:root{--orange: #FF6B35;--blue: #4ECDC4;--yellow: #FFE66D;--cream: #FFF8E7;--green: #51CF66;--pink: #FF6B6B;--purple: #845EF7;--brown: #8B6914;--light-brown: #D4A574;--text: #2D3436;--shadow: rgba(0,0,0,.08);--radius: 24px;--btn-min: 75px}*{margin:0;padding:0;box-sizing:border-box;-webkit-tap-highlight-color:transparent}html,body,#root{height:100%;overflow:hidden;touch-action:manipulation;user-select:none;-webkit-user-select:none}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Hiragino Kaku Gothic ProN,Noto Sans JP,sans-serif;background:var(--cream);color:var(--text)}.app{height:100%;display:flex;flex-direction:column}.page{flex:1;display:flex;flex-direction:column;padding:20px;overflow-y:auto;-webkit-overflow-scrolling:touch;position:relative}.page-center{justify-content:center;align-items:center}.header{display:flex;align-items:center;justify-content:space-between;padding:12px 20px;background:#fff;border-bottom:3px solid var(--orange);box-shadow:0 2px 8px var(--shadow);position:relative;z-index:10}.header-title{font-size:20px;font-weight:800;color:var(--orange);letter-spacing:1px}.header-back{width:44px;height:44px;border:none;background:var(--cream);border-radius:50%;font-size:24px;display:flex;align-items:center;justify-content:center;cursor:pointer;transition:transform .15s}.header-back:active{transform:scale(.9)}.big-btn{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:6px;min-height:var(--btn-min);min-width:var(--btn-min);border:4px solid transparent;border-radius:var(--radius);font-size:28px;font-weight:700;cursor:pointer;transition:all .15s;position:relative;overflow:hidden;padding:16px}.big-btn:active{transform:scale(.94)}.big-btn .emoji{font-size:48px;line-height:1}.big-btn .label{font-size:16px;color:var(--text);white-space:nowrap}.category-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px;width:100%;max-width:500px;margin:0 auto}.game-select{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;margin:16px 0}.game-btn{padding:10px 20px;border:3px solid var(--blue);border-radius:50px;background:#fff;font-size:18px;font-weight:700;cursor:pointer;transition:all .15s;color:var(--text)}.game-btn.active{background:var(--blue);color:#fff}.game-btn:active{transform:scale(.94)}.flashcard-container{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:20px;padding:20px}.flashcard{width:280px;height:320px;perspective:1000px;cursor:pointer}.flashcard-inner{position:relative;width:100%;height:100%;transition:transform .4s;transform-style:preserve-3d}.flashcard.flipped .flashcard-inner{transform:rotateY(180deg)}.flashcard-front,.flashcard-back{position:absolute;width:100%;height:100%;backface-visibility:hidden;border-radius:var(--radius);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:12px;box-shadow:0 8px 24px var(--shadow)}.flashcard-front{background:linear-gradient(135deg,var(--orange),#FF8F65);color:#fff;font-size:48px}.flashcard-back{background:#fff;transform:rotateY(180deg);border:4px solid var(--orange)}.flashcard-back .hiragana{font-size:56px;font-weight:700;color:var(--text)}.flashcard-back .emoji-big{font-size:80px}.flashcard-nav{display:flex;gap:24px;align-items:center}.nav-arrow{width:56px;height:56px;border:none;border-radius:50%;background:#fff;font-size:28px;box-shadow:0 4px 12px var(--shadow);cursor:pointer;transition:all .15s}.nav-arrow:active{transform:scale(.88)}.nav-counter{font-size:18px;font-weight:700;color:#999;min-width:60px;text-align:center}.quiz-area{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:24px}.quiz-prompt{font-size:36px;font-weight:700;color:var(--orange);text-align:center;padding:20px;background:#fff;border-radius:var(--radius);box-shadow:0 4px 16px var(--shadow);min-width:200px;cursor:pointer;transition:transform .15s}.quiz-prompt:active{transform:scale(.96)}.quiz-choices{display:grid;grid-template-columns:repeat(2,1fr);gap:16px;max-width:400px;width:100%}.choice-btn{min-height:100px;border:4px solid #ddd;border-radius:var(--radius);background:#fff;font-size:64px;cursor:pointer;transition:all .15s;display:flex;align-items:center;justify-content:center}.choice-btn:active{transform:scale(.94)}.choice-btn.correct{border-color:var(--green);background:#e8f9ed;animation:pop .3s}.choice-btn.wrong{border-color:var(--pink);background:#ffe8e8;animation:shake .3s}.memory-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;max-width:400px;width:100%;padding:10px}.memory-card{aspect-ratio:1;border:3px solid #ddd;border-radius:16px;background:linear-gradient(135deg,var(--blue),#6CD4CE);cursor:pointer;transition:all .2s;display:flex;align-items:center;justify-content:center;font-size:40px}.memory-card:active{transform:scale(.94)}.memory-card.revealed,.memory-card.matched{background:#fff;border-color:var(--green);transform:rotateY(0)}.memory-card.matched{opacity:.6;pointer-events:none}.memory-card.hidden{color:transparent}.balloon-area{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:20px;position:relative;overflow:hidden}.balloon-target{font-size:28px;font-weight:700;padding:12px 24px;background:#fff;border-radius:50px;box-shadow:0 4px 12px var(--shadow);position:relative;z-index:2}.balloon-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px;position:relative;z-index:2}.balloon{width:120px;height:150px;cursor:pointer;transition:all .15s;display:flex;flex-direction:column;align-items:center;justify-content:center;position:relative}.balloon:active{transform:scale(.9)}.balloon-body{width:100px;height:120px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:48px;box-shadow:inset -8px -8px 20px #0000001a;animation:float 2s ease-in-out infinite}.balloon-string{width:2px;height:30px;background:#999}.balloon.pop{animation:popAnim .3s forwards}.stamp-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px;max-width:400px;width:100%;padding:20px 0}.stamp-item{display:flex;flex-direction:column;align-items:center;gap:8px;padding:20px;background:#fff;border-radius:var(--radius);box-shadow:0 4px 12px var(--shadow)}.stamp-icon{font-size:48px}.stamp-badge{width:60px;height:60px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:32px;border:3px solid #ddd;background:#f5f5f5}.stamp-badge.earned{border-color:var(--orange);background:linear-gradient(135deg,var(--orange),#FF8F65);color:#fff;animation:stampIn .4s}.stamp-label{font-size:14px;font-weight:700;color:#999;text-align:center}.stamp-label.earned{color:var(--text)}.panel-section{width:100%;max-width:500px;margin:0 auto 20px}.panel-section h2{font-size:18px;color:var(--orange);margin-bottom:10px;padding-bottom:6px;border-bottom:2px solid var(--cream)}.progress-bar{height:12px;background:#eee;border-radius:6px;overflow:hidden;margin:8px 0}.progress-fill{height:100%;background:linear-gradient(90deg,var(--orange),#FF8F65);border-radius:6px;transition:width .3s}.progress-row{display:flex;justify-content:space-between;align-items:center;padding:8px 0;border-bottom:1px solid #f0f0f0}.progress-row .name{font-size:14px;font-weight:600}.progress-row .score{font-size:13px;color:#999}.progress-row .weak{color:var(--pink);font-size:12px}@keyframes pop{0%{transform:scale(1)}50%{transform:scale(1.1)}to{transform:scale(1)}}@keyframes shake{0%,to{transform:translate(0)}25%{transform:translate(-8px)}75%{transform:translate(8px)}}@keyframes float{0%,to{transform:translateY(0)}50%{transform:translateY(-8px)}}@keyframes popAnim{0%{transform:scale(1);opacity:1}50%{transform:scale(1.3);opacity:.5}to{transform:scale(0);opacity:0}}@keyframes stampIn{0%{transform:scale(0) rotate(-30deg)}60%{transform:scale(1.2) rotate(5deg)}to{transform:scale(1) rotate(0)}}@keyframes bounceIn{0%{transform:scale(0)}50%{transform:scale(1.15)}70%{transform:scale(.95)}to{transform:scale(1)}}@keyframes slideUp{0%{transform:translateY(30px);opacity:0}to{transform:translateY(0);opacity:1}}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes wiggle{0%,to{transform:rotate(0)}25%{transform:rotate(-8deg)}75%{transform:rotate(8deg)}}.starburst-container{position:fixed;top:0;left:0;width:100%;height:100%;pointer-events:none;z-index:999}.star-particle{position:absolute;font-size:24px;animation:starFall 1.2s ease-out forwards}@keyframes starFall{0%{transform:translateY(0) rotate(0) scale(1);opacity:1}to{transform:translateY(300px) rotate(720deg) scale(0);opacity:0}}.confetti-piece{position:absolute;width:10px;height:10px;border-radius:2px;animation:confettiFall 1.5s ease-out forwards}@keyframes confettiFall{0%{transform:translateY(0) rotate(0);opacity:1}to{transform:translateY(400px) rotate(720deg);opacity:0}}.top-bar{display:flex;align-items:center;justify-content:space-between;padding:8px 0}.top-bar .counter{font-size:16px;font-weight:700;color:var(--orange)}@media (min-width: 600px){.flashcard{width:340px;height:380px}.flashcard-back .hiragana{font-size:64px}.flashcard-back .emoji-big{font-size:100px}.memory-grid{gap:14px}.balloon-body{width:120px;height:140px}.balloon{width:140px;height:170px}.quiz-choices{grid-template-columns:repeat(3,1fr)}}.spacer{flex:1}.text-center{text-align:center}.mt-8{margin-top:8px}.mt-16{margin-top:16px}.mt-24{margin-top:24px}.subtitle{font-size:16px;color:#999;margin-bottom:16px;text-align:center}.empty-state{font-size:18px;color:#ccc;text-align:center;padding:40px}.score-display{font-size:20px;font-weight:700;color:var(--orange);padding:8px 16px;background:#fff;border-radius:50px;box-shadow:0 2px 8px var(--shadow)}