@charset "UTF-8";
:root{color-scheme:dark;--bg:#101511;--ink:#efeee5;--muted:#a5ada2;--gold:#d5bb82;--line:rgba(213,187,130,.2);--serif:"Hiragino Mincho ProN","Yu Mincho",YuMincho,serif;--sans:"Hiragino Kaku Gothic ProN","Yu Gothic",Meiryo,sans-serif}
*{box-sizing:border-box}html{font-size:16px}body{margin:0;background:radial-gradient(ellipse at 36% 43%,#273025 0,#141b16 38%,#101511 75%);color:var(--ink);font-family:var(--sans);font-size:18px;line-height:1.65;min-width:280px}button,select{font:inherit}button,a,select{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{cursor:default;opacity:.42}button:focus-visible,a:focus-visible,select:focus-visible,summary:focus-visible,canvas:focus-visible{outline:2px solid var(--gold);outline-offset:5px}button{color:inherit}button svg{fill:none;stroke:currentColor;stroke-width:1.3;width:20px;height:20px;flex-shrink:0}button{transition:background .2s,color .2s,border-color .2s}button:not(:disabled):hover{border-color:var(--gold)}[hidden]{display:none!important}a{color:inherit;text-decoration:none}.masthead{height:105px;margin:0 4.3%;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:20px}.brand-mark{font:48px/1 var(--serif);color:var(--gold)}.brand-name{font:27px/1.15 Georgia,serif;letter-spacing:.2em}.brand-name>span{display:block;font:9px/2.7 var(--sans);letter-spacing:.24em}.room{display:flex;align-items:center;gap:12px;font-size:16px;color:#c5cbbf}.live-dot{width:6px;height:6px;border-radius:50%;background:var(--gold);box-shadow:0 0 14px #d5bb8266}.room-number{font:16px/1 Georgia,serif;letter-spacing:.15em;color:var(--muted)}.quiet-button{display:flex;align-items:center;gap:10px;border:0;background:none;padding:10px 0;font-size:16px;color:#d4d8cf}.help-icon{font:16px/21px Georgia,serif;border:1px solid #7e8878;border-radius:50%;height:23px;width:23px}.workspace{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:40px;max-width:1800px;margin:0 auto;padding:30px 4.3% 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327px),720px);min-width:0;isolation:isolate}.stage-watermark{font:clamp(250px,35vw,510px)/1 var(--serif);color:#acb99a;opacity:.025;position:absolute;left:50%;top:48%;transform:translate(-50%,-50%);pointer-events:none;z-index:-1}#scene-host{position:absolute;inset:0;touch-action:manipulation}#scene-host canvas{width:100%;height:100%;display:block;touch-action:manipulation}.scene-loading{position:absolute;inset:0;display:grid;place-items:center;font-size:18px;color:var(--gold);pointer-events:none}.scene-caption{position:absolute;bottom:3px;left:0;right:0;pointer-events:none;text-align:center;font-size:16px;color:#a3ad95;opacity:.5;letter-spacing:.1em}.board-bottomline{display:flex;align-items:center;justify-content:space-between;gap:16px;margin:16px 0 12px}.board-bottomline p{margin:0;font-size:16px;color:#b0baaa}.view-label{font-size:16px;white-space:nowrap;color:var(--gold)}.view-tools{display:flex;gap:20px}.tool-button{background:none;display:flex;align-items:center;gap:10px;font-size:16px;border:1px solid transparent;border-bottom:1px solid transparent;padding:7px 0;color:#c0c7b9}.tool-button[aria-pressed=true]{color:var(--gold);border-bottom-color:var(--gold)}.control-rail{border-left:1px solid var(--line);padding:27px 0 0 34px;display:flex;flex-direction:column;position:relative}.eyebrow{font:10px/1.5 var(--sans);letter-spacing:.22em;color:var(--gold)}.rail-intro h1{font:500 44px/1.6 var(--serif);letter-spacing:.15em;margin:24px 