/* ============================================================
   EduCours Collège — page Exercices
   Fichier : modules/educours/college/assets/css/educours_college_exercices.css
   Chargé par educours_college_exercices.php, après educours_college.css
   (réutilise ses variables --ec-*).

   Le JavaScript de la page :
   - affiche/masque les cartes et l'explication via style.display
     → aucune règle "display" n'est imposée ici sur ces éléments ;
   - ajoute .ec-answer-correct / .ec-answer-wrong sur les réponses ;
   - remplace la classe du retour par "ec-exercise-feedback success|error".
   ============================================================ */

.ec-exercises-page {
    --ex-correct: #16a34a;
    --ex-correct-soft: #ecfdf3;
    --ex-correct-border: #86efac;
    --ex-wrong: #dc2626;
    --ex-wrong-soft: #fef2f2;
    --ex-wrong-border: #fca5a5;
}

/* ---------- Conteneur ---------- */

.ec-exercises-page .ec-exercise-container {
    max-width: 860px;
    margin-top: 20px;
}

/* ---------- Progression ---------- */

.ec-exercises-page .ec-exercise-progress {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 18px;
    padding: 14px 18px;
    background: var(--ec-surface, #fff);
    border: 1px solid var(--ec-border, #e6e8f0);
    border-radius: 999px;
    box-shadow: var(--ec-shadow, 0 4px 16px rgba(31, 36, 48, .06));
}

.ec-exercises-page .ec-exercise-progress > div:first-child {
    display: flex;
    align-items: baseline;
    gap: 8px;
    white-space: nowrap;
    font-size: .95rem;
    color: var(--ec-text-muted, #6b7280);
}

.ec-exercises-page .ec-exercise-progress strong {
    color: var(--ec-text, #1f2430);
    font-weight: 700;
}

.ec-exercises-page #ec-exercise-counter {
    font-variant-numeric: tabular-nums;
    font-weight: 700;
    color: var(--ec-primary, #4f46e5);
}

.ec-exercises-page .ec-exercise-progress-bar {
    flex: 1;
    height: 10px;
    background: var(--ec-primary-soft, #eef2ff);
    border-radius: 999px;
    overflow: hidden;
}

.ec-exercises-page .ec-exercise-progress-bar > span {
    display: block;
    height: 100%;
    min-width: 6px;
    background: linear-gradient(90deg, var(--ec-primary, #4f46e5), #8b5cf6);
    border-radius: 999px;
    transition: width .35s ease;
}

/* ---------- Carte question ---------- */

.ec-exercises-page .ec-exercise-card {
    background: var(--ec-surface, #fff);
    border: 1px solid var(--ec-border, #e6e8f0);
    border-radius: 22px;
    padding: 28px 30px;
    box-shadow: 0 10px 28px rgba(31, 41, 55, .06);
    animation: ecExIn .25s ease;
}

@keyframes ecExIn {
    from { opacity: 0; transform: translateY(6px); }
    to   { opacity: 1; transform: none; }
}

.ec-exercises-page .ec-exercise-number {
    display: inline-flex;
    align-items: center;
    padding: 6px 12px;
    margin-bottom: 14px;
    border-radius: 999px;
    background: var(--ec-primary-soft, #eef2ff);
    color: var(--ec-primary, #4f46e5);
    font-size: .82rem;
    font-weight: 800;
    letter-spacing: .03em;
    text-transform: uppercase;
}

.ec-exercises-page .ec-exercise-card h2 {
    margin: 0 0 22px;
    font-size: 1.35rem;
    line-height: 1.4;
    color: var(--ec-text, #1f2430);
}

/* ---------- Réponses ---------- */

.ec-exercises-page .ec-answer-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
}

.ec-exercises-page .ec-answer-btn {
    display: flex;
    align-items: center;
    gap: 14px;
    width: 100%;
    min-height: 60px;
    padding: 12px 16px;
    background: #fff;
    border: 2px solid var(--ec-border, #e6e8f0);
    border-radius: 16px;
    color: var(--ec-text, #1f2430);
    font: inherit;
    font-size: 1.05rem;
    font-weight: 600;
    text-align: left;
    cursor: pointer;
    transition: border-color .15s ease, background .15s ease, transform .15s ease, box-shadow .15s ease;
}

/* Lettre A / B / C / D */
.ec-exercises-page .ec-answer-btn > span {
    display: grid;
    place-items: center;
    flex: 0 0 36px;
    width: 36px;
    height: 36px;
    border-radius: 10px;
    background: var(--ec-primary-soft, #eef2ff);
    color: var(--ec-primary, #4f46e5);
    font-weight: 800;
    font-size: .95rem;
    transition: background .15s ease, color .15s ease;
}

.ec-exercises-page .ec-answer-btn:not(:disabled):hover {
    border-color: var(--ec-primary, #4f46e5);
    background: #fafaff;
    transform: translateY(-2px);
    box-shadow: 0 8px 18px rgba(79, 70, 229, .12);
}

.ec-exercises-page .ec-answer-btn:not(:disabled):hover > span {
    background: var(--ec-primary, #4f46e5);
    color: #fff;
}

.ec-exercises-page .ec-answer-btn:focus-visible {
    outline: 3px solid rgba(79, 70, 229, .35);
    outline-offset: 2px;
}

/* Après la réponse : les boutons sont désactivés */
.ec-exercises-page .ec-answer-btn:disabled {
    cursor: default;
    opacity: .55;
}

