/* roulang page: index */
:root {
      --primary: #0A4FD5;
      --primary-hover: #083eb0;
      --secondary: #00A896;
      --accent-dark: #0F172A;
      --text-main: #1E293B;
      --text-muted: #475569;
      --text-light: #94A3B8;
      --bg-light: #F8FAFC;
      --bg-white: #FFFFFF;
      --border-color: rgba(226, 232, 240, 0.85);
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 16px;
      --shadow-sm: 0 4px 20px -2px rgba(10, 79, 213, 0.06);
      --shadow-hover: 0 16px 32px -4px rgba(10, 79, 213, 0.12);
      --font-stack: -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    }

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

    body {
      font-family: var(--font-stack);
      color: var(--text-main);
      background-color: var(--bg-light);
      line-height: 1.75;
      font-size: 15px;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }

    a {
      color: var(--primary);
      text-decoration: none;
      transition: all 0.25s ease;
    }
    a:hover, a:focus {
      color: var(--primary-hover);
    }

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

    /* 顶部微型辅助条 */
    .top-utility-bar {
      background-color: #F1F5F9;
      border-bottom: 1px solid var(--border-color);
      font-size: 13px;
      color: var(--text-muted);
      padding: 6px 0;
    }
    .top-utility-bar .utility-content {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .top-utility-bar .lang-capsule {
      display: inline-flex;
      background: #E2E8F0;
      border-radius: 20px;
      padding: 2px 4px;
      font-size: 12px;
      font-weight: 600;
    }
    .top-utility-bar .lang-capsule span {
      padding: 2px 8px;
      border-radius: 12px;
      cursor: pointer;
    }
    .top-utility-bar .lang-capsule .active {
      background: var(--bg-white);
      color: var(--primary);
      box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    }

    /* 主导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: 0 2px 10px rgba(0,0,0,0.02);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .nav-brand {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 20px;
      font-weight: 700;
      color: var(--accent-dark);
    }
    .nav-brand .brand-badge {
      width: 40px;
      height: 40px;
      border-radius: var(--radius-sm);
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 20px;
      box-shadow: 0 4px 12px rgba(10, 79, 213, 0.25);
    }
    .main-nav {
      display: flex;
      gap: 28px;
      align-items: center;
      list-style: none;
      margin: 0;
    }
    .main-nav li a {
      color: var(--text-muted);
      font-weight: 500;
      font-size: 15px;
      position: relative;
      padding: 6px 0;
    }
    .main-nav li a:hover,
    .main-nav li a.active {
      color: var(--primary);
    }
    .main-nav li a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.25s ease;
    }
    .main-nav li a:hover::after {
      width: 100%;
    }

    /* 按钮规范 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 12px 24px;
      font-size: 15px;
      font-weight: 600;
      border-radius: var(--radius-sm);
      transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
      cursor: pointer;
      border: 1px solid transparent;
      min-height: 44px;
    }
    .btn-primary {
      background-color: var(--primary);
      color: #FFFFFF;
      box-shadow: 0 4px 14px rgba(10, 79, 213, 0.25);
    }
    .btn-primary:hover {
      background-color: var(--primary-hover);
      color: #FFFFFF;
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(10, 79, 213, 0.35);
    }
    .btn-outline {
      background-color: transparent;
      color: var(--primary);
      border-color: var(--primary);
    }
    .btn-outline:hover {
      background-color: rgba(10, 79, 213, 0.05);
      color: var(--primary-hover);
      transform: translateY(-2px);
    }
    .btn-light {
      background: #FFFFFF;
      color: var(--accent-dark);
      border-color: var(--border-color);
    }
    .btn-light:hover {
      background: #F1F5F9;
      color: var(--primary);
      transform: translateY(-2px);
    }

