/* roulang page: index */
:root {
      --bg-main: #FAFAFA;
      --bg-white: #FFFFFF;
      --bg-card: #FFFFFF;
      --bg-alt: #F4F5F7;
      --bg-dark: #0D0F12;
      --bg-dark-card: #16191E;
      --primary: #00C274;
      --primary-hover: #00A862;
      --primary-light: rgba(0, 194, 116, 0.1);
      --title-color: #0A2E2B;
      --text-main: #2C3437;
      --text-muted: #5E6470;
      --border-color: #E5E7EB;
      --border-light: rgba(0, 0, 0, 0.08);
      --shadow-sm: 0 4px 20px -2px rgba(0, 0, 0, 0.05);
      --shadow-md: 0 10px 25px -4px rgba(0, 0, 0, 0.08);
      --radius: 8px;
      --font-mono: 'SF Pro Display', 'Inter', -apple-system, BlinkMacSystemFont, monospace;
    }
    * { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-main);
      color: var(--text-main);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    a { text-decoration: none; color: inherit; transition: all 0.25s ease; }
    ul { list-style: none; }
    img { max-width: 100%; height: auto; display: block; }
    button, input, textarea, select { font-family: inherit; }

    .container {
      max-width: 1240px;
      margin: 0 auto;
      padding: 0 24px;
    }
    .section-padding { padding: 90px 0; }
    .section-padding-dark { padding: 110px 0; background-color: var(--bg-dark); color: #F3F4F6; }
    
    .sec-header {
      text-align: center;
      max-width: 780px;
      margin: 0 auto 56px auto;
    }
    .badge {
      display: inline-block;
      padding: 6px 14px;
      font-size: 13px;
      font-weight: 600;
      color: var(--primary);
      background: var(--primary-light);
      border-radius: 4px;
      margin-bottom: 14px;
      letter-spacing: 0.5px;
    }
    .sec-title {
      font-size: 32px;
      font-weight: 700;
      color: var(--title-color);
      line-height: 1.35;
      margin-bottom: 16px;
    }
    .sec-desc {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.75;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 13px 28px;
      font-size: 15px;
      font-weight: 600;
      border-radius: 4px;
      cursor: pointer;
      border: 1px solid transparent;
      transition: all 0.25s ease;
      text-align: center;
    }
    .btn-primary {
      background-color: var(--primary);
      color: #FFFFFF;
      box-shadow: 0 4px 14px rgba(0, 194, 116, 0.35);
    }
    .btn-primary:hover {
      background-color: var(--primary-hover);
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(0, 194, 116, 0.45);
    }
    .btn-outline {
      border-color: var(--border-color);
      color: var(--title-color);
      background-color: #FFFFFF;
    }
    .btn-outline:hover {
      border-color: var(--primary);
      color: var(--primary);
      transform: translateY(-2px);
    }

    /* 顶部通栏 */
    .top-bar {
      background: #F3F4F6;
      border-bottom: 1px solid var(--border-color);
      font-size: 13px;
      color: var(--text-muted);
      padding: 8px 0;
    }
    .top-bar-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .top-info span { margin-right: 20px; }

    /* 导航栏 */
    .navbar {
      position: sticky;
      top: 0;
      background: rgba(255, 255, 255, 0.96);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border-color);
      z-index: 1000;
      transition: all 0.3s ease;
    }
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      height: 74px;
    }
    .logo-text {
      font-size: 20px;
      font-weight: 800;
      color: var(--title-color);
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo-badge {
      width: 10px;
      height: 10px;
      background: var(--primary);
      border-radius: 50%;
      display: inline-block;
    }
    .nav-menu {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-link {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-main);
      position: relative;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--primary);
    }
    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      cursor: pointer;
      color: var(--title-color);
    }

