:root{color-scheme:dark;font-family:Inter,system-ui,sans-serif;background:#101319;color:#edf1f7}*{box-sizing:border-box}body{margin:0}main{max-width:1140px;margin:auto;padding:28px 36px}header{display:flex;align-items:center;justify-content:space-between;padding-bottom:30px}.brand{font-size:29px;letter-spacing:-1px;font-weight:800;color:white;text-decoration:none}.brand span{color:#e8a452;margin-left:8px}.badge,.eyebrow,.label{font-size:12px;letter-spacing:1.6px;font-weight:700;color:#a0a9ba}.badge{border:1px solid #303744;border-radius:30px;padding:9px 13px}.layout{display:grid;grid-template-columns:minmax(0,620px) minmax(280px,1fr);gap:48px}.player{display:flex;justify-content:space-between;padding:16px 0;font-size:14px;color:#a5afbf}.player b{color:#edf1f7;font-size:16px}#board{display:grid;grid-template-columns:repeat(8,1fr);aspect-ratio:1;border:8px solid #303d3b;border-radius:5px;overflow:hidden;box-shadow:0 15px 60px #0005}.square{position:relative;border:0;border-radius:0;padding:0;aspect-ratio:1;background:#e6dfd1;display:flex;align-items:center;justify-content:center;cursor:pointer}.square.dark{background:#77918c}.piece{font-family:'DejaVu Sans','Arial Unicode MS',serif;font-size:clamp(25px,4.9vw,57px);line-height:1;user-select:none;pointer-events:none}.piece.white{color:#fff;text-shadow:0 2px 2px #000,1px 0 #182433,-1px 0 #182433}.piece.black{color:#111a25;text-shadow:0 1px 1px #d2dce6}.square.selected{background:#e8a452}.square.last{box-shadow:inset 0 0 0 4px #edbe6499}.square.target:after{content:'';width:20%;height:20%;position:absolute;border-radius:50%;background:#13233355}.square:focus-visible{outline:4px solid #efaa53;outline-offset:-4px}.coord{position:absolute;font-size:11px;font-weight:700;left:4px;top:3px;color:#344e48}.file{top:auto;bottom:2px;left:auto;right:4px}aside{padding-top:17px}h1{font-size:clamp(30px,3.2vw,43px);line-height:1.12;letter-spacing:-1.4px;margin:14px 0 18px}.eyebrow{color:#e8a452}.intro,.note{color:#a5afbf;line-height:1.6;font-size:15px}.statusbox{border-left:3px solid #e8a452;background:#1b2029;padding:17px 18px;margin-top:25px}#status{margin:9px 0 0;font-weight:600;font-size:17px}#progress{font-size:13px;color:#a5afbf;margin-top:6px}.analysis{margin:26px 0}.analysis>div{display:flex;justify-content:space-between;border-bottom:1px solid #2a303b;padding:13px 0;font-size:15px}.worst strong{color:#e8a452}.analysis p{font-size:13px;color:#a5afbf;line-height:1.5}.primary{width:100%;background:#e8a452;color:#16191f;border:0;border-radius:5px;font:700 16px system-ui;padding:14px;cursor:pointer}.primary:hover{background:#f5b96c}.depth{display:flex;justify-content:space-between;align-items:center;margin:16px 0 24px;font-size:14px;color:#a5afbf}select{background:#1c222c;color:#edf1f7;border:1px solid #394354;border-radius:4px;padding:8px;font-size:14px}.history{border-top:1px solid #303744;padding-top:18px}#moves{font-size:14px;line-height:1.9;max-height:110px;overflow:auto;margin-top:9px;color:#ced5df;word-spacing:6px}.note{font-size:13px;margin-top:20px}footer{border-top:1px solid #272e39;margin-top:30px;padding-top:18px;font-size:12px;color:#8590a1}a{color:#a5afbf}dialog{background:#202734;color:white;border:1px solid #556273;border-radius:8px}dialog::backdrop{background:#0009}#choices{display:flex;gap:8px}#choices button{font-size:35px;padding:10px 15px;cursor:pointer}@media(max-width:780px){main{padding:16px}.layout{grid-template-columns:1fr;gap:12px}.badge{font-size:9px;letter-spacing:1px}header{padding-bottom:10px}.play{max-width:620px;width:100%;margin:auto}.piece{font-size:clamp(25px,8vw,57px)}aside{padding-top:10px}h1{font-size:31px}h1 br{display:none}.statusbox{margin-top:16px}.analysis{margin:18px 0}}

