:root {
    --primary-color: #2563eb;
    --secondary-color: #1e40af;
    --accent-color: #3b82f6;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-dark: #111827;
    --border-color: #e5e7eb;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

/* Language Switcher */
.lang-switcher-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-left: 1rem;
    padding-left: 1rem;
    border-left: 1px solid var(--border-color);
}

.lang-link {
    text-decoration: none;
    transition: transform 0.2s ease, opacity 0.2s ease;
    display: inline-block;
    line-height: 1;
    padding: 0.25rem;
}

.flag-icon {
    display: inline-block;
    width: 24px;
    height: 18px;
    background-size: cover;
    background-position: center;
    border-radius: 2px;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.flag-gb {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 60 30'%3E%3Cpath fill='%23012169' d='M0 0h60v30H0z'/%3E%3Cpath fill='%23FFF' d='M0 0l60 30M60 0L0 30' stroke='%23FFF' stroke-width='6'/%3E%3Cpath fill='%23C8102E' d='M0 0l60 30M60 0L0 30' stroke='%23C8102E' stroke-width='4'/%3E%3Cpath fill='%23012169' d='M30 0v30M0 15h60' stroke='%23FFF' stroke-width='10'/%3E%3Cpath fill='%23C8102E' d='M30 0v30M0 15h60' stroke='%23C8102E' stroke-width='6'/%3E%3C/svg%3E");
}

.flag-de {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 60 30'%3E%3Cpath fill='%23000' d='M0 0h60v10H0z'/%3E%3Cpath fill='%23DD0000' d='M0 10h60v10H0z'/%3E%3Cpath fill='%23FFCE00' d='M0 20h60v10H0z'/%3E%3C/svg%3E");
}

.lang-link:hover .flag-icon {
    transform: scale(1.15);
    opacity: 0.9;
}

.lang-link.active .flag-icon {
    opacity: 1;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.2));
}

.lang-link.active:hover .flag-icon {
    transform: scale(1);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    color: var(--text-primary);
    line-height: 1.6;
    background-color: var(--bg-primary);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow);
    z-index: 1000;
    transition: all 0.3s ease;
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
    letter-spacing: -0.5px;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-links a {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: width 0.3s ease;
}

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

.nav-links a:hover::after {
    width: 100%;
}

.menu-toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    gap: 4px;
}

.menu-toggle span {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    transition: all 0.3s ease;
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-align: center;
    position: relative;
    padding-top: 80px;
}

.hero-content {
    animation: fadeInUp 1s ease;
}

.hero-image-wrapper {
    margin-bottom: 2rem;
    animation: fadeInUp 0.8s ease 0.2s both;
}

.hero-image {
    width: 250px;
    height: 250px;
    border-radius: 50%;
    object-fit: cover;
    border: 5px solid rgba(255, 255, 255, 0.3);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    transition: transform 0.3s ease;
}

.hero-image:hover {
    transform: scale(1.05);
}

.hero-name {
    font-size: 4rem;
    font-weight: 700;
    margin-bottom: 1rem;
    letter-spacing: -1px;
}

.hero-title {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    opacity: 0.9;
}

.hero-tagline {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    opacity: 0.85;
    font-style: italic;
    font-weight: 300;
}

.hero-location {
    font-size: 1.1rem;
    margin-bottom: 2rem;
    opacity: 0.8;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    padding: 0.75rem 2rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    display: inline-block;
    border: 2px solid transparent;
}

.btn-primary {
    background: white;
    color: var(--primary-color);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: transparent;
    color: white;
    border-color: white;
}

.btn-secondary:hover {
    background: white;
    color: var(--primary-color);
}

.scroll-indicator {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    color: white;
    opacity: 0.7;
    animation: bounce 2s infinite;
}

.arrow {
    width: 20px;
    height: 20px;
    border-right: 2px solid white;
    border-bottom: 2px solid white;
    transform: rotate(45deg);
}

/* Sections */
section {
    padding: 5rem 0;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 3rem;
    text-align: center;
    color: var(--text-primary);
}

/* About Section */
.about {
    background: var(--bg-primary);
}

.about-content {
    max-width: 800px;
    margin: 0 auto;
}

.about-text p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.8;
}

.about-expertise {
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 2px solid var(--border-color);
    font-size: 1rem !important;
}

.about-expertise strong {
    color: var(--text-primary);
    display: block;
    margin-bottom: 0.5rem;
}

.ai-focus-section {
    margin-top: 3rem;
    padding: 2.5rem;
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.08) 0%, rgba(59, 130, 246, 0.05) 100%);
    border-radius: 16px;
    border: 1px solid rgba(37, 99, 235, 0.2);
}