    /* 通用板块与排版 */
    .section-spacing {
      padding: clamp(64px, 7vw, 100px) 0;
      position: relative;
    }
    .bg-white-pure {
      background-color: var(--bg-white);
    }
    .bg-light-soft {
      background-color: var(--bg-light);
    }
    .bg-dark-pro {
      background-color: var(--accent-dark);
      color: #E2E8F0;
    }
    .bg-dark-pro h2, .bg-dark-pro h3, .bg-dark-pro p {
      color: #F8FAFC;
    }

    .section-header {
      margin-bottom: 48px;
    }
    .section-header.text-center {
      text-align: center;
    }
    .badge-pill {
      display: inline-block;
      padding: 6px 14px;
      font-size: 13px;
      font-weight: 600;
      border-radius: 30px;
      background-color: rgba(10, 79, 213, 0.1);
      color: var(--primary);
      margin-bottom: 12px;
      letter-spacing: 0.5px;
    }
    .bg-dark-pro .badge-pill {
      background-color: rgba(0, 168, 150, 0.2);
      color: #2DD4BF;
    }
    .section-title {
      font-size: clamp(26px, 3.2vw, 38px);
      font-weight: 700;
      line-height: 1.3;
      margin-bottom: 16px;
      color: var(--accent-dark);
    }
    .bg-dark-pro .section-title {
      color: #FFFFFF;
    }
    .section-subtitle {
      font-size: 16px;
      color: var(--text-muted);
      max-width: 780px;
      margin: 0 auto;
      line-height: 1.8;
    }
    .bg-dark-pro .section-subtitle {
      color: #94A3B8;
    }

    /* 卡片系统 */
    .pro-card {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
      height: 100%;
      display: flex;
      flex-direction: column;
    }
    .pro-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
      border-color: rgba(10, 79, 213, 0.3);
    }

    /* 首屏 Hero: 品牌旗舰店叠加大图与系列导航条 */
    .hero-flagship {
      position: relative;
      background: linear-gradient(180deg, #FFFFFF 0%, #EFF6FF 100%);
      padding: 40px 0 80px 0;
      overflow: hidden;
    }
    .hero-banner-box {
      position: relative;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: 0 20px 40px -10px rgba(10, 79, 213, 0.15);
      border: 1px solid rgba(226, 232, 240, 0.8);
      background-color: #0F172A;
    }
    .hero-banner-box .hero-bg-img {
      width: 100%;
      height: clamp(480px, 60vh, 600px);
      object-fit: cover;
      opacity: 0.35;
      filter: saturate(1.2);
    }
    .hero-overlay-content {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      padding: clamp(24px, 5vw, 60px);
      z-index: 2;
    }
    .hero-series-bar {
      display: inline-flex;
      background: rgba(15, 23, 42, 0.75);
      backdrop-filter: blur(8px);
      padding: 6px 16px;
      border-radius: 40px;
      border: 1px solid rgba(255, 255, 255, 0.2);
      gap: 20px;
      align-items: center;
      max-width: fit-content;
    }
    .hero-series-bar span {
      color: #E2E8F0;
      font-size: 13px;
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }
    .hero-series-bar span i {
      color: var(--secondary);
    }
    .hero-core-title {
      max-width: 820px;
    }
    .hero-core-title h1 {
      font-size: clamp(32px, 4.2vw, 50px);
      font-weight: 800;
      line-height: 1.25;
      color: #FFFFFF;
      margin-bottom: 20px;
      text-shadow: 0 2px 10px rgba(0,0,0,0.5);
    }
    .hero-core-title p {
      font-size: clamp(15px, 1.8vw, 17px);
      line-height: 1.8;
      color: #CBD5E1;
      margin-bottom: 28px;
      text-shadow: 0 1px 4px rgba(0,0,0,0.4);
    }
    .hero-action-group {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      align-items: center;
    }
    .hero-metrics-ticker {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
      gap: 16px;
      margin-top: 32px;
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 20px 24px;
      box-shadow: var(--shadow-sm);
    }
    .ticker-item {
      display: flex;
      align-items: center;
      gap: 14px;
    }
    .ticker-item i {
      font-size: 24px;
      color: var(--primary);
    }
    .ticker-item .num {
      font-size: 20px;
      font-weight: 700;
      color: var(--accent-dark);
      display: block;
      line-height: 1.2;
    }
    .ticker-item .label {
      font-size: 13px;
      color: var(--text-muted);
    }

