/* roulang page: index */
:root {
      --primary: #0052D9;
      --primary-hover: #003cab;
      --primary-light: #EBF2FF;
      --accent: #00A870;
      --accent-hover: #00875a;
      --accent-light: #E8F8F2;
      --dark: #0F172A;
      --dark-card: #1E293B;
      --bg-light: #F8FAFC;
      --bg-white: #FFFFFF;
      --text-main: #0F172A;
      --text-body: #334155;
      --text-muted: #64748B;
      --border: #E2E8F0;
      --radius-sm: 6px;
      --radius-md: 12px;
      --radius-lg: 16px;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
      --shadow-md: 0 4px 12px rgba(15,23,42,0.08);
      --shadow-lg: 0 12px 30px rgba(15,23,42,0.12);
      --transition: all 0.3s ease;
    }
    * { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; }
    body {
      font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-light);
      color: var(--text-body);
      line-height: 1.65;
      font-size: 15px;
      -webkit-font-smoothing: antialiased;
    }
    a { color: inherit; text-decoration: none; transition: var(--transition); }
    img { max-width: 100%; height: auto; display: block; }
    .container { max-width: 1280px; margin: 0 auto; padding: 0 20px; }
    
    /* 顶部通栏 */
    .topbar { background: var(--dark); color: #94A3B8; font-size: 13px; padding: 8px 0; border-bottom: 1px solid #334155; }
    .topbar-content { display: flex; justify-content: space-between; align-items: center; }
    .topbar-info span { margin-right: 20px; }

    /* 导航栏 */
    header.sticky-header {
      position: sticky; top: 0; z-index: 1000;
      background: rgba(255, 255, 255, 0.96);
      backdrop-filter: blur(10px);
      box-shadow: var(--shadow-sm);
      border-bottom: 1px solid var(--border);
    }
    .nav-container { display: flex; justify-content: space-between; align-items: center; height: 72px; }
    .logo-box { display: flex; align-items: center; gap: 10px; }
    .logo-icon { width: 36px; height: 36px; background: var(--primary); border-radius: 8px; display: flex; align-items: center; justify-content: center; color: #fff; font-weight: 700; font-size: 18px; }
    .logo-text { font-size: 20px; font-weight: 700; color: var(--text-main); letter-spacing: -0.5px; }
    .nav-menu { display: flex; list-style: none; gap: 28px; align-items: center; }
    .nav-link { font-weight: 500; color: var(--text-body); font-size: 15px; position: relative; }
    .nav-link:hover, .nav-link.active { color: var(--primary); }
    .nav-btn {
      background: var(--primary); color: #fff; padding: 9px 20px; border-radius: var(--radius-sm);
      font-weight: 600; font-size: 14px; transition: var(--transition); display: inline-block;
    }
    .nav-btn:hover { background: var(--primary-hover); transform: translateY(-1px); }
    .mobile-toggle { display: none; background: none; border: none; font-size: 24px; cursor: pointer; color: var(--text-main); }

    /* 通用板块与排版 */
    section { padding: 80px 0; position: relative; }
    .section-bg-white { background: var(--bg-white); }
    .section-bg-light { background: var(--bg-light); }
    .section-bg-dark { background: var(--dark); color: #F1F5F9; }
    .section-header { text-align: center; max-width: 800px; margin: 0 auto 50px; }
    .section-tag {
      display: inline-block; padding: 4px 14px; border-radius: 20px; font-size: 13px; font-weight: 600;
      background: var(--primary-light); color: var(--primary); margin-bottom: 12px;
    }
    .section-bg-dark .section-tag { background: rgba(0, 168, 112, 0.15); color: var(--accent); }
    .section-title { font-size: 32px; font-weight: 700; color: var(--text-main); line-height: 1.3; margin-bottom: 16px; }
    .section-bg-dark .section-title { color: #FFFFFF; }
    .section-desc { font-size: 16px; color: var(--text-muted); line-height: 1.7; }
    .section-bg-dark .section-desc { color: #94A3B8; }

