:root {
            --bg-primary: #0a0e27;
            --bg-secondary: #151935;
            --bg-card: rgba(255, 255, 255, 0.03);
            --bg-card-hover: rgba(255, 255, 255, 0.06);
            --text-primary: #ffffff;
            --text-secondary: #94a3b8;
            --text-muted: #64748b;
            --accent-primary: #3b82f6;
            --accent-secondary: #60a5fa;
            --accent-gradient: linear-gradient(135deg, #3b82f6 0%, #60a5fa 100%);
            --border-color: rgba(255, 255, 255, 0.1);
            --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
            --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.2);
            --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.3);
            --header-height: 70px;
            --max-width: 1200px;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            overflow-wrap: break-word;
            word-wrap: break-word;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
            background: var(--bg-primary);
            color: var(--text-primary);
            line-height: 1.6;
            overflow-x: hidden;
            position: relative;
        }

        /* Animated background gradient - closer to original */
        body::before {
            content: '';
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: radial-gradient(circle at 20% 50%, rgba(59, 130, 246, 0.1) 0%, transparent 50%),
                radial-gradient(circle at 80% 80%, rgba(96, 165, 250, 0.08) 0%, transparent 50%),
                radial-gradient(circle at 40% 20%, rgba(147, 51, 234, 0.05) 0%, transparent 50%);
            pointer-events: none;
            z-index: 1;
            animation: gradientShift 20s ease infinite;
        }

        /* Subtle transform-based animation to avoid sliding */
        @keyframes gradientShift {
            0% {
                transform: scale(1) translateX(0);
                opacity: 1;
            }

            50% {
                transform: scale(1.5) translateX(10px);
                opacity: 0.9;
            }

            100% {
                transform: scale(1) translateX(0);
                opacity: 1;
            }
        }

        /* Header with glassmorphism */
        header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: var(--header-height);
            background: rgba(10, 14, 39, 0.8);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid var(--border-color);
            z-index: 1000;
            transition: all 0.3s ease;
        }

        header.scrolled {
            height: 60px;
            background: rgba(10, 14, 39, 0.95);
        }

        .header-content {
            max-width: var(--max-width);
            margin: 0 auto;
            height: 100%;
            padding: 0 2rem;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }

        .logo {
            font-family: 'Space Grotesk', sans-serif;
            font-size: 1.5rem;
            font-weight: 700;
            background: var(--accent-gradient);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            letter-spacing: -0.5px;
        }

        nav ul {
            list-style: none;
            display: flex;
            gap: 2rem;
            align-items: center;
        }

        nav a {
            color: var(--text-secondary);
            text-decoration: none;
            font-weight: 500;
            transition: all 0.3s ease;
            position: relative;
            padding: 0.5rem 0;
        }

        nav a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--accent-gradient);
            transition: width 0.3s ease;
        }

        nav a:hover {
            color: var(--text-primary);
        }

        nav a:hover::after {
            width: 100%;
        }

        /* Main content */
        main {
            margin-top: var(--header-height);
            position: relative;
            z-index: 2;
        }

        /* Hero Section */
        .hero {
            min-height: calc(100vh - var(--header-height));
            display: flex;
            align-items: center;
            padding: 4rem 2rem;
            position: relative;
            overflow: hidden;
        }

        .hero-content {
            max-width: var(--max-width);
            margin: 0 auto;
            display: grid;
            grid-template-columns: 1fr auto;
            gap: 4rem;
            align-items: center;
        }

        .hero-text h1 {
            font-family: 'Space Grotesk', sans-serif;
            font-size: clamp(2.5rem, 5vw, 4rem);
            font-weight: 700;
            line-height: 1.1;
            margin-bottom: 1rem;
            background: linear-gradient(135deg, var(--text-primary) 0%, var(--text-secondary) 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            animation: fadeInUp 0.8s ease;
        }

        .hero-text .subtitle {
            font-family: 'JetBrains Mono', monospace;
            color: var(--accent-secondary);
            font-size: 1.1rem;
            margin-bottom: 2rem;
            animation: fadeInUp 0.8s ease 0.1s both;
        }

        .hero-text p {
            font-size: 1.1rem;
            color: var(--text-secondary);
            line-height: 1.8;
            margin-bottom: 1.5rem;
            animation: fadeInUp 0.8s ease 0.2s both;
        }

        .specialties {
            margin-top: 2rem;
            animation: fadeInUp 0.8s ease 0.3s both;
        }

        .specialties h3 {
            font-size: 0.9rem;
            color: var(--text-muted);
            text-transform: uppercase;
            letter-spacing: 0.1em;
            margin-bottom: 1rem;
        }

