/* roulang page: index */
:root {
      --primary: #1E2229;
      --primary-dark: #0F1216;
      --secondary: #E65C00;
      --secondary-hover: #D45300;
      --bg-light: #F7F8FA;
      --bg-white: #FFFFFF;
      --text-main: #11141A;
      --text-muted: #4B5363;
      --text-light: #8A94A6;
      --border-color: #E2E5EB;
      --border-dark: #2C323E;
      --radius: 4px;
      --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
      --shadow-hover: 0 12px 24px rgba(0, 0, 0, 0.08);
      --font-family: -apple-system, "PingFang SC", "Noto Sans SC", "Microsoft YaHei", sans-serif;
      --transition: 0.25s cubic-bezier(0.16, 1, 0.3, 1);
    }
    * { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; font-family: var(--font-family); color: var(--text-main); background-color: var(--bg-white); }
    body { line-height: 1.6; overflow-x: hidden; }
    a { text-decoration: none; color: inherit; transition: var(--transition); }
    img { max-width: 100%; height: auto; display: block; }
    button, input, select, textarea { font-family: inherit; font-size: inherit; }
    .tabular-nums { font-variant-numeric: tabular-nums; }
    .container { width: 100%; max-width: 1240px; margin: 0 auto; padding: 0 24px; }
    .section-pad { padding: 100px 0; }
    .section-pad-sm { padding: 64px 0; }
    .bg-alt { background-color: var(--bg-light); border-top: 1px solid var(--border-color); border-bottom: 1px solid var(--border-color); }
    .bg-dark { background-color: var(--primary-dark); color: #fff; }
    .text-center { text-align: center; }
    .text-orange { color: var(--secondary); }

    /* 顶部状态栏与主导航 */
    .top-bar { background: var(--primary-dark); color: var(--text-light); font-size: 13px; padding: 8px 0; border-bottom: 1px solid var(--border-dark); }
    .top-bar-inner { display: flex; justify-content: space-between; align-items: center; }
    .top-bar-left span { margin-right: 24px; display: inline-flex; align-items: center; gap: 6px; }
    .header-main { position: sticky; top: 0; z-index: 100; background: rgba(255, 255, 255, 0.98); backdrop-filter: blur(8px); border-bottom: 1px solid var(--border-color); }
    .nav-inner { display: flex; align-items: center; justify-content: space-between; height: 76px; }
    .brand-logo { font-size: 22px; font-weight: 700; color: var(--primary); display: flex; align-items: center; gap: 10px; letter-spacing: 0.5px; }
    .brand-logo svg { width: 30px; height: 30px; fill: var(--secondary); }
    .nav-links { display: flex; align-items: center; gap: 28px; list-style: none; }
    .nav-links a { font-size: 15px; font-weight: 500; color: var(--text-main); position: relative; padding: 6px 0; }
    .nav-links a:hover { color: var(--secondary); }
    .nav-links a::after { content: ''; position: absolute; bottom: 0; left: 0; width: 0; height: 2px; background: var(--secondary); transition: var(--transition); }
    .nav-links a:hover::after { width: 100%; }
    .btn { display: inline-flex; align-items: center; justify-content: center; padding: 12px 26px; border-radius: var(--radius); font-weight: 600; font-size: 15px; cursor: pointer; transition: var(--transition); border: 1px solid transparent; }
    .btn-primary { background: var(--secondary); color: #fff; }
    .btn-primary:hover { background: var(--secondary-hover); }
    .btn-outline { border-color: var(--secondary); color: var(--secondary); background: transparent; }
    .btn-outline:hover { background: var(--secondary); color: #fff; }
    .btn-dark { background: var(--primary); color: #fff; }
    .btn-dark:hover { background: #2f3642; }

    /* 标题统一样式 */
    .sec-tag { font-size: 13px; font-weight: 700; text-transform: uppercase; color: var(--secondary); letter-spacing: 1.5px; margin-bottom: 10px; display: inline-block; }
    .sec-title { font-size: 34px; font-weight: 700; color: var(--primary); margin-bottom: 16px; line-height: 1.3; }
    .sec-title.text-white { color: #fff; }
    .sec-desc { font-size: 16px; color: var(--text-muted); line-height: 1.7; max-width: 820px; margin: 0 auto 50px; }
    .sec-desc.text-left { margin-left: 0; margin-right: 0; }
    .sec-desc.text-gray { color: #A0AEC0; }