/* Fixed piece assets keep both sides consistent across devices. */
.piece{width:88%;height:88%;object-fit:contain;user-select:none;pointer-events:none;filter:drop-shadow(0 2px 1px #0003)}.square.dark .coord{color:#f4efe3}.square.selected{background:#dbb670}.square.last{box-shadow:inset 0 0 0 4px #d4ab62bb}

/* Keep the complete board usable on short desktop viewports and at browser zoom. */
@media (min-width:781px){
  main{
    --board-size:min(620px,calc(100vw - 420px),calc(100vh - 130px));
    --board-size:min(620px,calc(100vw - 420px),calc(100dvh - 130px));
  }
  .layout{
    grid-template-columns:minmax(0,calc(var(--board-size) + clamp(0px,2vw,32px))) minmax(280px,1fr);
    gap:clamp(24px,4vw,48px);
    align-items:start;
  }
  .play{width:var(--board-size);min-width:0;justify-self:center}
}

@media (min-width:781px) and (max-height:800px){
  main{padding-top:14px;padding-bottom:14px}
  header{padding-bottom:12px}
  .brand{font-size:25px}
  .player{padding:6px 0}
  aside{padding-top:0}
  h1{font-size:clamp(28px,3vw,38px);margin:8px 0 12px}
  .intro{font-size:14px;margin:0}
  .statusbox{margin-top:14px;padding:13px 15px}
  .analysis{margin:16px 0}
  .analysis>div{padding:9px 0}
  .analysis p{margin-bottom:10px}
  .primary{padding:12px}
  .depth{margin:11px 0 15px}
  .history{padding-top:13px}
  #moves{max-height:72px;line-height:1.65}
  .note{margin-top:12px;line-height:1.45}
  footer{margin-top:18px;padding-top:12px}
}

/* On wide screens the board itself sits on the viewport's horizontal centerline. */
@media (min-width:1200px){
  main{max-width:none}
  .layout{
    grid-template-columns:minmax(0,1fr) var(--board-size) minmax(0,1fr);
    gap:clamp(20px,2.5vw,32px);
  }
  .play{
    grid-column:2;
    justify-self:center;
    position:relative;
    margin-top:clamp(21px,4vh,40px);
  }
  .play>.player{
    position:absolute;
    right:calc(100% + clamp(24px,3vw,44px));
    width:clamp(180px,16vw,230px);
    padding:14px 16px;
    flex-direction:column;
    align-items:flex-start;
    justify-content:center;
    gap:4px;
    background:#151a22;
    border-left:3px solid #e8a452;
    border-radius:4px;
  }
  .play>.player:first-child{top:0}
  .play>.player:last-child{bottom:0}
  .play>.player span:last-child{font-size:13px}
  aside{grid-column:3;min-width:0}
}

@media (min-width:1200px) and (max-height:800px){
  .play{transform:none;margin-top:21px}
  .play>.player{padding:11px 14px}
}

