/* 作品集页面专用样式 - 现代简约抽象 */

/* 页面头部样式 */
.portfolio-header {
    padding: 6rem 0 4rem;
    background: var(--light-color);
    color: var(--dark-color);
    margin-top: 80px;
    position: relative;
    overflow: hidden;
}

/* 抽象背景 */
.portfolio-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(0, 0, 0, 0.1), transparent);
}

.portfolio-header::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        linear-gradient(45deg, transparent 50%, rgba(0, 0, 0, 0.02) 50%),
        linear-gradient(-45deg, transparent 50%, rgba(0, 0, 0, 0.02) 50%);
    opacity: 0.5;
    pointer-events: none;
    z-index: 0;
}

.page-title {
    font-size: 3.5rem;
    color: var(--dark-color);
    text-align: center;
    margin-bottom: 1rem;
    font-weight: var(--weight-bold);
    letter-spacing: -1px;
    position: relative;
    z-index: 1;
}

.page-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 1px;
    background-color: var(--dark-color);
    opacity: 0.3;
}

.page-subtitle {
    text-align: center;
    color: var(--gray-medium);
    max-width: 600px;
    margin: 0 auto 3rem;
    font-size: 1.1rem;
    opacity: 0.9;
    position: relative;
    z-index: 1;
    line-height: 1.6;
}

/* 筛选器样式 - 简约抽象 */
.portfolio-filters {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-top: 2rem;
    position: relative;
    z-index: 1;
}

.filter-btn {
    padding: 0.75rem 1.75rem;
    background-color: transparent;
    border: 1px solid var(--gray-light);
    color: var(--gray-medium);
    border-radius: 0;
    font-weight: var(--weight-medium);
    font-size: 0.85rem;
    cursor: pointer;
    transition: all var(--transition-normal);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    position: relative;
    overflow: hidden;
}

.filter-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(0, 0, 0, 0.03), transparent);
    transition: left 0.6s ease;
}

.filter-btn:hover {
    background-color: rgba(0, 0, 0, 0.02);
    color: var(--dark-color);
    border-color: var(--dark-color);
    transform: translateY(-2px);
}

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

.filter-btn.active {
    background-color: var(--dark-color);
    border-color: var(--dark-color);
    color: var(--light-color);
}

/* 作品网格样式 */
.portfolio-main {
    padding: var(--space-3xl) 0;
}

.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: var(--space-2xl);
    margin-bottom: var(--space-2xl);
}

.portfolio-item {
    background-color: white;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-normal);
    cursor: pointer;
    position: relative;
}

.portfolio-item:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.portfolio-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
    z-index: 1;
}

.portfolio-image {
    height: 220px;
    position: relative;
    overflow: hidden;
}

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

.portfolio-item:hover .portfolio-image img {
    transform: scale(1.05);
}

.portfolio-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(to bottom, transparent, rgba(0, 0, 0, 0.7));
    display: flex;
    align-items: flex-end;
    padding: var(--space-lg);
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.portfolio-item:hover .portfolio-overlay {
    opacity: 1;
}

.overlay-content {
    transform: translateY(20px);
    transition: transform var(--transition-normal);
}

.portfolio-item:hover .overlay-content {
    transform: translateY(0);
}

.view-project {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    background-color: var(--primary-color);
    color: white;
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-md);
    font-weight: 500;
    font-size: 0.875rem;
}

.portfolio-content {
    padding: var(--space-lg);
}

.portfolio-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-sm);
}

.portfolio-category {
    display: inline-block;
    padding: var(--space-xs) var(--space-md);
    background-color: var(--gray-light);
    color: var(--gray-color);
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.portfolio-date {
    font-size: 0.875rem;
    color: var(--gray-color);
}

.portfolio-title {
    font-size: 1.25rem;
    margin-bottom: var(--space-sm);
    color: var(--dark-color);
}

.portfolio-description {
    color: var(--gray-color);
    font-size: 0.875rem;
    margin-bottom: var(--space-md);
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.portfolio-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
}

.portfolio-tag {
    background-color: var(--gray-light);
    color: var(--gray-color);
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
}

/* 加载更多按钮 */
.load-more {
    text-align: center;
    margin-top: var(--space-2xl);
}

.load-more .btn {
    padding: var(--space-lg) var(--space-2xl);
    font-size: 1.125rem;
}

/* 模态框样式 */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    backdrop-filter: blur(10px);
}

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

.modal-content {
    background-color: white;
    border-radius: var(--radius-lg);
    max-width: 800px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
    transform: translateY(20px);
    transition: transform var(--transition-normal);
}

.modal.active .modal-content {
    transform: translateY(0);
}

.modal-close {
    position: absolute;
    top: var(--space-md);
    right: var(--space-md);
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--gray-color);
    cursor: pointer;
    z-index: 1;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
}

.modal-close:hover {
    background-color: var(--gray-light);
    color: var(--dark-color);
}

.modal-body {
    padding: var(--space-2xl);
}

.modal-image {
    width: 100%;
    height: 300px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: var(--radius-md);
    margin-bottom: var(--space-xl);
    overflow: hidden;
}

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

.modal-header {
    margin-bottom: var(--space-xl);
}

.modal-category {
    display: inline-block;
    padding: var(--space-xs) var(--space-md);
    background-color: var(--primary-color);
    color: white;
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: var(--space-md);
}

.modal-title {
    font-size: 2rem;
    margin-bottom: var(--space-sm);
    color: var(--dark-color);
}

.modal-meta {
    display: flex;
    gap: var(--space-xl);
    margin-bottom: var(--space-lg);
    color: var(--gray-color);
    font-size: 0.875rem;
}

.modal-meta-item {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.modal-description {
    margin-bottom: var(--space-xl);
    line-height: 1.8;
}

.modal-tech-stack {
    margin-bottom: var(--space-xl);
}

.modal-tech-stack h4 {
    margin-bottom: var(--space-md);
    color: var(--dark-color);
}

.tech-stack-list {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
}

.tech-stack-item {
    background-color: var(--gray-light);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    color: var(--dark-color);
}

.modal-links {
    display: flex;
    gap: var(--space-md);
    flex-wrap: wrap;
}

.modal-links .btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
}

/* 空状态样式 */
.empty-state {
    text-align: center;
    padding: var(--space-3xl) var(--space-md);
    color: var(--gray-color);
}

.empty-state-icon {
    font-size: 4rem;
    color: var(--gray-light);
    margin-bottom: var(--space-lg);
}

.empty-state h3 {
    margin-bottom: var(--space-sm);
    color: var(--dark-color);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .page-title {
        font-size: 2.25rem;
    }
    
    .portfolio-grid {
        grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
        gap: var(--space-lg);
    }
    
    .portfolio-filters {
        gap: var(--space-xs);
    }
    
    .filter-btn {
        padding: var(--space-xs) var(--space-md);
        font-size: 0.875rem;
    }
    
    .modal-body {
        padding: var(--space-xl) var(--space-lg);
    }
    
    .modal-title {
        font-size: 1.5rem;
    }
    
    .modal-meta {
        flex-direction: column;
        gap: var(--space-sm);
    }
}

@media (max-width: 480px) {
    .portfolio-grid {
        grid-template-columns: 1fr;
    }
    
    .portfolio-header {
        padding: var(--space-2xl) 0 var(--space-xl);
    }
    
    .page-title {
        font-size: 1.75rem;
    }
    
    .page-subtitle {
        font-size: 1rem;
    }
    
    .modal-content {
        width: 95%;
    }
}