/* USN France Questionnaire Styles */

:root {
    /* USN Brand Colors - Based on official USN logo */
    --usn-primary: #004080;      /* USN Blue - exact match to logo */
    --usn-secondary: #0066cc;    /* Lighter USN blue */
    --usn-accent: #ff4081;       /* Pink accent */
    --usn-success: #4caf50;      /* Green */
    --usn-warning: #ff9800;      /* Orange */
    --usn-dark: #212121;         /* Dark gray */
    --usn-light: #f5f5f5;        /* Light gray */
    --usn-white: #ffffff;
    
    /* Typography */
    --font-primary: 'Inter', sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* Border radius */
    --radius-sm: 0.5rem;
    --radius-md: 1rem;
    --radius-lg: 1.5rem;
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.15);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.2);
}

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

/* Enhanced image loading for transparent backgrounds */
img {
    image-rendering: -webkit-optimize-contrast;
    image-rendering: crisp-edges;
}

/* 🎮 GAMIFICATION STYLES */
@keyframes particle-explosion {
    0% {
        transform: translate(0, 0) scale(1);
        opacity: 1;
    }
    100% {
        transform: translate(var(--end-x), var(--end-y)) scale(0);
        opacity: 0;
    }
}

@keyframes feedback-popup {
    0% {
        transform: translateX(-50%) translateY(20px) scale(0.8);
        opacity: 0;
    }
    50% {
        transform: translateX(-50%) translateY(-10px) scale(1.1);
        opacity: 1;
    }
    100% {
        transform: translateX(-50%) translateY(-20px) scale(1);
        opacity: 0;
    }
}

@keyframes motivational-bounce {
    0% {
        transform: translateX(-50%) translateY(-50%) scale(0.3);
        opacity: 0;
    }
    50% {
        transform: translateX(-50%) translateY(-50%) scale(1.1);
        opacity: 1;
    }
    70% {
        transform: translateX(-50%) translateY(-50%) scale(0.95);
    }
    100% {
        transform: translateX(-50%) translateY(-50%) scale(1);
        opacity: 0;
    }
}

@keyframes completion-celebration {
    0% {
        transform: translateX(-50%) translateY(-50%) scale(0.5) rotate(-10deg);
        opacity: 0;
    }
    50% {
        transform: translateX(-50%) translateY(-50%) scale(1.1) rotate(5deg);
        opacity: 1;
    }
    100% {
        transform: translateX(-50%) translateY(-50%) scale(1) rotate(0deg);
        opacity: 0;
    }
}

@keyframes confetti-fall {
    0% {
        transform: translateY(-10px) rotate(0deg);
        opacity: 1;
    }
    100% {
        transform: translateY(100vh) rotate(360deg);
        opacity: 0;
    }
}

@keyframes progress-glow {
    0%, 100% {
        box-shadow: 0 0 5px rgba(76, 175, 80, 0.3);
    }
    50% {
        box-shadow: 0 0 20px rgba(76, 175, 80, 0.8);
        transform: scaleY(1.2);
    }
}

@keyframes sparkle {
    0% { transform: scale(1) rotate(0deg); }
    100% { transform: scale(1.2) rotate(15deg); }
}

@keyframes trophy-bounce {
    0% { transform: translateY(0px) scale(1); }
    100% { transform: translateY(-5px) scale(1.1); }
}

@keyframes subtle-pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.8; }
}

@keyframes loading-fade-in {
    0% { opacity: 0; }
    100% { opacity: 1; }
}

@keyframes loading-fade-out {
    0% { opacity: 1; }
    100% { opacity: 0; }
}

@keyframes product-success-pop {
    0% { transform: scale(0) rotate(0deg); opacity: 0; }
    50% { transform: scale(1.2) rotate(180deg); opacity: 1; }
    100% { transform: scale(1) rotate(360deg); opacity: 0; }
}

@keyframes final-success-slide {
    0% { 
        transform: translateX(100%); 
        opacity: 0; 
    }
    20% { 
        transform: translateX(0); 
        opacity: 1; 
    }
    80% { 
        transform: translateX(0); 
        opacity: 1; 
    }
    100% { 
        transform: translateX(100%); 
        opacity: 0; 
    }
}

@keyframes restart-bounce {
    0% { 
        transform: translateX(-50%) translateY(-50%) scale(0.3) rotate(-180deg); 
        opacity: 0; 
    }
    60% { 
        transform: translateX(-50%) translateY(-50%) scale(1.1) rotate(10deg); 
        opacity: 1; 
    }
    80% { 
        transform: translateX(-50%) translateY(-50%) scale(0.95) rotate(-5deg); 
        opacity: 1; 
    }
    100% { 
        transform: translateX(-50%) translateY(-50%) scale(1) rotate(0deg); 
        opacity: 0; 
    }
}

