/* roulang page: index */
:root {
            --primary: #1D4ED8;
            --primary-light: #3B82F6;
            --primary-dark: #1E40AF;
            --accent: #0D9488;
            --accent-purple: #4F46E5;
            --bg-light: #F8FAFC;
            --bg-card: #FFFFFF;
            --text-main: #1E293B;
            --text-sub: #64748B;
            --border-color: #E2E8F0;
        }

        html {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            -webkit-tap-highlight-color: transparent;
        }

        body {
            background-color: #F8FAFC;
            color: var(--text-main);
            overflow-x: hidden;
        }

        .hero-slide {
            transition: opacity 0.8s ease-in-out, visibility 0.8s ease-in-out;
        }

        .hero-slide.hidden-slide {
            opacity: 0;
            visibility: hidden;
            pointer-events: none;
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
        }

        .hero-slide.active-slide {
            opacity: 1;
            visibility: visible;
            position: relative;
        }

        .accordion-content {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .accordion-item.active .accordion-content {
            max-height: 400px;
        }

        .accordion-item.active .accordion-icon {
            transform: rotate(180deg);
        }

        .glass-header {
            background-color: rgba(255, 255, 255, 0.94);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
        }