/* ============================================
   FastAdmin 插件市场 - 现代化UI设计
   遵循FastAdmin设计规范，提供优质用户体验
============================================ */

/* CSS变量定义 */
:root {
    /* 主色调系统 */
    --primary-50: #eff6ff;
    --primary-100: #dbeafe;
    --primary-200: #bfdbfe;
    --primary-300: #93c5fd;
    --primary-400: #60a5fa;
    --primary-500: #3b82f6;
    --primary-600: #2563eb;
    --primary-700: #1d4ed8;
    --primary-800: #1e40af;
    --primary-900: #1e3a8a;

    /* 中性色系 */
    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;
    --gray-900: #0f172a;

    /* 状态色系 */
    --success-50: #f0fdf4;
    --success-500: #22c55e;
    --success-600: #16a34a;
    --warning-50: #fffbeb;
    --warning-500: #f59e0b;
    --warning-600: #d97706;
    --danger-50: #fef2f2;
    --danger-500: #ef4444;
    --danger-600: #dc2626;

    /* 设计系统 */
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-2xl: 20px;
    --radius-full: 9999px;

    /* 阴影系统 */
    --shadow-xs: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-sm: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);

    /* 间距系统 */
    --spacing-1: 4px;
    --spacing-2: 8px;
    --spacing-3: 12px;
    --spacing-4: 16px;
    --spacing-5: 20px;
    --spacing-6: 24px;
    --spacing-8: 32px;
    --spacing-10: 40px;
    --spacing-12: 48px;
    --spacing-16: 64px;
    --spacing-20: 80px;

    /* 动画 */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* 全局重置 */
* {
    box-sizing: border-box;
}

body {
    background: var(--gray-50) !important;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Ubuntu, 
                 'Helvetica Neue', Helvetica, Arial, 'PingFang SC', 
                 'Hiragino Sans GB', 'Microsoft YaHei UI', 'Microsoft YaHei', 
                 'Source Han Sans CN', sans-serif !important;
    font-size: 14px !important;
    line-height: 1.6;
    color: var(--gray-800);
	overflow-x: hidden; 
    margin: 0;
    padding: 0;
}

#vapp {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ============================================
   英雄区域样式
============================================ */
.hero-section {
    background: #f4f6f8;
    color: #1a202c;
    padding: var(--spacing-16) 0;
    position: relative;
    overflow: hidden;
    border-bottom: 1px solid #e2e8f0;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.05) 0%, rgba(118, 75, 162, 0.05) 100%);
    pointer-events: none;
}

.hero-content {
    max-width: 1200px;
   margin: 0 auto;
    padding: 0 var(--spacing-6);
    text-align: center;
    position: relative;
    z-index: 1;
}

.hero-title {
    margin: 0 0 var(--spacing-4) 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-3);
}

.title-main {
    font-size: 3rem;
    font-weight: 700;
    color: #000000;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.15);
    letter-spacing: -0.02em;
}

.title-badge {
    display: inline-flex;
    align-items: center;
    padding: 10px 20px;
    background: rgba(79, 70, 229, 0.15);
    border: 2px solid rgba(79, 70, 229, 0.3);
    border-radius: 25px;
    font-size: 14px;
    font-weight: 600;
    color: #4f46e5;
    text-shadow: 0 1px 2px rgba(79, 70, 229, 0.2);
    box-shadow: 0 2px 8px rgba(79, 70, 229, 0.1);
}

.hero-subtitle {
    font-size: 18px;
    margin: 0 auto 32px auto;
    color: #475569;
    max-width: 600px;
    text-align: center;
    font-weight: 500;
    line-height: 1.6;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}

.hero-stats {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-8);
    margin-top: var(--spacing-8);
}

.stat-item {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2.2rem;
    font-weight: 800;
    margin-bottom: 8px;
    color: #4f46e5;
    text-shadow: 0 2px 4px rgba(79, 70, 229, 0.2);
    letter-spacing: -0.02em;
}

.stat-label {
    font-size: 0.9rem;
    font-weight: 600;
    color: #475569;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}

/* 高级交互效果 */
.plugin-card {
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.plugin-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #4f46e5, #8b5cf6);
    transform: scaleX(0);
    transition: transform 0.3s ease;
    z-index: 1;
}

