:root {
    --border-radius: 8px;
    --transition: 0.3s ease;
    --max-width: 1200px;
}

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

html {
    scroll-behavior: smooth;
}

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

/* Navigation */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: var(--nav-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transition: background-color var(--transition);
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
    transition: color var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-logo-img {
    height: 2rem;
    width: auto;
}

.logo-light {
    display: none;
}

.logo-dark {
    display: block;
}

[data-theme="light"] .logo-light {
    display: block;
}

[data-theme="light"] .logo-dark {
    display: none;
}

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

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

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.95rem;
    transition: color var(--transition);
}

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

.theme-toggle {
    background: none;
    border: none;
    font-size: 1.25rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: var(--border-radius);
    transition: background-color var(--transition);
    line-height: 1;
}

.theme-toggle:hover {
    background: var(--bg-secondary);
}

.nav-mobile-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.5rem;
    color: var(--text-primary);
    line-height: 1;
}

/* Hero Section */
#hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 2rem;
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #0f172a 100%);
    color: #f8fafc;
}

#hero h1 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 1rem;
    line-height: 1.2;
}

#hero p {
    font-size: 1.25rem;
    max-width: 600px;
    margin-bottom: 2rem;
    color: #94a3b8;
}

.btn-cta {
    display: inline-block;
    padding: 1rem 2rem;
    background: var(--accent-color);
    color: var(--btn-cta-text);
    text-decoration: none;
    border-radius: var(--border-radius);
    font-size: 1.1rem;
    font-weight: 600;
    transition: background-color var(--transition), transform var(--transition);
}

.btn-cta:hover {
    background: var(--accent-dark);
    transform: translateY(-2px);
}

/* Services Section */
#leistungen {
    padding: 5rem 2rem;
    max-width: var(--max-width);
    margin: 0 auto;
}

.section-header {
    text-align: center;
    margin-bottom: 3rem;
}

.section-header h2 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

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

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.service-card {
    background: var(--bg-card);
    box-shadow: var(--card-shadow);
    border-radius: var(--border-radius);
    padding: 2rem;
    transition: transform var(--transition), box-shadow var(--transition);
}

.service-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--card-shadow-hover);
}

.service-icon {
    font-size: 2.5rem;
    display: block;
    margin-bottom: 1rem;
}

.service-card h3 {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.service-card p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* About Section */
#ueber-uns {
    padding: 5rem 2rem;
    max-width: var(--max-width);
    margin: 0 auto;
}

.about-text {
    max-width: 720px;
    margin: 0 auto;
    text-align: center;
}

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

/* Contact Section */
#kontakt {
    padding: 5rem 2rem;
    max-width: var(--max-width);
    margin: 0 auto;
    text-align: center;
}

.contact-content {
    margin-top: 2rem;
}

.contact-email {
    margin-top: 1rem;
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.contact-phone {
    margin-top: 0.5rem;
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.contact-phone a {
    color: var(--accent-color);
    text-decoration: none;
    transition: color var(--transition);
}

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

/* Technology Section */
#technologien {
    padding: 5rem 2rem;
    max-width: var(--max-width);
    margin: 0 auto;
}

.tech-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1rem;
}

.tech-item {
    background: var(--bg-card);
    box-shadow: var(--card-shadow);
    border-radius: var(--border-radius);
    padding: 0.75rem 1.5rem;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-primary);
    transition: transform var(--transition), box-shadow var(--transition);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.tech-name {
    display: block;
}

.tech-desc {
    display: none;
    font-size: 0.85rem;
    font-weight: 400;
    color: var(--text-secondary);
    margin-top: 0.5rem;
    line-height: 1.5;
}

.tech-item.active .tech-desc {
    display: block;
}

.tech-item.active {
    outline: 2px solid var(--accent-color);
    outline-offset: 2px;
}

.tech-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--card-shadow-hover);
}

/* Process/Ablauf Section */
#ablauf {
    padding: 5rem 2rem;
    max-width: var(--max-width);
    margin: 0 auto;
}

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

.process-step {
    background: var(--bg-card);
    box-shadow: var(--card-shadow);
    border-radius: var(--border-radius);
    padding: 2rem;
    text-align: center;
    transition: transform var(--transition);
}

.process-step:hover {
    transform: translateY(-3px);
}

.process-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2.5rem;
    height: 2.5rem;
    background: var(--accent-color);
    color: #ffffff;
    border-radius: 50%;
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.process-step h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.process-step p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* CTA Bottom Section */
#cta-bottom {
    padding: 5rem 2rem;
    background: var(--bg-highlight);
    text-align: center;
}

.cta-bottom-content h2 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.cta-bottom-content p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

/* Skip Link (Accessibility) */
.skip-link {
    position: absolute;
    top: -100%;
    left: 0;
    background: var(--accent-color);
    color: #ffffff;
    padding: 0.75rem 1.5rem;
    z-index: 9999;
    text-decoration: none;
    font-weight: 600;
    border-radius: 0 0 var(--border-radius) 0;
    transition: top var(--transition);
}

.skip-link:focus {
    top: 0;
}


/* Legal Page (Impressum) */
.legal-page {
    padding-top: 5rem;
    min-height: 100vh;
}

.legal-content {
    max-width: 800px;
    margin: 0 auto;
    padding: 3rem 2rem;
}

.legal-content h1 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 2rem;
}

.legal-content h2 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-top: 2.5rem;
    margin-bottom: 1rem;
}

.legal-content h3 {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-top: 1.5rem;
    margin-bottom: 0.75rem;
}

.legal-content p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
    line-height: 1.7;
}

.legal-content ul {
    margin: 0.75rem 0 0.75rem 1.5rem;
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
}

.legal-content a {
    color: var(--accent-color);
    text-decoration: none;
    transition: color var(--transition);
}

.legal-content a:hover {
    color: var(--accent-dark);
}

/* Footer */
footer {
    background: var(--bg-secondary);
    padding: 2rem;
    text-align: center;
}

footer p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-top: 0.5rem;
}

footer a {
    font-size: 0.9rem;
    color: var(--accent-color);
    text-decoration: none;
    transition: color var(--transition);
}

footer a:hover {
    color: var(--accent-dark);
}

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

/* Responsive Design */
@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--nav-bg);
        backdrop-filter: blur(10px);
        -webkit-backdrop-filter: blur(10px);
        flex-direction: column;
        padding: 1rem 2rem;
        gap: 1rem;
    }

    .nav-links.nav-open {
        display: flex;
    }

    .nav-mobile-toggle {
        display: block;
    }

    .nav-container {
        padding: 0.75rem 1rem;
    }

    #hero h1 {
        font-size: 2rem;
    }

    #hero p {
        font-size: 1rem;
    }

    #hero {
        padding: 1.5rem;
    }

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

    .tech-grid {
        gap: 0.75rem;
    }

    .tech-item {
        padding: 0.5rem 1rem;
        font-size: 0.85rem;
    }

    #leistungen {
        padding: 3rem 1rem;
    }

    #ueber-uns {
        padding: 3rem 1rem;
    }

    #kontakt {
        padding: 3rem 1rem;
    }

    .section-header h2 {
        font-size: 1.6rem;
    }

    footer {
        padding: 1.5rem 1rem;
    }
}