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

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

.container {
    max-width: 1600px;
    margin: 0 auto;
    background: white;
    border-radius: 10px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    overflow: hidden;
}

header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 20px 30px;
    text-align: center;
}

header h1 {
    font-size: 2.5em;
    margin-bottom: 5px;
}

header p {
    opacity: 0.9;
    font-size: 1.1em;
}

.main-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    padding: 20px;
}

.editor-section {
    display: flex;
    flex-direction: column;
}

.output-panel {
    margin-top: 15px;
    min-height: 150px;
    max-height: 300px;
}

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

.examples-section {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 10px;
    padding: 10px;
    background: #f0f0f0;
    border-radius: 5px;
}

.examples-section label {
    font-weight: 600;
    color: #333;
}

.examples-section select {
    flex: 1;
    padding: 8px;
    border: 2px solid #ddd;
    border-radius: 5px;
    font-size: 0.9em;
    background: white;
    cursor: pointer;
}

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

.editor-header h2 {
    color: #333;
    font-size: 1.5em;
}

.button-group {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

button {
    padding: 8px 16px;
    background: #667eea;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 0.9em;
    transition: background 0.3s;
}

button:hover {
    background: #5568d3;
}

button:active {
    transform: scale(0.98);
}

button:disabled {
    background: #ccc;
    cursor: not-allowed;
}

#source {
    width: 100%;
    height: 400px;
    padding: 15px;
    border: 2px solid #ddd;
    border-radius: 5px;
    font-family: 'Fira Code', 'Courier New', monospace;
    font-size: 14px;
    resize: vertical;
    background: #f8f9fa;
}

#source:focus {
    outline: none;
    border-color: #667eea;
}

.panels-section {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}

.panel {
    background: #f8f9fa;
    border: 1px solid #ddd;
    border-radius: 5px;
    padding: 15px;
    min-height: 200px;
    display: flex;
    flex-direction: column;
}

.panel h3 {
    color: #333;
    margin-bottom: 10px;
    font-size: 1.1em;
    border-bottom: 2px solid #667eea;
    padding-bottom: 5px;
}

.panel pre {
    flex: 1;
    background: white;
    padding: 10px;
    border-radius: 3px;
    overflow-y: auto;
    overflow-x: auto;
    font-family: 'Fira Code', 'Courier New', monospace;
    font-size: 12px;
    white-space: pre-wrap;
    word-wrap: break-word;
    max-height: 400px;
    min-height: 200px;
    border: 1px solid #e0e0e0;
    scrollbar-width: thin;
    scrollbar-color: #667eea #f0f0f0;
}

.panel pre::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

.panel pre::-webkit-scrollbar-track {
    background: #f0f0f0;
    border-radius: 4px;
}

.panel pre::-webkit-scrollbar-thumb {
    background: #667eea;
    border-radius: 4px;
}

.panel pre::-webkit-scrollbar-thumb:hover {
    background: #5568d3;
}

#tokensView, #astView, #semanticView, #cppView, #outputView {
    color: #333;
}

#outputView {
    background: #1e1e1e;
    color: #d4d4d4;
}

@media (max-width: 1200px) {
    .main-content {
        grid-template-columns: 1fr;
    }
    
    .panels-section {
        grid-template-columns: 1fr;
    }
}

.status-success {
    color: #28a745;
}

.status-error {
    color: #dc3545;
}

.status-info {
    color: #17a2b8;
}


/* error text must win over the panel's own text color */
.panel pre.status-error {
    color: #dc3545;
}

#outputView.status-error {
    color: #ff7b72;
}

.header-links {
    margin-top: 8px;
}

.header-links a {
    color: white;
    font-weight: 600;
}

.stage {
    float: right;
    font-size: 0.75em;
    font-weight: normal;
    color: #667eea;
}

.hint {
    margin-top: 6px;
    font-size: 0.85em;
    color: #666;
}

kbd {
    padding: 1px 6px;
    border: 1px solid #ccc;
    border-radius: 3px;
    background: #f0f0f0;
    font-family: inherit;
}

#runBtn {
    padding: 10px 28px;
    font-size: 1em;
    font-weight: 600;
}

@media (max-width: 600px) {
    body {
        padding: 8px;
    }

    header h1 {
        font-size: 1.8em;
    }

    .main-content {
        padding: 12px;
    }

    .examples-section {
        flex-direction: column;
        align-items: stretch;
    }

    .stage {
        display: none;
    }

    #source {
        height: 240px;
    }
}