    /* 板块一：全生命周期服务矩阵 */
    .arch-spec-box {
      background: #F1F5F9;
      border-radius: var(--radius-md);
      padding: 24px;
      border-left: 4px solid var(--primary);
      margin-top: 24px;
    }
    .arch-spec-box ul {
      margin: 0;
      list-style: none;
    }
    .arch-spec-box li {
      margin-bottom: 10px;
      font-size: 14px;
      color: var(--text-main);
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .arch-spec-box li:last-child {
      margin-bottom: 0;
    }
    .arch-spec-box li i {
      color: var(--secondary);
    }

    /* 板块三：热门引擎方案卡片对比 */
    .engine-card {
      position: relative;
      overflow: hidden;
    }
    .engine-card.featured {
      border: 2px solid var(--primary);
    }
    .engine-badge-tag {
      position: absolute;
      top: 18px;
      right: 18px;
      background: rgba(10, 79, 213, 0.1);
      color: var(--primary);
      font-size: 12px;
      font-weight: 700;
      padding: 4px 10px;
      border-radius: 4px;
    }
    .engine-card .param-list {
      list-style: none;
      margin: 20px 0;
      border-top: 1px dashed var(--border-color);
      padding-top: 16px;
    }
    .engine-card .param-list li {
      display: flex;
      justify-content: space-between;
      font-size: 14px;
      padding: 6px 0;
      color: var(--text-muted);
    }
    .engine-card .param-list li span:last-child {
      font-weight: 600;
      color: var(--accent-dark);
    }

    /* 板块四：深色底层技术架构 */
    .pipeline-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
      gap: 20px;
      margin-top: 36px;
    }
    .pipeline-node {
      background: rgba(255, 255, 255, 0.05);
      border: 1px solid rgba(255, 255, 255, 0.12);
      border-radius: var(--radius-md);
      padding: 24px;
      position: relative;
    }
    .pipeline-node h4 {
      color: #38BDF8;
      font-size: 18px;
      margin-bottom: 12px;
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .pipeline-node p {
      font-size: 14px;
      color: #94A3B8;
      line-height: 1.7;
      margin: 0;
    }

    /* 板块五：落地步骤推进流 */
    .step-flow {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
      gap: 24px;
      position: relative;
    }
    .step-card {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px;
      position: relative;
    }
    .step-num {
      width: 36px;
      height: 36px;
      background: var(--primary);
      color: #fff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 16px;
      margin-bottom: 16px;
    }

    /* 板块七：关键数据统计带 */
    .stat-banner {
      background: linear-gradient(135deg, #0A4FD5 0%, #0088A3 100%);
      color: #FFFFFF;
      padding: 56px 0;
    }
    .stat-banner .stat-num {
      font-size: clamp(36px, 4vw, 52px);
      font-weight: 800;
      line-height: 1.1;
      margin-bottom: 8px;
    }
    .stat-banner .stat-desc {
      font-size: 15px;
      opacity: 0.9;
    }

    /* 板块十：合作伙伴灰度Logo */
    .partner-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
      gap: 20px;
      align-items: center;
    }
    .partner-box {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      height: 84px;
      display: flex;
      align-items: center;
      justify-content: center;
      padding: 16px;
      font-weight: 600;
      color: #64748B;
      filter: grayscale(100%);
      opacity: 0.7;
      transition: all 0.3s ease;
    }
    .partner-box:hover {
      filter: grayscale(0%);
      opacity: 1;
      border-color: var(--primary);
      color: var(--primary);
      box-shadow: var(--shadow-sm);
    }

