/* CSS Reset & Base Styles */
        *, *::before, *::after {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        :root {
            --dark-blue: #2c3e50;
            --light-blue: #3498db;
            --red: #e74c3c;
            --white: #ffffff;
            --light-gray: #ecf0f1;
            --dark-gray: #34495e;
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }

        @media (prefers-reduced-motion: reduce) {
            html {
                scroll-behavior: auto;
            }
            *, *::before, *::after {
                animation-duration: 0.01ms !important;
                animation-iteration-count: 1 !important;
                transition-duration: 0.01ms !important;
            }
        }

        body {
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
            line-height: 1.6;
            color: var(--dark-blue);
            background-color: var(--white);
            overflow-x: hidden;
        }

        /* Skip Link for Accessibility */
        .skip-link {
            position: absolute;
            top: -40px;
            left: 0;
            background: var(--red);
            color: var(--white);
            padding: 8px 16px;
            text-decoration: none;
            z-index: 10000;
            border-radius: 0 0 4px 0;
            font-weight: 600;
        }

        .skip-link:focus {
            top: 0;
            outline: 3px solid var(--light-blue);
            outline-offset: 2px;
        }

        /* Logo */
        .logo {
            position: fixed;
            top: 20px;
            left: 50%;
            transform: translateX(-50%);
            z-index: 1000;
            width: 180px;
            height: auto;
            transition: var(--transition);
        }

        .logo img {
            width: 100%;
            height: auto;
            display: block;
            filter: drop-shadow(0 4px 12px rgba(0, 0, 0, 0.3));
        }

        /* Navigation - Desktop (Vertical Right) */
        .nav-container {
            position: fixed;
            right: 30px;
            top: 50%;
            transform: translateY(-50%);
            z-index: 999;
            display: flex;
            flex-direction: column;
            gap: 20px;
        }

        .nav-container a {
            color: var(--white);
            text-decoration: none;
            font-weight: 600;
            font-size: 0.95rem;
            padding: 12px 20px;
            background: rgba(52, 152, 219, 0.9);
            border-radius: 8px;
            transition: var(--transition);
            text-align: center;
            backdrop-filter: blur(10px);
            border: 2px solid transparent;
        }

        .nav-container a:hover,
        .nav-container a:focus {
            background: var(--red);
            transform: translateX(-5px);
            border-color: var(--white);
            outline: none;
        }

        .nav-container a.active {
            background: var(--red);
        }

        /* Navigation - Mobile (Bottom Horizontal) */
        @media (max-width: 768px) {
            .logo {
                width: 120px;
                top: 10px;
            }

            .nav-container {
                position: fixed;
                bottom: 0;
                left: 0;
                right: 0;
                top: auto;
                transform: none;
                flex-direction: row;
                justify-content: space-around;
                background: rgba(44, 62, 80, 0.98);
                padding: 10px 5px;
                gap: 5px;
                box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.3);
            }

            .nav-container a {
                font-size: 0.75rem;
                padding: 10px 8px;
                flex: 1;
                border-radius: 6px;
            }

            .nav-container a:hover,
            .nav-container a:focus {
                transform: translateY(-3px);
            }
        }

        /* Hero Section */
        .hero {
            position: relative;
            min-height: 60vh;
            background: linear-gradient(135deg, var(--dark-blue) 0%, #1a252f 100%);
            display: flex;
            align-items: center;
            justify-content: center;
            overflow: hidden;
            color: var(--white);
            padding: 120px 20px 80px;
        }

        /* Animated SVG Grid Background */
        .hero-bg {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            z-index: 1;
            opacity: 0.3;
        }

        .hero-content {
            position: relative;
            z-index: 2;
            text-align: center;
            padding: 20px;
            max-width: 900px;
        }

        .hero h1 {
            font-size: clamp(2.5rem, 5vw, 4.5rem);
            font-weight: 900;
            margin-bottom: 20px;
            line-height: 1.1;
            text-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
        }

        .hero-subtitle {
            font-size: clamp(1.1rem, 2vw, 1.4rem);
            font-weight: 300;
            opacity: 0.95;
            text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
            margin-bottom: 30px;
        }