    /* 1. 首屏 Hero */
    .hero-sec { position: relative; background: #0b0d10 url('/assets/images/3bf2ed1ab064d42e.png') center/cover no-repeat; padding: 120px 0 110px; color: #fff; overflow: hidden; }
    .hero-overlay { position: absolute; inset: 0; background: linear-gradient(90deg, rgba(11,13,16,0.95) 0%, rgba(15,18,22,0.85) 60%, rgba(15,18,22,0.6) 100%); z-index: 1; }
    .hero-grid { position: relative; z-index: 2; display: grid; grid-template-columns: 1.25fr 0.95fr; gap: 48px; align-items: center; }
    .hero-content h1 { font-size: 46px; font-weight: 800; line-height: 1.22; margin-bottom: 22px; letter-spacing: -0.5px; }
    .hero-content p { font-size: 16px; line-height: 1.75; color: #cbd5e1; margin-bottom: 32px; }
    .hero-btns { display: flex; gap: 16px; }
    .hero-quick-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; background: rgba(30, 34, 41, 0.7); border: 1px solid var(--border-dark); padding: 24px; border-radius: var(--radius); backdrop-filter: blur(10px); }
    .quick-card { background: rgba(15, 18, 22, 0.85); border: 1px solid rgba(255,255,255,0.08); padding: 20px; border-radius: var(--radius); transition: var(--transition); }
    .quick-card:hover { border-color: var(--secondary); transform: translateY(-4px); }
    .quick-card h4 { font-size: 17px; margin-bottom: 8px; color: #fff; }
    .quick-card p { font-size: 13px; color: #94a3b8; line-height: 1.5; }

    /* 2. 安全主张与合规 */
    .pillar-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
    .pillar-card { border: 1px solid var(--border-color); padding: 36px 30px; background: var(--bg-white); border-radius: var(--radius); border-left: 4px solid var(--primary); transition: var(--transition); }
    .pillar-card:hover { border-left-color: var(--secondary); box-shadow: var(--shadow-hover); transform: translateY(-4px); }
    .pillar-card h3 { font-size: 20px; margin-bottom: 12px; color: var(--primary); }
    .pillar-card p { font-size: 14px; color: var(--text-muted); line-height: 1.65; }

    /* 3. 核心优势技术矩阵 */
    .feat-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
    .feat-card { background: var(--bg-white); border: 1px solid var(--border-color); padding: 36px 28px; border-radius: var(--radius); transition: var(--transition); }
    .feat-card:hover { border-color: var(--secondary); box-shadow: var(--shadow-hover); transform: translateY(-4px); }
    .feat-badge { display: inline-block; font-size: 12px; font-weight: 700; color: var(--secondary); background: rgba(230, 92, 0, 0.08); padding: 4px 10px; border-radius: 2px; margin-bottom: 16px; }
    .feat-card h3 { font-size: 19px; margin-bottom: 12px; color: var(--primary); }
    .feat-card p { font-size: 14px; color: var(--text-muted); line-height: 1.65; }

    /* 4. 旗舰机型展示 */
    .product-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; }
    .prod-card { background: var(--bg-white); border: 1px solid var(--border-color); border-radius: var(--radius); overflow: hidden; display: flex; flex-direction: column; transition: var(--transition); }
    .prod-card:hover { border-color: var(--secondary); box-shadow: var(--shadow-hover); transform: translateY(-4px); }
    .prod-img-box { height: 230px; overflow: hidden; background: #eaedf2; position: relative; }
    .prod-img-box img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s ease; }
    .prod-card:hover .prod-img-box img { transform: scale(1.05); }
    .prod-body { padding: 28px; flex: 1; display: flex; flex-direction: column; }
    .prod-meta { display: flex; gap: 8px; margin-bottom: 12px; }
    .prod-tag { font-size: 12px; background: var(--bg-light); border: 1px solid var(--border-color); padding: 2px 8px; border-radius: 2px; color: var(--text-muted); }
    .prod-title { font-size: 21px; font-weight: 700; margin-bottom: 10px; color: var(--primary); }
    .prod-desc { font-size: 14px; color: var(--text-muted); margin-bottom: 20px; line-height: 1.6; flex: 1; }
    .prod-specs { border-top: 1px dashed var(--border-color); padding-top: 16px; display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; font-size: 13px; margin-bottom: 20px; }
    .spec-item span { display: block; color: var(--text-light); }
    .spec-item strong { color: var(--primary); font-size: 15px; }

