<style>
body {
    font-family: sans-serif;
    line-height: 1.6;
    margin: 20px;
    background-color: #f4f4f4;
    color: #333;
}

.calculator-container {
    max-width: 600px;
    margin: 30px auto;
    padding: 25px;
    background-color: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

h2 {
    text-align: center;
    color: #2c3e50;
    margin-bottom: 20px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group > label { /* Labels principaux des étapes */
    display: block;
    font-weight: bold;
    margin-bottom: 10px;
    color: #3498db;
}

.dimension-group {
    border: 1px solid #eee;
    padding: 15px;
    margin-top: 10px;
    border-radius: 5px;
    background-color: #f9f9f9;
}

.dimension-group label {
    display: block; /* Chaque label sur sa ligne */
    margin-bottom: 5px;
    font-weight: normal;
    color: #555;
}

input[type="number"],
select {
    width: calc(100% - 22px); /* Ajuste pour padding et border */
    padding: 10px;
    margin-bottom: 10px;
    border: 1px solid #ccc;
    border-radius: 4px;
    box-sizing: border-box; /* Inclut padding et border dans la largeur */
}

/* Empêche l'affichage des flèches sur les champs number si non désiré (optionnel) */
input[type=number]::-webkit-inner-spin-button,
input[type=number]::-webkit-outer-spin-button {
  -webkit-appearance: none;
  margin: 0;
}
input[type=number] {
  -moz-appearance: textfield; /* Firefox */
}


button {
    display: block;
    width: 100%;
    padding: 12px 20px;
    background-color: #3498db;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 16px;
    transition: background-color 0.3s ease;
    margin-top: 15px;
}

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

#result-area {
    margin-top: 25px;
    padding: 15px;
    background-color: #eafaf1;
    border: 1px solid #1abc9c;
    border-radius: 5px;
    text-align: center;
    font-size: 1.1em;
    font-weight: bold;
    color: #16a085;
}

#result-area.error {
    background-color: #fbeaea;
    border-color: #e74c3c;
    color: #c0392b;
    font-weight: normal;
}

#info-note {
    margin-top: 20px;
    padding: 15px;
    background-color: #fef9e7;
    border: 1px solid #f39c12;
    border-radius: 5px;
    font-size: 0.9em;
    color: #d35400;
}

#info-note ul {
    margin-top: 5px;
    margin-bottom: 10px;
    padding-left: 20px; /* Indentation de la liste */
}
#info-note li {
     margin-bottom: 5px;
}

.warning-note {
    font-style: italic;
    color: #e74c3c;
    font-size: 0.9em;
    margin-bottom: 10px;
}
</style>