:root{
  --primary:#1e3a8a; --primary-dark:#152a63; --accent:#2563eb;
  --bg:#f4f6fb; --card:#ffffff; --border:#e2e6ee; --text:#1f2937;
  --muted:#6b7280; --success:#15803d; --success-bg:#dcfce7;
  --error:#b91c1c; --error-bg:#fee2e2; --radius:10px;
}
*{box-sizing:border-box}
body{margin:0;font-family:'Segoe UI',Roboto,Arial,sans-serif;background:var(--bg);color:var(--text)}
a{color:var(--accent);text-decoration:none}
.layout{display:flex;min-height:100vh}
.sidebar{width:250px;background:var(--primary-dark);color:#fff;flex-shrink:0;display:flex;flex-direction:column}
.sidebar .brand{padding:20px;font-size:18px;font-weight:700;border-bottom:1px solid rgba(255,255,255,.1)}
.sidebar nav{padding:10px 0;flex:1;overflow-y:auto}
.sidebar nav a{display:block;padding:11px 20px;color:#dbe4ff;font-size:14px;border-left:3px solid transparent}
.sidebar nav a:hover{background:rgba(255,255,255,.06);color:#fff}
.sidebar nav a.active{background:rgba(255,255,255,.1);border-left-color:var(--accent);color:#fff;font-weight:600}
.sidebar .group-title{padding:14px 20px 4px;font-size:11px;text-transform:uppercase;color:#8ea0d6;letter-spacing:.05em}
.main{flex:1;display:flex;flex-direction:column;min-width:0}
.topbar{background:var(--card);border-bottom:1px solid var(--border);padding:14px 24px;display:flex;justify-content:space-between;align-items:center}
.topbar h1{font-size:18px;margin:0}
.topbar .user{font-size:13px;color:var(--muted)}
.content{padding:24px;flex:1}
.card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:20px;margin-bottom:20px}
.card h2{margin-top:0;font-size:16px}
.grid{display:grid;gap:16px}
.grid.cols-4{grid-template-columns:repeat(4,1fr)}
@media(max-width:900px){.grid.cols-4{grid-template-columns:repeat(2,1fr)}}
.stat{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:18px}
.stat .num{font-size:28px;font-weight:700;color:var(--primary)}
.stat .label{font-size:13px;color:var(--muted);margin-top:4px}
table{width:100%;border-collapse:collapse;font-size:14px}
th,td{padding:10px 12px;text-align:left;border-bottom:1px solid var(--border)}
th{background:#f8f9fc;font-weight:600;color:#374151}
tr:hover td{background:#fafbff}
.btn{display:inline-block;padding:8px 16px;border-radius:6px;border:1px solid var(--accent);background:var(--accent);color:#fff;cursor:pointer;font-size:14px}
.btn:hover{background:#1d4ed8}
.btn.secondary{background:#fff;color:var(--accent)}
.btn.danger{background:#fff;color:var(--error);border-color:var(--error)}
.btn.small{padding:4px 10px;font-size:12px}
input,select,textarea{width:100%;padding:8px 10px;border:1px solid var(--border);border-radius:6px;font-size:14px;background:#fff}
label{display:block;font-size:13px;color:#374151;margin-bottom:4px;font-weight:600}
.field{margin-bottom:14px}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.alert{padding:12px 16px;border-radius:8px;margin-bottom:16px;font-size:14px}
.alert.success{background:var(--success-bg);color:var(--success)}
.alert.error{background:var(--error-bg);color:var(--error)}
.badge{display:inline-block;padding:2px 8px;border-radius:12px;font-size:12px}
.badge.active{background:var(--success-bg);color:var(--success)}
.badge.inactive{background:var(--error-bg);color:var(--error)}
.login-wrap{min-height:100vh;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,var(--primary),var(--primary-dark))}
.login-card{background:#fff;padding:36px;border-radius:14px;width:360px;box-shadow:0 20px 40px rgba(0,0,0,.2)}
.login-card h1{font-size:20px;margin-bottom:4px}
.login-card p.sub{color:var(--muted);font-size:13px;margin-top:0;margin-bottom:22px}
.muted{color:var(--muted);font-size:13px}