/* 全局样式 */
body {
    margin: 0;
    font-family: 'Roboto', sans-serif;
    background: linear-gradient(135deg, #0A1F44, #12265B);
    color: white;
    line-height: 1.6;
    padding: 20px;
}
header {
    text-align: center;
    padding: 50px 0;
    background: linear-gradient(135deg, #0A1F44, #9B51E0);
    border-radius: 10px;
    margin-bottom: 30px;
}
header h1 {
    font-family: 'Poppins', sans-serif;
    font-size: 2.5em;
    margin: 0;
}
nav {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 30px;
}
.nav-item {
    padding: 15px 25px;
    margin: 5px;
    background: #9B51E0;
    border-radius: 5px;
    cursor: pointer;
    transition: transform 0.3s, box-shadow 0.3s;
    position: relative;
}
.nav-item:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 15px rgba(155,81,224,0.4);
}
.nav-item.active::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 50%;
    transform: translateX(-50%);
    width: 50%;
    height: 3px;
    background: linear-gradient(90deg, #00FFC6, #FF8C37);
}
.container {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
}
.section {
    background: #12265B;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.3);
}
.section h2 {
    font-family: 'Poppins', sans-serif;
    color: #9B51E0;
    margin-bottom: 15px;
}
.section p, .section ul, .section pre {
    margin-bottom: 15px;
}
.section ul {
    list-style: disc inside;
}
.section pre {
    background: #0A1F44;
    padding: 15px;
    border-radius: 5px;
    overflow-x: auto;
}
.section code {
    color: #FF8C37;
    font-family: 'Courier New', Courier, monospace;
}
.image-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 10px;
}
.image-grid img {
    width: 100%;
    border-radius: 5px;
    object-fit: cover;
}
.footer {
    text-align: center;
    margin-top: 40px;
    font-size: 0.9em;
    color: #AAAAAA;
}
@media (min-width: 480px) {
    .container {
        grid-template-columns: repeat(2, 1fr);
    }
}
@media (min-width: 768px) {
    .container {
        grid-template-columns: repeat(3, 1fr);
    }
}
@media (min-width: 1024px) {
    .container {
        grid-template-columns: repeat(4, 1fr);
    }
}
@media (min-width: 1200px) {
    .container {
        grid-template-columns: repeat(5, 1fr);
    }
}
@media (min-width: 1440px) {
    .container {
        grid-template-columns: repeat(6, 1fr);
    }
}
/* 动画效果 */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.5s ease;
}
.fade-in.active {
    opacity: 1;
    transform: translateY(0);
}
.button {
    padding: 10px 20px;
    background: linear-gradient(135deg, #00FFC6, #FF8C37);
    border: none;
    border-radius: 5px;
    color: white;
    cursor: pointer;
    transition: transform 0.3s, box-shadow 0.3s;
}
.button:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 15px rgba(255,140,55,0.4);
}