.edu-activity-panel{max-width:820px;margin:24px auto 8px;background:var(--card-bg,#fff);border:1px solid var(--border,#ddd);border-top:4px solid var(--section-color,var(--accent));border-radius:12px;padding:clamp(18px,3vw,30px);box-shadow:0 4px 18px rgba(0,0,0,.05)}
.edu-activity-progress{margin:0 0 14px;color:var(--text-secondary,#555);font-size:.82rem;font-weight:700;letter-spacing:.04em;text-transform:uppercase}
.edu-activity-question fieldset{min-width:0;margin:0;padding:0;border:0}
.edu-activity-prompt{display:block;margin:0 0 18px;padding:0;color:var(--text,#222);font:700 1.2rem/1.45 'Source Serif 4',serif}
.edu-activity-option{display:flex;align-items:flex-start;gap:10px;margin:9px 0;padding:12px 14px;border:1px solid var(--border,#ddd);border-radius:9px;line-height:1.5;cursor:pointer;background:#fff}
.edu-activity-option:hover{border-color:var(--section-color,var(--accent));background:#f8fbff}
.edu-activity-option input{flex:0 0 auto;margin-top:4px;accent-color:var(--section-color,var(--accent))}
.edu-activity-option.is-correct{border-color:#2e7d32;background:#f1f8f2}
.edu-activity-option.is-incorrect{border-color:#b71c1c;background:#fff5f5}
.edu-activity-feedback{min-height:1.5em;margin:14px 0 4px;line-height:1.6}
.edu-activity-feedback a{font-weight:700;color:var(--link,#1565c0)}
.edu-feedback-correct{color:#1b5e20}.edu-feedback-incorrect{color:#9c1c1c}
.edu-activity-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:16px}
.edu-activity-button{display:inline-flex;align-items:center;justify-content:center;min-height:42px;padding:10px 18px;border:1px solid var(--section-color,var(--accent));border-radius:8px;background:var(--section-color,var(--accent));color:#fff;font:700 .88rem 'DM Sans',sans-serif;cursor:pointer}
.edu-activity-button:hover{filter:brightness(.92)}.edu-activity-button:focus-visible,.edu-activity-option:focus-within{outline:3px solid #ffb300;outline-offset:2px}
.edu-activity-button-secondary{background:#fff;color:var(--section-color,var(--accent))}
.edu-activity-result{text-align:center;padding:14px 4px 6px}.edu-activity-score{margin:0 0 8px;font:700 1.7rem 'Source Serif 4',serif;color:var(--section-color,var(--accent))}.edu-activity-result p:not(.edu-activity-score){line-height:1.6}
@media(max-width:560px){.edu-activity-panel{padding:17px}}

.edu-activity-share{max-width:820px;margin:14px auto 22px;display:flex;gap:12px;flex-wrap:wrap;align-items:center;line-height:1.5}
.edu-activity-share summary{font-weight:700;cursor:pointer;padding:10px;border:1px solid #c6d5e5;border-radius:8px;background:#fff;color:#174c7c;min-height:44px}
.edu-activity-share a{color:#174c7c;font-weight:700;text-decoration:underline;text-underline-offset:3px}
.edu-activity-share summary:focus-visible,.edu-activity-share a:focus-visible{outline:3px solid #ffb300;outline-offset:3px}
.edu-share-choices{display:flex;flex-wrap:wrap;gap:16px;padding:12px 4px}
.edu-share-status{flex-basis:100%;font-size:.88rem;color:#37474f;overflow-wrap:anywhere}.edu-share-status:empty{display:none}
.edu-copy-fallback{display:block;width:100%;padding:10px;font:inherit;color:#174c7c}
.edu-result-title{font:700 clamp(1.5rem,4vw,2rem)/1.3 'Source Serif 4',serif;color:#174c7c;margin:6px 0 16px}
.edu-activity-result .edu-result-message{max-width:620px;margin:12px auto 20px;font-size:1.05rem}
