/* ========== CSS Variables ========== */
    :root {
      --bg-deep: #f5f8fc;
      --bg-primary: #ffffff;
      --bg-secondary: #eef3fa;
      --bg-card: #ffffff;
      --bg-card-hover: #f4f8fe;
      --text-primary: #1a2333;
      --text-secondary: #5b6b82;
      --text-muted: #8a97a8;
      --accent: #0a7dff;
      --accent2: #0055c8;
      --accent-glow: rgba(10, 125, 255, 0.18);
      --border: rgba(20, 40, 80, 0.08);
      --border-light: rgba(20, 40, 80, 0.14);
      --radius: 12px;
      --radius-sm: 8px;
      --shadow-card: 0 6px 28px rgba(30, 60, 120, 0.08);
      --font: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
      --max-width: 1200px;
      --nav-height: 72px;
    }

    /* ========== Reset ========== */
    *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; font-size: 16px; }
    body {
      font-family: var(--font);
      background: var(--bg-deep);
      color: var(--text-primary);
      line-height: 1.7;
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
    }
    a { color: var(--accent); text-decoration: none; transition: color 0.3s; }
    a:hover { color: var(--accent2); }
    img { max-width: 100%; display: block; }
    ul { list-style: none; }

    /* ========== Canvas Background ========== */
    #particles { position: fixed; inset: 0; z-index: 0; pointer-events: none; }

    /* ========== Grid Overlay ========== */
    .grid-overlay {
      position: fixed; inset: 0; z-index: 1; pointer-events: none;
      background-image:
        linear-gradient(rgba(10, 125, 255, 0.06) 1px, transparent 1px),
        linear-gradient(90deg, rgba(10, 125, 255, 0.06) 1px, transparent 1px);
      background-size: 60px 60px;
      mask-image: radial-gradient(ellipse 60% 60% at 50% 30%, black 30%, transparent 70%);
    }

    /* ========== Navigation ========== */
    .nav {
      position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
      height: var(--nav-height);
      display: flex; align-items: center; justify-content: center;
      gap: 56px; padding: 0 40px;
      transition: background 0.3s, box-shadow 0.3s;
    }
    .nav.scrolled { background: rgba(255, 255, 255, 0.92); backdrop-filter: blur(20px); box-shadow: 0 1px 0 var(--border), 0 4px 16px rgba(30, 60, 120, 0.06); }
    .nav-logo { display: flex; align-items: center; gap: 10px; font-size: 1.42rem; font-weight: 700; color: var(--text-primary); flex-shrink: 0; }
    .nav-logo .logo-icon {
      width: 40px; height: 40px; border-radius: 8px;
      background-image: url('../logo-blue.png'); background-size: contain; background-repeat: no-repeat; background-position: center;
    }
    .nav-links { flex: 0 1 auto; display: flex; gap: 6px; align-items: center; justify-content: flex-start; margin: 0; }
    .nav-links a { color: var(--text-secondary); font-size: 1.03rem; font-weight: 500; transition: color 0.3s; position: relative; }
    .nav-links a:hover, .nav-links a.active { color: var(--accent); }
    /* 蓝色下划线只出现在文字正下方(文字包在 .nav-txt 内):随文字同宽、居中,不含箭头 */
    .nav-links .nav-txt { position: relative; display: inline-block; }
    .nav-links .nav-txt::after {
      content: ''; position: absolute; bottom: -6px; left: 0; right: 0; height: 2px;
      background: var(--accent); border-radius: 2px; transform: scaleX(0);
      transition: transform 0.3s;
    }
    .nav-links a:hover .nav-txt::after, .nav-links a.active .nav-txt::after { transform: scaleX(1); }
    .nav-external {
      flex-shrink: 0; margin-left: 20px;
      background: rgba(10,125,255,0.08); padding: 7px 18px; border-radius: 50px;
      border: 1px solid rgba(10,125,255,0.2); color: var(--accent); font-size: 1.03rem; font-weight: 500;
      transition: background 0.3s, color 0.3s;
    }
    .nav-external:hover { background: rgba(10,125,255,0.15); color: var(--accent2); }
    .nav-toggle { display: none; background: none; border: none; color: var(--text-primary); font-size: 1.6rem; cursor: pointer; padding: 8px; }

