body {
    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    color: #333;
    background-color: #f9f9f9;
}
h1 {
    color: #2c3e50;
    text-align: center;
    margin-bottom: 30px;
}
.calculator {
    background-color: white;
    border-radius: 10px;
    padding: 20px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}
.form-group {
    margin-bottom: 20px;
}
label {
    display: block;
    margin-bottom: 8px;
    font-weight: bold;
}
input,
button {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 16px;
}
input {
    width: 98%;
}
button {
    background-color: #3498db;
    color: white;
    border: none;
    cursor: pointer;
    margin-top: 10px;
    transition: background-color 0.3s;
}
button:hover {
    background-color: #2980b9;
}
#results,
#dilution-section,
#warning {
    margin-top: 20px;
    padding: 15px;
    border-radius: 5px;
}
#results {
    background-color: #e8f4f8;
    display: none;
}
#dilution-section {
    display: none;
}
#warning {
    background-color: #fdf2e9;
    border-left: 4px solid #e67e22;
    margin-top: 30px;
}
.disclaimer {
    font-size: 14px;
    color: #7f8c8d;
    margin-top: 30px;
    text-align: center;
}
.language-toggle {
    display: flex;
    justify-content: flex-end;
    margin-bottom: 20px;
}
.language-btn {
    background-color: #95a5a6;
    color: white;
    border: none;
    padding: 8px 15px;
    margin-left: 10px;
    border-radius: 4px;
    cursor: pointer;
    width: auto;
}
.language-btn.active {
    background-color: #3498db;
}