:root{font-family:Arial,Helvetica,sans-serif;color:#181a20;background:#008080;font-size:14px;font-synthesis:none;--silver:#c5c5c5;--light:#f5f4ed;--navy:#000080;--shadow:#727272;--teal:#008080;--inset:#f5f3e7;--dark-square:#8496a0;--light-square:#f3efda}
*{box-sizing:border-box}body{margin:0;padding:30px 24px 20px;min-height:100vh;background-image:radial-gradient(#004d4d 0.5px,transparent .5px);background-size:3px 3px}button,input,select{font:inherit;color:inherit}button,select{cursor:pointer}button{border:2px solid;border-color:#fff #444 #444 #fff;background:var(--silver);padding:7px 13px;min-height:34px;border-radius:0;box-shadow:1px 1px 0 #000}button:active:not(:disabled){border-color:#444 #fff #fff #444;box-shadow:none;transform:translate(1px,1px)}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:2px dotted #111;outline-offset:3px}button:disabled{cursor:default;color:#727272;text-shadow:1px 1px #fff;box-shadow:none}a{color:var(--navy)}a:hover{text-decoration-thickness:2px}input,select{border:2px solid;border-color:#707070 #fff #fff #707070;background:#fff;min-height:32px;padding:5px 7px;border-radius:0;min-width:0}select{padding-right:3px}input[type=range]{padding:0;min-height:22px;background:none;border:none;width:100%;accent-color:var(--navy)}[hidden]{display:none!important}h1,h2,h3,h4,p{margin:0}button.text-link{border:0;box-shadow:none;background:none;min-height:0;padding:0;text-align:left;color:var(--navy);text-decoration:underline;font-size:13px}.desktop-heading{max-width:1136px;margin:0 auto 20px;display:flex;align-items:center;gap:13px;color:white;font-family:'Courier New',monospace;font-size:17px;font-weight:bold;letter-spacing:1.2px;text-shadow:1px 1px #004b4b}.desktop-heading>div>span{font-family:Arial,sans-serif;display:block;font-size:11px;font-weight:normal;letter-spacing:1px;margin-top:5px}.desktop-icon{font-family:Georgia,serif;font-size:47px;line-height:1;color:#f1f1d7;filter:drop-shadow(2px 2px #003c3c)}.desktop-caption{margin-left:auto;font-size:10px;font-weight:normal;line-height:1.6;letter-spacing:1.5px;text-align:right;opacity:.85}.program-window{max-width:1136px;margin:auto;padding:3px;border:2px solid;border-color:#fff #242424 #242424 #fff;background:var(--silver);box-shadow:7px 7px 0 #004e4e}.title-bar{background:var(--navy);color:#fff;height:29px;display:flex;align-items:center;gap:8px;padding:3px 4px}.title-bar h1{font-size:15px;letter-spacing:.3px;font-weight:bold}.app-icon{font-family:Georgia,serif;background:var(--silver);color:black;border:1px solid white;line-height:19px;height:21px;width:23px;text-align:center;font-size:20px}.title-version{margin-left:auto;font-size:10px;font-family:'Courier New',monospace;letter-spacing:1px;color:#b7b7e6}.window-controls{display:flex;gap:3px;margin-left:10px}.window-controls i{display:grid;place-content:center;height:20px;width:21px;background:var(--silver);color:#000;font-style:normal;font-weight:bold;font-size:17px;border:2px solid;border-color:#fff #555 #555 #fff;line-height:1}.menu-bar{display:flex;align-items:center;gap:0;min-height:37px;border-bottom:1px solid #808080;padding:0 5px;box-shadow:0 1px 0 #fff}.menu-bar button{border:0;box-shadow:none;padding:8px 13px;min-height:34px;background:none}.menu-bar button[aria-selected=true]{background:var(--navy);color:white}.menu-bar u{text-underline-offset:2px}.manage-link{font-size:12px;margin-left:auto;padding:8px;white-space:nowrap}.tab-panel{padding:15px}.play-toolbar{display:flex;align-items:center;justify-content:space-between;gap:10px;padding-bottom:15px}.toolbar-buttons{display:flex;gap:9px}.toolbar-buttons