:root{
  --bg:#0f172a;
  --sidebar:#111827;
  --sidebar-hover:#1e293b;
  --card:#ffffff;
  --primary:#2563eb;
  --primary-dark:#1d4ed8;
  --accent:#06b6d4;
  --green:#16a34a;
  --amber:#f59e0b;
  --red:#dc2626;
  --text:#0f172a;
  --muted:#64748b;
  --border:#e2e8f0;
  --shadow:0 1px 3px rgba(0,0,0,.08),0 1px 2px rgba(0,0,0,.04);
}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:'Segoe UI',Tahoma,system-ui,sans-serif;background:#f1f5f9;color:var(--text);font-size:14px}
a{text-decoration:none;color:inherit}

/* ---------- Login ---------- */
.login-wrap{min-height:100vh;display:flex;align-items:center;justify-content:center;
  background:linear-gradient(135deg,#0f172a 0%,#1e3a8a 50%,#06b6d4 100%)}
.login-box{background:#fff;padding:40px;border-radius:16px;width:360px;box-shadow:0 20px 50px rgba(0,0,0,.3)}
.login-box h1{font-size:22px;text-align:center;margin-bottom:4px;color:var(--primary-dark)}
.login-box p{text-align:center;color:var(--muted);margin-bottom:24px;font-size:13px}

/* ---------- Layout ---------- */
.layout{display:flex;min-height:100vh}
.sidebar{width:240px;background:var(--sidebar);color:#cbd5e1;position:fixed;top:0;bottom:0;left:0;
  overflow-y:auto;transition:.2s}
.sidebar .brand{padding:20px;font-size:17px;font-weight:700;color:#fff;
  background:linear-gradient(135deg,var(--primary),var(--accent));display:flex;align-items:center;gap:10px}
.sidebar .brand .logo{width:34px;height:34px;background:rgba(255,255,255,.2);border-radius:8px;
  display:flex;align-items:center;justify-content:center;font-size:18px}
.nav-group{padding:8px 0}
.nav-group .label{padding:12px 20px 6px;font-size:11px;text-transform:uppercase;
  letter-spacing:1px;color:#64748b}
.sidebar a.nav{display:flex;align-items:center;gap:12px;padding:11px 20px;color:#cbd5e1;
  border-left:3px solid transparent;transition:.15s}
.sidebar a.nav:hover{background:var(--sidebar-hover);color:#fff}
.sidebar a.nav.active{background:var(--sidebar-hover);color:#fff;border-left-color:var(--accent)}
.sidebar a.nav .ic{width:20px;text-align:center}

.main{flex:1;margin-left:240px;display:flex;flex-direction:column}
.topbar{background:#fff;height:60px;display:flex;align-items:center;justify-content:space-between;
  padding:0 24px;box-shadow:var(--shadow);position:sticky;top:0;z-index:20}
.topbar h2{font-size:18px}
.topbar .user{display:flex;align-items:center;gap:12px;color:var(--muted);font-size:13px}
.topbar .avatar{width:34px;height:34px;border-radius:50%;background:var(--primary);color:#fff;
  display:flex;align-items:center;justify-content:center;font-weight:700}
.content{padding:24px;flex:1}

.hamburger{display:none;background:none;border:none;font-size:22px;cursor:pointer}

/* ---------- Cards / stats ---------- */
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:16px;margin-bottom:24px}
.stat{background:#fff;border-radius:12px;padding:18px;box-shadow:var(--shadow);
  border-left:4px solid var(--primary);position:relative;overflow:hidden}
.stat.green{border-left-color:var(--green)}
.stat.amber{border-left-color:var(--amber)}
.stat.red{border-left-color:var(--red)}
.stat.cyan{border-left-color:var(--accent)}
.stat .v{font-size:26px;font-weight:700}
.stat .l{color:var(--muted);font-size:13px;margin-top:4px}
.stat .ic{position:absolute;right:14px;top:14px;font-size:30px;opacity:.15}

.card{background:#fff;border-radius:12px;box-shadow:var(--shadow);margin-bottom:20px;overflow:hidden}
.card .card-head{padding:16px 20px;border-bottom:1px solid var(--border);
  display:flex;align-items:center;justify-content:space-between}
.card .card-head h3{font-size:15px}
.card .card-body{padding:20px}

/* ---------- Tables ---------- */
table{width:100%;border-collapse:collapse}
th,td{padding:11px 14px;text-align:left;border-bottom:1px solid var(--border);font-size:13px}
th{background:#f8fafc;color:var(--muted);font-weight:600;text-transform:uppercase;font-size:11px;letter-spacing:.5px}
tbody tr:hover{background:#f8fafc}
.table-wrap{overflow-x:auto}

/* ---------- Forms ---------- */
.form-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:16px}
.field{display:flex;flex-direction:column;gap:6px;margin-bottom:14px}
.field label{font-size:13px;font-weight:600;color:#334155}
input,select,textarea{padding:10px 12px;border:1px solid var(--border);border-radius:8px;
  font-size:14px;font-family:inherit;width:100%;background:#fff}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--primary);
  box-shadow:0 0 0 3px rgba(37,99,235,.12)}

/* ---------- Buttons ---------- */
.btn{display:inline-flex;align-items:center;gap:7px;padding:10px 18px;border:none;border-radius:8px;
  background:var(--primary);color:#fff;font-size:14px;font-weight:600;cursor:pointer;transition:.15s}
.btn:hover{background:var(--primary-dark)}
.btn.green{background:var(--green)}.btn.green:hover{background:#15803d}
.btn.red{background:var(--red)}.btn.red:hover{background:#b91c1c}
.btn.amber{background:var(--amber)}.btn.amber:hover{background:#d97706}
.btn.ghost{background:#f1f5f9;color:var(--text)}.btn.ghost:hover{background:#e2e8f0}
.btn.sm{padding:6px 12px;font-size:12px}

/* ---------- Badges ---------- */
.badge{display:inline-block;padding:3px 10px;border-radius:20px;font-size:11px;font-weight:600}
.badge.in_stock{background:#dcfce7;color:#166534}
.badge.issued{background:#dbeafe;color:#1e40af}
.badge.installed{background:#e0e7ff;color:#3730a3}
.badge.returned{background:#fef3c7;color:#92400e}
.badge.faulty{background:#fee2e2;color:#991b1b}
.badge.low{background:#fee2e2;color:#991b1b}
.badge.ok{background:#dcfce7;color:#166534}

/* ---------- Alerts ---------- */
.alert{padding:12px 16px;border-radius:8px;margin-bottom:16px;font-size:14px}
.alert-success{background:#dcfce7;color:#166534;border:1px solid #bbf7d0}
.alert-error{background:#fee2e2;color:#991b1b;border:1px solid #fecaca}
.alert-warn{background:#fef3c7;color:#92400e;border:1px solid #fde68a}

.page-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:20px;flex-wrap:wrap;gap:12px}
.page-head h1{font-size:22px}
.toolbar{display:flex;gap:10px;flex-wrap:wrap;align-items:center}
.right{text-align:right}
.muted{color:var(--muted)}
.mt{margin-top:16px}
.hidden{display:none}

@media(max-width:900px){
  .sidebar{transform:translateX(-100%);z-index:50}
  .sidebar.open{transform:translateX(0)}
  .main{margin-left:0}
  .hamburger{display:block}
}