/* CSS Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Light Theme Colors */
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --border-color: #e2e8f0;
    --shadow-light: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-medium: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-large: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    /* Brand Colors */
    --primary-50: #eef2ff;
    --primary-100: #e0e7ff;
    --primary-500: #6366f1;
    --primary-600: #5b21b6;
    --primary-700: #4c1d95;
    
    --secondary-50: #faf5ff;
    --secondary-100: #f3e8ff;
    --secondary-500: #a855f7;
    --secondary-600: #9333ea;
    --secondary-700: #7c3aed;
    
    --accent-50: #fff7ed;
    --accent-100: #ffedd5;
    --accent-500: #f97316;
    --accent-600: #ea580c;
    
    --success-500: #10b981;
    --warning-500: #f59e0b;
    --error-500: #ef4444;
    
    /* Spacing */
    --spacing-1: 0.25rem;
    --spacing-2: 0.5rem;
    --spacing-3: 0.75rem;
    --spacing-4: 1rem;
    --spacing-6: 1.5rem;
    --spacing-8: 2rem;
    --spacing-12: 3rem;
    --spacing-16: 4rem;
    --spacing-20: 5rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    
    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-medium: 300ms ease-in-out;
    --transition-slow: 500ms ease-in-out;
}

/* Dark Theme */
[data-theme="dark"] {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-muted: #64748b;
    --border-color: #334155;
    --shadow-light: 0 1px 3px 0 rgba(0, 0, 0, 0.3), 0 1px 2px 0 rgba(0, 0, 0, 0.2);
    --shadow-medium: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -1px rgba(0, 0, 0, 0.2);
    --shadow-large: 0 20px 25px -5px rgba(0, 0, 0, 0.4), 0 10px 10px -5px rgba(0, 0, 0, 0.2);
}

/* Base Typography */
body {
    font-family: 'Inter', -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-medium), color var(--transition-medium);
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-6);
}

/* Theme Toggle */
.theme-toggle {
    position: fixed;
    top: var(--spacing-6);
    right: var(--spacing-6);
    z-index: 1000;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--spacing-3);
    width: 48px;
    height: 48px;
    cursor: pointer;
    transition: all var(--transition-medium);
    backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    justify-content: center;
}

.theme-toggle:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-medium);
}

.theme-toggle .sun-icon,
.theme-toggle .moon-icon {
    position: absolute;
    transition: all var(--transition-medium);
    font-size: 1.2rem;
}

.theme-toggle .sun-icon {
    opacity: 1;
    transform: rotate(0deg);
    color: var(--accent-500);
}

.theme-toggle .moon-icon {
    opacity: 0;
    transform: rotate(180deg);
    color: var(--primary-500);
}

[data-theme="dark"] .theme-toggle .sun-icon {
    opacity: 0;
    transform: rotate(180deg);
}

[data-theme="dark"] .theme-toggle .moon-icon {
    opacity: 1;
    transform: rotate(0deg);
}

/* Header */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    transition: all var(--transition-medium);
}

[data-theme="dark"] .header {
    background: rgba(15, 23, 42, 0.8);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 80px;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    cursor: pointer;
    transition: transform var(--transition-fast);
}

.logo:hover {
    transform: translateY(-1px);
}

.logo-icon {
    background: linear-gradient(135deg, var(--primary-500), var(--secondary-500));
    padding: var(--spacing-3);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-medium);
    display: flex;
    align-items: center;
    justify-content: center;
}

.logo-icon i {
    color: white;
    font-size: 1.5rem;
}

.logo-text h1 {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-500), var(--secondary-500));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo-text span {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.nav-menu {
    display: flex;
    gap: var(--spacing-2);
}

.nav-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    padding: var(--spacing-3) var(--spacing-4);
    background: transparent;
    border: none;
    border-radius: var(--radius-lg);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-weight: 500;
}

.nav-btn:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    transform: translateY(-1px);
}