.ai-focus-content {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 2rem;
    align-items: start;
}

.ai-icon-wrapper {
    flex-shrink: 0;
}

.ai-icon {
    font-size: 4rem;
    width: 100px;
    height: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--accent-color) 100%);
    border-radius: 20px;
    box-shadow: 0 8px 20px rgba(37, 99, 235, 0.3);
    animation: pulse 3s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
        box-shadow: 0 8px 20px rgba(37, 99, 235, 0.3);
    }
    50% {
        transform: scale(1.05);
        box-shadow: 0 12px 30px rgba(37, 99, 235, 0.4);
    }
}

.ai-text h3 {
    font-size: 1.8rem;
    color: var(--text-primary);
    margin-bottom: 1rem;
    font-weight: 600;
}

.ai-text p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 1rem;
}

.legacy-projects-section {
    margin-top: 4rem;
    padding-top: 3rem;
    border-top: 2px solid var(--border-color);
}

.legacy-title {
    font-size: 1.8rem;
    color: var(--text-primary);
    margin-bottom: 2rem;
    text-align: center;
    font-weight: 600;
}

.legacy-projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.legacy-project-card {
    background: var(--bg-secondary);
    padding: 1.5rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
}

.legacy-project-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.legacy-project-card h4 {
    font-size: 1.2rem;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.legacy-year {
    color: var(--primary-color);
    font-weight: 600;
    font-size: 0.9rem;
    margin-bottom: 0.75rem;
}

.legacy-description {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: 1rem;
}

.legacy-technologies {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.tech-tag-small {
    background: white;
    color: var(--primary-color);
    padding: 0.3rem 0.7rem;
    border-radius: 12px;
    font-size: 0.8rem;
    font-weight: 500;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

/* Experience Section */
.experience {
    background: var(--bg-secondary);
}

.timeline {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
    padding-left: 2rem;
}

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

.timeline-item {
    position: relative;
    margin-bottom: 3rem;
    padding-left: 3rem;
}

.timeline-marker {
    position: absolute;
    left: -1.5rem;
    top: 0.5rem;
    width: 1rem;
    height: 1rem;
    border-radius: 50%;
    background: var(--primary-color);
    border: 3px solid var(--bg-secondary);
    z-index: 1;
}

.timeline-content {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.timeline-content:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.timeline-header {
    display: flex;
    justify-content: space-between;
    align-items: start;
    margin-bottom: 0.5rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.timeline-header h3 {
    font-size: 1.5rem;
    color: var(--text-primary);
}

.timeline-date {
    color: var(--text-secondary);
    font-weight: 500;
}

.timeline-content h4 {
    color: var(--primary-color);
    font-size: 1.1rem;
    margin-bottom: 1rem;
}

.timeline-content p {
    color: var(--text-secondary);
    line-height: 1.7;
}

/* Skills Section */
.skills {
    background: var(--bg-primary);
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    max-width: 1000px;
    margin: 0 auto;
}

.skill-category {
    background: var(--bg-secondary);
    padding: 2rem;
    border-radius: 12px;
    transition: transform 0.3s ease;
}

.skill-category:hover {
    transform: translateY(-5px);
}

.skill-category h3 {
    font-size: 1.3rem;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.skill-items {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.skill-tag {
    background: white;
    color: var(--primary-color);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 500;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
}

.skill-tag:hover {
    background: var(--primary-color);
    color: white;
    transform: scale(1.05);
}

/* Projects Section */
.projects {
    background: var(--bg-secondary);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.project-card {
    background: white;
    padding: 2.5rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
    text-align: center;
    transition: all 0.3s ease;
}

.project-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
}

.project-card.featured {
    border: 2px solid var(--primary-color);
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.05) 0%, rgba(255, 255, 255, 1) 100%);
}

.project-card.featured .project-icon {
    font-size: 3.5rem;
}

.project-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.project-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.project-card p {
    color: var(--text-secondary);
    line-height: 1.7;
}

.project-year {
    color: var(--primary-color);
    font-weight: 600;
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.project-position {
    color: var(--text-primary);
    font-weight: 500;
    margin-bottom: 1rem;
    font-size: 0.95rem;
}

.project-description {
    margin-bottom: 1.5rem;
}

.project-technologies {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 1rem;
}

.tech-tag {
    background: var(--primary-color);
    color: white;
    padding: 0.4rem 0.8rem;
    border-radius: 15px;
    font-size: 0.85rem;
    font-weight: 500;
}

.project-link-wrapper {
    margin-top: 1.5rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.project-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    transition: all 0.3s ease;
}

.project-link:hover {
    color: var(--secondary-color);
    transform: translateX(3px);
}

