:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --surface-2: #f0f1f3;
  --border: #e6e8eb;
  --ink: #1a1d21;
  --ink-muted: #6b7280;
  --ink-faint: #9ca3af;
  --accent: #4f46e5;
  --accent-soft: #eef2ff;
  --success: #18794e;
  --warn: #b45309;
  --danger: #c0392b;
  --mono: ui-monospace, "SF Mono", Menlo, monospace;
  --shadow-sm: 0 1px 2px rgba(16,24,40,.06);
  --shadow: 0 4px 16px rgba(16,24,40,.08);
}
* { box-sizing: border-box; }
body { margin: 0; font-family: -apple-system, "Inter", "Segoe UI", system-ui, sans-serif; background: var(--bg); color: var(--ink); font-size: 14px; line-height: 1.5; -webkit-font-smoothing: antialiased; }
a { color: inherit; text-decoration: none; }
.num { font-variant-numeric: tabular-nums; }
.mono { font-family: var(--mono); }
.dim { color: var(--ink-muted); font-size: 12px; }
.t-r { text-align: right; }
.h1 { font-size: 20px; margin: 0 0 16px; font-weight: 650; }
.h2 { font-size: 15px; margin: 0 0 12px; font-weight: 620; }
.sub { color: var(--ink-muted); font-size: 13px; margin: 0 0 20px; }

/* app shell */
.app { display: flex; min-height: 100vh; }
.sidebar { width: 216px; flex-shrink: 0; background: var(--surface); border-right: 1px solid var(--border); display: flex; flex-direction: column; position: sticky; top: 0; height: 100vh; }
.brand { display: flex; align-items: center; gap: 9px; padding: 16px 18px; font-weight: 700; font-size: 15px; letter-spacing: .2px; }
.brand.center { justify-content: center; padding: 0 0 18px; }
.logo { width: 26px; height: 26px; border-radius: 7px; background: var(--accent); color: #fff; display: inline-flex; align-items: center; justify-content: center; font-weight: 800; font-size: 15px; }
.nav { display: flex; flex-direction: column; gap: 1px; padding: 8px; }
.nav a { padding: 8px 12px; border-radius: 7px; color: var(--ink-muted); font-weight: 520; font-size: 13.5px; }
.nav a:hover { background: var(--surface-2); color: var(--ink); }
.nav a.active { background: var(--accent-soft); color: var(--accent); font-weight: 620; }
.nav.foot { margin-top: auto; border-top: 1px solid var(--border); padding-top: 10px; }
.nav-group-label { font-size: 11px; text-transform: uppercase; letter-spacing: .06em; color: var(--ink-faint); font-weight: 650; padding: 12px 12px 4px; }
.sidebar-foot { margin-top: auto; padding: 12px 16px; border-top: 1px solid var(--border); }
.sub-banner { background: #fffbeb; color: #92400e; border-bottom: 1px solid #fde68a; padding: 8px 20px; font-size: 13px; }
.sub-banner.danger { background: #fef2f2; color: var(--danger); border-bottom-color: #fecaca; }

.main { flex: 1; min-width: 0; display: flex; flex-direction: column; }
.topbar { height: 56px; background: var(--surface); border-bottom: 1px solid var(--border); display: flex; align-items: center; padding: 0 20px; position: sticky; top: 0; z-index: 10; }
.tt { font-weight: 650; font-size: 15px; }
.topbar .right { margin-left: auto; display: flex; align-items: center; gap: 10px; }
.who { font-size: 13px; color: var(--ink-muted); }
.content { padding: 24px 28px; max-width: 1200px; width: 100%; }

/* pills / chips */
.pill { display: inline-block; padding: 2px 9px; border-radius: 999px; font-size: 11.5px; font-weight: 600; background: var(--surface-2); color: var(--ink-muted); }
.pill.tenant { background: var(--accent-soft); color: var(--accent); }
.pill.ok { background: #ecfdf3; color: var(--success); }
.chip { display: inline-block; padding: 1px 7px; margin: 1px 4px 1px 0; border-radius: 6px; font-size: 11px; font-weight: 600; font-family: var(--mono); background: var(--surface-2); border: 1px solid var(--border); }
.chip.warn { color: var(--warn); border-color: var(--warn); }

/* cards / stats */
.card { background: var(--surface); border: 1px solid var(--border); border-radius: 10px; padding: 18px; box-shadow: var(--shadow-sm); margin-bottom: 18px; }
.summary-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: 14px; margin-bottom: 18px; }
.stat { background: var(--surface); border: 1px solid var(--border); border-radius: 10px; padding: 16px; box-shadow: var(--shadow-sm); }
.stat .t { font-size: 12px; color: var(--ink-muted); }
.stat .v { font-size: 24px; font-weight: 660; margin-top: 4px; }
.stat .s { font-size: 12px; color: var(--ink-faint); margin-top: 2px; }

/* table */
table { width: 100%; border-collapse: collapse; font-size: 13px; }
th { text-align: left; padding: 8px 10px; color: var(--ink-muted); font-weight: 550; border-bottom: 1px solid var(--border); font-size: 12px; white-space: nowrap; }
td { padding: 9px 10px; border-bottom: 1px solid var(--surface-2); vertical-align: top; }
tbody tr:last-child td { border-bottom: none; }

/* filter bar */
.filter-bar { margin-bottom: 16px; }
.row { display: flex; gap: 10px; align-items: center; }
.grow { flex: 1; }
.search { flex: 1; min-width: 160px; padding: 8px 12px; border: 1px solid var(--border); border-radius: 8px; font-size: 13.5px; background: var(--surface); }
.select { padding: 8px 10px; border: 1px solid var(--border); border-radius: 8px; font-size: 13.5px; background: var(--surface); }

