/* roulang page: index */
:root {
      --primary: #E65100;
      --primary-hover: #D84315;
      --primary-light: #FFF3E0;
      --secondary: #1E232A;
      --secondary-light: #2B313A;
      --accent: #00B4D8;
      --bg-light: #F8F9FA;
      --bg-dark: #12161A;
      --text-main: #111827;
      --text-muted: #4B5563;
      --text-sub: #9CA3AF;
      --border-color: rgba(229, 231, 235, 0.9);
      --card-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.04), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
      --card-shadow-hover: 0 20px 30px -10px rgba(230, 81, 0, 0.18);
    }

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

    body {
      background-color: #ffffff;
      color: var(--text-main);
      overflow-x: hidden;
    }

    .btn-gradient {
      background: linear-gradient(135deg, #E65100 0%, #FF6F00 100%);
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .btn-gradient:hover {
      background: linear-gradient(135deg, #D84315 0%, #E65100 100%);
      transform: translateY(-2px);
      box-shadow: 0 8px 20px -4px rgba(230, 81, 0, 0.4);
    }

    .card-hover-effect {
      transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
      border: 1px solid var(--border-color);
    }
    .card-hover-effect:hover {
      transform: translateY(-6px);
      box-shadow: var(--card-shadow-hover);
      border-color: rgba(230, 81, 0, 0.3);
    }

    .glass-nav {
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      background: rgba(255, 255, 255, 0.92);
    }

    .custom-badge {
      background: rgba(230, 81, 0, 0.08);
      border: 1px solid rgba(230, 81, 0, 0.2);
      color: #E65100;
    }

    .hero-mask {
      background: linear-gradient(to right, rgba(18, 22, 26, 0.92) 0%, rgba(18, 22, 26, 0.8) 55%, rgba(18, 22, 26, 0.5) 100%);
    }

    .accordion-content {
      transition: max-height 0.3s ease-out, opacity 0.3s ease-out;
    }