    /* ========== Section Common ========== */
    section { position: relative; z-index: 2; padding: 100px 40px; }
    .section-label {
      display: inline-block; font-size: 0.75rem; font-weight: 600; letter-spacing: 3px;
      color: var(--accent); text-transform: uppercase; margin-bottom: 12px;
    }
    .section-title { font-size: 2.4rem; font-weight: 700; margin-bottom: 16px; line-height: 1.3; }
    .section-subtitle { color: var(--text-secondary); font-size: 1.05rem; margin-bottom: 48px; max-width: 600px; }
    .container { max-width: var(--max-width); margin: 0 auto; }

    /* ========== Hero ========== */
    .hero {
      min-height: 100vh; display: flex; align-items: center; justify-content: center;
      text-align: center; padding: 120px 40px 100px; position: relative;
      background:
        radial-gradient(ellipse 80% 60% at 50% 0%, rgba(10, 125, 255, 0.10), transparent 70%),
        radial-gradient(ellipse 60% 40% at 80% 100%, rgba(10, 125, 255, 0.06), transparent 70%);
    }
    .hero-content { max-width: 800px; position: relative; z-index: 2; }
    .hero-badge {
      display: inline-block; padding: 6px 18px; border-radius: 50px;
      border: 1px solid rgba(10, 125, 255, 0.25); font-size: 0.8rem; color: var(--accent);
      margin-bottom: 28px; backdrop-filter: blur(10px); background: rgba(10, 125, 255, 0.08);
    }
    .hero-title { font-size: 3.6rem; font-weight: 800; line-height: 1.2; margin-bottom: 20px; }
    .hero-title .highlight { background: linear-gradient(135deg, var(--accent), var(--accent2)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
    .hero-desc { font-size: 1.15rem; color: var(--text-secondary); margin-bottom: 40px; }
    .hero-btns { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
    .btn {
      display: inline-flex; align-items: center; gap: 8px;
      padding: 14px 32px; border-radius: 50px; font-size: 0.95rem; font-weight: 600;
      transition: all 0.3s; cursor: pointer; border: none; text-decoration: none;
    }
    .btn-primary { background: linear-gradient(135deg, var(--accent), var(--accent2)); color: #fff; box-shadow: 0 4px 20px var(--accent-glow); }
    .btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 30px var(--accent-glow); color: #fff; }
    .btn-outline { background: transparent; border: 1px solid var(--border-light); color: var(--text-primary); }
    .btn-outline:hover { border-color: var(--accent); color: var(--accent); }

    /* ========== About ========== */
    .about { background: var(--bg-primary); }
    .about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
    .about-text p { color: var(--text-secondary); margin-bottom: 16px; }
    .about-stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; margin-top: 32px; }
    .stat-item { text-align: center; padding: 20px 12px; background: var(--bg-card); border-radius: var(--radius-sm); border: 1px solid var(--border); }
    .stat-num { font-size: 2rem; font-weight: 800; color: var(--accent); }
    .stat-label { font-size: 0.8rem; color: var(--text-muted); margin-top: 4px; }

    /* Timeline */
    .timeline { margin-top: 80px; position: relative; }
    .timeline::before {
      content: ''; position: absolute; left: 50%; top: 0; bottom: 0; width: 1px;
      background: linear-gradient(to bottom, transparent, var(--accent), transparent);
    }
    .tl-item { display: flex; align-items: flex-start; margin-bottom: 40px; position: relative; }
    .tl-item:nth-child(odd) { flex-direction: row; text-align: right; }
    .tl-item:nth-child(even) { flex-direction: row-reverse; }
    .tl-year { flex: 1; padding: 0 40px; font-size: 1.5rem; font-weight: 800; color: var(--accent); }
    .tl-dot {
      position: absolute; left: 50%; transform: translateX(-50%);
      width: 12px; height: 12px; border-radius: 50%; background: var(--accent);
      box-shadow: 0 0 12px var(--accent-glow); margin-top: 8px;
    }
    .tl-content { flex: 1; padding: 0 40px; color: var(--text-secondary); }

    /* ========== Services ========== */
    .services-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
    .service-card {
      background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
      padding: 36px 28px; transition: all 0.4s; position: relative; overflow: hidden;
    }
    .service-card:hover { background: var(--bg-card-hover); border-color: var(--border-light); transform: translateY(-6px); box-shadow: var(--shadow-card); }
    .service-card::before {
      content: ''; position: absolute; top: 0; left: 0; right: 0; height: 2px;
      background: linear-gradient(90deg, transparent, var(--accent), transparent);
      opacity: 0; transition: opacity 0.4s;
    }
    .service-card:hover::before { opacity: 1; }
    .service-icon { width: 52px; height: 52px; border-radius: 14px; display: flex; align-items: center; justify-content: center; font-size: 1.5rem; margin-bottom: 20px; background: rgba(10,125,255,0.08); }
    .service-card h3 { font-size: 1.15rem; margin-bottom: 10px; }
    .service-card p { color: var(--text-secondary); font-size: 0.9rem; }

