/* roulang page: index */
:root {
      --primary-color: #10B981;
      --primary-neon: #CCFF00;
      --primary-dark: #059669;
      --dark-slate: #0F172A;
      --graphite: #1E293B;
      --pitch-black: #0A0E17;
      --accent-orange: #FF6B00;
      --bg-light: #F8FAFC;
      --bg-slate: #F1F5F9;
      --text-main: #0F172A;
      --text-muted: #64748B;
      --border-color: #E2E8F0;
      --border-dark: #334155;
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 20px;
      --shadow-subtle: 0 8px 30px rgba(15, 23, 42, 0.06);
      --shadow-hover: 0 16px 40px rgba(16, 185, 129, 0.15);
      --font-mono: "JetBrains Mono", "Roboto Mono", monospace;
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "HarmonyOS Sans", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-light);
      color: var(--text-main);
      line-height: 1.65;
      overflow-x: hidden;
    }

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

    /* 顶部微型状态条 */
    .top-meta-bar {
      background-color: var(--pitch-black);
      color: #94A3B8;
      font-size: 0.8125rem;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
      padding: 6px 0;
    }
    .top-meta-bar .status-dot {
      display: inline-block;
      width: 7px;
      height: 7px;
      background-color: var(--primary-neon);
      border-radius: 50%;
      box-shadow: 0 0 8px var(--primary-neon);
      margin-right: 6px;
    }

    /* 主导航 */
    .site-nav {
      background: rgba(15, 23, 42, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
      position: sticky;
      top: 0;
      z-index: 1000;
      transition: background 0.3s;
    }
    .brand-logo {
      font-size: 1.35rem;
      font-weight: 800;
      color: #FFFFFF;
      letter-spacing: -0.5px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .brand-logo i {
      color: var(--primary-neon);
      font-size: 1.5rem;
    }
    .brand-logo span {
      background: linear-gradient(135deg, #FFFFFF 60%, var(--primary-neon));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .navbar-dark .navbar-nav .nav-link {
      color: #CBD5E1;
      font-weight: 500;
      font-size: 0.9375rem;
      padding: 0.75rem 1rem;
      transition: color 0.2s ease;
    }
    .navbar-dark .navbar-nav .nav-link:hover,
    .navbar-dark .navbar-nav .nav-link:focus {
      color: var(--primary-neon);
    }
    .mega-trigger-card {
      background-color: var(--graphite);
      border: 1px solid var(--border-dark);
      border-radius: var(--radius-sm);
      padding: 8px 12px;
      color: #E2E8F0;
      font-size: 0.875rem;
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }
    .mega-trigger-card:hover {
      border-color: var(--primary-color);
      color: #FFFFFF;
    }

    /* 按钮定制 */
    .btn-action-neon {
      background-color: var(--primary-neon);
      color: var(--pitch-black);
      font-weight: 700;
      border: none;
      border-radius: var(--radius-sm);
      padding: 10px 22px;
      font-size: 0.9375rem;
      box-shadow: 0 4px 14px rgba(204, 255, 0, 0.3);
      transition: all 0.25s ease;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      min-height: 48px;
    }
    .btn-action-neon:hover {
      background-color: #E2FF4D;
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(204, 255, 0, 0.45);
      color: #000000;
    }
    .btn-action-outline {
      background: transparent;
      color: #FFFFFF;
      border: 1px solid rgba(255, 255, 255, 0.25);
      font-weight: 600;
      border-radius: var(--radius-sm);
      padding: 10px 20px;
      font-size: 0.9375rem;
      transition: all 0.25s;
      min-height: 48px;
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .btn-action-outline:hover {
      background: rgba(255, 255, 255, 0.1);
      border-color: var(--primary-neon);
      color: var(--primary-neon);
    }

