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

body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    padding: 20px;
    background-color: #f5f5f5;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    background-color: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

h1 {
    text-align: center;
    color: #333;
    margin-bottom: 30px;
}

h2 {
    color: #444;
    margin-bottom: 15px;
}

.function-area {
    margin-bottom: 30px;
    padding: 20px;
    border: 1px solid #ddd;
    border-radius: 5px;
    background-color: #fff;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 15px;
    margin-bottom: 15px;
}

.input-group div {
    display: flex;
    align-items: center;
    gap: 10px;
}

.time-offset-inputs {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
}

.time-offset-inputs div {
    display: flex;
    align-items: center;
    gap: 5px;
}

.time-offset-inputs input[type="number"] {
    width: 60px;
    text-align: right;
}

.time-offset-inputs label {
    min-width: auto;
    width: 40px;
}

label {
    min-width: 60px;
    color: #666;
}

input[type="datetime-local"],
input[type="number"],
select {
    padding: 8px;
    border: 1px solid #ddd;
    border-radius: 4px;
    flex: 1;
}

input[type="number"] {
    width: 80px;
}

select {
    width: 150px;
}

button {
    background-color: #4CAF50;
    color: white;
    padding: 10px 20px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
    transition: background-color 0.3s;
}

button:hover {
    background-color: #45a049;
}

.result-box {
    margin-top: 15px;
    padding: 15px;
    background-color: #f9f9f9;
    border: 1px solid #eee;
    border-radius: 4px;
    min-height: 50px;
}