:root {
  color-scheme: light;
  --bg: #fcfcfb; --bg-2: #f1f0ec; --bg-3: #e6e4de; --surface: #ffffff;
  --ink: #0b0b0b; --ink-2: #52514e; --ink-3: #8a8884; --line: #d6d4ce; --line-2: #bdbab2;
  --accent: #2a78d6; --accent-bg: #dbe9fb; --accent-ink: #1c5cab;
  --ok: #0f7a52; --ok-bg: #d5f2e5; --bad: #c43b3a; --bad-bg: #fbdcdb; --warn: #a66d00; --warn-bg: #fdefc8;
  --c0: #2a78d6; --c1: #eb6834; --c2: #1baf7a; --c3: #8a8884;
  --vertex: #ffffff; --vertex-stroke: #52514e; --edge: #8a8884; --edge-dim: #d6d4ce;
  --focus: #eda100;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Noto Sans", "Helvetica Neue", Arial, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --bg: #1a1a19; --bg-2: #232322; --bg-3: #2e2e2c; --surface: #202020;
    --ink: #f3f2ee; --ink-2: #c3c2b7; --ink-3: #8f8e86; --line: #3a3a37; --line-2: #4c4b47;
    --accent: #3987e5; --accent-bg: #1c3a62; --accent-ink: #9ec5f4;
    --ok: #3fc98f; --ok-bg: #143d2c; --bad: #e66767; --bad-bg: #4a1f1f; --warn: #e0a830; --warn-bg: #3f3214;
    --c0: #3987e5; --c1: #d95926; --c2: #199e70; --c3: #8f8e86;
    --vertex: #2a2a28; --vertex-stroke: #c3c2b7; --edge: #8f8e86; --edge-dim: #3a3a37;
    --focus: #eda100;
  }
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #1a1a19; --bg-2: #232322; --bg-3: #2e2e2c; --surface: #202020;
  --ink: #f3f2ee; --ink-2: #c3c2b7; --ink-3: #8f8e86; --line: #3a3a37; --line-2: #4c4b47;
  --accent: #3987e5; --accent-bg: #1c3a62; --accent-ink: #9ec5f4;
  --ok: #3fc98f; --ok-bg: #143d2c; --bad: #e66767; --bad-bg: #4a1f1f; --warn: #e0a830; --warn-bg: #3f3214;
  --c0: #3987e5; --c1: #d95926; --c2: #199e70; --c3: #8f8e86;
  --vertex: #2a2a28; --vertex-stroke: #c3c2b7; --edge: #8f8e86; --edge-dim: #3a3a37;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
html:lang(zh) { --sans: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", "Noto Sans SC", "Source Han Sans SC", sans-serif; }
html:lang(ja) { --sans: system-ui, -apple-system, "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic UI", Meiryo, "Noto Sans CJK JP", "Noto Sans JP", sans-serif; }
html:lang(ko) { --sans: system-ui, -apple-system, "Apple SD Gothic Neo", "Malgun Gothic", "Noto Sans CJK KR", "Noto Sans KR", sans-serif; }
html:lang(ar) { --sans: system-ui, -apple-system, "Segoe UI", "SF Arabic", "Geeza Pro", "Noto Sans Arabic", "Noto Naskh Arabic", Tahoma, "DejaVu Sans", sans-serif; }
html:lang(he) { --sans: system-ui, -apple-system, "Segoe UI", "SF Hebrew", "Arial Hebrew", "Noto Sans Hebrew", Arial, "DejaVu Sans", sans-serif; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 16px/1.5 var(--sans); overflow-x: hidden; }
a { color: var(--accent-ink); }
h1 { font-size: 1.7rem; margin: .2rem 0 .3rem; line-height: 1.2; }
h1 .code { font: 600 .8rem var(--mono); color: var(--accent-ink); background: var(--accent-bg); border-radius: 6px; padding: .1rem .45rem; vertical-align: middle; }
h2 { font-size: 1.25rem; margin: 0 0 .4rem; }
h3 { font-size: 1.05rem; margin: 1rem 0 .3rem; }
p { margin: .4rem 0 .8rem; }
.muted { color: var(--ink-2); }
.small { font-size: .85rem; }
code, .mono { font-family: var(--mono); font-size: .9em; }
header.site { display: flex; flex-wrap: wrap; gap: .4rem 1rem; align-items: baseline; padding: .6rem 16px; background: var(--bg-2); border-bottom: 1px solid var(--line); font-size: .95rem; }
header.site > a:first-child { font-weight: 700; color: var(--ink); text-decoration: none; }
header.site nav { display: flex; flex-wrap: wrap; gap: .2rem .7rem; }
header.site nav a { color: var(--ink-2); text-decoration: none; }
header.site nav a[aria-current="page"] { color: var(--accent-ink); font-weight: 600; text-decoration: underline; }
main { max-width: 1100px; margin: 0 auto; padding: 1rem 16px 3rem; }
footer.site { text-align: center; color: var(--ink-3); font-size: .85rem; padding: 1rem 16px 2rem; }
.lede { font-size: 1.05rem; color: var(--ink-2); max-width: 70ch; }