    /* 全局板块骨架 */
    .biz-section {
      padding: 90px 0;
      position: relative;
    }
    .biz-section-dark {
      background-color: var(--pitch-black);
      color: #F8FAFC;
    }
    .biz-section-slate {
      background-color: var(--bg-slate);
    }
    .biz-section-white {
      background-color: #FFFFFF;
    }
    .section-head {
      margin-bottom: 54px;
    }
    .section-badge {
      display: inline-block;
      padding: 4px 12px;
      background: rgba(16, 185, 129, 0.12);
      color: var(--primary-color);
      font-size: 0.8125rem;
      font-weight: 700;
      border-radius: 999px;
      text-transform: uppercase;
      letter-spacing: 0.5px;
      margin-bottom: 12px;
      border: 1px solid rgba(16, 185, 129, 0.25);
    }
    .biz-section-dark .section-badge {
      background: rgba(204, 255, 0, 0.15);
      color: var(--primary-neon);
      border-color: rgba(204, 255, 0, 0.3);
    }
    .section-title {
      font-size: 2.25rem;
      font-weight: 800;
      letter-spacing: -0.5px;
      margin-bottom: 16px;
      line-height: 1.25;
    }
    .section-desc {
      font-size: 1.0625rem;
      color: var(--text-muted);
      max-width: 780px;
      margin: 0 auto;
    }
    .biz-section-dark .section-desc {
      color: #94A3B8;
    }

    /* 卡片通用 */
    .biz-card {
      background: #FFFFFF;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-subtle);
      transition: all 0.3s ease;
      height: 100%;
      overflow: hidden;
    }
    .biz-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: var(--primary-color);
    }

    /* 板块01：Hero */
    .hero-strip {
      background: linear-gradient(180deg, var(--pitch-black) 0%, var(--dark-slate) 100%);
      color: #FFFFFF;
      position: relative;
      padding: 80px 0 100px;
      overflow: hidden;
      border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    }
    .hero-strip::after {
      content: "";
      position: absolute;
      top: -20%;
      right: -10%;
      width: 600px;
      height: 600px;
      background: radial-gradient(circle, rgba(16, 185, 129, 0.15) 0%, transparent 70%);
      pointer-events: none;
    }
    .hero-h1 {
      font-size: 3.25rem;
      font-weight: 900;
      line-height: 1.18;
      margin-bottom: 24px;
      letter-spacing: -1px;
    }
    .hero-h1 span {
      color: var(--primary-neon);
    }
    .hero-lead {
      font-size: 1.125rem;
      color: #CBD5E1;
      margin-bottom: 36px;
      line-height: 1.8;
      max-width: 620px;
    }
    .hero-mockup-wrap {
      position: relative;
      border-radius: var(--radius-lg);
      overflow: hidden;
      border: 1px solid rgba(255, 255, 255, 0.15);
      box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
    }
    .hero-mockup-wrap img {
      width: 100%;
      height: 440px;
      object-fit: cover;
      display: block;
    }
    .hero-floating-stat {
      position: absolute;
      bottom: 20px;
      left: 20px;
      right: 20px;
      background: rgba(15, 23, 42, 0.85);
      backdrop-filter: blur(8px);
      border: 1px solid rgba(255, 255, 255, 0.1);
      border-radius: var(--radius-sm);
      padding: 14px 18px;
      display: flex;
      justify-content: space-around;
      color: #FFFFFF;
    }
    .hero-stat-item span {
      display: block;
      font-size: 0.75rem;
      color: #94A3B8;
    }
    .hero-stat-item strong {
      font-family: var(--font-mono);
      font-size: 1.15rem;
      color: var(--primary-neon);
    }

    /* 板块02：动态指标看板 */
    .metric-box {
      padding: 30px 24px;
      background: #FFFFFF;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-subtle);
      border-left: 4px solid var(--primary-color);
    }
    .metric-value {
      font-family: var(--font-mono);
      font-size: 2.5rem;
      font-weight: 800;
      color: var(--dark-slate);
      line-height: 1;
      margin-bottom: 6px;
    }
    .metric-value span {
      font-size: 1.125rem;
      color: var(--primary-color);
      margin-left: 4px;
    }
    .metric-label {
      font-size: 0.9375rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 4px;
    }
    .metric-sub {
      font-size: 0.8125rem;
      color: var(--text-muted);
    }