[hidden]{display:none!important}

/* Bot selection screen. */
.chooser{min-height:100vh;min-height:100dvh;max-width:1180px;margin:auto;padding:28px 36px;display:flex;flex-direction:column}
.chooser-body{flex:1;display:grid;grid-template-columns:minmax(260px,.75fr) minmax(520px,1.25fr);align-items:center;gap:64px;padding:36px 0 64px}
.chooser-copy h1{font-size:clamp(42px,5vw,68px);line-height:1.02;margin:14px 0 22px;letter-spacing:-2px}
.chooser-copy p{max-width:470px;color:#a5afbf;font-size:17px;line-height:1.7}
.bot-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}
.bot-card{position:relative;min-height:350px;padding:30px 26px;border:1px solid #303744;border-radius:8px;background:#171c24;color:#edf1f7;text-align:left;font:inherit;cursor:pointer;display:flex;flex-direction:column;align-items:flex-start;overflow:hidden;transition:transform .18s ease,border-color .18s ease,background .18s ease}
.bot-card:before{content:'';position:absolute;inset:0 0 auto;height:4px;background:#e8a452;transform:scaleX(0);transform-origin:left;transition:transform .18s ease}
.bot-card.second:before{background:#88a8a2}
.bot-card:hover{transform:translateY(-5px);border-color:#e8a452;background:#1b212b}
.bot-card.second:hover{border-color:#88a8a2}
.bot-card:hover:before,.bot-card:focus-visible:before{transform:scaleX(1)}
.bot-card:focus-visible{outline:3px solid #efaa53;outline-offset:3px}
.bot-number{position:absolute;right:22px;top:20px;font:700 13px ui-monospace,monospace;color:#596475}
.bot-difficulty{font-size:11px;letter-spacing:1.8px;font-weight:800;color:#e8a452;margin-bottom:50px}
.bot-card.second .bot-difficulty{color:#9bbab4}
.bot-card strong{font-size:29px;letter-spacing:-.7px;margin-bottom:10px}
.bot-rule{font-size:16px;font-weight:700;margin-bottom:14px}
.bot-description{font-size:14px;line-height:1.6;color:#a5afbf}
.bot-cta{margin-top:auto;padding-top:28px;font-size:14px;font-weight:800;color:#e8a452}
.bot-card.second .bot-cta{color:#a9c9c3}
.chooser>footer{margin-top:0}

.game-actions{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:10px}
.secondary{background:transparent;color:#cbd3df;border:1px solid #394354;border-radius:5px;font:700 14px system-ui;padding:0 16px;cursor:pointer}
.secondary:hover{border-color:#e8a452;color:#fff}
.secondary:focus-visible,.primary:focus-visible{outline:3px solid #efaa53;outline-offset:3px}

@media (min-width:781px) and (max-height:800px){
  .chooser{padding-top:14px;padding-bottom:14px}
  .chooser-body{padding:8px 0 22px;gap:44px}
  .chooser-copy h1{font-size:clamp(38px,4.4vw,56px);margin:9px 0 14px}
  .chooser-copy p{font-size:15px;line-height:1.55}
  .bot-card{min-height:278px;padding:23px 20px}
  .bot-difficulty{margin-bottom:32px}
  .bot-card strong{font-size:25px}
  .bot-cta{padding-top:18px}
}

@media (max-width:780px){
  .chooser{padding:16px}
  .chooser header{padding-bottom:28px}
  .chooser-body{display:block;padding:22px 0 34px}
  .chooser-copy h1{font-size:38px}
  .chooser-copy h1 br{display:none}
  .chooser-copy p{font-size:15px}
  .bot-grid{grid-template-columns:1fr;margin-top:30px}
  .bot-card{min-height:270px}
  .game-actions{grid-template-columns:1fr}
  .secondary{padding:12px}
}

/* Video-rule bots and their in-game guidance. */
.bot-grid .bot-card{min-height:290px}
.bot-card.buddhism:before,.bot-card.islam:before{background:#d2b96f}
.bot-card.buddhism:hover,.bot-card.islam:hover{border-color:#d2b96f}
.bot-card.buddhism .bot-difficulty,.bot-card.islam .bot-difficulty{color:#d2b96f}
.bot-card.buddhism strong,.bot-card.islam strong{font-size:23px;line-height:1.15}
.bot-card.buddhism .bot-cta,.bot-card.islam .bot-cta{color:#d2b96f}

.rules-panel{margin:20px 0 8px;border:1px solid #303744;border-radius:6px;background:#151a22;padding:16px 17px}
.rules-panel ul{list-style:none;padding:0;margin:12px 0 8px;display:grid;gap:8px}
.rules-panel li{display:flex;align-items:flex-start;gap:9px;color:#a5afbf;font-size:13px;line-height:1.35}
.rules-panel li span{display:grid;place-items:center;flex:0 0 20px;height:20px;border:1px solid #485364;border-radius:50%;font:700 11px ui-monospace,monospace}
.rules-panel li.done{color:#d7dde7}
.rules-panel li.done span{color:#101319;background:#d2b96f;border-color:#d2b96f}
.rules-panel p{margin:10px 0 0;color:#8f99a9;font-size:12px;line-height:1.45}

