:root {
  color-scheme: light;

  --color-bg: #F6F6F3;
  --color-surface: #FFFFFF;
  --color-text: #1F2933;
  --color-text-muted: #52606D;
  --color-primary: #0B6464;
  --color-primary-text: #FFFFFF;
  --color-border: #7B8794;
  --color-danger: #B42318;
  --color-success: #1B6E3C;
  --color-warning: #855400;
  --color-focus: #1D4ED8;
  --color-primary-hover: #095252;
  --color-primary-active: #074242;
  --color-danger-hover: #962018;
  --color-danger-active: #7A1A14;
  --color-surface-hover: #EDEFEC;
  --color-surface-active: #E1E4E1;
  --color-info-bg: #E3F1F0;
  --color-success-bg: #E5F3E9;
  --color-warning-bg: #FBF0D9;
  --color-danger-bg: #FCEAE7;
  --color-backdrop: rgba(31, 41, 51, 0.5);

  --font-sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --weight-normal: 400;
  --weight-bold: 600;
  --leading-body: 1.5;
  --leading-heading: 1.25;

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 48px;
  --space-8: 64px;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --shadow-sm: 0 1px 2px rgba(31, 41, 51, 0.12);
  --shadow-md: 0 8px 24px rgba(31, 41, 51, 0.18);
  --control-height: 2.75rem;
  --row-height: 2.75rem;
  --row-height-touch: 3rem;
  --icon-size: 1.25rem;
  --width-page: 72rem;
  --width-form: 40rem;
  --width-dialog: 28rem;
  --border-width: 1px;
  --focus-width: 2px;
  --focus-offset: 2px;
  --press-offset: 1px;
  --enter-offset: 0.25rem;

  --duration-fast: 120ms;
  --duration-base: 200ms;
  --easing: ease-out;
}

@media (prefers-reduced-motion: reduce) {
  :root {
    --duration-fast: 0ms;
    --duration-base: 0ms;
  }
}

*, *::before, *::after { box-sizing: border-box; }

[hidden] { display: none !important; }

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--leading-body);
}

h1, h2, h3 { font-weight: var(--weight-bold); line-height: var(--leading-heading); margin: 0; }
h1 { font-size: var(--text-2xl); overflow-wrap: anywhere; }
h2 { font-size: var(--text-xl); }
h3 { font-size: var(--text-lg); }
p { margin: 0; }

:focus-visible {
  outline: var(--focus-width) solid var(--color-focus);
  outline-offset: var(--focus-offset);
}

.visually-hidden {
  position: absolute;
  width: var(--border-width);
  height: var(--border-width);
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

/* App frame */
.app-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2) var(--space-5);
  max-width: var(--width-page);
  margin: 0 auto;
  padding: var(--space-3) var(--space-4) 0;
  border-bottom: var(--border-width) solid var(--color-border);
}

.app-name {
  font-size: var(--text-lg);
  font-weight: var(--weight-bold);
}

.main-nav {
  display: flex;
  flex: 1 1 100%;
}

.main-nav a {
  display: flex;
  flex: 1;
  align-items: center;
  justify-content: center;
  height: var(--control-height);
  padding: 0 var(--space-4);
  border-bottom: var(--focus-width) solid transparent;
  color: var(--color-text);
  text-decoration: none;
}

.main-nav a:hover { background: var(--color-surface-hover); }

.main-nav a[aria-current="page"] {
  font-weight: var(--weight-bold);
  border-bottom-color: var(--color-primary);
}

.page {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
  max-width: var(--width-page);
  margin: 0 auto;
  padding: var(--space-5) var(--space-4);
}

.page > .app-name { display: block; }

@media (min-width: 64rem) {
  .app-header { padding: var(--space-3) var(--space-6) 0; }
  .main-nav { flex: none; }
  .main-nav a { flex: none; }
  .page { padding: var(--space-5) var(--space-6); }
}

/* Button */
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: var(--control-height);
  padding: 0 var(--space-4);
  border: var(--border-width) solid transparent;
  border-radius: var(--radius-sm);
  font: inherit;
  font-weight: var(--weight-bold);
  text-decoration: none;
  cursor: pointer;
  width: 100%;
}

.button { transition: transform var(--duration-fast) var(--easing); }
.button:active { transform: translateY(var(--press-offset)); }

.button-primary { background: var(--color-primary); color: var(--color-primary-text); }
.button-primary:hover { background: var(--color-primary-hover); }
.button-primary:active { background: var(--color-primary-active); }

.button-secondary { background: var(--color-surface); border-color: var(--color-border); color: var(--color-text); }
.button-secondary:hover { background: var(--color-surface-hover); }
.button-secondary:active { background: var(--color-surface-active); }

