/* 基础样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    font-size: 14px;
    line-height: 1.5;
    color: #333;
    background-color: #f5f7fa;
}

/* 工具类 */
.hidden {
    display: none !important;
}

/* 登录页面 */
#login-page {
    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: 8px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.1);
    width: 100%;
    max-width: 400px;
}

.login-box h1 {
    text-align: center;
    margin-bottom: 30px;
    color: #333;
    font-size: 24px;
}

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

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

.form-group input,
.form-group select {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid #d9d9d9;
    border-radius: 4px;
    font-size: 14px;
    transition: border-color 0.3s;
}

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

.form-group small {
    display: block;
    margin-top: 5px;
    color: #999;
    font-size: 12px;
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 10px 20px;
    border: 1px solid #d9d9d9;
    border-radius: 4px;
    background: white;
    color: #555;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.3s;
}

.btn:hover {
    border-color: #667eea;
    color: #667eea;
}

.btn-primary {
    background: #667eea;
    color: white;
    border-color: #667eea;
}

.btn-primary:hover {
    background: #5568d3;
    color: white;
    border-color: #5568d3;
}

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

.btn-danger {
    background: #ff4d4f;
    color: white;
    border-color: #ff4d4f;
}

.btn-danger:hover {
    background: #ff7875;
    border-color: #ff7875;
    color: white;
}

/* 错误消息 */
.error-message {
    color: #ff4d4f;
    margin-top: 15px;
    text-align: center;
    font-size: 14px;
}

/* 主页面布局 */
#main-page {
    display: flex;
    min-height: 100vh;
}

/* 侧边栏 */
.sidebar {
    width: 220px;
    background: #001529;
    color: white;
    display: flex;
    flex-direction: column;
    position: fixed;
    height: 100vh;
}

.logo {
    padding: 20px;
    font-size: 18px;
    font-weight: bold;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.nav-menu {
    flex: 1;
    padding: 10px 0;
}

.nav-item {
    display: block;
    padding: 12px 20px;
    color: rgba(255,255,255,0.65);
    text-decoration: none;
    transition: all 0.3s;
}

.nav-item:hover {
    color: white;
    background: rgba(255,255,255,0.05);
}

.nav-item.active {
    color: white;
    background: #667eea;
}

.user-info {
    padding: 15px 20px;
    border-top: 1px solid rgba(255,255,255,0.1);
}

.user-info span {
    display: block;
    margin-bottom: 10px;
    color: rgba(255,255,255,0.85);
    font-size: 13px;
}

/* 主内容区 */
.main-content {
    flex: 1;
    margin-left: 220px;
    padding: 20px;
}

/* 页面区块 */
.section {
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.section h2 {
    font-size: 20px;
    color: #333;
}

/* 仪表盘卡片 */
.dashboard-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.card {
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}

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

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

/* 数据表格 */
.data-table {
    width: 100%;
    background: white;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
    border-collapse: collapse;
}

.data-table th,
.data-table td {
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid #f0f0f0;
}

.data-table th {
    background: #fafafa;
    font-weight: 600;
    color: #666;
}

.data-table tbody tr:hover {
    background: #fafafa;
}

.data-table td {
    color: #555;
}

/* 状态标签 */
.status-normal {
    color: #52c41a;
}

.status-disabled {
    color: #ff4d4f;
}

/* 模态框 */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal-content {
    background: white;
    padding: 30px;
    border-radius: 8px;
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-content h3 {
    margin-bottom: 20px;
    font-size: 18px;
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
    margin-top: 25px;
}

/* 充值表单 */
.form-box {
    background: white;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
    max-width: 500px;
}

.form-box h3 {
    margin-bottom: 20px;
    font-size: 18px;
}

/* 响应式 */
@media (max-width: 768px) {
    .sidebar {
        width: 0;
        overflow: hidden;
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .dashboard-cards {
        grid-template-columns: 1fr;
    }
    
    .data-table {
        font-size: 12px;
    }
    
    .data-table th,
    .data-table td {
        padding: 8px 10px;
    }
}