/* 页面全局样式 */
body {
    margin: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #0074D9, #FF69B4);
    color: #fff;
    line-height: 1.6;
    overflow-x: hidden;
}
.container {
    max-width: 1400px;
    margin: auto;
    padding: 20px;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
}
.card {
    background-color: rgba(255, 255, 255, 0.8);
    border-radius: 15px;
    box-shadow: 0px 8px 15px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    width: calc(33.33% - 20px);
    margin-bottom: 20px;
    padding: 20px;
    position: relative;
}
.card:hover {
    transform: scale(1.05);
    box-shadow: 0px 12px 20px rgba(0, 0, 0, 0.2);
}
h2 {
    text-align: center;
    margin-top: 20px;
    font-size: 2rem;
    color: #fff;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 20px;
}
.navbar ul {
    list-style: none;
    display: flex;
    gap: 20px;
}
.navbar a {
    color: #fff;
    text-decoration: none;
    font-size: 1rem;
    transition: color 0.3s ease;
}
.navbar a:hover {
    color: #FF69B4;
}
@media (max-width: 768px) {
    .card {
        width: calc(50% - 20px);
    }
}
@media (max-width: 480px) {
    .card {
        width: 100%;
    }
}
.cloud-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 200%;
    height: 200%;
    background: url('https://images.gptkong.com/demo/sample1.png'), url('https://images.gptkong.com/demo/sample2.png');
    background-repeat: repeat;
    animation: moveClouds 60s infinite linear;
    z-index: -1;
    opacity: 0.3;
}
@keyframes moveClouds {
    0% { transform: translateX(0) translateY(0); }
    100% { transform: translateX(-50%) translateY(-50%); }
}