/* Lumina - Free 4K Image Enhancement */
/* Design System: Acid Neon + Brutalist Concrete hybrid */

:root {
    /* Primary Palette - Acid Neon */
    --neon-lime: #CCFF00;
    --neon-pink: #FF3CAC;
    --dark-void: #0D0D0D;
    --deep-navy: #1A1A2E;
    
    /* Secondary Palette - Brutalist Concrete */
    --concrete-light: #D9D4CE;
    --concrete-mid: #A39E93;
    --concrete-dark: #3C3C3C;
    --brutal-orange: #FF4500;
    
    /* Typography */
    --font-display: 'Clash Display', sans-serif;
    --font-body: 'Plus Jakarta Sans', sans-serif;
    
    /* Spacing Scale */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2.5rem;
    --space-xl: 4rem;
    --space-2xl: 6rem;
    --space-3xl: 10rem;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Border Radius - Minimal for brutalist feel */
    --radius-sm: 2px;
    --radius-md: 4px;
    --radius-lg: 8px;
}

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

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

body {
    font-family: var(--font-body);
    background-color: var(--dark-void);
    color: var(--concrete-light);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Noise Texture Overlay */
.noise-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 9999;
    opacity: 0.03;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: var(--space-md) var(--space-lg);
    background: rgba(13, 13, 13, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(204, 255, 0, 0.1);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    text-decoration: none;
    color: var(--concrete-light);
}

.logo-icon {
    font-size: 1.5rem;
    color: var(--neon-lime);
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.6; }
}

.logo-text {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 600;
    letter-spacing: -0.02em;
}

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

.nav-link {
    color: var(--concrete-mid);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    transition: color var(--transition-fast);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--neon-lime);
    transition: width var(--transition-base);
}

.nav-link:hover {
    color: var(--concrete-light);
}

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

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-3xl) var(--space-lg);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(204, 255, 0, 0.08) 0%, transparent 70%);
    pointer-events: none;
}

.hero-content {
    text-align: center;
    max-width: 900px;
    position: relative;
    z-index: 1;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-xs) var(--space-md);
    background: rgba(204, 255, 0, 0.1);
    border: 1px solid rgba(204, 255, 0, 0.3);
    border-radius: var(--radius-lg);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--neon-lime);
    margin-bottom: var(--space-lg);
}

.badge-dot {
    width: 6px;
    height: 6px;
    background: var(--neon-lime);
    border-radius: 50%;
    animation: blink 1.5s ease-in-out infinite;
}

@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.3; }
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(3rem, 8vw, 6rem);
    font-weight: 600;
    line-height: 1;
    letter-spacing: -0.03em;
    margin-bottom: var(--space-md);
}

.title-line {
    display: block;
}

.title-line.highlight {
    color: var(--neon-lime);
    position: relative;
    display: inline-block;
}

.title-line.highlight::after {
    content: '';
    position: absolute;
    bottom: 0.1em;
    left: -0.1em;
    right: -0.1em;
    height: 0.15em;
    background: var(--neon-pink);
    z-index: -1;
    opacity: 0.3;
}

.hero-subtitle {
    font-size: 1.125rem;
    color: var(--concrete-mid);
    max-width: 600px;
    margin: 0 auto var(--space-xl);
    line-height: 1.7;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: var(--space-xl);
    flex-wrap: wrap;
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 600;
    color: var(--neon-lime);
    line-height: 1;
}

.stat-label {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--concrete-mid);
    margin-top: var(--space-xs);
}

/* Upload Section */
.upload-section {
    padding: var(--space-3xl) var(--space-lg);
    background: linear-gradient(180deg, var(--dark-void) 0%, var(--deep-navy) 100%);
}

.upload-container {
    max-width: 800px;
    margin: 0 auto;
}

.upload-area {
    border: 2px dashed var(--concrete-mid);
    border-radius: var(--radius-lg);
    padding: var(--space-3xl) var(--space-xl);
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-base);
    position: relative;
    background: rgba(26, 26, 46, 0.5);
}

.upload-area:hover {
    border-color: var(--neon-lime);
    background: rgba(204, 255, 0, 0.03);
}

.upload-area.dragover {
    border-color: var(--neon-lime);
    background: rgba(204, 255, 0, 0.08);
    transform: scale(1.02);
}

.upload-icon {
    color: var(--neon-lime);
    margin-bottom: var(--space-md);
    opacity: 0.8;
}

.upload-title {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 500;
    margin-bottom: var(--space-xs);
    color: var(--concrete-light);
}

.upload-subtitle {
    color: var(--concrete-mid);
    margin-bottom: var(--space-lg);
}

