header{padding-bottom:22px;border-bottom:1px solid var(--line)}.rules-essay main{display:block;padding-top:68px}.rules-essay .rules-article{max-width:none}.rules-article__header{max-width:880px;margin:0 auto 56px;padding:0;border:0;text-align:center}.rules-article__header h1{font-size:clamp(48px,7vw,76px);font-style:normal;line-height:1.05}.rules-article__header .dek{max-width:760px;margin:24px auto 22px}.rules-article__meta{margin-bottom:18px;color:var(--muted);font-size:13px}.rules-article__links{color:var(--muted);font-size:14px}.rules-article__links span{padding:0 7px}.rules-opening,.rules-article>p:not(.rules-closing){max-width:760px;margin-left:auto;margin-right:auto}.rules-opening{font-family:Georgia,Times New Roman,serif;font-size:21px;line-height:1.6}.rules-story{display:grid;grid-template-columns:minmax(0,1.02fr) minmax(0,.98fr);gap:clamp(48px,7vw,92px);align-items:start;margin:110px 0 90px}.rules-story__visual{position:sticky;top:34px;align-self:start;min-width:0}.rules-story__visual figure{margin:0}.rules-story__stage{position:relative;width:min(100%,560px);margin:0 auto;aspect-ratio:6 / 7}.rules-story__board,.rules-story__photo{position:absolute;inset:0;display:block;width:100%;height:100%;transition:opacity .24s ease}.rules-story__board{opacity:1}.rules-story__photo{object-fit:contain;opacity:0}.rules-story__stage[data-scene=chain] .rules-story__board{opacity:0}.rules-story__stage[data-scene=chain] .rules-story__photo,.rules-story__stage[data-scene=chain] .rules-story__chain-markers{opacity:1}.rules-story__stage.is-changing .rules-story__board,.rules-story__stage.is-changing .rules-story__photo,.rules-story__stage.is-changing .rules-story__chain-markers{opacity:0}.rules-story__chain-markers{position:absolute;inset:0;opacity:0;transition:opacity .24s ease}.rules-story__visual figcaption{max-width:480px;min-height:42px;margin:8px auto 0;color:var(--muted);font-size:13px;line-height:1.45;text-align:center}.rules-story__step{min-height:78vh;display:flex;flex-direction:column;justify-content:center;opacity:.42;transition:opacity .22s ease}.rules-story__step.is-active{opacity:1}.rules-story__step--short{min-height:48vh}.rules-story__step h2,.rules-story__step h3{margin-top:0}.rules-story__step h2{font-size:clamp(32px,3.4vw,45px)}.rules-story__step h3{font-size:29px}.rules-story__step p{font-size:18px;line-height:1.65}.rules-story__number{margin-bottom:16px;color:var(--red);font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:12px!important;font-weight:700}.rules-story__stage .chain-marker--start{left:58.8%;top:45.5%}.rules-story__stage .chain-marker--1{left:61.8%;top:51.2%}.rules-story__stage .chain-marker--2{left:55.9%;top:62.3%}.rules-story__stage .chain-marker--3{left:49.8%;top:73.7%}.rules-story__stage .chain-marker--4{left:43.8%;top:85.2%}.rules-section{max-width:760px;margin:100px auto 0}.rules-section h2{margin-bottom:24px;font-size:40px}.rules-section h3{margin-top:34px}.rules-section p{line-height:1.68}.rules-faq h3{font-size:21px;font-weight:700}.rules-notes,.rules-sources{color:var(--muted)}.rules-sources{font-size:14px}.rules-closing{max-width:760px;margin:100px auto 20px;font-family:Georgia,Times New Roman,serif;font-size:22px;line-height:1.6}@media(max-width:820px){.rules-page,.rules-essay{overflow-x:clip}.rules-essay main{padding-top:42px}.rules-story{grid-template-columns:1fr;gap:0;margin-top:80px}.rules-story__visual,.rules-story__copy{grid-area:1 / 