/* roulang page: index */
:root {
      --primary: hsl(198, 88%, 32%);
      --primary-hover: hsl(198, 88%, 26%);
      --accent: hsl(165, 80%, 40%);
      --bg-light: hsl(210, 20%, 98%);
      --bg-dark: hsl(215, 35%, 12%);
      --text-main: hsl(215, 25%, 18%);
      --text-muted: hsl(215, 12%, 48%);
      --border-color: hsl(210, 18%, 90%);
      --card-radius: 18px;
      --card-shadow: 0 10px 30px -6px rgba(15, 23, 42, 0.06);
      --card-shadow-hover: 0 18px 36px -4px rgba(12, 110, 148, 0.16);
    }

    body {
      background-color: var(--bg-light);
      color: var(--text-main);
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      overflow-x: hidden;
      line-height: 1.75;
    }

    .glass-nav {
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(14px);
      -webkit-backdrop-filter: blur(14px);
      border-bottom: 1px solid rgba(226, 232, 240, 0.85);
    }

    .badge-pill {
      background: rgba(12, 110, 148, 0.08);
      color: var(--primary);
      border: 1px solid rgba(12, 110, 148, 0.2);
    }

    .btn-gradient {
      background: linear-gradient(135deg, hsl(198, 88%, 32%) 0%, hsl(165, 80%, 40%) 100%);
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .btn-gradient:hover {
      box-shadow: 0 8px 24px -2px rgba(12, 110, 148, 0.35);
      transform: translateY(-2px);
    }

    .card-modern {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--card-radius);
      box-shadow: var(--card-shadow);
      transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
    }
    .card-modern:hover {
      transform: translateY(-5px);
      box-shadow: var(--card-shadow-hover);
      border-color: rgba(12, 110, 148, 0.4);
    }

    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.35s ease;
    }
    .accordion-item.active .accordion-content {
      max-height: 300px;
    }
    .accordion-item.active .accordion-icon {
      transform: rotate(180deg);
    }

    html {
      scroll-behavior: smooth;
    }