@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600;700&display=swap');

:root {
  --primary: #2563EB;
  --primary-dark: #1D4ED8;
  --primary-light: #DBEAFE;
  --secondary: #10B981;
  --secondary-dark: #059669;
  --accent: #F59E0B;
  --accent-dark: #D97706;
  --danger: #EF4444;
  --danger-dark: #DC2626;
  --bg: #F8FAFC;
  --card-bg: #FFFFFF;
  --text-primary: #1E293B;
  --text-secondary: #64748B;
  --border: #E2E8F0;
  --shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-lg: 0 4px 6px rgba(0,0,0,0.1);
  --radius: 8px;
  --radius-sm: 6px;
  --radius-xs: 4px;
}

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

body {
  font-family: 'DM Sans', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text-primary);
  line-height: 1.5;
  min-height: 100vh;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  font-size: 14px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  transition: all 150ms ease-in-out;
  text-decoration: none;
}

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

.btn-primary:hover {
  background: var(--primary-dark);
}

.btn-secondary {
  background: white;
  color: var(--primary);
  border: 1px solid var(--primary);
}

.btn-secondary:hover {
  background: var(--primary-light);
}

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

.btn-danger:hover {
  background: var(--danger-dark);
}

.btn-sm {
  padding: 6px 12px;
  font-size: 13px;
}

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

.card {
  background: var(--card-bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px;
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

.card-title {
  font-size: 18px;
  font-weight: 600;
}

.form-group {
  margin-bottom: 16px;
}

.form-label {
  display: block;
  font-size: 14px;
  font-weight: 500;
  margin-bottom: 6px;
  color: var(--text-primary);
}

.form-input, .form-select, .form-textarea {
  width: 100%;
  padding: 10px 14px;
  font-size: 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-xs);
  background: white;
  transition: border-color 150ms, box-shadow 150ms;
}

.form-input:focus, .form-select:focus, .form-textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-light);
}

.form-input.error {
  border-color: var(--danger);
}

.error-text {
  color: var(--danger);
  font-size: 13px;
  margin-top: 4px;
}

.auth-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #EEF2FF 0%, #E0E7FF 100%);
  padding: 20px;
}

.auth-card {
  width: 100%;
  max-width: 400px;
  background: white;
  border-radius: var(--radius);
  box-shadow: 0 4px 20px rgba(0,0,0,0.08);
  padding: 40px;
}

.auth-logo {
  text-align: center;
  margin-bottom: 32px;
}

.auth-logo h1 {
  font-size: 28px;
  font-weight: 700;
  color: var(--primary);
}

.auth-logo p {
  color: var(--text-secondary);
  font-size: 14px;
  margin-top: 4px;
}

.auth-header {
  text-align: center;
  margin-bottom: 24px;
}

.auth-header h2 {
  font-size: 20px;
  font-weight: 600;
}

.auth-footer {
  text-align: center;
  margin-top: 20px;
  font-size: 14px;
  color: var(--text-secondary);
}

.auth-footer a {
  color: var(--primary);
  text-decoration: none;
  font-weight: 500;
}

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

.header {
  background: white;
  border-bottom: 1px solid var(--border);
  padding: 16px 0;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 20px;
  font-weight: 700;
  color: var(--primary);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 8px;
}

.logo-icon {
  width: 32px;
  height: 32px;
  background: var(--primary);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 700;
}

.nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-link {
  padding: 8px 16px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: var(--radius-sm);
  transition: all 150ms;
}

.nav-link:hover {
  background: var(--bg);
  color: var(--text-primary);
}

.nav-link.active {
  background: var(--primary-light);
  color: var(--primary);
}

.user-menu {
  display: flex;
  align-items: center;
  gap: 12px;
}

.user-name {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-primary);
}

.page {
  padding: 32px 0;
}

.page-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
}

.page-title {
  font-size: 24px;
  font-weight: 700;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
  margin-bottom: 32px;
}

.stat-card {
  background: white;
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
}

.stat-label {
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 4px;
}

.stat-value {
  font-size: 28px;
  font-weight: 700;
}

.stat-value.primary { color: var(--primary); }
.stat-value.success { color: var(--secondary); }
.stat-value.warning { color: var(--accent); }
.stat-value.danger { color: var(--danger); }

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

.table {
  width: 100%;
  border-collapse: collapse;
}

.table th, .table td {
  padding: 14px 20px;
  text-align: left;
}

.table th {
  background: var(--bg);
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border);
}

.table td {
  font-size: 14px;
  border-bottom: 1px solid var(--border);
}

.table tr:last-child td {
  border-bottom: none;
}

.table tr:hover td {
  background: var(--bg);
}

.badge {
  display: inline-block;
  padding: 4px 10px;
  font-size: 12px;
  font-weight: 600;
  border-radius: 20px;
}

