:root{
  --color-primary:#334155;--color-primary-700:#1e293b;--color-on-primary:#fff;
  --color-secondary:#475569;--color-accent:#059669;--color-accent-700:#047857;
  --color-bg:#f8fafc;--color-surface:#fff;--color-fg:#0f172a;--color-muted:#64748b;
  --color-border:#e2e8f0;--color-danger:#dc2626;--color-warn:#d97706;
  --radius:10px;--radius-sm:7px;--shadow:0 1px 3px rgba(15,23,42,.08),0 1px 2px rgba(15,23,42,.04);
  --shadow-md:0 4px 12px rgba(15,23,42,.10);--sidebar-w:248px;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{font-family:'Fira Sans',system-ui,-apple-system,Segoe UI,Roboto,sans-serif;
  background:var(--color-bg);color:var(--color-fg);font-size:15px;line-height:1.55;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
h1,h2,h3{margin:0 0 .4rem;font-weight:600;letter-spacing:-.01em}

/* ---------- Layout ---------- */
.layout{display:flex;min-height:100dvh}
.sidebar{width:var(--sidebar-w);background:var(--color-primary-700);color:#cbd5e1;
  display:flex;flex-direction:column;position:fixed;inset:0 auto 0 0;z-index:40;transition:transform .25s ease}
.sidebar__brand{display:flex;align-items:center;gap:.6rem;padding:1.1rem 1.25rem;color:#fff;font-weight:700;font-size:1.05rem;border-bottom:1px solid rgba(255,255,255,.08)}
.sidebar__brand svg{flex:0 0 auto}
.sidebar__nav{padding:.75rem .6rem;overflow-y:auto;flex:1}
.nav-section{font-size:.7rem;text-transform:uppercase;letter-spacing:.08em;color:#64748b;padding:.9rem .65rem .35rem}
.nav-link{display:flex;align-items:center;gap:.7rem;padding:.6rem .65rem;border-radius:var(--radius-sm);
  color:#cbd5e1;font-size:.92rem;font-weight:500;margin-bottom:2px;transition:background .15s,color .15s;cursor:pointer}
.nav-link svg{width:18px;height:18px;flex:0 0 auto;opacity:.85}
.nav-link:hover{background:rgba(255,255,255,.06);color:#fff}
.nav-link.active{background:var(--color-accent);color:#fff}
.nav-link.active svg{opacity:1}
.sidebar__foot{padding:.85rem 1rem;border-top:1px solid rgba(255,255,255,.08);font-size:.8rem;color:#94a3b8}

.main{flex:1;margin-left:var(--sidebar-w);display:flex;flex-direction:column;min-width:0}
.topbar{position:sticky;top:0;z-index:30;background:rgba(248,250,252,.85);backdrop-filter:blur(8px);
  display:flex;align-items:center;gap:1rem;padding:.8rem 1.4rem;border-bottom:1px solid var(--color-border)}
.topbar h1{font-size:1.15rem;margin:0}
.topbar__spacer{flex:1}
.menu-toggle{display:none;background:none;border:none;cursor:pointer;padding:.3rem;color:var(--color-fg)}
.content{padding:1.4rem;max-width:1280px;width:100%}
.user-chip{display:flex;align-items:center;gap:.55rem;font-size:.85rem;color:var(--color-muted)}
.user-chip__avatar{width:32px;height:32px;border-radius:50%;background:var(--color-primary);color:#fff;
  display:grid;place-items:center;font-weight:600;font-size:.8rem}

