body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #74ebd5, #9face6);
    margin: 0;
    padding: 20px;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    min-height: 100vh;
    color: #333333;
    box-sizing: border-box;
}

.container {
    background: linear-gradient(135deg, #ffecd2, #fcb69f);
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 0 15px rgba(0, 0, 0, 0.2);
    width: 320px;
    text-align: center;
    margin-top: 20px;
    margin-bottom: 20px;
}

h1 {
    margin-bottom: 20px;
    color: #333333;
    text-shadow: 1px 1px 2px #ffffff;
}

.input-group {
    margin-bottom: 15px;
    text-align: left;
}

label {
    display: block;
    margin-bottom: 5px;
    color: #444444;
}

input,
select {
    width: calc(100% - 22px);
    padding: 10px;
    border: 1px solid #dddddd;
    border-radius: 8px;
    background-color: #fdfdfd;
}

button {
    width: 100%;
    padding: 12px;
    border: none;
    border-radius: 8px;
    background-color: #ff7b54;
    color: white;
    font-size: 18px;
    font-weight: bold;
    cursor: pointer;
    transition: background-color 0.3s;
}

button:hover {
    background-color: #ff5722;
}

#error-message {
    color: red;
    font-weight: bold;
    display: none;
}

#error-message.visible {
    display: block;
}

#results {
    margin-top: 20px;
    text-align: left;
    background: rgba(255, 255, 255, 0.8);
    padding: 15px;
    border-radius: 8px;
}

#error-message {
    color: red;
    font-weight: bold;
}

.error {
    border: 2px solid red;
}