:root{--primary:#ff4b4b;--bg-color:#0f172a;--text-main:#f8fafc;--text-muted:#94a3b8;--glass-bg:#1e293bb3;--glass-border:#ffffff1a;--success:#10b981;--danger:#ef4444;--shadow:#0000005e;--radial-a:#ff4b4b1a;--radial-b:#3b82f61a;--input-bg:#0003;--btn-secondary-bg:#ffffff1a;--btn-secondary-hover:#fff3;--btn-secondary-text:#f8fafc;--surface-subtle:#ffffff0a;--surface-hover:#ffffff14;--surface-active:#ff4b4b26;--character-glow:#fff3;--modal-overlay:#000c}[data-theme=light]{--bg-color:#f0f4f8;--text-main:#0f172a;--text-muted:#64748b;--glass-bg:#fff;--glass-border:#00000014;--shadow:#0000001a;--radial-a:#ff4b4b0f;--radial-b:#3b82f60f;--input-bg:#0000000d;--btn-secondary-bg:#00000012;--btn-secondary-hover:#0000001f;--btn-secondary-text:#0f172a;--surface-subtle:#00000008;--surface-hover:#0000000f;--surface-active:#ff4b4b1f;--character-glow:#00000014;--modal-overlay:#0f172a59}body{background-color:var(--bg-color);color:var(--text-main);background-image:radial-gradient(circle at top right, var(--radial-a), transparent 400px), radial-gradient(circle at bottom left, var(--radial-b), transparent 400px);flex-direction:column;min-height:100vh;margin:0;font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;transition:background-color .3s,color .3s;display:flex}.app-container{box-sizing:border-box;width:100%;max-width:1000px;margin:0 auto;padding:2rem}.header{text-align:center;margin-bottom:3rem}.header h1{background:linear-gradient(90deg,#ff4b4b,#fbbf24);-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text;margin:0;font-size:3rem}.header p{color:var(--text-muted);font-size:1.2rem}.glass-panel{background:var(--glass-bg);-webkit-backdrop-filter:blur(12px);border:1px solid var(--glass-border);box-shadow:0 8px 32px 0 var(--shadow);border-radius:20px;padding:2rem}.btn{background:var(--primary);color:#fff;cursor:pointer;border:none;border-radius:12px;padding:12px 24px;font-size:1.1rem;font-weight:600;transition:all .2s;box-shadow:0 4px 15px #ff4b4b66}.btn:hover{transform:scale(1.05);box-shadow:0 6px 20px #ff4b4b99}.btn-secondary{background:var(--btn-secondary-bg);color:var(--btn-secondary-text);box-shadow:none;border:1px solid var(--glass-border)}.btn-secondary:hover{background:var(--btn-secondary-hover);box-shadow:0 4px 15px #0003}.quiz-card{text-align:center}.character-display{text-shadow:0 0 20px var(--character-glow);margin:2rem 0;font-size:8rem;font-weight:700}.input-group{justify-content:center;gap:10px;margin-top:2rem;display:flex}.quiz-input{background:var(--input-bg);border:2px solid var(--glass-border);color:var(--text-main);text-align:center;border-radius:12px;outline:none;width:200px;padding:12px 20px;font-size:1.5rem;transition:all .3s}.quiz-input:focus{border-color:var(--primary);box-shadow:0 0 15px #ff4b4b4d}.feedback{height:1.5rem;margin-top:1.5rem;font-size:1.2rem;font-weight:700}.feedback.correct{color:var(--success)}.feedback.incorrect{color:var(--danger)}.grid-selection{grid-template-columns:repeat(auto-fit,minmax(120px,1px));justify-content:center;gap:15px;display:grid}.selection-card{cursor:pointer;text-align:center;background:var(--surface-subtle);border:1px solid var(--glass-border);border-radius:15px;padding:15px;transition:all .2s}.selection-card:hover{background:var(--surface-hover)}.selection-card.active{background:var(--surface-active);border-color:var(--primary)}.dashboard-sections{flex-direction:column;gap:20px;display:flex}.kana-table{flex-direction:column;gap:10px;display:flex}.kana-row{background:var(--surface-subtle);border:1px solid var(--glass-border);cursor:pointer;border-radius:12px;align-items:center;padding:12px 20px;transition:all .2s;display:flex}.kana-row:hover{background:var(--surface-hover)}.kana-row.active{background:var(--surface-active);border-color:var(--primary)}.kana-group-label{width:100px;color:var(--primary);text-transform:uppercase;letter-spacing:1px;font-size:.9rem;font-weight:700}.kana-cells{grid-template-columns:repeat(5,50px);gap:15px;font-size:1.5rem;display:grid}.kana-cell{flex-direction:column;justify-content:center;align-items:center;width:50px;display:flex}.tables-container{flex-flow:wrap;justify-content:center;align-items:flex-start;gap:30px;display:flex}.table-column{flex:1;min-width:340px}.toggle-switch{width:48px;height:24px;display:inline-block;position:relative}.toggle-switch input{opacity:0;width:0;height:0}.slider{cursor:pointer;border:1px solid var(--glass-border);background-color:#ffffff1a;border-radius:24px;transition:all .3s;position:absolute;inset:0}.slider:before{content:"";background-color:#fff;border-radius:50%;width:16px;height:16px;transition:all .3s;position:absolute;bottom:3px;left:3px;box-shadow:0 2px 4px #0000004d}input:checked+.slider{background-color:var(--primary);border-color:var(--primary);box-shadow:0 0 10px #ff4b4b66}input:focus+.slider{box-shadow:0 0 10px #ff4b4b66}input:checked+.slider:before{transform:translate(24px)}@keyframes fadeIn{0%{opacity:0;transform:translateY(6px)}to{opacity:1;transform:translateY(0)}}