/* roulang page: index */
:root {
      --color-primary: #1A202C;
      --color-accent: #00D2B4;
      --color-warning: #F59E0B;
      --color-slate: #475569;
      --color-bg-light: #F8FAFC;
      --color-dark: #0F172A;
      --color-text-main: #0F172A;
      --color-text-body: #334155;
      --color-text-muted: #64748B;
      --radius-card: 12px;
      --radius-ui: 8px;
      --shadow-soft: 0 4px 20px -2px rgba(15, 23, 42, 0.06);
      --shadow-hover: 0 12px 28px -4px rgba(0, 210, 180, 0.18);
    }

    html {
      scroll-behavior: smooth;
      font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
    }

    body {
      background-color: var(--color-bg-light);
      color: var(--color-text-body);
      line-height: 1.65;
    }

    .container-custom {
      max-width: 1240px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.25rem;
      padding-right: 1.25rem;
    }

    .glass-nav {
      background: rgba(15, 23, 42, 0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
    }

    .card-base {
      background: #FFFFFF;
      border: 1px solid #E2E8F0;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-soft);
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }

    .card-base:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: rgba(0, 210, 180, 0.5);
    }

    .card-dark {
      background: #1E293B;
      border: 1px solid #334155;
      border-radius: var(--radius-card);
      transition: all 0.3s ease;
    }

    .card-dark:hover {
      border-color: var(--color-accent);
      transform: translateY(-4px);
    }

    .badge-accent {
      background: rgba(0, 210, 180, 0.12);
      color: #00A38C;
      border: 1px solid rgba(0, 210, 180, 0.3);
    }

    .btn-primary {
      background: #00D2B4;
      color: #0F172A;
      font-weight: 600;
      border-radius: var(--radius-ui);
      transition: all 0.25s ease;
      min-height: 44px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }

    .btn-primary:hover {
      background: #00B89E;
      box-shadow: 0 4px 14px rgba(0, 210, 180, 0.4);
    }

    .btn-outline {
      border: 1px solid #00D2B4;
      color: #00D2B4;
      font-weight: 600;
      border-radius: var(--radius-ui);
      transition: all 0.25s ease;
      min-height: 44px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }

    .btn-outline:hover {
      background: rgba(0, 210, 180, 0.1);
    }

    /* 手风琴样式 */
    .faq-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
    }
    .faq-active .faq-content {
      max-height: 240px;
    }
    .faq-active .faq-icon {
      transform: rotate(180deg);
    }