/* 全局样式设置 */
body {
    margin: 0;
    padding: 0;
    font-family: 'Roboto', sans-serif;
    background: linear-gradient(135deg, #03A9F4 70%, #F5F5F5 25%, #FF9800 5%);
    color: #333333;
}

/* 导航栏样式 */
.navbar {
    position: fixed; /* 固定在顶部 */
    top: 0;
    width: 100%;
    background-color: rgba(255, 255, 255, 0.9); /* 半透明背景 */
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1); /* 阴影效果 */
    z-index: 1000;
    padding: 20px 40px; /* 内边距 */
    transition: all 0.3s ease;
}

.navbar ul {
    display: flex;
    justify-content: center;
    list-style: none;
    margin: 0;
    padding: 0;
}

.navbar li {
    margin: 0 15px;
}

.navbar a {
    text-decoration: none;
    color: #03A9F4;
    font-size: 18px;
    transition: color 0.3s ease;
}

.navbar a:hover {
    color: #FF9800;
}

/* 主容器样式 */
.container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(500px, 1fr)); /* 每个板块最小500px */
    gap: 40px;
    padding: 100px 50px 50px 50px; /* 顶部留出导航栏空间 */
}

/* 文章样式 */
article {
    background-color: rgba(255, 255, 255, 0.8);
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

article h2, article h3, article h4 {
    color: #03A9F4;
}

article p {
    font-size: 16px;
    line-height: 1.6;
}

article pre {
    background-color: #F0F0F0;
    padding: 15px;
    border-radius: 5px;
    overflow-x: auto;
}

article code {
    color: #D32F2F;
    font-family: 'Courier New', Courier, monospace;
}

/* 图片样式 */
.image-gallery {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    justify-content: center;
}

.image-gallery img {
    width: 320px;
    height: 320px;
    border-radius: 15px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.image-gallery img:hover {
    transform: scale(1.05);
    box-shadow: 0 8px 16px rgba(0,0,0,0.3);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .navbar {
        padding: 15px 20px;
    }

    .navbar a {
        font-size: 16px;
    }

    .container {
        padding: 80px 20px 20px 20px;
        grid-template-columns: 1fr;
    }

    .image-gallery img {
        width: 100%;
        height: auto;
    }
}

/* 按钮样式 */
.btn {
    background-color: #03A9F4;
    color: #FFFFFF;
    padding: 12px 25px;
    border: none;
    border-radius: 25px;
    cursor: pointer;
    transition: background-color 0.3s ease;
    font-size: 16px;
}

.btn:hover {
    background-color: #FF9800;
}

/* 代码块样式 */
code {
    background-color: #EEEEEE;
    padding: 2px 4px;
    border-radius: 4px;
}

/* 折叠区域样式 */
.collapsible {
    background-color: #FFFFFF;
    color: #03A9F4;
    cursor: pointer;
    padding: 10px;
    width: 100%;
    border: none;
    text-align: left;
    outline: none;
    font-size: 18px;
    transition: background-color 0.3s ease;
}

.collapsible:hover {
    background-color: #F5F5F5;
}

.content {
    padding: 0 18px;
    display: none;
    overflow: hidden;
    background-color: #F9F9F9;
}

/* 动画效果 */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.fade-in {
    animation: fadeIn 2s ease-in;
}

/* 提示信息样式 */
.tip {
    font-size: 20px;
    color: #D32F2F;
    text-align: center;
    margin: 20px 0;
}