section.panel { background: var(--surface); border: 1px solid var(--line); border-radius: 10px; padding: 1rem; margin: 1.1rem 0; }
section.panel > h2 { display: flex; align-items: baseline; gap: .6rem; flex-wrap: wrap; }
section.panel > h2 .step { font-size: .8rem; font-weight: 600; color: var(--accent-ink); background: var(--accent-bg); border-radius: 999px; padding: .05rem .55rem; }
.two-col { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 1rem; align-items: start; }
.three-col { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr) minmax(0, 1fr); gap: 1rem; align-items: start; }
@media (max-width: 760px) { .two-col, .three-col { grid-template-columns: minmax(0, 1fr); } }
.col-wide { grid-column: 1 / -1; }

.controls { display: flex; flex-wrap: wrap; gap: .5rem .8rem; align-items: center; margin: .3rem 0 .8rem; }
.controls label { display: inline-flex; align-items: center; gap: .35rem; font-size: .9rem; color: var(--ink-2); }
button, .btn { font: inherit; font-size: .92rem; padding: .35rem .8rem; border-radius: 7px; border: 1px solid var(--line-2); background: var(--bg-2); color: var(--ink); cursor: pointer; }
button:hover { background: var(--bg-3); }
button.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
button.primary:hover { filter: brightness(1.08); }
button:disabled { opacity: .5; cursor: default; }
input[type="number"], input[type="text"], select, textarea { font: inherit; font-size: .92rem; padding: .3rem .45rem; border-radius: 6px; border: 1px solid var(--line-2); background: var(--surface); color: var(--ink); }
input[type="number"] { width: 4.5rem; }
select, input[type="text"] { max-width: 100%; }
select { max-width: min(28rem, calc(100vw - 7rem)); }
.controls label { max-width: 100%; }
input[type="range"] { accent-color: var(--accent); }
textarea { width: 100%; font-family: var(--mono); min-height: 3.2rem; }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }
svg .hit:focus-visible { outline: none; }
svg .hit:focus-visible > circle, svg .hit:focus-visible > .edge-line, svg .hit:focus-visible > rect { stroke: var(--focus); stroke-width: 4; }

.status { display: flex; align-items: center; gap: .5rem; padding: .45rem .7rem; border-radius: 7px; background: var(--bg-2); border: 1px solid var(--line); margin: .5rem 0; font-size: .95rem; }
.status .icon { font-weight: 700; }
.status.ok { background: var(--ok-bg); color: var(--ok); border-color: transparent; }
.status.bad { background: var(--bad-bg); color: var(--bad); border-color: transparent; }
.status.warn { background: var(--warn-bg); color: var(--warn); border-color: transparent; }

svg.figure { display: block; width: 100%; height: auto; max-height: 72vh; background: var(--bg-2); border-radius: 8px; border: 1px solid var(--line); }
.figure-wrap { position: relative; }
.figure-caption { font-size: .85rem; color: var(--ink-2); margin: .3rem 0 0; }
details.twin { margin: .4rem 0; font-size: .85rem; }
details.twin summary { cursor: pointer; color: var(--ink-2); }
details.twin pre { white-space: pre-wrap; word-break: break-word; background: var(--bg-2); padding: .5rem; border-radius: 6px; margin: .3rem 0; }