.restart-icon {
    font-size: 2rem;
    margin-bottom: 0.5rem;
    display: inline-block;
    animation: spin 1s ease-in-out;
}

/* Loading animation styles */
.loading-container {
    text-align: center;
    color: white;
}

.loading-spinner {
    width: 60px;
    height: 60px;
    border: 4px solid rgba(255,255,255,0.3);
    border-top: 4px solid #4caf50;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 2rem auto;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.loading-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    color: #fff;
}

.loading-steps {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
    align-items: flex-start;
    text-align: left;
}

.loading-step {
    padding: 0.5rem 1rem;
    border-radius: 25px;
    background: rgba(255,255,255,0.1);
    opacity: 0.5;
    transform: translateX(-20px);
    transition: all 0.3s ease;
    font-weight: 500;
}

.loading-step.active {
    opacity: 1;
    transform: translateX(0);
    background: rgba(76, 175, 80, 0.3);
    box-shadow: 0 0 15px rgba(76, 175, 80, 0.5);
}

.loading-step.completed {
    opacity: 0.8;
    background: rgba(76, 175, 80, 0.2);
    transform: translateX(10px);
}

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

.success-title {
    font-weight: 700;
    font-size: 1.1rem;
}

.success-subtitle {
    font-size: 0.9rem;
    opacity: 0.9;
}

.selected-glow {
    box-shadow: 0 0 20px rgba(76, 175, 80, 0.6) !important;
    border: 2px solid #4caf50 !important;
}

.fade-out {
    transition: all 0.5s ease !important;
}

.progress-celebration {
    animation: progress-glow 1s ease-in-out;
}

.feedback-icon {
    display: inline-block;
    margin-right: 0.5rem;
    animation: sparkle 0.8s ease-in-out infinite alternate;
}

.badge-icon {
    font-size: 3rem;
    margin-bottom: 0.5rem;
    animation: trophy-bounce 0.8s ease-in-out infinite alternate;
}

.badge-text {
    font-size: 1.4rem;
    font-weight: 800;
    margin-bottom: 0.3rem;
}

.badge-subtext {
    font-size: 0.9rem;
    opacity: 0.8;
    font-weight: 500;
}

/* Navigation Styles */
.top-nav {
    background: var(--usn-primary);
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1400px;
    margin: 0 auto;
    padding: 1rem 2rem;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 12px;
}

.nav-brand .logo {
    height: 35px;
    width: auto;
}

.nav-brand .brand-text {
    color: white;
    font-size: 1.3rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.nav-links {
    display: flex;
    gap: 20px;
}

.nav-link {
    color: rgba(255, 255, 255, 0.9);
    text-decoration: none;
    padding: 10px 16px;
    border-radius: 8px;
    font-weight: 500;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-link:hover,
.nav-link.active {
    background: rgba(255, 255, 255, 0.2);
    color: white;
    backdrop-filter: blur(10px);
}

@media (max-width: 768px) {
    .nav-container {
        flex-direction: column;
        gap: 15px;
        padding: 1rem;
    }
    
    .nav-links {
        width: 100%;
        justify-content: center;
    }
}

body {
    font-family: var(--font-primary);
    line-height: 1.6;
    color: var(--usn-dark);
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 0;
    margin: 0;
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    -khtml-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    overscroll-behavior: auto; /* allow scroll */
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    background: var(--usn-white);
    border-radius: 0;
    box-shadow: none;
    overflow-y: auto; /* allow vertical scrolling */
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Hide scrollbars but keep scrolling */
body, .container {
    scrollbar-width: none; /* Firefox */
    -ms-overflow-style: none; /* IE 10+ */
}

body::-webkit-scrollbar,
.container::-webkit-scrollbar {
    display: none; /* Chrome, Safari, Edge */
}


/* Header Styles */
.header {
    background: var(--usn-primary);
    color: var(--usn-white);
    padding: env(safe-area-inset-top, 1rem) var(--spacing-md) var(--spacing-lg) var(--spacing-md);
    text-align: center;
    position: relative;
    flex-shrink: 0;
}

.header::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--usn-accent) 0%, var(--usn-success) 100%);
}



.logo-section {
    margin-bottom: var(--spacing-sm);
    display: flex;
    justify-content: center;
    align-items: center;
}

