:root {
  --primary: #1e40af;
  --primary-dark: #1e3a8a;
  --success: #16a34a;
  --warning: #ca8a04;
  --danger: #dc2626;
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-500: #6b7280;
  --gray-700: #374151;
  --gray-900: #111827;
  --radius: 8px;
  --shadow: 0 1px 3px rgba(0,0,0,0.1);
  --shadow-lg: 0 4px 6px rgba(0,0,0,0.1);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--gray-100);
  color: var(--gray-900);
  line-height: 1.5;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

/* Screens */
.screen {
  display: none;
  min-height: 100vh;
}
.screen.active {
  display: block;
}

/* Login */
.login-container {
  max-width: 320px;
  margin: 0 auto;
  padding: 2rem 1rem;
  text-align: center;
}

.logo h1 {
  font-size: 2.5rem;
  color: var(--primary);
  margin-bottom: 0.25rem;
}
.logo p {
  color: var(--gray-500);
  margin-bottom: 2rem;
}

.login-section h2 {
  font-size: 1.25rem;
  margin-bottom: 1rem;
  color: var(--gray-700);
}

.pin-display {
  display: flex;
  justify-content: center;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}
.pin-dot {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  border: 2px solid var(--gray-300);
  background: transparent;
  transition: all 0.15s;
}
.pin-dot.filled {
  background: var(--primary);
  border-color: var(--primary);
}

.pin-pad {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
  max-width: 240px;
  margin: 0 auto 1rem;
}
.pin-btn {
  padding: 1rem;
  font-size: 1.5rem;
  font-weight: 500;
  border: none;
  border-radius: var(--radius);
  background: white;
  color: var(--gray-900);
  box-shadow: var(--shadow);
  cursor: pointer;
  transition: all 0.15s;
  -webkit-tap-highlight-color: transparent;
}
.pin-btn:active {
  background: var(--gray-100);
  transform: scale(0.95);
}

.link-btn {
  background: none;
  border: none;
  color: var(--primary);
  font-size: 0.875rem;
  cursor: pointer;
  padding: 0.5rem;
  margin-top: 1rem;
}

.hidden {
  display: none !important;
}

.error-msg {
  color: var(--danger);
  font-size: 0.875rem;
  margin-top: 0.5rem;
}
.success-msg {
  color: var(--success);
}
.status-msg {
  text-align: center;
  margin-top: 1rem;
  padding: 0.75rem;
  border-radius: var(--radius);
}
.status-msg.success {
  background: #dcfce7;
  color: var(--success);
}
.status-msg.error {
  background: #fee2e2;
  color: var(--danger);
}

/* Admin login */
#login-admin input {
  width: 100%;
  padding: 0.75rem 1rem;
  font-size: 1rem;
  border: 1px solid var(--gray-300);
  border-radius: var(--radius);
  margin-bottom: 1rem;
}

/* Header */
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem;
  background: var(--primary);
  color: white;
}
header h1 {
  font-size: 1.25rem;
  font-weight: 600;
}
.btn-icon {
  background: rgba(255,255,255,0.2);
  border: none;
  color: white;
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius);
  font-size: 0.875rem;
  cursor: pointer;
}

/* Tabs */
.tab-nav {
  display: flex;
  background: white;
  border-bottom: 1px solid var(--gray-200);
  overflow-x: auto;
}
.tab-btn {
  flex: 1;
  padding: 0.75rem 0.5rem;
  font-size: 0.875rem;
  font-weight: 500;
  border: none;
  background: none;
  color: var(--gray-500);
  border-bottom: 2px solid transparent;
  cursor: pointer;
  white-space: nowrap;
}
.tab-btn.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

.tab-content {
  display: none;
  padding: 1rem;
}
.tab-content.active {
  display: block;
}

/* Forms */
.form-group {
  margin-bottom: 1rem;
}
.form-group label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--gray-700);
  margin-bottom: 0.25rem;
}
.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 0.75rem;
  font-size: 1rem;
  border: 1px solid var(--gray-300);
  border-radius: var(--radius);
  background: white;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(30, 64, 175, 0.1);
}

