:root{
  --bg:#F8FAFC; --card:#FFFFFF; --border:#E2E8F0;
  --primary:#2563EB; --primary-hover:#1D4ED8;
  --title:#0F172A; --body:#334155; --muted:#94A3B8;
  --ok-t:#16A34A; --ok-b:#DCFCE7; --warn-t:#B45309; --warn-b:#FEF3C7;
  --info-t:#2563EB; --info-b:#DBEAFE; --neu-t:#475569; --neu-b:#F1F5F9;
  --danger:#DC2626; --danger-b:#FEE2E2;
  --shadow:0 1px 3px rgba(15,23,42,.06), 0 1px 2px rgba(15,23,42,.04);
  --radius-card:16px; --radius:8px;
  --sidebar-w:248px;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  font-family:'Roboto',system-ui,-apple-system,Segoe UI,sans-serif;
  background:var(--bg); color:var(--body); font-size:14px; line-height:1.5;
  -webkit-font-smoothing:antialiased;
}
.mono{font-family:'Fira Code',ui-monospace,Menlo,monospace}
h1,h2,h3,h4{color:var(--title);margin:0}
a{color:var(--primary);text-decoration:none}
button{font-family:inherit}
.hidden{display:none !important}

/* ---------- Layout ---------- */
.app{display:flex;min-height:100vh}
.sidebar{
  width:var(--sidebar-w);background:var(--card);border-right:1px solid var(--border);
  display:flex;flex-direction:column;position:fixed;top:0;bottom:0;left:0;z-index:40;
  transition:transform .2s ease;
}
.sidebar .brand{padding:22px 20px;border-bottom:1px solid var(--border)}
.sidebar .brand h1{font-size:18px;font-weight:700;letter-spacing:.5px}
.sidebar .brand .sub{font-size:11px;color:var(--muted);text-transform:uppercase;letter-spacing:1px;margin-top:2px}
.nav{padding:12px;overflow-y:auto;flex:1}
.nav .group{font-size:11px;color:var(--muted);text-transform:uppercase;letter-spacing:1px;padding:14px 12px 6px}
.nav a{
  display:flex;align-items:center;gap:10px;padding:10px 12px;border-radius:var(--radius);
  color:var(--body);font-weight:500;margin-bottom:2px;transition:background .15s,color .15s;cursor:pointer;
}
.nav a:hover{background:var(--neu-b)}
.nav a.active{background:var(--info-b);color:var(--primary);font-weight:700}
.nav a .ic{width:18px;text-align:center;font-size:15px}
.sidebar .foot{padding:14px;border-top:1px solid var(--border)}

.main{flex:1;margin-left:var(--sidebar-w);display:flex;flex-direction:column;min-width:0}
.topbar{
  background:var(--card);border-bottom:1px solid var(--border);padding:14px 24px;
  display:flex;align-items:center;gap:16px;position:sticky;top:0;z-index:30;
}
.topbar .page-title{font-size:20px;font-weight:700}
.topbar .spacer{flex:1}
.hamburger{display:none;background:none;border:1px solid var(--border);border-radius:var(--radius);width:38px;height:38px;font-size:18px;cursor:pointer;color:var(--body)}
.content{padding:24px;max-width:1200px;width:100%}

.branch-pill{
  display:flex;align-items:center;gap:8px;font-size:13px;color:var(--body);
  background:var(--neu-b);padding:7px 12px;border-radius:999px;
}
.branch-pill select{border:none;background:transparent;font-family:inherit;font-size:13px;color:var(--title);font-weight:500;outline:none;cursor:pointer}
.user-chip{display:flex;align-items:center;gap:10px}
.avatar{width:34px;height:34px;border-radius:50%;background:var(--info-b);color:var(--primary);display:flex;align-items:center;justify-content:center;font-weight:700}

/* ---------- Cards ---------- */
.card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius-card);box-shadow:var(--shadow);padding:22px}
.card + .card{margin-top:18px}
.card-title{font-size:16px;font-weight:600;margin-bottom:4px}
.card-sub{font-size:12px;color:var(--muted);margin-bottom:16px}
.grid{display:grid;gap:18px}
.grid.cols-2{grid-template-columns:repeat(2,1fr)}
.grid.cols-3{grid-template-columns:repeat(3,1fr)}
.grid.cols-4{grid-template-columns:repeat(4,1fr)}
.row{display:flex;gap:12px;flex-wrap:wrap;align-items:center}
.between{justify-content:space-between}

