/* roulang page: index */
:root {
      --primary-deep: #0A0E27;
      --accent-cyan: #00F0FF;
      --accent-pink: #FF3CAC;
      --glass-bg: rgba(255, 255, 255, 0.05);
      --glass-border: rgba(0, 240, 255, 0.2);
      --text-light: #B0C4DE;
      --text-muted: rgba(255, 255, 255, 0.6);
      --card-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
      --cyan-glow: 0 0 20px rgba(0, 240, 255, 0.6);
      --pink-glow: 0 0 25px rgba(255, 60, 172, 0.7);
      --border-radius-card: 16px;
      --border-radius-btn: 50px;
      --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      --transition-smooth: all 0.3s ease;
    }

    * {
      box-sizing: border-box;
    }

    body {
      background-color: var(--primary-deep);
      color: var(--text-light);
      font-family: var(--font-sans);
      line-height: 1.8;
      margin: 0;
      overflow-x: hidden;
      position: relative;
    }

    /* 背景粒子网格效果 */
    body::before {
      content: "";
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: radial-gradient(circle at 30% 40%, rgba(0, 240, 255, 0.08) 0%, transparent 30%),
                        radial-gradient(circle at 80% 70%, rgba(255, 60, 172, 0.06) 0%, transparent 40%);
      pointer-events: none;
      z-index: 0;
    }

    .container, .container-fluid {
      position: relative;
      z-index: 2;
    }

    /* 自定义滚动条 */
    ::-webkit-scrollbar {
      width: 6px;
    }
    ::-webkit-scrollbar-track {
      background: var(--primary-deep);
    }
    ::-webkit-scrollbar-thumb {
      background: var(--accent-cyan);
      border-radius: 3px;
    }

    /* 导航栏 - 玻璃效果 */
    .navbar-custom {
      background: rgba(10, 14, 39, 0.75);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid var(--glass-border);
      padding: 0.8rem 0;
      transition: var(--transition-smooth);
    }
    .navbar-brand {
      font-weight: 700;
      font-size: 1.8rem;
      color: var(--accent-cyan) !important;
      letter-spacing: 1px;
      text-shadow: 0 0 15px rgba(0,240,255,0.4);
    }
    .nav-chip {
      background: rgba(255,255,255,0.05);
      border-radius: 50px;
      padding: 0.5rem 1.4rem;
      margin: 0 0.2rem;
      color: var(--text-light);
      font-weight: 500;
      transition: var(--transition-smooth);
      border: 1px solid transparent;
      text-decoration: none;
      display: inline-block;
    }
    .nav-chip:hover, .nav-chip.active {
      background: var(--accent-cyan);
      color: var(--primary-deep);
      border-color: var(--accent-cyan);
      box-shadow: var(--cyan-glow);
      text-decoration: none;
    }
    .btn-cta-nav {
      border: 2px solid var(--accent-cyan);
      color: var(--accent-cyan);
      background: transparent;
      border-radius: var(--border-radius-btn);
      padding: 0.5rem 2rem;
      font-weight: 600;
      transition: var(--transition-smooth);
    }
    .btn-cta-nav:hover {
      background: var(--accent-cyan);
      color: var(--primary-deep);
      box-shadow: var(--cyan-glow);
    }

    /* 区块标题 */
    .section-title {
      font-size: 2.25rem;
      font-weight: 600;
      color: #fff;
      margin-bottom: 2.5rem;
      position: relative;
      padding-left: 1.2rem;
    }
    .section-title::before {
      content: "";
      position: absolute;
      left: 0;
      top: 50%;
      transform: translateY(-50%);
      width: 4px;
      height: 28px;
      background: var(--accent-cyan);
      box-shadow: 0 0 15px var(--accent-cyan);
      border-radius: 4px;
    }

    /* 玻璃卡片 */
    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: var(--border-radius-card);
      box-shadow: var(--card-shadow);
      transition: var(--transition-smooth);
      color: #fff;
    }
    .glass-card:hover {
      transform: translateY(-5px);
      box-shadow: 0 12px 40px rgba(0, 240, 255, 0.2);
      border-color: rgba(0,240,255,0.4);
    }

