:root{--bg: #0f1b14;--board: #1f6b43;--board-line: #0f3a25;--hint: rgba(245, 245, 245, .35);--hint-black: rgba(40, 40, 40, .85);--last: #f2c14e;--black: #14181c;--white: #f5f5f5;--panel: #16261d;--panel-active: #21805020;--accent: #2fae6e;--text: #e8efe9;--text-dim: #8aa395}*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}html,body{margin:0;height:100%}body{background:var(--bg);color:var(--text);font-family:system-ui,-apple-system,Hiragino Kaku Gothic ProN,Noto Sans JP,sans-serif;overscroll-behavior:none;user-select:none;-webkit-user-select:none}#app{height:100dvh}.app{display:grid;grid-template-rows:1fr auto 1fr;align-items:center;justify-items:center;gap:clamp(8px,2vh,24px);height:100%;padding:env(safe-area-inset-top) 12px env(safe-area-inset-bottom)}.panel{width:min(92vw,560px);display:flex;align-items:center;justify-content:space-between;gap:12px;padding:12px 16px;border-radius:14px;background:var(--panel);border:2px solid transparent;transition:border-color .2s,background .2s}.panel-top{transform:rotate(180deg)}.panel.active{border-color:var(--accent);background:var(--panel-active)}.panel-info{display:flex;align-items:center;gap:10px}.panel-disc{width:22px;height:22px;border-radius:50%;flex:none}.panel-disc.black{background:var(--black);border:1px solid #2a2f35}.panel-disc.white{background:var(--white)}.panel-label{font-size:1rem;color:var(--text-dim)}.panel-count{font-size:1.6rem;font-weight:700;font-variant-numeric:tabular-nums;min-width:2ch;text-align:right}.panel-status{font-size:.95rem;font-weight:600;color:var(--accent);min-height:1.2em}.btn{-webkit-appearance:none;-moz-appearance:none;appearance:none;border:1px solid #2c3f33;background:#1b2c22;color:var(--text);font-size:.9rem;padding:8px 14px;border-radius:10px;cursor:pointer}.btn:active{background:#24362a}.btn:disabled{opacity:.35;cursor:default}.btn-primary{background:var(--accent);border-color:var(--accent);color:#08130c;font-weight:700;font-size:1.05rem;padding:12px 28px}.board{--gap: 2px;display:grid;grid-template-columns:repeat(var(--size),1fr);gap:var(--gap);width:min(92vw,70vh,560px);aspect-ratio:1 / 1;padding:var(--gap);background:var(--board-line);border-radius:10px}.cell{-webkit-appearance:none;-moz-appearance:none;appearance:none;border:none;margin:0;padding:0;background:var(--board);position:relative;cursor:default;display:grid;place-items:center}.cell.hint{cursor:pointer}.cell.hint:after{content:"";position:absolute;width:26%;height:26%;border-radius:50%;background:var(--hint)}.board.turn-black .cell.hint:after{background:var(--hint-black)}.cell.last:before{content:"";position:absolute;top:8%;right:8%;bottom:8%;left:8%;border:2px solid var(--last);border-radius:4px;pointer-events:none;z-index:2}.disc{position:relative;width:80%;height:80%;transform-style:preserve-3d;transition:transform .4s ease,opacity .2s ease}.disc.empty{opacity:0;transform:scale(.2);pointer-events:none}.disc.black{transform:rotateY(0)}.disc.white{transform:rotateY(180deg)}.disc.flip{animation:place-pop .25s ease}.face{position:absolute;top:0;right:0;bottom:0;left:0;border-radius:50%;backface-visibility:hidden;-webkit-backface-visibility:hidden;box-shadow:inset 0 -3px 6px #00000059}.face.black{background:radial-gradient(circle at 35% 30%,#3a4149,var(--black));transform:rotateY(0)}.face.white{background:radial-gradient(circle at 35% 30%,#fff,#d9d9d9);transform:rotateY(180deg)}@keyframes place-pop{0%{box-shadow:0 0 #2fae6e00}50%{box-shadow:0 0 0 6px #2fae6e40}to{box-shadow:0 0 #2fae6e00}}.overlay{position:fixed;top:0;right:0;bottom:0;left:0;display:grid;place-items:center;background:#080e0ab8;-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px);z-index:10}.overlay.hidden{display:none}.overlay-card{background:var(--panel);border:1px