    /* 按钮组 */
    .btn-group { display: flex; gap: 16px; align-items: center; }
    .btn-primary { background: var(--primary); color: #fff; padding: 12px 28px; border-radius: var(--radius-sm); font-weight: 600; }
    .btn-primary:hover { background: var(--primary-hover); box-shadow: 0 4px 14px rgba(0,82,217,0.3); }
    .btn-accent { background: var(--accent); color: #fff; padding: 12px 28px; border-radius: var(--radius-sm); font-weight: 600; }
    .btn-accent:hover { background: var(--accent-hover); box-shadow: 0 4px 14px rgba(0,168,112,0.3); }
    .btn-outline { border: 1px solid var(--border); color: var(--text-main); padding: 12px 28px; border-radius: var(--radius-sm); font-weight: 600; background: #fff; }
    .btn-outline:hover { background: var(--bg-light); border-color: #cbd5e1; }

    /* 1. Hero 工业参数首屏 */
    .hero-section {
      background: linear-gradient(135deg, rgba(15,23,42,0.92) 0%, rgba(15,23,42,0.85) 100%), url('/assets/images/2caf27f5653ff2dc.webp') center/cover no-repeat;
      color: #fff; padding: 90px 0 70px;
    }
    .hero-grid { display: grid; grid-template-columns: 1.2fr 0.8fr; gap: 40px; align-items: center; }
    .hero-title { font-size: 42px; font-weight: 800; line-height: 1.25; margin-bottom: 20px; color: #FFFFFF; }
    .hero-title span { color: #38bdf8; }
    .hero-p { font-size: 16px; color: #cbd5e1; margin-bottom: 30px; line-height: 1.7; }
    .hero-params-bar {
      display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; background: rgba(255,255,255,0.06);
      border: 1px solid rgba(255,255,255,0.12); padding: 18px; border-radius: var(--radius-md); backdrop-filter: blur(8px); margin-top: 30px;
    }
    .param-item strong { display: block; font-size: 22px; color: #38bdf8; font-weight: 700; }
    .param-item span { font-size: 13px; color: #94A3B8; }
    .hero-card-box {
      background: rgba(30, 41, 59, 0.85); border: 1px solid rgba(255,255,255,0.15); border-radius: var(--radius-lg);
      padding: 30px; box-shadow: var(--shadow-lg); backdrop-filter: blur(12px);
    }
    .hero-card-box h3 { font-size: 20px; color: #fff; margin-bottom: 16px; border-bottom: 1px solid rgba(255,255,255,0.1); padding-bottom: 12px; }
    .hero-list { list-style: none; margin-bottom: 24px; }
    .hero-list li { font-size: 14px; color: #cbd5e1; margin-bottom: 10px; display: flex; align-items: center; gap: 8px; }
    .hero-list li::before { content: "✓"; color: var(--accent); font-weight: bold; }

    /* 2. 方案体系概述 */
    .overview-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 50px; align-items: center; }
    .overview-img-wrap { border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow-md); border: 1px solid var(--border); }
    .tech-specs { margin-top: 24px; display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
    .tech-spec-item { background: var(--bg-light); border-left: 3px solid var(--primary); padding: 12px 16px; border-radius: 0 var(--radius-sm) var(--radius-sm) 0; }
    .tech-spec-item h4 { font-size: 14px; color: var(--text-main); margin-bottom: 4px; }
    .tech-spec-item p { font-size: 13px; color: var(--text-muted); margin: 0; }

    /* 3. 六大核心能力矩阵 */
    .grid-3x2 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
    .feature-card {
      background: #fff; border: 1px solid var(--border); border-radius: var(--radius-md); padding: 30px 24px;
      transition: var(--transition); position: relative; overflow: hidden;
    }
    .feature-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-lg); border-color: var(--primary); }
    .feature-icon-badge {
      width: 48px; height: 48px; border-radius: 10px; background: var(--primary-light); color: var(--primary);
      display: flex; align-items: center; justify-content: center; font-size: 20px; font-weight: bold; margin-bottom: 18px;
    }
    .feature-card h3 { font-size: 18px; color: var(--text-main); margin-bottom: 10px; }
    .feature-card p { font-size: 14px; color: var(--text-muted); line-height: 1.6; }

