:root{--ink:#293f3d;--teal:#25615a;--paper:#fffdf7;--line:#c7d2c4;--sand:#f3eee0}*{box-sizing:border-box}body{margin:0;background:var(--sand);color:var(--ink);font:17px/1.65 system-ui,-apple-system,"Noto Sans JP",sans-serif}button,input,select{font:inherit;color:inherit}button,select{border:1px solid #9cac9b;border-radius:12px;background:var(--paper);padding:10px 14px;min-height:48px}button{font-weight:650;cursor:pointer}button:hover:not(:disabled){background:#e2eee6}button:disabled{opacity:.45;cursor:default}button:focus-visible,a:focus-visible,select:focus-visible{outline:3px solid #be4f29;outline-offset:3px}a{color:var(--teal)}[hidden]{display:none!important}main{max-width:1160px;margin:auto;padding:28px 24px}h1{font-size:clamp(2.3rem,5vw,3.8rem);line-height:1.3;margin:16px 0}h2{font-size:1.65rem;margin:0 0 8px}h3{font-size:1.1rem;margin:0 0 8px}p{margin:8px 0 16px}small,.small{font-size:.85rem}small{display:block;font-weight:400}.eyebrow{color:var(--teal);font-weight:650;letter-spacing:.1em}.lead{font-size:1.55rem;font-weight:650}#home{position:relative;padding:20px 0}.home-art{position:absolute;right:5%;top:20px;display:flex;align-items:end;gap:8px;font:50px/1.05 monospace;color:#b3763f;transform:skewY(-10deg);background:#eadfc8;padding:25px;border-radius:35%}.mode-cards{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin:32px 0}.mode-cards>button,.challenge-card{padding:24px;border-radius:20px;border:1px solid var(--line);background:var(--paper)}.mode-cards strong{font-size:1.4rem}.challenge-card{display:grid;gap:10px;background:#e0ebe0}.challenge-card select{width:100%}.primary{background:var(--teal);color:white;border-color:var(--teal)}button.primary:hover:not(:disabled){background:#164940}.draft-note{font-size:.8rem}.section-top{display:flex;gap:16px;align-items:center;flex-wrap:wrap;margin-bottom:22px}#counter{margin-left:auto}.scenes{display:grid;grid-template-columns:1fr 1fr;gap:16px}.scenes.free{grid-template-columns:1fr}.scene-card{border:1px solid var(--line);background:var(--paper);border-radius:18px;overflow:hidden}.scene-card h3{padding:12px 18px;margin:0;border-bottom:1px solid var(--line)}.scene-card p{padding:8px 14px;margin:0;font-size:.85rem}#block-count{font-size:.85rem;font-weight:400}.viewer{height:340px;background:radial-gradient(#b9c6b4 1px,transparent 1px);background-size:22px 22px}.viewer canvas{display:block;width:100%;height:100%;touch-action:none}.controls{display:grid;grid-template-columns:1fr 1fr;gap:24px;margin-top:18px}.placement,.observation{background:var(--paper);border:1px solid var(--line);border-radius:18px;padding:20px}.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:7px}.grid button{min-height:68px;padding:6px 3px;border:2px solid #b5bfad}.grid button span{display:block;font-size:.72rem;font-weight:400}.grid button[aria-pressed=true]{border:3px solid var(--teal);background:#e0eee3;box-shadow:inset 0 0 0 2px white}.grid button.hint{outline:3px dashed #be4f29;outline-offset:-5px}.front-label{text-align:center;font-weight:750;color:var(--teal)}.actions,.rotation{display:flex;flex-wrap:wrap;gap:7px;margin:10px 0}.actions>*{flex:1}.rotation>*{flex:1;padding:9px}.wide{width:100%;margin-top:12px}.success{border:2px solid var(--teal);background:#dfefdc;padding:18px;margin-top:16px;border-radius:14px;text-align:center;font-size:clamp(1.2rem,2.5vw,1.7rem);font-weight:750}#feedback:not(:empty),#hint-text:not(:empty){padding:12px;border-left:4px solid #a76532;background:#fff0d6;border-radius:6px}.notice{padding:18px;border:1px solid var(--line);background:var(--paper);border-radius:14px;margin:20px 0}.notice a{margin-left:12px}.result-list{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:24px 0}.result-card{background:var(--paper);border:1px solid var(--line);border-radius:18px;padding:15px;text-align:center}.result-card svg{width:100%;height:150px}.result-card p{font-size:.85rem}.stamp{font-weight:750;color:var(--teal);font-size:1.2rem}.tabs{display:none}footer{border-top:1px solid var(--line);margin-top:32px;padding:18px 0;display:flex;gap:12px 20px;flex-wrap:wrap;font-size:.8rem}
@media(max-width:650px){main{padding:20px 16px}.home-art{display:none}.mode-cards,.controls{grid-template-columns:1fr;gap:14px}.mode-cards{margin-top:22px}.scenes{grid-template-columns:1fr}.tabs{display:flex;gap:8px;margin:10px 0}.tabs>*{flex:1}.tabs [aria-pressed=true]{background:var(--teal);color:white}.scenes[data-mobile=mine] #target-panel,.scenes[data-mobile=target] #mine-panel{display:none}.viewer{height:310px}.placement,.observation{padding:16px}.grid button{font-size:.95rem}.actions>button{padding:9px 6px;font-size:.92rem}.section-top{gap:9px;font-size:.9rem}.result-list{grid-template-columns:1fr 1fr;gap:10px}.result-card{padding:10px}.result-card button{font-size:.85rem;padding:8px}.result-card svg{height:120px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}
.direct-tools{display:flex;gap:6px;padding:8px 10px 4px}.direct-tools button{flex:1;min-width:0;padding:8px 3px;font-size:.85rem;white-space:nowrap}.direct-tools [aria-pressed=true]{background:var(--teal);color:white;box-shadow:inset 0 0 0 2px white;outline:2px solid var(--teal);outline-offset:-2px}#mine-view canvas{cursor:crosshair}#direct-status{min-height:34px;color:var(--teal);font-weight:650}.viewer{height:280px}.direct-bar{background:var(--paper);border:1px solid var(--line);border-radius:14px;margin:10px 0}.direct-bar p{padding:4px 12px;margin:0}.direct-bar .direct-tools{max-width:570px}
@media(max-width:650px) and (min-height:650px){.scenes{position:sticky;top:64px;z-index:5}.viewer{height:clamp(155px,26vh,225px)}.scene-card h3{padding:7px 14px}.scene-card p{padding:4px 14px}.scenes{filter:drop-shadow(0 3px 3px #293f3d18)}}