/* ============================================
   CSS Custom Properties (Variables)
   ============================================ */
:root {
    /* Colors - Option 1: Wissenschaftlich/Vertrauenswürdig */
    --color-primary: #1e3a8a;
    --color-primary-light: #3b82f6;
    --color-primary-dark: #1e40af;
    --color-secondary: #06b6d4;
    --color-secondary-light: #22d3ee;
    --color-accent: #f97316;
    --color-accent-light: #fb923c;

    /* Neutrals */
    --color-bg: #ffffff;
    --color-bg-alt: #f8fafc;
    --color-bg-dark: #0f172a;
    --color-text: #1e293b;
    --color-text-light: #64748b;
    --color-text-dark: #0f172a;
    --color-border: #e2e8f0;

    /* Typography */
    --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
    --font-display: Georgia, 'Times New Roman', serif;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;

    /* Layout */
    --container-max: 1200px;
    --border-radius: 12px;
    --transition: all 0.3s ease;
}

/* ============================================
   Reset & Base Styles
   ============================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-bg);
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    color: var(--color-text-dark);
}

h1 {
    font-size: clamp(2rem, 5vw, 3.5rem);
}

h2 {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
}

h3 {
    font-size: clamp(1.25rem, 3vw, 1.75rem);
}

p {
    margin-bottom: 1rem;
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: var(--color-secondary);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

ul {
    list-style: none;
}

/* ============================================
   Utility Classes
   ============================================ */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.section {
    padding: var(--spacing-xl) 0;
}

.section-alt {
    background-color: var(--color-bg-alt);
}

.section-title {
    text-align: center;
    margin-bottom: var(--spacing-md);
    font-family: var(--font-display);
    color: var(--color-primary);
}

.section-intro {
    text-align: center;
    color: var(--color-text-light);
    max-width: 600px;
    margin: 0 auto var(--spacing-lg);
    font-size: 1.125rem;
}

/* ============================================
   Buttons
   ============================================ */
.btn {
    display: inline-block;
    padding: 0.875rem 2rem;
    border-radius: var(--border-radius);
    font-weight: 600;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    border: 2px solid transparent;
    font-size: 1rem;
}

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

.btn-primary:hover {
    background-color: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(30, 58, 138, 0.2);
}

.btn-secondary {
    background-color: transparent;
    color: var(--color-primary);
    border-color: var(--color-primary);
}

.btn-secondary:hover {
    background-color: var(--color-primary);
    color: white;
    transform: translateY(-2px);
}

/* ============================================
   Navigation
   ============================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
    z-index: 1000;
    transition: var(--transition);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 1rem;
    padding-bottom: 1rem;
}

.nav-brand a {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary);
    font-family: var(--font-display);
}

.nav-brand .logo {
    display: inline-flex;
    align-items: baseline;
    gap: 0.1rem;
    letter-spacing: 0.02em;
    text-transform: lowercase;
    position: relative;
    padding-bottom: 0.2rem;
}

.nav-brand .logo-text {
    color: var(--color-primary);
}

.nav-brand .logo-dot {
    color: var(--color-accent);
}

.nav-brand .logo-tld {
    color: var(--color-text-light);
    font-weight: 600;
}

.nav-brand .logo::after {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
    border-radius: 999px;
    opacity: 0.85;
}

.nav-menu {
    display: flex;
    gap: var(--spacing-md);
}

.nav-link {
    color: var(--color-text);
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    transition: var(--transition);
}

.nav-link:hover {
    color: var(--color-primary);
    background-color: var(--color-bg-alt);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background-color: var(--color-primary);
    border-radius: 3px;
    transition: var(--transition);
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
    position: relative;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
    color: white;
    padding: calc(var(--spacing-xl) + 80px) 0 var(--spacing-xl);
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(circle at 20% 50%, rgba(6, 182, 212, 0.2) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(249, 115, 22, 0.15) 0%, transparent 50%);
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
    animation: fadeInUp 1s ease;
}

.hero-greeting {
    display: block;
    font-size: 1.25rem;
    font-weight: 400;
    margin-bottom: 0.5rem;
    opacity: 0.9;
}

.hero-title {
    font-family: var(--font-display);
    margin-bottom: var(--spacing-sm);
    color: white;
}

.hero-subtitle {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--color-secondary-light);
    letter-spacing: 0.5px;
}

.hero-tagline {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: rgba(255, 255, 255, 0.95);
    font-style: italic;
}

.hero-description {
    font-size: 1.125rem;
    line-height: 1.8;
    margin-bottom: var(--spacing-md);
    opacity: 0.95;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.hero-cta .btn-primary {
    background-color: var(--color-accent);
}

