:root{--light-on: #ffd23f;--light-on-hi: #fff09a;--light-off: #2c2a26;--light-off-hi: #3a3833}*{box-sizing:border-box;margin:0;padding:0}html,body{min-height:100%;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;-webkit-font-smoothing:antialiased;touch-action:manipulation}#app{min-height:100%;display:flex;align-items:center;justify-content:center;padding:16px}.game{width:min(94vw,420px);display:flex;flex-direction:column;gap:14px}.crumb{font-size:14px}.crumb a{color:var(--accent);text-decoration:none;font-weight:700}.crumb a:hover{text-decoration:underline}.topbar{display:flex;align-items:center;justify-content:space-between}.title{font-size:clamp(28px,8vw,44px);font-weight:800;line-height:1;letter-spacing:-1px}.stats{display:flex;gap:8px}.stat{flex:1;background:var(--board-bg);color:var(--accent-text);border-radius:6px;padding:6px 10px;text-align:center}.stat .label{font-size:10px;text-transform:uppercase;letter-spacing:1px;opacity:.85;font-weight:700}.stat .value{font-size:22px;font-weight:800;line-height:1.1}.sizes{display:flex;gap:8px}.size-btn{flex:1;min-height:44px;background:var(--surface);color:var(--text);border:2px solid var(--line);border-radius:6px;padding:10px;font-size:15px;font-weight:700;cursor:pointer;transition:border-color .12s ease,filter .12s ease}.size-btn:hover{filter:brightness(1.04)}.size-btn.active{border-color:var(--accent);color:var(--accent)}.status{font-size:16px;font-weight:700;text-align:center;min-height:22px}.board{position:relative;width:min(100%,66dvh);margin:0 auto}.grid{display:grid;gap:3%;background:var(--board-bg);padding:3%;border-radius:12px}.light{aspect-ratio:1 / 1;border:none;border-radius:16%;cursor:pointer;background:radial-gradient(circle at 34% 30%,var(--light-off-hi),var(--light-off));box-shadow:inset 0 2px 5px #0006;transition:background .12s ease,box-shadow .16s ease,transform 80ms ease}.light.on{background:radial-gradient(circle at 34% 30%,var(--light-on-hi),var(--light-on));box-shadow:0 0 12px 2px #ffd23f99,inset 0 1px 3px #ffffff80}.light:active{transform:scale(.94)}.light.cursor{outline:3px solid var(--accent);outline-offset:-1px}.light.flip{animation:light-pop .24s ease}@keyframes light-pop{0%{transform:scale(1)}40%{transform:scale(1.14)}to{transform:scale(1)}}.overlay{position:absolute;inset:0;border-radius:12px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:12px;text-align:center;padding:20px;background:var(--overlay-bg);z-index:10;opacity:0;pointer-events:none;transition:opacity .22s ease}.overlay.show{opacity:1;pointer-events:auto}.overlay .msg{font-size:clamp(28px,9vw,44px);font-weight:800;color:#ed9a2e}.overlay .sub{font-size:15px;font-weight:700;opacity:.9}.controls{display:flex;align-items:center;justify-content:space-between;gap:10px}.how{font-size:13px;opacity:.85;flex:1}.how b{font-weight:700}.btn{background:var(--accent);color:var(--accent-text);border:none;border-radius:6px;padding:10px 16px;font-size:14px;font-weight:700;cursor:pointer;white-space:nowrap;transition:filter .12s ease}.btn:hover{filter:brightness(1.05)}.btn:active{filter:brightness(.95)}