/* Вариант 4: доказательство в картинках */
.pf-sets { display: flex; flex-wrap: wrap; align-items: center; gap: 0.5rem 0.8rem; margin: 0.2rem 0 0.4rem; }
.pf-sets-l { font-weight: 600; }
.pf-sets-b { display: flex; flex-wrap: wrap; gap: 0.4rem; }
.pf-set { font-weight: 700; font-variant-numeric: tabular-nums; }
.pf-set[aria-pressed="true"] { background: var(--ink); border-color: var(--ink); color: #fff; }
.pf-block { margin-top: 1.2rem; }
.pf-block h2 { margin-top: 1.4rem; }
.pf-tag { font-size: 0.8em; font-weight: 600; color: var(--muted); white-space: nowrap; }
.pf-cap { color: var(--muted); margin: 0 0 0.8rem; }
.pf-nw { white-space: nowrap; }
.pf-sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* Общие стрелки (круг, деревья) */
.pf-arrow { animation: pf-in 0.35s ease both; animation-delay: var(--d, 0ms); }
.pf-arrow .ln { fill: none; stroke-width: 3; stroke-linecap: butt; }
.pf-arrow.to-w .ln { stroke: var(--win); }
.pf-arrow.to-l .ln { stroke: var(--lose); }
.pf-arrow.ghost .ln { stroke: #9aa3b1; stroke-dasharray: 6 5; }
.pf-arrow.key .ln { stroke-width: 5.5; }
.pf-arrow .glow { fill: none; stroke: var(--lose); stroke-opacity: 0.22; stroke-width: 16; stroke-linecap: round; animation: pf-glow 1.3s ease-in-out infinite; }
.pf-arrow text { font: 700 18px var(--font); text-anchor: middle; dominant-baseline: central; paint-order: stroke; stroke: #fff; stroke-width: 5px; stroke-linejoin: round; }
.pf-arrow.to-w text { fill: var(--win); }
.pf-arrow.to-l text { fill: var(--lose); }
.pf-arrow.key text { font-size: 21px; }
.pf-arrow.ghost text { fill: var(--bad); }
.pf-ah-w path { fill: var(--win); }
.pf-ah-l path { fill: var(--lose); }
.pf-ah-g path { fill: #9aa3b1; }

/* Блок 1: круг остатков. Диаметр --pf-d растёт с «А+», но круг помещается в экран под шапкой */
.pf-b1 { --pf-d: min(26rem, calc(100vh - 4.5rem)); display: grid; grid-template-columns: minmax(0, min(var(--pf-d), 55%)) minmax(0, 1fr); gap: 1.2rem 2rem; align-items: start; }
@supports (height: 100svh) { .pf-b1 { --pf-d: min(26rem, calc(100svh - 4.5rem)); } }
.pf-circle { position: relative; width: 100%; max-width: var(--pf-d); aspect-ratio: 1 / 1; }
.pf-circle > svg { position: absolute; inset: 0; width: 100%; height: 100%; overflow: visible; }
.pf-node { position: absolute; width: 15%; height: 15%; transform: translate(-50%, -50%); border-radius: 50%; border: 0; padding: 0; font: inherit; color: #fff; cursor: pointer; display: flex; flex-direction: column; align-items: center; justify-content: center; line-height: 1; box-shadow: 0 1px 3px rgba(17, 24, 39, 0.25); transition: box-shadow 0.2s; }
.pf-node.win { background: var(--win); }
.pf-node.lose { background: var(--lose); }
.pf-node .rn { font-size: 1.45rem; font-weight: 800; }
.pf-node .rl { font-size: 0.8rem; font-weight: 700; margin-top: 0.1rem; }
.pf-node.sel { box-shadow: 0 0 0 3px #fff, 0 0 0 6px var(--ink); }
.pf-node:focus-visible { outline: 3px solid var(--ink); outline-offset: 5px; }
/* Значок снаружи кружка, по направлению от центра круга (--ux, --uy из JS); translate не мешает анимации transform */
.pf-badge { display: none; position: absolute; left: calc(50% + var(--ux, 0.6) * 50%); top: calc(50% + var(--uy, -0.8) * 50%); translate: calc(-50% + var(--ux, 0.6) * 30%) calc(-50% + var(--uy, -0.8) * 30%); padding: 0.1rem 0.35rem; border-radius: 999px; background: #fff; border: 2px solid var(--ok); color: var(--ok); font-size: 0.78rem; font-weight: 800; white-space: nowrap; }
.pf-node.done .pf-badge, .pf-node.fail .pf-badge { display: block; animation: pf-pop 0.3s ease both; animation-delay: var(--d, 0ms); }
.pf-node.fail .pf-badge { border-color: var(--bad); color: var(--bad); }

