/**
 * 南乔牧音乐电台 - 后台管理系统样式
 */

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

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

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

/* 侧边栏 */
.sidebar {
    width: 260px;
    background: linear-gradient(180deg, #1a1a2e 0%, #16213e 100%);
    color: white;
    display: flex;
    flex-direction: column;
    position: fixed;
    height: 100vh;
    overflow-y: auto;
}

.sidebar-header {
    padding: 30px 20px;
    text-align: center;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.sidebar-header .logo {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 50%;
    margin: 0 auto 15px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
}

.sidebar-header h2 {
    font-size: 18px;
    font-weight: 500;
}

.sidebar-nav {
    flex: 1;
    padding: 20px 0;
}

.sidebar-nav a {
    display: flex;
    align-items: center;
    padding: 15px 25px;
    color: rgba(255,255,255,0.7);
    text-decoration: none;
    transition: all 0.3s;
    border-left: 3px solid transparent;
}

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

.sidebar-nav a.active {
    background: rgba(102, 126, 234, 0.2);
    color: white;
    border-left-color: #667eea;
}

.sidebar-nav .icon {
    margin-right: 12px;
    font-size: 18px;
}

.sidebar-footer {
    padding: 20px;
    border-top: 1px solid rgba(255,255,255,0.1);
}

.logout-btn {
    display: flex;
    align-items: center;
    padding: 12px 20px;
    background: rgba(255,255,255,0.1);
    color: white;
    text-decoration: none;
    border-radius: 8px;
    transition: background 0.3s;
}

.logout-btn:hover {
    background: rgba(255,255,255,0.2);
}

/* 主内容区 */
.main-content {
    flex: 1;
    margin-left: 260px;
    min-height: 100vh;
}

.main-header {
    background: white;
    padding: 20px 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    position: sticky;
    top: 0;
    z-index: 100;
}

.main-header h1 {
    font-size: 24px;
    font-weight: 600;
}

.user-info {
    color: #666;
    font-size: 14px;
}

.content {
    padding: 30px;
}

/* 统计卡片 */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background: white;
    border-radius: 12px;
    padding: 25px;
    display: flex;
    align-items: center;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    transition: transform 0.3s, box-shadow 0.3s;
}

.stat-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.1);
}

.stat-icon {
    width: 60px;
    height: 60px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    margin-right: 15px;
}

.stat-icon.songs { background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); }
.stat-icon.artists { background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%); }
.stat-icon.categories { background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%); }
.stat-icon.playlists { background: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%); }
.stat-icon.plays { background: linear-gradient(135deg, #fa709a 0%, #fee140 100%); }

.stat-info h3 {
    font-size: 28px;
    font-weight: 700;
    color: #333;
}

.stat-info p {
    color: #666;
    font-size: 14px;
}

/* 快捷操作 */
.quick-actions {
    background: white;
    border-radius: 12px;
    padding: 25px;
    margin-bottom: 30px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.quick-actions h2 {
    font-size: 18px;
    margin-bottom: 20px;
    color: #333;
}

.action-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
}

.action-btn {
    display: flex;
    align-items: center;
    padding: 12px 24px;
    background: #f5f7fa;
    color: #333;
    text-decoration: none;
    border-radius: 8px;
    transition: all 0.3s;
    font-size: 14px;
}

.action-btn:hover {
    background: #e8ecf1;
    transform: translateY(-2px);
}

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

.action-btn.primary:hover {
    box-shadow: 0 8px 20px rgba(102, 126, 234, 0.4);
}

.action-btn .icon {
    margin-right: 8px;
    font-size: 16px;
}

/* 数据区域 */
.data-sections {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 30px;
}

.data-section {
    background: white;
    border-radius: 12px;
    padding: 25px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.data-section h2 {
    font-size: 18px;
    margin-bottom: 20px;
    color: #333;
}

/* 歌曲列表 */
.song-list {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.song-item {
    display: flex;
    align-items: center;
    padding: 12px;
    background: #f8f9fa;
    border-radius: 8px;
    transition: background 0.3s;
}

.song-item:hover {
    background: #e8ecf1;
}

.song-cover {
    width: 50px;
    height: 50px;
    border-radius: 6px;
    object-fit: cover;
    margin-right: 15px;
}