/* buttons */
.btn { display: inline-flex; align-items: center; gap: 6px; padding: 8px 14px; border-radius: 8px; border: 1px solid var(--border); background: var(--surface); color: var(--ink); font-size: 13px; font-weight: 560; cursor: pointer; }
.btn:hover { background: var(--surface-2); }
.btn-primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn-primary:hover { background: #4338ca; }
.btn-ghost { background: transparent; border-color: transparent; color: var(--ink-muted); }
.btn-ghost:hover { background: var(--surface-2); color: var(--ink); }
.btn-sm { padding: 5px 10px; font-size: 12.5px; border-radius: 7px; }

/* forms */
.field { margin-bottom: 14px; }
.field label { display: block; font-size: 12.5px; font-weight: 550; color: var(--ink-muted); margin-bottom: 5px; }
.field input, .field select { width: 100%; padding: 9px 12px; border: 1px solid var(--border); border-radius: 8px; font-size: 14px; }
.field input:focus, .field select:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(79,70,229,.12); }

/* alerts / banners */
.alert { background: #fef2f2; color: var(--danger); border: 1px solid #fecaca; border-radius: 8px; padding: 10px 14px; font-size: 13px; margin-bottom: 14px; }
.banner { background: var(--accent-soft); color: #3730a3; border: 1px solid #c7d2fe; border-radius: 8px; padding: 10px 14px; font-size: 13px; margin-bottom: 16px; }
.banner.danger { background: #fef2f2; color: var(--danger); border-color: #fecaca; }
.empty { color: var(--ink-faint); text-align: center; padding: 30px 0; }

/* login */
.login-body { display: flex; align-items: center; justify-content: center; min-height: 100vh; background: linear-gradient(160deg, #eef2ff, #f6f7f9); }
.login-card { width: 360px; background: var(--surface); border: 1px solid var(--border); border-radius: 14px; padding: 30px; box-shadow: var(--shadow); }

/* POS */
.pos { display: grid; grid-template-columns: 1fr 440px; gap: 16px; align-items: start; }
.pos-left, .pos-right { min-width: 0; }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.results { margin-top: 12px; max-height: 68vh; overflow-y: auto; display: flex; flex-direction: column; gap: 8px; }
.res-item { border: 1px solid var(--border); border-radius: 8px; padding: 10px 12px; background: var(--surface); }
.ri-label { font-size: 13.5px; }
.ri-price { font-size: 12px; }
.ri-lots { margin-top: 6px; display: flex; flex-wrap: wrap; gap: 4px; }
.chip.lot { cursor: pointer; background: var(--accent-soft); color: var(--accent); border-color: #c7d2fe; font-size: 11.5px; padding: 3px 9px; }
.chip.lot:hover { background: #e0e7ff; }
.chip.lot.svc { background: var(--surface-2); color: var(--ink-muted); border-color: var(--border); }
.cart { margin-bottom: 12px; }
.cart td { vertical-align: middle; }
.mini { width: 100%; padding: 5px 6px; border: 1px solid var(--border); border-radius: 6px; font-size: 13px; text-align: right; }
.totals { display: flex; flex-direction: column; gap: 6px; margin-bottom: 12px; padding-top: 8px; border-top: 1px solid var(--border); }
.trow { display: flex; justify-content: space-between; align-items: center; font-size: 13.5px; }
.trow.grand { font-size: 16px; font-weight: 700; }
.trow.grand b { color: var(--accent); }
.toast { margin-top: 12px; padding: 10px 14px; border-radius: 8px; font-size: 13px; }
.toast.ok { background: #ecfdf3; color: var(--success); border: 1px solid #a7f3d0; }
.toast.err { background: #fef2f2; color: var(--danger); border: 1px solid #fecaca; }

/* ลูกค้า (POS) */
.cust-row { display: flex; gap: 8px; align-items: center; }
.cust-row input { flex: 1; padding: 9px 12px; border: 1px solid var(--border); border-radius: 8px; font-size: 14px; }
.cust-row input:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(79,70,229,.12); }
.cust-results { margin-top: 6px; border: 1px solid var(--border); border-radius: 8px; max-height: 220px; overflow: auto; background: var(--surface); }
.cres { padding: 8px 12px; cursor: pointer; font-size: 13px; border-bottom: 1px solid var(--border); }
.cres:hover { background: var(--surface-2); }
.cres:last-child { border-bottom: none; }
.cust-sel { margin-top: 8px; padding: 8px 12px; border: 1px solid var(--border); border-radius: 8px; background: var(--surface-2); display: flex; align-items: center; gap: 10px; font-size: 13px; }
.cust-sel b { margin-right: auto; }
.modal-overlay { position: fixed; inset: 0; background: rgba(15,17,21,.45); display: flex; align-items: flex-start; justify-content: center; padding: 40px 16px; z-index: 100; overflow: auto; }
.modal { background: var(--surface); border-radius: 14px; padding: 20px; width: 100%; max-width: 560px; box-shadow: 0 20px 50px rgba(0,0,0,.25); }
.modal-foot { display: flex; justify-content: flex-end; gap: 10px; margin-top: 16px; }

@media (max-width: 760px) {
  .sidebar { display: none; }
  .content { padding: 16px; }
  .pos { grid-template-columns: 1fr; }
  .field-row { grid-template-columns: 1fr; }
}