:root{--gb-dark: #0f380f;--gb-paper: #9bbc0f;--gb-ink: #0b280b;--accent: #e4572e;--accent-ink: #ffffff;--field: #0c180c;--panel: #f4f7df;--line: #26401f;--radius: 12px;--touch: 48px;--maxw: 1060px;--focus: #ffffff}*{box-sizing:border-box}html,body{margin:0;padding:0}body{background:radial-gradient(1200px 600px at 50% -10%,#1a4a1a 0%,var(--gb-dark) 55%,#081a08 100%);color:#101c0e;font-family:Courier New,ui-monospace,SFMono-Regular,Menlo,monospace;-webkit-tap-highlight-color:transparent;overscroll-behavior:none}.skip-link{position:absolute;left:-9999px;top:0;background:#fff;color:#000;padding:8px 12px;z-index:50;border-radius:0 0 8px}.skip-link:focus{left:0}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}.shell{max-width:var(--maxw);margin:0 auto;padding:12px 12px calc(16px + env(safe-area-inset-bottom))}.topbar{display:flex;align-items:center;justify-content:space-between;gap:12px;background:var(--gb-paper);border:3px solid var(--line);border-radius:var(--radius);padding:8px 12px;box-shadow:0 4px #00000059}.brand{display:flex;align-items:baseline;gap:10px}.brand-mark{display:inline-grid;place-items:center;width:34px;height:34px;background:var(--gb-dark);color:var(--gb-paper);border-radius:8px;font-size:20px}.brand h1{font-size:28px;letter-spacing:4px;margin:0;color:var(--gb-ink)}.tagline{font-size:12px;text-transform:uppercase;letter-spacing:2px;color:#3c5a2e}.top-actions{display:flex;gap:8px}.chip{min-width:var(--touch);min-height:var(--touch);font-size:20px;background:var(--gb-dark);color:var(--gb-paper);border:2px solid var(--line);border-radius:10px;cursor:pointer}.chip[aria-pressed=true]{outline:3px solid var(--accent);outline-offset:1px}.hud{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin:10px 0}.hud-card{background:var(--panel);border:3px solid var(--line);border-radius:10px;padding:6px 8px;text-align:center}.hud-label{display:block;font-size:11px;letter-spacing:2px;text-transform:uppercase;color:#435c33}.hud-card strong{font-size:22px;color:var(--gb-ink)}.hud-card.best strong{color:var(--accent)}.toast{min-height:28px;text-align:center;font-weight:700;letter-spacing:2px;color:var(--gb-paper);text-shadow:2px 2px 0 #000;margin:2px 0 8px}.toast.show{animation:pop .9s steps(6) 1}@keyframes pop{0%{transform:scale(.8)}40%{transform:scale(1.15)}to{transform:scale(1)}}.layout{display:grid;grid-template-columns:1fr;gap:10px;align-items:start}.board-wrap{position:relative;background:var(--gb-paper);border:4px solid var(--line);border-radius:14px;padding:10px;box-shadow:0 6px #00000059}#board{display:block;width:100%;height:auto;aspect-ratio:1 / 2;background:var(--field);border:3px solid var(--gb-ink);border-radius:8px;image-rendering:pixelated;touch-action:none}.side{display:grid;gap:10px}.panel{background:var(--panel);border:3px solid var(--line);border-radius:10px;padding:8px}.panel h2{margin:0 0 6px;font-size:14px;letter-spacing:2px}.panel h2 kbd{background:var(--gb-dark);color:var(--gb-paper);border-radius:4px;padding:0 6px;font-size:12px}.panel canvas{width:100%;height:auto;background:var(--field);border:2px solid var(--gb-ink);border-radius:6px;image-rendering:pixelated}.hint{font-size:12px;margin:6px 0 0;color:#334d29}.help ul{margin:0;padding-left:18px;font-size:13px}.credits{margin-top:8px;font-size:12px;color:#334d29}.credits summary{cursor:pointer;font-weight:700;letter-spacing:1px;border-radius:4px}.credits p{margin:6px 0 0}.overlay{position:absolute;inset:10px;display:grid;place-items:center;background:#0b280bb8;border-radius:8px}.overlay[hidden]{display:none}.overlay-card{background:var(--gb-paper);border:3px solid var(--line);border-radius:12px;padding:18px;text-align:center;max-width:320px;width:calc(100% - 32px)}.overlay-card h2{margin:0 0 4px;letter-spacing:4px}.overlay-card