:root {
  color-scheme: light;
  --color-background: #f4f7fb;
  --color-surface: #ffffff;
  --color-surface-subtle: #fbfcfe;
  --color-surface-muted: #f4f8fc;
  --color-ink: #0f172a;
  --color-muted: #526174;
  --color-subtle: #e5eaf1;
  --color-border: #c8d2df;
  --color-border-strong: #9dafc5;
  --color-primary: #1e3a5f;
  --color-primary-hover: #162f50;
  --color-accent: #047857;
  --color-accent-soft: #e8f6f0;
  --color-danger: #b42318;
  --color-danger-soft: #fff1f0;
  --color-danger-border: #f0bbb7;
  --color-placeholder: #79879a;
  --color-focus: #2563eb;
  --color-focus-soft: rgba(37, 99, 235, 0.16);
  --color-on-primary: #ffffff;
  --color-on-accent: #064e3b;
  --color-note: #607083;
  --shadow-card: 0 16px 36px rgba(30, 58, 95, 0.08), 0 2px 8px rgba(15, 23, 42, 0.04);
  --radius-card: 20px;
  --radius-control: 10px;
  --font-sans: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Tahoma, Arial, sans-serif;
}

[data-theme="dark"] {
  color-scheme: dark;
  --color-background: #101827;
  --color-surface: #172235;
  --color-surface-subtle: #1d2a3d;
  --color-surface-muted: #202f44;
  --color-ink: #f1f5f9;
  --color-muted: #b4c0d0;
  --color-subtle: #30415a;
  --color-border: #465978;
  --color-border-strong: #7085a5;
  --color-primary: #a9c9ee;
  --color-primary-hover: #d4e7fb;
  --color-accent: #58c49e;
  --color-accent-soft: #173d36;
  --color-danger: #ff9b92;
  --color-danger-soft: #4b272b;
  --color-danger-border: #a95c62;
  --color-placeholder: #aab8cb;
  --color-focus: #8bbdff;
  --color-focus-soft: rgba(139, 189, 255, 0.28);
  --color-on-primary: #10223b;
  --color-on-accent: #b9f3de;
  --color-note: #b4c0d0;
  --shadow-card: 0 18px 42px rgba(0, 0, 0, 0.32), 0 2px 8px rgba(0, 0, 0, 0.2);
}

* { box-sizing: border-box; }

html {
  overflow-x: hidden;
  scroll-behavior: smooth;
}

body {
  min-width: 320px;
  overflow-x: hidden;
  margin: 0;
  background: var(--color-background);
  color: var(--color-ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.5;
}

button,
input,
select,
textarea { font: inherit; }

button { cursor: pointer; }

button:disabled { cursor: not-allowed; }

.skip-link {
  position: fixed;
  z-index: 10;
  inset-block-start: 12px;
  inset-inline-start: 12px;
  padding: 10px 14px;
  border-radius: 8px;
  background: var(--color-ink);
  color: var(--color-surface);
  transform: translateY(-150%);
}

.skip-link:focus { transform: translateY(0); }

.app-shell {
  width: min(1480px, calc(100% - 40px));
  margin: 0 auto;
  padding: 44px 0 56px;
}

.page-header,
.section-heading,
.items-heading,
.preview-label-row,
.action-row,
.invoice-header,
.invoice-brand,
.invoice-footer-grid,
.invoice-details-grid { display: flex; }

.page-header {
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 28px;
}

.header-tools {
  display: grid;
  justify-items: end;
  gap: 10px;
}

.preference-controls,
.language-switch {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.preference-controls { justify-content: end; }

.preference-button {
  min-height: 40px;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  padding: 8px 12px;
  background: var(--color-surface);
  color: var(--color-primary);
  font-size: 0.813rem;
  font-weight: 800;
}

.preference-button[aria-pressed="true"] {
  border-color: var(--color-primary);
  background: var(--color-primary);
  color: var(--color-on-primary);
}

.preference-button:hover { border-color: var(--color-primary); }

.theme-toggle { white-space: nowrap; }

.eyebrow {
  margin: 0 0 6px;
  color: var(--color-primary);
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1, h2, p { margin-top: 0; }

h1 {
  margin-bottom: 8px;
  font-size: clamp(2rem, 4vw, 3.125rem);
  line-height: 1.1;
  letter-spacing: -0.04em;
}

h2 {
  margin-bottom: 0;
  font-size: 1.25rem;
  line-height: 1.25;
  letter-spacing: -0.02em;
}

.page-intro,
.privacy-note,
.preview-hint,
.field-help,
.app-status { color: var(--color-muted); }

.page-intro { margin-bottom: 0; }

.privacy-note {
  margin: 0;
  padding: 8px 12px;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  background: var(--color-surface);
  font-size: 0.875rem;
  white-space: nowrap;
}