1}.rules-story__visual{top:0;z-index:3;padding:8px 0 6px;background:var(--paper)}.rules-story__stage{width:min(100%,300px);height:min(35vh,350px);aspect-ratio:auto}.rules-story__visual figcaption{min-height:36px;margin-top:2px;padding:0 12px;font-size:12px}.rules-story__step,.rules-story__step--short{min-height:100vh;justify-content:flex-start;padding:calc(min(35vh,350px) + 96px) 0 88px;opacity:1}.rules-story__step h2{font-size:36px}.rules-story__step h3{font-size:27px}}@media(max-width:520px){.rules-article__header{margin-bottom:40px}.rules-article__header h1{font-size:46px}.rules-article__header .dek,.rules-opening{font-size:18px}.rules-story__stage{width:min(100%,250px);height:29vh;min-height:236px}.rules-story__step,.rules-story__step--short{min-height:100vh;padding-top:calc(max(29vh,236px) + 88px)}.rules-story__step p{font-size:17px}.rules-section{margin-top:76px}.rules-section h2{font-size:34px}}@media(prefers-reduced-motion:reduce){.rules-story__board,.rules-story__photo,.rules-story__chain-markers,.rules-story__step{transition:none}}main{display:grid;grid-template-columns:minmax(0,1fr) 280px;gap:48px;padding-top:54px}main:not(:has(>aside)){grid-template-columns:minmax(0,720px);justify-content:center}article{max-width:720px}.eyebrow{margin:0 0 14px;color:var(--red);font-size:13px;font-weight:700;letter-spacing:0;text-transform:uppercase}h1{margin:0;font-family:Georgia,Times New Roman,serif;font-size:clamp(44px,7vw,82px);font-weight:400;font-style:italic;letter-spacing:0;line-height:.95}.dek{margin:24px 0 38px;color:var(--muted);font-size:clamp(19px,2.4vw,24px);line-height:1.45}.lede{color:var(--muted);font-size:19px;line-height:1.55}h2{margin:44px 0 14px;font-family:Georgia,Times New Roman,serif;font-size:32px;font-weight:400;line-height:1.15}h3{margin:22px 0 8px;font-family:Georgia,Times New Roman,serif;font-size:23px;font-weight:400;line-height:1.2}p{margin:0 0 18px;font-size:17px}ul{margin:14px 0 22px;padding-left:22px}li{margin:10px 0;font-size:17px}code,pre{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace}code{font-size:.92em;background:#15140f0f;padding:.1em .3em}pre{overflow-x:auto;margin:22px 0;padding:18px;background:#fdfcf7c7;border:1px solid var(--line);font-size:14px;line-height:1.55}table{width:100%;border-collapse:collapse;margin:22px 0;font-size:14px;background:#fdfcf7b8;border:1px solid var(--line)}th,td{padding:10px 12px;border-bottom:1px solid var(--line-soft);text-align:left;vertical-align:top}th{color:var(--muted);font-size:12px;text-transform:uppercase;letter-spacing:0;font-weight:700}tr:last-child td{border-bottom:0}.callout{margin:34px 0;padding:22px;background:#ffffff7a;border:1px solid var(--line)}.flow{display:grid;gap:10px;margin:28px 0;padding:18px;background:#fdfcf7c2;border:1px solid var(--line)}.flow-row{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:10px;align-items:stretch}.flow-node{min-height:86px;display:grid;place-items:center;padding:12px;border:1px solid var(--line);background:#f6f4eea3;text-align:center;font-size:13px;font-weight:700;line-height:1.25}.flow-caption{margin:0;color:var(--muted);font-size:13px}.quote{margin:30px 0;padding-left:20px;border-left:3px solid var(--gold);color:var(--muted);font-size:18px}.section-kicker,.figure-label{color:var(--red);font-size:12px;font-weight:700;letter-spacing:0;text-transform:uppercase}.game-case h2{margin-top:8px}.strategy-pair p,.practice-drills