svg .edge-hit { stroke: transparent; stroke-width: 14; fill: none; }
svg .edge-line { stroke: var(--edge); stroke-width: 2; fill: none; }
svg .edge.sel .edge-line { stroke: var(--accent); stroke-width: 4; }
svg .edge.ok .edge-line { stroke: var(--ok); stroke-width: 4; }
svg .edge.bad .edge-line { stroke: var(--bad); stroke-width: 4; stroke-dasharray: 6 4; }
svg .edge.hl .edge-line { stroke: var(--c1); stroke-width: 4; }
svg .edge.dim .edge-line { stroke: var(--edge-dim); }
svg .edge.faint .edge-line { stroke: var(--edge-dim); stroke-width: 1; }
svg .edge.nonedge .edge-line { stroke-dasharray: 5 4; }
svg .edge.nonedge.bad .edge-line { stroke: var(--bad); stroke-width: 3.5; stroke-dasharray: 5 3; }
svg .edge.cur .edge-line { stroke: var(--c1); stroke-width: 4; }
svg .edge.hidden { display: none; }
svg .arrowhead { fill: var(--edge); }
svg .vertex-circle { fill: var(--vertex); stroke: var(--vertex-stroke); stroke-width: 2; }
svg .vertex-label { fill: var(--ink); font: 600 12px var(--sans); pointer-events: none; }
svg .vertex-label.small { font-size: 9px; }
svg .vertex.sel .vertex-circle { fill: var(--accent); stroke: var(--accent-ink); }
svg .vertex.sel .vertex-label { fill: #fff; }
svg .vertex.ok .vertex-circle { fill: var(--ok); stroke: var(--ok); }
svg .vertex.ok .vertex-label { fill: #fff; }
svg .vertex.bad .vertex-circle { stroke: var(--bad); stroke-width: 4; }
svg .vertex.hl .vertex-circle { stroke: var(--c1); stroke-width: 4; }
svg .vertex.dim { opacity: .35; }
svg .edge.dim { opacity: .35; }
svg .vertex.cur .vertex-circle { stroke: var(--c1); stroke-width: 4; }
svg .vertex.c0 .vertex-circle { fill: var(--c0); } svg .vertex.c0 .vertex-label { fill: #fff; }
svg .vertex.c1 .vertex-circle { fill: var(--c1); } svg .vertex.c1 .vertex-label { fill: #fff; }
svg .vertex.c2 .vertex-circle { fill: var(--c2); } svg .vertex.c2 .vertex-label { fill: #fff; }
svg .vertex.c3 .vertex-circle { fill: var(--bad); } svg .vertex.c3 .vertex-label { fill: #fff; }
svg .vertex.c0 .vertex-circle { stroke-dasharray: none; }
svg .vertex.c1 .vertex-circle { stroke-dasharray: 4 3; }
svg .vertex.c2 .vertex-circle { stroke-dasharray: 1.5 3; }
svg .hit { cursor: pointer; }
svg text.note { fill: var(--ink-2); font: 12px var(--sans); }
svg text.note.strong { fill: var(--ink); font-weight: 600; }
svg .region { fill: none; stroke: var(--line-2); stroke-dasharray: 4 4; rx: 8; }
svg .region.hl { stroke: var(--c1); stroke-width: 2; }
svg .region-label { fill: var(--ink-3); font: 11px var(--sans); }
svg .edge-label { fill: var(--ink-2); font: 10px var(--sans); text-anchor: middle; pointer-events: none; }

