:root{
  color-scheme:light dark;
  --bg:#f5f6f8;--panel:#fff;--text:#222;--muted:#68707a;--bd:#d7dbe0;
  --accent:#2563eb;--ok:#167a3f;--warn:#a15c00;--danger:#c62828;
  --hint:#6d4cc2;--soft:#eef2f7
}
@media(prefers-color-scheme:dark){
  :root{
    --bg:#111418;--panel:#1a1f25;--text:#eef1f4;--muted:#a7b0bb;--bd:#37404a;
    --accent:#79a7ff;--ok:#70d890;--warn:#ffbd62;--danger:#ff7b7b;
    --hint:#b49bff;--soft:#20262e
  }
}
*{box-sizing:border-box}
body{
  margin:0;background:var(--bg);color:var(--text);
  font-family:system-ui,-apple-system,"Segoe UI","Yu Gothic UI","Meiryo",sans-serif
}
.wrap{max-width:1480px;margin:auto;padding:24px;position:relative}
.panel{background:var(--panel);border:1px solid var(--bd);border-radius:14px}
h1{font-size:24px;margin:0 0 6px}
.lead{margin:0 0 18px;color:var(--muted);line-height:1.6}
.drop{
  padding:32px;text-align:center;border:2px dashed var(--bd);cursor:pointer;transition:.15s
}
.drop.drag{border-color:var(--accent);background:color-mix(in srgb,var(--accent) 7%,transparent)}
.drop b{display:block;font-size:18px;margin-bottom:6px}
.drop span{color:var(--muted)}
body.loaded h1{padding-right:270px}
body.loaded .drop{
  position:absolute;top:18px;right:24px;z-index:20;
  width:238px;min-height:58px;padding:8px 13px;
  border-width:2px;border-radius:10px;
  display:flex;flex-direction:column;justify-content:center;
  box-shadow:0 2px 10px rgba(0,0,0,.08)
}
body.loaded .drop b{display:block;font-size:13px;margin:0 0 2px;white-space:nowrap}
body.loaded .drop span{display:block;font-size:11px;line-height:1.3;white-space:nowrap}
@media(max-width:720px){
  body.loaded h1{padding-right:0}
  body.loaded .drop{
    position:static;width:max-content;max-width:100%;
    margin:8px 0 0 auto
  }
}
#file{display:none}
#work{display:none;margin-top:16px}
.bar{
  display:flex;gap:10px;align-items:end;flex-wrap:wrap;padding:12px;border-bottom:1px solid var(--bd)
}
label.ctrl{
  font-size:12px;color:var(--muted);display:flex;flex-direction:column;gap:4px
}
select,button{
  font:inherit;color:var(--text);background:var(--panel);
  border:1px solid var(--bd);border-radius:8px;padding:8px 10px
}
button{cursor:pointer}
button.primary{background:var(--accent);color:#fff;border-color:transparent}
button.good{background:var(--ok);color:#fff;border-color:transparent}
button.cheat{background:#7b3fb0;color:#fff;border-color:transparent}
button:disabled{opacity:.45;cursor:not-allowed}
.status{margin-left:auto;color:var(--muted);font-size:13px}
.status.ok{color:var(--ok)}
.status.warn{color:var(--warn)}
.status.danger{color:var(--danger)}
.main{display:grid;grid-template-columns:minmax(0,1fr) 410px;gap:14px;padding:14px}
@media(max-width:1050px){.main{grid-template-columns:1fr}}
.canvasWrap{overflow:auto}
canvas{display:block;max-width:100%;height:auto;margin:auto;border-radius:8px;background:var(--panel);cursor:pointer;touch-action:none;user-select:none;-webkit-user-select:none}
.legend{font-size:12px;color:var(--muted);margin-top:8px;line-height:1.55}