.badge-draft { background: #F1F5F9; color: #64748B; }
.badge-sent { background: #FEF3C7; color: #D97706; }
.badge-paid { background: #D1FAE5; color: #059669; }
.badge-overdue { background: #FEE2E2; color: #DC2626; }

.table-actions {
  display: flex;
  gap: 8px;
}

.action-btn {
  padding: 6px 10px;
  font-size: 13px;
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius-xs);
  cursor: pointer;
  color: var(--text-secondary);
  transition: all 150ms;
}

.action-btn:hover {
  background: var(--bg);
  color: var(--text-primary);
}

.action-btn.danger:hover {
  background: #FEE2E2;
  color: var(--danger);
  border-color: var(--danger);
}

.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-secondary);
}

.empty-state h3 {
  font-size: 18px;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.empty-state p {
  margin-bottom: 20px;
}

.filters {
  display: flex;
  gap: 12px;
  margin-bottom: 20px;
}

.filter-btn {
  padding: 8px 16px;
  font-size: 13px;
  font-weight: 500;
  background: white;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  color: var(--text-secondary);
  transition: all 150ms;
}

.filter-btn:hover, .filter-btn.active {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}

.invoice-form {
  max-width: 800px;
}

.items-table {
  width: 100%;
  margin-bottom: 16px;
}

.items-table th {
  text-align: left;
  padding: 10px;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
  background: var(--bg);
}

.items-table td {
  padding: 10px;
  border-bottom: 1px solid var(--border);
}

.items-table input {
  width: 100%;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius-xs);
  font-size: 14px;
}

.items-table input:focus {
  outline: none;
  border-color: var(--primary);
}

.items-table .amount {
  font-weight: 600;
  color: var(--text-primary);
}

.remove-item-btn {
  background: none;
  border: none;
  color: var(--danger);
  cursor: pointer;
  padding: 4px;
  font-size: 18px;
}

.totals-section {
  display: flex;
  justify-content: flex-end;
  margin-top: 20px;
}

.totals-box {
  width: 250px;
}

.total-row {
  display: flex;
  justify-content: space-between;
  padding: 8px 0;
  font-size: 14px;
}

.total-row.grand {
  border-top: 2px solid var(--text-primary);
  font-weight: 700;
  font-size: 18px;
  margin-top: 8px;
  padding-top: 12px;
}

.form-actions {
  display: flex;
  gap: 12px;
  margin-top: 24px;
}

.invoice-view {
  max-width: 800px;
  margin: 0 auto;
}

.invoice-header {
  display: flex;
  justify-content: space-between;
  margin-bottom: 40px;
}

.invoice-title {
  font-size: 32px;
  font-weight: 700;
  color: var(--primary);
}

.invoice-meta {
  text-align: right;
  color: var(--text-secondary);
}

.invoice-meta strong {
  color: var(--text-primary);
}

.invoice-parties {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.party h4 {
  font-size: 12px;
  text-transform: uppercase;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.party p {
  margin-bottom: 4px;
}

.invoice-items-table {
  width: 100%;
  margin-bottom: 30px;
}

.invoice-items-table th {
  background: var(--text-primary);
  color: white;
  padding: 12px;
  text-align: left;
  font-size: 12px;
  text-transform: uppercase;
}

.invoice-items-table td {
  padding: 12px;
  border-bottom: 1px solid var(--border);
}

.invoice-totals {
  display: flex;
  justify-content: flex-end;
}

.invoice-totals-box {
  width: 250px;
}

.invoice-notes {
  margin-top: 40px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}

.invoice-notes h4 {
  font-size: 12px;
  text-transform: uppercase;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.invoice-actions {
  display: flex;
  gap: 12px;
  margin-top: 30px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}

.settings-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.settings-section h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

.swal2-container {
  font-family: 'DM Sans', system-ui, sans-serif;
}

.loading {
  opacity: 0.6;
  pointer-events: none;
}

.hidden {
  display: none !important;
}

.text-center { text-align: center; }
.text-right { text-align: right; }
.mb-0 { margin-bottom: 0; }
.mb-2 { margin-bottom: 8px; }
.mb-4 { margin-bottom: 16px; }
.mb-6 { margin-bottom: 24px; }
.mt-4 { margin-top: 16px; }

@media (max-width: 768px) {
  .header-content {
    flex-direction: column;
    gap: 16px;
  }
  
  .nav {
    flex-wrap: wrap;
    justify-content: center;
  }
  
  .stats-grid {
    grid-template-columns: 1fr 1fr;
  }
  
  .invoice-parties, .settings-grid {
    grid-template-columns: 1fr;
  }
  
  .table-container {
    overflow-x: auto;
  }
}