:root {
  --bg: #f4f5f7; --card: #fff; --text: #1d2129; --muted: #86909c; --line: #e5e6eb;
  --primary: #165dff; --primary-d: #0e42d2; --danger: #cb2634; --warn: #d25f00; --ok: #00a870;
  --ref: #f2f3f5;
  --c-mouser: #0b5394; --c-digikey: #cc0000; --c-lcsc: #1f7a3a; --c-ickey: #d4380d; --c-manufacturer: #5b3cc4;
  --c-other: #4e5969;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; background: var(--bg); color: var(--text);
  font: 14px/1.5 -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif; }
button, input, textarea { font: inherit; }
[hidden] { display: none !important; }
.topbar { display: flex; align-items: center; justify-content: space-between; padding: 10px 16px;
  background: #fff; border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 5; }
.topbar h1 { font-size: 16px; margin: 0; }
.who { display: flex; gap: 8px; align-items: center; color: var(--muted); }
main { padding: 12px 16px; max-width: 1600px; margin: 0 auto; }
.panel { background: var(--card); border: 1px solid var(--line); border-radius: 8px; padding: 12px; margin-bottom: 12px; }
.login { max-width: 360px; margin: 40px auto; }
.login h2 { margin: 0 0 12px; font-size: 18px; }
label { display: block; color: var(--muted); font-size: 13px; }
label input, label textarea { display: block; width: 100%; margin-top: 4px; padding: 8px 10px; color: var(--text);
  border: 1px solid var(--line); border-radius: 6px; background: #fff; }
textarea { resize: vertical; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }
.login label { margin-bottom: 10px; }
.row { display: flex; gap: 12px; align-items: flex-end; flex-wrap: wrap; margin-top: 10px; }
.row > label { flex: 1 1 140px; }
.sort { display: flex; gap: 12px; align-items: center; flex: 1 1 auto; }
.sort label { display: inline-flex; gap: 4px; align-items: center; color: var(--text); font-size: 14px; }
.sort-title { color: var(--muted); font-size: 13px; }
button.primary { background: var(--primary); color: #fff; border: 0; border-radius: 6px; padding: 9px 22px; cursor: pointer; }
button.primary:hover { background: var(--primary-d); }
button:disabled { opacity: .55; cursor: not-allowed; }
button.link { background: none; border: 0; color: var(--primary); cursor: pointer; padding: 0; }
.err { color: var(--danger); margin-top: 8px; }
.msg { background: #fff7e8; border: 1px solid #ffd591; color: #874d00; padding: 8px 12px; border-radius: 6px; margin-bottom: 12px; }
.loading { display: flex; align-items: center; gap: 8px; color: var(--muted); padding: 12px 0; }
.spinner { width: 16px; height: 16px; border: 2px solid var(--line); border-top-color: var(--primary); border-radius: 50%;
  animation: spin .8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.mock-banner { background: #fff1f0; border: 1px solid #ffa39e; color: var(--danger); font-weight: 600;
  padding: 8px 12px; border-radius: 6px; margin-bottom: 12px; }

.card { background: var(--card); border: 1px solid var(--line); border-radius: 8px; margin-bottom: 14px; overflow: hidden; }
.card-head { padding: 10px 12px; border-bottom: 1px solid var(--line); }
.card-head .base { font-size: 18px; font-weight: 700; margin-right: 8px; }
.card-head .brand { color: var(--muted); }
.tags { margin-top: 6px; display: flex; flex-wrap: wrap; gap: 6px; }
.tag { display: inline-block; border: 1px solid var(--line); border-radius: 4px; padding: 0 6px; font-size: 12px; background: #fafafa; }
.tag.mode-mock { background: var(--danger); color: #fff; border-color: var(--danger); font-weight: 700; }
