:root{--bg: #fff7ed;--card: #ffffff;--text: #3a2f28;--accent: #f97316;--add: #f97316;--sub: #38bdf8;--word: #a78bfa;--correct: #22c55e;--shadow: 0 4px 0 rgba(0, 0, 0, .12)}*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}html,body,#root{height:100%;margin:0}body{font-family:-apple-system,BlinkMacSystemFont,Hiragino Maru Gothic ProN,Hiragino Kaku Gothic ProN,Yu Gothic,Meiryo,sans-serif;background:var(--bg);color:var(--text);overflow-x:hidden;-webkit-text-size-adjust:100%}.app{min-height:100%;display:flex;flex-direction:column}.screen{flex:1;display:flex;flex-direction:column;width:100%;max-width:640px;margin:0 auto;padding:max(16px,env(safe-area-inset-top)) 16px max(16px,env(safe-area-inset-bottom))}button{font-family:inherit;cursor:pointer;border:none;-webkit-user-select:none;user-select:none}.home{justify-content:center;align-items:center;gap:12px;text-align:center}.home-title{font-size:clamp(28px,8vw,44px);margin:0;color:var(--accent);letter-spacing:.02em}.home-title-emoji{display:block;font-size:1.4em}.home-subtitle{margin:0 0 16px;font-size:clamp(15px,4vw,20px);color:#8a7a6d}.option-group{display:flex;flex-direction:column;align-items:center;gap:8px;width:100%}.option-group-label{margin:0;width:100%;max-width:360px;font-size:24px;font-weight:700;color:#b8a998;letter-spacing:.08em;text-align:left}.level-list{display:flex;gap:10px;width:100%;max-width:360px}.level-button{flex:1;min-height:48px;border-radius:16px;font-size:clamp(14px,4vw,17px);font-weight:700;color:var(--text);background:#fff;border:2px solid #ddd;transition:transform .08s ease,background-color .08s ease,border-color .08s ease}.level-button-selected{background:#333;border-color:#333;color:#fff;box-shadow:0 0 0 3px #0000001f}.level-button-selected:before{content:"✓ ";font-weight:900}.level-button:active{transform:translateY(1px)}.mode-list{display:flex;flex-direction:column;gap:18px;width:100%;max-width:360px}.mode-button{position:relative;min-height:76px;border-radius:22px;font-size:clamp(24px,7vw,32px);font-weight:700;color:#fff;box-shadow:var(--shadow);transition:transform .08s ease}.mode-button:active{transform:translateY(2px);box-shadow:0 2px #0000001f}.mode-addition{background:var(--add)}.mode-subtraction{background:var(--sub)}.mode-word{background:var(--word)}.quiz{gap:12px}.quiz-topbar{display:flex;align-items:center;gap:12px}.quit-button{flex-shrink:0;background:#fee2e2;color:#b91c1c;border-radius:14px;padding:10px 14px;font-size:16px;font-weight:700;min-height:44px}.quit-button:active{transform:translateY(1px)}.progress{flex:1}.progress-text{font-size:15px;font-weight:700;color:#8a7a6d;margin-bottom:6px;text-align:right}.progress-bar{height:14px;background:#f1e4d6;border-radius:999px;overflow:hidden}.progress-bar-fill{height:100%;background:var(--accent);border-radius:999px;transition:width .3s ease}.quiz-body{flex:3;display:flex;align-items:center;justify-content:center;padding:12px 4px}.quiz-pad-spacer{flex:1}.equation{font-size:clamp(44px,14vw,72px);font-weight:800;letter-spacing:.03em;text-align:center}.equation-q{color:var(--accent)}.word-problem{font-size:clamp(22px,6vw,30px);line-height:1.9;font-weight:600;text-align:left;margin:0;word-break:keep-all;overflow-wrap:break-word}.number-pad{display:grid;grid-template-columns:repeat(2,1fr);gap:16px;padding-top:4px}.number-button{min-width:96px;min-height:96px;aspect-ratio:1 / 1;border-radius:20px;background:var(--card);color:var(--text);font-size:clamp(32px,11vw,48px);font-weight:800;box-shadow:var(--shadow);transition:transform .06s ease}.number-button:active:not(:disabled){transform:translateY(2px);background:#fff3e6}.number-button:disabled{opacity:.5}.feedback{position:fixed;top:0;right:0;bottom:0;left:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;z-index:50;pointer-events:none;animation:pop-in .2s ease}.feedback-correct{background:#dcfce7d1}.feedback-wrong{background:#f1f5f9e6}.feedback-mark{font-size:clamp(96px,30vw,160px);line-height:1;filter:drop-shadow(0 4px 6px rgba(0,0,0,.12));animation:bounce .4s ease}.feedback-message{font-size:clamp(28px,8vw,40px);font-weight:800;color:var(--text)}.feedback-wrong .feedback-message{color:#475569}@keyframes pop-in{0%{opacity:0}to{opacity:1}}@keyframes bounce{0%{transform:scale(.3)}60%{transform:scale(1.15)}to{transform:scale(1)}}.confetti{position:fixed;top:0;right:0;bottom:0;left:0;overflow:hidden;pointer-events:none;z-index:40}.confetti-piece{position:absolute;top:-12%;border-radius:2px;animation-name:confetti-fall;animation-timing-function:linear;animation-iteration-count:1;animation-fill-mode:forwards}@keyframes confetti-fall{0%{transform:translateY(0) rotate(0);opacity:1}to{transform:translateY(115vh) rotate(var(--rot));opacity:1}}.result{justify-content:center;align-items:center;text-align:center;gap:16px}.result-emoji{font-size:clamp(80px,26vw,140px);line-height:1;animation:bounce .5s ease}.result-headline{font-size:clamp(28px,8vw,40px);font-weight:800;color:var(--accent)}.result-score{font-size:clamp(22px,6vw,30px);font-weight:700}.result-score-num{font-size:1.6em;color:var(--correct)}.result-buttons{display:flex;flex-direction:column;gap:16px;width:100%;max-width:320px;margin-top:12px}.big-button{min-height:68px;border-radius:20px;font-size:clamp(20px,6vw,26px);font-weight:800;color:#fff;box-shadow:var(--shadow);transition:transform .08s ease}.big-button:active{transform:translateY(2px)}.primary-button{background:var(--accent)}.secondary-button{background:#94a3b8}.mode-tetris{background:linear-gradient(135deg,#fb7185,#f0abfc 55%,#a78bfa)}.mode-button-emoji{margin-right:8px}.tetris{gap:8px;padding-top:max(8px,env(safe-area-inset-top));overscroll-behavior:contain}.tetris-topbar{display:flex;align-items:center;gap:10px}.tetris-stats{flex:1;display:flex;justify-content:center;gap:12px}.tetris-stat{display:flex;flex-direction:column;align-items:center;line-height:1.1}.tetris-stat-label{font-size:11px;font-weight:700;color:#b8a998;letter-spacing:.06em}.tetris-stat-value{font-size:clamp(18px,5vw,24px);font-weight:800;color:var(--text);font-variant-numeric:tabular-nums}.tetris-next{display:flex;flex-direction:column;align-items:center;gap:2px;flex-shrink:0}.tetris-next-grid{display:grid;grid-template-columns:repeat(4,11px);grid-template-rows:repeat(4,11px);gap:1px}.tetris-next-cell{border-radius:3px;font-size:0}.tetris-pause-button{align-self:center;background:#fff;border:2px solid #f1e4d6;border-radius:999px;padding:4px 16px;min-height:34px;font-size:14px;font-weight:700;color:#8a7a6d}.tetris-pause-spacer{height:34px;flex-shrink:0}.tetris-stage{flex:1;display:flex;align-items:center;justify-content:center;min-height:0}.tetris-board{--board-w: min(92vw, 36vh, 380px);--board-w: min(92vw, 36dvh, 380px);width:var(--board-w);display:grid;grid-template-columns:repeat(10,1fr);grid-template-rows:repeat(20,1fr);gap:1px;padding:4px;border-radius:14px;background:#fdf2f8;border:3px solid #fbcfe8;box-shadow:inset 0 2px 8px #be78a026;touch-action:none;-webkit-user-select:none;user-select:none}.tetris-cell{aspect-ratio:1 / 1;border-radius:4px;background:#fff;display:flex;align-items:center;justify-content:center;font-size:calc(var(--board-w) / 17);line-height:1}.tetris-cell-I{background:#7dd3fc}.tetris-cell-O{background:#fde047}.tetris-cell-T{background:#f0abfc}.tetris-cell-S{background:#86efac}.tetris-cell-Z{background:#fda4af}.tetris-cell-J{background:#a5b4fc}.tetris-cell-L{background:#fdba74}.tetris-cell-ghost{background:#fff;box-shadow:inset 0 0 0 2px #be78a047}.tetris-cell-flash{background:#fff;animation:tetris-flash .45s ease}@keyframes tetris-flash{0%,to{background:#fff;transform:scale(1)}50%{background:#fef08a;transform:scale(1.12)}}.tetris-hint{display:flex;flex-wrap:wrap;justify-content:center;gap:4px 8px;padding:4px 0 2px}.tetris-hint-item{font-size:12px;font-weight:700;color:#b09a8a;background:#fff;border-radius:999px;padding:4px 10px;white-space:nowrap}.tetris-cheer{position:fixed;top:0;right:0;bottom:0;left:0;display:flex;align-items:center;justify-content:center;pointer-events:none;z-index:45}.tetris-cheer-text{font-size:clamp(32px,10vw,52px);font-weight:800;color:#db2777;text-shadow:0 2px 0 #fff,0 0 14px rgba(255,255,255,.9);animation:tetris-cheer-pop 1.6s ease forwards}@keyframes tetris-cheer-pop{0%{transform:scale(.4);opacity:0}18%{transform:scale(1.15);opacity:1}30%{transform:scale(1);opacity:1}70%{opacity:1}to{transform:scale(1.06);opacity:0}}.tetris-cheer-tetris{font-size:clamp(38px,13vw,68px);background:linear-gradient(90deg,#f87171,#fbbf24,#34d399,#60a5fa,#c084fc);-webkit-background-clip:text;background-clip:text;color:transparent;text-shadow:none}.tetris-cheer-rainbow{display:block;font-size:1.2em}.tetris-overlay{position:fixed;top:0;right:0;bottom:0;left:0;display:flex;align-items:center;justify-content:center;padding:16px;background:#fff7ede6;z-index:60;animation:pop-in .2s ease}.tetris-panel{width:100%;max-width:340px;background:#fff;border-radius:26px;padding:22px 20px;text-align:center;box-shadow:0 10px 30px #be78a040}.tetris-panel-emoji{font-size:clamp(56px,18vw,84px);line-height:1;animation:bounce .5s ease}.tetris-panel-title{font-size:clamp(22px,6vw,30px);font-weight:800;color:var(--accent);margin-top:4px}.tetris-score-list{margin:16px 0 0;display:flex;flex-direction:column;gap:6px}.tetris-score-row{display:flex;align-items:baseline;justify-content:space-between;font-size:17px;font-weight:700}.tetris-score-row dt{color:#8a7a6d}.tetris-score-row dd{margin:0;font-variant-numeric:tabular-nums}.tetris-score-main{font-size:30px;font-weight:800;color:var(--correct)}.tetris-score-best{border-top:2px dashed #f1e4d6;padding-top:6px;margin-top:4px;color:#db2777}.tetris-score-best dt,.tetris-score-best dd{color:#db2777}@media(prefers-reduced-motion:reduce){.confetti,.feedback-mark,.result-emoji,.feedback,.tetris-cell-flash,.tetris-cheer-text,.tetris-panel-emoji,.tetris-overlay{animation:none!important}}