:root {
  /* Brand */
  --brand-primary: #6366f1;
  --brand-primary-hover: #4f46e5;
  --brand-primary-light: #eef2ff;

  /* Neutrals */
  --color-bg: #f8fafc;
  --color-surface: #ffffff;
  --color-surface-raised: #f1f5f9;
  --color-border: #e2e8f0;
  --color-border-strong: #cbd5e1;

  /* Text */
  --color-text: #0f172a;
  --color-text-secondary: #475569;
  --color-text-muted: #94a3b8;

  /* Status */
  --color-success: #10b981;
  --color-success-light: #d1fae5;
  --color-warning: #f59e0b;
  --color-warning-light: #fef3c7;
  --color-danger: #ef4444;
  --color-danger-light: #fee2e2;
  --color-info: #3b82f6;
  --color-info-light: #dbeafe;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(15,23,42,0.06);
  --shadow-md: 0 4px 12px rgba(15,23,42,0.08);
  --shadow-lg: 0 8px 24px rgba(15,23,42,0.12);

  /* Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 20px;

  /* Transitions */
  --transition: 150ms ease;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 14px;
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* ── Cards ──────────────────────────────────────────────────────────────── */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
  box-shadow: var(--shadow-sm);
}
.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}
.card-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
}
.card-subtitle {
  font-size: 12px;
  color: var(--color-text-muted);
  margin-top: 2px;
}

/* ── Metric cards ───────────────────────────────────────────────────────── */
.metric-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition);
}
.metric-card:hover { box-shadow: var(--shadow-md); }
.metric-label {
  font-size: 12px;
  font-weight: 500;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 8px;
}
.metric-value {
  font-size: 28px;
  font-weight: 700;
  color: var(--color-text);
  line-height: 1;
}
.metric-change {
  font-size: 12px;
  font-weight: 500;
  margin-top: 6px;
}
.metric-change.up { color: var(--color-success); }
.metric-change.down { color: var(--color-danger); }
.metric-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  margin-bottom: 12px;
}

/* ── Tables ─────────────────────────────────────────────────────────────── */
.table-wrapper {
  overflow-x: auto;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
}
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}
.data-table th {
  background: var(--color-surface-raised);
  padding: 10px 16px;
  text-align: left;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-muted);
  border-bottom: 1px solid var(--color-border);
  white-space: nowrap;
}
.data-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text-secondary);
  vertical-align: middle;
}
.data-table tr:last-child td { border-bottom: none; }
.data-table tbody tr:hover { background: var(--color-surface-raised); }
.data-table .text-primary { color: var(--color-text); font-weight: 500; }

/* ── Badges ─────────────────────────────────────────────────────────────── */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 600;
  white-space: nowrap;
}
.badge-success { background: var(--color-success-light); color: #065f46; }
.badge-warning { background: var(--color-warning-light); color: #92400e; }
.badge-danger  { background: var(--color-danger-light);  color: #991b1b; }
.badge-info    { background: var(--color-info-light);    color: #1e40af; }
.badge-neutral { background: var(--color-surface-raised); color: var(--color-text-muted); }

/* ── Buttons ────────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  border: none;
  transition: all var(--transition);
  text-decoration: none;
  white-space: nowrap;
  font-family: inherit;
}
.btn-primary {
  background: var(--brand-primary);
  color: white;
}
.btn-primary:hover { background: var(--brand-primary-hover); }
.btn-secondary {
  background: var(--color-surface);
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
}
.btn-secondary:hover { background: var(--color-surface-raised); }
.btn-danger { background: var(--color-danger); color: white; }
.btn-sm { padding: 5px 12px; font-size: 12px; }
.btn-icon { padding: 8px; }

/* ── Forms ──────────────────────────────────────────────────────────────── */
.form-group { margin-bottom: 16px; }
.form-label {
  display: block;
  font-size: 13px;
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: 6px;
}
.form-input, .form-select, .form-textarea {
  width: 100%;
  padding: 8px 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-family: inherit;
  color: var(--color-text);
  background: var(--color-surface);
  transition: border-color var(--transition);
  outline: none;
}
.form-input:focus, .form-select:focus, .form-textarea:focus {
  border-color: var(--brand-primary);
  box-shadow: 0 0 0 3px var(--brand-primary-light);
}

