body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f5f5f5;
    margin: 0;
    padding: 20px;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    min-height: 100vh;
}

main {
    background-color: white;
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    max-width: 700px;
    width: 100%;
}

h1 {
    color: #333;
    margin-top: 0;
    margin-bottom: 25px;
    font-size: 24px;
    text-align: center;
    border-bottom: 2px solid #4CAF50;
    padding-bottom: 10px;
}

.input-group {
    display: grid;
    grid-template-columns: auto 1fr auto 1fr;
    gap: 10px;
    align-items: center;
    margin-bottom: 15px;
    padding: 12px;
    background-color: #fafafa;
    border-radius: 8px;
}

.input-group label {
    font-weight: 600;
    color: #555;
    min-width: 30px;
}

.input-group input[type="number"] {
    padding: 8px 12px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 14px;
    transition: border-color 0.3s;
}

.input-group input[type="number"]:focus {
    outline: none;
    border-color: #4CAF50;
}

.controls {
    margin-top: 25px;
    padding-top: 20px;
}

.button-group {
    margin-bottom: 15px;
    text-align: center;
}

button {
    background-color: #333;
    color: white;
    border: none;
    padding: 10px 20px;
    font-size: 14px;
    border-radius: 6px;
    cursor: pointer;
    transition: background-color 0.3s;
}

button:hover {
    opacity: 0.8;
}

.checkbox-group {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    margin-top: 15px;
}

.checkbox-group span {
    display: flex;
    align-items: center;
    gap: 5px;
}

.checkbox-group input[type="checkbox"] {
    cursor: pointer;
    width: 16px;
    height: 16px;
}

.checkbox-group label {
    cursor: pointer;
    font-size: 14px;
    color: #555;
}

.meter-group {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-top: 20px;
    padding: 15px;
    background-color: #f0f8ff;
    border-radius: 8px;
}

.meter-group span:first-child {
    font-weight: 600;
    color: #333;
}

meter {
    flex-grow: 1;
    height: 24px;
}

#meter_ratio {
    font-weight: bold;
    color: #4CAF50;
    min-width: 60px;
}

#defaultCanvas0 {
    display: block;
    margin: 20px auto 0;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}