/* roulang page: index */
:root {
            --primary: #1E40AF;
            --primary-light: #2563EB;
            --secondary: #0284C7;
            --accent: #D97706;
            --bg-body: #F8FAFC;
            --text-main: #0F172A;
            --text-muted: #64748B;
            --border-color: #E2E8F0;
        }
        
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            background-color: var(--bg-body);
            color: var(--text-main);
            -webkit-font-smoothing: antialiased;
        }

        /* 纯CSS下拉菜单 */
        .nav-dropdown:hover .dropdown-menu,
        .nav-dropdown:focus-within .dropdown-menu {
            opacity: 1;
            visibility: visible;
            transform: translateY(0);
        }

        .dropdown-menu {
            opacity: 0;
            visibility: hidden;
            transform: translateY(8px);
            transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
        }

        /* 响应式平滑过渡 */
        .smooth-transition {
            transition: all 0.25s ease-in-out;
        }

/* roulang page: category1 */
:root {
            --primary: #1E40AF;
            --primary-light: #2563EB;
            --secondary: #0284C7;
            --accent: #D97706;
            --bg-body: #F8FAFC;
            --text-main: #0F172A;
            --text-muted: #64748B;
            --border-color: #E2E8F0;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            background-color: var(--bg-body);
            color: var(--text-main);
            -webkit-font-smoothing: antialiased;
        }
        .smooth-transition {
            transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
        }
        .dropdown-menu {
            opacity: 0;
            visibility: hidden;
            transform: translateY(8px);
            transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
        }
        .group:hover .dropdown-menu {
            opacity: 1;
            visibility: visible;
            transform: translateY(0);
        }
        .aspect-video-box {
            position: relative;
            padding-bottom: 56.25%;
            height: 0;
            overflow: hidden;
        }