.nav-btn.active {
    background: var(--primary-50);
    color: var(--primary-700);
}

[data-theme="dark"] .nav-btn.active {
    background: var(--primary-600);
    color: white;
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-2);
}

.mobile-menu-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: all var(--transition-fast);
}

/* Main Content */
.main-content {
    min-height: calc(100vh - 80px - 80px); /* Account for header and footer */
}

.section {
    display: none;
    min-height: calc(100vh - 80px - 80px);
    padding: var(--spacing-8) 0;
}

.section.active {
    display: block;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-12);
}

.back-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-2);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    padding: var(--spacing-2) var(--spacing-4);
    border-radius: var(--radius-lg);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    margin-bottom: var(--spacing-6);
    font-weight: 500;
}

.back-btn:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    transform: translateX(-2px);
}

.section-header h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-4);
    background: linear-gradient(135deg, var(--primary-500), var(--secondary-500));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-header p {
    font-size: 1.2rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* Hero Section */
.hero {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-16);
    align-items: center;
    margin-bottom: var(--spacing-20);
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: var(--spacing-6);
}

.gradient-text {
    background: linear-gradient(135deg, var(--primary-500), var(--secondary-500), var(--accent-500));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-8);
    line-height: 1.7;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-4);
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-2);
    padding: var(--spacing-4) var(--spacing-6);
    border-radius: var(--radius-xl);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-medium);
    text-decoration: none;
    border: none;
    font-size: 1rem;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left var(--transition-slow);
}

.btn:hover::before {
    left: 100%;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-500), var(--secondary-500));
    color: white;
    box-shadow: var(--shadow-medium);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-large);
}

.btn-secondary {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--bg-tertiary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

.btn-outline {
    background: transparent;
    color: var(--primary-500);
    border: 1px solid var(--primary-500);
}

.btn-outline:hover {
    background: var(--primary-500);
    color: white;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}

/* Hero Visual */
.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.floating-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--spacing-6);
    box-shadow: var(--shadow-large);
    transform: translateY(0);
    animation: float 6s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
}

.card-header {
    display: flex;
    align-items: center;
    margin-bottom: var(--spacing-4);
}

.card-dots {
    display: flex;
    gap: var(--spacing-2);
}

.card-dots span {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--text-muted);
}

.card-dots span:nth-child(1) { background: var(--error-500); }
.card-dots span:nth-child(2) { background: var(--warning-500); }
.card-dots span:nth-child(3) { background: var(--success-500); }

.card-content {
    font-family: 'Monaco', 'Menlo', monospace;
    font-size: 0.9rem;
}

.code-line {
    margin-bottom: var(--spacing-2);
    display: flex;
    gap: var(--spacing-2);
}

.code-keyword { color: var(--primary-500); font-weight: 600; }
.code-var { color: var(--secondary-500); }
.code-operator { color: var(--text-muted); }
.code-string { color: var(--success-500); }
.code-bracket { color: var(--text-primary); }

.pulse-indicator {
    width: 8px;
    height: 8px;
    background: var(--success-500);
    border-radius: 50%;
    animation: pulse 2s ease-in-out infinite;
}

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

/* Features Grid */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-8);
}

.feature-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--spacing-8);
    cursor: pointer;
    transition: all var(--transition-medium);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-500), var(--secondary-500));
    transform: scaleX(0);
    transition: transform var(--transition-medium);
}

.feature-card:hover::before {
    transform: scaleX(1);
}

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

.feature-icon {
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, var(--primary-500), var(--secondary-500));
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-6);
}

.feature-icon i {
    color: white;
    font-size: 1.5rem;
}

.feature-card h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-3);
    color: var(--text-primary);
}

.feature-card p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-6);
    line-height: 1.6;
}

.feature-arrow {
    display: flex;
    justify-content: flex-end;
}

.feature-arrow i {
    color: var(--primary-500);
    transition: transform var(--transition-fast);
}

