:root{--bg:#080d18;--panel:#101827;--water:#17243a;--line:#35445f;--text:#edf4ff;--muted:#b8c5d9;--gold:#f1d38e;--blue:#8fc6ee;--danger:#f19a91}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font:15px/1.65 system-ui,"Yu Gothic",sans-serif}button,select{font:inherit}button,a,select{-webkit-tap-highlight-color:transparent}button{cursor:pointer;min-height:44px;border:1px solid var(--line);border-radius:8px;padding:10px 15px;color:var(--text);background:var(--water)}button:disabled{opacity:.5;cursor:default}button:hover:not(:disabled){filter:brightness(1.15)}a{color:inherit;text-decoration:none}a:hover{text-decoration:underline}button:focus-visible,a:focus-visible,select:focus-visible,input:focus-visible{outline:3px solid var(--gold);outline-offset:3px}[hidden]{display:none!important}
header,footer{max-width:1320px;margin:auto;display:flex;align-items:center;justify-content:space-between;padding:22px 40px}header>a{display:flex;align-items:center;gap:12px}.moon{color:var(--gold);font-size:28px;line-height:1}.quiet{background:transparent;color:var(--muted);border-color:transparent}.quiet:hover{border-color:var(--line)}main{max-width:1280px;margin:auto;padding:28px 24px 48px}.intro{display:flex;justify-content:space-between;align-items:center;padding-bottom:28px}.eyebrow{font-size:12px;letter-spacing:.15em;color:var(--gold);margin:0 0 10px}h1{font-family:serif;font-size:66px;letter-spacing:.16em;font-weight:500;line-height:1.1;margin:0}h1 span{font:14px system-ui;letter-spacing:.3em;margin-left:20px;color:var(--muted)}.tagline{font-size:20px;margin:18px 0 0}.intro-note{color:var(--muted);border-left:1px solid var(--line);padding-left:30px;margin-right:6px}.setup{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;border:1px solid var(--line);padding:22px;background:var(--panel);border-radius:12px;margin-bottom:24px}.field{display:flex;flex-direction:column;gap:6px}label{color:var(--muted);font-size:13px}select{width:100%;min-height:44px;border:1px solid var(--line);border-radius:7px;background:var(--bg);padding:8px;color:var(--text)}.start-actions{display:flex;gap:12px;grid-column:1/3}.primary{background:var(--gold);color:#101827;font-weight:700;border-color:var(--gold)}.primary span{margin-left:16px}.secondary{background:transparent}.set-note{margin:0;align-self:center;color:var(--muted);font-size:13px}
.play-layout{display:grid;grid-template-columns:minmax(0,1.52fr) minmax(330px,1fr);gap:24px;align-items:start}.arena{border:1px solid var(--line);border-radius:14px;background:radial-gradient(ellipse at 50% 45%,#18333b,#111d2d 60%,#101827);overflow:hidden;scroll-margin-top:12px}.board-heading{display:flex;justify-content:space-between;gap:12px;padding:15px 22px;color:var(--muted);font-size:13px;border-bottom:1px solid #35445f80}.turn-line{display:flex;gap:14px;align-items:start;padding:18px 22px 0;min-height:88px}.turn-line>span{font-size:24px;color:var(--gold)}.turn-line strong{font-size:16px}.turn-line p{font-size:13px;color:var(--muted);margin:4px 0}.board-tools{display:flex;gap:14px;align-items:center;justify-content:center;flex-wrap:wrap;padding:5px 14px 10px;font-size:12px}.board-tools label{display:flex;align-items:center;gap:6px;min-height:44px;cursor:pointer;font-size:12px}.board-tools input{accent-color:var(--gold);width:18px;height:18px}.goal{margin:0 18px;padding:7px 12px;border:1px solid currentColor;background:#080d1875;border-radius:7px;font-size:12px;text-align:center;letter-spacing:.09em}.path-board{position:relative;height:530px;margin:0 16px}.path-board svg{position:absolute;inset:0;width:100%;height:100%;overflow:visible;pointer-events:none}.path{stroke:#637a8b;stroke-width:.38;opacity:.42;vector-effect:non-scaling-stroke}.path.diagonal{stroke:#7e91a0;opacity:.3;stroke-dasharray:3 