/* CSS Variables for Theme Management */
:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary-color: #64748b;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
    --info-color: #06b6d4;
    
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #e2e8f0;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --border-color: #e2e8f0;
    --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);
    
    --transition: all 0.2s ease-in-out;
    --border-radius: 8px;
    --border-radius-lg: 12px;
}

/* 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-sm: 0 1px 2px 0 rgb(0 0 0 / 0.3);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.3), 0 2px 4px -2px rgb(0 0 0 / 0.3);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.3), 0 4px 6px -4px rgb(0 0 0 / 0.3);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: var(--transition);
}

/* App Container */
.app-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
.header {
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.app-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.header-controls {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* Dropdown Styles */
.dropdown {
    position: relative;
    display: inline-block;
}

.dropdown-toggle {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    border: none;
    background: none;
    padding: 0.5rem 0.75rem;
    border-radius: var(--border-radius);
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    transition: var(--transition);
    text-decoration: none;
}

.dropdown-toggle:hover {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}

.dropdown-toggle i.fa-chevron-down {
    font-size: 0.75rem;
    transition: var(--transition);
}

.dropdown.active .dropdown-toggle i.fa-chevron-down {
    transform: rotate(180deg);
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    right: 0;
    min-width: 200px;
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: var(--transition);
    margin-top: 0.25rem;
}

.dropdown.active .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    transition: var(--transition);
    border-bottom: 1px solid var(--border-color);
}

.dropdown-item:last-child {
    border-bottom: none;
}

.dropdown-item:hover {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
}

.dropdown-item i {
    width: 16px;
    text-align: center;
    font-size: 0.875rem;
}

.dropdown-divider {
    height: 1px;
    background-color: var(--border-color);
    margin: 0.25rem 0;
}

/* Main Content */
.main-content {
    flex: 1;
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem;
    width: 100%;
}

/* Format Selector */
.format-selector {
    margin-bottom: 1rem;
}

/* Welcome Banner */
.welcome-banner {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 1rem;
    border-radius: var(--border-radius-lg);
    margin-bottom: 1rem;
    text-align: center;
    box-shadow: var(--shadow-md);
}

.welcome-content h2 {
    margin: 0 0 0.25rem 0;
    font-size: 1.25rem;
    font-weight: 600;
}

.welcome-content p {
    margin: 0;
    opacity: 0.9;
    font-size: 0.9rem;
}

.tabs {
    display: flex;
    gap: 0.25rem;
    background-color: var(--bg-secondary);
    padding: 0.25rem;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    width: fit-content;
}

.tab-btn {
    padding: 0.75rem 1.5rem;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-weight: 500;
    border-radius: calc(var(--border-radius) - 2px);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.tab-btn:hover {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}

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

/* Section Styles */
.input-section,
.conversion-section,
.output-section {
    margin-bottom: 1.5rem;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.section-header h2 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

/* Button Styles */
.btn {
    padding: 0.5rem 1rem;
    border: none;
    border-radius: var(--border-radius);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
    font-size: 0.875rem;
    line-height: 1;
}

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

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

.btn-primary:hover:not(:disabled) {
    background-color: var(--primary-hover);
}

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

.btn-secondary:hover:not(:disabled) {
    background-color: var(--bg-secondary);
    border-color: var(--text-muted);
}

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

.btn-success:hover:not(:disabled) {
    background-color: #059669;
}

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

.btn-warning:hover:not(:disabled) {
    background-color: #d97706;
}

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

.btn-info:hover:not(:disabled) {
    background-color: #0891b2;
}

.btn-icon {
    padding: 0.5rem;
    aspect-ratio: 1;
}

.btn-coffee {
    background: linear-gradient(135deg, #8B4513 0%, #D2691E 100%);
    color: white;
    border: none;
    box-shadow: 0 2px 8px rgba(139, 69, 19, 0.3);
}

.btn-coffee:hover:not(:disabled) {
    background: linear-gradient(135deg, #A0522D 0%, #CD853F 100%);
    box-shadow: 0 4px 12px rgba(139, 69, 19, 0.4);
    transform: translateY(-1px);
}