button span{margin-right:5px}.primary-button{font-weight:bold;outline:1px solid #111;outline-offset:1px}.no-clock{font-family:'Courier New',monospace;font-size:10px;letter-spacing:1px;white-space:nowrap;color:#444;display:flex;align-items:center;gap:7px}.status-led{height:7px;width:7px;background:#197341;border:1px solid #094123;display:inline-block;flex-shrink:0}.play-layout{display:grid;grid-template-columns:minmax(0,1.65fr) minmax(270px,1fr);gap:24px}.chess-workspace{min-width:0}.player-strip{display:flex;align-items:center;gap:8px;padding:8px 11px;background:#b8b8b8;border:1px solid;border-color:#eee #929292 #929292 #eee;min-height:35px;font-size:12px;margin-left:22px}.player-strip.active-player{background:#dddcd1}.player-color{width:11px;height:11px;display:inline-block;border:1px solid #242424;flex-shrink:0}.white-mark{background:#fffdf0;box-shadow:1px 1px 0 #777}.black-mark{background:#292c34;box-shadow:1px 1px 0 #777}.player-detail{margin-left:auto;font-size:10px;color:#515151;font-family:'Courier New',monospace}.board-surround{position:relative;padding:8px 0 24px 22px}.chess-board{display:grid;grid-template-columns:repeat(8,1fr);width:100%;aspect-ratio:1;border:4px solid #343842;box-shadow:1px 1px #fff,-1px -1px #777;touch-action:manipulation}.square{padding:0!important;margin:0!important;border:0!important;box-shadow:none!important;min-height:0;aspect-ratio:1;background:var(--light-square);position:relative;display:grid;place-items:center;border-radius:0;transform:none!important}.square.dark{background:var(--dark-square)}.square img{width:87%;height:87%;object-fit:contain;pointer-events:none;user-select:none;filter:drop-shadow(1px 2px 0 #0003)}.square.last-move:before{content:'';position:absolute;inset:0;background:#d4b64845;pointer-events:none}.square.selected{box-shadow:inset 0 0 0 3px var(--navy)!important;background:#b1b8dc}.square.legal:after{content:'';position:absolute;width:20%;height:20%;border-radius:50%;background:#12273b70;pointer-events:none}.square.legal:has(img):after{width:88%;height:88%;border:4px solid #17324d90;background:none}.square.in-check{background:#d0a499}.square:focus-visible{outline:3px dotted #000;outline-offset:-4px;z-index:1}.rank-labels{position:absolute;left:0;top:12px;bottom:28px;display:grid;grid-template-rows:repeat(8,1fr);width:18px;align-items:center;text-align:center}.file-labels{position:absolute;left:26px;right:4px;bottom:4px;display:grid;grid-template-columns:repeat(8,1fr);text-align:center}.rank-labels,.file-labels{font-family:'Courier New',monospace;font-size:12px;color:#323232;font-weight:bold}.game-message{display:flex;align-items:center;gap:12px;padding:16px 0 0 22px;min-height:60px}.turn-indicator{font-family:Georgia,serif;font-size:30px;line-height:1}.game-message strong{font-size:14px;display:block}.game-message div>span{font-size:11px;color:#555;display:block;margin-top:4px;line-height:1.4}.move-number{margin-left:auto;align-self:flex-start;padding-top:5px;font-family:'Courier New',monospace;font-size:10px;white-space:nowrap;color:#565656}.play-sidebar{display:flex;flex-direction:column;gap:15px;min-width:0}.inset-window{border:2px solid;border-color:#f3f3f3 #6b6b6b #6b6b6b #f3f3f3;box-shadow:1px 1px 0 #333;background:var(--silver);min-width:0}.mini-title{font-size:12px;font-weight:bold;background:#7c7d83;color:#fff;min-height:24px;padding:5px 