.clauses { display: flex; flex-direction: column; gap: .3rem; }
.clause { display: flex; flex-wrap: wrap; align-items: center; gap: .25rem; padding: .3rem .5rem; border-radius: 7px; background: var(--bg-2); border: 1px solid var(--line); font-family: var(--mono); font-size: .95rem; }
.clause .clause-index { color: var(--ink-3); font-size: .8rem; margin-inline-end: .3rem; min-width: 1.6rem; }
.clause .paren, .clause .or { color: var(--ink-3); }
.clause .lit { padding: .05rem .35rem; border-radius: 5px; border: 1px solid transparent; }
.clause .lit.clickable { cursor: pointer; border-color: var(--line-2); }
.clause .lit.true { background: var(--ok-bg); color: var(--ok); font-weight: 600; }
.clause .lit.false { background: var(--bad-bg); color: var(--bad); text-decoration: line-through; }
.clause .lit.hl { outline: 2px solid var(--c1); }
.clause.sat { border-color: var(--ok); }
.clause.unsat { border-color: var(--bad); background: var(--bad-bg); }
.clause.hl { outline: 2px solid var(--c1); }
.clause .clause-state { margin-inline-start: auto; font-family: var(--sans); font-size: .8rem; color: var(--ink-2); }
.clause.sat .clause-state { color: var(--ok); } .clause.unsat .clause-state { color: var(--bad); }
.variables { display: flex; flex-wrap: wrap; gap: .4rem; margin: .4rem 0; }
.variables .var { display: inline-flex; gap: .4rem; align-items: center; font-family: var(--mono); padding: .25rem .6rem; }
.variables .var .var-val { font-weight: 700; min-width: 1ch; color: var(--ink-3); }
.variables .var.t { background: var(--ok-bg); border-color: var(--ok); } .variables .var.t .var-val { color: var(--ok); }
.variables .var.f { background: var(--bad-bg); border-color: var(--bad); } .variables .var.f .var-val { color: var(--bad); }
.variables .var.hl { outline: 2px solid var(--c1); }

.answer { margin: .6rem 0; }
.answer .strip { display: flex; flex-wrap: wrap; gap: 2px; }
.answer .strip .bit { display: inline-flex; flex-direction: column; align-items: center; width: 1.45rem; min-height: 2rem; border: 1px solid var(--line-2); border-radius: 4px; font-family: var(--mono); font-size: .8rem; background: var(--surface); }
.answer .strip .bit .b { font-weight: 700; line-height: 1.3; }
.answer .strip .bit .i { font-size: .6rem; color: var(--ink-3); line-height: 1.1; }
.answer .strip .bit.one { background: var(--accent); border-color: var(--accent); color: #fff; }
.answer .strip .bit.one .i { color: #e5efff; }
.answer .strip .gap { width: .5rem; }
.answer .decimal { margin-top: .4rem; font-family: var(--mono); font-size: 1.05rem; word-break: break-all; }
.answer .decimal .label { font-family: var(--sans); color: var(--ink-2); font-size: .85rem; margin-inline-end: .4rem; }
.answer .legend { font-size: .8rem; color: var(--ink-2); }

.player { display: flex; flex-wrap: wrap; gap: .5rem .8rem; align-items: center; margin: .5rem 0; }
.player .counter { font-family: var(--mono); font-weight: 700; padding: .2rem .55rem; background: var(--bg-2); border-radius: 6px; border: 1px solid var(--line); }
.player .msg { flex-basis: 100%; min-height: 1.4rem; color: var(--ink-2); font-size: .92rem; }
svg.tree { background: var(--bg-2); border-radius: 8px; border: 1px solid var(--line); width: 100%; height: auto; display: block; }
svg.tree line { stroke: var(--line-2); stroke-width: 1; }
svg.tree circle { fill: var(--ink-3); }
svg.tree circle.sat { fill: var(--ok); } svg.tree circle.prune, svg.tree circle.conflict, svg.tree circle.skip { fill: var(--bad); }
svg.tree circle.cur { stroke: var(--c1); stroke-width: 3; }
svg.tree circle.backtrack { fill: var(--line-2); }

svg .bar { fill: var(--bg-3); stroke: var(--line-2); }
svg .bar.sel { fill: var(--accent); stroke: var(--accent-ink); }
svg .bar.hl { stroke: var(--c1); stroke-width: 3; }
svg .bar.dim { opacity: .35; }
svg text.bar-label { fill: var(--ink); font: 12px var(--mono); }
svg .total { fill: var(--accent); }
svg .total.over { fill: var(--bad); } svg .total.exact { fill: var(--ok); }
svg .target-line { stroke: var(--ink); stroke-width: 2; stroke-dasharray: 5 3; }

svg .cell { fill: var(--bg-3); stroke: var(--line); }
svg .cell.on { fill: var(--ink-3); }
svg .cell.on.sel { fill: var(--accent); }
svg .cell.bad { fill: var(--bad); }
svg .row-bg { fill: transparent; }
svg .row-bg.sel { fill: var(--accent-bg); }
svg .row-bg.hl { fill: var(--warn-bg); }
svg .row-bg.dim { opacity: .3; }
svg .col-bg { fill: transparent; }
svg .col-bg.hl { fill: var(--warn-bg); }
svg .col-bg.ok { fill: var(--ok-bg); }
svg .col-bg.bad { fill: var(--bad-bg); }
svg text.grid-label { fill: var(--ink-2); font: 10px var(--mono); }
svg text.grid-label.hl { fill: var(--c1); font-weight: 700; }
svg text.digit { fill: var(--ink); font: 13px var(--mono); text-anchor: middle; }
svg text.digit.zero { fill: var(--ink-3); }
svg text.digit.hl { fill: var(--c1); font-weight: 700; }

