.nkc-container{--nkc-bg:#ffffff;--nkc-panel:#f9f9fb;--nkc-border:#e2e4e8;--nkc-text:#333333;--nkc-mute:#777777;--nkc-accent:#e60033;--nkc-accent-hover:#cc002d;--nkc-gold:#e8c874;--nkc-correct:#2ea043;--nkc-wrong:#f85149;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;color:var(--nkc-text);background:var(--nkc-bg);border-radius:12px;padding:32px;max-width:700px;margin:0 auto;box-shadow:0 4px 20px rgb(0 0 0 / .06);border:1px solid var(--nkc-border);position:relative;overflow:hidden}.nkc-loader{text-align:center;color:var(--nkc-mute);font-size:1.1rem;padding:40px 0;animation:nkc-pulse 1.5s infinite alternate}.nkc-hud{display:flex;justify-content:space-between;align-items:center;margin-bottom:24px;border-bottom:1px solid var(--nkc-border);padding-bottom:16px}.nkc-stat{display:flex;flex-direction:column;align-items:center}.nkc-stat span{font-size:.8rem;text-transform:uppercase;letter-spacing:.05em;color:var(--nkc-mute)}.nkc-stat strong{font-size:1.5rem;font-weight:700}.nkc-timer strong{color:var(--nkc-accent)}.nkc-combo strong{color:var(--nkc-gold);text-shadow:1px 1px 0 rgb(0 0 0 / .1);transition:transform 0.2s cubic-bezier(.175,.885,.32,1.275)}.nkc-combo.bump strong{transform:scale(1.3)}.nkc-question-area{text-align:center;margin-bottom:32px}.nkc-prompt{font-size:1.5rem;font-weight:600;margin-bottom:8px;line-height:1.4;color:var(--nkc-text)}.nkc-options{display:grid;grid-template-columns:1fr 1fr;gap:16px}.nkc-btn{background:#fff;border:2px solid var(--nkc-border);color:var(--nkc-text);padding:18px 24px;border-radius:12px;font-size:1.1rem;font-weight:500;cursor:pointer;transition:all 0.2s ease;box-shadow:0 2px 5px rgb(0 0 0 / .02)}.nkc-btn:hover{border-color:var(--nkc-accent);transform:translateY(-2px);box-shadow:0 4px 10px rgb(230 0 51 / .1)}.nkc-btn:active{transform:translateY(1px)}.nkc-btn.correct{background:rgb(46 160 67 / .1);border-color:var(--nkc-correct);color:var(--nkc-correct);font-weight:700}.nkc-btn.wrong{background:rgb(248 81 73 / .1);border-color:var(--nkc-wrong);color:var(--nkc-wrong);animation:nkc-shake 0.4s}.nkc-end{text-align:center;padding:20px 0}.nkc-end h2{font-size:2rem;margin-bottom:12px;color:var(--nkc-text)}.nkc-end-stats{display:flex;justify-content:center;gap:32px;margin:24px 0}.nkc-end-stats .nkc-stat strong{font-size:2.2rem}@keyframes nkc-pulse{from{opacity:.6}to{opacity:1}}@keyframes nkc-shake{0%,100%{transform:translateX(0)}20%,60%{transform:translateX(-5px)}40%,80%{transform:translateX(5px)}}.nkc-screen{display:none;animation:nkc-fade-in 0.3s}.nkc-screen.nkc-screen-on{display:block}@keyframes nkc-fade-in{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.nkc-actions{display:flex;justify-content:center;flex-wrap:wrap;gap:12px;margin-top:24px}.nkc-btn-primary,.nkc-btn-secondary,.nkc-btn-outline{border:none;padding:12px 24px;border-radius:8px;font-size:1rem;font-weight:600;cursor:pointer;transition:all 0.2s}.nkc-btn-primary{background:var(--nkc-accent);color:#fff}.nkc-btn-primary:hover{background:var(--nkc-accent-hover);transform:translateY(-1px);box-shadow:0 4px 12px rgb(230 0 51 / .2)}.nkc-btn-secondary{background:var(--nkc-panel);color:var(--nkc-text);border:1px solid