:root{--bg:#70c5ce;--ground:#ded895;--pipe:#2ecc71;--bird:#ffd633}
*{box-sizing:border-box}
html,body{height:100%;margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,"Helvetica Neue",Arial}
body{display:flex;align-items:center;justify-content:center;background:linear-gradient(#9ee6f0,var(--bg));}
.wrap{width:420px;text-align:center}
h1{margin:12px 0 6px;font-size:20px;color:#064;letter-spacing:1px}
canvas{display:block;margin:0 auto;border-radius:8px;background:linear-gradient(#87e0ff,#bfefff);box-shadow:0 6px 18px rgba(0,0,0,0.15)}
.hud{display:flex;justify-content:space-between;align-items:center;margin-top:8px}
#score{font-weight:700;font-size:20px;color:#024}
#msg{font-size:13px;color:#045}
footer{font-size:12px;color:#034;margin-top:6px}

/* responsive */
@media (max-width:480px){.wrap{width:92vw}canvas{width:100%;height:auto}}

/* Admin/login UI */
.admin-btn{position:fixed;right:16px;bottom:16px;background:transparent;border:0;color:#033;font-weight:700;cursor:pointer;font-size:14px}
.overlay{position:fixed;inset:0;background:rgba(0,0,0,0.45);display:flex;align-items:center;justify-content:center;z-index:40}
.modal{background:#fff;padding:18px;border-radius:8px;min-width:280px;box-shadow:0 8px 30px rgba(0,0,0,0.25)}
.modal h3{margin:0 0 8px;font-size:16px}
.modal label{display:block;margin:8px 0 4px;font-size:13px}
.modal input{width:100%;padding:8px;border-radius:6px;border:1px solid #ddd}
.modal .actions{display:flex;justify-content:flex-end;gap:8px;margin-top:12px}
.link-like{background:none;border:none;color:#0a66c2;cursor:pointer;padding:0;font-weight:700}
.small-muted{font-size:12px;color:#666;margin-top:6px}
/* Difficulty buttons */
.diff-controls{display:flex;gap:8px;align-items:center}
.diff-btn{padding:6px 10px;border-radius:6px;border:1px solid #ddd;background:#fff;cursor:pointer}
.diff-btn.active{background:#0a66c2;color:#fff;border-color:#095aa8}
/* bottom score badge */
.bottom-score{position:fixed;left:16px;bottom:16px;background:rgba(255,255,255,0.92);padding:8px 12px;border-radius:10px;font-weight:800;color:#024;box-shadow:0 6px 18px rgba(0,0,0,0.12);z-index:60}

/* Mobile-friendly flap button (visible on small screens) */
.mobile-flap{position:fixed;right:16px;bottom:16px;width:72px;height:72px;border-radius:50%;background:linear-gradient(#ffbf33,#ffd633);border:none;box-shadow:0 8px 20px rgba(0,0,0,0.18);font-size:18px;font-weight:800;color:#222;z-index:60;cursor:pointer}
@media(min-width:481px){ .mobile-flap{display:none} }

/* Make HUD and buttons larger on small screens */
@media(max-width:480px){
	.hud {margin-top:6px}
	#score{font-size:18px}
	#msg{font-size:14px}
	.diff-btn{padding:8px 12px}
	.admin-btn{right:10px;bottom:10px}
}