.feature-card:hover .feature-arrow i {
    transform: translateX(4px);
}

/* Mode Toggle */
.mode-toggle {
    display: flex;
    justify-content: center;
    margin-bottom: var(--spacing-8);
    background: var(--bg-secondary);
    border-radius: var(--radius-xl);
    padding: var(--spacing-1);
    width: fit-content;
    margin-left: auto;
    margin-right: auto;
}

.mode-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    padding: var(--spacing-3) var(--spacing-6);
    background: transparent;
    border: none;
    border-radius: var(--radius-lg);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-weight: 500;
}

.mode-btn.active {
    background: var(--primary-500);
    color: white;
    box-shadow: var(--shadow-medium);
}

/* Panel Styles */
.panel {
    display: none;
}

.panel.active {
    display: block;
}

.panel-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-8);
}

.input-section,
.output-section {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--spacing-8);
}

.input-group {
    margin-bottom: var(--spacing-6);
}

.input-group label {
    display: block;
    font-weight: 600;
    margin-bottom: var(--spacing-2);
    color: var(--text-primary);
}

.input-group input,
.input-group textarea {
    width: 100%;
    padding: var(--spacing-4);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-family: inherit;
    transition: all var(--transition-fast);
    resize: vertical;
}

.input-group textarea {
    min-height: 120px;
}

.input-group input:focus,
.input-group textarea:focus {
    outline: none;
    border-color: var(--primary-500);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

/* File Upload Areas */
.file-upload-area,
.image-upload-area {
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--spacing-8);
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-medium);
    margin-bottom: var(--spacing-6);
    position: relative;
    overflow: hidden;
}

.file-upload-area:hover,
.image-upload-area:hover {
    border-color: var(--primary-500);
    background: var(--primary-50);
}

[data-theme="dark"] .file-upload-area:hover,
[data-theme="dark"] .image-upload-area:hover {
    background: rgba(99, 102, 241, 0.1);
}

.upload-content {
    pointer-events: none;
}

.upload-content i {
    font-size: 3rem;
    color: var(--primary-500);
    margin-bottom: var(--spacing-4);
}

.upload-content h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-2);
}

.upload-content p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-2);
}

.upload-hint {
    font-size: 0.9rem;
    color: var(--text-muted);
}

.image-preview {
    max-width: 100%;
    max-height: 200px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-medium);
}

/* Output Section */
.output-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-6);
}

.output-header h3 {
    font-size: 1.25rem;
    font-weight: 600;
}

.output-content textarea {
    width: 100%;
    min-height: 150px;
    padding: var(--spacing-4);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-family: 'Monaco', 'Menlo', monospace;
    font-size: 0.9rem;
    resize: vertical;
}

.output-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-4);
    margin-top: var(--spacing-6);
    padding-top: var(--spacing-6);
    border-top: 1px solid var(--border-color);
}

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

.stat-label {
    display: block;
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: var(--spacing-1);
}

.stat-value {
    display: block;
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

.stat-value.success {
    color: var(--success-500);
}

/* Canvas Styles */
.image-canvas {
    max-width: 100%;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-medium);
}

.canvas-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 200px;
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-lg);
    color: var(--text-muted);
}

.canvas-placeholder i {
    font-size: 3rem;
    margin-bottom: var(--spacing-4);
}

/* Info Tabs */
.info-tabs {
    display: flex;
    justify-content: center;
    gap: var(--spacing-2);
    margin-bottom: var(--spacing-8);
    background: var(--bg-secondary);
    border-radius: var(--radius-xl);
    padding: var(--spacing-1);
    width: fit-content;
    margin-left: auto;
    margin-right: auto;
}

.tab-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    padding: var(--spacing-3) var(--spacing-6);
    background: transparent;
    border: none;
    border-radius: var(--radius-lg);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-weight: 500;
}

.tab-btn.active {
    background: var(--primary-500);
    color: white;
    box-shadow: var(--shadow-medium);
}

