:root{font-family:'Trebuchet MS',Arial,sans-serif;color:#173e2c;background:#f5f5e9;font-size:18px}*{box-sizing:border-box}body{margin:0}main{max-width:1080px;margin:auto;padding:26px}header{display:flex;align-items:center;justify-content:space-between;gap:18px;font-weight:bold}a{color:#245c3d}header a{text-decoration:none}header span{font-size:1.15rem}h1{font-size:clamp(2rem,4vw,3rem);text-align:center;margin:34px 0 12px;line-height:1.15}.intro{text-align:center;max-width:730px;margin:0 auto 25px;font-size:1.15rem;line-height:1.5}button{font:inherit;cursor:pointer;touch-action:manipulation}button:focus-visible,a:focus-visible{outline:4px solid #315ed3;outline-offset:4px}[hidden]{display:none!important}.scorebar{display:flex;justify-content:space-between;align-items:center;gap:15px;flex-wrap:wrap;margin:20px auto;max-width:820px;font-size:1.05rem}.scorebar strong{font-size:1.3rem}.secondary{padding:12px 18px;background:#fffef7;border:2px solid #b5c79f;border-radius:14px;color:inherit;min-height:48px;font-weight:bold}.status{min-height:2.8em;text-align:center;font-size:1.05rem;line-height:1.4;margin:16px 0}.memory-board{display:grid;grid-template-columns:repeat(6,1fr);gap:12px;max-width:850px;margin:auto}.memory-card{aspect-ratio:1;border:3px solid #386b3e;border-bottom-width:6px;background:#327448;border-radius:22px;position:relative;color:#fff;min-width:0;padding:10px;transition:background .15s}.memory-card:hover:not(:disabled){background:#265e3a}.card-back{display:flex;align-items:center;justify-content:center;inset:0;position:absolute;font-size:3rem;font-weight:bold;color:#e6f29b}.card-face{display:none;align-items:center;justify-content:center;position:absolute;inset:8px;font-size:3.7rem}.card-face img{height:100%;width:100%;object-fit:contain}.memory-card.revealed{background:#fffef4;border-color:#d4b752}.revealed .card-back{display:none}.revealed .card-face{display:flex}.memory-card.matched{background:#e6f3cb;border-color:#71a34b;cursor:default}.memory-card.matched:after{content:'✓';position:absolute;right:5px;bottom:3px;color:#215d33;font-weight:bold;font-size:1.2rem;background:#e6f3cb;border-radius:50%;padding:0 4px}.puzzle-layout{display:grid;grid-template-columns:minmax(0,3fr) minmax(150px,1fr);gap:25px;align-items:start}.puzzle-board{display:grid;grid-template-columns:repeat(6,1fr);grid-template-rows:repeat(4,1fr);aspect-ratio:1672/941;gap:4px;padding:6px;background:#c4d2ae;border-radius:15px;overflow:hidden}.puzzle-tile{background-image:url('/assets/dinosaurs.png');background-size:600% 400%;background-repeat:no-repeat;border:0;padding:0;min-width:0;min-height:0;position:relative;border-radius:4px}.puzzle-tile.picked{outline:5px solid #ffdf39;outline-offset:-5px;z-index:1}.puzzle-tile.picked:after{content:'✓';position:absolute;top:5px;right:5px;background:#ffdf39;color:#173e2c;border-radius:50%;font-weight:bold;padding:3px 7px}.puzzle-tile:disabled{cursor:default}.puzzle-tile:focus-visible{outline-offset:-5px;z-index:2}.sample{margin:0}.sample img{width:100%;border:4px solid #d5dfc3;border-radius:15px;display:block}.sample figcaption{font-size:.95rem;font-weight:bold;margin-bottom:12px}.sample p{font-size:.9rem;line-height:1.5;color:#526847}.result{max-width:680px;margin:25px auto 0;text-align:center;padding:25px;background:#e5efcb;border-radius:24px;border:2px solid #c5d5a7}.result .medal{font-size:3rem}.result h2{font-size:1.7rem;margin:12px 0}.result h2:focus{outline:none}.result p{line-height:1.5;font-size:1.1rem}.primary{display:inline-block;text-decoration:none;border:0;border-bottom:5px solid #113e27;background:#245c3d;color:white;border-radius:16px;font-weight:bold;font-size:1.1rem;padding:16px 24px;min-height:60px}.result a{display:block;margin-top:18px}footer{text-align:center;margin-top:36px;border-top:1px solid #d5dfc5;padding-top:20px;font-size:.85rem;line-height:1.8}footer nav{display:flex;justify-content:center;gap:15px;flex-wrap:wrap}@media(max-width:600px){main{padding:18px}header{font-size:.9rem}header span{font-size:1rem}h1{margin-top:25px}.intro{font-size:1.05rem}.memory-board{grid-template-columns:repeat(4,1fr);gap:7px}.memory-card{border-radius:16px}.card-back{font-size:2.6rem}.card-face{font-size:2.8rem}.scorebar{gap:10px;font-size:.9rem}.scorebar strong{font-size:1.05rem}.scorebar button{font-size:.9rem;padding:10px}.puzzle-layout{display:flex;flex-direction:column;gap:20px}.puzzle-board{width:100%;min-height:220px;gap:2px;padding:3px}.sample{display:grid;grid-template-columns:130px 1fr;gap:8px 15px}.sample figcaption{grid-column:1/-1;margin:0}.sample p{margin:0}.status{font-size:1rem}.result{padding:20px}.result .primary{width:100%}}@media(prefers-reduced-motion:reduce){*{transition:none!important}}

.puzzle-choices{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;max-width:760px;margin:20px auto}.puzzle-choice{border:3px solid #c5d5a7;background:#fffef4;color:#173e2c;border-radius:15px;padding:6px;font-weight:bold}.puzzle-choice img{width:100%;aspect-ratio:16/9;object-fit:cover;border-radius:9px;display:block;margin-bottom:8px}.puzzle-choice[aria-pressed="true"]{border-color:#367738;background:#e4f3c5;box-shadow:0 0 0 2px #367738}.puzzle-choice span{display:block;padding:5px}@media(max-width:600px){.puzzle-choices{gap:8px}.puzzle-choice{font-size:.8rem}.memory-card{padding:4px}.card-face{inset:3px}}