/* roulang page: index */
:root {
      --primary: #6366F1;
      --primary-dark: #4F46E5;
      --secondary: #3B82F6;
      --accent: #10B981;
      --warning: #F59E0B;
      --danger: #EF4444;
      --bg-light: #F8FAFC;
      --bg-white: #FFFFFF;
      --bg-dark: #0B0F19;
      --bg-dark-card: #151B2B;
      --text-main: #0F172A;
      --text-muted: #334155;
      --text-light: #64748B;
      --border-color: #E2E8F0;
      --border-dark: #1E293B;
      --radius: 12px;
      --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
      --shadow-hover: 0 20px 25px -5px rgba(99, 102, 241, 0.12), 0 10px 10px -5px rgba(99, 102, 241, 0.04);
    }

    * {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      padding: 0;
      background-color: var(--bg-light);
      color: var(--text-main);
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
      line-height: 1.8;
      letter-spacing: -0.01em;
      -webkit-font-smoothing: antialiased;
    }

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

    img {
      max-width: 100%;
      height: auto;
      border-radius: var(--radius);
      display: block;
    }

    .grid-container {
      max-width: 1200px;
    }

    /* 顶部服务信息条 */
    .top-meta-bar {
      background: #060911;
      color: #94A3B8;
      font-size: 0.825rem;
      padding: 0.45rem 0;
      border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    }
    .top-meta-bar .status-indicator {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      color: var(--accent);
    }
    .status-dot {
      width: 8px;
      height: 8px;
      background: var(--accent);
      border-radius: 50%;
      box-shadow: 0 0 8px var(--accent);
    }

    /* 居中 Logo + 两侧主导航 */
    .header-site {
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      position: sticky;
      top: 0;
      z-index: 1000;
      border-bottom: 1px solid var(--border-color);
      box-shadow: 0 2px 10px rgba(0,0,0,0.03);
    }
    .nav-split-wrapper {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 76px;
    }
    .nav-menu-side {
      display: flex;
      align-items: center;
      gap: 1.75rem;
      list-style: none;
      margin: 0;
      padding: 0;
    }
    .nav-menu-side a {
      color: var(--text-muted);
      font-weight: 500;
      font-size: 0.95rem;
      position: relative;
      padding: 6px 0;
    }
    .nav-menu-side a:hover,
    .nav-menu-side a.is-active {
      color: var(--primary);
    }
    .nav-menu-side a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.25s ease;
    }
    .nav-menu-side a:hover::after,
    .nav-menu-side a.is-active::after {
      width: 100%;
    }
    .brand-logo-center {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 1.35rem;
      font-weight: 800;
      color: var(--text-main);
      padding: 0 1rem;
    }
    .brand-logo-center i {
      color: var(--primary);
      font-size: 1.5rem;
    }
    .btn-apply-nav {
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      color: #FFF !important;
      padding: 0.55rem 1.25rem;
      border-radius: 6px;
      font-weight: 600;
      font-size: 0.9rem;
      display: inline-block;
      box-shadow: 0 4px 14px rgba(99, 102, 241, 0.3);
    }
    .btn-apply-nav:hover {
      box-shadow: 0 6px 20px rgba(99, 102, 241, 0.45);
      transform: translateY(-1px);
    }

    /* 移动端菜单按钮与抽屉 */
    .mobile-nav-trigger {
      display: none;
      font-size: 1.5rem;
      color: var(--text-main);
      background: none;
      border: none;
      cursor: pointer;
    }
    .mobile-drawer {
      display: none;
      background: #FFF;
      border-bottom: 1px solid var(--border-color);
      padding: 1rem 1.5rem;
    }
    .mobile-drawer a {
      display: block;
      padding: 0.75rem 0;
      font-size: 1rem;
      color: var(--text-muted);
      border-bottom: 1px solid #F1F5F9;
    }

    /* 板块通用规范 */
    section {
      padding: 5rem 0;
      position: relative;
    }
    .section-header {
      margin-bottom: 3.5rem;
      text-align: center;
    }
    .section-tag {
      display: inline-block;
      font-size: 0.825rem;
      font-weight: 700;
      letter-spacing: 0.05em;
      text-transform: uppercase;
      color: var(--primary);
      background: rgba(99, 102, 241, 0.08);
      padding: 0.35rem 0.85rem;
      border-radius: 50px;
      margin-bottom: 0.75rem;
    }
    .section-title {
      font-size: 2.15rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 1rem;
      line-height: 1.3;
    }
    .section-subtitle {
      font-size: 1.05rem;
      color: var(--text-light);
      max-width: 680px;
      margin: 0 auto;
      line-height: 1.75;
    }

