:root {
  --bg-main: #f8fafc;
  --bg-card: #ffffff;
  --border-color: #e2e8f0;
  --text-main: #0f172a;
  --text-muted: #64748b;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-light: #eff6ff;
  --success: #10b981;
  --success-hover: #059669;
  --danger: #ef4444;
  --danger-hover: #dc2626;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background-color: var(--bg-main);
  color: var(--text-main);
  line-height: 1.5;
  min-height: 100vh;
}

/* Header */
.top-nav {
  background-color: #ffffff;
  border-bottom: 1px solid var(--border-color);
  padding: 0.75rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 40;
  box-shadow: var(--shadow-sm);
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.brand-logo {
  background: linear-gradient(135deg, #1e293b, #0f172a);
  color: #ffffff;
  font-weight: 800;
  font-size: 1.1rem;
  padding: 0.4rem 0.65rem;
  border-radius: var(--radius-sm);
  letter-spacing: -0.5px;
}

.brand-text {
  display: flex;
  flex-direction: column;
}

.brand-title {
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.2px;
}

.brand-subtitle {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.user-pill {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background-color: var(--bg-main);
  padding: 0.35rem 0.75rem;
  border-radius: 9999px;
  font-size: 0.85rem;
  font-weight: 500;
  border: 1px solid var(--border-color);
}

.status-indicator {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--success);
}

.role-badge {
  background-color: var(--primary-light);
  color: var(--primary);
  font-size: 0.7rem;
  font-weight: 700;
  padding: 0.15rem 0.45rem;
  border-radius: 4px;
  text-transform: uppercase;
}

/* Main Content */
.main-content {
  max-width: 1000px;
  margin: 2rem auto;
  padding: 0 1.5rem;
}

/* Auth Card */
.auth-card-wrapper {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 70vh;
}

.auth-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  width: 100%;
  max-width: 420px;
  box-shadow: var(--shadow-lg);
}

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

.auth-logo {
  background: #0f172a;
  color: #fff;
  font-weight: 800;
  font-size: 1.5rem;
  width: 54px;
  height: 54px;
  line-height: 54px;
  margin: 0 auto 1rem;
  border-radius: var(--radius-md);
}

.auth-header h2 {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 0.35rem;
}

.auth-header p {
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* Cards */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  margin-bottom: 2rem;
  overflow: hidden;
}

.card-header {
  padding: 1.25rem 1.75rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  gap: 1rem;
  background-color: #fafbfc;
}

.step-badge {
  background-color: var(--primary);
  color: #ffffff;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.95rem;
  flex-shrink: 0;
}

.card-header h3 {
  font-size: 1.15rem;
  font-weight: 700;
}

.card-body {
  padding: 1.75rem;
}

/* Upload Dropzone */
.drop-zone {
  border: 2px dashed #cbd5e1;
  border-radius: var(--radius-md);
  padding: 3rem 2rem;
  text-align: center;
  background-color: #f8fafc;
  cursor: pointer;
  transition: all 0.2s ease;
}

.drop-zone:hover, .drop-zone.dragover {
  border-color: var(--primary);
  background-color: var(--primary-light);
}

.drop-zone-icon {
  font-size: 3rem;
  margin-bottom: 0.75rem;
}

.drop-zone h4 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.drop-zone button {
  margin-top: 1.25rem;
}

.status-banner {
  margin-top: 1rem;
  padding: 0.85rem 1.25rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
}

.status-banner.success {
  background-color: #ecfdf5;
  color: #065f46;
  border: 1px solid #a7f3d0;
}

.status-banner.loading {
  background-color: var(--primary-light);
  color: var(--primary-hover);
  border: 1px solid #bfdbfe;
}

.status-banner.error {
  background-color: #fef2f2;
  color: #991b1b;
  border: 1px solid #fecaca;
}

/* Form Styles */
.form-section {
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 1.5rem;
  margin-bottom: 1.5rem;
}

.form-section:last-of-type {
  border-bottom: none;
  padding-bottom: 0;
  margin-bottom: 0;
}

.section-title {
  font-size: 1rem;
  font-weight: 700;
  color: #1e293b;
  margin-bottom: 1.25rem;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
}

