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

:root {
    /* Light Theme Colors */
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-code: #f5f5f5;
    --text-primary: #333333;
    --text-secondary: #666666;
    --border-color: #dddddd;
    --border-focus: #007bff;
    
    /* Status Colors */
    --success: #28a745;
    --error: #dc3545;
    --warning: #ffc107;
    --info: #007bff;
    
    /* Button Colors */
    --btn-primary: #007bff;
    --btn-primary-hover: #0056b3;
    --btn-secondary: #6c757d;
    --btn-secondary-hover: #5a6268;
    
    /* Syntax Highlighting */
    --json-key: #0451a5;
    --json-string: #a31515;
    --json-number: #098658;
    --json-boolean: #0000ff;
    --json-null: #808080;
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    
    /* Typography */
    --font-mono: 'Monaco', 'Menlo', 'Ubuntu Mono', 'Consolas', 'Courier New', monospace;
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    
    /* Transitions */
    --transition: all 0.3s ease;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Container */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-lg);
    width: 100%;
    flex: 1;
    display: flex;
    flex-direction: column;
}

/* Header */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 2px solid var(--border-color);
}

header h1 {
    font-size: 2rem;
    color: var(--text-primary);
    font-weight: 600;
}

.header-controls {
    display: flex;
    gap: var(--spacing-sm);
}

/* Icon Button */
.icon-btn {
    background: var(--bg-code);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-sm) var(--spacing-md);
    cursor: pointer;
    font-size: 1.2rem;
    transition: var(--transition);
}

.icon-btn:hover {
    background: var(--border-color);
    transform: scale(1.05);
}

.icon-btn:focus {
    outline: 2px solid var(--btn-primary);
    outline-offset: 2px;
}

/* Main Content */
main.split-view {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: var(--spacing-lg);
    flex: 1;
    min-height: 0;
}

/* Panels */
.panel {
    display: flex;
    flex-direction: column;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
}

.panel-header h2 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
}

/* Code Areas */
.code-area {
    flex: 1;
    padding: var(--spacing-md);
    font-family: var(--font-mono);
    font-size: 14px;
    line-height: 1.5;
    background: var(--bg-code);
    border: none;
    resize: none;
    color: var(--text-primary);
    overflow: auto;
}

.code-area:focus {
    outline: none;
    background: var(--bg-primary);
}

textarea.code-area {
    min-height: 400px;
}

pre.code-area {
    margin: 0;
    white-space: pre;
    overflow-x: auto;
    min-height: 400px;
}

#json-code {
    display: block;
    font-family: inherit;
    font-size: inherit;
    line-height: inherit;
}

/* Input Wrapper */
.input-wrapper {
    position: relative;
    flex: 1;
    display: flex;
    overflow: hidden;
}

.input-wrapper .code-area {
    padding-left: 60px;
}

.input-wrapper .line-numbers {
    position: absolute;
    left: 0;
    top: 0;
    padding: var(--spacing-md);
    font-family: var(--font-mono);
    font-size: 14px;
    line-height: 1.5;
    color: var(--text-secondary);
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    user-select: none;
    text-align: right;
    min-width: 40px;
    pointer-events: none;
    white-space: pre;
    overflow: hidden;
    height: 100%;
}

/* Output Wrapper */
.output-wrapper {
    position: relative;
    flex: 1;
    display: flex;
    overflow: hidden;
}

.line-numbers {
    position: absolute;
    left: 0;
    top: 0;
    padding: var(--spacing-md);
    font-family: var(--font-mono);
    font-size: 14px;
    line-height: 1.5;
    color: var(--text-secondary);
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    user-select: none;
    text-align: right;
    min-width: 40px;
    white-space: pre;
    overflow: hidden;
    height: 100%;
}

.output-wrapper .code-area {
    padding-left: 60px;
    width: 100%;
}

/* Input Info */
.input-info {
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
}

.info-text {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* Status Indicator */
.status-indicator {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 500;
}