    /* 5. 深色重载案例与工程理念 */
    .philo-box { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 48px; align-items: center; background: #161a22; border: 1px solid var(--border-dark); border-radius: var(--radius); padding: 48px; }
    .philo-content h3 { font-size: 28px; color: #fff; margin-bottom: 18px; }
    .philo-content p { font-size: 15px; color: #cbd5e1; line-height: 1.7; margin-bottom: 24px; }
    .philo-list { list-style: none; margin-bottom: 28px; }
    .philo-list li { margin-bottom: 12px; font-size: 14px; color: #cbd5e1; display: flex; align-items: center; gap: 10px; }
    .philo-list li::before { content: '■'; color: var(--secondary); font-size: 12px; }
    .philo-img { border-radius: var(--radius); overflow: hidden; border: 1px solid var(--border-dark); }

    /* 6. 作业检查项与执行指标 */
    .checklist-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
    .check-card { background: var(--bg-white); border: 1px solid var(--border-color); padding: 24px 20px; border-radius: var(--radius); }
    .check-idx { font-size: 22px; font-weight: 800; color: var(--secondary); margin-bottom: 10px; font-family: monospace; }
    .check-card h4 { font-size: 16px; margin-bottom: 8px; color: var(--primary); }
    .check-card p { font-size: 13px; color: var(--text-muted); line-height: 1.6; }

    /* 7. 行业纵深用户作业全景 */
    .story-card-item { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: center; margin-bottom: 50px; background: var(--bg-white); border: 1px solid var(--border-color); border-radius: var(--radius); overflow: hidden; }
    .story-card-item:last-child { margin-bottom: 0; }
    .story-card-item.reverse { direction: rtl; }
    .story-card-item.reverse .story-detail { direction: ltr; }
    .story-img-box { height: 360px; overflow: hidden; }
    .story-img-box img { width: 100%; height: 100%; object-fit: cover; }
    .story-detail { padding: 40px; }
    .story-cat { font-size: 12px; font-weight: 700; color: var(--secondary); margin-bottom: 8px; display: inline-block; }
    .story-detail h3 { font-size: 22px; margin-bottom: 14px; color: var(--primary); }
    .story-detail p { font-size: 14px; color: var(--text-muted); line-height: 1.7; margin-bottom: 20px; }
    .efficiency-bar { background: var(--bg-light); border: 1px solid var(--border-color); padding: 12px 16px; border-radius: var(--radius); display: flex; justify-content: space-between; align-items: center; font-size: 13px; }

    /* 8. 硬核作业数据统计横条 */
    .stat-banner { background: #13171f; border-top: 1px solid var(--border-dark); border-bottom: 1px solid var(--border-dark); padding: 48px 0; color: #fff; }
    .stat-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; text-align: center; }
    .stat-val { font-size: 42px; font-weight: 800; color: var(--secondary); margin-bottom: 6px; }
    .stat-title { font-size: 15px; color: #cbd5e1; font-weight: 600; margin-bottom: 4px; }
    .stat-sub { font-size: 12px; color: #64748b; }

