:root{
  --ink:#0f1720; --ink2:#334155; --muted:#64748b; --line:#e2e8f0; --line2:#cbd5e1;
  --bg:#eef1f4; --panel:#ffffff; --soft:#f6f8fa;
  --accent:#0d9488; --accent2:#0f766e; --accentSoft:#ccfbf1; --danger:#dc2626;
  --r:10px;
}
*{box-sizing:border-box}
html,body{margin:0;height:100%}
body{font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,sans-serif;color:var(--ink);background:var(--bg);
  display:grid;grid-template-rows:56px auto 1fr;height:100dvh;overflow:hidden;-webkit-tap-highlight-color:transparent}
button{font:inherit;color:inherit;cursor:pointer;border:0;background:none}
svg{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round;flex:none}

/* header */
.top{display:flex;align-items:center;gap:14px;padding:0 14px;background:var(--ink);color:#e2e8f0}
.brand{display:flex;align-items:center;gap:6px;font-weight:700;font-size:19px;letter-spacing:-.02em}
.brand .logo{background:var(--accent);color:#fff;border-radius:7px;padding:2px 7px;font-size:16px}
.brand .word{color:#fff}
.seg{display:flex;background:#1e293b;border-radius:9px;padding:3px}
.seg button{padding:6px 13px;border-radius:7px;font-weight:600;font-size:13px;letter-spacing:.04em;color:#94a3b8}
.seg button.on{background:#fff;color:var(--ink)}
.grow{flex:1}
.actions{display:flex;align-items:center;gap:6px}
.actions button{display:flex;align-items:center;gap:6px;height:36px;padding:0 12px;border-radius:9px;font-size:13px;font-weight:600}
.actions .icon{padding:0 9px;color:#cbd5e1}
.actions .icon:hover,.actions .ghost:hover{background:#1e293b}
.actions .ghost{color:#e2e8f0}
.actions .primary{background:var(--accent);color:#fff}
.actions .primary:hover{background:var(--accent2)}
.actions button:disabled{opacity:.35;cursor:default}

/* tools */
.tools{display:flex;align-items:stretch;gap:2px;padding:6px 10px;background:var(--panel);border-bottom:1px solid var(--line);overflow-x:auto;scrollbar-width:none}
.tools::-webkit-scrollbar{display:none}
.tools button{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;min-width:66px;padding:6px 8px;border-radius:9px;font-size:12px;color:var(--ink2)}
.tools button:hover{background:var(--soft)}
.tools button.danger{color:var(--danger)}
.tools button:disabled{opacity:.35;cursor:default;background:none}
.tools .sep{width:1px;background:var(--line);margin:6px 6px}

/* stage */
.stage{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.15fr) 330px;min-height:0}
.stage.v3d{grid-template-columns:minmax(0,1fr) 0 330px}
.stage.v2d{grid-template-columns:0 minmax(0,1fr) 330px}
.stage.v3d .p2d,.stage.v2d .p3d{display:none}
.pane{position:relative;min-width:0;min-height:0;overflow:hidden}
.p3d{background:radial-gradient(ellipse at 50% 38%,#ffffff 0%,#e7ebef 70%,#dde2e8 100%);border-right:1px solid var(--line)}
#view3d{position:absolute;inset:0}
#view3d canvas{display:block;width:100%!important;height:100%!important;touch-action:none}
.p2d{background:#e4e8ec}
#c2d{position:absolute;inset:0;width:100%;height:100%;touch-action:none;cursor:default}
.chips{position:absolute;left:50%;transform:translateX(-50%);bottom:14px;display:flex;gap:4px;align-items:center;background:#fff;border-radius:11px;padding:5px;box-shadow:0 4px 18px rgba(15,23,32,.12);max-width:calc(100% - 24px);overflow-x:auto;scrollbar-width:none}
.chips::-webkit-scrollbar{display:none}
.chips button{padding:6px 11px;border-radius:7px;font-size:13px;font-weight:600;color:var(--ink2);white-space:nowrap}
.chips button:hover{background:var(--soft)}
.chips button.on{background:var(--ink);color:#fff}
.chips b{font-size:12px;color:var(--muted);padding:0 6px;font-weight:600}
.zoom{position:absolute;right:12px;top:12px;display:flex;flex-direction:column;background:#fff;border-radius:10px;box-shadow:0 4px 18px rgba(15,23,32,.12);overflow:hidden}
.zoom button{width:38px;height:36px;font-size:18px;font-weight:600;color:var(--ink2)}
.zoom button:hover{background:var(--soft)}
.hint{position:absolute;left:12px;top:12px;font-size:12px;color:var(--muted);background:rgba(255,255,255,.75);padding:5px 9px;border-radius:7px;pointer-events:none}

