/* roulang page: index */
:root {
      --bg-primary: #070b14;
      --bg-secondary: #0b132b;
      --bg-tertiary: #0a192f;
      --brand-cyan: #00d2ff;
      --brand-emerald: #00ffa3;
      --brand-blue: #1e50ff;
      --text-pure: #ffffff;
      --text-main: #e2e8f0;
      --text-muted: #94a3b8;
      --card-bg: rgba(15, 23, 42, 0.72);
      --card-border: rgba(0, 210, 255, 0.18);
      --card-border-hover: rgba(0, 210, 255, 0.5);
      --card-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.45);
      --card-shadow-hover: 0 14px 40px 0 rgba(0, 210, 255, 0.22);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --trans-smooth: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    }

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

    body {
      background-color: var(--bg-primary);
      color: var(--text-main);
      font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
      line-height: 1.65;
      overflow-x: hidden;
      scroll-behavior: smooth;
    }

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

    /* 顶部微信息条 */
    .top-meta-bar {
      background-color: #03060c;
      border-bottom: 1px solid rgba(255, 255, 255, 0.06);
      font-size: 0.82rem;
      padding: 6px 0;
      color: var(--text-muted);
    }
    .status-pulse {
      display: inline-block;
      width: 8px;
      height: 8px;
      background: var(--brand-emerald);
      border-radius: 50%;
      margin-right: 6px;
      box-shadow: 0 0 8px var(--brand-emerald);
    }

    /* 主导航 */
    .main-header {
      background: rgba(7, 11, 20, 0.88);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(0, 210, 255, 0.12);
      position: sticky;
      top: 0;
      z-index: 1020;
      transition: var(--trans-smooth);
    }
    .nav-brand-wrap {
      display: flex;
      align-items: center;
      gap: 12px;
      font-weight: 700;
      font-size: 1.28rem;
      color: var(--text-pure);
      letter-spacing: 0.5px;
    }
    .nav-brand-wrap i {
      color: var(--brand-cyan);
      font-size: 1.4rem;
      text-shadow: 0 0 12px rgba(0, 210, 255, 0.8);
    }
    .nav-custom-links .nav-link {
      color: var(--text-main);
      font-size: 0.95rem;
      padding: 0.5rem 1rem;
      font-weight: 500;
      border-radius: var(--radius-sm);
    }
    .nav-custom-links .nav-link:hover,
    .nav-custom-links .nav-link.active {
      color: var(--brand-cyan);
      background: rgba(0, 210, 255, 0.08);
    }

    /* 发光与透光按钮系统 */
    .btn-glow-primary {
      background: linear-gradient(135deg, var(--brand-cyan), var(--brand-blue));
      color: #ffffff !important;
      border: none;
      font-weight: 600;
      padding: 10px 24px;
      border-radius: 50px;
      box-shadow: 0 0 20px rgba(0, 210, 255, 0.45);
      transition: var(--trans-smooth);
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .btn-glow-primary:hover {
      box-shadow: 0 0 32px rgba(0, 210, 255, 0.8);
      transform: translateY(-2px);
    }
    .btn-glass-secondary {
      background: rgba(255, 255, 255, 0.05);
      color: var(--text-main) !important;
      border: 1px solid rgba(0, 210, 255, 0.3);
      backdrop-filter: blur(8px);
      font-weight: 500;
      padding: 9px 22px;
      border-radius: 50px;
      transition: var(--trans-smooth);
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .btn-glass-secondary:hover {
      border-color: var(--brand-cyan);
      color: #ffffff !important;
      background: rgba(0, 210, 255, 0.12);
      transform: translateY(-2px);
    }

    /* 通用板块与排版 */
    section {
      padding: 85px 0;
      position: relative;
    }
    .sec-alt {
      background-color: var(--bg-secondary);
    }
    .sec-tertiary {
      background: linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-tertiary) 50%, var(--bg-primary) 100%);
    }
    .section-badge {
      display: inline-block;
      font-size: 0.8rem;
      text-transform: uppercase;
      letter-spacing: 1px;
      padding: 4px 14px;
      border-radius: 50px;
      background: rgba(0, 210, 255, 0.1);
      border: 1px solid rgba(0, 210, 255, 0.3);
      color: var(--brand-cyan);
      margin-bottom: 12px;
    }
    .sec-title {
      font-size: 2.15rem;
      font-weight: 700;
      color: var(--text-pure);
      margin-bottom: 14px;
      line-height: 1.35;
    }
    .sec-desc {
      color: var(--text-muted);
      font-size: 1rem;
      max-width: 760px;
      margin: 0 auto 40px auto;
      line-height: 1.7;
    }

