/**
 * 学习小达人 - 管理后台样式
 * 小红花主题
 */

/* ==================== CSS 变量 ==================== */
:root {
    /* 主色调 - 小红花主题 */
    --primary: #FF6B6B;
    --primary-light: #FF8E8E;
    --primary-dark: #E55555;
    
    /* 辅助色 */
    --secondary: #4ECDC4;
    --accent: #FFE66D;
    --success: #52C41A;
    --warning: #FAAD14;
    --error: #FF4D4F;
    --info: #1890FF;
    
    /* 背景色 */
    --bg-primary: #FFFAFA;
    --bg-secondary: #FFF5F5;
    --bg-card: #FFFFFF;
    --bg-hover: rgba(255, 107, 107, 0.05);
    
    /* 文字色 */
    --text-primary: #2D3436;
    --text-secondary: #636E72;
    --text-muted: #B2BEC3;
    
    /* 边框和分割线 */
    --border: #FFE4E4;
    --divider: #FFF0F0;
    
    /* 阴影 */
    --shadow-sm: 0 2px 8px rgba(255, 107, 107, 0.08);
    --shadow-md: 0 4px 16px rgba(255, 107, 107, 0.12);
    --shadow-lg: 0 8px 32px rgba(255, 107, 107, 0.16);
    
    /* 圆角 */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    
    /* 间距 */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    
    /* 尺寸 */
    --sidebar-width: 260px;
    --navbar-height: 64px;
    
    /* 过渡 */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s ease;
    --transition-slow: 0.35s ease;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', Helvetica, Arial, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    color: inherit;
    text-decoration: none;
}

button {
    font: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

input, select, textarea {
    font: inherit;
}

/* ==================== 小红花图标 ==================== */
.flower-icon {
    position: relative;
    width: 24px;
    height: 24px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.flower-icon::before {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle, #FFD700 20%, transparent 20%),
                radial-gradient(ellipse 45% 25% at 50% 0%, #FF6B6B 90%, transparent 90%),
                radial-gradient(ellipse 45% 25% at 100% 38%, #FF6B6B 90%, transparent 90%),
                radial-gradient(ellipse 45% 25% at 81% 100%, #FF6B6B 90%, transparent 90%),
                radial-gradient(ellipse 45% 25% at 19% 100%, #FF6B6B 90%, transparent 90%),
                radial-gradient(ellipse 45% 25% at 0% 38%, #FF6B6B 90%, transparent 90%);
    animation: flower-bloom 2s ease-in-out infinite;
}

.flower-icon.small {
    width: 16px;
    height: 16px;
}

.flower-icon.large {
    width: 48px;
    height: 48px;
}

@keyframes flower-bloom {
    0%, 100% { transform: scale(1) rotate(0deg); }
    50% { transform: scale(1.1) rotate(10deg); }
}

/* ==================== 布局 ==================== */
.app-container {
    display: flex;
    min-height: 100vh;
}

/* ==================== 侧边栏 ==================== */
.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    width: var(--sidebar-width);
    background: linear-gradient(180deg, #FFFFFF 0%, #FFF8F8 100%);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    z-index: 100;
    transition: width var(--transition-normal), transform var(--transition-normal);
}

/* 侧边栏收起状态 */
.sidebar.collapsed {
    width: 72px;
}

.sidebar.collapsed .logo-text,
.sidebar.collapsed .nav-link span,
.sidebar.collapsed .version {
    opacity: 0;
    width: 0;
    overflow: hidden;
    white-space: nowrap;
}

.sidebar.collapsed .sidebar-header {
    padding: var(--spacing-md);
    justify-content: center;
}

.sidebar.collapsed .logo {
    justify-content: center;
}

.sidebar.collapsed .sidebar-toggle {
    position: static;
    margin-left: 0;
}

.sidebar.collapsed .sidebar-toggle svg {
    transform: rotate(180deg);
}

.sidebar.collapsed .nav-link {
    justify-content: center;
    padding: var(--spacing-md);
}

.sidebar.collapsed .nav-link svg,
.sidebar.collapsed .nav-link .flower-icon {
    margin: 0;
}

.sidebar.collapsed .sidebar-footer {
    padding: var(--spacing-sm);
}

.sidebar-header {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--divider);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 18px;
    font-weight: 700;
    color: var(--primary);
    flex: 1;
    min-width: 0;
}