.workspace {
  display: grid;
  grid-template-columns: minmax(420px, 0.92fr) minmax(510px, 1.08fr);
  align-items: start;
  gap: 28px;
}

.form-card,
.invoice-paper {
  border: 1px solid var(--color-subtle);
  border-radius: var(--radius-card);
  background: var(--color-surface);
  box-shadow: var(--shadow-card);
}

.form-card { padding: clamp(20px, 3vw, 36px); }

.section-heading {
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--color-subtle);
}

.autosave-label,
.item-count {
  padding: 5px 9px;
  border-radius: 999px;
  background: var(--color-surface-muted);
  color: var(--color-primary);
  font-size: 0.75rem;
  font-weight: 700;
  white-space: nowrap;
}

form { margin-top: 24px; }

fieldset {
  min-width: 0;
  margin: 0;
  padding: 0 0 28px;
  border: 0;
}

fieldset + fieldset {
  padding-top: 26px;
  border-top: 1px solid var(--color-subtle);
}

legend {
  padding: 0;
  color: var(--color-ink);
  font-weight: 800;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-top: 16px;
}

.field { min-width: 0; }

.field-full { grid-column: 1 / -1; }

label {
  display: block;
  margin-bottom: 7px;
  color: var(--color-ink);
  font-size: 0.875rem;
  font-weight: 700;
}

input,
select,
textarea {
  width: 100%;
  min-height: 44px;
  padding: 10px 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-control);
  background: var(--color-surface);
  color: var(--color-ink);
  outline: none;
  transition: border-color 180ms ease, box-shadow 180ms ease, background-color 180ms ease;
}

textarea { resize: vertical; }

input::placeholder,
textarea::placeholder { color: var(--color-placeholder); }

select { color: var(--color-ink); }

input:hover,
select:hover,
textarea:hover { border-color: var(--color-border-strong); }

input:focus,
select:focus,
textarea:focus,
button:focus-visible,
.skip-link:focus {
  outline: 3px solid var(--color-focus-soft);
  outline-offset: 2px;
}

input:focus,
select:focus,
textarea:focus {
  border-color: var(--color-focus);
  box-shadow: 0 0 0 3px var(--color-focus-soft);
}

.client-action-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 12px;
}

.client-action-row .button { flex: 1 1 180px; }

.saved-products-panel[hidden] { display: none; }

.saved-products-panel { padding-bottom: 28px; }

.saved-products-panel > legend { margin-bottom: 6px; }

.product-eyebrow { margin: 0 0 16px; }

.saved-product-rows { display: grid; gap: 10px; }

.load-client-products-button { justify-self: start; }

.saved-product-row {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(126px, 0.75fr) auto auto;
  gap: 10px;
  align-items: end;
  padding: 12px;
  border: 1px solid var(--color-subtle);
  border-radius: 14px;
  background: var(--color-surface-subtle);
}

.product-create-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(150px, 0.75fr) auto;
  gap: 12px;
  align-items: end;
  margin-top: 16px;
  padding: 16px;
  border-radius: 14px;
  background: var(--color-surface-muted);
}

.product-create-grid .field { margin: 0; }

.product-add-button,
.product-delete-button { white-space: nowrap; }

.items-fieldset { padding-bottom: 24px; }

.items-heading {
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.field-help {
  margin: 7px 0 16px;
  font-size: 0.813rem;
}

.items-form-header,
.item-row {
  display: grid;
  grid-template-columns: minmax(0, 1.7fr) 74px minmax(112px, 1fr) minmax(104px, 1fr) 42px;
  gap: 10px;
  align-items: end;
}

.items-form-header {
  padding: 0 4px 8px;
  color: var(--color-muted);
  font-size: 0.688rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.item-rows { display: grid; gap: 10px; }

.item-row {
  padding: 12px;
  border: 1px solid var(--color-subtle);
  border-radius: 14px;
  background: var(--color-surface-subtle);
}

.item-row .item-input { min-width: 0; }

.item-row input { min-height: 42px; }

.line-total {
  display: flex;
  min-height: 42px;
  align-items: center;
  justify-content: flex-end;
  padding: 0 4px;
  color: var(--color-ink);
  font-feature-settings: "tnum" 1;
  font-variant-numeric: tabular-nums;
  font-size: 0.875rem;
  font-weight: 800;
  white-space: nowrap;
}

.remove-item-button {
  width: 44px;
  min-width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid var(--color-danger-border);
  border-radius: var(--radius-control);
  background: var(--color-surface);
  color: var(--color-danger);
  font-size: 1.25rem;
  line-height: 1;
}

