/* roulang page: index */
:root {
      --primary: #0F52BA;
      --primary-dark: #083377;
      --accent: #00C9A7;
      --warning: #FF7A00;
      --bg-dark: #0A0F1D;
      --bg-surface: #131B2E;
      --text-main: #1E293B;
      --text-muted: #64748B;
      --border-color: #E2E8F0;
    }
    
    html {
      scroll-behavior: smooth;
    }

    body {
      color: var(--text-main);
      background-color: #FFFFFF;
      -webkit-font-smoothing: antialiased;
    }

    /* 斜切效果与装饰 */
    .hero-skew-bg {
      clip-path: polygon(0 0, 100% 0, 100% 92%, 0 100%);
    }
    @media (max-width: 768px) {
      .hero-skew-bg {
        clip-path: none;
      }
    }

    .glass-card {
      background: rgba(255, 255, 255, 0.08);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border: 1px solid rgba(255, 255, 255, 0.15);
    }

    .light-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      box-shadow: 0 4px 12px -2px rgba(15, 82, 186, 0.04);
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .light-card:hover {
      transform: translateY(-4px);
      box-shadow: 0 16px 24px -4px rgba(15, 82, 186, 0.12);
      border-color: rgba(15, 82, 186, 0.3);
    }

    /* 交互手风琴 */
    .faq-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease-out;
    }
    .faq-item.active .faq-content {
      max-height: 280px;
    }
    .faq-item.active .faq-icon {
      transform: rotate(180deg);
    }

    /* 时间线与连线 */
    .timeline-line::before {
      content: '';
      position: absolute;
      left: 50%;
      top: 0;
      bottom: 0;
      width: 2px;
      background: #CBD5E1;
      transform: translateX(-50%);
    }
    @media (max-width: 768px) {
      .timeline-line::before {
        left: 20px;
      }
    }