.form-group {
  margin-bottom: 1rem;
  display: flex;
  flex-direction: column;
}

label {
  font-size: 0.825rem;
  font-weight: 600;
  color: #334155;
  margin-bottom: 0.35rem;
}

input[type="text"],
input[type="password"],
input[type="number"],
select {
  width: 100%;
  padding: 0.6rem 0.85rem;
  border: 1px solid #cbd5e1;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  color: var(--text-main);
  background-color: #ffffff;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

input:focus, select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

small.text-muted {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

/* Banners */
.subtotal-banner, .grand-total-banner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.85rem 1.25rem;
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-weight: 500;
  margin-top: 0.75rem;
}

.subtotal-banner {
  background-color: #f1f5f9;
  color: #334155;
}

.grand-total-banner {
  background-color: #eff6ff;
  border: 1px solid #bfdbfe;
  color: var(--primary-hover);
  font-size: 1.15rem;
}

.dual-vat-box {
  background-color: #f8fafc;
  border: 1px solid var(--border-color);
  padding: 1.25rem;
  border-radius: var(--radius-sm);
  margin-bottom: 1rem;
}

/* Checkbox */
.checkbox-group {
  margin-top: 0.75rem;
}

.custom-checkbox {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  user-select: none;
}

.custom-checkbox input {
  width: 18px;
  height: 18px;
  cursor: pointer;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.6rem 1.25rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.15s ease;
}

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

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

.btn-secondary {
  background-color: #334155;
  color: #ffffff;
}

.btn-secondary:hover {
  background-color: #1e293b;
}

.btn-outline {
  background-color: transparent;
  border-color: #cbd5e1;
  color: #334155;
}

.btn-outline:hover {
  background-color: #f1f5f9;
}

.btn-success {
  background-color: var(--success);
  color: #ffffff;
}

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

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

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

.btn-sm {
  padding: 0.35rem 0.75rem;
  font-size: 0.8rem;
}

.btn-block {
  width: 100%;
}

.action-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-color);
  flex-wrap: wrap;
  gap: 1rem;
}

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

/* Alerts */
.alert-box {
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: 1rem;
}

.alert-error {
  background-color: #fef2f2;
  color: #991b1b;
  border: 1px solid #fecaca;
}

.alert-success {
  background-color: #ecfdf5;
  color: #065f46;
  border: 1px solid #a7f3d0;
}

/* Modals */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 1.5rem;
}

.modal-dialog {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 480px;
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  animation: modalFadeIn 0.2s ease;
}

.modal-dialog.modal-lg {
  max-width: 750px;
}

.modal-dialog.modal-xl {
  max-width: 1100px;
  height: 90vh;
  display: flex;
  flex-direction: column;
}

@keyframes modalFadeIn {
  from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: translateY(0); }
}

.modal-header {
  padding: 1.25rem 1.75rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal-header h3 {
  font-size: 1.2rem;
  font-weight: 700;
}

.modal-close {
  background: transparent;
  border: none;
  font-size: 1.5rem;
  color: var(--text-muted);
  cursor: pointer;
  line-height: 1;
}

.modal-close:hover {
  color: var(--text-main);
}

.modal-body {
  padding: 1.75rem;
}

.modal-body-pdf {
  padding: 0;
  flex: 1;
  display: flex;
}

.pdf-iframe {
  width: 100%;
  height: 100%;
  border: none;
}

.preview-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* User Mgmt Table */
.user-mgmt-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.25rem;
}

.create-user-box {
  background-color: #f8fafc;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  margin-bottom: 1.5rem;
}

.create-user-box h5 {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 0.85rem;
}

.grid-3-form {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.form-actions-full {
  grid-column: 1 / -1;
  display: flex;
  gap: 0.5rem;
}

.table-responsive {
  overflow-x: auto;
}

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

.data-table th, .data-table td {
  padding: 0.75rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}

.data-table th {
  background-color: #f8fafc;
  font-weight: 600;
  color: #475569;
}

.data-table tr:hover {
  background-color: #fafbfc;
}

@media (max-width: 768px) {
  .grid-3, .grid-2, .grid-3-form {
    grid-template-columns: 1fr;
  }
  .top-nav {
    padding: 0.75rem 1rem;
    flex-direction: column;
    gap: 0.75rem;
  }
  .action-bar {
    flex-direction: column;
    align-items: stretch;
  }
  .action-group {
    flex-direction: column;
  }
}