:root{--paper:#ECEBE7;--surface:#F4F3EF;--ink:#2D5353;--ink2:#1F3B3B;--muted:#4E6563;--rule:rgba(45,83,83,.18);--light:#DCE4E0;--dark:#2D5353;--ok:#2F8F62;--gold:#E9B44C;--chat:420px;--top:60px}
*{box-sizing:border-box}
html,body{margin:0;height:100%;background:var(--paper);color:var(--ink);font-family:Manrope,system-ui,sans-serif;font-weight:600;-webkit-font-smoothing:antialiased}
button{font:inherit;cursor:pointer;color:inherit}
button:focus-visible,a:focus-visible,.sq.pc:focus-visible,textarea:focus-visible{outline:3px solid var(--gold);outline-offset:2px}
.shell{height:100vh;height:100dvh;display:flex;flex-direction:column}
.top{height:var(--top);display:flex;align-items:center;gap:16px;padding:0 20px;border-bottom:1px solid var(--rule);flex:none;background:var(--paper);position:relative;z-index:5}
.brand img{height:24px;display:block}
.brand{font-weight:800;color:var(--ink);text-decoration:none}
.tag{font-family:'JetBrains Mono',monospace;font-weight:700;font-size:12px;letter-spacing:.08em;text-transform:uppercase;padding:5px 9px;background:var(--ink);color:var(--paper)}
.topr{margin-left:auto;display:flex;align-items:center;gap:12px}
.prog{display:flex;align-items:center;gap:8px;font-family:'JetBrains Mono',monospace;font-size:13px;font-weight:700}
.pbar{width:96px;height:8px;background:var(--light);border:1.5px solid var(--ink);display:block;overflow:hidden}
.pbar i{display:block;height:100%;width:0;background:var(--ok);transition:width .6s cubic-bezier(.3,.7,.2,1)}
.ghost{background:transparent;border:1.5px solid var(--ink);color:var(--ink);padding:8px 14px;font-weight:700;font-size:14px}
.ghost:hover{background:var(--ink);color:var(--paper)}
.solid{background:var(--ink);color:var(--paper);border:0;padding:12px 18px;font-weight:700;font-size:15px;display:inline-flex;align-items:center;justify-content:center;gap:10px;transition:background .15s ease,transform .1s ease}
.solid:hover:not(:disabled){background:var(--ink2)}
.solid:active:not(:disabled){transform:translateY(1px)}
.solid:disabled{opacity:.4;cursor:default}
.me{position:relative}
.mebtn{background:none;border:0;padding:0;display:block}
.av{width:34px;height:34px;border-radius:50%;background:var(--ink) center/cover no-repeat;color:var(--paper);display:flex;align-items:center;justify-content:center;font-weight:800;font-size:14px;border:2px solid var(--ink)}
.menu{position:absolute;right:0;top:44px;background:var(--surface);border:1.5px solid var(--ink);min-width:220px;padding:6px;box-shadow:0 10px 30px rgba(31,59,59,.15)}
.menu[hidden]{display:none}
.menu .mail{margin:0;padding:8px 10px 10px;font-size:13px;font-weight:700;color:var(--muted);border-bottom:1px solid var(--rule);word-break:break-all}
.menu button{display:block;width:100%;text-align:left;background:none;border:0;padding:10px;font-weight:700;font-size:14px}
.menu button:hover{background:var(--light)}
.main{flex:1;display:grid;grid-template-columns:1fr var(--chat);min-height:0}

