/* ========================================
   CSS Variables & Root Styles
   ======================================== */
:root {
    /* Farben */
    --primary-yellow: #FFD700;
    --primary-blue: #1E3A8A;
    --secondary-blue: #2563EB;
    --light-yellow: #FFF9E6;
    --dark-blue: #0F172A;
    --white: #FFFFFF;
    --light-gray: #F8F9FA;
    --gray: #6B7280;
    --dark-gray: #374151;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #FFD700 0%, #FFC107 100%);
    --gradient-blue: linear-gradient(135deg, #1E3A8A 0%, #2563EB 100%);
    --gradient-hero: linear-gradient(135deg, rgba(30, 58, 138, 0.95) 0%, rgba(37, 99, 235, 0.9) 100%);
    --gradient-overlay: linear-gradient(180deg, rgba(0, 0, 0, 0.3) 0%, rgba(0, 0, 0, 0.6) 100%);
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
    
    /* Typography */
    --font-primary: 'Montserrat', sans-serif;
    --font-secondary: 'Open Sans', sans-serif;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.15);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.2);
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;
    --radius-xl: 24px;
}

/* ========================================
   Global Styles
   ======================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: var(--font-secondary);
    color: var(--dark-gray);
    line-height: 1.6;
    overflow-x: hidden;
    background-color: var(--white);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* ========================================
   Navigation
   ======================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--white);
    box-shadow: var(--shadow-md);
    z-index: 1000;
    transition: var(--transition-normal);
}

.navbar.scrolled {
    box-shadow: var(--shadow-lg);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-family: var(--font-primary);
    color: var(--primary-blue);
}

.logo i {
    font-size: 2rem;
    color: var(--primary-yellow);
}

.logo span {
    font-size: 0.9rem;
    line-height: 1.2;
}

.logo strong {
    font-weight: 700;
    font-size: 1.1rem;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
}

.nav-menu a {
    text-decoration: none;
    color: var(--dark-gray);
    font-weight: 500;
    font-family: var(--font-primary);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    transition: var(--transition-fast);
}

.nav-menu a:hover {
    color: var(--primary-blue);
    background: var(--light-yellow);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
}

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

/* ========================================
   Hero Section
   ======================================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    margin-top: 80px;
    background: var(--gradient-blue);
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 50%, rgba(255, 215, 0, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(255, 215, 0, 0.1) 0%, transparent 50%);
    animation: heroBackground 20s ease infinite;
}

@keyframes heroBackground {
    0%, 100% { opacity: 0.5; }
    50% { opacity: 0.8; }
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--gradient-overlay);
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    color: var(--white);
    padding: var(--spacing-xl) 0;
}

.hero-title {
    font-family: var(--font-primary);
    font-size: 4rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: var(--spacing-md);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.title-line {
    display: block;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-lg);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
    opacity: 0.95;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    flex-wrap: wrap;
}

.hero-stats {
    display: flex;
    gap: var(--spacing-lg);
    justify-content: center;
    margin-top: var(--spacing-xl);
    flex-wrap: wrap;
}

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

.stat-number {
    font-size: 3rem;
    font-weight: 800;
    font-family: var(--font-primary);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    opacity: 0.9;
}

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

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

/* ========================================
   Buttons
   ======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    border-radius: var(--radius-md);
    font-family: var(--font-primary);
    font-weight: 600;
    font-size: 1rem;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.btn span {
    position: relative;
    z-index: 1;
}

.btn i {
    position: relative;
    z-index: 1;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--dark-blue);
    box-shadow: var(--shadow-md);
}

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

.btn-secondary {
    background: transparent;
    color: var(--white);
    border: 2px solid var(--white);
}

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

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.1rem;
}

/* ========================================
   Sections
   ======================================== */
.section {
    padding: var(--spacing-xl) 0;
    position: relative;
}

.section:nth-child(even) {
    background: var(--light-gray);
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.section-label {
    display: inline-block;
    font-size: 0.9rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--primary-blue);
    margin-bottom: var(--spacing-sm);
    background: var(--light-yellow);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-xl);
}