.btn-coffee:active {
    transform: translateY(0);
    box-shadow: 0 2px 6px rgba(139, 69, 19, 0.3);
}

/* Coffee Banner Styles */
.coffee-banner {
    background: linear-gradient(135deg, #8B4513 0%, #D2691E 50%, #CD853F 100%);
    color: white;
    padding: 2rem 1rem;
    margin: 2rem 0 0 0;
    border-radius: var(--border-radius-lg);
    box-shadow: 0 4px 20px rgba(139, 69, 19, 0.3);
    position: relative;
    overflow: hidden;
}

.coffee-banner::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="20" cy="20" r="2" fill="rgba(255,255,255,0.1)"/><circle cx="80" cy="30" r="1.5" fill="rgba(255,255,255,0.1)"/><circle cx="40" cy="60" r="1" fill="rgba(255,255,255,0.1)"/><circle cx="70" cy="70" r="2.5" fill="rgba(255,255,255,0.1)"/><circle cx="10" cy="80" r="1.5" fill="rgba(255,255,255,0.1)"/></svg>') repeat;
    opacity: 0.3;
    pointer-events: none;
}

.coffee-banner-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
    position: relative;
    z-index: 1;
    max-width: 1200px;
    margin: 0 auto;
}

.coffee-banner-text h3 {
    margin: 0 0 0.5rem 0;
    font-size: 1.5rem;
    font-weight: 600;
}

.coffee-banner-text p {
    margin: 0;
    opacity: 0.9;
    font-size: 1rem;
}

.coffee-banner-btn {
    background: rgba(255, 255, 255, 0.2);
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius);
    text-decoration: none;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition);
    border: 2px solid rgba(255, 255, 255, 0.3);
    backdrop-filter: blur(10px);
    white-space: nowrap;
}

.coffee-banner-btn:hover {
    background: rgba(255, 255, 255, 0.3);
    border-color: rgba(255, 255, 255, 0.5);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.2);
}

.coffee-banner-btn:active {
    transform: translateY(0);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

/* Share Button Styling */
.share-btn {
    position: relative;
    background: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
    border: none;
    box-shadow: 0 2px 8px rgba(59, 130, 246, 0.3);
    transition: all 0.3s ease;
}

.share-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.4);
    background: linear-gradient(135deg, #2563eb 0%, #1e40af 100%);
}

.share-btn:active {
    transform: translateY(0);
    box-shadow: 0 2px 8px rgba(59, 130, 246, 0.3);
}

/* Control Groups */
.input-controls,
.output-controls {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

/* Editor Container */
.editor-container {
    position: relative;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    overflow: hidden;
}

.editor-container textarea {
    width: 100%;
    min-height: 200px;
    padding: 1rem;
    border: none;
    background: transparent;
    color: var(--text-primary);
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.875rem;
    line-height: 1.5;
    resize: vertical;
    outline: none;
}

.editor-container textarea::placeholder {
    color: var(--text-muted);
}

.editor-status {
    padding: 0.5rem 1rem;
    background-color: var(--bg-tertiary);
    border-top: 1px solid var(--border-color);
    font-size: 0.75rem;
    color: var(--text-secondary);
    display: flex;
    justify-content: space-between;
    align-items: center;
    min-height: 2rem;
}

/* Conversion Section */
.conversion-section {
    background-color: var(--bg-secondary);
    padding: 1.5rem;
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--border-color);
}

.conversion-controls {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
    margin-bottom: 1rem;
}

/* Better spacing for options in split view */
.main-content-container.split-view .csv-options,
.main-content-container.split-view .hex-options,
.main-content-container.split-view .base64-options,
.main-content-container.split-view .url-options,
.main-content-container.split-view .color-options {
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
    margin-bottom: 1rem;
}

/* General spacing for all options */
.csv-options,
.hex-options,
.base64-options,
.url-options,
.color-options {
    margin-top: 0.5rem;
    padding-top: 0.5rem;
    border-top: 1px solid var(--border-color);
    margin-bottom: 0.4rem;
    padding-bottom: 0.2rem;
}

