/* === OptiFuel Simulator — charte MonRechaud === */

.optifuel-container {
    --of-orange:        #e07330;
    --of-orange-dark:   #c25e20;
    --of-orange-light:  #fdf0e6;
    --of-dark:          #1a2733;
    --of-text:          #2e3a47;
    --of-muted:         #6b7685;
    --of-bg:            #f8f6f3;
    --of-surface:       #ffffff;
    --of-border:        #e3ddd6;
    --of-shadow:        0 4px 24px rgba(26, 39, 51, 0.09);
    --of-radius-sm:     4px;
    --of-radius:        8px;
    --of-radius-lg:     12px;
    --of-font:          -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;

    max-width: 680px;
    margin: 30px auto;
    font-family: var(--of-font);
    color: var(--of-text);
    line-height: 1.6;
    font-size: 15px;
}

/* ── Carte principale du formulaire ── */
.optifuel-form-card {
    background: var(--of-surface);
    border: 1px solid var(--of-border);
    border-radius: var(--of-radius-lg);
    padding: 32px;
    box-shadow: var(--of-shadow);
}

.optifuel-form-header {
    margin-bottom: 28px;
    padding-bottom: 20px;
    border-bottom: 2px solid var(--of-orange-light);
}

.optifuel-form-header h2 {
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--of-dark);
    margin: 0 0 4px;
    line-height: 1.3;
}

.optifuel-form-header p {
    font-size: 0.875rem;
    color: var(--of-muted);
    margin: 0;
}

/* ── Titres de section ── */
.optifuel-section-title {
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.09em;
    text-transform: uppercase;
    color: var(--of-orange);
    margin: 0 0 18px;
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 0;
    border: none;
    background: none;
}

.optifuel-section-title::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--of-border);
}

/* ── Grille 2 colonnes ── */
.optifuel-grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

/* ── Groupes de champ ── */
.optifuel-form-group {
    margin-bottom: 20px;
}

.optifuel-form-group:last-child {
    margin-bottom: 0;
}

.optifuel-form-group > label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--of-text);
    margin-bottom: 7px;
}

.optifuel-form-group > label strong {
    color: var(--of-orange);
    font-weight: 700;
}

/* ── Inputs & Select ── */
.optifuel-form-group input[type="number"],
.optifuel-form-group select {
    width: 100%;
    padding: 10px 13px;
    border: 1.5px solid var(--of-border);
    border-radius: var(--of-radius-sm);
    font-family: var(--of-font);
    font-size: 0.95rem;
    color: var(--of-text);
    background: var(--of-surface);
    transition: border-color 0.18s ease, box-shadow 0.18s ease;
    box-sizing: border-box;
    -webkit-appearance: none;
    appearance: none;
    line-height: 1.4;
}

.optifuel-form-group select {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M0 0l5 6 5-6z' fill='%236b7685'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 13px center;
    padding-right: 36px;
    cursor: pointer;
}

.optifuel-form-group input[type="number"]:focus,
.optifuel-form-group select:focus {
    outline: none;
    border-color: var(--of-orange);
    box-shadow: 0 0 0 3px rgba(224, 115, 48, 0.13);
}

.optifuel-hint {
    display: block;
    margin-top: 5px;
    font-size: 0.8rem;
    color: var(--of-muted);
    line-height: 1.4;
}

/* ── Séparateur ── */
.optifuel-divider {
    border: none;
    border-top: 1px solid var(--of-border);
    margin: 26px 0;
}

/* ── Radio pills ── */
.optifuel-radio-group {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.optifuel-radio-group label {
    display: inline-flex;
    align-items: center;
    padding: 7px 16px;
    border: 1.5px solid var(--of-border);
    border-radius: 100px;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--of-text);
    cursor: pointer;
    transition: border-color 0.18s ease, background 0.18s ease, color 0.18s ease;
    user-select: none;
    white-space: nowrap;
}

.optifuel-radio-group input[type="radio"] {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
    pointer-events: none;
}

.optifuel-radio-group label:hover {
    border-color: var(--of-orange);
    color: var(--of-orange);
}

.optifuel-radio-group label.is-checked {
    background: var(--of-orange);
    border-color: var(--of-orange);
    color: #fff;
    font-weight: 600;
}