table.plain { border-collapse: collapse; font-size: .9rem; }
table.plain td, table.plain th { border: 1px solid var(--line); padding: .25rem .5rem; text-align: start; }
.index-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: .8rem; }
.card { display: block; padding: .8rem 1rem; border: 1px solid var(--line); border-radius: 10px; background: var(--surface); text-decoration: none; color: var(--ink); }
.card:hover { border-color: var(--accent); }
.card .t { font-weight: 700; } .card .d { color: var(--ink-2); font-size: .9rem; }
.card .n { color: var(--ink-3); font-size: .8rem; }
.explain { font-size: .92rem; color: var(--ink-2); max-width: 80ch; }
.explain b { color: var(--ink); }
kbd { font-family: var(--mono); font-size: .85em; border: 1px solid var(--line-2); border-radius: 4px; padding: 0 .3em; background: var(--bg-2); }
.vis-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

@media (prefers-reduced-motion: no-preference) {
  svg .vertex-circle, svg .edge-line, .clause, .var { transition: fill .2s, stroke .2s, background-color .2s, border-color .2s; }
}
@media (max-width: 480px) {
  body { font-size: 15px; }
  main { padding: .7rem 16px 2rem; }
  section.panel { padding: .75rem; }
  .answer .strip .bit { width: 1.25rem; }
}

.internal-banner { position: sticky; top: 0; z-index: 10; background: repeating-linear-gradient(135deg, #b3261e 0 14px, #8f1d17 14px 28px); color: #fff; font: 700 .95rem/1.3 var(--sans); letter-spacing: .02em; padding: .45rem 16px; text-align: center; }
.internal-banner small { font-weight: 400; letter-spacing: 0; opacity: .92; }
pre.file { font-family: var(--mono); font-size: .85rem; line-height: 1.45; background: var(--bg-2); border: 1px solid var(--line); border-radius: 8px; padding: .6rem .8rem; margin: .4rem 0; overflow-x: auto; max-width: 100%; }
pre.file .fixed-line { background: var(--warn-bg); color: var(--warn); border-radius: 3px; }
.worked { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.5fr); gap: .6rem 1.5rem; align-items: start; }
@media (max-width: 760px) { .worked { grid-template-columns: minmax(0, 1fr); } }
.worked dl { margin: 0; font-size: .95rem; }
.worked dt { color: var(--ink-2); font-size: .85rem; margin-top: .5rem; }
.worked dd { margin: .1rem 0 0; }
.worked dd code { font-size: 1.05rem; white-space: pre-wrap; }
.view svg.figure { max-width: 480px; margin: 0 auto; }
.worked dd .num { font: 700 1.35rem var(--mono); color: var(--accent-ink); }
.rules { margin: .6rem 0 0; padding-inline-start: 1.2rem; color: var(--ink-2); font-size: .92rem; }
.rules li { margin: .15rem 0; }
.checker-form { display: grid; gap: .5rem; }
.checker-form textarea { min-height: 11rem; font-size: .85rem; resize: vertical; }
.checker-form .row { display: flex; flex-wrap: wrap; gap: .5rem; align-items: center; }
.checker-form input.answer-in { font-family: var(--mono); flex: 1 1 14rem; min-width: 0; font-size: 1rem; padding: .4rem .55rem; }
.verdict { font-size: 1.05rem; }
.verdict .word { font: 700 1.2rem var(--mono); margin-inline-end: .4rem; }
.verdict.error { background: var(--warn-bg); color: var(--warn); border-color: transparent; }
.verdict-detail { font-size: .85rem; color: var(--ink-2); margin: .2rem 0 0; word-break: break-word; }
table.downloads { border-collapse: collapse; font-size: .85rem; width: 100%; }
table.downloads td, table.downloads th { border-bottom: 1px solid var(--line); padding: .25rem .4rem; text-align: start; }
table.downloads td.soon { color: var(--ink-3); }
.table-scroll { overflow-x: auto; max-width: 100%; }
.legend-row { display: flex; flex-wrap: wrap; gap: .4rem 1rem; font-size: .85rem; color: var(--ink-2); margin: .3rem 0; }
.swatch { display: inline-block; width: .9rem; height: .9rem; border-radius: 50%; vertical-align: -0.12rem; margin-inline-end: .3rem; border: 2px solid var(--vertex-stroke); }
.swatch.c0 { background: var(--c0); } .swatch.c1 { background: var(--c1); border-style: dashed; } .swatch.c2 { background: var(--c2); border-style: dotted; }
svg .vertex.locked .vertex-circle { stroke: var(--ink); stroke-width: 3.5; }
svg .lock-badge { fill: var(--surface); stroke: var(--ink); stroke-width: 1.5; }
svg text.lock-text { fill: var(--ink); font: 700 9px var(--sans); pointer-events: none; }
svg .edge.fixed-edge .edge-line { stroke: var(--ink); stroke-width: 3.5; }
.answer .strip .bit.just { box-shadow: 0 0 0 2px var(--focus); }
.subnav { display: flex; flex-wrap: wrap; gap: .3rem .9rem; font-size: .9rem; margin: .2rem 0 .6rem; }
.subnav a { color: var(--ink-2); }
svg text.edge-label.weight { font: 600 12px var(--sans); fill: var(--ink); paint-order: stroke; stroke: var(--bg-2); stroke-width: 4px; }
svg text.tag { paint-order: stroke; stroke: var(--bg-2); stroke-width: 4px; stroke-linejoin: round; }
.variables .var.static { cursor: default; pointer-events: none; }

