/* ============================================
   Portfolio Page Styles
   ============================================ */

.portfolio-header {
    padding: 120px 0 60px;
    background: linear-gradient(180deg, var(--primary-navy) 0%, var(--dark-navy) 100%);
    text-align: center;
}

.portfolio-main-title {
    font-family: var(--font-heading);
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--white);
    background: linear-gradient(135deg, var(--cyan), var(--cyan-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.portfolio-subtitle {
    font-size: 1.2rem;
    color: var(--gray-light);
    max-width: 700px;
    margin: 0 auto;
}

.portfolio-categories {
    padding: 4rem 0;
    background: var(--dark-navy);
}

.portfolio-category {
    margin-bottom: 5rem;
}

.portfolio-category:last-child {
    margin-bottom: 0;
}

.category-header {
    text-align: center;
    margin-bottom: 3rem;
}

.category-title {
    font-family: var(--font-heading);
    font-size: clamp(2rem, 4vw, 2.5rem);
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--cyan);
}

.category-description {
    font-size: 1.1rem;
    color: var(--gray);
}

.portfolio-items-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 2rem;
}

.portfolio-detail-item {
    background: rgba(0, 212, 255, 0.05);
    border: 1px solid rgba(0, 212, 255, 0.1);
    border-radius: 20px;
    overflow: hidden;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

.portfolio-detail-item:hover {
    transform: translateY(-5px);
    border-color: var(--cyan);
    box-shadow: var(--shadow-lg);
    background: rgba(0, 212, 255, 0.1);
}

.portfolio-detail-image {
    width: 100%;
    height: 250px;
    overflow: hidden;
    background: linear-gradient(135deg, rgba(0, 212, 255, 0.1), rgba(13, 59, 74, 0.2));
    display: flex;
    align-items: center;
    justify-content: center;
}

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

.portfolio-detail-item:hover .portfolio-detail-image img {
    transform: scale(1.1);
}

.portfolio-detail-content {
    padding: 2rem;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.portfolio-detail-content h3 {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--white);
}

.portfolio-tag {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: rgba(0, 212, 255, 0.2);
    color: var(--cyan);
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.portfolio-detail-content > p {
    color: var(--gray-light);
    line-height: 1.7;
    margin-bottom: 1.5rem;
    flex: 1;
}

.portfolio-external-link {
    color: var(--cyan);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    display: inline-block;
    margin-top: auto;
}

.portfolio-external-link:hover {
    transform: translateX(5px);
    color: var(--cyan-light);
}

.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--cyan), var(--cyan-light));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-md);
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top a {
    color: var(--primary-navy);
    text-decoration: none;
    font-size: 1.5rem;
    font-weight: bold;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
}

.back-to-top:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

/* Responsive Design */
@media (max-width: 768px) {
    .portfolio-items-grid {
        grid-template-columns: 1fr;
    }

    .portfolio-header {
        padding: 100px 0 40px;
    }

    .portfolio-categories {
        padding: 3rem 0;
    }

    .portfolio-category {
        margin-bottom: 3rem;
    }

    .back-to-top {
        bottom: 1rem;
        right: 1rem;
        width: 45px;
        height: 45px;
    }
}