/* ── Bouton principal ── */
#optifuel-submit-button {
    width: 100%;
    padding: 14px 24px;
    background: var(--of-orange);
    color: #fff;
    border: none;
    border-radius: var(--of-radius);
    font-family: var(--of-font);
    font-size: 1rem;
    font-weight: 700;
    letter-spacing: 0.02em;
    cursor: pointer;
    transition: background 0.2s ease, transform 0.1s ease;
    display: block;
}

#optifuel-submit-button:hover {
    background: var(--of-orange-dark);
}

#optifuel-submit-button:active {
    transform: translateY(1px);
}

#optifuel-submit-button:disabled {
    opacity: 0.65;
    cursor: not-allowed;
    transform: none;
}

/* ── Zone de résultats ── */
.optifuel-results {
    margin-top: 20px;
    background: var(--of-surface);
    border: 1px solid var(--of-border);
    border-radius: var(--of-radius-lg);
    padding: 28px 32px;
    box-shadow: var(--of-shadow);
}

.optifuel-results-title {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--of-dark);
    margin: 0 0 20px;
    padding-bottom: 14px;
    border-bottom: 2px solid var(--of-orange-light);
}

/* ── Synthèse chiffres ── */
.optifuel-summary {
    list-style: none;
    padding: 14px 18px;
    margin: 0 0 20px;
    background: var(--of-bg);
    border-radius: var(--of-radius);
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.optifuel-summary li {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    font-size: 0.875rem;
    color: var(--of-muted);
}

.optifuel-summary li strong {
    color: var(--of-text);
    font-size: 0.95rem;
    font-weight: 700;
}

/* ── Recommandation cartouches ── */
.optifuel-reco-label {
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.09em;
    text-transform: uppercase;
    color: var(--of-orange);
    margin-bottom: 14px;
}

.optifuel-combo-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 14px;
    align-items: center;
}

.optifuel-chip {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-width: 72px;
    padding: 12px 14px;
    background: var(--of-orange-light);
    border: 2px solid var(--of-orange);
    border-radius: var(--of-radius);
    text-align: center;
}

.optifuel-chip-count {
    font-size: 1.9rem;
    font-weight: 800;
    color: var(--of-orange);
    line-height: 1;
}

.optifuel-chip-size {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--of-orange-dark);
    margin-top: 3px;
    letter-spacing: 0.03em;
}

.optifuel-chip-separator {
    font-size: 1.4rem;
    color: var(--of-border);
    font-weight: 300;
    line-height: 1;
}

.optifuel-combo-info {
    font-size: 0.85rem;
    color: var(--of-muted);
    margin: 0;
    line-height: 1.5;
}

.optifuel-combo-info strong {
    color: var(--of-text);
}

/* ── État "aucun usage" ── */
.optifuel-reco-none {
    background: #fff8f0;
    border: 1.5px solid #fcd8b0;
    border-radius: var(--of-radius);
    padding: 14px 18px;
    font-size: 0.875rem;
    color: #8c5a1a;
}

/* ── Message erreur ── */
.optifuel-error {
    background: #fff5f5;
    border: 1.5px solid #fcc;
    border-radius: var(--of-radius);
    padding: 14px 18px;
    font-size: 0.875rem;
    color: #c0392b;
}

/* ── Estimation (réchaud inconnu) ── */
.optifuel-notice {
    font-size: 0.8rem;
    color: var(--of-muted);
    font-style: italic;
    margin-top: 10px;
    margin-bottom: 0;
}

/* ── Conseils d'optimisation ── */
.optimization-tips {
    margin-top: 18px;
    padding: 13px 16px;
    background: var(--of-bg);
    border-left: 3px solid var(--of-orange);
    border-radius: 0 var(--of-radius-sm) var(--of-radius-sm) 0;
    font-size: 0.82rem;
    color: var(--of-muted);
    line-height: 1.55;
}

.optimization-tips p {
    margin: 0;
}

.optimization-tips strong {
    color: var(--of-text);
}

/* ── Responsive ── */
@media (max-width: 540px) {
    .optifuel-form-card,
    .optifuel-results {
        padding: 20px;
    }
    .optifuel-grid-2 {
        grid-template-columns: 1fr;
    }
    .optifuel-combo-chips {
        gap: 8px;
    }
}