/* ================================
   Portfolio Hero
   ================================ */

.portfolio-hero {
    min-height: 50vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: radial-gradient(ellipse at center, rgba(255, 102, 0, 0.08) 0%, transparent 70%);
    position: relative;
    margin-top: 80px;
}

.portfolio-hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        linear-gradient(rgba(255, 102, 0, 0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 102, 0, 0.02) 1px, transparent 1px);
    background-size: 40px 40px;
}

.portfolio-hero-content {
    text-align: center;
    position: relative;
    z-index: 1;
}

/* ================================
   Filters Section
   ================================ */

.portfolio-filters {
    padding: 3rem 0;
    background-color: var(--color-bg-secondary);
    border-bottom: 1px solid rgba(255, 102, 0, 0.1);
    position: sticky;
    top: 80px;
    z-index: 100;
    backdrop-filter: blur(10px);
}

.filters-wrapper {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.filter-btn {
    background-color: transparent;
    border: 2px solid rgba(255, 102, 0, 0.2);
    color: var(--color-text-secondary);
    padding: 0.75rem 1.5rem;
    border-radius: 30px;
    font-family: var(--font-main);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-smooth);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.filter-btn:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
    transform: translateY(-2px);
}

.filter-btn.active {
    background-color: var(--color-accent);
    border-color: var(--color-accent);
    color: var(--color-text-primary);
    box-shadow: 0 0 20px rgba(255, 102, 0, 0.4);
}

/* ================================
   Portfolio Grid
   ================================ */

.portfolio-grid-section {
    padding: 6rem 0;
    background-color: var(--color-bg-primary);
}

.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(380px, 1fr));
    gap: 2.5rem;
}

.project-card {
    background-color: var(--color-bg-secondary);
    border-radius: 16px;
    overflow: hidden;
    transition: var(--transition-smooth);
    border: 1px solid rgba(255, 102, 0, 0.1);
    position: relative;
}

.project-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at top left, rgba(255, 102, 0, 0.1), transparent 60%);
    opacity: 0;
    transition: var(--transition-smooth);
    pointer-events: none;
    z-index: 1;
}

.project-card:hover::before {
    opacity: 1;
}

.project-card:hover {
    transform: translateY(-10px);
    border-color: var(--color-accent);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

.project-card.hidden {
    display: none;
}

.project-link {
    display: block;
    text-decoration: none;
    color: inherit;
}

/* Project Image */
.project-image {
    width: 100%;
    aspect-ratio: 16/10;
    overflow: hidden;
    position: relative;
}

.project-thumb {
    width: 100%;
    height: 100%;
    transition: transform 0.6s ease;
    position: relative;
}

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

.thumb-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(to bottom, transparent 0%, rgba(13, 13, 13, 0.9) 100%);
}

/* Project Info */
.project-info {
    padding: 2rem;
    position: relative;
    z-index: 2;
}

.project-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.project-category {
    color: var(--color-accent);
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.project-year {
    color: var(--color-text-secondary);
    font-size: 0.85rem;
}

.project-title {
    font-size: 1.5rem;
    color: var(--color-text-primary);
    margin-bottom: 1rem;
    line-height: 1.3;
    transition: var(--transition-smooth);
}

.project-card:hover .project-title {
    color: var(--color-accent);
}

.project-description {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
    margin-bottom: 1.5rem;
}

/* Project Tags */
.project-tags {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-bottom: 1rem;
}

.project-tags .tag {
    background-color: rgba(255, 102, 0, 0.1);
    border: 1px solid rgba(255, 102, 0, 0.2);
    color: var(--color-accent);
    padding: 0.4rem 0.9rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
}

/* Project Arrow */
.project-arrow {
    position: absolute;
    bottom: 2rem;
    right: 2rem;
    width: 48px;
    height: 48px;
    background-color: var(--color-accent);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transform: translateX(-10px);
    transition: var(--transition-smooth);
}

.project-card:hover .project-arrow {
    opacity: 1;
    transform: translateX(0);
}

.project-arrow svg {
    color: var(--color-text-primary);
}

/* ================================
   Portfolio CTA
   ================================ */

.portfolio-cta {
    background: 
        radial-gradient(ellipse at center, rgba(255, 102, 0, 0.1) 0%, transparent 70%),
        var(--color-bg-secondary);
    padding: 8rem 0;
    text-align: center;
}

.portfolio-cta .cta-content {
    max-width: 780px;
    margin: 0 auto;
    background: radial-gradient(circle at top left, rgba(255, 102, 0, 0.18), transparent 55%), var(--color-bg-primary);
    padding: 3rem 3.5rem;
    border-radius: 18px;
    border: 1px solid rgba(255, 102, 0, 0.35);
    box-shadow: 0 28px 80px rgba(0, 0, 0, 0.9);
}

.portfolio-cta .cta-content h2 {
    font-size: clamp(2.2rem, 4.4vw, 3.2rem);
    margin-bottom: 1.25rem;
    font-weight: 500;
}

.portfolio-cta .cta-content p {
    font-size: 1.1rem;
    color: var(--color-text-secondary);
    margin-bottom: 2.5rem;
}

/* ================================
   Loading Animation
   ================================ */

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.project-card {
    animation: fadeInUp 0.6s ease both;
}

.project-card:nth-child(1) { animation-delay: 0.1s; }
.project-card:nth-child(2) { animation-delay: 0.2s; }
.project-card:nth-child(3) { animation-delay: 0.3s; }
.project-card:nth-child(4) { animation-delay: 0.4s; }
.project-card:nth-child(5) { animation-delay: 0.5s; }
.project-card:nth-child(6) { animation-delay: 0.6s; }

/* ================================
   Responsive Design
   ================================ */

@media (max-width: 968px) {
    .portfolio-grid {
        grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
        gap: 2rem;
    }
    
    .portfolio-filters {
        position: relative;
        top: 0;
    }
    
    .filters-wrapper {
        gap: 0.75rem;
    }
    
    .filter-btn {
        padding: 0.6rem 1.2rem;
        font-size: 0.85rem;
    }
}

@media (max-width: 640px) {
    .portfolio-grid {
        grid-template-columns: 1fr;
    }
    
    .portfolio-hero {
        min-height: 40vh;
    }
    
    .portfolio-filters {
        padding: 2rem 0;
    }
    
    .portfolio-grid-section {
        padding: 4rem 0;
    }
    
    .portfolio-cta {
        padding: 4rem 0;
    }
    
    .project-info {
        padding: 1.5rem;
    }
    
    .project-arrow {
        opacity: 1;
        transform: translateX(0);
    }
}