.usn-logo {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
}

.logo-image {
    height: 120px;
    width: auto;
    max-width: 350px;
    object-fit: contain;
    filter: brightness(0) invert(1) drop-shadow(0 2px 4px rgba(0,0,0,0.2));
    margin-top: 1rem;
    margin-bottom: 0.25rem;
}

.question-logo {
    display: inline-flex;
    align-items: center;
    margin-right: var(--spacing-md);
    flex-shrink: 0;
    padding: var(--spacing-xs);
}

.logo-image-small {
    height: 100px;
    width: auto;
    max-width: 300px;
    object-fit: contain;
    opacity: 0.95;
    filter: drop-shadow(0 2px 4px rgba(0,0,0,0.15));
}

.tagline {
    font-size: 0.9rem;
    font-weight: 400;
    letter-spacing: 0.05em;
    opacity: 0.95;
    display: block;
    margin-top: -0.2rem;
    text-shadow: 0 1px 2px rgba(0,0,0,0.2);
}

.main-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    text-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

.subtitle {
    font-size: 1.1rem;
    font-weight: 400;
    opacity: 0.95;
    margin-bottom: var(--spacing-sm);
    text-shadow: 0 1px 2px rgba(0,0,0,0.2);
}

.mobile-intro {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    font-size: 0.9rem;
    opacity: 0.9;
    font-weight: 400;
    text-shadow: 0 1px 2px rgba(0,0,0,0.2);
}

.mobile-intro i {
    font-size: 1.2rem;
}

/* Progress Bar */
.progress-container {
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--usn-light);
    border-bottom: 1px solid #e0e0e0;
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: #e0e0e0;
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: var(--spacing-sm);
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--usn-secondary) 0%, var(--usn-accent) 100%);
    border-radius: 4px;
    transition: width 0.3s ease;
    width: 33.33%;
}

.progress-text {
    text-align: center;
    font-weight: 600;
    color: var(--usn-dark);
}

/* Questionnaire Container */
.questionnaire-container {
    flex: 1;
    padding: var(--spacing-lg) var(--spacing-md);
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.question-slide {
    display: none;
    animation: fadeIn 0.5s ease-in-out;
}

.question-slide.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Question Header */
.question-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.question-title {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--usn-primary);
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.question-title i {
    color: var(--usn-accent);
    font-size: 1.8rem;
    flex-shrink: 0;
}

.question-subtitle {
    font-size: 1rem;
    color: #666;
    font-weight: 400;
    animation: subtle-pulse 3s ease-in-out infinite;
}

/* Options Grid */
.options-grid {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

.option-card {
    background: var(--usn-white);
    border: 2px solid #e0e0e0;
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    text-align: left;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    min-height: 70px;
    touch-action: manipulation;
}

.option-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.4), transparent);
    transition: left 0.5s ease;
}

.option-card:hover {
    border-color: var(--usn-secondary);
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 12px 25px rgba(0, 64, 128, 0.25);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.option-card:active {
    transform: translateY(-4px) scale(0.98);
    transition: all 0.1s ease;
}

.option-card:hover::before {
    left: 100%;
}

.option-card.selected {
    border-color: var(--usn-accent);
    background: linear-gradient(135deg, var(--usn-primary), var(--usn-secondary));
    color: var(--usn-white);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.option-icon {
    font-size: 1.8rem;
    color: var(--usn-secondary);
    transition: color 0.3s ease;
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.option-content {
    flex: 1;
}

.option-content h3 {
    margin: 0 0 0.2rem 0;
    font-size: 1.1rem;
    font-weight: 600;
}

.option-content p {
    margin: 0;
    font-size: 0.85rem;
    opacity: 0.7;
    line-height: 1.3;
}

.option-card.selected .option-icon {
    color: var(--usn-white);
}

.option-card.selected .option-content h3,
.option-card.selected .option-content p {
    color: var(--usn-white);
}

.option-card.selected .option-content p {
    opacity: 0.9;
}

/* Results Section */
.results-container {
    text-align: center;
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin: var(--spacing-xl) 0;
}

.product-card {
    background: var(--usn-white);
    border: 2px solid var(--usn-light);
    border-radius: var(--radius-md);
    padding: 0;
    text-align: left;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    backdrop-filter: blur(10px);
}

.product-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--usn-accent) 0%, var(--usn-success) 100%);
    z-index: 1;
}

.product-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--usn-secondary);
}

.product-image {
    width: 100%;
    height: 280px;
    overflow: hidden;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm);
    position: relative;
}

.product-image::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at center, rgba(255,255,255,0.3) 0%, transparent 70%);
    pointer-events: none;
    z-index: 1;
}