.logo-text {
    transition: opacity var(--transition-normal), width var(--transition-normal);
    white-space: nowrap;
}

.sidebar-toggle {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    transition: all var(--transition-fast);
    flex-shrink: 0;
    background: transparent;
    border: none;
    cursor: pointer;
}

.sidebar-toggle:hover {
    background: var(--bg-secondary);
    color: var(--primary);
}

.sidebar-toggle svg {
    width: 18px;
    height: 18px;
    transition: transform var(--transition-normal);
}

.sidebar-nav {
    flex: 1;
    padding: var(--spacing-md);
    overflow-y: auto;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    transition: all var(--transition-fast);
    margin-bottom: var(--spacing-xs);
}

.nav-link svg {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

.nav-link span {
    transition: opacity var(--transition-normal), width var(--transition-normal);
    white-space: nowrap;
}

.nav-link:hover {
    background: var(--bg-hover);
    color: var(--primary);
}

.nav-link.active {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    color: white;
    box-shadow: var(--shadow-sm);
}

.sidebar-footer {
    padding: var(--spacing-md);
    border-top: 1px solid var(--divider);
    text-align: center;
}

.version {
    font-size: 12px;
    color: var(--text-muted);
    transition: opacity var(--transition-normal);
}

/* ==================== 主内容区 ==================== */
.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    transition: margin-left var(--transition-normal);
}

/* 侧边栏收起时主内容区调整 */
.sidebar.collapsed ~ .main-content {
    margin-left: 72px;
}

/* ==================== 顶部导航 ==================== */
.navbar {
    position: sticky;
    top: 0;
    height: var(--navbar-height);
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    padding: 0 var(--spacing-lg);
    z-index: 50;
}

.menu-toggle {
    display: none;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    align-items: center;
    justify-content: center;
    margin-right: var(--spacing-md);
}

.menu-toggle svg {
    width: 24px;
    height: 24px;
    color: var(--text-secondary);
}

.navbar-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
}

.navbar-actions {
    margin-left: auto;
    display: flex;
    gap: var(--spacing-sm);
}

.navbar-btn {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.navbar-btn:hover {
    background: var(--bg-secondary);
    color: var(--primary);
}

.navbar-btn svg {
    width: 20px;
    height: 20px;
}

/* ==================== 页面内容 ==================== */
.page-content {
    flex: 1;
    padding: var(--spacing-lg);
    background: var(--bg-primary);
}

/* ==================== 统计卡片 ==================== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.stat-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-fast);
}

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

.stat-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.stat-icon svg {
    width: 24px;
    height: 24px;
}

.stat-icon.primary {
    background: rgba(255, 107, 107, 0.1);
    color: var(--primary);
}

.stat-icon.secondary {
    background: rgba(78, 205, 196, 0.1);
    color: var(--secondary);
}

.stat-icon.accent {
    background: rgba(255, 230, 109, 0.2);
    color: #E6B800;
}

.stat-icon.success {
    background: rgba(82, 196, 26, 0.1);
    color: var(--success);
}

.stat-icon.info {
    background: rgba(24, 144, 255, 0.1);
    color: var(--info);
}

.stat-content {
    flex: 1;
}

.stat-value {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.2;
}

.stat-label {
    font-size: 14px;
    color: var(--text-muted);
    margin-top: var(--spacing-xs);
}

.stat-change {
    font-size: 12px;
    margin-top: var(--spacing-xs);
}

.stat-change.positive {
    color: var(--success);
}

.stat-change.negative {
    color: var(--error);
}

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

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--divider);
}

.card-title {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
}

.card-actions {
    display: flex;
    gap: var(--spacing-sm);
}

.card-body {
    padding: var(--spacing-lg);
}

.card-footer {
    padding: var(--spacing-md) var(--spacing-lg);
    border-top: 1px solid var(--divider);
    background: var(--bg-secondary);
}

/* ==================== 表格 ==================== */
.table-container {
    overflow-x: auto;
}

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

.data-table th,
.data-table td {
    padding: var(--spacing-md);
    text-align: left;
    border-bottom: 1px solid var(--divider);
}

.data-table th {
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    background: var(--bg-secondary);
}