/* panel */
.panel{background:var(--panel);border-left:1px solid var(--line);display:flex;flex-direction:column;min-height:0}
.tabs{display:flex;gap:4px;padding:10px 12px 0;border-bottom:1px solid var(--line)}
.tabs button{padding:9px 12px;font-size:13px;font-weight:600;color:var(--muted);border-bottom:2px solid transparent;margin-bottom:-1px}
.tabs button.on{color:var(--ink);border-color:var(--accent)}
.tab{display:none;padding:6px 16px 28px;overflow-y:auto;flex:1}
.tab.on{display:block}
.tab h4{display:flex;align-items:center;gap:8px;margin:18px 0 9px;font-size:11px;letter-spacing:.09em;text-transform:uppercase;color:var(--ink2)}
.sect{border-top:1px solid var(--line);margin-top:16px}
.note{font-size:12.5px;color:var(--muted);margin:-2px 0 10px;line-height:1.45}
.grid{display:grid;gap:8px}
.presets{grid-template-columns:repeat(3,1fr)}
.pats{grid-template-columns:repeat(4,1fr)}
.tile{display:flex;flex-direction:column;align-items:stretch;gap:4px;padding:4px;border-radius:9px;border:1.5px solid var(--line);background:#fff;font-size:11px;color:var(--ink2);font-weight:500}
.tile canvas{width:100%;aspect-ratio:1;border-radius:6px;display:block}
.tile:hover{border-color:var(--line2)}
.tile.on{border-color:var(--accent);box-shadow:0 0 0 3px var(--accentSoft)}
.tile span{white-space:nowrap;overflow:hidden;text-overflow:ellipsis;text-align:center}
.slots{display:flex;gap:6px;flex-wrap:wrap}
.slot{display:flex;align-items:center;gap:7px;padding:6px 10px 6px 6px;border:1.5px solid var(--line);border-radius:9px;font-size:12.5px;font-weight:500;background:#fff}
.slot i{width:22px;height:22px;border-radius:6px;border:1px solid rgba(0,0,0,.15);display:block}
.slot.on{border-color:var(--accent);box-shadow:0 0 0 3px var(--accentSoft)}
.swatches{display:grid;grid-template-columns:repeat(10,1fr);gap:5px;margin-top:10px}
.swatches button{aspect-ratio:1;border-radius:6px;border:1px solid rgba(0,0,0,.14)}
.swatches button.pick{background:conic-gradient(red,yellow,lime,cyan,blue,magenta,red)}
.swatches button:hover{transform:scale(1.12)}
.vh{position:absolute;width:1px;height:1px;opacity:0;pointer-events:none}
.slider{display:grid;grid-template-columns:1fr auto;gap:4px 8px;font-size:12.5px;color:var(--ink2);margin:12px 0 4px}
.slider output{font-variant-numeric:tabular-nums;color:var(--muted)}
.slider input{grid-column:1/-1;width:100%;accent-color:var(--accent)}
.check{display:flex;align-items:center;gap:8px;font-size:13px;margin:10px 0;color:var(--ink2)}
.check input{accent-color:var(--accent);width:16px;height:16px}
.sw{position:relative;display:inline-block;width:32px;height:18px;flex:none}
.sw input{opacity:0;width:0;height:0}
.sw span{position:absolute;inset:0;background:var(--line2);border-radius:20px;transition:.2s;cursor:pointer}
.sw span::after{content:"";position:absolute;width:14px;height:14px;left:2px;top:2px;border-radius:50%;background:#fff;transition:.2s}
.sw input:checked+span{background:var(--accent)}
.sw input:checked+span::after{transform:translateX(14px)}
.field{display:flex;flex-direction:column;gap:5px;margin:12px 0;font-size:12.5px;color:var(--ink2)}
.field input[type=text],.field select{height:36px;border:1.5px solid var(--line);border-radius:8px;padding:0 10px;font:inherit;font-size:14px;background:#fff;color:var(--ink)}
.field input[type=text]:focus,.field select:focus{outline:none;border-color:var(--accent)}
.row2{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.colorRow{display:flex;align-items:center;gap:8px}
.colorRow input[type=color]{width:40px;height:32px;border:1.5px solid var(--line);border-radius:8px;padding:2px;background:#fff}
.empty{color:var(--muted);font-size:13.5px;line-height:1.55;padding:22px 4px}
.layer{display:flex;align-items:center;gap:10px;padding:8px;border-radius:9px;border:1.5px solid transparent;cursor:pointer;margin-top:4px}
.layer:hover{background:var(--soft)}
.layer.on{border-color:var(--accent);background:#f0fdfa}
.layer .lt{width:34px;height:34px;border-radius:7px;background:var(--soft);display:grid;place-items:center;font-size:12px;font-weight:700;color:var(--ink2);overflow:hidden;flex:none}
.layer .lt img{max-width:100%;max-height:100%}
.layer .ln{flex:1;min-width:0}
.layer .ln b{display:block;font-size:13px;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.layer .ln small{color:var(--muted);font-size:11.5px}
.layer .lb{display:flex;gap:2px}
.layer .lb button{width:26px;height:26px;border-radius:6px;color:var(--muted)}
.layer .lb button:hover{background:#fff;color:var(--ink)}
.layer .lb svg{width:15px;height:15px}
.btnrow{display:flex;gap:8px;margin-top:14px}
.btn{flex:1;height:36px;border-radius:9px;border:1.5px solid var(--line);font-size:13px;font-weight:600;background:#fff}
.btn:hover{border-color:var(--line2)}
.btn.red{color:var(--danger)}
#toast{position:fixed;left:50%;bottom:24px;transform:translate(-50%,30px);background:var(--ink);color:#fff;padding:10px 16px;border-radius:10px;font-size:13.5px;opacity:0;transition:.25s;pointer-events:none;z-index:9}
#toast.show{opacity:1;transform:translate(-50%,0)}