    /* 板块十一：FAQ 手风琴定制 */
    .faq-container {
      max-width: 860px;
      margin: 0 auto;
    }
    .custom-accordion {
      list-style: none;
      margin: 0;
    }
    .custom-accordion-item {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      margin-bottom: 14px;
      overflow: hidden;
      transition: all 0.25s ease;
    }
    .custom-accordion-title {
      padding: 20px 24px;
      font-size: 16px;
      font-weight: 600;
      color: var(--accent-dark);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
    }
    .custom-accordion-title:hover {
      background-color: #F8FAFC;
    }
    .custom-accordion-content {
      padding: 0 24px 20px 24px;
      font-size: 15px;
      color: var(--text-muted);
      line-height: 1.8;
      border-top: 1px dashed var(--border-color);
      padding-top: 16px;
    }

    /* 板块十二：收口转化表单与承诺 */
    .lead-box {
      background: linear-gradient(135deg, #0F172A 0%, #1E3A8A 100%);
      border-radius: var(--radius-lg);
      padding: clamp(36px, 5vw, 64px);
      color: #FFFFFF;
      box-shadow: 0 20px 40px rgba(15, 23, 42, 0.25);
    }
    .lead-box h3 {
      font-size: clamp(24px, 3vw, 34px);
      font-weight: 700;
      color: #FFFFFF;
      margin-bottom: 12px;
    }
    .lead-box p {
      color: #94A3B8;
      margin-bottom: 32px;
    }
    .lead-form-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)) 160px;
      gap: 16px;
      align-items: center;
    }
    .lead-form-grid input, .lead-form-grid select {
      height: 48px;
      border-radius: var(--radius-sm);
      border: 1px solid rgba(255, 255, 255, 0.2);
      background: rgba(255, 255, 255, 0.08);
      color: #FFFFFF;
      padding: 0 16px;
      margin-bottom: 0;
      font-size: 14px;
    }
    .lead-form-grid input::placeholder {
      color: #94A3B8;
    }
    .lead-form-grid input:focus, .lead-form-grid select:focus {
      background: rgba(255, 255, 255, 0.15);
      border-color: #38BDF8;
      outline: none;
      box-shadow: 0 0 0 2px rgba(56, 189, 248, 0.3);
    }
    .lead-form-grid select option {
      color: #000;
      background: #FFF;
    }
    .guarantee-badges {
      display: flex;
      flex-wrap: wrap;
      gap: 24px;
      margin-top: 32px;
      padding-top: 24px;
      border-top: 1px solid rgba(255, 255, 255, 0.1);
    }
    .guarantee-item {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 14px;
      color: #CBD5E1;
    }
    .guarantee-item i {
      color: #2DD4BF;
    }

    /* 统一页脚 */
    .site-footer {
      background-color: #0B1120;
      color: #94A3B8;
      padding: 64px 0 28px 0;
      font-size: 14px;
      border-top: 1px solid #1E293B;
    }
    .footer-title {
      color: #FFFFFF;
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 20px;
    }
    .footer-links {
      list-style: none;
      margin: 0;
    }
    .footer-links li {
      margin-bottom: 12px;
    }
    .footer-links a {
      color: #94A3B8;
    }
    .footer-links a:hover {
      color: #FFFFFF;
    }
    .footer-bottom {
      margin-top: 48px;
      padding-top: 24px;
      border-top: 1px solid #1E293B;
      text-align: center;
      font-size: 13px;
      color: #64748B;
    }

    /* 响应式断点优化 */
    @media screen and (max-width: 1024px) {
      .main-nav {
        gap: 16px;
      }
      .lead-form-grid {
        grid-template-columns: 1fr;
      }
    }
    @media screen and (max-width: 768px) {
      .site-header .main-nav {
        display: none; /* 移动端精简模式 */
      }
      .hero-series-bar {
        display: none;
      }
      .hero-banner-box .hero-bg-img {
        height: 480px;
      }
      .ticker-item {
        border-bottom: 1px solid var(--border-color);
        padding-bottom: 12px;
      }
      .ticker-item:last-child {
        border-bottom: none;
      }
    }