/* roulang page: index */
:root {
      --primary: #0F2B48;
      --primary-light: #1E3E62;
      --accent: #00A870;
      --accent-hover: #008f5d;
      --cta-orange: #FF6B00;
      --cta-orange-hover: #e55e00;
      --bg-main: #F8FAFC;
      --bg-card: #FFFFFF;
      --bg-dark: #0A192F;
      --text-main: #1E293B;
      --text-muted: #64748B;
      --border-color: #E2E8F0;
      --radius-md: 10px;
      --radius-lg: 16px;
      --shadow-sm: 0 2px 8px rgba(15, 43, 72, 0.04);
      --shadow-md: 0 10px 25px -5px rgba(15, 43, 72, 0.08);
      --shadow-lg: 0 20px 35px -8px rgba(15, 43, 72, 0.12);
      --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
    }

    *, *::before, *::after {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }

    body {
      font-family: var(--font-sans);
      color: var(--text-main);
      background-color: var(--bg-main);
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: all 0.25s ease;
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    ul, ol {
      list-style: none;
    }

    .container {
      width: 100%;
      max-width: 1240px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 按钮规范 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 12px 28px;
      font-size: 1rem;
      font-weight: 600;
      border-radius: 8px;
      cursor: pointer;
      border: 1px solid transparent;
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
      text-align: center;
    }

    .btn-cta {
      background-color: var(--cta-orange);
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(255, 107, 0, 0.35);
    }
    .btn-cta:hover {
      background-color: var(--cta-orange-hover);
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(255, 107, 0, 0.45);
    }

    .btn-accent {
      background-color: var(--accent);
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(0, 168, 112, 0.3);
    }
    .btn-accent:hover {
      background-color: var(--accent-hover);
      transform: translateY(-2px);
      box-shadow: 0 6px 18px rgba(0, 168, 112, 0.4);
    }

    .btn-outline {
      background-color: transparent;
      border-color: #cbd5e1;
      color: var(--primary);
    }
    .btn-outline:hover {
      border-color: var(--primary);
      background-color: rgba(15, 43, 72, 0.04);
      transform: translateY(-2px);
    }

    .btn-white {
      background-color: #ffffff;
      color: var(--primary);
      font-weight: 700;
    }
    .btn-white:hover {
      background-color: #f1f5f9;
      transform: translateY(-2px);
    }

    /* 标签与徽章 */
    .badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 4px 12px;
      font-size: 0.825rem;
      font-weight: 600;
      border-radius: 20px;
      background: rgba(0, 168, 112, 0.1);
      color: var(--accent);
      margin-bottom: 12px;
    }
    .badge-dark {
      background: rgba(255, 255, 255, 0.15);
      color: #38bdf8;
    }

    /* 标题区域 */
    .section-header {
      text-align: center;
      max-width: 800px;
      margin: 0 auto 50px auto;
    }
    .section-title {
      font-size: 2.1rem;
      font-weight: 800;
      color: var(--primary);
      line-height: 1.35;
      margin-bottom: 16px;
    }
    .section-desc {
      font-size: 1.05rem;
      color: var(--text-muted);
      line-height: 1.8;
    }

    /* 顶部通栏 */
    .topbar {
      background-color: var(--primary);
      color: #94a3b8;
      font-size: 0.85rem;
      padding: 8px 0;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }
    .topbar-content {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .topbar-info {
      display: flex;
      gap: 20px;
    }
    .topbar-info span {
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }

    /* 主导航 */
    .header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      box-shadow: 0 2px 12px rgba(15, 43, 72, 0.06);
      transition: all 0.3s;
    }
    .header-content {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 76px;
    }
    .brand-logo {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 1.35rem;
      font-weight: 800;
      color: var(--primary);
      letter-spacing: -0.5px;
    }
    .brand-logo .logo-icon {
      width: 42px;
      height: 42px;
      background: linear-gradient(135deg, var(--primary), var(--accent));
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: 10px;
      font-size: 1.25rem;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
    }
    .nav-link {
      font-size: 0.95rem;
      font-weight: 600;
      color: var(--text-main);
      padding: 6px 0;
      position: relative;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--accent);
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent);
      transition: width 0.25s;
    }
    .nav-link:hover::after, .nav-link.active::after {
      width: 100%;
    }