    /* 板块03：服务矩阵 */
    .service-card-body {
      padding: 32px 28px;
    }
    .service-icon-box {
      width: 54px;
      height: 54px;
      border-radius: 10px;
      background: rgba(16, 185, 129, 0.12);
      color: var(--primary-color);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.6rem;
      margin-bottom: 20px;
    }
    .service-title {
      font-size: 1.25rem;
      font-weight: 700;
      margin-bottom: 12px;
    }
    .service-text {
      color: var(--text-muted);
      font-size: 0.9375rem;
      margin-bottom: 20px;
      line-height: 1.6;
    }
    .tech-tag {
      font-family: var(--font-mono);
      font-size: 0.75rem;
      padding: 3px 8px;
      background: #E2E8F0;
      color: #475569;
      border-radius: 4px;
      margin-right: 6px;
      display: inline-block;
    }

    /* 板块04：动作对比视差 */
    .compare-card {
      border-radius: var(--radius-md);
      padding: 36px 30px;
      height: 100%;
    }
    .compare-traditional {
      background: #FFFFFF;
      border: 1px dashed #CBD5E1;
    }
    .compare-ai {
      background: var(--dark-slate);
      color: #FFFFFF;
      border: 1px solid rgba(16, 185, 129, 0.4);
      box-shadow: 0 10px 30px rgba(16, 185, 129, 0.1);
    }
    .compare-list li {
      margin-bottom: 14px;
      display: flex;
      align-items: flex-start;
      gap: 12px;
      font-size: 0.9375rem;
    }

    /* 板块05：产品与设备方案 */
    .kit-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      display: flex;
      flex-direction: column;
      height: 100%;
    }
    .kit-card img {
      width: 100%;
      height: 210px;
      object-fit: cover;
    }
    .kit-content {
      padding: 28px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .kit-title {
      font-size: 1.25rem;
      font-weight: 700;
      margin-bottom: 8px;
    }
    .spec-item {
      font-family: var(--font-mono);
      font-size: 0.8125rem;
      color: #0F766E;
      background: #CCFBF1;
      padding: 4px 10px;
      border-radius: 4px;
      display: inline-block;
      margin-bottom: 14px;
    }

    /* 板块06：深度技术黑盒解析 */
    .dark-flow-box {
      background: #111827;
      border: 1px solid rgba(255, 255, 255, 0.1);
      border-radius: var(--radius-md);
      padding: 30px;
      height: 100%;
    }
    .dark-flow-step {
      display: flex;
      gap: 16px;
      margin-bottom: 24px;
    }
    .step-idx {
      width: 38px;
      height: 38px;
      border-radius: 50%;
      background: rgba(204, 255, 0, 0.15);
      border: 1px solid var(--primary-neon);
      color: var(--primary-neon);
      font-family: var(--font-mono);
      font-weight: 700;
      display: flex;
      align-items: center;
      justify-content: center;
      flex-shrink: 0;
    }

    /* 板块07：算法进化里程碑 */
    .timeline-item {
      position: relative;
      padding-left: 36px;
      margin-bottom: 32px;
    }
    .timeline-item::before {
      content: "";
      position: absolute;
      left: 7px;
      top: 6px;
      bottom: -32px;
      width: 2px;
      background: #E2E8F0;
    }
    .timeline-item:last-child::before {
      display: none;
    }
    .timeline-node {
      position: absolute;
      left: 0;
      top: 6px;
      width: 16px;
      height: 16px;
      border-radius: 50%;
      background: var(--primary-color);
      border: 3px solid #FFFFFF;
      box-shadow: 0 0 0 2px var(--primary-color);
    }
    .timeline-year {
      font-family: var(--font-mono);
      font-size: 0.875rem;
      color: var(--primary-dark);
      font-weight: 700;
      margin-bottom: 4px;
    }

    /* 板块08：案例分析 */
    .case-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      height: 100%;
    }
    .case-img {
      height: 220px;
      width: 100%;
      object-fit: cover;
    }
    .case-body {
      padding: 24px;
    }
    .case-stat-badge {
      background: #FEF3C7;
      color: #92400E;
      font-family: var(--font-mono);
      font-size: 0.8125rem;
      font-weight: 700;
      padding: 4px 10px;
      border-radius: 6px;
      display: inline-block;
      margin-bottom: 10px;
    }

