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

:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --primary-light: #dbeafe;
  --success: #16a34a;
  --success-light: #dcfce7;
  --danger: #dc2626;
  --danger-light: #fee2e2;
  --warning: #d97706;
  --warning-light: #fef3c7;
  --gray-50: #f8fafc;
  --gray-100: #f1f5f9;
  --gray-200: #e2e8f0;
  --gray-300: #cbd5e1;
  --gray-400: #94a3b8;
  --gray-500: #64748b;
  --gray-600: #475569;
  --gray-700: #334155;
  --gray-800: #1e293b;
  --gray-900: #0f172a;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 25px rgba(0,0,0,0.1), 0 4px 10px rgba(0,0,0,0.06);
}

html { font-size: 16px; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  min-height: 100vh;
  color: var(--gray-800);
  line-height: 1.5;
}

#app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.navbar {
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(10px);
  padding: 0.75rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 100;
}

.navbar.hidden { display: none; }

.nav-brand {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary);
  letter-spacing: -0.5px;
}

.nav-user {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.875rem;
  color: var(--gray-600);
}

.nav-badge {
  padding: 0.125rem 0.5rem;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
  background: var(--primary-light);
  color: var(--primary);
}

.nav-badge.admin { background: #fef3c7; color: #92400e; }

#mainContent {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem 1rem;
}

.view { display: none; width: 100%; }
.view.active { display: flex; align-items: center; justify-content: center; }

.auth-card {
  background: white;
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  padding: 2.5rem;
  width: 100%;
  max-width: 460px;
  animation: fadeUp 0.3s ease;
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

.auth-header {
  text-align: center;
  margin-bottom: 2rem;
}

.auth-header h1 {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--gray-900);
}

.auth-header p {
  color: var(--gray-500);
  margin-top: 0.25rem;
  font-size: 0.9rem;
}

.auth-form { display: flex; flex-direction: column; gap: 1rem; }

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
}

.form-group label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--gray-700);
}

.form-group input,
.form-group select {
  padding: 0.625rem 0.875rem;
  border: 1.5px solid var(--gray-200);
  border-radius: var(--radius-sm);
  font-size: 0.925rem;
  transition: border-color 0.2s, box-shadow 0.2s;
  outline: none;
  font-family: inherit;
}

.form-group input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37,99,235,0.15);
}

.form-error {
  color: var(--danger);
  font-size: 0.85rem;
  text-align: center;
  min-height: 1.25rem;
}

.form-success {
  color: var(--success);
  font-size: 0.85rem;
  text-align: center;
  min-height: 1.25rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.625rem 1.25rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  border: 1.5px solid transparent;
  cursor: pointer;
  transition: all 0.2s;
  font-family: inherit;
  text-decoration: none;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}

.btn-primary:hover:not(:disabled) {
  background: var(--primary-dark);
  border-color: var(--primary-dark);
}

.btn-outline {
  background: transparent;
  color: var(--gray-700);
  border-color: var(--gray-300);
}

.btn-outline:hover:not(:disabled) {
  background: var(--gray-50);
  border-color: var(--gray-400);
}

.btn-danger {
  background: var(--danger);
  color: white;
  border-color: var(--danger);
}

.btn-danger:hover:not(:disabled) {
  background: #b91c1c;
  border-color: #b91c1c;
}

.btn-success {
  background: var(--success);
  color: white;
  border-color: var(--success);
}

.btn-success:hover:not(:disabled) {
  background: #15803d;
  border-color: #15803d;
}

.btn-sm { padding: 0.375rem 0.75rem; font-size: 0.8rem; }
.btn-block { width: 100%; }

.auth-link {
  text-align: center;
  font-size: 0.875rem;
  color: var(--gray-500);
}

.auth-link a {
  color: var(--primary);
  text-decoration: none;
  font-weight: 600;
}

.auth-link a:hover { text-decoration: underline; }

.dashboard {
  width: 100%;
  max-width: 900px;
  animation: fadeUp 0.3s ease;
}

.welcome-card {
  background: white;
  border-radius: var(--radius);
  padding: 1.5rem 2rem;
  box-shadow: var(--shadow);
  margin-bottom: 1.5rem;
}

.welcome-card h2 { font-size: 1.35rem; color: var(--gray-900); }
.text-muted { color: var(--gray-500); font-size: 0.875rem; }

.status-card {
  background: white;
  border-radius: var(--radius);
  padding: 2rem;
  box-shadow: var(--shadow);
  display: flex;
  gap: 1.5rem;
  align-items: flex-start;
  margin-bottom: 1.5rem;
}

.status-icon {
  flex-shrink: 0;
  width: 64px;
  height: 64px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
}

.status-icon.pending { background: var(--warning); }
.status-icon.active { background: var(--success); }
.status-icon.revoked { background: var(--danger); }
.status-icon.inactive { background: var(--gray-400); }

