:root {
    /* Primary Palette - Indigo System */
    --primary-50: #eef2ff;
    --primary-100: #e0e7ff;
    --primary-500: #6366f1;
    --primary-600: #4f46e5;
    --primary-700: #4338ca;

    /* Accent - Coral */
    --accent-500: #f43f5e;
    --accent-600: #e11d48;

    /* Semantic Colors */
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;

    /* Neutral Grays */
    --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;

    /* JSON Syntax Colors - Modern Palette */
    --key-color: #ec4899;
    --string-color: #059669;
    --number-color: #7c3aed;
    --boolean-color: #ea580c;
    --null-color: --gray-400;
    --bracket-color: var(--gray-700);

    /* Surface Colors */
    --bg-primary: #ffffff;
    --bg-secondary: var(--gray-50);
    --bg-elevated: #ffffff;
    --border-color: var(--gray-200);

    /* Spacing */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;

    /* Radius */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-xl: 20px;

    /* Shadows - Soft & Subtle */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -1px rgba(0, 0, 0, 0.04);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -2px rgba(0, 0, 0, 0.04);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.08), 0 10px 10px -5px rgba(0, 0, 0, 0.03);
}

/* Modern Font Families */
@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700&family=IBM+Plex+Mono:wght@400;500;600&display=swap');

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--gray-50);
    color: var(--gray-800);
    overflow: hidden;
    height: 100vh;
    display: flex;
    flex-direction: column;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Main Content Wrapper */
.content-wrapper {
    flex: 1;
    padding: var(--space-lg) var(--space-xl);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    gap: var(--space-lg);
    max-width: 1920px;
    margin: 0 auto;
    width: 100%;
}

/* Tool Header */
.tool-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 var(--space-xs);
    position: relative;
    z-index: 100;
}

.tool-title {
    font-size: 22px;
    font-weight: 700;
    color: var(--gray-900);
    letter-spacing: -0.02em;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.tool-title::before {
    content: '{ }';
    font-family: 'IBM Plex Mono', monospace;
    font-size: 20px;
    color: var(--primary-500);
    background: var(--primary-50);
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-sm);
    font-weight: 600;
}

.tool-title span {
    font-size: 13px;
    font-weight: 500;
    color: var(--gray-500);
    background: var(--gray-100);
    padding: 4px 10px;
    border-radius: var(--radius-sm);
    margin-left: var(--space-sm);
}

/* Panel Container */
.panel-container {
    display: flex;
    flex: 1;
    gap: 0;
    min-height: 0;
    background: var(--bg-elevated);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
    overflow: hidden;
}

/* Panels */
.panel {
    background: var(--bg-primary);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.left-panel {
    flex: 1;
    border-right: 1px solid var(--border-color);
}

.right-panel {
    flex: 1.5;
}

/* Panel Headers */
.panel-header {
    background: var(--gray-50);
    color: var(--gray-700);
    padding: var(--space-sm) var(--space-md);
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.03em;
    text-transform: uppercase;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.panel-header.error {
    background: var(--error);
    color: white;
}

/* Header Action Button */
.header-action-btn {
    background: transparent;
    border: none;
    color: var(--gray-400);
    cursor: pointer;
    padding: 4px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.15s ease;
}

.header-action-btn:hover {
    background: var(--gray-200);
    color: var(--primary-600);
}

.header-action-btn:active {
    background: var(--gray-300);
}

/* Editor Area */
.editor-area {
    width: 100%;
    height: 100%;
    border: none;
    padding: var(--space-sm);
    font-family: 'IBM Plex Mono', monospace;
    font-size: 12px;
    resize: none;
    outline: none;
    background: var(--bg-primary);
    color: var(--gray-800);
    line-height: 1.4;
}

.editor-area::placeholder {
    color: var(--gray-400);
}

/* Result Area */
.result-area {
    flex: 1;
    display: flex;
    overflow: hidden;
    background: var(--bg-primary);
}

.parse-col,
.eval-col {
    flex: 1;
    padding: var(--space-sm);
    overflow-y: auto;
    font-family: 'IBM Plex Mono', monospace;
    font-size: 12px;
    line-height: 1.4;
}

.parse-col {
    border-right: 1px solid var(--border-color);
}

/* Resizer Gutter */
.gutter {
    width: 12px;
    margin: 0 -6px;
    cursor: col-resize;
    background: transparent;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: all 0.15s ease;
    flex: 0 0 auto;
    z-index: 10;
    position: relative;
}

.gutter:hover {
    background: var(--primary-50);
}

.gutter::after {
    content: '';
    position: absolute;
    width: 3px;
    height: 40px;
    background: var(--gray-300);
    border-radius: 2px;
    transition: all 0.15s ease;
    left: 50%;
    transform: translateX(-50%);
}

.gutter:hover::after {
    background: var(--primary-500);
    height: 60px;
}

/* JSON Tree Styles */
.json-tree {
    line-height: 1.4;
    list-style: none;
    padding-left: var(--space-md);
    margin: 0;
    animation: slideDown 0.2s ease-out;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-8px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.json-tree li {
    position: relative;
    white-space: pre-wrap;
    word-break: break-all;
}