.remove-item-button:hover { background: var(--color-danger-soft); }

.button {
  min-height: 44px;
  border: 1px solid transparent;
  border-radius: var(--radius-control);
  padding: 10px 15px;
  font-weight: 800;
  transition: background-color 180ms ease, border-color 180ms ease, color 180ms ease, transform 180ms ease;
}

.button:hover:not(:disabled) { transform: translateY(-1px); }

.button:active:not(:disabled) { transform: translateY(0); }

.button:disabled {
  opacity: 0.55;
  transform: none;
}

.button-primary {
  background: var(--color-primary);
  color: var(--color-on-primary);
}

.button-primary:hover:not(:disabled) { background: var(--color-primary-hover); }

.button-secondary {
  border-color: var(--color-border);
  background: var(--color-surface);
  color: var(--color-primary);
}

.button-secondary:hover:not(:disabled) { border-color: var(--color-primary); background: var(--color-surface-muted); }

.button-danger {
  border-color: var(--color-danger-border);
  background: var(--color-surface);
  color: var(--color-danger);
}

.button-danger:hover:not(:disabled) { background: var(--color-danger-soft); }

.add-item-button { margin-top: 14px; }

.action-row {
  flex-wrap: wrap;
  gap: 10px;
  padding-top: 4px;
}

.action-row .button-primary { margin-inline-start: auto; }

.app-status {
  min-height: 1.5em;
  margin: 13px 0 0;
  font-size: 0.813rem;
}

.preview-area { min-width: 0; }

.preview-label-row {
  align-items: center;
  justify-content: space-between;
  margin: 4px 4px 12px;
}

.preview-label-row .eyebrow,
.preview-hint { margin-bottom: 0; }

.preview-hint { font-size: 0.813rem; }

.invoice-paper { overflow: hidden; }

.invoice-header {
  align-items: flex-start;
  justify-content: space-between;
  gap: 24px;
  padding: clamp(24px, 4vw, 44px) clamp(24px, 4vw, 48px) 30px;
  border-bottom: 1px solid var(--color-subtle);
}

.invoice-brand { min-width: 0; align-items: flex-start; gap: 14px; }

.brand-mark {
  display: grid;
  width: 42px;
  min-width: 42px;
  height: 42px;
  place-items: center;
  border-radius: 12px;
  background: var(--color-primary);
  color: var(--color-on-primary);
  font-size: 0.75rem;
  font-weight: 900;
  letter-spacing: -0.04em;
}

.invoice-business-name,
.contact-name {
  margin-bottom: 3px;
  color: var(--color-ink);
  font-weight: 800;
  overflow-wrap: anywhere;
}

.invoice-address,
.invoice-contact-block p:not(.invoice-section-label) {
  margin-bottom: 2px;
  overflow-wrap: anywhere;
}

.invoice-address { color: var(--color-muted); font-size: 0.875rem; }

.invoice-title-block { text-align: end; }

.invoice-title-block h2 {
  margin: 0 0 13px;
  color: var(--color-primary);
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  letter-spacing: -0.045em;
  text-transform: uppercase;
}

.invoice-meta { display: grid; gap: 4px; margin: 0; }

.invoice-meta div,
.totals-list div {
  display: flex;
  justify-content: space-between;
  gap: 24px;
}

.invoice-meta dt,
.invoice-meta dd { margin: 0; font-size: 0.813rem; }

.invoice-meta dt { color: var(--color-muted); }

.invoice-meta dd { color: var(--color-ink); font-weight: 800; font-variant-numeric: tabular-nums; }

.invoice-details-grid {
  justify-content: space-between;
  gap: 40px;
  padding: 28px clamp(24px, 4vw, 48px);
}

.invoice-contact-block { width: min(50%, 285px); }

.invoice-section-label {
  margin-bottom: 7px;
  color: var(--color-primary);
  font-size: 0.688rem;
  font-weight: 900;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}

.invoice-contact-block p:not(.invoice-section-label) { color: var(--color-muted); font-size: 0.875rem; }

.placeholder-text { color: var(--color-placeholder) !important; font-style: italic; font-weight: 500 !important; }

.invoice-table-wrap { overflow-x: auto; padding: 0 clamp(24px, 4vw, 48px); }

.invoice-table {
  width: 100%;
  min-width: 490px;
  border-collapse: collapse;
  table-layout: fixed;
}

.invoice-table th,
.invoice-table td { padding: 13px 12px; border-bottom: 1px solid var(--color-subtle); text-align: left; }

.invoice-table th {
  background: #f3f7fb;
  color: var(--color-primary);
  font-size: 0.688rem;
  font-weight: 900;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.invoice-table th:first-child { border-radius: 8px 0 0 8px; }
.invoice-table th:last-child { border-radius: 0 8px 8px 0; }

