/* 重置样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* 页面背景和基本样式 */
body {
    font-family: 'Arial', sans-serif;
    background-color: #f7f7f7;
    color: #333;
    line-height: 1.6;
    padding: 0 20px;
}

.container {
    max-width: 900px;
    margin: 50px auto;
    padding: 20px;
    background-color: #fff;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

h1 {
    text-align: center;
    color: #4CAF50;
    margin-bottom: 30px;
}

h2 {
    margin-bottom: 20px;
    color: #333;
}

/* 新增公告表单样式 */
.form-container {
    background-color: #f9f9f9;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
}

input[type="text"], textarea {
    width: 100%;
    padding: 12px;
    margin-bottom: 15px;
    border: 1px solid #ccc;
    border-radius: 4px;
    font-size: 16px;
    box-sizing: border-box;
}

input[type="text"]:focus, textarea:focus {
    outline: none;
    border-color: #4CAF50;
}

button[type="submit"] {
    background-color: #4CAF50;
    color: white;
    padding: 10px 20px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
    transition: background-color 0.3s ease;
}

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

/* 公告列表样式 */
.announcement-list {
    list-style-type: none;
    padding: 0;
    margin-top: 20px;
}

.announcement-list li {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: #fff;
    padding: 15px;
    margin-bottom: 10px;
    border: 1px solid #ddd;
    border-radius: 6px;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
}

.announcement-list a {
    font-weight: bold;
    text-decoration: none;
    color: #333;
}

.announcement-list button {
    background-color: #f44336;
    color: white;
    padding: 6px 12px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    transition: background-color 0.3s ease;
}

.announcement-list button:hover {
    background-color: #d32f2f;
}

.announcement-list button:focus {
    outline: none;
}

/* 居中对齐 */
.text-center {
    text-align: center;
}