:root {
  --sm-bg: #f8fafc;
  --sm-surface: #ffffff;
  --sm-surface-soft: #f8fafc;
  --sm-ink: #1e293b;
  --sm-muted: #64748b;
  --sm-line: #e2e8f0;
  --sm-primary: #2563eb;
  --sm-primary-dark: #1d4ed8;
  --sm-primary-soft: #eff6ff;
  --sm-submit: #10b981;
  --sm-submit-dark: #059669;
  --sm-warning: #f59e0b;
  --sm-warning-dark: #d97706;
  --sm-warning-soft: #fffbeb;
  --sm-delete: #ef4444;
  --sm-delete-dark: #dc2626;
  --sm-shadow: 0 18px 42px rgba(30, 41, 59, 0.08);
}

body {
  background: var(--sm-bg);
  color: var(--sm-ink);
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

a {
  color: var(--sm-primary);
  font-weight: 600;
}

a:hover {
  color: var(--sm-primary-dark);
}

.page-shell {
  max-width: 1220px;
  padding: 30px 24px 52px;
}

.app-topbar {
  align-items: center;
  background: var(--sm-primary);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: 0 8px 30px rgba(37, 99, 235, 0.18);
  display: flex;
  height: 66px;
  justify-content: center;
  position: sticky;
  top: 0;
  z-index: 20;
}

.app-brand {
  color: #ffffff;
  font-size: 1.55rem;
  font-weight: 800;
  letter-spacing: 0;
  position: absolute;
  text-decoration: none;
}

.app-brand:hover {
  color: #ffffff;
}

.topbar-action {
  margin-left: auto;
  margin-right: 20px;
  z-index: 1;
}

.topbar-action .btn {
  border-color: rgba(255, 255, 255, 0.45);
  color: #ffffff;
}

.topbar-action .btn:hover {
  background: #ffffff;
  color: var(--sm-primary);
}

.app-layout {
  display: flex;
  min-height: calc(100vh - 66px);
}

.app-sidebar {
  background: #ffffff;
  border-right: 1px solid var(--sm-line);
  box-shadow: 8px 0 28px rgba(30, 41, 59, 0.04);
  flex: 0 0 220px;
  min-height: calc(100vh - 66px);
  padding: 30px 16px;
  position: sticky;
  top: 66px;
}

.side-link {
  border-radius: 8px;
  color: #475569;
  display: block;
  font-weight: 700;
  margin-bottom: 10px;
  padding: 11px 13px;
  text-decoration: none;
}

.side-link:hover {
  background: var(--sm-primary-soft);
  color: var(--sm-primary);
}

.page-header,
.section-title,
.action-row,
.filter-bar {
  align-items: center;
  display: flex;
  gap: 12px;
  justify-content: space-between;
  margin-bottom: 18px;
}

.page-header h1 {
  color: var(--sm-ink);
  font-weight: 800;
}

.text-secondary {
  color: var(--sm-muted) !important;
}

.action-row,
.filter-bar {
  flex-wrap: wrap;
  justify-content: flex-start;
}

.btn {
  border-radius: 8px;
  font-weight: 700;
}

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

.btn-primary:hover,
.btn-primary:focus {
  background: var(--sm-primary-dark);
  border-color: var(--sm-primary-dark);
}

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

.btn-success:hover,
.btn-success:focus {
  background: var(--sm-submit-dark);
  border-color: var(--sm-submit-dark);
  color: #ffffff;
}

.btn-outline-secondary {
  border-color: #cbd5e1;
  color: #475569;
}

.btn-outline-secondary:hover,
.btn-outline-secondary:focus {
  background: var(--sm-ink);
  border-color: var(--sm-ink);
  color: #ffffff;
}

.btn-outline-primary {
  border-color: var(--sm-primary);
  color: var(--sm-primary);
}

.btn-outline-primary:hover,
.btn-outline-primary:focus {
  background: var(--sm-primary);
  border-color: var(--sm-primary);
  color: #ffffff;
}

.btn-outline-danger {
  border-color: #fecaca;
  color: var(--sm-delete);
}

.btn-outline-danger:hover,
.btn-outline-danger:focus {
  background: var(--sm-delete);
  border-color: var(--sm-delete);
  color: #ffffff;
}

.filter-bar {
  background: rgba(255, 255, 255, 0.82);
  border: 1px solid var(--sm-line);
  border-radius: 8px;
  box-shadow: var(--sm-shadow);
  padding: 14px;
}

.filter-bar .form-control,
.filter-bar .form-select {
  max-width: 210px;
}

.form-control,
.form-select {
  border-color: #cbd5e1;
  border-radius: 8px;
}

.form-control:focus,
.form-select:focus {
  border-color: var(--sm-primary);
  box-shadow: 0 0 0 0.2rem rgba(37, 99, 235, 0.12);
}

