/* 页面基础样式 */
body {
    margin: 0;
    font-family: 'Roboto', sans-serif;
    background-color: #EDEDED;
    color: #3E8C46;
    line-height: 1.6;
    overflow-x: hidden;
}
h1, h2, h3 {
    font-family: 'Nunito', cursive;
    color: #3E8C46;
    text-align: center;
}
p {
    font-family: 'Roboto', sans-serif;
    line-height: 1.6;
    padding: 0 20px;
}
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
}
.card {
    background: rgba(255, 255, 255, 0.7);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    border-radius: 15px;
    margin: 10px;
    padding: 20px;
    flex: 1 1 calc(33.333% - 40px);
    transition: transform 0.3s ease-in-out;
}
.card:hover {
    transform: scale(1.05);
}
.feature-card {
    background-color: rgba(150, 111, 51, 0.8);
    border-radius: 10px;
    padding: 20px;
    color: #EDEDED;
}
.menu {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: #3E8C46;
    z-index: 1000;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 20px;
}
.menu a {
    color: #EDEDED;
    text-decoration: none;
    margin: 0 10px;
    font-size: 18px;
}
.side-menu {
    position: fixed;
    top: 60px;
    left: -250px;
    width: 250px;
    height: 100%;
    background: #966F33;
    transition: left 0.3s ease-in-out;
    padding: 20px;
}
.side-menu.active {
    left: 0;
}
.side-menu a {
    color: #EDEDED;
    text-decoration: none;
    display: block;
    margin: 10px 0;
}
.toggle-btn {
    background: #966F33;
    color: #EDEDED;
    border: none;
    padding: 10px;
    cursor: pointer;
    border-radius: 50%;
    font-size: 20px;
}
.loading-leaf {
    animation: leaf-fall 3s ease-in-out infinite;
}
@keyframes leaf-fall {
    0% { transform: translateY(0) rotate(0deg); }
    50% { transform: translateY(100px) rotate(30deg); }
    100% { transform: translateY(200px) rotate(-30deg); }
}
@media (max-width: 1024px) {
    .card {
        flex: 1 1 calc(50% - 40px);
    }
}
@media (max-width: 768px) {
    .card {
        flex: 1 1 100%;
    }
}