* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Nunito', sans-serif;
    background: #f5f4f0;
    color: #2C2C2A;
    padding: 1.5rem;
    max-width: 720px;
    margin: 0 auto;
}

.hero {
    text-align: center;
    padding: 2.5rem 1rem 2rem;
}

.hero h1 {
    font-size: 2rem;
    font-weight: 800;
    line-height: 1.2;
}

.hero p {
    font-size: 1rem;
    color: #5F5E5A;
    margin-top: 0.5rem;
}

.badge-row {
    display: flex;
    justify-content: center;
    gap: 10px;
    flex-wrap: wrap;
    margin-top: 1.2rem;
}

.badge {
    font-size: 12px;
    font-weight: 700;
    padding: 4px 14px;
    border-radius: 20px;
}

.b-blue {
    background: #E6F1FB;
    color: #0C447C;
}

.b-purple {
    background: #EEEDFE;
    color: #3C3489;
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.88rem;
    font-weight: 700;
    color: #3C3489;
    text-decoration: none;
    margin-bottom: 1.5rem;
    background: #EEEDFE;
    border: 0.5px solid #AFA9EC;
    border-radius: 8px;
    padding: 6px 14px;
    transition: background 0.15s;
}

.back-link:hover {
    background: #CECBF6;
}

.card {
    border-radius: 16px;
    border: 0.5px solid #D3D1C7;
    background: #ffffff;
    padding: 1.4rem 1.5rem;
    margin-bottom: 1.2rem;
}

.stitle {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.1rem;
    font-weight: 800;
    margin-bottom: 0.8rem;
}

.pill {
    width: 32px;
    height: 32px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: 700;
    flex-shrink: 0;
}

.p-blue {
    background: #B5D4F4;
    color: #0C447C;
}

.p-purple {
    background: #CECBF6;
    color: #3C3489;
}

.p-teal {
    background: #9FE1CB;
    color: #085041;
}

.p-amber {
    background: #FAC775;
    color: #633806;
}

.desc {
    font-size: 0.94rem;
    color: #5F5E5A;
    line-height: 1.7;
    margin-bottom: 0.9rem;
}

.code-block {
    background: #F1EFE8;
    border: 0.5px solid #B4B2A9;
    border-radius: 10px;
    padding: 0.9rem 1.1rem;
    font-family: 'Fira Code', monospace;
    font-size: 0.84rem;
    line-height: 1.8;
    white-space: pre;
    overflow-x: auto;
    color: #2C2C2A;
}

.tag {
    color: #185FA5;
}

.attr {
    color: #854F0B;
}

.val {
    color: #0F6E56;
}

.err {
    color: #E24B4A;
    font-weight: 700;
}

.rl {
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: #888780;
    margin-bottom: 6px;
}

.tip {
    display: flex;
    gap: 10px;
    align-items: flex-start;
    background: #E1F5EE;
    border-radius: 10px;
    padding: 0.75rem 1rem;
    margin-top: 0.9rem;
    font-size: 0.88rem;
    color: #085041;
    line-height: 1.5;
}

.tip-purple {
    background: #EEEDFE;
    color: #3C3489;
}

.tip-i {
    font-size: 16px;
    flex-shrink: 0;
    margin-top: 1px;
}

.kbd {
    display: inline-block;
    background: #F1EFE8;
    border: 0.5px solid #B4B2A9;
    border-radius: 6px;
    padding: 2px 8px;
    font-family: 'Fira Code', monospace;
    font-size: 0.82rem;
    color: #2C2C2A;
}

/* Exercice 1 */
.question {
    margin-bottom: 1.3rem;
}

.question:last-of-type {
    margin-bottom: 0;
}

.choices {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin: 0.7rem 0 0.5rem;
}

.choice-btn {
    border: 0.5px solid #B4B2A9;
    background: #F1EFE8;
    color: #2C2C2A;
    border-radius: 8px;
    padding: 5px 14px;
    font-size: 0.85rem;
    font-family: 'Fira Code', monospace;
    cursor: pointer;
    transition: background 0.12s;
}

.choice-btn:hover {
    background: #D3D1C7;
}

.choice-btn.correct {
    background: #E1F5EE;
    color: #085041;
    border-color: #5DCAA5;
}

.choice-btn.wrong {
    background: #FCEBEB;
    color: #791F1F;
    border-color: #F09595;
}

.choice-btn:disabled {
    cursor: default;
}

.feedback {
    font-size: 0.88rem;
    min-height: 1.4em;
    font-weight: 700;
}

.feedback.ok {
    color: #0F6E56;
}

.feedback.ko {
    color: #A32D2D;
}

.progress-wrap {
    height: 7px;
    background: #D3D1C7;
    border-radius: 10px;
    margin: 1.2rem 0 0;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: #5DCAA5;
    border-radius: 10px;
    transition: width 0.4s;
    width: 0%;
}

.score-row {
    display: flex;
    gap: 10px;
    margin-top: 0.6rem;
    flex-wrap: wrap;
}

.chip {
    font-size: 12px;
    font-weight: 700;
    padding: 4px 12px;
    border-radius: 20px;
}

.chip-ok {
    background: #E1F5EE;
    color: #085041;
}

.chip-ko {
    background: #FCEBEB;
    color: #791F1F;
}

/* Exercice 2 */
.indent-code {
    width: 100%;
    min-height: 200px;
    font-family: 'Fira Code', monospace;
    font-size: 0.84rem;
    line-height: 1.8;
    background: #F1EFE8;
    border: 0.5px solid #B4B2A9;
    border-radius: 10px;
    padding: 0.9rem 1.1rem;
    color: #2C2C2A;
    resize: vertical;
    outline: none;
}

.indent-code:focus {
    border-color: #888780;
}

.btn-row {
    display: flex;
    gap: 8px;
    margin-top: 0.8rem;
    flex-wrap: wrap;
}

.action-btn {
    border: 0.5px solid #B4B2A9;
    background: #ffffff;
    color: #2C2C2A;
    border-radius: 8px;
    padding: 7px 16px;
    font-size: 0.88rem;
    font-family: 'Nunito', sans-serif;
    font-weight: 700;
    cursor: pointer;
    transition: background 0.12s;
}

.action-btn:hover {
    background: #F1EFE8;
}

.action-btn.primary {
    background: #E1F5EE;
    color: #085041;
    border-color: #5DCAA5;
}

.action-btn.primary:hover {
    background: #9FE1CB;
}

.indent-feedback {
    font-size: 0.9rem;
    margin-top: 0.9rem;
    line-height: 1.6;
    font-weight: 700;
    min-height: 1.4em;
}

.indent-feedback.ok {
    color: #0F6E56;
}

.indent-feedback.ko {
    color: #A32D2D;
}

.indent-feedback.mid {
    color: #854F0B;
}

.footer-note {
    text-align: center;
    padding: 2rem 1rem 2.5rem;
    color: #888780;
    font-size: 0.9rem;
}

@media (max-width: 500px) {
    .hero h1 {
        font-size: 1.6rem;
    }
}