/* Info Panel */
.info-panel {
    display: none;
}

.info-panel.active {
    display: block;
}

.info-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-8);
}

.info-content {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--spacing-8);
}

.info-content h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-4);
    color: var(--text-primary);
}

.info-content p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-6);
    line-height: 1.7;
}

/* Process Steps */
.process-steps {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-6);
}

.step {
    display: flex;
    gap: var(--spacing-4);
}

.step-number {
    width: 32px;
    height: 32px;
    background: var(--primary-500);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    flex-shrink: 0;
}

.step-content h4 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-2);
    color: var(--text-primary);
}

.step-content p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-3);
}

.code-example {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-3);
    font-family: 'Monaco', 'Menlo', monospace;
    font-size: 0.9rem;
    color: var(--text-primary);
}

.code-example .highlight {
    background: var(--accent-500);
    color: white;
    padding: 0 2px;
    border-radius: 2px;
}

/* Demo Visualization */
.demo-visualization {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--spacing-8);
}

.vis-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-6);
}

.vis-card h4 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: var(--spacing-4);
    text-align: center;
}

.demo-input input {
    width: 100%;
    padding: var(--spacing-3);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-family: inherit;
    margin-bottom: var(--spacing-4);
}

.demo-section {
    margin-bottom: var(--spacing-4);
}

.demo-section label {
    display: block;
    font-weight: 600;
    margin-bottom: var(--spacing-2);
    color: var(--text-primary);
}

.binary-display {
    font-family: 'Monaco', 'Menlo', monospace;
    background: var(--bg-secondary);
    padding: var(--spacing-3);
    border-radius: var(--radius-lg);
    word-break: break-all;
    color: var(--primary-500);
    font-size: 0.9rem;
}

.mapping-display {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-2);
}

.mapping-item {
    font-family: 'Monaco', 'Menlo', monospace;
    background: var(--bg-secondary);
    padding: var(--spacing-2) var(--spacing-3);
    border-radius: var(--radius-lg);
    font-size: 0.9rem;
}

/* Pixel Demo */
.pixel-demo {
    text-align: center;
}

.pixel-comparison {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-6);
    margin-bottom: var(--spacing-6);
}

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

.pixel-sample {
    width: 80px;
    height: 80px;
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-3);
    box-shadow: var(--shadow-medium);
}

.original-pixel {
    background: rgb(154, 87, 203);
}

.modified-pixel {
    background: rgb(155, 86, 202);
}

.pixel-arrow {
    font-size: 1.5rem;
    color: var(--primary-500);
    font-weight: bold;
}

.pixel-values {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-1);
    font-family: 'Monaco', 'Menlo', monospace;
    font-size: 0.8rem;
}

.pixel-values span {
    background: var(--bg-secondary);
    padding: var(--spacing-1) var(--spacing-2);
    border-radius: var(--radius-sm);
}

.capacity-info {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-4);
    margin-top: var(--spacing-6);
    padding-top: var(--spacing-6);
    border-top: 1px solid var(--border-color);
}

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

.capacity-label {
    display: block;
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: var(--spacing-1);
}

.capacity-value {
    display: block;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
}

/* Footer */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-6) 0;
    margin-top: var(--spacing-12);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-4);
}

.credits {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
}

.made-by {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.creator-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    color: var(--primary-500);
    text-decoration: none;
    font-weight: 600;
    padding: var(--spacing-2) var(--spacing-4);
    border-radius: var(--radius-lg);
    background: var(--primary-50);
    transition: all var(--transition-fast);
    border: 1px solid transparent;
}

.creator-link:hover {
    background: var(--primary-500);
    color: white;
    transform: translateY(-1px);
    box-shadow: var(--shadow-medium);
}

[data-theme="dark"] .creator-link {
    background: rgba(99, 102, 241, 0.1);
    border-color: var(--primary-500);
}