3;stroke-width:1;vector-effect:non-scaling-stroke}.path.straight{stroke-width:2}.move-path{stroke:var(--gold);stroke-width:3;opacity:.9;vector-effect:non-scaling-stroke}.cpu-path{stroke:var(--text);stroke-width:4;stroke-dasharray:7 4;vector-effect:non-scaling-stroke}.last-path{stroke:#f1d38e;stroke-width:2;opacity:.45;vector-effect:non-scaling-stroke}.node{position:absolute;transform:translate(-50%,-50%);width:52px;height:52px;min-height:0;padding:2px;border-radius:50%;border:1px solid #5a7185;background:#102032;opacity:1;display:flex;flex-direction:column;align-items:center;justify-content:center;line-height:1.2;box-shadow:0 3px 9px #0003}.node:disabled{opacity:1;cursor:default}.node .piece{font-size:22px;line-height:1.1}.node .coordinate{font:12px/1.3 ui-monospace,monospace;color:#c5d5e4}.node.empty .piece{font-size:15px;color:#7995a7}.node.p1{background:#4b4029;border-color:#cfb472;color:var(--gold)}.node.p2{background:#193b52;border-color:#739fbf;color:var(--blue)}.node.available{border:2px dashed currentColor;box-shadow:0 0 0 3px #080d18}.node.destination{border:3px double var(--gold);background:#263e3c;color:var(--gold)}.node.destination.p2,.node.destination.p1{border-color:var(--danger)}.node.selected-from{border:3px solid var(--gold);box-shadow:0 0 0 4px #f1d38e50}.node.selected-to{border:3px solid #edf4ff;box-shadow:0 0 0 4px #edf4ff55}.node.last{box-shadow:0 0 0 3px #dfeaf38a}.node.cpu-from,.node.cpu-to{border:3px solid #fff;box-shadow:0 0 0 4px #edf4ff80}.node.cpu-to{background:#405469}.node .badge{position:absolute;top:-6px;right:-6px;min-width:20px;height:20px;display:grid;place-items:center;font-size:12px;border-radius:50%;background:var(--gold);color:var(--bg);border:1px solid var(--bg)}.node .danger{position:absolute;left:-5px;bottom:-3px;min-width:18px;height:18px;display:grid;place-items:center;font-size:12px;font-weight:700;color:var(--bg);background:var(--danger);border-radius:50%}.board-legend{display:flex;justify-content:center;flex-wrap:wrap;gap:5px 14px;padding:14px 10px 16px;color:var(--muted);font-size:12px}.p1{color:var(--gold)}.p2{color:var(--blue)}
.dashboard{display:flex;flex-direction:column;gap:16px}.scoreboard{display:grid;grid-template-columns:1fr 1fr;gap:12px}.player{border:1px solid var(--line);border-radius:11px;background:var(--panel);padding:17px 16px;min-width:0}.player.active{border-color:currentColor}.player>span{font-size:13px}.player small{font-size:12px;font-weight:400;margin-left:5px}.player>strong{display:block;font-size:36px;line-height:1.3;font-weight:500;margin:8px 0 4px}.statistics{color:var(--muted);font-size:13px;display:grid;gap:3px}.statistics b{color:var(--text);font-weight:500}.stat-note{font-size:12px;color:var(--muted);margin:-5px 0 0}.decision{border:1px solid var(--line);border-radius:12px;background:var(--panel);padding:22px}.decision h2{font-family:serif;font-size:26px;line-height:1.4;margin:0 0 10px}.decision>p:not(.eyebrow){color:var(--muted);font-size:14px;margin:0 0 15px}.preview{background:var(--bg);border-radius:7px;padding:15px;font-size:13px;min-height:105px;color:var(--muted);margin-bottom:14px}.preview strong{display:block;color:var(--text);margin:5px 0}.preview .warning{color:var(--danger)}#confirm,#practice-next,#rematch,#result-help{width:100%;min-height:48px}#clear{margin-top:8px;width:100%;font-size:13px}.small-rule{border-top:1px solid var(--line);padding-top:15px;color:var(--muted);font-size:13px}.small-rule strong{color:var(--text);font-weight:500}.small-rule p{margin:5px 0}.history{border-top:1px solid var(--line);padding-top:13px;color:var(--muted);font-size:13px}.history summary{cursor:pointer;min-height:44px}.history