.plugin-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.15);
}

.plugin-card:hover::before {
    transform: scaleX(1);
}

/* 3D卡片效果 */
.plugin-card {
    will-change: transform;
    transform: translateZ(0);
}

/* 按钮波纹效果 */
.btn {
    position: relative;
    overflow: hidden;
}

.ripple {
    position: absolute;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: scale(0);
    animation: ripple-animation 0.6s linear;
    pointer-events: none;
}

@keyframes ripple-animation {
    to {
        transform: scale(4);
        opacity: 0;
    }
}

/* 搜索框聚焦效果 */
.search-container.focused {
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
    border-color: #4f46e5;
}

/* 筛选按钮高级效果 */
.filter-btn {
    position: relative;
    overflow: hidden;
    transition: all 0.3s ease;
}

.filter-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(79, 70, 229, 0.1), transparent);
    transition: left 0.5s;
}

.filter-btn:hover::before {
    left: 100%;
}

.filter-btn.active {
    background: linear-gradient(135deg, #4f46e5, #8b5cf6);
    color: white;
    box-shadow: 0 4px 15px rgba(79, 70, 229, 0.3);
}

/* 加载动画 */
.loading-spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(79, 70, 229, 0.3);
    border-radius: 50%;
    border-top-color: #4f46e5;
    animation: spin 1s ease-in-out infinite;
}

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

/* 滚动优化 */
.smooth-scroll {
    scroll-behavior: smooth;
}

/* 硬件加速 */
.plugin-card,
.filter-btn,
.btn {
    will-change: transform;
    transform: translateZ(0);
}

.stat-divider {
    width: 1px;
    height: 40px;
    background: #cbd5e1;
    margin: 0 20px;
}

/* ============================================
   筛选区域样式
============================================ */
.filter-section {
    background: white;
    border-bottom: 1px solid var(--gray-200);
    padding: var(--spacing-6) 0;
    margin-bottom: var(--spacing-8);
    box-shadow: var(--shadow-sm);
}

.filter-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-6);
}

.filter-group {
    margin-bottom: var(--spacing-6);
}

.filter-group:last-child {
    margin-bottom: 0;
}

.filter-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    margin-bottom: var(--spacing-3);
    font-weight: 600;
    color: var(--gray-700);
}

.filter-label i {
    font-size: 1.125rem;
    color: var(--primary-600);
}

.filter-options {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-2);
}

.filter-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-1);
    padding: var(--spacing-2) var(--spacing-4);
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-full);
    background: white;
    color: var(--gray-600);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
}

.filter-btn:hover {
    border-color: var(--primary-300);
    color: var(--primary-600);
    background: var(--primary-50);
    transform: translateY(-1px);
}

.filter-btn.active {
    background: var(--primary-600);
    border-color: var(--primary-600);
    color: white;
    box-shadow: var(--shadow-sm);
}

.filter-btn i {
    font-size: 1rem;
}

/* 搜索组件 */
.search-group {
    margin-top: var(--spacing-6);
}

.search-wrapper {
    position: relative;
    max-width: 400px;
    margin: 0 auto;
}

.search-input {
    width: 100%;
    padding: var(--spacing-3) var(--spacing-12) var(--spacing-3) var(--spacing-10);
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    background: var(--gray-50);
    transition: all var(--transition-fast);
}

.search-input:focus {
    outline: none;
    border-color: var(--primary-500);
    background: white;
    box-shadow: 0 0 0 3px var(--primary-100);
}

.search-icon {
    position: absolute;
    left: var(--spacing-3);
    top: 50%;
    transform: translateY(-50%);
    color: var(--gray-400);
    pointer-events: none;
}

.search-btn {
    position: absolute;
    right: var(--spacing-1);
    top: 50%;
    transform: translateY(-50%);
    width: 32px;
    height: 32px;
    border: none;
    border-radius: var(--radius-full);
    background: var(--primary-600);
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.search-btn:hover {
    background: var(--primary-700);
    transform: translateY(-50%) scale(1.05);
}

/* ============================================
   工具栏样式
============================================ */
.toolbar-section {
    margin-bottom: var(--spacing-8);
}

