:root{color-scheme:light;font-family:Avenir Next,Trebuchet MS,Segoe UI,sans-serif;line-height:1.45;font-weight:400;--page-bg: #f5f1e8;--page-bg-deep: #eee6d8;--surface: rgba(255, 253, 248, .96);--surface-muted: #f7f2e9;--surface-raised: #fffdfa;--border: #ddd2c0;--border-strong: #cab9a2;--text: #20303d;--text-soft: #5f707b;--accent: #35556b;--accent-strong: #284457;--accent-soft: #dbe5eb;--warm: #b76c49;--warm-soft: #f1e2d8;--success: #5f8569;--success-soft: #e6efe8;--danger: #9a4f4f;--danger-soft: #f3e4e4;--safe-top: env(safe-area-inset-top, 0px);--safe-right: env(safe-area-inset-right, 0px);--safe-bottom: env(safe-area-inset-bottom, 0px);--safe-left: env(safe-area-inset-left, 0px);--pad-gap: 10px;--panel-pad: 16px;background:radial-gradient(circle at top,rgba(255,255,255,.82),transparent 28rem),linear-gradient(180deg,var(--page-bg) 0%,var(--page-bg-deep) 100%);color:var(--text)}*{box-sizing:border-box}html{min-height:100%;max-width:100%;overflow-x:clip}body{margin:0;min-width:320px;max-width:100%;min-height:100dvh;overflow-x:clip;color:var(--text);background:radial-gradient(circle at top,rgba(255,255,255,.82),transparent 28rem),linear-gradient(180deg,var(--page-bg) 0%,var(--page-bg-deep) 100%);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;touch-action:manipulation;-webkit-tap-highlight-color:transparent;-webkit-user-select:none;user-select:none}button{font:inherit;-webkit-tap-highlight-color:transparent}button:focus-visible{outline:3px solid rgba(53,85,107,.24);outline-offset:3px}#app{min-height:100dvh}.page-shell{width:min(1100px,calc(100% - 16px));max-width:100%;margin:0 auto;padding:max(8px,var(--safe-top)) max(8px,var(--safe-right)) max(8px,var(--safe-bottom)) max(8px,var(--safe-left))}.game-panel{display:flex;flex-direction:column;gap:12px;width:100%;max-width:100%;border:1px solid var(--border);border-radius:28px;background:var(--surface);box-shadow:0 18px 40px #20303d14;min-height:calc(100dvh - 16px - var(--safe-top) - var(--safe-bottom));padding:var(--panel-pad);overflow-x:clip}.toolbar{display:grid;grid-template-columns:auto minmax(0,1fr) auto;align-items:center;gap:10px;flex-shrink:0}.game-title{margin:0;color:var(--text);font-size:clamp(1.45rem,2.8vw,2.1rem);line-height:.94;letter-spacing:-.05em;white-space:nowrap}.mode-picker{display:flex;flex-wrap:wrap;gap:8px;justify-content:center}.mode-button,.restart-button{border-radius:999px;padding:10px 16px;font-weight:700;cursor:pointer;transition:transform .14s ease,background-color .14s ease,color .14s ease,border-color .14s ease,box-shadow .14s ease}.mode-button{display:inline-flex;align-items:center;gap:6px;border:1px solid var(--border);background:var(--surface-muted);color:var(--accent);box-shadow:inset 0 -1px #fffc}.mode-symbol{font-size:1.05em;line-height:1;font-weight:700}.mode-button.is-active{border-color:var(--warm);background:var(--warm-soft);color:var(--warm);box-shadow:0 8px 18px #b76c4924}.restart-button{border:1px solid transparent;background:var(--accent);color:#f9fbfd;box-shadow:0 10px 24px #35556b29}.mode-button:hover:not(.is-active),.restart-button:hover{transform:translateY(-1px)}.restart-button:hover{background:var(--accent-strong)}.mode-button:active,.restart-button:active{transform:translateY(0) scale(.98)}.play-layout{display:grid;grid-template-columns:minmax(0,1fr);grid-template-rows:auto minmax(0,1fr);gap:12px;flex:1;min-height:0;align-content:stretch}.prompt-column{display:flex;flex-direction:column;gap:10px;min-width:0;min-height:0}.pad-column{display:flex;flex-direction:column;align-items:center;justify-content:stretch;gap:10px;min-width:0;min-height:0}.stats-row{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:8px;flex-shrink:0}.stat-card{display:flex;flex-direction:column;align-items:center;gap:2px;padding:10px 