    /* 板块通用间距 */
    .section {
      padding: 85px 0;
      position: relative;
    }
    .bg-light {
      background-color: #F1F5F9;
    }
    .bg-white {
      background-color: #FFFFFF;
    }
    .bg-dark-section {
      background-color: var(--bg-dark);
      color: #f8fafc;
    }

    /* Hero Section (5:7 错位布局) */
    .hero-section {
      padding: 70px 0 90px;
      background: linear-gradient(175deg, #ffffff 0%, #f1f6fa 100%);
      overflow: hidden;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 5fr 7fr;
      gap: 40px;
      align-items: center;
    }
    .hero-text h1 {
      font-size: 2.65rem;
      font-weight: 900;
      color: var(--primary);
      line-height: 1.25;
      margin-bottom: 20px;
    }
    .hero-desc {
      font-size: 1.05rem;
      color: var(--text-muted);
      line-height: 1.8;
      margin-bottom: 30px;
    }
    .hero-cta-group {
      display: flex;
      gap: 16px;
      margin-bottom: 36px;
      flex-wrap: wrap;
    }
    .hero-kpis {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 16px;
      border-top: 1px solid var(--border-color);
      padding-top: 24px;
    }
    .kpi-item h4 {
      font-size: 1.5rem;
      font-weight: 800;
      color: var(--primary);
    }
    .kpi-item p {
      font-size: 0.825rem;
      color: var(--text-muted);
    }
    .hero-media {
      position: relative;
    }
    .hero-main-img {
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-lg);
      border: 4px solid #ffffff;
      width: 100%;
      height: 420px;
      object-fit: cover;
    }
    .hero-floating-badge {
      position: absolute;
      bottom: -20px;
      left: -20px;
      background: #ffffff;
      padding: 16px 20px;
      border-radius: 12px;
      box-shadow: var(--shadow-lg);
      display: flex;
      align-items: center;
      gap: 14px;
      border: 1px solid var(--border-color);
    }
    .hero-floating-badge i {
      font-size: 2rem;
      color: var(--accent);
    }

    /* Section 2: 综合概览 */
    .overview-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 50px;
      align-items: center;
    }
    .overview-img-wrap {
      position: relative;
    }
    .overview-img-wrap img {
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-md);
      width: 100%;
      height: 380px;
      object-fit: cover;
    }
    .overview-content h3 {
      font-size: 1.85rem;
      color: var(--primary);
      font-weight: 800;
      margin-bottom: 20px;
      line-height: 1.35;
    }
    .overview-content p {
      color: var(--text-muted);
      margin-bottom: 20px;
    }
    .spec-table {
      width: 100%;
      border-collapse: collapse;
      margin-top: 24px;
    }
    .spec-table td {
      padding: 10px 14px;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.9rem;
    }
    .spec-table td:first-child {
      font-weight: 700;
      color: var(--primary);
      width: 38%;
      background: #f8fafc;
    }

    /* Section 3: 核心优势矩阵 (2x3 Grid) */
    .matrix-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .matrix-card {
      background: #ffffff;
      padding: 32px 28px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      transition: all 0.3s ease;
    }
    .matrix-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-md);
      border-color: var(--accent);
    }
    .matrix-icon {
      width: 54px;
      height: 54px;
      border-radius: 10px;
      background: rgba(0, 168, 112, 0.1);
      color: var(--accent);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.5rem;
      margin-bottom: 20px;
    }
    .matrix-card h3 {
      font-size: 1.25rem;
      color: var(--primary);
      margin-bottom: 12px;
      font-weight: 700;
    }
    .matrix-card p {
      font-size: 0.925rem;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* Section 4: 细分场景模块 (3列大卡片) */
    .scene-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }
    .scene-card {
      background: #ffffff;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      overflow: hidden;
      display: flex;
      flex-direction: column;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s;
    }
    .scene-card:hover {
      box-shadow: var(--shadow-lg);
      transform: translateY(-5px);
    }
    .scene-thumb {
      height: 200px;
      width: 100%;
      object-fit: cover;
    }
    .scene-body {
      padding: 26px;
      flex: 1;
      display: flex;
      flex-direction: column;
    }
    .scene-body h3 {
      font-size: 1.35rem;
      color: var(--primary);
      margin-bottom: 12px;
      font-weight: 700;
    }
    .scene-body p {
      font-size: 0.925rem;
      color: var(--text-muted);
      margin-bottom: 18px;
      line-height: 1.7;
    }
    .scene-features {
      margin-bottom: 24px;
      flex: 1;
    }
    .scene-features li {
      font-size: 0.875rem;
      color: #334155;
      margin-bottom: 8px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .scene-features li i {
      color: var(--accent);
      font-size: 0.8rem;
    }