.toolbar-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-6);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-4);
}

.toolbar-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-4);
}

.sort-group {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
}

.sort-label {
    font-weight: 600;
    color: var(--gray-700);
    font-size: 0.875rem;
}

.sort-buttons {
	display: flex;
    gap: var(--spacing-2);
	flex-wrap: wrap;
}

.sort-btn {
    display: inline-flex;
	align-items: center;
    gap: var(--spacing-1);
    padding: var(--spacing-2) var(--spacing-3);
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-md);
    background: white;
    color: var(--gray-600);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
}

.sort-btn:hover {
    border-color: var(--primary-300);
    color: var(--primary-600);
    background: var(--primary-50);
}

.sort-btn.active {
    background: var(--primary-600);
    border-color: var(--primary-600);
    color: white;
}

.view-toggle {
    display: flex;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.view-btn {
    padding: var(--spacing-2) var(--spacing-3);
    border: none;
    background: white;
    color: var(--gray-600);
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.view-btn:hover {
    background: var(--gray-50);
}

.view-btn.active {
    background: var(--primary-600);
    color: white;
}

.view-btn + .view-btn {
    border-left: 1px solid var(--gray-300);
}

/* 工具栏搜索框样式 */
.search-group-toolbar {
    margin-left: var(--spacing-4);
}

.search-wrapper-toolbar {
    position: relative;
    width: 280px;
}

.search-input-toolbar {
    width: 100%;
    padding: var(--spacing-2) var(--spacing-10) var(--spacing-2) var(--spacing-8);
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    background: white;
    transition: all var(--transition-fast);
}

.search-input-toolbar:focus {
    outline: none;
    border-color: var(--primary-500);
    box-shadow: 0 0 0 2px var(--primary-100);
}

.search-wrapper-toolbar .search-icon {
    position: absolute;
    left: var(--spacing-3);
    top: 50%;
    transform: translateY(-50%);
    color: var(--gray-400);
    pointer-events: none;
    font-size: 1rem;
}

.search-btn-toolbar {
    position: absolute;
    right: 2px;
    top: 50%;
    transform: translateY(-50%);
    width: 28px;
    height: 28px;
    border: none;
    border-radius: var(--radius-full);
    background: var(--primary-600);
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    font-size: 0.875rem;
}

.search-btn-toolbar:hover {
    background: var(--primary-700);
}

/* ============================================
   项目列表样式
============================================ */
.projects-section {
    flex: 1;
    margin-bottom: var(--spacing-16);
}

.projects-container {
    max-width: 1200px;
	margin: 0 auto;
    padding: 0 var(--spacing-6);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: var(--spacing-5);
    margin-bottom: var(--spacing-8);
}

/* 列表视图 */
.projects-grid.list-view {
    grid-template-columns: 1fr;
    gap: var(--spacing-4);
}

.projects-grid.list-view .project-card {
	display: flex;
	flex-direction: row;
    align-items: stretch;
}

.projects-grid.list-view .card-image {
    width: 200px;
    flex-shrink: 0;
}

.projects-grid.list-view .card-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

/* 项目卡片 */
.project-card {
    background: white;
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
    cursor: pointer;
    position: relative;
    border: 1px solid var(--gray-200);
}

.project-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-200);
}


.project-card.clicked {
    transform: translateY(-2px) scale(0.98);
}

.card-image {
    position: relative;
    width: 100%;
    height: 160px;
    overflow: hidden;
    background: var(--gray-100);
}

.project-image {
	width: 100%;
	height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.project-card:hover .project-image {
    transform: scale(1.05);
}

.project-badge {
    position: absolute;
    top: var(--spacing-3);
    right: var(--spacing-3);
    padding: var(--spacing-1) var(--spacing-2);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
    color: white;
    z-index: 2;
}

.badge-free {
    background: var(--success-500);
}

.badge-recommend {
    background: var(--primary-500);
}

.badge-hot {
    background: var(--danger-500);
}

.badge-new {
    background: var(--warning-500);
}

.badge-half {
    background: linear-gradient(45deg, var(--danger-500), var(--warning-500));
}


