.cai-fc{--cai-fc-pad:1.5rem}.cai-fc-modes{border:1px solid var(--cai-border);border-radius:calc(var(--cai-radius-sm) + 3px);background:var(--cai-bg-soft);gap:2px;max-width:100%;padding:3px;display:inline-flex}.cai-fc-mode{border-radius:var(--cai-radius-sm);min-height:2.25rem;color:var(--cai-muted);font:inherit;white-space:nowrap;cursor:pointer;transition:background var(--cai-dur), color var(--cai-dur), box-shadow var(--cai-dur);background:0 0;border:0;justify-content:center;align-items:center;padding:.35rem .85rem;font-size:.875rem;font-weight:550;display:inline-flex}.cai-fc-mode:hover{color:var(--cai-text-strong)}.cai-fc-mode[aria-selected=true]{background:var(--cai-surface-3);color:var(--cai-text-strong);box-shadow:var(--cai-shadow-sm)}:root[data-theme=light] .cai-fc-mode[aria-selected=true]{background:var(--cai-surface);box-shadow:var(--cai-shadow-sm), 0 0 0 1px var(--cai-border)}.cai-fc-mode:focus-visible{outline:2px solid var(--cai-accent);outline-offset:1px}.cai-fc-mode [lang=zh]{font-family:var(--cai-font-accent)}.cai-fc-stats{color:var(--cai-muted);font-variant-numeric:tabular-nums;margin:.9rem 0 1.25rem;font-size:.875rem}.cai-fc-stats span{white-space:nowrap}.cai-fc-stats b{color:var(--cai-text-strong);font-weight:650}.cai-fc-stats i{color:var(--cai-faint);margin:0 .2rem;font-style:normal}.cai-fc-stats .is-due b{color:var(--cai-accent-text)}.cai-fc-deck{padding-bottom:12px;position:relative}.cai-fc-deck:has(.cai-fc-card[hidden]){padding-bottom:0}.cai-fc-deck:before,.cai-fc-deck:after{content:"";border:1px solid var(--cai-paper-border);border-radius:var(--cai-radius-lg);background:var(--cai-paper-2);position:absolute;inset:0 0 12px}.cai-fc-deck:before{opacity:.45;transform:translateY(12px)scale(.94)}.cai-fc-deck:after{opacity:.75;transform:translateY(6px)scale(.97)}.cai-fc-deck:has(.cai-fc-card[hidden]):before,.cai-fc-deck:has(.cai-fc-card[hidden]):after{display:none}.cai-fc-card{z-index:1;border:1px solid var(--cai-paper-border);border-radius:var(--cai-radius-lg);background:linear-gradient(180deg, var(--cai-paper-1), var(--cai-paper-2));min-height:20rem;color:var(--cai-ink);box-shadow:var(--cai-shadow);transform-origin:50%;flex-direction:column;display:flex;position:relative;overflow:hidden}.cai-fc-card[hidden]{display:none}.cai-fc-progress{background:color-mix(in srgb, var(--cai-paper-border) 60%, transparent);height:3px}.cai-fc-progress i{background:var(--cai-jade);width:0;height:100%;transition:width .4s var(--cai-ease);display:block}.cai-fc-top{padding:1rem var(--cai-fc-pad) 0;justify-content:space-between;align-items:baseline;gap:1rem;display:flex}.cai-fc-src{letter-spacing:.08em;text-transform:uppercase;min-width:0;color:var(--cai-gold-text);text-overflow:ellipsis;white-space:nowrap;font-size:.72rem;font-weight:650;overflow:hidden}.cai-fc-left{color:var(--cai-faint);font-variant-numeric:tabular-nums;flex:none;font-size:.78rem}.cai-fc-face{padding:1.5rem var(--cai-fc-pad) 1.75rem;text-align:center;flex-direction:column;flex:1;justify-content:center;gap:1.25rem;display:flex}.cai-fc-q{font-family:var(--cai-font-display);letter-spacing:0;color:var(--cai-ink);text-wrap:balance;transition:font-size var(--cai-dur) var(--cai-ease), color var(--cai-dur);font-size:1.4rem;font-weight:600;line-height:1.4}.cai-fc-card.is-flipped .cai-fc-q{color:color-mix(in srgb, var(--cai-ink) 62%, transparent);font-size:1.05rem;font-weight:550}.cai-fc-a{color:var(--cai-ink);text-wrap:pretty;padding-top:1.35rem;font-size:1.15rem;line-height:1.6;position:relative}.cai-fc-a:before{content:"";border-top:1px dashed var(--cai-paper-border);position:absolute;top:0;left:15%;right:15%}.cai-fc-a b,.cai-fc-a strong,.cai-fc-q b,.cai-fc-q strong{color:var(--cai-ink);font-weight:700}.cai-fc code{font-family:var(--cai-font-mono);border-radius:var(--cai-radius-xs);background:color-mix(in srgb, var(--cai-paper-border) 45%, transparent);color:var(--cai-ink);overflow-wrap:anywhere;padding:.1em .35em;font-size:.85em}.cai-fc .katex-display{margin:.5rem 0;overflow:auto hidden}.cai-fc-note{color:color-mix(in srgb, var(--cai-ink) 70%, transparent);margin-top:.6rem;font-size:.9rem;line-height:1.55}.cai-fc-mine{color:color-mix(in srgb, var(--cai-ink) 80%, transparent);margin-top:.75rem;font-size:.9rem;font-style:italic}.cai-fc-mine