/* The Study District: smart flashcards (flashcards.html). Theme colours only: --paper, --ink, --muted, --line,
   --accent, --on-accent, --gold, so every theme works. */
.fc .wrap { max-width: 820px; }
.fc .lede { color: var(--muted); margin: 0 0 18px; }
.fc-skip { position: absolute; left: -9999px; top: 8px; background: var(--paper); color: var(--ink); padding: 6px 12px; border: 1px solid var(--line); border-radius: 6px; z-index: 10; }
.fc-skip:focus { left: 16px; }
.fc [hidden] { display: none !important; }
.fc :focus-visible { outline: 3px solid var(--gold); outline-offset: 2px; }

.fc-stats { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 10px; margin: 0 0 14px; }
.fc-stat { background: var(--paper); border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; min-width: 0; }
.fc-stat b { display: block; font-size: 1.6rem; line-height: 1.1; color: var(--accent); font-weight: 600; font-variant-numeric: tabular-nums; }
.fc-stat span { color: var(--muted); font-size: .86rem; line-height: 1.3; display: block; }

.fc-filters { background: var(--paper); border: 1px solid var(--line); border-radius: 10px; padding: 0 14px; margin: 0 0 16px; }
.fc-filters > summary { cursor: pointer; padding: 10px 0; display: flex; flex-wrap: wrap; gap: 2px 12px; align-items: baseline; list-style: none; }
.fc-filters > summary::-webkit-details-marker { display: none; }
.fc-filters > summary::before { content: "▸"; color: var(--gold); width: 1em; }
.fc-filters[open] > summary::before { content: "▾"; }
.fc-sumt { font-weight: 600; color: var(--accent); }
.fc-sumd { color: var(--muted); font-size: .9rem; min-width: 0; overflow-wrap: anywhere; }
.fc-fbody { display: grid; gap: 12px; padding: 4px 0 14px; border-top: 1px solid var(--line); padding-top: 12px; }
.fc-row { display: grid; grid-template-columns: 110px minmax(0, 1fr); gap: 6px 12px; align-items: start; }
.fc-row .fc-quick { grid-column: 2; }
.fc-lab { color: var(--muted); font-size: .9rem; padding-top: 4px; }
.fc-chips, .fc-seg { display: flex; flex-wrap: wrap; gap: 6px; }
.fc-chip, .fc-seg label { font: inherit; font-size: .9rem; border: 1px solid var(--line); border-radius: 999px; padding: 3px 12px; background: var(--paper); color: var(--ink); cursor: pointer; display: inline-flex; align-items: center; gap: 6px; line-height: 1.4; }
.fc-chip[aria-pressed="true"] { background: var(--accent); border-color: var(--accent); color: var(--on-accent); }
.fc-chip:hover, .fc-seg label:hover { border-color: var(--accent); }
.fc-seg label:has(input:checked) { border-color: var(--accent); box-shadow: inset 0 0 0 1px var(--accent); }
.fc-seg input { accent-color: var(--accent); margin: 0; }
.fc-quick { display: flex; gap: 14px; font-size: .9rem; }
.fc select { font: inherit; font-size: .95rem; color: var(--ink); background: var(--paper); border: 1px solid var(--line); border-radius: 6px; padding: 4px 8px; min-height: 36px; max-width: 100%; }
.fc-link { font: inherit; background: none; border: 0; padding: 0; color: var(--accent); text-decoration: underline; cursor: pointer; }