0 16px}.rail-intro p{font-size:16px;line-height:1.8;color:#bbc3b4;margin:0}.setup{margin-top:34px}.setup label{display:block;font-size:16px;color:var(--muted);margin-bottom:9px}.setup select{width:100%;padding:10px 14px;border:1px solid var(--line);background:#182019;border-radius:0;font-size:18px;margin-bottom:18px;color:var(--ink)}.primary-button,.secondary-button{width:100%;min-height:54px;font-size:18px;display:flex;align-items:center;justify-content:center;gap:10px;padding:12px 17px;border-radius:1px;line-height:1.5}.primary-button{background:var(--gold);color:#192016;border:1px solid var(--gold)}.primary-button:not(:disabled):hover{background:#e7d19c}.primary-button>span{margin-left:auto}.secondary-button{border:1px solid #5e6752;background:#1b241c;color:#dee3d5}.secondary-button:not(:disabled):hover{background:#2c382a}.secondary-button>span{margin-left:auto}.setup>.secondary-button{margin-top:10px}.setup-note{font-size:16px;color:var(--muted);margin:15px 0 0}.rail-footer{margin-top:auto;padding-top:35px;display:flex;align-items:center;gap:14px}.seal{font:27px/38px var(--serif);color:#ba7458;border:1px solid #a05e48;width:37px;height:39px;text-align:center}.rail-footer>span:last-child{font:9px/1.8 var(--sans);letter-spacing:.2em;color:#8b967f}.site-footer{display:flex;align-items:center;justify-content:space-between;gap:20px;margin:15px 4.3% 0;padding:22px 0 28px;border-top:1px solid var(--line)}.site-footer>span:first-child{font:10px/1.5 var(--sans);letter-spacing:.24em;color:#9ba68c}.site-footer>span:last-child{font:16px var(--serif);letter-spacing:.08em;color:#a2ad97}.match{margin-top:32px}.turn-card{display:flex;align-items:center;gap:12px;padding:18px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.turn-mark{display:grid;place-items:center;width:45px;height:52px;flex-shrink:0;font:28px var(--serif);color:var(--gold);border:1px solid #6e7557;clip-path:polygon(0 18%,50% 0,100% 18%,100% 100%,0 100%);background:#303723}.turn-card h2{font-size:20px;line-height:1.5;margin:4px 0 0;font-weight:500}.status{font-size:16px;color:#bdc8af;min-height:26px;margin:12px 0 18px}.status.check{color:#f1aa88}.move-heading{display:flex;justify-content:space-between;font-size:16px;color:var(--muted);padding-bottom:8px;border-bottom:1px solid var(--line)}.move-list{padding:0;margin:0;list-style:none;max-height:190px;overflow:auto;scrollbar-width:thin;scrollbar-color:#647051 transparent;min-height:65px}.move-list li{display:flex;align-items:center;justify-content:space-between;padding:7px 0;font-size:18px;border-bottom:1px solid #d5bb820d;color:#c9d1bf}.move-list li:last-child{color:var(--gold)}.move-list li span:first-child{font:16px Georgia,serif;color:#8e9b80}.move-list .empty-history{font-size:16px;color:var(--muted);padding:16px 0}.match-actions{display:flex;gap:10px;margin-top:20px}.match-actions button{font-size:16px;min-height:45px;padding:8px}.text-button{background:none;border:0;border-bottom:1px solid transparent;padding:11px 0;font-size:16px;color:var(--muted);width:100%;text-align:center}.text-button:not(:disabled):hover{color:var(--gold)}.thinking{display:flex;gap:3px;margin-left:auto}.thinking i{height:4px;width:4px;background:var(--gold);border-radius:50%;animation:think 1s infinite}.thinking i:nth-child(2){animation-delay:.2s}.thinking i:nth-child(3){animation-delay:.4s}@keyframes think{50%{opacity:.2;transform:translateY(-3px)}}body.playing .rail-intro h1{font-size:34px;margin:14px 0 9px;line-height:1.4}body.playing .rail-intro h1 br{display:block}body.playing .rail-intro p{display:none}body.playing .rail-footer{padding-top:20px}body.playing .match{margin-top:24px}