.section-title {
    font-family: var(--font-primary);
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--dark-blue);
    margin-bottom: var(--spacing-sm);
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background: var(--gradient-primary);
    margin: var(--spacing-sm) auto 0;
    border-radius: 2px;
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--gray);
    max-width: 700px;
    margin: 0 auto;
}

/* ========================================
   Über Uns Section
   ======================================== */
.ueber-uns-content {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: var(--spacing-lg);
    align-items: center;
}

.ueber-uns-text .lead {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--primary-blue);
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
}

.ueber-uns-text p {
    margin-bottom: var(--spacing-sm);
    color: var(--dark-gray);
}

.ueber-uns-features {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

.feature-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm);
    background: var(--white);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    transition: var(--transition-normal);
}

.feature-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.feature-item i {
    font-size: 1.5rem;
    color: var(--primary-yellow);
}

.feature-item span {
    font-weight: 600;
    color: var(--primary-blue);
}

.ueber-uns-image {
    position: relative;
}

.image-card {
    background: var(--gradient-blue);
    padding: var(--spacing-lg);
    border-radius: var(--radius-xl);
    text-align: center;
    color: var(--white);
    box-shadow: var(--shadow-xl);
    position: relative;
    overflow: hidden;
}

.image-card::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255, 215, 0, 0.1) 0%, transparent 70%);
    animation: rotate 20s linear infinite;
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.image-card i {
    font-size: 5rem;
    margin-bottom: var(--spacing-md);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    position: relative;
}

.image-card h3 {
    font-size: 2rem;
    margin-bottom: var(--spacing-xs);
    position: relative;
}

.image-card p {
    font-size: 1.1rem;
    opacity: 0.9;
    position: relative;
}

/* ========================================
   Leistungen Section
   ======================================== */
.leistungen-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-md);
}

.service-card {
    background: var(--white);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transform-origin: left;
    transition: var(--transition-normal);
}

.service-card:hover::before {
    transform: scaleX(1);
}

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

.service-icon {
    width: 70px;
    height: 70px;
    background: var(--gradient-blue);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-sm);
    transition: var(--transition-normal);
}

.service-card:hover .service-icon {
    transform: scale(1.1) rotate(5deg);
}

.service-icon i {
    font-size: 2rem;
    color: var(--white);
}

.service-card h3 {
    font-family: var(--font-primary);
    font-size: 1.5rem;
    color: var(--dark-blue);
    margin-bottom: var(--spacing-sm);
}

.service-card p {
    color: var(--gray);
    margin-bottom: var(--spacing-sm);
    line-height: 1.6;
}

.service-list {
    list-style: none;
    margin-top: var(--spacing-sm);
}

.service-list li {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) 0;
    color: var(--dark-gray);
}

.service-list i {
    color: var(--primary-yellow);
    font-size: 0.9rem;
}

.service-card-special {
    background: var(--gradient-blue);
    color: var(--white);
}

.service-card-special h3 {
    color: var(--white);
}

.service-card-special p {
    color: rgba(255, 255, 255, 0.9);
}

.service-card-special .service-icon {
    background: var(--gradient-primary);
}

.service-card-special .service-icon i {
    color: var(--dark-blue);
}

.service-link {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--primary-yellow);
    font-weight: 600;
    text-decoration: none;
    margin-top: var(--spacing-sm);
    transition: var(--transition-fast);
}

.service-link:hover {
    gap: var(--spacing-sm);
}

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

.referenz-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: var(--transition-normal);
}

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

.referenz-image {
    height: 200px;
    background: var(--gradient-blue);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.referenz-image::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 30% 50%, rgba(255, 215, 0, 0.2) 0%, transparent 70%);
}

.referenz-image i {
    font-size: 4rem;
    color: var(--white);
    opacity: 0.9;
    position: relative;
    z-index: 1;
}

.referenz-content {
    padding: var(--spacing-md);
}

.referenz-content h3 {
    font-family: var(--font-primary);
    font-size: 1.3rem;
    color: var(--dark-blue);
    margin-bottom: var(--spacing-xs);
}