.pf-side { display: grid; gap: 0.3rem; align-content: start; }
.pf-side .pf-cap { margin: 0 0 0.3rem; }
.pf-step { min-height: 3em; margin: 0.4rem 0; font-size: 1.05rem; font-variant-numeric: tabular-nums; }
.pf-checks { list-style: none; padding: 0; margin: 0.2rem 0 0.4rem; display: grid; gap: 0.5rem; font-size: 1.08rem; }
.pf-checks li { display: flex; align-items: center; gap: 0.6rem; }
.pf-mark { flex: none; display: inline-grid; place-items: center; width: 2rem; height: 2rem; border-radius: 50%; border: 2px solid var(--line); background: var(--panel); color: var(--muted); font-weight: 800; }
.pf-mark.ok { background: var(--ok); border-color: var(--ok); color: #fff; animation: pf-pop 0.3s ease both; }
.pf-mark.bad { background: var(--bad); border-color: var(--bad); color: #fff; }
.pf-concl { min-height: 1px; }
.pf-res { margin: 0.4rem 0 0.2rem; font-size: 1.15rem; font-weight: 700; }
.pf-res.ok { color: var(--ok); }
.pf-res.bad { color: var(--bad); }
.pf-small { margin: 0.2rem 0; color: var(--muted); }
.pf-legend { margin-top: 0.4rem; }
.pf-legend i { width: 1.8em; height: 4px; border-radius: 2px; vertical-align: middle; }
.pf-legend .pf-lw { background: var(--win); }
.pf-legend .pf-ll { background: var(--lose); }

.pf-table-wrap { overflow-x: auto; }
.pf-table { border-collapse: collapse; margin: 0.3rem 0; font-variant-numeric: tabular-nums; }
.pf-table caption { text-align: left; color: var(--muted); padding-bottom: 0.3rem; }
.pf-table th, .pf-table td { border: 1px solid var(--line); padding: 0.35rem 0.7rem; text-align: center; }
.pf-table thead th { background: var(--panel); }
.pf-table td.w { color: var(--win); font-weight: 700; }
.pf-table td.l { color: var(--lose); font-weight: 700; }
.pf-table td.hit { background: var(--lose-soft); font-weight: 700; }
.pf-note { margin: 0.2rem 0 0.6rem; font-size: 0.9rem; }

/* Блок 2: окно меток */
.pf-ctrl { margin-bottom: 0.4rem; }
.pf-k { color: var(--muted); font-weight: 600; }
.pf-win-scroll { overflow-x: auto; }
.pf-track { position: relative; display: grid; grid-template-columns: repeat(var(--n, 8), minmax(1.5rem, 3.3rem)); gap: 4px; padding: 58px 10px 10px; }
.pf-track .cell { height: 3rem; }
.pf-track .cell.pf-new { animation: pf-pop 0.4s ease both; }
.pf-frame { position: absolute; border: 4px solid var(--ink); border-radius: 12px; pointer-events: none; transition: left 0.4s ease 0.15s, width 0.4s ease 0.15s; }
.pf-frame.still { transition: none; }
.pf-frame.first, .pf-frame.hit { border-color: var(--ok); animation: pf-flash 0.55s ease 3; }
.pf-arc { position: absolute; left: 0; top: 0; overflow: visible; pointer-events: none; }
.pf-arc-ln { fill: none; stroke: var(--ok); stroke-width: 3; animation: pf-in 0.4s ease both; }
.pf-arc .pf-ah-g path { fill: var(--ok); }
.pf-arc text { font: 800 0.95rem var(--font); fill: var(--ok); text-anchor: middle; paint-order: stroke; stroke: #fff; stroke-width: 5px; stroke-linejoin: round; }
.pf-wins { list-style: none; padding: 0; margin: 0.3rem 0 0.4rem; display: flex; flex-wrap: wrap; gap: 0.35rem; }
.pf-wins li { display: inline-flex; align-items: center; gap: 0.4rem; padding: 0.2rem 0.6rem; border: 1px solid var(--line); border-radius: 999px; background: #fff; font-variant-numeric: tabular-nums; }
.pf-wr { color: var(--muted); font-size: 0.85rem; }
.pf-wl { font-family: var(--mono); font-weight: 800; letter-spacing: 0.05em; }
.pf-wl .w { color: var(--win); }
.pf-wl .l { color: var(--lose); }
.pf-wins li.cur { border-color: var(--ink); }
.pf-wins li.hit { border: 2px solid var(--ok); background: #e7f6ec; animation: pf-flash 0.55s ease 3; }