/* board */
.boardwrap{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:20px;min-width:0;min-height:0;overflow:hidden}
.board{--s:min(calc(100vw - var(--chat) - 56px),calc(100vh - var(--top) - 80px));width:var(--s);height:var(--s);display:grid;grid-template-columns:repeat(8,minmax(0,1fr));grid-template-rows:repeat(8,minmax(0,1fr));position:relative;border:2px solid var(--ink);background:var(--surface);user-select:none;box-sizing:content-box}
.sq{position:relative;display:flex;align-items:center;justify-content:center;will-change:transform,opacity;min-width:0;min-height:0;overflow:hidden}
.sq.l{background:var(--light)}.sq.d{background:var(--dark)}
.sq .g{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;font-family:'JetBrains Mono',monospace;font-weight:700;font-size:calc(var(--s)/36);line-height:1.02;letter-spacing:.04em;white-space:pre;text-align:center;color:var(--ink);pointer-events:none}
.sq.d .g{color:var(--light)}
.sq.fxon{background:transparent!important}
.sq.gone{opacity:0;visibility:hidden}
.sq.pc{cursor:pointer;z-index:1}
.sq.pc img{height:58%;max-height:58%;width:auto;max-width:80%;object-fit:contain;margin-bottom:8%;transition:transform .2s ease;filter:drop-shadow(0 2px 2px rgba(0,0,0,.18));pointer-events:none}
.sq.l.pc img{filter:brightness(.5) saturate(1.3) drop-shadow(0 2px 2px rgba(0,0,0,.12))}
.sq.pc:hover img{transform:translateY(-4px)}
.sq.pc .lb{position:absolute;left:3px;right:3px;bottom:3px;font-size:clamp(8px,calc(var(--s)/68),12px);font-weight:800;text-align:center;letter-spacing:.01em;line-height:1.1;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.sq.l .lb{color:var(--ink2)}.sq.d .lb{color:var(--paper)}
.sq.pc.sel{box-shadow:inset 0 0 0 3px var(--gold)}
.sq.pc.next:not(.sel)::after{content:"";position:absolute;inset:3px;border:2px dashed var(--gold);animation:pulse 1.6s ease-in-out infinite;pointer-events:none}
@keyframes pulse{0%,100%{opacity:.35}50%{opacity:1}}
.sq .tick{position:absolute;top:3px;right:3px;width:clamp(18px,calc(var(--s)/22),30px);height:clamp(18px,calc(var(--s)/22),30px);border-radius:50%;background:var(--ok);color:#fff;font-size:clamp(11px,calc(var(--s)/38),17px);font-weight:800;display:none;align-items:center;justify-content:center;border:2px solid var(--surface);box-shadow:0 1px 3px rgba(0,0,0,.25)}
.sq.done .tick{display:flex}
.sq.done.pc{box-shadow:inset 0 -4px 0 var(--ok)}
.sq.done.pc.sel{box-shadow:inset 0 0 0 3px var(--gold),inset 0 -7px 0 var(--ok)}
.sq.done.l{background:#D3E5D9}
.sq.done.d{background:#285A4A}
.sq.pop .tick{animation:pop .5s cubic-bezier(.3,1.6,.5,1)}
@keyframes pop{0%{transform:scale(0)}100%{transform:scale(1)}}
.sq .num{position:absolute;top:3px;left:4px;font-family:'JetBrains Mono',monospace;font-size:clamp(8px,calc(var(--s)/80),11px);font-weight:700;opacity:.75}
.sq.l .num{color:var(--ink)}.sq.d .num{color:var(--paper)}

/* field */
.field{position:absolute;left:0;right:0;top:12.5%;height:75%;background:var(--surface);padding:clamp(14px,calc(var(--s)/28),30px);display:flex;flex-direction:column;opacity:0;transition:opacity .3s ease;z-index:2}
.field.on{opacity:1}
.field[hidden]{display:none}
.fhead{display:flex;gap:14px;align-items:flex-start;padding-bottom:12px;border-bottom:1.5px solid var(--rule)}
.fhtext{min-width:0;flex:1}
.fpiece{height:clamp(40px,calc(var(--s)/10),72px);filter:brightness(.5) saturate(1.3)}
.eyebrow{margin:0 0 4px;font-family:'JetBrains Mono',monospace;font-weight:700;font-size:12px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted)}
.fhead h2{margin:0;font-size:clamp(20px,calc(var(--s)/22),34px);font-weight:800;letter-spacing:-.035em;line-height:1.05;min-height:1.05em}
.fabout{margin:6px 0 0;color:var(--muted);font-size:clamp(13px,calc(var(--s)/44),15px);font-weight:600}
.x{background:none;border:0;font-size:30px;line-height:1;color:var(--ink);padding:0 4px;font-weight:700}
.x:hover{color:var(--ink2)}
.flist{margin:0;flex:1;overflow:auto;padding:4px 0;min-height:0}
.flist .row{padding:10px 0;border-bottom:1px solid var(--rule)}
.flist label{display:block;font-size:11.5px;font-weight:800;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);margin:0 0 4px}
.flist textarea{display:block;width:100%;resize:none;border:1.5px solid transparent;background:transparent;font:inherit;font-size:clamp(14px,calc(var(--s)/42),16px);font-weight:600;line-height:1.45;color:var(--ink2);padding:4px 6px;margin:0 -6px;width:calc(100% + 12px);overflow:hidden;outline:none;transition:border-color .15s ease,background .15s ease}
.flist textarea::placeholder{color:rgba(45,83,83,.42);font-weight:600}
.flist textarea:hover{border-color:var(--rule)}
.flist textarea:focus{border-color:var(--ink);background:var(--paper)}
.flist textarea.flash{animation:fl 1.4s ease}
@keyframes fl{0%{background:#DDEBD9}100%{background:transparent}}
.fact{display:flex;align-items:center;gap:12px;padding-top:12px;flex-wrap:wrap}
.fstate{font-size:14px;font-weight:700;color:var(--muted)}
.fstate.ok{color:var(--ok)}
.fact .solid{margin-left:auto}
.fact .solid.done{background:var(--ok);opacity:1}
.hint{margin:12px 0 0;font-size:14px;font-weight:700;color:var(--muted);min-height:1.4em;text-align:center}
.hint b{color:var(--ink);font-weight:800}
.hint button{background:none;border:0;padding:0;font-weight:800;color:var(--ink);text-decoration:underline;text-underline-offset:3px}