.upload-formats {
    display: flex;
    justify-content: center;
    gap: var(--space-lg);
    font-size: 0.75rem;
    color: var(--concrete-mid);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.upload-formats span {
    padding: var(--space-xs) var(--space-sm);
    background: rgba(163, 158, 147, 0.1);
    border-radius: var(--radius-sm);
}

/* Upload Preview */
.upload-preview {
    text-align: center;
}

.preview-container {
    position: relative;
    display: inline-block;
    margin-bottom: var(--space-lg);
}

.preview-container img {
    max-width: 100%;
    max-height: 400px;
    border-radius: var(--radius-md);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

.remove-btn {
    position: absolute;
    top: -12px;
    right: -12px;
    width: 36px;
    height: 36px;
    background: var(--brutal-orange);
    border: none;
    border-radius: 50%;
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform var(--transition-fast);
}

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

.enhance-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-xl);
    background: var(--neon-lime);
    color: var(--dark-void);
    border: none;
    border-radius: var(--radius-md);
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.enhance-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(204, 255, 0, 0.3);
}

.btn-icon {
    transition: transform var(--transition-base);
}

.enhance-btn:hover .btn-icon {
    transform: translateX(4px);
}

/* Comparison Section */
.comparison-section {
    padding: var(--space-3xl) var(--space-lg);
    background: var(--dark-void);
}

.section-header {
    text-align: center;
    margin-bottom: var(--space-2xl);
}

.section-title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 600;
    margin-bottom: var(--space-sm);
    color: var(--concrete-light);
}

.section-subtitle {
    color: var(--concrete-mid);
    font-size: 1.125rem;
}

.comparison-container {
    max-width: 1000px;
    margin: 0 auto var(--space-2xl);
}

.comparison-wrapper {
    position: relative;
    width: 100%;
    aspect-ratio: 16/9;
    overflow: hidden;
    border-radius: var(--radius-md);
    cursor: col-resize;
    box-shadow: 0 30px 80px rgba(0, 0, 0, 0.6);
}

.comparison-image {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

.comparison-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.comparison-image.before {
    z-index: 1;
}

.comparison-image.after {
    z-index: 2;
    width: 50%;
    border-right: 2px solid var(--neon-lime);
}

.comparison-label {
    position: absolute;
    bottom: var(--space-md);
    padding: var(--space-xs) var(--space-sm);
    background: rgba(13, 13, 13, 0.8);
    color: var(--concrete-light);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    border-radius: var(--radius-sm);
}

.comparison-image.before .comparison-label {
    left: var(--space-md);
}

.comparison-image.after .comparison-label {
    right: var(--space-md);
}

.comparison-slider {
    position: absolute;
    top: 0;
    left: 50%;
    width: 40px;
    height: 100%;
    transform: translateX(-50%);
    z-index: 3;
    cursor: col-resize;
}

.slider-handle {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 48px;
    height: 48px;
    background: var(--neon-lime);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--dark-void);
    box-shadow: 0 4px 20px rgba(204, 255, 0, 0.4);
    transition: transform var(--transition-fast);
}

.comparison-slider:hover .slider-handle {
    transform: translate(-50%, -50%) scale(1.1);
}

/* Download Section */
.download-section {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.enhancement-info {
    display: flex;
    justify-content: center;
    gap: var(--space-xl);
    margin-bottom: var(--space-xl);
    flex-wrap: wrap;
}

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

.info-label {
    display: block;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--concrete-mid);
    margin-bottom: var(--space-xs);
}

.info-value {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--concrete-light);
}

.download-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-xl);
    background: transparent;
    color: var(--neon-lime);
    border: 2px solid var(--neon-lime);
    border-radius: var(--radius-md);
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.download-btn:hover {
    background: var(--neon-lime);
    color: var(--dark-void);
}

/* Features Section */
.features-section {
    padding: var(--space-3xl) var(--space-lg);
    background: var(--deep-navy);
}

.features-grid {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-lg);
}

.feature-card {
    padding: var(--space-xl);
    background: rgba(13, 13, 13, 0.5);
    border: 1px solid rgba(163, 158, 147, 0.2);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
}

.feature-card:hover {
    border-color: var(--neon-lime);
    transform: translateY(-4px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.feature-icon {
    color: var(--neon-lime);
    margin-bottom: var(--space-md);
}

.feature-title {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--space-sm);
    color: var(--concrete-light);
}

.feature-desc {
    color: var(--concrete-mid);
    font-size: 0.9375rem;
    line-height: 1.7;
}

/* How It Works Section */
.how-it-works {
    padding: var(--space-3xl) var(--space-lg);
    background: var(--dark-void);
}