.edu-result-resources{margin:16px 0 24px}.edu-result-resources a{color:#174c7c;font-weight:700;text-decoration:underline}
.edu-activity-perfect{background:linear-gradient(150deg,#fffbed,#f0f8ff);border:2px solid #e8b943;border-radius:14px;padding:24px 18px}
.edu-activity-perfect .edu-result-title{font-size:clamp(1.8rem,4.5vw,2.6rem)}
.edu-activity-perfect .edu-activity-score{font-size:2rem}.edu-result-star{display:block;font-size:4.5rem;line-height:1.1;color:#b57700}
.edu-activity-panel [id],.edu-activity-result{scroll-margin-top:calc(var(--rux-reading-offset,0px) + 18px)}
.edu-confetti{position:fixed;inset:0;overflow:hidden;pointer-events:none;z-index:9999}
.edu-confetti span{position:absolute;top:-30px;left:var(--confetti-x);width:9px;height:15px;border-radius:2px;animation:edu-confetti-fall 3.1s var(--confetti-delay) ease-in forwards}
@keyframes edu-confetti-fall{0%{transform:translate3d(0,-20px,0) rotate(0)}100%{transform:translate3d(var(--confetti-drift),calc(100vh + 50px),0) rotate(var(--confetti-turn));opacity:0}}
.edu-other-activities{padding:24px 0}.edu-other-activities ul{padding-left:24px}.edu-other-activities a{color:#174c7c;font-weight:700}
.edu-activity-page .content{padding-top:32px}.edu-activity-page .hero-bar .subtitle{margin-bottom:12px}.edu-activity-page .edu-activity-panel{margin-top:18px}
@media(prefers-reduced-motion:reduce){.edu-confetti{display:none}.edu-confetti span{animation:none}}

.edu-activity-group{margin:20px 0 40px}.edu-activity-group>h2{font:700 1.9rem/1.3 'Source Serif 4',serif;color:#174c7c;margin-bottom:12px}.edu-activity-group>p{margin-bottom:20px;color:#4b5967}
.edu-activity-accordion{border:1px solid #cddaea;border-radius:12px;background:#fff;margin-bottom:14px;overflow:clip}
.edu-accordion-summary{display:grid;grid-template-columns:26px minmax(0,1fr) auto 20px;align-items:center;gap:10px 12px;padding:20px;cursor:pointer;list-style:none;border-left:5px solid var(--section-color,#1565c0);background:#f4f8fd}
.edu-accordion-summary::-webkit-details-marker{display:none}.edu-accordion-summary h3{min-width:0;margin:0;color:#174c7c;font:700 1.25rem/1.4 'Source Serif 4',serif}.edu-accordion-summary .section-emoji{font-size:1.4rem}
.edu-accordion-meta{font-size:.82rem;font-weight:600;color:#4b5967}.edu-accordion-indicator{font-size:1.7rem;color:#174c7c;line-height:1;transition:transform .15s}
.edu-activity-accordion[open]>.edu-accordion-summary{border-bottom:1px solid #cddaea}.edu-activity-accordion[open]>.edu-accordion-summary .edu-accordion-indicator{transform:rotate(180deg)}
.edu-accordion-summary:hover{background:#eaf2fc}.edu-accordion-summary:focus-visible{outline:3px solid #ffb300;outline-offset:-3px}
.edu-accordion-content{padding:22px}.edu-accordion-content .section-intro{font-style:normal}.edu-accordion-content .edu-activity-panel{box-shadow:none;margin-top:18px}
@media(max-width:560px){.edu-accordion-summary{grid-template-columns:24px minmax(0,1fr) 20px;padding:16px 12px;gap:6px 8px}.edu-accordion-summary h3{grid-column:2;grid-row:1;font-size:1.16rem}.edu-accordion-meta{grid-column:2;grid-row:2}.edu-accordion-indicator{grid-column:3;grid-row:1 / span 2}.edu-accordion-summary .section-emoji{grid-column:1;grid-row:1}.edu-accordion-content{padding:16px 10px}.edu-accordion-content .edu-activity-panel{padding:15px 12px}}
@media(prefers-reduced-motion:reduce){.edu-accordion-indicator{transition:none}}