/* chat */
.chat{border-left:1px solid var(--rule);display:flex;flex-direction:column;min-height:0;background:var(--surface)}
.chead{padding:14px 20px;border-bottom:1px solid var(--rule);position:relative}
.chead h3{margin:0;font-size:20px;font-weight:800;letter-spacing:-.03em}
.save{position:absolute;right:20px;top:16px;font-family:'JetBrains Mono',monospace;font-size:11px;font-weight:700;color:var(--muted);letter-spacing:.04em}
.save.err{color:#B4462F}
.msgs{flex:1;overflow:auto;padding:18px 20px;display:flex;flex-direction:column;gap:10px;min-height:0}
.m{max-width:88%;padding:10px 14px;font-size:15px;line-height:1.5;font-weight:600;white-space:pre-wrap;word-wrap:break-word;animation:min .25s ease}
@keyframes min{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
.m.a{background:var(--paper);color:var(--ink2);align-self:flex-start;border:1px solid var(--rule)}
.m.u{background:var(--ink);color:var(--paper);align-self:flex-end}
.m.sys{align-self:center;background:none;color:var(--muted);font-size:13px;text-align:center;max-width:94%;padding:4px 8px}
.m.err{align-self:stretch;max-width:none;background:#F6E7E2;color:#8A3523;border:1px solid #E5C1B6;font-size:14px;display:flex;align-items:center;gap:10px}
.m.err button{margin-left:auto;background:none;border:1.5px solid currentColor;padding:4px 10px;font-weight:700;font-size:13px;flex:none}
.m .cf{display:flex;margin-top:10px;width:100%}
.typing{align-self:flex-start;background:var(--paper);border:1px solid var(--rule);padding:12px 14px;display:flex;gap:5px;align-items:center}
.typing i{width:7px;height:7px;border-radius:50%;background:var(--ink);opacity:.3;animation:dot 1.1s infinite ease-in-out}
.typing i:nth-child(2){animation-delay:.15s}.typing i:nth-child(3){animation-delay:.3s}
@keyframes dot{0%,80%,100%{opacity:.25;transform:translateY(0)}40%{opacity:1;transform:translateY(-3px)}}
.composer{display:flex;gap:8px;padding:12px 14px 6px;border-top:1px solid var(--rule)}
.composer textarea{flex:1;resize:none;font:inherit;font-weight:600;font-size:15px;color:var(--ink2);background:var(--paper);border:1.5px solid var(--rule);padding:11px 12px;max-height:160px;outline:none;line-height:1.4}
.composer textarea:focus{border-color:var(--ink)}
.composer textarea:disabled{opacity:.6}
.composer .solid{width:48px;padding:0;font-size:20px;flex:none}
.kbd{margin:0;padding:0 14px 10px;font-size:11.5px;font-weight:700;color:var(--muted);font-family:'JetBrains Mono',monospace}

