/* ChessViz — chessviz.css  V3.6  2026-08-03 */

:root{
  --bg:#12141a;
  --bg2:#181b23;
  --line:#272b36;
  --fg:#e7e9ef;
  --dim:#9aa1b2;
  --faint:#666e82;
  --light:#e9e2d4;
  --dark:#8a9b83;
  --white:#f4b942;   /* white's control */
  --black:#6d7fd6;   /* black's control */
  --accent:#4fd1a5;
  --book:#c07de0;   /* his book moves */
}

*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  background:var(--bg);
  color:var(--fg);
  font:14px/1.45 ui-sans-serif,system-ui,"Segoe UI",Roboto,sans-serif;
  -webkit-font-smoothing:antialiased;
}

/* fill the viewport exactly, so the page itself never scrolls */
html,body{height:100%;overflow:hidden}
.wrap{
  max-width:1240px;margin:0 auto;padding:18px 20px 16px;
  height:100%;display:flex;flex-direction:column;
}

.top h1{margin:0;font-size:22px;letter-spacing:.5px;font-weight:650}
.top .ver{
  font-size:11px;font-weight:600;letter-spacing:.5px;color:var(--accent);
  border:1px solid #2a4a3e;background:#16241f;border-radius:5px;
  padding:2px 6px;margin-left:8px;vertical-align:3px;
}
.top .ver span{color:var(--faint);font-weight:400;margin-left:5px}
.top .creed{
  margin:7px 0 2px;color:var(--accent);
  font-size:15px;font-weight:600;letter-spacing:.2px;
}
.top .tag{margin:2px 0 18px;color:var(--dim);font-size:13px}

/* ---------- standard menu ---------- */

.top{position:relative}
/* Kaleidoscope's menu look — one bordered panel, borderless items inside,
   blue-violet hover — but always on show rather than behind a hamburger. */
#menuPanel{
  position:absolute;top:0;right:0;z-index:60;
  background:#1f1f1f;border:1px solid #3a3a3a;border-radius:6px;
  display:flex;flex-wrap:wrap;justify-content:flex-end;overflow:hidden;
  box-shadow:0 6px 20px rgba(0,0,0,.5);
}
.menu-item{
  background:none;border:none;color:#ccc;text-align:left;
  padding:9px 14px;font-family:inherit;font-size:.85rem;
  cursor:pointer;text-decoration:none;white-space:nowrap;
}
.menu-item:hover{background:#383858;color:#aaf}

.modal{
  position:fixed;inset:0;z-index:200;
  background:rgba(8,10,14,.72);
  display:flex;align-items:center;justify-content:center;padding:24px;
}
.modal.hidden{display:none}
.modal-box{
  background:var(--bg2);border:1px solid var(--line);border-radius:14px;
  padding:26px 26px 20px;max-width:520px;width:100%;
  max-height:82vh;overflow-y:auto;
  box-shadow:0 20px 60px rgba(0,0,0,.6);
}
.modal-box h2{margin:0 0 14px;font-size:19px;font-weight:650;color:var(--fg)}
.modal-box p{margin:0 0 12px;font-size:13.5px;line-height:1.65;color:var(--dim)}
.modal-box em{color:var(--accent);font-style:normal;font-weight:600}
.modal-box a{color:var(--accent)}
.modal-meta{
  margin-top:16px;padding-top:12px;border-top:1px solid var(--line);
  font-size:12px;color:var(--faint);line-height:1.6;
}
.modal-close{margin-top:16px;padding:7px 22px;font-size:13px}

/* the whole tool should sit in one viewport — board pinned, panel scrolls itself */
.stage{
  display:grid;grid-template-columns:minmax(0,1fr) 330px;gap:22px;align-items:start;
  flex:1;min-height:0;
}
.boardpane{min-width:0;height:100%;display:flex;flex-direction:column}
.panel{height:100%;overflow-y:auto;padding-right:5px}
.panel::-webkit-scrollbar{width:9px}
.panel::-webkit-scrollbar-thumb{background:#2b3040;border-radius:5px}
.panel::-webkit-scrollbar-track{background:transparent}