.steps-container {
    max-width: 1000px;
    margin: 0 auto;
    display: flex;
    align-items: flex-start;
    justify-content: center;
    gap: var(--space-lg);
    flex-wrap: wrap;
}

.step {
    flex: 1;
    min-width: 250px;
    max-width: 300px;
    text-align: center;
}

.step-number {
    font-family: var(--font-display);
    font-size: 4rem;
    font-weight: 700;
    color: transparent;
    -webkit-text-stroke: 1px var(--neon-lime);
    line-height: 1;
    margin-bottom: var(--space-md);
    opacity: 0.5;
}

.step-title {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--space-sm);
    color: var(--concrete-light);
}

.step-desc {
    color: var(--concrete-mid);
    font-size: 0.9375rem;
    line-height: 1.7;
}

.step-connector {
    width: 60px;
    height: 2px;
    background: linear-gradient(90deg, var(--neon-lime), transparent);
    margin-top: 2rem;
    opacity: 0.3;
}

/* FAQ Section */
.faq-section {
    padding: var(--space-3xl) var(--space-lg);
    background: var(--deep-navy);
}

.faq-container {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    border-bottom: 1px solid rgba(163, 158, 147, 0.2);
}

.faq-question {
    width: 100%;
    padding: var(--space-lg) 0;
    background: none;
    border: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    color: var(--concrete-light);
    font-family: var(--font-display);
    font-size: 1.125rem;
    font-weight: 500;
    text-align: left;
    transition: color var(--transition-fast);
}

.faq-question:hover {
    color: var(--neon-lime);
}

.faq-icon {
    transition: transform var(--transition-base);
    flex-shrink: 0;
    margin-left: var(--space-md);
}

.faq-item.active .faq-icon {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-slow), padding var(--transition-slow);
}

.faq-item.active .faq-answer {
    max-height: 200px;
    padding-bottom: var(--space-lg);
}

.faq-answer p {
    color: var(--concrete-mid);
    line-height: 1.7;
}

/* Footer */
.footer {
    padding: var(--space-2xl) var(--space-lg) var(--space-lg);
    background: var(--dark-void);
    border-top: 1px solid rgba(163, 158, 147, 0.1);
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    text-align: center;
}

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

.footer-brand .logo-icon {
    font-size: 1.25rem;
}

.footer-brand .logo-text {
    font-size: 1.25rem;
}

.footer-text {
    color: var(--concrete-mid);
    margin-bottom: var(--space-lg);
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: var(--space-lg);
    margin-bottom: var(--space-xl);
}

.footer-link {
    color: var(--concrete-mid);
    text-decoration: none;
    font-size: 0.875rem;
    transition: color var(--transition-fast);
}

.footer-link:hover {
    color: var(--neon-lime);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--space-lg);
    border-top: 1px solid rgba(163, 158, 147, 0.1);
}

.footer-bottom p {
    color: var(--concrete-mid);
    font-size: 0.875rem;
}

/* Processing Overlay */
.processing-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(13, 13, 13, 0.95);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(10px);
}

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

.processing-spinner {
    width: 60px;
    height: 60px;
    border: 3px solid rgba(204, 255, 0, 0.2);
    border-top-color: var(--neon-lime);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto var(--space-lg);
}

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

.processing-title {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--concrete-light);
    margin-bottom: var(--space-xs);
}

.processing-subtitle {
    color: var(--concrete-mid);
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .hero-stats {
        gap: var(--space-lg);
    }
    
    .stat-number {
        font-size: 2rem;
    }
    
    .upload-area {
        padding: var(--space-xl) var(--space-md);
    }
    
    .enhancement-info {
        flex-direction: column;
        gap: var(--space-md);
    }
    
    .steps-container {
        flex-direction: column;
        align-items: center;
    }
    
    .step-connector {
        width: 2px;
        height: 40px;
        margin: 0;
        background: linear-gradient(180deg, var(--neon-lime), transparent);
    }
    
    .comparison-wrapper {
        aspect-ratio: 4/3;
    }
}

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

.hero-content > * {
    animation: fadeInUp 0.8s ease forwards;
    opacity: 0;
}

.hero-content > *:nth-child(1) { animation-delay: 0.1s; }
.hero-content > *:nth-child(2) { animation-delay: 0.2s; }
.hero-content > *:nth-child(3) { animation-delay: 0.3s; }
.hero-content > *:nth-child(4) { animation-delay: 0.4s; }

/* Selection Color */
::selection {
    background: var(--neon-lime);
    color: var(--dark-void);
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--dark-void);
}

::-webkit-scrollbar-thumb {
    background: var(--concrete-mid);
    border-radius: var(--radius-sm);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--neon-lime);
}