.app-layout {
  display: flex;
  min-height: 0;
  overflow: hidden;
}

.sidebar {
  width: 220px;
  background: var(--color-surface);
  border-right: 1px solid var(--color-border);
  padding: 20px 0;
  flex-shrink: 0;
}

.sidebar-heading {
  font-size: 0.6875rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 0 20px 10px;
}

.sidebar-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 20px;
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  text-decoration: none;
  border-left: 3px solid transparent;
  transition: background 0.15s, color 0.15s;
}

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

.sidebar-link.active {
  color: var(--color-primary);
  background: var(--color-primary-light);
  border-left-color: var(--color-primary);
  font-weight: 600;
}

.sidebar-link-icon {
  font-size: 1.1rem;
  width: 22px;
  text-align: center;
}

.hamburger {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  flex-direction: column;
  gap: 5px;
  padding: 4px;
}

.hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform 0.2s;
}

.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.4);
  z-index: 49;
}

.sidebar-overlay.open {
  display: block;
}

.content-column {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-width: 0;
}

.page-header {
  flex-shrink: 0;
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--color-bg);
  padding: 32px 40px 20px;
}

.view-content {
  flex: 1;
  min-height: 0;
  padding: 0 40px 32px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

#view-container {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
}

/* Grid pages (invoices, clients, templates): no window scroll, inner grid scrolls */
#view-container.grid-page {
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

#view-container.grid-page > .toolbar {
  flex-shrink: 0;
}

#view-container.grid-page > .toolbar + .card {
  flex: 1;
  min-height: 0;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  padding: 0;
}

#view-container.grid-page > .toolbar + .card > .table-scroll {
  flex: 1;
  overflow: auto;
  min-height: 0;
}

#view-container.grid-page > #template-cards {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
}

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

.form-label {
  display: block;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  margin-bottom: 4px;
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 8px 12px;
  font-size: 0.875rem;
  font-family: inherit;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  color: var(--color-text);
  transition: border-color 0.15s;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-textarea {
  resize: vertical;
  min-height: 80px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  font-size: 0.875rem;
  font-weight: 600;
  font-family: inherit;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background 0.15s, opacity 0.15s;
}

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

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

.btn-primary:hover:not(:disabled) {
  background: #1d4ed8;
}

.btn-secondary {
  background: var(--color-surface);
  color: var(--color-text-secondary);
  border-color: var(--color-border);
}

.btn-secondary:hover:not(:disabled) {
  background: var(--color-bg);
}

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

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

.btn-sm {
  padding: 4px 10px;
  font-size: 0.75rem;
}

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

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

.line-items-table {
  width: 100%;
  margin-top: 8px;
}

.line-items-table th {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 8px 8px 4px;
  text-align: left;
  border-bottom: 2px solid var(--color-border);
}

.line-items-table td {
  padding: 6px 8px;
  vertical-align: top;
}

.line-items-table .form-input {
  padding: 6px 8px;
  font-size: 0.8125rem;
}

.template-card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  margin-bottom: 12px;
}

.template-card:hover {
  box-shadow: var(--shadow-md);
}

.template-card-name {
  font-weight: 600;
  margin-bottom: 4px;
}

.template-card-desc {
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
}

.template-card-items {
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
  margin-top: 8px;
}

.template-item-row {
  display: flex;
  justify-content: space-between;
  padding: 2px 0;
}

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

.modal {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  box-shadow: 0 20px 60px rgba(0,0,0,0.15);
  width: 90%;
  max-width: 720px;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.modal-sm { max-width: 400px; }
.modal-md { max-width: 560px; }
.modal-lg { max-width: 720px; }

.modal-header {
  flex-shrink: 0;
  padding: 32px 32px 0;
}

.modal-body {
  flex: 1 1 auto;
  overflow-y: auto;
  padding: 20px 32px 0;
}

.modal-title {
  font-size: 1.25rem;
  font-weight: 700;
}

.modal-total {
  flex-shrink: 0;
  text-align: right;
  font-weight: 700;
  font-size: 1.1rem;
  padding: 16px 32px;
  border-top: 1px solid var(--color-border);
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  padding: 0 24px 24px;
}

@media (max-width: 768px) {
  .sidebar {
    width: 180px;
  }

  .page-header {
      padding: 20px 16px 16px;
    }

  .view-content {
    padding: 0 16px 20px;
  }

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

  .modal {
    width: 95%;
  }

  .modal-header {
    padding: 20px 20px 0;
  }

  .modal-body {
    padding: 16px 20px 0;
  }

  .modal-total {
    padding: 12px 20px;
  }

  .modal-footer {
    padding: 0 20px 20px;
  }

  .line-items-table .col-price { width: auto; }
}

@media (max-width: 640px) {
  .hamburger {
    display: flex;
  }

  .sidebar {
    position: fixed;
    left: -240px;
    top: 0;
    bottom: 0;
    z-index: 50;
    transition: left 0.25s ease;
    height: 100vh;
    padding-top: 70px;
    width: 220px;
  }

  .sidebar.open {
    left: 0;
  }

  .page-header {
    padding: 16px 12px 12px;
  }

  .view-content {
    padding: 0 12px 16px;
  }

  .page-title {
    font-size: 1.25rem;
  }

  .modal {
    width: 98%;
    max-height: 95vh;
  }

  .modal-header {
    padding: 16px 16px 0;
  }

  .modal-body {
    padding: 12px 16px 0;
  }

  .modal-total {
    padding: 12px 16px;
    font-size: 1rem;
  }

  .modal-footer {
    padding: 0 16px 16px;
    gap: 8px;
  }

  .toolbar {
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
  }

  .search-wrap {
    max-width: none;
  }

  .btn-group {
    flex-wrap: wrap;
  }

  .clients-grid {
    grid-template-columns: 1fr;
  }
}

.clients-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 16px;
}

.clients-grid .template-card {
  margin-bottom: 0;
}

.clients-field {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin-top: 6px;
  line-height: 1.4;
}