.product-image img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    transition: transform 0.3s ease, filter 0.3s ease;
    filter: drop-shadow(0 4px 8px rgba(0,0,0,0.1));
    border-radius: var(--radius-sm);
    position: relative;
    z-index: 2;
}

.product-card:hover .product-image img {
    transform: scale(1.05);
    filter: drop-shadow(0 6px 12px rgba(0,0,0,0.15));
}

.product-content {
    padding: var(--spacing-md);
    flex: 1;
    display: flex;
    flex-direction: column;
}

.product-category {
    font-size: 0.8rem;
    color: var(--usn-secondary);
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.product-badge {
    display: inline-block;
    background: var(--usn-accent);
    color: var(--usn-white);
    padding: 0.2rem 0.6rem;
    border-radius: 12px;
    font-size: 0.7rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    width: fit-content;
}

.product-card h3 {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--usn-primary);
    margin-bottom: var(--spacing-xs);
    line-height: 1.3;
}

.product-description {
    color: #666;
    margin-bottom: var(--spacing-sm);
    line-height: 1.4;
    font-size: 0.9rem;
    flex: 1;
}

.product-benefits {
    list-style: none;
    margin-bottom: var(--spacing-sm);
    padding: 0;
}

.product-benefits li {
    padding: 0.2rem 0;
    color: #555;
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-xs);
    font-size: 0.85rem;
    line-height: 1.3;
}

.product-benefits li::before {
    content: '✓';
    color: var(--usn-success);
    font-weight: bold;
    font-size: 0.9rem;
    margin-top: 0.1rem;
    flex-shrink: 0;
}

.product-usage {
    background: var(--usn-light);
    padding: var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    color: #555;
    border-left: 3px solid var(--usn-secondary);
    line-height: 1.3;
    margin-top: auto;
}

/* Navigation Buttons */
.navigation-buttons {
    display: flex;
    justify-content: space-between;
    padding: var(--spacing-lg);
    background: var(--usn-light);
    border-top: 1px solid #e0e0e0;
}

.nav-btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    border: none;
    border-radius: var(--radius-sm);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-family: inherit;
}

.btn-back {
    background: #e0e0e0;
    color: #666;
}

.btn-back:not(:disabled):hover {
    background: #d0d0d0;
    color: var(--usn-dark);
}

.btn-back:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-next {
    background: var(--usn-secondary);
    color: var(--usn-white);
}

.btn-next:hover {
    background: var(--usn-primary);
    transform: translateY(-2px);
}

/* Results Actions */
.results-actions {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
    margin-top: var(--spacing-xl);
}

.btn-primary, .btn-secondary {
    padding: var(--spacing-sm) var(--spacing-lg);
    border: none;
    border-radius: var(--radius-sm);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-family: inherit;
}

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

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

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

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

/* Footer */
.footer {
    background: var(--usn-dark);
    color: var(--usn-white);
    text-align: center;
    padding: var(--spacing-lg);
}

.footer-logo {
    margin-bottom: var(--spacing-sm);
}

.logo-image-footer {
    height: 80px;
    width: auto;
    max-width: 250px;
    object-fit: contain;
    filter: brightness(0) invert(1) drop-shadow(0 1px 2px rgba(255,255,255,0.1));
    opacity: 0.9;
}

.footer-subtitle {
    font-size: 0.9rem;
    opacity: 0.7;
    margin-top: var(--spacing-xs);
}

/* Mobile-First Design - Default styles are mobile */
.progress-container {
    padding: var(--spacing-md);
    background: var(--usn-light);
    border-bottom: 1px solid #e0e0e0;
}

.navigation-buttons {
    padding: env(safe-area-inset-bottom, var(--spacing-md)) var(--spacing-md) var(--spacing-md) var(--spacing-md);
    background: var(--usn-light);
    border-top: 1px solid #e0e0e0;
    flex-shrink: 0;
}

.products-grid {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin: var(--spacing-lg) 0;
}

.product-image {
    height: 280px;
}

.product-card {
    margin-bottom: 0;
    border-radius: var(--radius-sm);
}

.results-actions {
    flex-direction: column;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-lg);
}

.btn-primary, .btn-secondary {
    width: 100%;
    justify-content: center;
    padding: var(--spacing-md);
    font-size: 1rem;
    border-radius: var(--radius-sm);
}

/* Mobile responsive adjustments for question headers */
@media (max-width: 480px) {
    .question-title {
        font-size: 1.4rem;
        flex-direction: column;
        gap: var(--spacing-xs);
        line-height: 1.3;
    }
    
    .question-logo {
        margin-right: 0;
        margin-bottom: var(--spacing-sm);
        padding: var(--spacing-sm);
    }
    
