/* 作品集头部样式 */
.portfolio-header {
    text-align: center;
    margin-bottom: 3rem;
}

.portfolio-header h1 {
    font-size: 2.5rem;
    color: #2c3e50;
    margin-bottom: 1rem;
}

.portfolio-header p {
    color: #666;
    font-size: 1.1rem;
}

/* 筛选按钮样式 */
.filter-section {
    margin-bottom: 2rem;
}

.filter-buttons {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 0.5rem 1.5rem;
    border: 2px solid #3498db;
    border-radius: 25px;
    background: none;
    color: #3498db;
    cursor: pointer;
    transition: all 0.3s;
    font-size: 1rem;
}

.filter-btn:hover,
.filter-btn.active {
    background-color: #3498db;
    color: #fff;
}

/* 作品网格样式 */
.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.portfolio-item {
    background-color: #fff;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    transition: transform 0.3s;
    cursor: pointer;
}

.portfolio-item:hover {
    transform: translateY(-5px);
}

.portfolio-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.portfolio-info {
    padding: 1.5rem;
}

.portfolio-title {
    font-size: 1.25rem;
    color: #2c3e50;
    margin-bottom: 0.5rem;
}

.portfolio-category {
    color: #666;
    font-size: 0.875rem;
    margin-bottom: 1rem;
}

.portfolio-tech {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.tech-tag {
    padding: 0.25rem 0.75rem;
    background-color: #f0f0f0;
    border-radius: 15px;
    font-size: 0.75rem;
    color: #666;
}

/* 模态框样式 */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.8);
    z-index: 1100;
    overflow-y: auto;
}

.modal.active {
    display: block;
}

.modal-content {
    position: relative;
    width: 90%;
    max-width: 1000px;
    margin: 2rem auto;
    background-color: #fff;
    border-radius: 10px;
    overflow: hidden;
}

.close-btn {
    position: absolute;
    top: 1rem;
    right: 1rem;
    font-size: 2rem;
    color: #fff;
    cursor: pointer;
    z-index: 1;
}

.preview-content {
    display: flex;
    flex-direction: column;
}

.preview-content img {
    width: 100%;
    max-height: 500px;
    object-fit: cover;
}

.preview-info {
    padding: 2rem;
}

.preview-info h2 {
    font-size: 1.5rem;
    color: #2c3e50;
    margin-bottom: 1rem;
}

.preview-info p {
    color: #666;
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.preview-tech {
    margin-bottom: 1.5rem;
}

.preview-tech h3 {
    font-size: 1.1rem;
    color: #2c3e50;
    margin-bottom: 0.5rem;
}

.preview-tech-tags {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.preview-links {
    display: flex;
    gap: 1rem;
}

.preview-btn {
    padding: 0.75rem 1.5rem;
    background-color: #3498db;
    color: #fff;
    text-decoration: none;
    border-radius: 5px;
    transition: background-color 0.3s;
}

.preview-btn:hover {
    background-color: #2980b9;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .portfolio-header h1 {
        font-size: 2rem;
    }

    .filter-buttons {
        flex-direction: column;
        align-items: stretch;
    }

    .filter-btn {
        width: 100%;
    }

    .portfolio-grid {
        grid-template-columns: 1fr;
    }

    .modal-content {
        margin: 1rem;
        width: calc(100% - 2rem);
    }

    .preview-links {
        flex-direction: column;
    }

    .preview-btn {
        text-align: center;
    }
}