    /* 4. 旗舰硬件与软硬一体产品 */
    .product-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
    .product-card {
      background: #fff; border: 1px solid var(--border); border-radius: var(--radius-lg); overflow: hidden;
      display: flex; flex-direction: column; transition: var(--transition);
    }
    .product-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: var(--primary); }
    .product-img-box { position: relative; height: 220px; background: #e2e8f0; }
    .product-img-box img { width: 100%; height: 100%; object-fit: cover; }
    .product-badge { position: absolute; top: 14px; left: 14px; background: var(--dark); color: #fff; font-size: 12px; padding: 4px 10px; border-radius: 4px; font-weight: 500; }
    .product-info { padding: 24px; flex: 1; display: flex; flex-direction: column; }
    .product-info h3 { font-size: 19px; color: var(--text-main); margin-bottom: 8px; }
    .product-info p { font-size: 14px; color: var(--text-muted); margin-bottom: 16px; flex: 1; }
    .product-tags { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 20px; }
    .product-tag-pill { font-size: 12px; background: var(--bg-light); color: #475569; padding: 3px 10px; border-radius: 4px; border: 1px solid var(--border); }

    /* 5. 沉浸式深色理念区 */
    .concept-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: center; }
    .concept-card-list { display: grid; gap: 20px; }
    .concept-box { background: var(--dark-card); border: 1px solid #334155; padding: 24px; border-radius: var(--radius-md); transition: var(--transition); }
    .concept-box:hover { border-color: var(--accent); }
    .concept-box h3 { color: #38bdf8; font-size: 17px; margin-bottom: 8px; display: flex; align-items: center; gap: 8px; }
    .concept-box p { color: #cbd5e1; font-size: 14px; margin: 0; }

    /* 6. 落地流程演进 */
    .process-timeline { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; position: relative; margin-top: 40px; }
    .process-step { background: #fff; border: 1px solid var(--border); border-radius: var(--radius-md); padding: 24px 20px; position: relative; }
    .step-number { font-size: 24px; font-weight: 800; color: var(--primary); margin-bottom: 12px; }
    .process-step h3 { font-size: 16px; margin-bottom: 8px; color: var(--text-main); }
    .process-step p { font-size: 13px; color: var(--text-muted); line-height: 1.6; }

    /* 7. 标杆故事与场景应用 */
    .story-row { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: center; margin-bottom: 40px; }
    .story-row.reverse { direction: rtl; }
    .story-row.reverse .story-text { direction: ltr; }
    .story-img { border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow-md); }
    .story-text h3 { font-size: 22px; color: var(--text-main); margin-bottom: 12px; }
    .story-text p { font-size: 14px; color: var(--text-muted); margin-bottom: 16px; line-height: 1.7; }
    .story-data-badges { display: flex; gap: 12px; }
    .story-data-item { background: var(--primary-light); color: var(--primary); padding: 8px 14px; border-radius: var(--radius-sm); font-size: 13px; font-weight: 600; }

    /* 8. 效能统计条 */
    .stats-bar-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; text-align: center; }
    .stat-card { background: #fff; padding: 32px 20px; border-radius: var(--radius-md); border: 1px solid var(--border); box-shadow: var(--shadow-sm); }
    .stat-val { font-size: 38px; font-weight: 800; color: var(--primary); line-height: 1; margin-bottom: 8px; }
    .stat-label { font-size: 15px; font-weight: 600; color: var(--text-main); margin-bottom: 4px; }
    .stat-sub { font-size: 13px; color: var(--text-muted); }

    /* 9. 客户评价与行业认可 */
    .testimonial-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
    .testimonial-card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius-md); padding: 28px; display: flex; flex-direction: column; justify-content: space-between; }
    .rating-stars { color: #f59e0b; margin-bottom: 14px; font-size: 16px; }
    .testimonial-quote { font-size: 14px; color: var(--text-body); line-height: 1.7; margin-bottom: 20px; font-style: italic; }
    .client-meta { display: flex; align-items: center; gap: 12px; border-top: 1px solid var(--border); padding-top: 16px; }
    .client-avatar { width: 44px; height: 44px; border-radius: 50%; background: #cbd5e1; display: flex; align-items: center; justify-content: center; font-weight: bold; color: #475569; }
    .client-info h4 { font-size: 14px; color: var(--text-main); margin: 0; }
    .client-info span { font-size: 12px; color: var(--text-muted); }

    /* 10. 行业动态与技术白皮书 */
    .insights-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
    .insight-card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius-md); overflow: hidden; display: flex; flex-direction: column; }
    .insight-img { height: 180px; overflow: hidden; }
    .insight-img img { width: 100%; height: 100%; object-fit: cover; transition: var(--transition); }
    .insight-card:hover .insight-img img { transform: scale(1.05); }
    .insight-body { padding: 20px; flex: 1; display: flex; flex-direction: column; }
    .insight-date { font-size: 12px; color: var(--text-muted); margin-bottom: 8px; }
    .insight-body h3 { font-size: 17px; color: var(--text-main); margin-bottom: 10px; line-height: 1.4; }
    .insight-body p { font-size: 13px; color: var(--text-muted); line-height: 1.6; margin-bottom: 16px; flex: 1; }