var(--nkc-border)}.nkc-btn-secondary:hover{background:#eef0f3}.nkc-btn-outline{background:#fff0;color:var(--nkc-mute);border:1px solid var(--nkc-border)}.nkc-btn-outline:hover{color:var(--nkc-text);border-color:var(--nkc-text)}.nkc-btn-back{background:none;border:none;color:var(--nkc-mute);cursor:pointer;font-size:1rem;padding:0;margin-bottom:16px;transition:color 0.2s}.nkc-btn-back:hover{color:var(--nkc-accent)}.nkc-hero{text-align:center}.nkc-hero h2{font-size:2.5rem;margin-bottom:16px;color:var(--nkc-text)}.nkc-hero p{color:var(--nkc-mute);margin-bottom:32px;line-height:1.6;max-width:450px;margin-left:auto;margin-right:auto}.nkc-stats-strip{display:flex;justify-content:center;gap:40px;margin-bottom:40px;background:var(--nkc-panel);border:1px solid var(--nkc-border);padding:20px;border-radius:12px}.nkc-stats-strip div{display:flex;flex-direction:column}.nkc-stats-strip .v{font-size:1.8rem;font-weight:800;color:var(--nkc-accent)}.nkc-stats-strip .l{font-size:.8rem;text-transform:uppercase;color:var(--nkc-mute);letter-spacing:.05em;margin-top:4px}.nkc-dash-header{margin-bottom:24px}.nkc-dash-header h3{font-size:1.8rem;margin:0;color:var(--nkc-text)}.nkc-dash-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px}.nkc-card{background:var(--nkc-panel);border:1px solid var(--nkc-border);padding:24px;border-radius:12px}.nkc-card h4{margin:0 0 16px 0;font-size:1.2rem;display:flex;justify-content:space-between;align-items:center}.nkc-card h4 em{font-style:normal;color:var(--nkc-mute);font-size:.9rem}.nkc-small-note{font-size:.85rem;color:var(--nkc-mute);margin-top:-10px;margin-bottom:16px}.nkc-heat{display:grid;grid-template-columns:repeat(auto-fill,minmax(12px,1fr));gap:4px;min-height:80px}.nkc-heat i{display:block;padding-bottom:100%;border-radius:2px;background:#e2e4e8}.nkc-heat i[data-val="1"]{background:rgb(230 0 51 / .3)}.nkc-heat i[data-val="2"]{background:rgb(230 0 51 / .6)}.nkc-heat i[data-val="3"]{background:rgb(230 0 51)}.nkc-learned-list{max-height:200px;overflow-y:auto;padding-right:8px}.nkc-learned-item{display:flex;justify-content:space-between;padding:10px 0;border-bottom:1px solid var(--nkc-border);font-size:.95rem}.nkc-learned-item:last-child{border-bottom:none}.nkc-learned-item .nkc-srs-box{color:var(--nkc-correct);font-size:.8rem;font-weight:700;background:rgb(46 160 67 / .1);padding:2px 8px;border-radius:10px}.nkc-empty-note{color:var(--nkc-mute);font-style:italic;font-size:.9rem}.nkc-review-area{margin-top:24px;background:var(--nkc-panel);border:1px solid var(--nkc-border);border-radius:12px;padding:20px;text-align:left}.nkc-review-area h4{margin:0 0 16px 0;color:var(--nkc-wrong)}.nkc-review-list{max-height:200px;overflow-y:auto}.nkc-review-item{margin-bottom:12px;padding-bottom:12px;border-bottom:1px solid var(--nkc-border)}.nkc-review-item:last-child{margin-bottom:0;padding-bottom:0;border-bottom:none}.nkc-review-q{font-weight:600;color:var(--nkc-text);margin-bottom:4px}.nkc-review-a{font-size:.9rem}.nkc-review-a strong{color:var(--nkc-correct)}.nkc-review-w{color:var(--nkc-wrong);text-decoration:line-through;margin-right:8px}@media (max-width:600px){.nkc-options{grid-template-columns:1fr}.nkc-container{padding:20px}.nkc-dash-grid{grid-template-columns:1fr}.nkc-actions{flex-direction:column}}