    /* 板块 1: Hero 对比选型 */
    .hero-section {
      position: relative;
      background-image: linear-gradient(rgba(10, 46, 43, 0.88), rgba(13, 15, 18, 0.94)), url('/assets/images/454029e0a0416b9b.png');
      background-size: cover;
      background-position: center;
      padding: 90px 0 100px 0;
      color: #FFFFFF;
    }
    .hero-content {
      text-align: center;
      max-width: 900px;
      margin: 0 auto 50px auto;
    }
    .hero-title {
      font-size: 42px;
      line-height: 1.28;
      font-weight: 800;
      letter-spacing: -0.5px;
      margin-bottom: 20px;
      color: #FFFFFF;
    }
    .hero-lead {
      font-size: 17px;
      line-height: 1.8;
      color: #D1D5DB;
      margin-bottom: 30px;
    }
    .hero-plans-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      align-items: stretch;
    }
    .plan-card {
      background: rgba(255, 255, 255, 0.05);
      backdrop-filter: blur(8px);
      border: 1px solid rgba(255, 255, 255, 0.15);
      border-radius: var(--radius);
      padding: 34px 28px;
      display: flex;
      flex-direction: column;
      position: relative;
      transition: transform 0.3s ease, border-color 0.3s ease;
    }
    .plan-card:hover {
      transform: translateY(-5px);
    }
    .plan-card.featured {
      background: #FFFFFF;
      color: var(--text-main);
      border: 2px solid var(--primary);
      box-shadow: 0 16px 36px rgba(0, 0, 0, 0.25);
      transform: translateY(-8px);
    }
    .plan-tag {
      position: absolute;
      top: -14px;
      left: 50%;
      transform: translateX(-50%);
      background: var(--primary);
      color: #FFFFFF;
      font-size: 12px;
      font-weight: 700;
      padding: 4px 14px;
      border-radius: 20px;
      white-space: nowrap;
    }
    .plan-title {
      font-size: 20px;
      font-weight: 700;
      margin-bottom: 12px;
    }
    .plan-card.featured .plan-title { color: var(--title-color); }
    .plan-desc {
      font-size: 14px;
      line-height: 1.6;
      margin-bottom: 20px;
      color: #9CA3AF;
    }
    .plan-card.featured .plan-desc { color: var(--text-muted); }
    .plan-features {
      margin-bottom: 28px;
      flex-grow: 1;
      border-top: 1px solid rgba(255, 255, 255, 0.1);
      padding-top: 18px;
    }
    .plan-card.featured .plan-features { border-top: 1px solid var(--border-color); }
    .plan-features li {
      font-size: 14px;
      margin-bottom: 10px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .plan-features li::before {
      content: "✓";
      color: var(--primary);
      font-weight: bold;
    }

    /* 板块 2: 资料目录树 */
    .catalog-section { background-color: var(--bg-white); }
    .catalog-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .catalog-box {
      border: 1px solid var(--border-light);
      border-radius: var(--radius);
      padding: 24px;
      background: var(--bg-main);
      transition: all 0.25s ease;
    }
    .catalog-box:hover {
      border-color: var(--primary);
      box-shadow: var(--shadow-sm);
    }
    .catalog-category {
      font-size: 17px;
      font-weight: 700;
      color: var(--title-color);
      margin-bottom: 16px;
      padding-bottom: 8px;
      border-bottom: 2px solid var(--primary);
      display: inline-block;
    }
    .catalog-items li {
      font-size: 14px;
      color: var(--text-muted);
      margin-bottom: 12px;
      padding-left: 12px;
      position: relative;
    }
    .catalog-items li::before {
      content: "";
      position: absolute;
      left: 0;
      top: 9px;
      width: 4px;
      height: 4px;
      background: var(--primary);
      border-radius: 50%;
    }

    /* 板块 3: 核心价值点 */
    .value-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .value-card {
      background: #FFFFFF;
      border: 1px solid var(--border-light);
      border-radius: var(--radius);
      padding: 32px 26px;
      transition: all 0.3s ease;
    }
    .value-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: var(--primary);
    }
    .value-icon {
      width: 48px;
      height: 48px;
      background: var(--primary-light);
      border-radius: 6px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      font-weight: 800;
      font-size: 20px;
      margin-bottom: 20px;
    }
    .value-title {
      font-size: 19px;
      font-weight: 700;
      color: var(--title-color);
      margin-bottom: 12px;
    }
    .value-text {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 板块 4: 关键图表与归因引擎 (深色反差) */
    .architecture-box {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .arch-content h3 {
      font-size: 28px;
      color: #FFFFFF;
      margin-bottom: 20px;
      line-height: 1.35;
    }
    .arch-content p {
      color: #9CA3AF;
      margin-bottom: 24px;
      line-height: 1.8;
      font-size: 15px;
    }
    .arch-flow {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .flow-step {
      background: var(--bg-dark-card);
      border: 1px solid rgba(255, 255, 255, 0.08);
      border-radius: var(--radius);
      padding: 16px 20px;
      display: flex;
      align-items: center;
      gap: 16px;
    }
    .flow-num {
      width: 32px;
      height: 32px;
      border-radius: 4px;
      background: var(--primary);
      color: #FFFFFF;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-family: var(--font-mono);
    }
    .flow-title { font-size: 15px; font-weight: 600; color: #FFFFFF; }
    .flow-sub { font-size: 13px; color: #9CA3AF; }
    .arch-visual {
      background: var(--bg-dark-card);
      border: 1px solid rgba(255, 255, 255, 0.1);
      border-radius: var(--radius);
      padding: 24px;
      box-shadow: 0 12px 30px rgba(0,0,0,0.4);
    }
    .chart-bar-wrap {
      display: flex;
      flex-direction: column;
      gap: 18px;
      margin-top: 20px;
    }
    .chart-bar-item label {
      display: flex;
      justify-content: space-between;
      font-size: 13px;
      color: #D1D5DB;
      margin-bottom: 6px;
    }
    .bar-line {
      height: 8px;
      background: rgba(255, 255, 255, 0.1);
      border-radius: 4px;
      overflow: hidden;
    }
    .bar-fill {
      height: 100%;
      background: var(--primary);
      border-radius: 4px;
    }

