/* 基础样式设置 */
body {
    margin: 0;
    padding: 0;
    font-family: 'Roboto Bold', 'Helvetica Neue', sans-serif;
    background: linear-gradient(135deg, #173E32, #0E245B);
    color: #FFFFFF;
    line-height: 1.6;
}

/* 顶部导航栏样式 */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: rgba(23, 62, 50, 0.9);
    padding: 15px 30px;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

/* 导航链接样式 */
.navbar a {
    color: #FFFFFF;
    text-decoration: none;
    margin: 0 15px;
    transition: color 0.3s ease;
}

.navbar a:hover {
    color: #FF8C00;
}

/* 侧边栏样式 */
.sidebar {
    position: fixed;
    top: 60px;
    left: 0;
    width: 200px;
    height: calc(100% - 60px);
    background-color: rgba(23, 62, 50, 0.9);
    padding: 20px;
    box-shadow: 2px 0 5px rgba(0, 0, 0, 0.1);
}

.sidebar a {
    display: block;
    color: #FFFFFF;
    text-decoration: none;
    margin-bottom: 20px;
    transition: color 0.3s ease;
}

.sidebar a:hover {
    color: #34C759;
}

/* 主内容区样式 */
.main-content {
    margin-left: 220px;
    padding: 80px 30px 30px 30px;
    background: linear-gradient(135deg, #0E245B, #173E32);
    min-height: 100vh;
}

/* 模块化布局容器 */
.container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
    padding: 20px;
}

/* 卡片式设计样式 */
.card {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    padding: 20px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
}

/* 图片样式 */
.card img {
    width: 100%;
    border-radius: 8px;
    margin-bottom: 15px;
}

/* 标题样式 */
h2, h3, h4 {
    color: #FFFFFF;
    margin-bottom: 10px;
}

h2 {
    font-size: 24px;
}

h3 {
    font-size: 20px;
}

h4 {
    font-size: 18px;
}

/* 段落样式 */
p {
    font-size: 16px;
    color: #D3D3D3;
}

/* 按钮样式 */
.button {
    display: inline-block;
    padding: 10px 20px;
    background-color: #FF8C00;
    color: #FFFFFF;
    border: none;
    border-radius: 5px;
    text-decoration: none;
    transition: background-color 0.3s ease;
}

.button:hover {
    background-color: #34C759;
}

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

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

/* 响应式设计 */
@media (max-width: 768px) {
    .navbar {
        flex-direction: column;
        align-items: flex-start;
    }

    .sidebar {
        width: 100%;
        height: auto;
        position: relative;
        box-shadow: none;
    }

    .main-content {
        margin: 0;
        padding: 100px 20px 20px 20px;
    }

    .container {
        grid-template-columns: 1fr;
    }
}

/* 提示文本样式 */
.notice {
    text-align: center;
    font-size: 18px;
    margin: 20px 0;
    color: #FF8C00;
    font-weight: bold;
}