.side{display:flex;flex-direction:column;gap:12px}
.card{border:1px solid var(--bd);border-radius:10px;padding:12px}
.card h2{font-size:16px;margin:0 0 10px}
.card h3{font-size:14px;margin:12px 0 8px}
.meta{display:grid;grid-template-columns:112px 1fr;gap:7px 10px;margin:0;font-size:13px}
.meta dt{color:var(--muted)}
.meta dd{margin:0}
.actions{display:flex;flex-wrap:wrap;gap:8px}
.message{
  margin-top:10px;padding:10px 11px;border-radius:8px;background:var(--soft);
  font-size:13px;line-height:1.6;white-space:pre-wrap
}
.message.ok{border-left:4px solid var(--ok)}
.message.warn{border-left:4px solid var(--warn)}
.message.danger{border-left:4px solid var(--danger)}
.message.hint{border-left:4px solid var(--hint)}
.stepTitle{font-weight:700;margin-bottom:5px}
.coords{font-family:ui-monospace,SFMono-Regular,Consolas,monospace}
.badges{display:flex;gap:6px;flex-wrap:wrap;margin-top:8px}
.badge{
  display:inline-flex;align-items:center;border:1px solid var(--bd);
  border-radius:999px;padding:3px 7px;font-size:11px
}
.badge.x{border-color:#e09595}
.badge.cat{border-color:#79b98c}
.badge.strategy{border-color:#aa96e0}

.colorRef{
  display:inline-flex;align-items:center;vertical-align:-2px;
  margin:0 .12em;padding:1px 5px 1px 3px;
  border:1px solid var(--bd);border-radius:6px;background:var(--panel)
}
.colorRef svg{width:18px;height:18px;display:block}
.colorRefs{display:inline-flex;gap:4px;align-items:center;vertical-align:-3px;margin:0 .15em}

.cellPosRef{
  display:inline-flex;align-items:center;gap:4px;vertical-align:-2px;
  margin:0 .08em;padding:1px 5px 1px 3px;
  border:1px solid var(--bd);border-radius:6px;background:var(--panel);
  white-space:nowrap;font-weight:650
}
.cellPosRef svg{width:16px;height:16px;display:block;flex:0 0 auto}
.cellPosRefs{display:inline-flex;flex-wrap:wrap;gap:4px;align-items:center;vertical-align:-2px}
.trace{
  margin-top:10px;padding:9px 10px;border:1px solid var(--bd);
  border-radius:8px;background:color-mix(in srgb,var(--soft) 72%,transparent);
  font-size:12px;line-height:1.55
}
.trace ol{margin:5px 0 0 20px;padding:0}
.trace li{margin:4px 0}
.complete{
  border-left:4px solid var(--ok)!important;
  background:color-mix(in srgb,var(--ok) 8%,var(--soft))!important
}
.stateList{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px}
.stateCard{border:1px solid var(--bd);border-radius:8px;padding:8px}
.stateCard b{display:block;font-size:14px}
.stateCard span{font-size:12px;color:var(--muted)}
.palette{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:7px}
.palItem{display:flex;align-items:center;gap:7px;border:1px solid var(--bd);border-radius:8px;padding:6px 7px;min-width:0}
.swatch{width:22px;height:22px;border-radius:5px;border:1px solid rgba(0,0,0,.15);flex:0 0 auto}
.palText{min-width:0}.palId{font-weight:700}.palCount{color:var(--muted);font-size:11px}
details{border-top:1px solid var(--bd);padding-top:10px;margin-top:10px}
summary{cursor:pointer;color:var(--muted);font-size:13px}
pre{
  font:12px/1.45 ui-monospace,SFMono-Regular,Consolas,monospace;white-space:pre-wrap;
  word-break:break-word;max-height:320px;overflow:auto;
  background:var(--soft);padding:10px;border-radius:8px
}
.note{font-size:12px;color:var(--muted);line-height:1.6}
.editHelp{font-size:12px;color:var(--muted);line-height:1.55}
.repairCells{display:flex;flex-wrap:wrap;gap:5px;margin-top:7px}

hr{border:0;border-top:1px solid var(--bd);margin:12px 0}

/* Product layout */
body{background:#f4f6f8}
.appShell{max-width:1460px;margin:0 auto;padding:18px 22px 30px}
.appHeader{
  display:flex;align-items:center;justify-content:space-between;gap:20px;
  margin-bottom:14px
}
.brand h1{font-size:25px;margin:0 0 3px;letter-spacing:-.02em}
.brand p{margin:0;color:var(--muted);font-size:13px;line-height:1.45}
.appHeader .drop{
  width:320px;min-height:66px;padding:10px 16px;border-radius:11px;
  display:flex;flex-direction:column;justify-content:center;flex:0 0 auto
}
.appHeader .drop b{font-size:14px;margin:0 0 2px}
.appHeader .drop span{font-size:11px}
body.loaded .appHeader .drop{
  position:static!important;top:auto!important;right:auto!important;
  width:250px;min-height:58px;padding:8px 13px;margin:0;
  box-shadow:none
}
body.loaded h1{padding-right:0!important}

