/* roulang page: index */
:root {
      --primary: #05F18F;
      --primary-hover: #04d980;
      --secondary: #0F141C;
      --secondary-surface: #1C2331;
      --accent: #FF6B00;
      --accent-hover: #e56000;
      --bg-dark: #0A0D14;
      --bg-light: #F8F9FA;
      --text-main: #212529;
      --text-muted: #6C757D;
      --text-white: #FFFFFF;
      --text-light: #E9ECEF;
      --border-color: rgba(255, 255, 255, 0.08);
      --border-light: rgba(0, 0, 0, 0.08);
      --radius-sm: 6px;
      --radius-md: 12px;
      --radius-pill: 50px;
      --shadow-base: 0 4px 20px rgba(0, 0, 0, 0.04);
      --shadow-hover: 0 12px 28px rgba(0, 0, 0, 0.08);
      --shadow-dark: 0 12px 32px rgba(5, 241, 143, 0.08);
      --transition-fast: all 0.3s ease;
    }

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

    body {
      font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
      background-color: #FFFFFF;
      color: var(--text-main);
      line-height: 1.65;
      overflow-x: hidden;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition-fast);
    }

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

    .font-num {
      font-family: Din, "Segoe UI", system-ui, sans-serif;
    }

    /* 顶部信息栏 */
    .top-info-bar {
      background-color: var(--bg-dark);
      color: #8C98A4;
      font-size: 0.82rem;
      border-bottom: 1px solid var(--border-color);
      min-height: 38px;
    }

    .top-info-bar a {
      color: #ADB5BD;
    }

    .top-info-bar a:hover {
      color: var(--primary);
    }

    /* 主导航 */
    .site-nav {
      background-color: var(--secondary);
      border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    }

    .navbar-brand {
      font-size: 1.25rem;
      font-weight: 700;
      letter-spacing: -0.2px;
      color: var(--text-white) !important;
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .brand-mark {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 32px;
      height: 32px;
      border-radius: var(--radius-sm);
      background: linear-gradient(135deg, var(--primary), #00A86B);
      color: var(--secondary);
      font-weight: 900;
      font-size: 1.1rem;
    }

    .nav-link {
      color: var(--text-light) !important;
      font-size: 0.95rem;
      font-weight: 500;
      padding: 0.6rem 0.9rem !important;
      border-radius: var(--radius-sm);
      transition: var(--transition-fast);
    }

    .nav-link:hover, .nav-link.active {
      color: var(--primary) !important;
      background: rgba(5, 241, 143, 0.06);
    }

    .btn-brand-cta {
      background-color: var(--accent);
      color: #FFFFFF !important;
      font-weight: 600;
      font-size: 0.92rem;
      border-radius: var(--radius-sm);
      padding: 0.55rem 1.25rem;
      border: 1px solid var(--accent);
      transition: var(--transition-fast);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
    }

    .btn-brand-cta:hover {
      background-color: var(--accent-hover);
      border-color: var(--accent-hover);
      transform: translateY(-1px);
    }

    .btn-brand-ghost {
      background: transparent;
      color: var(--primary) !important;
      border: 1px solid var(--primary);
      font-weight: 600;
      border-radius: var(--radius-sm);
      padding: 0.55rem 1.25rem;
      transition: var(--transition-fast);
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }

    .btn-brand-ghost:hover {
      background: rgba(5, 241, 143, 0.12);
      color: var(--primary) !important;
    }

    /* 统一 Section */
    .site-section {
      padding: 85px 0;
      position: relative;
    }

    .bg-canvas-light {
      background-color: var(--bg-light);
    }

    .bg-canvas-pure {
      background-color: #FFFFFF;
    }

    .bg-canvas-dark {
      background-color: var(--bg-dark);
      color: var(--text-light);
    }

    .bg-canvas-charcoal {
      background-color: var(--secondary);
      color: var(--text-light);
    }

    .section-eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      font-size: 0.84rem;
      font-weight: 700;
      letter-spacing: 1px;
      text-transform: uppercase;
      padding: 4px 12px;
      border-radius: var(--radius-pill);
      margin-bottom: 12px;
    }

    .eyebrow-accent {
      background: rgba(255, 107, 0, 0.1);
      color: var(--accent);
    }

    .eyebrow-primary {
      background: rgba(5, 241, 143, 0.12);
      color: var(--primary);
    }

    .section-title {
      font-size: 2.15rem;
      font-weight: 800;
      letter-spacing: -0.5px;
      line-height: 1.3;
      margin-bottom: 14px;
    }

    .section-desc {
      font-size: 1.02rem;
      color: var(--text-muted);
      line-height: 1.7;
    }

    .dark-desc {
      color: #94A3B8;
    }

    /* 样式卡片通用 */
    .custom-card {
      background: #FFFFFF;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-base);
      transition: var(--transition-fast);
      height: 100%;
    }

    .custom-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }

    .card-dark-style {
      background: var(--secondary-surface);
      border: 1px solid rgba(255, 255, 255, 0.08);
      color: #E2E8F0;
    }

    .card-dark-style:hover {
      border-color: rgba(5, 241, 143, 0.35);
      box-shadow: var(--shadow-dark);
    }

