body {
    font-family: 'Malgun Gothic', sans-serif;
    background-color: #f4f4f9;
    color: #333;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}

.container {
    background: #fff;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    text-align: center;
    width: 90%;
    max-width: 500px;
}

h1 {
    color: #2c3e50;
    margin-bottom: 0.5rem;
}

p {
    color: #7f8c8d;
    margin-bottom: 1.5rem;
}

#inputText {
    width: calc(100% - 22px);
    padding: 10px;
    font-size: 1rem;
    border: 1px solid #ddd;
    border-radius: 5px;
    margin-bottom: 1rem;
}

#calculateBtn {
    width: 100%;
    padding: 12px;
    font-size: 1.1rem;
    font-weight: bold;
    color: #fff;
    background-color: #3498db;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s;
}

#calculateBtn:hover {
    background-color: #2980b9;
}

#result-container {
    margin-top: 1.5rem;
    text-align: left;
    background-color: #ecf0f1;
    padding: 1rem;
    border-radius: 5px;
}

.result-item {
    font-size: 1.1rem;
    color: #2c3e50;
    margin: 0.5rem 0;
    display: flex;
    justify-content: space-between;
}

.result-item span {
    font-weight: bold;
    color: #e74c3c;
}