/* CSS Custom Properties for Dark Theme */
:root {
    --bg-primary: #1a1a2e;
    --bg-secondary: #16213e;
    --bg-tertiary: #0f0f1a;
    --bg-panel: #1e1e32;
    --bg-input: #252540;
    --bg-hover: #2a2a4a;
    
    --text-primary: #e4e4e7;
    --text-secondary: #a1a1aa;
    --text-muted: #71717a;
    
    --accent-primary: #6366f1;
    --accent-hover: #818cf8;
    --accent-secondary: #3b3b5c;
    
    --border-color: #2e2e4a;
    --border-light: #3a3a5c;
    
    --success: #22c55e;
    --error: #ef4444;
    
    --syntax-key: #f472b6;
    --syntax-string: #a5f3fc;
    --syntax-number: #fbbf24;
    --syntax-boolean: #c084fc;
    --syntax-null: #94a3b8;
    --syntax-brace: #e4e4e7;
    
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    
    --font-mono: 'SF Mono', 'Fira Code', 'Consolas', monospace;
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

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

html {
    font-size: 16px;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.5;
}


/* Header Styles */
.header {
    text-align: center;
    padding: 1.5rem 1rem;
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
}

.header h1 {
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

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

/* Main Container - Responsive Layout */
.main-container {
    display: flex;
    flex-direction: row;
    gap: 1rem;
    padding: 1rem;
    max-width: 1600px;
    margin: 0 auto;
    min-height: calc(100vh - 100px);
}

/* Panel Styles */
.panel {
    flex: 1;
    display: flex;
    flex-direction: column;
    background-color: var(--bg-panel);
    border-radius: 8px;
    border: 1px solid var(--border-color);
    overflow: hidden;
}

.panel-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 1rem;
    gap: 0.75rem;
}

/* Input Panel */
.input-panel .panel-content {
    min-height: 400px;
}

/* Textarea Styles */
.json-textarea {
    flex: 1;
    width: 100%;
    min-height: 300px;
    padding: 1rem;
    font-family: var(--font-mono);
    font-size: 0.875rem;
    line-height: 1.6;
    background-color: var(--bg-input);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    resize: vertical;
    transition: border-color var(--transition-fast);
}

.json-textarea:focus {
    outline: none;
    border-color: var(--accent-primary);
}

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


/* Action Buttons */
.action-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.btn {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    font-weight: 500;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

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

.btn-secondary {
    background-color: var(--accent-secondary);
    color: var(--text-primary);
}

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

/* Status Line */
.status-line {
    min-height: 1.5rem;
    padding: 0.25rem 0.5rem;
    font-size: 0.8rem;
    border-radius: 4px;
}

.status-line.success {
    color: var(--success);
    background-color: rgba(34, 197, 94, 0.1);
}

.status-line.error {
    color: var(--error);
    background-color: rgba(239, 68, 68, 0.1);
}

/* Helper Text */
.helper-text {
    padding: 0.75rem 1rem;
    font-size: 0.8rem;
    color: var(--text-muted);
    background-color: var(--bg-tertiary);
    border-top: 1px solid var(--border-color);
}

/* Tab Navigation */
.tab-navigation {
    display: flex;
    background-color: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-color);
    padding: 0 0.5rem;
}

.tab-btn {
    padding: 0.75rem 1.25rem;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    background: transparent;
    border: none;
    border-bottom: 2px solid transparent;
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

.tab-btn.active {
    color: var(--accent-primary);
    border-bottom-color: var(--accent-primary);
}


/* Tab Content Container */
.tab-content-container {
    flex: 1;
    overflow: hidden;
    position: relative;
}

.tab-content {
    display: none;
    height: 100%;
    overflow: auto;
    padding: 1rem;
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.tab-content.active {
    display: block;
    opacity: 1;
}

/* Code Display (Code Tab) */
.code-display {
    margin: 0;
    padding: 1rem;
    font-family: var(--font-mono);
    font-size: 0.875rem;
    line-height: 1.6;
    background-color: var(--bg-input);
    border-radius: 6px;
    overflow: auto;
    white-space: pre-wrap;
    word-wrap: break-word;
}

.code-display code {
    font-family: inherit;
}

/* Syntax Highlighting Classes */
.json-key {
    color: var(--syntax-key);
}

.json-string {
    color: var(--syntax-string);
}

.json-number {
    color: var(--syntax-number);
}

.json-boolean {
    color: var(--syntax-boolean);
}

.json-null {
    color: var(--syntax-null);
}

.json-brace {
    color: var(--syntax-brace);
}

/* Text Display (Text Tab) */
.text-display {
    margin: 0;
    padding: 1rem;
    font-family: var(--font-mono);
    font-size: 0.875rem;
    line-height: 1.8;
    background-color: var(--bg-input);
    border-radius: 6px;
    overflow: auto;
    white-space: pre-wrap;
}