8px;display:flex;align-items:center;gap:8px;letter-spacing:.1px}.mini-title>span:last-child:not(:first-child){margin-left:auto;font-size:10px;font-weight:normal}.mini-title>button{margin-left:auto;font-size:11px;padding:2px 8px;min-height:22px}.window-content{padding:14px}.player-select-row{display:grid;grid-template-columns:56px 1fr;align-items:center;gap:8px;margin-bottom:10px}.player-select-row label{display:flex;gap:7px;align-items:center;font-size:12px}.player-select-row select{width:100%;font-size:12px}.engine-settings{margin-top:15px;border-top:1px solid #8f8f8f;box-shadow:inset 0 1px #eee;padding-top:13px}.engine-settings>label:first-child{display:flex;justify-content:space-between;font-size:12px}.engine-settings>label>span{font-family:'Courier New',monospace;font-weight:bold;color:#000080}.range-labels{display:flex;justify-content:space-between;font-size:10px;font-family:'Courier New',monospace;color:#5a5a5a;margin-top:-3px}.inline-setting{display:flex;align-items:center;justify-content:space-between;gap:9px;margin-top:12px;font-size:11px}.inline-setting select{font-size:11px;max-width:170px;min-height:28px}.fine-print{font-size:11px;line-height:1.55;color:#4b4b4b}.window-content>.fine-print{margin-top:14px}.settings-hint{font-size:11px;margin-top:7px;color:#000080}.move-window{flex:1;display:flex;flex-direction:column;min-height:176px}.move-book{background:#f8f7ee;border:2px solid;border-color:#747474 #fff #fff #747474;overflow-y:auto;height:150px;margin:8px 8px 0;flex:1}.move-book table{width:100%;border-collapse:collapse;font-family:'Courier New',monospace;font-size:12px}.move-book th{background:#ecebdd;border-bottom:1px solid #c2c1b6;position:sticky;top:0;z-index:1;font-size:10px;color:#60605c;font-weight:normal}.move-book th,.move-book td{text-align:left;padding:5px 9px}.move-book th:first-child,.move-book td:first-child{width:34px;color:#777}.move-book tr:last-child td:not(:first-child){font-weight:bold}.move-book td.latest-move{background:#000080;color:white}.empty-moves{text-align:center;font-size:11px;line-height:1.6;color:#777;padding:16px 5px}.empty-moves span{display:block;font-family:Georgia,serif;font-size:25px;color:#9f9f96;line-height:1.3}.move-actions{padding:9px;display:flex;align-items:center;justify-content:space-between;gap:8px}.move-actions button{font-size:11px;padding:5px 9px;min-height:28px}.move-actions>span{font-size:10px;color:#555;text-align:right}.desk-note{padding:1px 0 0;font-size:11px;line-height:1.55}.desk-note strong{font-family:'Courier New',monospace;font-size:10px;letter-spacing:.3px}.desk-note p{margin:5px 0 9px;color:#4b4b4b}.desk-note .text-link{font-size:11px}.status-bar{margin:8px 3px 2px;display:flex;gap:4px;font-size:10px;font-family:'Courier New',monospace;color:#333}.status-bar>span{border:1px solid;border-color:#818181 #eee #eee #818181;min-height:23px;padding:5px 8px;display:flex;align-items:center;gap:6px}.status-bar>span:first-child{flex:1}.status-bar>span.status-grip{padding:0 3px;font-size:20px;line-height:1;width:22px;display:block;color:#777;border:0}.desktop-footer{max-width:1136px;margin:17px auto 0;display:flex;justify-content:space-between;font-family:'Courier New',monospace;font-size:9px;letter-spacing:1px;color:#c6e0d9}.desktop-footer b{font-weight:normal;opacity:.6}.error-message{margin:12px 15px 0;padding:10px 12px;background:#fff4d1;border:1px solid #6a521e;font-size:12px;line-height:1.5}.document-panel{padding:24px 23px 28px;min-height:600px}.section-heading{display:flex;align-items:center;gap:18px;margin-bottom:26px}.section-heading h2{font-family:Georgia,'Times New