:root{--bg: #1b1f2a;--panel: #252b3a;--inner: #3a4a63;--inner-2: #34435a;--perimeter: #2a3142;--legal: #4caf7d;--accent: #f0a500;--text: #e8ecf4;--muted: #9aa6bd;--black-stone: #1a1a1a;--white-stone: #f4f4f4;--cell-gap: 3px}*{box-sizing:border-box}html,body{margin:0;background:var(--bg);color:var(--text);font-family:system-ui,-apple-system,Segoe UI,Hiragino Sans,Noto Sans JP,sans-serif;-webkit-tap-highlight-color:transparent}.app{max-width:560px;margin:0 auto;padding:16px 14px 40px;display:flex;flex-direction:column;gap:14px}.header-row{display:flex;align-items:center;justify-content:space-between}.app-header h1{margin:0;font-size:1.7rem;letter-spacing:.12em}.mute-btn{border:1px solid #3a4256;background:var(--panel);border-radius:8px;font-size:1.1rem;width:40px;height:40px;cursor:pointer;transition:background .12s ease,transform .06s ease}.mute-btn:hover{background:#3a4665}.mute-btn:active{transform:scale(.92)}.subtitle{margin:2px 0 0;color:var(--muted);font-size:.85rem}.settings{display:flex;flex-direction:column;gap:8px}.seg{display:flex;gap:6px;background:var(--panel);padding:5px;border-radius:10px}.seg-btn{flex:1;border:none;background:transparent;color:var(--muted);padding:9px 8px;border-radius:7px;font-size:.9rem;cursor:pointer;transition:background .12s ease,color .12s ease}.seg-btn:hover{color:var(--text)}.seg-btn.on{background:var(--accent);color:#1b1f2a;font-weight:700}.seg-difficulty .seg-btn.on{background:var(--legal);color:#06180f}.online-panel{background:var(--panel);border-radius:12px;padding:22px 18px;display:flex;flex-direction:column;gap:14px;align-items:stretch;text-align:center}.online-lead{margin:0;font-size:1.05rem;font-weight:600}.online-note{margin:0;color:var(--muted);font-size:.82rem;line-height:1.6}.online-error{color:#ff8a80;font-size:.85rem;margin:0}.join-row{display:flex;gap:8px}.code-input{flex:1;background:#11141d;border:1px solid #3a4256;color:var(--text);border-radius:8px;padding:10px 12px;font-size:1.1rem;letter-spacing:.25em;text-align:center;text-transform:uppercase}.code-display{display:flex;align-items:center;justify-content:center;gap:12px}.code-big{font-size:2rem;font-weight:800;letter-spacing:.3em;color:var(--accent);font-family:ui-monospace,monospace}.online-game{display:flex;flex-direction:column;gap:12px}.online-bar{display:flex;align-items:center;gap:8px}.room-chip,.you-chip{font-size:.82rem;padding:5px 10px;border-radius:999px;background:var(--panel)}.room-chip{font-family:ui-monospace,monospace;letter-spacing:.15em}.you-chip{display:inline-flex;align-items:center;gap:6px}.you-black{border:1px solid #555}.you-white{border:1px solid #bbb}.online-bar .btn-sm{margin-left:auto}.btn-sm{padding:6px 12px;font-size:.85rem}.turn-mine{background:#1f4d3a}.status-bar{min-height:28px}.turn{display:flex;align-items:center;gap:8px;padding:10px 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1;width:100%}.topple-overlay{position:absolute;top:0;right:0;bottom:0;left:0;display:grid;grid-template-columns:repeat(8,1fr);grid-template-rows:repeat(8,1fr);gap:var(--cell-gap);padding:var(--cell-gap);pointer-events:none;z-index:20}.topple-target{aspect-ratio:1 / 1}.topple-target{pointer-events:auto;border:2px dashed rgba(240,165,0,.7);background:#f0a5001a;border-radius:6px;padding:0;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:background .1s ease,box-shadow .1s ease}.topple-target:hover{background:#f0a50040;box-shadow:0 0 14px #f0a50099}.topple-target.off-board{border-color:#dc5050cc;background:#dc50501f}.topple-target.hover-top{background:#f0a5004d;box-shadow:0 0 16px #f0a500b3}.topple-target.hover-mid{background:#7896dc40;border-style:solid}.topple-arrow{font-size:1.3rem;color:var(--accent);font-weight:700}.preview-disc{width:64%;aspect-ratio:1 / 1;border-radius:50%;box-shadow:0 2px 4px #00000080;display:flex;align-items:center;justify-content:center;opacity:.92}.preview-disc.vanish{opacity:.5;filter:grayscale(.4)}.vanish-x{color:#e53935;font-weight:900;font-size:1.2rem}.cell{position:relative;border:none;border-radius:6px;padding:0;cursor:default;aspect-ratio:1 / 1;transition:transform .08s ease,box-shadow .15s ease}.cell-inner{background:var(--inner)}.cell-perimeter{background:var(--perimeter);background-image:repeating-linear-gradient(45deg,transparent,transparent 5px,rgba(255,255,255,.03) 5px,rgba(255,255,255,.03) 10px)}.cell-legal{cursor:pointer;background:var(--inner-2);box-shadow:inset 0 0 0 2px var(--legal)}.cell-legal:hover{transform:scale(1.05);box-shadow:inset 0 0 0 2px var(--legal),0 0 12px #4caf7d80}.cell-toppling{box-shadow:inset 0 0 0 3px var(--accent),0 0 16px #f0a50099;animation:pulse .8s ease-in-out