    /* ========== Solutions ========== */
    .solutions-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
    .solution-card {
      background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
      padding: 40px 28px; text-align: center; transition: all 0.4s;
    }
    .solution-card:hover { border-color: var(--accent); box-shadow: 0 8px 40px rgba(10,125,255,0.08); }
    .solution-card .icon-circle {
      width: 64px; height: 64px; border-radius: 50%; margin: 0 auto 20px;
      background: linear-gradient(135deg, rgba(10,125,255,0.1), rgba(0,85,200,0.1));
      border: 1px solid rgba(10,125,255,0.2); display: flex; align-items: center; justify-content: center;
      font-size: 1.6rem;
    }
    .solution-card h3 { font-size: 1.2rem; margin-bottom: 8px; }
    .solution-card .target { color: var(--accent); font-size: 0.85rem; margin-bottom: 12px; }
    .solution-card p { color: var(--text-secondary); font-size: 0.9rem; }

    /* ========== Products (产品中心增强) ========== */
    .prod-group { margin-bottom: 46px; }
    .prod-group:last-child { margin-bottom: 0; }
    .prod-group-head { display: flex; align-items: center; justify-content: center; gap: 10px; margin-bottom: 26px; flex-wrap: wrap; }
    .prod-group-head h3 { font-size: 1.25rem; color: var(--text-primary); }
    .prod-group-head .badge {
      font-size: 0.7rem; color: var(--accent); border: 1px solid rgba(10,125,255,0.28);
      background: rgba(10,125,255,0.06); padding: 3px 12px; border-radius: 50px; font-weight: 500;
    }
    .solution-card { position: relative; }
    .prod-link {
      display: inline-flex; align-items: center; gap: 4px; margin-top: 16px;
      font-size: 0.85rem; color: var(--accent); font-weight: 600;
      border-bottom: 1px solid rgba(10,125,255,0.25); padding-bottom: 2px; transition: all .3s;
    }
    .prod-link:hover { color: var(--accent2); border-color: var(--accent2); }
    .prod-search {
      display: inline-block; margin-top: 16px; font-size: 0.75rem; color: var(--text-secondary);
      border: 1px dashed rgba(20,40,80,0.2); padding: 5px 14px; border-radius: 50px;
      background: var(--bg-secondary);
    }
    .mini-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 420px)); gap: 24px; justify-content: center; }

    /* ========== Cases ========== */
    .cases-filter { display: flex; gap: 12px; margin-bottom: 32px; flex-wrap: wrap; }
    .filter-tag {
      padding: 8px 20px; border-radius: 50px; border: 1px solid var(--border-light);
      background: transparent; color: var(--text-secondary); cursor: pointer;
      font-size: 0.85rem; transition: all 0.3s;
    }
    .filter-tag:hover, .filter-tag.active { background: var(--accent); color: #fff; border-color: var(--accent); }
    .cases-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
    .case-card {
      background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
      overflow: hidden; transition: all 0.4s;
    }
    .case-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-card); }
    .case-img {
      height: 180px; background: linear-gradient(135deg, var(--bg-secondary), #dbe7f7);
      display: flex; align-items: center; justify-content: center;
      font-size: 2.5rem;
    }
    .case-body { padding: 20px; }
    .case-tags { display: flex; gap: 8px; margin-bottom: 10px; }
    .case-tag { font-size: 0.7rem; padding: 3px 10px; border-radius: 50px; background: rgba(10,125,255,0.1); color: var(--accent); }
    .case-body h3 { font-size: 1rem; margin-bottom: 8px; }
    .case-body p { color: var(--text-secondary); font-size: 0.85rem; }

    /* ========== News ========== */
    .news-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
    .news-card {
      background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
      overflow: hidden; transition: all 0.4s;
    }
    .news-card:hover { transform: translateY(-4px); border-color: var(--border-light); }
    .news-img {
      height: 160px; background: linear-gradient(135deg, #e8f0fb, #d9e6fa);
      display: flex; align-items: center; justify-content: center; font-size: 2rem; color: var(--text-muted);
    }
    .news-body { padding: 20px; }
    .news-date { font-size: 0.75rem; color: var(--text-muted); margin-bottom: 8px; }
    .news-body h3 { font-size: 1rem; margin-bottom: 8px; }
    .news-body p { color: var(--text-secondary); font-size: 0.85rem; }

