:root{--bg:#F6F5F1;--panel:#FFFFFF;--line:#C7D1DC;--line-strong:#8FA1B3;--ink:#22303F;--fill:#2B3D52;--muted:#7A8694;--mark:#9AA7B4;--accent:#B5472F;--gold:#C9A227;--silver-c:#8E9BA8;--bronze:#A87344;--hover:#EDF1F5;--cell-bg:#FBFCFD;--cell:clamp(18px, calc(72vmin / var(--n, 15)), 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i.fill{background:var(--fill)}.lesson-line i.mark::after{content:"×";position:absolute;inset:0;display:grid;place-items:center;color:var(--mark);font-size:1.15rem;font-style:normal}.lesson-line-row{display:grid;grid-template-columns:4.5rem auto;align-items:center;gap:.5rem;font-size:.72rem;text-align:right}.lesson-line-row.certain{color:var(--ink);font-weight:700}.lesson-nuri-grid{display:grid;grid-template-columns:repeat(5,1fr);width:9.5rem;aspect-ratio:1;border:2px solid var(--line-strong);background:var(--cell-bg)}.lesson-nuri-grid i{display:grid;place-items:center;border-right:1px solid var(--line);border-bottom:1px solid var(--line);color:var(--ink);font:700 .78rem ui-monospace,sf mono,Menlo,monospace;font-style:normal}.lesson-nuri-grid i.water{background:var(--fill)}.lesson-nuri-grid i.clue{background:color-mix(in srgb,var(--gold) 13%,var(--cell-bg));box-shadow:inset 0 0 0 1px color-mix(in srgb,var(--gold) 55%,transparent)}.lesson-nuri-grid.mini{width:7rem}.lesson-nuri-grid.mini.three{grid-template-columns:repeat(3,1fr)}.lesson-nuri-grid.mini.two{grid-template-columns:repeat(2,1fr)}.lesson-nuri-grid i.forced{color:var(--gold);font-size:1.2rem}.nuri-example-figure{width:100%}.prose{max-width:42rem;width:100%;display:flex;flex-direction:column;gap:.9rem}.prose h1{text-align:left}.prose h2,.prose h3{font-family:iowan old style,palatino linotype,Palatino,Georgia,serif;font-weight:600;margin-top:.8rem}.prose ul,.prose ol{padding-left:1.3rem;display:flex;flex-direction:column;gap:.3rem}.prose code{font-family:ui-monospace,sf mono,Menlo,Consolas,monospace;font-size:.9em;background:var(--hover);border:1px solid var(--line);border-radius:4px;padding:0 .3em}.puzzle-list{list-style:none;display:flex;flex-direction:column;gap:.4rem}.puzzle-list li{display:flex;gap:.8rem;align-items:baseline}.puzzle-list .meta{color:var(--muted);font-size:.85rem}.puzzle-list li.done a{color:var(--muted)}.nurikabe-page,#nurikabe{width:100%;display:flex;flex-direction:column;align-items:center;gap:1.1rem}.nurikabe-page{max-width:44rem;gap:2.6rem}.nuri-campaign-head{gap:.45rem}.eyebrow{color:var(--accent);font-size:.75rem;font-weight:750;letter-spacing:.12em;text-transform:uppercase}.nuri-chart{width:100%;align-items:stretch;gap:.9rem;padding:clamp(.8rem,3vw,1.35rem);border:1px solid var(--line);border-radius:12px;background:radial-gradient(circle at 18% 22%,color-mix(in srgb,var(--gold) 8%,transparent) 0 2px,transparent 3px),radial-gradient(circle at 76% 68%,color-mix(in srgb,var(--accent) 8%,transparent) 0 2px,transparent 3px),var(--panel);background-size:64px 64px,91px 91px,auto}.nuri-chart-head{display:flex;justify-content:space-between;align-items:end;gap:1rem}.nuri-chart h2,.nuri-puzzle-title{font-family:iowan old style,palatino linotype,Palatino,Georgia,serif;font-size:1.45rem;font-weight:600}.nuri-puzzle-title .dim{color:var(--muted);font-weight:400}.nuri-progress{color:var(--muted);font-size:.9rem}.nuri-milestone{color:var(--accent);font-size:.85rem;text-align:right}.nuri-map{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:clamp(5px,1.5vw,9px)}.nuri-map-tile{--region-c:var(--bronze);position:relative;display:grid;place-items:center;min-width:0;aspect-ratio:1;border:1px