:root{
  --bg:#f5f7f8;--panel:#fff;--text:#111827;--muted:#6b7280;--line:#e5e7eb;
  --dark:#101314;--accent:#168a63;--danger:#b42318;--warn:#a15c00;
}
*{box-sizing:border-box}
body{margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;background:var(--bg);color:var(--text)}
.app{display:flex;min-height:100vh}
.sidebar{width:220px;background:var(--dark);padding:24px 14px;color:#fff;position:fixed;inset:0 auto 0 0}
.brand{font-size:24px;font-weight:800;margin:2px 8px 28px}.brand span{font-weight:500;color:#cbd5e1}
nav{display:grid;gap:6px}
nav a{color:#d1d5db;text-decoration:none;padding:11px 12px;border-radius:9px;font-size:14px}
nav a:hover,nav a.active{background:#1f2928;color:#fff}
.main{margin-left:220px;width:calc(100% - 220px)}
.topbar{height:68px;background:#fff;border-bottom:1px solid var(--line);display:flex;align-items:center;padding:0 28px}
.topbar .muted{margin-left:10px}
.content{padding:28px;max-width:1450px}
h1{font-size:28px;margin:0 0 20px}h2{font-size:18px;margin:0 0 16px}
.muted{color:var(--muted);font-size:13px}
.grid{display:grid;gap:16px}.stats{grid-template-columns:repeat(4,minmax(0,1fr))}
.card{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:18px;box-shadow:0 1px 2px rgba(0,0,0,.02)}
.stat .value{font-size:30px;font-weight:750;margin-top:6px}
.actions{display:flex;gap:10px;flex-wrap:wrap;margin:18px 0}
.btn{display:inline-block;border:0;border-radius:9px;padding:10px 14px;text-decoration:none;cursor:pointer;font-weight:650;background:#111827;color:#fff}
.btn.secondary{background:#eef2f3;color:#111827}.btn.green{background:var(--accent)}.btn.danger{background:var(--danger)}
table{width:100%;border-collapse:collapse;background:#fff;border:1px solid var(--line);border-radius:12px;overflow:hidden}
th,td{text-align:left;padding:12px 14px;border-bottom:1px solid var(--line);font-size:14px;vertical-align:middle}
th{background:#f9fafb;color:#4b5563;font-size:12px;text-transform:uppercase;letter-spacing:.04em}
tr:last-child td{border-bottom:0}
input,select,textarea{width:100%;padding:11px 12px;border:1px solid #d1d5db;border-radius:8px;background:#fff;font:inherit}
label{font-size:13px;font-weight:650;display:block;margin-bottom:6px}
.form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
.form-grid .full{grid-column:1/-1}
.flash{padding:12px 14px;border-radius:9px;margin-bottom:16px;background:#ecfdf3;color:#067647;border:1px solid #abefc6}
.flash.error{background:#fef3f2;color:#b42318;border-color:#fecdca}
.badge{display:inline-block;padding:4px 8px;border-radius:999px;background:#eef2f3;font-size:12px}
.qty-pos{font-weight:700;color:#067647}.qty-neg{font-weight:700;color:#b42318}
.searchbar{display:flex;gap:8px;margin-bottom:16px}.searchbar input{max-width:420px}
.scanbox{max-width:620px}.scanbox input{font-size:22px;padding:16px}.scanbox .btn{font-size:16px;padding:14px 18px}
.hero-actions{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px;margin-top:18px}
.hero-actions a{background:#fff;border:1px solid var(--line);padding:18px;border-radius:12px;text-decoration:none;color:#111827;font-weight:750}
.low{color:#b42318;font-weight:700}
@media(max-width:900px){
 .sidebar{width:76px;padding:20px 8px}.brand{font-size:18px;margin-left:4px}.brand span{display:none}
 nav a{font-size:0;padding:12px 8px}nav a::first-letter{font-size:14px}
 .main{margin-left:76px;width:calc(100% - 76px)}.stats,.hero-actions{grid-template-columns:1fr 1fr}.form-grid{grid-template-columns:1fr}
}
@media(max-width:600px){.content{padding:16px}.stats,.hero-actions{grid-template-columns:1fr}.topbar{padding:0 16px}}