    /* 卡片通用 */
    .feature-card {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 2.2rem 1.8rem;
      box-shadow: var(--shadow-sm);
      height: 100%;
      display: flex;
      flex-direction: column;
      transition: all 0.3s ease;
    }
    .feature-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
      border-color: rgba(99, 102, 241, 0.3);
    }
    .card-icon-box {
      width: 52px;
      height: 52px;
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.4rem;
      margin-bottom: 1.25rem;
    }

    /* 1. Hero 区 */
    .hero-section {
      background: linear-gradient(180deg, #0B0F19 0%, #111827 100%);
      color: #FFF;
      padding: 5.5rem 0 6rem 0;
      position: relative;
      overflow: hidden;
    }
    .hero-bg-overlay {
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      bottom: 0;
      opacity: 0.15;
      background-size: cover;
      background-position: center;
      mix-blend-mode: luminosity;
    }
    .hero-content {
      position: relative;
      z-index: 2;
    }
    .hero-h1 {
      font-size: 2.85rem;
      font-weight: 800;
      line-height: 1.25;
      color: #FFF;
      margin-bottom: 1.25rem;
      letter-spacing: -0.02em;
    }
    .hero-h1 span {
      background: linear-gradient(135deg, #A5B4FC, #818CF8, #38BDF8);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-desc {
      font-size: 1.1rem;
      color: #CBD5E1;
      margin-bottom: 2rem;
      line-height: 1.85;
      max-width: 620px;
    }
    .hero-badge-wrap {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: rgba(255, 255, 255, 0.08);
      border: 1px solid rgba(255, 255, 255, 0.15);
      border-radius: 50px;
      padding: 0.4rem 1rem;
      font-size: 0.85rem;
      color: #E2E8F0;
      margin-bottom: 1.5rem;
    }
    .hero-btn-group {
      display: flex;
      gap: 1rem;
      align-items: center;
      margin-bottom: 2.5rem;
    }
    .btn-hero-primary {
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      color: #FFF !important;
      padding: 0.85rem 2rem;
      border-radius: 8px;
      font-weight: 600;
      box-shadow: 0 8px 20px rgba(99, 102, 241, 0.4);
      display: inline-block;
    }
    .btn-hero-secondary {
      border: 1px solid rgba(255, 255, 255, 0.25);
      color: #FFF !important;
      padding: 0.85rem 1.8rem;
      border-radius: 8px;
      font-weight: 500;
      background: rgba(255, 255, 255, 0.05);
      display: inline-block;
    }
    .btn-hero-secondary:hover {
      background: rgba(255, 255, 255, 0.12);
    }
    .hero-features-list {
      display: flex;
      gap: 1.5rem;
      font-size: 0.875rem;
      color: #94A3B8;
      border-top: 1px solid rgba(255, 255, 255, 0.1);
      padding-top: 1.5rem;
    }
    .hero-features-list span i {
      color: var(--accent);
      margin-right: 6px;
    }
    .hero-panel-card {
      background: rgba(21, 27, 43, 0.85);
      border: 1px solid rgba(255, 255, 255, 0.12);
      border-radius: var(--radius);
      padding: 1.5rem;
      box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
      backdrop-filter: blur(16px);
    }
    .panel-header-dot {
      display: flex;
      gap: 6px;
      margin-bottom: 1.25rem;
    }
    .panel-header-dot span {
      width: 10px;
      height: 10px;
      border-radius: 50%;
      background: #334155;
    }