        .hero-stats {
            display: flex;
            justify-content: center;
            gap: 40px;
            flex-wrap: wrap;
            margin-top: 40px;
        }

        .stat-item {
            text-align: center;
        }

        .stat-number {
            font-size: clamp(2rem, 4vw, 3rem);
            font-weight: 900;
            color: var(--red);
            display: block;
            text-shadow: 0 2px 10px rgba(231, 76, 60, 0.5);
        }

        .stat-label {
            font-size: 0.95rem;
            opacity: 0.9;
            font-weight: 500;
        }

        /* Pulsing Lights Animation */
        .pulsing-light {
            position: absolute;
            border-radius: 50%;
            filter: blur(40px);
            animation: float 6s ease-in-out infinite;
            z-index: 1;
        }

        .light-1 {
            width: 300px;
            height: 300px;
            background: var(--light-blue);
            top: 10%;
            left: 10%;
            animation-delay: 0s;
        }

        .light-2 {
            width: 250px;
            height: 250px;
            background: var(--red);
            bottom: 15%;
            right: 15%;
            animation-delay: 2s;
        }

        @keyframes float {
            0%, 100% {
                transform: translate(0, 0) scale(1);
                opacity: 0.3;
            }
            50% {
                transform: translate(30px, -30px) scale(1.1);
                opacity: 0.5;
            }
        }

        /* Filter Section */
        .filter-section {
            background: var(--light-gray);
            padding: 40px 20px;
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
        }

        .filter-container {
            max-width: 1200px;
            margin: 0 auto;
            display: flex;
            justify-content: center;
            align-items: center;
            gap: 15px;
            flex-wrap: wrap;
        }

        .filter-label {
            font-weight: 700;
            color: var(--dark-blue);
            font-size: 1.1rem;
        }

        .filter-btn {
            padding: 10px 25px;
            background: var(--white);
            color: var(--dark-blue);
            border: 2px solid var(--light-blue);
            border-radius: 50px;
            font-weight: 600;
            font-size: 0.95rem;
            cursor: pointer;
            transition: var(--transition);
            font-family: 'Inter', sans-serif;
        }

        .filter-btn:hover,
        .filter-btn:focus {
            background: var(--light-blue);
            color: var(--white);
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(52, 152, 219, 0.3);
            outline: none;
        }

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

        /* Main Content */
        main {
            padding: 80px 20px;
            min-height: 50vh;
        }

        .container {
            max-width: 1400px;
            margin: 0 auto;
        }

        /* Portfolio Grid */
        .portfolio-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(380px, 1fr));
            gap: 40px;
            margin-bottom: 60px;
        }

        @media (max-width: 480px) {
            .portfolio-grid {
                grid-template-columns: 1fr;
            }
        }

        /* Portfolio Card */
        .portfolio-card {
            background: var(--white);
            border-radius: 16px;
            overflow: hidden;
            box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
            transition: var(--transition);
            border: 3px solid transparent;
            opacity: 0;
            transform: translateY(30px);
        }

        .portfolio-card.visible {
            opacity: 1;
            transform: translateY(0);
        }

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

        .portfolio-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 20px 60px rgba(52, 152, 219, 0.3);
            border-color: var(--light-blue);
        }

        /* Portfolio Image */
        .portfolio-image {
            position: relative;
            width: 100%;
            height: 280px;
            overflow: hidden;
            background: linear-gradient(135deg, var(--dark-blue), var(--light-blue));
        }

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

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

        .portfolio-overlay {
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: linear-gradient(to bottom, transparent 0%, rgba(44, 62, 80, 0.9) 100%);
            display: flex;
            align-items: flex-end;
            padding: 20px;
            opacity: 0;
            transition: var(--transition);
        }

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

        .view-project-btn {
            padding: 10px 25px;
            background: var(--red);
            color: var(--white);
            text-decoration: none;
            border-radius: 50px;
            font-weight: 600;
            font-size: 0.9rem;
            transition: var(--transition);
            border: 2px solid transparent;
        }

