/* 基础变量 */
:root {
    --primary-color: #ff6b9d;
    --primary-light: #ffe4ed;
    --primary-dark: #e91e63;
    --sidebar-bg: #1a1a2e;
    --sidebar-hover: #252542;
    --sidebar-active: #ff6b9d;
    --header-bg: #fff;
    --content-bg: #f5f7fa;
    --text-primary: #1a1a2e;
    --text-secondary: #6b7280;
    --text-light: #9ca3af;
    --border-color: #e5e7eb;
    --card-bg: #fff;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --transition: all 0.3s ease;
}

/* 重置样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    font-size: 14px;
    color: var(--text-primary);
    background: var(--content-bg);
    line-height: 1.5;
}

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

/* 侧边栏 */
.sidebar {
    width: 240px;
    background: var(--sidebar-bg);
    display: flex;
    flex-direction: column;
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    z-index: 100;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    color: #fff;
    font-size: 18px;
    font-weight: 600;
}

.logo i {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
}

.sidebar-nav {
    flex: 1;
    padding: 16px 12px;
    overflow-y: auto;
}

.nav-list {
    list-style: none;
}

.nav-item {
    margin-bottom: 4px;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.nav-link:hover {
    background: var(--sidebar-hover);
    color: #fff;
}

.nav-item.active .nav-link {
    background: var(--sidebar-active);
    color: #fff;
}

.nav-link i {
    width: 20px;
    font-size: 16px;
    text-align: center;
}

.sidebar-footer {
    padding: 16px 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.version {
    color: rgba(255, 255, 255, 0.4);
    font-size: 12px;
}

/* 主内容区 */
.main-content {
    flex: 1;
    margin-left: 240px;
    display: flex;
    flex-direction: column;
}

/* 顶部栏 */
.top-header {
    height: 64px;
    background: var(--header-bg);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 32px;
    position: sticky;
    top: 0;
    z-index: 50;
}

.page-title {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.btn-link {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--primary-color);
    text-decoration: none;
    font-size: 14px;
    transition: var(--transition);
}

.btn-link:hover {
    color: var(--primary-dark);
}

/* 内容区 */
.content-wrapper {
    flex: 1;
    padding: 24px 32px;
    overflow-y: auto;
}

/* 页面切换 */
.page {
    display: none;
}

.page.active {
    display: block;
}

/* 操作栏 */
.action-bar {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 24px;
    background: var(--card-bg);
    padding: 16px 20px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.search-box {
    flex: 1;
    position: relative;
    max-width: 300px;
}

.search-box i {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-light);
}

.search-box input {
    width: 100%;
    padding: 10px 12px 10px 40px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 14px;
    transition: var(--transition);
}

.search-box input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.filter-group {
    display: flex;
    gap: 12px;
}

.filter-select,
.filter-date {
    padding: 10px 14px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 14px;
    background: #fff;
    cursor: pointer;
    transition: var(--transition);
}

.filter-select:focus,
.filter-date:focus {
    outline: none;
    border-color: var(--primary-color);
}

/* 按钮 */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    border: none;
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: #fff;
}

.btn-primary:hover {
    opacity: 0.9;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.btn-secondary {
    background: var(--border-color);
    color: var(--text-primary);
}

.btn-secondary:hover {
    background: #d1d5db;
}

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

.btn-icon {
    padding: 8px;
    background: transparent;
    color: var(--text-secondary);
}

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

/* 表格 */
.table-container {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

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

.data-table th,
.data-table td {
    padding: 14px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.data-table th {
    background: #f9fafb;
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.data-table tbody tr:hover {
    background: #f9fafb;
}

.data-table tbody tr:last-child td {
    border-bottom: none;
}

.topic-title {
    font-weight: 500;
    color: var(--text-primary);
}

.category-tag {
    display: inline-block;
    padding: 4px 12px;
    background: var(--primary-light);
    color: var(--primary-color);
    border-radius: 20px;
    font-size: 12px;
    font-weight: 500;
}

/* 分页 */
.pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin-top: 24px;
}

.page-btn {
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    background: #fff;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    color: var(--text-secondary);
}

.page-btn:hover:not(:disabled) {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.page-btn.active {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: #fff;
}

.page-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* 统计卡片 */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    margin-bottom: 32px;
}

.stat-card {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    padding: 24px;
    display: flex;
    align-items: center;
    gap: 16px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.stat-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
}

.stat-icon.blue {
    background: #eff6ff;
    color: #3b82f6;
}

.stat-icon.pink {
    background: var(--primary-light);
    color: var(--primary-color);
}

.stat-icon.purple {
    background: #f3e8ff;
    color: #9333ea;
}

.stat-icon.orange {
    background: #fff7ed;
    color: #f97316;
}

.stat-value {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1;
    margin-bottom: 4px;
}

