.sd-box {
    --sd-primary: #146c43;
    --sd-primary-dark: #0f5132;
    --sd-border: #d8dee4;
    --sd-muted: #667085;
    box-sizing: border-box;
    max-width: 820px;
    margin: 24px auto;
    padding: clamp(20px, 4vw, 38px);
    border: 1px solid var(--sd-border);
    border-radius: 14px;
    background: #fff;
    color: #1d2939;
    box-shadow: 0 8px 28px rgba(16, 24, 40, .08);
}

.sd-box * { box-sizing: border-box; }
.sd-box h2 { margin-top: 0; }
.sd-progress-text { margin-bottom: 8px; color: var(--sd-muted); font-weight: 600; }
.sd-progress { height: 8px; margin-bottom: 28px; overflow: hidden; border-radius: 999px; background: #edf1f4; }
.sd-progress span { display: block; height: 100%; background: var(--sd-primary); }
.sd-question-content { margin: 0 0 18px; }
.sd-question-image img { display: block; width: auto; max-width: 100%; max-height: 380px; margin: 18px auto; border-radius: 8px; }
.sd-options { display: grid; gap: 12px; margin: 24px 0; padding: 0; border: 0; }
.sd-option { display: flex; align-items: center; gap: 12px; padding: 15px; border: 2px solid var(--sd-border); border-radius: 10px; color: #1d2939; text-decoration: none; cursor: pointer; transition: border-color .15s, background .15s; }
.sd-option:hover { border-color: #98a2b3; background: #f9fafb; }
.sd-option:focus { outline: 3px solid rgba(20, 108, 67, .25); outline-offset: 2px; }
.sd-option:has(input:checked) { border-color: var(--sd-primary); background: #ecfdf3; }
.sd-option input { width: 18px; height: 18px; margin: 0; flex: 0 0 auto; }
.sd-letter { display: inline-grid; width: 30px; height: 30px; place-items: center; flex: 0 0 auto; border-radius: 50%; background: #eef2f6; font-weight: 700; }
.sd-actions { display: flex; justify-content: flex-end; gap: 12px; margin-top: 24px; }
.sd-button { display: inline-block; appearance: none; padding: 12px 22px; border: 2px solid var(--sd-primary); border-radius: 8px; background: var(--sd-primary); color: #fff; font: inherit; font-weight: 700; text-align: center; text-decoration: none; cursor: pointer; }
.sd-button:hover, .sd-button:focus { border-color: var(--sd-primary-dark); background: var(--sd-primary-dark); color: #fff; }
.sd-button-secondary { margin-right: auto; background: #fff; color: var(--sd-primary); }
.sd-score { display: grid; justify-items: center; margin: 24px 0 30px; padding: 25px; border-radius: 12px; background: #ecfdf3; text-align: center; }
.sd-score strong { font-size: clamp(32px, 7vw, 54px); line-height: 1.1; color: var(--sd-primary-dark); }
.sd-score span { margin-top: 6px; color: var(--sd-muted); }
.sd-answer-key { display: grid; gap: 14px; margin-bottom: 25px; }
.sd-answer { padding: 16px 18px; border-left: 5px solid; border-radius: 8px; background: #f8fafc; }
.sd-answer.is-correct { border-color: #198754; background: #f0fff6; }
.sd-answer.is-wrong { border-color: #dc3545; background: #fff5f5; }
.sd-answer h4 { margin: 0 0 10px; }
.sd-answer p { margin: 6px 0; }
.sd-notice { margin: 16px 0; padding: 12px 14px; border-radius: 7px; background: #fff6db; }
.sd-error { background: #fff0f0; color: #842029; }
.sd-quiz-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; margin-top: 24px; }
.sd-quiz-card { display: flex; flex-direction: column; padding: 20px; border: 1px solid var(--sd-border); border-radius: 10px; background: #f8fafc; }
.sd-quiz-card h3 { margin: 0 0 8px; font-size: 1.15em; }
.sd-quiz-card p { flex: 1; color: var(--sd-muted); }
.sd-quiz-card .sd-button { width: 100%; }
.sd-explanation { padding-top: 8px; border-top: 1px solid var(--sd-border); }
.sd-commercial { line-height: 1.68; }
.sd-commercial h3 { margin-top: 1.7em; }
.sd-commercial h4 { margin-top: 1.5em; }
.sd-eyebrow { margin-bottom: 6px; color: var(--sd-primary); font-size: .82em; font-weight: 800; letter-spacing: .06em; text-transform: uppercase; }
.sd-main-cta { margin-top: 8px; }
.sd-cta-note, .sd-disclaimer { color: var(--sd-muted); font-size: .9em; }
.sd-summary { margin: 28px 0; padding: 16px 18px; border-left: 4px solid var(--sd-primary); background: #f3faf6; }
.sd-checklist { padding-left: 22px; }
.sd-checklist li { margin-bottom: 8px; }
.sd-faq details { margin: 10px 0; padding: 13px 15px; border: 1px solid var(--sd-border); border-radius: 8px; }
.sd-faq summary { cursor: pointer; font-weight: 700; }
.sd-faq details p { margin-bottom: 0; }
.sd-sources { margin-top: 26px; padding-top: 2px; border-top: 1px solid var(--sd-border); }
.sd-independent { margin-top: 24px; padding: 16px 18px; border-radius: 8px; background: #f8fafc; }
.sd-independent p { margin: 5px 0 0; }

@media (max-width: 600px) {
    .sd-box { margin: 12px 0; border-radius: 10px; }
    .sd-actions { align-items: stretch; flex-direction: column-reverse; }
    .sd-button, .sd-button-secondary { width: 100%; margin: 0; }
    .sd-quiz-grid { grid-template-columns: 1fr; }
}