/* ---------- Cards / KPI ---------- */
.grid{display:grid;gap:1rem}
.kpi-grid{grid-template-columns:repeat(auto-fit,minmax(200px,1fr))}
.card{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius);box-shadow:var(--shadow)}
.card__body{padding:1.1rem 1.25rem}
.card__head{padding:1rem 1.25rem;border-bottom:1px solid var(--color-border);display:flex;align-items:center;gap:.6rem}
.card__head h2{margin:0;font-size:1rem}
.kpi{display:flex;flex-direction:column;gap:.25rem}
.kpi__label{font-size:.78rem;color:var(--color-muted);text-transform:uppercase;letter-spacing:.04em}
.kpi__value{font-size:1.7rem;font-weight:700;letter-spacing:-.02em;font-variant-numeric:tabular-nums}
.kpi__icon{width:38px;height:38px;border-radius:9px;display:grid;place-items:center;background:#ecfdf5;color:var(--color-accent)}
.kpi--row{flex-direction:row;align-items:center;justify-content:space-between}

/* ---------- Buttons ---------- */
.btn{display:inline-flex;align-items:center;gap:.45rem;border:1px solid transparent;border-radius:var(--radius-sm);
  padding:.55rem .9rem;font-size:.9rem;font-weight:600;cursor:pointer;transition:background .15s,box-shadow .15s,transform .05s;font-family:inherit}
.btn:active{transform:translateY(1px)}
.btn svg{width:16px;height:16px}
.btn--primary{background:var(--color-accent);color:#fff}
.btn--primary:hover{background:var(--color-accent-700)}
.btn--dark{background:var(--color-primary);color:#fff}
.btn--dark:hover{background:var(--color-primary-700)}
.btn--ghost{background:transparent;border-color:var(--color-border);color:var(--color-fg)}
.btn--ghost:hover{background:#f1f5f9}
.btn--danger{background:#fef2f2;color:var(--color-danger);border-color:#fecaca}
.btn--danger:hover{background:#fee2e2}
.btn--sm{padding:.38rem .6rem;font-size:.82rem}
.btn--block{width:100%;justify-content:center}

/* ---------- Forms ---------- */
.form-grid{display:grid;gap:1rem;grid-template-columns:repeat(auto-fit,minmax(220px,1fr))}
.field{display:flex;flex-direction:column;gap:.35rem}
.field--full{grid-column:1/-1}
.field label{font-size:.82rem;font-weight:600;color:var(--color-secondary)}
.field .req{color:var(--color-danger)}
input,select,textarea{font-family:inherit;font-size:.92rem;padding:.6rem .7rem;border:1px solid var(--color-border);
  border-radius:var(--radius-sm);background:#fff;color:var(--color-fg);width:100%;transition:border-color .15s,box-shadow .15s}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--color-accent);box-shadow:0 0 0 3px rgba(5,150,105,.12)}
textarea{resize:vertical;min-height:80px}
.help{font-size:.78rem;color:var(--color-muted)}

/* ---------- Tables ---------- */
.table-wrap{overflow-x:auto}
table{width:100%;border-collapse:collapse;font-size:.9rem}
thead th{text-align:left;font-size:.74rem;text-transform:uppercase;letter-spacing:.05em;color:var(--color-muted);
  padding:.7rem .9rem;border-bottom:1px solid var(--color-border);white-space:nowrap}
tbody td{padding:.7rem .9rem;border-bottom:1px solid var(--color-border)}
tbody tr:hover{background:#f8fafc}
.num{text-align:right;font-variant-numeric:tabular-nums}

/* ---------- Badges ---------- */
.badge{display:inline-flex;align-items:center;gap:.3rem;padding:.2rem .55rem;border-radius:999px;font-size:.74rem;font-weight:600}
.badge--green{background:#ecfdf5;color:#047857}
.badge--gray{background:#f1f5f9;color:#475569}
.badge--red{background:#fef2f2;color:#dc2626}
.badge--amber{background:#fffbeb;color:#b45309}

