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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    background-color: #f5f5f5;
    padding: 20px;
}

.container {
    display: flex;
    gap: 20px;
    max-width: 1200px;
    margin: 0 auto;
    height: calc(100vh - 40px);
}

.panel {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.panel-header {
    background-color: #2c3e50;
    color: white;
    padding: 10px 15px;
    font-weight: bold;
    border-radius: 5px 5px 0 0;
}

.input-area {
    flex: 1;
    padding: 15px;
    border: 1px solid #ddd;
    border-top: none;
    background-color: white;
    resize: none;
    font-family: inherit;
    font-size: 14px;
    line-height: 1.5;
    border-radius: 0 0 0 5px;
}

.output-area {
    flex: 1;
    padding: 15px;
    border: 1px solid #ddd;
    border-top: none;
    background-color: #282c34;
    color: #abb2bf;
    font-family: 'Courier New', Courier, monospace;
    font-size: 14px;
    line-height: 1.5;
    white-space: pre;
    overflow: auto;
    border-radius: 0 0 5px 0;
}

@media (max-width: 768px) {
    .container {
        flex-direction: column;
        height: auto;
    }
    .input-area, .output-area {
        min-height: 300px;
    }
}