    /* 2. 痛点剖析区 */
    .pain-card {
      background: #FFF;
      border: 1px solid #FEE2E2;
      border-top: 4px solid var(--danger);
      border-radius: var(--radius);
      padding: 2rem 1.75rem;
      height: 100%;
    }
    .pain-card .pain-tag {
      color: var(--danger);
      font-weight: 700;
      font-size: 0.85rem;
      display: flex;
      align-items: center;
      gap: 6px;
      margin-bottom: 0.75rem;
    }
    .pain-card h4 {
      font-size: 1.25rem;
      font-weight: 700;
      margin-bottom: 0.85rem;
      color: var(--text-main);
    }
    .pain-card p {
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 3. 核心架构区 */
    .tech-metric-pill {
      display: inline-flex;
      align-items: center;
      gap: 12px;
      background: #EEF2FF;
      border: 1px solid #C7D2FE;
      padding: 0.65rem 1.25rem;
      border-radius: 8px;
      margin-bottom: 1rem;
    }
    .tech-metric-pill strong {
      font-size: 1.35rem;
      color: var(--primary);
    }

    /* 5. 热门场景产品 */
    .product-scenario-card {
      background: #FFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      overflow: hidden;
      display: flex;
      flex-direction: column;
      height: 100%;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
    }
    .product-scenario-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .product-img-wrap {
      height: 200px;
      overflow: hidden;
      position: relative;
    }
    .product-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      border-radius: 0;
      transition: transform 0.4s ease;
    }
    .product-scenario-card:hover .product-img-wrap img {
      transform: scale(1.05);
    }
    .product-body {
      padding: 1.75rem;
      display: flex;
      flex-direction: column;
      flex-grow: 1;
    }
    .product-badge {
      font-size: 0.75rem;
      font-weight: 700;
      padding: 0.25rem 0.65rem;
      background: rgba(99, 102, 241, 0.1);
      color: var(--primary);
      border-radius: 4px;
      display: inline-block;
      margin-bottom: 0.75rem;
      align-self: flex-start;
    }
    .product-features-ul {
      list-style: none;
      padding: 0;
      margin: 1.25rem 0;
      font-size: 0.9rem;
      color: var(--text-muted);
    }
    .product-features-ul li {
      margin-bottom: 0.5rem;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .product-features-ul li i {
      color: var(--accent);
      font-size: 0.8rem;
    }

    /* 6. 方法步骤时间轴 */
    .step-box {
      position: relative;
      background: #FFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 1.75rem;
      height: 100%;
    }
    .step-number {
      width: 42px;
      height: 42px;
      background: var(--primary);
      color: #FFF;
      font-weight: 800;
      font-size: 1.15rem;
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 1rem;
    }

    /* 7. 深色理念架构区 */
    .dark-engine-section {
      background: var(--bg-dark);
      color: #F8FAFC;
    }
    .dark-console-card {
      background: var(--bg-dark-card);
      border: 1px solid var(--border-dark);
      border-radius: var(--radius);
      padding: 2rem;
    }
    .code-view {
      font-family: Consolas, Monaco, monospace;
      font-size: 0.85rem;
      color: #38BDF8;
      background: #060911;
      border-radius: 8px;
      padding: 1.25rem;
      line-height: 1.6;
      border: 1px solid #1E293B;
      overflow-x: auto;
    }

    /* 8. 成果数据统计条 */
    .stat-banner-box {
      background: linear-gradient(135deg, #1E1B4B 0%, #0F172A 100%);
      border-radius: var(--radius);
      padding: 3rem 2rem;
      color: #FFF;
      border: 1px solid rgba(255,255,255,0.08);
    }
    .stat-item {
      text-align: center;
      border-right: 1px solid rgba(255, 255, 255, 0.12);
      padding: 0 1rem;
    }
    .stat-item:last-child {
      border-right: none;
    }
    .stat-number {
      font-size: 2.6rem;
      font-weight: 800;
      color: #38BDF8;
      line-height: 1.1;
      margin-bottom: 0.4rem;
    }
    .stat-label {
      font-size: 0.95rem;
      color: #94A3B8;
    }

    /* 9. 案例对比 */
    .story-card {
      background: #FFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 2.2rem;
      height: 100%;
    }
    .metric-compare-table {
      width: 100%;
      margin-top: 1.25rem;
      border-collapse: collapse;
      font-size: 0.875rem;
    }
    .metric-compare-table th,
    .metric-compare-table td {
      padding: 0.6rem 0.75rem;
      border-bottom: 1px solid #F1F5F9;
      text-align: left;
    }
    .metric-compare-table th {
      color: var(--text-light);
      font-weight: 600;
    }
    .metric-compare-table .val-highlight {
      color: var(--accent);
      font-weight: 700;
    }

