/* ==========================================================================
   Responsive Styles - Institut für Bioenergetik/Bioresonanz
   Breakpoints: Tablet (≤921px), Mobile (≤544px)
   ========================================================================== */

/* Tablet Styles (≤921px)
   ========================================================================== */
@media (max-width: 921px) {
    
    /* Typography adjustments */
    h1 { font-size: 2.1rem; }
    h2 { font-size: 1.76rem; }
    h3 { font-size: 1.47rem; }
    h4 { font-size: 1.18rem; }
    
    /* Header / Navigation */
    .main-navigation {
        display: none;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    /* Hero Section */
    .hero-section {
        padding: var(--spacing-xl) 0;
    }
    
    .hero-title {
        font-size: 2.2rem;
    }
    
    .hero-description {
        font-size: 1.1rem;
    }
    
    /* Two Column Grid → Stack */
    .two-column-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    /* Benefits Grid */
    .benefits-grid {
        grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
        gap: var(--spacing-md);
    }
    
    /* Services Grid */
    .services-grid {
        grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    }
    
    /* Applications Grid */
    .applications-grid {
        grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    }
    
    /* About Section */
    .about-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .about-image {
        max-width: 400px;
        margin: 0 auto;
    }
    
    /* Testimonials Grid */
    .testimonials-grid {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    }
    
    /* Contact Grid */
    .contact-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    /* Footer */
    .footer-grid {
        flex-direction: column;
        gap: var(--spacing-md);
        text-align: center;
    }
    
    /* Spacing adjustments */
    section {
        padding: var(--spacing-lg) 0;
    }
    
    .hero-section,
    .cta-section {
        padding: var(--spacing-xl) 0;
    }
    
    /* Kontaktseite - Tablet */
    .contact-info-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .info-boxes {
        grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    }
}


/* Mobile Styles (≤544px)
   ========================================================================== */
@media (max-width: 544px) {
    
    /* Base font size adjustment */
    html {
        font-size: 100%; /* 16px base */
    }
    
    /* Typography */
    h1 { font-size: 1.88rem; }
    h2 { font-size: 1.53rem; }
    h3 { font-size: 1.29rem; }
    h4 { font-size: 1.06rem; }
    h5 { font-size: 0.88rem; }
    h6 { font-size: 0.76rem; }
    
    /* Container padding */
    .container {
        padding: 0 16px;
    }
    
    /* Header */
    .header-container {
        padding: 0 16px;
    }
    
    .site-logo {
        max-width: 120px;
    }
    
    /* Mobile Menu */
    .mobile-menu-overlay {
        width: 90%;
    }
    
    .mobile-navigation {
        padding: var(--spacing-md) var(--spacing-sm);
    }
    
    /* Hero Section */
    .hero-section {
        padding: var(--spacing-lg) 0;
    }
    
    .hero-container {
        padding: 0 16px;
    }
    
    .hero-subtitle {
        font-size: 0.85rem;
    }
    
    .hero-title {
        font-size: 1.8rem;
        margin-bottom: var(--spacing-sm);
    }
    
    .hero-description {
        font-size: 1rem;
        margin-bottom: var(--spacing-md);
    }
    
    /* Buttons */
    .btn {
        padding: 14px 24px;
        font-size: 0.9rem;
        width: 100%;
        max-width: 300px;
    }
    
    .btn-large {
        padding: 16px 30px;
        font-size: 0.95rem;
    }
    
    /* Problem/Solution boxes */
    .problem-box,
    .solution-box {
        padding: var(--spacing-md);
    }
    
    .check-list li {
        font-size: 0.95rem;
        padding-left: 1.5rem;
    }
    
    /* Benefits Grid */
    .benefits-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }
    
    .benefit-card {
        padding: var(--spacing-md);
    }
    
    .benefit-icon {
        font-size: 2.5rem;
        margin-bottom: var(--spacing-sm);
    }
    
    .benefit-card h3 {
        font-size: 1.2rem;
    }
    
    /* Services Grid */
    .services-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }
    
    .service-card {
        padding: var(--spacing-md);
    }
    
    .service-icon {
        width: 60px;
        height: 60px;
    }
    
    .service-icon svg {
        width: 35px;
        height: 35px;
    }
    
    /* Applications Grid */
    .applications-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }
    
    .application-box {
        padding: var(--spacing-sm);
    }
    
    .application-box h3 {
        font-size: 1.1rem;
    }
    
    /* About Section */
    .about-content {
        padding: 0 16px;
    }
    
    .about-intro {
        font-size: 1.1rem;
    }
    
    .qualification-item {
        flex-direction: row;
        gap: 0.8rem;
        padding: var(--spacing-xs);
        font-size: 0.95rem;
    }
    