[data-theme="dark"] .creator-link:hover {
    background: var(--primary-500);
    color: white;
}

.footer-links {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    flex-wrap: wrap;
}

.footer-text {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.footer-separator {
    color: var(--text-muted);
    font-size: 0.8rem;
}

/* Toast Messages */
.toast-container {
    position: fixed;
    top: var(--spacing-6);
    right: var(--spacing-6);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-3);
}

.toast {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-4);
    box-shadow: var(--shadow-large);
    min-width: 300px;
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

.toast.success {
    border-left: 4px solid var(--success-500);
}

.toast.error {
    border-left: 4px solid var(--error-500);
}

.toast.warning {
    border-left: 4px solid var(--warning-500);
}

.toast-icon {
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
}

.toast.success .toast-icon {
    background: var(--success-500);
    color: white;
}

.toast.error .toast-icon {
    background: var(--error-500);
    color: white;
}

.toast.warning .toast-icon {
    background: var(--warning-500);
    color: white;
}

.toast-content {
    flex: 1;
}

.toast-title {
    font-weight: 600;
    margin-bottom: var(--spacing-1);
}

.toast-message {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
}

.loading-content {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    padding: var(--spacing-8);
    text-align: center;
    box-shadow: var(--shadow-large);
}

.loading-spinner {
    width: 48px;
    height: 48px;
    border: 4px solid var(--border-color);
    border-top: 4px solid var(--primary-500);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto var(--spacing-4);
}

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

.loading-text {
    font-weight: 600;
    color: var(--text-primary);
}

/* Responsive Design */
@media (max-width: 1024px) {
    .hero {
        grid-template-columns: 1fr;
        gap: var(--spacing-12);
        text-align: center;
    }
    
    .hero-title {
        font-size: 3rem;
    }
    
    .panel-grid {
        grid-template-columns: 1fr;
    }
    
    .info-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-4);
    }
    
    .nav-menu {
        display: none;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .section-header h2 {
        font-size: 2rem;
    }
    
    .pixel-comparison {
        flex-direction: column;
        gap: var(--spacing-4);
    }
    
    .pixel-arrow {
        transform: rotate(90deg);
    }
    
    .capacity-info {
        grid-template-columns: 1fr;
    }
    
    .toast {
        min-width: auto;
        width: calc(100vw - var(--spacing-8));
    }
    
    .toast-container {
        left: var(--spacing-4);
        right: var(--spacing-4);
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
    
    .footer-links {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .header-content {
        height: 64px;
    }
    
    .logo-text h1 {
        font-size: 1.25rem;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .input-section,
    .output-section {
        padding: var(--spacing-6);
    }
    
    .mode-toggle {
        flex-direction: column;
        width: 100%;
    }
    
    .mode-btn {
        width: 100%;
        justify-content: center;
    }
    
    .info-tabs {
        flex-direction: column;
        width: 100%;
    }
    
    .tab-btn {
        width: 100%;
        justify-content: center;
    }
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 12px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--text-muted);
    border-radius: 6px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

/* Selection */
::selection {
    background: var(--primary-500);
    color: white;
}

/* Focus styles for accessibility */
button:focus,
input:focus,
textarea:focus {
    outline: 2px solid var(--primary-500);
    outline-offset: 2px;
}

/* Print styles */
@media print {
    .theme-toggle,
    .header,
    .back-btn,
    .btn,
    .footer {
        display: none !important;
    }
    
    .section {
        display: block !important;
    }
    
    body {
        background: white !important;
        color: black !important;
    }
}

/* Drag and drop styles */
.drag-over {
    border-color: var(--primary-500) !important;
    background: var(--primary-50) !important;
}

[data-theme="dark"] .drag-over {
    background: rgba(99, 102, 241, 0.1) !important;
}

@keyframes slideOut {
    from {
        transform: translateX(0);
        opacity: 1;
    }
    to {
        transform: translateX(100%);
        opacity: 0;
    }
}