    /* 按钮 */
    .btn-glow {
      border: 2px solid var(--accent-cyan);
      background: transparent;
      color: var(--accent-cyan);
      border-radius: var(--border-radius-btn);
      padding: 0.8rem 2.5rem;
      font-weight: 700;
      transition: var(--transition-smooth);
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }
    .btn-glow:hover {
      background: var(--accent-cyan);
      color: var(--primary-deep);
      box-shadow: var(--cyan-glow);
    }
    .btn-pink-glow {
      border-color: var(--accent-pink);
      color: var(--accent-pink);
    }
    .btn-pink-glow:hover {
      background: var(--accent-pink);
      color: #fff;
      box-shadow: var(--pink-glow);
      border-color: var(--accent-pink);
    }

    /* 数字动画 */
    .metric-number {
      font-size: 3.5rem;
      font-weight: 700;
      font-family: 'Inter', sans-serif;
      font-feature-settings: "tnum";
      letter-spacing: -0.5px;
    }
    .text-cyan {
      color: var(--accent-cyan);
    }
    .text-pink {
      color: var(--accent-pink);
    }

    /* Hero 看板卡片 */
    .stat-card {
      padding: 1.8rem 1rem;
      text-align: center;
    }

    /* 服务卡片错落 */
    .service-card {
      position: relative;
      padding-left: 1.8rem;
      margin-bottom: 2rem;
    }
    .service-card::before {
      content: "";
      position: absolute;
      left: 0;
      top: 10%;
      height: 70%;
      width: 3px;
      background: linear-gradient(to bottom, var(--accent-cyan), transparent);
    }

    /* 进度条 */
    .progress-custom {
      background: rgba(255,255,255,0.1);
      border-radius: 20px;
      height: 12px;
    }
    .progress-bar-cyan {
      background: var(--accent-cyan);
      box-shadow: 0 0 15px var(--accent-cyan);
      border-radius: 20px;
    }
    .progress-bar-pink {
      background: var(--accent-pink);
      box-shadow: 0 0 15px var(--accent-pink);
    }

    /* FAQ 手风琴 */
    .accordion-button {
      background: var(--glass-bg);
      backdrop-filter: blur(15px);
      color: #fff;
      font-weight: 600;
      border: 1px solid var(--glass-border);
      border-radius: 16px !important;
      padding: 1.2rem 1.8rem;
    }
    .accordion-button:not(.collapsed) {
      background: rgba(0,240,255,0.1);
      color: var(--accent-cyan);
      box-shadow: none;
      border-left: 4px solid var(--accent-cyan);
    }
    .accordion-item {
      background: transparent;
      border: none;
      margin-bottom: 1rem;
    }

    /* 移动端底部导航 */
    .mobile-nav {
      display: none;
    }

    @media (max-width: 768px) {
      .desktop-nav {
        display: none !important;
      }
      .mobile-nav {
        display: flex;
        position: fixed;
        bottom: 0;
        left: 0;
        width: 100%;
        background: rgba(10,14,39,0.9);
        backdrop-filter: blur(25px);
        border-top: 1px solid var(--glass-border);
        padding: 0.6rem 1rem;
        justify-content: space-around;
        z-index: 99;
        padding-bottom: calc(0.6rem + env(safe-area-inset-bottom));
      }
      .mobile-nav a {
        color: var(--text-muted);
        text-align: center;
        font-size: 0.75rem;
        text-decoration: none;
      }
      .mobile-nav i {
        font-size: 1.4rem;
        display: block;
      }
      .mobile-cta {
        background: var(--accent-cyan);
        color: var(--primary-deep) !important;
        border-radius: 40px;
        padding: 0.4rem 1.5rem;
        font-weight: bold;
      }
      .stat-card .metric-number {
        font-size: 2.2rem;
      }
      .section-title {
        font-size: 1.8rem;
      }
    }