:root {
  --bg: #0f1115; --panel: #181b22; --panel-2: #20242e; --line: #2a2f3a;
  --text: #e7e9ee; --muted: #9aa3b2; --accent: #3ddc97; --accent-d: #2bb67c;
  --danger: #ff5d5d; --warn: #ffb020; --radius: 14px;
}
* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body {
  background: var(--bg); color: var(--text);
  font: 15px/1.5 ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
}
button { font: inherit; cursor: pointer; }

/* top bar */
#topbar {
  display: flex; align-items: center; justify-content: space-between;
  gap: 12px; padding: 10px 16px; border-bottom: 1px solid var(--line);
  position: sticky; top: 0; background: rgba(15,17,21,.92); backdrop-filter: blur(8px); z-index: 10;
}
#topbar .brand { background: none; border: 0; color: var(--text); font-weight: 800; font-size: 17px; letter-spacing: -.02em; }
#topbar nav { display: flex; gap: 6px; }
.navbtn { background: var(--panel-2); border: 1px solid var(--line); color: var(--text); padding: 7px 12px; border-radius: 10px; }
.navbtn.ghost { background: none; color: var(--muted); }
.navbtn:hover { border-color: #3a4150; }

main { max-width: 880px; margin: 0 auto; padding: 18px 16px 48px; }

/* spinner */
.spinner { width: 26px; height: 26px; margin: 60px auto; border: 3px solid var(--line); border-top-color: var(--accent); border-radius: 50%; animation: spin .8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

/* login */
.auth { max-width: 360px; margin: 8vh auto 0; }
.auth h1 { font-size: 22px; letter-spacing: -.02em; margin: 0 0 4px; }
.auth p.sub { color: var(--muted); margin: 0 0 22px; }
.field { margin-bottom: 12px; }
.field label { display: block; font-size: 13px; color: var(--muted); margin-bottom: 5px; }
input[type=email], input[type=password], input[type=text] {
  width: 100%; padding: 11px 12px; background: var(--panel); border: 1px solid var(--line);
  border-radius: 10px; color: var(--text); outline: none;
}
input:focus { border-color: var(--accent-d); }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  background: var(--accent); color: #06120c; border: 0; padding: 11px 16px; border-radius: 10px; font-weight: 700; width: 100%; }
.btn:hover { background: var(--accent-d); }
.btn[disabled] { opacity: .5; cursor: default; }
.btn.secondary { background: var(--panel-2); color: var(--text); border: 1px solid var(--line); width: auto; }
.err { color: var(--danger); font-size: 14px; min-height: 18px; margin: 8px 0 0; }

/* toolbar / search */
.toolbar { display: flex; gap: 10px; align-items: center; margin-bottom: 14px; flex-wrap: wrap; }
.toolbar .grow { flex: 1 1 220px; }
.select { padding: 10px 12px; background: var(--panel); border: 1px solid var(--line); border-radius: 10px; color: var(--text); max-width: 220px; }
.select:focus { border-color: var(--accent-d); outline: none; }
.chk { display: inline-flex; align-items: center; gap: 7px; color: var(--muted); font-size: 14px; user-select: none; padding: 8px 4px; }
.chk input { width: 16px; height: 16px; accent-color: var(--accent); }
.navbtn.import { position: relative; overflow: hidden; }
.muted { color: var(--muted); }
.count { color: var(--muted); font-size: 13px; margin-bottom: 14px; }

/* card hover lift */
.card { transition: transform .12s ease, border-color .12s ease; }
.card:hover { transform: translateY(-2px); border-color: #39414f; }

/* infinite-scroll sentinel: a thin tripwire below the grid; its spinner only
   shows while a page is in flight. */
.sentinel { height: 1px; }
.sentinel .spinner { display: none; margin: 18px auto; }
.sentinel.on .spinner { display: block; }

