/* ============================================
   CMS后台管理系统 - 公共样式
   ============================================ */

:root {
    --primary-color: #667eea;
    --primary-hover: #5568d3;
    --success-color: #48bb78;
    --danger-color: #f56565;
    --warning-color: #ed8936;
    --info-color: #4299e1;
    --dark-color: #2d3748;
    --gray-color: #718096;
    --light-gray: #e2e8f0;
    --bg-color: #f7fafc;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--dark-color);
    line-height: 1.6;
}

/* 登录页面 */
.login-wrapper {
    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: 12px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.2);
    width: 100%;
    max-width: 400px;
}

.login-box h1 {
    text-align: center;
    color: var(--primary-color);
    margin-bottom: 30px;
    font-size: 28px;
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--dark-color);
}

.form-control {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid var(--light-gray);
    border-radius: 6px;
    font-size: 14px;
    transition: border-color 0.3s;
}

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

textarea.form-control {
    min-height: 150px;
    resize: vertical;
}

/* 按钮样式 */
.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s;
    display: inline-block;
    text-decoration: none;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background: var(--primary-hover);
    color: white;
}

.btn-success {
    background: var(--success-color);
    color: white;
}

.btn-danger {
    background: var(--danger-color);
    color: white;
}

.btn-warning {
    background: var(--warning-color);
    color: white;
}

.btn-info {
    background: #17a2b8;
    color: white;
}

.btn-info:hover {
    background: #138496;
    color: white;
}

.btn-default {
    background: var(--light-gray);
    color: var(--dark-color);
}

.btn-block {
    display: block;
    width: 100%;
}

.btn-sm {
    padding: 6px 12px;
    font-size: 12px;
}

/* 后台布局 */
.admin-layout {
    display: flex;
    min-height: 100vh;
}

/* 侧边栏 */
.sidebar {
    width: 240px;
    background: linear-gradient(180deg, #2d3748 0%, #1a202c 100%);
    color: white;
    position: fixed;
    height: 100vh;
    overflow-y: auto;
}

.sidebar-header {
    padding: 20px;
    background: rgba(0,0,0,0.2);
    text-align: center;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.sidebar-header h2 {
    font-size: 20px;
    margin-bottom: 5px;
}

.sidebar-header span {
    font-size: 12px;
    color: rgba(255,255,255,0.6);
}

.sidebar-menu {
    padding: 20px 0;
}

.menu-section {
    margin-bottom: 10px;
}

.menu-section-title {
    padding: 10px 20px;
    font-size: 12px;
    color: rgba(255,255,255,0.5);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.menu-item {
    display: block;
    padding: 12px 20px;
    color: rgba(255,255,255,0.8);
    text-decoration: none;
    transition: all 0.3s;
    border-left: 3px solid transparent;
}

.menu-item:hover, .menu-item.active {
    background: rgba(255,255,255,0.1);
    color: white;
    border-left-color: var(--primary-color);
}

.menu-item i {
    margin-right: 10px;
    width: 20px;
    text-align: center;
}

/* 主内容区 */
.main-content {
    flex: 1;
    margin-left: 240px;
    padding: 20px;
}

/* 头部 */
.admin-header {
    background: white;
    padding: 15px 25px;
    border-radius: 8px;
    margin-bottom: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

.admin-header h3 {
    font-size: 18px;
    color: var(--dark-color);
}

.admin-user {
    display: flex;
    align-items: center;
    gap: 15px;
}

.admin-user a {
    color: var(--gray-color);
    text-decoration: none;
    font-size: 14px;
}

.admin-user a:hover {
    color: var(--danger-color);
}

/* 内容卡片 */
.content-card {
    background: white;
    border-radius: 8px;
    padding: 25px;
    margin-bottom: 20px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--light-gray);
}

.card-header h4 {
    font-size: 16px;
    color: var(--dark-color);
}

/* 表格样式 */
.table-wrapper {
    overflow-x: auto;
}

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

th, td {
    padding: 12px 15px;
    text-align: left;
    border-bottom: 1px solid var(--light-gray);
}

th {
    background: var(--bg-color);
    font-weight: 600;
    color: var(--dark-color);
    font-size: 14px;
}

tr:hover {
    background: #f8f9fa;
}

.table-actions {
    display: flex;
    gap: 8px;
}

/* 状态标签 */
.badge {
    display: inline-block;
    padding: 4px 10px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 500;
}

.badge-success {
    background: rgba(72, 187, 120, 0.1);
    color: var(--success-color);
}

.badge-danger {
    background: rgba(245, 101, 101, 0.1);
    color: var(--danger-color);
}

.badge-warning {
    background: rgba(237, 137, 54, 0.1);
    color: var(--warning-color);
}

.badge-info {
    background: rgba(66, 153, 225, 0.1);
    color: var(--info-color);
}

/* 分页 */
.pagination {
    display: flex;
    gap: 5px;
    justify-content: center;
    margin-top: 20px;
}

.pagination a, .pagination span {
    padding: 8px 12px;
    border: 1px solid var(--light-gray);
    border-radius: 4px;
    color: var(--dark-color);
    text-decoration: none;
    font-size: 14px;
}

.pagination a:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.pagination .current {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

/* 搜索表单 */
.search-form {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.search-form .form-group {
    margin-bottom: 0;
}

.search-form .form-control {
    min-width: 200px;
}

/* 提示消息 */
.alert {
    padding: 15px 20px;
    border-radius: 6px;
    margin-bottom: 20px;
}

.alert-success {
    background: rgba(72, 187, 120, 0.1);
    color: var(--success-color);
    border: 1px solid var(--success-color);
}

.alert-danger {
    background: rgba(245, 101, 101, 0.1);
    color: var(--danger-color);
    border: 1px solid var(--danger-color);
}

/* 图片预览 */
.thumbnail {
    width: 80px;
    height: 60px;
    object-fit: cover;
    border-radius: 4px;
}

/* 响应式 */
@media (max-width: 768px) {
    .sidebar {
        width: 60px;
    }
    
    .sidebar-header h2, .sidebar-header span,
    .menu-section-title, .menu-item span {
        display: none;
    }
    
    .menu-item {
        padding: 15px;
        text-align: center;
    }
    
    .menu-item i {
        margin: 0;
        font-size: 18px;
    }
    
    .main-content {
        margin-left: 60px;
    }
}