:root{
  --paper:#F2EDE4;
  --ink:#211f1b;
  --ink-2:#6b6459;
  --line:#d8d0c2;
  --accent:#1a49c8;
  --warn:#b3341f;
  --ok:#1d6b3c;
  --side:342px;
}
*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  background:#e6e0d4;
  color:var(--ink);
  font:13px/1.5 "Helvetica Neue",Helvetica,"PingFang SC","Hiragino Sans GB","Microsoft Yahei",sans-serif;
  -webkit-font-smoothing:antialiased;
}
.mono{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:11px;letter-spacing:.01em}
#app{display:grid;grid-template-columns:var(--side) 1fr;height:100vh;overflow:hidden}

/* ---------- sidebar ---------- */
#side{
  background:var(--paper);
  border-right:1px solid var(--line);
  overflow-y:auto;
  padding:20px 18px 40px;
}
.brand h1{margin:0;font-size:16px;letter-spacing:.04em;font-weight:600}
.brand .ver{margin:4px 0 0;font-size:11px;color:var(--ink-2);letter-spacing:.02em}
.grp{margin-top:20px;padding-top:15px;border-top:1px solid var(--line)}
.lab{display:block;font-size:10px;letter-spacing:.16em;text-transform:uppercase;color:var(--ink-2);margin-bottom:9px}
.note{margin-top:7px;font-size:11px;color:var(--ink-2);line-height:1.55}
.note.mono{font-family:ui-monospace,Menlo,Consolas,monospace;font-size:10.5px}
.meta{margin-top:8px;font-size:11px;color:var(--ink-2);font-family:ui-monospace,Menlo,monospace;word-break:break-all}

.drop{
  border:1px dashed #bdb3a1;border-radius:3px;background:#faf7f0;
  padding:16px 12px;text-align:center;cursor:pointer;display:block;outline:none;
  transition:background .15s,border-color .15s;
}
.drop:hover,.drop.hot,.drop:focus{background:#fff;border-color:var(--accent)}
.dz-title{display:block;font-size:12px}
.dz-sub{display:block;font-size:10.5px;color:var(--ink-2);margin-top:3px}

.seg{display:flex;border:1px solid var(--line);border-radius:3px;overflow:hidden;background:#faf7f0}
.seg button{
  flex:1;appearance:none;border:0;background:transparent;padding:6px 4px;
  font:inherit;font-size:11px;color:var(--ink-2);cursor:pointer;border-right:1px solid var(--line);
}
.seg button:last-child{border-right:0}
.seg button.on{background:var(--ink);color:#f7f3ea}
.seg.small{margin-top:9px}
.seg.small button{font-size:10.5px;padding:5px 2px}

.patterns{display:flex;flex-direction:column;gap:1px;background:var(--line);border:1px solid var(--line);border-radius:3px}
.pat{
  display:flex;align-items:center;gap:9px;background:#faf7f0;border:0;padding:7px 8px;
  cursor:pointer;text-align:left;font:inherit;width:100%;color:var(--ink);
}
.pat:hover{background:#fff}
.pat.on{background:var(--ink);color:#f7f3ea}
.pat.on .pn{color:#f7f3ea}
.pat.on .pc{color:#c9c0ac}
.pat .glyph{width:34px;height:22px;flex:0 0 34px}
.pat .pt{display:flex;flex-direction:column;line-height:1.35}
.pn{font-size:12px}
.pc{font-size:10px;color:var(--ink-2)}

.chk{display:flex;align-items:flex-start;gap:7px;margin-top:9px;font-size:11.5px;color:var(--ink-2);cursor:pointer;line-height:1.45}
.chk input{margin:2px 0 0;flex:0 0 auto}
.rng{display:flex;align-items:center;gap:8px;margin-top:10px;font-size:11.5px;color:var(--ink-2)}
.rng input{flex:1}