/* product grid */
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 12px; }
.card { position: relative; background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; text-align: left; color: inherit; padding: 0; display: flex; flex-direction: column; }
.selbox { position: absolute; top: 8px; left: 8px; z-index: 2; width: 24px; height: 24px; border-radius: 7px; border: 2px solid #fff; background: rgba(0,0,0,.35); cursor: pointer; padding: 0; }
.selbox:hover { background: rgba(0,0,0,.55); }
.selbox.on { background: var(--accent); border-color: var(--accent); }
.selbox.on::after { content: "✓"; color: #06120c; font-weight: 900; font-size: 15px; line-height: 20px; display: block; }
.card .thumb { aspect-ratio: 1; background: var(--panel-2) center/cover no-repeat; }
.card .body { padding: 10px 11px 12px; display: flex; flex-direction: column; gap: 4px; }
.card .name { font-size: 13px; line-height: 1.3; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.card .meta { display: flex; align-items: center; justify-content: space-between; gap: 6px; margin-top: 2px; }
.code { font-weight: 800; letter-spacing: -.01em; font-variant-numeric: tabular-nums; }
.price { color: var(--muted); font-size: 13px; }

/* stock badge */
.stock { display: inline-flex; align-items: center; gap: 6px; font-size: 12px; font-weight: 700; padding: 3px 9px; border-radius: 999px; }
.stock .dot { width: 8px; height: 8px; border-radius: 50%; }
.stock.in { background: rgba(61,220,151,.13); color: var(--accent); } .stock.in .dot { background: var(--accent); }
.stock.low { background: rgba(255,176,32,.13); color: var(--warn); } .stock.low .dot { background: var(--warn); }
.stock.out { background: rgba(255,93,93,.13); color: var(--danger); } .stock.out .dot { background: var(--danger); }
.stock.unknown { background: var(--panel-2); color: var(--muted); } .stock.unknown .dot { background: var(--muted); }

/* product page */
.product { display: grid; grid-template-columns: 1fr; gap: 18px; }
@media (min-width: 620px) { .product { grid-template-columns: 300px 1fr; } }
.product .hero { width: 100%; aspect-ratio: 1; background: var(--panel-2) center/cover no-repeat; border-radius: var(--radius); border: 1px solid var(--line); }
.product h1 { font-size: 20px; letter-spacing: -.02em; margin: 0 0 6px; }
.kv { display: grid; grid-template-columns: auto 1fr; gap: 4px 14px; margin: 14px 0; font-size: 14px; }
.kv dt { color: var(--muted); } .kv dd { margin: 0; }
.bigcode { font-size: 34px; font-weight: 800; letter-spacing: -.02em; }
.actions { display: flex; gap: 10px; margin-top: 18px; flex-wrap: wrap; }
.back { background: none; border: 0; color: var(--muted); padding: 4px 0; margin-bottom: 6px; }
.note { background: var(--panel); border: 1px dashed var(--line); border-radius: 10px; padding: 12px 14px; color: var(--muted); font-size: 13px; }
.center { text-align: center; padding: 40px 0; color: var(--muted); }
.hidden { display: none; }

/* floating selection / print action bar */
.actionbar { position: fixed; left: 50%; bottom: 18px; transform: translateX(-50%); z-index: 20;
  display: flex; align-items: center; gap: 12px; padding: 10px 12px 10px 18px;
  background: var(--panel-2); border: 1px solid var(--line); border-radius: 999px;
  box-shadow: 0 10px 30px rgba(0,0,0,.45); }
.actionbar[hidden] { display: none; }
.actionbar .selcount { font-weight: 700; font-size: 14px; }
.actionbar .btn { padding: 9px 14px; }
.actionbar .btn.secondary { padding: 9px 14px; }

/* print config modal */
.modal-backdrop { position: fixed; inset: 0; z-index: 50; display: flex; align-items: center; justify-content: center;
  background: rgba(0,0,0,.55); backdrop-filter: blur(2px); padding: 16px; }
.modal { width: 100%; max-width: 400px; background: var(--panel); border: 1px solid var(--line);
  border-radius: 16px; padding: 22px; box-shadow: 0 20px 60px rgba(0,0,0,.5); }
.modal h2 { margin: 0 0 16px; font-size: 18px; letter-spacing: -.02em; }
.select.full { max-width: none; width: 100%; }

/* product-set picker */
.setlist { display: flex; flex-direction: column; gap: 6px; max-height: 50vh; overflow: auto; }
.setrow { display: flex; align-items: center; justify-content: space-between; gap: 10px; text-align: left;
  background: var(--panel-2); border: 1px solid var(--line); color: var(--text); padding: 12px 13px; border-radius: 10px; font-weight: 600; }
.setrow:hover { border-color: var(--accent-d); }