    /* 首屏 Hero */
    .hero-wrapper {
      position: relative;
      background: linear-gradient(180deg, var(--secondary) 0%, var(--bg-dark) 100%);
      color: #FFFFFF;
      overflow: hidden;
      padding: 40px 0 70px 0;
    }

    .carousel-item {
      min-height: 520px;
    }

    .hero-h1 {
      font-size: 2.75rem;
      font-weight: 800;
      line-height: 1.25;
      letter-spacing: -0.8px;
    }

    .hero-h1 span {
      color: var(--primary);
    }

    .hero-stage-card {
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid rgba(255, 255, 255, 0.12);
      box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
      background: #000;
      position: relative;
    }

    .hero-stage-card img {
      width: 100%;
      height: 380px;
      object-fit: cover;
      opacity: 0.88;
      transition: transform 0.6s ease;
    }

    .hero-stage-card:hover img {
      transform: scale(1.03);
    }

    .hero-telemetry-tag {
      position: absolute;
      bottom: 14px;
      left: 14px;
      right: 14px;
      background: rgba(15, 20, 28, 0.88);
      backdrop-filter: blur(8px);
      padding: 10px 14px;
      border-radius: var(--radius-sm);
      border: 1px solid rgba(5, 241, 143, 0.25);
      font-size: 0.85rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    /* 板块 2 痛点 */
    .pain-card {
      border-top: 3px solid #E53E3E;
    }

    /* 板块 4 优势 */
    .feature-icon-box {
      width: 48px;
      height: 48px;
      border-radius: var(--radius-sm);
      background: rgba(5, 241, 143, 0.12);
      color: #00874c;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-size: 1.4rem;
      margin-bottom: 16px;
    }

    .metric-badge {
      font-size: 0.78rem;
      padding: 3px 8px;
      border-radius: var(--radius-sm);
      background: #F1F3F5;
      color: #495057;
      font-weight: 600;
      display: inline-block;
    }

    /* 板块 5 核心产品 */
    .product-core-ring {
      border: 2px solid var(--primary) !important;
      position: relative;
    }

    .engine-ribbon {
      position: absolute;
      top: -12px;
      right: 20px;
      background: var(--primary);
      color: var(--secondary);
      font-size: 0.76rem;
      font-weight: 800;
      padding: 3px 10px;
      border-radius: var(--radius-pill);
      letter-spacing: 0.5px;
    }

    /* 板块 6 流程步进 */
    .step-box {
      position: relative;
    }

    .step-counter {
      width: 44px;
      height: 44px;
      background: var(--secondary);
      color: var(--primary);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 1.1rem;
      margin-bottom: 14px;
      border: 2px solid rgba(5, 241, 143, 0.3);
    }

    /* 板块 8 数据指标条 */
    .metric-hero-val {
      font-size: 2.85rem;
      font-weight: 800;
      line-height: 1;
      color: var(--accent);
    }

    /* 板块 12 FAQ Accordion 深度重绘 */
    .accordion-item {
      background: #FFFFFF;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-sm) !important;
      margin-bottom: 12px;
      overflow: hidden;
    }

    .accordion-button {
      font-weight: 700;
      font-size: 1.02rem;
      color: var(--text-main);
      padding: 1.15rem 1.4rem;
      background: #FFFFFF;
      box-shadow: none !important;
    }

    .accordion-button:not(.collapsed) {
      color: #007C44;
      background-color: #F8FDFC;
      border-left: 4px solid var(--primary);
    }

    .accordion-body {
      padding: 1.15rem 1.4rem 1.35rem 1.4rem;
      color: #495057;
      font-size: 0.96rem;
      line-height: 1.7;
    }

    /* 底部收口 */
    .cta-card-panel {
      background: linear-gradient(135deg, var(--secondary) 0%, #051A14 100%);
      border: 1px solid rgba(5, 241, 143, 0.2);
      border-radius: var(--radius-md);
      padding: 45px 35px;
    }

    /* 站点页脚 */
    .site-footer {
      background-color: var(--bg-dark);
      color: #8C98A4;
      border-top: 1px solid var(--border-color);
      padding: 65px 0 25px 0;
      font-size: 0.92rem;
    }

    .footer-title {
      color: #FFFFFF;
      font-weight: 700;
      font-size: 1rem;
      margin-bottom: 18px;
    }

    .footer-links {
      list-style: none;
      padding-left: 0;
    }

    .footer-links li {
      margin-bottom: 9px;
    }

    .footer-links a:hover {
      color: var(--primary);
    }

    .footer-subbar {
      border-top: 1px solid rgba(255, 255, 255, 0.06);
      margin-top: 45px;
      padding-top: 22px;
      font-size: 0.85rem;
    }

    /* 移动端断点优化 */
    @media (max-width: 991px) {
      .hero-h1 {
        font-size: 2.15rem;
      }
      .section-title {
        font-size: 1.8rem;
      }
      .site-section {
        padding: 60px 0;
      }
      .hero-stage-card img {
        height: 280px;
      }
    }

    @media (max-width: 576px) {
      .hero-h1 {
        font-size: 1.75rem;
      }
      .btn-brand-cta, .btn-brand-ghost {
        width: 100%;
      }
      .metric-hero-val {
        font-size: 2.3rem;
      }
    }