body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: #f4f7f9;
    color: #333;
    margin: 0;
    padding: 20px;
    display: flex;
    justify-content: center;
}

.container {
    max-width: 600px;
    width: 100%;
    background: #fff;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

h1 {
    text-align: center;
    margin-bottom: 20px;
    color: #2c3e50;
}

#color-preview {
    width: 100%;
    height: 150px;
    border-radius: 8px;
    margin-bottom: 30px;
    background-color: #dddddd;
    border: 1px solid #ddd;
    transition: background-color 0.3s ease;
}

.converter-wrapper {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.input-group {
    display: flex;
    flex-direction: column;
}

.input-group label {
    font-weight: bold;
    margin-bottom: 8px;
    color: #34495e;
}

.input-group input[type="text"],
.input-group input[type="number"] {
    width: 100%;
    padding: 12px;
    border: 1px solid #ccc;
    border-radius: 4px;
    font-size: 16px;
    box-sizing: border-box;
}

.input-row {
    display: flex;
    gap: 10px;
}

.input-row input {
    flex: 1;
}

.content {
    margin-top: 40px;
    line-height: 1.6;
}

h2 {
    color: #2c3e50;
    border-bottom: 2px solid #ecf0f1;
    padding-bottom: 10px;
    margin-top: 30px;
}

h3 {
    color: #34495e;
    margin-top: 20px;
}

@media (max-width: 600px) {
    body {
        padding: 10px;
    }
    .container {
        padding: 20px;
    }
    .input-row {
        flex-direction: column;
    }
}