.status-info h3 { font-size: 1.1rem; margin-bottom: 0.25rem; }
.status-info p { color: var(--gray-500); font-size: 0.875rem; }

.status-details {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--gray-200);
}

.detail-row {
  display: flex;
  gap: 0.5rem;
  font-size: 0.85rem;
  margin-bottom: 0.375rem;
}

.detail-row span { color: var(--gray-500); min-width: 80px; }
.detail-row code {
  color: var(--gray-700);
  background: var(--gray-100);
  padding: 0.125rem 0.375rem;
  border-radius: 4px;
  font-size: 0.8rem;
  word-break: break-all;
}

.actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.admin-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.stat-card {
  background: white;
  border-radius: var(--radius-sm);
  padding: 1.25rem;
  box-shadow: var(--shadow);
  text-align: center;
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--gray-900);
}

.stat-card::before {
  display: block;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--gray-500);
  margin-bottom: 0.25rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

#statTotal::before { content: 'Total'; }
#statActive::before { content: 'Activos'; color: var(--success); }
#statPending::before { content: 'Pendientes'; color: var(--warning); }
#statRevoked::before { content: 'Revocados'; color: var(--danger); }

.table-wrap {
  background: white;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  overflow-x: auto;
}

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

.user-table th {
  background: var(--gray-50);
  color: var(--gray-600);
  font-weight: 600;
  text-align: left;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--gray-200);
  white-space: nowrap;
}

.user-table td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--gray-100);
  vertical-align: middle;
}

.user-table tr:last-child td { border-bottom: none; }
.user-table tr:hover td { background: var(--gray-50); }

.badge {
  display: inline-block;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
  white-space: nowrap;
}

.badge-active { background: var(--success-light); color: var(--success); }
.badge-pending { background: var(--warning-light); color: var(--warning); }
.badge-revoked { background: var(--danger-light); color: var(--danger); }
.badge-inactive { background: var(--gray-200); color: var(--gray-600); }
.badge-cert-yes { background: var(--success-light); color: var(--success); }
.badge-cert-no { background: var(--gray-200); color: var(--gray-600); }
.badge-admin { background: #fef3c7; color: #92400e; }

.action-btns {
  display: flex;
  gap: 0.375rem;
  flex-wrap: wrap;
}

.toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  background: var(--gray-900);
  color: white;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
  box-shadow: var(--shadow-lg);
  z-index: 200;
  transition: opacity 0.3s, transform 0.3s;
  max-width: 90vw;
  text-align: center;
}

.toast.hidden { opacity: 0; transform: translateX(-50%) translateY(12px); pointer-events: none; }
.toast.success { background: var(--success); }
.toast.error { background: var(--danger); }

.verify-card input[type="file"] {
  font-family: inherit;
  font-size: 0.9rem;
  color: var(--gray-700);
}
.verify-card input[type="file"]::file-selector-button {
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius-sm);
  border: 1.5px solid var(--gray-300);
  background: var(--gray-50);
  font-family: inherit;
  font-size: 0.85rem;
  cursor: pointer;
  margin-right: 0.5rem;
  transition: background 0.15s;
}
.verify-card input[type="file"]::file-selector-button:hover {
  background: var(--gray-200);
}

#verifyResult:not(.hidden) { display: block; animation: fadeUp 0.3s ease; }

.status-icon.valid { background: var(--success); }
.status-icon.invalid { background: var(--danger); }

@media (max-width: 768px) {
  #viewVerify .dashboard { max-width: 100%; }
  #verifyDetails .detail-row { flex-direction: column; gap: 0.125rem; }
  #verifyDetails .detail-row span { min-width: unset; }
}

@media (max-width: 768px) {
  .auth-card { padding: 1.5rem; }
  .form-row { grid-template-columns: 1fr; }
  .admin-stats { grid-template-columns: repeat(2, 1fr); }
  .status-card { flex-direction: column; align-items: center; text-align: center; }
  .actions { justify-content: center; }
  .navbar { padding: 0.5rem 1rem; }
  .nav-user { gap: 0.5rem; }
  .nav-user span { display: none; }
  .user-table { font-size: 0.8rem; }
  .user-table th,
  .user-table td { padding: 0.5rem 0.625rem; }
  .action-btns .btn { font-size: 0.75rem; padding: 0.3rem 0.5rem; }
}

@media (max-width: 480px) {
  #mainContent { padding: 1rem 0.5rem; }
  .auth-card { border-radius: 0; box-shadow: none; padding: 1.25rem; }
  .admin-stats { grid-template-columns: 1fr 1fr; gap: 0.5rem; }
  .stat-card { padding: 0.75rem; font-size: 1.25rem; }
}