:root { --bg:#f5f6f8; --panel:#fff; --line:#e3e6ea; --ink:#222; --muted:#777;
  --ok:#1a9c4e; --bad:#d32f2f; --accent:#2563eb; }
* { box-sizing: border-box; }
/* hidden 必须真隐藏：.overlay 的 display:flex 会盖过 [hidden]，否则登录浮层
   登录成功后 hidden=true 也关不掉。 */
[hidden] { display: none !important; }
body { margin:0; font:14px/1.5 -apple-system,Segoe UI,Roboto,"PingFang SC",sans-serif;
  color:var(--ink); background:var(--bg); }
h1 { font-size:18px; margin:0; }
button { font:inherit; cursor:pointer; border:1px solid var(--line); background:#fff;
  border-radius:6px; padding:6px 12px; }
button.primary { background:var(--accent); color:#fff; border-color:var(--accent); }
button:disabled { opacity:.5; cursor:not-allowed; }
.topbar { display:flex; align-items:center; gap:12px; padding:10px 16px;
  background:var(--panel); border-bottom:1px solid var(--line); }
.topbar .spacer { flex:1; }
.layout { display:flex; gap:16px; padding:16px; align-items:flex-start; }
.panel { background:var(--panel); border:1px solid var(--line); border-radius:10px; padding:14px; }
.controls { width:280px; flex:none; }
.stage { flex:1; }
.field { margin-bottom:14px; }
.field > label { display:block; font-weight:600; margin-bottom:6px; }
.chips { display:flex; flex-wrap:wrap; gap:6px; }
.chip { border:1px solid var(--line); border-radius:999px; padding:4px 10px; cursor:pointer; user-select:none; }
.chip.on { background:var(--accent); color:#fff; border-color:var(--accent); }
select, input[type=text] { width:100%; padding:7px; border:1px solid var(--line); border-radius:6px; }
.tabs { display:flex; gap:8px; margin-bottom:10px; }
.tab { padding:6px 14px; border:1px solid var(--line); border-radius:6px 6px 0 0; background:#eef1f5; }
.tab.on { background:#fff; border-bottom-color:#fff; font-weight:600; }
.stage-viewport { border:1px solid var(--line); background:
  repeating-conic-gradient(#eceff3 0% 25%, #fff 0% 50%) 50%/24px 24px; overflow:auto; }
.canvas-wrap { position:relative; }
.clarity { margin-top:10px; padding:8px 10px; border-radius:6px; font-weight:600; }
.clarity.ok { background:#e6f6ec; color:var(--ok); }
.clarity.bad { background:#fdecec; color:var(--bad); }
.clarity.idle { background:#f0f0f0; color:var(--muted); }
.row { display:flex; gap:8px; align-items:center; }
.muted { color:var(--muted); }
.sku-preview { font-family:ui-monospace,SFMono-Regular,Menlo,monospace; background:#f7f8fa;
  border:1px solid var(--line); border-radius:6px; padding:8px; word-break:break-all; }
#result { white-space:pre-wrap; }
.overlay { position:fixed; inset:0; background:rgba(0,0,0,.45); display:flex;
  align-items:center; justify-content:center; }
.login-card { background:#fff; padding:24px; border-radius:12px; width:320px; }
.login-card .field { margin-bottom:12px; }
.err { color:var(--bad); min-height:18px; }