.hero-cta .btn-primary:hover {
    background-color: var(--color-accent-light);
}

.hero-cta .btn-secondary {
    background-color: rgba(255, 255, 255, 0.1);
    color: white;
    border-color: white;
}

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

.hero-wave {
    position: absolute;
    bottom: -1px;
    left: 0;
    right: 0;
}

.hero-wave svg {
    width: 100%;
    height: auto;
    display: block;
}

/* ============================================
   Blog Section
   ============================================ */
.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.blog-card {
    background: white;
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    transition: var(--transition);
    border: 2px solid var(--color-border);
    display: flex;
    flex-direction: column;
}

.blog-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(30, 58, 138, 0.15);
    border-color: var(--color-secondary);
}

.blog-meta {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
    flex-wrap: wrap;
}

.blog-date {
    color: var(--color-text-light);
    font-size: 0.875rem;
}

.blog-category {
    background-color: var(--color-secondary);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 500;
}

.blog-card h3 {
    margin-bottom: var(--spacing-sm);
    line-height: 1.4;
}

.blog-card h3 a {
    color: var(--color-primary);
    transition: var(--transition);
}

.blog-card h3 a:hover {
    color: var(--color-secondary);
}

.blog-card p {
    color: var(--color-text);
    flex-grow: 1;
    margin-bottom: var(--spacing-sm);
}

.blog-link {
    color: var(--color-secondary);
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    transition: var(--transition);
}

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

.blog-archive {
    text-align: center;
    margin-top: var(--spacing-lg);
}

/* Blog Article Page */
.blog-article {
    max-width: 800px;
    margin: 0 auto;
}

.article-header {
    margin-bottom: var(--spacing-lg);
}

.article-title {
    font-family: var(--font-display);
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

.article-meta {
    display: flex;
    gap: var(--spacing-md);
    color: var(--color-text-light);
    margin-bottom: var(--spacing-md);
    flex-wrap: wrap;
}

.article-content {
    font-size: 1.125rem;
    line-height: 1.8;
}

.article-content h2 {
    color: var(--color-primary);
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
}

.article-content h3 {
    color: var(--color-text-dark);
    margin-top: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
}

.article-content p {
    margin-bottom: var(--spacing-sm);
}

.article-content ul, .article-content ol {
    margin-left: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
}

.article-content li {
    list-style: disc;
    margin-bottom: 0.5rem;
}

.article-back {
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 2px solid var(--color-border);
}

/* ============================================
   Work Areas Section
   ============================================ */
.work-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
}

.work-card {
    background: white;
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    transition: var(--transition);
    border: 2px solid var(--color-border);
}

.work-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(30, 58, 138, 0.15);
    border-color: var(--color-secondary);
}

.work-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
}

.work-card h3 {
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

.work-card p {
    color: var(--color-text);
    margin-bottom: 0;
}

/* ============================================
   CV Section
   ============================================ */
.cv-section {
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-lg);
    border-top: 2px solid var(--color-border);
}

.cv-title {
    color: var(--color-primary);
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

.cv-category {
    margin-bottom: var(--spacing-xl);
}

.cv-category-title {
    color: var(--color-text-dark);
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-xs);
    border-bottom: 3px solid var(--color-primary);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.cv-timeline {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
}

.cv-timeline::before {
    content: '';
    position: absolute;
    left: 100px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--color-border);
}

.cv-item {
    display: grid;
    grid-template-columns: 100px 1fr;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    position: relative;
}

.cv-year {
    text-align: right;
    font-weight: 600;
    color: var(--color-primary);
    padding-right: var(--spacing-sm);
}

.cv-year::after {
    content: '';
    position: absolute;
    left: 100px;
    top: 6px;
    width: 12px;
    height: 12px;
    background: var(--color-secondary);
    border-radius: 50%;
    transform: translateX(-5px);
    box-shadow: 0 0 0 4px white;
}

.cv-content h4 {
    color: var(--color-text-dark);
    margin-bottom: 0.25rem;
}

.cv-content p {
    color: var(--color-text);
    margin-bottom: 0.25rem;
}

.cv-description {
    color: var(--color-text-light);
    font-size: 0.95rem;
}

/* ============================================
   Publications Section
   ============================================ */
.publications-category {
    margin-bottom: var(--spacing-lg);
}

.pub-category-title {
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-xs);
    border-bottom: 2px solid var(--color-border);
}

.publication-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.publication-item {
    padding: var(--spacing-sm) var(--spacing-md);
    background: white;
    border-radius: 8px;
    border-left: 4px solid var(--color-border);
    transition: var(--transition);
}