/* Stat cards */
.stat{background:var(--card);border:1px solid var(--border);border-radius:var(--radius-card);padding:20px;box-shadow:var(--shadow)}
.stat .label{font-size:11px;color:var(--muted);text-transform:uppercase;letter-spacing:1px}
.stat .value{font-size:24px;font-weight:700;color:var(--title);margin-top:8px}
.stat .value.mono{font-size:22px}
.stat .delta{font-size:12px;margin-top:6px;color:var(--muted)}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  border:1px solid var(--border);background:var(--card);color:var(--body);
  padding:9px 16px;border-radius:var(--radius);font-size:14px;font-weight:500;cursor:pointer;
  transition:background .15s,border-color .15s,box-shadow .15s;
}
.btn:hover{background:var(--neu-b)}
.btn:focus-visible{outline:2px solid var(--primary);outline-offset:2px}
.btn-primary{background:var(--primary);border-color:var(--primary);color:#fff}
.btn-primary:hover{background:var(--primary-hover);border-color:var(--primary-hover)}
.btn-danger{background:var(--card);border-color:var(--danger);color:var(--danger)}
.btn-danger:hover{background:var(--danger-b)}
.btn-sm{padding:6px 11px;font-size:13px}
.btn-block{width:100%}
.btn:disabled{opacity:.5;cursor:not-allowed}

/* ---------- Forms ---------- */
label.field{display:block;margin-bottom:14px}
label.field .lbl{display:block;font-size:12px;font-weight:500;color:var(--body);margin-bottom:6px}
input,select,textarea{
  width:100%;padding:10px 12px;border:1px solid var(--border);border-radius:var(--radius);
  font-family:inherit;font-size:14px;color:var(--title);background:var(--card);transition:border-color .15s,box-shadow .15s;
}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px rgba(37,99,235,.12)}
textarea{resize:vertical;min-height:70px}

/* ---------- Tables ---------- */
.table-wrap{overflow-x:auto;border:1px solid var(--border);border-radius:var(--radius-card);background:var(--card)}
table{width:100%;border-collapse:collapse;font-size:14px}
thead th{
  text-align:left;padding:12px 16px;font-size:11px;color:var(--muted);text-transform:uppercase;
  letter-spacing:.6px;font-weight:600;border-bottom:1px solid var(--border);white-space:nowrap;
}
tbody td{padding:12px 16px;border-bottom:1px solid var(--border);color:var(--body);vertical-align:middle}
tbody tr:last-child td{border-bottom:none}
tbody tr:hover{background:var(--neu-b)}
td.num,th.num{text-align:right}
.empty{padding:40px;text-align:center;color:var(--muted)}

/* ---------- Badges ---------- */
.badge{display:inline-flex;align-items:center;gap:5px;padding:3px 10px;border-radius:999px;font-size:12px;font-weight:600}
.badge.ok{background:var(--ok-b);color:var(--ok-t)}
.badge.warn{background:var(--warn-b);color:var(--warn-t)}
.badge.info{background:var(--info-b);color:var(--info-t)}
.badge.neu{background:var(--neu-b);color:var(--neu-t)}
.badge.danger{background:var(--danger-b);color:var(--danger)}

/* ---------- Skeleton ---------- */
.skeleton{background:linear-gradient(90deg,#eef2f7 25%,#e2e8f0 37%,#eef2f7 63%);background-size:400% 100%;animation:sk 1.4s ease infinite;border-radius:8px}
@keyframes sk{0%{background-position:100% 50%}100%{background-position:0 50%}}
.sk-line{height:14px;margin-bottom:10px}
.sk-card{height:90px}

/* ---------- Login ---------- */
.login-wrap{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:20px;background:var(--bg)}
.login-card{width:100%;max-width:390px;background:var(--card);border:1px solid var(--border);border-radius:var(--radius-card);box-shadow:var(--shadow);padding:34px}
.login-card .logo{text-align:center;margin-bottom:24px}
.login-card .logo h1{font-size:24px;letter-spacing:1px}
.login-card .logo .sub{font-size:11px;color:var(--muted);text-transform:uppercase;letter-spacing:2px;margin-top:4px}
.login-hint{margin-top:16px;font-size:12px;color:var(--muted);text-align:center;background:var(--neu-b);padding:10px;border-radius:var(--radius)}