/* ---------- board ---------- */

.boardframe{
  display:grid;
  grid-template-columns:20px minmax(0,1fr);
  grid-template-rows:minmax(0,1fr) 20px;
  gap:4px;
  /* square overall (20px strip + 4px gap on each axis), so the board cell is
     square and the coordinate strips line up with it at any window size */
  flex:1;min-height:0;
  aspect-ratio:1/1;
  align-self:center;
  width:auto;max-width:100%;
  margin:0 auto;
}
.boardbox{position:relative;aspect-ratio:1/1;width:100%}
.board{
  position:absolute;inset:0;
  display:grid;
  /* minmax(0,1fr), or the glyphs set a floor and the last file overflows */
  grid-template-columns:repeat(8,minmax(0,1fr));
  grid-template-rows:repeat(8,minmax(0,1fr));
  border-radius:5px;overflow:hidden;
  box-shadow:0 10px 34px rgba(0,0,0,.45);
  container-type:size;   /* lets the pieces scale off the board, not the viewport */
}
.overlay{position:absolute;inset:0;pointer-events:none;z-index:5}

.sq{position:relative;display:flex;align-items:center;justify-content:center;cursor:pointer}
.sq.l{background:var(--light)}
.sq.d{background:var(--dark)}

.cov,.cov2{position:absolute;inset:0;pointer-events:none}

/* Drawn pieces, not text. Both sides share the same geometry — only fill and
   stroke swap — so a white knight and a black knight are the same animal. */
.man{
  position:absolute;inset:9%;z-index:3;
  display:flex;align-items:center;justify-content:center;
  pointer-events:none;transition:opacity .12s;
}
.piece{width:100%;height:100%;display:block;overflow:visible;
  filter:drop-shadow(0 1px 2px rgba(0,0,0,.45))}
.piece path,.piece circle{
  fill:var(--pf);stroke:var(--ps);
  stroke-width:1.7;stroke-linejoin:round;stroke-linecap:round;
}
.piece .line{fill:none;stroke-width:1.5}
.piece .dot{fill:var(--ps);stroke:none}
.piece .inlay{fill:var(--ps);stroke:none}   /* cut into the piece, not sat on it */
/* one red chosen to read on both a white and a black king */
.piece .trim{fill:#d4413a;stroke:none}
/* the king stands a little taller than the rest of the set */
.piece.tk{transform:scale(1.09);transform-origin:50% 58%}
.piece.w{--pf:#f6f6f3;--ps:#12141a}
.piece.b{--pf:#16181d;--ps:#f2f4f8}
.board.nopieces .man{opacity:0}

.sq .cnt{position:absolute;z-index:4;font-size:1.9cqw;font-weight:700;pointer-events:none;opacity:.85}
.sq .cnt.w{left:3px;bottom:1px;color:#7a4a00}
.sq .cnt.b{right:3px;top:1px;color:#1d2450}

/* Numbers mode: the digit is the indicator, so it has to carry the square */
.sq.bignum .cnt{
  font-size:4.2cqw;opacity:1;
  paint-order:stroke;-webkit-text-stroke:3px rgba(14,16,21,.72);
}
.sq.bignum .cnt.w{color:#ffc85a;left:4px;bottom:2px}
.sq.bignum .cnt.b{color:#a9b6ff;right:4px;top:2px}

/* king under attack — a red ring, and a solid one when it is over */
.sq.check{box-shadow:inset 0 0 0 4px #ff4d4d, inset 0 0 22px rgba(255,77,77,.55);z-index:1}
.sq.mate{
  box-shadow:inset 0 0 0 4px #ff2d2d, inset 0 0 30px rgba(255,45,45,.8);
  background:#8c1f1f !important;z-index:1;
  animation:mateflash 1.1s ease-in-out infinite;
}
@keyframes mateflash{0%,100%{filter:none}50%{filter:brightness(1.45)}}