a.btn { display: inline-block; text-decoration: none; color: var(--ink); }
a.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.answer .strip.clickable .bit { cursor: pointer; padding: 0; font: inherit; font-family: var(--mono); font-size: .8rem; color: var(--ink); }
.answer .strip.clickable .bit:hover { border-color: var(--accent); background: var(--accent-bg); }
.answer .strip.clickable .bit.one:hover { background: var(--accent-ink); }
.answer .strip.clickable .bit.one { color: #fff; }
.answer .strip .bit.hl { outline: 2px solid var(--c1); }
.answer .strip .bit.open .b { color: var(--ink-3); font-weight: 400; }
.answer .strip.dense .bit { width: 1.6rem; }
.answer .strip.dense .bit .i { font-size: .55rem; }
@media (max-width: 480px) { .answer .strip.dense .bit { width: 1.45rem; } }
.worked.stack { grid-template-columns: minmax(0, 1fr); }
.stack-col { display: grid; grid-template-columns: minmax(0, 1fr); gap: .6rem; }
.worked dd code.bits-text { font-size: .9rem; word-break: break-all; white-space: normal; }
.worked dd .num { word-break: break-all; }
pre.file.long { max-height: 18rem; overflow: auto; }
details.file-fold { margin: .3rem 0 .6rem; font-size: .9rem; }
details.file-fold summary { cursor: pointer; color: var(--ink-2); }
.file-head { margin-bottom: .1rem; }
.check-steps { margin: .3rem 0 .4rem; padding-inline-start: 1.4rem; font-size: .95rem; }
.check-steps li { margin: .2rem 0; }
.found { font-family: var(--mono); font-size: .9rem; word-break: break-all; color: var(--ok); min-height: 1.2rem; margin: .2rem 0; }
.hint { min-height: 1.2rem; margin: .2rem 0; }
svg .edge text.tour-only { display: none; }
svg .edge.show text.tour-only { display: inline; }
.variables.compact { gap: .2rem; }
.variables.compact .var { padding: .05rem .3rem; font-size: .75rem; gap: .2rem; }
.clause-list { margin: .3rem 0; }
.clause-head { display: flex; flex-wrap: wrap; gap: .4rem .8rem; align-items: center; justify-content: space-between; margin-bottom: .3rem; font-size: .9rem; }
.clause-sum { font-weight: 600; } .clause-sum.ok { color: var(--ok); } .clause-sum.bad { color: var(--bad); }
.clause-box { position: relative; max-height: 22rem; overflow-y: auto; border: 1px solid var(--line); border-radius: 8px; background: var(--bg-2); padding: .35rem;
  display: grid; grid-template-columns: repeat(auto-fill, minmax(15.5rem, 1fr)); gap: .25rem; align-content: start; }
.clause-box .cl { display: flex; flex-wrap: wrap; align-items: center; gap: .15rem .2rem; padding: .15rem .3rem; border-radius: 5px; background: var(--surface); border: 1px solid var(--line); border-inline-start-width: 4px; font-family: var(--mono); font-size: .8rem; line-height: 1.35; }
.clause-box .cl[hidden] { display: none; }
.clause-box .cl .cl-i { color: var(--ink-3); font-size: .68rem; min-width: 2.1rem; }
.clause-box .cl .lit { font: inherit; padding: 0 .2rem; border-radius: 4px; border: 1px solid transparent; background: none; color: var(--ink); }
.clause-box .cl button.lit { cursor: pointer; border-color: var(--line); }
.clause-box .cl button.lit:hover { border-color: var(--accent); }
.clause-box .cl .lit.true { background: var(--ok-bg); color: var(--ok); font-weight: 700; }
.clause-box .cl .lit.false { color: var(--ink-3); text-decoration: line-through; }
.clause-box .cl .lit.hl { outline: 2px solid var(--c1); }
.clause-box .cl.sat { border-inline-start-color: var(--ok); }
.clause-box .cl.unsat { border-inline-start-color: var(--bad); background: var(--bad-bg); }
.clause-box .cl.open { border-inline-start-color: var(--line-2); }
.clause-box .cl.hl { outline: 2px solid var(--c1); }
.clause-box.ilp-rows { grid-template-columns: repeat(auto-fill, minmax(19rem, 1fr)); }
.clause-box .cl .ilp-rel { color: var(--ink-2); padding: 0 .2rem; }
.clause-box .cl .ilp-val { margin-inline-start: auto; color: var(--ink-3); font-family: var(--sans); font-size: .72rem; }
@media (max-width: 480px) { .clause-box { grid-template-columns: minmax(0, 1fr); max-height: 20rem; } }
.checker-form textarea.answer-in { min-height: 2.6rem; width: 100%; font-family: var(--mono); font-size: 1rem; word-break: break-all; }
svg.tree { max-height: 24rem; }
#problem { max-width: calc(100vw - 9rem); }