    /* ========== Partners ========== */
    .partners-groups { display: flex; flex-direction: column; gap: 40px; }
    .partner-group-title { font-size: 1rem; color: var(--text-muted); margin-bottom: 16px; padding-bottom: 8px; border-bottom: 1px solid var(--border); }
    .partner-logos { display: flex; flex-wrap: wrap; gap: 28px; align-items: center; }
    .partner-logo {
      padding: 12px 20px; min-width: 100px; border-radius: var(--radius-sm);
      background: rgba(10,125,255,0.04); border: 1px solid var(--border);
      display: flex; align-items: center; justify-content: center;
      font-size: 0.85rem; color: var(--text-muted); transition: all 0.3s;
      text-align: center; white-space: nowrap;
    }
    .partner-logo:hover { border-color: var(--accent); color: var(--accent); }

    /* ========== Support Flow ========== */
    .flow { display: flex; justify-content: space-between; align-items: flex-start; margin-bottom: 64px; position: relative; }
    .flow::after {
      content: ''; position: absolute; top: 24px; left: 60px; right: 60px; height: 1px;
      background: linear-gradient(90deg, var(--accent), var(--accent2), var(--accent));
    }
    .flow-step { text-align: center; position: relative; z-index: 1; flex: 1; }
    .flow-num {
      width: 48px; height: 48px; border-radius: 50%; margin: 0 auto 12px;
      background: var(--bg-secondary); border: 2px solid var(--accent);
      display: flex; align-items: center; justify-content: center;
      font-weight: 700; font-size: 1.1rem; color: var(--accent);
    }
    .flow-step h4 { font-size: 0.95rem; margin-bottom: 4px; }
    .flow-step p { font-size: 0.8rem; color: var(--text-secondary); }

    /* FAQ */
    .faq-list { display: flex; flex-direction: column; gap: 12px; }
    .faq-item { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-sm); overflow: hidden; }
    .faq-q {
      padding: 18px 24px; display: flex; justify-content: space-between; align-items: center;
      cursor: pointer; font-weight: 600; font-size: 0.95rem; transition: background 0.3s;
    }
    .faq-q:hover { background: rgba(10,125,255,0.03); }
    .faq-a { padding: 0 24px 18px; color: var(--text-secondary); font-size: 0.9rem; display: none; }
    .faq-item.open .faq-a { display: block; }
    .faq-q .arrow { transition: transform 0.3s; font-size: 0.7rem; color: var(--text-muted); }
    .faq-item.open .faq-q .arrow { transform: rotate(180deg); }

    /* ========== Careers ========== */
    .careers-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
    .job-card {
      background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
      padding: 28px; transition: all 0.3s;
    }
    .job-card:hover { border-color: var(--accent); }
    .job-header { display: flex; justify-content: space-between; align-items: flex-start; margin-bottom: 12px; }
    .job-header h3 { font-size: 1.1rem; }
    .job-status { font-size: 0.7rem; padding: 4px 12px; border-radius: 50px; background: rgba(10,125,255,0.1); color: var(--accent); }
    .job-card p { color: var(--text-secondary); font-size: 0.9rem; margin-bottom: 4px; }

    /* ========== Contact ========== */
    .contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; }
    .contact-info h3 { font-size: 1.3rem; margin-bottom: 24px; }
    .contact-item { display: flex; gap: 14px; margin-bottom: 20px; align-items: flex-start; }
    .contact-icon {
      width: 40px; height: 40px; border-radius: 10px; background: rgba(10,125,255,0.08);
      display: flex; align-items: center; justify-content: center; font-size: 1rem; flex-shrink: 0;
    }
    .contact-item .label { font-size: 0.8rem; color: var(--text-muted); }
    .contact-item .value { color: var(--text-primary); }
    .contact-form { display: flex; flex-direction: column; gap: 16px; }
    .form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
    .form-input {
      width: 100%; padding: 14px 16px; border-radius: var(--radius-sm);
      background: var(--bg-secondary); border: 1px solid var(--border);
      color: var(--text-primary); font-size: 0.9rem; font-family: var(--font);
      transition: border-color 0.3s;
    }
    .form-input:focus { outline: none; border-color: var(--accent); }
    .form-input::placeholder { color: var(--text-muted); }
    textarea.form-input { resize: vertical; min-height: 120px; }
    .submit-btn {
      padding: 14px 40px; border-radius: 50px; border: none;
      background: linear-gradient(135deg, var(--accent), var(--accent2));
      color: #fff; font-weight: 600; font-size: 0.95rem; cursor: pointer;
      transition: all 0.3s; align-self: flex-start;
    }
    .submit-btn:hover { box-shadow: 0 8px 30px var(--accent-glow); transform: translateY(-2px); }

