:root {
    /* Color System */
    --color-primary: hsl(348, 83%, 47%); /* MIGROS Red */
    --color-primary-light: hsl(348, 83%, 57%);
    --color-primary-dark: hsl(348, 83%, 37%);
    
    --color-secondary: hsl(210, 100%, 45%); /* USB Blue */
    --color-secondary-light: hsl(210, 100%, 55%);
    --color-secondary-dark: hsl(210, 100%, 35%);
    
    --color-accent: hsl(142, 71%, 45%); /* Success Green */
    --color-warning: hsl(38, 92%, 50%); /* Warning Orange */
    --color-danger: hsl(0, 72%, 51%); /* Danger Red */
    
    --color-dark: hsl(222, 47%, 11%);
    --color-dark-light: hsl(222, 47%, 21%);
    --color-gray: hsl(220, 9%, 46%);
    --color-gray-light: hsl(220, 9%, 96%);
    --color-white: hsl(0, 0%, 100%);
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    --gradient-secondary: linear-gradient(135deg, var(--color-secondary) 0%, var(--color-secondary-dark) 100%);
    --gradient-hero: linear-gradient(135deg, hsl(222, 47%, 11%) 0%, hsl(222, 47%, 18%) 100%);
    --gradient-glass: linear-gradient(135deg, rgba(255, 255, 255, 0.1) 0%, rgba(255, 255, 255, 0.05) 100%);
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
    
    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    --space-2xl: 4rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    
    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-md);
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-md) 0;
}

.logo-group {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.logo-migros, .logo-usb {
    height: 40px;
    width: auto;
    transition: transform var(--transition-base);
}

.logo-migros:hover, .logo-usb:hover {
    transform: scale(1.05);
}

.divider {
    width: 1px;
    height: 30px;
    background: var(--color-gray);
    opacity: 0.3;
}

.nav {
    display: flex;
    gap: var(--space-lg);
}

.nav-link {
    position: relative;
    padding: var(--space-xs) var(--space-sm);
    color: var(--color-dark);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: color var(--transition-fast);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: width var(--transition-base);
}

.nav-link:hover, .nav-link.active {
    color: var(--color-primary);
}

.nav-link:hover::after, .nav-link.active::after {
    width: 100%;
}

/* Hero Section */
.hero {
    position: relative;
    margin-top: 80px;
    padding: var(--space-2xl) 0;
    background: var(--gradient-hero);
    color: var(--color-white);
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        radial-gradient(circle at 20% 50%, rgba(214, 40, 40, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 30%, rgba(0, 102, 204, 0.15) 0%, transparent 50%);
    animation: gradient-shift 15s ease infinite;
}

@keyframes gradient-shift {
    0%, 100% { opacity: 0.5; }
    50% { opacity: 0.8; }
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--space-md);
    animation: fadeInUp 0.8s ease;
}

.gradient-text {
    background: linear-gradient(135deg, var(--color-primary-light) 0%, var(--color-secondary-light) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: 1.25rem;
    line-height: 1.8;
    opacity: 0.9;
    margin-bottom: var(--space-xl);
    animation: fadeInUp 0.8s ease 0.2s backwards;
}

.hero-actions {
    display: flex;
    gap: var(--space-md);
    justify-content: center;
    flex-wrap: wrap;
    animation: fadeInUp 0.8s ease 0.4s backwards;
}

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

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-md) var(--space-xl);
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
    white-space: nowrap;
}

.btn-icon {
    width: 20px;
    height: 20px;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--color-white);
    box-shadow: 0 4px 14px 0 rgba(214, 40, 40, 0.39);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(214, 40, 40, 0.5);
}

.btn-secondary {
    background: var(--color-white);
    color: var(--color-dark);
    box-shadow: var(--shadow-md);
}

.btn-secondary:hover {
    background: var(--color-gray-light);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

