:root{--primary:#6366f1;--primary-dark:#4f46e5;--secondary:#ec4899;--accent:#8b5cf6;--background:#0f172a;--surface:#1e293b;--surface-glass:rgba(30, 41, 59, 0.7);--text:#f8fafc;--text-muted:#94a3b8;--success:#10b981;--error:#ef4444;--border:#334155;--radius:16px;--font-main:'Zen Kaku Gothic New',sans-serif;--font-en:'Outfit',sans-serif;--font-fun:'Kaisei Decol',serif}*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}body{margin:0;font-family:var(--font-en),var(--font-main);background:var(--background);color:var(--text);min-height:100vh;display:flex;justify-content:center;background-image:radial-gradient(at 0 0,rgba(99,102,241,.3) 0,transparent 50%),radial-gradient(at 100% 0,rgba(236,72,153,.3) 0,transparent 50%),radial-gradient(at 100% 100%,rgba(139,92,246,.3) 0,transparent 50%);background-attachment:fixed}.app-container{width:100%;max-width:480px;min-height:100vh;background:var(--surface-glass);backdrop-filter:blur(20px);box-shadow:0 0 40px rgba(0,0,0,.5);display:flex;flex-direction:column;position:relative;overflow-x:hidden}.app-header{padding:2rem 1.5rem;text-align:center}.app-header h1{font-size:3rem;margin:0;font-weight:700;background:linear-gradient(135deg,#fff 30%,var(--text-muted) 100%);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;letter-spacing:-.02em;line-height:1.2}.jp-title{font-family:var(--font-fun);font-size:1rem;color:#7ce675;margin:0 0 -.5rem 0;text-shadow:none;letter-spacing:.1em;opacity:.9}.app-header p{margin:.5rem 0 0;color:var(--secondary);font-size:.9rem;font-weight:500;letter-spacing:.05em;text-transform:uppercase}.screen{display:none;flex:1;flex-direction:column;padding:1.5rem;animation:fadeIn .3s ease}.screen.active{display:flex}@keyframes fadeIn{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.btn{display:block;width:100%;padding:1rem;border:none;border-radius:var(--radius);font-family:inherit;font-weight:700;font-size:1rem;cursor:pointer;transition:all .2s cubic-bezier(.4, 0, .2, 1);margin-bottom:.75rem;text-align:center;text-decoration:none;position:relative;overflow:hidden}.btn-audio{background:0 0;border:1px solid var(--secondary);color:var(--secondary);border-radius:50%;width:36px;height:36px;display:inline-flex;align-items:center;justify-content:center;cursor:pointer;margin-left:10px;vertical-align:middle;transition:all .2s}.btn-audio:hover{background:rgba(236,72,153,.1);transform:scale(1.1)}.btn:active{transform:scale(.98)}.btn-primary{background:linear-gradient(135deg,var(--primary) 0,var(--primary-dark) 100%);color:#fff;box-shadow:0 4px 12px rgba(99,102,241,.4)}.btn-primary:hover{box-shadow:0 6px 16px rgba(99,102,241,.5);background:linear-gradient(135deg,#818cf8 0,#6366f1 100%)}.btn-secondary{background:var(--surface);border:1px solid var(--border);color:var(--text)}.btn-outline{background:0 0;border:1px solid var(--border);color:var(--text-muted)}.btn-icon{background:0 0;border:none;color:var(--text-muted);font-size:1.5rem;cursor:pointer;padding:.5rem;border-radius:50%;transition:background .2s}.btn-icon:hover{background:rgba(255,255,255,.1);color:var(--text)}.menu-controls{background:rgba(0,0,0,.2);padding:1.5rem;border-radius:var(--radius);margin-bottom:2rem;border:1px solid rgba(255,255,255,.05)}.control-group h3{margin:0 0 .8rem 0;font-size:.9rem;color:var(--text-muted);font-weight:500}.control-group+.control-group{margin-top:1.5rem}.level-select{display:flex;gap:1rem;flex-wrap:wrap}.checkbox-label{display:flex;align-items:center;gap:.5rem;cursor:pointer}input[type=checkbox]{accent-color:var(--primary);width:1.2rem;height:1.2rem}.separator{height:1px;background:var(--border);margin:1.5rem 0;opacity:.5}.quiz-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:2rem}#quiz-progress{font-family:var(--font-en);font-weight:700;color:var(--text-muted)}.question-box{text-align:center;margin-bottom:3rem}.question-text{font-size:2rem;font-weight:700;margin:0}.choices-grid{display:grid;grid-template-columns:1fr;gap:1rem}.choice-btn{background:var(--surface);border:1px solid var(--border);color:var(--text);padding:1.2rem;border-radius:12px;font-size:1.1rem;cursor:pointer;transition:all .2s;text-align:left}.choice-btn:hover{background:rgba(255,255,255,.05);border-color:var(--text-muted)}.choice-btn.correct{background:rgba(16,185,129,.2);border-color:var(--success);color:var(--success)}.choice-btn.wrong{background:rgba(239,68,68,.2);border-color:var(--error);color:var(--error)}.next-btn{margin-top:2rem}.hidden{display:none!important}.card-container{perspective:1000px;width:100%;height:300px;margin-bottom:2rem}.flashcard{position:relative;width:100%;height:100%;text-align:center;transition:transform .6s;transform-style:preserve-3d;cursor:pointer}.flashcard.flipped{transform:rotateY(180deg)}.card-back,.card-front{position:absolute;width:100%;height:100%;backface-visibility:hidden;border-radius:var(--radius);display:flex;flex-direction:column;justify-content:center;align-items:center;padding:2rem;box-shadow:0 4px 20px rgba(0,0,0,.3);border:1px solid var(--border);background:#fff;background:var(--surface)}.card-back{transform:rotateY(180deg);background:linear-gradient(135deg,var(--surface) 0,#2d3748 100%);border-color:var(--primary)}.card-text{font-size:2rem;font-weight:700}.tap-instruction{position:absolute;bottom:1rem;font-size:.8rem;color:var(--text-muted);opacity:.6}.judgment-buttons{display:flex;gap:1.5rem;justify-content:center}.judge-btn{width:80px;height:80px;border-radius:50%;border:none;font-size:2rem;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:transform .2s}.judge-btn:active{transform:scale(.9)}.judge-btn.correct{background:var(--success);color:#fff;box-shadow:0 4px 12px rgba(16,185,129,.4)}.judge-btn.incorrect{background:var(--error);color:#fff;box-shadow:0 4px 12px rgba(239,68,68,.4)}.hint-controls{margin-bottom:1rem;text-align:center;font-size:.9rem;color:var(--text-muted);display:flex;justify-content:center}.btn-hint{background:0 0;border:1px solid var(--secondary);color:var(--secondary);padding:.5rem 1rem;border-radius:20px;font-size:.9rem;margin-top:1rem;cursor:pointer}.hint-text{margin-top:1rem;color:var(--secondary);font-weight:500}.cool-hint{display:flex;justify-content:center;gap:.5rem;margin-top:1.5rem}.hint-char{display:inline-flex;align-items:center;justify-content:center;width:40px;height:50px;background:rgba(255,255,255,.1);border:1px solid var(--secondary);border-radius:8px;font-size:1.5rem;font-weight:700;color:var(--secondary);box-shadow:0 4px 10px rgba(0,0,0,.2)}.hint-dot{display:inline-flex;align-items:center;justify-content:center;width:40px;height:50px;background:rgba(255,255,255,.05);border-radius:8px;color:var(--text-muted)}.hint-dot::after{content:'';width:8px;height:8px;background:var(--text-muted);border-radius:50%}.score-display{display:flex;justify-content:center;margin:2rem 0}.score-circle{width:150px;height:150px;border-radius:50%;border:4px solid var(--primary);display:flex;flex-direction:column;justify-content:center;align-items:center;box-shadow:0 0 30px rgba(99,102,241,.3)}#score-number{font-size:4rem;font-weight:700;line-height:1}.score-label{font-size:.9rem;color:var(--text-muted);margin-top:.2rem}.result-list{margin-bottom:2rem;overflow-x:auto}.result-table{width:100%;border-collapse:collapse;font-size:.9rem}.result-table td,.result-table th{padding:.8rem;text-align:left;border-bottom:1px solid var(--border)}.result-table th{color:var(--text-muted);font-weight:500}.status-icon.correct{color:var(--success)}.status-icon.wrong{color:var(--error)}.screen-header{display:flex;align-items:center;gap:1rem;margin-bottom:1rem}.screen-header h2{font-size:1.2rem;margin:0}.stats-tabs{display:flex;background:rgba(0,0,0,.2);border-radius:12px;padding:4px;margin-bottom:1rem}.tab-btn{flex:1;background:0 0;border:none;color:var(--text-muted);padding:.8rem;border-radius:8px;cursor:pointer;font-weight:700;transition:all .2s}.tab-btn.active{background:var(--surface);color:var(--text);box-shadow:0 2px 4px rgba(0,0,0,.2)}.stats-list{display:flex;flex-direction:column;gap:.8rem}.stat-item{background:rgba(255,255,255,.03);padding:1rem;border-radius:12px;display:flex;justify-content:space-between;align-items:center}.stat-rank{font-size:1.2rem;font-weight:700;color:var(--primary);width:40px}.stat-word{flex:1}.stat-main{font-weight:700;display:block}.stat-sub{font-size:.8rem;color:var(--text-muted)}.stat-rate{text-align:right}.rate-val{font-weight:700;color:var(--secondary)}.rate-count{font-size:.7rem;color:var(--text-muted);display:block}.slide-out-left{animation:slideOutLeft .3s forwards cubic-bezier(.4,0,.2,1)}.slide-in-right{animation:slideInRight .3s forwards cubic-bezier(.4,0,.2,1)}@keyframes slideOutLeft{from{opacity:1;transform:translateX(0)}to{opacity:0;transform:translateX(-50px)}}@keyframes slideInRight{from{opacity:0;transform:translateX(50px)}to{opacity:1;transform:translateX(0)}}.judgment-container{display:flex;flex-direction:column;align-items:center;gap:1rem;margin-top:1rem}.judgment-instruction{margin:0;font-size:.85rem;color:var(--text-muted);font-weight:500}