/* 前端用户端样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: #f5f7fa;
    color: #333;
    line-height: 1.6;
}

/* 导航栏 */
.navbar {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 0 20px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 60px;
}

.navbar-brand {
    color: white;
    font-size: 20px;
    font-weight: bold;
    text-decoration: none;
}

.navbar-nav {
    display: flex;
    list-style: none;
    gap: 5px;
}

.navbar-nav a {
    color: rgba(255,255,255,0.9);
    text-decoration: none;
    padding: 8px 15px;
    border-radius: 5px;
    transition: all 0.3s;
    font-size: 14px;
}

.navbar-nav a:hover,
.navbar-nav a.active {
    background: rgba(255,255,255,0.2);
    color: white;
}

/* 消息徽章 */
.message-badge {
    background: #e74c3c;
    color: white;
    padding: 2px 6px;
    border-radius: 10px;
    font-size: 11px;
    margin-left: 5px;
    display: inline-block;
    min-width: 18px;
    text-align: center;
}

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

/* 卡片 */
.card {
    background: white;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    margin-bottom: 20px;
}

.card-header {
    padding: 15px 20px;
    border-bottom: 1px solid #eee;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.card-header h3 {
    font-size: 16px;
    color: #333;
}

.card-body {
    padding: 20px;
}

/* 按钮 */
.btn {
    display: inline-block;
    padding: 10px 20px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 14px;
    text-decoration: none;
    transition: all 0.3s;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102,126,234,0.4);
}

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

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

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

.btn-sm {
    padding: 5px 10px;
    font-size: 12px;
}

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

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: 500;
    color: #555;
}

.form-control {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 14px;
    transition: border-color 0.3s;
}

.form-control:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102,126,234,0.1);
}

/* 表格 */
.table {
    width: 100%;
    border-collapse: collapse;
}

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

.table th {
    background: #f8f9fa;
    font-weight: 600;
    color: #555;
}

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

/* 登录页面 */
.login-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.login-box {
    background: white;
    padding: 40px;
    border-radius: 10px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.2);
    width: 100%;
    max-width: 400px;
}

.login-box h2 {
    text-align: center;
    margin-bottom: 30px;
    color: #333;
}

.login-box .btn {
    width: 100%;
    padding: 12px;
}

.login-links {
    text-align: center;
    margin-top: 20px;
}

.login-links a {
    color: #667eea;
    text-decoration: none;
}

.login-footer {
    text-align: center;
    margin-top: 20px;
    padding-top: 15px;
    border-top: 1px solid #e9ecef;
    font-size: 12px;
    color: #999;
}

.login-footer p {
    margin: 5px 0;
}

.icp-footer {
    text-align: center;
    padding: 20px;
    font-size: 12px;
    color: #999;
}

.icp-footer a {
    color: #999;
    text-decoration: none;
}

.icp-footer a:hover {
    color: #666;
}

/* 消息列表 */
.message-item {
    padding: 15px 20px;
    border-bottom: 1px solid #eee;
    cursor: pointer;
    transition: background 0.3s;
}

.message-item:hover {
    background: #f8f9fa;
}

.message-item.unread {
    background: #f0f7ff;
}

.message-item .message-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 8px;
}

.message-item .message-type {
    font-weight: 600;
    color: #667eea;
}

.message-item .message-time {
    color: #999;
    font-size: 12px;
}

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

.message-item .new-badge {
    background: #e74c3c;
    color: white;
    font-size: 10px;
    padding: 2px 6px;
    border-radius: 10px;
    margin-left: 8px;
}

/* 空状态 */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: #999;
}

.empty-state p {
    margin-top: 10px;
}

/* 提示信息 */
.alert {
    padding: 15px;
    border-radius: 5px;
    margin-bottom: 20px;
}

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

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

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

/* 统计卡片 */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 20px;
}

.stat-card {
    background: white;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    text-align: center;
}

.stat-card h4 {
    color: #666;
    font-size: 14px;
    margin-bottom: 10px;
}

.stat-card .stat-number {
    font-size: 28px;
    font-weight: bold;
    color: #667eea;
}

/* 响应式 */
@media (max-width: 768px) {
    .navbar-container {
        flex-direction: column;
        height: auto;
        padding: 10px 0;
    }
    
    .navbar-nav {
        flex-wrap: wrap;
        justify-content: center;
        margin-top: 10px;
    }
    
    .container {
        padding: 10px;
    }
}

/* 前端底部版权 */
.frontend-footer {
    text-align: center;
    padding: 30px 20px;
    margin-top: 30px;
    border-top: 1px solid #e9ecef;
    font-size: 12px;
    color: #999;
}

.frontend-footer p {
    margin: 5px 0;
}