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

.btn-analyze {
    width: 100%;
    max-width: 400px;
    margin: var(--space-lg) auto 0;
    background: var(--gradient-secondary);
    color: var(--color-white);
    box-shadow: 0 4px 14px 0 rgba(0, 102, 204, 0.39);
}

.btn-analyze:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 102, 204, 0.5);
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-lg);
    margin-top: var(--space-2xl);
    animation: fadeInUp 0.8s ease 0.6s backwards;
}

.stat-card {
    background: var(--gradient-glass);
    backdrop-filter: blur(10px);
    padding: var(--space-lg);
    border-radius: var(--radius-lg);
    text-align: center;
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: transform var(--transition-base);
}

.stat-card:hover {
    transform: translateY(-5px);
}

.stat-number {
    font-size: 3rem;
    font-weight: 700;
    color: var(--color-white);
    margin-bottom: var(--space-xs);
}

.stat-label {
    font-size: 0.95rem;
    opacity: 0.9;
}

/* Sections */
section {
    padding: var(--space-2xl) 0;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--space-md);
    color: var(--color-dark);
}

.section-subtitle {
    font-size: 1.125rem;
    text-align: center;
    color: var(--color-gray);
    margin-bottom: var(--space-xl);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

/* Attributes Grid */
.attributes {
    background: var(--color-white);
}

.attributes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: var(--space-md);
}

.attribute-card {
    background: var(--color-white);
    padding: var(--space-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    text-align: center;
    transition: all var(--transition-base);
    border: 2px solid transparent;
}

.attribute-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
    border-color: var(--color-primary);
}

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

.attribute-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-dark);
}

/* Upload Section */
.upload-container {
    max-width: 800px;
    margin: 0 auto;
}

.upload-area {
    border: 3px dashed var(--color-gray);
    border-radius: var(--radius-xl);
    padding: var(--space-2xl);
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-base);
    background: var(--color-white);
}

.upload-area:hover {
    border-color: var(--color-primary);
    background: var(--color-gray-light);
}

.upload-area.dragover {
    border-color: var(--color-secondary);
    background: rgba(0, 102, 204, 0.05);
}

.upload-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--space-md);
    color: var(--color-gray);
    transition: color var(--transition-base);
}

.upload-area:hover .upload-icon {
    color: var(--color-primary);
}

.upload-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-dark);
    margin-bottom: var(--space-xs);
}

.upload-subtitle {
    font-size: 1.125rem;
    color: var(--color-gray);
    margin-bottom: var(--space-sm);
}

.upload-formats {
    font-size: 0.875rem;
    color: var(--color-gray);
}

.preview-container {
    position: relative;
    max-width: 600px;
    margin: var(--space-lg) auto;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
}

.preview-container img {
    width: 100%;
    height: auto;
    display: block;
}

.btn-remove {
    position: absolute;
    top: var(--space-md);
    right: var(--space-md);
    width: 40px;
    height: 40px;
    background: var(--color-danger);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform var(--transition-base);
    box-shadow: var(--shadow-lg);
}

.btn-remove:hover {
    transform: scale(1.1);
}

.btn-remove svg {
    width: 20px;
    height: 20px;
    stroke: white;
    stroke-width: 3;
}

/* Results */
.results-container {
    max-width: 900px;
    margin: var(--space-xl) auto 0;
    background: var(--color-white);
    padding: var(--space-xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    animation: fadeInUp 0.6s ease;
}

.results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-lg);
    padding-bottom: var(--space-md);
    border-bottom: 2px solid var(--color-gray-light);
}

.results-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--color-dark);
}

.results-score {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.score-label {
    font-size: 1rem;
    color: var(--color-gray);
}

.score-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-accent);
}

.results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: var(--space-md);
    margin-bottom: var(--space-lg);
}

.result-item {
    padding: var(--space-md);
    border-radius: var(--radius-md);
    background: var(--color-gray-light);
    transition: all var(--transition-base);
}

.result-item.detected {
    background: rgba(16, 185, 129, 0.1);
    border: 2px solid var(--color-accent);
}

