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var(--border);background:var(--bg);backface-visibility:hidden;border-radius:14px;flex-direction:column;grid-area:1/1;gap:14px;padding:24px 26px;display:flex;box-shadow:0 8px 24px #0f172a0f}.fc-back{background:var(--surface);border-color:var(--accent-border);transform:rotateY(180deg)}.fc-face-head{justify-content:space-between;align-items:center;gap:8px;display:flex}.fc-side{color:var(--text-faint);letter-spacing:.08em;text-transform:uppercase;font-size:11.5px;font-weight:700}.fc-lock-tag{background:var(--tip-soft);color:var(--tip);border-radius:999px;align-items:center;gap:4px;padding:2px 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var(--border-soft);margin-top:6px}.fc-jump-wrap>summary{min-height:44px;color:var(--text-muted);cursor:pointer;align-items:center;font-size:13px;display:flex}.fc-jump{grid-template-columns:repeat(auto-fill,minmax(44px,1fr));gap:6px;padding-bottom:8px;display:grid}.fc-jump-btn{border:1px solid var(--border-soft);background:var(--bg);min-height:44px;color:var(--text-body);font:inherit;font-variant-numeric:tabular-nums;cursor:pointer;border-radius:8px;justify-content:center;align-items:center;gap:2px;font-size:13px;display:inline-flex}.fc-jump-btn svg{color:var(--text-faint)}.fc-jump-btn[aria-current=true]{border-color:var(--accent);background:var(--accent);color:var(--on-accent)}.fc-jump-btn[aria-current=true] svg{color:inherit}.fc-reference,.fc-tips{margin-top:44px}.fc-reference h2,.fc-tips h2{color:var(--text-strong);font-family:var(--font-heading);margin:0 0 8px;font-size:24px;font-weight:700}.fc-reference h2{font-family:var(--font-heading);font-weight:700}.fc-reference .fc-reference-intro{color:var(--text-muted);margin:0 0 16px;font-size:14px}.fc-reference-list{flex-direction:column;gap:10px;display:flex}.fc-ref{border:1px solid var(--border-soft);background:var(--bg);border-radius:8px;overflow:hidden}.fc-ref>summary{min-height:48px;color:var(--text-strong);cursor:pointer;align-items:center;gap:10px;padding:12px 16px;font-size:15px;font-weight:400;list-style:none;display:flex}.fc-ref>summary::-webkit-details-marker{display:none}.fc-ref>summary:before{content:"";border-top:5px solid #0000;border-bottom:5px solid #0000;border-left:8px solid;flex:none;width:0;height:0;transition:transform .15s}.fc-ref[open]>summary:before{transform:rotate(90deg)}.fc-ref>summary:focus-visible{outline:2px solid var(--accent);outline-offset:-2px}.fc-ref-front{flex:1;min-width:0}.fc-ref-lock{color:var(--text-faint);flex:none}.fc-ref>.fc-ref-answer,.fc-ref>.fc-ref-locked{border-top:1px solid var(--border-soft);color:var(--text-muted);white-space:pre-line;margin:0;padding:14px 16px 16px;font-size:14px;line-height:1.65}.fc-ref-locked a{color:var(--accent)}.fc-tips ul{color:var(--text-body);margin:0;padding-left:20px;font-size:14.5px;line-height:1.7}@media (max-width:560px){.fc-face{padding:20px 18px}.fc-front .fc-text{font-size:18px}.fc-card{min-height:220px}}@media (prefers-reduced-motion:reduce){.fc-card,.fc-ref>summary:before{transition:none}}