.status-indicator.valid {
    background: rgba(40, 167, 69, 0.1);
    color: var(--success);
}

.status-indicator.invalid {
    background: rgba(220, 53, 69, 0.1);
    color: var(--error);
}

.status-indicator.ready {
    background: rgba(0, 123, 255, 0.1);
    color: var(--info);
}

.status-text::before {
    content: '●';
    margin-right: var(--spacing-xs);
}

/* Controls */
.controls {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    padding: var(--spacing-md) 0;
    align-items: center;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    width: 100%;
    max-width: 200px;
}

/* Buttons */
button {
    font-family: var(--font-sans);
    font-size: 0.95rem;
    font-weight: 500;
    padding: var(--spacing-sm) var(--spacing-lg);
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
}

button:focus {
    outline: 2px solid var(--btn-primary);
    outline-offset: 2px;
}

.primary-btn {
    background: var(--btn-primary);
    color: white;
    box-shadow: 0 2px 4px rgba(0, 123, 255, 0.2);
}

.primary-btn:hover {
    background: var(--btn-primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(0, 123, 255, 0.3);
}

.primary-btn:active {
    transform: translateY(0);
}

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

.secondary-btn:hover {
    background: var(--bg-secondary);
    border-color: var(--text-secondary);
}

.btn-icon {
    font-size: 1.1rem;
}

/* Select */
select {
    font-family: var(--font-sans);
    font-size: 0.9rem;
    padding: var(--spacing-sm);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: white;
    color: var(--text-primary);
    cursor: pointer;
}

select:focus {
    outline: 2px solid var(--btn-primary);
    outline-offset: 2px;
}

.indent-label {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
}

/* Error Message */
.error-message {
    padding: var(--spacing-md);
    background: rgba(220, 53, 69, 0.1);
    border: 1px solid var(--error);
    border-radius: var(--radius-sm);
    color: var(--error);
    font-family: var(--font-mono);
    font-size: 0.9rem;
    margin: var(--spacing-md);
}

.error-message.hidden {
    display: none;
}

/* Toast Notification */
.toast {
    position: fixed;
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    background: var(--text-primary);
    color: white;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    font-size: 0.95rem;
    font-weight: 500;
    z-index: 1000;
    animation: slideIn 0.3s ease;
}

.toast.hidden {
    display: none;
}

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

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

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

/* Footer */
footer {
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
}

footer > p:first-child {
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: var(--spacing-lg);
}

.footer-nav {
    margin-top: var(--spacing-lg);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.footer-section h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.footer-section p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.footer-section ul {
    list-style: none;
    padding: 0;
}

.footer-section ul li {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
    padding-left: var(--spacing-md);
    position: relative;
}

.footer-section ul li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--btn-primary);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-color);
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.footer-bottom a {
    color: var(--btn-primary);
    text-decoration: none;
}

.footer-bottom a:hover {
    text-decoration: underline;
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Responsive Design */
@media (max-width: 1024px) {
    main.split-view {
        grid-template-columns: 1fr;
        grid-template-rows: auto auto auto;
    }
    
    .controls {
        flex-direction: row;
        flex-wrap: wrap;
        justify-content: center;
        padding: var(--spacing-md);
    }
    
    .control-group {
        flex-direction: row;
        max-width: none;
    }
}

@media (max-width: 768px) {
    .container {
        padding: var(--spacing-md);
    }
    
    header h1 {
        font-size: 1.5rem;
    }
    
    .control-group {
        width: 100%;
    }
    
    .toast {
        left: var(--spacing-md);
        right: var(--spacing-md);
    }
}

@media (max-width: 480px) {
    header {
        flex-direction: column;
        gap: var(--spacing-sm);
        text-align: center;
    }
    
    .code-area {
        font-size: 12px;
    }
}

/* Accessibility - High Contrast Mode */
@media (prefers-contrast: high) {
    :root {
        --border-color: #000000;
        --text-secondary: #000000;
    }
}

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