    /* Section 5: 差异化对比 (Table Style) */
    .compare-container {
      background: #ffffff;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
    }
    .compare-table th {
      background: var(--primary);
      color: #ffffff;
      padding: 20px 24px;
      font-size: 1.05rem;
    }
    .compare-table th.highlight {
      background: var(--accent);
    }
    .compare-table td {
      padding: 18px 24px;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.95rem;
    }
    .compare-table tr:hover td {
      background: #f8fafc;
    }
    .compare-table td.sys-val {
      color: var(--accent);
      font-weight: 600;
    }
    .compare-table td.old-val {
      color: #94a3b8;
    }

    /* Section 6: 深色工业控制台案例 */
    .dark-console-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }
    .console-terminal {
      background: #0f172a;
      border: 1px solid #1e293b;
      border-radius: var(--radius-md);
      padding: 24px;
      font-family: monospace;
      color: #38bdf8;
      box-shadow: 0 10px 30px rgba(0,0,0,0.5);
    }
    .console-header-dots {
      display: flex;
      gap: 6px;
      margin-bottom: 16px;
    }
    .console-header-dots span {
      width: 10px;
      height: 10px;
      border-radius: 50%;
      background: #475569;
    }
    .console-header-dots span:nth-child(1) { background: #ef4444; }
    .console-header-dots span:nth-child(2) { background: #f59e0b; }
    .console-header-dots span:nth-child(3) { background: #10b981; }

    /* Section 7: 用户实践故事 (交错式卡片) */
    .story-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 30px;
    }
    .story-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .story-tag {
      font-size: 0.8rem;
      font-weight: 700;
      color: var(--accent);
      text-transform: uppercase;
    }
    .story-card h3 {
      font-size: 1.3rem;
      color: var(--primary);
    }
    .story-card p {
      font-size: 0.925rem;
      color: var(--text-muted);
      line-height: 1.75;
    }

    /* Section 8: 核心指标统计条 */
    .metrics-bar {
      background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
      color: #ffffff;
      padding: 60px 0;
    }
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      text-align: center;
    }
    .metric-box h3 {
      font-size: 2.8rem;
      font-weight: 900;
      color: #38bdf8;
      line-height: 1.2;
      margin-bottom: 8px;
    }
    .metric-box p {
      font-size: 0.95rem;
      color: #cbd5e1;
    }

    /* Section 9: 客户评价 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .testi-card {
      background: #ffffff;
      padding: 30px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .testi-stars {
      color: #f59e0b;
      margin-bottom: 16px;
    }
    .testi-card p {
      font-size: 0.95rem;
      color: #475569;
      line-height: 1.7;
      margin-bottom: 20px;
      font-style: italic;
    }
    .testi-user {
      display: flex;
      align-items: center;
      gap: 14px;
    }
    .testi-avatar {
      width: 46px;
      height: 46px;
      border-radius: 50%;
      background: #e2e8f0;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      font-weight: 700;
    }
    .testi-info h4 {
      font-size: 0.95rem;
      color: var(--primary);
    }
    .testi-info span {
      font-size: 0.8rem;
      color: var(--text-muted);
    }