/* Options Container - Horizontal layout above split view */
.options-container {
    margin: 0.25rem 0 0.5rem 0;
    padding: 0.3rem;
    background-color: var(--bg-secondary);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
}

.options-container .csv-options,
.options-container .hex-options,
.options-container .base64-options,
.options-container .url-options,
.options-container .color-options {
    display: none;
    margin-bottom: 0,3rem;
    padding: 0.25rem;
    background-color: var(--bg-primary);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
}

.options-container .csv-options:last-child,
.options-container .hex-options:last-child,
.options-container .base64-options:last-child,
.options-container .url-options:last-child,
.options-container .color-options:last-child {
    margin-bottom: 0;
}

/* Show options when they are set to display block by JavaScript */
.options-container .csv-options[style*="display: block"],
.options-container .hex-options[style*="display: block"],
.options-container .base64-options[style*="display: block"],
.options-container .url-options[style*="display: block"],
.options-container .color-options[style*="display: block"] {
    display: block !important;
}

/* Horizontal grid layout for options */
.options-container .options-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-top: 0.75rem;
}

/* Options section headers */
.options-container .csv-options h3,
.options-container .hex-options h3,
.options-container .base64-options h3,
.options-container .url-options h3,
.options-container .color-options h3 {
    margin: 0 0 0.75rem 0;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--primary-color);
}

/* Responsive design for options container */
@media (max-width: 768px) {
    .options-container {
        margin: 0.75rem 0 1rem 0;
        padding: 0.75rem;
    }
    
    .options-container .options-grid {
        grid-template-columns: 1fr;
        gap: 0.75rem;
    }
    
    .options-container .csv-options,
    .options-container .hex-options,
    .options-container .base64-options,
    .options-container .url-options,
    .options-container .color-options {
        padding: 0.5rem;
        margin-bottom: 0.75rem;
    }
}

@media (max-width: 480px) {
    .options-container {
        margin: 0.5rem 0 0.75rem 0;
        padding: 0.5rem;
    }
    
    .options-container .csv-options,
    .options-container .hex-options,
    .options-container .base64-options,
    .options-container .url-options,
    .options-container .color-options {
        padding: 0.375rem;
        margin-bottom: 0.5rem;
    }
}

/* CSV Conversion Hint */
.csv-conversion-hint {
    background: linear-gradient(135deg, #e3f2fd 0%, #f3e5f5 100%);
    border: 1px solid #2196f3;
    border-radius: 8px;
    padding: 15px;
    margin: 15px 0;
    box-shadow: 0 2px 8px rgba(33, 150, 243, 0.2);
    animation: slideIn 0.3s ease-out;
}

.csv-conversion-hint .hint-content {
    display: flex;
    align-items: center;
    gap: 10px;
    color: #1976d2;
    font-weight: 500;
}

.csv-conversion-hint .hint-content i {
    font-size: 18px;
    color: #2196f3;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Options section headers */
.csv-options h3,
.hex-options h3,
.base64-options h3,
.url-options h3,
.color-options h3 {
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--primary-color);
}

.main-content-container.split-view .options-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
}

/* General options grid spacing */
.options-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
}

.option-group {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    margin-bottom: 0.75rem;
    padding: 0.5rem;
    background-color: var(--bg-primary);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
}

.option-group:last-child {
    margin-bottom: 0;
}

.option-group label {
    display: block;
    margin-bottom: 0.25rem;
    font-weight: 500;
    color: var(--text-primary);
    font-size: 0.875rem;
}

.option-group select,
.option-group input[type="checkbox"] {
    width: 100%;
    margin-top: 0.25rem;
    padding: 0.375rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-size: 0.8rem;
}

.option-group input[type="checkbox"] {
    width: auto;
    padding: 0;
}

/* Footer */
.footer {
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 1rem;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* Toast Notifications */
.toast-container {
    position: fixed;
    top: 1rem;
    right: 1rem;
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.toast {
    padding: 0.75rem 1rem;
    border-radius: var(--border-radius);
    color: white;
    font-weight: 500;
    box-shadow: var(--shadow-lg);
    transform: translateX(100%);
    transition: transform 0.3s ease-in-out;
    max-width: 300px;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.toast.show {
    transform: translateX(0);
}

