body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 20px;
    background-color: #f5f7fa;
    color: #333;
}
.container {
    max-width: 1200px;
    margin: 0 auto;
    background-color: white;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
    padding: 20px;
}
header{
    background-color:#2c3e50;
    border-radius: 6px;
    color: white;
}
h1 {
    text-align: center;
    margin-bottom: 20px;
}
h2 {
    text-align: center;
    margin-bottom: 20px;
}
.form-section {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    margin-bottom: 30px;
    padding: 20px;
    background-color: #f8f9fa;
    border-radius: 6px;
}
.form-group {
    flex: 1;
    min-width: 200px;
}
label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: #495057;
}
select, .checkbox-group {
    width: 100%;
    padding: 10px;
    border: 1px solid #ced4da;
    border-radius: 4px;
    background-color: white;
    font-size: 16px;
}
.checkbox-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding: 10px;
    height: auto;
}
.checkbox-item {
    display: flex;
    align-items: center;
    gap: 8px;
}
button {
    background-color: #3498db;
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
    font-weight: 600;
    transition: background-color 0.3s;
    margin-top: 20px;
}
button:hover {
    background-color: #2980b9;
}
.chart-container {
    position: relative;
    height: 500px;
    margin-top: 20px;
}
.loading {
    text-align: center;
    padding: 20px;
    font-style: italic;
    color: #6c757d;
}
.error {
    color: #e74c3c;
    text-align: center;
    padding: 20px;
}

  /* Cards grid (auto-fit évite les media queries) */
  .grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:var(--gap)}

  .card{
    display:block;text-decoration:none;color:inherit;
    background:#fff;padding:1.5rem;border-radius:var(--radius);
    box-shadow:var(--shadow);
    transition:transform .2s, box-shadow .2s;
    will-change:transform;
  }
  .card:hover,.card:focus-visible{transform:translateY(-5px);box-shadow:var(--shadow-hover);outline:none}
  .card h2{margin:0;font-weight:600;font-size:clamp(1rem,.6vw+0.9rem,1.25rem)}

@media (max-width: 768px) {
    .form-section {
        flex-direction: column;
    }
    .form-group {
        min-width: 100%;
    }
}