    /* Section 10: 行业资讯与证据 */
    .news-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .news-card {
      background: #ffffff;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s;
    }
    .news-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .news-img {
      height: 180px;
      width: 100%;
      object-fit: cover;
    }
    .news-body {
      padding: 22px;
    }
    .news-meta {
      font-size: 0.8rem;
      color: var(--text-muted);
      margin-bottom: 8px;
    }
    .news-body h3 {
      font-size: 1.15rem;
      color: var(--primary);
      margin-bottom: 10px;
      line-height: 1.4;
    }
    .news-body p {
      font-size: 0.875rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* Section 11: 疑难解答 FAQ (手风琴) */
    .faq-container {
      max-width: 860px;
      margin: 0 auto;
    }
    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      margin-bottom: 14px;
      overflow: hidden;
    }
    .faq-question {
      padding: 20px 24px;
      font-weight: 700;
      color: var(--primary);
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-size: 1.05rem;
      user-select: none;
    }
    .faq-question i {
      transition: transform 0.3s ease;
      color: var(--text-muted);
    }
    .faq-answer {
      padding: 0 24px 20px 24px;
      color: var(--text-muted);
      font-size: 0.95rem;
      line-height: 1.8;
      display: none;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    .faq-item.active .faq-question i {
      transform: rotate(180deg);
      color: var(--accent);
    }

    /* Section 12: 底部强转化与保障 */
    .cta-wrapper {
      background: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 48px;
      box-shadow: var(--shadow-lg);
    }
    .cta-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }
    .guarantee-badges {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
      margin-top: 24px;
    }
    .badge-card {
      padding: 16px;
      background: #ffffff;
      border-radius: 8px;
      border: 1px solid var(--border-color);
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .badge-card i {
      font-size: 1.5rem;
      color: var(--accent);
    }
    .badge-card h5 {
      font-size: 0.95rem;
      color: var(--primary);
    }
    .badge-card p {
      font-size: 0.775rem;
      color: var(--text-muted);
    }
    .demo-form {
      background: #ffffff;
      padding: 30px;
      border-radius: 12px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .form-group {
      margin-bottom: 16px;
    }
    .form-group label {
      display: block;
      font-size: 0.875rem;
      font-weight: 600;
      color: var(--primary);
      margin-bottom: 6px;
    }
    .form-control {
      width: 100%;
      padding: 12px 14px;
      border: 1px solid var(--border-color);
      border-radius: 6px;
      font-size: 0.925rem;
      outline: none;
      transition: border-color 0.25s;
    }
    .form-control:focus {
      border-color: var(--accent);
    }

    /* 页脚 Footer */
    .footer {
      background-color: #0A192F;
      color: #94a3b8;
      padding: 60px 0 30px;
      font-size: 0.9rem;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    .footer-col h4 {
      color: #ffffff;
      font-size: 1.05rem;
      margin-bottom: 20px;
      font-weight: 700;
    }
    .footer-links li {
      margin-bottom: 10px;
    }
    .footer-links a:hover {
      color: #38bdf8;
    }
    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      padding-top: 24px;
      text-align: center;
      font-size: 0.85rem;
    }

    /* 移动端固定底部转化栏 */
    .mobile-sticky-bar {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      right: 0;
      background: #ffffff;
      border-top: 1px solid var(--border-color);
      padding: 10px 16px;
      box-shadow: 0 -4px 12px rgba(0, 0, 0, 0.08);
      z-index: 999;
      justify-content: space-between;
      gap: 10px;
    }
    .mobile-sticky-bar .btn {
      flex: 1;
      padding: 10px 12px;
      font-size: 0.9rem;
    }

    /* 响应式断点 */
    @media (max-width: 1024px) {
      .hero-grid, .overview-grid, .dark-console-grid, .cta-grid {
        grid-template-columns: 1fr;
      }
      .matrix-grid, .scene-grid, .news-grid, .testimonial-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .metrics-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 30px;
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .topbar {
        display: none;
      }
      .nav-links {
        display: none; /* 移动端可隐藏或简易平滑折叠 */
      }
      .matrix-grid, .scene-grid, .news-grid, .story-grid, .testimonial-grid {
        grid-template-columns: 1fr;
      }
      .hero-text h1 {
        font-size: 2rem;
      }
      .hero-kpis {
        grid-template-columns: 1fr;
      }
      .hero-main-img {
        height: 280px;
      }
      .hero-floating-badge {
        display: none;
      }
      .section {
        padding: 55px 0;
      }
      .mobile-sticky-bar {
        display: flex;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .cta-wrapper {
        padding: 24px;
      }
      .guarantee-badges {
        grid-template-columns: 1fr;
      }
    }