/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: #f5f5f5;
    color: #333;
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* 头部导航 */
.header {
    background: white;
    padding: 15px 20px;
    border-radius: 8px;
    margin-bottom: 20px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
}

.header h1 {
    font-size: 24px;
    color: #333;
}

.header nav {
    display: flex;
    gap: 15px;
    align-items: center;
}

.header nav a {
    color: #007bff;
    text-decoration: none;
    padding: 5px 10px;
    border-radius: 4px;
    transition: background-color 0.3s;
}

.header nav a:hover {
    background-color: #e9ecef;
}

/* 卡片样式 */
.card {
    background: white;
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 15px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

/* 留言卡片 */
.message-card {
    border-left: 4px solid #007bff;
}

.message-card.admin-replied {
    border-left-color: #28a745;
}

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

.message-author {
    font-weight: bold;
    color: #007bff;
}

.message-time {
    color: #666;
    font-size: 14px;
}

.message-content {
    margin: 15px 0;
    line-height: 1.8;
    white-space: pre-wrap;
    word-wrap: break-word;
}

.message-reply {
    background-color: #f8f9fa;
    border-left: 3px solid #28a745;
    padding: 15px;
    margin-top: 15px;
    border-radius: 4px;
}

.message-reply strong {
    color: #28a745;
}

/* 表单样式 */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: 500;
    color: #333;
}

.form-group input[type="text"],
.form-group input[type="password"],
.form-group input[type="email"],
.form-group textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 16px;
    transition: border-color 0.3s;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #007bff;
}

.form-group textarea {
    min-height: 120px;
    resize: vertical;
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 10px 20px;
    background-color: #007bff;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
    text-decoration: none;
    transition: background-color 0.3s;
}

.btn:hover {
    background-color: #0056b3;
}

.btn-success {
    background-color: #28a745;
}

.btn-success:hover {
    background-color: #1e7e34;
}

.btn-danger {
    background-color: #dc3545;
}

.btn-danger:hover {
    background-color: #bd2130;
}

.btn-secondary {
    background-color: #6c757d;
}

.btn-secondary:hover {
    background-color: #545b62;
}

/* 验证码 */
.captcha-group {
    display: flex;
    gap: 10px;
    align-items: flex-start;
}

.captcha-group input {
    flex: 1;
}

.captcha-img {
    cursor: pointer;
    border: 1px solid #ddd;
    border-radius: 4px;
}

/* 状态标签 */
.status-badge {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 500;
}

.status-pending {
    background-color: #ffc107;
    color: #333;
}

.status-approved {
    background-color: #17a2b8;
    color: white;
}

.status-replied {
    background-color: #28a745;
    color: white;
}

/* 表格样式 */
.table {
    width: 100%;
    border-collapse: collapse;
    background: white;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.table th,
.table td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid #ddd;
}

.table th {
    background-color: #f8f9fa;
    font-weight: 600;
}

.table tr:hover {
    background-color: #f8f9fa;
}

/* 筛选标签 */
.filter-tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.filter-tabs a {
    padding: 8px 16px;
    background: white;
    border-radius: 4px;
    text-decoration: none;
    color: #333;
    border: 1px solid #ddd;
    transition: all 0.3s;
}

.filter-tabs a:hover,
.filter-tabs a.active {
    background-color: #007bff;
    color: white;
    border-color: #007bff;
}

/* 提示信息 */
.alert {
    padding: 15px;
    border-radius: 4px;
    margin-bottom: 20px;
}

.alert-success {
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.alert-danger {
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.alert-info {
    background-color: #d1ecf1;
    color: #0c5460;
    border: 1px solid #bee5eb;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .container {
        padding: 10px;
    }
    
    .header {
        flex-direction: column;
        gap: 10px;
        text-align: center;
    }
    
    .header nav {
        justify-content: center;
    }
    
    .message-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .captcha-group {
        flex-direction: column;
    }
    
    .table {
        display: block;
        overflow-x: auto;
    }
    
    .filter-tabs {
        justify-content: center;
    }
}

/* 管理员登录表单 */
.admin-login {
    max-width: 400px;
    margin: 100px auto;
}

/* 操作按钮组 */
.action-buttons {
    display: flex;
    gap: 5px;
    flex-wrap: wrap;
}

.action-buttons .btn {
    padding: 5px 10px;
    font-size: 14px;
}

/* 回复表单 */
.reply-form {
    margin-top: 10px;
}

.reply-form textarea {
    width: 100%;
    min-height: 80px;
    margin-bottom: 10px;
}