    /* ========== Footer ========== */
    .footer {
      background: #eef3fa; border-top: 1px solid var(--border);
      padding: 56px 40px 28px; position: relative; z-index: 2;
    }
    .footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; max-width: var(--max-width); margin: 0 auto 32px; }
    .footer-brand p { color: var(--text-secondary); font-size: 0.9rem; margin-top: 12px; }
    .footer-col h4 { font-size: 0.9rem; margin-bottom: 16px; }
    .footer-col a { display: block; color: var(--text-secondary); font-size: 0.85rem; margin-bottom: 8px; transition: color 0.3s; }
    .footer-col a:hover { color: var(--accent); }
    .footer-bottom { max-width: var(--max-width); margin: 0 auto; padding-top: 24px; border-top: 1px solid var(--border); display: flex; justify-content: space-between; color: var(--text-muted); font-size: 0.8rem; }

    /* ========== Scroll-to-top ========== */
    .scroll-top {
      position: fixed; bottom: 32px; right: 32px; z-index: 999;
      width: 44px; height: 44px; border-radius: 50%;
      background: #ffffff; border: 1px solid var(--border-light);
      color: var(--accent); display: flex; align-items: center; justify-content: center;
      cursor: pointer; font-size: 1.2rem; transition: all 0.3s; opacity: 0; visibility: hidden;
      box-shadow: 0 6px 20px rgba(30, 60, 120, 0.12);
    }
    .scroll-top.show { opacity: 1; visibility: visible; }
    .scroll-top:hover { border-color: var(--accent); color: var(--accent); }

    /* ========== Responsive ========== */
    @media (max-width: 1024px) {
      .hero-title { font-size: 2.8rem; }
      .about-grid { grid-template-columns: 1fr; gap: 40px; }
      .about-stats { grid-template-columns: repeat(2, 1fr); }
      .services-grid, .solutions-grid, .cases-grid, .news-grid { grid-template-columns: repeat(2, 1fr); }
      .contact-grid { grid-template-columns: 1fr; gap: 40px; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .flow::after { left: 30px; right: 30px; }
    }
    @media (max-width: 768px) {
      :root { --nav-height: 60px; }
      section { padding: 70px 20px; }
      .section-title { font-size: 1.8rem; }
      .nav { padding: 0 20px; justify-content: space-between; gap: 12px; }
      .nav-links { display: none; position: fixed; top: 60px; left: 0; right: 0; background: rgba(255,255,255,0.97); backdrop-filter: blur(20px); flex-direction: column; padding: 24px; gap: 20px; border-bottom: 1px solid var(--border); }
      .nav-links.open { display: flex; }
      .nav-toggle { display: block; }
      .hero-title { font-size: 2.2rem; }
      .hero-desc { font-size: 1rem; }
      .hero { padding: 100px 20px 70px; }
      .about-stats { grid-template-columns: repeat(2, 1fr); }
      .services-grid, .solutions-grid, .cases-grid, .news-grid { grid-template-columns: 1fr; }
      .mini-grid { grid-template-columns: 1fr; max-width: 440px; margin: 0 auto; }
      .careers-grid { grid-template-columns: 1fr; }
      .form-row { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; gap: 24px; }
      .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }
      .flow { flex-direction: column; align-items: center; gap: 24px; }
      .flow::after { display: none; }
      .partner-logos { justify-content: center; }
      .timeline::before { left: 20px; }
      .tl-item, .tl-item:nth-child(even) { flex-direction: column; text-align: left; padding-left: 44px; }
      .tl-year { padding: 0 0 4px 0; font-size: 1.2rem; }
      .tl-content { padding: 0; }
      .tl-dot { left: 20px; }
    }
    @media (max-width: 480px) {
      .hero-title { font-size: 1.8rem; }
      section { padding: 56px 16px; }
      .btn { padding: 12px 24px; font-size: 0.85rem; }
      .section-title { font-size: 1.5rem; }
    }
  