    /* 板块09：前沿研究资讯 */
    .insight-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 26px;
      height: 100%;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .insight-meta {
      font-size: 0.8125rem;
      color: #94A3B8;
      margin-bottom: 12px;
    }

    /* 板块10：保障与合规 */
    .assurance-badge-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      text-align: center;
      height: 100%;
    }
    .assurance-icon {
      font-size: 2.2rem;
      color: var(--primary-color);
      margin-bottom: 12px;
    }

    /* 板块11：手风琴 FAQ */
    .custom-accordion .accordion-item {
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm) !important;
      margin-bottom: 16px;
      overflow: hidden;
      background: #FFFFFF;
    }
    .custom-accordion .accordion-button {
      font-weight: 700;
      font-size: 1.0625rem;
      color: var(--dark-slate);
      padding: 20px 24px;
      box-shadow: none;
      background-color: #FFFFFF;
    }
    .custom-accordion .accordion-button:not(.collapsed) {
      background-color: var(--bg-slate);
      color: var(--primary-dark);
      border-bottom: 1px solid var(--border-color);
    }
    .custom-accordion .accordion-body {
      padding: 20px 24px;
      color: #475569;
      font-size: 0.9375rem;
      line-height: 1.7;
    }

    /* 板块12：转化与表单预约 */
    .conversion-panel {
      background: linear-gradient(135deg, var(--pitch-black) 0%, var(--dark-slate) 100%);
      border-radius: var(--radius-lg);
      padding: 50px 40px;
      color: #FFFFFF;
      box-shadow: 0 25px 60px rgba(0, 0, 0, 0.25);
    }
    .form-dark .form-label {
      color: #CBD5E1;
      font-size: 0.875rem;
      font-weight: 500;
    }
    .form-dark .form-control,
    .form-dark .form-select {
      background: rgba(255, 255, 255, 0.08);
      border: 1px solid rgba(255, 255, 255, 0.2);
      color: #FFFFFF;
      border-radius: var(--radius-sm);
      padding: 12px 14px;
    }
    .form-dark .form-control:focus,
    .form-dark .form-select:focus {
      background: rgba(255, 255, 255, 0.12);
      border-color: var(--primary-neon);
      box-shadow: 0 0 0 3px rgba(204, 255, 0, 0.2);
      color: #FFFFFF;
    }
    .form-dark .form-select option {
      background: var(--dark-slate);
      color: #FFFFFF;
    }

    /* 页脚 */
    .site-footer {
      background: #06090E;
      color: #94A3B8;
      padding: 70px 0 30px;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      font-size: 0.875rem;
    }
    .footer-col-title {
      color: #FFFFFF;
      font-size: 1rem;
      font-weight: 700;
      margin-bottom: 20px;
    }
    .footer-links li {
      list-style: none;
      margin-bottom: 10px;
    }
    .footer-links a {
      color: #94A3B8;
    }
    .footer-links a:hover {
      color: var(--primary-neon);
    }
    .bottom-copyright {
      margin-top: 50px;
      padding-top: 24px;
      border-top: 1px solid rgba(255, 255, 255, 0.05);
      font-size: 0.8125rem;
    }

    /* 移动端与自适应优化 */
    @media (max-width: 991.98px) {
      .hero-h1 {
        font-size: 2.35rem;
      }
      .section-title {
        font-size: 1.85rem;
      }
      .hero-mockup-wrap img {
        height: 320px;
      }
      .conversion-panel {
        padding: 32px 20px;
      }
    }
    @media (max-width: 575.98px) {
      .biz-section {
        padding: 60px 0;
      }
      .hero-h1 {
        font-size: 1.95rem;
      }
      .hero-stat-item strong {
        font-size: 0.95rem;
      }
      .btn-action-neon, .btn-action-outline {
        width: 100%;
        justify-content: center;
      }
    }