.card-content {
    padding: var(--spacing-4);
}

.project-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--gray-800);
    margin: 0 0 var(--spacing-1) 0;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.project-description {
    color: var(--gray-600);
    font-size: 0.8125rem;
    line-height: 1.4;
    margin: 0 0 var(--spacing-3) 0;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.project-stats {
    display: flex;
    gap: var(--spacing-3);
    margin-bottom: var(--spacing-3);
}

.project-stats .stat-item {
    display: flex;
    align-items: center;
    gap: 3px;
    font-size: 0.8125rem;
    color: var(--gray-500);
}

.project-stats .stat-item i {
    font-size: 0.875rem;
}

.card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--spacing-3);
    border-top: 1px solid var(--gray-100);
}

.price-group {
	display: flex;
	align-items: center;
    gap: var(--spacing-2);
}

.price-original {
    font-size: 0.875rem;
    color: var(--gray-400);
    text-decoration: line-through;
}

.price-current {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--danger-600);
}

.price-free {
    display: flex;
    align-items: center;
    gap: var(--spacing-1);
    font-size: 1rem;
    font-weight: 600;
    color: var(--success-600);
}

.action-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-1);
    padding: var(--spacing-2) var(--spacing-4);
    background: var(--primary-600);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
	cursor: pointer;
    transition: all var(--transition-fast);
}

.action-btn:hover {
    background: var(--primary-700);
    transform: translateY(-1px);
}

/* ============================================
   空状态样式
============================================ */
.empty-state {
    text-align: center;
    padding: var(--spacing-16) var(--spacing-6);
    color: var(--gray-500);
}

.empty-icon {
    font-size: 4rem;
    color: var(--gray-300);
    margin-bottom: var(--spacing-4);
}

.empty-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--gray-700);
    margin: 0 0 var(--spacing-2) 0;
}

.empty-description {
    font-size: 1rem;
    margin: 0 0 var(--spacing-6) 0;
    max-width: 400px;
    margin-left: auto;
    margin-right: auto;
}

.empty-action {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-2);
    padding: var(--spacing-3) var(--spacing-6);
    background: var(--primary-600);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
	cursor: pointer;
    transition: all var(--transition-fast);
}

.empty-action:hover {
    background: var(--primary-700);
    transform: translateY(-1px);
}

/* ============================================
   分页样式
============================================ */
.pagination-section {
    margin-top: var(--spacing-12);
    padding: var(--spacing-8) 0;
    border-top: 1px solid var(--gray-200);
    background: white;
}

.pagination-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-6);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-4);
}

.pagination-info {
    color: var(--gray-600);
    font-size: 0.875rem;
}

.pagination-info strong {
    color: var(--gray-800);
    font-weight: 600;
}

.pagination-wrapper {
    flex: 1;
    display: flex;
    justify-content: center;
}

/* LayUI 分页样式优化 */
.layui-laypage {
	display: flex;
	align-items: center;
    gap: var(--spacing-2);
}

.layui-laypage a,
.layui-laypage span {
    padding: var(--spacing-2) var(--spacing-3) !important;
    border-radius: var(--radius-md) !important;
    border: 1px solid var(--gray-300) !important;
    transition: all var(--transition-fast) !important;
}

.layui-laypage a:hover {
    border-color: var(--primary-500) !important;
    color: var(--primary-600) !important;
    background: var(--primary-50) !important;
}

.layui-laypage .layui-laypage-curr .layui-laypage-em {
    background: var(--primary-600) !important;
    border-color: var(--primary-600) !important;
}

/* ============================================
   响应式设计
============================================ */
@media (max-width: 768px) {
    .hero-content {
        padding: 0 var(--spacing-4);
    }
    
    .title-main {
        font-size: 2rem;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: var(--spacing-4);
    }
    
    .stat-divider {
        width: 40px;
        height: 1px;
    }
    
    .filter-container,
    .toolbar-container,
    .projects-container,
    .pagination-container {
        padding: 0 var(--spacing-4);
    }
    
    .toolbar-container {
        flex-direction: column;
        align-items: stretch;
    }
    
    .sort-group {
        justify-content: center;
    }
    
    .view-toggle {
        align-self: center;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-4);
    }
    
