@import"https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Space+Grotesk:wght@500;600;700&display=swap";.leaderboard{width:100%}.leaderboard-title{font-size:.78rem;text-transform:uppercase;letter-spacing:.12em;color:var(--text-lo);margin-bottom:10px;text-align:center}.leaderboard-empty{text-align:center;color:var(--text-lo);font-size:.92rem;padding:6px 0}.leaderboard-list{list-style:none;display:flex;flex-direction:column;gap:8px}.leaderboard-row{display:grid;grid-template-columns:44px 1fr auto;align-items:center;gap:12px;padding:12px 14px;border-radius:var(--radius-sm);background:var(--surface);border:1px solid var(--surface-border)}.leaderboard-row .rank{font-size:1.25rem;text-align:center}.leaderboard-row .time{font-family:var(--font-display);font-weight:600;font-size:1.2rem;color:var(--text-hi)}.leaderboard-row .date{font-size:.82rem;color:var(--text-lo)}.leaderboard-row.is-new{border-color:var(--gold);box-shadow:0 0 0 1px var(--gold),0 6px 18px #00000040;animation:pop-new .5s var(--ease-spring) both}@keyframes pop-new{0%{transform:scale(.9);opacity:0}to{transform:none;opacity:1}}.menu{gap:18px}.menu-top{display:flex;justify-content:flex-end;min-height:44px}.theme-toggle{width:44px;height:44px;border-radius:50%;background:var(--surface);border:1px solid var(--surface-border);font-size:1.25rem;display:grid;place-items:center;transition:transform .12s var(--ease-spring),background .2s ease}.theme-toggle:active{transform:scale(.9)}.menu-section{display:flex;flex-direction:column;gap:10px}.section-label{font-size:.78rem;text-transform:uppercase;letter-spacing:.12em;color:var(--text-lo);font-weight:600}.segmented{display:grid;grid-template-columns:1fr 1fr;gap:10px}.segmented.row{grid-template-columns:repeat(3,1fr)}.segment{padding:16px 10px;border-radius:var(--radius-sm);background:var(--surface);border:1px solid var(--surface-border);color:var(--text-mid);font-weight:600;font-size:.95rem;line-height:1.2;transition:transform .1s var(--ease-spring),color .2s ease,border-color .2s ease,background .2s ease}.segment:active{transform:scale(.96)}.segment.is-active{color:#fff;border-color:transparent;background:var(--accent-grad);box-shadow:0 8px 22px -8px var(--accent)}.menu-section.board{margin-top:2px}.btn-primary{padding:20px;border-radius:var(--radius-md);background:var(--accent-grad);color:#fff;font-family:var(--font-display);font-weight:700;font-size:1.25rem;letter-spacing:.01em;box-shadow:0 14px 30px -10px var(--accent);transition:transform .12s var(--ease-spring)}.btn-primary:active{transform:scale(.97)}.start{margin-top:auto}.keypad{--kp-gap: 12px;display:grid;grid-template-columns:repeat(3,1fr);gap:var(--kp-gap);width:100%}.keypad-spacer{pointer-events:none}.key{width:100%;aspect-ratio:1 / 1;max-height:calc((44dvh - 3 * var(--kp-gap)) / 4);border-radius:var(--radius-md);background:var(--key-bg);border:1px solid var(--key-border);color:var(--text-hi);font-family:var(--font-display);font-weight:600;font-size:clamp(1.6rem,7.5vw,2.5rem);box-shadow:var(--shadow-key);transition:transform .09s var(--ease-spring),background .15s ease,box-shadow .15s ease;touch-action:manipulation}.key:active{transform:scale(.93);background:var(--surface-strong);box-shadow:0 2px 8px #0006}.key:disabled{opacity:.5}@media (max-height: 680px){.keypad{--kp-gap: 9px}}.game{gap:16px;overflow:hidden}.game-bar{display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:10px}.chip{justify-self:start;padding:10px 16px;border-radius:999px;background:var(--surface);border:1px solid var(--surface-border);color:var(--text-mid);font-weight:600;font-size:.9rem;transition:transform .1s var(--ease-spring)}.game-bar .chip:last-child{justify-self:end}.chip:active{transform:scale(.94)}.timer{font-family:var(--font-display);font-weight:600;font-size:1.5rem;font-variant-numeric:tabular-nums;color:var(--text-hi);text-align:center;min-width:6ch}.progress{display:flex;gap:6px;justify-content:center}.dot{width:100%;max-width:26px;height:6px;border-radius:999px;background:var(--surface-strong);transition:background .3s ease}.dot.done{background:var(--correct)}.dot.active{background:var(--accent)}.question-area{flex:1;min-height:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:16px}.operation{display:flex;align-items:center;gap:clamp(12px,4vw,24px);font-family:var(--font-display);font-weight:700;font-size:clamp(3.4rem,17vw,5.5rem);line-height:1;color:var(--text-hi);transition:color .15s ease,transform .15s var(--ease-spring)}.operation .operator{color:var(--accent)}.operation.is-correct{color:var(--correct);animation:bump .28s var(--ease-spring)}.operation.is-wrong{animation:shake .28s ease}@keyframes bump{50%{transform:scale(1.08)}}@keyframes