/* ── Page layout ────────────────────────────────────────────────────────── */
.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
}
.page-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-text);
}
.page-subtitle {
  font-size: 13px;
  color: var(--color-text-muted);
  margin-top: 2px;
}
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .grid-4, .grid-3, .grid-2 { grid-template-columns: 1fr; }
}
.stack { display: flex; flex-direction: column; gap: 16px; }

/* ── Empty state ────────────────────────────────────────────────────────── */
.empty-state {
  text-align: center;
  padding: 48px 24px;
  color: var(--color-text-muted);
}
.empty-state-icon { font-size: 36px; margin-bottom: 12px; }
.empty-state-title { font-size: 15px; font-weight: 600; color: var(--color-text-secondary); margin-bottom: 6px; }
.empty-state-desc { font-size: 13px; }

/* ── Pagination ─────────────────────────────────────────────────────────── */
.pagination {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 0;
  font-size: 13px;
  color: var(--color-text-muted);
}
.pagination-controls { display: flex; gap: 4px; align-items: center; }
.page-btn {
  padding: 5px 10px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  font-size: 12px;
  cursor: pointer;
  color: var(--color-text-secondary);
  transition: all var(--transition);
  font-family: inherit;
}
.page-btn:hover:not(:disabled) { background: var(--color-surface-raised); }
.page-btn.active { background: var(--brand-primary); color: white; border-color: var(--brand-primary); }
.page-btn:disabled { opacity: 0.4; cursor: not-allowed; }

/* ── Sidebar section labels ─────────────────────────────────────────────── */
.sidebar-section-label {
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: rgba(255,255,255,0.35);
  padding: 16px 16px 6px;
}

/* ── Toast ──────────────────────────────────────────────────────────────── */
.toast-container { position: fixed; top: 16px; right: 16px; z-index: 1000; display: flex; flex-direction: column; gap: 8px; }
.toast {
  background: var(--color-text);
  color: white;
  padding: 12px 16px;
  border-radius: var(--radius-md);
  font-size: 13px;
  box-shadow: var(--shadow-lg);
  animation: slideIn 200ms ease;
  max-width: 320px;
}
@keyframes slideIn { from { transform: translateX(100%); opacity: 0; } to { transform: translateX(0); opacity: 1; } }

/* ── Legacy class compatibility ─────────────────────────────────────────────
   Maps old .ui-* classes to the new design system variables.
   Remove once all pages are migrated to the new class names.
────────────────────────────────────────────────────────────────────────── */
.ui-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
  box-shadow: var(--shadow-sm);
}
.ui-card__title {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
  margin: 0 0 12px;
}

.ui-input {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 14px;
}
.ui-input__field {
  padding: 8px 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-family: inherit;
  color: var(--color-text);
  background: var(--color-surface);
  transition: border-color var(--transition);
  outline: none;
}
.ui-input__field:focus {
  border-color: var(--brand-primary);
  box-shadow: 0 0 0 3px var(--brand-primary-light);
}
.ui-field-error {
  color: var(--color-danger);
  font-size: 12px;
  min-height: 14px;
}

.ui-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}
.ui-table th {
  background: var(--color-surface-raised);
  padding: 10px 16px;
  text-align: left;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-muted);
  border-bottom: 1px solid var(--color-border);
}
.ui-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text-secondary);
  vertical-align: middle;
}

.ui-badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 600;
  background: var(--color-surface-raised);
  color: var(--color-text-muted);
}
.ui-badge--success { background: var(--color-success-light); color: #065f46; }
.ui-badge--info    { background: var(--color-info-light);    color: #1e40af; }
.ui-badge--warning { background: var(--color-warning-light); color: #92400e; }
.ui-badge--danger  { background: var(--color-danger-light);  color: #991b1b; }
.ui-badge--neutral { background: var(--color-surface-raised); color: var(--color-text-muted); }

.ui-toast-container {
  position: fixed;
  right: 16px;
  top: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  z-index: 1000;
}
.ui-toast {
  background: var(--color-text);
  color: white;
  padding: 12px 16px;
  border-radius: var(--radius-md);
  font-size: 13px;
  box-shadow: var(--shadow-lg);
  max-width: 320px;
}
.ui-toast--success { background: var(--color-success); }
.ui-toast--warning { background: var(--color-warning); }
.ui-toast--danger  { background: var(--color-danger); }