:root {
  --blue: #2b6cb0;
  --blue-light: #ebf4ff;
  --green: #2f855a;
  --green-light: #e6fffa;
  --bg: #f7fafc;
  --text: #1a202c;
  --border: #e2e8f0;
  --danger: #c53030;
}
* { box-sizing: border-box; }
body {
  margin: 0; font-family: "Segoe UI", Tahoma, Arial, sans-serif;
  background: var(--bg); color: var(--text); font-size: 15px;
}
a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }

.app-shell { display: flex; min-height: 100vh; }
.sidebar {
  width: 220px; background: #fff; border-right: 1px solid var(--border);
  display: flex; flex-direction: column; padding: 16px; flex-shrink: 0;
}
.brand { font-weight: 700; font-size: 18px; color: var(--blue); margin-bottom: 24px; }
.sidebar nav { display: flex; flex-direction: column; gap: 4px; flex: 1; }
.sidebar nav a { padding: 10px 12px; border-radius: 6px; color: var(--text); }
.sidebar nav a:hover { background: var(--blue-light); text-decoration: none; }
.sidebar-footer { border-top: 1px solid var(--border); padding-top: 12px; margin-top: 12px; }
.user-chip { font-size: 13px; margin-bottom: 8px; }
.logout-link { color: var(--danger); font-size: 13px; }

.content { flex: 1; padding: 24px; max-width: 1200px; }

h1 { font-size: 22px; margin-top: 0; }
h2 { font-size: 18px; }

.alert { padding: 10px 14px; border-radius: 6px; margin-bottom: 16px; }
.alert-success { background: var(--green-light); color: var(--green); border: 1px solid #b2f5ea; }
.alert-error { background: #fff5f5; color: var(--danger); border: 1px solid #feb2b2; }

.card { background: #fff; border: 1px solid var(--border); border-radius: 8px; padding: 16px; margin-bottom: 16px; }
.card-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 16px; margin-bottom: 24px; }
.stat-card { background: #fff; border: 1px solid var(--border); border-left: 4px solid var(--blue); border-radius: 8px; padding: 16px; }
.stat-card .stat-num { font-size: 28px; font-weight: 700; color: var(--blue); }
.stat-card.warn { border-left-color: #dd6b20; }
.stat-card.warn .stat-num { color: #dd6b20; }

table { width: 100%; border-collapse: collapse; background: #fff; }
table th, table td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--border); font-size: 14px; }
table th { background: var(--blue-light); color: var(--blue); font-weight: 600; }
table tr:hover { background: #fafcff; }

.form-row { margin-bottom: 14px; }
.form-row label { display: block; margin-bottom: 4px; font-weight: 600; font-size: 13px; }
.form-row input[type=text], .form-row input[type=email], .form-row input[type=password],
.form-row input[type=date], .form-row input[type=time], .form-row input[type=number],
.form-row select, .form-row textarea {
  width: 100%; padding: 8px 10px; border: 1px solid var(--border); border-radius: 6px; font-size: 14px;
}
.form-row .error { color: var(--danger); font-size: 12px; margin-top: 4px; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0 16px; }

.btn {
  display: inline-block; padding: 8px 16px; border-radius: 6px; border: none;
  background: var(--blue); color: #fff; cursor: pointer; font-size: 14px;
}
.btn:hover { background: #2c5282; text-decoration: none; }
.btn-secondary { background: #edf2f7; color: var(--text); }
.btn-secondary:hover { background: #e2e8f0; }
.btn-danger { background: var(--danger); }
.btn-success { background: var(--green); }
.btn-sm { padding: 4px 10px; font-size: 12px; }

.badge { display: inline-block; padding: 2px 8px; border-radius: 10px; font-size: 12px; }
.badge-blue { background: var(--blue-light); color: var(--blue); }
.badge-green { background: var(--green-light); color: var(--green); }
.badge-orange { background: #fffaf0; color: #dd6b20; }
.badge-red { background: #fff5f5; color: var(--danger); }
.badge-gray { background: #edf2f7; color: #4a5568; }

.tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--border); margin-bottom: 16px; }
.tabs a { padding: 8px 14px; border-radius: 6px 6px 0 0; color: var(--text); }
.tabs a.active { background: var(--blue-light); color: var(--blue); font-weight: 600; }

.toolbar { display: flex; gap: 10px; align-items: center; margin-bottom: 16px; flex-wrap: wrap; }
.empty-state { text-align: center; padding: 40px; color: #718096; }

.private-note-box { background: #fffbea; border: 1px dashed #d69e2e; padding: 12px; border-radius: 6px; }
.pagination { display: flex; gap: 6px; margin-top: 16px; }
.pagination a, .pagination span { padding: 6px 10px; border: 1px solid var(--border); border-radius: 4px; }
.pagination .active { background: var(--blue); color: #fff; }

.login-wrapper { display: flex; align-items: center; justify-content: center; min-height: 100vh; }
.login-box { background: #fff; padding: 32px; border-radius: 10px; border: 1px solid var(--border); width: 340px; }
.login-box h1 { color: var(--blue); text-align: center; }

@media (max-width: 800px) {
  .app-shell { flex-direction: column; }
  .sidebar { width: 100%; }
  .form-grid { grid-template-columns: 1fr; }
}