    /* ================================================================
       MULTI-PAGE & DROPDOWN NAV  (点鹤科技多页版 — 微盟式二级下拉)
       ================================================================ */

    /* ---- Dropdown navigation ---- */
    .nav-links { gap: 6px; }
    .nav-item { position: relative; }
    .nav-item > .nav-a {
      display: inline-flex; align-items: center; gap: 6px;
      color: var(--text-secondary); font-size: 1.05rem; font-weight: 500;
      padding: 8px 14px; border-radius: 8px; transition: color 0.3s; position: relative;
    }
    .nav-item > .nav-a:hover, .nav-item > .nav-a.active { color: var(--accent); background: rgba(10,125,255,0.06); }
    /* 下划线统一由顶部 .nav-txt::after 渲染(与文字同宽、居中),这里禁用旧的整条宽版本 */
    .nav-item > .nav-a::after { display: none; content: none; }
    .nav-item > .nav-a:hover::after, .nav-item > .nav-a.active::after { display: none; }
    .nav-item > .nav-a .caret { color: var(--text-muted); transition: transform 0.3s, color 0.3s; margin-top: 1px; }
    .nav-item > .nav-a:hover .caret, .nav-item > .nav-a.active .caret { color: var(--accent); }
    .nav-item:hover > .nav-a .caret { transform: rotate(180deg); }

    .drop {
      position: absolute; top: calc(100% + 10px); left: 0;
      background: #fff; border: 1px solid var(--border); border-radius: 14px;
      box-shadow: 0 18px 50px rgba(30,60,120,0.14);
      padding: 20px; min-width: 260px; z-index: 1100;
      opacity: 0; visibility: hidden; transform: translateY(8px);
      transition: opacity 0.25s ease, transform 0.25s ease, visibility 0.25s;
    }
    .drop::before {
      content: ''; position: absolute; top: -12px; left: 0; right: 0; height: 14px; /* hover bridge */
    }
    .nav-item:hover > .drop, .nav-item:focus-within > .drop { opacity: 1; visibility: visible; transform: translateY(0); }

    /* mega menu (products / services) */
    .drop.mega { width: 620px; max-width: calc(100vw - 48px); }
    .mega-head { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; padding-bottom: 12px; margin-bottom: 12px; border-bottom: 1px solid var(--border); }
    .mega-head b { font-size: 1rem; }
    .mega-head a { font-size: 0.78rem; color: var(--accent); font-weight: 600; }
    .drop-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 6px; }
    .drop-item {
      display: flex; align-items: flex-start; gap: 12px; padding: 12px 12px;
      border-radius: 10px; transition: background 0.25s; color: var(--text-primary);
    }
    .drop-item:hover { background: var(--bg-card-hover); color: var(--text-primary); }
    .di-ico {
      width: 40px; height: 40px; border-radius: 10px; flex-shrink: 0;
      background: rgba(10,125,255,0.08); display: flex; align-items: center; justify-content: center;
    }
    .di-main b { display: block; font-size: 0.9rem; line-height: 1.3; }
    .di-main i { display: block; font-style: normal; font-size: 0.75rem; color: var(--text-muted); margin-top: 2px; line-height: 1.4; }
    .drop-item .go { margin-left: auto; font-size: 0.85rem; color: var(--accent); opacity: 0; transition: opacity 0.2s, transform 0.2s; align-self: center; }
    .drop-item:hover .go { opacity: 1; transform: translateX(2px); }
    .drop-more { display: block; text-align: center; margin-top: 12px; padding-top: 12px; border-top: 1px solid var(--border); font-size: 0.85rem; color: var(--accent); font-weight: 600; }
    .drop-more:hover { color: var(--accent2); }

    /* simple column drop */
    .drop-list a {
      display: flex; align-items: center; justify-content: space-between; gap: 8px;
      padding: 10px 12px; border-radius: 10px; color: var(--text-secondary);
      font-size: 0.9rem; transition: all 0.25s; text-decoration: none;
    }
    .drop-list a:hover { background: var(--bg-card-hover); color: var(--accent); }
    .drop-list a .go { font-size: 0.8rem; opacity: 0; transition: opacity 0.2s; }
    .drop-list a:hover .go { opacity: 1; }
    .drop-note { padding: 10px 12px 2px; font-size: 0.72rem; color: var(--text-muted); }

    /* neutralise legacy link underline inside dropdowns */
    .drop a::after { display: none; content: none; }