.button-destructive { background: var(--color-danger); color: var(--color-primary-text); }
.button-destructive:hover { background: var(--color-danger-hover); }
.button-destructive:active { background: var(--color-danger-active); }

.button-destructive-quiet { background: var(--color-surface); border-color: var(--color-danger); color: var(--color-danger); }
.button-destructive-quiet:hover, .button-destructive-quiet:active { background: var(--color-danger-bg); }

.button-link {
  width: auto;
  background: none;
  border-color: transparent;
  color: var(--color-primary);
  text-decoration: underline;
}
.button-link:hover { color: var(--color-primary-hover); }

.button:disabled,
.button:disabled:hover,
.button:disabled:active {
  background: var(--color-surface-hover);
  border-color: var(--color-border);
  color: var(--color-text-muted);
  cursor: not-allowed;
  transform: none;
  text-decoration: none;
}

.button-row {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

@media (min-width: 64rem) {
  .button { width: auto; }
  .button-row { flex-direction: row; }
}

/* Panel */
.panel {
  padding: var(--space-4);
  background: var(--color-surface);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.panel-form { max-width: var(--width-form); }

@media (min-width: 64rem) {
  .panel { padding: var(--space-5); }
}

/* Banner */
.banner {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  animation: banner-in var(--duration-base) var(--easing);
}

.banner-text { flex: 1 1 14rem; min-width: 0; overflow-wrap: anywhere; }

.banner-info { background: var(--color-info-bg); border-color: var(--color-primary); }
.banner-info .icon { color: var(--color-primary); }
.banner-success { background: var(--color-success-bg); border-color: var(--color-success); }
.banner-success .icon { color: var(--color-success); }
.banner-warning { background: var(--color-warning-bg); border-color: var(--color-warning); }
.banner-warning .icon { color: var(--color-warning); }
.banner-danger { background: var(--color-danger-bg); border-color: var(--color-danger); }
.banner-danger .icon { color: var(--color-danger); }

.icon {
  width: var(--icon-size);
  height: var(--icon-size);
  flex: none;
}

@keyframes banner-in {
  from { opacity: 0; transform: translateY(calc(-1 * var(--enter-offset))); }
  to { opacity: 1; transform: none; }
}

.banner-region:empty { display: none; }

/* Field */
.field { display: flex; flex-direction: column; gap: var(--space-2); }
.field-label { font-weight: var(--weight-bold); }
.field-helper { font-size: var(--text-sm); color: var(--color-text-muted); }
.field-error { font-size: var(--text-sm); color: var(--color-danger); }

input, select, textarea {
  width: 100%;
  height: var(--control-height);
  padding: 0 var(--space-3);
  background: var(--color-surface);
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  font: inherit;
}

form { display: flex; flex-direction: column; gap: var(--space-4); }
.form-pair { display: flex; flex-direction: column; gap: var(--space-4); }

@media (min-width: 64rem) {
  .form-pair { flex-direction: row; }
  .form-pair > .field { flex: 1; }
}

textarea { height: auto; padding: var(--space-2) var(--space-3); }
input:focus:not([readonly]), select:focus, textarea:focus:not([readonly]) { border-color: var(--color-primary); }
[aria-invalid="true"] { border-color: var(--color-danger); }
[readonly] { background: var(--color-bg); }
input.mono { font-family: var(--font-mono); }

.stored-text {
  font-family: var(--font-mono);
  overflow-wrap: anywhere;
  margin-top: var(--space-2);
}

/* Empty state */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-6) var(--space-4);
  text-align: center;
}

/* Table */
table { width: 100%; border-collapse: separate; border-spacing: 0; }
th, td { padding: var(--space-2) var(--space-3); text-align: left; vertical-align: middle; border-bottom: var(--border-width) solid var(--color-border); }
tr { height: var(--row-height); }

thead th {
  background: var(--color-bg);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  font-weight: var(--weight-bold);
}

.cell-number { text-align: right; font-variant-numeric: tabular-nums; overflow-wrap: anywhere; }
.cell-mono { font-family: var(--font-mono); }
tr.row-link { position: relative; }
tr.row-link:hover { background: var(--color-surface-hover); }
tr.row-link a::after { content: ""; position: absolute; inset: 0; }
tr.row-editing { background: var(--color-info-bg); }

/* Dialog */
dialog {
  width: min(var(--width-dialog), 100% - var(--space-5));
  padding: var(--space-5);
  background: var(--color-surface);
  border: 0;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  color: var(--color-text);
  animation: dialog-in var(--duration-base) var(--easing);
}

dialog::backdrop { background: var(--color-backdrop); animation: dialog-in var(--duration-base) var(--easing); }
dialog h2 { margin-bottom: var(--space-3); }
dialog p { overflow-wrap: anywhere; }

.dialog-actions {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-top: var(--space-5);
}