.sq.hot{outline:2px solid var(--accent);outline-offset:-2px;z-index:2}
.sq.pin{outline:2px solid #fff;outline-offset:-2px;z-index:2}

.coords{display:flex;color:var(--faint);font-size:11px;letter-spacing:.5px}
.coords.ranks{flex-direction:column;justify-content:space-around;align-items:center}
.coords.files{grid-column:2;justify-content:space-around;align-items:center}
/* NOT the global .hidden — that sets display:none, which drops the strips out of
   the grid and collapses the board to 20px. Coords must only go invisible. */
.coords.off{visibility:hidden}

/* ---------- transport ---------- */

.transport{display:flex;align-items:center;gap:7px;margin-top:14px}
.transport input[type=range]{flex:1;min-width:60px}
.plycount{color:var(--dim);font-size:12px;font-variant-numeric:tabular-nums;min-width:64px;text-align:right}

button{
  background:var(--bg2);color:var(--fg);border:1px solid var(--line);
  border-radius:6px;padding:6px 11px;font:inherit;font-size:13px;cursor:pointer;
}
button:hover{border-color:#3a4055;background:#1f2330}
button.play{color:var(--accent)}
button.wide{flex:1}

.status{margin-top:12px;color:var(--dim);font-size:12.5px;min-height:20px}
.status b{color:var(--fg);font-weight:600}
.status .chk{color:#ff6b6b;font-weight:600}
.status .err{color:#ff8080}

/* ---------- panel ---------- */

.panel{display:flex;flex-direction:column;gap:12px}
.card{background:var(--bg2);border:1px solid var(--line);border-radius:9px;padding:12px 13px}
.card.grow{flex:0 0 auto}   /* the panel scrolls; a growing card fights that and overlaps */
.cardhead{font-size:11px;text-transform:uppercase;letter-spacing:1.1px;color:var(--faint);margin-bottom:9px}

.card.demo{border-color:#2f5546;background:#141d1a}
.card.demo.run{border-color:var(--accent)}
.demobody{font-size:12.5px;color:var(--dim);line-height:1.55;margin-bottom:10px}
.demobody b{color:var(--fg)}
.demobody em{color:var(--accent);font-style:normal;font-weight:600}

.demodrill{
  font-size:12px;line-height:1.5;color:var(--dim);
  background:#0f1a16;border-left:2px solid var(--accent);
  border-radius:0 5px 5px 0;padding:7px 9px;margin:0 0 10px;
}
.demodrill b{color:var(--accent)}

.democtl{margin-top:9px;padding-top:8px;border-top:1px solid #24382f}
.democtl .tog{padding:2px 0;font-size:12.5px}
.democtl .slider{padding:3px 0;font-size:12px}
.democtl select{margin:3px 0 5px;font-size:12px;padding:4px 6px}
.democtl .slider select{width:auto;flex:0 0 auto;margin:0}
.demoeta{color:var(--faint);font-size:11px;margin-top:2px}
.demoprog{height:3px;border-radius:2px;background:#0f1116;overflow:hidden;margin-top:7px}
.demoprog span{display:block;height:100%;width:0;background:var(--accent);transition:width .25s linear}
#demoPlay{min-width:74px}
.card.demo.speaking .cardhead{color:var(--accent)}

.gameinfo{font-size:12.5px;color:var(--dim);margin-bottom:10px;line-height:1.5}
.gameinfo b{color:var(--fg)}

.row{display:flex;gap:7px}
.hint{color:var(--faint);font-size:11.5px;margin-top:8px}

.tog{display:flex;align-items:center;gap:8px;padding:4px 0;font-size:13px;cursor:pointer}
.tog.sub{padding-left:16px;color:var(--dim);font-size:12.5px}
.tog input{accent-color:var(--accent);cursor:pointer}

.slider{display:flex;align-items:center;gap:8px;font-size:12.5px;color:var(--dim);padding:5px 0}
.slider.sub{padding-left:16px}
.slider input{flex:1;min-width:40px;accent-color:var(--accent)}
.slider b{color:var(--fg);font-variant-numeric:tabular-nums}