    /* 10. 用户证言 */
    .testimonial-card {
      background: #FFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 2rem;
      height: 100%;
      position: relative;
    }
    .quote-icon {
      font-size: 1.8rem;
      color: #C7D2FE;
      margin-bottom: 0.75rem;
    }
    .testimonial-user {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-top: 1.5rem;
      border-top: 1px solid #F1F5F9;
      padding-top: 1.25rem;
    }
    .user-avatar-circle {
      width: 44px;
      height: 44px;
      background: #EEF2FF;
      color: var(--primary);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
    }

    /* 11. 资讯动态 */
    .news-card {
      background: #FFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 1.75rem;
      height: 100%;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .news-meta {
      font-size: 0.8rem;
      color: var(--text-light);
      margin-bottom: 0.6rem;
      display: flex;
      justify-content: space-between;
    }

    /* 12. FAQ & CTA */
    .faq-accordion-item {
      background: #FFF;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      margin-bottom: 1rem;
      overflow: hidden;
    }
    .faq-title-btn {
      width: 100%;
      text-align: left;
      padding: 1.25rem 1.5rem;
      background: none;
      border: none;
      font-size: 1.05rem;
      font-weight: 600;
      color: var(--text-main);
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      outline: none;
    }
    .faq-title-btn:hover {
      background: #F8FAFC;
    }
    .faq-content-box {
      padding: 0 1.5rem 1.25rem 1.5rem;
      font-size: 0.95rem;
      color: var(--text-muted);
      border-top: 1px solid transparent;
      display: block;
    }
    .cta-banner-card {
      background: linear-gradient(135deg, #4F46E5 0%, #3B82F6 100%);
      color: #FFF;
      border-radius: var(--radius);
      padding: 3.5rem 2.5rem;
      margin-top: 3.5rem;
      box-shadow: 0 20px 40px rgba(99, 102, 241, 0.25);
    }
    .cta-form-input {
      border: 1px solid rgba(255, 255, 255, 0.3) !important;
      background: rgba(255, 255, 255, 0.15) !important;
      color: #FFF !important;
      border-radius: 6px !important;
      padding: 0.75rem 1rem !important;
      height: 48px !important;
      margin-bottom: 0 !important;
    }
    .cta-form-input::placeholder {
      color: rgba(255, 255, 255, 0.7);
    }
    .cta-form-input:focus {
      border-color: #FFF !important;
      box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.25) !important;
    }
    .cta-submit-btn {
      background: #10B981 !important;
      color: #FFF !important;
      font-weight: 700 !important;
      height: 48px !important;
      border-radius: 6px !important;
      border: none !important;
      cursor: pointer !important;
      padding: 0 1.75rem !important;
      box-shadow: 0 4px 12px rgba(16, 185, 129, 0.35);
    }
    .cta-submit-btn:hover {
      background: #059669 !important;
    }

    /* 页脚 Footer */
    .site-footer {
      background: #060911;
      color: #94A3B8;
      padding: 4.5rem 0 2rem 0;
      border-top: 1px solid #1E293B;
      font-size: 0.9rem;
    }
    .footer-col h5 {
      color: #FFF;
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 1.25rem;
    }
    .footer-links-list {
      list-style: none;
      padding: 0;
      margin: 0;
    }
    .footer-links-list li {
      margin-bottom: 0.65rem;
    }
    .footer-links-list a {
      color: #94A3B8;
    }
    .footer-links-list a:hover {
      color: #FFF;
    }
    .footer-bottom-line {
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      margin-top: 3.5rem;
      padding-top: 1.75rem;
      font-size: 0.825rem;
      display: flex;
      flex-wrap: wrap;
      justify-content: space-between;
      gap: 1rem;
      align-items: center;
    }

    /* 响应式调整 */
    @media (max-width: 1024px) {
      .nav-menu-side {
        display: none;
      }
      .mobile-nav-trigger {
        display: block;
      }
      .hero-h1 {
        font-size: 2.25rem;
      }
      .stat-item {
        border-right: none;
        margin-bottom: 1.5rem;
      }
    }
    @media (max-width: 640px) {
      .hero-h1 {
        font-size: 1.85rem;
      }
      .hero-btn-group {
        flex-direction: column;
        align-items: stretch;
      }
      .hero-features-list {
        flex-direction: column;
        gap: 0.75rem;
      }
      .cta-banner-card {
        padding: 2rem 1.25rem;
      }
    }