/* 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;
}

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

.login-form {
    background: white;
    padding: 40px;
    border-radius: 10px;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
    width: 100%;
    max-width: 400px;
}

.login-form h2 {
    text-align: center;
    margin-bottom: 30px;
    color: #333;
    font-size: 28px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: #555;
}

.form-group input {
    width: 100%;
    padding: 12px;
    border: 2px solid #ddd;
    border-radius: 6px;
    font-size: 16px;
    transition: border-color 0.3s;
}

.form-group input:focus {
    outline: none;
    border-color: #667eea;
}

.btn {
    display: inline-block;
    padding: 12px 24px;
    background: #667eea;
    color: white;
    text-decoration: none;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 16px;
    transition: background 0.3s;
}

.btn:hover {
    background: #5a6fd8;
}

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

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

.btn-success:hover {
    background: #218838;
}

.btn-danger {
    background: #dc3545;
}

.btn-danger:hover {
    background: #c82333;
}

.btn-warning {
    background: #ffc107;
    color: #212529;
}

.btn-warning:hover {
    background: #e0a800;
}

.text-center {
    text-align: center;
}

.mt-3 {
    margin-top: 1rem;
}

/* 消息提示样式 */
.alert {
    padding: 12px 16px;
    margin-bottom: 20px;
    border-radius: 6px;
    font-size: 14px;
}

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

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

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

/* 后台布局样式 */
.admin-header {
    background: white;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    padding: 0;
    margin-bottom: 30px;
}

.admin-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 20px;
    height: 60px;
}

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

.nav-links {
    display: flex;
    list-style: none;
    gap: 20px;
}

.nav-links a {
    text-decoration: none;
    color: #666;
    padding: 8px 16px;
    border-radius: 4px;
    transition: all 0.3s;
}

.nav-links a:hover,
.nav-links a.active {
    background: #667eea;
    color: white;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 15px;
    color: #666;
}

/* 仪表盘样式 */
.dashboard-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background: white;
    padding: 25px;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    text-align: center;
}

.stat-card h3 {
    color: #666;
    font-size: 14px;
    text-transform: uppercase;
    margin-bottom: 10px;
}

.stat-number {
    font-size: 36px;
    font-weight: bold;
    color: #333;
}

.stat-card.visitors .stat-number {
    color: #28a745;
}

.stat-card.spiders .stat-number {
    color: #007bff;
}

.stat-card.domains .stat-number {
    color: #ffc107;
}

/* 表格样式 */
.table-container {
    background: white;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    overflow: hidden;
}

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

.table-header h3 {
    color: #333;
    font-size: 18px;
}

table {
    width: 100%;
    border-collapse: collapse;
}

table th,
table td {
    padding: 12px 20px;
    text-align: left;
    border-bottom: 1px solid #eee;
}

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

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

table td.actions {
    white-space: nowrap;
}

table td.actions a {
    margin-right: 8px;
    padding: 4px 8px;
    font-size: 12px;
    text-decoration: none;
    border-radius: 4px;
}

/* 表单样式 */
.form-container {
    background: white;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    margin-bottom: 30px;
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 20px;
}

.form-group textarea {
    width: 100%;
    min-height: 100px;
    padding: 12px;
    border: 2px solid #ddd;
    border-radius: 6px;
    font-size: 16px;
    resize: vertical;
    font-family: inherit;
}

.form-group select {
    width: 100%;
    padding: 12px;
    border: 2px solid #ddd;
    border-radius: 6px;
    font-size: 16px;
    background: white;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .container {
        padding: 10px;
    }
    
    .admin-nav {
        flex-direction: column;
        height: auto;
        padding: 15px;
    }
    
    .nav-links {
        margin-top: 10px;
        flex-wrap: wrap;
    }
    
    .dashboard-stats {
        grid-template-columns: 1fr;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    table {
        font-size: 14px;
    }
    
    table th,
    table td {
        padding: 8px 12px;
    }
}

/* 加载动画 */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid #f3f3f3;
    border-top: 3px solid #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* 空状态样式 */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: #666;
}

.empty-state h3 {
    margin-bottom: 10px;
    color: #999;
}

.empty-state p {
    margin-bottom: 20px;
}