.ec-exercises-page .ec-answer-btn.ec-answer-correct {
    opacity: 1;
    border-color: var(--ex-correct);
    background: var(--ex-correct-soft);
    color: #14532d;
}

.ec-exercises-page .ec-answer-btn.ec-answer-correct > span {
    background: var(--ex-correct);
    color: #fff;
}

.ec-exercises-page .ec-answer-btn.ec-answer-wrong {
    opacity: 1;
    border-color: var(--ex-wrong);
    background: var(--ex-wrong-soft);
    color: #7f1d1d;
}

.ec-exercises-page .ec-answer-btn.ec-answer-wrong > span {
    background: var(--ex-wrong);
    color: #fff;
}

/* ---------- Retour + explication ---------- */

.ec-exercises-page .ec-exercise-feedback:empty {
    display: none;
}

.ec-exercises-page .ec-exercise-feedback {
    margin-top: 20px;
    padding: 12px 16px;
    border-radius: 14px;
    font-weight: 700;
    font-size: 1.02rem;
}

.ec-exercises-page .ec-exercise-feedback.success {
    background: var(--ex-correct-soft);
    border: 1px solid var(--ex-correct-border);
    color: #166534;
}

.ec-exercises-page .ec-exercise-feedback.error {
    background: var(--ex-wrong-soft);
    border: 1px solid var(--ex-wrong-border);
    color: #991b1b;
}

.ec-exercises-page .ec-explanation {
    margin-top: 12px;
    padding: 16px 18px;
    background: #fffbeb;
    border: 1px solid #fde68a;
    border-left: 5px solid #f59e0b;
    border-radius: 14px;
    line-height: 1.65;
    color: #3f3a2e;
}

.ec-exercises-page .ec-explanation strong {
    display: block;
    margin-bottom: 6px;
    color: #92400e;
}

/* ---------- Bouton "Question suivante" ---------- */

.ec-exercises-page .ec-next-exercise {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-top: 20px;
    margin-left: auto;
    padding: 12px 22px;
    background: var(--ec-primary, #4f46e5);
    border: 0;
    border-radius: 999px;
    color: #fff;
    font: inherit;
    font-weight: 700;
    cursor: pointer;
    box-shadow: 0 8px 18px rgba(79, 70, 229, .25);
    transition: background .15s ease, transform .15s ease;
}

.ec-exercises-page .ec-next-exercise:hover {
    background: var(--ec-primary-dark, #4338ca);
    transform: translateY(-1px);
}

/* ---------- Résultat final ---------- */

.ec-exercises-page .ec-exercise-result {
    padding: 36px 30px;
    text-align: center;
    background: linear-gradient(135deg, #f7f8ff, #fff);
    border: 1px solid #e4e7fb;
    border-radius: 22px;
    box-shadow: 0 10px 28px rgba(31, 41, 55, .06);
}

.ec-exercises-page .ec-result-icon {
    font-size: 3rem;
    line-height: 1;
}

.ec-exercises-page .ec-exercise-result h2 {
    margin: 12px 0 8px;
    font-size: 1.5rem;
}

.ec-exercises-page .ec-result-score {
    display: inline-block;
    margin: 6px 0 4px;
    padding: 8px 20px;
    border-radius: 999px;
    background: var(--ec-primary-soft, #eef2ff);
    color: var(--ec-primary, #4f46e5);
    font-size: 1.8rem;
    font-weight: 800;
    font-variant-numeric: tabular-nums;
}

.ec-exercises-page #ec-result-message {
    margin: 10px 0 0;
    color: var(--ec-text-muted, #6b7280);
}

.ec-exercises-page .ec-finish-actions {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
    margin-top: 22px;
}

.ec-exercises-page .ec-finish-actions > a,
.ec-exercises-page .ec-finish-actions > button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 12px 20px;
    border-radius: 999px;
    font: inherit;
    font-weight: 700;
    text-decoration: none;
    cursor: pointer;
    transition: transform .15s ease, box-shadow .15s ease;
}

.ec-exercises-page .ec-finish-actions > *:hover {
    transform: translateY(-1px);
    box-shadow: var(--ec-shadow, 0 4px 16px rgba(31, 36, 48, .1));
}

.ec-exercises-page .ec-finish-actions .ec-btn-secondary {
    background: #fff;
    border: 1px solid var(--ec-border, #e6e8f0);
    color: var(--ec-text, #1f2430);
}

.ec-exercises-page .ec-finish-actions .ec-btn-primary {
    background: var(--ec-primary, #4f46e5);
    border: 1px solid var(--ec-primary, #4f46e5);
    color: #fff;
}

.ec-exercises-page .ec-finish-actions .ec-btn-quiz {
    background: linear-gradient(135deg, #667eea, #764ba2);
    border: 0;
    color: #fff;
}

/* ---------- Mobile ---------- */

@media (max-width: 700px) {
    .ec-exercises-page .ec-answer-grid {
        grid-template-columns: 1fr;
    }

    .ec-exercises-page .ec-exercise-card {
        padding: 22px 18px;
        border-radius: 18px;
    }

    .ec-exercises-page .ec-exercise-card h2 {
        font-size: 1.15rem;
    }

    .ec-exercises-page .ec-exercise-progress {
        border-radius: 16px;
    }

    .ec-exercises-page .ec-next-exercise,
    .ec-exercises-page .ec-finish-actions > * {
        width: 100%;
    }
}