    /* 板块 5: 热门产品与矩阵 */
    .products-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .product-card {
      background: #FFFFFF;
      border: 1px solid var(--border-light);
      border-radius: var(--radius);
      overflow: hidden;
      display: flex;
      flex-direction: column;
      transition: all 0.25s ease;
    }
    .product-card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
    }
    .prod-body {
      padding: 28px 24px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
    }
    .prod-title {
      font-size: 18px;
      font-weight: 700;
      color: var(--title-color);
      margin-bottom: 10px;
    }
    .prod-text {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 20px;
      flex-grow: 1;
    }
    .prod-meta {
      border-top: 1px solid var(--border-color);
      padding-top: 14px;
      font-size: 13px;
      color: var(--text-muted);
      display: flex;
      justify-content: space-between;
    }

    /* 板块 6: 标杆场景落地 */
    .story-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 30px;
    }
    .story-card {
      background: #FFFFFF;
      border: 1px solid var(--border-light);
      border-radius: var(--radius);
      overflow: hidden;
      display: flex;
      flex-direction: column;
    }
    .story-img-wrap {
      height: 220px;
      overflow: hidden;
    }
    .story-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }
    .story-card:hover .story-img-wrap img {
      transform: scale(1.04);
    }
    .story-content {
      padding: 28px;
    }
    .story-tag {
      font-size: 12px;
      color: var(--primary);
      font-weight: 700;
      margin-bottom: 8px;
      text-transform: uppercase;
    }
    .story-title {
      font-size: 20px;
      font-weight: 700;
      color: var(--title-color);
      margin-bottom: 12px;
    }
    .story-desc {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 20px;
    }
    .story-data-badges {
      display: flex;
      gap: 12px;
    }
    .data-pill {
      background: var(--bg-alt);
      border: 1px solid var(--border-color);
      padding: 6px 12px;
      border-radius: 4px;
      font-size: 13px;
      font-weight: 600;
      color: var(--title-color);
    }

    /* 板块 7: 成果数据条 */
    .counter-section {
      background: #0A2E2B;
      color: #FFFFFF;
      padding: 60px 0;
    }
    .counter-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      text-align: center;
    }
    .counter-num {
      font-family: var(--font-mono);
      font-size: 40px;
      font-weight: 800;
      color: var(--primary);
      line-height: 1.1;
      margin-bottom: 8px;
    }
    .counter-title {
      font-size: 15px;
      color: #E5E7EB;
      font-weight: 500;
    }

    /* 板块 8: 客户评价 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .testi-card {
      background: #FFFFFF;
      border: 1px solid var(--border-light);
      border-radius: var(--radius);
      padding: 28px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .testi-text {
      font-size: 14px;
      color: var(--text-main);
      line-height: 1.8;
      margin-bottom: 24px;
      font-style: italic;
    }
    .testi-author {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid var(--border-color);
      padding-top: 16px;
    }
    .author-avatar {
      width: 42px;
      height: 42px;
      background: var(--primary-light);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: var(--primary);
    }
    .author-name { font-size: 14px; font-weight: 700; color: var(--title-color); }
    .author-role { font-size: 12px; color: var(--text-muted); }

    /* 板块 9: 增长内嵌资讯 */
    .news-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .news-card {
      background: #FFFFFF;
      border: 1px solid var(--border-light);
      border-radius: var(--radius);
      padding: 26px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      transition: all 0.25s ease;
    }
    .news-card:hover {
      border-color: var(--primary);
      box-shadow: var(--shadow-sm);
    }
    .news-date {
      font-size: 12px;
      color: var(--primary);
      font-weight: 600;
      margin-bottom: 10px;
    }
    .news-title {
      font-size: 17px;
      font-weight: 700;
      color: var(--title-color);
      margin-bottom: 12px;
      line-height: 1.45;
    }
    .news-brief {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 20px;
    }
    .news-link-btn {
      font-size: 13px;
      font-weight: 600;
      color: var(--primary);
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