.publication-item:hover {
    border-left-color: var(--color-secondary);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.publication-item.highlight {
    background: linear-gradient(135deg, #fff 0%, #f0f9ff 100%);
    border-left-color: var(--color-accent);
}

.pub-citation {
    margin-bottom: var(--spacing-xs);
    line-height: 1.6;
}

.pub-citation strong {
    color: var(--color-primary);
}

.pub-meta {
    display: flex;
    gap: var(--spacing-sm);
}

.pub-link {
    font-size: 0.875rem;
    color: var(--color-secondary);
    text-decoration: none;
    padding: 0.25rem 0.75rem;
    background: var(--color-bg-alt);
    border-radius: 4px;
    transition: var(--transition);
}

.pub-link:hover {
    background: var(--color-secondary);
    color: white;
}

/* ============================================
   Teaching Section
   ============================================ */
.teaching-grid {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.teaching-semester {
    background: white;
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.semester-title {
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-xs);
    border-bottom: 2px solid var(--color-border);
}

.course-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.course-item {
    padding: var(--spacing-sm);
    border-left: 4px solid var(--color-secondary);
    padding-left: var(--spacing-sm);
}

.course-item h4 {
    color: var(--color-text-dark);
    margin-bottom: 0.25rem;
}

.course-meta {
    color: var(--color-text-light);
    font-size: 0.875rem;
    margin-bottom: 0.5rem;
}

.course-description {
    color: var(--color-text);
    line-height: 1.6;
    margin-bottom: 0;
}

.course-archive {
    list-style: none;
    padding-left: 0;
}

.course-archive li {
    padding: 0.5rem 0;
    color: var(--color-text);
    border-bottom: 1px solid var(--color-border);
}

.course-archive li:last-child {
    border-bottom: none;
}

.teaching-philosophy {
    margin-top: var(--spacing-lg);
    padding: var(--spacing-md);
    background: white;
    border-radius: var(--border-radius);
    border: 2px solid var(--color-border);
}

.teaching-philosophy h3 {
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

.teaching-philosophy p {
    line-height: 1.8;
    color: var(--color-text);
    margin-bottom: 0;
}

/* ============================================
   About Section
   ============================================ */
.about-intro {
    margin-bottom: var(--spacing-lg);
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--spacing-lg);
    align-items: start;
}

.about-image {
    position: relative;
}

.portrait-image {
    width: 100%;
    max-width: 350px;
    height: auto;
    border-radius: var(--border-radius);
    box-shadow: 0 10px 40px rgba(30, 58, 138, 0.2);
    border: 4px solid white;
    transition: var(--transition);
}

.portrait-image:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 50px rgba(30, 58, 138, 0.25);
}

.about-content h3 {
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

.about-content p {
    font-size: 1.125rem;
    line-height: 1.8;
    color: var(--color-text);
}

.expertise-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.expertise-card {
    background: white;
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    transition: var(--transition);
    border: 2px solid var(--color-border);
}

.expertise-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(30, 58, 138, 0.15);
    border-color: var(--color-secondary);
}

.expertise-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
}

.expertise-card h4 {
    color: var(--color-primary);
    margin-bottom: var(--spacing-xs);
}

.expertise-card p {
    color: var(--color-text-light);
    margin-bottom: 0;
}

/* ============================================
   Services Section
   ============================================ */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
}

.service-card {
    background: white;
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    transition: var(--transition);
    position: relative;
    border: 2px solid var(--color-border);
}

.service-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(30, 58, 138, 0.15);
}

.service-card-highlight {
    border-color: var(--color-accent);
    background: linear-gradient(135deg, #fff 0%, #fff8f0 100%);
}

.service-badge {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    background-color: var(--color-accent);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 600;
}

.service-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
}

.service-card h3 {
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

.service-card p {
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
}

.service-list {
    margin-top: var(--spacing-sm);
}

.service-list li {
    padding: 0.5rem 0;
    color: var(--color-text-light);
    position: relative;
    padding-left: 1.5rem;
}

.service-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--color-secondary);
    font-weight: bold;
}

/* ============================================
   References Section
   ============================================ */
.references-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

.reference-card {
    background: white;
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    transition: var(--transition);
    border-left: 4px solid var(--color-secondary);
}

.reference-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(6, 182, 212, 0.15);
}

.reference-card h3 {
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

.reference-card p {
    color: var(--color-text);
    margin-bottom: 0;
}

/* ============================================
   Contact Section
   ============================================ */
.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    align-items: start;
}

