/* roulang page: index */
:root {
      --bg-deep: #0b0e14;
      --bg-card: #131822;
      --bg-panel: #1a202c;
      --primary: #00ff87;
      --primary-hover: #00e077;
      --accent-purple: #6e3aff;
      --text-main: #ffffff;
      --text-muted: #94a3b8;
      --border-subtle: rgba(255, 255, 255, 0.08);
      --border-glow: rgba(0, 255, 135, 0.25);
    }
    html {
      scroll-behavior: smooth;
      background-color: var(--bg-deep);
      color: var(--text-main);
      font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
    }
    body {
      margin: 0;
      padding: 0;
      line-height: 1.7;
    }
    .custom-container {
      width: 100%;
      max-width: 1240px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.25rem;
      padding-right: 1.25rem;
    }
    .hero-glow {
      background: radial-gradient(circle at 50% 30%, rgba(110, 58, 255, 0.2) 0%, rgba(0, 255, 135, 0.05) 50%, rgba(11, 14, 20, 0) 80%);
    }
    .circuit-border {
      border: 1px solid var(--border-subtle);
      transition: all 0.25s ease;
    }
    .circuit-border:hover {
      border-color: var(--border-glow);
      box-shadow: 0 4px 20px rgba(0, 255, 135, 0.1);
    }
    .tag-badge {
      display: inline-flex;
      align-items: center;
      gap: 0.35rem;
      padding: 0.25rem 0.75rem;
      border-radius: 9999px;
      font-size: 0.75rem;
      font-weight: 600;
      border: 1px solid rgba(0, 255, 135, 0.3);
      color: var(--primary);
      background: rgba(0, 255, 135, 0.05);
    }
    .tag-purple {
      border-color: rgba(110, 58, 255, 0.3);
      color: #bfa6ff;
      background: rgba(110, 58, 255, 0.08);
    }
    .cta-btn-primary {
      background: var(--primary);
      color: #05080c;
      font-weight: 700;
      padding: 0.75rem 1.75rem;
      border-radius: 6px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 0.5rem;
      transition: all 0.2s ease;
    }
    .cta-btn-primary:hover {
      background: var(--primary-hover);
      box-shadow: 0 0 20px rgba(0, 255, 135, 0.4);
      transform: translateY(-1px);
    }
    .cta-btn-secondary {
      background: rgba(255, 255, 255, 0.05);
      color: var(--text-main);
      font-weight: 600;
      border: 1px solid var(--border-subtle);
      padding: 0.75rem 1.75rem;
      border-radius: 6px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: all 0.2s ease;
    }
    .cta-btn-secondary:hover {
      border-color: var(--primary);
      color: var(--primary);
      background: rgba(0, 255, 135, 0.05);
    }
    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease-out;
    }
    .accordion-item.active .accordion-content {
      max-height: 250px;
    }
    .accordion-item.active .accordion-icon {
      transform: rotate(180deg);
      color: var(--primary);
    }