/* ---------- Modal ---------- */
.modal-bg{position:fixed;inset:0;background:rgba(15,23,42,.35);display:flex;align-items:center;justify-content:center;z-index:60;padding:20px;animation:fade .15s ease}
.modal{background:var(--card);border-radius:var(--radius-card);box-shadow:0 20px 50px rgba(15,23,42,.18);width:100%;max-width:520px;max-height:90vh;overflow-y:auto;animation:pop .18s ease}
.modal.lg{max-width:820px}
.modal-head{padding:20px 24px;border-bottom:1px solid var(--border);display:flex;justify-content:space-between;align-items:center}
.modal-head h3{font-size:17px}
.modal-body{padding:24px}
.modal-foot{padding:16px 24px;border-top:1px solid var(--border);display:flex;justify-content:flex-end;gap:10px}
.x-close{background:none;border:none;font-size:22px;color:var(--muted);cursor:pointer;line-height:1}
@keyframes fade{from{opacity:0}to{opacity:1}}
@keyframes pop{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}
.view-enter{animation:fade .18s ease}

/* ---------- Toast ---------- */
.toasts{position:fixed;top:18px;right:18px;z-index:80;display:flex;flex-direction:column;gap:10px}
.toast{background:var(--card);border:1px solid var(--border);border-left:4px solid var(--primary);border-radius:var(--radius);box-shadow:var(--shadow);padding:12px 16px;min-width:240px;animation:pop .18s ease;font-size:14px}
.toast.ok{border-left-color:var(--ok-t)}
.toast.err{border-left-color:var(--danger)}

/* ---------- POS ---------- */
.pos-grid{display:grid;grid-template-columns:1fr 380px;gap:18px;align-items:start}
.catalog-tabs{display:flex;gap:8px;margin-bottom:16px;flex-wrap:wrap}
.chip{padding:7px 14px;border-radius:999px;border:1px solid var(--border);background:var(--card);cursor:pointer;font-size:13px;font-weight:500;color:var(--body)}
.chip.active{background:var(--primary);border-color:var(--primary);color:#fff}
.item-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:12px}
.item-btn{border:1px solid var(--border);border-radius:var(--radius);padding:14px;background:var(--card);cursor:pointer;text-align:left;transition:border-color .15s,box-shadow .15s}
.item-btn:hover{border-color:var(--primary);box-shadow:var(--shadow)}
.item-btn .nm{font-weight:600;color:var(--title);font-size:14px}
.item-btn .pr{color:var(--primary);font-weight:700;margin-top:6px}
.item-btn .cat{font-size:11px;color:var(--muted);text-transform:uppercase;letter-spacing:.5px}
.cart-item{border-bottom:1px solid var(--border);padding:12px 0}
.cart-item:last-child{border-bottom:none}
.cart-item .top{display:flex;justify-content:space-between;gap:8px}
.cart-item .nm{font-weight:600;color:var(--title)}
.cart-line{display:flex;align-items:center;gap:8px;margin-top:8px}
.cart-line select{font-size:12px;padding:6px 8px}
.qty{display:flex;align-items:center;gap:4px}
.qty button{width:26px;height:26px;border:1px solid var(--border);border-radius:6px;background:var(--card);cursor:pointer;font-weight:700;color:var(--body)}
.total-line{display:flex;justify-content:space-between;padding:6px 0;font-size:14px}
.total-line.grand{font-size:20px;font-weight:700;color:var(--title);border-top:1px solid var(--border);margin-top:8px;padding-top:12px}

/* ---------- Misc ---------- */
.page-actions{display:flex;gap:10px;margin-bottom:18px;flex-wrap:wrap;align-items:center}
.section-title{font-size:12px;color:var(--muted);text-transform:uppercase;letter-spacing:1px;margin:24px 0 12px}
.help{font-size:12px;color:var(--muted);margin-top:4px}
.kv{display:flex;justify-content:space-between;padding:8px 0;border-bottom:1px solid var(--border)}
.kv:last-child{border-bottom:none}
.kv .k{color:var(--muted)}
.kv .v{font-weight:600;color:var(--title)}
.danger-zone{border-color:var(--danger-b)}

/* ---------- Responsive ---------- */
.backdrop{display:none}
@media(max-width:900px){
  .sidebar{transform:translateX(-100%)}
  .sidebar.open{transform:translateX(0);box-shadow:0 10px 40px rgba(15,23,42,.2)}
  .main{margin-left:0}
  .hamburger{display:inline-flex;align-items:center;justify-content:center}
  .backdrop.show{display:block;position:fixed;inset:0;background:rgba(15,23,42,.35);z-index:35}
  .pos-grid{grid-template-columns:1fr}
  .grid.cols-4{grid-template-columns:repeat(2,1fr)}
  .grid.cols-3{grid-template-columns:1fr}
  .grid.cols-2{grid-template-columns:1fr}
  .content{padding:16px}
}
@media(max-width:560px){
  .grid.cols-4{grid-template-columns:1fr}
  .topbar .page-title{font-size:17px}
}