.view svg.figure.big { max-width: 100%; }
.item-strip { display: flex; flex-wrap: wrap; gap: 2px; margin: .3rem 0; }
.item-strip .item { width: 9px; height: 14px; border-radius: 2px; background: var(--bg-3); border: 1px solid var(--line); }
.item-strip .item.ok { background: var(--ok); border-color: var(--ok); }
.item-strip .item.bad { background: var(--bad); border-color: var(--bad); }
.item-strip .item.hl { outline: 2px solid var(--c1); }
.set-list { display: flex; flex-wrap: wrap; gap: .25rem; max-height: 26rem; overflow: auto; font: .78rem var(--mono); }
.set-chip { padding: .1rem .35rem; border: 1px solid var(--line); border-radius: 5px; background: var(--bg-2); white-space: nowrap; }
.set-chip.hit { cursor: pointer; }
.set-chip.sel { background: var(--accent-bg); border-color: var(--accent); color: var(--accent-ink); font-weight: 700; }
.set-chip.bad { border-color: var(--bad); color: var(--bad); }
.set-chip.dim { opacity: .35; }
.set-chip.cur { outline: 2px solid var(--c1); }
[dir=rtl] svg, [dir=rtl] .strip, [dir=rtl] .clauses, [dir=rtl] .clause-box, [dir=rtl] .variables, [dir=rtl] pre.file, [dir=rtl] .found, [dir=rtl] .answer-in, [dir=rtl] textarea { direction: ltr; }
[dir=rtl] code, [dir=rtl] .mono, [dir=rtl] kbd, [dir=rtl] .decimal .num, [dir=rtl] .counter, [dir=rtl] h1 .code { direction: ltr; unicode-bidi: isolate; }
[dir=rtl] .clause .clause-state { direction: rtl; unicode-bidi: isolate; }
[dir=rtl] svg.tree > text.note { direction: rtl; text-anchor: end; }