:root {
  --bg: #f0f2f5;
  --card: #ffffff;
  --text: #1a1a2e;
  --text-secondary: #6b7280;
  --primary: #3b82f6;
  --primary-hover: #2563eb;
  --danger: #ef4444;
  --success: #10b981;
  --warning: #f59e0b;
  --border: #e5e7eb;
  --sidebar-bg: #1a1a2e;
  --sidebar-text: #e5e7eb;
  --sidebar-active: #3b82f6;
  --radius: 8px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

/* ── Login Page ── */
.login-body {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
}

.login-card {
  background: var(--card);
  border-radius: 16px;
  padding: 3rem 2.5rem;
  max-width: 400px;
  width: 90%;
  box-shadow: 0 4px 24px rgba(0,0,0,0.08);
  text-align: center;
}

.login-card h1 {
  font-size: 1.75rem;
  margin-bottom: 0.25rem;
}

.login-card p {
  color: var(--text-secondary);
  margin-bottom: 2rem;
}

.btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  width: 100%;
  padding: 12px 16px;
  margin: 10px 0;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--card);
  font-size: 0.95rem;
  cursor: pointer;
  text-decoration: none;
  color: var(--text);
  transition: all 0.15s;
}

.btn:hover { background: #f8f9fa; border-color: #ccc; }
.btn-github:hover { background: #24292e; color: white; }
.btn-google:hover { background: #f8f9fa; }
.btn-microsoft:hover { background: #00a4ef; color: white; }
.btn-primary { background: var(--primary); color: white; border-color: var(--primary); }
.btn-primary:hover { background: var(--primary-hover); color: white; }
.btn-danger { background: var(--danger); color: white; border-color: var(--danger); }
.btn-danger:hover { opacity: 0.9; color: white; }
.btn-sm { padding: 6px 12px; font-size: 0.8rem; width: auto; margin: 0; }

/* ── Dashboard Layout ── */
.layout {
  display: flex;
  min-height: 100vh;
}

.sidebar {
  width: 240px;
  background: var(--sidebar-bg);
  color: var(--sidebar-text);
  padding: 1.5rem 0;
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  overflow-y: auto;
}

.sidebar-brand {
  padding: 0 1.5rem 1.5rem;
  font-size: 1.1rem;
  font-weight: 700;
  border-bottom: 1px solid rgba(255,255,255,0.1);
  margin-bottom: 1rem;
}

.sidebar-nav { list-style: none; }

.sidebar-nav a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 1.5rem;
  color: var(--sidebar-text);
  text-decoration: none;
  font-size: 0.9rem;
  transition: all 0.15s;
  border-left: 3px solid transparent;
}

.sidebar-nav a:hover,
.sidebar-nav a.active {
  background: rgba(255,255,255,0.08);
  border-left-color: var(--sidebar-active);
  color: white;
}

.sidebar-user {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 1rem 1.5rem;
  border-top: 1px solid rgba(255,255,255,0.1);
  font-size: 0.85rem;
}

.sidebar-user .email { color: rgba(255,255,255,0.5); font-size: 0.75rem; }

.main {
  flex: 1;
  margin-left: 240px;
  padding: 2rem;
}

.main-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
}

.main-header h2 { font-size: 1.5rem; }

/* ── Stats Cards ── */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin-bottom: 2rem;
}

.stat-card {
  background: var(--card);
  border-radius: var(--radius);
  padding: 1.25rem;
  box-shadow: 0 1px 3px rgba(0,0,0,0.06);
}

.stat-card .label {
  font-size: 0.8rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.stat-card .value {
  font-size: 2rem;
  font-weight: 700;
  margin-top: 0.25rem;
}

.stat-card .value.success { color: var(--success); }
.stat-card .value.danger { color: var(--danger); }
.stat-card .value.primary { color: var(--primary); }

/* ── Tables ── */
.card {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: 0 1px 3px rgba(0,0,0,0.06);
  overflow: hidden;
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border);
}

.card-header h3 { font-size: 1rem; }

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}

th, td {
  padding: 10px 1.25rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

th {
  font-weight: 600;
  color: var(--text-secondary);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

tr:last-child td { border-bottom: none; }
tr:hover td { background: #f9fafb; }

.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 12px;
  font-size: 0.75rem;
  font-weight: 600;
}

.badge-admin { background: #dbeafe; color: #1d4ed8; }
.badge-user { background: #f3f4f6; color: #4b5563; }
.badge-success { background: #d1fae5; color: #065f46; }
.badge-error { background: #fee2e2; color: #991b1b; }
.badge-github { background: #24292e; color: white; }
.badge-google { background: #ea4335; color: white; }
.badge-microsoft { background: #00a4ef; color: white; }

/* ── Forms & Filters ── */
.filters {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border);
}

.filters input, .filters select {
  padding: 6px 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.85rem;
  background: white;
}

.pagination {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 1.25rem;
  border-top: 1px solid var(--border);
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.pagination button {
  padding: 4px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: white;
  cursor: pointer;
  font-size: 0.8rem;
}

.pagination button:hover { background: #f3f4f6; }
.pagination button:disabled { opacity: 0.5; cursor: not-allowed; }

/* ── Modal ── */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.4);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 100;
}

.modal {
  background: var(--card);
  border-radius: 12px;
  padding: 2rem;
  width: 90%;
  max-width: 480px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.15);
}

.modal h3 { margin-bottom: 1rem; }

.form-group {
  margin-bottom: 1rem;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.form-group input, .form-group select {
  width: 100%;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.9rem;
}

.modal-actions {
  display: flex;
  gap: 0.5rem;
  justify-content: flex-end;
  margin-top: 1.5rem;
}

/* ── Utilities ── */
.text-muted { color: var(--text-secondary); }
.text-sm { font-size: 0.85rem; }
.mt-1 { margin-top: 0.5rem; }
.hidden { display: none; }

/* ── Loading ── */
.loading {
  text-align: center;
  padding: 3rem;
  color: var(--text-secondary);
}

@media (max-width: 768px) {
  .sidebar { width: 200px; }
  .main { margin-left: 200px; padding: 1rem; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
}