Roman',serif;font-size:29px;font-weight:normal;letter-spacing:-.5px}.section-heading p{font-size:12px;color:#4b4b4b;margin-top:7px;line-height:1.5}.section-heading>button{margin-left:auto;flex-shrink:0}.large-pixel-icon{font-size:49px;font-family:Georgia,serif;line-height:1;color:#333;text-shadow:2px 2px #eee}.lab-layout,.about-layout{display:grid;grid-template-columns:1fr 1fr;gap:21px}.benchmark-form{display:flex;flex-direction:column;gap:17px;padding:18px}.benchmark-form label{display:flex;flex-direction:column;gap:7px;font-size:12px}.form-pair{display:grid;grid-template-columns:1fr 1fr;gap:14px}.form-pair input,.form-pair select{width:100%}.benchmark-form>.fine-print{margin-top:0}.form-actions{display:flex;align-items:center;gap:16px}.form-actions a{font-size:12px}.method-summary{padding:18px;font-size:12px;line-height:1.6}.method-summary ol{padding-left:22px;margin:0 0 18px}.method-summary li{padding:0 0 13px 5px}.method-summary li strong,.method-summary li span{display:block}.method-summary li span{color:#4b4b4b;margin-top:3px}.method-caution{padding:12px;background:#d4d3bc;border:1px solid;border-color:#89886f #e9e8d8 #e9e8d8 #89886f;margin-bottom:17px}.method-caution p{margin-top:5px}.experiment-window{margin-top:22px}.empty-state{padding:36px 18px;text-align:center}.empty-state>span{display:block;font-size:29px;color:#73736f;margin-bottom:10px}.empty-state strong{display:block;font-size:14px}.empty-state p{font-size:12px;color:#555;line-height:1.6;max-width:490px;margin:9px auto 0}.empty-state button{margin-top:16px;font-size:12px}.results-notice{font-family:'Courier New',monospace;font-size:11px;border-bottom:1px solid #888;padding-bottom:13px;margin-bottom:18px;color:#444;line-height:1.5}.table-scroll{overflow:auto;background:#f7f6ed;margin:8px;border:2px solid;border-color:#777 #fff #fff #777}.results-table{border-collapse:collapse;width:100%;font-size:12px;white-space:nowrap}.results-table th{text-align:left;background:#deded6;font-weight:normal;border-bottom:1px solid #999}.results-table th,.results-table td{padding:11px 10px}.results-table td{border-bottom:1px solid #deddd3}.results-table td:first-child{font-weight:bold}.results-table td:nth-child(n+2):nth-child(-n+5){font-family:'Courier New',monospace}.results-table button{font-size:11px;padding:4px 7px;min-height:25px}.results-table a{font-size:11px}.status-label{font-size:10px;text-transform:uppercase;letter-spacing:.3px;background:#deded4;padding:3px 5px;display:inline-block}.status-label.running{color:#114528;background:#cbdccb}.status-label.error{color:#862e26;background:#eed4c7}.result-detail{margin-top:20px}.run-heading{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin-bottom:15px}.run-heading h4{font-size:16px}.run-heading .run-actions{display:flex;gap:12px;align-items:center;margin-left:auto}.run-actions button{font-size:12px}.run-actions a{font-size:12px}.run-stats{display:grid;grid-template-columns:repeat(4,1fr);border:1px solid #8d8d84;background:#f3f2e9}.run-stat{padding:13px 12px;border-right:1px solid #b8b8ac}.run-stat:last-child{border-right:0}.run-stat>span{display:block;font-family:'Courier New',monospace;font-size:10px;color:#555}.run-stat>strong{font-size:19px;font-weight:normal;display:block;margin-top:7px;font-family:'Courier New',monospace}.run-settings{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));font-size:11px;line-height:1.65;gap:5px 16px;margin:16px 0}.run-settings dt{display:inline;color:#555}.run-settings dd{display:inline;margin:0;font-weight:bold}.run-note{font-size:12px;line-height:1.6;margin-top:10px}.run-live{font-family:'Courier