:root{
  --primary:#2563eb;--primary-dark:#1d4ed8;--danger:#dc2626;
  --bg:#f3f6fb;--card:#ffffff;--text:#0f172a;--soft:#64748b;
  --border:#e2e8f0;--border-soft:#eef2f7;--head:#f8fafc;--hover:#f8fbff;--table-head:#eaf2ff;--table-head-strong:#dbeafe;--table-head-text:#1e3a8a;--table-head-border:#93c5fd;
}
*{box-sizing:border-box}
html{background:var(--bg)}
body{margin:0;min-height:100vh;background:var(--bg);color:var(--text);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;font-size:13px}
button,input,select{font:inherit}
[hidden]{display:none!important}

/* Login */
.auth-shell{min-height:100vh;display:grid;place-items:center;padding:24px}
.auth-card{width:min(400px,100%);background:var(--card);border:1px solid var(--border);border-radius:16px;padding:28px;box-shadow:0 8px 24px rgba(15,23,42,.06)}
.auth-brand{display:flex;align-items:center;gap:10px;margin-bottom:24px}
.auth-brand>div:last-child{display:grid;gap:1px}.auth-brand strong{font-size:14px}.auth-brand span{font-size:11px;color:var(--soft)}
.brand-mark{width:40px;height:40px;border-radius:11px;background:#eff6ff;color:var(--primary);border:1px solid #dbeafe;display:grid;place-items:center;font-weight:800;letter-spacing:-.04em}
.brand-mark.small{width:38px;height:38px;border-radius:10px;flex:0 0 auto}
.auth-card h1{font-size:22px;letter-spacing:-.03em;margin:0 0 7px}.auth-card>p{margin:0 0 22px;color:var(--soft);line-height:1.55}
.auth-card form{display:grid;gap:14px}.auth-card label{display:grid;gap:6px;color:#334155;font-size:12px;font-weight:600}
.auth-card input{height:42px;border:1px solid var(--border);border-radius:9px;padding:0 12px;outline:none;background:#fff;color:var(--text)}
.auth-card input:focus,.toolbar input:focus,.toolbar select:focus{border-color:#93c5fd;box-shadow:0 0 0 3px rgba(37,99,235,.08)}
.auth-card button{height:42px;border:0;border-radius:9px;background:var(--primary);color:#fff;font-weight:700;cursor:pointer;margin-top:2px}.auth-card button:hover{background:var(--primary-dark)}
.auth-card button:disabled,.btn:disabled{opacity:.55;cursor:not-allowed}
.back-link{display:inline-block;margin-top:18px;color:var(--primary);text-decoration:none;font-size:12px}.back-link:hover{text-decoration:underline}
.message{margin-top:14px;padding:10px 11px;border:1px solid #fecaca;background:#fff7f7;color:#991b1b;border-radius:8px;font-size:12px}

/* App */
.app-shell{width:min(1780px,calc(100% - 32px));margin:0 auto;padding:18px 0 40px}
.topbar{min-height:56px;display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:14px}
.title-wrap{display:flex;align-items:center;gap:11px;min-width:0}.title-line{display:flex;align-items:center;gap:10px;flex-wrap:wrap}.title-line h1{margin:0;font-size:20px;line-height:1.2;letter-spacing:-.03em}.title-wrap p{margin:4px 0 0;color:var(--soft);font-size:11px}
.live-status{display:inline-flex;align-items:center;gap:6px;color:var(--soft);font-size:11px;font-weight:600}.live-status i{width:7px;height:7px;border-radius:50%;background:var(--primary)}.live-status.offline{color:var(--danger)}.live-status.offline i{background:var(--danger)}
.top-actions{display:flex;align-items:center;gap:7px;flex-wrap:wrap;justify-content:flex-end}.auto-label{font-size:11px;color:var(--soft);padding:0 5px}
.btn{height:36px;border:1px solid var(--border);border-radius:8px;padding:0 12px;background:#fff;color:#334155;text-decoration:none;display:inline-flex;align-items:center;justify-content:center;gap:6px;font-weight:650;cursor:pointer;white-space:nowrap}.btn:hover{border-color:#cbd5e1;background:var(--head)}.btn.primary{border-color:var(--primary);background:var(--primary);color:#fff}.btn.primary:hover{background:var(--primary-dark);border-color:var(--primary-dark)}

