:root{color-scheme:dark;font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif}*{box-sizing:border-box;touch-action:manipulation;-webkit-tap-highlight-color:transparent}html,body{margin:0;width:100%;height:100%;overflow:hidden;background:#0f172a}body{display:block}#game-canvas{width:100vw;height:100dvh;display:block}.overlay-screen{position:fixed;inset:0;display:flex;align-items:center;justify-content:center;background:#020617c7;z-index:20}.overlay-hidden{display:none!important}.menu-panel{width:min(90vw,520px);border:1px solid rgba(148,163,184,.35);border-radius:18px;background:#0f172af2;box-shadow:0 20px 50px #00000059;padding:24px 18px;color:#e2e8f0}#game-logo{width:min(280px,70vw);display:block;margin:0 auto 18px}.menu-buttons{display:grid;gap:12px}.menu-emoji{font-size:2em;line-height:0;vertical-align:middle}button{appearance:none;border:0;border-radius:12px;padding:13px 16px;font-size:1rem;font-weight:700;color:#0f172a;background:#e2e8f0;cursor:pointer}button:active{transform:translateY(1px)}.game-over-actions{position:fixed;left:50%;bottom:max(18px,env(safe-area-inset-bottom));transform:translate(-50%);z-index:30;display:flex;gap:14px;padding:10px 12px;border-radius:999px;border:1px solid rgba(148,163,184,.35);background:#0f172aeb;box-shadow:0 10px 30px #00000059}.game-over-actions button{width:54px;height:54px;border-radius:999px;padding:0;display:grid;place-items:center;background:#e2e8f0;color:#0f172a}.game-over-actions svg{width:26px;height:26px}.infinite-end-button{position:fixed;top:max(12px,env(safe-area-inset-top));left:50%;transform:translate(-50%);z-index:26;width:52px;height:52px;border-radius:999px;padding:0;display:grid;place-items:center;font-size:1.45rem;border:1px solid rgba(148,163,184,.35);background:#0f172ae6;color:#e2e8f0}.infinite-end-button:active{transform:translate(-50%)}#how-to-play-modal{background:#0206176b}#how-to-bg-canvas{position:absolute;inset:0;width:100%;height:100%;display:block}.howto-dialog{position:relative;z-index:1;width:min(88vw,540px);border-radius:18px;border:1px solid rgba(148,163,184,.45);background:#0f172a9e;box-shadow:0 20px 50px #00000061;-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);padding:22px 18px;text-align:center}.howto-dialog p{margin:0 0 14px;line-height:1.45;font-size:clamp(1.02rem,1.8vw,1.2rem);color:#e2e8f0}