.song-info {
    flex: 1;
}

.song-info h4 {
    font-size: 14px;
    font-weight: 500;
    color: #333;
    margin-bottom: 4px;
}

.song-info p {
    font-size: 12px;
    color: #666;
}

.song-meta {
    text-align: right;
}

.play-count {
    display: block;
    font-size: 12px;
    color: #667eea;
    margin-bottom: 4px;
}

.date {
    font-size: 11px;
    color: #999;
}

/* 页面标题栏 */
.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
}

.page-header h2 {
    font-size: 24px;
    font-weight: 600;
}

/* 按钮 */
.btn {
    display: inline-flex;
    align-items: center;
    padding: 10px 20px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    border: none;
    transition: all 0.3s;
}

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

.btn-primary:hover {
    box-shadow: 0 8px 20px rgba(102, 126, 234, 0.4);
    transform: translateY(-2px);
}

.btn-secondary {
    background: #f5f7fa;
    color: #333;
}

.btn-secondary:hover {
    background: #e8ecf1;
}

.btn-danger {
    background: #ff4757;
    color: white;
}

.btn-danger:hover {
    background: #ff3344;
}

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

/* 表格 */
.data-table {
    width: 100%;
    background: white;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.table-header {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr 120px;
    padding: 15px 20px;
    background: #f8f9fa;
    font-weight: 600;
    font-size: 14px;
    color: #666;
}

.table-row {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr 120px;
    padding: 15px 20px;
    border-top: 1px solid #eee;
    align-items: center;
    font-size: 14px;
}

.table-row:hover {
    background: #f8f9fa;
}

.table-cell {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

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

.cell-actions a {
    padding: 4px 10px;
    border-radius: 4px;
    font-size: 12px;
    text-decoration: none;
    transition: all 0.3s;
}

.cell-actions .edit {
    background: #e3f2fd;
    color: #1976d2;
}

.cell-actions .edit:hover {
    background: #1976d2;
    color: white;
}

.cell-actions .delete {
    background: #ffebee;
    color: #d32f2f;
}

.cell-actions .delete:hover {
    background: #d32f2f;
    color: white;
}

/* 表单 */
.form-container {
    max-width: 800px;
    background: white;
    border-radius: 12px;
    padding: 30px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-size: 14px;
    font-weight: 500;
    color: #333;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 14px;
    transition: border-color 0.3s;
    font-family: inherit;
}

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

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

.form-group .help-text {
    font-size: 12px;
    color: #666;
    margin-top: 6px;
}

/* 文件上传 */
.file-upload {
    border: 2px dashed #ddd;
    border-radius: 8px;
    padding: 30px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s;
}

.file-upload:hover {
    border-color: #667eea;
    background: #f8f9ff;
}

.file-upload input {
    display: none;
}

.file-upload .icon {
    font-size: 48px;
    margin-bottom: 10px;
}

.file-upload p {
    color: #666;
    font-size: 14px;
}

/* 搜索框 */
.search-box {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
}

.search-box input {
    flex: 1;
    padding: 12px 15px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 14px;
}

.search-box button {
    padding: 12px 24px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 14px;
}

/* 分页 */
.pagination {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-top: 30px;
}

.pagination a,
.pagination span {
    padding: 8px 14px;
    border-radius: 6px;
    font-size: 14px;
    text-decoration: none;
    transition: all 0.3s;
}

.pagination a {
    background: white;
    color: #333;
    border: 1px solid #ddd;
}

.pagination a:hover {
    background: #667eea;
    color: white;
    border-color: #667eea;
}

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

/* 消息提示 */
.alert {
    padding: 15px 20px;
    border-radius: 8px;
    margin-bottom: 20px;
    font-size: 14px;
}

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

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

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

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

.empty-state .icon {
    font-size: 64px;
    margin-bottom: 20px;
    opacity: 0.5;
}

.empty-state h3 {
    font-size: 18px;
    margin-bottom: 10px;
    color: #333;
}

.empty-state p {
    font-size: 14px;
    margin-bottom: 20px;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .sidebar {
        width: 100%;
        position: relative;
        height: auto;
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .admin-wrapper {
        flex-direction: column;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .data-sections {
        grid-template-columns: 1fr;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .table-header,
    .table-row {
        grid-template-columns: 1fr;
        gap: 10px;
    }
    
    .table-header {
        display: none;
    }
}