.summary-strip{display:flex;align-items:stretch;background:var(--card);border:1px solid var(--border);border-radius:12px;overflow-x:auto;margin-bottom:12px;box-shadow:0 1px 2px rgba(15,23,42,.025)}
.summary-item{min-width:126px;flex:1;padding:13px 16px;border-right:1px solid var(--border-soft);display:grid;gap:4px}.summary-item:last-child{border-right:0}.summary-item span{font-size:10px;text-transform:uppercase;letter-spacing:.04em;color:var(--soft);font-weight:700;white-space:nowrap}.summary-item strong{font-size:20px;line-height:1.15;letter-spacing:-.02em}.summary-item.primary strong{color:var(--primary)}.summary-item.asset{min-width:170px}

.sheet-panel{background:var(--card);border:1px solid var(--border);border-radius:12px;overflow:hidden;box-shadow:0 1px 2px rgba(15,23,42,.025)}
.sheet-head{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:14px 16px;border-bottom:1px solid var(--border-soft)}.sheet-head h2{font-size:14px;margin:0 0 4px}.sheet-head p{font-size:11px;color:var(--soft);margin:0;line-height:1.4}.update-info{text-align:right;display:grid;gap:2px;flex:0 0 auto}.update-info span{font-size:9px;text-transform:uppercase;letter-spacing:.05em;color:#94a3b8;font-weight:700}.update-info strong{font-size:11px;color:#475569;font-weight:650}
.toolbar{display:grid;grid-template-columns:minmax(220px,2fr) repeat(3,minmax(140px,1fr)) auto;gap:8px;align-items:end;padding:12px 16px;border-bottom:1px solid var(--border-soft);background:#fff}.toolbar label{display:grid;gap:5px;min-width:0}.toolbar label>span{font-size:10px;color:var(--soft);font-weight:700}.toolbar input,.toolbar select{height:36px;width:100%;border:1px solid var(--border);border-radius:8px;padding:0 10px;background:#fff;color:#334155;outline:none;min-width:0}.toolbar .btn{height:36px}
.sheet-subbar{min-height:35px;padding:8px 16px;border-bottom:1px solid var(--border-soft);display:flex;align-items:center;justify-content:space-between;gap:12px;color:var(--soft);font-size:10.5px}.baseline-help{white-space:nowrap}

.sheet-state{min-height:128px;display:flex;align-items:center;justify-content:center;gap:9px;color:var(--soft);font-size:12px}.sheet-state.error{color:var(--danger);flex-direction:column}.inline-loader{width:13px;height:13px;border:2px solid #dbeafe;border-top-color:var(--primary);border-radius:50%;animation:spin .75s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}
.stock-sheet{width:100%;overflow:auto;max-height:calc(100vh - 300px);min-height:240px;background:#fff}
.stock-table{border-collapse:separate;border-spacing:0;width:max-content;min-width:100%;table-layout:fixed;font-size:11.5px}
.stock-table th,.stock-table td{border-right:1px solid var(--border-soft);border-bottom:1px solid var(--border-soft);padding:7px 8px;vertical-align:middle;background:#fff;white-space:nowrap;height:42px}.stock-table th:last-child,.stock-table td:last-child{border-right:0}
.stock-table thead th{position:sticky;top:0;z-index:20;background:var(--table-head);color:var(--table-head-text);font-size:10px;text-transform:uppercase;letter-spacing:.035em;font-weight:800;text-align:center;height:38px;border-bottom:1px solid var(--table-head-border);box-shadow:0 1px 0 rgba(37,99,235,.08)}
.stock-table tbody tr:hover td{background:var(--hover)}
.stock-table .col-no{width:48px;min-width:48px;max-width:48px;text-align:center;color:#94a3b8}.stock-table .col-product{width:260px;min-width:260px;max-width:260px;text-align:left}.stock-table .col-category{width:145px;min-width:145px;max-width:145px;text-align:left}.stock-table .col-color{width:125px;min-width:125px;max-width:125px;text-align:left}.stock-table .size-col{width:92px;min-width:92px;max-width:92px;text-align:center}.stock-table .col-total{width:84px;min-width:84px;max-width:84px;text-align:center}.stock-table .col-status{width:90px;min-width:90px;max-width:90px;text-align:left}.stock-table .col-asset{width:135px;min-width:135px;max-width:135px;text-align:right}
/* freeze first columns like spreadsheet */
.stock-table .freeze-1{position:sticky;left:0;z-index:3}.stock-table .freeze-2{position:sticky;left:48px;z-index:3}.stock-table .freeze-3{position:sticky;left:308px;z-index:3}.stock-table .freeze-4{position:sticky;left:453px;z-index:3;box-shadow:1px 0 0 var(--border)}
.stock-table thead .freeze-1,.stock-table thead .freeze-2,.stock-table thead .freeze-3,.stock-table thead .freeze-4{z-index:30;background:var(--table-head-strong);color:var(--table-head-text)}
.stock-table tbody tr:hover .freeze-1,.stock-table tbody tr:hover .freeze-2,.stock-table tbody tr:hover .freeze-3,.stock-table tbody tr:hover .freeze-4{background:var(--hover)}
.product-name{font-weight:700;color:var(--text);overflow:hidden;text-overflow:ellipsis}.product-meta{margin-top:2px;color:#94a3b8;font-size:9.5px;display:flex;gap:7px;align-items:center;overflow:hidden}.product-baseline{color:var(--primary);overflow:hidden;text-overflow:ellipsis}.category-text,.color-text{overflow:hidden;text-overflow:ellipsis;color:#475569}.color-text{font-weight:600}
.qty-stack{display:grid;justify-items:center;gap:2px;line-height:1.1}.qty{font-size:13px;font-weight:750;color:var(--text)}.qty.low,.qty.zero,.qty.negative{color:var(--danger)}.cell-na{color:#cbd5e1;text-align:center}.baseline-mini{display:block;max-width:84px;overflow:hidden;text-overflow:ellipsis;color:var(--primary);font-size:8.7px;font-weight:600}.baseline-mini em{font-style:normal;color:#64748b}.delta-minus{color:var(--danger)}.delta-plus,.delta-flat{color:var(--primary)}
.total-value{font-size:13px;font-weight:800;color:var(--text)}.status-text{font-size:10px;font-weight:650;color:#64748b}.status-text.alert{color:var(--danger)}.asset-value{text-align:right;font-weight:650;color:#334155}.empty-results{padding:28px;text-align:center;color:var(--soft)}

