:root {
    --primary-color: #4f46e5;
    --secondary-color: #64748b;
    --accent-color: #06b6d4;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --light-bg: #f8fafc;
    --dark-bg: #0f172a;
    --card-bg: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --border-radius: 8px;
    --transition: all 0.3s ease;
    
    /* JSON Syntax Colors */
    --json-key: #0066cc;
    --json-string: #22863a;
    --json-number: #005cc5;
    --json-boolean: #6f42c1;
    --json-null: #d73a49;
    --json-bracket: #24292e;
}

body.dark-mode {
    --light-bg: #0f172a;
    --dark-bg: #1e293b;
    --card-bg: #1e293b;
    --text-primary: #e2e8f0;
    --text-secondary: #94a3b8;
    --border-color: #334155;
    
    /* Dark mode JSON colors */
    --json-key: #79b8ff;
    --json-string: #85e89d;
    --json-number: #79b8ff;
    --json-boolean: #b392f0;
    --json-null: #f97583;
    --json-bracket: #e1e4e8;
}

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

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

/* Navigation */
nav {
    background-color: var(--card-bg);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 1.5rem;
    align-items: center;
}

.nav-link {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    transition: var(--transition);
}

.nav-link:hover {
    color: var(--primary-color);
}

.dark-mode-toggle {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 50%;
    transition: var(--transition);
}

.dark-mode-toggle:hover {
    background-color: var(--light-bg);
}

/* Container */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
}

.page-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.page-subtitle {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

/* Tool Container */
.tool-container {
    background-color: var(--card-bg);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    overflow: hidden;
}

/* Toolbar */
.tool-toolbar {
    background-color: var(--light-bg);
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    align-items: center;
}

.toolbar-btn {
    padding: 0.5rem 1rem;
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    color: var(--text-primary);
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 500;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

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

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

.toolbar-btn.primary:hover {
    background-color: #4338ca;
}

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

.toolbar-divider {
    width: 1px;
    height: 24px;
    background-color: var(--border-color);
    margin: 0 0.5rem;
}

/* View Mode Tabs */
.view-tabs {
    display: flex;
    gap: 0.5rem;
}

.view-tab {
    padding: 0.5rem 1rem;
    background-color: transparent;
    border: 1px solid transparent;
    border-radius: var(--border-radius);
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 500;
    transition: var(--transition);
}

.view-tab.active {
    background-color: var(--card-bg);
    border-color: var(--border-color);
    color: var(--primary-color);
}

/* Content Area */
.tool-content {
    padding: 1rem;
    min-height: 600px;
}

/* Message */
#messageContainer {
    margin-bottom: 1rem;
}

.error-message,
.success-message,
.warning-message {
    padding: 0.75rem 1rem;
    border-radius: var(--border-radius);
    font-size: 0.875rem;
    border-left: 4px solid;
    animation: slideIn 0.3s ease;
}

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

.error-message {
    background-color: rgba(239, 68, 68, 0.1);
    color: var(--danger-color);
    border-color: var(--danger-color);
}

.success-message {
    background-color: rgba(16, 185, 129, 0.1);
    color: var(--success-color);
    border-color: var(--success-color);
}

.warning-message {
    background-color: rgba(245, 158, 11, 0.1);
    color: var(--warning-color);
    border-color: var(--warning-color);
}

/* Text Editor Mode */
.text-editor-container {
    display: none;
}

.text-editor-container.active {
    display: block;
}

.editor-wrapper {
    position: relative;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    overflow: hidden;
}

.editor-line-numbers {
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 50px;
    background-color: var(--light-bg);
    border-right: 1px solid var(--border-color);
    padding: 1rem 0.5rem;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.875rem;
    line-height: 1.6;
    color: var(--text-secondary);
    text-align: right;
    user-select: none;
    overflow: hidden;
}

#textEditor {
    width: 100%;
    min-height: 600px;
    padding: 1rem 1rem 1rem 60px;
    border: none;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.875rem;
    line-height: 1.6;
    resize: vertical;
    background-color: var(--card-bg);
    color: var(--text-primary);
    outline: none;
}

#highlightedCode {
    position: absolute;
    left: 60px;
    top: 1rem;
    right: 1rem;
    bottom: 1rem;
    pointer-events: none;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.875rem;
    line-height: 1.6;
    white-space: pre-wrap;
    word-wrap: break-word;
    overflow: hidden;
}

/* Tree View Mode */
.tree-view-container {
    display: none;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 1rem;
    min-height: 600px;
    max-height: 600px;
    overflow: auto;
    background-color: var(--card-bg);
}

.tree-view-container.active {
    display: block;
}

.tree-node {
    margin-left: 20px;
}

.tree-line {
    display: flex;
    align-items: flex-start;
    padding: 2px 0;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.875rem;
    line-height: 1.6;
}

.tree-toggle {
    width: 20px;
    height: 20px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    user-select: none;
    color: var(--text-secondary);
    flex-shrink: 0;
}

.tree-toggle:hover {
    color: var(--primary-color);
}

.tree-toggle.collapsed::before {
    content: '▶';
}

.tree-toggle.expanded::before {
    content: '▼';
}

.tree-key {
    color: var(--json-key);
    margin-right: 0.5rem;
    cursor: pointer;
}

.tree-key:hover {
    text-decoration: underline;
}

.tree-value {
    flex: 1;
}

.tree-value.editable {
    cursor: pointer;
    padding: 2px 4px;
    border-radius: 3px;
    transition: var(--transition);
}

.tree-value.editable:hover {
    background-color: var(--light-bg);
}

.tree-value-input {
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.875rem;
    padding: 2px 4px;
    border: 1px solid var(--primary-color);
    border-radius: 3px;
    background-color: var(--card-bg);
    color: var(--text-primary);
    outline: none;
    min-width: 100px;
}

.json-string { color: var(--json-string); }
.json-number { color: var(--json-number); }
.json-boolean { color: var(--json-boolean); }
.json-null { color: var(--json-null); }
.json-bracket { color: var(--json-bracket); }

.tree-type-badge {
    display: inline-block;
    padding: 2px 6px;
    border-radius: 3px;
    font-size: 0.75rem;
    margin-left: 0.5rem;
    color: var(--text-secondary);
    background-color: var(--light-bg);
}

/* Search Box */
.search-container {
    margin-bottom: 1rem;
    display: none;
}

.search-container.active {
    display: block;
}

.search-box {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

#searchInput {
    flex: 1;
    padding: 0.5rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 0.875rem;
    background-color: var(--card-bg);
    color: var(--text-primary);
}

#searchInput:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.search-results {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* File Input (hidden) */
#fileInput {
    display: none;
}

/* Responsive */
@media (max-width: 768px) {
    .nav-links {
        gap: 1rem;
    }

    .nav-link {
        font-size: 0.875rem;
    }

    .page-title {
        font-size: 1.5rem;
    }

    .toolbar-btn {
        padding: 0.4rem 0.8rem;
        font-size: 0.8rem;
    }

    #textEditor {
        min-height: 400px;
    }

    .tree-view-container {
        min-height: 400px;
        max-height: 400px;
    }
}

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

::-webkit-scrollbar-track {
    background: var(--light-bg);
}

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

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