/* 顶部导航菜单样式 */
nav {
    background-color: #1b5e20;
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 10px rgba(0,0,0,0.2);
}

nav ul {
    display: flex;
    justify-content: center;
    list-style: none;
    flex-wrap: wrap;
}

nav ul li {
    margin: 0 15px;
    position: relative;
}

nav ul li a {
    color: white;
    text-decoration: none;
    font-weight: bold;
    font-size: 1.1rem;
    padding: 5px 10px;
    border-radius: 4px;
    transition: all 0.3s;
    display: block;
}

nav ul li a:hover {
    color: #ffc107;
    background-color: rgba(255,255,255,0.1);
}

nav ul li a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 50%;
    transform: translateX(-50%) scaleX(0);
    width: 80%;
    height: 2px;
    background-color: #ffc107;
    transition: transform 0.3s;
}

nav ul li a:hover::after {
    transform: translateX(-50%) scaleX(1);
}

@media (max-width: 768px) {
    nav ul li {
        margin: 0 8px;
    }
    
    nav ul li a {
        font-size: 1rem;
    }
}


		
		/* 漂浮的叶子，加载*/
		@keyframes float {
            0% {
                transform: translateY(0) rotate(0deg);
                opacity: 0;
            }
            10% {
                opacity: 1;
            }
            90% {
                opacity: 1;
            }
            100% {
                transform: translateY(-500px) rotate(360deg);
                opacity: 0;
            }
        }
		
		@keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(20px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        
        @keyframes ripple {
            0% {
                transform: scale(0, 0);
                opacity: 1;
            }
            20% {
                transform: scale(25, 25);
                opacity: 1;
            }
            100% {
                opacity: 0;
                transform: scale(40, 40);
            }
        }