    /* 11. FAQ 手风琴 */
    .faq-container { max-width: 860px; margin: 0 auto; }
    .faq-item { background: #fff; border: 1px solid var(--border); border-radius: var(--radius-sm); margin-bottom: 12px; overflow: hidden; }
    .faq-header { width: 100%; padding: 18px 24px; text-align: left; background: none; border: none; font-size: 16px; font-weight: 600; color: var(--text-main); display: flex; justify-content: space-between; align-items: center; cursor: pointer; }
    .faq-header span.icon { transition: var(--transition); font-size: 18px; color: var(--primary); }
    .faq-body { padding: 0 24px 18px; font-size: 14px; color: var(--text-muted); line-height: 1.7; display: none; }
    .faq-item.active .faq-body { display: block; }
    .faq-item.active .faq-header span.icon { transform: rotate(180deg); }

    /* 12. 交付保障与在线表单 */
    .contact-grid { display: grid; grid-template-columns: 1fr 1.1fr; gap: 40px; background: #fff; border: 1px solid var(--border); border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow-md); }
    .contact-left { background: var(--dark); color: #fff; padding: 44px; display: flex; flex-direction: column; justify-content: space-between; }
    .contact-left h3 { font-size: 24px; margin-bottom: 16px; color: #fff; }
    .contact-left p { color: #cbd5e1; font-size: 14px; margin-bottom: 30px; }
    .service-guarantees { list-style: none; }
    .service-guarantees li { font-size: 14px; color: #e2e8f0; margin-bottom: 16px; display: flex; align-items: center; gap: 12px; }
    .service-guarantees li strong { color: var(--accent); }
    .contact-right { padding: 44px; }
    .contact-form { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
    .form-group-full { grid-column: span 2; }
    .form-group label { display: block; font-size: 13px; font-weight: 600; color: var(--text-main); margin-bottom: 6px; }
    .form-input, .form-select, .form-textarea { width: 100%; padding: 11px 14px; border: 1px solid var(--border); border-radius: var(--radius-sm); font-size: 14px; color: var(--text-main); outline: none; transition: var(--transition); }
    .form-input:focus, .form-select:focus, .form-textarea:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(0,82,217,0.1); }
    .form-textarea { height: 90px; resize: vertical; }

    /* 页脚 Footer */
    footer { background: var(--dark); color: #94A3B8; font-size: 14px; padding: 60px 0 24px; border-top: 1px solid #334155; }
    .footer-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1.2fr; gap: 40px; margin-bottom: 40px; }
    .footer-col h4 { color: #fff; font-size: 16px; margin-bottom: 18px; font-weight: 600; }
    .footer-col p { font-size: 13px; line-height: 1.7; margin-bottom: 16px; color: #cbd5e1; }
    .footer-links { list-style: none; }
    .footer-links li { margin-bottom: 10px; }
    .footer-links a:hover { color: #fff; }
    .footer-bottom { border-top: 1px solid #1E293B; padding-top: 24px; text-align: center; font-size: 13px; color: #64748B; }

    /* 响应式断点适配 */
    @media (max-width: 1024px) {
      .hero-grid, .overview-grid, .concept-grid, .contact-grid { grid-template-columns: 1fr; }
      .grid-3x2, .product-grid, .testimonial-grid, .insights-grid { grid-template-columns: repeat(2, 1fr); }
      .stats-bar-grid { grid-template-columns: repeat(2, 1fr); }
      .footer-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 768px) {
      .topbar { display: none; }
      .nav-menu { display: none; }
      .mobile-toggle { display: block; }
      .grid-3x2, .product-grid, .testimonial-grid, .insights-grid, .process-timeline { grid-template-columns: 1fr; }
      .story-row, .story-row.reverse { grid-template-columns: 1fr; }
      .hero-params-bar { grid-template-columns: 1fr; }
      .contact-form { grid-template-columns: 1fr; }
      .form-group-full { grid-column: span 1; }
      .section-title { font-size: 26px; }
      .hero-title { font-size: 30px; }
      .footer-grid { grid-template-columns: 1fr; }
    }