New',monospace;font-size:11px;background:#172c28;color:#c7e7c1;padding:13px;margin-top:14px;line-height:1.6;overflow-wrap:anywhere;max-height:140px;overflow:auto}.run-progress{height:15px;background:#f7f6ed;border:2px solid;border-color:#777 #fff #fff #777;margin:15px 0 7px}.run-progress>span{background:repeating-linear-gradient(90deg,#000080 0,#000080 8px,#c5c5c5 8px,#c5c5c5 10px);height:100%;display:block}.prose{padding:22px;font-size:12px;line-height:1.75}.prose h4{font-size:14px;margin:19px 0 8px}.prose h4:first-child{margin-top:0}.prose p+p{margin-top:10px}.source-links{padding-left:18px;margin:9px 0 0}.source-links li{margin:6px 0}.retro-dialog{padding:3px;background:var(--silver);border:2px solid;border-color:#fff #222 #222 #fff;box-shadow:6px 6px 0 #0005;max-width:95vw;min-width:280px}.retro-dialog::backdrop{background:#0005}.retro-dialog .mini-title{background:var(--navy)}.retro-dialog p{font-size:13px;margin-bottom:16px}.promotion-options{display:flex;gap:10px;margin-bottom:20px}.promotion-options button{width:54px;height:60px;padding:2px}.promotion-options img{width:44px;height:44px;display:block}.noscript{padding:20px;background:white;margin:20px auto;max-width:1136px}
@media(min-width:1300px){body{padding-top:38px}.desktop-heading{margin-bottom:25px}.play-layout{grid-template-columns:minmax(0,1.65fr) minmax(300px,1fr)}.tab-panel{padding:18px}.document-panel{padding:26px}.play-toolbar{padding-bottom:18px}}
@media(max-width:850px){body{padding:20px 12px}.desktop-caption{display:none}.play-layout{grid-template-columns:minmax(0,1.45fr) minmax(240px,1fr);gap:14px}.tab-panel{padding:12px}.play-sidebar{gap:12px}.window-content{padding:11px}.no-clock{display:none}.inline-setting{align-items:flex-start;flex-direction:column;gap:5px}.inline-setting select{max-width:none;width:100%}.player-select-row{grid-template-columns:45px 1fr;gap:5px}.player-select-row select{font-size:11px}.player-detail{font-size:9px}.move-number{display:none}.desk-note{display:none}.game-message{padding-top:13px}.document-panel{padding:20px 14px}.section-heading h2{font-size:25px}.lab-layout,.about-layout{gap:15px}.form-pair{gap:8px}.run-stats{grid-template-columns:repeat(2,1fr)}.run-stat:nth-child(2){border-right:0}.run-stat:nth-child(-n+2){border-bottom:1px solid #b8b8ac}.desktop-footer{font-size:8px;letter-spacing:.5px}.desktop-footer>span:last-child{display:none}}
@media(max-width:650px){body{padding:15px 7px}.desktop-heading{font-size:14px;gap:9px;margin:0 6px 14px}.desktop-heading>div>span{font-size:10px;margin-top:3px}.desktop-icon{font-size:37px}.program-window{box-shadow:3px 4px 0 #004e4e}.title-version{display:none}.title-bar h1{font-size:13px}.window-controls{margin-left:auto}.menu-bar{padding:0;flex-wrap:wrap;min-height:35px}.menu-bar button{font-size:11px;padding:7px 9px;min-height:33px}.manage-link{font-size:10px;padding:6px 7px}.tab-panel{padding:10px 8px}.play-toolbar{padding-bottom:12px}.toolbar-buttons{gap:8px;width:100%}.toolbar-buttons button{font-size:11px;padding:6px 10px;min-height:33px;flex:1;white-space:nowrap}.toolbar-buttons button span{margin-right:3px}.play-layout{display:flex;flex-direction:column;gap:17px}.board-surround{padding-left:18px;padding-top:7px}.player-strip{margin-left:18px;font-size:11px;padding:7px 9px;min-height:32px}.rank-labels{width:14px;font-size:10px;top:11px}.file-labels{left:22px;font-size:10px}.player-detail{font-size:10px}.chess-board{border-width:3px}.square