.text-line {
    padding: 0.25rem 0;
    border-bottom: 1px solid var(--border-color);
    font-family: var(--font-mono);
    font-size: 0.875rem;
    line-height: 1.6;
}

.text-line:last-child {
    border-bottom: none;
}

.text-path {
    color: var(--syntax-key);
}

.text-value {
    color: var(--syntax-string);
}

/* Form Container (Form Tab) */
.form-container {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.form-field {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.form-field label {
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.form-field input[type="text"],
.form-field input[type="number"] {
    padding: 0.5rem;
    font-family: var(--font-mono);
    font-size: 0.875rem;
    background-color: var(--bg-input);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    transition: border-color var(--transition-fast);
}

.form-field input:focus {
    outline: none;
    border-color: var(--accent-primary);
}

.form-field input[type="checkbox"] {
    width: 1.25rem;
    height: 1.25rem;
    accent-color: var(--accent-primary);
}

.form-field-checkbox {
    flex-direction: row;
    align-items: center;
    gap: 0.75rem;
}

.form-field-checkbox label {
    order: 2;
}

.form-field-checkbox input[type="checkbox"] {
    order: 1;
}

.form-readonly {
    padding: 0.5rem;
    font-family: var(--font-mono);
    font-size: 0.875rem;
    background-color: var(--bg-tertiary);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
}

.form-null {
    color: var(--syntax-null);
    font-style: italic;
}

.form-nested {
    white-space: pre-wrap;
    word-wrap: break-word;
    max-height: 150px;
    overflow: auto;
    margin: 0;
}

.form-empty {
    color: var(--text-muted);
    font-style: italic;
    padding: 0.5rem;
}


/* Tree Container (Tree Tab) */
.tree-container {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    line-height: 1.6;
}

.tree-node {
    padding-left: 1.25rem;
}

.tree-node-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.25rem 0;
    cursor: pointer;
    border-radius: 4px;
    transition: background-color var(--transition-fast);
}

.tree-node-header:hover {
    background-color: var(--bg-hover);
}

.tree-toggle {
    width: 1rem;
    height: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    font-size: 0.75rem;
}

.tree-key {
    color: var(--syntax-key);
}

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

.tree-children {
    display: none;
}

.tree-children.expanded {
    display: block;
}

.tree-separator {
    color: var(--text-muted);
}

.tree-value-string {
    color: var(--syntax-string);
}

.tree-value-number {
    color: var(--syntax-number);
}

.tree-value-boolean {
    color: var(--syntax-boolean);
}

.tree-value-null {
    color: var(--syntax-null);
    font-style: italic;
}

.tree-value-object,
.tree-value-array {
    color: var(--text-muted);
}

/* View Container (View Tab) */
.view-container {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.view-card {
    background-color: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 1rem;
}

.view-card-title {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-color);
}

.view-row {
    display: flex;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border-color);
}

.view-row:last-child {
    border-bottom: none;
}

.view-key {
    flex: 0 0 40%;
    font-weight: 500;
    color: var(--syntax-key);
}

.view-value {
    flex: 1;
    color: var(--text-primary);
    word-break: break-word;
}

.view-value.view-null {
    color: var(--syntax-null);
    font-style: italic;
}

.view-value.view-boolean {
    color: var(--syntax-boolean);
}

.view-value.view-number {
    color: var(--syntax-number);
}

.view-value.view-nested {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    white-space: pre-wrap;
    color: var(--text-secondary);
}

.view-value.view-empty-inline {
    color: var(--text-muted);
    font-style: italic;
}

.view-empty {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
    min-height: 200px;
    color: var(--text-muted);
    font-style: italic;
}

/* Error Message */
.error-message {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
    min-height: 200px;
    color: var(--text-muted);
    font-size: 0.9rem;
    text-align: center;
}


/* Responsive Layout - Mobile */
@media (max-width: 768px) {
    .main-container {
        flex-direction: column;
    }
    
    .panel {
        min-height: auto;
    }
    
    .input-panel .panel-content {
        min-height: 250px;
    }
    
    .json-textarea {
        min-height: 200px;
    }
    
    .tab-navigation {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }
    
    .tab-btn {
        padding: 0.6rem 1rem;
        white-space: nowrap;
    }
    
    .header h1 {
        font-size: 1.5rem;
    }
}

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

::-webkit-scrollbar-track {
    background: var(--bg-tertiary);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb {
    background: var(--border-light);
    border-radius: 4px;
}

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

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