* {
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background: #f5f5f5;
    color: #333;
}

.header {
    text-align: center;
    padding: 20px;
    background: #222;
    color: #fff;
}

.container {
    max-width: 1100px;
    margin: 20px auto;
    padding: 10px;
}

.input-section {
    display: flex;
    gap: 10px;
    padding-bottom: 20px;
    border-bottom: 2px solid #e0e0e0;
}

textarea {
    width: 50%;
    height: 220px;
    padding: 10px;
    font-size: 14px;
    resize: vertical;
}

button {
    margin: 20px 0;
    padding: 10px 20px;
    font-size: 16px;
    cursor: pointer;
}

.result-section {
    background: #fff;
    padding: 15px;
    border-radius: 4px;
}

#result {
    white-space: pre-wrap;
    font-family: monospace;
}

.footer {
    text-align: center;
    padding: 15px;
    font-size: 14px;
    color: #666;
}

.added {
    background-color: #c6f6c2;
    color: #1a5a1a;
    padding: 2px 4px;
    border-radius: 2px;
}

.removed {
    background-color: #ffd1d8;
    color: #8b0000;
    padding: 2px 4px;
    border-radius: 2px;
    text-decoration: line-through;
}

.controls {
    margin: 20px 0 10px 0;
    padding-bottom: 20px;
    display: flex;
    gap: 15px;
    border-bottom: 2px solid #e0e0e0;
}

.actions {
    margin: 20px 0;
    padding-bottom: 20px;
    display: flex;
    gap: 10px;
    border-bottom: 2px solid #e0e0e0;
}

.side-by-side {
    display: flex;
    gap: 15px;
}

.result-box {
    width: 50%;
    background: #fff;
    padding: 15px;
    border-radius: 6px;
    border: 1px solid #e0e0e0;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.result-box-left {
    border-left: 4px solid #5b9bd5;
}

.result-box-right {
    border-left: 4px solid #70ad47;
}

.result-header {
    margin: 0 0 15px 0;
    font-size: 14px;
    font-weight: 600;
    color: #555;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.result {
    white-space: pre-wrap;
    font-family: monospace;
    min-height: 150px;
}