img{width:90%;height:90%}.game-message{padding-left:18px;padding-top:11px;min-height:48px;gap:10px}.game-message strong{font-size:13px}.game-message div>span{font-size:10px}.turn-indicator{font-size:25px}.move-number{display:block;font-size:9px}.play-sidebar{display:grid;grid-template-columns:1fr;gap:14px}.player-select-row{grid-template-columns:60px 1fr;margin-bottom:9px}.player-select-row select{font-size:12px}.window-content{padding:13px}.engine-settings{margin-top:12px;padding-top:12px}.inline-setting{flex-direction:row;align-items:center}.inline-setting select{max-width:180px}.move-window{min-height:200px}.move-book{flex:none;height:160px}.desk-note{display:block;padding:1px 4px 2px}.status-bar{margin-top:5px;font-size:9px}.status-bar>span{padding:5px;min-height:23px}.status-bar>span:nth-child(2){font-size:8px;max-width:85px;white-space:nowrap;overflow:hidden}.status-bar>span.status-grip{display:none}.desktop-footer{margin:15px 4px 0;font-size:9px}.document-panel{padding:18px 10px;min-height:530px}.section-heading{gap:11px;margin-bottom:21px;align-items:flex-start;flex-wrap:wrap}.section-heading h2{font-size:24px;line-height:1.14}.section-heading>div{flex:1;min-width:210px}.section-heading p{font-size:11px;line-height:1.6}.large-pixel-icon{font-size:36px;line-height:1.1}.section-heading>button{font-size:11px;min-height:28px;padding:5px 8px}.lab-layout,.about-layout{grid-template-columns:1fr;gap:17px}.form-pair{gap:12px}.benchmark-form{padding:15px;gap:17px}.benchmark-form label{font-size:11px}.method-summary{padding:16px}.prose{padding:17px}.results-notice{font-size:10px}.results-table{font-size:11px}.results-table th,.results-table td{padding:9px}.empty-state{padding:27px 13px}.empty-state strong{font-size:13px}.empty-state p{font-size:11px}.run-heading h4{font-size:14px}.run-heading .run-actions{margin-left:0;width:100%}.run-stat{padding:12px 8px}.run-stat>strong{font-size:17px}.run-settings{grid-template-columns:1fr;gap:6px}.run-note{font-size:11px}.error-message{margin:9px 8px 0;font-size:11px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}

.board-row{display:contents}.run-method{margin-top:12px;font-size:11px;line-height:1.7}.run-method summary{cursor:pointer;color:var(--navy);text-decoration:underline}.run-method p{padding-top:8px;color:#444}
/* Fit the complete board and game status into ordinary laptop viewports. */
@media (min-width:851px) and (max-height:1000px){
  :root{--board-fit:clamp(320px,calc(100dvh - 438px),560px);--window-fit:calc(var(--board-fit) + 438px)}
  body{padding:16px 18px 12px}
  .desktop-heading,.program-window,.desktop-footer{max-width:var(--window-fit)}
  .desktop-heading{margin-bottom:12px;font-size:15px;gap:10px}
  .desktop-heading>div>span{font-size:10px;margin-top:3px}
  .desktop-icon{font-size:37px}
  .desktop-caption{font-size:9px}
  .tab-panel{padding:12px}
  .play-toolbar{padding-bottom:12px}
  .play-layout{grid-template-columns:minmax(0,calc(var(--board-fit) + 22px)) minmax(280px,1fr);gap:20px}
  .player-strip{min-height:30px;padding:6px 9px}
  .player-detail{font-size:9px}
  .board-surround{padding-top:6px}
  .rank-labels{top:10px}
  .game-message{min-height:48px;padding-top:10px;gap:9px}
  .game-message strong{font-size:13px}
  .game-message div>span{font-size:10px}
  .turn-indicator{font-size:25px}
  .move-number{font-size:9px}
  .play-sidebar{gap:13px}
  .move-window{min-height:155px}
  .desk-note{display:none}
  .status-bar{margin-top:6px}
  .desktop-footer{margin-top:12px;font-size:8px}
  .document-panel{padding:20px;min-height:0}
}