.metric-grid,
.content-grid {
  display: grid;
  gap: 18px;
  margin-bottom: 24px;
}

.metric-grid {
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
}

.content-grid {
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
}

.metric-card,
.content-grid > section,
.form-panel,
.narrow-panel,
.note-block,
.detail-list {
  background: var(--sm-surface);
  border: 1px solid var(--sm-line);
  border-radius: 8px;
  box-shadow: var(--sm-shadow);
}

.metric-card,
.content-grid > section,
.form-panel,
.narrow-panel,
.note-block {
  padding: 20px;
}

.metric-card {
  border-top: 4px solid var(--sm-primary);
}

.metric-card span {
  color: var(--sm-muted);
  display: block;
  font-size: 0.88rem;
  font-weight: 700;
}

.metric-card strong {
  color: var(--sm-ink);
  display: block;
  font-size: 1.75rem;
  font-weight: 800;
  margin-top: 7px;
}

.section-title {
  border-bottom: 1px solid #e2e8f0;
  padding-bottom: 10px;
}

.section-title h2 {
  color: var(--sm-ink);
  font-weight: 800;
  margin-bottom: 0;
}

.calculation-summary {
  background: var(--sm-surface-soft);
  border: 1px solid var(--sm-line);
  border-radius: 8px;
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  margin-bottom: 18px;
  padding: 14px;
}

.calculation-summary > div {
  background: #ffffff;
  border: 1px solid #e2e8f0;
  border-radius: 8px;
  padding: 12px;
}

.calculation-summary span {
  color: var(--sm-muted);
  display: block;
  font-size: 0.85rem;
  font-weight: 700;
}

.calculation-summary strong {
  color: var(--sm-ink);
  display: block;
  font-size: 1.25rem;
  margin-top: 4px;
}

.calculation-warning {
  background: var(--sm-warning-soft);
  border: 1px solid #fcd34d;
  border-radius: 8px;
  color: #92400e;
  margin-bottom: 18px;
  padding: 10px 12px;
}

.narrow-panel {
  margin: 64px auto 0;
  max-width: 480px;
}

.form-panel {
  max-width: 720px;
}

.form-panel.wide {
  max-width: 960px;
}

.stacked-form {
  display: grid;
  gap: 14px;
}

.form-grid {
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.form-label {
  color: #334155;
  font-weight: 700;
}

.span-2 {
  grid-column: 1 / -1;
}

.detail-list {
  display: grid;
  grid-template-columns: 180px 1fr;
  margin: 0;
  padding: 18px;
}

.detail-list dt,
.detail-list dd {
  border-bottom: 1px solid #e2e8f0;
  margin: 0;
  padding: 10px 0;
}

.detail-list dt {
  color: var(--sm-muted);
  font-weight: 800;
}

.table-responsive {
  border-radius: 8px;
}

.table {
  background: var(--sm-surface);
  margin-bottom: 0;
}

.table thead th {
  background: var(--sm-primary-soft);
  color: var(--sm-ink);
  font-size: 0.82rem;
  letter-spacing: 0;
  text-transform: uppercase;
}

.table tbody tr:hover {
  background: #f1f5f9;
}

.table td,
.table th {
  border-color: #e2e8f0;
  vertical-align: middle;
}

.alert {
  border-radius: 8px;
  box-shadow: var(--sm-shadow);
}

.errorlist {
  color: var(--sm-delete);
  margin-bottom: 0;
}

.invoice-preview-body,
.pdf-preview-body {
  background: var(--sm-surface-soft);
  min-height: 70vh;
  padding: 0;
}

.invoice-preview-body iframe,
.pdf-preview-body iframe {
  border: 0;
  display: block;
  height: 70vh;
  width: 100%;
}

.modal-content {
  border: 0;
  border-radius: 8px;
  box-shadow: 0 24px 70px rgba(30, 41, 59, 0.22);
}

.modal-header {
  background: var(--sm-primary);
  color: #ffffff;
}

.modal-header .btn-close {
  filter: invert(1);
}

@media (max-width: 720px) {
  .page-shell {
    padding: 22px 14px 42px;
  }

  .page-header {
    align-items: flex-start;
    flex-direction: column;
  }

  .filter-bar .form-control,
  .filter-bar .form-select {
    max-width: none;
    width: 100%;
  }

  .detail-list {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 991.98px) {
  .app-topbar {
    height: 58px;
  }

  .app-brand {
    font-size: 1.25rem;
  }

  .app-layout {
    display: block;
  }

  .app-sidebar {
    border-bottom: 1px solid var(--sm-line);
    border-right: 0;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    min-height: auto;
    padding: 12px;
    position: static;
  }

  .side-link {
    margin-bottom: 0;
  }
}