        .specialty-tags {
            display: flex;
            gap: 1rem;
            flex-wrap: wrap;
        }

        .tag {
            padding: 0.5rem 1.5rem;
            background: rgba(59, 130, 246, 0.1);
            border: 1px solid rgba(59, 130, 246, 0.3);
            border-radius: 999px;
            font-size: 0.9rem;
            transition: all 0.3s ease;
            cursor: default;
        }

        .tag:hover {
            background: rgba(59, 130, 246, 0.2);
            border-color: var(--accent-primary);
            transform: translateY(-2px);
        }

        .profile-image-container {
            position: relative;
            animation: fadeInUp 0.8s ease 0.4s both;
        }

        .profile-image {
            width: 350px;
            height: 350px;
            border-radius: 20px;
            overflow: hidden;
            position: relative;
            box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
        }

        .profile-image::before {
            content: '';
            position: absolute;
            inset: -2px;
            background: var(--accent-gradient);
            border-radius: 20px;
            padding: 2px;
            -webkit-mask-composite: xor;
            mask-composite: exclude;
            opacity: 0.6;
            z-index: -1;
        }

        .profile-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            display: block;
        }

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

            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        /* Section styles */
        section {
            padding: 5rem 2rem;
            position: relative;
            z-index: 2;
        }

        .section-header {
            text-align: center;
            margin-bottom: 4rem;
        }

        .section-title {
            font-family: 'Space Grotesk', sans-serif;
            font-size: clamp(2rem, 4vw, 3rem);
            font-weight: 700;
            margin-bottom: 1rem;
            background: var(--accent-gradient);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .section-subtitle {
            color: var(--text-secondary);
            font-size: 1.1rem;
        }

        /* Certificate Cards */
        .certificates-grid {
            max-width: var(--max-width);
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
            gap: 2rem;
        }

        .certificate-card {
            background: var(--bg-card);
            backdrop-filter: blur(10px);
            border: 1px solid var(--border-color);
            border-radius: 16px;
            padding: 2rem;
            transition: all 0.3s ease;
            cursor: pointer;
            position: relative;
            overflow: hidden;
        }

        .certificate-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 4px;
            background: var(--accent-gradient);
            transform: translateX(-100%);
            transition: transform 0.3s ease;
        }

        .certificate-card:hover {
            background: var(--bg-card-hover);
            transform: translateY(-4px);
            box-shadow: 0 12px 40px rgba(59, 130, 246, 0.1);
        }

        .certificate-card:hover::before {
            transform: translateX(0);
        }

        .cert-icon {
            width: 60px;
            height: 60px;
            background: rgba(59, 130, 246, 0.1);
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 1.5rem;
            font-size: 1.5rem;
        }

        .cert-title {
            font-size: 1.3rem;
            font-weight: 600;
            margin-bottom: 0.5rem;
        }

        .cert-issuer {
            font-family: 'JetBrains Mono', monospace;
            color: var(--accent-secondary);
            font-size: 0.9rem;
            margin-bottom: 1rem;
        }

        .cert-description {
            color: var(--text-secondary);
            line-height: 1.6;
        }

        /* Experience Timeline */
        .timeline {
            max-width: 800px;
            margin: 0 auto;
            position: relative;
        }

        .timeline::before {
            content: '';
            position: absolute;
            left: 50px;
            top: 0;
            bottom: 0;
            width: 2px;
            background: var(--border-color);
        }

        .timeline-item {
            position: relative;
            margin-bottom: 3rem;
            padding-left: 100px;
            animation: fadeInUp 0.8s ease both;
        }

        .timeline-marker {
            position: absolute;
            left: 40px;
            width: 20px;
            height: 20px;
            background: var(--bg-primary);
            border: 3px solid var(--accent-primary);
            border-radius: 50%;
            z-index: 1;
        }

        .timeline-card {
            background: var(--bg-card);
            backdrop-filter: blur(10px);
            border: 1px solid var(--border-color);
            border-radius: 16px;
            padding: 2rem;
            transition: all 0.3s ease;
        }

        .timeline-card:hover {
            background: var(--bg-card-hover);
            transform: translateX(4px);
        }

        .company-logo {
            width: 50px;
            height: 50px;
            margin-bottom: 1rem;
            opacity: 0.8;
        }

        .timeline-title {
            font-size: 1.3rem;
            font-weight: 600;
            margin-bottom: 0.5rem;
        }

        .timeline-company {
            font-family: 'JetBrains Mono', monospace;
            color: var(--accent-secondary);
            font-size: 0.9rem;
            margin-bottom: 1rem;
        }

        .timeline-description {
            color: var(--text-secondary);
            line-height: 1.6;
        }