/* ---------- Flash ---------- */
.flashes{position:fixed;top:1rem;right:1rem;z-index:100;display:flex;flex-direction:column;gap:.5rem;max-width:360px}
.flash{padding:.7rem 1rem;border-radius:var(--radius-sm);box-shadow:var(--shadow-md);font-size:.88rem;font-weight:500;
  display:flex;align-items:center;gap:.5rem;animation:slideIn .25s ease}
.flash--success{background:#ecfdf5;color:#065f46;border:1px solid #a7f3d0}
.flash--error{background:#fef2f2;color:#991b1b;border:1px solid #fecaca}
.flash--warning{background:#fffbeb;color:#92400e;border:1px solid #fde68a}
@keyframes slideIn{from{opacity:0;transform:translateX(12px)}to{opacity:1;transform:none}}

/* ---------- Page header ---------- */
.page-head{display:flex;align-items:center;gap:1rem;margin-bottom:1.2rem;flex-wrap:wrap}
.page-head h1{font-size:1.4rem;margin:0}
.page-head .sub{color:var(--color-muted);font-size:.9rem}
.page-head__actions{margin-left:auto;display:flex;gap:.5rem;flex-wrap:wrap}
.toolbar{display:flex;gap:.6rem;align-items:center;flex-wrap:wrap;margin-bottom:1rem}
.toolbar input,.toolbar select{width:auto;min-width:180px}
.empty{text-align:center;padding:3rem 1rem;color:var(--color-muted)}
.empty svg{opacity:.4;margin-bottom:.5rem}

/* ---------- Auth ---------- */
.auth{min-height:100dvh;display:grid;place-items:center;padding:1.5rem;
  background:linear-gradient(135deg,#1e293b,#334155)}
.auth__card{background:#fff;border-radius:16px;box-shadow:0 20px 50px rgba(2,6,23,.35);width:100%;max-width:400px;padding:2.2rem}
.auth__brand{display:flex;align-items:center;gap:.6rem;justify-content:center;margin-bottom:.4rem;font-weight:700;font-size:1.3rem;color:var(--color-primary)}
.auth h1{text-align:center;font-size:1.25rem}
.auth p.sub{text-align:center;color:var(--color-muted);margin-bottom:1.4rem;font-size:.9rem}

/* ---------- POS ---------- */
.pos{display:grid;grid-template-columns:1.4fr 1fr;gap:1rem;align-items:start}
.pos__cart{position:sticky;top:5rem}
.cart-item{display:flex;align-items:center;gap:.5rem;padding:.5rem 0;border-bottom:1px solid var(--color-border)}
.cart-item__name{flex:1;font-size:.88rem}
.cart-item input{width:64px;text-align:center}
.qty-stepper{display:flex;align-items:center;gap:.25rem}
.pos-total{display:flex;justify-content:space-between;font-size:1.05rem;padding:.4rem 0}
.pos-total--grand{font-size:1.5rem;font-weight:700;color:var(--color-accent);border-top:2px solid var(--color-primary);padding-top:.6rem;margin-top:.3rem}
.search-results{max-height:340px;overflow-y:auto;margin-top:.6rem}
.search-results button{width:100%;text-align:left;background:#fff;border:1px solid var(--color-border);border-radius:var(--radius-sm);
  padding:.55rem .7rem;margin-bottom:.4rem;cursor:pointer;display:flex;justify-content:space-between;gap:.5rem}
.search-results button:hover{border-color:var(--color-accent);background:#f0fdf4}
.search-results small{color:var(--color-muted)}

/* ---------- Responsive ---------- */
.backdrop{display:none;position:fixed;inset:0;background:rgba(2,6,23,.45);z-index:35}
@media(max-width:1024px){.pos{grid-template-columns:1fr}.pos__cart{position:static}}
@media(max-width:860px){
  .sidebar{transform:translateX(-100%)}
  body.nav-open .sidebar{transform:none}
  body.nav-open .backdrop{display:block}
  .main{margin-left:0}
  .menu-toggle{display:inline-grid;place-items:center}
  .content{padding:1rem}
}
@media(max-width:520px){
  .page-head__actions{width:100%}
  .kpi__value{font-size:1.4rem}
}