:root{color-scheme:light;--paper:#eff6fa;--ink:#294c62;--muted:#697f8c;--blue:#2b6b99;--line:#cedee8;--wood:#e8c995;--wood-line:#917048;--white:#fbfcfc}*{box-sizing:border-box}body{margin:0;min-width:300px;background:var(--paper);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;-webkit-font-smoothing:antialiased}button,input{font:inherit}button,a,input,summary{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{cursor:default;opacity:.45}button:focus-visible,a:focus-visible,input:focus-visible,summary:focus-visible{outline:3px solid #3282b2;outline-offset:4px}button{transition:background .15s,box-shadow .15s}a{color:inherit}button,input{min-height:44px}button{border:0}button:not(:disabled):active{transform:translateY(1px)}[hidden]{display:none!important}.masthead,main,footer{width:min(1120px,100% - 80px);margin:0 auto}.masthead{display:flex;justify-content:space-between;align-items:center;padding:28px 0;border-bottom:1px solid var(--line);font-size:13px}.home{text-decoration:none;padding:6px 0}.home:hover{text-decoration:underline;text-underline-offset:5px}.small-brand{color:var(--muted);letter-spacing:.13em}.intro{display:flex;justify-content:space-between;align-items:center;padding:42px 0 36px}.eyebrow{font-size:12px;letter-spacing:.15em;margin:0 0 12px;color:var(--muted)}h1{font-family:"Yuanti SC","STYuanti","YouYuan","PingFang SC",sans-serif;font-size:44px;letter-spacing:.07em;margin:0;font-weight:650;display:flex;align-items:center;gap:20px}.title-stones{position:relative;width:46px;height:38px}.title-stones i{display:block;width:25px;height:25px;border-radius:50%;background:#30434d;position:absolute;left:0;top:0;box-shadow:0 2px 3px #293d4820}.title-stones i+i{background:#fff;top:13px;left:20px;border:1px solid #d3dde3}.intro-note{font-size:13px;line-height:1.9;color:var(--muted);margin:0 2px 0 20px}.game-layout{display:grid;grid-template-columns:272px minmax(0,1fr);gap:60px;align-items:start}.controls{padding-top:3px}.mode-tabs{display:flex;border-bottom:1px solid var(--line);margin-bottom:28px;gap:28px}.mode-tabs button{padding:0 0 12px;background:none;color:var(--muted);border-bottom:2px solid transparent;margin-bottom:-1px;font-size:14px}.mode-tabs button[aria-pressed=true]{color:var(--blue);border-color:var(--blue);font-weight:650}h2{font-size:18px;line-height:1.5;letter-spacing:.015em;margin:0 0 10px;font-weight:650}.help{color:var(--muted);font-size:13px;line-height:1.85;margin:0 0 20px}.primary{color:#fff;background:var(--blue);border-radius:7px;padding:12px 20px;font-size:14px;font-weight:600}.primary:hover:not(:disabled){background:#20577f;box-shadow:0 4px 12px #2b6b991a}.full{width:100%}.secondary{background:#dfebf2;color:var(--blue);border-radius:5px;font-size:12px;padding:8px 11px;white-space:nowrap}.secondary:hover:not(:disabled){background:#cbdfea}.invite-line{display:flex;gap:7px;margin-top:8px}input{width:100%;min-width:0;border:1px solid var(--line);border-radius:5px;background:#ffffff80;color:var(--ink);padding:8px 10px;font-size:12px}input[readonly]{font-family:ui-monospace,SFMono-Regular,monospace;letter-spacing:.05em;font-weight:600}label{font-size:12px;color:var(--muted)}#invitation{margin-top:23px}.fine{font-size:11px;margin:9px 0 0;line-height:1.75}details summary{cursor:pointer;font-size:13px;padding:15px 0;line-height:1.5}#join-details{margin:4px 0 0}#join-form{padding:0 0 12px}.players{padding:21px 0 15px;margin-top:18px;border-top:1px solid var(--line);display:grid;gap:16px}.players>div{display:flex;gap:12px;align-items:center;font-size:13px}.stone{display:inline-block;width:19px;height:19px;border-radius:50%;flex-shrink:0;box-shadow:0 2px 3px #34424b24}.black{background:radial-gradient(circle at 35% 28%,#52606a,#242d34 70%);border:1px solid #27333b}.white{background:radial-gradient(circle at 35% 28%,#fff,#f0f0eb 70%);border:1px solid #cdd4d5}.player-note{margin-left:auto;font-size:11px;color:var(--muted)}.text-button{background:none;color:var(--muted);font-size:12px;padding:8px 0;min-height:38px}.text-button:hover:not(:disabled){color:#a35a43}.rules{margin-top:15px;border-top:1px solid var(--line)}.rules p{font-size:12px;color:var(--muted);line-height:1.9;margin:0 0 12px}.message{font-size:12px;line-height:1.8;color:#a35840;margin:12px 