solid #2c3f33;border-radius:18px;padding:28px 36px;text-align:center;display:grid;gap:18px}.overlay-text{margin:0;font-size:1.5rem;font-weight:700;white-space:pre-line;line-height:1.5}.toast{position:fixed;left:50%;top:50%;transform:translate(-50%,-50%);background:#080e0ae6;border:1px solid var(--accent);color:var(--text);padding:12px 20px;border-radius:12px;font-size:1rem;z-index:9;pointer-events:none}.toast.hidden{display:none}.menu{position:fixed;right:calc(env(safe-area-inset-right) + 16px);bottom:calc(env(safe-area-inset-bottom) + 16px);display:flex;flex-direction:column;align-items:flex-end;gap:12px;z-index:8}.fab{-webkit-appearance:none;-moz-appearance:none;appearance:none;width:56px;height:56px;border-radius:50%;border:none;background:var(--accent);color:#08130c;display:grid;place-items:center;cursor:pointer;box-shadow:0 6px 16px #0006}.fab:active{transform:scale(.94)}.fab-bars,.fab-bars:before,.fab-bars:after{content:"";display:block;width:22px;height:2.5px;border-radius:2px;background:currentColor;transition:transform .25s ease,opacity .2s ease}.fab-bars{position:relative}.fab-bars:before{position:absolute;top:-7px;left:0}.fab-bars:after{position:absolute;top:7px;left:0}.menu.open .fab-bars{background:transparent}.menu.open .fab-bars:before{transform:translateY(7px) rotate(45deg)}.menu.open .fab-bars:after{transform:translateY(-7px) rotate(-45deg)}.menu-sheet{display:flex;flex-direction:column;align-items:stretch;gap:8px;padding:8px;border-radius:14px;background:var(--panel);border:1px solid #2c3f33;box-shadow:0 8px 22px #00000073;transform-origin:bottom right;transition:opacity .2s ease,transform .2s ease}.menu:not(.open) .menu-sheet{opacity:0;transform:scale(.9) translateY(8px);pointer-events:none}.menu-item{-webkit-appearance:none;-moz-appearance:none;appearance:none;border:none;background:transparent;color:var(--text);font-size:1rem;font-weight:600;text-align:center;padding:12px 28px;border-radius:10px;cursor:pointer;white-space:nowrap}.menu-item:active{background:#24362a}.menu-item:disabled{opacity:.35;cursor:default}.menu-item.off{color:var(--text-muted, #8b9a8f)}@media(prefers-reduced-motion:reduce){.fab-bars,.fab-bars:before,.fab-bars:after,.menu-sheet{transition:none}}.start-screen{position:fixed;top:0;right:0;bottom:0;left:0;display:grid;place-items:center;padding:env(safe-area-inset-top) 24px env(safe-area-inset-bottom);background:radial-gradient(circle at 50% 38%,#16301f 0%,var(--bg) 70%);cursor:pointer;z-index:30;opacity:1;transition:opacity .4s ease}.start-screen.start-leaving{opacity:0}.start-screen.hidden{display:none}.start-inner{display:grid;justify-items:center;gap:clamp(24px,6vh,56px);animation:start-rise .6s ease both}.title-logo{width:min(82vw,460px);height:auto;filter:drop-shadow(0 6px 18px rgba(0,0,0,.45))}.start-hint{margin:0;font-size:1.05rem;font-weight:600;color:var(--text-dim);letter-spacing:.04em;animation:start-blink 1.8s ease-in-out infinite}@keyframes start-rise{0%{opacity:0;transform:translateY(16px)}to{opacity:1;transform:translateY(0)}}@keyframes start-blink{0%,to{opacity:.45}50%{opacity:1}}@media(prefers-reduced-motion:reduce){.start-inner,.start-hint{animation:none}}.rotate-hint{display:none}@media(orientation:landscape)and (max-height:600px){.rotate-hint{position:fixed;top:0;right:0;bottom:0;left:0;display:grid;place-items:center;background:var(--bg);color:var(--text);font-size:1.2rem;z-index:20}.app{display:none}}@media(prefers-reduced-motion:reduce){.disc{transition:opacity .2s ease}.disc.flip{animation:none}}