:root {
  --bg: #f8fafc;
  --card: #ffffff;
  --card-hover: #f1f5f9;
  --muted: #64748b;
  --text: #1e293b;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --danger-hover: #dc2626;
  --purple: #8b5cf6;
  --border: #e2e8f0;
  --shadow: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
  --radius: 12px;
}

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

body {
  font-family: 'Inter', ui-sans-serif, system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ── Header ── */
header {
  background: rgba(255,255,255,0.9);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  padding: 1rem 1.5rem;
  position: sticky;
  top: 0;
  z-index: 100;
}
.header-container {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}
.brand { display: flex; align-items: center; gap: 0.75rem; }
.brand img { width: 40px; height: 40px; border-radius: 10px; object-fit: cover; border: 1px solid var(--border); }
.brand-text h1 { font-size: 1.5rem; font-weight: 700; }
.brand-text .sub { color: var(--muted); font-size: 0.875rem; }
.header-info { display: flex; align-items: center; gap: 1rem; flex-wrap: wrap; }
.date-display { display: flex; align-items: center; gap: 0.5rem; font-size: 0.875rem; color: var(--muted); }
.status-indicator { width: 8px; height: 8px; border-radius: 50%; background: var(--success); animation: pulse 2s infinite; }
@keyframes pulse { 0%,100%{opacity:1} 50%{opacity:0.5} }
.nav-menu { display: flex; gap: 0.25rem; }
.nav-item {
  display: flex; align-items: center; gap: 0.4rem;
  padding: 0.4rem 0.75rem; border-radius: 8px;
  text-decoration: none; color: var(--muted);
  font-size: 0.875rem; font-weight: 500; transition: all 0.2s;
}
.nav-item:hover, .nav-item.active { background: var(--accent); color: #fff; }
.logout-btn {
  display: flex; align-items: center; gap: 0.5rem;
  padding: 0.5rem 1rem; border-radius: 8px;
  border: 1px solid var(--border); background: white;
  color: var(--muted); font-size: 0.875rem; cursor: pointer;
  transition: all 0.2s;
}
.logout-btn:hover { background: var(--danger); color: white; border-color: var(--danger); }

/* ── Main layout ── */
main {
  flex: 1;
  max-width: 1400px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
  width: 100%;
}

/* ── Page title ── */
.page-title {
  display: flex; align-items: center; gap: 0.75rem;
  margin-bottom: 1.5rem;
}
.page-title .title-icon {
  width: 48px; height: 48px; border-radius: 12px;
  background: linear-gradient(135deg, var(--purple), var(--accent));
  display: flex; align-items: center; justify-content: center;
  color: white; font-size: 1.25rem;
}
.page-title h2 { font-size: 1.75rem; font-weight: 700; }
.page-title p { color: var(--muted); font-size: 0.9rem; }

/* ── Stats bar ── */
.stats-bar {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1rem;
  margin-bottom: 2rem;
}
.stat-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  display: flex; flex-direction: column; gap: 0.25rem;
  box-shadow: var(--shadow);
}
.stat-card .stat-label { font-size: 0.75rem; color: var(--muted); text-transform: uppercase; letter-spacing: 0.05em; }
.stat-card .stat-value { font-size: 2rem; font-weight: 700; line-height: 1; }
.stat-card.accent .stat-value { color: var(--accent); }
.stat-card.success .stat-value { color: var(--success); }
.stat-card.warning .stat-value { color: var(--warning); }
.stat-card.purple .stat-value { color: var(--purple); }
.stat-card.danger .stat-value { color: var(--danger); }

/* ── Tabs ── */
.tabs { display: flex; gap: 0; border-bottom: 2px solid var(--border); margin-bottom: 1.5rem; }
.tab-btn {
  padding: 0.75rem 1.5rem; border: none; background: none;
  color: var(--muted); font-size: 0.9rem; font-weight: 500;
  cursor: pointer; border-bottom: 2px solid transparent;
  margin-bottom: -2px; display: flex; align-items: center; gap: 0.4rem;
  transition: all 0.2s;
}
.tab-btn:hover { color: var(--text); }
.tab-btn.active { color: var(--accent); border-bottom-color: var(--accent); }
.tab-content { display: none; }
.tab-content.active { display: block; }

/* ── Cards ── */
.dashboard-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
  margin-bottom: 1.5rem;
}
.card-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 1.25rem; flex-wrap: wrap; gap: 0.75rem;
}
.card-header h3 { font-size: 1.1rem; font-weight: 600; display: flex; align-items: center; gap: 0.5rem; }

/* ── Form ── */
.form-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 1rem; }
.form-group { display: flex; flex-direction: column; gap: 0.375rem; }
.form-group label { font-size: 0.875rem; font-weight: 500; color: var(--text); }
.form-input, .form-select {
  padding: 0.625rem 0.875rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 0.875rem;
  background: white;
  color: var(--text);
  transition: border-color 0.2s;
}
.form-input:focus, .form-select:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(59,130,246,0.1); }
.form-actions { display: flex; gap: 0.75rem; margin-top: 0.5rem; flex-wrap: wrap; }