.tag.mode-sandbox { background: #fff7e8; color: var(--warn); border-color: #ffd591; }
.tag.mode-live { background: #e8ffea; color: var(--ok); border-color: #b7eb8f; }
.tag.ref { background: var(--ref); color: var(--muted); }
.rec { padding: 8px 12px; background: #f0f5ff; border-bottom: 1px solid var(--line); display: flex; flex-wrap: wrap; gap: 6px 18px; }
.rec b { color: var(--primary); }
.rec .none { color: var(--warn); }
.cols { display: flex; flex-direction: column; gap: 10px; padding: 10px; }
/* ≥900px 五列等宽并排；单列不窄于 200px，总宽不够时卡片内横向滚动 */
@media (min-width: 900px) {
  .cols { display: grid; grid-template-columns: repeat(5, minmax(200px, 1fr)); align-items: start; overflow-x: auto; }
  .col { min-width: 0; }
}
.col { border: 1px solid var(--line); border-radius: 6px; overflow: hidden; background: #fff; }
.col-head { display: flex; align-items: center; gap: 8px; padding: 6px 10px; color: #fff; background: var(--c-other); flex-wrap: wrap; }
.col-head.src-mouser { background: var(--c-mouser); }
.col-head.src-digikey { background: var(--c-digikey); }
.col-head.src-lcsc { background: var(--c-lcsc); }
.col-head.src-ickey { background: var(--c-ickey); }
.col-head.src-manufacturer { background: var(--c-manufacturer); }
.tag.mode-none { background: rgba(255,255,255,.18); color: #fff; border-color: rgba(255,255,255,.5); }
.col-disclaimer { padding: 6px 10px; background: #fff7e8; color: #874d00; font-size: 12px; border-bottom: 1px solid var(--line); }
.col-head .name { font-weight: 700; font-size: 15px; }
.col-head a { color: #fff; margin-left: auto; text-decoration: underline; }
.col-status { padding: 10px; color: var(--muted); }
.col-status.bad { color: var(--danger); }
.offer { padding: 8px 10px; border-top: 1px solid var(--line); }
.offer:first-of-type { border-top: 0; }
.offer.ref { background: var(--ref); color: #4e5969; }
.offer .pn { font-weight: 600; word-break: break-all; }
.offer .sub { color: var(--muted); font-size: 12px; word-break: break-all; }
.kv { display: grid; grid-template-columns: auto 1fr; gap: 2px 10px; margin: 6px 0; font-size: 13px; }
.kv dt { color: var(--muted); }
.kv dd { margin: 0; }
.calc { margin: 6px 0; padding: 6px 8px; background: #f7f8fa; border-radius: 4px; font-size: 13px; }
.calc .total { font-weight: 700; color: var(--text); }
.flag-red { color: var(--danger); font-size: 13px; margin: 4px 0; }
.flag-orange { color: var(--warn); font-size: 13px; margin: 4px 0; }
table.ladder { width: 100%; border-collapse: collapse; font-size: 12px; margin-top: 4px; }
table.ladder th, table.ladder td { border-bottom: 1px solid var(--line); padding: 3px 4px; text-align: right; }
table.ladder th:first-child, table.ladder td:first-child { text-align: left; }
table.ladder tr.hit td { background: #e8f3ff; font-weight: 600; }
.ladder-note { color: var(--muted); font-size: 12px; }
.muted { color: var(--muted); }
.history summary { cursor: pointer; font-weight: 600; }
.history-body { margin-top: 8px; }
.hist-row { display: block; width: 100%; text-align: left; padding: 6px 4px; border: 0; border-bottom: 1px solid var(--line);
  background: none; cursor: pointer; }
.hist-row:hover { background: #f7f8fa; }
.hist-row .t { color: var(--muted); font-size: 12px; margin-right: 8px; }
.hist-row .st { font-size: 12px; color: var(--muted); margin-left: 8px; }
.foot { padding: 14px 16px 28px; color: var(--muted); font-size: 12px; text-align: center; line-height: 1.8; }
.foot .usage { color: var(--text); }