:root{--bg: #12100c;--panel: #221d15;--line: #3a3122;--ink: #f5efe2;--dim: #b6a888;--accent: #f0b545;--cell: #1a160f}*{box-sizing:border-box}html,body{margin:0;height:100%}body{background:radial-gradient(900px 560px at 50% -8%,#20190f,var(--bg));color:var(--ink);font-family:system-ui,-apple-system,Segoe UI,sans-serif;display:flex;justify-content:center;-webkit-user-select:none;user-select:none}#app{width:100%;max-width:540px;padding:12px 12px 26px}header{text-align:center;margin-bottom:6px}h1{margin:0;font-size:26px;letter-spacing:4px;font-weight:800;color:var(--accent)}.sub{margin:4px 0 0;color:var(--dim);font-size:13px}.bar{display:flex;gap:8px;justify-content:center;flex-wrap:wrap;align-items:center;margin:9px 0}.seg{display:inline-flex;background:var(--panel);border:1px solid var(--line);border-radius:999px;overflow:hidden}.seg button{background:none;border:none;color:var(--dim);padding:6px 13px;font:600 13px system-ui;cursor:pointer}.seg button.active{background:var(--accent);color:#1a1206}.btn{background:var(--panel);border:1px solid var(--line);color:var(--ink);padding:7px 14px;border-radius:999px;font:700 13px system-ui;cursor:pointer}.btn:hover{border-color:var(--accent)}.scoreboard{display:flex;gap:10px;justify-content:center;align-items:center;margin:8px 0;flex-wrap:wrap}.readout{background:#0d0b07;border:1px solid var(--line);border-radius:8px;padding:5px 14px;font:800 18px ui-monospace,monospace;color:var(--accent);min-width:84px;text-align:center}.readout span{color:var(--dim);font-size:11px;display:block;font-weight:600;letter-spacing:.5px}.stage{position:relative;display:flex;justify-content:center}.board{position:relative;display:grid;grid-template-columns:repeat(var(--cols),1fr);grid-template-rows:repeat(var(--rows),1fr);gap:6px;background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:8px;width:min(94vw,460px);aspect-ratio:var(--cols) / var(--rows)}.cell{background:var(--cell);border-radius:7px}.ghost{border-radius:8px;margin:1px;border:2px dashed color-mix(in srgb,var(--gc) 60%,transparent);background:color-mix(in srgb,var(--gc) 10%,transparent);pointer-events:none}.domino{position:relative;border-radius:9px;margin:1px;cursor:pointer;background:linear-gradient(150deg,color-mix(in srgb,var(--dc) 86%,#fff 0%),color-mix(in srgb,var(--dc) 62%,#000 20%));box-shadow:inset 0 0 0 1px #00000040,0 2px 5px #00000059;display:flex;align-items:center;justify-content:center;transition:transform .08s ease}.domino:hover{transform:scale(1.02)}.domino .pip{font:800 18px ui-monospace,monospace;color:#0009}.domino.selected{box-shadow:inset 0 0 0 3px var(--accent),0 0 0 2px #f0b54580,0 2px 5px #00000059}.domino.home:after{content:"✓";position:absolute;top:2px;right:5px;font-size:12px;color:#0000008c;font-weight:800}.pad{display:grid;grid-template-columns:repeat(3,46px);grid-template-rows:repeat(2,40px);gap:5px;justify-content:center;margin:12px auto 0}.padbtn{background:var(--panel);border:1px solid var(--line);color:var(--ink);border-radius:9px;font-size:15px;cursor:pointer}.padbtn:hover{border-color:var(--accent);color:var(--accent)}.padbtn.up{grid-column:2;grid-row:1}.padbtn.left{grid-column:1;grid-row:2}.padbtn.down{grid-column:2;grid-row:2}.padbtn.right{grid-column:3;grid-row:2}.overlay{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;background:#0a0805bd;border-radius:12px;backdrop-filter:blur(3px)}.overlay.hidden{display:none}.card{background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:22px 26px;text-align:center;max-width:320px}.card h2{margin:0 0 6px;font-size:24px;color:var(--accent)}.card p{margin:6px 0;color:var(--dim);font-size:14px}.card .row{display:flex;gap:8px;justify-content:center;margin-top:14px}.hint{text-align:center;color:var(--dim);font-size:12px;margin-top:12px;line-height:1.5}