/* welcome gate */
.gate{position:fixed;inset:0;background:var(--paper);display:flex;align-items:center;justify-content:center;z-index:30;padding:20px;overflow:auto}
.gate::before{content:"";position:absolute;inset:0;background:repeating-conic-gradient(var(--light) 0 25%,transparent 0 50%) 0 0/72px 72px;opacity:.55;-webkit-mask:radial-gradient(ellipse at center,transparent 30%,#000 85%);mask:radial-gradient(ellipse at center,transparent 30%,#000 85%)}
.gate[hidden]{display:none}
.gbox{position:relative;max-width:460px;width:100%;text-align:center;background:var(--surface);border:2px solid var(--ink);padding:32px 30px 26px;box-shadow:8px 8px 0 var(--ink)}
.glogo{height:24px;display:block;margin:0 auto 18px}
.gart{display:flex;justify-content:center;align-items:flex-end;gap:4px;height:72px;margin-bottom:16px}
.gart img{height:56px;filter:brightness(.5) saturate(1.3)}
.gart img:nth-child(3){height:72px}
.gart img:nth-child(2),.gart img:nth-child(4){height:62px}
.gbox h1{font-size:clamp(25px,6vw,31px);font-weight:800;letter-spacing:-.04em;line-height:1.08;margin:6px 0 10px;color:var(--ink2)}
.gpromise{color:var(--muted);font-size:16px;line-height:1.5;margin:0 0 22px}
.wide{width:100%;padding:15px 18px;font-size:16px}
.gerr{font-size:14px;font-weight:700;color:#B4462F;margin:12px 0 0;min-height:0}
.gerr:empty{display:none}
.gdemo{display:inline-block;margin-top:14px;font-weight:700;font-size:14px;color:var(--ink);text-underline-offset:3px}
.gpts{list-style:none;padding:16px 0 0;margin:18px 0 0;border-top:1px solid var(--rule);display:grid;grid-template-columns:repeat(3,1fr);gap:10px;text-align:left}
.gpts li{font-size:12.5px;line-height:1.35;color:var(--muted);font-weight:700}
.gpts b{display:block;font-family:'JetBrains Mono',monospace;font-size:16px;color:var(--ink);margin-bottom:2px}

/* intro overlay */
.intro{position:fixed;inset:0;background:rgba(31,59,59,.55);display:flex;align-items:center;justify-content:center;z-index:25;padding:20px;animation:fade .25s ease}
.intro[hidden]{display:none}
@keyframes fade{from{opacity:0}to{opacity:1}}
.ibox{max-width:420px;width:100%;background:var(--surface);border:2px solid var(--ink);padding:26px;box-shadow:8px 8px 0 var(--ink2)}
.ivis{height:110px;display:flex;align-items:center;justify-content:center;margin-bottom:16px;background:var(--light);border:1.5px solid var(--rule);font-family:'JetBrains Mono',monospace;font-weight:700;font-size:13px;color:var(--ink);gap:6px;overflow:hidden}
.ivis img{height:60px;filter:brightness(.5) saturate(1.3)}
.ivis .mini{display:grid;grid-template-columns:repeat(8,14px);grid-template-rows:repeat(4,14px);border:1.5px solid var(--ink)}
.ivis .mini i{display:block}.ivis .mini i:nth-child(odd){background:var(--paper)}.ivis .mini i:nth-child(even){background:var(--ink)}
.ivis .mini i.r:nth-child(odd){background:var(--ink)}.ivis .mini i.r:nth-child(even){background:var(--paper)}
.ivis .bub{background:var(--paper);border:1px solid var(--rule);padding:8px 10px;font-family:Manrope,sans-serif;font-size:13px;max-width:200px;text-align:left}
.ivis .tk{width:30px;height:30px;border-radius:50%;background:var(--ok);color:#fff;display:flex;align-items:center;justify-content:center;font-size:16px}
.ibox h2{margin:0 0 8px;font-size:23px;font-weight:800;letter-spacing:-.035em;color:var(--ink2)}
.ibox p:not(.eyebrow){margin:0;color:var(--muted);font-size:15px;line-height:1.5}
.idots{display:flex;gap:6px;margin:18px 0 0}
.idots i{width:22px;height:4px;background:var(--rule);transition:background .2s}
.idots i.on{background:var(--ink)}
.iact{display:flex;justify-content:space-between;margin-top:18px}

.boot{position:fixed;inset:0;display:none;align-items:center;justify-content:center;background:var(--paper);z-index:40;font-family:'JetBrains Mono',monospace;font-weight:700;color:var(--muted)}
.booting .boot{display:flex}

@media (max-width:900px){
  :root{--chat:100vw;--top:54px}
  .shell{height:auto;min-height:100vh}
  .top{padding:0 12px;gap:10px;position:sticky;top:0}
  .tag{display:none}
  .pbar{width:56px}
  .ghost{padding:7px 10px;font-size:13px}
  .main{grid-template-columns:1fr}
  .board{--s:min(calc(100vw - 20px),560px)}
  .boardwrap{padding:10px 10px 4px}
  .chat{border-left:0;border-top:1px solid var(--rule);height:72vh;height:72dvh;min-height:420px}
  .field{padding:10px 12px}
  .fpiece{display:none}
  .fhead{padding-bottom:8px}
  .fhead h2{font-size:20px}
  .fact{padding-top:8px}
  .flist .row{padding:7px 0}
  .fact .solid{padding:10px 14px;font-size:14px}
  .gpts{grid-template-columns:1fr;text-align:center}
  .gbox{padding:26px 20px 22px;box-shadow:5px 5px 0 var(--ink)}
}
@media (max-width:420px){ .brand img{height:20px} .fpiece{display:none} }
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}
}