@keyframes dialog-in {
  from { opacity: 0; }
  to { opacity: 1; }
}

@media (min-width: 64rem) {
  .dialog-actions { flex-direction: row; justify-content: flex-end; }
}

/* Customer list */
.title-row { display: flex; flex-direction: column; gap: var(--space-3); }
.title-row .button { width: 100%; }
.search { max-width: var(--width-form); }
.search-count {
  min-height: calc(var(--leading-body) * var(--text-sm));
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}
.panel-table { padding: 0; gap: 0; overflow: clip; }
.cell-muted { color: var(--color-text-muted); }
.row-open { color: var(--color-primary); font-weight: var(--weight-bold); text-decoration: underline; overflow-wrap: anywhere; }
.row-open:hover { color: var(--color-primary-hover); }
.data-note { display: flex; flex-direction: column; align-items: flex-start; gap: var(--space-3); }
.note-text { font-size: var(--text-sm); color: var(--color-text-muted); overflow-wrap: anywhere; }

.table-customers,
.table-customers tbody,
.table-customers tr,
.table-customers td { display: block; }
.table-customers thead {
  position: absolute;
  width: var(--border-width);
  height: var(--border-width);
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}
.table-customers tr { height: auto; min-height: var(--row-height-touch); padding: var(--space-3); border-bottom: var(--border-width) solid var(--color-border); }
.table-customers td { padding: 0; border: 0; overflow-wrap: anywhere; }
.table-customers .cell-email { color: var(--color-text-muted); }

@media (min-width: 64rem) {
  .title-row { flex-direction: row; align-items: center; justify-content: space-between; }
  .title-row .button { width: auto; }
  .data-note { flex-direction: row; align-items: center; justify-content: space-between; }
  .table-customers { display: table; table-layout: fixed; }
  .table-customers thead {
    position: sticky;
    top: 0;
    z-index: 1;
    display: table-header-group;
    width: auto;
    height: auto;
    overflow: visible;
    clip-path: none;
  }
  .table-customers tbody { display: table-row-group; }
  .table-customers tr { display: table-row; height: var(--row-height); min-height: 0; padding: 0; border-bottom: 0; }
  .table-customers td {
    display: table-cell;
    padding: var(--space-2) var(--space-3);
    border-bottom: var(--border-width) solid var(--color-border);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }
  .table-customers .cell-email { color: var(--color-text); }
  .table-customers .cell-email.cell-muted { color: var(--color-text-muted); }
  .table-customers .col-name { width: 40%; }
  .table-customers .col-email { width: 60%; }
  .table-customers .row-open { overflow-wrap: normal; }
  .row-open { font-weight: var(--weight-normal); }
}

/* Customer detail */
.detail-actions { display: flex; flex-direction: column; gap: var(--space-2); }
.detail-actions .button { width: 100%; }
.detail-list { display: grid; grid-template-columns: 1fr; gap: var(--space-3); margin: 0; }
.detail-item { display: flex; flex-direction: column; gap: var(--space-1); min-width: 0; }
.detail-term { font-size: var(--text-sm); font-weight: var(--weight-bold); color: var(--color-text-muted); }
.detail-value { margin: 0; color: var(--color-text); overflow-wrap: anywhere; white-space: pre-wrap; }
.detail-value.cell-muted { color: var(--color-text-muted); }

.table-orders,
.table-orders tbody,
.table-orders td { display: block; }
.table-orders thead {
  position: absolute;
  width: var(--border-width);
  height: var(--border-width);
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}
.table-orders tr {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--space-1) var(--space-3);
  height: auto;
  min-height: var(--row-height-touch);
  padding: var(--space-3);
  border-bottom: var(--border-width) solid var(--color-border);
}
.table-orders td { padding: 0; border: 0; overflow-wrap: anywhere; }
.table-orders .col-number { grid-column: 1; grid-row: 1; }
.table-orders .col-total { grid-column: 2; grid-row: 1; }
.table-orders .col-date { grid-column: 1; grid-row: 2; color: var(--color-text-muted); }

@media (min-width: 64rem) {
  .detail-actions { flex-direction: row; }
  .detail-actions .button { width: auto; }
  .detail-list { grid-template-columns: repeat(3, 1fr); }
  .table-orders { display: table; table-layout: fixed; }
  .table-orders thead {
    position: sticky;
    top: 0;
    z-index: 1;
    display: table-header-group;
    width: auto;
    height: auto;
    overflow: visible;
    clip-path: none;
  }
  .table-orders tbody { display: table-row-group; }
  .table-orders tr { display: table-row; height: var(--row-height); min-height: 0; padding: 0; border-bottom: 0; }
  .table-orders td {
    display: table-cell;
    padding: var(--space-2) var(--space-3);
    border-bottom: var(--border-width) solid var(--color-border);
  }
  .table-orders .col-date { width: 30%; color: var(--color-text); }
  .table-orders .col-number { width: 40%; }
  .table-orders .col-total { width: 30%; text-align: right; }
}