    /* 玻璃拟态卡片 */
    .glass-card {
      background: var(--card-bg);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid var(--card-border);
      box-shadow: var(--card-shadow);
      border-radius: var(--radius-md);
      padding: 30px 26px;
      transition: var(--trans-smooth);
      height: 100%;
      position: relative;
      overflow: hidden;
    }
    .glass-card:hover {
      border-color: var(--card-border-hover);
      box-shadow: var(--card-shadow-hover);
      transform: translateY(-4px);
    }

    /* 首屏 Hero */
    .hero-section {
      padding: 100px 0 80px 0;
      background-image: linear-gradient(rgba(7, 11, 20, 0.85), rgba(7, 11, 20, 0.95)), url('/assets/images/fc8887f0eb6d2d22.jpg');
      background-size: cover;
      background-position: center;
      border-bottom: 1px solid rgba(0, 210, 255, 0.15);
    }
    .hero-h1 {
      font-size: 2.9rem;
      font-weight: 800;
      line-height: 1.25;
      color: var(--text-pure);
      margin-bottom: 20px;
    }
    .hero-h1 .gradient-text {
      background: linear-gradient(90deg, var(--brand-cyan), var(--brand-emerald));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-lead {
      font-size: 1.12rem;
      color: var(--text-main);
      margin-bottom: 30px;
      line-height: 1.75;
    }
    .hero-card-trial {
      border: 1px solid rgba(0, 255, 163, 0.35);
      background: rgba(10, 25, 47, 0.85);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: 0 10px 40px rgba(0, 255, 163, 0.12);
    }
    .trial-badge {
      background: rgba(0, 255, 163, 0.15);
      color: var(--brand-emerald);
      padding: 4px 12px;
      border-radius: 4px;
      font-weight: 600;
      font-size: 0.85rem;
    }

    /* 榜单与矩阵元素 */
    .rank-num {
      width: 32px;
      height: 32px;
      background: rgba(0, 210, 255, 0.15);
      color: var(--brand-cyan);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border-radius: 8px;
      font-weight: 700;
    }
    .step-badge {
      width: 44px;
      height: 44px;
      line-height: 44px;
      text-align: center;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--brand-cyan), var(--brand-blue));
      font-weight: 700;
      font-size: 1.2rem;
      color: #fff;
      margin-bottom: 18px;
      box-shadow: 0 0 15px rgba(0, 210, 255, 0.4);
    }

    /* 计量数据条 */
    .metric-box {
      border-right: 1px solid rgba(255, 255, 255, 0.1);
      padding: 20px;
      text-align: center;
    }
    .metric-box:last-child {
      border-right: none;
    }
    .metric-num {
      font-size: 2.6rem;
      font-weight: 800;
      color: var(--brand-cyan);
      line-height: 1.2;
    }

    /* 表单组件 */
    .custom-form-control {
      background: rgba(15, 23, 42, 0.85);
      border: 1px solid rgba(0, 210, 255, 0.25);
      color: var(--text-pure);
      border-radius: var(--radius-sm);
      padding: 12px 16px;
    }
    .custom-form-control:focus {
      background: rgba(15, 23, 42, 0.95);
      border-color: var(--brand-cyan);
      box-shadow: 0 0 10px rgba(0, 210, 255, 0.3);
      color: var(--text-pure);
    }
    .form-check-input:checked {
      background-color: var(--brand-cyan);
      border-color: var(--brand-cyan);
    }

    /* 手风琴改造 */
    .accordion-item {
      background: var(--card-bg) !important;
      border: 1px solid var(--card-border) !important;
      margin-bottom: 14px;
      border-radius: var(--radius-sm) !important;
      overflow: hidden;
    }
    .accordion-button {
      background: transparent !important;
      color: var(--text-pure) !important;
      font-weight: 600;
      box-shadow: none !important;
      padding: 18px 24px;
    }
    .accordion-button:not(.collapsed) {
      color: var(--brand-cyan) !important;
      border-bottom: 1px solid rgba(0, 210, 255, 0.15);
    }
    .accordion-button::after {
      filter: invert(1);
    }
    .accordion-body {
      color: var(--text-muted);
      line-height: 1.75;
      padding: 20px 24px;
    }

    /* 页脚 */
    .main-footer {
      background: #04070d;
      border-top: 1px solid rgba(0, 210, 255, 0.15);
      padding: 70px 0 30px 0;
      color: var(--text-muted);
      font-size: 0.92rem;
    }
    .footer-title {
      color: var(--text-pure);
      font-weight: 600;
      margin-bottom: 20px;
      font-size: 1.05rem;
    }
    .footer-links li {
      margin-bottom: 10px;
      list-style: none;
    }
    .footer-links a:hover {
      color: var(--brand-cyan);
      padding-left: 4px;
    }

    @media (max-width: 991px) {
      .hero-h1 {
        font-size: 2.2rem;
      }
      .sec-title {
        font-size: 1.8rem;
      }
      .metric-box {
        border-right: none;
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        margin-bottom: 15px;
      }
    }