:root {
  --bg: #f4f6f8; --surface: #ffffff; --border: #e2e5e9; --text: #1a1f27;
  --text-muted: #6b7280; --primary: #1e5f8c; --primary-dark: #164a6e;
  --success: #1a7f4b; --danger: #c0392b; --warning: #b8860b; --radius: 8px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); }
a { color: var(--primary); text-decoration: none; }
.app-shell { display: flex; min-height: 100vh; }
.sidebar { width: 220px; background: var(--primary-dark); color: #fff; padding: 20px 0; flex-shrink: 0; }
.sidebar h1 { font-size: 18px; padding: 0 20px 20px; margin: 0; border-bottom: 1px solid rgba(255,255,255,0.15); }
.sidebar nav { display: flex; flex-direction: column; margin-top: 10px; }
.sidebar nav a, .sidebar nav .link-button {
  color: #dbe9f4; padding: 10px 20px; display: block; font-size: 14px;
  background: none; border: none; text-align: left; cursor: pointer; width: 100%; font-family: inherit;
}
.sidebar nav a.active, .sidebar nav a:hover, .sidebar nav .link-button:hover { background: rgba(255,255,255,0.1); color: #fff; }
.sidebar .role-tag { padding: 0 20px; font-size: 12px; color: #9fb9cc; margin-top: 4px; }
.main { flex: 1; padding: 24px; max-width: 1200px; }
.page-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 20px; }
.page-header h2 { margin: 0; font-size: 22px; }
.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px; margin-bottom: 16px; }
.card-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 14px; margin-bottom: 20px; }
.stat-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px; }
.stat-card .label { color: var(--text-muted); font-size: 13px; }
.stat-card .value { font-size: 24px; font-weight: 600; margin-top: 4px; }
table { width: 100%; border-collapse: collapse; background: var(--surface); }
th, td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--border); font-size: 14px; }
th { color: var(--text-muted); font-weight: 600; font-size: 12px; text-transform: uppercase; }
tr:hover td { background: #fafbfc; }
.btn { display: inline-block; padding: 8px 16px; border-radius: 6px; border: none; background: var(--primary); color: #fff; cursor: pointer; font-size: 14px; font-weight: 500; font-family: inherit; }
.btn:hover { background: var(--primary-dark); }
.btn.secondary { background: var(--surface); color: var(--text); border: 1px solid var(--border); }
.btn.danger { background: var(--danger); }
.btn.small { padding: 4px 10px; font-size: 12px; }
.form-row { display: flex; flex-direction: column; gap: 4px; margin-bottom: 12px; }
.form-row label { font-size: 13px; color: var(--text-muted); }
.form-row input, .form-row select, .form-row textarea { padding: 8px 10px; border: 1px solid var(--border); border-radius: 6px; font-size: 14px; font-family: inherit; }
.form-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px,1fr)); gap: 0 16px; }
.badge { padding: 2px 8px; border-radius: 10px; font-size: 11px; font-weight: 600; }
.badge.paid { background: #e3f5ea; color: var(--success); }
.badge.partial { background: #fdf3d9; color: var(--warning); }
.badge.unpaid { background: #fbe6e3; color: var(--danger); }
.badge.low { background: #fbe6e3; color: var(--danger); }
.login-screen { display: flex; align-items: center; justify-content: center; min-height: 100vh; background: var(--primary-dark); }
.login-box { background: #fff; padding: 32px; border-radius: 12px; width: 320px; }
.login-box h1 { margin-top: 0; font-size: 20px; text-align: center; }
.error-text { color: var(--danger); font-size: 13px; margin: 8px 0; }
.muted { color: var(--text-muted); font-size: 13px; }
.search-bar { display: flex; gap: 10px; margin-bottom: 16px; }
.search-bar input { flex: 1; padding: 8px 12px; border: 1px solid var(--border); border-radius: 6px; }
.totals-box { text-align: right; margin-top: 12px; font-size: 14px; }
.totals-box .grand { font-size: 18px; font-weight: 700; }
.tier-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 10px; }
.tier-grid .tier-box { border: 1px solid var(--border); border-radius: 6px; padding: 10px; }
.tier-grid .tier-box h4 { margin: 0 0 8px; }

@media print {
  .sidebar, .no-print { display: none !important; }
  .app-shell { display: block; }
  .main { padding: 0; max-width: 100%; }
  body { background: #fff; }
  .card { border: none; box-shadow: none; padding: 0; }
}