.data-table tbody tr:hover {
    background: var(--bg-hover);
}

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

/* ==================== 操作按钮 ==================== */
.action-buttons {
    display: flex;
    gap: var(--spacing-xs);
}

.action-btn {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.action-btn svg {
    width: 16px;
    height: 16px;
}

.action-btn.view {
    color: var(--info);
}

.action-btn.view:hover {
    background: rgba(24, 144, 255, 0.1);
}

.action-btn.edit {
    color: var(--warning);
}

.action-btn.edit:hover {
    background: rgba(250, 173, 20, 0.1);
}

.action-btn.delete {
    color: var(--error);
}

.action-btn.delete:hover {
    background: rgba(255, 77, 79, 0.1);
}

/* ==================== 工具栏 ==================== */
.toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.toolbar-left {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.toolbar-right {
    display: flex;
    gap: var(--spacing-sm);
}

.search-box {
    position: relative;
    display: flex;
    align-items: center;
}

.search-box svg {
    position: absolute;
    left: 12px;
    width: 18px;
    height: 18px;
    color: var(--text-muted);
}

.search-input {
    width: 240px;
    padding: 10px 12px 10px 40px;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    background: var(--bg-card);
    transition: all var(--transition-fast);
}

.search-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(255, 107, 107, 0.1);
}

.filter-select {
    padding: 10px 32px 10px 12px;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    background: var(--bg-card) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23636E72' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E") no-repeat right 12px center;
    appearance: none;
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

/* ==================== 按钮 ==================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: 10px 20px;
    border-radius: var(--radius-md);
    font-weight: 500;
    transition: all var(--transition-fast);
}

.btn svg {
    width: 18px;
    height: 18px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    color: white;
    box-shadow: 0 2px 8px rgba(255, 107, 107, 0.3);
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(255, 107, 107, 0.4);
}

.btn-ghost {
    color: var(--text-secondary);
}

.btn-ghost:hover {
    background: var(--bg-secondary);
    color: var(--primary);
}

.btn-block {
    width: 100%;
}

.btn-sm {
    padding: 6px 12px;
    font-size: 13px;
}

/* ==================== 标签 ==================== */
.tag {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 500;
}

.tag.default {
    background: var(--bg-secondary);
    color: var(--text-secondary);
}

.tag.primary {
    background: rgba(255, 107, 107, 0.1);
    color: var(--primary);
}

.tag.success {
    background: rgba(82, 196, 26, 0.1);
    color: var(--success);
}

.tag.warning {
    background: rgba(250, 173, 20, 0.1);
    color: var(--warning);
}

.tag.error {
    background: rgba(255, 77, 79, 0.1);
    color: var(--error);
}

.tag.info {
    background: rgba(24, 144, 255, 0.1);
    color: var(--info);
}

.tag.category {
    background: var(--bg-secondary);
    color: var(--text-secondary);
}

/* ==================== 小红花徽章 ==================== */
.flower-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 10px;
    background: linear-gradient(135deg, #FFF5F5 0%, #FFE8E8 100%);
    border-radius: 20px;
    font-weight: 600;
    color: var(--primary);
}

.flower-badge.large {
    padding: 8px 16px;
    font-size: 18px;
}

.flower-count {
    display: flex;
    align-items: center;
    gap: 6px;
    font-weight: 600;
    color: var(--primary);
}

/* ==================== 头像 ==================== */
.avatar {
    border-radius: 50%;
    object-fit: cover;
    flex-shrink: 0;
}

.avatar-placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    color: white;
    font-weight: 600;
}

/* ==================== 表单 ==================== */
.form-field {
    margin-bottom: var(--spacing-md);
}

.form-label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
    color: var(--text-primary);
}

.form-input {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    background: var(--bg-card);
    transition: all var(--transition-fast);
}

.form-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(255, 107, 107, 0.1);
}

.form-hint {
    margin-top: var(--spacing-xs);
    font-size: 12px;
    color: var(--text-muted);
}

/* ==================== 图标选择器 ==================== */
.icon-selector {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
}

.icon-option {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.icon-option:hover {
    background: var(--bg-card);
}

.icon-option.selected {
    background: var(--primary);
    box-shadow: var(--shadow-sm);
}