        /* Contact section */
        .contact-content {
            max-width: 600px;
            margin: auto;
            text-align: center;
        }

        .contact-links {
            display: flex;
            justify-content: center;
            gap: 2rem;
            margin-top: 3rem;
        }

        .contact-link {
            display: flex;
            align-items: center;
            gap: 0.75rem;
            padding: 1rem 2rem;
            background: var(--bg-card);
            backdrop-filter: blur(10px);
            border: 1px solid var(--border-color);
            border-radius: 12px;
            color: var(--text-primary);
            text-decoration: none;
            transition: all 0.3s ease;
        }

        .contact-link:hover {
            background: var(--accent-primary);
            border-color: var(--accent-primary);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(59, 130, 246, 0.3);
        }

        .contact-icon {
            width: 24px;
            height: 24px;
        }

        /* Footer */
        footer {
            background: var(--bg-secondary);
            border-top: 1px solid var(--border-color);
            padding: 2rem;
            text-align: center;
            color: var(--text-secondary);
        }

        footer a {
            color: var(--accent-secondary);
            text-decoration: none;
            transition: opacity 0.3s ease;
        }

        footer a:hover {
            opacity: 0.8;
        }

        /* Mobile menu */
        .mobile-menu-btn {
            display: none;
            flex-direction: column;
            gap: 4px;
            background: none;
            border: none;
            cursor: pointer;
            padding: 0.5rem;
        }

        .mobile-menu-btn span {
            width: 24px;
            height: 2px;
            background: var(--text-primary);
            transition: all 0.3s ease;
        }

        /* Modal */
        .modal {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(0, 0, 0, 0.9);
            z-index: 2000;
            padding: 2rem;
            cursor: pointer;
            backdrop-filter: blur(10px);
        }

        .modal.active {
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .modal-content {
            max-width: 90%;
            max-height: 90%;
            animation: scaleIn 0.3s ease;
        }

        @keyframes scaleIn {
            from {
                transform: scale(0.9);
                opacity: 0;
            }

            to {
                transform: scale(1);
                opacity: 1;
            }
        }

        #timeline-mm-lab {
            animation-delay: 0.1s;
        }

        #timeline-nash {
            animation-delay: 0.2s;
        }

        #timeline-alcatel {
            animation-delay: 0.3s;
        }

        #timeline-fh-kiel {
            animation-delay: 0.4s;
        }

        #contact-intro {
            color: var(--text-secondary);
            margin-bottom: 2rem;
        }

        /* inter-regular - latin */
        @font-face {
            font-display: swap;
            /* Check https://developer.mozilla.org/en-US/docs/Web/CSS/@font-face/font-display for other options. */
            font-family: 'Inter';
            font-style: normal;
            font-weight: 400;
            src: url('../fonts/inter-v19-latin-regular.woff2') format('woff2');
            /* Chrome 36+, Opera 23+, Firefox 39+, Safari 12+, iOS 10+ */
        }

        /* inter-500 - latin */
        @font-face {
            font-display: swap;
            /* Check https://developer.mozilla.org/en-US/docs/Web/CSS/@font-face/font-display for other options. */
            font-family: 'Inter';
            font-style: normal;
            font-weight: 500;
            src: url('../fonts/inter-v19-latin-500.woff2') format('woff2');
            /* Chrome 36+, Opera 23+, Firefox 39+, Safari 12+, iOS 10+ */
        }

        /* inter-600 - latin */
        @font-face {
            font-display: swap;
            /* Check https://developer.mozilla.org/en-US/docs/Web/CSS/@font-face/font-display for other options. */
            font-family: 'Inter';
            font-style: normal;
            font-weight: 600;
            src: url('../fonts/inter-v19-latin-600.woff2') format('woff2');
            /* Chrome 36+, Opera 23+, Firefox 39+, Safari 12+, iOS 10+ */
        }

        /* inter-700 - latin */
        @font-face {
            font-display: swap;
            /* Check https://developer.mozilla.org/en-US/docs/Web/CSS/@font-face/font-display for other options. */
            font-family: 'Inter';
            font-style: normal;
            font-weight: 700;
            src: url('../fonts/inter-v19-latin-700.woff2') format('woff2');
            /* Chrome 36+, Opera 23+, Firefox 39+, Safari 12+, iOS 10+ */
        }


        /* jetbrains-mono-regular - latin */
        @font-face {
            font-display: swap;
            /* Check https://developer.mozilla.org/en-US/docs/Web/CSS/@font-face/font-display for other options. */
            font-family: 'JetBrains Mono';
            font-style: normal;
            font-weight: 400;
            src: url('../fonts/jetbrains-mono-v23-latin-regular.woff2') format('woff2');
            /* Chrome 36+, Opera 23+, Firefox 39+, Safari 12+, iOS 10+ */
        }