    .logo-image-small {
        height: 85px;
    }
    
    .question-title i {
        font-size: 1.4rem;
    }
}

/* Touch-friendly improvements */
.option-card {
    min-height: 80px;
    -webkit-tap-highlight-color: transparent;
}

.option-card:active {
    transform: scale(0.98);
    background: var(--usn-light);
}

.nav-btn, .btn-primary, .btn-secondary {
    min-height: 48px;
    -webkit-tap-highlight-color: transparent;
}

.nav-btn:active, .btn-primary:active, .btn-secondary:active {
    transform: scale(0.95);
}

/* Tablet and larger screens */
@media (min-width: 768px) {
    body {
        padding: var(--spacing-md);
    }
    
    .container {
        border-radius: var(--radius-lg);
        box-shadow: var(--shadow-lg);
        min-height: auto;
        max-height: 90vh;
    }
    
    .header {
        padding: var(--spacing-xl) var(--spacing-lg);
    }
    
    .logo-image {
        height: 140px;
        max-width: 380px;
        filter: brightness(0) invert(1) drop-shadow(0 2px 6px rgba(0,0,0,0.2));
        margin-top: 2rem;
        margin-bottom: 1rem;
    }
    
    .logo-image-small {
        height: 120px;
        max-width: 330px;
    }
    
    .questionnaire-container {
        padding: var(--spacing-xl) var(--spacing-lg);
    }
    
    .options-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        gap: var(--spacing-md);
    }
    
    .option-card {
        text-align: center;
        flex-direction: column;
        min-height: auto;
        padding: var(--spacing-lg);
    }
    
    .option-icon {
        width: auto;
        height: auto;
        background: none;
        border-radius: 0;
        font-size: 2.5rem;
        margin-bottom: var(--spacing-md);
    }
    
    .option-content h3 {
        font-size: 1.3rem;
        margin-bottom: var(--spacing-sm);
    }
    
    .option-content p {
        font-size: 0.9rem;
    }
    
    .products-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
        gap: var(--spacing-lg);
    }
    
    .product-image {
        height: 320px;
        padding: var(--spacing-xs);
    }
    
    .results-actions {
        flex-direction: row;
        justify-content: center;
    }
    
    .btn-primary, .btn-secondary {
        width: auto;
        min-width: 200px;
    }
}

/* Large screens */
@media (min-width: 1200px) {
    .container {
        max-width: 1000px;
    }
    
    .product-image {
        height: 360px;
    }
    
    .products-grid {
        grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    }
}

/* Print Styles */
@media print {
    body {
        background: white;
        padding: 0;
    }
    
    .container {
        box-shadow: none;
        border-radius: 0;
    }
    
    .navigation-buttons,
    .results-actions {
        display: none;
    }
    
    .header {
        background: var(--usn-primary) !important;
        -webkit-print-color-adjust: exact;
    }
    
    .product-card {
        break-inside: avoid;
        margin-bottom: var(--spacing-md);
    }
}

/* Enhanced Product Card Styles for Questionnaire Results */
.product-nutrition {
    display: flex;
    gap: 12px;
    margin: 16px 0;
    flex-wrap: wrap;
}

.nutrition-item {
    background: var(--usn-light);
    padding: 8px 12px;
    border-radius: 8px;
    text-align: center;
    flex: 1;
    min-width: 70px;
}

.nutrition-value {
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--usn-primary);
    display: block;
}

.nutrition-label {
    font-size: 0.75rem;
    color: #666;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.product-benefits li {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 8px;
    color: #555;
}

.product-benefits li i {
    color: var(--usn-success);
    font-size: 0.9rem;
}

.product-formats,
.product-flavors {
    display: flex;
    align-items: center;
    gap: 8px;
    margin: 8px 0;
    color: #666;
    font-size: 0.9rem;
}

.product-formats i,
.product-flavors i {
    color: var(--usn-secondary);
    width: 16px;
}

.product-usage {
    background: rgba(26, 35, 126, 0.05);
    padding: 12px;
    border-radius: 8px;
    margin: 16px 0;
    border-left: 4px solid var(--usn-primary);
}

.product-usage i {
    color: var(--usn-primary);
    margin-right: 8px;
}

.product-actions {
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid #eee;
}



/* Responsive adjustments for enhanced cards */
@media (max-width: 700px) {
    .product-nutrition {
        flex-direction: column;
        gap: 8px;
    }
    
    .nutrition-item {
        flex: none;
    }
    
    .product-formats span,
    .product-flavors span {
        font-size: 0.8rem;
    }
}