    .qual-icon {
        font-size: 1.3rem;
    }
    
    .philosophy-quote {
        padding: var(--spacing-sm);
        margin: var(--spacing-md) 0;
    }
    
    .philosophy-quote p {
        font-size: 1rem;
    }
    
    .mission {
        padding: var(--spacing-sm);
        font-size: 0.95rem;
    }
    
    /* Testimonials */
    .testimonials-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }
    
    .testimonial-card {
        padding: var(--spacing-md);
    }
    
    .testimonial-text {
        font-size: 0.95rem;
    }
    
    /* CTA Section */
    .cta-section {
        padding: var(--spacing-lg) 0;
    }
    
    .cta-section h2 {
        font-size: 1.6rem;
        margin-bottom: var(--spacing-sm);
    }
    
    .cta-section p {
        font-size: 1rem;
        margin-bottom: var(--spacing-md);
    }
    
    /* Video Section */
    .video-wrapper {
        border-radius: var(--radius-md);
    }
    
    .video-placeholder p {
        font-size: 0.9rem;
        padding: 0 var(--spacing-sm);
    }
    
    /* Contact Section */
    .contact-item {
        flex-direction: row;
        align-items: flex-start;
        padding: var(--spacing-sm);
    }
    
    .contact-icon {
        width: 40px;
        height: 40px;
    }
    
    .contact-item h3 {
        font-size: 0.95rem;
    }
    
    .contact-item p {
        font-size: 0.9rem;
    }
    
    /* Disclaimer */
    .disclaimer-text {
        font-size: 0.85rem;
        padding: 0 16px;
    }
    
    /* Footer */
    .footer-container {
        padding: 0 16px;
    }
    
    .footer-column {
        text-align: center;
    }
    
    .footer-column p {
        font-size: 0.9rem;
    }
    
    .copyright {
        font-size: 0.85rem;
    }
    
    /* Back to Top Button */
    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 45px;
        height: 45px;
        font-size: 1.3rem;
    }
    
    /* Spacing adjustments */
    :root {
        --spacing-xs: 0.4rem;
        --spacing-sm: 0.8rem;
        --spacing-md: 1.5rem;
        --spacing-lg: 2rem;
        --spacing-xl: 3rem;
        --spacing-xxl: 4rem;
    }
    
    section {
        padding: var(--spacing-lg) 0;
    }
    
    .section-title {
        margin-bottom: var(--spacing-md);
        font-size: 1.6rem;
    }
    
    /* Kontaktseite - Mobile */
    .page-header {
        padding: var(--spacing-md) 0;
    }
    
    .contact-item-detailed {
        flex-direction: row;
        align-items: flex-start;
        gap: var(--spacing-sm);
    }
    
    .contact-icon-large {
        width: 45px;
        height: 45px;
    }
    
    .contact-details h3 {
        font-size: 0.95rem;
    }
    
    .contact-details p {
        font-size: 0.9rem;
    }
    
    .info-boxes {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }
    
    .info-box {
        padding: var(--spacing-md);
    }
    
    .map-description {
        padding: var(--spacing-sm);
    }
    
    .cta-buttons {
        flex-direction: column;
        align-items: stretch;
    }
    
    .cta-buttons .btn {
        width: 100%;
    }
}


/* Landscape Mobile (480px - 767px)
   ========================================================================== */
@media (min-width: 480px) and (max-width: 767px) {
    
    /* Benefits Grid - 2 columns on landscape */
    .benefits-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    /* Applications Grid - 2 columns */
    .applications-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    /* Testimonials - 2 columns */
    .testimonials-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}


/* Small Tablets (768px - 921px)
   ========================================================================== */
@media (min-width: 768px) and (max-width: 921px) {
    
    /* Benefits Grid - 2 columns */
    .benefits-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    /* Services Grid - 2 columns */
    .services-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    /* Applications Grid - 3 columns */
    .applications-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    /* Testimonials - 2 columns */
    .testimonials-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}


/* Print Styles
   ========================================================================== */
@media print {
    .site-header,
    .mobile-menu-overlay,
    .mobile-menu-toggle,
    .back-to-top,
    .cta-section,
    .site-footer {
        display: none;
    }
    
    body {
        font-size: 12pt;
        line-height: 1.5;
    }
    
    h1 { font-size: 24pt; }
    h2 { font-size: 20pt; }
    h3 { font-size: 16pt; }
    
    a {
        text-decoration: underline;
        color: #000;
    }
    
    a[href^="http"]:after {
        content: " (" attr(href) ")";
        font-size: 10pt;
    }
}