body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 20px;
    background-color: #f4f4f9;
    color: #333;
}
.container {
    max-width: 600px;
    margin: 0 auto;
    background-color: #fff;
    padding: 25px;
    border-radius: 10px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
}
h2 {
    text-align: center;
    color: #0056b3;
    border-bottom: 2px solid #0056b3;
    padding-bottom: 10px;
    margin-bottom: 20px;
}
h3 {
    color: #555;
    margin-top: 25px;
    margin-bottom: 15px;
}
.description {
    font-size: 0.95em;
    line-height: 1.5;
    color: #444;
    margin-bottom: 20px;
    padding: 10px;
    background-color: #e0f7fa;
    border-left: 4px solid #0097a7;
}
.input-group, .result-group {
    margin-bottom: 15px;
}
label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
}
input[type="number"], select {
    width: calc(100% - 12px);
    padding: 8px;
    border: 1px solid #ccc;
    border-radius: 5px;
    box-sizing: border-box;
}
.result-group {
    padding: 15px;
    border: 1px solid #ddd;
    border-radius: 5px;
    background-color: #e9ecef;
}
.result-group p {
    margin: 5px 0;
    font-size: 1.1em;
    font-weight: bold;
}
.note {
    font-size: 0.9em;
    color: #6c757d;
    margin-top: 5px;
}
.warning {
    color: #dc3545;
    font-weight: bold;
    margin-top: 15px;
    padding: 10px;
    background-color: #f8d7da;
    border: 1px solid #f5c6cb;
    border-radius: 5px;
    text-align: center;
}
.hidden {
    display: none;
}
.safe { color: #28a745 !important; }
.caution { color: #ffc107 !important; }
.danger { color: #dc3545 !important; }