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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    background: white;
    border-radius: 12px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    padding: 30px;
}

header {
    text-align: center;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 2px solid #e0e0e0;
}

h1 {
    color: #2d3748;
    font-size: 2.5rem;
    margin-bottom: 10px;
}

.subtitle {
    color: #718096;
    font-size: 1.1rem;
}

.playground-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-template-rows: auto auto;
    gap: 20px;
    margin-bottom: 20px;
}

.panel {
    background: #f7fafc;
    border: 2px solid #e2e8f0;
    border-radius: 8px;
    padding: 20px;
}

.input-panel {
    grid-column: 1 / 2;
    grid-row: 1 / 3;
}

.output-panel {
    grid-column: 2 / 3;
    grid-row: 1 / 2;
}

.ast-panel {
    grid-column: 2 / 3;
    grid-row: 2 / 3;
}

.panel h2 {
    color: #2d3748;
    font-size: 1.2rem;
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 2px solid #cbd5e0;
}

.code-editor {
    width: 100%;
    height: 500px;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 14px;
    padding: 15px;
    border: 1px solid #cbd5e0;
    border-radius: 4px;
    resize: vertical;
    background: white;
    color: #2d3748;
    line-height: 1.6;
}

.code-editor:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

/* CodeMirror editor styles */
.cm-editor {
    width: 100%;
    height: 500px;
    border: 1px solid #cbd5e0;
    border-radius: 4px;
    overflow: hidden;
}

.cm-editor.cm-focused {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.cm-scroller {
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
}

.code-display {
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 13px;
    padding: 15px;
    background: white;
    border: 1px solid #cbd5e0;
    border-radius: 4px;
    overflow: auto;
    max-height: 400px;
    color: #2d3748;
    line-height: 1.6;
    white-space: pre-wrap;
    word-wrap: break-word;
}

#ast-output {
    max-height: 300px;
    overflow-y: auto;
    overflow-x: auto;
}

.controls {
    display: flex;
    gap: 15px;
    align-items: center;
    margin-bottom: 20px;
    padding: 20px;
    background: #f7fafc;
    border-radius: 8px;
}

.btn {
    padding: 12px 24px;
    font-size: 16px;
    font-weight: 600;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
    background: #e2e8f0;
    color: #2d3748;
}

.btn-secondary:hover {
    background: #cbd5e0;
}

.transform-select {
    padding: 10px 15px;
    font-size: 14px;
    border: 2px solid #e2e8f0;
    border-radius: 6px;
    background: white;
    color: #2d3748;
    cursor: pointer;
    flex: 1;
    max-width: 300px;
}

.transform-select:focus {
    outline: none;
    border-color: #667eea;
}

.info-panel {
    background: #edf2f7;
    padding: 20px;
    border-radius: 8px;
    border-left: 4px solid #667eea;
}

.info-panel h3 {
    color: #2d3748;
    margin-bottom: 10px;
}

.info-panel p {
    color: #4a5568;
    margin-bottom: 10px;
}

.info-panel ul {
    list-style-position: inside;
    color: #4a5568;
}

.info-panel li {
    margin-bottom: 5px;
}

@media (max-width: 1024px) {
    .playground-layout {
        grid-template-columns: 1fr;
        grid-template-rows: auto auto auto;
    }

    .input-panel,
    .output-panel,
    .ast-panel {
        grid-column: 1 / 2;
    }

    .input-panel {
        grid-row: 1 / 2;
    }

    .output-panel {
        grid-row: 2 / 3;
    }

    .ast-panel {
        grid-row: 3 / 4;
    }

    .code-editor {
        height: 300px;
    }
}