0;min-height:22px;overflow-wrap:anywhere}.board-heading{display:flex;align-items:center;justify-content:space-between;gap:10px;min-height:48px;margin-bottom:10px}.board-heading>div{display:flex;align-items:center;gap:10px}.board-heading h2{font-size:15px;margin:0}.board-heading .stone{width:16px;height:16px}.connection{font-size:11px;color:var(--muted);white-space:nowrap}.board-frame{position:relative;padding:30px;background:linear-gradient(115deg,#efd7ae,#e6c594);border:1px solid #d4b785;border-radius:9px;box-shadow:0 4px 0 #ceb082,0 12px 30px #8b785316;isolation:isolate}.board{display:grid;grid-template-columns:repeat(15,1fr);aspect-ratio:1;width:100%;touch-action:manipulation}.board-row{display:contents}.cell{aspect-ratio:1;padding:0;position:relative;min-height:0;min-width:0;background:none;border:0;border-radius:0;display:grid;place-items:center;z-index:0;touch-action:manipulation}.cell::before,.cell::after{content:"";position:absolute;background:var(--wood-line);opacity:.63;z-index:-1}.cell::before{left:0;right:0;top:calc(50% - .5px);height:1px}.cell::after{top:0;bottom:0;left:calc(50% - .5px);width:1px}.cell[data-col="1"]::before{left:50%}.cell[data-col="15"]::before{right:50%}.cell[data-row="1"]::after{top:50%}.cell[data-row="15"]::after{bottom:50%}.cell .piece{width:80%;height:80%;border-radius:50%;display:block;position:relative}.cell[data-star=true]:not([data-player]) .piece{width:15%;height:15%;background:#7d613d}.cell[data-player="1"] .piece{background:radial-gradient(circle at 32% 25%,#51575b,#202628 65%,#161b1d);box-shadow:1px 3px 4px #44352159,inset 0 0 0 1px #172329}.cell[data-player="2"] .piece{background:radial-gradient(circle at 32% 25%,#fff,#f9f7ef 65%,#e4ddcd);box-shadow:1px 3px 4px #4435214d,inset 0 0 0 1px #ada38a66}.cell[data-last=true] .piece::after{content:"";position:absolute;inset:37%;background:#c27346;border-radius:2px}.cell[aria-disabled=false]:hover .piece{width:76%;height:76%;background:#38515a33;box-shadow:inset 0 0 0 1px #46616a66}.cell:focus-visible{outline:2px solid var(--blue);outline-offset:-1px;border-radius:4px;z-index:2}.column-labels{position:absolute;left:30px;right:30px;top:10px;display:grid;grid-template-columns:repeat(15,1fr);text-align:center;font-family:ui-monospace,monospace;font-size:10px;color:#92734d}.row-labels{position:absolute;top:30px;bottom:30px;left:8px;width:16px;display:grid;grid-template-rows:repeat(15,1fr);align-items:center;text-align:center;font-family:ui-monospace,monospace;font-size:10px;color:#92734d}.board-caption{display:flex;justify-content:space-between;gap:15px;margin:18px 1px 22px;font-size:11px;color:var(--muted);line-height:1.6}#move-count{white-space:nowrap;font-variant-numeric:tabular-nums}.history{border-top:1px solid var(--line)}.history summary{display:flex;justify-content:space-between;gap:12px}.history summary::before{content:'＋';font-size:15px}.history[open] summary::before{content:'−'}.history summary>span:first-of-type{margin-right:auto}#last-move{font-size:12px;color:var(--muted)}#moves{max-height:210px;overflow:auto;display:grid;grid-template-columns:repeat(3,1fr);gap:8px 20px;padding:0;list-style:none;font-size:12px;font-variant-numeric:tabular-nums;color:var(--muted)}#moves li{display:flex;align-items:center;gap:7px}#moves .stone{width:12px;height:12px;box-shadow:none}footer{display:flex;justify-content:center;gap:20px;border-top:1px solid var(--line);padding:25px 0 max(28px,env(safe-area-inset-bottom));margin-top:58px;color:var(--muted);font-size:11px}footer a{text-decoration:none}footer a:hover{text-decoration:underline}@media(min-width:1250px){.game-layout{grid-template-columns:290px 1fr;gap:86px}.play-area{max-width:650px}}@media(max-width:850px){.masthead,main,footer{width:calc(100% - 40px)}.game-layout{grid-template-columns:230px minmax(0,1fr);gap:30px}.intro{padding:30px 0}.board-frame{padding:23px}.column-labels{left:23px;right:23px;top:7px;font-size:9px}.row-labels{top:23px;bottom:23px;left:3px;font-size:9px}.board-heading{align-items:start;flex-direction:column;gap:4px;padding:0 0 4px}.board-heading h2{font-size:14px}#moves{grid-template-columns:repeat(2,1fr)}}@media(max-width:650px){.masthead,main,footer{width:calc(100% - 32px)}.masthead{padding:17px 0}.small-brand{font-size:11px}.intro{padding:29px 0 23px}.intro-note{display:none}h1{font-size:35px;gap:14px}.eyebrow{font-size:11px;margin-bottom:9px}.game-layout{display:flex;flex-direction:column;gap:22px}.controls,.play-area{width:100%}.mode-tabs{margin-bottom:18px;gap:28px}.controls