p{margin:0;color:var(--muted);font-size:14px;line-height:1.5}.practice-drills{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));margin:28px 0 38px;border-top:1px solid var(--line);border-left:1px solid var(--line)}.practice-drills>div{min-height:132px;padding:20px;border-right:1px solid var(--line);border-bottom:1px solid var(--line)}.practice-drills strong{display:block;margin-bottom:8px}.guide-game-shot{margin:38px 0 48px}.guide-game-shot--hero{margin-top:42px}.guide-game-shot img{display:block;width:100%;height:auto;aspect-ratio:958 / 863;object-fit:cover;border:1px solid var(--line);background:#f9f8f3}.chain-marker{position:absolute;display:grid;width:26px;height:26px;place-items:center;border:2px solid #fff;border-radius:50%;background:var(--red);box-shadow:0 1px 5px #15140f47;color:#fff;font-size:12px;font-weight:700;transform:translate(-50%,-50%)}.chain-marker--start{width:auto;padding:0 8px;border-radius:3px;background:#15140f;left:58.8%;top:45.5%}.chain-marker--1{left:61.8%;top:51.2%}.chain-marker--2{left:55.9%;top:62.3%}.chain-marker--3{left:49.8%;top:73.7%}.chain-marker--4{left:43.8%;top:85.2%}.guide-game-shot figcaption{display:grid;grid-template-columns:118px minmax(0,1fr);gap:18px;margin-top:0;padding:18px 0 0;border-top:1px solid var(--line-soft)}.guide-game-shot figcaption strong{display:inline}.setup-board{display:block;width:100%;aspect-ratio:6 / 7;border:1px solid var(--line-soft);background:#fdfcf7b8}.setup-piece{stroke:#fdfcf7;stroke-width:2}.setup-piece--0{fill:#15140f}.setup-piece--1{fill:#1d6f84}.setup-piece--2{fill:#d18a22}.setup-piece--3{fill:#a83321}.setup-piece--4{fill:#5c7444}.setup-piece--5{fill:#7a587c}.rule-goal-zone{stroke-width:2}.rule-goal-zone--home{fill:#15140f0e;stroke:#15140f2e}.rule-goal-zone--finish{fill:#a8332112;stroke:#a8332157}.rule-target-label{fill:var(--red);font-size:11px;font-weight:700;pointer-events:none}.finish-label{fill:var(--red);font-size:14px;font-weight:700;text-transform:uppercase}.faq-list{margin:24px 0 42px;border-top:1px solid var(--line)}.faq-list details{border-bottom:1px solid var(--line)}.faq-list summary{padding:18px 34px 18px 0;font-size:17px;font-weight:700;cursor:pointer}.faq-list details p{max-width:620px;padding:0 34px 8px 0;color:var(--muted)}.source-intro,.source-list{color:var(--muted)}.source-list a{color:var(--ink);font-weight:600}.game-case{margin:48px 0;padding:28px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.game-case__facts{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));margin-top:26px;border-top:1px solid var(--line-soft)}.game-case__facts div{padding:18px 14px 0 0}.game-case__facts strong,.game-case__facts span{display:block}.game-case__facts strong{font-family:Georgia,Times New Roman,serif;font-size:34px;font-weight:400}.game-case__facts span{color:var(--muted);font-size:13px}.decision-test,.endgame-checklist{margin:28px 0 38px;padding:22px 24px;border-left:3px solid var(--red);background:#fdfcf7b8}.decision-test ol,.endgame-checklist ul{margin-bottom:0}.strategy-pair{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));margin:28px 0 44px;border-top:1px solid var(--line);border-left:1px solid var(--line)}.strategy-pair>div{padding:22px;border-right:1px solid var(--line);border-bottom:1px solid var(--line)}.strategy-pair h3{margin-top:7px}.rule-diagrams{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px;margin:34px 0 38px}.rule-card{margin:0;padding:18px;background:#fdfcf7c2;border:1px solid