/* 반응속도 테스트 — 측정 칸 */
.rt-stage { display: grid; place-content: center; gap: 8px; min-height: 260px; padding: 24px; border-radius: var(--r); background: var(--fill); color: var(--ink); text-align: center; cursor: pointer; user-select: none; -webkit-user-select: none; touch-action: manipulation; -webkit-tap-highlight-color: transparent; }
.rt-stage b { font-size: 26px; font-weight: 700; }
.rt-stage span { font-size: 14px; line-height: 1.55; color: inherit; opacity: .85; }
.rt-stage:focus-visible { outline: 2px solid var(--blue); outline-offset: 3px; }
.rt-stage[data-st="wait"] { background: #a34040; color: #fff; }
.rt-stage[data-st="go"] { background: #2f7d4a; color: #fff; }
.rt-stage[data-st="early"] { background: #fff4e5; color: #8a4b00; }
.rt-stage[data-st="shown"] { background: var(--blue-bg); color: var(--ink); }
.rt-stage[data-st="end"] { background: var(--blue-bg); }
@media (max-width: 720px) { .rt-stage { min-height: 220px; } .rt-stage b { font-size: 22px; } }