/* CSS Variables for theming */
:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f5f5f5;
    --bg-tertiary: #e8e8e8;
    --text-primary: #1a1a1a;
    --text-secondary: #666666;
    --border-color: #ddd;
    --accent-color: #007acc;
    --accent-hover: #005a9e;
    --error-color: #dc3545;
    --success-color: #28a745;
    --warning-color: #ffc107;

    /* Syntax highlighting - light mode */
    --syn-string: #a31515;
    --syn-number: #098658;
    --syn-boolean: #0000ff;
    --syn-null: #808080;
    --syn-key: #0451a5;
    --syn-bracket: #333;
}

[data-theme="dark"] {
    --bg-primary: #1e1e1e;
    --bg-secondary: #252526;
    --bg-tertiary: #333333;
    --text-primary: #d4d4d4;
    --text-secondary: #9d9d9d;
    --border-color: #404040;
    --accent-color: #4fc3f7;
    --accent-hover: #29b6f6;

    /* Syntax highlighting - dark mode */
    --syn-string: #ce9178;
    --syn-number: #b5cea8;
    --syn-boolean: #569cd6;
    --syn-null: #808080;
    --syn-key: #9cdcfe;
    --syn-bracket: #d4d4d4;
}

/* Reset and base */
*, *::before, *::after {
    box-sizing: border-box;
}

body {
    margin: 0;
    padding: 0;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.5;
}

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

.app-container > header,
.app-container > main,
.app-container > article,
.app-container > footer {
    width: 100%;
}

/* Header */
.header {
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    padding: 0.75rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header-brand {
    display: flex;
    flex-direction: column;
    gap: 0.125rem;
}

.header h1 {
    margin: 0;
    font-size: 1.5rem;
    font-weight: 600;
    line-height: 1.2;
}

.header-subtitle {
    font-weight: 400;
    color: var(--text-secondary);
}

.header-tagline {
    margin: 0;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

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

/* Main content */
.main-content {
    display: grid;
    grid-template-columns: 1fr 250px;
    padding: 1rem;
    gap: 1rem;
    min-height: 70vh;
}

.tool-section {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    overflow: hidden;
}

/* Toolbar */
.toolbar {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    align-items: center;
    padding: 0.75rem;
    background: var(--bg-primary);
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.toolbar-group {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

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

.convert-toolbar {
    display: flex;
    gap: 0.5rem;
    align-items: center;
    padding: 0.5rem 0.75rem;
    background: var(--bg-primary);
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

/* View toggle */
.view-toggle {
    display: flex;
    gap: 0;
}

.btn-tab {
    border-radius: 0;
    border: 1px solid var(--border-color);
}

.btn-tab:first-child {
    border-radius: 6px 0 0 6px;
}

.btn-tab:last-child {
    border-radius: 0 6px 6px 0;
    border-left: none;
}

.btn-tab.active {
    background: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
}

/* Buttons */
.btn {
    padding: 0.5rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: var(--bg-primary);
    color: var(--text-primary);
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 500;
    transition: all 0.15s ease;
}

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

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

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

.btn-danger {
    color: var(--error-color);
    border-color: var(--error-color);
}

.btn-danger:hover {
    background: var(--error-color);
    color: white;
}

.btn-small {
    padding: 0.25rem 0.5rem;
    font-size: 0.75rem;
}

.btn-icon {
    padding: 0.5rem;
    font-size: 1.25rem;
    line-height: 1;
}

.select {
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 0.875rem;
    cursor: pointer;
}

/* Theme toggle */
[data-theme="dark"] .icon-sun {
    display: none;
}

[data-theme="dark"] .icon-moon {
    display: inline;
}

.icon-moon {
    display: none;
}

/* Editor container */
.editor-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    flex: 1;
    min-height: 0;
}

.editor-panel {
    display: flex;
    flex-direction: column;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
    min-height: 0;
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 1rem;
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-color);
    font-weight: 500;
    font-size: 0.875rem;
}