        /* jetbrains-mono-600 - latin */
        @font-face {
            font-display: swap;
            /* Check https://developer.mozilla.org/en-US/docs/Web/CSS/@font-face/font-display for other options. */
            font-family: 'JetBrains Mono';
            font-style: normal;
            font-weight: 600;
            src: url('../fonts/jetbrains-mono-v23-latin-600.woff2') format('woff2');
            /* Chrome 36+, Opera 23+, Firefox 39+, Safari 12+, iOS 10+ */
        }


        /* space-grotesk-regular - latin */
        @font-face {
            font-display: swap;
            /* Check https://developer.mozilla.org/en-US/docs/Web/CSS/@font-face/font-display for other options. */
            font-family: 'Space Grotesk';
            font-style: normal;
            font-weight: 400;
            src: url('../fonts/space-grotesk-v21-latin-regular.woff2') format('woff2');
            /* Chrome 36+, Opera 23+, Firefox 39+, Safari 12+, iOS 10+ */
        }

        /* space-grotesk-500 - latin */
        @font-face {
            font-display: swap;
            /* Check https://developer.mozilla.org/en-US/docs/Web/CSS/@font-face/font-display for other options. */
            font-family: 'Space Grotesk';
            font-style: normal;
            font-weight: 500;
            src: url('../fonts/space-grotesk-v21-latin-500.woff2') format('woff2');
            /* Chrome 36+, Opera 23+, Firefox 39+, Safari 12+, iOS 10+ */
        }

        /* space-grotesk-700 - latin */
        @font-face {
            font-display: swap;
            /* Check https://developer.mozilla.org/en-US/docs/Web/CSS/@font-face/font-display for other options. */
            font-family: 'Space Grotesk';
            font-style: normal;
            font-weight: 700;
            src: url('../fonts/space-grotesk-v21-latin-700.woff2') format('woff2');
            /* Chrome 36+, Opera 23+, Firefox 39+, Safari 12+, iOS 10+ */
        }


        .modal-close {
            position: absolute;
            top: 2rem;
            right: 2rem;
            width: 40px;
            height: 40px;
            background: rgba(255, 255, 255, 0.1);
            border: none;
            border-radius: 50%;
            color: white;
            font-size: 1.5rem;
            cursor: pointer;
            transition: all 0.3s ease;
        }



        .modal-close:hover {
            background: rgba(255, 255, 255, 0.2);
            transform: rotate(90deg);
        }

        /* Profile image for mobile */
        .profile-image-mobile {
            display: none;
        }

        @media (max-width: 968px) {
            .profile-image-mobile {
                display: block;
                width: 180px;
                height: 180px;
                margin: 2rem auto 2rem auto;
                border-radius: 16px;
                overflow: hidden;
                box-shadow: 0 8px 24px rgba(59, 130, 246, 0.15);
                background: var(--bg-card);
            }

            .profile-image-mobile img {
                width: 100%;
                height: 100%;
                object-fit: cover;
                display: block;
            }
        }

        /* Responsive */
        @media (max-width: 968px) {
            .hero-content {
                display: flex;
                flex-direction: column;
                text-align: center;
            }

            .hero-text {
                order: 1;
            }

            .profile-image-container {
                display: none;
                order: 2;
                margin-top: 2rem;
            }

            .profile-image {
                width: 280px;
                height: 280px;
                margin: 0 auto;
            }

            .floating-card {
                display: none;
            }

            .specialty-tags {
                justify-content: center;
            }

            .timeline::before {
                left: 20px;
            }

            .timeline-item {
                padding-left: 60px;
            }

            .timeline-marker {
                left: 10px;
            }
        }

        @media (max-width: 768px) {
            .mobile-menu-btn {
                display: flex;
            }

            nav {
                position: fixed;
                top: var(--header-height);
                right: -100%;
                width: 80%;
                max-width: 300px;
                height: calc(100vh - var(--header-height));
                background: var(--bg-secondary);
                padding: 2rem;
                transition: right 0.3s ease;
            }

            nav.active {
                right: 0;
            }

            nav ul {
                flex-direction: column;
                gap: 2rem;
                align-items: flex-start;
            }

            .profile-image {
                width: 240px;
                height: 240px;
            }

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

            .contact-links {
                flex-direction: column;
                align-items: center;
            }
        }

        @media (max-width: 480px) {
            .profile-image {
                width: 200px;
                height: 200px;
            }

            .hero-text h1 {
                font-size: 2.5rem;
            }

            .hero-text .subtitle {
                font-size: 1rem;
            }
        }