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

:root {
    --primary-color: #3b82f6;
    --primary-hover: #2563eb;
    --secondary-color: #64748b;
    --success-color: #10b981;
    --error-color: #ef4444;
    --warning-color: #f59e0b;
    --background: #0f172a;
    --surface: #1e293b;
    --surface-light: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --border: #475569;
    --code-bg: #1e1e1e;
    --diff-add: #166534;
    --diff-remove: #991b1b;
    --diff-add-bg: rgba(34, 197, 94, 0.1);
    --diff-remove-bg: rgba(239, 68, 68, 0.1);
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    color: var(--text-primary);
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 1600px;
    margin: 0 auto;
}

header {
    text-align: center;
    margin-bottom: 30px;
    padding: 20px;
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    background: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* Tab Navigation */
.tab-navigation {
    display: flex;
    gap: 10px;
    margin-bottom: 30px;
    background: var(--surface);
    padding: 10px;
    border-radius: 12px;
    overflow-x: auto;
}

.tab-btn {
    flex: 1;
    min-width: 150px;
    padding: 12px 20px;
    background: transparent;
    color: var(--text-secondary);
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

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

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

.tab-icon {
    font-size: 1.2rem;
}

/* Tab Content */
.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

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

/* Converter Layout */
.converter-container {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 20px;
    margin-bottom: 30px;
}

.editor-panel {
    background: var(--surface);
    border-radius: 12px;
    padding: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
    flex-wrap: wrap;
    gap: 10px;
}

.panel-header h3 {
    color: var(--text-primary);
    font-size: 1.2rem;
}

.panel-controls {
    display: flex;
    gap: 10px;
    align-items: center;
    flex-wrap: wrap;
}

.format-select {
    padding: 8px 12px;
    background: var(--surface-light);
    color: var(--text-primary);
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 0.95rem;
    cursor: pointer;
    font-weight: 600;
}

.format-select:focus {
    outline: none;
    border-color: var(--primary-color);
}

.editor-wrapper {
    position: relative;
    display: flex;
    background: var(--code-bg);
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid var(--border);
    min-height: 400px;
}

.editor-wrapper.large {
    min-height: 600px;
}

.line-numbers {
    padding: 15px 10px;
    background: #161616;
    color: #858585;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 14px;
    line-height: 1.6;
    text-align: right;
    user-select: none;
    border-right: 1px solid #2d2d2d;
    min-width: 50px;
}

.code-editor {
    flex: 1;
    padding: 15px;
    background: var(--code-bg);
    color: #d4d4d4;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 14px;
    line-height: 1.6;
    border: none;
    outline: none;
    resize: none;
    white-space: pre;
    overflow: auto;
}

.code-editor::placeholder {
    color: #6a6a6a;
}

.converter-actions {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 10px;
    align-items: center;
}

.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 6px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    white-space: nowrap;
}

.btn-sm {
    padding: 6px 12px;
    font-size: 0.85rem;
}

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

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(59, 130, 246, 0.4);
}

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

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

.btn-convert {
    width: 100%;
}

.convert-icon {
    font-size: 1.5rem;
}

/* Examples Section */
.examples-section {
    background: var(--surface);
    border-radius: 12px;
    padding: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.examples-section h3 {
    margin-bottom: 15px;
}

.examples-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 15px;
}

.example-card {
    background: var(--surface-light);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 15px;
    text-align: left;
    cursor: pointer;
    transition: all 0.3s ease;
}

.example-card:hover {
    background: var(--border);
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(59, 130, 246, 0.3);
    border-color: var(--primary-color);
}

.example-title {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 5px;
}

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

/* Validator Layout */
.validator-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 30px;
}

.validator-left,
.validator-right {
    background: var(--surface);
    border-radius: 12px;
    padding: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.validation-results {
    margin-top: 20px;
}

.validation-results h4 {
    margin-bottom: 10px;
    color: var(--text-primary);
}

.validation-output {
    background: var(--code-bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 15px;
    min-height: 150px;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

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

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

.validation-error {
    margin: 10px 0;
    padding: 10px;
    background: rgba(239, 68, 68, 0.1);
    border-left: 3px solid var(--error-color);
    border-radius: 4px;
}

/* Diff Layout */
.diff-container {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 20px;
    margin-bottom: 30px;
}

.diff-panel {
    background: var(--surface);
    border-radius: 12px;
    padding: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.diff-actions {
    display: flex;
    align-items: center;
}

.diff-results {
    background: var(--surface);
    border-radius: 12px;
    padding: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.diff-stats {
    display: flex;
    gap: 15px;
    font-size: 0.9rem;
}

.diff-stat {
    padding: 5px 10px;
    border-radius: 4px;
    font-weight: 600;
}

.diff-stat.additions {
    background: var(--diff-add-bg);
    color: var(--success-color);
}

.diff-stat.deletions {
    background: var(--diff-remove-bg);
    color: var(--error-color);
}

.diff-output {
    background: var(--code-bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 15px;
    min-height: 300px;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 0.9rem;
    overflow-x: auto;
    margin-top: 15px;
}

.diff-line {
    padding: 2px 5px;
    white-space: pre;
}

.diff-line.added {
    background: var(--diff-add-bg);
    color: var(--success-color);
}

.diff-line.removed {
    background: var(--diff-remove-bg);
    color: var(--error-color);
}

.diff-line.unchanged {
    color: var(--text-secondary);
}

/* Formatter Layout */
.formatter-container {
    margin-bottom: 30px;
}

.formatter-panel {
    background: var(--surface);
    border-radius: 12px;
    padding: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 5px;
    color: var(--text-primary);
    cursor: pointer;
}

.checkbox-label input {
    cursor: pointer;
}

.indent-label {
    display: flex;
    align-items: center;
    gap: 5px;
    color: var(--text-primary);
}

.indent-select {
    padding: 6px 10px;
    background: var(--surface-light);
    color: var(--text-primary);
    border: 1px solid var(--border);
    border-radius: 4px;
    cursor: pointer;
}

/* Footer */
footer {
    text-align: center;
    padding: 30px 20px;
    color: var(--text-secondary);
}

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

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

.footer-note {
    margin-top: 10px;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* Responsive Design */
@media (max-width: 1200px) {
    .converter-container,
    .diff-container {
        grid-template-columns: 1fr;
    }

    .converter-actions,
    .diff-actions {
        flex-direction: row;
        justify-content: center;
    }

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

@media (max-width: 768px) {
    header h1 {
        font-size: 2rem;
    }

    .tab-navigation {
        overflow-x: auto;
    }

    .tab-btn {
        min-width: 120px;
        font-size: 0.9rem;
    }

    .panel-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .panel-controls {
        width: 100%;
    }

    .examples-grid {
        grid-template-columns: 1fr;
    }
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 5px;
}

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