/* Toggle Button */
.json-toggle {
    cursor: pointer;
    font-weight: 600;
    color: var(--gray-500);
    user-select: none;
    margin-right: var(--space-xs);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 12px;
    height: 12px;
    line-height: 1;
    border: 1px solid var(--gray-300);
    border-radius: 3px;
    font-size: 9px;
    transition: all 0.15s ease;
    background: var(--bg-primary);
}

.json-toggle:hover {
    color: var(--primary-600);
    border-color: var(--primary-500);
    background: var(--primary-50);
    transform: scale(1.05);
}

/* Syntax Highlighting */
.json-key {
    color: var(--key-color);
    font-weight: 500;
}

/* Rainbow Key Colors (Soft Palette) */
.json-key-0 {
    color: #ef4444;
}

/* Red */
.json-key-1 {
    color: #f97316;
}

/* Orange */
.json-key-2 {
    color: #d97706;
}

/* Amber */
.json-key-3 {
    color: #84cc16;
}

/* Lime */
.json-key-4 {
    color: #10b981;
}

/* Emerald */
.json-key-5 {
    color: #06b6d4;
}

/* Cyan */
.json-key-6 {
    color: #3b82f6;
}

/* Blue */
.json-key-7 {
    color: #8b5cf6;
}

/* Violet */
.json-key-8 {
    color: #d946ef;
}

/* Fuchsia */

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

.json-number {
    color: var(--number-color);
    font-weight: 500;
}

.json-boolean {
    color: var(--boolean-color);
    font-weight: 600;
}

.json-null {
    color: var(--gray-400);
    font-style: italic;
}

.json-bracket {
    color: var(--gray-700);
}

/* Type Indicator */
.json-type {
    color: var(--gray-400);
    font-size: 11px;
    font-weight: 500;
    opacity: 0.4;
    margin-left: 6px;
    font-family: 'Plus Jakarta Sans', sans-serif;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.json-type.type-string {
    color: #10b981;
}

/* Soft Emerald */
.json-type.type-number {
    color: #8b5cf6;
}

/* Soft Violet */
.json-type.type-boolean {
    color: #f59e0b;
}

/* Soft Amber */
.json-type.type-object {
    color: #f43f5e;
}

/* Soft Rose/Coral */
.json-type.type-array {
    color: #3b82f6;
}

/* Soft Blue */
.json-type.type-null {
    color: #9ca3af;
}

/* Soft Gray */

.folded {
    display: none;
}

.json-size-indicator {
    color: var(--primary-600);
    font-size: 11px;
    font-weight: 600;
    padding: 0 var(--space-xs);
    font-family: 'Plus Jakarta Sans', sans-serif;
}

/* Footer */
footer {
    background: var(--gray-900);
    color: var(--gray-500);
    text-align: center;
    padding: var(--space-sm);
    font-size: 12px;
    border-top: 1px solid var(--gray-800);
    font-weight: 500;
}

/* Options Dropdown */
.options-dropdown {
    position: relative;
    cursor: pointer;
    background: var(--bg-primary);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    font-size: 13px;
    font-weight: 600;
    transition: all 0.15s ease;
    user-select: none;
    color: var(--gray-700);
    box-shadow: var(--shadow-sm);
    display: flex;
    align-items: center;
}

.options-dropdown:hover {
    border-color: var(--primary-500);
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

.options-dropdown.active {
    border-color: var(--primary-500);
    box-shadow: var(--shadow-md);
    background: var(--primary-50);
}

.options-dropdown.active svg {
    transform: rotate(180deg);
}

.options-content {
    display: none;
    position: absolute;
    right: 0;
    top: calc(100% + 8px);
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-xl);
    z-index: 1000;
    width: 200px;
    overflow: visible;
    padding-bottom: var(--space-xs);
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-4px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.option-item {
    color: var(--gray-700);
    padding: var(--space-md) var(--space-md);
    font-size: 13px;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    cursor: pointer;
    transition: all 0.1s ease;
    font-weight: 500;
    border-bottom: 1px solid var(--gray-100);
    position: relative;
}

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

.option-item:hover {
    background: var(--primary-50);
    color: var(--primary-700);
}

.option-item input {
    width: 16px;
    height: 16px;
    cursor: pointer;
    accent-color: var(--primary-600);
    flex-shrink: 0;
    position: relative;
    z-index: 1;
}

/* Custom Scrollbar - Modern Style */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--gray-300);
    border-radius: var(--radius-sm);
    transition: background 0.15s ease;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--gray-400);
}

/* Error States */
.error {
    animation: shake 0.4s ease;
}

@keyframes shake {

    0%,
    100% {
        transform: translateX(0);
    }

    25% {
        transform: translateX(-4px);
    }

    75% {
        transform: translateX(4px);
    }
}

/* Responsive */
@media (max-width: 768px) {
    .content-wrapper {
        padding: var(--space-md);
    }

    .tool-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-md);
    }

    .tool-title {
        font-size: 18px;
    }

    .panel-container {
        flex-direction: column;
    }

    .left-panel,
    .right-panel {
        flex: 1;
        min-height: 300px;
    }

    .gutter {
        display: none;
    }

    .parse-col {
        border-right: none;
        border-bottom: 1px solid var(--border-color);
    }
}