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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: #f5f5f5;
    color: #333;
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

h1 {
    text-align: center;
    color: #2c3e50;
    margin-bottom: 30px;
    font-size: 2.5rem;
}

h2 {
    color: #34495e;
    margin-bottom: 15px;
    font-size: 1.3rem;
}

.input-section-wrapper {
    margin-bottom: 20px;
}

.toggle-button {
    display: block;
    width: 100%;
    padding: 10px;
    background-color: #f0f0f0;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 14px;
    cursor: pointer;
    text-align: left;
    margin-bottom: 10px;
}

.toggle-button:hover {
    background-color: #e0e0e0;
}

.input-section {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.text-input-wrapper {
    background-color: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

textarea {
    width: 100%;
    height: 200px;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 14px;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    resize: vertical;
}

textarea:focus {
    outline: none;
    border-color: #3498db;
}

.compare-button {
    display: block;
    width: 200px;
    margin: 0 auto 30px;
    padding: 12px 24px;
    background-color: #3498db;
    color: white;
    border: none;
    border-radius: 4px;
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
    transition: background-color 0.3s;
}

.compare-button:hover {
    background-color: #2980b9;
}

.result-section {
    background-color: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.diff-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.diff-panel {
    border: 1px solid #e0e0e0;
    border-radius: 4px;
    overflow: hidden;
}

.diff-panel h3 {
    background-color: #f0f0f0;
    padding: 10px 15px;
    margin: 0;
    font-size: 1rem;
    color: #555;
    border-bottom: 1px solid #e0e0e0;
}

.diff-result {
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 14px;
    line-height: 1.5;
    background-color: #f8f9fa;
    min-height: 150px;
    max-height: 400px;
    overflow-y: auto;
    overflow-x: auto;
}

.diff-line {
    display: flex;
    min-height: 24px;
    border-bottom: 1px solid #e9ecef;
    align-items: stretch;
}

.line-number {
    background-color: #f0f0f0;
    color: #666;
    padding: 0 8px;
    min-width: 40px;
    text-align: right;
    border-right: 1px solid #ddd;
    user-select: none;
    flex-shrink: 0;
}

.line-content {
    padding: 0 10px;
    white-space: pre-wrap;
    word-wrap: break-word;
    flex: 1;
    width: 100%;
    text-align: left;
}

.diff-line.added {
    background-color: #d4edda;
}

.diff-line.deleted {
    background-color: #f8d7da;
}


.diff-line.empty {
    background-color: #f5f5f5;
}

.diff-line.empty .line-number {
    background-color: #e9e9e9;
}

.char-added {
    background-color: #d4edda;
    color: #155724;
}

.char-deleted {
    background-color: #f8d7da;
    color: #721c24;
    text-decoration: line-through;
}

@media (max-width: 768px) {
    .input-section {
        grid-template-columns: 1fr;
    }
    
    .diff-container {
        grid-template-columns: 1fr;
    }
    
    h1 {
        font-size: 2rem;
    }
    
    .compare-button {
        width: 100%;
    }
}