/* Блок 3: деревья и двойная лента */
.pf-trees { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; }
.pf-tree { margin: 0; padding: 0.6rem 0.8rem 0.4rem; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; }
.pf-tree h3 { margin: 0 0 0.2rem; }
.pf-set-t { font-variant-numeric: tabular-nums; }
.pf-t { display: block; width: 100%; max-width: 460px; height: auto; margin: 0 auto; }
html.big .pf-t { max-width: 600px; }
.pf-t .nd { animation: pf-in 0.35s ease both; }
.pf-t .disc { stroke: #fff; stroke-width: 2; }
.pf-t .nd.win .disc { fill: var(--win); }
.pf-t .nd.lose .disc { fill: var(--lose); }
.pf-t .nd.ghost .disc { fill: #fff; stroke: #9aa3b1; stroke-width: 2; stroke-dasharray: 5 4; }
.pf-t .ring { fill: none; stroke: var(--ink); stroke-width: 3; }
.pf-t .nn { font: 800 19px var(--font); fill: #fff; text-anchor: middle; dominant-baseline: central; }
.pf-t .nl { font: 700 14px var(--font); fill: #fff; text-anchor: middle; dominant-baseline: central; }
.pf-t .nd.ghost .nn { fill: #8a93a1; }
.pf-t .pf-no { font: 700 14px var(--font); fill: var(--bad); text-anchor: middle; dominant-baseline: central; }
.pf-tree figcaption p { margin: 0.2rem 0; }
.pf-tl1 { font-weight: 700; }
.pf-tl2 { color: var(--muted); }
.pf-cap2 { margin-top: 1.2rem; }

.pf-dbl { display: grid; gap: 0.7rem; }
.pf-band { display: grid; grid-template-columns: auto repeat(var(--c, 18), minmax(0, 1fr)); gap: 4px; }
.pf-rowlab, .pf-col { display: grid; grid-template-rows: 1.3rem 2.4rem 2.4rem; gap: 4px; }
.pf-rowlab span { display: flex; align-items: center; padding-right: 0.4rem; font-size: 0.85rem; color: var(--muted); white-space: nowrap; }
.pf-rowlab b { color: var(--ink); }
.pf-rowlab i { font-style: normal; margin-left: 0.3em; }
.pf-col { border-radius: 7px; }
.pf-col .cell { height: auto; border-radius: 6px; }
.pf-cn { align-self: end; text-align: center; font-size: 0.78rem; color: var(--muted); font-variant-numeric: tabular-nums; }
.pf-col.chg { outline: 2px solid var(--ink); }
.pf-col.chg .pf-cn { color: var(--ink); font-weight: 800; }
.pf-col.focus .pf-cn { background: var(--ink); color: #fff; border-radius: 5px 5px 0 0; }
.pf-diff { margin: 0.6rem 0 0; }

@keyframes pf-in { from { opacity: 0; } to { opacity: 1; } }
@keyframes pf-pop { 0% { opacity: 0; transform: scale(0.6); } 70% { transform: scale(1.12); } 100% { opacity: 1; transform: scale(1); } }
@keyframes pf-glow { 0%, 100% { stroke-opacity: 0.14; } 50% { stroke-opacity: 0.38; } }
@keyframes pf-flash { 0%, 100% { background-color: transparent; } 50% { background-color: rgba(21, 128, 61, 0.2); } }

@media (max-width: 820px) {
  .pf-b1 { grid-template-columns: minmax(0, 1fr); }
  .pf-circle { margin: 0 auto; }
  .pf-trees { grid-template-columns: minmax(0, 1fr); }
}
@media (max-width: 640px) {
  .pf-node .rn { font-size: 1.25rem; }
  .pf-track { padding: 56px 8px 8px; gap: 3px; }
  .pf-track .cell { height: 2.6rem; }
  .pf-band { gap: 3px; }
  .pf-rowlab, .pf-col { grid-template-rows: 1.2rem 2.2rem 2.2rem; gap: 3px; }
  .pf-rowlab i { display: none; }
  .pf-rowlab span { font-size: 0.8rem; padding-right: 0.25rem; }
  .pf-step { font-size: 1rem; }
  /* Круг и вывод помещаются в экран телефона вместе */
  .pf-b1 { row-gap: 0.4rem; }
  .pf-b1 .pf-step { margin: 0.2rem 0; }
  .pf-checks { margin: 0; gap: 0.3rem; }
}
@media (prefers-reduced-motion: reduce) {
  .pf-arrow, .pf-arrow .glow, .pf-node .pf-badge, .pf-mark.ok, .pf-frame, .pf-track .cell.pf-new, .pf-wins li.hit, .pf-arc-ln, .pf-t .nd { animation: none !important; transition: none !important; }
}