8px;border:1px solid var(--border);border-radius:16px;background:var(--surface-muted);transition:background-color .2s ease,border-color .2s ease,box-shadow .2s ease}.stat-card.is-pulse{animation:stat-pulse .45s ease}.stat-card.is-hot{border-color:#b76c4959;background:var(--warm-soft)}.stat-label{font-size:.72rem;text-transform:uppercase;letter-spacing:.08em;color:var(--text-soft)}.stat-card strong{font-size:clamp(1.1rem,2.5vw,1.35rem);letter-spacing:-.03em;font-variant-numeric:tabular-nums;color:var(--text)}.stat-card.is-hot strong{color:var(--warm)}.message{margin:0;min-height:1.4em;text-align:center;color:var(--accent);font-size:clamp(.95rem,2vw,1.05rem);font-weight:700;flex-shrink:0}.message.is-good{color:var(--success)}.message.is-bad{color:var(--danger)}.message.is-level-up{color:var(--warm)}.question-stage{position:relative;flex:0 0 auto;display:flex;align-items:center;justify-content:center;min-height:0}.question-card{position:relative;display:flex;align-items:center;justify-content:center;flex-wrap:wrap;gap:clamp(10px,2.5vw,18px);width:100%;min-height:clamp(100px,16vh,160px);border:1px solid var(--border);border-radius:24px;background:var(--surface-muted);padding:clamp(16px,2.8vh,28px) clamp(12px,3vw,24px);font-size:clamp(2.4rem,9vw,4.2rem);font-weight:700;font-variant-numeric:tabular-nums;letter-spacing:-.03em;line-height:1.1;box-shadow:inset 0 1px #ffffffbf;transition:background-color .18s ease,border-color .18s ease,box-shadow .18s ease}.question-card.is-enter{animation:question-enter .38s ease}.question-card.is-correct{animation:pop .5s ease;background:var(--success-soft);border-color:#5f856973;box-shadow:0 10px 28px #5f85691f}.question-card.is-wrong{animation:shake .42s ease;background:var(--danger-soft);border-color:#9a4f4f66}.question-card.is-level-up{animation:level-up-glow .7s ease;background:var(--warm-soft);border-color:#b76c4966;box-shadow:0 12px 30px #b76c4924}.question-text{color:var(--text)}.question-equals{color:var(--text-soft);font-weight:600}.answer-display{position:relative;min-width:2.4ch;min-height:1.15em;padding:0 .12em .04em;text-align:center;border-bottom:4px solid var(--accent);color:var(--accent-strong);transition:color .12s ease}.answer-display.is-empty{color:var(--border-strong)}.answer-display.is-tick{animation:digit-tick .16s ease}.answer-display.is-empty:after{content:"";position:absolute;right:.15ch;bottom:.12em;width:.08em;height:.85em;background:var(--accent);opacity:.55;animation:caret-blink 1s steps(1) infinite}.float-layer{position:absolute;inset:0;pointer-events:none;overflow:visible;z-index:2}.float-chip{position:absolute;left:50%;top:42%;transform:translate(-50%);padding:6px 14px;border-radius:999px;font-size:clamp(1rem,2.8vw,1.25rem);font-weight:800;letter-spacing:-.02em;white-space:nowrap;animation:float-up .9s ease forwards;box-shadow:0 8px 20px #20303d1a}.float-chip.is-points{background:var(--success);color:#f7fbf8}.float-chip.is-streak{background:var(--warm);color:#fffaf6;animation-delay:80ms}.float-chip.is-level{top:28%;background:var(--accent);color:#f7fafc;font-size:clamp(1.1rem,3vw,1.4rem);padding:8px 18px}.level-progress{display:flex;flex-direction:column;align-items:center;gap:8px;flex-shrink:0}.progress-caption{font-size:.72rem;text-transform:uppercase;letter-spacing:.1em;color:var(--text-soft);font-weight:600}.progress-dots{display:flex;justify-content:center;gap:12px}.progress-dot{width:14px;height:14px;border-radius:50%;border:2px