.palette{display:grid;grid-template-columns:repeat(4,1fr);gap:6px}
.pl-empty{grid-column:1/-1;font-size:11px;color:var(--ink-2)}
.sw{position:relative;border:1px solid var(--line);border-radius:2px;background:#fff;padding:0;cursor:pointer}
.sw .chip{display:block;height:42px;width:100%}
.sw .tag{display:block;font-size:9.5px;letter-spacing:.02em;color:var(--ink-2);padding:3px 1px;text-align:center;background:#faf7f0}
.sw.on{border-color:var(--ink);box-shadow:0 0 0 1px var(--ink)}
.sw .tip{
  position:absolute;top:100%;left:0;margin-top:5px;width:158px;
  background:var(--ink);color:#f7f3ea;padding:5px 7px;border-radius:2px;
  font-family:ui-monospace,Menlo,monospace;font-size:10px;line-height:1.5;text-align:left;
  white-space:normal;opacity:0;pointer-events:none;transition:opacity .12s;z-index:8;
}
.palette .sw:nth-child(n+3) .tip{left:auto;right:0}
.sw:hover .tip{opacity:1}
.row{display:flex;align-items:center;gap:8px;margin-top:10px}
input[type=color]{width:38px;height:24px;padding:0;border:1px solid var(--line);background:none;cursor:pointer}

.warn{margin-top:10px;padding:7px 8px;border:1px solid var(--warn);border-radius:2px;color:var(--warn);font-size:11px;line-height:1.5;background:#fdf1ee}
.warn .mono{color:var(--warn)}
.hide{display:none}

.btns{display:flex;gap:8px}
.btn{
  flex:1;appearance:none;border:1px solid var(--ink);background:transparent;color:var(--ink);
  padding:8px 6px;font:inherit;font-size:11.5px;border-radius:3px;cursor:pointer;letter-spacing:.04em;
}
.btn:hover{background:#e9e2d5}
.btn.primary{background:var(--ink);color:#f7f3ea}
.btn.primary:hover{background:#000}
.btn[disabled]{opacity:.35;cursor:not-allowed}
.report{
  margin:12px 0 0;padding:9px 10px;background:#faf7f0;border:1px solid var(--line);border-radius:3px;
  font-family:ui-monospace,Menlo,Consolas,monospace;font-size:10.5px;line-height:1.7;
  white-space:pre-wrap;color:var(--ink-2);max-height:240px;overflow:auto;
}
.report b{color:var(--ink);font-weight:600}
.ok{color:var(--ok)}
.bad{color:var(--warn)}

/* ---------- stage ---------- */
#stage{position:relative;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:20px;overflow:hidden}
#stage.hot{background:#dcd5c6}
#stageInner{position:relative;display:flex;align-items:center;justify-content:center;flex:1;min-height:0;width:100%}
#preview{
  display:block;max-width:100%;max-height:100%;
  box-shadow:0 10px 40px rgba(0,0,0,.22);cursor:grab;outline:none;
}
#preview:focus{box-shadow:0 10px 40px rgba(0,0,0,.22),0 0 0 2px rgba(26,73,200,.5)}
#preview.grabbing{cursor:grabbing}
#preview.empty{display:none}
#placeholder{text-align:center;color:#a89d89}
#placeholder p{margin:14px 0 0;font-size:12px;letter-spacing:.08em}
.ph-stamp{
  width:132px;height:105px;margin:0 auto;border:1px dashed #b7ac97;border-radius:2px;
  background:repeating-linear-gradient(90deg,transparent 0 6px,rgba(183,172,151,.3) 6px 7px);
}
.stage-hint{margin-top:14px;font-size:10.5px;letter-spacing:.06em;color:#8d8474;text-align:center}
@media (max-width:900px){
  #app{grid-template-columns:1fr;grid-template-rows:auto 1fr;overflow:auto;height:auto}
  #side{border-right:0;border-bottom:1px solid var(--line)}
  #stage{min-height:70vh}
}