span{letter-spacing:.08em;text-transform:uppercase;color:var(--cai-gold-text);font-size:.7rem;font-style:normal;font-weight:650;display:block}.cai-fc-gl{text-align:left;gap:.45rem;display:inline-grid}.cai-fc-gl>div:not(.cai-fc-note){flex-wrap:wrap;align-items:baseline;gap:.3rem .6rem;display:flex}.cai-fc-tag{border-radius:var(--cai-radius-xs);border:1px solid var(--cai-paper-border);min-width:2.6rem;font-family:var(--cai-font-mono);text-align:center;color:color-mix(in srgb, var(--cai-ink) 65%, transparent);flex:none;padding:.05rem .4rem;font-size:.68rem;font-weight:650}.cai-fc-tag[lang=zh]{font-family:var(--cai-font-accent)}.cai-fc-zh{font-family:var(--cai-font-accent);font-size:1.35rem;line-height:1.2}.cai-fc-py{color:color-mix(in srgb, var(--cai-ink) 62%, transparent);font-size:.95rem}.cai-fc-gl .cai-fc-note{margin-top:.15rem}.cai-fc-actions{padding:0 var(--cai-fc-pad) var(--cai-fc-pad)}.cai-fc-show{border-radius:var(--cai-radius-md);justify-content:center;width:100%;max-width:22rem;min-height:3rem;margin:0 auto;font-size:.97rem;display:flex}.cai-fc-show[hidden]{display:none}.cai-fc kbd{border-radius:var(--cai-radius-xs);font-family:var(--cai-font-body);opacity:.7;border:1px solid;padding:.05rem .4rem;font-size:.7rem;font-weight:600;line-height:1.4}.cai-fc-grades-q{text-align:center;color:color-mix(in srgb, var(--cai-ink) 62%, transparent);margin-bottom:.6rem;font-size:.8125rem}.cai-fc-grades-row{grid-template-columns:repeat(4,minmax(0,1fr));gap:.5rem;display:grid}.cai-fc-grade{--g:var(--cai-steel-text);--g-soft:var(--cai-steel-soft);--g-line:var(--cai-steel-line);border:1px solid var(--g-line);border-radius:var(--cai-radius);background:var(--g-soft);min-height:3.6rem;color:var(--g);font:inherit;cursor:pointer;transition:background var(--cai-dur), border-color var(--cai-dur), transform var(--cai-dur) var(--cai-ease);flex-direction:column;align-items:center;gap:.1rem;padding:.55rem .5rem;display:flex;position:relative}.cai-fc-grade:hover{border-color:var(--g);background:color-mix(in srgb, var(--g) 16%, transparent);transform:translateY(-1px)}.cai-fc-grade:active{transform:translateY(0)}.cai-fc-grade:focus-visible{outline:2px solid var(--g);outline-offset:2px}.cai-fc-grade span{font-size:.9375rem;font-weight:650}.cai-fc-grade small{opacity:.85;font-variant-numeric:tabular-nums;font-size:.75rem;font-weight:550}.cai-fc-grade kbd{border-color:var(--g-line);padding:0 .3rem;font-size:.65rem;position:absolute;top:.35rem;left:.4rem}.cai-fc-grade.is-again{--g:var(--cai-bad);--g-soft:var(--cai-bad-bg);--g-line:var(--cai-bad-line)}.cai-fc-grade.is-hard{--g:var(--cai-gold-text);--g-soft:var(--cai-gold-soft);--g-line:var(--cai-gold-line)}.cai-fc-grade.is-good{--g:var(--cai-jade-text);--g-soft:var(--cai-jade-soft);--g-line:var(--cai-jade-line)}.cai-fc-empty{border:1px dashed var(--cai-border-strong);border-radius:var(--cai-radius-lg);background:var(--cai-bg-soft);text-align:center;flex-direction:column;align-items:center;padding:2.75rem 1.25rem 2.5rem;display:flex}.cai-fc-empty[hidden]{display:none}.cai-fc-seal{background:var(--cai-surface-2);border:1px solid var(--cai-border);width:4rem;height:4rem;color:var(--cai-muted);border-radius:2px;place-items:center;display:grid}.cai-fc-seal.is-ok{background:var(--cai-jade-soft);border-color:var(--cai-jade-line);color:var(--cai-jade-text)}.cai-fc-empty-cap{color:var(--cai-faint);margin-top:.85rem;font-size:.78rem}.cai-fc-empty-cap span{font-family:var(--cai-font-accent);color:var(--cai-muted)}.cai-fc-empty-title{font-family:var(--cai-font-display);color:var(--cai-text-strong);margin-top:.85rem;font-size:1.125rem;font-weight:650}.cai-fc-empty p{max-width:28rem;color:var(--cai-muted);text-wrap:pretty;margin:.4rem 0 0;font-size:.9rem;line-height:1.55}.cai-fc-empty .cai-btn{margin-top:1.1rem}@media (pointer:coarse){.cai-fc .cai-keys-hint{display:none}}@media (width<=40rem){.cai-fc{--cai-fc-pad:1.1rem}.cai-fc-modes{grid-template-columns:1fr 1fr;width:100%;display:grid}.cai-fc-mode{padding-inline:.5rem;font-size:.8125rem}.cai-fc-card{min-height:18rem}.cai-fc-q{font-size:1.2rem}.cai-fc-a{font-size:1.05rem}.cai-fc-grades-row{gap:.35rem}.cai-fc-grade{padding-inline:.25rem}.cai-fc-grade span{font-size:.875rem}.cai-fc-grade kbd{display:none}}