var(--line)}.rule-card--wide{grid-column:1 / -1}.rule-board{display:block;width:100%;aspect-ratio:1 / 1;background:#f6f4ee52;border:1px solid var(--line-soft)}.rule-card--wide .rule-board{aspect-ratio:4 / 3}.rule-hole{fill:#fdfcf7c7;stroke:#15140f38;stroke-width:1.2}.rule-home{fill:#1d6f8414}.rule-goal{fill:#a8332117}.rule-piece-a{fill:#1d6f84;stroke:#fdfcf7;stroke-width:1.4}.rule-piece-b{fill:#a83321;stroke:#fdfcf7;stroke-width:1.4}.rule-target{fill:#1d6f841f;stroke:#1d6f84;stroke-width:1.6}.rule-arrow{fill:none;stroke:#15140f;stroke-width:2.2;stroke-linecap:round;stroke-linejoin:round}.rule-arrow-head{fill:#15140f;stroke:none}figcaption{margin-top:16px;color:var(--muted);font-size:15px;line-height:1.5}figcaption strong{color:var(--ink)}.opening-replay{margin:30px 0 36px;padding:18px;background:#fdfcf7c2;border:1px solid var(--line)}.opening-replay__header{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:14px}.opening-replay__title{margin:0;color:var(--muted);font-size:13px;font-weight:700;letter-spacing:0;text-transform:uppercase}.opening-replay__button{min-height:34px;padding:0 12px;border:1px solid var(--line);background:#f6f4eeb8;color:var(--ink);font:inherit;font-size:13px;font-weight:700;cursor:pointer}.opening-replay__controls{display:inline-flex;align-items:center;gap:8px}.opening-replay__step{width:34px;min-height:34px;padding:0;border:1px solid var(--line);background:#f6f4eeb8;color:var(--ink);font:inherit;font-size:18px;font-weight:700;line-height:1;cursor:pointer}.opening-replay__button:disabled,.opening-replay__step:disabled{cursor:default;opacity:.48}.opening-replay__layout{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(220px,.95fr);gap:16px;align-items:start}.opening-replay__board{display:block;width:100%;aspect-ratio:1 / 1;background:#f6f4ee52;border:1px solid var(--line-soft)}.opening-replay__path{fill:none;stroke:#15140f;stroke-width:2.2;stroke-linecap:round;stroke-linejoin:round}.opening-replay__arrow-head,.strategy-arrow-head{fill:#15140f;stroke:none}.opening-replay__table-wrap{max-height:360px;overflow:auto;border:1px solid var(--line-soft);background:#fdfcf79e}.opening-replay table{margin:0;border:0;background:transparent}.opening-replay th,.opening-replay td{padding:10px 12px;white-space:nowrap}.opening-replay tr.is-active td{background:#a8332114;color:var(--ink);font-weight:700}.opening-replay tr.is-player-two td:first-child{border-left:3px solid rgba(168,51,33,.72)}.strategy-diagrams{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px;margin:30px 0 34px}.strategy-diagram{margin:0;padding:18px;background:#fdfcf7c2;border:1px solid var(--line)}.strategy-board{display:block;width:100%;aspect-ratio:1 / 1;background:#f6f4ee52;border:1px solid var(--line-soft)}.strategy-triangle{fill:#a833211c;stroke:#a8332194;stroke-width:2;stroke-linejoin:round}.strategy-chain{fill:none;stroke:#15140f;stroke-width:2.2;stroke-linecap:round;stroke-linejoin:round}.strategy-piece-jumpstar,.strategy-piece-you{stroke:#fdfcf7;stroke-width:2}.strategy-piece-jumpstar{fill:#a83321}.strategy-piece-you{fill:#1d6f84}.actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}.button{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:0 18px;border:1px solid var(--ink);color:var(--ink);text-decoration:none;font-weight:700}.button.primary{background:var(--ink);color:var(--paper)}aside{position:sticky;top:28px;align-self:start;padding:22px;background:#fdfcf7b8;border:1px solid