*{box-sizing:border-box}.flashcards-banner{background:linear-gradient(115deg,#102935,#183b43);color:#fff5df;border:1px solid #557076;border-top:3px solid #ddbf77;border-radius:13px;padding:23px;margin-bottom:24px;box-shadow:0 8px 20px #0e253512}.flashcards-heading{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:19px}.fc-eyebrow{font:750 10px/1.4 system-ui;letter-spacing:2.5px;color:#a9c8c7}.flashcards-heading h2{font:800 32px/1.12 system-ui;letter-spacing:-1px;color:#fff5df;margin:5px 0 7px;display:flex;align-items:center;gap:14px}.stack-symbol{font-size:32px;color:#dec386;transform:rotate(-12deg)}.flashcards-heading p{font:14px/1.5 system-ui;color:#c0d1cf;margin:0}.six-sets{font:750 10px/1.4 system-ui;letter-spacing:1.5px;border:1px solid #668181;border-radius:20px;padding:8px 11px;white-space:nowrap;color:#dcc795}.deck-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}.deck-button{display:flex;align-items:center;gap:11px;padding:15px 12px;border:1px solid #587477;border-radius:8px;background:#ffffff08;color:#fff6df;text-decoration:none;min-height:82px;transition:background .15s,transform .15s}.deck-button:hover{background:#ffffff16;border-color:#dfc079;transform:translateY(-2px)}.deck-button:focus-visible{outline:3px solid #f6dc95;outline-offset:3px}.deck-mark{display:grid;place-items:center;flex:0 0 34px;height:37px;border:1px solid #738e8e;border-radius:4px 7px 7px 4px;background:#203f47;font:750 15px system-ui;color:#cbe1dd;box-shadow:-3px 0 0 #adc4bf50}.deck-button strong{display:block;font:750 13px/1.3 system-ui}.deck-button small{display:block;font:650 8px/1.4 system-ui;letter-spacing:.8px;color:#adc4c3;margin-top:5px}.deck-arrow{font-size:17px;margin-left:auto;color:#d6c18c}.deck-button.brain-brawl{background:#d0b16b20;border-color:#bda368}.brain-brawl .deck-mark{color:#102b34;background:#e1c584;border-color:#e1c584}.manual .deck-mark{font-size:11px;color:#eedfac}.banner-foot{display:flex;justify-content:space-between;gap:12px;margin-top:16px;color:#b5cdcb;font:11px/1.5 system-ui}.study-main{max-width:1140px;padding:30px 28px 60px;margin:auto}.study-back{font:650 13px system-ui;color:#314536;text-decoration:none}.study-top{display:flex;justify-content:space-between;align-items:flex-start;gap:24px;margin:23px 0}.study-top h1{font:800 clamp(28px,4vw,43px)/1.12 system-ui;letter-spacing:-1.4px;margin:8px 0;color:#20332d}.study-top p{margin:9px 0 0;color:#62716a;font:15px/1.5 system-ui}.study-label{font:750 11px system-ui;letter-spacing:1.6px;color:#657860}.preview-note{font:13px/1.6 system-ui;color:#53655f;background:#e9eee5;border:1px solid #ced7c8;border-radius:7px;padding:10px 14px;margin-bottom:22px}.study-layout{display:grid;grid-template-columns:minmax(0,1fr) 290px;gap:24px;align-items:start}.study-game{background:#fffdf7;border:1px solid #ccd3c5;border-radius:12px;overflow:hidden}.study-controls{display:flex;gap:12px;align-items:end;flex-wrap:wrap;padding:20px;border-bottom:1px solid #dbe0d4;background:#f0f2e9}.study-controls label{font:700 12px system-ui;color:#405448}.study-controls select{display:block;margin-top:6px;padding:10px 12px;border:1px solid #bbc8b8;border-radius:6px;background:#fffef9;font:14px system-ui;color:#243d31}.study-controls button,.study-action{background:#203d36;color:#fff7e3;border:0;padding:12px 18px;font:750 13px system-ui;border-radius:6px;cursor:pointer}.card-area{padding:26px}.card-meta{display:flex;justify-content:space-between;gap:10px;font:700 10px