/* roulang page: index */
:root {
      --primary: #0D9488;
      --primary-dark: #0f766e;
      --primary-light: #ccfbf1;
      --accent: #2563EB;
      --accent-hover: #1d4ed8;
      --dark-canvas: #0F172A;
      --dark-card: #1E293B;
      --text-main: #0F172A;
      --text-body: #334155;
      --text-muted: #64748B;
      --border-color: #E2E8F0;
      --bg-slate: #F8FAFC;
    }
    html {
      scroll-behavior: smooth;
      font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
    }
    body {
      background-color: var(--bg-slate);
      color: var(--text-body);
      overflow-x: hidden;
      line-height: 1.65;
    }
    .hero-bg {
      background: linear-gradient(135deg, rgba(15, 23, 42, 0.94) 0%, rgba(13, 148, 136, 0.88) 100%), url('/assets/images/0b0ce4f1fded39e3.webp') center/cover no-repeat;
    }
    .accent-gradient-btn {
      background: linear-gradient(135deg, #0D9488 0%, #2563EB 100%);
      transition: all 0.3s ease;
    }
    .accent-gradient-btn:hover {
      box-shadow: 0 10px 25px -5px rgba(37, 99, 235, 0.4);
      transform: translateY(-2px);
    }
    .card-hover {
      transition: transform 0.25s ease, box-shadow 0.25s ease;
    }
    .card-hover:hover {
      transform: translateY(-4px);
      box-shadow: 0 12px 24px -6px rgba(15, 23, 42, 0.08);
    }
    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease-out;
    }
    .accordion-item.active .accordion-content {
      max-height: 280px;
    }
    .accordion-item.active .accordion-icon {
      transform: rotate(180deg);
    }