:root{color-scheme:light dark;--canvas:#f6f4f1;--ink:#302c34;--muted:#726b76;--line:#ded9de;--panel:#fcfbf9;--purple:#75518e;--on-purple:#fff;--soft:#ebe4f0;--board:#e1cfb3;--grid:#826b53;--frame:#cfb896;--danger:#a3323d}
@media(prefers-color-scheme:dark){:root{--canvas:#201e23;--ink:#f1edf4;--muted:#b5adbc;--line:#403a46;--panel:#29252e;--purple:#c7a8e0;--on-purple:#281c33;--soft:#3b3046;--board:#c6ad88;--grid:#63513d;--frame:#a88d6a;--danger:#f4a4ad}}
*{box-sizing:border-box}
html{overscroll-behavior-y:none}
[hidden]{display:none!important}
body{margin:0;background:var(--canvas);color:var(--ink);font:15px/1.55 -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif}
a{color:inherit;text-decoration:none}
button,input{font:inherit}
button,a,input{touch-action:manipulation;-webkit-tap-highlight-color:transparent}
button{cursor:pointer;border:1px solid transparent;border-radius:12px;padding:11px 16px;transition:background-color .15s ease,opacity .15s ease}
button:disabled{cursor:default;opacity:.55}
button:focus-visible,a:focus-visible,input:focus-visible{outline:3px solid var(--purple);outline-offset:3px}
.shell{max-width:1104px;margin:auto;padding:28px max(24px,env(safe-area-inset-right)) 40px max(24px,env(safe-area-inset-left))}
.top{display:flex;justify-content:space-between;align-items:center;gap:16px}
.brand{display:flex;align-items:center;gap:12px;font-size:15px;font-weight:650;letter-spacing:.05em}
.brand-sub{color:var(--muted);font-size:12px;font-weight:400;letter-spacing:0}
.mark{display:grid;place-items:center;width:34px;height:34px;background:var(--soft);color:var(--purple);border-radius:10px;font-size:14px;letter-spacing:-.15em;padding-right:3px}
.room{font-size:12px;color:var(--muted);white-space:nowrap}
.room b{margin-left:7px;font-weight:500;letter-spacing:.12em;color:var(--ink);font-variant-numeric:tabular-nums}
.heading{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:32px 0 28px}
.eyebrow{margin:0 0 5px;color:var(--muted);font-size:12px;letter-spacing:.12em}
h1{font-size:30px;font-weight:650;letter-spacing:-.035em;line-height:1.3;margin:0;text-wrap:balance}
.identity{padding:7px 12px;border:1px solid var(--line);border-radius:24px;font-size:12px;color:var(--purple)}
.play-area{display:grid;grid-template-columns:minmax(0,1fr) 272px;gap:36px;align-items:start}
.board-column{min-width:0}
.board-toolbar{min-height:44px;display:flex;align-items:flex-start;justify-content:space-between;gap:16px;font-size:13px}
.status{color:var(--purple);overflow-wrap:anywhere}
#move-count{color:var(--muted);white-space:nowrap;font-variant-numeric:tabular-nums}
.board-frame{padding:18px;border:1px solid var(--frame);border-radius:18px;background:var(--board);box-shadow:inset 0 0 0 5px #ffffff18,0 10px 24px #2c21100b}
.board{position:relative;display:grid;grid-template-columns:repeat(15,minmax(0,1fr));grid-template-rows:repeat(15,minmax(0,1fr));width:100%;aspect-ratio:1;isolation:isolate;scroll-margin-top:16px}
.board-art{position:absolute;inset:0;width:100%;height:100%;pointer-events:none;overflow:visible}
.grid-lines{stroke:var(--grid);stroke-width:.022;fill:none;opacity:.8}
.star-marks{fill:var(--grid)}
.center-cross{stroke:var(--grid);stroke-width:.055;stroke-linecap:round}
.cell{z-index:1;position:relative;border:0;border-radius:4px;background:none;padding:0;min-width:0;min-height:0;appearance:none}
.cell:disabled{opacity:1}
.cell:focus-visible{outline:2px solid var(--purple);outline-offset:-2px}
.stone{display:inline-block;flex-shrink:0;width:24px;height:24px;border-radius:50%;box-shadow:0 2px 3px #0002}
.stone.black{background:radial-gradient(circle at 32% 26%,#55515a,#232127 65%);border:1px solid #201e24}
.stone.white{background:radial-gradient(circle at 32% 26%,#fff,#eee9df 75%);border:1px solid #b9b0a2}
.cell .stone{position:absolute;width:82%;height:82%;left:50%;top:50%;transform:translate(-50%,-50%);pointer-events:none}
.cell.last-move .stone::after{content:"";position:absolute;width:20%;height:20%;top:50%;left:50%;transform:translate(-50%,-50%);border-radius:50%;background:#c5a4e0}
.cell.last-move .white::after{background:#75518e}
.win-art{position:absolute;inset:0;width:100%;height:100%;z-index:2;pointer-events:none;overflow:visible}
#winning-lines{stroke:#8b479f;stroke-width:.07;stroke-linecap:round;opacity:.9}
.cell.winning::after{content:"";position:absolute;inset:0;border:2px solid #8b479f;border-radius:5px;pointer-events:none}
.cell.selected::after{content:"";position:absolute;inset:-8%;border:2px solid #75428f;border-radius:5px;box-shadow:0 0 0 2px #fffa;pointer-events:none}