h2{font-size:16px}.help{margin-bottom:13px;font-size:12px}.primary{min-height:44px;padding:10px 16px}.players{margin-top:12px;padding:16px 0 0;display:flex;gap:24px}.players>div{font-size:12px;gap:8px}.player-note{display:none}.rules{margin-top:5px}.rules summary{padding:10px 0}.text-button{margin-top:7px}.message:empty{display:none}.message{margin:6px 0}.board-heading{flex-direction:row;align-items:center;min-height:28px;margin-bottom:12px}.board-heading h2{font-size:13px}.board-frame{padding:21px 17px 17px 21px;border-radius:7px}.column-labels{left:21px;right:17px;top:6px;font-size:8px}.row-labels{top:21px;bottom:17px;left:2px;font-size:8px}.board-caption{font-size:10px;margin:14px 0 17px}.history summary{font-size:12px}#last-move{font-size:11px}#moves{grid-template-columns:repeat(3,1fr);font-size:11px;gap:9px}footer{margin-top:32px;font-size:10px;flex-wrap:wrap;gap:12px}#join-details summary{padding:10px 0}.fine{font-size:11px}.title-stones{transform:scale(.85);transform-origin:left center}}@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}
/* Public introduction and installation guide share the chess table's palette. */
.intro-note p{margin:0 0 12px}.guide-link{color:var(--blue);font-weight:650;text-underline-offset:5px}.game-explainer{margin:-10px 0 36px;max-width:740px;font-size:14px;line-height:1.9;color:var(--muted)}.game-explainer strong{color:var(--ink);margin-right:10px}.ai-guide{margin-top:90px;padding-top:45px;border-top:1px solid var(--line);scroll-margin-top:28px}.guide-heading{max-width:660px}.guide-heading h2{font-size:30px;letter-spacing:-1px;margin:8px 0 16px}.guide-heading>p:not(.eyebrow){line-height:1.9}.setup-steps{list-style:none;counter-reset:setup;margin:32px 0 0;padding:0}.setup-steps>li{counter-increment:setup;position:relative;padding:28px 0 28px 62px;border-top:1px solid var(--line)}.setup-steps>li:before{content:counter(setup);position:absolute;left:0;top:29px;width:34px;height:34px;display:grid;place-items:center;border:1px solid var(--ink);border-radius:50%;font-size:16px;font-weight:700}.setup-steps h3,.guide-notes h3{font-size:18px;margin:4px 0 12px}.setup-steps p{font-size:14px;line-height:1.9;max-width:790px}.download-actions{display:flex;align-items:center;gap:24px;flex-wrap:wrap;margin:20px 0}.download-actions>a{font-size:14px;text-underline-offset:4px}.download-button{display:inline-flex;gap:40px;align-items:center;min-height:48px;padding:12px 20px;background:var(--blue);color:#fff;border-radius:8px;text-decoration:none;font-weight:650}.download-button span{font-size:12px;opacity:.8}.download-button:hover{filter:brightness(.94)}.config-details{max-width:790px;margin:20px 0;border:1px solid var(--line);border-radius:8px;overflow:hidden}.config-details summary{padding:16px;cursor:pointer;font-size:14px;font-weight:650}.code-toolbar{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:0 16px;font-size:12px;color:var(--muted)}.config-details pre{margin:12px 0 0;padding:18px;background:#e3edf4;overflow:auto;font-size:12px;line-height:1.8;tab-size:2}.config-details #config-feedback{margin:0;padding:0 16px}.config-details #config-feedback:not(:empty){padding:12px 16px}.setup-steps p code{font-size:12px;overflow-wrap:anywhere}.guide-notes{display:grid;grid-template-columns:250px 1fr;gap:30px;border-top:1px solid var(--line);padding-top:28px;margin-top:8px}.guide-notes p{font-size:13px;line-height:1.9;margin:0 0 14px;color:var(--muted)}.guide-notes strong{color:var(--ink)}#chess-table{scroll-margin-top:28px}a:focus-visible,summary:focus-visible,pre:focus-visible{outline:3px solid var(--blue);outline-offset:4px}
@media(max-width:650px){.game-explainer{margin-top:0;font-size:13px}.ai-guide{margin-top:56px;padding-top:30px}.guide-heading h2{font-size:25px}.setup-steps>li{padding-left:44px}.setup-steps>li:before{width:28px;height:28px;font-size:14px}.download-actions{gap:16px}.download-button{gap:20px;padding:12px 14px}.guide-notes{grid-template-columns:1fr;gap:4px}.code-toolbar{align-items:flex-start;flex-direction:column}.intro-note{max-width:none}}
@media(max-width:650px){.intro{align-items:flex-start;flex-direction:column;gap:18px}.intro .intro-note{display:block;font-size:14px;text-align:left}.intro .intro-note p{line-height:1.8}}