:root{--bg:#f5f7fb;--card:#fff;--text:#172033;--muted:#667085;--line:#dfe5ee;--blue:#2563eb;--red:#b42318}
*{box-sizing:border-box}body{margin:0;font:14px/1.45 system-ui,-apple-system,Segoe UI,Arial;background:var(--bg);color:var(--text)}
button,input,select{font:inherit}button{cursor:pointer}.top{height:64px;background:#fff;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 18px;position:sticky;top:0;z-index:30}
.logo{font-size:22px;font-weight:850}.badge{font-size:12px;background:#eaf8ef;color:#18794e;padding:6px 10px;border-radius:999px}
.app{display:grid;grid-template-columns:290px minmax(560px,1fr) 280px;gap:14px;max-width:1500px;margin:14px auto;padding:0 14px}
.panel{background:#fff;border:1px solid var(--line);border-radius:16px;padding:16px;box-shadow:0 6px 22px #2330440b}.left .panel,.right .panel{margin-bottom:12px}
h2{font-size:16px;margin:0 0 12px}label{display:block;color:var(--muted);font-size:12px;margin:10px 0 5px}
input[type=file],input[type=text],input[type=number],select{width:100%;border:1px solid #d8dee8;border-radius:9px;padding:9px;background:#fff}
.btn{border:0;border-radius:10px;padding:10px 13px;background:var(--blue);color:#fff;font-weight:750}.btn.secondary{background:#eef2f7;color:var(--text)}.btn.danger{background:#fff0f0;color:var(--red)}
.small{font-size:12px;color:var(--muted)}.row{display:flex;gap:8px}.row>*{flex:1}.status{margin-top:10px;padding:9px;border-radius:9px;background:#f1f5f9}
.toolbar{display:flex;gap:7px;align-items:center;flex-wrap:wrap;margin-bottom:12px}.toolbar select{width:auto;min-width:260px}.toolbar .spacer{flex:1}
.viewer{overflow:auto;min-height:720px;background:#eef2f7;border-radius:12px;padding:18px}.page{position:relative;margin:0 auto 20px;background:#fff;box-shadow:0 3px 18px #0002}.page canvas{display:block}.overlay{position:absolute;inset:0}.overlay.drop{outline:3px solid #2563eb66;outline-offset:-3px}
.mark{position:absolute;cursor:move;transform-origin:center;border:1px dashed transparent;background:transparent}.mark.sel{border-color:var(--blue)}.mark img{width:100%;height:100%;object-fit:contain;pointer-events:none}.mark.stamp{display:flex;align-items:center;justify-content:center;border:2px solid currentColor;font-weight:800;background:transparent!important;box-shadow:none!important}
.resize{display:none;position:absolute;right:-8px;bottom:-8px;width:16px;height:16px;background:#fff;border:2px solid var(--blue);border-radius:3px;cursor:nwse-resize}.rotate{display:none;position:absolute;left:50%;top:-28px;transform:translateX(-50%);width:17px;height:17px;border-radius:50%;background:#fff;border:2px solid var(--blue);cursor:grab}.mark.sel .resize,.mark.sel .rotate{display:block}.mark.sel:before{content:"";position:absolute;left:50%;top:-12px;height:12px;border-left:1px solid var(--blue)}
.cropWrap{display:none;margin-top:10px}.cropStage{position:relative;height:250px;border:1px solid var(--line);border-radius:12px;background:#fafafa;display:flex;align-items:center;justify-content:center;overflow:hidden}.cropStage canvas{max-width:100%;max-height:100%;display:block}
.cropBox{position:absolute;border:2px solid var(--blue);box-shadow:0 0 0 9999px #0006;cursor:move}.cropHandle{position:absolute;width:16px;height:16px;background:#fff;border:2px solid var(--blue);border-radius:50%}.nw{left:-9px;top:-9px;cursor:nwse-resize}.ne{right:-9px;top:-9px;cursor:nesw-resize}.sw{left:-9px;bottom:-9px;cursor:nesw-resize}.se{right:-9px;bottom:-9px;cursor:nwse-resize}
.assetGrid{display:grid;grid-template-columns:1fr 1fr;gap:9px}.asset{position:relative;border:1px solid var(--line);border-radius:11px;padding:7px;background:#fff;cursor:grab;user-select:none}.asset:active{cursor:grabbing}.asset img{width:100%;height:82px;object-fit:contain;background:#fafafa;border-radius:7px}.asset .name{font-size:11px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;margin-top:5px}.asset .x{position:absolute;right:4px;top:4px;width:24px;height:24px;border:0;border-radius:50%;background:#fff;color:var(--red);box-shadow:0 1px 5px #0003}
.stamps{display:grid;grid-template-columns:1fr 1fr;gap:8px}.stampBtn{background:#fff;border:2px solid currentColor;border-radius:8px;padding:9px 5px;font-size:11px;font-weight:800}.colorRow{display:flex;align-items:center;gap:8px}.colorRow input{width:46px;height:38px;padding:2px;border:1px solid var(--line);border-radius:8px}
.help{background:#f8fafc;border:1px solid var(--line);border-radius:10px;padding:9px;margin-top:8px}
@media(max-width:1150px){.app{grid-template-columns:270px 1fr}.right{grid-column:1/-1;display:grid;grid-template-columns:1fr 1fr;gap:12px}.right .panel{margin:0}}
@media(max-width:780px){.app{grid-template-columns:1fr}.right{display:block}.right .panel{margin-bottom:12px}.viewer{min-height:500px}.toolbar select{min-width:180px}}

/* v15: placed stamps must never cover document content */
.overlay .mark.stamp,
.overlay .mark.stamp.sel {
  background: transparent !important;
  background-color: transparent !important;
  box-shadow: none !important;
}


/* v20: document scrolls independently from side panels */
.downloadRight{
  border-top:1px solid var(--line);
  margin-top:16px;
  padding-top:16px;
}
.downloadRight h2{margin-bottom:8px}

@media (min-width:1151px){
  html,body{
    height:100%;
    overflow:hidden;
  }
  .app{
    height:calc(100vh - 92px);
    min-height:0;
    align-items:stretch;
  }
  .left,.right,main{
    min-height:0;
  }
  .left,.right{
    height:100%;
    overflow-y:auto;
    overscroll-behavior:contain;
    padding-right:2px;
  }
  main{
    height:100%;
  }
  main>.panel{
    height:100%;
    min-height:0;
    display:flex;
    flex-direction:column;
  }
  main>.panel>.toolbar,
  main>.panel>.help{
    flex:0 0 auto;
  }
  .viewer{
    flex:1 1 auto;
    min-height:0;
    height:auto;
    overflow-x:auto;
    overflow-y:auto;
    overscroll-behavior:contain;
    scrollbar-gutter:stable;
  }
}


/* v22: automatically fit every document page to the center panel width */
.viewer{
  overflow-x:hidden !important;
}
#stage{
  width:100%;
}
#stage .page{
  margin-left:auto;
  margin-right:auto;
  max-width:100%;
}