    .projects-grid.list-view .project-card {
        flex-direction: column;
    }
    
    .projects-grid.list-view .card-image {
        width: 100%;
        height: 200px;
    }
    
    .pagination-container {
        flex-direction: column;
        text-align: center;
    }
    
    .search-wrapper {
        max-width: none;
    }
    
    .filter-options,
    .sort-buttons {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .title-main {
        font-size: 1.75rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .filter-btn,
    .sort-btn {
        font-size: 0.8125rem;
        padding: var(--spacing-1) var(--spacing-3);
    }
    
    .card-content {
        padding: var(--spacing-4);
    }
    
    .project-title {
        font-size: 1rem;
    }
    
    .project-description {
        font-size: 0.8125rem;
    }
}

/* ============================================
   动画和过渡效果
============================================ */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

/* 加载动画 */
.loading {
    animation: pulse 2s infinite;
}

/* 页面进入动画 */
.hero-section {
    animation: fadeInUp 0.8s ease-out;
}

.filter-section {
    animation: fadeInUp 0.8s ease-out 0.1s both;
}

.toolbar-section {
    animation: fadeInUp 0.8s ease-out 0.2s both;
}

.projects-section {
    animation: fadeInUp 0.8s ease-out 0.3s both;
}

/* 项目卡片交错动画 */
.project-card:nth-child(1) { animation: fadeInUp 0.6s ease-out 0.1s both; }
.project-card:nth-child(2) { animation: fadeInUp 0.6s ease-out 0.2s both; }
.project-card:nth-child(3) { animation: fadeInUp 0.6s ease-out 0.3s both; }
.project-card:nth-child(4) { animation: fadeInUp 0.6s ease-out 0.4s both; }
.project-card:nth-child(5) { animation: fadeInUp 0.6s ease-out 0.5s both; }
.project-card:nth-child(6) { animation: fadeInUp 0.6s ease-out 0.6s both; }
.project-card:nth-child(7) { animation: fadeInUp 0.6s ease-out 0.7s both; }
.project-card:nth-child(8) { animation: fadeInUp 0.6s ease-out 0.8s both; }

/* ============================================
   辅助工具类
============================================ */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.font-bold { font-weight: 700; }
.font-semibold { font-weight: 600; }
.font-medium { font-weight: 500; }

.text-xs { font-size: 0.75rem; }
.text-sm { font-size: 0.875rem; }
.text-base { font-size: 1rem; }
.text-lg { font-size: 1.125rem; }
.text-xl { font-size: 1.25rem; }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--spacing-1); }
.mb-2 { margin-bottom: var(--spacing-2); }
.mb-3 { margin-bottom: var(--spacing-3); }
.mb-4 { margin-bottom: var(--spacing-4); }
.mb-5 { margin-bottom: var(--spacing-5); }
.mb-6 { margin-bottom: var(--spacing-6); }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--spacing-1); }
.mt-2 { margin-top: var(--spacing-2); }
.mt-3 { margin-top: var(--spacing-3); }
.mt-4 { margin-top: var(--spacing-4); }
.mt-5 { margin-top: var(--spacing-5); }
.mt-6 { margin-top: var(--spacing-6); }

/* ============================================
   兼容性和回退样式
============================================ */
/* 兼容旧版浏览器 */
@supports not (display: grid) {
    .projects-grid {
        display: flex;
        flex-wrap: wrap;
        margin: 0 calc(-1 * var(--spacing-3));
    }
    
    .project-card {
        width: calc(25% - var(--spacing-6));
        margin: 0 var(--spacing-3) var(--spacing-6);
    }
    
    @media (max-width: 768px) {
        .project-card {
            width: calc(50% - var(--spacing-6));
        }
    }
    
    @media (max-width: 480px) {
        .project-card {
            width: calc(100% - var(--spacing-6));
        }
    }
}

/* 无障碍访问支持 */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* 高对比度模式支持 */
@media (prefers-contrast: high) {
    :root {
        --gray-100: #f0f0f0;
        --gray-200: #d0d0d0;
        --gray-300: #b0b0b0;
        --primary-600: #0056b3;
    }
}

/* 暗色主题支持 (预留) */
@media (prefers-color-scheme: dark) {
    /* 可以在这里添加暗色主题样式 */
}