/* roulang page: index */
:root {
            --primary: #0052D9;
            --primary-hover: #003CAB;
            --secondary: #0A1C3E;
            --accent: #00A870;
            --text-main: #1D2129;
            --text-sub: #4E5969;
            --bg-light: #F5F7FA;
            --border-color: #E5E6EB;
        }
        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
            scroll-behavior: smooth;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            color: var(--text-main);
            background-color: #FFFFFF;
            line-height: 1.6;
        }
        .custom-card-shadow {
            box-shadow: 0 4px 20px rgba(0, 82, 217, 0.06);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .custom-card-shadow:hover {
            box-shadow: 0 12px 32px rgba(0, 82, 217, 0.12);
            transform: translateY(-2px);
        }
        .hero-bg-overlay {
            background: linear-gradient(135deg, rgba(10, 28, 62, 0.94) 0%, rgba(0, 82, 217, 0.88) 100%);
        }
        .accordion-content {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease-out;
        }
        .accordion-active .accordion-content {
            max-height: 280px;
        }
        .accordion-active .accordion-icon {
            transform: rotate(180deg);
        }