    /* ---- Inner page scaffolding ---- */
    body.subpage { padding-top: var(--nav-height); }
    .page-banner {
      background:
        radial-gradient(ellipse 70% 100% at 20% 0%, rgba(10,125,255,0.10), transparent 60%),
        linear-gradient(180deg, #f2f7fd 0%, var(--bg-deep) 100%);
      padding: 64px 40px 56px; text-align: center; position: relative;
    }
    .page-banner .pb-tag { display:inline-block; font-size:0.72rem; font-weight:600; letter-spacing:3px; color:var(--accent); text-transform:uppercase; margin-bottom:14px; }
    .page-banner h1 { font-size: 2.3rem; font-weight: 800; margin-bottom: 12px; line-height: 1.3; }
    .page-banner p { color: var(--text-secondary); font-size: 1rem; max-width: 640px; margin: 0 auto 18px; }
    .crumb { display:flex; justify-content:center; gap:8px; font-size:0.8rem; color:var(--text-muted); flex-wrap:wrap; }
    .crumb a { color: var(--text-muted); }
    .crumb a:hover { color: var(--accent); }
    .crumb .sep { color: var(--text-muted); opacity: 0.6; }

    .sec { padding: 72px 40px; }
    .sec.alt { background: var(--bg-secondary); }
    .sec-head { text-align: center; max-width: 720px; margin: 0 auto 44px; }
    .sec-head h2 { font-size: 1.9rem; font-weight: 700; margin-bottom: 12px; }
    .sec-head p { color: var(--text-secondary); }
    .sec-foot { text-align: center; margin-top: 40px; }

    /* generic content prose for detail pages */
    .prose { max-width: 860px; margin: 0 auto; }
    .prose h2 { font-size: 1.5rem; margin: 40px 0 16px; padding-left: 14px; border-left: 4px solid var(--accent); line-height: 1.35; }
    .prose h3 { font-size: 1.15rem; margin: 28px 0 10px; }
    .prose p { color: var(--text-secondary); margin-bottom: 16px; }
    .prose ul, .prose ol { color: var(--text-secondary); margin: 0 0 16px 0; padding-left: 4px; }
    .prose li { padding-left: 20px; position: relative; margin-bottom: 8px; }
    .prose ul li::before { content: ''; position:absolute; left:2px; top:10px; width:6px; height:6px; border-radius:50%; background:var(--accent); }
    .prose .note { background: rgba(10,125,255,0.05); border: 1px solid rgba(10,125,255,0.14); border-radius: 10px; padding: 16px 18px; font-size: 0.9rem; color: var(--text-secondary); margin: 18px 0; }
    .prose img { border-radius: 12px; margin: 20px 0; }

    /* feature grid on inner pages */
    .feat-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
    .feat-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 30px 26px; transition: all .3s; }
    .feat-card:hover { transform: translateY(-4px); border-color: var(--border-light); box-shadow: var(--shadow-card); }
    .feat-card .fc-ico { width: 48px; height: 48px; border-radius: 12px; background: rgba(10,125,255,0.08); display:flex; align-items:center; justify-content:center; margin-bottom: 16px; }
    .feat-card h3 { font-size: 1.05rem; margin-bottom: 8px; }
    .feat-card p { font-size: 0.88rem; color: var(--text-secondary); }

    /* two column split (icon + content rows) for list pages */
    .row-list { display: flex; flex-direction: column; gap: 18px; }
    .row-card { display: flex; gap: 22px; align-items: flex-start; background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 28px; transition: all .3s; }
    .row-card:hover { border-color: rgba(10,125,255,0.35); box-shadow: var(--shadow-card); transform: translateY(-2px); }
    .row-card .rc-ico { width: 56px; height: 56px; border-radius: 14px; flex-shrink: 0; background: rgba(10,125,255,0.08); display:flex; align-items:center; justify-content:center; }
    .row-card h3 { font-size: 1.1rem; margin-bottom: 6px; }
    .row-card .rc-sub { font-size: 0.8rem; color: var(--accent); margin-bottom: 8px; font-weight: 600; }
    .row-card p { color: var(--text-secondary); font-size: 0.9rem; margin-bottom: 12px; }
    .row-card .arrow-link { font-size: 0.85rem; color: var(--accent); font-weight: 600; display: inline-flex; gap: 4px; align-items: center; }
    .row-card .arrow-link:hover { color: var(--accent2); }