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

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

.toast.info {
    background-color: var(--info-color);
}

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

/* Status Indicators */
.status-valid {
    color: var(--success-color);
}

.status-invalid {
    color: var(--error-color);
}

.status-info {
    color: var(--info-color);
}

/* Loading Animation */
.loading {
    display: inline-block;
    width: 1rem;
    height: 1rem;
    border: 2px solid var(--border-color);
    border-top: 2px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* Responsive Design */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
    
    .app-title {
        font-size: 1.25rem;
    }
    
    .main-content {
        padding: 1rem;
    }
    
    .section-header {
        flex-direction: column;
        align-items: stretch;
    }
    
    .input-controls,
    .output-controls,
    .conversion-controls {
        justify-content: center;
    }
    
    .tabs {
        width: 100%;
        justify-content: center;
    }
    
    .options-grid {
        grid-template-columns: 1fr;
    }
    
    .toast-container {
        left: 1rem;
        right: 1rem;
    }
    
    .toast {
        max-width: none;
    }
    
    .modal-content {
        width: 95%;
        margin: 1rem;
    }
    
    .modal-header,
    .modal-body {
        padding: 1rem;
    }
    
    .url-container {
        flex-direction: column;
    }
    
    .share-options {
        justify-content: center;
    }
    
    .coffee-banner-content {
        flex-direction: column;
        text-align: center;
        gap: 1.5rem;
    }
    
    .coffee-banner-text h3 {
        font-size: 1.25rem;
    }
    
    .coffee-banner-text p {
        font-size: 0.9rem;
    }
    
    .coffee-banner-btn {
        padding: 0.875rem 1.75rem;
        font-size: 1rem;
    }
}

@media (max-width: 480px) {
    .conversion-controls {
        flex-direction: column;
    }
    
    .btn {
        justify-content: center;
        width: 100%;
    }
    
    .input-controls,
    .output-controls {
        flex-direction: column;
    }
}

/* Print Styles */
@media print {
    .header,
    .footer,
    .conversion-section,
    .input-controls,
    .output-controls {
        display: none;
    }
    
    .main-content {
        max-width: none;
        padding: 0;
    }
    
    .editor-container {
        border: 1px solid #000;
        break-inside: avoid;
    }
}

/* Focus Styles for Accessibility */
.btn:focus,
.tab-btn:focus,
select:focus,
textarea:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Modal Styles */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.modal.show {
    display: flex !important;
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background-color: var(--bg-primary);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
    max-width: 500px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
    transform: scale(0.9);
    transition: var(--transition);
}

.modal.show .modal-content {
    transform: scale(1);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h3 {
    margin: 0;
    color: var(--text-primary);
    font-size: 1.25rem;
    font-weight: 600;
}

.modal-body {
    padding: 1.5rem;
}

.modal-body p {
    margin: 0 0 1rem 0;
    color: var(--text-secondary);
}

/* URL Container */
.url-container {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.url-container input {
    flex: 1;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.875rem;
    outline: none;
}

.url-container input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.1);
}

/* Share Options */
.share-options {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

/* QR Code Container */
#qrContainer {
    text-align: center;
    padding: 1rem;
    background-color: var(--bg-secondary);
    border-radius: var(--border-radius);
    margin-bottom: 1rem;
}

#qrCanvas {
    max-width: 200px;
    width: 200px;
    height: 200px;
    border-radius: var(--border-radius);
    background-color: white;
    border: 1px solid var(--border-color);
    display: block;
    margin: 0 auto;
}

/* Share Info */
.share-info {
    padding: 1rem;
    background-color: var(--bg-secondary);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
}

.share-info small {
    color: var(--text-muted);
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
    line-height: 1.4;
}

.share-info i {
    margin-top: 0.1rem;
    flex-shrink: 0;
}

/* URL Status Indicator */
.url-status {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: 0.5rem;
    font-size: 0.875rem;
}

.url-status.success {
    color: var(--success-color);
}

.url-status.warning {
    color: var(--warning-color);
}

.url-status.error {
    color: var(--error-color);
}

/* Share Button States */
.btn.sharing {
    position: relative;
    color: transparent !important;
}