.seg{display:flex;gap:4px;margin-bottom:6px}
.seg button{flex:1;padding:5px 2px;font-size:12px}
.seg button.on{background:#2a3040;border-color:#49506a;color:#fff}

.legend{display:flex;align-items:center;gap:7px;font-size:11px;color:var(--faint);margin-top:8px}
.legend .bar{flex:1;height:8px;border-radius:4px}

.libcount{color:var(--faint);text-transform:none;letter-spacing:0;font-size:11px}

.filterlab{font-size:10.5px;text-transform:uppercase;letter-spacing:1px;color:var(--faint);margin:7px 0 4px}
.seg button i{font-style:normal;opacity:.55;font-size:10.5px;margin-left:3px;font-variant-numeric:tabular-nums}
.seg button.on i{opacity:.8}
.seg button.empty{opacity:.4}
.seg.wrap{flex-wrap:wrap;margin-top:6px}
.seg.wrap button{flex:0 0 auto;min-width:46px}

.breakdown{
  display:grid;grid-template-columns:auto repeat(3,1fr);gap:2px 8px;
  font-size:11.5px;color:var(--dim);font-variant-numeric:tabular-nums;
  margin:-4px 0 9px;padding:8px 2px 0;border-top:1px solid var(--line);
}
.breakdown .h{color:var(--faint);font-size:10px;text-transform:uppercase;letter-spacing:.8px}
.breakdown .r{color:var(--faint)}
.breakdown b{color:var(--fg);font-weight:600}
.breakdown .pc{color:var(--faint);font-size:10.5px}

.booklist{margin-top:6px;font-size:12px;font-variant-numeric:tabular-nums}
.booklist .bm{
  display:grid;grid-template-columns:52px 1fr 44px;gap:7px;align-items:center;
  padding:3px 0;
}
.booklist .san{color:var(--fg);font-weight:600}
.booklist .san.played{color:var(--book)}
.booklist .track{position:relative;height:13px;border-radius:3px;background:#0f1116;overflow:hidden}
.booklist .fill{position:absolute;inset:0 auto 0 0;background:var(--book);opacity:.55}
.booklist .wdl{position:absolute;inset:0;display:flex;font-size:9.5px;line-height:13px}
.booklist .wdl i{font-style:normal;text-align:center;overflow:hidden}
.booklist .wdl .win{background:rgba(79,209,165,.55)}
.booklist .wdl .draw{background:rgba(120,128,150,.4)}
.booklist .wdl .loss{background:rgba(255,107,107,.45)}
.booklist .n{color:var(--dim);text-align:right;font-size:11px}
.booklist .none{color:var(--faint);font-size:11.5px;padding:4px 0}
.booklist .sum{color:var(--faint);font-size:11px;margin-top:6px;border-top:1px solid var(--line);padding-top:6px}

input[type=search]{
  width:100%;background:#0f1116;color:var(--fg);border:1px solid var(--line);
  border-radius:6px;padding:6px 9px;font:inherit;font-size:12.5px;margin-bottom:7px;
}
input[type=search]:focus{outline:none;border-color:var(--accent)}

.suggest{display:flex;flex-wrap:wrap;gap:4px;align-items:center;margin:0 0 7px}
.suggest.hidden{display:none}
.suggest .n{color:var(--dim);font-size:11.5px;margin-right:3px}
.suggest .n b{color:var(--accent);font-variant-numeric:tabular-nums}
.suggest .chip{padding:2px 7px;font-size:11.5px;border-radius:11px;line-height:1.5}
.suggest .chip i{font-style:normal;color:var(--faint);font-size:10.5px;margin-left:2px}
.suggest .more{color:var(--faint);font-size:11px}

