/* 成语填空 */
.cf-head{display:flex;align-items:center;gap:.75rem;flex-wrap:wrap;margin-bottom:.75rem}
.cf-no{font-size:.8125rem;color:#8a9199}
.cf-quiz{border:1px solid #e4e8ee;border-radius:.5rem;background:#fafbfd;padding:1.25rem 1rem;text-align:center;margin-bottom:.9rem}
.cf-word{display:flex;justify-content:center;gap:.4rem;flex-wrap:wrap}
.cf-char{display:inline-flex;align-items:center;justify-content:center;width:3rem;height:3rem;border:1px solid #e4e8ee;
    border-radius:.5rem;background:#fff;font-size:1.5rem;color:#1f2937}
.cf-blank{border-style:dashed;border-color:var(--site-primary);color:var(--site-primary);font-weight:700}
.cf-blank.is-right{border-style:solid;border-color:#15c377;background:#e7f7ef;color:#0f9c5d}
.cf-meta{margin-top:.75rem;font-size:.75rem;color:#8a9199}
.cf-opts{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:.6rem;margin-bottom:.9rem}
.cf-opt{position:relative;padding:.9rem .25rem;border:1px solid #dfe4ec;border-radius:.5rem;background:#fff;cursor:pointer;
    transition:border-color .15s,background .15s,transform .1s}
.cf-opt:hover:not(:disabled){border-color:var(--site-primary);background:#f7fffd}
.cf-opt:active:not(:disabled){transform:scale(.97)}
.cf-opt:disabled{cursor:default}
.cf-opt-no{position:absolute;top:.25rem;left:.35rem;font-size:.6875rem;color:#b8c0cc}
.cf-opt-ch{font-size:1.5rem;line-height:1.2;color:#1f2937}
.cf-opt.is-right{border-color:#15c377;background:#e7f7ef}
.cf-opt.is-right .cf-opt-ch{color:#0f9c5d;font-weight:700}
.cf-opt.is-wrong{border-color:#f96868;background:#fdecec}
.cf-opt.is-wrong .cf-opt-ch{color:#d64545}
.cf-opt.is-off{opacity:.35}
.cf-bar{display:flex;gap:.5rem;flex-wrap:wrap;margin-bottom:.5rem}
@media (max-width:575.98px){
    .cf-char{width:2.5rem;height:2.5rem;font-size:1.25rem}
    .cf-opts{grid-template-columns:repeat(2,minmax(0,1fr))}
}