/* roulang page: index */
:root {
      --bg-primary: #060b14;
      --bg-secondary: #0c192c;
      --bg-tertiary: #0f223f;
      --color-cyan: #00d2ff;
      --color-blue: #3a86ff;
      --color-purple: #7b2cbf;
      --text-main: #f8fafc;
      --text-muted: #94a3b8;
      --text-sub: #64748b;
      --border-glow: rgba(0, 210, 255, 0.25);
    }
    body {
      background-color: var(--bg-primary);
      color: var(--text-main);
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      overflow-x: hidden;
    }
    .glass-card {
      background: rgba(12, 25, 44, 0.72);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid rgba(0, 210, 255, 0.16);
      box-shadow: 0 10px 35px 0 rgba(0, 0, 0, 0.45);
      transition: all 0.35s cubic-bezier(0.16, 1, 0.3, 1);
    }
    .glass-card:hover {
      border-color: rgba(0, 210, 255, 0.55);
      box-shadow: 0 0 28px rgba(0, 210, 255, 0.28);
      transform: translateY(-3px);
    }
    .glow-btn-primary {
      background: linear-gradient(135deg, #00d2ff 0%, #3a86ff 100%);
      color: #030812;
      box-shadow: 0 0 18px rgba(0, 210, 255, 0.45);
      transition: all 0.3s ease;
    }
    .glow-btn-primary:hover {
      box-shadow: 0 0 32px rgba(0, 210, 255, 0.85);
      transform: translateY(-2px);
      filter: brightness(1.1);
    }
    .glow-btn-secondary {
      background: rgba(0, 210, 255, 0.08);
      border: 1px solid rgba(0, 210, 255, 0.35);
      color: #00d2ff;
      box-shadow: 0 0 12px rgba(0, 210, 255, 0.15);
      transition: all 0.3s ease;
    }
    .glow-btn-secondary:hover {
      background: rgba(0, 210, 255, 0.18);
      border-color: #00d2ff;
      color: #ffffff;
      box-shadow: 0 0 24px rgba(0, 210, 255, 0.4);
      transform: translateY(-2px);
    }
    .tech-border-top {
      position: relative;
    }
    .tech-border-top::before {
      content: "";
      position: absolute;
      top: 0;
      left: 15%;
      right: 15%;
      height: 1px;
      background: linear-gradient(90deg, transparent, #00d2ff, transparent);
    }
    .glow-badge {
      background: rgba(0, 210, 255, 0.1);
      border: 1px solid rgba(0, 210, 255, 0.3);
      color: #00d2ff;
      box-shadow: 0 0 8px rgba(0, 210, 255, 0.25);
    }
    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease-out, opacity 0.3s ease;
      opacity: 0;
    }
    .accordion-item.active .accordion-content {
      max-height: 280px;
      opacity: 1;
    }
    .accordion-item.active .accordion-icon {
      transform: rotate(180deg);
      color: #00d2ff;
    }
    .accordion-item.active {
      border-color: rgba(0, 210, 255, 0.5);
      box-shadow: 0 0 20px rgba(0, 210, 255, 0.2);
    }