@media (max-width:1100px){
  .stage{grid-template-columns:minmax(0,1fr) minmax(0,1fr) 290px}
  .actions .ghost span{display:none}
}
@media (max-width:440px){
  #btnSurprise,#redo{display:none}
  .seg button{padding:6px 7px}
}
@media (max-width:860px){
  body{overflow:auto;height:auto;min-height:100dvh;display:block}
  .top{position:sticky;top:0;z-index:5;height:54px;padding:0 10px;gap:8px}
  .brand{font-size:17px}
  .seg button{padding:6px 9px;font-size:12px}
  .actions{gap:2px}
  .actions button{padding:0 8px}
  .actions .primary span{display:none}
  .top{overflow:hidden}
  .brand .logo{padding:2px 5px}
  #btnOpen{display:none}
  .tools{position:sticky;top:54px;z-index:4}
  .stage,.stage.v3d,.stage.v2d{display:block}
  .pane{height:52vh;border-right:0;border-bottom:1px solid var(--line)}
  .stage.v3d .p3d,.stage.v2d .p2d{height:68vh}
  .panel{border-left:0}
  .tab{overflow:visible}
  .hint{display:none}
}

/* pattern library + DXF import */
.patRow{display:flex;gap:8px}
.patRow select{flex:1;min-width:0;height:36px;border:1.5px solid var(--line);border-radius:8px;padding:0 8px;font:inherit;font-size:13px;background:#fff}
.btn.primary{background:var(--accent);border-color:var(--accent);color:#fff}
.btn.primary:hover{background:var(--accent2)}
.btn.primary:disabled{opacity:.4;cursor:default}
.btn.sm{flex:none;height:34px;padding:0 12px;font-size:12.5px}
.note a,.link{color:var(--accent2);font-weight:600;text-decoration:underline;padding:0;font-size:inherit}
dialog#dxfDlg{border:0;border-radius:16px;padding:0;width:min(760px,96vw);max-height:92dvh;box-shadow:0 30px 80px rgba(15,23,32,.35);color:var(--ink)}
dialog#dxfDlg::backdrop{background:rgba(15,23,32,.55)}
.dlg{display:flex;flex-direction:column;max-height:92dvh;margin:0}
.dlg header{display:flex;align-items:center;justify-content:space-between;padding:16px 20px;border-bottom:1px solid var(--line)}
.dlg header h3{margin:0;font-size:17px}
.dlg .x{font-size:24px;line-height:1;color:var(--muted);width:34px;height:34px;border-radius:8px}
.dlg .x:hover{background:var(--soft)}
.dlgBody{padding:6px 20px 16px;overflow-y:auto}
.dlgBody h4{margin:16px 0 8px;font-size:11px;letter-spacing:.09em;text-transform:uppercase;color:var(--ink2)}
.dlg footer{display:flex;align-items:center;gap:8px;padding:14px 20px;border-top:1px solid var(--line)}
.dlg footer .btn{flex:none;padding:0 18px}
.dlgMsg{flex:1;font-size:12.5px;color:var(--muted);line-height:1.4}
.dlgMsg .err{color:var(--danger);font-weight:600}
.sizeEdit{display:flex;flex-wrap:wrap;gap:6px}
.sizeEdit input{width:64px;height:34px;border:1.5px solid var(--line);border-radius:8px;text-align:center;font:inherit;font-weight:600;font-size:13px}
.sizeEdit input:focus{outline:none;border-color:var(--accent)}
.impPieces{display:grid;gap:8px}
.impRow{display:flex;gap:12px;align-items:center;padding:8px;border:1.5px solid var(--line);border-radius:12px}
.impThumb{flex:none;background:var(--soft);border-radius:9px;display:grid;place-items:center;width:84px;height:84px}
.impMeta{flex:1;min-width:0}
.impMeta b{display:block;font-size:14px}
.impMeta small{color:var(--muted);font-size:12px}
.impCtl{display:flex;flex-wrap:wrap;align-items:center;gap:8px 12px;margin-top:6px}
.impCtl select{height:34px;border:1.5px solid var(--line);border-radius:8px;padding:0 8px;font:inherit;font-size:13px;background:#fff}
.impCtl .check{margin:0;font-size:12.5px}
@media (max-width:560px){.impRow{align-items:flex-start}.impThumb{width:64px;height:64px}.impThumb canvas{width:56px!important;height:56px!important}.dlg footer{flex-wrap:wrap}.dlgMsg{flex-basis:100%}}