:root{--ink:#244d4a;--muted:#677d74;--paper:#f6f2e9;--orange:#e67748}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font-family:system-ui,-apple-system,"Noto Sans JP",sans-serif}main{max-width:1080px;margin:auto;padding:24px 32px}header{display:flex;justify-content:space-between;align-items:center}.brand{text-decoration:none;font-weight:900;font-size:22px;color:var(--ink)}.brand span{display:block;font-size:10px;letter-spacing:3px;margin:5px 0 0 31px}button{font:inherit;cursor:pointer;border:0;color:var(--ink);touch-action:manipulation}button:focus-visible,a:focus-visible{outline:3px solid #e67748;outline-offset:4px}.small{background:#e8e8dc;border:1px solid #d7dbcd;border-radius:9px;padding:8px 12px;font-size:12px}.small:disabled{opacity:.4;cursor:default}.intro{padding:42px 0 28px;display:grid;grid-template-columns:1fr 1fr}.label{grid-column:1/-1;font-size:12px;letter-spacing:2px}h1{font-size:clamp(32px,5vw,54px);line-height:1.25;margin:14px 0;font-weight:850;letter-spacing:-2px}.intro p{align-self:end;line-height:1.9;color:var(--muted);font-size:14px;margin-bottom:18px}.game-shell{background:#fffaf1;border-radius:20px;overflow:hidden;border:1px solid #d7dfd3;box-shadow:0 14px 40px #294d4010}.dashboard{display:flex;align-items:center;justify-content:space-between;padding:15px 20px;font-size:12px;gap:8px}.dashboard b{font-size:17px}.sep{margin:0 8px;color:#a4afa2}.progress{height:4px;background:#e6eada}.progress i{height:4px;display:block;width:0;background:var(--orange)}.canvas-wrap{position:relative;background:#dceddb}canvas{width:100%;display:block;aspect-ratio:900/480;touch-action:none}#overlay{position:absolute;inset:0;display:grid;place-items:center;background:#dceddb35}.overlay-card{text-align:center;background:#fffaf1ed;padding:25px 34px;border:1px solid #fff;border-radius:20px;box-shadow:0 10px 35px #244d4a10;max-width:90%}#tag{font-size:11px;letter-spacing:2px;color:var(--orange);font-weight:800}h2{font-size:30px;margin:10px 0}#message{font-size:13px;line-height:1.8;margin:10px 0 16px}#routes{display:flex;justify-content:center;gap:6px;margin:12px 0 18px}#routes button{padding:8px 12px;border-radius:8px;font-size:12px;background:#eeeee2}.selected{background:#244d4a!important;color:white}.primary{background:var(--orange);color:#fff;padding:13px 30px;border-radius:10px;font-weight:800}.hint{font-size:10px;color:var(--muted);margin:12px 0 0}.jump{display:flex;justify-content:center;align-items:center;gap:28px;width:100%;padding:15px;background:#244d4a;color:white;font-weight:750;font-size:15px}.jump span{font-size:22px}.jump:disabled{background:#80958a}.status{font-size:12px;text-align:center;margin:0;padding:10px;color:var(--muted);min-height:38px}.notes{display:grid;grid-template-columns:repeat(3,1fr);gap:35px;margin:32px 0}.notes span{font-size:10px;letter-spacing:2px;color:var(--orange)}.notes h3{font-size:15px}.notes p{font-size:12px;color:var(--muted);line-height:1.9}footer{padding:22px 0;border-top:1px solid #d8dfd1;font-size:10px;color:var(--muted);display:flex;justify-content:space-between}@media(max-width:600px){main{padding:20px 14px}.intro{display:block;padding:28px 4px 20px}h1{font-size:36px;margin:12px 0}.intro p{font-size:12px;margin:12px 0 0}.dashboard{padding:12px 10px;font-size:10px}.dashboard b{font-size:14px}.sep{margin:0 3px}.small{font-size:10px;padding:7px 8px}canvas{aspect-ratio:900/650;height:320px}h2{font-size:25px}.overlay-card{padding:18px 20px}#message{font-size:12px;margin:8px 0}#routes{margin:10px 0}.notes{gap:16px;grid-template-columns:1fr;margin:24px 8px}.notes h3{margin:7px 0}.notes p{margin:0}footer{display:block;line-height:2}footer span{display:block}.desktop{display:none}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto}}

#challenge-controls{margin:12px 0;font-size:12px}#challenge-controls label{display:inline-flex;align-items:center;gap:8px}#challenge{width:92px;padding:7px;border:1px solid #bdcdc0;border-radius:7px;font:inherit;color:var(--ink);background:white}#target{font-size:11px;color:var(--orange);margin:7px 0}#new-course{margin-left:5px}.share{margin-top:10px;border:1px solid #244d4a;border-radius:9px;background:transparent;padding:10px 16px;font-size:12px;font-weight:700}#share-text{width:95%;margin:10px 2.5%;min-height:100px;font:inherit;font-size:12px}.overlay-card{padding:18px 24px}#overlay{overflow:auto}#result-actions[hidden]{display:none}@media(max-width:600px){canvas{height:360px}.overlay-card{padding:14px 16px}#message{font-size:11px}.hint{margin-top:8px}#challenge-controls{margin:9px 0}}