var(--line)}aside h2{margin:0 0 12px;font-size:22px;line-height:1.1}aside p,aside li{font-size:14px;line-height:1.55}aside nav{display:grid;gap:2px;margin-top:18px}aside nav a{display:block;padding:6px 0;color:var(--muted);font-size:14px;font-weight:600;line-height:1.25;text-decoration:none}aside nav a:hover{color:var(--ink)}footer{margin-top:60px;padding-top:24px;border-top:1px solid var(--line);color:var(--muted);font-size:14px}@media(max-width:820px){.page{width:min(100vw - 36px,1040px);margin-left:auto;margin-right:auto}main{grid-template-columns:1fr;gap:18px;padding-top:38px}article{max-width:none}aside{position:static;order:-1}.rule-diagrams{grid-template-columns:1fr}.rule-card--wide .rule-board{aspect-ratio:1 / 1}table{display:block;overflow-x:auto;white-space:nowrap}.flow-row,.opening-replay__layout,.strategy-diagrams{grid-template-columns:1fr}.guide-game-shot figcaption{grid-template-columns:1fr;gap:7px}}@media(max-width:520px){h1{font-size:48px}.practice-drills,.strategy-pair{grid-template-columns:1fr}.practice-drills>div{min-height:0}.chain-marker{width:23px;height:23px;font-size:11px}.chain-marker--start{width:auto}.opening-replay{padding:12px}.opening-replay__header{align-items:flex-start;flex-direction:column}.game-case__facts strong{font-size:28px}}:lang(ja) h1,:lang(ja) h2,:lang(ja) h3{word-break:auto-phrase;line-break:strict}.move-story,.race-board{margin:30px 0 36px;padding:18px;background:#fdfcf7c2;border:1px solid var(--line)}.move-story__header{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px;margin-bottom:14px}.move-story__title{margin:0;color:var(--muted);font-size:13px;font-weight:700;text-transform:uppercase}.move-story__steps{display:flex;flex-wrap:wrap;gap:6px}.move-story__steps button{min-height:34px;padding:0 12px;border:1px solid var(--line);background:#f6f4eeb8;color:var(--ink);font:inherit;font-size:13px;font-weight:700;cursor:pointer}.move-story__steps button[aria-pressed=true]{background:#15140f;border-color:#15140f;color:#fdfcf7}.move-story__board,.race-board svg{display:block;width:100%;max-width:560px;margin:0 auto;aspect-ratio:6 / 7}.move-story__caption,.race-board figcaption{margin:14px 0 0;min-height:3em;color:var(--ink);font-size:16px;line-height:1.5}.story-piece-0{fill:#15140f;stroke:#fdfcf7;stroke-width:1.4}.story-piece-1{fill:#a83321;stroke:#fdfcf7;stroke-width:1.4}.story-piece--dim{opacity:.35}.story-ghost{fill:#fdfcf780;stroke-width:2;stroke-dasharray:4 3}.story-ghost-0{stroke:#15140f}.story-ghost-1{stroke:#a83321}.story-ring{fill:none;stroke:#b27a20;stroke-width:2.6}.story-path{fill:none;stroke-width:2.6;stroke-linecap:round;stroke-linejoin:round}.story-path-0{stroke:#15140f}.story-path-1{stroke:#a83321}.story-path--ghost{stroke-dasharray:2 6;stroke-width:3}.story-path--faint{opacity:.3}.story-arrow-0{fill:#15140f;stroke:none}.story-arrow-1{fill:#a83321;stroke:none}.story-label{fill:#fdfcf7;font-size:12px;font-weight:700;pointer-events:none}.ideas-glance{margin:0 0 36px;padding:18px 22px;background:#fdfcf7c2;border:1px solid var(--line)}.ideas-glance ol{margin:8px 0 0;padding-left:22px;columns:2;column-gap:32px}.ideas-glance li{break-inside:avoid;margin:0 0 6px}.ideas-glance a{color:var(--ink);text-decoration-color:#15140f47;text-underline-offset:3px}.ideas-glance a:hover{text-decoration-color:currentColor}.strategy-faq h3{margin:26px 0 6px}@media(max-width:640px){.ideas-glance ol{columns:1}.move-story,.race-board{padding:12px}}