.btn.sharing::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 1rem;
    height: 1rem;
    border: 2px solid currentColor;
    border-top: 2px solid transparent;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    color: white;
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
    :root {
        --border-color: #000000;
        --text-muted: #000000;
    }
    
    [data-theme="dark"] {
        --border-color: #ffffff;
        --text-muted: #ffffff;
    }
    
    .modal {
        background-color: rgba(0, 0, 0, 0.8);
    }
}

/* Feature Request Form Styles */
.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-primary);
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 0.9rem;
    transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

.form-group small {
    display: block;
    margin-top: 0.25rem;
    color: var(--text-tertiary);
    font-size: 0.8rem;
}

.form-actions {
    display: flex;
    gap: 1rem;
    justify-content: flex-end;
    margin-top: 2rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.feature-request-info {
    margin-top: 1.5rem;
    padding: 1rem;
    background-color: var(--bg-secondary);
    border-radius: var(--border-radius);
    border-left: 4px solid var(--info-color);
}

.feature-request-info small {
    color: var(--text-secondary);
    font-size: 0.85rem;
    line-height: 1.4;
}

.feature-request-info i {
    color: var(--info-color);
    margin-right: 0.5rem;
}

/* Features Section */
.features-section {
    margin: 3rem 0;
    padding: 2rem 0;
}

.features-section h2 {
    text-align: center;
    margin-bottom: 2rem;
    color: var(--text-primary);
    font-size: 2rem;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    max-width: 1000px;
    margin: 0 auto;
}

.feature-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: 1.5rem;
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.feature-icon {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.feature-card h3 {
    margin: 0 0 0.5rem 0;
    color: var(--text-primary);
    font-size: 1.25rem;
}

.feature-card p {
    margin: 0;
    color: var(--text-secondary);
    line-height: 1.5;
}

.feature-card a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
}

.feature-card a:hover {
    text-decoration: underline;
}

/* Reduced Motion Support */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Font fallback to prevent loading errors */
@font-face {
    font-family: 'Lato';
    src: local('Arial'), local('Helvetica'), local('sans-serif');
    font-display: swap;
}

/* Drag & Drop Zone Styles */
.drag-drop-zone {
    border: 2px dashed var(--border-color);
    border-radius: var(--border-radius);
    padding: 1rem;
    text-align: center;
    background-color: var(--bg-secondary);
    transition: var(--transition);
    margin: 0.75rem 0;
    position: relative;
    overflow: hidden;
}

.drag-drop-zone.drag-over {
    border-color: var(--primary-color);
    background-color: rgba(37, 99, 235, 0.05);
    transform: scale(1.02);
}

.drag-drop-zone.hidden {
    display: none;
}

.drag-drop-content {
    pointer-events: none;
}

.drag-drop-content i {
    font-size: 1.5rem;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
    display: block;
}

.drag-drop-content h3 {
    margin: 0 0 0.25rem 0;
    color: var(--text-primary);
    font-size: 1rem;
    font-weight: 600;
}

.drag-drop-content p {
    margin: 0 0 0.75rem 0;
    color: var(--text-secondary);
    font-size: 0.8rem;
}

.drag-drop-content button {
    pointer-events: all;
}

/* Split View Controls */
.split-view-controls {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin: 0.75rem 0;
    padding: 0.5rem 0.75rem;
    background-color: var(--bg-secondary);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
}

.split-view-controls .btn {
    padding: 0.5rem;
    min-width: auto;
}

.split-view-label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
}

/* Main Content Container */
.main-content-container {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    transition: var(--transition);
}

.main-content-container.split-view {
    flex-direction: row;
    align-items: flex-start;
    gap: 1rem;
}

.main-content-container.split-view .input-section,
.main-content-container.split-view .output-section {
    flex: 1;
    min-width: 0; /* Prevents flex items from overflowing */
}