.video-card{display:block;margin-top:14px;border:1px solid #303744;border-radius:6px;overflow:hidden;background:#151a22;color:#edf1f7;text-decoration:none;transition:border-color .18s ease,transform .18s ease}
.video-card:hover{border-color:#e8a452;transform:translateY(-2px)}
.video-card:focus-visible{outline:3px solid #efaa53;outline-offset:3px}
.video-card img{display:block;width:100%;aspect-ratio:16/9;object-fit:cover}
.video-card>span{display:flex;flex-direction:column;gap:3px;padding:11px 12px}
.video-card b{font-size:13px}
.video-card small{color:#9da7b7;font-size:11px}

@media (min-width:781px) and (max-width:1080px){
  .chooser-body{grid-template-columns:1fr;gap:24px;align-content:center}
  .chooser-copy p{max-width:720px}
  .bot-grid .bot-card{min-height:260px}
}

@media (min-width:1200px){
  .play>.video-card{
    position:absolute;
    right:calc(100% + clamp(24px,3vw,44px));
    top:50%;
    transform:translateY(-50%);
    width:clamp(180px,16vw,230px);
    margin:0;
  }
  .play>.video-card:hover{transform:translateY(calc(-50% - 2px))}
}

@media (min-width:781px) and (max-height:800px){
  .bot-grid .bot-card{min-height:235px}
  .bot-card.buddhism strong,.bot-card.islam strong{font-size:20px}
  .rules-panel{margin-top:12px;padding:12px 14px}
  .rules-panel ul{gap:5px;margin:8px 0 5px}
  .rules-panel p{margin-top:7px}
}

.bot-card.dual{grid-column:1/-1;min-height:220px}
.bot-card.dual:before{background:#779fca}
.bot-card.dual:hover{border-color:#779fca}
.bot-card.dual .bot-difficulty,.bot-card.dual .bot-cta{color:#94b9df}

.dual-shell{max-width:1480px;margin:auto;padding:24px 32px 30px}
.dual-heading{display:grid;grid-template-columns:minmax(0,1fr) minmax(320px,430px);gap:42px;align-items:start;margin-bottom:24px}
.dual-heading h1{margin:8px 0 10px;font-size:clamp(34px,4vw,54px)}
.dual-heading>div>p{color:#a5afbf;line-height:1.6;max-width:700px;margin:0}
.dual-controls{border-left:3px solid #779fca;background:#1b2029;padding:14px 16px}
.dual-controls>p{margin:0 0 12px;font-weight:650;line-height:1.4}
.dual-controls>div{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:8px}
.dual-controls .primary{padding:11px}
.dual-controls .secondary{padding:0 14px}
.dual-video{display:grid;grid-template-columns:126px minmax(0,1fr);align-items:center;margin-top:12px}
.dual-video img{height:100%;aspect-ratio:16/9}
.dual-layout{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:clamp(20px,3vw,44px);align-items:start}
.dual-game{min-width:0}
.dual-game .player{padding:9px 2px}
.dual-board{display:grid;grid-template-columns:repeat(8,1fr);aspect-ratio:1;border:7px solid #303d3b;border-radius:5px;overflow:hidden;box-shadow:0 15px 60px #0005}
.dual-board.finished{opacity:.62;filter:saturate(.65)}
.dual-moves{font-size:12px;line-height:1.7;min-height:42px;max-height:66px;overflow:auto;color:#a5afbf;border-top:1px solid #2a303b;padding-top:8px}
.dual-shell>footer{margin-top:24px}

@media (max-width:900px){
  .dual-shell{padding:16px}
  .dual-heading{grid-template-columns:1fr;gap:20px}
  .dual-layout{grid-template-columns:1fr;max-width:650px;margin:auto}
  .bot-card.dual{grid-column:auto}
}

@media (max-width:520px){
  .dual-controls>div{grid-template-columns:1fr}
  .dual-controls .secondary{padding:11px}
  .dual-video{grid-template-columns:105px minmax(0,1fr)}
}

/* Board annotations: right-click highlights and right-drag arrows. */
.board-wrap{position:relative;width:100%;aspect-ratio:1;user-select:none}
#board,.dual-board{width:100%;height:100%;aspect-ratio:auto}
.board-draw{position:absolute;inset:0;width:100%;height:100%;pointer-events:none;z-index:4}