/* 颜色变量定义 */
:root {
    --primary-color: #002B5B; /* 深蓝色作为主色调 */
    --background-color: #F5F5F5; /* 浅灰色背景 */
    --accent-color-orange: #FFA500; /* 橙色作为点缀色 */
    --accent-color-green: #32CD32; /* 绿色作为点缀色 */
    --text-color: #333333; /* 文字主色 */
    --border-color: #E0E0E0; /* 边框颜色 */
}

/* 全局样式 */
body {
    margin: 0;
    font-family: 'Helvetica', 'Roboto', sans-serif;
    color: var(--text-color);
    line-height: 1.6;
    background-color: var(--background-color);
}

/* 导航栏样式 */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background-color: var(--primary-color);
    color: #FFFFFF;
    display: flex;
    justify-content: space-around;
    align-items: center;
    padding: 15px 0;
    z-index: 1000;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.navbar a {
    color: #FFFFFF;
    text-decoration: none;
    font-size: 16px;
    transition: color 0.3s ease;
}

.navbar a:hover {
    color: var(--accent-color-orange);
}

/* 主容器样式 */
.container {
    max-width: 1200px;
    margin: 100px auto 50px;
    padding: 20px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
    gap: 40px;
}

/* 文章样式 */
article {
    background-color: #FFFFFF;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

article h2, article h3 {
    color: var(--primary-color);
}

article h2 {
    font-size: 24px;
    margin-bottom: 20px;
}

article h3 {
    font-size: 20px;
    margin-top: 30px;
    margin-bottom: 15px;
}

article p {
    font-size: 16px;
    margin-bottom: 15px;
}

/* 代码块样式 */
pre {
    background-color: #F0F0F0;
    padding: 15px;
    border-radius: 5px;
    overflow-x: auto;
}

code {
    font-family: 'Courier New', Courier, monospace;
    color: #D14;
}

/* 图片样式 */
img.decorative {
    width: 320px;
    height: 320px;
    object-fit: cover;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

img.decorative:hover {
    transform: scale(1.05);
    box-shadow: 0 8px 16px rgba(0,0,0,0.2);
}

/* 响应式调整 */
@media (max-width: 768px) {
    .navbar {
        flex-direction: column;
    }
    .container {
        grid-template-columns: 1fr;
    }
    img.decorative {
        width: 100%;
        height: auto;
    }
}

/* 按钮样式 */
.button {
    background-color: var(--accent-color-orange);
    color: #FFFFFF;
    padding: 10px 20px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.3s ease;
    font-size: 16px;
}

.button:hover {
    background-color: #FF8C00;
    transform: translateY(-2px);
}

/* 悬停效果 */
.module:hover {
    box-shadow: 0 8px 16px rgba(0,0,0,0.2);
}

/* 动画效果 */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.fade-in {
    animation: fadeIn 0.6s ease-out forwards;
    opacity: 0;
}

/* 侧边导航样式 */
.sidebar {
    position: fixed;
    left: 0;
    top: 60px;
    width: 200px;
    height: calc(100% - 60px);
    background-color: #FFFFFF;
    border-right: 1px solid var(--border-color);
    padding: 20px;
    transition: transform 0.3s ease;
}

.sidebar.hidden {
    transform: translateX(-100%);
}

.sidebar a {
    display: block;
    margin-bottom: 15px;
    color: var(--primary-color);
    text-decoration: none;
    font-size: 16px;
    transition: color 0.3s ease;
}

.sidebar a:hover {
    color: var(--accent-color-green);
}

/* 页脚样式 */
.footer {
    background-color: var(--primary-color);
    color: #FFFFFF;
    text-align: center;
    padding: 20px 0;
    position: relative;
    bottom: 0;
    width: 100%;
}

/* 过渡效果 */
.transition {
    transition: all 0.3s ease;
}