/* roulang page: index */
:root {
      --deep-blue: #0A0E27;
      --panel-bg: #0F1335;
      --electric-cyan: #00E5FF;
      --signal-purple: #7B2FFF;
      --glow-white: rgba(255,255,255,0.85);
      --glass-bg: rgba(255,255,255,0.03);
      --glass-border: rgba(255,255,255,0.06);
      --shadow-glow: 0 8px 32px rgba(0,229,255,0.08);
    }
    * {
      box-sizing: border-box;
    }
    body {
      background-color: var(--deep-blue);
      color: var(--glow-white);
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
      margin: 0;
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }
    .glass-card {
      background: rgba(255,255,255,0.03);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: 20px;
      transition: all 0.25s ease;
    }
    .glass-card:hover {
      border-color: rgba(0,229,255,0.3);
      box-shadow: 0 8px 32px rgba(0,229,255,0.12);
      transform: scale(1.02);
    }
    .btn-primary {
      background: linear-gradient(135deg, #00E5FF, #7B2FFF);
      border: none;
      border-radius: 12px;
      color: #0A0E27;
      font-weight: 600;
      padding: 14px 32px;
      box-shadow: 0 0 20px rgba(0,229,255,0.3);
      transition: all 0.2s ease;
      display: inline-block;
      text-align: center;
      cursor: pointer;
      font-size: 16px;
      text-decoration: none;
    }
    .btn-primary:hover {
      box-shadow: 0 0 32px rgba(0,229,255,0.5);
      transform: scale(1.04);
    }
    .btn-ghost {
      background: transparent;
      border: 1px solid rgba(255,255,255,0.2);
      border-radius: 12px;
      color: #fff;
      backdrop-filter: blur(10px);
      padding: 14px 32px;
      font-weight: 500;
      transition: all 0.2s ease;
      display: inline-block;
      text-align: center;
      cursor: pointer;
      font-size: 16px;
      text-decoration: none;
    }
    .btn-ghost:hover {
      border-color: #00E5FF;
      background: rgba(0,229,255,0.05);
      color: #fff;
    }
    .nav-dock {
      background: rgba(10,14,39,0.8);
      backdrop-filter: blur(24px);
      -webkit-backdrop-filter: blur(24px);
      border: 1px solid rgba(255,255,255,0.08);
      box-shadow: 0 4px 24px rgba(0,0,0,0.5);
    }
    input, textarea {
      background: rgba(255,255,255,0.04);
      border: 1px solid rgba(255,255,255,0.08);
      border-radius: 12px;
      padding: 14px 18px;
      color: #fff;
      font-size: 15px;
      outline: none;
      transition: all 0.2s;
      width: 100%;
    }
    input:focus, textarea:focus {
      border-color: #00E5FF;
      box-shadow: 0 0 0 3px rgba(0,229,255,0.1);
    }
    .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: 20px 0;
      font-weight: 500;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      color: rgba(255,255,255,0.7);
      line-height: 1.8;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 20px;
    }
    .faq-icon {
      transition: transform 0.3s;
      color: #00E5FF;
      font-size: 20px;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }
    .mobile-menu {
      display: none;
    }
    @media (max-width: 768px) {
      .desktop-nav {
        display: none;
      }
      .mobile-menu {
        display: flex;
      }
      .hero-image {
        margin-top: 2rem;
      }
    }
    .gradient-text {
      background: linear-gradient(135deg, #00E5FF, #7B2FFF);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .waterfall-grid {
      columns: 3;
      column-gap: 24px;
    }
    @media (max-width: 1024px) {
      .waterfall-grid {
        columns: 2;
      }
    }
    @media (max-width: 640px) {
      .waterfall-grid {
        columns: 1;
      }
    }
    .waterfall-item {
      break-inside: avoid;
      margin-bottom: 24px;
    }