    /* 9. 作业边界与环境耐受说明 */
    .boundary-table-wrap { overflow-x: auto; background: var(--bg-white); border: 1px solid var(--border-color); border-radius: var(--radius); }
    .boundary-table { width: 100%; border-collapse: collapse; text-align: left; font-size: 14px; }
    .boundary-table th { background: var(--bg-light); padding: 16px 20px; font-weight: 700; color: var(--primary); border-bottom: 1px solid var(--border-color); }
    .boundary-table td { padding: 16px 20px; border-bottom: 1px solid var(--border-color); color: var(--text-muted); }
    .boundary-table tr:last-child td { border-bottom: none; }
    .boundary-table tr:hover td { background: #fafafa; }

    /* 10. 客户评价与采纳证明 */
    .testi-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
    .testi-card { background: var(--bg-white); border: 1px solid var(--border-color); padding: 36px 30px; border-radius: var(--radius); display: flex; flex-direction: column; position: relative; }
    .testi-quote { font-size: 38px; line-height: 1; color: var(--secondary); margin-bottom: 16px; font-family: Georgia, serif; }
    .testi-text { font-size: 14px; color: var(--text-muted); line-height: 1.7; flex: 1; margin-bottom: 24px; }
    .testi-user { display: flex; align-items: center; gap: 14px; border-top: 1px dashed var(--border-color); padding-top: 18px; }
    .user-avatar { width: 44px; height: 44px; border-radius: 50%; background: #e2e8f0; display: flex; align-items: center; justify-content: center; font-weight: 700; color: var(--primary); }
    .user-info h5 { font-size: 15px; color: var(--primary); }
    .user-info p { font-size: 12px; color: var(--text-light); }

    /* 11. 行业资讯与作业规范 */
    .news-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
    .news-card { background: var(--bg-white); border: 1px solid var(--border-color); border-radius: var(--radius); overflow: hidden; display: flex; flex-direction: column; }
    .news-card:hover { border-color: var(--secondary); box-shadow: var(--shadow-hover); }
    .news-img { height: 190px; overflow: hidden; background: #e2e8f0; }
    .news-img img { width: 100%; height: 100%; object-fit: cover; }
    .news-body { padding: 24px; flex: 1; display: flex; flex-direction: column; }
    .news-date { font-size: 12px; color: var(--text-light); margin-bottom: 8px; }
    .news-card h3 { font-size: 17px; margin-bottom: 10px; line-height: 1.4; color: var(--primary); }
    .news-card p { font-size: 13px; color: var(--text-muted); line-height: 1.6; margin-bottom: 18px; flex: 1; }
    .news-link { font-size: 13px; font-weight: 600; color: var(--secondary); display: inline-flex; align-items: center; gap: 4px; }

    /* 12. 深度技术解答 FAQ */
    .faq-container { max-width: 860px; margin: 0 auto; }
    .faq-item { border: 1px solid var(--border-color); border-radius: var(--radius); margin-bottom: 16px; background: var(--bg-white); overflow: hidden; }
    .faq-item summary { list-style: none; padding: 20px 24px; font-size: 16px; font-weight: 600; color: var(--primary); cursor: pointer; display: flex; justify-content: space-between; align-items: center; user-select: none; }
    .faq-item summary::-webkit-details-marker { display: none; }
    .faq-item summary::after { content: '+'; font-size: 20px; color: var(--secondary); font-weight: 400; transition: transform var(--transition); }
    .faq-item[open] summary::after { transform: rotate(45deg); }
    .faq-item[open] summary { border-bottom: 1px solid var(--border-color); background: var(--bg-light); }
    .faq-content { padding: 20px 24px; font-size: 14px; color: var(--text-muted); line-height: 1.7; background: #fff; }

    /* 13. 交付保障流程链条 */
    .flow-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; position: relative; }
    .flow-step { background: var(--bg-white); border: 1px solid var(--border-color); padding: 32px 24px; border-radius: var(--radius); position: relative; }
    .flow-num { width: 36px; height: 36px; border-radius: 50%; background: var(--primary); color: #fff; display: flex; align-items: center; justify-content: center; font-weight: 700; margin-bottom: 16px; font-size: 14px; }
    .flow-step:hover .flow-num { background: var(--secondary); }
    .flow-step h4 { font-size: 17px; margin-bottom: 10px; color: var(--primary); }
    .flow-step p { font-size: 13px; color: var(--text-muted); line-height: 1.6; }

