/* 渐变极光主题样式 */
body {
    margin: 0;
    font-family: 'Arial', sans-serif;
    background: linear-gradient(135deg, #0F2027, #324B51, #A1C4FD);
    background-size: 400% 400%;
    animation: gradientAnimation 15s ease infinite;
    color: #fff;
    overflow-x: hidden;
}
@keyframes gradientAnimation {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}
.container {
    max-width: 1440px;
    margin: 0 auto;
    padding: 20px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(15, 32, 39, 0.8);
    backdrop-filter: blur(10px);
    z-index: 1000;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 20px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}
.navbar a {
    color: #fff;
    text-decoration: none;
    font-size: 16px;
    transition: color 0.3s ease;
}
.navbar a:hover {
    color: #FFD687;
}
.sidebar {
    background: rgba(15, 32, 39, 0.8);
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
    transition: transform 0.3s ease;
}
.sidebar:hover {
    transform: translateX(5px);
}
.card {
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
    padding: 20px;
    margin: 10px;
    transition: transform 0.3s ease;
    position: relative;
}
.card:hover {
    transform: scale(1.05);
}
.card img {
    width: 100%;
    height: auto;
    border-radius: 10px;
    object-fit: cover;
    margin-bottom: 10px;
}
button {
    background: #FFD687;
    border: none;
    padding: 10px 20px;
    border-radius: 5px;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    transition: background 0.3s ease;
}
button:hover {
    background: #FFC14D;
}
button::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255, 214, 135, 0.8);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    opacity: 0;
    transition: all 0.3s ease;
}
button:active::after {
    width: 100px;
    height: 100px;
    opacity: 1;
}
.footer {
    background: rgba(15, 32, 39, 0.8);
    padding: 20px;
    text-align: center;
    margin-top: 20px;
    border-radius: 10px;
    box-shadow: 0 -4px 10px rgba(0, 0, 0, 0.2);
}
@media (max-width: 768px) {
    .container {
        grid-template-columns: 1fr;
    }
    .navbar {
        flex-direction: column;
        align-items: flex-start;
    }
    .sidebar {
        display: none;
    }
}
@media (min-width: 1200px) {
    .container {
        grid-template-columns: 1fr 2fr 1fr;
    }
}