/* 整体页面布局 */
body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f4;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    padding: 0;
}

/* 留言板容器样式 */
.message-board-container {
    width: 600px;
    background-color: white;
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    overflow: hidden;
}

/* 标题样式 */
.board-title {
    text-align: center;
    padding: 20px;
    background-color: #3498db;
    color: white;
    margin: 0;
    font-size: 28px;
}

/* 表单样式 */
.message-form {
    padding: 20px;
}

.form-group {
    margin-bottom: 15px;
}

label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
}

input,
textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 5px;
    box-sizing: border-box;
}

textarea {
    resize: vertical;
    min-height: 100px;
}

.submit-button {
    background-color: #2ecc71;
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 16px;
    transition: background-color 0.3s ease;
}

.submit-button:hover {
    background-color: #27ae60;
}

/* 留言容器样式 */
.messages-container {
    padding: 20px;
}

/* 单个留言样式 */
.message {
    border: 1px solid #ccc;
    border-radius: 5px;
    padding: 15px;
    margin-bottom: 15px;
    background-color: #f9f9f9;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.message:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 10px rgba(0, 0, 0, 0.1);
}

.message-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.message-header.username {
    font-weight: bold;
    font-size: 18px;
    color: #333;
}

.message-header.timestamp {
    font-size: 14px;
    color: #999;
}

.message-content {
    font-size: 16px;
    color: #555;
    line-height: 1.5;
}