/* Order list */
.table-order-list,
.table-order-list tbody,
.table-order-list td { display: block; }
.table-order-list thead {
  position: absolute;
  width: var(--border-width);
  height: var(--border-width);
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}
.table-order-list tr {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--space-1) var(--space-3);
  height: auto;
  min-height: var(--row-height-touch);
  padding: var(--space-3);
  border-bottom: var(--border-width) solid var(--color-border);
}
.table-order-list td { padding: 0; border: 0; overflow-wrap: anywhere; }
.table-order-list .col-number { grid-column: 1; grid-row: 1; }
.table-order-list .col-total { grid-column: 2; grid-row: 1; }
.table-order-list .col-customer { grid-column: 1 / span 2; grid-row: 2; }
.table-order-list .col-date { grid-column: 1 / span 2; grid-row: 3; color: var(--color-text-muted); }

@media (min-width: 64rem) {
  .table-order-list { display: table; table-layout: fixed; }
  .table-order-list thead {
    position: sticky;
    top: 0;
    z-index: 1;
    display: table-header-group;
    width: auto;
    height: auto;
    overflow: visible;
    clip-path: none;
  }
  .table-order-list tbody { display: table-row-group; }
  .table-order-list tr { display: table-row; height: var(--row-height); min-height: 0; padding: 0; border-bottom: 0; }
  .table-order-list td {
    display: table-cell;
    padding: var(--space-2) var(--space-3);
    border-bottom: var(--border-width) solid var(--color-border);
  }
  .table-order-list .col-number { width: 20%; }
  .table-order-list .col-customer { width: 40%; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
  .table-order-list .col-date { width: 20%; color: var(--color-text); }
  .table-order-list .col-total { width: 20%; text-align: right; }
}

/* Order view */
.text-link { color: var(--color-primary); text-decoration: underline; overflow-wrap: anywhere; }
.text-link:hover { color: var(--color-primary-hover); }

.table-lines,
.table-lines tbody,
.table-lines td { display: block; }
.table-lines thead {
  position: absolute;
  width: var(--border-width);
  height: var(--border-width);
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}
.table-lines tr {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  height: auto;
  min-height: var(--row-height-touch);
  padding: var(--space-3);
  border-bottom: var(--border-width) solid var(--color-border);
}
.table-lines td { padding: 0; border: 0; overflow-wrap: anywhere; }
.table-lines .col-description { font-weight: var(--weight-bold); }
.table-lines td[data-label] { display: flex; justify-content: space-between; gap: var(--space-3); }
.table-lines td[data-label]::before { content: attr(data-label); color: var(--color-text-muted); font-weight: var(--weight-normal); }
.table-lines .col-actions:empty { display: none; }

.row-actions { display: flex; gap: var(--space-2); justify-content: flex-start; }
.row-actions .button { padding: 0 var(--space-2); }

.order-view { display: flex; flex-direction: column; gap: var(--space-5); }
.customer-list { display: flex; flex-direction: column; gap: var(--space-5); }
.customer-detail { display: flex; flex-direction: column; gap: var(--space-5); }

.line-form {
  margin-top: var(--space-4);
  animation: banner-in var(--duration-base) var(--easing);
}

.order-total {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: var(--space-3);
  margin-top: var(--space-4);
}
.order-total-label { font-size: var(--text-lg); font-weight: var(--weight-bold); }
.order-total-amount { font-size: var(--text-xl); font-weight: var(--weight-bold); font-variant-numeric: tabular-nums; }

@media (min-width: 64rem) {
  .table-lines { display: table; table-layout: fixed; }
  .table-lines thead {
    position: sticky;
    top: 0;
    z-index: 1;
    display: table-header-group;
    width: auto;
    height: auto;
    overflow: visible;
    clip-path: none;
  }
  .table-lines tbody { display: table-row-group; }
  .table-lines tr { display: table-row; height: var(--row-height); min-height: 0; padding: 0; border-bottom: 0; }
  .table-lines td {
    display: table-cell;
    padding: var(--space-2) var(--space-3);
    border-bottom: var(--border-width) solid var(--color-border);
  }
  .table-lines td[data-label] { display: table-cell; }
  .table-lines td[data-label]::before { content: none; }
  .table-lines .col-actions:empty { display: table-cell; }
  .table-lines .col-description { width: 30%; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-weight: var(--weight-normal); }
  .table-lines .col-quantity { width: 10%; }
  .table-lines .col-price { width: 18%; }
  .table-lines .col-line-total { width: 20%; }
  .table-lines .col-actions { width: 22%; padding-top: 0; padding-bottom: 0; }
  .order-total { justify-content: flex-end; }
  .row-actions { justify-content: flex-end; }
}