.referenz-content p {
    color: var(--gray);
    margin-bottom: var(--spacing-sm);
}

.referenz-tag {
    display: inline-block;
    font-size: 0.85rem;
    padding: 4px 12px;
    background: var(--light-yellow);
    color: var(--primary-blue);
    border-radius: var(--radius-xl);
    font-weight: 600;
}

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

.bewertung-card {
    background: var(--white);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: var(--transition-normal);
    position: relative;
}

.bewertung-card::before {
    content: '"';
    position: absolute;
    top: -20px;
    left: 20px;
    font-size: 100px;
    color: var(--light-yellow);
    font-family: Georgia, serif;
    line-height: 1;
}

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

.bewertung-stars {
    display: flex;
    gap: 4px;
    margin-bottom: var(--spacing-sm);
}

.bewertung-stars i {
    color: var(--primary-yellow);
    font-size: 1.2rem;
}

.bewertung-text {
    color: var(--dark-gray);
    line-height: 1.7;
    margin-bottom: var(--spacing-md);
    position: relative;
    z-index: 1;
}

.bewertung-author {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.author-avatar {
    width: 50px;
    height: 50px;
    background: var(--gradient-blue);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-weight: 700;
    font-family: var(--font-primary);
}

.author-info h4 {
    font-family: var(--font-primary);
    color: var(--dark-blue);
    margin-bottom: 2px;
}

.author-info span {
    font-size: 0.9rem;
    color: var(--gray);
}

.bewertung-summary {
    text-align: center;
    padding: var(--spacing-lg);
    background: var(--gradient-blue);
    border-radius: var(--radius-xl);
    color: var(--white);
}

.summary-number {
    font-size: 4rem;
    font-weight: 800;
    font-family: var(--font-primary);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
    margin-bottom: var(--spacing-xs);
}

.summary-stars {
    display: flex;
    gap: 8px;
    justify-content: center;
    margin-bottom: var(--spacing-xs);
}

.summary-stars i {
    color: var(--primary-yellow);
    font-size: 1.5rem;
}

.summary-label {
    font-size: 1.1rem;
    opacity: 0.9;
}

/* ========================================
   Kontakt Section
   ======================================== */
.kontakt-content {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: var(--spacing-lg);
}

.kontakt-info {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.info-card {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: var(--transition-normal);
}

.info-card:hover {
    transform: translateX(10px);
    box-shadow: var(--shadow-md);
}

.info-icon {
    width: 50px;
    height: 50px;
    background: var(--gradient-primary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.info-icon i {
    font-size: 1.5rem;
    color: var(--dark-blue);
}

.info-content h3 {
    font-family: var(--font-primary);
    font-size: 1.1rem;
    color: var(--dark-blue);
    margin-bottom: 4px;
}

.info-content p {
    color: var(--gray);
    line-height: 1.6;
}

.info-content a {
    color: var(--primary-blue);
    text-decoration: none;
    transition: var(--transition-fast);
}

.info-content a:hover {
    color: var(--secondary-blue);
}

.info-card-special {
    background: var(--light-yellow);
    border: 2px solid var(--primary-yellow);
}

.kontakt-form {
    background: var(--white);
    padding: var(--spacing-lg);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
}

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

.form-group label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 600;
    color: var(--dark-blue);
    font-family: var(--font-primary);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: var(--spacing-sm);
    border: 2px solid #E5E7EB;
    border-radius: var(--radius-md);
    font-family: var(--font-secondary);
    font-size: 1rem;
    transition: var(--transition-fast);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 3px rgba(30, 58, 138, 0.1);
}

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

.checkbox-label {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-xs);
    cursor: pointer;
}

.checkbox-label input[type="checkbox"] {
    width: auto;
    margin-top: 4px;
    cursor: pointer;
}

.checkbox-label span {
    font-weight: normal;
    color: var(--dark-gray);
}

.form-message {
    margin-top: var(--spacing-md);
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    display: none;
}

