:root {
    --seq-primary: #0284c7;
    --seq-dark: #0f172a;
    --seq-card-bg: #ffffff;
    --seq-border: #e2e8f0;
    --seq-text: #1e293b;
    --seq-muted: #64748b;
}

.sequence-container {
    max-width: 920px;
    margin: 0 auto;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    color: var(--seq-text);
    line-height: 1.75;
    padding: 1.5rem;
}

.seq-card {
    background: var(--seq-card-bg);
    border: 1px solid var(--seq-border);
    border-radius: 12px;
    padding: 1.5rem 1.8rem;
    margin-bottom: 2rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
}

.seq-header-box {
    background: linear-gradient(135deg, #f8fafc 0%, #e0f2fe 100%);
    border-left: 6px solid #0284c7;
}

.seq-badge {
    display: inline-block;
    background: #0284c7;
    color: white;
    font-size: 0.8rem;
    font-weight: 700;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 0.8rem;
}

.seq-title {
    margin: 0 0 0.5rem 0;
    color: #0c4a6e;
    font-size: 1.6rem;
}

.seq-lead {
    font-size: 1.1rem;
    color: var(--seq-muted);
    margin: 0 0 1rem 0;
}

.seq-objectifs {
    background: rgba(255, 255, 255, 0.75);
    border-radius: 8px;
    padding: 1rem 1.25rem;
}
.seq-objectifs h4 { margin: 0 0 0.5rem 0; color: #0369a1; }
.seq-objectifs ul { margin: 0; padding-left: 1.2rem; }

.rappels-box { background: #faf5ff; border-left: 5px solid #a855f7; }
.rappels-box h4 { margin: 0 0 0.5rem 0; color: #7e22ce; }

.definition-box { background: #f0f9ff; border-left: 5px solid #0284c7; }
.definition-box h4 { margin: 0 0 0.5rem 0; color: #0369a1; }

.example-box { background: #f0fdf4; border-left: 5px solid #10b981; }
.example-box h4 { margin: 0 0 0.5rem 0; color: #047857; }

.note-box { background: #fffbeb; border-left: 5px solid #f59e0b; }
.note-box h4 { margin: 0 0 0.5rem 0; color: #b45309; }

.retenir-box { background: #eff6ff; border: 2px dashed #3b82f6; border-radius: 12px; }
.retenir-box h4 { margin: 0 0 0.5rem 0; color: #1d4ed8; }

.formule-box {
    background: #0f172a;
    color: #f8fafc;
    border-radius: 12px;
    text-align: center;
    padding: 1.5rem;
}
.formule-box h4 { margin-top: 0; color: #38bdf8; }
.formule-display {
    font-size: 1.6rem;
    font-family: "Cambria Math", "Times New Roman", serif;
    margin: 1rem 0;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.5rem;
}

.chem-frac {
    display: inline-flex;
    flex-direction: column;
    vertical-align: middle;
    text-align: center;
    padding: 0 4px;
    font-style: italic;
}
.chem-frac-top { border-bottom: 2px solid currentColor; padding: 0 4px; }
.chem-frac-bottom { padding: 0 4px; }

.raisonnement-step {
    background: white;
    border: 1px solid #e2e8f0;
    border-radius: 8px;
    padding: 0.8rem 1rem;
    margin-top: 0.8rem;
}

.media-container figure { margin: 0; text-align: center; }
.media-container img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.08);
}
.media-container figcaption {
    font-size: 0.88rem;
    color: var(--seq-muted);
    margin-top: 0.5rem;
    font-style: italic;
}

.protocol-shell { background: #fdfdfd; }
.protocol-title { margin-top: 0; color: #0284c7; }
.protocol-steps { display: flex; flex-direction: column; gap: 1rem; margin-top: 1rem; }
.protocol-step { display: flex; gap: 1rem; align-items: flex-start; }
.step-num {
    background: #0284c7;
    color: white;
    font-weight: 800;
    border-radius: 50%;
    min-width: 34px;
    height: 34px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.95rem;
}
.step-body { flex: 1; padding-top: 0.25rem; }

/* QCM Interactif */
.qcm-wrapper { background: #f8fafc; border: 1.5px solid #cbd5e1; }
.qcm-title { margin-top: 0; color: #1e293b; }
.qcm-intro { color: var(--seq-muted); font-size: 0.95rem; }
.qcm-card {
    background: white;
    border: 1px solid #e2e8f0;
    border-radius: 8px;
    padding: 1.2rem;
    margin-bottom: 1.2rem;
}
.qcm-question { font-weight: 700; margin-bottom: 0.8rem; color: #0f172a; }
.qcm-option {
    display: block;
    margin-bottom: 0.5rem;
    padding: 0.5rem 0.8rem;
    border-radius: 6px;
    cursor: pointer;
    border: 1px solid transparent;
}
.qcm-option:hover { background: #f1f5f9; }
.qcm-feedback {
    display: none;
    margin-top: 0.8rem;
    padding: 0.75rem 1rem;
    border-radius: 6px;
    font-size: 0.9rem;
    background: #f1f5f9;
}
.btn-qcm-valider {
    background: #0284c7;
    color: white;
    border: none;
    padding: 0.8rem 1.8rem;
    font-size: 1rem;
    font-weight: 700;
    border-radius: 8px;
    cursor: pointer;
    box-shadow: 0 4px 10px rgba(2, 132, 199, 0.3);
}
.btn-qcm-valider:hover { background: #0369a1; }
.qcm-resultat-box {
    margin-top: 1.5rem;
    padding: 1.2rem;
    border-radius: 8px;
    text-align: center;
}