:root{--hud:#beebffd9;--hud-dim:#beebff73;--font:"Segoe UI", "Helvetica Neue", Arial, sans-serif;--mono:"SF Mono", "Cascadia Mono", Consolas, monospace}*{box-sizing:border-box}html,body{overscroll-behavior:none;height:100%;font-family:var(--font);color:var(--hud);-webkit-user-select:none;user-select:none;background:#02111c;margin:0;overflow:hidden}#scene{cursor:none;touch-action:none;-webkit-touch-callout:none;-webkit-tap-highlight-color:transparent;width:100vw;height:100vh;display:block}#hud{pointer-events:none;opacity:0;text-shadow:0 0 12px #78dcff59;transition:opacity 1.4s;position:fixed;inset:0}#hud.on{opacity:1}.hud-corner{padding:26px 32px;position:absolute}.hud-tl{top:0;left:0}.hud-tr{text-align:right;padding-top:82px;top:0;right:0}.hud-bl{bottom:0;left:0}.hud-br{text-align:right;bottom:0;right:0}.hud-label{letter-spacing:.32em;color:var(--hud-dim);font-size:10px}.hud-value{font-family:var(--mono);font-size:30px;font-weight:300;line-height:1.15}.hud-unit{color:var(--hud-dim);margin-left:4px;font-size:13px}.hud-sub{letter-spacing:.15em;color:var(--hud-dim);text-transform:uppercase;font-size:11px}.hud-btn{top:calc(env(safe-area-inset-top,0px) + 18px);right:calc(env(safe-area-inset-right,0px) + 26px);width:40px;height:40px;color:var(--hud);cursor:pointer;pointer-events:auto;-webkit-tap-highlight-color:transparent;touch-action:manipulation;background:#02111c8c;border:1px solid #a0e1ff59;border-radius:50%;place-items:center;padding:0;transition:background .2s,border-color .2s,color .2s,transform .12s;display:grid;position:fixed}.hud-btn:before{content:"";width:44px;height:44px;position:absolute;top:50%;left:50%;transform:translate(-50%,-50%)}.hud-btn:hover{color:#d9f4ff;background:#0c3048b3;border-color:#a0e1ff99}.hud-btn:active{transform:scale(.92)}.hud-btn:focus-visible{outline-offset:3px;outline:1px solid #a0e1ffcc}.hud-btn svg{pointer-events:none;display:block}.hud-btn .icon-off{display:none}.hud-btn.muted{color:var(--hud-dim);border-color:#a0e1ff38}.hud-btn.muted .icon-on{display:none}.hud-btn.muted .icon-off{display:block}body.touch .hud-btn,body.touch .hud-btn:before{width:48px;height:48px}body.touch .hud-btn svg{width:26px;height:26px}#overlay{-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);z-index:10;background:radial-gradient(at 50% 30%,#083c5a8c,#010a14eb 70%);place-items:center;transition:opacity 1.6s;display:grid;position:fixed;inset:0}#overlay.hidden{opacity:0;pointer-events:none}.overlay-card{text-align:center;max-width:560px;padding:40px 32px}.overlay-card h1{letter-spacing:.35em;color:#d9f4ff;text-shadow:0 0 30px #5ac8ff8c;margin:0 0 6px .35em;font-size:54px;font-weight:200}.tagline{color:var(--hud-dim);letter-spacing:.08em;margin:0 0 36px;font-size:14px}#dive-btn{font:inherit;letter-spacing:.3em;color:#d9f4ff;cursor:pointer;background:0 0;border:1px solid #a0e1ff80;padding:16px 38px 16px calc(38px + .3em);font-size:13px;transition:all .25s}#dive-btn:hover{background:#78d2ff1f;box-shadow:0 0 30px #5ac8ff4d}.controls{color:var(--hud-dim);text-align:left;grid-template-columns:1fr 1fr;gap:10px 24px;margin-top:40px;font-size:12px;display:grid}kbd{font-family:var(--mono);color:var(--hud);border:1px solid #a0e1ff59;border-radius:3px;margin-right:6px;padding:3px 7px;font-size:10px;display:inline-block}.hint{color:#beebff59;letter-spacing:.05em;margin-top:34px;font-size:11px}.touch-controls{letter-spacing:.12em;color:var(--hud-dim);margin-top:40px;font-size:13px;display:none}body.touch .controls{display:none}body.touch .touch-controls{display:block}@media (width<=700px){.hud-corner{padding:14px 16px}.hud-tl{top:env(safe-area-inset-top,0px);left:env(safe-area-inset-left,0px)}.hud-tr{top:env(safe-area-inset-top,0px);right:env(safe-area-inset-right,0px);padding-top:74px}.hud-btn{top:calc(env(safe-area-inset-top,0px) + 12px);right:calc(env(safe-area-inset-right,0px) + 14px)}.hud-bl{bottom:env(safe-area-inset-bottom,0px);left:env(safe-area-inset-left,0px)}.hud-br{bottom:env(safe-area-inset-bottom,0px);right:env(safe-area-inset-right,0px)}.hud-label{letter-spacing:.22em;font-size:8px}.hud-value{font-size:20px}.hud-unit{margin-left:3px;font-size:10px}.hud-sub{letter-spacing:.1em;font-size:9px}.overlay-card{padding:28px 20px;padding-left:max(20px, env(safe-area-inset-left,0px));padding-right:max(20px, env(safe-area-inset-right,0px))}.overlay-card h1{letter-spacing:.22em;margin-bottom:8px;font-size:30px}.tagline{margin-bottom:26px;font-size:12px}#dive-btn{padding:18px 28px 18px calc(28px + .3em);font-size:12px}.controls{grid-template-columns:1fr;gap:8px;margin-top:26px;font-size:11px}.touch-controls{margin-top:26px;font-size:12px}.hint{margin-top:22px;font-size:10px}}