/* roulang page: index */
:root {
      --bg-main: #060B18;
      --bg-surface: #0A1226;
      --bg-card: rgba(16, 28, 58, 0.65);
      --cyan: #00F2FE;
      --orange: #FF5E3A;
      --text-white: #F8FAFC;
      --text-gray: #94A3B8;
      --border-cyan: rgba(0, 242, 254, 0.18);
    }
    
    html {
      scroll-behavior: smooth;
      font-family: -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    }

    body {
      background-color: var(--bg-main);
      color: var(--text-white);
      overflow-x: hidden;
      line-height: 1.75;
    }

    /* 玻璃拟态卡片 */
    .glass-card {
      background: var(--bg-card);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid var(--border-cyan);
      transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    }
    .glass-card:hover {
      border-color: rgba(0, 242, 254, 0.55);
      transform: translateY(-3px);
      box-shadow: 0 12px 30px rgba(0, 242, 254, 0.12);
    }

    /* 科技感发光按钮 */
    .btn-glow {
      position: relative;
      background: linear-gradient(135deg, #00F2FE 0%, #0077FE 50%, #FF5E3A 100%);
      background-size: 200% 200%;
      box-shadow: 0 0 20px rgba(0, 242, 254, 0.35);
      transition: all 0.3s ease;
    }
    .btn-glow:hover {
      background-position: right center;
      box-shadow: 0 0 32px rgba(255, 94, 58, 0.55);
      transform: translateY(-2px);
    }

    /* 斜切色块裁剪蒙版 */
    .hero-cut {
      clip-path: polygon(0 0, 100% 0, 100% calc(100% - 5vw), 0 100%);
    }

    /* 细网格背景 */
    .tech-grid-bg {
      background-image: 
        linear-gradient(to right, rgba(0, 242, 254, 0.05) 1px, transparent 1px),
        linear-gradient(to bottom, rgba(0, 242, 254, 0.05) 1px, transparent 1px);
      background-size: 40px 40px;
    }

    /* 手风琴折叠动画 */
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease-out;
    }
    .faq-item.active .faq-answer {
      max-height: 240px;
    }
    .faq-item.active .faq-icon {
      transform: rotate(180deg);
      color: #00F2FE;
    }

    /* 脉冲红点与呼吸光标 */
    .pulse-dot {
      box-shadow: 0 0 0 0 rgba(0, 242, 254, 0.7);
      animation: pulse 1.8s infinite cubic-bezier(0.66, 0, 0, 1);
    }
    @keyframes pulse {
      to {
        box-shadow: 0 0 0 10px rgba(0, 242, 254, 0);
      }
    }