/* Flex布局体系 */
        body {
            display: flex;
            flex-direction: column;
            min-height: 100vh;
            margin: 0;
            font-family: yuanshen, sans-serif;
            background-image: url('爱丽丝.jpg');
            background-size: cover;
            background-repeat: no-repeat;
            background-attachment: fixed;
            background-position: center;
            overflow-x: hidden;
        }

        .lightbox {
            flex: 1;
            display: flex;
            justify-content: center;
            align-items: center;
            padding: 40px 0;
        }

        @font-face {
            font-family: 'yuanshen';
            src: url('yuanshen.ttf') format('truetype');
        }

        .center-text {
            text-align: center;
        }

        /* 导航栏样式 - 桌面版 */
        nav {
            background-color: rgba(255, 255, 255, 0.1);
            backdrop-filter: blur(15px);
            -webkit-backdrop-filter: blur(15px);
            border-radius: 12px;
            padding: 12px 24px;
            margin: 20px auto;
            width: fit-content;
            box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
            border: 1px solid rgba(255, 255, 255, 0.3);
        }

        nav ul {
            list-style: none;
            margin: 0;
            padding: 0;
            display: flex;
            gap: 1.5rem;
        }

        nav ul li a {
            color: #ffffff;
            text-decoration: none;
            padding: 8px 16px;
            border-radius: 8px;
            transition: all 0.3s ease;
            font-family: 'Microsoft YaHei', sans-serif;
            font-weight: 500;
        }

        nav ul li a:hover {
            background-color: rgba(255, 255, 255, 0.25);
            transform: translateY(-2px);
        }

        /* 下拉菜单 - 桌面版 */
        nav ul li ul {
            display: none;
            position: absolute;
            background: rgba(255, 255, 255, 0.1);
            backdrop-filter: blur(16px);
            min-width: 160px;
            border-radius: 8px;
            margin-top: 8px;
            opacity: 0;
            visibility: hidden;
            transform: translateY(10px);
            transition: all 0.3s ease-out;
        }

        nav ul li:hover ul {
            display: flex;
            flex-direction: column;
        }

        nav ul li:hover ul {
            opacity: 1;
            visibility: visible;
            transform: translateY(0);
        }

        /* 移动端样式 */
        .mobile-menu-btn {
            display: none;
            position: fixed;
            top: 20px;
            right: 20px;
            z-index: 1001;
            background: rgba(255,255,255,0.2);
            backdrop-filter: blur(10px);
            border: none;
            border-radius: 50%;
            width: 44px;
            height: 44px;
            font-size: 24px;
            color: white;
            cursor: pointer;
        }

        .mobile-nav {
            position: fixed;
            top: 0;
            right: -100%;
            height: 100vh;
            width: 70%;
            max-width: 300px;
            background: rgba(255,255,255,0.1);
            backdrop-filter: blur(20px);
            padding: 20px;
            transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
            z-index: 1000;
            box-shadow: -5px 0 15px rgba(0,0,0,0.2);
            opacity: 0;
            transform: translateX(20px);
        }

        .mobile-nav.active {
            right: 0;
            opacity: 1;
            transform: translateX(0);
            transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1), 
                        -webkit-backdrop-filter 0.3s ease;
            transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1), 
                        backdrop-filter 0.3s ease;
        }

        .mobile-nav ul {
            list-style: none;
            padding: 0;
            margin-top: 60px;
        }

        .mobile-nav li {
            margin: 15px 0;
        }

        .mobile-nav a {
            color: white;
            text-decoration: none;
            padding: 12px;
            display: block;
            border-radius: 8px;
            background: rgba(255,255,255,0.1);
        }

        /* 子菜单动画 */
        .submenu {
            max-height: 0;
            overflow: hidden;
            opacity: 0;
            transform: scaleY(0.8);
            transform-origin: top;
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            display: block !important;
            transition-property: opacity, transform, max-height;
        }

        /* 响应式适配 */
        @media (max-width: 768px) {
            nav {
                display: none;
            }
            
            .mobile-menu-btn {
                display: block;
            }
            
            .lightbox {
                padding: 30% 0 50px;
            }
            
            h1 {
                font-size: 1.8rem !important;
            }
            
            footer {
                font-size: 0.75rem;
                padding: 8px 10px;
            }
        }

        @media (max-width: 480px) {
            .mobile-nav {
                width: 85%;
            }
            
            .lightbox {
                padding: 25% 0 40px;
            }
            
            h1 {
                font-size: 1.5rem !important;
                line-height: 1.3;
            }
            
            footer {
                font-size: 0.65rem;
                padding: 6px 8px;
            }
        }

        /* 公共样式 */
        h1 {
            color: pink;
            font-size: 2em;
            text-align: center;
            margin-top: 0.5%;
            transition: all 0.3s ease;
        }

        footer {
            background-color: rgba(173, 216, 230, 0.3);
            text-align: center;
            padding: 12px;
            margin-top: auto;
            backdrop-filter: blur(5px);
            font-size: 0.875rem;
            line-height: 1.4;
        }

        #feedback {
            position: fixed;
            bottom: 20px;
            left: 50%;
            transform: translateX(-50%);
            background-color: rgba(255, 0, 0, 0.8);
            color: white;
            padding: 10px 20px;
            border-radius: 5px;
            display: none;
            z-index: 1000;
        }