        .view-project-btn:hover,
        .view-project-btn:focus {
            background: var(--white);
            color: var(--red);
            border-color: var(--red);
            transform: scale(1.05);
            outline: none;
        }

        /* Portfolio Content */
        .portfolio-content {
            padding: 30px;
        }

        .portfolio-category {
            display: inline-block;
            padding: 5px 15px;
            background: var(--light-gray);
            color: var(--light-blue);
            border-radius: 20px;
            font-size: 0.85rem;
            font-weight: 600;
            margin-bottom: 15px;
        }

        .portfolio-title {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--dark-blue);
            margin-bottom: 12px;
            line-height: 1.3;
        }

        .portfolio-description {
            color: var(--dark-gray);
            line-height: 1.7;
            margin-bottom: 20px;
        }

        .portfolio-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin-bottom: 20px;
        }

        .tag {
            padding: 4px 12px;
            background: rgba(52, 152, 219, 0.1);
            color: var(--light-blue);
            border-radius: 15px;
            font-size: 0.8rem;
            font-weight: 500;
        }

        .portfolio-meta {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding-top: 20px;
            border-top: 2px solid var(--light-gray);
        }

        .meta-item {
            display: flex;
            align-items: center;
            gap: 8px;
            color: var(--dark-gray);
            font-size: 0.9rem;
        }

        .meta-icon {
            color: var(--light-blue);
            font-size: 1.1rem;
        }

        /* CTA Section */
        .cta-section {
            background: linear-gradient(135deg, var(--dark-blue) 0%, #1a252f 100%);
            padding: 80px 20px;
            text-align: center;
            color: var(--white);
            position: relative;
            overflow: hidden;
        }

        .cta-section h2 {
            font-size: clamp(2rem, 4vw, 3rem);
            font-weight: 900;
            margin-bottom: 20px;
            text-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
        }

        .cta-section p {
            font-size: clamp(1.1rem, 2vw, 1.3rem);
            margin-bottom: 40px;
            opacity: 0.95;
            max-width: 700px;
            margin-left: auto;
            margin-right: auto;
        }

        .cta-button {
            display: inline-block;
            padding: 18px 45px;
            background: var(--red);
            color: var(--white);
            text-decoration: none;
            font-weight: 700;
            font-size: 1.1rem;
            border-radius: 50px;
            transition: var(--transition);
            box-shadow: 0 8px 25px rgba(231, 76, 60, 0.4);
            border: 3px solid transparent;
        }

        .cta-button:hover,
        .cta-button:focus {
            background: var(--light-blue);
            transform: translateY(-3px) scale(1.05);
            box-shadow: 0 12px 35px rgba(52, 152, 219, 0.6);
            border-color: var(--white);
            outline: none;
        }

        /* Footer */
        footer {
            background: #1a252f;
            color: var(--white);
            padding: 50px 20px 30px;
            text-align: center;
        }

        .footer-links {
            display: flex;
            justify-content: center;
            gap: 30px;
            margin-bottom: 25px;
            flex-wrap: wrap;
        }

        .footer-links a {
            color: var(--white);
            text-decoration: none;
            font-weight: 500;
            transition: var(--transition);
            border-bottom: 2px solid transparent;
        }

        .footer-links a:hover,
        .footer-links a:focus {
            color: var(--light-blue);
            border-bottom-color: var(--light-blue);
            outline: none;
        }

        .footer-text {
            opacity: 0.8;
            font-size: 0.95rem;
        }

        /* Mobile Adjustments */
        @media (max-width: 768px) {
            main {
                padding: 60px 20px 100px;
            }

            .hero {
                min-height: 50vh;
                padding: 100px 20px 60px;
            }

            .hero-stats {
                gap: 30px;
            }

            .filter-section {
                padding: 30px 15px;
            }

            .portfolio-grid {
                gap: 30px;
            }
        }

        /* Focus Styles for Accessibility */
        *:focus {
            outline: 3px solid var(--light-blue);
            outline-offset: 2px;
        }

        a:focus,
        button:focus {
            outline: 3px solid var(--red);
            outline-offset: 3px;
        }

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