/* roulang page: index */
:root {
      --primary: #0A4D5C;
      --primary-dark: #083E4B;
      --accent: #10B981;
      --bg-dark: #0B1924;
      --bg-light: #F8FAFC;
      --text-main: #0F172A;
      --text-muted: #475569;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
      color: var(--text-main);
      background-color: #FFFFFF;
      line-height: 1.8;
      overflow-x: hidden;
    }
    .hero-bg {
      background-image: linear-gradient(rgba(11, 25, 36, 0.82), rgba(10, 77, 92, 0.88)), url('/assets/images/54545e890d91b003.jpg');
      background-size: cover;
      background-position: center;
    }
    .philosophy-bg {
      background-image: linear-gradient(rgba(11, 25, 36, 0.94), rgba(11, 25, 36, 0.94)), url('/assets/images/eaef8a4560b9963d.jpg');
      background-size: cover;
      background-position: center;
    }
    .section-title {
      position: relative;
      padding-bottom: 0.75rem;
    }
    .section-title::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 48px;
      height: 3px;
      background-color: var(--accent);
      border-radius: 2px;
    }
    .section-title.center::after {
      left: 50%;
      transform: translateX(-50%);
    }
    .card-hover {
      transition: all 0.25s ease;
    }
    .card-hover:hover {
      transform: translateY(-4px);
      box-shadow: 0 16px 28px -8px rgba(10, 77, 92, 0.12);
    }
    /* 手风琴平滑动效 */
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s cubic-bezier(0, 1, 0, 1);
    }
    .faq-item.active .faq-answer {
      max-height: 500px;
      transition: max-height 0.4s ease-in-out;
    }
    .faq-item.active .faq-icon {
      transform: rotate(180deg);
    }