:root{color:#effffb;font-synthesis:none;--ink:#071b26;--mint:#60efd0;--gold:#ffd478;--muted:#a9c4cd;--line:#244651;--safe-top:env(safe-area-inset-top,0px);--safe-bottom:env(safe-area-inset-bottom,0px);background:#04131d;font-family:Noto Sans JP,system-ui,-apple-system,Segoe UI,sans-serif}*{box-sizing:border-box}body{place-items:center;min-height:100dvh;margin:0;display:grid;overflow:hidden}button{font:inherit;color:inherit;cursor:pointer;-webkit-tap-highlight-color:transparent;touch-action:manipulation}button:disabled{cursor:default;opacity:.44}button:focus-visible,[tabindex]:focus-visible{outline-offset:3px;outline:3px solid #fff4be}button:active:not(:disabled){filter:brightness(1.18)}[hidden]{display:none!important}h1,h2,p{margin:0}button,main{-webkit-user-select:none;user-select:none}.game-shell{isolation:isolate;background:var(--ink);width:min(100vw,540px);height:100dvh;max-height:1080px;position:relative;overflow:hidden;box-shadow:0 0 0 1px #17343f,0 20px 90px #0009}#viewport{position:absolute;inset:0}#viewport canvas{width:100%;height:100%;display:block}#hud{pointer-events:none;position:absolute;inset:0}.game-header{min-height:16.5%;padding:calc(10px + var(--safe-top)) 20px 12px;pointer-events:auto;background:#071b26f7;border-bottom:1px solid #41646b66;position:absolute;top:0;left:0;right:0}.header-top{justify-content:space-between;align-items:center;gap:12px;height:27px;display:flex}.wordmark{color:var(--mint);letter-spacing:.22em;font-size:10px;font-weight:900}.quiet-button{background:#143443;border:1px solid #345762;border-radius:5px;min-width:56px;min-height:36px;padding:7px 13px;font-size:12px;font-weight:700}.stage-heading{align-items:baseline;gap:10px;min-width:0;margin:9px 0 8px;display:flex}.stage-heading>span{letter-spacing:.04em;color:var(--mint);white-space:nowrap;font-size:12px;font-weight:800}.stage-heading h1{letter-spacing:.015em;font-size:clamp(15px,3.7vw,21px);line-height:1.35}.stage-progress{gap:5px;margin:0 0 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