.mkfc{--mkfc-ink:#1d1b19;--mkfc-muted:#6b645c;--mkfc-paper:#fffdf8;--mkfc-back:#1f3a4d;--mkfc-back-ink:#f6f1e7;--mkfc-accent:#c8553d;--mkfc-line:#e4ddd0;max-width:760px;margin:1.5rem auto;font-family:Georgia,"Times New Roman",serif;color:var(--mkfc-ink)}.mkfc *{box-sizing:border-box}.mkfc__head{display:flex;justify-content:space-between;align-items:baseline;gap:1rem;margin-bottom:.75rem;flex-wrap:wrap}.mkfc__title{font-size:1.25rem;margin:0;font-weight:600}.mkfc__count{font-family:system-ui,sans-serif;font-size:.9rem;color:var(--mkfc-muted)}.mkfc__levels{display:flex;flex-wrap:wrap;align-items:center;gap:.4rem;margin-bottom:1rem;font-family:system-ui,sans-serif}.mkfc__levels-label{font-size:.9rem;color:var(--mkfc-muted);margin-right:.25rem}.mkfc__level{font:inherit;font-size:.92rem;padding:.45rem .9rem;border-radius:999px;border:1px solid var(--mkfc-line);background:#fff;color:var(--mkfc-ink);cursor:pointer}.mkfc__level:hover{border-color:var(--mkfc-ink)}.mkfc__level.is-active{background:var(--mkfc-back);border-color:var(--mkfc-back);color:var(--mkfc-back-ink)}.mkfc__level:focus-visible{outline:3px solid var(--mkfc-accent);outline-offset:2px}.mkfc__progress{height:4px;background:var(--mkfc-line);border-radius:2px;margin-bottom:1rem;overflow:hidden}.mkfc__bar{height:100%;width:0;background:var(--mkfc-accent);transition:width .3s ease}.mkfc__stage{perspective:1400px}.mkfc__card{position:relative;width:100%;min-height:320px;cursor:pointer;transform-style:preserve-3d;transition:transform .55s cubic-bezier(.2,.7,.2,1);border:0;padding:0;background:0 0;font:inherit;color:inherit;display:block}.mkfc__card.is-flipped{transform:rotateY(180deg)}.mkfc__face{position:absolute;inset:0;border-radius:14px;backface-visibility:hidden;-webkit-backface-visibility:hidden;display:flex;flex-direction:column;justify-content:center;align-items:center;text-align:center;padding:2.5rem 2rem;box-shadow:0 1px 2px rgba(0,0,0,.06),0 8px 24px rgba(0,0,0,.08)}.mkfc__front{background:var(--mkfc-paper);border:1px solid var(--mkfc-line)}.mkfc__back{background:var(--mkfc-back);color:var(--mkfc-back-ink);transform:rotateY(180deg)}.mkfc__label{position:absolute;top:1rem;left:1.25rem;font-family:system-ui,sans-serif;font-size:.72rem;letter-spacing:.12em;text-transform:uppercase;opacity:.6}.mkfc__q{font-size:clamp(1.3rem,3.2vw,2rem);line-height:1.35;margin:0}.mkfc__a{font-size:clamp(1.6rem,4.5vw,2.6rem);line-height:1.25;margin:0 0 .75rem;font-weight:600}.mkfc__note{font-family:system-ui,sans-serif;font-size:clamp(.95rem,2vw,1.1rem);opacity:.85;margin:0;max-width:34ch}.mkfc__hint{position:absolute;bottom:1rem;font-family:system-ui,sans-serif;font-size:.8rem;color:var(--mkfc-muted)}.mkfc__controls{display:flex;justify-content:center;gap:.5rem;margin-top:1.25rem;flex-wrap:wrap}.mkfc__btn{font-family:system-ui,sans-serif;font-size:.95rem;padding:.6rem 1.1rem;border-radius:999px;cursor:pointer;border:1px solid var(--mkfc-line);background:#fff;color:var(--mkfc-ink)}.mkfc__btn:hover{border-color:var(--mkfc-ink)}.mkfc__btn--primary{background:var(--mkfc-accent);border-color:var(--mkfc-accent);color:#fff}.mkfc__btn--primary:hover{filter:brightness(.95);border-color:var(--mkfc-accent)}.mkfc__btn:focus-visible,.mkfc__card:focus-visible{outline:3px solid var(--mkfc-accent);outline-offset:3px}.mkfc__keys{text-align:center;font-family:system-ui,sans-serif;font-size:.78rem;color:var(--mkfc-muted);margin-top:.75rem}@media (max-width:520px){.mkfc__card{min-height:280px}.mkfc__face{padding:2.25rem 1.25rem}}@media (prefers-reduced-motion:reduce){.mkfc__card{transition:none}}.mkfc .mkfc__back,.mkfc .mkfc__back .mkfc__a,.mkfc .mkfc__back .mkfc__note,.mkfc .mkfc__back .mkfc__label{color:#fff !important}.mkfc .mkfc__back .mkfc__note{opacity:.9}