/* 页面的基本样式 */
body, h1, h2, h3, p, ul, li, form, input, button, a {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Arial', sans-serif;
}

body {
    background-color: #f7f7f7;
    color: #333;
    line-height: 1.6;
    padding: 20px;
}

/* 侧边栏和主内容区域 */
.main {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    justify-content: center;
}

/* 侧边导航栏 */
.sidebar {
    background: #333;
    color: white;
    padding: 20px;
    flex: 1;
    min-width: 200px;
}

.sidebar a {
    color: #fff;
    text-decoration: none;
    padding: 10px;
    display: block;
    background: #444;
    border-radius: 5px;
    transition: background 0.3s;
}

.sidebar a:hover {
    background: #555;
}

/* 主内容区域 */
.content {
    flex: 3;
    min-width: 300px;
    background: #fff;
    padding: 20px;
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.2);
}

.content-section {
    margin-bottom: 20px;
}

/* 表单样式 */
label, input[type=text], input[type=password], input[type=submit] {
    display: block;
    width: 100%;
    margin: 10px 0;
}

input[type=text], input[type=password] {
    padding: 8px;
    border: 1px solid #ccc;
    border-radius: 4px;
}

input[type=submit] {
    background-color: #4CAF50;
    color: white;
    padding: 10px 15px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}

input[type=submit]:hover {
    background-color: #45a049;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .main {
        flex-direction: column;
    }
    .sidebar {
        margin-bottom: 20px;
    }
    .content {
        width: 100%;
    }
}

.text-highlight {
    color: #d35400;
    font-weight: bold;
    text-shadow: 1px 1px 1px #ccc;
  }
  
  .small-text {
    font-size: 0.8em;
  }
  
  .uppercase-text {
    text-transform: uppercase;
  }