solid var(--border-strong);background:var(--surface-muted);transition:background .22s ease,border-color .22s ease,transform .22s ease,box-shadow .22s ease}.progress-dot.is-filled{background:var(--success);border-color:var(--success);box-shadow:0 0 0 3px #5f856924;transform:scale(1.08)}.progress-dot.is-just-filled{animation:dot-pop .35s ease}.number-pad{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:var(--pad-gap);width:min(100%,400px);flex:1 1 auto;min-height:220px;max-height:100%}.number-button{display:grid;place-items:center;min-height:0;border:1px solid var(--border-strong);border-radius:18px;background:var(--surface-raised);color:var(--text);font-size:clamp(1.55rem,4.5vw,2rem);font-weight:700;font-variant-numeric:tabular-nums;cursor:pointer;touch-action:manipulation;box-shadow:0 1px #ffffffe6 inset,0 6px 14px #20303d0f;transition:background-color .1s ease,border-color .1s ease,color .1s ease,transform 80ms ease,box-shadow .1s ease}.number-button:hover{background:var(--accent-soft);border-color:var(--accent);color:var(--accent-strong)}.number-button:active,.number-button.is-pressed{transform:scale(.94);background:var(--accent-soft);box-shadow:0 1px #ffffff80 inset,0 2px 6px #20303d14}.pad-tool{color:var(--text-soft);font-size:clamp(1.35rem,4vw,1.7rem)}.pad-submit{background:var(--accent);border-color:var(--accent-strong);color:#fdfbf6;box-shadow:0 1px #ffffff2e inset,0 8px 18px #35556b2e}.pad-submit:hover{background:var(--accent-strong);color:#fdfbf6;border-color:var(--accent-strong)}.pad-submit:active,.pad-submit.is-pressed{background:var(--accent-strong);color:#fdfbf6}.pad-submit.is-ready{animation:submit-ready 1.6s ease infinite}.pad-submit:disabled,.number-button:disabled{opacity:.55;cursor:default;transform:none}.hint-text{margin:0;max-width:40ch;text-align:center;font-size:.82rem;color:var(--text-soft);flex-shrink:0}@keyframes caret-blink{0%,50%{opacity:.55}50.01%,to{opacity:0}}@keyframes digit-tick{0%{transform:scale(1)}40%{transform:scale(1.12)}to{transform:scale(1)}}@keyframes pop{0%{transform:scale(1)}35%{transform:scale(1.035)}to{transform:scale(1)}}@keyframes shake{0%,to{transform:translate(0)}20%{transform:translate(-8px)}40%{transform:translate(7px)}60%{transform:translate(-5px)}80%{transform:translate(3px)}}@keyframes question-enter{0%{opacity:.35;transform:translateY(10px) scale(.98)}to{opacity:1;transform:translateY(0) scale(1)}}@keyframes level-up-glow{0%{transform:scale(1)}30%{transform:scale(1.04)}to{transform:scale(1)}}@keyframes float-up{0%{opacity:0;transform:translate(-50%,12px) scale(.85)}18%{opacity:1;transform:translate(-50%) scale(1)}to{opacity:0;transform:translate(-50%,-48px) scale(1)}}@keyframes stat-pulse{0%{transform:scale(1)}40%{transform:scale(1.06)}to{transform:scale(1)}}@keyframes dot-pop{0%{transform:scale(1)}40%{transform:scale(1.35)}to{transform:scale(1.08)}}@keyframes submit-ready{0%,to{box-shadow:0 1px #ffffff2e inset,0 8px 18px #35556b2e}50%{box-shadow:0 1px #ffffff2e inset,0 8px 22px #35556b47}}@media(max-width:520px){.page-shell{width:100%;padding:max(4px,var(--safe-top)) max(8px,var(--safe-right)) max(4px,var(--safe-bottom)) max(8px,var(--safe-left))}.game-panel{--panel-pad: 12px;border-radius:20px;min-height:calc(100dvh - 8px - var(--safe-top) - var(--safe-bottom));gap:10px}.toolbar{grid-template-columns:1fr auto;grid-template-areas:"title restart" "modes modes";gap:8px}.game-title{grid-area:title;font-size:1.35rem}.restart-button{grid-area:restart;padding:9px 