.fc-stage { outline: none; }
.fc-loading { color: var(--muted); }
.fc-card { background: var(--paper); border: 1px solid var(--line); border-radius: 14px; padding: 18px 20px 20px; min-height: 230px; box-shadow: 0 1px 0 var(--line); touch-action: pan-y; user-select: text; transition: transform .18s, border-color .15s; position: relative; overflow-wrap: anywhere; }
.fc-card:not(.shown) { cursor: pointer; }
.fc-card.sw-r { border-color: var(--accent); }
.fc-card.sw-l { border-color: var(--gold); }
.fc-meta { display: flex; flex-wrap: wrap; gap: 4px 10px; align-items: baseline; margin: 0 0 10px; font-size: .86rem; color: var(--muted); }
.fc-sub { font-weight: 600; color: var(--ink); font-variant: small-caps; letter-spacing: .04em; font-size: .95rem; }
.fc-hl { border: 1px solid var(--accent); color: var(--accent); border-radius: 999px; padding: 0 7px; font-size: .78rem; }
.fc-kind { margin-left: auto; border: 1px solid var(--line); border-radius: 999px; padding: 0 9px; font-size: .78rem; }
.fc-kind.new { border-color: var(--gold); color: var(--ink); }
.fc-prompt { margin: 0 0 6px; color: var(--muted); font-size: .92rem; font-style: italic; }
.fc-front { font-size: 1.15rem; line-height: 1.45; color: var(--ink); }
.fc-front.term { font-size: 1.7rem; font-weight: 600; line-height: 1.2; color: var(--accent); }
.fc-front.quote { font-style: italic; white-space: pre-line; border-left: 3px solid var(--gold); padding-left: 12px; }
.fc-back { margin-top: 14px; padding-top: 14px; border-top: 1px dashed var(--line); }
.fc-ans { font-size: 1.12rem; line-height: 1.5; color: var(--ink); }
.fc-your { margin: 8px 0 0; color: var(--muted); font-size: .93rem; }
.fc-note { margin: 8px 0 0; color: var(--muted); font-size: .93rem; }
.fc-open { margin: 10px 0 0; font-size: .93rem; }
.fc-open a { color: var(--accent); }
.fc .katex { font-size: 1.02em; }
.fc .katex-display { overflow-x: auto; overflow-y: hidden; padding: 2px 0; }

.fc-btn { font: inherit; font-size: 1rem; display: inline-flex; align-items: center; justify-content: center; gap: 8px; cursor: pointer; border-radius: 999px; padding: 8px 18px; border: 1px solid var(--accent); background: var(--accent); color: var(--on-accent); text-decoration: none; line-height: 1.3; }
a.fc-btn:any-link { color: var(--on-accent); }
.fc-btn.ghost { background: var(--paper); color: var(--ink); border-color: var(--line); }
a.fc-btn.ghost:any-link { color: var(--ink); }
.fc-btn.ghost:hover { border-color: var(--accent); }
.fc-flip { width: 100%; margin-top: 12px; padding: 12px 18px; font-size: 1.05rem; }
.fc kbd { font-family: inherit; font-size: .75rem; border: 1px solid currentColor; border-radius: 4px; padding: 0 5px; opacity: .75; line-height: 1.4; }
.fc-grades { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 8px; margin-top: 12px; }
.fc-grades[hidden] { display: none; }
.fc-g { font: inherit; cursor: pointer; display: flex; flex-direction: column; align-items: center; gap: 2px; padding: 8px 6px; border-radius: 10px; border: 1px solid var(--line); background: var(--paper); color: var(--ink); min-width: 0; }
.fc-g b { font-weight: 600; font-size: 1rem; }
.fc-g span { font-size: .8rem; color: var(--muted); }
.fc-g:hover { border-color: var(--accent); }
.fc-g.g1 { border-color: var(--gold); }
.fc-g.g3 { background: var(--accent); border-color: var(--accent); color: var(--on-accent); }
.fc-g.g3 span { color: var(--on-accent); opacity: .85; }
.fc-hint { color: var(--muted); font-size: .86rem; margin: 10px 0 0; text-align: center; }
.fc-undo { text-align: center; margin: 6px 0 0; font-size: .9rem; }
.fc-done { background: var(--paper); border: 1px solid var(--line); border-radius: 14px; padding: 20px; }
.fc-done h2 { margin: 0 0 6px; }
.fc-acts { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 10px; }

@media (max-width: 600px) {
  .fc-stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .fc-row { grid-template-columns: 1fr; }
  .fc-row .fc-quick { grid-column: 1; }
  .fc-lab { padding-top: 0; }
  .fc-card { padding: 14px 14px 16px; min-height: 200px; }
  .fc-front.term { font-size: 1.45rem; }
  .fc-grades { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (prefers-reduced-motion: reduce) { .fc-card { transition: none; } }
@media (forced-colors: active) { .fc-chip[aria-pressed="true"], .fc-g.g3 { forced-color-adjust: none; } }