:root{
  --bg:#f1f5f9; --surface:#ffffff; --surface-2:#f8fafc; --border:#e2e8f0;
  --text:#0f172a; --muted:#64748b; --primary:#2563eb; --primary-d:#1d4ed8;
  --ok:#16a34a; --ok-bg:#dcfce7; --warn:#d97706; --warn-bg:#fef3c7;
  --bad:#dc2626; --bad-bg:#fee2e2; --shadow:0 1px 3px rgba(0,0,0,.08),0 1px 2px rgba(0,0,0,.04);
  --radius:14px; --sidebar:248px;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{font-family:'Inter',system-ui,Segoe UI,Roboto,Helvetica,Arial,sans-serif;background:var(--bg);color:var(--text);font-size:14.5px;line-height:1.5}
a{color:var(--primary);text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3{margin:0 0 .4em}
.muted{color:var(--muted)}
.small{font-size:12.5px}

/* ---------- Layout ---------- */
.app{display:flex;min-height:100vh}
.sidebar{width:var(--sidebar);background:#0f172a;color:#cbd5e1;position:fixed;top:0;bottom:0;left:0;display:flex;flex-direction:column;z-index:40;transition:transform .2s}
.sidebar .brand{padding:20px 18px;font-weight:700;font-size:18px;color:#fff;display:flex;align-items:center;gap:10px;border-bottom:1px solid rgba(255,255,255,.08)}
.sidebar .brand .logo{width:34px;height:34px;border-radius:9px;background:linear-gradient(135deg,#2563eb,#7c3aed);display:flex;align-items:center;justify-content:center;color:#fff;font-weight:800}
.nav{flex:1;overflow-y:auto;padding:10px 10px 24px}
.nav .group{font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:#64748b;margin:16px 12px 6px}
.nav a{display:flex;align-items:center;gap:11px;padding:10px 12px;border-radius:9px;color:#cbd5e1;font-weight:500;margin-bottom:2px}
.nav a:hover{background:rgba(255,255,255,.06);text-decoration:none;color:#fff}
.nav a.active{background:var(--primary);color:#fff}
.nav a svg{width:18px;height:18px;flex:none}
.sidebar .userbox{padding:14px 16px;border-top:1px solid rgba(255,255,255,.08);font-size:13px}
.sidebar .userbox .name{color:#fff;font-weight:600}

.main{flex:1;margin-left:var(--sidebar);display:flex;flex-direction:column;min-width:0}
.topbar{height:62px;background:var(--surface);border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;padding:0 22px;position:sticky;top:0;z-index:30}
.topbar .page-title{font-size:18px;font-weight:700}
.topbar .right{display:flex;align-items:center;gap:14px}
.hamburger{display:none;background:none;border:0;cursor:pointer;font-size:22px;color:var(--text)}
.content{padding:22px;max-width:1280px;width:100%;margin:0 auto}

/* ---------- Cards & grid ---------- */
.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow);margin-bottom:18px}
.card h2{font-size:16px}
.grid{display:grid;gap:16px}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}
@media(max-width:1024px){.grid-4{grid-template-columns:repeat(2,1fr)}.grid-3{grid-template-columns:repeat(2,1fr)}}
@media(max-width:640px){.grid-2,.grid-3,.grid-4{grid-template-columns:1fr}}

/* ---------- Stat cards ---------- */
.stat{display:flex;flex-direction:column;gap:6px}
.stat .label{font-size:12.5px;color:var(--muted);display:flex;align-items:center;gap:8px}
.stat .value{font-size:26px;font-weight:800;letter-spacing:-.02em}
.stat .icon{width:38px;height:38px;border-radius:10px;display:flex;align-items:center;justify-content:center}
.stat.green .icon{background:var(--ok-bg);color:var(--ok)}
.stat.blue .icon{background:#dbeafe;color:var(--primary)}
.stat.red .icon{background:var(--bad-bg);color:var(--bad)}
.stat.amber .icon{background:var(--warn-bg);color:var(--warn)}
.stat .top{display:flex;justify-content:space-between;align-items:flex-start}

/* ---------- Buttons ---------- */
.btn{display:inline-flex;align-items:center;gap:8px;background:var(--primary);color:#fff;border:0;padding:9px 16px;border-radius:9px;font-size:14px;font-weight:600;cursor:pointer;transition:background .15s}
.btn:hover{background:var(--primary-d);text-decoration:none;color:#fff}
.btn.secondary{background:var(--surface-2);color:var(--text);border:1px solid var(--border)}
.btn.secondary:hover{background:#eef2f7}
.btn.danger{background:var(--bad)}
.btn.success{background:var(--ok)}
.btn.sm{padding:6px 11px;font-size:12.5px}
.btn[disabled]{opacity:.55;cursor:not-allowed}
.btn-row{display:flex;gap:10px;flex-wrap:wrap}