    /* 板块 10: 常见问题手风琴 */
    .faq-container {
      max-width: 860px;
      margin: 0 auto;
    }
    .faq-item {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      margin-bottom: 14px;
      overflow: hidden;
    }
    .faq-question {
      padding: 20px 24px;
      font-size: 16px;
      font-weight: 600;
      color: var(--title-color);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
    }
    .faq-question::-webkit-details-marker { display: none; }
    .faq-icon {
      font-size: 18px;
      transition: transform 0.25s ease;
      color: var(--text-muted);
    }
    details[open] .faq-icon {
      transform: rotate(180deg);
      color: var(--primary);
    }
    .faq-answer {
      padding: 0 24px 22px 24px;
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.8;
      border-top: 1px solid transparent;
    }

    /* 板块 11: 数据合规与交付保障 */
    .guarantee-bar {
      background: #FFFFFF;
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
      padding: 40px 0;
    }
    .guarantee-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .guar-item {
      display: flex;
      align-items: center;
      gap: 14px;
    }
    .guar-icon {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: var(--bg-alt);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      font-size: 18px;
      flex-shrink: 0;
    }
    .guar-title { font-size: 15px; font-weight: 700; color: var(--title-color); }
    .guar-sub { font-size: 12px; color: var(--text-muted); }

    /* 板块 12: 咨询与诊断表单 */
    .cta-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      box-shadow: var(--shadow-md);
      overflow: hidden;
      display: grid;
      grid-template-columns: 1fr 1fr;
    }
    .cta-info {
      padding: 56px 48px;
      background: var(--bg-alt);
      display: flex;
      flex-direction: column;
      justify-content: center;
    }
    .cta-info h3 {
      font-size: 28px;
      color: var(--title-color);
      margin-bottom: 16px;
      line-height: 1.3;
    }
    .cta-info p {
      font-size: 15px;
      color: var(--text-muted);
      line-height: 1.75;
      margin-bottom: 24px;
    }
    .cta-contact-item {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 14px;
      color: var(--text-main);
      margin-bottom: 12px;
    }
    .cta-form-wrap {
      padding: 56px 48px;
    }
    .form-group {
      margin-bottom: 18px;
    }
    .form-group label {
      display: block;
      font-size: 13px;
      font-weight: 600;
      color: var(--title-color);
      margin-bottom: 6px;
    }
    .form-input {
      width: 100%;
      padding: 12px 14px;
      border: 1px solid var(--border-color);
      border-radius: 4px;
      font-size: 14px;
      color: var(--text-main);
      background-color: #FAFAFA;
      transition: border-color 0.2s ease;
    }
    .form-input:focus {
      outline: none;
      border-color: var(--primary);
      background-color: #FFFFFF;
    }
    textarea.form-input {
      resize: vertical;
      min-height: 90px;
    }

    /* 页脚 */
    .site-footer {
      background: var(--bg-dark);
      color: #9CA3AF;
      font-size: 14px;
      padding: 70px 0 30px 0;
      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: 50px;
    }
    .footer-brand {
      color: #FFFFFF;
      font-size: 18px;
      font-weight: 800;
      margin-bottom: 16px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .footer-desc {
      line-height: 1.7;
      font-size: 13px;
      margin-bottom: 20px;
      max-width: 320px;
    }
    .footer-col h4 {
      color: #FFFFFF;
      font-size: 15px;
      font-weight: 700;
      margin-bottom: 18px;
    }
    .footer-links li {
      margin-bottom: 10px;
    }
    .footer-links a:hover {
      color: var(--primary);
    }
    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      padding-top: 28px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 13px;
    }

    /* 移动端与平板响应式断点 */
    @media (max-width: 1024px) {
      .hero-plans-grid,
      .products-grid,
      .testimonial-grid,
      .news-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .catalog-grid,
      .guarantee-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .architecture-box {
        grid-template-columns: 1fr;
        gap: 36px;
      }
      .cta-card {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    @media (max-width: 768px) {
      .top-bar { display: none; }
      .nav-menu {
        display: none;
        position: absolute;
        top: 74px;
        left: 0;
        width: 100%;
        background: #FFFFFF;
        flex-direction: column;
        padding: 24px;
        gap: 18px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
      }
      .nav-menu.active { display: flex; }
      .mobile-menu-btn { display: block; }
      .nav-action-btn { display: none; }
      .hero-title { font-size: 30px; }
      .hero-plans-grid,
      .value-grid,
      .products-grid,
      .story-grid,
      .counter-grid,
      .testimonial-grid,
      .news-grid,
      .catalog-grid,
      .guarantee-grid {
        grid-template-columns: 1fr;
      }
      .plan-card.featured {
        transform: none;
      }
      .cta-info, .cta-form-wrap {
        padding: 32px 24px;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .footer-bottom {
        flex-direction: column;
        gap: 12px;
        text-align: center;
      }
      .sec-title { font-size: 26px; }
    }