system-ui;letter-spacing:1px;color:#748573}.card-area progress{width:100%;height:5px;accent-color:#637b60;margin:16px 0 25px}.study-question{font:750 clamp(21px,3vw,27px)/1.4 system-ui;color:#223a33;margin:0 0 22px;min-height:115px}.recall-hint{font:13px system-ui;color:#768577;margin:0 0 22px}.study-answer{border-top:1px solid #dbe2d5;padding-top:18px;margin-bottom:22px}.study-answer small{font:800 10px system-ui;color:#6d805c;letter-spacing:1.5px}.study-answer p{font:600 20px/1.5 system-ui;color:#304a36;margin:8px 0 12px}.source{font:12px/1.5 system-ui;color:#667759}.rating{display:flex;gap:10px}.rating button{flex:1;padding:13px 8px;border-radius:6px;border:1px solid #b6c6ae;background:#f0f3e8;color:#304a36;font:750 13px system-ui;cursor:pointer}.rating button:last-child{background:#dfeacb}.stats{display:flex;justify-content:space-around;border-top:1px solid #dde1d4;background:#f7f8f1;padding:18px;text-align:center}.stats b{display:block;font:800 23px system-ui;color:#345046}.stats span{font:700 9px system-ui;letter-spacing:1px;color:#7b8674}.textbook{border:1px solid #ccd3c5;border-radius:12px;overflow:hidden;background:#fffdf7}.book-cover{background:linear-gradient(135deg,#24414b,#102732);padding:26px;color:#f1dfb3;position:relative;min-height:170px}.book-cover:after{content:"";position:absolute;left:12px;top:0;bottom:0;width:1px;background:#82939555}.book-cover small{font:700 9px system-ui;letter-spacing:2px;color:#b1cbc9}.book-cover h2{font:800 26px/1.2 system-ui;max-width:220px;margin:15px 0 9px;color:#f1dfb3}.book-cover p{font:11px system-ui;color:#bacbc6;margin:0}.book-actions{padding:20px}.book-actions a{display:block;border-radius:6px;text-align:center;text-decoration:none;font:750 13px system-ui;padding:12px;margin-bottom:9px;background:#e2c685;color:#203b33;border:1px solid #c9b06f}.book-actions a:last-of-type{background:#fffdf7;border-color:#c5cebe}.book-actions p{font:12px/1.5 system-ui;color:#74816e;margin:13px 0 0}.other-decks{margin-top:23px;padding:17px;border:1px solid #d0d8c7;border-radius:10px}.other-decks h3{font:750 12px system-ui;margin:0 0 12px;color:#405846}.other-decks a{display:block;color:#586e58;text-decoration:none;font:13px/1.5 system-ui;padding:7px 0;border-bottom:1px solid #e0e4d8}.other-decks a:last-child{border:0}.results{text-align:center;padding:35px 20px}.results h2{font:800 28px system-ui;color:#263e34}.results p{font:15px/1.6 system-ui;color:#617159}.results button{margin:8px}.study-game [hidden]{display:none!important}@media(max-width:760px){.deck-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.flashcards-banner{padding:17px}.flashcards-heading h2{font-size:28px}.flashcards-heading p{font-size:12px}.six-sets{display:none}.deck-button{padding:12px 9px;gap:9px;min-height:83px}.deck-button strong{font-size:12px}.deck-button small{font-size:7px}.deck-mark{flex-basis:28px;height:34px;font-size:13px}.deck-arrow{display:none}.banner-foot{flex-direction:column;gap:3px;font-size:10px}.study-main{padding:24px 16px 40px}.study-layout{grid-template-columns:1fr}.study-top{margin:18px 0}.study-question{min-height:90px;font-size:23px}.study-controls{padding:16px;gap:10px}.card-area{padding:20px}.textbook{display:grid;grid-template-columns:1fr 1fr}.book-cover{padding:20px;min-height:170px}.book-cover h2{font-size:23px}.book-actions{padding:16px 12px}.book-actions a{font-size:12px;padding:11px 5px}.other-decks{margin-top:18px}.study-controls button{margin-left:auto}.study-controls select{max-width:150px}}