.main-content-container.split-view .conversion-section {
    flex: 0 0 auto; /* Don't grow or shrink, maintain natural width */
    width: 350px; /* Wider to accommodate better spacing */
    margin: 0;
    padding: 2rem;
    min-height: 100%; /* Take full height to align with sections */
    overflow-y: auto; /* Allow scrolling if content is too tall */
    max-height: 100vh; /* Prevent overflow beyond viewport */
}

.main-content-container.split-view .conversion-controls {
    flex-direction: column;
    gap: 0.75rem;
    margin-bottom: 2rem;
}

/* General conversion controls spacing */
.conversion-controls {
    margin-bottom: 2rem;
}

.main-content-container.split-view .conversion-controls .btn {
    width: 100%;
    justify-content: center;
    font-size: 0.9rem;
    padding: 0.75rem 1rem;
    min-height: 44px; /* Better touch target */
}

/* Responsive Design */
@media (max-width: 768px) {
    .main-content {
        padding: 0.75rem;
    }
    
    .welcome-banner {
        padding: 0.75rem;
        margin-bottom: 0.75rem;
    }
    
    .welcome-content h2 {
        font-size: 1.1rem;
    }
    
    .welcome-content p {
        font-size: 0.8rem;
    }
    
    .drag-drop-zone {
        padding: 0.75rem;
        margin: 0.5rem 0;
    }
    
    .drag-drop-content i {
        font-size: 1.25rem;
    }
    
    .drag-drop-content h3 {
        font-size: 0.9rem;
    }
    
    .section-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }
    
    .section-header h2 {
        font-size: 1.1rem;
    }
    
    .main-content-container.split-view {
        flex-direction: column;
    }
    
    .main-content-container.split-view .conversion-section {
        display: block; /* Show conversion section on mobile */
    }
    
    .split-view-controls {
        justify-content: center;
    }
    
    .tabs {
        flex-wrap: wrap;
        gap: 0.125rem;
    }
    
    .tab-btn {
        padding: 0.5rem 0.75rem;
        font-size: 0.875rem;
    }
}

@media (max-width: 480px) {
    .main-content {
        padding: 0.5rem;
    }
    
    .header-content {
        padding: 0 0.75rem;
    }
    
    .app-title {
        font-size: 1.25rem;
    }
    
    .welcome-banner {
        padding: 0.5rem;
    }
    
    .drag-drop-zone {
        padding: 0.5rem;
    }
    
    .section-header {
        margin-bottom: 0.5rem;
    }
    
    .input-controls,
    .output-controls {
        flex-wrap: wrap;
        gap: 0.25rem;
    }
    
    .btn {
        padding: 0.5rem 0.75rem;
        font-size: 0.875rem;
    }
}

/* Drag & Drop Animation */
@keyframes dragPulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

.drag-drop-zone.drag-over .drag-drop-content i {
    animation: dragPulse 0.6s ease-in-out infinite;
}

/* Enhanced Visual Feedback */
.drag-drop-zone::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg, transparent 30%, rgba(37, 99, 235, 0.1) 50%, transparent 70%);
    opacity: 0;
    transition: var(--transition);
}

.drag-drop-zone.drag-over::before {
    opacity: 1;
    animation: shimmer 1.5s ease-in-out infinite;
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

/* Ad Container Styles */
.ad-container {
    margin: 2rem 0;
    padding: 1rem;
    text-align: center;
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    min-height: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.ad-wrapper {
    width: 100%;
    max-width: 728px;
    margin: 0 auto;
}

.ad-container .adsbygoogle {
    width: 100%;
    height: auto;
    min-height: 90px;
}

/* Hide ad containers by default - will be shown by JavaScript if ads are available */
.ad-container {
    display: none !important;
}

.ad-container.show {
    display: flex !important;
}

/* Top ad container specific styling */
.ad-container-top {
    margin: 0 0 2rem 0;
    border-radius: 0;
    border-left: none;
    border-right: none;
    border-top: none;
}

/* Responsive ad container */
@media (max-width: 768px) {
    .ad-container {
        margin: 1rem 0;
        padding: 0.5rem;
        min-height: 50px;
    }
    
    .ad-container .adsbygoogle {
        min-height: 50px;
    }
    
    .ad-container-top {
        margin: 0 0 1rem 0;
    }
}