    /* 14. 商务选型与技术对接表单 */
    .contact-box { background: var(--bg-white); border: 1px solid var(--border-color); border-radius: var(--radius); overflow: hidden; display: grid; grid-template-columns: 1fr 1.3fr; }
    .contact-info { background: var(--primary); color: #fff; padding: 50px 40px; display: flex; flex-direction: column; justify-content: space-between; }
    .contact-info h3 { font-size: 26px; margin-bottom: 16px; }
    .contact-info p { font-size: 14px; color: #cbd5e1; line-height: 1.7; margin-bottom: 30px; }
    .info-list { list-style: none; }
    .info-list li { margin-bottom: 18px; font-size: 14px; display: flex; align-items: flex-start; gap: 12px; }
    .info-icon { color: var(--secondary); font-weight: 700; }
    .contact-form { padding: 50px 40px; background: #fff; }
    .form-group { margin-bottom: 20px; }
    .form-label { display: block; font-size: 13px; font-weight: 600; color: var(--primary); margin-bottom: 6px; }
    .form-control { width: 100%; padding: 12px 14px; border: 1px solid var(--border-color); border-radius: var(--radius); font-size: 14px; outline: none; transition: var(--transition); background: var(--bg-light); }
    .form-control:focus { border-color: var(--secondary); background: #fff; }
    .form-grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
    .form-tip { font-size: 12px; color: var(--text-light); margin-top: 10px; }

    /* 统一页脚 */
    .site-footer { background: var(--primary-dark); color: #94a3b8; border-top: 1px solid var(--border-dark); padding-top: 70px; font-size: 14px; }
    .footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.2fr; gap: 40px; margin-bottom: 60px; }
    .footer-col h4 { font-size: 16px; color: #fff; margin-bottom: 20px; font-weight: 600; position: relative; padding-bottom: 8px; }
    .footer-col h4::after { content: ''; position: absolute; bottom: 0; left: 0; width: 24px; height: 2px; background: var(--secondary); }
    .footer-col p { line-height: 1.7; margin-bottom: 16px; font-size: 13px; }
    .footer-links { list-style: none; }
    .footer-links li { margin-bottom: 10px; }
    .footer-links a:hover { color: var(--secondary); padding-left: 4px; }
    .footer-bottom { border-top: 1px solid var(--border-dark); padding: 24px 0; font-size: 13px; text-align: center; color: #64748b; }

    /* 移动端汉堡切换 */
    .menu-toggle { display: none; background: transparent; border: none; font-size: 24px; cursor: pointer; color: var(--primary); width: 44px; height: 44px; }
    
    /* 响应式断点 */
    @media (max-width: 1024px) {
      .hero-grid { grid-template-columns: 1fr; gap: 36px; }
      .pillar-grid, .feat-grid, .product-grid, .testi-grid, .news-grid { grid-template-columns: repeat(2, 1fr); }
      .checklist-grid, .flow-grid, .stat-grid { grid-template-columns: repeat(2, 1fr); }
      .philo-box { grid-template-columns: 1fr; padding: 32px; }
      .contact-box { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 768px) {
      .section-pad { padding: 60px 0; }
      .top-bar { display: none; }
      .menu-toggle { display: block; }
      .nav-links { display: none; position: absolute; top: 76px; left: 0; width: 100%; background: #fff; flex-direction: column; padding: 20px 24px; border-bottom: 1px solid var(--border-color); box-shadow: 0 10px 20px rgba(0,0,0,0.05); }
      .nav-links.active { display: flex; }
      .hero-content h1 { font-size: 30px; }
      .hero-quick-grid { grid-template-columns: 1fr; }
      .pillar-grid, .feat-grid, .product-grid, .testi-grid, .news-grid, .checklist-grid, .flow-grid, .stat-grid { grid-template-columns: 1fr; }
      .story-card-item, .story-card-item.reverse { grid-template-columns: 1fr; }
      .story-img-box { height: 240px; }
      .story-detail { padding: 24px; }
      .form-grid-2 { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .hero-btns { flex-direction: column; }
    }