.form-row {
  display: flex;
  gap: 1rem;
}
.form-row .form-group {
  flex: 1;
}

.form-group.checkbox {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.form-group.checkbox input {
  width: auto;
}
.form-group.checkbox label {
  margin: 0;
}

/* Buttons */
.btn {
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
  font-weight: 500;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  transition: all 0.15s;
}
.btn-primary {
  background: var(--primary);
  color: white;
}
.btn-primary:active {
  background: var(--primary-dark);
}
.btn-secondary {
  background: var(--gray-200);
  color: var(--gray-700);
}
.btn-success {
  background: var(--success);
  color: white;
}
.btn-danger {
  background: var(--danger);
  color: white;
}
.btn-full {
  width: 100%;
}
.btn-sm {
  padding: 0.5rem 0.75rem;
  font-size: 0.875rem;
}

/* Entry list */
.entry-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.entry-card {
  background: white;
  border-radius: var(--radius);
  padding: 1rem;
  box-shadow: var(--shadow);
}
.entry-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 0.5rem;
}
.entry-card-header h4 {
  font-size: 1rem;
  font-weight: 600;
}
.entry-card-meta {
  font-size: 0.875rem;
  color: var(--gray-500);
}
.entry-card-actions {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.75rem;
}

.badge {
  display: inline-block;
  padding: 0.25rem 0.5rem;
  font-size: 0.75rem;
  font-weight: 500;
  border-radius: 4px;
  text-transform: uppercase;
}
.badge-pending {
  background: #fef3c7;
  color: var(--warning);
}
.badge-approved {
  background: #dcfce7;
  color: var(--success);
}
.badge-paid {
  background: #dbeafe;
  color: var(--primary);
}
.badge-rejected {
  background: #fee2e2;
  color: var(--danger);
}

/* Modal */
.modal {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  z-index: 100;
}
.modal-content {
  background: white;
  border-radius: var(--radius);
  padding: 1.5rem;
  width: 100%;
  max-width: 400px;
  max-height: 90vh;
  overflow-y: auto;
}
.modal-content h2 {
  margin-bottom: 1rem;
}
.modal-content h4 {
  margin: 1rem 0 0.5rem;
  padding-top: 0.5rem;
  border-top: 1px solid var(--gray-200);
  font-size: 0.875rem;
  color: var(--gray-500);
}
.modal-actions {
  display: flex;
  gap: 0.75rem;
  margin-top: 1.5rem;
}
.modal-actions .btn {
  flex: 1;
}

/* Pay stub */
.paystub-section {
  margin-bottom: 1rem;
}
.paystub-section h4 {
  font-size: 0.75rem;
  text-transform: uppercase;
  color: var(--gray-500);
  margin-bottom: 0.5rem;
  border: none;
  padding: 0;
}
.paystub-row {
  display: flex;
  justify-content: space-between;
  padding: 0.25rem 0;
  font-size: 0.9rem;
}
.paystub-row.total {
  font-weight: 600;
  border-top: 1px solid var(--gray-200);
  padding-top: 0.5rem;
  margin-top: 0.25rem;
}
.paystub-row .label {
  color: var(--gray-700);
}
.paystub-row .value {
  font-weight: 500;
}
.paystub-row .value.negative {
  color: var(--danger);
}

/* Payroll preview */
.payroll-preview-card {
  background: white;
  border-radius: var(--radius);
  padding: 1rem;
  margin: 1rem 0;
  box-shadow: var(--shadow);
}
.payroll-totals {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.5rem;
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--gray-200);
}
.payroll-totals .stat {
  text-align: center;
}
.payroll-totals .stat-value {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--primary);
}
.payroll-totals .stat-label {
  font-size: 0.75rem;
  color: var(--gray-500);
}

.loading {
  text-align: center;
  color: var(--gray-500);
  padding: 2rem;
}

/* Empty state */
.empty-state {
  text-align: center;
  padding: 2rem;
  color: var(--gray-500);
}