.gamelist{
  max-height:230px;overflow:auto;margin:2px 0 9px;
  border:1px solid var(--line);border-radius:6px;background:#0f1116;
}
.gamelist .g{
  display:grid;grid-template-columns:38px 1fr 34px;gap:6px;align-items:baseline;
  padding:5px 8px;cursor:pointer;border-bottom:1px solid #16191f;font-size:12px;
  white-space:nowrap;
}
.gamelist .g:last-child{border-bottom:none}
.gamelist .g:hover{background:#1a1e28}
.gamelist .g.cur{background:#233029}
.gamelist .g.tagged .yr::after{content:'\2605';color:var(--book);margin-left:3px;font-size:9px;vertical-align:1px}
.gamelist .yr{color:var(--faint);font-variant-numeric:tabular-nums}
.gamelist .vs{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.gamelist .vs .me{color:var(--accent)}
.gamelist .res{color:var(--dim);font-size:11px;text-align:right;font-variant-numeric:tabular-nums}
.gamelist .res.win{color:var(--accent)}
.gamelist .res.loss{color:#ff8080}
.gamelist .res.draw{color:var(--faint)}
.gamelist .none{padding:12px;color:var(--faint);text-align:center;font-size:12px;line-height:1.6}
.gamelist .none b{color:var(--fg)}
.gamelist .none button{display:block;margin:8px auto 0;font-size:11.5px;padding:4px 10px}
.gamelist .more{padding:7px;color:var(--faint);text-align:center;font-size:11px}

.moves{
  max-height:220px;overflow:auto;font-size:13px;
  font-variant-numeric:tabular-nums;
}
.moves .mv{display:grid;grid-template-columns:30px 1fr 1fr;gap:3px;padding:1px 0}
.moves .no{color:var(--faint);font-size:12px}
.moves .san{padding:1px 5px;border-radius:4px;cursor:pointer}
.moves .san:hover{background:#242938}
.moves .san.cur{background:var(--accent);color:#0d1014;font-weight:600}

.keys{color:var(--faint);font-size:11px;text-align:center;padding:2px 0}

textarea{
  width:100%;height:110px;margin-top:8px;resize:vertical;
  background:#0f1116;color:var(--fg);border:1px solid var(--line);
  border-radius:6px;padding:8px;font:12px/1.4 ui-monospace,Consolas,monospace;
}
select{
  width:100%;margin-bottom:8px;background:#0f1116;color:var(--fg);
  border:1px solid var(--line);border-radius:6px;padding:6px;font:inherit;font-size:12.5px;
}
.hidden{display:none}

/* ---------- drop ---------- */

.dropveil{
  position:fixed;inset:0;display:none;z-index:50;
  background:rgba(10,12,16,.88);
  align-items:center;justify-content:center;
  font-size:19px;color:var(--accent);
}
.dropveil.on{display:flex}
.dropveil div{border:2px dashed var(--accent);border-radius:14px;padding:40px 60px}

/* Wide screens have room to spare: widen the shell and flow the control cards
   into two columns so nothing needs scrolling to reach. */
@media (min-width:1440px){
  .wrap{max-width:1800px}
  .stage{grid-template-columns:minmax(0,1fr) 700px}
  /* overflow stays auto: better to scroll a little than to clip a card away */
  .panel{display:block;column-count:2;column-gap:14px;padding-right:4px}
  .panel > *{
    break-inside:avoid;-webkit-column-break-inside:avoid;
    margin-bottom:12px;display:block;
  }
  .gamelist{max-height:168px}
  .moves{max-height:150px}
  .breakdown{margin-bottom:6px}
}

/* three columns once there is genuinely room — the whole console at a glance */
@media (min-width:1700px){
  .stage{grid-template-columns:minmax(0,1fr) 1030px}
  .panel{column-count:3}
  .gamelist{max-height:200px}
  .moves{max-height:190px}
}

@media (max-width:940px){
  html,body{overflow:auto}
  .wrap{height:auto}
  .stage{grid-template-columns:minmax(0,1fr);height:auto}
  .boardpane,.panel{height:auto}
  .boardframe{max-width:100%}
  .panel{overflow:visible}
}