/* ── Buttons ── */
.btn {
  display: inline-flex; align-items: center; gap: 0.4rem;
  padding: 0.625rem 1.25rem; border-radius: 8px;
  font-size: 0.875rem; font-weight: 500; cursor: pointer;
  border: 1px solid transparent; text-decoration: none;
  transition: all 0.2s; white-space: nowrap;
}
.btn-primary { background: var(--accent); color: white; }
.btn-primary:hover { background: var(--accent-hover); }
.btn-success { background: var(--success); color: white; }
.btn-success:hover { background: #059669; }
.btn-danger { background: var(--danger); color: white; }
.btn-danger:hover { background: var(--danger-hover); }
.btn-outline { background: white; border-color: var(--border); color: var(--text); }
.btn-outline:hover { background: var(--card-hover); }
.btn-sm { padding: 0.375rem 0.75rem; font-size: 0.8rem; }
.btn-icon { padding: 0.375rem 0.5rem; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* ── Table ── */
.table-container { overflow-x: auto; }
.data-table {
  width: 100%; border-collapse: collapse;
  font-size: 0.875rem;
}
.data-table th {
  text-align: left; padding: 0.75rem 1rem;
  background: var(--bg); border-bottom: 2px solid var(--border);
  font-weight: 600; color: var(--muted); font-size: 0.75rem;
  text-transform: uppercase; letter-spacing: 0.05em;
}
.data-table td {
  padding: 0.875rem 1rem; border-bottom: 1px solid var(--border);
  vertical-align: middle;
}
.data-table tr:last-child td { border-bottom: none; }
.data-table tr:hover td { background: var(--card-hover); }
.table-actions { display: flex; gap: 0.5rem; flex-wrap: wrap; }

/* ── Badges ── */
.badge {
  display: inline-flex; align-items: center; gap: 0.25rem;
  padding: 0.25rem 0.625rem; border-radius: 20px;
  font-size: 0.75rem; font-weight: 600;
}
.badge-superadmin { background: linear-gradient(135deg,#7c3aed,#a78bfa); color: white; }
.badge-admin { background: #dbeafe; color: #1d4ed8; }
.badge-viewer { background: #f1f5f9; color: var(--muted); }
.badge-login { background: #dcfce7; color: #166534; }
.badge-logout { background: #fef9c3; color: #854d0e; }
.badge-delete_student { background: #fee2e2; color: #991b1b; }
.badge-delete_user { background: #fee2e2; color: #991b1b; }
.badge-upsert_user { background: #dbeafe; color: #1e40af; }
.badge-update_user { background: #fef3c7; color: #92400e; }
.badge-default { background: #f1f5f9; color: var(--muted); }

/* ── Log details ── */
.log-details {
  font-size: 0.75rem; color: var(--muted);
  font-family: ui-monospace, 'Cascadia Code', monospace;
  max-width: 280px; white-space: pre-wrap; word-break: break-all;
}
.log-time { font-size: 0.78rem; color: var(--muted); white-space: nowrap; }

/* ── Filters bar ── */
.filters { display: flex; gap: 0.75rem; flex-wrap: wrap; align-items: flex-end; margin-bottom: 1.25rem; }
.filters .form-group { min-width: 150px; }

/* ── Pagination ── */
.pagination { display: flex; gap: 0.5rem; align-items: center; justify-content: flex-end; margin-top: 1rem; }
.pagination .page-info { font-size: 0.875rem; color: var(--muted); margin-right: auto; }

/* ── Password toggle ── */
.pass-wrap { position: relative; }
.pass-wrap .form-input { padding-right: 2.5rem; width: 100%; }
.pass-toggle {
  position: absolute; right: 0.625rem; top: 50%; transform: translateY(-50%);
  border: none; background: none; cursor: pointer; color: var(--muted);
  padding: 0.25rem;
}

/* ── Empty state ── */
.empty-state {
  text-align: center; padding: 3rem 1rem; color: var(--muted);
}
.empty-state i { font-size: 2.5rem; margin-bottom: 1rem; display: block; }

/* ── Alert ── */
.alert {
  padding: 0.75rem 1rem; border-radius: 8px;
  font-size: 0.875rem; margin-bottom: 1rem;
  display: flex; align-items: center; gap: 0.5rem;
}
.alert-success { background: #dcfce7; color: #166534; border: 1px solid #bbf7d0; }
.alert-error { background: #fee2e2; color: #991b1b; border: 1px solid #fecaca; }
.alert.hidden { display: none; }

/* ── Spinner ── */
.fa-spin { animation: fa-spin 1s linear infinite; }
@keyframes fa-spin { 0%{transform:rotate(0deg)} 100%{transform:rotate(360deg)} }

/* ── Modal ── */
.modal-overlay {
  position: fixed; inset: 0; z-index: 200;
  background: rgba(0,0,0,0.5); backdrop-filter: blur(4px);
  display: flex; align-items: center; justify-content: center;
  padding: 1rem;
}
.modal-overlay.hidden { display: none; }
.modal-box {
  background: white; border-radius: var(--radius);
  padding: 2rem; max-width: 480px; width: 100%;
  box-shadow: 0 20px 60px rgba(0,0,0,0.3);
}
.modal-box .modal-title { font-size: 1.2rem; font-weight: 600; margin-bottom: 1.5rem; display: flex; align-items: center; gap: 0.5rem; }
.modal-box .modal-actions { display: flex; justify-content: flex-end; gap: 0.75rem; margin-top: 1.5rem; }

/* ── Responsive ── */
@media (max-width: 768px) {
  main { padding: 1rem; }
  .stats-bar { grid-template-columns: repeat(2, 1fr); }
  .tab-btn span { display: none; }
}