.clients-label {
  font-weight: 600;
  color: var(--color-text-primary);
  display: inline-block;
  min-width: 56px;
  margin-right: 6px;
}

.search-wrap {
  flex: 1;
  max-width: 360px;
}

.search-wrap .form-input {
  margin-bottom: 0;
}

.sortable {
  cursor: pointer;
  user-select: none;
  white-space: nowrap;
}

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

.er-row {
  display: flex;
  gap: 8px;
  align-items: center;
  margin-bottom: 8px;
}

.er-row .er-currency {
  flex: 1;
}

.er-row .er-rate {
  width: 120px;
}

.settings-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.settings-grid .card {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.settings-grid + .settings-grid .card {
  min-height: 300px;
}

.settings-grid + .settings-grid #tax-rates-list,
.settings-grid + .settings-grid #terms-list,
.settings-grid + .settings-grid #payment-methods-list,
.settings-grid + .settings-grid #currencies-list,
.settings-grid + .settings-grid #exchange-rates-list,
.settings-grid + .settings-grid #products-list,
.settings-grid + .settings-grid #services-list {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  max-height: 212px;
}

.settings-grid + .settings-grid #tax-rates-list > div,
.settings-grid + .settings-grid #terms-list > div,
.settings-grid + .settings-grid #payment-methods-list > div,
.settings-grid + .settings-grid #currencies-list > div,
.settings-grid + .settings-grid #exchange-rates-list > div,
.settings-grid + .settings-grid #products-list > div,
.settings-grid + .settings-grid #services-list > div {
  height: 100%;
}

.settings-grid + .settings-grid #tax-rates-list thead th,
.settings-grid + .settings-grid #terms-list thead th,
.settings-grid + .settings-grid #payment-methods-list thead th,
.settings-grid + .settings-grid #currencies-list thead th,
.settings-grid + .settings-grid #exchange-rates-list thead th,
.settings-grid + .settings-grid #products-list thead th,
.settings-grid + .settings-grid #services-list thead th {
  position: sticky;
  top: 0;
  z-index: 1;
  background: var(--color-surface);
}

@media (max-width: 1024px) {
  .settings-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .settings-grid {
    grid-template-columns: 1fr;
  }
}

/* Toasts */
.toast-container {
  position: fixed;
  top: 16px;
  right: 16px;
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-width: 320px;
}
.toast {
  padding: 10px 14px;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  color: #fff;
  box-shadow: var(--shadow-md);
  opacity: 1;
  transition: opacity 0.3s ease;
}
.toast-success { background: var(--color-success); }
.toast-error { background: var(--color-danger); }
.toast-info { background: var(--color-primary); }
.toast-hide { opacity: 0; }

/* Data table */
.dt-toolbar { display: flex; gap: 8px; align-items: center; margin-bottom: 12px; }
.dt-search { flex: 1; }
.dt-wrap { overflow: auto; }
.dt { width: 100%; border-collapse: collapse; }
.dt-th {
  text-align: left;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 6px 8px 6px 0;
  border-bottom: 2px solid var(--color-border);
  white-space: nowrap;
}
.dt-actions-col { width: 1%; }
.dt-td { padding: 8px 8px 8px 0; border-bottom: 1px solid var(--color-border); font-size: 0.875rem; }
.dt-actions { text-align: right; white-space: nowrap; }
.dt-input { width: 100%; min-width: 90px; }
.dt-empty-cell { text-align: center; }
.dt-empty { padding: 24px; font-size: 0.875rem; color: var(--color-text-secondary); }
.dt-footer { display: flex; justify-content: space-between; align-items: center; padding-top: 12px; font-size: 0.8125rem; color: var(--color-text-secondary); }
.dt-pager { display: flex; align-items: center; gap: 8px; }
.dt-page { font-size: 0.8125rem; }

/* Tabs */
.tabs { display: flex; gap: 4px; border-bottom: 2px solid var(--color-border); margin-bottom: 20px; }
.tab {
  padding: 10px 16px;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  cursor: pointer;
}
.tab:hover { color: var(--color-text); }
.tab-active { color: var(--color-primary); border-bottom-color: var(--color-primary); }

.tab-panel {
  padding: 16px 0;
  min-height: 200px;
}

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: none;
  background: var(--color-surface);
  border-radius: var(--radius-md);
  color: var(--color-text);
  cursor: pointer;
  border: 1px solid var(--color-border);
  transition: background 0.15s, color 0.15s;
}
.theme-toggle:hover {
  background: var(--color-bg);
}
.theme-toggle:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Icon visibility */
.icon-sun { display: none; }
.icon-moon { display: block; }
[data-theme="dark"] .icon-sun { display: block; }
[data-theme="dark"] .icon-moon { display: none; }

.theme-toggle svg {
  pointer-events: none;
}

@media print {
  [data-theme="dark"] {
    --color-bg: #ffffff;
    --color-surface: #ffffff;
    --color-border: #e2e6ed;
    --color-text: #1a1d23;
    --color-text-secondary: #6b7280;
    --color-primary: #2563eb;
    --color-primary-light: #dbeafe;
    --color-success: #16a34a;
    --color-success-bg: #dcfce7;
    --color-warning: #d97706;
    --color-warning-bg: #fef3c7;
    --color-danger: #dc2626;
    --color-danger-bg: #fee2e2;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.06);
  }
  .theme-toggle { display: none; }
}