.cell.selected::before{content:"";position:absolute;width:76%;height:76%;left:50%;top:50%;transform:translate(-50%,-50%);border-radius:50%;background:#302c3470;pointer-events:none}
.board[data-color="white"] .cell.selected::before{background:#ffffffb3}
.stone.undecided{border:1px dashed var(--muted);background:var(--soft);box-shadow:none}
#round-info{font-size:12px;color:var(--purple);margin:0;line-height:1.7}
.result-banner{margin-top:14px;padding:12px 16px;background:var(--soft);border-radius:12px;border-left:3px solid var(--purple);color:var(--ink);font-size:14px}
.placement{display:flex;align-items:center;gap:8px;min-height:64px;padding:10px 0}
.placement>span{flex:1;min-width:0;font-size:12px;color:var(--muted)}
.placement button{font-size:13px;min-height:44px;white-space:nowrap;padding:10px 12px}
.board-frame{touch-action:pinch-zoom;user-select:none;-webkit-user-select:none;-webkit-touch-callout:none}
.board{overflow-anchor:none}
.board-footer{display:flex;justify-content:space-between;gap:12px;padding-top:14px;color:var(--muted);font-size:11px}
.side{min-width:0;border-left:1px solid var(--line);padding:8px 0 0 24px;display:grid;gap:24px}
.side-heading{display:flex;justify-content:space-between;font-size:14px;font-weight:600}
.side-heading span{font-weight:400;font-size:11px;color:var(--muted)}
.players{display:grid;gap:8px}
.players>[data-seat]{display:flex;align-items:center;gap:12px;padding:12px;border:1px solid transparent;border-radius:12px}
.players>[data-seat].active-turn{background:var(--panel);border-color:var(--line)}
.players [data-seat]>div{flex:1;min-width:0}
.players strong{display:block;font-size:14px;font-weight:550;overflow-wrap:anywhere}
.players [data-seat]>div>span{display:block;color:var(--muted);font-size:11px;margin-top:2px}
.players [data-badge]{font-size:11px;color:var(--purple);white-space:nowrap}
.invite{display:grid;gap:10px;border-top:1px solid var(--line);padding-top:22px}
.invite label{font-size:12px;font-weight:500}
.invite input{width:100%;min-width:0;padding:10px 12px;border:1px solid var(--line);border-radius:10px;background:var(--panel);color:var(--muted);font-size:11px}
.primary{background:var(--purple);color:var(--on-purple);font-weight:550}
.quiet{background:var(--soft);color:var(--ink)}
.danger{color:var(--danger);background:none;border-color:var(--line)}
.actions{display:flex;flex-wrap:wrap;gap:8px}
.actions:empty{display:none}
.actions button{font-size:13px}
.hint{font-size:12px;color:var(--muted);line-height:1.8;margin:0}
.feedback{padding:10px 12px;border-left:2px solid var(--purple);background:var(--soft);font-size:13px;overflow-wrap:anywhere}
.feedback.error{color:var(--danger);border-color:var(--danger);background:var(--panel)}
.back-link{color:var(--muted);font-size:12px;justify-self:start}
.back-link span{margin-left:12px}
.skip{position:absolute;left:-9999px}.skip:focus{left:16px;top:8px;z-index:5;background:var(--panel);padding:8px}
.lobby{max-width:660px;padding-top:64px}.lobby .heading{padding-top:64px}.lobby-start{display:inline-block;margin:28px 0;border-radius:12px;padding:12px 24px}
@media(min-width:761px){.shell:not(.lobby){max-width:clamp(820px,calc(100svh + 72px),1104px)}}
@media(hover:hover){button:not(:disabled):hover,.lobby-start:hover{filter:brightness(.95)}.cell:not(:disabled):hover{background:#75518e18}.back-link:hover{color:var(--purple)}}
@media(max-width:760px){.shell{padding:20px 16px 32px}.heading{padding:28px 0 22px}.play-area{grid-template-columns:1fr;gap:28px}.board-frame{padding:12px;border-radius:14px}.side{border-left:0;border-top:1px solid var(--line);padding:22px 0 0;gap:16px}.players{grid-template-columns:1fr 1fr;gap:8px}.players>[data-seat]{padding:10px 8px;gap:8px}.identity{max-width:52%;text-align:right}.board-toolbar{font-size:12px}.board-footer{font-size:10px}.side-heading{font-size:13px}.invite{padding-top:16px}.brand-sub{font-size:11px}h1{font-size:28px}}
@media(prefers-reduced-motion:reduce){button{transition:none}}
@media(max-width:760px){
  .shell{padding:16px max(12px,env(safe-area-inset-right)) max(24px,env(safe-area-inset-bottom)) max(12px,env(safe-area-inset-left))}
  .heading{padding:18px 0 16px}.eyebrow{display:none}h1{font-size:24px}
  .board-toolbar{min-height:46px;align-items:center;padding-bottom:8px}.status{line-height:1.5}
  .board-frame{padding:8px}.board-footer{padding-top:6px}.play-area{gap:18px}
  .side{padding-top:16px;gap:12px}.players>[data-seat]{padding:8px}.side-heading{font-size:12px}
  .placement{min-height:68px}.placement>span{font-size:11px}.result-banner{font-size:13px}
}