infinite}.cell-selectable{cursor:pointer}.cell-selectable:hover{transform:scale(1.06)}.cell-selected-tower{box-shadow:inset 0 0 0 3px #ffd591,0 0 22px #ffd591e6;animation:none}@keyframes pulse{0%,to{box-shadow:inset 0 0 0 3px var(--accent),0 0 8px #f0a50066}50%{box-shadow:inset 0 0 0 3px var(--accent),0 0 20px #f0a500cc}}.legal-dot{position:absolute;top:0;right:0;bottom:0;left:0;margin:auto;width:22%;height:22%;border-radius:50%;background:var(--legal);opacity:.55}.stack{position:absolute;top:0;right:0;bottom:0;left:0}.disc{position:absolute;left:50%;transform:translate(-50%);width:64%;aspect-ratio:1 / 1;border-radius:50%;box-shadow:0 2px 4px #00000080;animation:drop-in .18s ease-out}@keyframes drop-in{0%{transform:translate(-50%) scale(.4);opacity:0}to{transform:translate(-50%) scale(1);opacity:1}}.disc-black{background:radial-gradient(circle at 35% 30%,#444,var(--black-stone));border:1px solid #000}.disc-white{background:radial-gradient(circle at 35% 30%,#fff,#d2d2d2);border:1px solid #999}.height-badge{position:absolute;top:1px;right:1px;z-index:10;font-size:.6rem;font-weight:700;background:var(--accent);color:#1b1f2a;border-radius:50%;width:15px;height:15px;display:flex;align-items:center;justify-content:center}.axis-panel{background:var(--panel);border-radius:10px;padding:12px 14px;text-align:center}.axis-panel p{margin:0 0 10px;font-size:.9rem}.queue-note{color:var(--accent);font-size:.8rem}.axis-buttons{display:flex;gap:10px;justify-content:center}.btn{border:1px solid #3a4256;background:#2f3850;color:var(--text);padding:10px 16px;border-radius:8px;font-size:.95rem;cursor:pointer;transition:background .12s ease,transform .06s ease}.btn:hover{background:#3a4665}.btn:active{transform:scale(.97)}.btn-axis{flex:1;font-size:1.05rem;padding:14px}.btn-primary{background:var(--legal);border-color:var(--legal);color:#06180f;font-weight:700}.btn-ghost{background:transparent}.overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#0a0c12b3;display:flex;align-items:center;justify-content:center;z-index:100;animation:drop-in .25s ease-out}.overlay-card{background:var(--panel);padding:28px 32px;border-radius:16px;display:flex;flex-direction:column;gap:10px;text-align:center;min-width:240px}.overlay-card h2{margin:0 0 8px}.app-footer{display:flex;flex-direction:column;gap:8px;align-items:center}.hint{color:var(--muted);font-size:.78rem;line-height:1.5;margin:0;text-align:center}.cell-last-move{box-shadow:inset 0 0 0 2px #6fa8ff,0 0 10px #6fa8ff99}.reach-badge{position:absolute;top:2px;left:2px;width:9px;height:9px;border-radius:50%;z-index:9;animation:reach-blink 1s ease-in-out infinite}.cell-reach-black 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.chat-body{font-size:1.4rem}.chat-stamps,.chat-emotes{display:flex;gap:5px;flex-wrap:wrap}.stamp-btn{border:1px solid #3a4256;background:#2f3850;border-radius:8px;font-size:1.1rem;width:34px;height:34px;cursor:pointer}.stamp-btn:hover{background:#3a4665}.emote-btn{border:1px solid #3a4256;background:#2f3850;color:var(--text);border-radius:999px;padding:5px 10px;font-size:.78rem;cursor:pointer}.emote-btn:hover{background:#3a4665}.chat-input-row{display:flex;gap:6px}.chat-input{flex:1;background:#11141d;border:1px solid #3a4256;color:var(--text);border-radius:8px;padding:8px 10px;font-size:.9rem}.evalgraph{background:var(--panel);border-radius:10px;padding:8px 10px}.evalgraph-svg{width:100%;height:90px;display:block;cursor:pointer}.eval-black-zone{fill:#78a0e614}.eval-white-zone{fill:#f0c88214}.eval-midline{stroke:#5a6680;stroke-width:1;stroke-dasharray:4 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ease}.bug-modal-close:hover{background:#3a4665;color:var(--text)}.bug-form{display:flex;flex-direction:column;gap:12px}.bug-label{display:flex;flex-direction:column;gap:6px;font-size:.88rem;color:var(--muted)}.bug-required{color:#ff8a80}.bug-textarea{background:#11141d;border:1px solid #3a4256;color:var(--text);border-radius:8px;padding:9px 11px;font-size:.9rem;font-family:inherit;resize:vertical;min-height:72px}.bug-textarea:focus{outline:none;border-color:var(--accent)}.bug-select{background:#11141d;border:1px solid #3a4256;color:var(--text);border-radius:8px;padding:9px 11px;font-size:.9rem;cursor:pointer}.bug-select:focus{outline:none;border-color:var(--accent)}.bug-attach-note{margin:0;font-size:.8rem;color:var(--muted)}.bug-error{margin:0;font-size:.85rem;color:#ff8a80}.bug-actions{display:flex;gap:8px;justify-content:flex-end}.bug-success{display:flex;flex-direction:column;gap:8px;align-items:center;text-align:center;padding:8px 0}.bug-success p{margin:0}.bug-success a{color:var(--accent);text-decoration:none}.bug-success a:hover{text-decoration:underline}.bug-success-note{color:var(--muted);font-size:.85rem}