/* Inventory UI - Responsive Light Theme */
:root{
  --bg:#f6f8fc;
  --surface:#ffffff;
  --muted:#f4f6fb;
  --text:#111827;
  --text-dim:#6b7280;
  --primary:#2563eb;
  --success:#16a34a;
  --warn:#f59e0b;
  --danger:#dc2626;
  --border:#e5e7eb;
  --accent:#7c3aed;
  --radius:12px;
  --shadow:0 6px 20px rgba(17,24,39,.08);
}
*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font:16px/1.5 system-ui,-apple-system,Segoe UI,Roboto,Inter,Helvetica,Arial,sans-serif;
  color:var(--text);
  background:var(--bg);
}
a{color:var(--primary);text-decoration:none}
a:hover{text-decoration:underline}
.container{max-width:1200px;margin:0 auto;padding:16px}
.header{
  position:sticky;top:0;z-index:20;
  backdrop-filter: blur(8px);
  background:rgba(255,255,255,.9);
  border-bottom:1px solid var(--border);
}
.nav{display:flex;gap:16px;align-items:center;justify-content:space-between;padding:12px 8px}
.brand{display:flex;gap:10px;align-items:center;font-weight:700;color:var(--text)}
.badge{padding:2px 8px;border:1px solid var(--border);border-radius:999px;color:var(--text-dim);background:var(--surface)}
.menu-toggle{
  display:none;border:1px solid var(--border);background:#fff;border-radius:10px;padding:8px 10px;cursor:pointer;
}
.nav-links{display:flex;gap:8px;align-items:center;flex-wrap:wrap}
.nav-links .btn{white-space:nowrap}
@media (max-width: 820px){
  .menu-toggle{display:inline-flex}
  .nav-links{display:none;flex-direction:column;align-items:flex-start;width:100%;margin-top:10px}
  .nav.open .nav-links{display:flex}
  .nav{flex-wrap:wrap}
}
.btn{
  display:inline-flex;gap:8px;align-items:center;justify-content:center;
  padding:10px 14px;border-radius:10px;border:1px solid var(--border);
  background:linear-gradient(180deg,#ffffff,#f7f7fb);
  color:var(--text);cursor:pointer;box-shadow:var(--shadow);
}
.btn:hover{transform:translateY(-1px)}
.btn:active{transform:translateY(0)}
.btn-primary{background:linear-gradient(180deg,#3b82f6,#2563eb);border-color:#1d4ed8;color:white}
.btn-success{background:linear-gradient(180deg,#22c55e,#16a34a);border-color:#15803d;color:white}
.btn-danger{background:linear-gradient(180deg,#ef4444,#dc2626);border-color:#b91c1c;color:white}
.btn-ghost{background:transparent;border-color:var(--border)}
.input, select, textarea{
  width:100%;padding:10px 12px;border-radius:10px;border:1px solid var(--border);
  background:#fff;color:var(--text);outline:none;
}
.input::placeholder{color:var(--text-dim)}
.grid{display:grid;gap:16px}
.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid-4{grid-template-columns:repeat(4,minmax(0,1fr))}
@media (max-width:1024px){.grid-4{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (max-width:900px){.grid-2,.grid-3{grid-template-columns:1fr}}
.card{
  background:var(--surface);
  border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:18px;
}
.card h1,.card h2,.card h3{margin:0 0 8px 0;color:var(--text)}
.toolbar{display:flex;gap:10px;flex-wrap:wrap;align-items:center;justify-content:space-between;margin:12px 0 18px}
.table-responsive{width:100%;overflow-x:auto;-webkit-overflow-scrolling:touch;border-radius:12px;border:1px solid var(--border);background:#fff}
.table{width:100%;border-collapse:separate;border-spacing:0;margin:0}
.table th,.table td{padding:12px 14px;border-bottom:1px solid var(--border);white-space:nowrap}
.table th{background:#f3f4f6;color:#374151;text-align:left;font-weight:600}
.table tr:hover td{background:#fafafa}
.kpi{display:flex;flex-direction:column;gap:4px;padding:14px;border:1px solid var(--border);border-radius:12px;background:#fff}
.kpi .value{font-size:24px;font-weight:800;color:#111827}
.kpi .label{color:var(--text-dim);font-size:12px;text-transform:uppercase;letter-spacing:.08em}
.section-title{display:flex;align-items:center;gap:10px;margin:6px 0 12px}
.form-actions{display:flex;gap:10px;justify-content:flex-end;margin-top:14px}
.badge-pill{font-size:12px;padding:4px 10px;border-radius:999px;border:1px solid var(--border);background:#fff;color:var(--text-dim)}
.footer{padding:24px;color:var(--text-dim);text-align:center}
.alert{padding:12px 14px;border:1px solid var(--border);border-radius:12px;background:#fff;color:var(--text)}
hr{border:none;border-top:1px solid var(--border);margin:16px 0}
/* Forms: stack on small screens */
.form-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
@media (max-width:900px){.form-grid{grid-template-columns:1fr}}
/* Utility: hide on mobile */
.hide-sm{@media (max-width:820px){display:none !important}}