/* roulang page: index */
:root {
      --bg-page: #f8fafc;
      --bg-surface: #ffffff;
      --color-primary: #059669;
      --color-primary-dark: #047857;
      --color-navy: #0f172a;
      --color-navy-dark: #0b132b;
      --text-main: #1e293b;
      --text-muted: #64748b;
      --border-color: #e2e8f0;
      --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.05);
      --shadow-md: 0 4px 6px -1px rgba(15, 23, 42, 0.08);
      --shadow-lg: 0 12px 24px -4px rgba(15, 23, 42, 0.12);
      --radius-base: 10px;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      background-color: var(--bg-page);
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

    .container-wide {
      width: 100%;
      max-width: 1240px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.25rem;
      padding-right: 1.25rem;
    }

    /* Card Hover System */
    .feature-card {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-base);
      transition: all 0.28s ease;
    }
    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
      border-color: #cbd5e1;
    }

    /* Accordion Reset */
    details summary::-webkit-details-marker {
      display: none;
    }

    /* Custom Input Focus */
    input:focus, select:focus, textarea:focus {
      outline: none;
      border-color: var(--color-primary);
      box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.18);
    }