.introduction-section p{margin-bottom:1.2em;font-size:1.05em}.introduction-section strong{font-weight:600;color:var(--body-text)}.categories-grid{display:grid;grid-template-columns:1fr;gap:1rem}.categories-grid .category-card{background-color:var(--card-bg);border-radius:2rem;padding:1rem;box-shadow:0 5px 15px var(--card-shadow);display:flex;flex-direction:column;gap:1rem}.categories-grid .category-card .category-title{line-height:1}.categories-grid .category-card .category-description{padding-bottom:1rem;border-bottom:1px solid var(--card-border)}.categories-grid .category-card .modes-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:.5rem}.categories-grid .category-card .modes-grid .mode-card{background-color:var(--card-bg);padding:1rem;border-radius:1rem;box-shadow:0 5px 15px var(--card-shadow);text-decoration:none;color:inherit}.step-by-step{--bor: var(--card-border);--bdr: 2rem;--pad: 1rem;box-sizing:border-box;background-color:var(--card-bg);padding:1rem;border:solid 1px var(--card-border);border-radius:2rem;display:flex;flex-direction:column;gap:var(--pad)}.step-by-step .divider{border:none;height:1px;background-color:var(--bor)}.step-by-step .step{box-sizing:border-box;background-color:var(--card-bg)}.step-by-step .step:not(:has(.step-question-choices .step-question-radio:checked)) .correct-explanation{display:none}.step-by-step .step .step-question-choices{display:flex;flex-direction:column;gap:1rem;padding:1rem;border:solid 1px var(--card-border);border-radius:1rem}.step-by-step .step .step-question-choices:has(.step-question-choice>.step-question-radio:checked) .step-question-choice:has(.step-question-radio.correct:checked){background-color:#91ee91}.step-by-step .step .step-question-choices:has(.step-question-choice>.step-question-radio:checked) .step-question-choice:has(.step-question-radio.correct){background-color:#91ee9180}.step-by-step .step .step-question-choices:has(.step-question-choice>.step-question-radio:checked) .step-question-choice:has(.step-question-radio:not(.correct):checked){background-color:#f99}.step-by-step .step .step-question-choices:has(.step-question-choice>.step-question-radio:checked) .step-question-choice:has(.step-question-radio:not(.correct)){background-color:#ff999980}.step-by-step .step .step-question-choices .step-question-choice{position:relative;background-color:var(--card-bg);cursor:pointer;border-radius:100dvw;padding-inline:1ex}.step-by-step .step .step-question-choices .step-question-choice:hover{background-color:#add8e6}.step-by-step .step .step-question-choices .step-question-choice .step-question-radio{visibility:hidden;position:absolute;width:0;height:0;top:-1px;left:-1px}