*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{--bg:#e8e8e8;--text:#222;--header-bg:#f5f5f5;--header-border:#ccc;--surface:#fff;--canvas-bg:#1a1a2e;--accent:#4a90d9;--overlay-bg:rgba(0,0,0,0.6)}
[data-theme="dark"]{--bg:#1a1a2e;--text:#e0e0e0;--header-bg:#16213e;--header-border:#0f3460;--surface:#1e293b;--canvas-bg:#0a0a1a;--overlay-bg:rgba(0,0,0,0.7)}
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:520px;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:12px;display:flex;flex-direction:column;align-items:center;gap:10px;width:100%}
.info-bar{display:flex;gap:16px;font-size:.85rem}
.stat b{font-weight:700}
.canvas-wrap{position:relative;width:100%;max-width:480px;border-radius:8px;overflow:hidden;border:2px solid var(--header-border);line-height:0}
canvas{display:block;width:100%;height:auto;background:var(--canvas-bg)}
.overlay{position:absolute;inset:0;background:var(--overlay-bg);display:flex;align-items:center;justify-content:center}
.overlay.hidden{display:none}
.overlay-text{color:#fff;font-size:1.2rem;font-weight:700;text-align:center;line-height:1.6}