/* roulang page: index */
:root {
      --bg-main: #070B19;
      --bg-alt: #0B132B;
      --neon-blue: #38BDF8;
      --neon-glow: rgba(56, 189, 248, 0.28);
      --glass-border: rgba(255, 255, 255, 0.08);
      --glass-border-hover: rgba(56, 189, 248, 0.45);
      --text-main: #F8FAFC;
      --text-muted: #94A3B8;
    }

    * {
      box-sizing: border-box;
      scroll-behavior: smooth;
    }

    body {
      background-color: var(--bg-main);
      color: var(--text-main);
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
      overflow-x: hidden;
      line-height: 1.6;
    }

    /* 斜切色块与背景微纹 */
    .hero-skew-band {
      background: linear-gradient(135deg, rgba(37, 99, 235, 0.18) 0%, rgba(11, 19, 43, 0.85) 60%, rgba(7, 11, 25, 0.95) 100%);
      clip-path: polygon(0 0, 100% 0, 100% 88%, 0 100%);
    }

    .grid-bg-overlay {
      background-image: radial-gradient(rgba(56, 189, 248, 0.12) 1px, transparent 1px);
      background-size: 32px 32px;
    }

    /* 玻璃拟态与霓虹发光卡片 */
    .glass-card {
      background: rgba(15, 23, 42, 0.65);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border: 1px solid var(--glass-border);
      border-radius: 1rem;
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }

    .glass-card:hover {
      border-color: var(--glass-border-hover);
      box-shadow: 0 0 25px var(--neon-glow);
      transform: translateY(-3px);
    }

    /* 发光按钮 */
    .glow-btn-primary {
      background: linear-gradient(135deg, #2563EB 0%, #0284C7 100%);
      box-shadow: 0 0 20px rgba(37, 99, 235, 0.45);
      transition: all 0.25s ease;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-height: 46px;
      min-width: 140px;
    }

    .glow-btn-primary:hover {
      box-shadow: 0 0 30px rgba(56, 189, 248, 0.7);
      transform: translateY(-1px) scale(1.02);
    }

    .glow-btn-secondary {
      background: rgba(15, 23, 42, 0.7);
      border: 1px solid rgba(56, 189, 248, 0.3);
      backdrop-filter: blur(8px);
      transition: all 0.25s ease;
      min-height: 46px;
    }

    .glow-btn-secondary:hover {
      border-color: #38BDF8;
      background: rgba(37, 99, 235, 0.18);
      color: #FFFFFF;
    }

    /* 板块交替底色 */
    .section-band-alt {
      background-color: #0B132B;
      position: relative;
    }

    .section-band-dark {
      background-color: #070B19;
      position: relative;
    }

    /* 折叠手风琴样式 */
    details summary::-webkit-details-marker {
      display: none;
    }
    details summary {
      list-style: none;
    }