/* ---------- Forms ---------- */
label{display:block;font-weight:600;font-size:13px;margin-bottom:5px}
input,select,textarea{width:100%;padding:10px 12px;border:1px solid var(--border);border-radius:9px;font-size:14px;background:var(--surface);color:var(--text);font-family:inherit}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px rgba(37,99,235,.15)}
.field{margin-bottom:14px}
.form-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
@media(max-width:640px){.form-grid{grid-template-columns:1fr}}

/* ---------- Tables ---------- */
.table-wrapper{overflow-x:auto;border-radius:var(--radius);border:1px solid var(--border)}
table{width:100%;border-collapse:collapse;background:var(--surface);font-size:13.5px}
thead th{text-align:left;padding:11px 14px;background:var(--surface-2);color:var(--muted);font-weight:600;font-size:12px;text-transform:uppercase;letter-spacing:.03em;white-space:nowrap;border-bottom:1px solid var(--border)}
tbody td{padding:11px 14px;border-bottom:1px solid var(--border);vertical-align:middle}
tbody tr:last-child td{border-bottom:0}
tbody tr:hover{background:var(--surface-2)}
.text-right{text-align:right}.text-center{text-align:center}
.num{font-variant-numeric:tabular-nums;text-align:right;white-space:nowrap}

/* ---------- Badges ---------- */
.badge{display:inline-block;padding:3px 9px;border-radius:999px;font-size:11.5px;font-weight:700}
.badge-ok{background:var(--ok-bg);color:#15803d}
.badge-warn{background:var(--warn-bg);color:#b45309}
.badge-bad{background:var(--bad-bg);color:#b91c1c}
.badge-muted{background:#e2e8f0;color:#475569}
.pill{display:inline-block;padding:2px 8px;border-radius:6px;background:#eef2f7;color:#475569;font-size:11.5px;font-weight:600}

/* ---------- Flash ---------- */
.flash{padding:12px 16px;border-radius:10px;margin-bottom:14px;font-weight:500;display:flex;gap:10px;align-items:center}
.flash.success{background:var(--ok-bg);color:#166534}
.flash.error{background:var(--bad-bg);color:#991b1b}
.flash.info{background:#dbeafe;color:#1e40af}

/* ---------- Login ---------- */
.login-wrap{min-height:100vh;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#0f172a,#1e3a8a)}
.login-card{background:var(--surface);padding:36px;border-radius:18px;width:92%;max-width:400px;box-shadow:0 30px 80px rgba(0,0,0,.35)}
.login-card .logo-lg{width:58px;height:58px;border-radius:14px;background:linear-gradient(135deg,#2563eb,#7c3aed);display:flex;align-items:center;justify-content:center;color:#fff;font-weight:800;font-size:24px;margin-bottom:16px}

/* ---------- Misc ---------- */
.toolbar{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:16px;flex-wrap:wrap}
.page-head{margin-bottom:18px}
.page-head h1{font-size:22px;margin:0}
.page-head p{margin:4px 0 0;color:var(--muted)}
.empty{text-align:center;padding:40px 20px;color:var(--muted)}
.divider{height:1px;background:var(--border);margin:16px 0}
.tag{font-size:11px;padding:2px 8px;border-radius:6px;background:#dbeafe;color:#1e40af;font-weight:600}

/* ---------- Modal ---------- */
.modal-overlay{position:fixed;inset:0;background:rgba(15,23,42,.55);display:flex;align-items:center;justify-content:center;z-index:60;padding:18px}
.modal{background:var(--surface);border-radius:16px;width:100%;max-width:560px;max-height:90vh;overflow-y:auto;box-shadow:0 30px 80px rgba(0,0,0,.4)}
.modal .modal-head{padding:18px 20px;border-bottom:1px solid var(--border);display:flex;justify-content:space-between;align-items:center}
.modal .modal-body{padding:20px}
.modal .modal-foot{padding:14px 20px;border-top:1px solid var(--border);display:flex;justify-content:flex-end;gap:10px}
.x-btn{background:none;border:0;font-size:22px;cursor:pointer;color:var(--muted);line-height:1}

/* ---------- Responsive sidebar ---------- */
@media(max-width:880px){
  .sidebar{transform:translateX(-100%)}
  .sidebar.open{transform:translateX(0)}
  .main{margin-left:0}
  .hamburger{display:block}
  .scrim{position:fixed;inset:0;background:rgba(0,0,0,.4);z-index:35}
}

/* ---------- Dark mode ---------- */
body.dark{
  --bg:#0b1220;--surface:#111a2e;--surface-2:#0f1830;--border:#1e293b;
  --text:#e2e8f0;--muted:#94a3b8;--shadow:0 1px 3px rgba(0,0,0,.4);
  --ok-bg:#064e3b;--warn-bg:#78350f;--bad-bg:#7f1d1d;
}
body.dark .btn.secondary:hover{background:#1c2840}
body.dark .badge-muted{background:#1e293b;color:#cbd5e1}
body.dark .pill{background:#1e293b;color:#cbd5e1}

/* ---------- Print (receipts) ---------- */
@media print{
  .sidebar,.topbar,.no-print{display:none!important}
  .main{margin-left:0}
  .content{padding:0}
  body{background:#fff}
  .card{box-shadow:none;border:0}
}