12px; }
    .contact-card dt { color: var(--color-text-muted); font-size: 12px; font-weight: 800; }
    .contact-card dd { margin: 4px 0 0; color: #222; font-size: 16px; font-weight: 800; }
    .contact-card a { color: var(--color-primary); }
    .brand-left a { color: inherit; }
    @media (max-width: 900px) {
      .news-grid { grid-template-columns: 1fr; }
    }