shake{0%,to{transform:translate(0)}25%{transform:translate(-10px)}75%{transform:translate(10px)}}.input-echo{font-family:var(--font-display);font-weight:600;font-size:clamp(2rem,9vw,2.8rem);min-height:1.2em;letter-spacing:.06em;color:var(--text-hi);font-variant-numeric:tabular-nums}.input-echo.empty{color:var(--text-lo)}.flash{position:absolute;top:0;right:0;bottom:0;left:0;pointer-events:none;z-index:5;border-radius:inherit;animation:flash-fade .26s ease-out forwards}.flash-correct{background:radial-gradient(120% 80% at 50% 50%,var(--correct-glow),transparent 70%)}.flash-incorrect{background:radial-gradient(120% 80% at 50% 50%,var(--wrong-glow),transparent 70%)}@keyframes flash-fade{0%{opacity:1}to{opacity:0}}.results{gap:22px;justify-content:center}.results-hero{text-align:center;display:flex;flex-direction:column;align-items:center;gap:6px;margin-top:auto}.new-best-badge{padding:8px 18px;border-radius:999px;background:var(--gold);color:#241a00;font-weight:700;font-size:.95rem;margin-bottom:10px;box-shadow:0 10px 26px -8px var(--gold);animation:badge-in .5s var(--ease-spring) both}@keyframes badge-in{0%{transform:scale(.6) translateY(-8px);opacity:0}to{transform:none;opacity:1}}.results-caption{color:var(--text-mid);font-size:.9rem;letter-spacing:.03em}.final-time{font-family:var(--font-display);font-weight:700;font-size:clamp(3.6rem,20vw,5.5rem);line-height:1;background:var(--accent-grad);-webkit-background-clip:text;background-clip:text;color:transparent;font-variant-numeric:tabular-nums}.results-sub{color:var(--text-lo);font-size:.9rem}.results-board{width:100%}.results-actions{display:flex;flex-direction:column;gap:12px;margin-top:auto}.btn-ghost{padding:16px;border-radius:var(--radius-md);background:var(--surface);border:1px solid var(--surface-border);color:var(--text-mid);font-weight:600;font-size:1.05rem;transition:transform .12s var(--ease-spring)}.btn-ghost:active{transform:scale(.97)}:root{--radius-lg: 28px;--radius-md: 18px;--radius-sm: 12px;--font-display: "Space Grotesk", "Segoe UI", system-ui, -apple-system, sans-serif;--font-body: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;--ease-spring: cubic-bezier(.34, 1.56, .64, 1)}:root,[data-theme=dark]{--bg-0: #070a12;--bg-1: #0b0f1a;--bg-grad: radial-gradient(120% 80% at 50% -10%, #16203a 0%, #0b0f1a 55%, #070a12 100%);--surface: rgba(255, 255, 255, .045);--surface-strong: rgba(255, 255, 255, .08);--surface-border: rgba(255, 255, 255, .09);--text-hi: #f4f7ff;--text-mid: #aeb8d4;--text-lo: #6b7699;--accent: #6ea8ff;--accent-2: #9b7bff;--accent-grad: linear-gradient(135deg, #6ea8ff 0%, #9b7bff 100%);--correct: #34e2a0;--correct-glow: rgba(52, 226, 160, .5);--wrong: #ff5c72;--wrong-glow: rgba(255, 92, 114, .5);--key-bg: rgba(255, 255, 255, .06);--key-border: rgba(255, 255, 255, .1);--shadow-key: 0 8px 20px rgba(0, 0, 0, .45);--gold: #ffd479}[data-theme=light]{--bg-0: #eef1f8;--bg-1: #f6f8fd;--bg-grad: radial-gradient(120% 80% at 50% -10%, #ffffff 0%, #eef2fb 55%, #e4e9f5 100%);--surface: rgba(20, 30, 60, .04);--surface-strong: rgba(20, 30, 60, .07);--surface-border: rgba(20, 30, 60, .1);--text-hi: #131a2e;--text-mid: #4a566f;--text-lo: #8390ad;--accent: #3f6fe0;--accent-2: #7a52e0;--accent-grad: linear-gradient(135deg, #3f6fe0 0%, #7a52e0 100%);--correct: #12b981;--correct-glow: rgba(18, 185, 129, .35);--wrong: #e23a52;--wrong-glow: rgba(226, 58, 82, .32);--key-bg: #ffffff;--key-border: rgba(20, 30, 60, .09);--shadow-key: 0 6px 16px rgba(30, 45, 90, .14);--gold: #e0a530}*{box-sizing:border-box;margin:0;padding:0;-webkit-tap-highlight-color:transparent}html,body,#root{height:100%}body{font-family:var(--font-body);color:var(--text-hi);background:var(--bg-grad);background-attachment:fixed;overscroll-behavior:none;-webkit-font-smoothing:antialiased;-webkit-user-select:none;user-select:none;transition:background .4s ease}#root{display:flex;justify-content:center}.app{position:relative;width:100%;max-width:520px;min-height:100dvh;padding:calc(env(safe-area-inset-top) + 20px) 20px calc(env(safe-area-inset-bottom) + 20px);background:transparent;display:flex;flex-direction:column}button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}.screen{flex:1;display:flex;flex-direction:column;animation:screen-in .42s var(--ease-spring) both}@keyframes screen-in{0%{opacity:0;transform:translateY(14px) scale(.985)}to{opacity:1;transform:none}}.brand{text-align:center;margin-bottom:8px}.brand h1{font-family:var(--font-display);font-weight:700;font-size:clamp(2.1rem,10vw,3rem);letter-spacing:-.02em;line-height:1;background:var(--accent-grad);-webkit-background-clip:text;background-clip:text;color:transparent}.brand p{margin-top:8px;color:var(--text-mid);font-size:.95rem;letter-spacing:.02em}.card{background:var(--surface);border:1px solid var(--surface-border);border-radius:var(--radius-md);padding:16px;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px)}