*{margin:0;padding:0;box-sizing:border-box}
:root{--bg:#0a0b0f;--bg2:#11131a;--card:#161922;--card2:#1a1e28;--border:#232733;--border2:#2d3340;--text:#e8eaf0;--dim:#7a8190;--accent:#2ecc71;--hover:#58d68d;--green:#2ecc71;--red:#ff3b3b;--gold:#fdcb6e;--r:16px}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;background:var(--bg);color:var(--text);min-height:100vh;line-height:1.7;overflow-x:hidden}
.navbar{display:flex;justify-content:space-between;align-items:center;padding:.75rem 2rem;border-bottom:1px solid var(--border);position:sticky;top:0;background:rgba(10,11,15,.92);backdrop-filter:blur(12px);z-index:50}
.navbar .brand{font-weight:800;color:var(--text);text-decoration:none;font-size:1.05rem;display:flex;align-items:center;gap:.4rem}
.navbar .nav-links{display:flex;gap:1rem}
.navbar .nav-links a{color:var(--dim);text-decoration:none;font-size:.82rem;transition:color .2s;min-height:44px;display:inline-flex;align-items:center}
.navbar .nav-links a:hover,.navbar .nav-links a.active{color:var(--hover)}
main{max-width:640px;margin:0 auto;padding:2.5rem 1.5rem 3rem}
h1{font-size:2.2rem;margin-bottom:.4rem;text-align:center;background:linear-gradient(135deg,#2ecc71,#58d68d,#27ae60);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.subtitle{color:var(--dim);font-size:1rem;margin-bottom:1.5rem;text-align:center}
h2{font-size:1.15rem;margin:1.5rem 0 .6rem;color:var(--hover)}
p{margin-bottom:.75rem}a{color:var(--hover)}
ul{margin:0 0 1rem 1.25rem}li{margin-bottom:.4rem}

.diff-btns{display:flex;gap:.5rem;flex-wrap:wrap;justify-content:center;margin-bottom:1rem}
.diff-btn{background:var(--bg2);border:1px solid var(--border2);border-radius:999px;padding:.5rem 1.3rem;font-size:.85rem;color:var(--dim);cursor:pointer;transition:all .15s;font-family:inherit;min-height:44px;display:inline-flex;align-items:center}
.diff-btn:hover{border-color:var(--accent);color:var(--text)}
.diff-btn.active{background:linear-gradient(135deg,var(--accent),#27ae60);border-color:var(--accent);color:#fff;box-shadow:0 4px 14px rgba(46,204,113,.3)}

.game-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:1rem;background:var(--card);border:1px solid var(--border2);border-radius:var(--r);padding:1rem 1.5rem}
.score-box{text-align:center}
.score-box .label{font-size:.65rem;color:var(--dim);text-transform:uppercase;letter-spacing:.05em}
.score-box .value{font-size:1.6rem;font-weight:800;color:var(--accent);font-variant-numeric:tabular-nums;font-family:"Courier New",monospace}
.score-box.best .value{color:var(--gold)}

.canvas-wrap{display:flex;justify-content:center;margin-bottom:1rem}
canvas{background:var(--bg2);border:1px solid var(--border2);border-radius:12px;touch-action:none;max-width:100%}

.overlay{position:absolute;top:0;left:0;width:100%;height:100%;display:flex;flex-direction:column;align-items:center;justify-content:center;background:rgba(10,11,15,.85);border-radius:12px;text-align:center;padding:2rem}
.overlay.hidden{display:none}
.overlay .title{font-size:1.8rem;font-weight:800;margin-bottom:.5rem}
.overlay .title.win{color:var(--accent)}
.overlay .title.lose{color:var(--red)}
.overlay .detail{color:var(--dim);font-size:.9rem;margin-bottom:1rem}

.btn{background:linear-gradient(135deg,var(--accent),#27ae60);color:#fff;border:none;border-radius:10px;padding:.75rem 1.8rem;font-size:.9rem;font-weight:600;cursor:pointer;transition:transform .1s,box-shadow .15s;font-family:inherit;min-height:44px;box-shadow:0 4px 14px rgba(46,204,113,.3)}
.btn:hover{box-shadow:0 6px 20px rgba(46,204,113,.45)}
.btn:active{transform:scale(.97)}
.btn-secondary{background:var(--bg2);border:1px solid var(--border2);box-shadow:none;color:var(--dim)}
.btn-secondary:hover{background:var(--card);color:var(--text);box-shadow:none}

.mobile-controls{display:none;grid-template-columns:repeat(3,1fr);gap:.4rem;max-width:200px;margin:0 auto 1rem}
.mobile-controls button{background:var(--card);border:1px solid var(--border2);border-radius:10px;padding:1rem;font-size:1.2rem;color:var(--text);cursor:pointer;font-family:inherit;min-height:44px}
.mobile-controls button:active{background:var(--accent);color:#fff}
.mc-spacer{visibility:hidden}

.hint{text-align:center;color:var(--dim);font-size:.8rem;margin-bottom:1rem}
.hint kbd{background:var(--bg2);border:1px solid var(--border2);border-radius:4px;padding:.1rem .4rem;font-family:monospace;font-size:.75rem;color:var(--text)}

.stats-footer{text-align:center;margin:1.5rem 0;font-size:.78rem;color:var(--dim)}
.stats-footer strong{color:var(--hover);font-variant-numeric:tabular-nums}
.stat-divider{margin:0 .6rem;opacity:.4}
footer{text-align:center;padding:1.5rem 2rem;color:var(--dim);font-size:.75rem;border-top:1px solid var(--border)}
footer a{color:var(--hover);text-decoration:none}
.seo-section{color:var(--dim);font-size:.88rem;margin-top:2.5rem;line-height:1.8}
.seo-section h2{color:var(--text)}

@keyframes fade{0%{opacity:0}100%{opacity:1}}

@media(max-width:600px){
  main{padding:2rem 1rem 3rem}
  h1{font-size:1.6rem}
  .navbar{padding:.75rem 1rem}
  .navbar .nav-links{gap:.6rem}
  .mobile-controls{display:grid}
  .game-header{padding:.75rem 1rem}
}