.loop-board{position:relative;width:100%;max-width:400px;aspect-ratio:1;margin:auto}#board{width:100%;height:100%;padding:0;display:grid;grid-template-columns:repeat(5,minmax(44px,1fr));grid-template-rows:repeat(5,minmax(44px,1fr));gap:0;max-width:none}.loop-cell{min-width:44px;min-height:44px;width:100%;height:100%;border:0;border-radius:0;background:transparent;padding:0;font-size:1.5rem;touch-action:manipulation}.loop-cell.selected{background:var(--selected);box-shadow:inset 0 0 0 2px #2563eb}.loop-cell.error{text-decoration:underline wavy var(--error)}#lines{position:absolute;inset:0;width:100%;height:100%;pointer-events:none;overflow:visible}.dot{fill:var(--text)}.dot.error{fill:var(--error)}.drawn-line{stroke:var(--text);stroke-width:1.2;stroke-linecap:round}.excluded-edge{stroke:var(--muted);stroke-width:.6;fill:none}.mark-controls{display:grid;grid-template-columns:repeat(4,minmax(44px,1fr));gap:6px;margin-top:8px}.mark-controls button{min-height:44px;padding:4px;font-size:.9rem}.mark-controls button[data-state="1"]{font-weight:800}.mark-controls button[data-state="0"]{color:var(--muted)}.play-actions{grid-template-columns:repeat(3,1fr);margin-top:8px}


.loop-board{width:min(100%,max(220px,calc(100svh - 290px)))}.center-dot,.arrow-clue,.black-mark,.white-mark{position:relative;z-index:2;display:inline-block;vertical-align:middle}.center-dot{width:4px;height:4px;border-radius:50%;background:var(--text)}.arrow-clue{background:var(--line);color:var(--text);font-size:1.05rem;font-weight:800;padding:3px;min-width:36px}.given-arrow{background:color-mix(in srgb,var(--line) 30%,var(--surface))}.black-cell{background:#111827;color:#fff}.black-cell.selected{background:#111827;box-shadow:inset 0 0 0 3px #60a5fa}.black-mark{color:#fff;font-size:1.05rem}.white-mark{font-size:1rem}.loop-cell.error{outline:2px solid var(--error);outline-offset:-3px}#lines{z-index:1}.cell-marks{display:grid;grid-template-columns:repeat(3,1fr);gap:6px;margin-top:6px}.cell-marks button{min-height:44px;padding:4px}.play-actions button{min-height:44px}