:root { --bg:#0b1220; --panel:#111a2e; --cell:#1a2744; --cell-open:#0f1a33; --text:#e6ecff; --muted:#8fa0c9; --accent:#5aa9ff; --danger:#ff5a6b; --flag:#ffd166; }
* { box-sizing:border-box; }
html,body { margin:0; padding:0; background:var(--bg); color:var(--text); font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif; }
#app { max-width:980px; margin:0 auto; padding:12px; }
.topbar { display:flex; align-items:center; gap:12px; margin-bottom:8px; }
.title { font-weight:700; } .title small { color:var(--muted); font-weight:400; font-size:12px; }
.spacer { flex:1; } .hud { display:flex; gap:8px; font-size:14px; } .hud b { color:var(--accent); }
.sep { color:var(--muted); }
#status { min-height:20px; color:var(--muted); margin:6px 0; font-size:14px; }
.controls { display:flex; gap:8px; flex-wrap:wrap; margin:8px 0; }
.btn { background:var(--cell); color:var(--text); border:1px solid #2a3a60; border-radius:8px; padding:6px 12px; cursor:pointer; font-size:13px; }
.btn.primary { background:var(--accent); color:#0b1220; border-color:var(--accent); font-weight:700; }
.btn.active { outline:2px solid var(--accent); }
#board { display:grid; gap:2px; margin:10px auto; user-select:none; touch-action:none; }
.cell { width:30px; height:30px; background:var(--cell); border:1px solid #2a3a60; border-radius:4px; display:flex; align-items:center; justify-content:center; font-weight:700; font-size:14px; cursor:pointer; color:var(--text); }
.cell.open { background:var(--cell-open); cursor:default; }
.cell.mine { background:var(--danger); }
.cell.flag { color:var(--flag); }
.cell.n1{color:#5aa9ff} .cell.n2{color:#66d9a3} .cell.n3{color:#ff8a8a} .cell.n4{color:#b388ff} .cell.n5{color:#ff9f43} .cell.n6{color:#4dd0e1} .cell.n7{color:#ff6b9d} .cell.n8{color:#cfd8dc}
.legend { color:var(--muted); font-size:12px; margin-top:8px; }
#toast { position:fixed; bottom:12px; left:50%; transform:translateX(-50%); background:#111a2e; padding:8px 14px; border-radius:8px; border:1px solid #2a3a60; display:none; }
@media (max-width:600px){ .cell{width:24px;height:24px;font-size:12px;} }