.status {
    font-size: 0.75rem;
    padding: 0.125rem 0.5rem;
    border-radius: 4px;
}

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

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

/* Input area */
.input-wrapper {
    position: relative;
    display: flex;
    flex: 1;
    min-height: 0;
    overflow: hidden;
}


#json-input {
    flex: 1;
    width: 100%;
    height: 100%;
    min-width: 0;
    padding: 0.75rem;
    border: none;
    background: var(--bg-primary);
    color: var(--text-primary);
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 0.875rem;
    line-height: 1.5;
    resize: none;
    outline: none;
    overflow: auto;
}

#json-input::placeholder {
    color: var(--text-secondary);
}

/* Drop zone */
.drop-overlay {
    position: absolute;
    inset: 0;
    background: rgba(79, 195, 247, 0.15);
    border: 2px dashed var(--accent-color);
    display: none;
    justify-content: center;
    align-items: center;
    font-size: 1.25rem;
    color: var(--accent-color);
    font-weight: 500;
    pointer-events: none;
}

.input-wrapper.dragover .drop-overlay {
    display: flex;
}

/* Output area */
.output-wrapper {
    flex: 1;
    overflow: auto;
}

.json-output {
    margin: 0;
    padding: 0.75rem;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 0.875rem;
    line-height: 1.5;
    white-space: pre-wrap;
    word-wrap: break-word;
}

/* Syntax highlighting classes */
.json-string { color: var(--syn-string); }
.json-number { color: var(--syn-number); }
.json-boolean { color: var(--syn-boolean); }
.json-null { color: var(--syn-null); }
.json-key { color: var(--syn-key); }
.json-bracket { color: var(--syn-bracket); }

/* Tree view */
.tree-container {
    flex: 1;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.tree-toolbar {
    display: flex;
    gap: 0.5rem;
    padding: 0.5rem;
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-color);
    align-items: center;
}

.tree-path {
    margin-left: auto;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 0.75rem;
    color: var(--text-secondary);
    padding: 0.25rem 0.5rem;
    background: var(--bg-primary);
    border-radius: 4px;
}

.tree-view {
    flex: 1;
    overflow: auto;
    padding: 0.5rem;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 0.875rem;
}

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

.tree-item {
    display: flex;
    align-items: flex-start;
    padding: 0.125rem 0;
    cursor: pointer;
}

.tree-item:hover {
    background: var(--bg-tertiary);
    border-radius: 4px;
}

.tree-toggle {
    width: 1rem;
    text-align: center;
    color: var(--text-secondary);
    flex-shrink: 0;
}

.tree-key {
    color: var(--syn-key);
    margin-right: 0.25rem;
}

.tree-value {
    color: var(--text-primary);
}

.tree-value.string { color: var(--syn-string); }
.tree-value.number { color: var(--syn-number); }
.tree-value.boolean { color: var(--syn-boolean); }
.tree-value.null { color: var(--syn-null); }

.tree-bracket {
    color: var(--syn-bracket);
}

.tree-count {
    color: var(--text-secondary);
    font-size: 0.75rem;
    margin-left: 0.25rem;
}

.tree-children {
    display: block;
}

.tree-children.collapsed {
    display: none;
}

/* Error panel */
.error-panel {
    background: #fff5f5;
    border: 1px solid var(--error-color);
    border-radius: 8px;
    overflow: hidden;
}

[data-theme="dark"] .error-panel {
    background: #3d1f1f;
}

.error-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--error-color);
    color: white;
    font-weight: 500;
}

.error-message {
    padding: 0.75rem 1rem;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 0.875rem;
    color: var(--error-color);
}

/* Sidebar */
.sidebar {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1rem;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    height: fit-content;
    max-height: calc(100vh - 200px);
}

.history-panel {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 0;
}

.history-panel .panel-header {
    margin: -1rem -1rem 0.75rem -1rem;
    padding: 0.75rem 1rem;
}

.history-list {
    list-style: none;
    margin: 0;
    padding: 0;
    overflow-y: auto;
    flex: 1;
}

