/* roulang page: index */
:root {
      --bg-primary: #0B0E14;
      --bg-surface: #151922;
      --bg-card: #1A1F2C;
      --primary-cyan: #00F2FE;
      --accent-purple: #7F00FF;
      --accent-blue: #4FACFE;
      --text-main: #F0F4F8;
      --text-muted: #94A3B8;
      --text-dim: #64748B;
      --border-light: rgba(255, 255, 255, 0.08);
      --glow-cyan: rgba(0, 242, 254, 0.18);
      --font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
    }

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

    body {
      background-color: var(--bg-primary);
      color: var(--text-main);
      font-family: var(--font-family);
      line-height: 1.65;
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
    }

    a {
      color: var(--primary-cyan);
      text-decoration: none;
      transition: all 0.25s ease;
    }
    a:hover {
      color: #80f9ff;
    }

    /* 顶行服务背书条 */
    .top-bar {
      background: #06080C;
      border-bottom: 1px solid var(--border-light);
      font-size: 13px;
      color: var(--text-dim);
      padding: 8px 0;
    }
    .top-bar a {
      color: var(--text-dim);
    }
    .top-bar a:hover {
      color: var(--primary-cyan);
    }

    /* 主导航栏 (居中 Logo + 两侧导航) */
    .site-nav {
      background: rgba(11, 14, 20, 0.92);
      backdrop-filter: blur(16px);
      border-bottom: 1px solid var(--border-light);
      position: sticky;
      top: 0;
      z-index: 1030;
      padding: 12px 0;
    }
    .nav-logo-text {
      font-size: 22px;
      font-weight: 800;
      letter-spacing: -0.5px;
      background: linear-gradient(135deg, #ffffff 30%, var(--primary-cyan) 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .nav-logo-text i {
      color: var(--primary-cyan);
      -webkit-text-fill-color: initial;
    }
    .nav-link-custom {
      color: var(--text-muted);
      font-size: 15px;
      font-weight: 500;
      padding: 8px 16px;
      border-radius: 6px;
      display: inline-block;
      transition: all 0.2s ease;
    }
    .nav-link-custom:hover {
      color: #ffffff;
      background: rgba(255, 255, 255, 0.05);
    }
    .btn-portal-action {
      background: linear-gradient(135deg, var(--primary-cyan), var(--accent-blue));
      color: #06080C !important;
      font-weight: 700;
      font-size: 14px;
      padding: 8px 20px;
      border-radius: 20px;
      border: none;
      box-shadow: 0 0 15px var(--glow-cyan);
      transition: transform 0.2s, box-shadow 0.2s;
    }
    .btn-portal-action:hover {
      transform: translateY(-2px);
      box-shadow: 0 0 25px rgba(0, 242, 254, 0.4);
    }

    /* 板块通用间距与标题 */
    section {
      padding: 90px 0;
      position: relative;
    }
    .section-tag {
      font-size: 13px;
      text-transform: uppercase;
      letter-spacing: 2px;
      color: var(--primary-cyan);
      background: rgba(0, 242, 254, 0.08);
      border: 1px solid rgba(0, 242, 254, 0.2);
      padding: 4px 14px;
      border-radius: 20px;
      display: inline-block;
      margin-bottom: 14px;
      font-weight: 600;
    }
    .section-title {
      font-size: 34px;
      font-weight: 800;
      color: #FFFFFF;
      line-height: 1.3;
      margin-bottom: 16px;
    }
    .section-subtitle {
      font-size: 16px;
      color: var(--text-muted);
      max-width: 680px;
      margin: 0 auto;
      line-height: 1.7;
    }

    /* 卡片体系 */
    .data-card {
      background: var(--bg-surface);
      border: 1px solid var(--border-light);
      border-radius: 12px;
      padding: 32px 28px;
      height: 100%;
      position: relative;
      transition: transform 0.3s cubic-bezier(0.165, 0.84, 0.44, 1), box-shadow 0.3s, border-color 0.3s;
    }
    .data-card:hover {
      transform: translateY(-6px);
      border-color: rgba(0, 242, 254, 0.4);
      box-shadow: 0 12px 32px var(--glow-cyan);
    }
    .data-card-icon {
      width: 54px;
      height: 54px;
      border-radius: 10px;
      background: linear-gradient(135deg, rgba(0, 242, 254, 0.1), rgba(127, 0, 255, 0.15));
      border: 1px solid rgba(0, 242, 254, 0.25);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 22px;
      color: var(--primary-cyan);
      margin-bottom: 22px;
    }

    /* 1. Hero 资源搜索与分类入口 */
    #sec-hero {
      background: linear-gradient(180deg, rgba(11, 14, 20, 0.75) 0%, rgba(11, 14, 20, 0.95) 100%),
                  url('/assets/images/f45562c151d20bf5.jpg') center/cover no-repeat;
      padding: 130px 0 100px;
      border-bottom: 1px solid var(--border-light);
    }
    .hero-search-box {
      background: rgba(21, 25, 34, 0.85);
      backdrop-filter: blur(12px);
      border: 1px solid rgba(0, 242, 254, 0.3);
      border-radius: 40px;
      padding: 8px 10px 8px 24px;
      box-shadow: 0 8px 30px rgba(0, 0, 0, 0.6);
      max-width: 680px;
      margin: 36px auto 28px;
      display: flex;
      align-items: center;
    }
    .hero-search-input {
      background: transparent;
      border: none;
      color: #fff;
      font-size: 16px;
      width: 100%;
      outline: none;
    }
    .hero-search-input::placeholder {
      color: var(--text-dim);
    }
    .hero-quick-tag {
      font-size: 13px;
      color: var(--text-muted);
      background: rgba(255, 255, 255, 0.05);
      padding: 5px 14px;
      border-radius: 20px;
      border: 1px solid var(--border-light);
      margin: 4px;
      display: inline-block;
      transition: all 0.2s;
    }
    .hero-quick-tag:hover {
      color: var(--primary-cyan);
      border-color: var(--primary-cyan);
      background: rgba(0, 242, 254, 0.08);
    }