.form-message.success {
    display: block;
    background: #D1FAE5;
    color: #065F46;
    border: 2px solid #10B981;
}

.form-message.error {
    display: block;
    background: #FEE2E2;
    color: #991B1B;
    border: 2px solid #EF4444;
}

/* ========================================
   Map Section
   ======================================== */
.map-section {
    padding: 0;
}

.map-container {
    width: 100%;
    height: 450px;
    position: relative;
}

.map-container iframe {
    width: 100%;
    height: 100%;
    filter: grayscale(20%);
}

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

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

.footer-column h3 {
    font-family: var(--font-primary);
    margin-bottom: var(--spacing-sm);
    color: var(--primary-yellow);
}

.footer-column ul {
    list-style: none;
}

.footer-column ul li {
    margin-bottom: var(--spacing-xs);
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-xs);
    opacity: 0.9;
}

.footer-column ul li i {
    color: var(--primary-yellow);
    margin-top: 4px;
}

.footer-column a {
    color: var(--white);
    text-decoration: none;
    transition: var(--transition-fast);
}

.footer-column a:hover {
    color: var(--primary-yellow);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-sm);
}

.footer-logo i {
    font-size: 2rem;
    color: var(--primary-yellow);
}

.footer-logo span {
    font-size: 0.9rem;
    line-height: 1.2;
}

.footer-logo strong {
    font-weight: 700;
    font-size: 1.1rem;
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.footer-links {
    display: flex;
    gap: var(--spacing-md);
}

.footer-links a {
    color: var(--white);
    text-decoration: none;
    opacity: 0.8;
    transition: var(--transition-fast);
}

.footer-links a:hover {
    opacity: 1;
    color: var(--primary-yellow);
}

/* ========================================
   Back to Top Button
   ======================================== */
.back-to-top {
    position: fixed;
    bottom: var(--spacing-md);
    right: var(--spacing-md);
    width: 50px;
    height: 50px;
    background: var(--gradient-blue);
    color: var(--white);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-normal);
    z-index: 999;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

/* ========================================
   Animations
   ======================================== */
.fade-in {
    opacity: 0;
    animation: fadeIn 1s ease forwards;
}

.fade-in-delay-1 {
    opacity: 0;
    animation: fadeIn 1s ease 0.3s forwards;
}

.fade-in-delay-2 {
    opacity: 0;
    animation: fadeIn 1s ease 0.6s forwards;
}

.fade-in-delay-3 {
    opacity: 0;
    animation: fadeIn 1s ease 0.9s forwards;
}

@keyframes fadeIn {
    to {
        opacity: 1;
    }
}

.slide-in-left {
    opacity: 0;
    transform: translateX(-50px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.slide-in-right {
    opacity: 0;
    transform: translateX(50px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.slide-in-up {
    opacity: 0;
    transform: translateY(50px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.slide-in-left.visible,
.slide-in-right.visible,
.slide-in-up.visible {
    opacity: 1;
    transform: translate(0, 0);
}

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 1024px) {
    .hero-title {
        font-size: 3rem;
    }
    
    .ueber-uns-content {
        grid-template-columns: 1fr;
    }
    
    .kontakt-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: var(--white);
        flex-direction: column;
        padding: var(--spacing-md);
        box-shadow: var(--shadow-lg);
        transition: var(--transition-normal);
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .hero {
        margin-top: 70px;
        padding: var(--spacing-lg) 0;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: stretch;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .leistungen-grid {
        grid-template-columns: 1fr;
    }
    
    .referenzen-grid {
        grid-template-columns: 1fr;
    }
    
    .bewertungen-grid {
        grid-template-columns: 1fr;
    }
    
    .ueber-uns-features {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
    
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    :root {
        --spacing-xl: 3rem;
        --spacing-lg: 2rem;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .stat-number {
        font-size: 2.5rem;
    }
    
    .section-title {
        font-size: 1.75rem;
    }
    
    .hero-stats {
        gap: var(--spacing-md);
    }
}