:root {
  --bg: #f6f7f9; --surface: #ffffff; --border: #e5e7eb; --text: #111827; --text-muted: #6b7280;
  --primary: #2563eb; --primary-dark: #1d4ed8; --primary-light: #eff6ff;
  --success: #059669; --success-bg: #ecfdf5; --warning: #d97706; --warning-bg: #fffbeb;
  --danger: #dc2626; --danger-bg: #fef2f2; --sidebar-bg: #111827; --sidebar-text: #cbd5e1;
  --sidebar-active: #1f2937; --radius: 8px; --shadow: 0 1px 2px rgba(0,0,0,.05), 0 1px 3px rgba(0,0,0,.06);
}
* { box-sizing: border-box; }
body { margin:0; font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif; background:var(--bg); color:var(--text); font-size:14px; }
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

.app-shell { display:flex; min-height:100vh; }
.sidebar { width:230px; flex-shrink:0; background:var(--sidebar-bg); color:var(--sidebar-text); display:flex; flex-direction:column; position:fixed; top:0; bottom:0; left:0; z-index:20; }
.sidebar .brand { padding:20px 20px 16px; font-size:17px; font-weight:700; color:#fff; border-bottom:1px solid rgba(255,255,255,.08); }
.sidebar nav { flex:1; overflow-y:auto; padding:12px 8px; }
.sidebar a.nav-link { display:flex; align-items:center; gap:10px; padding:10px 12px; border-radius:6px; color:var(--sidebar-text); font-size:13.5px; margin-bottom:2px; }
.sidebar a.nav-link:hover { background:rgba(255,255,255,.06); text-decoration:none; }
.sidebar a.nav-link.active { background:var(--sidebar-active); color:#fff; font-weight:600; }
.sidebar .sidebar-footer { padding:14px 16px; border-top:1px solid rgba(255,255,255,.08); font-size:12.5px; }
.main { margin-left:230px; flex:1; min-width:0; display:flex; flex-direction:column; }
.topbar { background:var(--surface); border-bottom:1px solid var(--border); padding:14px 28px; display:flex; align-items:center; justify-content:space-between; position:sticky; top:0; z-index:10; }
.topbar h1 { font-size:18px; margin:0; }
.content { padding:24px 28px; flex:1; }

.card { background:var(--surface); border:1px solid var(--border); border-radius:var(--radius); box-shadow:var(--shadow); padding:20px; }
.grid { display:grid; gap:16px; }
.grid-4 { grid-template-columns:repeat(4,1fr); }
.grid-3 { grid-template-columns:repeat(3,1fr); }
.grid-2 { grid-template-columns:repeat(2,1fr); }
.stat-card { display:flex; flex-direction:column; gap:6px; }
.stat-label { font-size:12.5px; color:var(--text-muted); text-transform:uppercase; letter-spacing:.04em; }
.stat-value { font-size:26px; font-weight:700; }

.btn { display:inline-flex; align-items:center; gap:6px; padding:8px 16px; border-radius:6px; border:1px solid var(--border); background:var(--surface); color:var(--text); font-size:13.5px; font-weight:500; cursor:pointer; text-decoration:none; }
.btn:hover { background:#f3f4f6; text-decoration:none; }
.btn-primary { background:var(--primary); border-color:var(--primary); color:#fff; }
.btn-primary:hover { background:var(--primary-dark); }
.btn-danger { background:var(--danger); border-color:var(--danger); color:#fff; }
.btn-danger:hover { background:#b91c1c; }
.btn-sm { padding:5px 10px; font-size:12.5px; }

label { display:block; font-size:13px; font-weight:600; margin-bottom:5px; }
input, select, textarea { width:100%; padding:9px 11px; border:1px solid var(--border); border-radius:6px; font-size:13.5px; font-family:inherit; background:#fff; color:var(--text); }
input:focus, select:focus, textarea:focus { outline:none; border-color:var(--primary); box-shadow:0 0 0 3px var(--primary-light); }
.form-group { margin-bottom:16px; }
.form-row { display:flex; gap:16px; }
.form-row > * { flex:1; }
.hint { font-size:12px; color:var(--text-muted); margin-top:4px; }

table { width:100%; border-collapse:collapse; }
th, td { text-align:left; padding:10px 12px; border-bottom:1px solid var(--border); font-size:13.5px; }
th { color:var(--text-muted); font-weight:600; font-size:12px; text-transform:uppercase; }
tbody tr:hover { background:#fafafa; }

.badge { display:inline-block; padding:3px 9px; border-radius:999px; font-size:11.5px; font-weight:600; }
.badge-gray { background:#f3f4f6; color:#374151; }
.badge-green { background:var(--success-bg); color:var(--success); }
.badge-yellow { background:var(--warning-bg); color:var(--warning); }
.badge-red { background:var(--danger-bg); color:var(--danger); }
.badge-blue { background:var(--primary-light); color:var(--primary); }

.toolbar { display:flex; align-items:center; justify-content:space-between; margin-bottom:16px; gap:12px; flex-wrap:wrap; }
.toolbar-actions { display:flex; gap:8px; flex-wrap:wrap; }
.tabs { display:flex; gap:4px; border-bottom:1px solid var(--border); margin-bottom:18px; }
.tab { padding:9px 14px; font-size:13.5px; cursor:pointer; border-bottom:2px solid transparent; color:var(--text-muted); text-decoration:none; }
.tab.active { color:var(--primary); border-color:var(--primary); font-weight:600; }
.empty-state { text-align:center; padding:48px 20px; color:var(--text-muted); }
.chip { background:#f3f4f6; border-radius:6px; padding:6px 10px; font-size:12.5px; display:inline-flex; align-items:center; gap:8px; margin:0 6px 6px 0; }
.text-muted { color:var(--text-muted); }
.mt-0 { margin-top:0; }

.flash { padding:12px 16px; border-radius:6px; margin-bottom:16px; font-size:13.5px; }
.flash-success { background:var(--success-bg); color:var(--success); }
.flash-error { background:var(--danger-bg); color:var(--danger); }
.flash-info { background:var(--primary-light); color:var(--primary); }

.login-wrap { min-height:100vh; display:flex; align-items:center; justify-content:center; }
.login-card { width:380px; background:#fff; border:1px solid var(--border); border-radius:var(--radius); box-shadow:var(--shadow); padding:32px; }

.progress-bar { height:8px; border-radius:4px; background:#e5e7eb; overflow:hidden; }
.progress-bar-fill { height:100%; background:var(--primary); }

@media (max-width:900px) { .grid-4{grid-template-columns:repeat(2,1fr);} .grid-3{grid-template-columns:repeat(2,1fr);} .form-row{flex-direction:column;} }
@media (max-width:720px) { .sidebar{display:none;} .main{margin-left:0;} .grid-4,.grid-3,.grid-2{grid-template-columns:1fr;} }