dashed color-mix(in srgb,var(--region-c) 70%,var(--line));border-radius:42% 52% 45% 55%;background:color-mix(in srgb,var(--region-c) 5%,var(--cell-bg));color:var(--muted);text-decoration:none;transition:transform 120ms ease,border-color 120ms ease}.nuri-map-tile:nth-child(3n){border-radius:55% 40% 52% 44%}.nuri-map-tile:nth-child(4n){border-radius:43% 56% 39% 58%}.nuri-map-tile:hover,.nuri-map-tile:focus-visible{z-index:1;transform:translateY(-2px);border-color:var(--region-c)}.nuri-map-tile.region-open-sea{--region-c:var(--silver-c)}.nuri-map-tile.region-deep-water{--region-c:var(--gold)}.map-number{font:700 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.region-deep-water::before{color:var(--gold)}.nuri-puzzle{width:100%;scroll-margin-top:1rem}.nuri-puzzle>.breadcrumbs{align-self:flex-start}.nuri-pager{width:min(100%,30rem)}.nuri-board-wrap{overflow:visible}.nuri-stamp div{max-width:80%;border-color:var(--gold);color:var(--gold);text-align:center;line-height:1.1}.nuri-win-panel{width:min(100%,30rem);padding:1rem;border:1px solid var(--gold);border-radius:8px;background:color-mix(in srgb,var(--gold) 8%,var(--panel));color:var(--muted);text-align:center}.nuri-win-panel b{color:var(--ink)}.nuri-tools{display:inline-grid;grid-template-columns:1fr 1fr;border:1px solid var(--line-strong);border-radius:6px;overflow:hidden}.nuri-tool{display:flex;align-items:center;gap:.45rem;border:0;border-radius:0;padding:.45rem .8rem}.nuri-tool+.nuri-tool{border-left:1px solid var(--line-strong)}.nuri-tool.active{background:var(--hover);box-shadow:inset 0 -2px var(--accent)}.tool-swatch{width:.85rem;height:.85rem;border:1px solid var(--line-strong)}.tool-swatch.water{background:var(--fill)}.tool-swatch.land{background:var(--cell-bg)}.nuri-board{--nuri-cell:clamp(42px, calc(76vmin / var(--nuri-n)), 64px);display:grid;grid-template-columns:repeat(var(--nuri-n),var(--nuri-cell));grid-template-rows:repeat(var(--nuri-n),var(--nuri-cell));border:2px solid var(--line-strong);background:var(--cell-bg);box-shadow:0 3px 12px color-mix(in srgb,var(--ink) 10%,transparent);touch-action:none;user-select:none}.nuri-cell{position:relative;width:var(--nuri-cell);height:var(--nuri-cell);padding:0;border:0;border-right:1px solid var(--line);border-bottom:1px solid var(--line);border-radius:0;background:var(--cell-bg);color:var(--ink);font-family:ui-monospace,sf mono,Menlo,Consolas,monospace;font-size:1.05rem;font-weight:700}.nuri-cell:hover{background:var(--hover)}.nuri-cell.water,.nuri-cell.water:hover{background:var(--fill)}.nuri-cell.land,.nuri-cell.land:hover{background:var(--cell-bg)}.nuri-cell.land:not(.clue)::after{content:"";position:absolute;width:.38rem;height:.38rem;top:50%;left:50%;border-radius:50%;background:var(--gold);transform:translate(-50%,-50%)}#nurikabe.won .nuri-cell.land:not(.clue)::after{display:none}.nuri-cell.clue{opacity:1;cursor:default;background:color-mix(in srgb,var(--gold) 13%,var(--cell-bg));box-shadow:inset 0 0 0 2px color-mix(in srgb,var(--gold) 55%,transparent)}#nurikabe .win-panel{display:none}#nurikabe.won .win-panel{display:block}#nurikabe.won .nuri-board{border-color:var(--gold)}@media(max-width:520px){.nuri-chart-head{align-items:start;flex-direction:column;gap:.25rem}.nuri-milestone{text-align:left}.nuri-map{gap:5px}}