    /* 2. 机制与痛点解构 */
    #sec-intro {
      background: #0B0E14;
    }
    .intro-param-pill {
      background: rgba(127, 0, 255, 0.15);
      border-left: 3px solid var(--accent-purple);
      padding: 14px 20px;
      border-radius: 0 8px 8px 0;
      margin-top: 24px;
    }

    /* 3. 核心优势六宫格 */
    #sec-advantages {
      background: #10141C;
    }

    /* 4. 核心产品套件区 */
    #sec-products {
      background: #0B0E14;
    }
    .product-badge {
      font-size: 11px;
      padding: 4px 10px;
      border-radius: 4px;
      background: rgba(0, 242, 254, 0.15);
      color: var(--primary-cyan);
      font-weight: 600;
    }

    /* 5. 深色案例与代码技术底座 */
    #sec-deep-cases {
      background: #07090D;
      border-top: 1px solid var(--border-light);
      border-bottom: 1px solid var(--border-light);
    }
    .code-mockup {
      background: #11141B;
      border: 1px solid rgba(255, 255, 255, 0.08);
      border-radius: 10px;
      padding: 20px;
      font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
      font-size: 13px;
      color: #A5B4FC;
    }

    /* 6. 适用人群与场景 */
    #sec-audience {
      background: #0E121A;
    }

    /* 7. 客户故事与标杆案例 */
    #sec-stories {
      background: #0B0E14;
    }
    .story-card-img {
      height: 220px;
      object-fit: cover;
      border-radius: 8px;
      width: 100%;
      margin-bottom: 18px;
    }

    /* 8. 成果数据统计条 */
    #sec-metrics {
      background: linear-gradient(90deg, #10141E 0%, #151A26 50%, #10141E 100%);
      border-top: 1px solid rgba(0, 242, 254, 0.2);
      border-bottom: 1px solid rgba(0, 242, 254, 0.2);
      padding: 60px 0;
    }
    .metric-number {
      font-size: 46px;
      font-weight: 900;
      color: var(--primary-cyan);
      line-height: 1.1;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    }

    /* 9. 客户证言区 */
    #sec-testimonials {
      background: #0B0E14;
    }
    .quote-box {
      font-style: italic;
      color: var(--text-muted);
      position: relative;
      margin-bottom: 20px;
      font-size: 15px;
    }

    /* 10. 前沿资讯与模型更新 */
    #sec-news {
      background: #10141C;
    }
    .news-meta {
      font-size: 12px;
      color: var(--text-dim);
      margin-bottom: 8px;
    }

    /* 11. FAQ 手风琴 */
    #sec-faq {
      background: #0B0E14;
    }
    .accordion-item {
      background-color: var(--bg-surface);
      border: 1px solid var(--border-light);
      margin-bottom: 14px;
      border-radius: 8px !important;
      overflow: hidden;
    }
    .accordion-button {
      background-color: var(--bg-surface);
      color: #ffffff;
      font-size: 16px;
      font-weight: 600;
      padding: 20px 24px;
      box-shadow: none !important;
    }
    .accordion-button:not(.collapsed) {
      background-color: #1A1F2C;
      color: var(--primary-cyan);
      border-left: 4px solid var(--primary-cyan);
    }
    .accordion-button::after {
      filter: invert(1);
    }
    .accordion-body {
      background-color: #1A1F2C;
      color: var(--text-muted);
      font-size: 15px;
      line-height: 1.7;
      padding: 20px 24px;
    }

    /* 12. 转化激发区 */
    #sec-cta {
      background: radial-gradient(circle at 50% 20%, rgba(0, 242, 254, 0.12) 0%, rgba(11, 14, 20, 1) 70%), #0B0E14;
      border-top: 1px solid var(--border-light);
      padding: 100px 0;
    }
    .cta-card-wrapper {
      background: linear-gradient(135deg, rgba(21, 25, 34, 0.95), rgba(26, 31, 44, 0.95));
      border: 1px solid rgba(0, 242, 254, 0.3);
      border-radius: 16px;
      padding: 50px 30px;
      box-shadow: 0 20px 50px rgba(0, 0, 0, 0.6);
    }

    /* 页脚 */
    footer {
      background: #05070B;
      border-top: 1px solid var(--border-light);
      padding: 70px 0 30px;
      font-size: 14px;
      color: var(--text-dim);
    }
    .footer-heading {
      color: #ffffff;
      font-weight: 700;
      margin-bottom: 20px;
      font-size: 16px;
    }
    .footer-link-list {
      list-style: none;
      padding: 0;
      margin: 0;
    }
    .footer-link-list li {
      margin-bottom: 12px;
    }
    .footer-link-list a {
      color: var(--text-muted);
    }
    .footer-link-list a:hover {
      color: var(--primary-cyan);
    }

    @media (max-width: 991px) {
      .section-title {
        font-size: 28px;
      }
      .nav-links-left, .nav-links-right {
        text-align: center;
        margin: 10px 0;
      }
      .hero-search-box {
        margin: 24px 10px;
      }
    }