    /* article / news detail */
    .art-head { max-width: 860px; margin: 0 auto 30px; text-align: center; }
    .art-head h1 { font-size: 1.9rem; line-height: 1.4; margin-bottom: 14px; }
    .art-meta { display: flex; justify-content: center; gap: 18px; color: var(--text-muted); font-size: 0.8rem; flex-wrap: wrap; }

    /* spec table */
    .spec-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: var(--radius); background: var(--bg-card); }
    .spec-table { width: 100%; border-collapse: collapse; font-size: 0.9rem; min-width: 560px; }
    .spec-table th, .spec-table td { text-align: left; padding: 14px 18px; border-bottom: 1px solid var(--border); }
    .spec-table tr:last-child td { border-bottom: none; }
    .spec-table th { background: var(--bg-secondary); width: 220px; font-weight: 600; color: var(--text-primary); }
    .spec-table td { color: var(--text-secondary); }

    /* steps (reuse flow in simple vertical) */
    .steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
    .step-card { text-align: center; padding: 26px 18px; background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); }
    .step-card .s-num { width: 40px; height: 40px; margin: 0 auto 12px; border-radius: 50%; background: rgba(10,125,255,0.1); color: var(--accent); display: flex; align-items: center; justify-content: center; font-weight: 700; }
    .step-card h4 { font-size: 0.95rem; margin-bottom: 6px; }
    .step-card p { font-size: 0.8rem; color: var(--text-secondary); }

    /* CTA band */
    .cta-band { background: linear-gradient(135deg, #eef4fd, #e3edfc); border-radius: 18px; padding: 52px 48px; text-align: center; margin: 0 40px; border: 1px solid rgba(10,125,255,0.15); }
    .cta-band h2 { font-size: 1.6rem; margin-bottom: 10px; }
    .cta-band p { color: var(--text-secondary); margin-bottom: 24px; }
    .cta-band .btn-group { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
    .cta-wrap { max-width: var(--max-width); margin: 0 auto; }

    /* news-detail template empty/loading state */
    .notfound { text-align: center; padding: 90px 20px; }
    .notfound .nf-code { font-size: 4rem; font-weight: 800; color: var(--border-light); line-height: 1; }
    .notfound p { color: var(--text-muted); margin: 10px 0 22px; }

    /* responsive additions for dropdown & inner pages */
    @media (max-width: 1024px) {
      .feat-grid { grid-template-columns: repeat(2, 1fr); }
      .steps { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 768px) {
      .nav-item { width: 100%; }
      .nav-item > .nav-a { width: 100%; justify-content: space-between; padding: 10px 6px; }
      .drop, .drop.right { position: static; transform: none; opacity: 1; visibility: visible; display: none; box-shadow: none; border: none; background: transparent; padding: 4px 0 4px 14px; min-width: 0; width: 100% !important; }
      .nav-item.open > .drop { display: block; }
      .drop-grid { grid-template-columns: 1fr; }
      .mega-head { margin-bottom: 6px; }
      .page-banner { padding: 48px 20px 40px; }
      .page-banner h1 { font-size: 1.6rem; }
      .sec { padding: 56px 20px; }
      .cta-band { margin: 0 20px; padding: 36px 24px; }
      .feat-grid { grid-template-columns: 1fr; }
      .row-card { flex-direction: column; gap: 14px; padding: 22px; }
      .prose { padding: 0 4px; }
      .art-head h1 { font-size: 1.5rem; }
    }
    @media (max-width: 480px) {
      .sec { padding: 44px 16px; }
      .steps { grid-template-columns: 1fr; }
      .drop-grid { grid-template-columns: 1fr; }
    }

    /* ---- Logo+菜单整体居中：较窄桌面收紧 gap 避免溢出 ---- */
    @media (max-width: 1240px) {
      .nav { padding: 0 28px; gap: 34px; }
      .nav-links { gap: 2px; }
      .nav-item > .nav-a { padding: 8px 11px; font-size: 1rem; }
    }
    @media (max-width: 1040px) {
      .nav { padding: 0 20px; gap: 18px; }
      .nav-logo { font-size: 1.3rem; }
      .nav-logo .logo-icon { width: 36px; height: 36px; }
      .nav-links { gap: 2px; }
      .nav-item > .nav-a { padding: 7px 8px; font-size: 0.95rem; gap: 4px; }
      .nav-external { padding: 5px 12px; font-size: 0.9rem; margin-left: 12px; }
    }
    @media (max-width: 768px) {
      .nav { justify-content: space-between; gap: 12px; }
      .nav-links { margin: 0; }
      .nav-external { display: none; }
    }