.history-item {
    padding: 0.5rem;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.8rem;
    border: 1px solid transparent;
    margin-bottom: 0.5rem;
    background: var(--bg-secondary);
}

.history-item:hover {
    border-color: var(--accent-color);
}

.history-item-preview {
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    font-size: 0.75rem;
    margin-top: 0.25rem;
}

.history-item-time {
    color: var(--text-secondary);
    font-size: 0.7rem;
}

/* Toast notification */
.toast {
    position: fixed;
    bottom: 1rem;
    right: 1rem;
    padding: 0.75rem 1.5rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    transform: translateY(100px);
    opacity: 0;
    transition: all 0.3s ease;
    z-index: 1000;
}

.toast.show {
    transform: translateY(0);
    opacity: 1;
}

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

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

/* Ad Container */
.ad-container {
    padding: 1rem 1.5rem;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    text-align: center;
    min-height: 100px;
}

/* SEO Content Section */
.seo-content {
    background: var(--bg-primary);
    border-top: 1px solid var(--border-color);
    padding: 3rem 1.5rem;
}

.content-section {
    max-width: 800px;
    margin: 0 auto 2.5rem auto;
}

.content-section:last-child {
    margin-bottom: 0;
}

.content-section h2 {
    font-size: 1.5rem;
    margin: 0 0 1rem 0;
    color: var(--text-primary);
}

.content-section h3 {
    font-size: 1.125rem;
    margin: 1.5rem 0 0.75rem 0;
    color: var(--text-primary);
}

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

.content-section ul,
.content-section ol {
    margin: 0 0 1rem 0;
    padding-left: 1.5rem;
    color: var(--text-secondary);
}

.content-section li {
    margin-bottom: 0.5rem;
}

.content-section code {
    background: var(--bg-tertiary);
    padding: 0.125rem 0.375rem;
    border-radius: 4px;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 0.875em;
}

.feature-list li {
    margin-bottom: 0.75rem;
}

.how-to-list li {
    margin-bottom: 1rem;
}

/* FAQ Section */
.faq-section {
    margin-top: 2rem;
}

.faq-item {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    margin-bottom: 0.75rem;
    overflow: hidden;
}

.faq-item summary {
    padding: 1rem;
    cursor: pointer;
    list-style: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.faq-item summary::-webkit-details-marker {
    display: none;
}

.faq-item summary::before {
    content: '▶';
    font-size: 0.75rem;
    color: var(--text-secondary);
    transition: transform 0.2s ease;
}

.faq-item[open] summary::before {
    transform: rotate(90deg);
}

.faq-item summary h3 {
    margin: 0;
    font-size: 1rem;
    font-weight: 500;
}

.faq-item > p {
    padding: 0 1rem 1rem 1rem;
    margin: 0;
}

/* Footer */
.footer {
    background: var(--bg-primary);
    border-top: 1px solid var(--border-color);
    padding: 1.5rem;
    text-align: center;
}

.footer-content {
    max-width: 800px;
    margin: 0 auto;
}

.footer p {
    margin: 0 0 0.5rem 0;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.footer a {
    color: var(--accent-color);
    text-decoration: none;
}

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

.footer-links {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
}

/* Responsive */
@media (max-width: 1024px) {
    .main-content {
        grid-template-columns: 1fr;
    }

    .sidebar {
        max-height: 200px;
    }

    .editor-container {
        grid-template-columns: 1fr;
        grid-template-rows: 1fr 1fr;
    }

    .header {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }

    .header-controls {
        align-self: flex-end;
        margin-top: -2rem;
    }
}

@media (max-width: 640px) {
    .toolbar {
        flex-direction: column;
        align-items: stretch;
    }

    .toolbar-group {
        justify-content: center;
    }

    .header-controls {
        margin-top: 0;
        align-self: flex-start;
    }

    .seo-content {
        padding: 2rem 1rem;
    }

    .content-section h2 {
        font-size: 1.25rem;
    }
}