p{margin:6px 0;font-size:14px}.overlay-score{font-size:18px;font-weight:700}button.start{min-height:var(--touch);padding:10px 22px;font-size:18px;font-weight:700;letter-spacing:2px;color:var(--accent-ink);background:var(--accent);border:3px solid #7a2b12;border-radius:10px;cursor:pointer;box-shadow:0 4px #7a2b12}button.start:active{transform:translateY(2px);box-shadow:0 2px #7a2b12}.keys{font-size:12px;color:#334d29}.pad.gb{display:grid;gap:10px;margin-top:12px}.gb-row{display:flex;justify-content:space-between;align-items:center;gap:8px}.gb-row.sys{justify-content:center;gap:26px}.dpad{display:grid;grid-template-columns:repeat(3,50px);grid-template-rows:repeat(3,50px);filter:drop-shadow(0 4px 0 rgba(0,0,0,.4))}.dbtn{background:var(--gb-ink);color:var(--gb-paper);font-size:18px;border:none;cursor:pointer;touch-action:none;user-select:none;min-width:50px;min-height:50px}.dbtn:active{background:#000}.dbtn.up{grid-column:2;grid-row:1;border-radius:8px 8px 0 0}.dbtn.left{grid-column:1;grid-row:2;border-radius:8px 0 0 8px}.dbtn.right{grid-column:3;grid-row:2;border-radius:0 8px 8px 0}.dbtn.down{grid-column:2;grid-row:3;border-radius:0 0 8px 8px}.dpad-center{grid-column:2;grid-row:2;background:var(--gb-ink);background-image:radial-gradient(circle,rgba(155,188,15,.35) 0 22%,transparent 24%)}.ab{display:flex;align-items:flex-start;gap:14px}.abtn{width:64px;height:64px;border-radius:50%;background:var(--accent);color:#fff;font-size:22px;font-weight:700;border:3px solid #7a2b12;cursor:pointer;box-shadow:0 4px #7a2b12;touch-action:none;user-select:none}.abtn:active{transform:translateY(2px);box-shadow:0 2px #7a2b12}.abtn.a{margin-top:-10px}.sysbtn{min-width:84px;min-height:30px;padding:4px 14px;font-size:12px;font-weight:700;letter-spacing:2px;color:var(--gb-paper);background:var(--gb-ink);border:none;border-radius:999px;cursor:pointer;transform:rotate(-18deg);touch-action:manipulation;user-select:none;box-shadow:0 3px #0006}.sysbtn:active{transform:rotate(-18deg) translateY(2px);box-shadow:none}.pad-hint{margin:0;text-align:center;font-size:12px;color:#cfe0a8}.foot{margin-top:10px;text-align:center;color:#cfe0a8;font-size:12px}.foot code{background:#ffffff26;padding:0 6px;border-radius:4px}:focus-visible{outline:3px solid var(--focus);outline-offset:2px}@media(max-width:859px){.layout{display:flex;flex-direction:column;gap:8px}.board-wrap{order:-1;width:100%;max-width:420px;margin:0 auto}#board{width:auto;max-width:100%;margin-inline:auto;max-height:52vh;max-height:52dvh}.side.left{display:grid;grid-template-columns:1fr 1fr;gap:8px;width:100%;max-width:420px;margin:0 auto}.side.left .panel{padding:6px}.side.left .panel canvas{max-height:64px;object-fit:contain}#hold-hint,.side.right,.foot{display:none}.pad.gb{position:sticky;bottom:0;z-index:20;margin:8px -12px calc(-16px - env(safe-area-inset-bottom));padding:10px 14px calc(12px + env(safe-area-inset-bottom));background:linear-gradient(180deg,rgba(11,40,11,0) 0%,var(--gb-dark) 28%);border-top:3px solid var(--line)}.gb-row{max-width:420px;margin:0 auto;width:100%}.gb-row.sys{gap:18px}.dpad{grid-template-columns:repeat(3,56px);grid-template-rows:repeat(3,56px)}.dbtn{min-width:56px;min-height:56px;font-size:20px}.abtn{width:70px;height:70px}.sysbtn{min-height:34px}.pad-hint{color:#cfe0a8}}@media(max-width:359px){.dpad{grid-template-columns:repeat(3,50px);grid-template-rows:repeat(3,50px)}.dbtn{min-width:50px;min-height:50px}.abtn{width:62px;height:62px}}@media(min-width:860px){.layout{grid-template-columns:200px minmax(0,420px) 200px;justify-content:center}.board-wrap{max-width:440px;margin:0 auto;width:100%}.pad.gb{max-width:440px;margin:12px auto 0}}@media(prefers-reduced-motion:reduce){.toast.show{animation:none}*{scroll-behavior:auto!important}}