.number-activity{padding-bottom:56px}.activity-heading{text-align:center;padding:28px 12px 24px}.activity-kicker{display:inline-block;color:#438b2b;background:#eaf7de;padding:7px 14px;border-radius:20px;font-weight:700}.activity-heading h1{color:#203b70;font-size:clamp(28px,4vw,42px);margin:12px 0 6px}.activity-heading p{color:#4b6288;margin:0}.book-viewer{max-width:1120px;margin:0 auto;background:#fff;border:1px solid #e1eaf3;border-radius:24px;padding:18px;box-shadow:0 12px 32px #243b6815}.page-count{display:flex;justify-content:space-between;align-items:center;color:#294474;font-weight:700;padding:2px 4px 14px}.page-count span:first-child{font-size:14px;color:#548b33}.book-page{overflow:hidden;border-radius:16px;background:#f4f8fc;line-height:0}.book-page img{width:100%;height:auto;display:block}.activity-controls{display:flex;align-items:center;gap:16px;padding:18px 2px 4px}.activity-controls button,.finish-panel button{border:0;border-radius:999px;padding:12px 22px;font:700 15px Poppins, sans-serif;background:#356ce0;color:#fff;cursor:pointer;white-space:nowrap}.activity-controls button:disabled{background:#dce4ed;color:#8090a7;cursor:not-allowed}.progress-track{height:9px;border-radius:8px;background:#e8eef5;flex:1;overflow:hidden}.progress-track span{display:block;height:100%;width:14.285%;background:linear-gradient(90deg,#55b332,#83ca45);border-radius:8px;transition:width .25s}.activity-note{text-align:center;color:#697d99;font-size:13px;margin:17px 0 2px}.activity-feedback{text-align:center;min-height:0;color:#294474;font-weight:700;margin-top:12px}.quiz-area{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;margin:18px 0 4px}.quiz-card{border:3px solid #e3eaf4;background:#f7faff;border-radius:18px;padding:14px;text-align:center;transition:background .2s,border-color .2s}.quiz-card h3{font-size:15px;color:#244376;margin:0 0 10px}.quiz-options{display:flex;justify-content:center;gap:9px}.quiz-options button{border:2px solid #d6e1ed;background:#fff;color:#204a91;border-radius:12px;min-width:48px;padding:9px 12px;font:800 19px Poppins,sans-serif;cursor:pointer}.quiz-options button:hover{border-color:#3971e2;transform:translateY(-1px)}.quiz-card.correct{background:#e7f8e9;border-color:#42a957}.quiz-card.wrong{background:#fff0ef;border-color:#e35c56}.quiz-options button:focus-visible,.activity-controls button:focus-visible{outline:3px solid #ffbf31;outline-offset:3px}.finish-panel{margin:18px 0 0;padding:20px;background:#eef9e9;border-radius:18px;text-align:center;color:#28522a}.finish-panel strong{font-size:22px}.finish-panel a{margin-left:14px;color:#2352a5;font-weight:700}@media(max-width:680px){.number-activity{padding:0 14px 36px}.activity-heading{padding:18px 4px}.book-viewer{padding:10px;border-radius:17px}.page-count{align-items:flex-start;gap:6px;flex-direction:column}.activity-controls{gap:8px}.activity-controls button{padding:11px 13px;font-size:13px}.quiz-area{grid-template-columns:1fr;gap:9px}.quiz-card{padding:12px}.activity-note{font-size:12px}.finish-panel a{display:block;margin:12px 0 0}}@media print{header,.learn-breadcrumb,.activity-heading,.activity-controls,.quiz-area,.activity-feedback,.activity-note,.site-footer-art,.finish-panel{display:none!important}.number-activity,.book-viewer{width:100%;max-width:none;margin:0;padding:0;border:0;box-shadow:none}.book-page img{width:100%;page-break-after:always}.page-count{display:none}}
[hidden]{display:none!important}.book-page{position:relative}.book-page .corner-repair{position:absolute;inset:0;width:100%;height:100%;pointer-events:none}.repair-left{clip-path:inset(87% 82% 0 0)}.repair-right{clip-path:inset(87% 0 0 82%)}.start-art{position:absolute;left:51%;top:83%;width:39%;height:15%;border:0;border-radius:14px;background:transparent;cursor:pointer}.start-art:focus-visible{outline:4px solid #fff;outline-offset:-4px}.quiz-card{display:flex;align-items:center;gap:12px;text-align:center}.quiz-number{flex:0 0 35px;height:35px;border-radius:50%;display:grid;place-items:center;background:#356ce0;color:#fff;font-size:19px;font-weight:800}.quiz-content{flex:1;min-width:0}.quiz-options{flex-wrap:wrap}.quiz-options button{font-size:16px;padding:10px}.quiz-result{font-size:13px;min-height:21px;margin:8px 0 0;color:#284274}.quiz-card.correct .quiz-number{background:#258a3a}.quiz-card.wrong .quiz-number{background:#bd3831}.quiz-options button[aria-pressed=true]{outline:3px solid currentColor;outline-offset:1px}.material-grid{max-width:1120px;margin:0 auto;display:grid;grid-template-columns:1fr 1fr;gap:26px}.material-card{display:block;background:#fff;border:2px solid #e2edf5;border-radius:24px;overflow:hidden;color:#233f73;text-decoration:none;box-shadow:0 8px 24px #2944740c;transition:transform .18s}.material-card:hover{transform:translateY(-4px)}.material-card>img{display:block;width:100%;aspect-ratio:3/2;object-fit:cover}.material-copy{padding:24px}.material-copy h2{margin:12px 0;font-size:26px}.material-copy p{margin:0 0 20px;font-size:16px;line-height:1.6}.material-cta{display:inline-block;border-radius:24px;background:#356ce0;color:white;padding:12px 18px;font-weight:700}.choose-back{display:block;max-width:1120px;margin:0 auto 16px;color:#285bc2;font-weight:700}.activity-controls button{min-height:46px}#image-error{padding:16px;background:#fff0df;color:#75451e;border-radius:12px}@media(max-width:900px){.quiz-area{grid-template-columns:1fr}.quiz-options button{min-width:54px}}@media(max-width:680px){.material-grid{grid-template-columns:1fr}.material-copy{padding:20px}.material-copy h2{font-size:23px}.quiz-number{flex-basis:36px}.quiz-options{gap:12px}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}
.material-card>img{aspect-ratio:4/3;object-fit:contain;background:#eff8ff}.book-viewer{scroll-margin-top:20px}

.back-aprender{display:table;margin:0 0 20px;padding:12px 18px;border-radius:24px;background:#356ce0;color:white;font-weight:700;text-decoration:none}.back-aprender:focus-visible{outline:3px solid #ffbf31;outline-offset:3px}.quiz-area:has(.quiz-card:only-child){grid-template-columns:1fr}.quiz-area:has(.quiz-card:nth-child(4)){grid-template-columns:repeat(2,minmax(0,1fr))}@media(max-width:680px){.quiz-area:has(.quiz-card:nth-child(4)){grid-template-columns:1fr}}