/* ==================== 登录页面 ==================== */
.login-overlay {
    position: fixed;
    inset: 0;
    background: linear-gradient(135deg, #FFF5F5 0%, #FFE8E8 50%, #FFF0F0 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

.login-overlay.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.login-card {
    width: 100%;
    max-width: 400px;
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-lg);
}

.login-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.login-logo {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
}

.login-logo .flower-icon.large {
    width: 64px;
    height: 64px;
}

.login-title {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: var(--spacing-xs);
}

.login-subtitle {
    color: var(--text-muted);
}

.login-form {
    margin-top: var(--spacing-lg);
}

/* ==================== 模态框 ==================== */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal {
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    transform: scale(0.9);
    transition: transform var(--transition-normal);
}

.modal-overlay.active .modal {
    transform: scale(1);
}

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

.modal-title {
    font-size: 18px;
    font-weight: 600;
}

.modal-close {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    color: var(--text-muted);
    transition: all var(--transition-fast);
}

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

.modal-body {
    padding: var(--spacing-lg);
    max-height: 60vh;
    overflow-y: auto;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-sm);
    padding: var(--spacing-lg);
    border-top: 1px solid var(--divider);
    background: var(--bg-secondary);
}

/* ==================== Toast 通知 ==================== */
.toast-container {
    position: fixed;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.toast {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--bg-card);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    animation: toast-in 0.3s ease;
    max-width: 360px;
}

.toast.removing {
    animation: toast-out 0.3s ease forwards;
}

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

@keyframes toast-out {
    to {
        transform: translateX(100%);
        opacity: 0;
    }
}

.toast-icon {
    width: 24px;
    height: 24px;
    flex-shrink: 0;
}

.toast-icon svg {
    width: 100%;
    height: 100%;
}

.toast.success .toast-icon {
    color: var(--success);
}

.toast.error .toast-icon {
    color: var(--error);
}

.toast.warning .toast-icon {
    color: var(--warning);
}

.toast.info .toast-icon {
    color: var(--info);
}

.toast-content {
    flex: 1;
}

.toast-title {
    font-weight: 600;
    color: var(--text-primary);
}

.toast-message {
    font-size: 13px;
    color: var(--text-secondary);
    margin-top: 2px;
}

.toast-close {
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    font-size: 18px;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.toast-close:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

/* ==================== 加载状态 ==================== */
.loading-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl);
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.loading-text {
    margin-top: var(--spacing-md);
    color: var(--text-muted);
}

/* ==================== 空状态 ==================== */
.empty-state {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--text-muted);
}

.empty-state-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl);
}

.empty-icon {
    width: 64px;
    height: 64px;
    color: var(--text-muted);
    margin-bottom: var(--spacing-md);
}

.empty-icon svg {
    width: 100%;
    height: 100%;
}

.empty-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}

.empty-description {
    color: var(--text-muted);
}

/* ==================== 商城样式 ==================== */

/* 商城头部 */
.shop-header {
    background: linear-gradient(135deg, #FF6B6B 0%, #FFE66D 100%);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
    color: white;
    position: relative;
    overflow: hidden;
}

.shop-header::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 300px;
    height: 300px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
}

.shop-header::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 200px;
    height: 200px;
    background: rgba(255, 255, 255, 0.08);
    border-radius: 50%;
}

.shop-title {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
    position: relative;
    z-index: 1;
}

.shop-subtitle {
    opacity: 0.9;
    position: relative;
    z-index: 1;
}

/* 分类标签栏 */
.category-tabs {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
    padding: var(--spacing-sm);
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
}

.category-tab {
    padding: 10px 20px;
    border-radius: var(--radius-md);
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.category-tab:hover {
    background: var(--bg-card);
    color: var(--primary);
}

.category-tab.active {
    background: var(--primary);
    color: white;
    box-shadow: var(--shadow-sm);
}

/* 商品网格 */
.shop-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: var(--spacing-lg);
}

/* 商品卡片 */
.product-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
    position: relative;
}

.product-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.product-card.hot::before {
    content: '🔥 热门';
    position: absolute;
    top: 12px;
    left: -8px;
    background: linear-gradient(135deg, #FF6B6B 0%, #FF8E8E 100%);
    color: white;
    padding: 4px 16px 4px 12px;
    font-size: 12px;
    font-weight: 600;
    border-radius: 0 20px 20px 0;
    z-index: 10;
    box-shadow: 0 2px 8px rgba(255, 107, 107, 0.3);
}