.link-icon {
    font-size: 1rem;
}

.projects-note {
    text-align: center;
    color: var(--text-secondary);
    font-style: italic;
    margin-top: 2rem;
}

/* Languages Section */
.languages {
    background: var(--bg-primary);
}

.languages-content {
    max-width: 600px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.language-item {
    background: var(--bg-secondary);
    padding: 1.5rem 2rem;
    border-radius: 12px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
}

.language-item:hover {
    transform: translateX(5px);
    box-shadow: var(--shadow-lg);
}

.language-name {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-primary);
}

.language-level {
    color: var(--text-secondary);
    font-weight: 500;
}

/* Contact Section */
.contact {
    background: var(--bg-secondary);
}

.contact-content {
    max-width: 900px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
}

.contact-content.contact-only {
    grid-template-columns: 1fr;
    justify-items: center;
}

.contact-info p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    line-height: 1.8;
}

.contact-note {
    margin: 2rem 0;
    padding: 1.5rem;
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.08) 0%, rgba(59, 130, 246, 0.05) 100%);
    border-radius: 12px;
    border-left: 4px solid var(--primary-color);
}

.contact-note-text {
    color: var(--text-secondary);
    line-height: 1.7;
    font-size: 1rem;
    margin: 0;
}

.contact-note-text strong {
    color: var(--text-primary);
}

.contact-links {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.contact-link {
    display: flex;
    align-items: center;
    gap: 1rem;
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: 8px;
    transition: all 0.3s ease;
}

.contact-link:hover {
    background: var(--primary-color);
    color: white;
    transform: translateX(5px);
}

.contact-icon {
    font-size: 1.5rem;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group label {
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-primary);
}

.form-group input,
.form-group textarea {
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-family: inherit;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.form-group textarea {
    resize: vertical;
}

/* Footer */
.footer {
    background: var(--bg-dark);
    color: white;
    text-align: center;
    padding: 2rem 0;
}

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

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateX(-50%) translateY(0);
    }
    40% {
        transform: translateX(-50%) translateY(-10px);
    }
    60% {
        transform: translateX(-50%) translateY(-5px);
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-links {
        position: fixed;
        top: 70px;
        left: -100%;
        flex-direction: column;
        background: white;
        width: 100%;
        padding: 2rem;
        box-shadow: var(--shadow-lg);
        transition: left 0.3s ease;
    }

    .nav-links.active {
        left: 0;
    }

    .lang-switcher-item {
        margin-left: 0;
        padding-left: 0;
        border-left: none;
        border-top: 1px solid var(--border-color);
        padding-top: 1rem;
        margin-top: 1rem;
        justify-content: center;
    }

    .menu-toggle {
        display: flex;
    }

    .hero-image {
        width: 150px;
        height: 150px;
    }

    .ai-focus-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .ai-icon {
        margin: 0 auto 1.5rem;
    }

    .hero-name {
        font-size: 2.5rem;
    }

    .hero-title {
        font-size: 1.2rem;
    }

    .section-title {
        font-size: 2rem;
    }

    .contact-content {
        grid-template-columns: 1fr;
    }

    .timeline {
        padding-left: 1.5rem;
    }

    .timeline-item {
        padding-left: 2rem;
    }

    .timeline-header {
        flex-direction: column;
    }

    .container {
        padding: 0 1rem;
    }
}

@media (max-width: 480px) {
    .hero-name {
        font-size: 2rem;
    }

    .hero-buttons {
        flex-direction: column;
        width: 100%;
    }

    .btn {
        width: 100%;
        text-align: center;
    }

    .skills-grid,
    .projects-grid {
        grid-template-columns: 1fr;
    }
}

/* Impressum Styles */
.imprint-link {
    color: var(--text-color);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.2s ease;
}

.imprint-link:hover {
    color: var(--primary-color);
    text-decoration: underline;
}

.imprint-section {
    display: none;
    padding: 2rem 0;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    margin-top: 0;
}

.imprint-section.visible {
    display: block;
}

.imprint-section h2 {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.imprint-info {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
    opacity: 0.8;
}

.imprint-content {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.6;
    opacity: 0.8;
}

.imprint-content a {
    color: var(--text-secondary);
    text-decoration: none;
    opacity: 0.8;
    transition: opacity 0.2s ease;
}

.imprint-content a:hover {
    opacity: 1;
    text-decoration: underline;
}

@media (max-width: 768px) {
    .imprint-section {
        padding: 1.5rem 0;
    }
    
    .imprint-section h2 {
        font-size: 1.1rem;
    }
    
    .imprint-content {
        font-size: 0.8rem;
    }
}