@media(max-width:980px){.toolbar{grid-template-columns:1fr 1fr}.toolbar .search-control{grid-column:1/-1}.toolbar .btn{width:100%}.baseline-help{display:none}.stock-sheet{max-height:calc(100vh - 360px)}.stock-table .freeze-3,.stock-table .freeze-4{position:static;box-shadow:none}.stock-table thead .freeze-3,.stock-table thead .freeze-4{position:sticky;top:0}.stock-table .freeze-2{box-shadow:1px 0 0 var(--border)}}
@media(max-width:640px){.app-shell{width:100%;padding:0 0 24px}.topbar{padding:12px 12px 8px;margin:0}.brand-mark.small{display:none}.title-line h1{font-size:18px}.top-actions .auto-label,.top-actions a{display:none}.summary-strip{border-left:0;border-right:0;border-radius:0;margin-bottom:8px}.summary-item{min-width:112px;padding:11px 13px}.summary-item strong{font-size:18px}.sheet-panel{border-left:0;border-right:0;border-radius:0}.sheet-head{padding:12px}.toolbar{padding:10px 12px;grid-template-columns:1fr 1fr}.sheet-subbar{padding:8px 12px}.stock-sheet{max-height:calc(100vh - 345px)}.stock-table .col-product{width:210px;min-width:210px;max-width:210px}.stock-table .freeze-2{left:48px}.stock-table .freeze-3,.stock-table .freeze-4{position:static}.auth-card{padding:24px 20px;border-radius:14px}}

/* V8: single spreadsheet scroll area + true sticky colored table header */
.stock-sheet{overflow:auto;padding:0;background:#fff;scrollbar-gutter:stable}
.size-group{background:#fff;width:max-content;min-width:100%}
.size-group+.size-group{border-top:8px solid var(--bg)}
.size-group-head{min-height:38px;padding:8px 12px;display:flex;align-items:center;justify-content:space-between;gap:12px;border-bottom:1px solid var(--border);background:#f8fafc;color:#334155}
.size-group-head strong{font-size:11px;font-weight:800;letter-spacing:.01em}
.size-group-head span{font-size:10px;color:var(--soft);white-space:nowrap}
/* Horizontal + vertical scrolling lives on .stock-sheet. This lets THEAD stick to the visible top. */
.table-scroll{width:max-content;min-width:100%;overflow:visible;background:#fff}
.stock-table thead{position:relative;z-index:19}
.stock-table thead th:first-child{border-left:0}
.stock-table thead th{background-clip:padding-box}
.stock-table thead th.col-total,.stock-table thead th.col-status,.stock-table thead th.col-asset{background:#e3efff}
.cell-empty{background:#fff!important}
.stock-table td.size-col .qty{display:inline-block;min-width:24px;text-align:center}
.stock-table tbody tr:hover .cell-empty{background:var(--hover)!important}
@media(max-width:640px){.size-group-head{padding:8px 12px}.size-group-head span{display:none}}