.product-image {
    width: 100%;
    height: 160px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 64px;
    background: linear-gradient(135deg, #FFF5F5 0%, #FFE8E8 100%);
    position: relative;
}

.product-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.product-badge {
    position: absolute;
    top: 8px;
    right: 8px;
    background: rgba(0, 0, 0, 0.6);
    color: white;
    padding: 4px 8px;
    border-radius: var(--radius-sm);
    font-size: 11px;
}

.product-info {
    padding: var(--spacing-md);
}

.product-name {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.product-desc {
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: var(--spacing-md);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    min-height: 36px;
}

.product-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md);
    border-top: 1px solid var(--divider);
    background: var(--bg-secondary);
}

.product-price {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 20px;
    font-weight: 700;
    color: var(--primary);
}

.product-price .flower-icon {
    width: 24px;
    height: 24px;
}

.product-actions {
    display: flex;
    gap: var(--spacing-xs);
}

.product-btn {
    padding: 8px 16px;
    border-radius: var(--radius-md);
    font-weight: 500;
    font-size: 13px;
    transition: all var(--transition-fast);
}

.product-btn.primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    color: white;
}

.product-btn.primary:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 12px rgba(255, 107, 107, 0.3);
}

.product-btn.ghost {
    color: var(--text-secondary);
}

.product-btn.ghost:hover {
    background: var(--bg-hover);
    color: var(--primary);
}

/* 商品卡片 - 管理模式 */
.product-card.admin-mode .product-footer {
    justify-content: flex-end;
}

.product-card.admin-mode .product-actions {
    width: 100%;
    justify-content: space-between;
}

/* 空状态 - 商城 */
.shop-empty {
    text-align: center;
    padding: var(--spacing-xl) * 2;
    color: var(--text-muted);
}

.shop-empty-icon {
    font-size: 64px;
    margin-bottom: var(--spacing-md);
}

/* ==================== 响应式 ==================== */
@media (max-width: 1024px) {
    .sidebar {
        transform: translateX(-100%);
    }
    
    .sidebar.open {
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .menu-toggle {
        display: flex;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 640px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .toolbar {
        flex-direction: column;
        align-items: stretch;
    }
    
    .toolbar-left,
    .toolbar-right {
        width: 100%;
    }
    
    .search-input {
        width: 100%;
    }
    
    .page-content {
        padding: var(--spacing-md);
    }
    
    .card-body {
        padding: var(--spacing-md);
    }
    
    .modal {
        margin: var(--spacing-md);
        max-width: calc(100% - var(--spacing-xl));
    }
    
    /* 移动端侧边栏收起状态 */
    .sidebar.collapsed {
        transform: translateX(-100%);
    }
}

/* ==================== 商品导入提示 ==================== */
.import-tip {
    background: linear-gradient(135deg, #FFF8E1 0%, #FFECB3 100%);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-lg);
    overflow: hidden;
    border: 1px solid #FFD54F;
}

.import-tip-header {
    background: linear-gradient(135deg, #FFB300 0%, #FFC107 100%);
    color: white;
    padding: var(--spacing-sm) var(--spacing-md);
    font-weight: 600;
    font-size: 14px;
}

.import-tip-content {
    padding: var(--spacing-md);
    font-size: 13px;
    color: #5D4037;
}

.import-tip-content p {
    margin-bottom: var(--spacing-sm);
}

.import-tip-content ol {
    margin: 0;
    padding-left: var(--spacing-lg);
}

.import-tip-content li {
    margin-bottom: var(--spacing-xs);
}

/* ==================== 图片输入和预览 ==================== */
.image-input-wrapper {
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-start;
}

.image-input-wrapper .form-input {
    flex: 1;
}

.image-preview {
    width: 80px;
    height: 80px;
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
    border: 2px dashed var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    flex-shrink: 0;
    transition: all var(--transition-fast);
}

.image-preview span {
    font-size: 11px;
    color: var(--text-muted);
    text-align: center;
    padding: var(--spacing-xs);
}

.image-preview.has-image {
    border-style: solid;
    border-color: var(--primary-light);
}

.image-preview img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}