/* Additional portfolio-specific styles */
        .portfolio-hero {
            background: linear-gradient(135deg, var(--primary-color) 0%, #1a5a7a 100%);
            padding: 8rem 1.5rem 4rem;
            text-align: center;
            color: white;
        }

        .portfolio-hero h1 {
            font-size: clamp(2rem, 6vw, 3.5rem);
            margin-bottom: 1rem;
        }

        .portfolio-hero p {
            font-size: 1.1rem;
            max-width: 600px;
            margin: 0 auto;
            opacity: 0.9;
        }

        .portfolio-filter {
            background: var(--background-color);
            padding: 1.5rem;
            border-bottom: 1px solid var(--border-light);
            position: sticky;
            top: 70px;
            z-index: 99;
            background: rgba(249, 250, 251, 0.95);
            backdrop-filter: blur(8px);
        }

        .filter-buttons {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 0.75rem;
            max-width: 800px;
            margin: 0 auto;
        }

        .filter-btn {
            padding: 0.6rem 1.25rem;
            background: white;
            border: 1px solid #e2e8f0;
            border-radius: 50px;
            font-family: 'Inter', sans-serif;
            font-weight: 600;
            font-size: 0.85rem;
            color: var(--primary-text);
            cursor: pointer;
            transition: all 0.3s ease;
        }

        .filter-btn:hover {
            border-color: var(--secondary-color);
            color: var(--secondary-color);
        }

        .filter-btn.active {
            background: var(--secondary-color);
            color: white;
            border-color: var(--secondary-color);
        }

        .portfolio-grid {
            max-width: 1280px;
            margin: 0 auto;
            padding: 3rem 1.5rem;
            display: grid;
            grid-template-columns: 1fr;
            gap: 2rem;
        }

        .portfolio-card {
            background: white;
            border-radius: 20px;
            overflow: hidden;
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
            transition: all 0.3s ease;
            opacity: 1;
            transform: translateY(0);
        }

        .portfolio-card:hover {
            transform: translateY(-8px);
            box-shadow: 0 20px 35px rgba(0, 0, 0, 0.1);
        }

        .card-image {
            position: relative;
            height: 220px;
            background: linear-gradient(135deg, #0B3C5D, #1CA7EC);
            display: flex;
            align-items: center;
            justify-content: center;
            overflow: hidden;
        }

        .card-image i {
            font-size: 4rem;
            color: rgba(255, 255, 255, 0.9);
            transition: all 0.3s ease;
        }

        .card-image .placeholder-icon {
            background: rgba(255, 255, 255, 0.15);
            width: 80px;
            height: 80px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .card-badge {
            position: absolute;
            top: 1rem;
            right: 1rem;
            background: var(--secondary-color);
            color: white;
            padding: 0.25rem 0.75rem;
            border-radius: 50px;
            font-size: 0.7rem;
            font-weight: 600;
        }

        .card-content {
            padding: 1.5rem;
        }

        .card-category {
            display: inline-block;
            background: var(--accent-color);
            color: var(--primary-color);
            padding: 0.2rem 0.8rem;
            border-radius: 50px;
            font-size: 0.7rem;
            font-weight: 600;
            margin-bottom: 0.75rem;
        }

        .card-content h3 {
            font-size: 1.3rem;
            color: var(--primary-color);
            margin-bottom: 0.5rem;
        }

        .card-content p {
            color: var(--text-muted);
            font-size: 0.9rem;
            line-height: 1.5;
            margin-bottom: 1rem;
        }

        .tech-stack {
            display: flex;
            flex-wrap: wrap;
            gap: 0.5rem;
            margin-bottom: 1.25rem;
        }

        .tech-stack span {
            background: #f1f5f9;
            padding: 0.25rem 0.7rem;
            border-radius: 50px;
            font-size: 0.7rem;
            font-weight: 500;
            color: var(--primary-color);
        }

        .card-links {
            display: flex;
            gap: 1rem;
            align-items: center;
        }

        .card-links a {
            font-size: 0.85rem;
            font-weight: 600;
            text-decoration: none;
            transition: all 0.2s;
        }

        .link-demo {
            color: var(--secondary-color);
        }

        .link-demo:hover {
            text-decoration: underline;
        }

        .link-info {
            color: var(--text-muted);
        }

        .portfolio-cta {
            background: var(--accent-color);
            text-align: center;
            padding: 4rem 1.5rem;
            margin-top: 2rem;
        }

        .portfolio-cta h2 {
            color: var(--primary-color) !important;
            margin-bottom: 1rem;
        }

        .portfolio-cta p {
            color: var(--text-muted) !important;
        }

        .portfolio-cta .btn-primary {
            margin-top: 1rem;
        }

        @media (min-width: 640px) {
            .portfolio-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (min-width: 1024px) {
            .portfolio-grid {
                grid-template-columns: repeat(3, 1fr);
            }
            .portfolio-filter {
                top: 75px;
            }
        }

        @media (max-width: 480px) {
            .filter-btn {
                padding: 0.4rem 1rem;
                font-size: 0.75rem;
            }
            .card-image {
                height: 180px;
            }
        }

        /* Animation classes */
        .portfolio-card.hide {
            display: none;
        }

        .portfolio-card.show {
            animation: fadeInUp 0.5s ease forwards;
        }

        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(20px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }