/* Modern Professional BraillePixel Styles */

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

:root {
    /* Color System */
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --accent-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    
    --primary-50: #f8faff;
    --primary-100: #e6f0ff;
    --primary-200: #c4ddff;
    --primary-300: #92c5ff;
    --primary-400: #60a5fa;
    --primary-500: #3b82f6;
    --primary-600: #2563eb;
    --primary-700: #1d4ed8;
    --primary-800: #1e40af;
    --primary-900: #1e3a8a;
    
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    
    --success-500: #10b981;
    --warning-500: #f59e0b;
    --error-500: #ef4444;
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'SF Mono', 'Monaco', monospace;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    
    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    
    /* Animation */
    --transition-fast: 0.15s ease-out;
    --transition-normal: 0.25s ease-out;
    --transition-slow: 0.35s ease-out;
}

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

body {
    font-family: var(--font-primary);
    line-height: 1.6;
    color: var(--gray-800);
    background: var(--gray-50);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Background Elements */
.bg-gradient {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--primary-gradient);
    opacity: 0.03;
    z-index: -2;
}

.bg-pattern {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        radial-gradient(circle at 25% 25%, rgba(103, 126, 234, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 75% 75%, rgba(118, 75, 162, 0.1) 0%, transparent 50%);
    z-index: -1;
}

/* Main Container */
.app-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--space-4);
    gap: var(--space-8);
}

/* Header Styles */
.app-header {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(20px);
    border-radius: var(--radius-2xl);
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: var(--shadow-xl);
    padding: var(--space-10);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.app-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--primary-gradient);
}

.header-content {
    position: relative;
    z-index: 1;
}

.brand-section {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-6);
    margin-bottom: var(--space-6);
    flex-wrap: wrap;
}

.logo-container {
    position: relative;
}

.brand-logo {
    width: 80px;
    height: 80px;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    transition: transform var(--transition-normal);
}

.brand-logo:hover {
    transform: scale(1.05) rotate(5deg);
}

.logo-glow {
    position: absolute;
    top: -10px;
    left: -10px;
    right: -10px;
    bottom: -10px;
    background: var(--primary-gradient);
    border-radius: var(--radius-xl);
    opacity: 0;
    filter: blur(20px);
    transition: opacity var(--transition-normal);
    z-index: -1;
}

.brand-logo:hover + .logo-glow {
    opacity: 0.3;
}

.brand-text {
    text-align: left;
}

.brand-title {
    font-size: 3rem;
    font-weight: 700;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--space-2);
    line-height: 1.1;
}

.brand-subtitle {
    font-size: 1.25rem;
    color: var(--gray-600);
    font-weight: 500;
    margin: 0;
}

.header-description {
    font-size: 1.125rem;
    color: var(--gray-600);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.7;
}

/* Navigation Tabs */
.nav-tabs {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-4);
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    padding: var(--space-6);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-lg);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.nav-tab {
    background: rgba(255, 255, 255, 0.7);
    border: 2px solid transparent;
    border-radius: var(--radius-xl);
    padding: var(--space-6);
    cursor: pointer;
    transition: all var(--transition-normal);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.nav-tab::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;
}

.nav-tab:hover::before {
    left: 100%;
}

.nav-tab:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-400);
}

.nav-tab.active {
    background: var(--primary-gradient);
    color: white;
    border-color: var(--primary-500);
    box-shadow: var(--shadow-xl);
}

.tab-icon {
    font-size: 2rem;
    margin-bottom: var(--space-3);
    display: block;
}

.tab-label {
    font-size: 1.25rem;
    font-weight: 600;
    display: block;
    margin-bottom: var(--space-2);
}

.tab-description {
    font-size: 0.875rem;
    opacity: 0.8;
    font-weight: 400;
}

/* Main Content */
.main-content {
    flex: 1;
}

.content-panel {
    display: none;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(20px);
    border-radius: var(--radius-2xl);
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: var(--shadow-xl);
    padding: var(--space-10);
    margin-bottom: var(--space-8);
}

.content-panel.active {
    display: block;
    animation: fadeInUp 0.3s ease-out;
}

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

.panel-header {
    text-align: center;
    margin-bottom: var(--space-10);
    padding-bottom: var(--space-6);
    border-bottom: 2px solid var(--gray-100);
}

.panel-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--gray-800);
    margin-bottom: var(--space-4);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-4);
}

.panel-icon {
    font-size: 2rem;
}

.panel-description {
    font-size: 1.125rem;
    color: var(--gray-600);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.7;
}

/* Layout Grids */
.input-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-8);
    align-items: start;
}

.input-section,
.settings-section {
    background: var(--gray-50);
    border-radius: var(--radius-xl);
    padding: var(--space-8);
    border: 1px solid var(--gray-200);
}

.section-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: var(--space-6);
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

/* Upload Zone */
.upload-zone {
    border: 3px dashed var(--gray-300);
    border-radius: var(--radius-xl);
    padding: var(--space-8);
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
    background: rgba(255, 255, 255, 0.5);
    min-height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
}

.upload-zone:hover {
    border-color: var(--primary-500);
    background: var(--primary-50);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.upload-zone.dragover {
    border-color: var(--primary-600);
    background: var(--primary-100);
    transform: scale(1.02);
}

.file-input {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
    z-index: 1;
}

.upload-content {
    pointer-events: none;
    z-index: 0;
}

.upload-icon {
    font-size: 3rem;
    margin-bottom: var(--space-4);
    opacity: 0.8;
}

.upload-text {
    font-size: 1.125rem;
    font-weight: 500;
    color: var(--gray-700);
    margin-bottom: var(--space-2);
}

.upload-hint {
    font-size: 0.875rem;
    color: var(--gray-500);
    margin: 0;
}

/* Form Elements */
.text-input-container {
    background: rgba(255, 255, 255, 0.8);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    border: 1px solid var(--gray-200);
}

.text-input {
    width: 100%;
    padding: var(--space-4) var(--space-5);
    border: 2px solid var(--gray-300);
    border-radius: var(--radius-lg);
    font-size: 1rem;
    transition: all var(--transition-normal);
    background: white;
    font-family: var(--font-primary);
}

.text-input:focus {
    outline: none;
    border-color: var(--primary-500);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.text-input.large-text {
    font-size: 1.5rem;
    font-weight: 600;
    text-align: center;
    padding: var(--space-5) var(--space-6);
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.text-input.emoji-input {
    text-align: center;
    font-size: 1.5rem;
    padding: var(--space-3) var(--space-4);
}

.input-hint {
    margin-top: var(--space-3);
    font-size: 0.875rem;
    color: var(--gray-500);
    text-align: center;
    font-style: italic;
}

/* Settings Grid */
.settings-grid {
    display: grid;
    gap: var(--space-6);
    margin-bottom: var(--space-8);
}

.setting-item {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.setting-label {
    display: flex;
    justify-content: between;
    align-items: center;
    font-weight: 500;
    color: var(--gray-700);
}

.label-text {
    flex: 1;
}

.label-value {
    background: var(--primary-500);
    color: white;
    padding: var(--space-1) var(--space-3);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 600;
    min-width: 3rem;
    text-align: center;
}

/* Range Inputs */
.range-input {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 8px;
    background: var(--gray-200);
    border-radius: var(--radius-md);
    outline: none;
    cursor: pointer;
    transition: background var(--transition-normal);
}

.range-input:hover {
    background: var(--gray-300);
}

.range-input::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 24px;
    height: 24px;
    background: var(--primary-gradient);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-fast);
}

.range-input::-webkit-slider-thumb:hover {
    transform: scale(1.1);
    box-shadow: var(--shadow-lg);
}

.range-input::-moz-range-thumb {
    width: 24px;
    height: 24px;
    background: var(--primary-gradient);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: var(--shadow-md);
    border: none;
    transition: transform var(--transition-fast);
}

.range-input::-moz-range-thumb:hover {
    transform: scale(1.1);
}

/* Select Inputs */
.select-input {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    border: 2px solid var(--gray-300);
    border-radius: var(--radius-lg);
    font-size: 1rem;
    background: white;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.select-input:focus {
    outline: none;
    border-color: var(--primary-500);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

/* Radio Groups */
.radio-group {
    display: grid;
    gap: var(--space-4);
    margin-bottom: var(--space-6);
}

.radio-option {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    padding: var(--space-4) var(--space-5);
    background: rgba(255, 255, 255, 0.8);
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-normal);
}

.radio-option:hover {
    background: var(--primary-50);
    border-color: var(--primary-300);
    transform: translateY(-1px);
}

.radio-option:has(.radio-input:checked) {
    background: var(--primary-100);
    border-color: var(--primary-500);
    box-shadow: var(--shadow-md);
}

.radio-input {
    position: absolute;
    opacity: 0;
    cursor: pointer;
}

.radio-custom {
    width: 20px;
    height: 20px;
    border: 2px solid var(--gray-400);
    border-radius: 50%;
    position: relative;
    transition: all var(--transition-normal);
    flex-shrink: 0;
}

.radio-input:checked + .radio-custom {
    border-color: var(--primary-500);
    background: var(--primary-500);
}

.radio-input:checked + .radio-custom::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 8px;
    height: 8px;
    background: white;
    border-radius: 50%;
}

.radio-content {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
}

.radio-title {
    font-weight: 600;
    color: var(--gray-800);
}

.radio-description {
    font-size: 0.875rem;
    color: var(--gray-600);
}

/* Checkbox Groups */
.checkbox-group {
    display: grid;
    gap: var(--space-4);
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    cursor: pointer;
    padding: var(--space-3) var(--space-4);
    background: rgba(255, 255, 255, 0.8);
    border-radius: var(--radius-lg);
    border: 2px solid transparent;
    transition: all var(--transition-normal);
}

.checkbox-label:hover {
    background: var(--primary-50);
    border-color: var(--primary-200);
}

.checkbox-input {
    position: absolute;
    opacity: 0;
    cursor: pointer;
}

.checkbox-custom {
    width: 20px;
    height: 20px;
    border: 2px solid var(--gray-400);
    border-radius: var(--radius-sm);
    position: relative;
    transition: all var(--transition-normal);
    flex-shrink: 0;
}

.checkbox-input:checked + .checkbox-custom {
    border-color: var(--primary-500);
    background: var(--primary-500);
}

.checkbox-input:checked + .checkbox-custom::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
    font-size: 0.75rem;
    font-weight: bold;
}

.checkbox-text {
    font-weight: 500;
    color: var(--gray-700);
}

/* Mode Selector */
.mode-selector {
    background: var(--gray-50);
    border-radius: var(--radius-xl);
    padding: var(--space-8);
    border: 1px solid var(--gray-200);
    margin-bottom: var(--space-8);
}

/* Controls Section */
.controls-section {
    background: rgba(255, 255, 255, 0.5);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    margin-top: var(--space-6);
    border: 1px solid var(--gray-200);
}

.effects-section {
    margin-top: var(--space-6);
    padding: var(--space-6);
    background: rgba(255, 255, 255, 0.5);
    border-radius: var(--radius-lg);
    border: 1px solid var(--gray-200);
}

.effects-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: var(--space-4);
    text-align: center;
}

/* Generate Button */
.generate-button {
    width: 100%;
    background: var(--primary-gradient);
    color: white;
    border: none;
    border-radius: var(--radius-xl);
    padding: var(--space-5) var(--space-6);
    font-size: 1.125rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-3);
    margin-top: var(--space-8);
    box-shadow: var(--shadow-lg);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.generate-button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-2xl);
}

.generate-button:active {
    transform: translateY(0);
}

.button-icon {
    font-size: 1.25rem;
}

/* Output Section */
.output-section {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(20px);
    border-radius: var(--radius-2xl);
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: var(--shadow-xl);
    padding: var(--space-8);
}

.output-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-6);
    padding-bottom: var(--space-4);
    border-bottom: 2px solid var(--gray-100);
    flex-wrap: wrap;
    gap: var(--space-4);
}

.output-title {
    font-size: 1.875rem;
    font-weight: 700;
    color: var(--gray-800);
}

.output-actions {
    display: flex;
    gap: var(--space-3);
}

.action-button {
    background: white;
    border: 2px solid var(--gray-300);
    border-radius: var(--radius-lg);
    padding: var(--space-3) var(--space-4);
    cursor: pointer;
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--gray-700);
}

.action-button:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.action-button.copy {
    border-color: var(--success-500);
    color: var(--success-500);
}

.action-button.copy:hover {
    background: var(--success-500);
    color: white;
}

.action-button.select {
    border-color: var(--primary-500);
    color: var(--primary-500);
}

.action-button.select:hover {
    background: var(--primary-500);
    color: white;
}

.action-button.download {
    border-color: var(--warning-500);
    color: var(--warning-500);
}

.action-button.download:hover {
    background: var(--warning-500);
    color: white;
}

.output-container {
    background: var(--gray-900);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    border: 1px solid var(--gray-700);
    position: relative;
    overflow: hidden;
}

.output-display {
    background: transparent;
    color: var(--gray-100);
    font-family: var(--font-mono);
    font-size: 0.875rem;
    line-height: 1.4;
    white-space: pre;
    overflow: auto;
    max-height: 500px;
    min-height: 200px;
    margin: 0;
    padding: 0;
    border: none;
    resize: none;
    scrollbar-width: thin;
    scrollbar-color: var(--gray-600) var(--gray-800);
}

.output-display::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

.output-display::-webkit-scrollbar-track {
    background: var(--gray-800);
    border-radius: var(--radius-sm);
}

.output-display::-webkit-scrollbar-thumb {
    background: var(--gray-600);
    border-radius: var(--radius-sm);
}

.output-display::-webkit-scrollbar-thumb:hover {
    background: var(--gray-500);
}

/* Footer */
.app-footer {
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-2xl);
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: var(--shadow-lg);
    padding: var(--space-8);
    text-align: center;
}

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

.footer-text {
    color: var(--gray-600);
    font-weight: 500;
}

.footer-links {
    display: flex;
    gap: var(--space-6);
}

.footer-link {
    color: var(--primary-600);
    text-decoration: none;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: var(--space-2);
    transition: all var(--transition-normal);
}

.footer-link:hover {
    color: var(--primary-700);
    transform: translateY(-1px);
}

.link-icon {
    font-size: 1rem;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .input-grid {
        grid-template-columns: 1fr;
        gap: var(--space-6);
    }
    
    .nav-tabs {
        grid-template-columns: 1fr;
    }
    
    .app-container {
        padding: var(--space-3);
        gap: var(--space-6);
    }
}

@media (max-width: 768px) {
    .brand-section {
        flex-direction: column;
        gap: var(--space-4);
    }
    
    .brand-text {
        text-align: center;
    }
    
    .brand-title {
        font-size: 2.5rem;
    }
    
    .panel-title {
        font-size: 2rem;
        flex-direction: column;
        gap: var(--space-2);
    }
    
    .output-header {
        flex-direction: column;
        align-items: stretch;
    }
    
    .output-actions {
        justify-content: center;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
    
    .app-header,
    .content-panel,
    .output-section {
        padding: var(--space-6);
    }
}

@media (max-width: 480px) {
    .app-container {
        padding: var(--space-2);
        gap: var(--space-4);
    }
    
    .brand-title {
        font-size: 2rem;
    }
    
    .brand-logo {
        width: 60px;
        height: 60px;
    }
    
    .nav-tab {
        padding: var(--space-4);
    }
    
    .tab-icon {
        font-size: 1.5rem;
    }
    
    .tab-label {
        font-size: 1.125rem;
    }
    
    .action-button .button-text {
        display: none;
    }
    
    .output-display {
        font-size: 0.75rem;
    }
}

/* Loading and Animation States */
.loading {
    opacity: 0.6;
    pointer-events: none;
    position: relative;
}

.loading::after {
    content: "";
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 32px;
    height: 32px;
    border: 3px solid var(--gray-300);
    border-top: 3px solid var(--primary-500);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: translate(-50%, -50%) rotate(0deg); }
    100% { transform: translate(-50%, -50%) rotate(360deg); }
}

/* Success/Error States */
.upload-zone.success {
    border-color: var(--success-500);
    background: rgba(16, 185, 129, 0.1);
}

.upload-zone.error {
    border-color: var(--error-500);
    background: rgba(239, 68, 68, 0.1);
}

/* Focus visible for accessibility */
.generate-button:focus-visible,
.action-button:focus-visible,
.nav-tab:focus-visible {
    outline: 2px solid var(--primary-500);
    outline-offset: 2px;
}

/* Smooth transitions for all interactive elements */
* {
    transition: border-color var(--transition-fast), 
                box-shadow var(--transition-fast),
                transform var(--transition-fast);
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --gray-300: #999;
        --gray-400: #666;
        --gray-500: #333;
    }
}