ol{max-height:260px;overflow:auto;padding-left:22px;margin:0}.history li{margin:7px 0}.history small{display:block;font-size:12px;color:var(--muted)}#result-actions{display:grid;gap:12px}.result-home{font-size:13px;justify-self:center;padding:5px 10px;min-height:44px;display:flex;align-items:center;color:var(--muted)}.board-confirm{display:none}.footnotes{display:grid;grid-template-columns:repeat(3,1fr);gap:28px;margin-top:42px;border-top:1px solid var(--line);padding-top:28px}.footnotes b{font-size:12px;letter-spacing:.12em;color:var(--gold);font-weight:400}.footnotes h3{font:20px serif;margin:12px 0}.footnotes p{font-size:14px;color:var(--muted);margin:0}footer{border-top:1px solid #35445f50;color:var(--muted);font-size:12px}dialog{border:1px solid var(--line);border-radius:14px;background:var(--panel);color:var(--text);max-width:620px;width:calc(100% - 28px);padding:28px;max-height:90dvh;overflow:auto}dialog::backdrop{background:#030810c9}dialog h2{font:28px serif;line-height:1.4}dialog p,dialog li{font-size:15px}dialog li{margin:9px 0}dialog ol{padding-left:24px}dialog .close{position:absolute;top:10px;right:10px;font-size:24px;background:none;border:0;padding:2px 10px}.rule-example{background:var(--bg);border-radius:8px;padding:16px;display:grid;gap:8px}.rule-example strong{color:var(--gold);font-size:21px}.rule-example span,.keyboard-note{font-size:13px;color:var(--muted)}
@media(max-width:1050px){header,footer{padding:20px 24px}.play-layout{gap:18px;grid-template-columns:minmax(0,1.25fr) minmax(300px,1fr)}.player{padding:13px 12px}.decision{padding:18px}.intro-note{font-size:13px;padding-left:20px}.node{width:46px;height:46px}.path-board{margin:0 12px}}
@media(max-width:850px){header{padding:18px}main{padding:22px 14px 36px}.intro{padding-bottom:24px}.intro-note{display:none}h1{font-size:52px}h1 span{font-size:13px;margin-left:14px}.tagline{font-size:18px}.setup{grid-template-columns:1fr 1fr;gap:13px;padding:16px;margin-bottom:20px}.setup>.field:nth-child(3){grid-column:1/-1}.start-actions{grid-column:1/-1;gap:10px;flex-wrap:wrap}.set-note{grid-column:1/-1;font-size:12px}.play-layout{display:flex;flex-direction:column;gap:16px}.arena,.dashboard{width:100%}.board-heading{padding:12px 16px;font-size:12px}.turn-line{padding:14px 16px 0;min-height:82px}.turn-line p{font-size:12px}.node{width:50px;height:50px}.board-legend{padding-bottom:10px}.board-confirm{display:grid;gap:10px;position:fixed;left:12px;right:12px;bottom:12px;z-index:20;grid-template-columns:minmax(0,1fr) auto;align-items:center;padding:12px;border:1px solid var(--gold);border-radius:10px;background:#111d2d;box-shadow:0 9px 30px #000b}.board-confirm small{font-size:12px;color:var(--muted)}#board-preview{display:block;font-size:13px}.board-confirm button{min-height:48px;padding:9px 12px;font-size:13px;white-space:nowrap}body.selection-open{padding-bottom:104px}.dashboard{gap:14px}.decision{padding:18px}.decision h2{font-size:24px}.player>strong{font-size:30px}.small-rule{display:none}.footnotes{grid-template-columns:1fr;gap:24px;margin-top:30px}.footnotes h3{font-size:19px}footer{padding:18px 16px;flex-wrap:wrap;gap:8px}}
@media(max-width:480px){.path-board{height:435px;margin:0 10px}.node{width:44px;height:44px}.node .piece{font-size:20px}.node .coordinate{font-size:10px}.board-tools{gap:4px 12px;font-size:11px}.board-tools label{font-size:11px}.goal{font-size:11px}.board-legend{font-size:10px;gap:4px 10px}.node .badge,.node .danger{font-size:10px}.stat-note{font-size:12px}.board-confirm small{font-size:11px}}
@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important;scroll-behavior:auto!important}}
.node .cpu-badge{background:var(--text);font-weight:700}