.explore-page{--cell:44px;max-width:680px;margin:0 auto;padding:28px 20px 80px}.explore-page .eyebrow{letter-spacing:.14em;color:var(--ink-soft);text-transform:uppercase;margin-bottom:10px;font-family:IBM Plex Mono,monospace;font-size:12px}.explore-page h1{margin-bottom:18px;font-family:Spectral,Noto Serif TC,serif;font-size:clamp(26px,6vw,34px);font-weight:700;line-height:1.3}.explore-page h2{align-items:baseline;gap:10px;margin:44px 0 12px;font-family:Spectral,Noto Serif TC,serif;font-size:20px;font-weight:700;display:flex}.explore-page h2 .no{color:var(--path);font-family:IBM Plex Mono,monospace;font-size:13px;font-weight:500}.explore-page p{margin-bottom:14px}.explore-page em{background:linear-gradient(transparent 62%, var(--hl) 62%, var(--hl) 94%, transparent 94%);padding:0 1px;font-style:normal}.explore-page .thm{border-left:3px solid var(--ink);background:#f4f1e8;margin:20px 0 8px;padding:14px 16px;font-size:16px}.explore-page .thm b{font-family:Spectral,serif}.explore-page .math{white-space:nowrap;font-family:Spectral,serif;font-style:italic}.explore-page .mono{font-family:IBM Plex Mono,monospace;font-size:.92em;font-style:normal}.explore-page .board{border:1.5px solid var(--ink);background:linear-gradient(var(--grid-blue) 1px, transparent 1px), linear-gradient(90deg, var(--grid-blue) 1px, transparent 1px);background-color:#fff;background-size:22px 22px;border-radius:6px;margin:22px 0 8px;padding:16px 12px 12px;overflow:hidden}.explore-page .controls{flex-wrap:wrap;gap:8px;margin-bottom:14px;display:flex}.explore-page .btn{border:1.5px solid var(--ink);color:var(--ink);cursor:pointer;background:#fff;border-radius:999px;padding:7px 15px;font-family:Noto Serif TC,serif;font-size:14.5px;transition:background .15s}.explore-page .btn:focus-visible{outline:3px solid var(--path);outline-offset:2px}.explore-page .btn.primary{background:var(--ink);color:#fff}.explore-page .btn.active-fail{background:var(--fail);border-color:var(--fail);color:#fff}.explore-page .btn.active-diag{background:var(--path);border-color:var(--path);color:#fff}.explore-page .gridwrap{width:calc(var(--cell)*7 + 26px);max-width:100%;margin:0 auto;position:relative}.explore-page .rowlabels{flex-direction:column;width:24px;display:flex;position:absolute;top:0;left:0}.explore-page .rowlabels span{height:var(--cell);color:var(--ink-soft);justify-content:center;align-items:center;font-family:IBM Plex Mono,monospace;font-size:10.5px;display:flex}.explore-page .grid{grid-template-columns:repeat(7,var(--cell));grid-auto-rows:var(--cell);margin-left:26px;display:grid;position:relative}.explore-page .cell{border:1px solid var(--grid-blue);background:#fff;justify-content:center;align-items:center;font-family:IBM Plex Mono,monospace;display:flex;position:relative}.explore-page .cell .lbl{color:#b9c4d0;font-size:10px;position:absolute;top:2px;left:3px}.explore-page .cell .num{color:var(--ink);opacity:0;font-size:15px;font-weight:500;transition:opacity .18s,transform .18s;transform:scale(.6)}.explore-page .cell.visited{background:var(--hl)}.explore-page .cell.visited .num{opacity:1;transform:scale(1)}.explore-page .cell.visited .lbl{color:var(--ink-soft)}.explore-page .cell.now{box-shadow:inset 0 0 0 2.5px var(--path)}.explore-page .cell.now-fail{box-shadow:inset 0 0 0 2.5px var(--fail)}.explore-page svg.path{pointer-events:none;width:100%;height:100%;position:absolute;inset:0;overflow:visible}.explore-page svg.path polyline{fill:none;stroke:var(--path);stroke-width:2.5px;stroke-linejoin:round;stroke-linecap:round;opacity:.85}.explore-page svg.path.fail polyline{stroke:var(--fail)}.explore-page .dots{text-align:center;color:var(--ink-soft);letter-spacing:.4em;margin:4px 0 0 26px;font-family:IBM Plex Mono,monospace;font-size:13px}.explore-page .status{text-align:center;max-width:420px;min-height:52px;color:var(--ink);margin:14px auto 2px;font-size:15px;line-height:1.6}.explore-page .status .warn{color:var(--fail);font-weight:600}.explore-page .status .ok{color:var(--path);font-weight:600}.explore-page .caption{color:var(--ink-soft);margin-top:6px;font-size:13.5px;line-height:1.7}.explore-page .steps{counter-reset:st;margin:14px 0}.explore-page .step{border-left:1.5px dashed var(--grid-blue);margin-left:13px;padding:0 0 18px 40px;position:relative}.explore-page .step:last-child{border-left-color:#0000;padding-bottom:0}.explore-page .step:before{counter-increment:st;content:counter(st);background:var(--paper);border:1.5px solid var(--ink);border-radius:50%;justify-content:center;align-items:center;width:27px;height:27px;font-family:IBM Plex Mono,monospace;font-size:13px;display:flex;position:absolute;top:0;left:-14px}.explore-page details{border:1.5px solid var(--grid-blue);background:#fff;border-radius:6px;margin-top:34px;padding:0}.explore-page summary{cursor:pointer;padding:13px 16px;font-family:Noto Serif TC,serif;font-weight:600;list-style:none}.explore-page summary:before{content:"§ ";color:var(--path);font-family:Spectral,serif}.explore-page details[open] summary{border-bottom:1.5px solid var(--grid-blue)}.explore-page details .inner{padding:14px 16px 6px}.explore-page .foot{border-top:1.5px solid var(--grid-blue);color:var(--ink-soft);margin-top:52px;padding-top:16px;font-family:IBM Plex Mono,monospace;font-size:13px}@media (width<=390px){.explore-page{--cell:40px}}@media (prefers-reduced-motion:reduce){.explore-page .cell .num{transition:none}}.explore-page .back-link{margin:28px 0 0;font-family:IBM Plex Mono,monospace;font-size:13px;display:block}