.invoice-table th:first-child,
.invoice-table td:first-child { width: 46%; }

.invoice-table td { color: #26364b; font-size: 0.875rem; overflow-wrap: anywhere; }

.invoice-table .numeric-cell { text-align: right; }

.invoice-table .numeric-cell,
.totals-list dd {
  font-feature-settings: "tnum" 1;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.empty-item-row td { color: var(--color-placeholder); font-style: italic; }

.invoice-footer-grid {
  align-items: flex-start;
  justify-content: space-between;
  gap: 24px;
  padding: 28px clamp(24px, 4vw, 48px) 34px;
}

.invoice-thanks { margin: 4px 0 0; color: var(--color-muted); font-size: 0.875rem; }

.totals-list { width: min(100%, 300px); margin: 0; }

.totals-list div { padding: 8px 0; }

.totals-list dt,
.totals-list dd { margin: 0; font-size: 0.875rem; }

.totals-list dt { color: var(--color-muted); }
.totals-list dt span { color: var(--color-muted); }
.totals-list dd { font-weight: 800; }

.totals-list .grand-total {
  margin-top: 5px;
  padding: 13px 14px;
  border-radius: 12px;
  background: var(--color-accent-soft);
  color: #064e3b;
}

.grand-total dt,
.grand-total dd { color: #064e3b; font-size: 0.938rem; font-weight: 900; }

.invoice-practice-note {
  padding: 15px clamp(24px, 4vw, 48px);
  border-top: 1px solid var(--color-subtle);
  background: #fafbfd;
  color: #607083;
  font-size: 0.75rem;
  line-height: 1.45;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (max-width: 1100px) {
  .workspace { grid-template-columns: minmax(360px, 0.88fr) minmax(450px, 1.12fr); gap: 20px; }
  .items-form-header,
  .item-row { grid-template-columns: minmax(0, 1.45fr) 62px minmax(95px, 1fr) minmax(92px, 1fr) 42px; gap: 8px; }
}

@media (max-width: 860px) {
  .app-shell { width: min(720px, calc(100% - 28px)); padding-top: 28px; }
  .page-header { align-items: flex-start; flex-direction: column; gap: 14px; }
  .header-tools { width: 100%; justify-items: start; }
  .preference-controls { justify-content: start; }
  .workspace { grid-template-columns: minmax(0, 1fr); }
  .preview-area { order: 2; }
}

@media (max-width: 560px) {
  .app-shell { width: min(100% - 24px, 520px); padding-bottom: 32px; }
  .form-card { padding: 20px 16px; }
  .section-heading { padding-bottom: 20px; }
  .form-grid { grid-template-columns: 1fr; }
  .field-full { grid-column: auto; }
  .items-form-header { display: none; }
  .saved-product-row,
  .product-create-grid { grid-template-columns: 1fr; }
  .saved-product-row .button,
  .product-create-grid .button,
  .load-client-products-button { width: 100%; }
  .item-row { grid-template-columns: 1fr 1fr; gap: 10px; }
  .item-row .description-input { grid-column: 1 / -1; }
  .item-row .line-total { justify-content: flex-start; padding: 0; }
  .item-row .line-total::before { content: "Total: "; color: var(--color-muted); font-weight: 600; }
  .remove-item-button { justify-self: end; }
  .action-row,
  .client-action-row { flex-direction: column; }
  .action-row .button-primary { margin-left: 0; }
  .action-row .button,
  .client-action-row .button { width: 100%; }
  .invoice-header { flex-direction: column; gap: 24px; }
  .invoice-title-block { text-align: left; }
  .invoice-meta { width: min(100%, 260px); }
  .invoice-details-grid { flex-direction: column; gap: 22px; }
  .invoice-contact-block { width: 100%; }
  .invoice-footer-grid { flex-direction: column; }
  .totals-list { width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; }
}

@media print {
  @page { margin: 12mm; }

  body { min-width: 0; background: #fff; color: #000; }
  .skip-link,
  .page-header,
  .form-card,
  .preview-label-row { display: none !important; }
  .app-shell { width: 100%; margin: 0; padding: 0; }
  .workspace { display: block; }
  .preview-area { display: block; }
  .invoice-paper { border: 0; border-radius: 0; box-shadow: none; }
  .invoice-header { padding-top: 0; }
  .invoice-table-wrap { overflow: visible; }
  .invoice-table { min-width: 0; }
  .invoice-table th { background: #f2f2f2 !important; -webkit-print-color-adjust: exact; print-color-adjust: exact; }
  .grand-total { background: #edf7f1 !important; -webkit-print-color-adjust: exact; print-color-adjust: exact; }
}