:root{--bg:#f7f2df;--ink:#315c58;--muted:#738675;--mint:#3e9b85;--gold:#a16e25;--line:#bfd1ad;--paper:#fffbee;--shadow:#cad7b5}*{box-sizing:border-box}html,body,#app{width:100%;height:100%;margin:0;overflow:hidden}body{background:var(--bg);color:var(--ink);font-family:Arial Rounded MT Bold,Hiragino Maru Gothic ProN,PingFang SC,system-ui,sans-serif}#app{display:flex;flex-direction:column;background:radial-gradient(ellipse at 12% 5%,#fffdf2,transparent 60%),var(--bg)}button{font:inherit;font-weight:700;cursor:pointer;color:var(--ink);border:2px solid var(--line);background:var(--paper);border-radius:14px;touch-action:none;box-shadow:0 3px 0 var(--shadow);transition:background .15s,transform .1s,box-shadow .1s}button:hover{border-color:#72b59a;background:#f1f8dd}button:focus-visible{outline:3px solid #eaa54d;outline-offset:4px}button:active,button.held{background:#c8e9cc;transform:translateY(3px);box-shadow:0 0 0 var(--shadow)}header{height:88px;padding:20px 5%;display:flex;align-items:center;justify-content:space-between;flex-shrink:0;gap:12px}.brand{display:flex;align-items:center;gap:12px;font-size:19px;font-weight:900;letter-spacing:2px}.mark{font-size:26px;letter-spacing:-9px;color:#dc9250;background:#ffdeb0;border-radius:12px;padding:4px 14px 8px 7px;transform:rotate(-9deg)}.brand small{display:block;color:var(--mint);font-size:8px;letter-spacing:3px;margin-top:4px}nav{position:relative;display:flex;align-items:center;gap:10px;z-index:10}nav button{width:34px;height:34px;font-size:12px}#progress{display:inline-flex;align-items:center;justify-content:center;min-width:92px;height:34px;padding:0 14px;border:2px solid #d6b477;border-radius:20px;background:#ffe8ac;color:var(--ink);font-size:11px;font-weight:800;letter-spacing:1px;box-shadow:0 3px #d8bd88;white-space:nowrap}#chooseLevel{width:118px;height:36px;border-radius:20px;color:var(--ink);letter-spacing:1px;background:#ffe8ac;border-color:#d6b477;box-shadow:0 3px #d8bd88}#levelPicker{position:absolute;top:48px;left:50%;transform:translate(-50%);display:grid;grid-template-columns:repeat(5,38px);gap:9px;padding:18px;background:#fffbee;border:2px solid #abc3a0;border-radius:22px;box-shadow:0 7px #b8cda6,0 15px 25px #45674420}#levelPicker[hidden]{display:none}#levelPicker button{width:38px;height:38px}#originalMode,.chapter-link{grid-column:1/-1;text-align:center;padding:10px;color:var(--mint);font-size:12px;font-weight:700;text-decoration:none;border-top:1px dashed var(--line)}nav button.active{background:#ffdda0;border-color:#ce9e58}nav button.done{color:#2b8d6c;border-color:#72b59a;background:#def1d4}nav span{color:var(--muted)}.tools{display:flex;gap:10px}.tools button{width:36px;height:36px;border-radius:50%;font-size:19px;color:var(--ink);background:#fffbee}.chapter{text-align:center;padding:4px 20px 12px;pointer-events:none;flex-shrink:0}.chapter>span{display:inline-block;font-size:9px;font-weight:800;letter-spacing:2px;color:#5d8163;background:#e3edcd;border-radius:20px;padding:6px 12px}h1{font-family:inherit;font-weight:900;font-size:30px;letter-spacing:2px;margin:12px 0 7px;color:var(--ink);text-shadow:0 2px 0 #fffef2}p{color:var(--muted);font-size:12px;letter-spacing:.5px;margin:0;line-height:1.8}main{position:relative;flex:1;min-height:100px;margin:0 3%;border:2px solid #c5d5ad;border-radius:30px;overflow:hidden;background:#eaf1d8;box-shadow:inset 0 3px #ffffff70,0 4px #dce4c4}canvas{display:block;width:100%;height:100%;touch-action:none}footer{padding:12px 5% 18px;flex-shrink:0}.hint{display:flex;align-items:center;justify-content:center;gap:9px;font-size:12px;color:#56775c;min-height:28px;text-align:center;line-height:1.7;letter-spacing:.3px;font-weight:600}.hint-dot{width:7px;height:7px;flex-shrink:0;background:#e4a34c;border-radius:50%;border:1px solid #b37d36}.controls{display:flex;justify-content:center;align-items:center;gap:10px;margin-top:9px}.controls button{height:44px;min-width:48px;padding:0 18px;font-size:17px;border-radius:14px}.controls button.primary,.drive.primary{border-color:#84b49b;color:#276f5e;background:#daf0d4;box-shadow:0 3px #a8c69b}.drive{min-width:133px}.drive span{font-size:18px;margin-right:8px}kbd{font-family:inherit;font-size:9px;border:1px solid #b5c6a4;background:#f0f3dd;padding:1px 4px;border-radius:4px;color:#6c856c;margin-left:12px}.footnote{display:flex;justify-content:space-between;margin-top:19px;font-size:9px;letter-spacing:1px;color:#8c9c7a}#toast{position:absolute;bottom:12px;left:50%;transform:translate(-50%);font-size:11px;color:#6d702c;background:#fff7d6e8;border-radius:20px;padding:5px 11px;max-width:94%;text-align:center;pointer-events:none;box-shadow:0 2px #d7d6ad70}#toast:empty{display:none}#overlay{position:absolute;top:0;right:0;bottom:0;left:0;display:grid;place-items:center;background:#eaf1d8c9;-webkit-backdrop-filter:blur(5px);backdrop-filter:blur(5px);z-index:3}#overlay[hidden]{display:none}.modal{text-align:center;padding:25px 30px;border:3px solid #a9c198;border-radius:28px;background:#fffbed;box-shadow:0 7px #b7cca3,0 16px 35px #5d78462b;max-width:92%}.modal>span{font-size:9px;letter-spacing:2px;font-weight:800;color:var(--mint)}.modal h2{font-family:inherit;font-weight:900;font-size:27px;letter-spacing:1px;margin:15px 0;color:var(--ink)}.modal p{margin-bottom:19px}.modal button{padding:11px 18px;margin:4px;font-size:12px}#primary{border-color:#78aa8e;color:#325d4b;background:#d9efc6}@media(max-width:600px){header{height:74px;padding:16px 4%;gap:8px}.brand{font-size:13px;letter-spacing:1px;gap:5px;flex-shrink:0}.brand small{font-size:5px;letter-spacing:1px}.mark{display:none}nav{gap:4px}#chooseLevel{width:108px;height:32px;font-size:10px}nav span{display:none}.tools{gap:6px}.tools button{width:29px;height:30px;font-size:16px}.chapter{padding:4px 14px 12px}.chapter>span{font-size:8px;letter-spacing:1px;padding:5px 10px}h1{font-size:25px;margin:11px 0 6px;letter-spacing:1px}.chapter p{font-size:9px;letter-spacing:1.5px}main{margin:0 3%;border-radius:24px}footer{padding:10px 5% 17px}.controls{gap:7px;flex-wrap:wrap}.controls button{padding:0 12px;height:46px}.hint{font-size:11px}.drive{min-width:116px}kbd{display:none}.footnote{font-size:8px;letter-spacing:0;margin-top:18px}#restart{min-width:40px}}@media(max-height:580px)and (min-width:601px){header{height:58px;padding:10px 5%}.chapter{padding:0 20px 8px}.chapter>span{padding:3px 10px}.chapter h1{font-size:22px;margin:5px}.chapter p{display:none}footer{padding:7px 5% 12px}.footnote{display:none}.hint{min-height:20px}.controls{margin-top:4px}}@media(prefers-reduced-motion:reduce){button{transition:none}}