:root{--bg:#0a0a0b;--surface:#121214;--surface-hi:#191a1d;--line:#232327;--line-hi:#34343a;--text:#f1f1f2;--muted:#8b8b93;--faint:#5a5a61;--good:#6bbf8a;--bad:#d4696a;--radius:12px;--ease:cubic-bezier(.3, .8, .4, 1);--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark;-webkit-font-smoothing:antialiased;-webkit-tap-highlight-color:transparent;font-family:ui-sans-serif,-apple-system,BlinkMacSystemFont,Segoe UI,Inter,system-ui,sans-serif}*{box-sizing:border-box}html,body,#root{height:100%}body{background:var(--bg);color:var(--text);margin:0;overflow-x:hidden}button,input{font:inherit;color:inherit}button{cursor:pointer;background:0 0;border:none}button:disabled{opacity:.35;cursor:default}.app{justify-content:center;min-height:100dvh;display:flex}.screen{width:100%;max-width:460px;padding:calc(28px + env(safe-area-inset-top)) 20px calc(24px + env(safe-area-inset-bottom));animation:fade-in .22s var(--ease) both}.app[data-nav=true] .screen{padding-bottom:calc(88px + 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var(--line);background:#0a0a0bdb;justify-content:center;gap:4px;display:flex;position:fixed;bottom:0;left:0;right:0}.nav__tab{max-width:150px;color:var(--faint);border-radius:10px;flex:1;padding:11px 8px;font-size:.82rem;transition:color .16s,background .16s}.nav__tab.is-on{background:var(--surface);color:var(--text)}.drill{height:100dvh;padding-top:calc(18px + env(safe-area-inset-top));flex-direction:column;display:flex}.drill__bar{justify-content:space-between;align-items:center;gap:12px;margin-bottom:14px;display:flex}.drill__exit{color:var(--muted);padding:6px 0;font-size:.85rem;transition:color .16s}.drill__exit:hover{color:var(--text)}.drill__meta{color:var(--faint);font-variant-numeric:tabular-nums;font-size:.8rem}.countdown{align-items:center;gap:10px;display:flex;position:relative}.countdown:before{content:"";background:var(--line);height:2px;position:absolute;left:0;right:44px}.countdown__bar{background:var(--muted);transform-origin:0;flex:1;height:2px;transition:background .3s linear;position:relative}.countdown[data-low=true] .countdown__bar{background:var(--bad)}.countdown__value{text-align:right;width:34px;color:var(--faint);font-variant-numeric:tabular-nums;font-size:.78rem}.countdown[data-low=true] .countdown__value{color:var(--bad)}.drill__stage{flex:1;justify-content:center;align-items:center;min-height:0;display:flex}.question{animation:fade-in .2s var(--ease) both;flex-direction:column;align-items:center;gap:14px;display:flex}.question__text{letter-spacing:-.02em;font-variant-numeric:tabular-nums;white-space:nowrap;color:var(--muted);font-size:clamp(2.2rem,10vw,3rem);font-weight:500}.question__answer{border-radius:var(--radius);border:1px solid var(--line);place-items:center;min-width:150px;min-height:68px;padding:6px 24px;transition:border-color .18s,background .18s;display:grid}.question__input{font-variant-numeric:tabular-nums;font-size:2.1rem;font-weight:560}.question__input.is-empty{color:var(--faint)}.question--right 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var(--ease);font-size:1.15rem}.pad__key:hover{background:var(--surface)}.pad__key:active{background:var(--surface-hi);border-color:var(--line-hi);transform:scale(.95)}.pad__key--muted{color:var(--muted)}.pad__key--go{background:var(--surface);border-color:var(--line-hi);font-size:.9rem}.pad__key--wide{grid-column:span 3;height:50px}@media (height<=700px){.pad__key{height:48px}.question__answer{min-height:58px}}@media (prefers-reduced-motion:reduce){*,:before,:after{transition-duration:.01ms!important;animation-duration:.01ms!important}}