#work{display:none}
.commandBar{
  display:flex;align-items:center;gap:12px;min-height:48px;
  padding:8px 10px;margin-bottom:12px;
  background:var(--panel);border:1px solid var(--bd);border-radius:11px
}
.commandMain{display:flex;align-items:center;gap:12px}
.toolbarBtn{font-weight:650}
.inputHint{font-size:12px;color:var(--muted);white-space:nowrap}
.commandBar .status{margin-left:auto}
.settingsBox{position:relative;margin-left:auto}
.settingsBox>summary{
  cursor:pointer;list-style:none;font-size:12px;color:var(--muted);
  border:1px solid var(--bd);border-radius:8px;padding:7px 10px
}
.settingsBox>summary::-webkit-details-marker{display:none}
.settingsBox[open] .settingsGrid{
  position:absolute;z-index:50;right:0;top:40px;width:420px;
  display:grid;grid-template-columns:repeat(3,1fr);gap:9px;
  padding:12px;background:var(--panel);border:1px solid var(--bd);
  border-radius:10px;box-shadow:0 12px 32px rgba(0,0,0,.14)
}
.settingsGrid button{align-self:end}

.workspace{
  display:grid;grid-template-columns:minmax(620px,1fr) minmax(420px,520px);
  gap:14px;align-items:start
}
.boardCard{
  background:var(--panel);border:1px solid var(--bd);border-radius:14px;
  padding:12px;min-width:0
}
.boardCard canvas{margin:0 auto}
.boardHelp{
  margin:8px 4px 0;color:var(--muted);font-size:12px;line-height:1.6
}
.boardHelp b{color:var(--text)}
.guideColumn{display:grid;gap:12px}
.card{background:var(--panel)}
.cardHead{
  display:flex;align-items:center;justify-content:space-between;gap:10px;
  margin-bottom:8px
}
.cardHead h2,.resetCard h2{margin:0;font-size:16px}
.actions.compact{gap:6px;flex-wrap:nowrap}
.message{margin-top:6px}
.strategyDetails{margin-top:9px;padding-top:8px}
.strategyDetails summary{font-size:12px}
.lowerGrid{
  display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:14px
}
.resetButtons{display:flex;gap:7px;flex-wrap:wrap;margin:9px 0}
.resetCard .note{margin-top:7px}
.diagnostics{margin-top:14px;padding:0}
.diagnostics>summary{
  padding:11px 13px;font-weight:650;color:var(--text);cursor:pointer
}
.diagnosticsGrid{
  display:grid;grid-template-columns:.9fr .8fr 1fr 1.5fr;
  gap:14px;padding:0 13px 13px;border-top:1px solid var(--bd)
}
.diagnosticsGrid>div{padding-top:12px;min-width:0}
.diagnosticsGrid h3{margin:0 0 8px;font-size:13px}
.jsonPane pre{max-height:190px;margin:0}
.repairCells .cellPosRef{background:#fff}

@media(max-width:1120px){
  .workspace{grid-template-columns:1fr}
  .guideColumn{grid-template-columns:1fr 1fr}
  .diagnosticsGrid{grid-template-columns:1fr 1fr}
}
@media(max-width:760px){
  .appShell{padding:12px}
  .appHeader{align-items:flex-start}
  .brand p{display:none}
  .appHeader .drop,body.loaded .appHeader .drop{width:210px}
  .commandBar{flex-wrap:wrap}
  .inputHint{white-space:normal}
  .settingsBox{margin-left:0}
  .commandBar .status{margin-left:auto}
  .settingsBox[open] .settingsGrid{position:fixed;left:12px;right:12px;top:110px;width:auto}
  .guideColumn,.lowerGrid,.diagnosticsGrid{grid-template-columns:1fr}
  .workspace{display:block}
  .guideColumn{margin-top:12px}
  .boardCard{padding:8px}
}