.result-item.not-detected {
    opacity: 0.5;
}

.result-name {
    font-weight: 600;
    margin-bottom: var(--space-xs);
}

.result-confidence {
    font-size: 0.875rem;
    color: var(--color-gray);
}

.results-actions {
    display: flex;
    gap: var(--space-md);
    justify-content: center;
    padding-top: var(--space-lg);
    border-top: 2px solid var(--color-gray-light);
}

/* Guide Section */
.guide {
    background: var(--color-gray-light);
}

.guide-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-lg);
}

.guide-card {
    background: var(--color-white);
    padding: var(--space-xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    text-align: center;
    transition: all var(--transition-base);
}

.guide-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-2xl);
}

.guide-icon {
    font-size: 4rem;
    margin-bottom: var(--space-md);
}

.guide-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--space-md);
    color: var(--color-dark);
}

.guide-description {
    color: var(--color-gray);
    margin-bottom: var(--space-lg);
    line-height: 1.8;
}

/* API Section */
.api {
    background: var(--color-dark);
    color: var(--color-white);
}

.api .section-title {
    color: var(--color-white);
}

.api .section-subtitle {
    color: rgba(255, 255, 255, 0.8);
}

.api-grid {
    display: grid;
    gap: var(--space-lg);
    margin-bottom: var(--space-xl);
}

.api-card {
    background: var(--gradient-glass);
    backdrop-filter: blur(10px);
    padding: var(--space-xl);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.api-endpoint {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-secondary-light);
    margin-bottom: var(--space-sm);
    font-family: 'Courier New', monospace;
}

.api-description {
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: var(--space-md);
}

.code-block {
    background: var(--color-dark-light);
    padding: var(--space-md);
    border-radius: var(--radius-md);
    overflow-x: auto;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.code-block code {
    font-family: 'Courier New', monospace;
    font-size: 0.875rem;
    line-height: 1.6;
    color: var(--color-secondary-light);
    white-space: pre;
}

.api-info {
    text-align: center;
    padding: var(--space-lg);
    background: var(--gradient-glass);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.api-info a {
    color: var(--color-secondary-light);
    text-decoration: none;
    font-weight: 600;
    transition: color var(--transition-fast);
}

.api-info a:hover {
    color: var(--color-primary-light);
}

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

.footer-content {
    text-align: center;
}

.footer-logos {
    display: flex;
    gap: var(--space-lg);
    justify-content: center;
    align-items: center;
    margin-bottom: var(--space-md);
}

.footer-logo {
    height: 50px;
    width: auto;
    filter: brightness(0) invert(1);
    opacity: 0.8;
    transition: opacity var(--transition-base);
}

.footer-logo:hover {
    opacity: 1;
}

.footer-text {
    opacity: 0.8;
    line-height: 1.8;
}

/* Loading Spinner */
.spinner {
    display: inline-block;
    width: 40px;
    height: 40px;
    border: 4px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: var(--color-primary);
    animation: spin 1s ease-in-out infinite;
}

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

/* Responsive Design */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.125rem;
    }
    
    .hero-actions {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
    
    .nav {
        display: none; /* Mobile menu would go here */
    }
    
    .logo-group {
        gap: var(--space-sm);
    }
    
    .logo-migros, .logo-usb {
        height: 30px;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .results-header {
        flex-direction: column;
        gap: var(--space-md);
    }
}

/* Utility Classes */
.hidden {
    display: none !important;
}

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

.mt-1 { margin-top: var(--space-xs); }
.mt-2 { margin-top: var(--space-sm); }
.mt-3 { margin-top: var(--space-md); }
.mt-4 { margin-top: var(--space-lg); }

.mb-1 { margin-bottom: var(--space-xs); }
.mb-2 { margin-bottom: var(--space-sm); }
.mb-3 { margin-bottom: var(--space-md); }
.mb-4 { margin-bottom: var(--space-lg); }