12px;font-size:.9rem}.mode-picker{grid-area:modes;justify-content:stretch;gap:6px}.mode-button{flex:1 1 0;min-width:0;justify-content:center;padding:9px 6px;font-size:.9rem}.stats-row{gap:6px}.stat-card{padding:8px 2px;border-radius:14px;min-width:0}.stat-label{font-size:.62rem;letter-spacing:.06em}.stat-card strong{font-size:1.05rem}.prompt-column{gap:8px}.question-card{min-height:0;border-radius:18px;font-size:clamp(2.1rem,10vw,2.8rem);padding:18px 10px}.level-progress{gap:6px}.pad-column{min-height:0}.number-pad{width:100%;min-height:0;flex:1 1 auto;gap:8px}.number-button{border-radius:16px;font-size:clamp(1.45rem,6vw,1.8rem)}.hint-text{display:none}}@media(max-height:700px)and (max-width:520px){.message{font-size:.88rem;min-height:1.15em}.progress-caption{display:none}.level-progress{gap:4px}.progress-dot{width:11px;height:11px}.question-card{padding:12px 10px;font-size:clamp(1.9rem,9vw,2.4rem)}.stats-row{gap:5px}.stat-card{padding:6px 2px}}@media(min-width:600px)and (max-width:1024px)and (orientation:portrait){.page-shell{width:min(760px,calc(100% - 20px))}.game-panel{--panel-pad: 18px;gap:12px}.question-card{min-height:0;padding:28px 20px;font-size:clamp(3rem,7vw,4rem)}.number-pad{width:min(100%,460px);min-height:0;gap:12px}.number-button{border-radius:20px;font-size:2rem}.mode-button,.restart-button{padding:12px 18px}}@media(min-width:800px)and (orientation:landscape),(min-width:900px)and (min-height:560px){.page-shell{width:min(1120px,calc(100% - 24px));padding-block:max(10px,var(--safe-top)) max(10px,var(--safe-bottom))}.game-panel{--panel-pad: 18px;min-height:calc(100dvh - 20px - var(--safe-top) - var(--safe-bottom))}.play-layout{grid-template-columns:minmax(0,1.15fr) minmax(280px,.85fr);grid-template-rows:minmax(0,1fr);gap:18px;align-items:stretch}.prompt-column{justify-content:center;gap:12px}.pad-column{justify-content:center}.question-stage{flex:0 0 auto}.question-card{min-height:min(200px,34dvh);font-size:clamp(2.8rem,5.5vw,4.6rem)}.number-pad{width:100%;max-width:380px;min-height:0;height:min(420px,calc(100dvh - 160px));flex:0 1 auto;gap:12px}.number-button{border-radius:20px;font-size:clamp(1.7rem,2.8vw,2.15rem)}.hint-text{max-width:28ch}}@media(max-height:480px)and (orientation:landscape){.page-shell{width:100%;padding:4px max(6px,var(--safe-right)) 4px max(6px,var(--safe-left))}.game-panel{--panel-pad: 10px;border-radius:16px;min-height:calc(100dvh - 8px);gap:8px}.toolbar{gap:6px}.game-title{font-size:1.15rem}.mode-button,.restart-button{padding:7px 10px;font-size:.82rem}.play-layout{grid-template-columns:minmax(0,1fr) minmax(200px,.95fr);grid-template-rows:minmax(0,1fr);gap:10px}.stats-row{gap:5px}.stat-card{padding:5px 2px;border-radius:10px}.stat-label{font-size:.55rem}.stat-card strong{font-size:.92rem}.message{font-size:.82rem;min-height:1.1em}.question-stage{flex:1 1 auto}.question-card{min-height:64px;padding:10px 8px;border-radius:14px;font-size:clamp(1.6rem,6vh,2.2rem)}.progress-caption{display:none}.progress-dot{width:10px;height:10px}.number-pad{height:auto;min-height:0;max-height:none;flex:1 1 auto;gap:6px;max-width:none}.number-button{border-radius:12px;font-size:1.3rem}.hint-text{display:none}}@media(min-width:1100px)and (min-height:700px){.question-card{min-height:240px;font-size:4.4rem}.number-pad{max-width:400px;height:440px}}@media(prefers-reduced-motion:reduce){.mode-button,.restart-button,.stat-card,.question-card,.answer-display,.progress-dot,.number-button,.float-chip,.answer-display.is-empty:after{animation:none;transition:none}.answer-display.is-empty:after{opacity:.4}}