/* roulang page: index */
:root {
      --deep-blue: #0A0E27;
      --card-blue: #1A1F3A;
      --electric-cyan: #00F0FF;
      --violet: #7B61FF;
      --text-white: #FFFFFF;
      --text-light-steel: #B0C4DE;
      --text-muted: #6B7B8D;
      --glass-bg: rgba(26, 31, 58, 0.6);
      --glass-border: rgba(0, 240, 255, 0.15);
      --radius-lg: 20px;
      --radius-full: 50px;
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4), 0 0 0 1px rgba(0, 240, 255, 0.1);
      --font-inter: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-inter);
      background: radial-gradient(circle at 20% 10%, #0f1535, #050816 80%);
      color: var(--text-light-steel);
      line-height: 1.6;
      margin: 0;
      padding: 0;
      -webkit-font-smoothing: antialiased;
    }

    /* 自定义背景网格纹理 */
    body::before {
      content: "";
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: 
        linear-gradient(rgba(0, 240, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 240, 255, 0.03) 1px, transparent 1px);
      background-size: 60px 60px;
      pointer-events: none;
      z-index: -1;
    }

    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-card);
      transition: transform 0.2s ease, border-color 0.3s ease, box-shadow 0.3s ease;
    }

    .glass-card:hover {
      border-color: rgba(0, 240, 255, 0.4);
      box-shadow: 0 12px 40px rgba(0, 0, 0, 0.5), 0 0 12px rgba(0, 240, 255, 0.25);
      transform: translateY(-4px);
    }

    .btn-primary {
      background: linear-gradient(135deg, #00F0FF, #7B61FF);
      border: none;
      border-radius: var(--radius-full);
      color: white;
      font-weight: 700;
      padding: 0.875rem 2rem;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: all 0.3s ease;
      box-shadow: 0 4px 15px rgba(0, 240, 255, 0.3);
      text-decoration: none;
      letter-spacing: 0.5px;
    }

    .btn-primary:hover {
      box-shadow: 0 0 30px rgba(0, 240, 255, 0.7), 0 0 15px rgba(123, 97, 255, 0.5);
      transform: translateY(-2px);
      color: white;
    }

    .btn-ghost {
      background: transparent;
      border: 1px solid var(--electric-cyan);
      border-radius: var(--radius-full);
      color: var(--electric-cyan);
      font-weight: 600;
      padding: 0.875rem 2rem;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: all 0.3s ease;
      text-decoration: none;
    }

    .btn-ghost:hover {
      background: rgba(0, 240, 255, 0.1);
      box-shadow: 0 0 18px rgba(0, 240, 255, 0.4);
      color: white;
      border-color: white;
    }

    .text-gradient {
      background: linear-gradient(to right, #00F0FF, #7B61FF);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .nav-pill {
      background: rgba(255, 255, 255, 0.05);
      backdrop-filter: blur(8px);
      border-radius: 40px;
      padding: 0.4rem 1.1rem;
      color: var(--text-light-steel);
      transition: all 0.25s;
      font-weight: 500;
      white-space: nowrap;
    }

    .nav-pill:hover {
      background: rgba(0, 240, 255, 0.15);
      color: white;
    }

    .nav-pill.active {
      background: rgba(0, 240, 255, 0.2);
      color: white;
      box-shadow: 0 2px 10px rgba(0, 240, 255, 0.4);
      border-bottom: 2px solid var(--electric-cyan);
    }

    .faq-item {
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }

    .faq-question {
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 1.2rem 0;
      font-weight: 600;
      color: white;
      transition: color 0.2s;
    }

    .faq-question:hover {
      color: var(--electric-cyan);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1);
      color: var(--text-light-steel);
      padding-right: 1.5rem;
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      margin-bottom: 1rem;
    }

    .faq-icon {
      font-size: 1.5rem;
      font-weight: 300;
      transition: transform 0.3s;
      color: var(--electric-cyan);
    }

    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    .pricing-popular {
      border: 2px solid transparent;
      background-clip: padding-box;
      position: relative;
      border-radius: var(--radius-lg);
      background: linear-gradient(var(--deep-blue), var(--deep-blue)) padding-box,
                  linear-gradient(135deg, #00F0FF, #7B61FF) border-box;
      box-shadow: 0 0 30px rgba(0, 240, 255, 0.4);
    }

    .scrollbar-hide::-webkit-scrollbar {
      display: none;
    }
    .scrollbar-hide {
      -ms-overflow-style: none;
      scrollbar-width: none;
    }

    @media (max-width: 768px) {
      .mobile-menu {
        display: none;
      }
      .mobile-menu.open {
        display: flex;
        flex-direction: column;
        background: rgba(10, 14, 39, 0.95);
        backdrop-filter: blur(20px);
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        padding: 1.5rem;
        border-bottom: 1px solid rgba(0,240,255,0.2);
      }
    }