:root{--bg: #0a0c10;--ink: #e7ecf3;--dim: #8a94a6;--accent: #5fd0c5;--gold: #ffce6b;--warn: #ff5d6c;--card: #12151c;--line: #1e2430;font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,sans-serif}*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}[hidden]{display:none!important}html,body{margin:0;height:100%;background:var(--bg);color:var(--ink);overscroll-behavior:none}body{position:fixed;inset:0;overflow:hidden}.stage{position:fixed;inset:0;display:flex;align-items:center;justify-content:center}canvas{display:block}.intro{position:fixed;inset:0;display:flex;align-items:center;justify-content:center;padding:calc(env(safe-area-inset-top) + 20px) 20px calc(env(safe-area-inset-bottom) + 20px);background:radial-gradient(120% 90% at 50% 0%,#11161f 0%,var(--bg) 70%);transition:opacity .5s ease}.intro.gone{opacity:0;pointer-events:none}.card{width:100%;max-width:400px;text-align:center}.mark{width:56px;height:56px;margin:0 auto 20px;border-radius:50%;background:radial-gradient(circle at 50% 42%,var(--accent),#1d6f68 70%,transparent 72%);box-shadow:0 0 40px #5fd0c559;animation:breathe 3.2s ease-in-out infinite}@keyframes breathe{0%,to{transform:scale(1);opacity:.9}50%{transform:scale(1.08);opacity:1}}h1{font-size:24px;font-weight:680;letter-spacing:.3px;margin:0 0 10px}.lede{font-size:14px;line-height:1.55;color:var(--dim);margin:0 auto 26px;max-width:340px}.reqs{list-style:none;margin:0 0 26px;padding:0;text-align:left;display:flex;flex-direction:column;gap:12px}.reqs li{display:flex;gap:13px;align-items:flex-start;background:var(--card);border:1px solid var(--line);border-radius:13px;padding:13px 15px}.reqs .ico{font-size:20px;line-height:1.3;flex:none}.reqs b{font-size:14px;font-weight:620}.reqs span{font-size:12.5px;color:var(--dim);line-height:1.5}.btn{width:100%;padding:16px;border:none;border-radius:14px;background:var(--accent);color:#06201d;font-size:16px;font-weight:700;letter-spacing:.2px;cursor:pointer;transition:transform .08s ease,opacity .2s ease}.btn:active{transform:scale(.98)}.btn.busy{opacity:.6}#start{background:var(--gold)}.status{min-height:20px;margin-top:14px;font-size:13px;color:var(--dim)}.status.ok{color:var(--accent)}.status.err{color:var(--warn)}.link{margin-top:16px;background:none;border:none;color:var(--dim);font-size:13px;text-decoration:underline;cursor:pointer}.calib{position:fixed;inset:0;z-index:5;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:24px;background:radial-gradient(120% 90% at 50% 40%,#11161f 0%,var(--bg) 75%)}.cal-arrow{font-size:96px;line-height:1;color:var(--accent);opacity:0}.cal-arrow.show{animation:nudge 1.3s ease-in-out infinite}@keyframes nudge{0%,to{opacity:.5;transform:scale(.96)}50%{opacity:1;transform:scale(1.12)}}.cal-text{font-size:17px;font-weight:600;color:var(--ink);text-align:center;padding:0 28px}