.board-flat{position:absolute;width:var(--flat-size,92%);aspect-ratio:1;max-width:560px;left:50%;top:50%;transform:translate(-50%,-50%);display:grid;grid-template-columns:repeat(9,1fr);grid-template-rows:repeat(9,1fr);background:#b88748;border:9px solid #b88748;box-shadow:0 10px 0 #76512b,0 24px 50px #0009;gap:1px}.square{background:#d9b277;border:0;padding:0;position:relative;display:grid;place-items:center;aspect-ratio:1;color:#28261e;min-width:0}.square:focus-visible{outline:3px solid #faf2cf;outline-offset:-3px;z-index:2}.flat-piece{font:clamp(19px,2.3vw,35px)/1 var(--serif);display:grid;place-items:center;clip-path:polygon(5% 100%,0 26%,50% 0,100% 26%,95% 100%);background:linear-gradient(120deg,#f4e0ab,#e2bb7c);width:83%;height:87%;padding-top:5px;filter:drop-shadow(1px 2px 1px #533b29);text-shadow:.5px .5px #fff7}.flat-piece.opponent-piece{transform:rotate(180deg)}.flat-piece.promoted{color:#a12f21}.square.selected{background:#f5dd8f}.square.last-move{background:#e5c792}.square.legal:after{content:"";position:absolute;width:23%;height:23%;border-radius:50%;background:#475d34b8;border:2px solid #edf4da;box-shadow:0 0 0 2px #475d3470}.square.legal:has(.flat-piece):after{width:84%;height:87%;border-radius:0;background:transparent;border:3px solid #809339}.square[aria-disabled=true]{cursor:default}
dialog{color:var(--ink);background:#19211a;border:1px solid #74795a;box-shadow:0 30px 100px #0009;border-radius:3px;padding:32px;width:calc(100% - 32px);max-height:calc(100svh - 40px);overflow:auto}dialog::backdrop{background:#050b08be;backdrop-filter:blur(8px)}dialog h2{font:30px/1.5 var(--serif);margin:13px 0 20px}dialog h3{font-size:20px;font-weight:500;margin:8px 0}dialog p{font-size:18px;line-height:1.85;color:#c7d0bf}dialog .primary-button{margin-top:22px}.dialog-top{display:flex;align-items:center;justify-content:space-between;gap:12px}.close-button{font:30px/40px var(--sans);height:44px;width:44px;background:none;border:1px solid var(--line)}.help-dialog{max-width:740px}.help-steps{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;margin:30px 0}.help-steps b{font:21px Georgia,serif;color:var(--gold)}.help-steps p{font-size:16px;margin:0}.help-dialog details{border-top:1px solid var(--line);padding:16px 0}.help-dialog summary{cursor:pointer;font-size:18px;color:var(--gold)}.piece-guide b{display:inline-block;width:75px;color:var(--gold)}.piece-guide p{font-size:16px}.small-dialog{max-width:430px}.small-dialog .dialog-actions{display:flex;gap:12px;margin-top:24px}.dialog-actions .primary-button{margin-top:0}.result-seal{font:56px var(--serif);display:block;color:var(--gold);margin-top:20px}.toast{position:fixed;z-index:10;bottom:25px;left:50%;transform:translateX(-50%);max-width:calc(100% - 32px);width:max-content;background:#2b382b;color:#eee8d9;border:1px solid var(--gold);font-size:16px;padding:12px 20px;box-shadow:0 5px 25px #0005}.noscript{position:fixed;inset:20%;padding:20px;background:#19211a;border:1px solid var(--gold);z-index:4}
@media(min-width:1550px){.workspace{grid-template-columns:minmax(0,1fr) 340px;gap:54px}.control-rail{padding-left:45px}.rail-intro h1{font-size:52px}.primary-button,.secondary-button{font-size:20px}.rail-intro p{font-size:18px}}
