*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{--bg:#e8e8e8;--text:#222;--header-bg:#f5f5f5;--header-border:#ccc;--surface:#fff;--surface-border:#ddd;--board-bg:#578a34;--board-alt:#4a7c2e;--snake:#3355dd;--snake-head:#2244bb;--food:#e63946;--accent:#4a90d9;--overlay-bg:rgba(0,0,0,0.55);--modal-bg:#fff;--modal-text:#222}
[data-theme="dark"]{--bg:#1a1a2e;--text:#e0e0e0;--header-bg:#16213e;--header-border:#0f3460;--surface:#1e293b;--surface-border:#334155;--board-bg:#2d5016;--board-alt:#264512;--snake:#5b8af5;--snake-head:#4070e0;--food:#ff6b6b;--overlay-bg:rgba(0,0,0,0.7);--modal-bg:#16213e;--modal-text:#e0e0e0}
html,body{height:100%;font-family:'Inter',sans-serif;background:var(--bg);color:var(--text);-webkit-user-select:none;user-select:none}
body{display:flex;justify-content:center}
.app{width:100%;max-width:500px;display:flex;flex-direction:column;align-items:center}
.app-header{width:100%;display:flex;align-items:center;justify-content:space-between;padding:12px 16px;background:var(--header-bg);border-bottom:1px solid var(--header-border)}
.app-title{font-size:1.25rem;font-weight:700}
.icon-btn{background:none;border:none;cursor:pointer;color:var(--text);padding:6px;border-radius:8px;display:flex;align-items:center;justify-content:center;width:36px;height:36px}
.icon-btn:hover{background:rgba(128,128,128,0.15)}
.icon-btn svg{width:20px;height:20px}
[data-theme="light"] .icon-moon{display:none}[data-theme="dark"] .icon-sun{display:none}[data-theme="dark"] .icon-moon{display:block}
.game-container{padding:16px;display:flex;flex-direction:column;align-items:center;gap:12px;width:100%}
.info-bar{display:flex;gap:16px}
.stat-box{background:var(--surface);border:1px solid var(--surface-border);border-radius:10px;padding:6px 16px;display:flex;align-items:center;gap:8px}
.stat-label{font-size:.7rem;font-weight:600;text-transform:uppercase;opacity:.6}
.stat-value{font-size:1.1rem;font-weight:700}
.board-wrapper{position:relative;border-radius:8px;overflow:hidden;border:3px solid var(--surface-border);line-height:0}
canvas{display:block}
.overlay{position:absolute;inset:0;background:var(--overlay-bg);display:flex;align-items:center;justify-content:center}
.overlay.hidden{display:none}
.overlay-inner{text-align:center;color:#fff}
.overlay-title{font-size:1.5rem;font-weight:700;margin-bottom:4px}
.overlay-sub{font-size:.85rem;opacity:.8;margin-bottom:12px}
.play-btn{padding:10px 32px;font-family:inherit;font-size:.9rem;font-weight:600;border:none;border-radius:10px;background:var(--accent);color:#fff;cursor:pointer}
.play-btn:hover{opacity:.9}
.dpad{display:none;position:relative;width:150px;height:150px}
.dpad-btn{position:absolute;width:50px;height:50px;border:1px solid var(--surface-border);border-radius:10px;background:var(--surface);color:var(--text);font-size:1.2rem;display:flex;align-items:center;justify-content:center;cursor:pointer}
.dpad-btn:active{background:var(--accent);color:#fff}
.dpad-btn.up{top:0;left:50px}
.dpad-btn.down{bottom:0;left:50px}
.dpad-btn.left{top:50px;left:0}
.dpad-btn.right{top:50px;right:0}
@media(hover:none)and(pointer:coarse){.dpad{display:block}}