.stat-label {
    font-size: 14px;
    color: var(--text-secondary);
}

/* 图表区域 */
.chart-section {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    padding: 24px;
    margin-bottom: 24px;
    box-shadow: var(--shadow-sm);
}

.section-title {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.chart-container {
    min-height: 300px;
}

/* 图表条 */
.chart-bar-item {
    display: flex;
    align-items: center;
    margin-bottom: 16px;
}

.chart-bar-label {
    width: 100px;
    font-size: 14px;
    color: var(--text-secondary);
}

.chart-bar-wrapper {
    flex: 1;
    height: 24px;
    background: var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    margin: 0 16px;
}

.chart-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-dark));
    border-radius: 12px;
    transition: width 0.5s ease;
}

.chart-bar-value {
    width: 60px;
    text-align: right;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
}

/* 趋势图 */
.trend-chart {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    height: 200px;
    padding: 20px 0;
}

.trend-bar-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    padding: 0 4px;
}

.trend-bar {
    width: 100%;
    max-width: 30px;
    background: linear-gradient(to top, var(--primary-color), var(--primary-light));
    border-radius: 4px 4px 0 0;
    transition: height 0.3s ease;
}

.trend-bar-label {
    font-size: 12px;
    color: var(--text-light);
    transform: rotate(-45deg);
    white-space: nowrap;
}

/* 弹框 */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal.show {
    display: flex;
}

.modal-content {
    background: #fff;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    width: 90%;
    max-width: 600px;
    animation: modalIn 0.3s ease;
}

@keyframes modalIn {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h3 {
    font-size: 18px;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 10px;
}

.modal-close {
    width: 32px;
    height: 32px;
    border: none;
    background: transparent;
    color: var(--text-light);
    font-size: 24px;
    cursor: pointer;
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.modal-close:hover {
    background: var(--border-color);
    color: var(--text-primary);
}

.modal-body {
    padding: 24px;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    padding: 16px 24px;
    border-top: 1px solid var(--border-color);
}

/* 上传区域 */
.upload-area {
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-lg);
    padding: 48px 24px;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
}

.upload-area:hover {
    border-color: var(--primary-color);
    background: var(--primary-light);
}

.upload-area i {
    font-size: 48px;
    color: var(--primary-color);
    margin-bottom: 16px;
}

.upload-area p {
    font-size: 16px;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.upload-hint {
    font-size: 12px;
    color: var(--text-light);
}

.file-info {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px;
    background: var(--primary-light);
    border-radius: var(--radius-md);
}

.file-info i {
    font-size: 24px;
    color: #22c55e;
}

.file-info span {
    flex: 1;
    font-size: 14px;
    color: var(--text-primary);
}

.btn-remove {
    width: 28px;
    height: 28px;
    border: none;
    background: rgba(239, 68, 68, 0.1);
    color: #ef4444;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
}

.btn-remove:hover {
    background: rgba(239, 68, 68, 0.2);
}

/* Toast */
.toast {
    position: fixed;
    top: 24px;
    right: 24px;
    display: none;
    align-items: center;
    gap: 12px;
    padding: 16px 24px;
    background: #fff;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    z-index: 2000;
    animation: toastIn 0.3s ease;
}

.toast.show {
    display: flex;
}

.toast i {
    font-size: 20px;
    color: #22c55e;
}

@keyframes toastIn {
    from {
        opacity: 0;
        transform: translateX(100%);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* 空状态 */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-light);
}

.empty-state i {
    font-size: 48px;
    margin-bottom: 16px;
}

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

/* 编辑表单样式 */
.edit-form .form-group {
    margin-bottom: 16px;
}

.edit-form .form-label {
    display: block;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

.edit-form .form-input,
.edit-form .form-textarea,
.edit-form .form-select {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 14px;
    color: var(--text-primary);
    background: #fff;
    transition: var(--transition);
}

.edit-form .form-input:focus,
.edit-form .form-textarea:focus,
.edit-form .form-select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(255, 182, 193, 0.15);
}

.edit-form .form-textarea {
    resize: vertical;
    min-height: 80px;
}

.edit-form .form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

/* 响应式 */
@media (max-width: 1200px) {
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .sidebar {
        width: 70px;
    }
    
    .logo span,
    .nav-link span,
    .sidebar-footer {
        display: none;
    }
    
    .nav-link {
        justify-content: center;
        padding: 12px;
    }
    
    .main-content {
        margin-left: 70px;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .action-bar {
        flex-wrap: wrap;
    }
    
    .search-box {
        max-width: 100%;
        width: 100%;
    }
    
    .edit-form .form-row {
        grid-template-columns: 1fr;
    }
}