.contact-info h3 {
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

.contact-info p {
    font-size: 1.125rem;
    color: var(--color-text);
    margin-bottom: var(--spacing-md);
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.contact-item {
    display: flex;
    gap: var(--spacing-sm);
    align-items: flex-start;
}

.contact-icon {
    font-size: 1.5rem;
    flex-shrink: 0;
}

.contact-item strong {
    display: block;
    color: var(--color-primary);
    margin-bottom: 0.25rem;
}

.contact-item p {
    margin-bottom: 0;
}

.contact-item a {
    color: var(--color-secondary);
    font-weight: 500;
}

.contact-item a:hover {
    color: var(--color-accent);
}

/* Form Styles */
.contact-form {
    background: white;
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
}

.form-group {
    margin-bottom: var(--spacing-sm);
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--color-text-dark);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.875rem;
    border: 2px solid var(--color-border);
    border-radius: 8px;
    font-family: var(--font-primary);
    font-size: 1rem;
    transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-secondary);
    box-shadow: 0 0 0 3px rgba(6, 182, 212, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.contact-form .btn {
    width: 100%;
    margin-top: var(--spacing-sm);
}

/* Form Message Styles */
#formMessage {
    display: none;
    padding: 1rem;
    border-radius: var(--border-radius);
    border-left: 4px solid;
    margin-bottom: 1.5rem;
    font-size: 0.95rem;
    line-height: 1.6;
    animation: slideDown 0.3s ease-out;
}

#formMessage.form-message-success,
#formMessage.form-message-error {
    display: block;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

#formMessage strong {
    display: block;
    margin-bottom: 0.5rem;
}

.form-message-success {
    background-color: #d4edda;
    color: #155724;
    border-left-color: #28a745;
}

.form-message-error {
    background-color: #f8d7da;
    color: #721c24;
    border-left-color: #f5c6cb;
}

#formMessage ul, #formMessage ol {
    margin: 0.5rem 0 0 1.5rem;
}

#formMessage li {
    margin-bottom: 0.25rem;
}

/* ============================================
   Footer
   ============================================ */
.footer {
    background-color: var(--color-bg-dark);
    color: white;
    padding: var(--spacing-lg) 0 var(--spacing-md);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.footer-section h4 {
    color: white;
    margin-bottom: var(--spacing-sm);
}

.footer-section p {
    color: rgba(255, 255, 255, 0.7);
}

.footer-links li {
    margin-bottom: 0.5rem;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--color-secondary);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.5);
    margin-bottom: 0;
}

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

.fade-in {
    animation: fadeInUp 0.8s ease;
}

/* ============================================
   Legal Pages (Impressum, Datenschutz)
   ============================================ */
.legal-content {
    max-width: 900px;
    margin: 0 auto;
}

.legal-section {
    margin-bottom: var(--spacing-lg);
}

.legal-section h2 {
    color: var(--color-primary);
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
}

.legal-section h3 {
    color: var(--color-text-dark);
    margin-top: var(--spacing-md);
    margin-bottom: var(--spacing-xs);
}

.legal-section h4 {
    color: var(--color-text);
    margin-top: var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
    font-size: 1rem;
}

.legal-section p {
    line-height: 1.8;
    margin-bottom: var(--spacing-sm);
}

.legal-section ul {
    margin-left: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
}

.legal-section li {
    list-style: disc;
    margin-bottom: 0.5rem;
    line-height: 1.6;
}

.legal-back {
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-lg);
    border-top: 2px solid var(--color-border);
    text-align: center;
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background-color: white;
        flex-direction: column;
        padding: var(--spacing-md);
        box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
        transform: translateX(-100%);
        transition: transform 0.3s ease;
    }

    .nav-menu.active {
        transform: translateX(0);
    }

    .nav-toggle {
        display: flex;
    }

    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }

    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }

    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -6px);
    }

    .hero-cta {
        flex-direction: column;
    }

    .hero-cta .btn {
        width: 100%;
    }

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

    .about-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .portrait-image {
        max-width: 280px;
        margin: 0 auto;
    }

    .section {
        padding: var(--spacing-lg) 0;
    }
}

@media (max-width: 480px) {
    :root {
        --spacing-md: 1.5rem;
        --spacing-lg: 3rem;
        --spacing-xl: 4rem;
    }

    .services-grid,
    .references-grid,
    .expertise-cards {
        grid-template-columns: 1fr;
    }

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

/* ============================================
   Isso Kommentare
   ============================================ */
.article-comments {
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
}

.article-comments h2 {
    font-family: var(--font-display);
    font-size: 1.75rem;
    color: var(--color-text-dark);
    margin-bottom: var(--spacing-md);
}