@media(min-width:901px) and (max-height:760px){.masthead{height:80px}.workspace{padding-top:18px;gap:28px;grid-template-columns:minmax(0,1fr) 270px}.control-rail{padding-top:15px;padding-left:24px}.rail-intro h1{font-size:36px;line-height:1.45;margin:16px 0 10px}.setup{margin-top:24px}.setup select{margin-bottom:12px}.stage{height:450px}.rail-footer{padding-top:20px}.move-list{max-height:130px}.site-footer{padding-top:17px}.match{margin-top:18px}body.playing .rail-intro h1{font-size:30px}.hand-tray{min-height:42px}.board-bottomline{margin-top:12px}}
@media(max-width:900px){.masthead{height:84px;margin:0 5%}.brand{gap:12px}.brand-mark{font-size:40px}.brand-name{font-size:22px}.brand-name>span{font-size:8px}.room{display:none}.workspace{display:flex;flex-direction:column;gap:25px;padding:22px 5% 20px}.stage{height:clamp(390px,80vw,600px)}.control-rail{border-left:0;border-top:1px solid var(--line);padding:27px 0 0;display:grid;grid-template-columns:1fr 1fr;gap:20px 30px}.rail-intro h1{font-size:38px;line-height:1.45;margin-top:14px}.setup{margin-top:0}.rail-footer{display:none}.match{margin-top:0}.view-tools{justify-content:center;gap:30px}.site-footer{margin-left:5%;margin-right:5%}.site-footer>span:last-child{display:none}.scene-caption{font-size:16px;bottom:0}.flat-piece{font-size:30px}.board-flat{max-width:510px}.board-bottomline{gap:10px}body.playing .control-rail{grid-template-columns:1fr}body.playing .rail-intro{display:none}body.playing .match{margin-top:0}.move-list{max-height:160px}}
@media(max-width:540px){.workspace{padding:18px 12px 20px;gap:22px}.masthead{margin:0 18px}.board-topline{padding:0 5px}.hand-tray{gap:12px;padding:0 5px}.hand-label{font-size:16px}.stage{height:410px;margin:0 -6px}.board-bottomline{align-items:flex-start;padding:0 5px;margin-top:12px}.board-bottomline p{max-width:calc(100% - 43px);font-size:16px;line-height:1.7}.view-tools{gap:23px}.tool-button{font-size:16px;gap:7px}.control-rail{display:block;margin:0 6px;padding-top:25px}.rail-intro h1{font-size:38px;margin:15px 0 12px;line-height:1.4}.rail-intro h1 br{display:none}.rail-intro p{margin-bottom:24px}.setup{margin-top:22px}.setup .primary-button,.setup .secondary-button{font-size:18px;min-height:56px}.setup-note{font-size:16px}.site-footer{margin-top:0;padding-top:16px}.flat-piece{font-size:clamp(20px,5.8vw,29px)}.board-flat{width:var(--flat-size,calc(100% - 12px));max-width:380px;border-width:5px}.scene-caption{display:none}.help-steps{grid-template-columns:1fr;gap:23px}.help-steps>div{display:grid;grid-template-columns:35px 1fr;column-gap:14px}.help-steps h3{margin:0}.help-steps p{grid-column:2}.help-steps b{line-height:1.7}dialog{padding:24px 20px;max-height:calc(100svh - 28px);width:calc(100% - 20px)}dialog h2{font-size:27px}.dialog-actions{flex-wrap:wrap}.dialog-actions>button{flex:1;min-width:105px}.hand-pieces{gap:4px}.hand-piece{padding:1px 7px}.hand-piece .glyph{font-size:22px}.turn-card{padding-top:0;border-top:0}.move-list{max-height:180px}.room-number{display:none}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}

.mobile-start{display:none}.file-notice{padding:18px 5%;background:#d5bb82;color:#192016;font-size:18px}.file-notice a{display:inline-block;text-decoration:underline;margin-left:15px}
@media(max-width:900px){.mobile-start{display:flex;gap:10px;margin:12px 0 16px}.mobile-start button{font-size:18px;min-height:50px;padding:10px 8px}body.playing .mobile-start{display:none}}