:root {
  color-scheme: light;
  --ink: #111827;
  --muted: #6B6258;
  --line: #E6D8C7;
  --line-strong: #CFAE8A;
  --paper: #FFF9EF;
  --paper-soft: #FBF3E7;
  --paper-warm: #E8C9A6;
  --accent: #D89450;
  --accent-dark: #A85F25;
  --danger: #B83232;
  font-family: Arial, Helvetica, sans-serif;
  color: var(--ink);
  background:
    linear-gradient(90deg, rgba(17, 24, 39, 0.025) 1px, transparent 1px),
    linear-gradient(180deg, rgba(17, 24, 39, 0.02) 1px, transparent 1px),
    var(--paper-soft);
  background-size: 28px 28px, 28px 28px, auto;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
}

a {
  color: var(--accent-dark);
  text-underline-offset: 3px;
}

a:hover {
  color: var(--accent);
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible,
main:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
}

header {
  border-bottom: 2px solid var(--ink);
  background: rgba(255, 249, 239, 0.96);
}

nav,
main {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
}

nav {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  flex-wrap: wrap;
}

nav div {
  display: flex;
  align-items: center;
  gap: 6px 18px;
  flex-wrap: wrap;
}

nav div a {
  font-size: 15px;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

nav div a:hover {
  border-bottom-color: var(--ink);
}

main {
  padding: 42px 0 72px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--ink);
}

.brand img {
  display: block;
  width: 174px;
  height: auto;
}

.skip-link {
  position: absolute;
  left: 8px;
  top: -80px;
  background: var(--paper);
  border: 2px solid var(--ink);
  padding: 8px 12px;
  z-index: 10;
}

.skip-link:focus {
  top: 8px;
}

h1,
h2,
h3,
h4 {
  font-family: Georgia, "Times New Roman", serif;
  letter-spacing: 0;
}

h1 {
  max-width: 850px;
  font-size: 48px;
  line-height: 1.04;
  margin: 0 0 20px;
}

h2 {
  margin: 0 0 14px;
  font-size: 27px;
}

h3 {
  margin-bottom: 8px;
}

.hero {
  padding: 56px 0 40px;
  max-width: 820px;
}

.eyebrow {
  margin: 0 0 12px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

.hero p,
p,
li,
dd,
dt,
label,
input,
textarea,
select,
button {
  font-size: 17px;
  line-height: 1.5;
}

.hero > p:not(.eyebrow) {
  max-width: 690px;
  font-size: 20px;
}

.panel,
.book-preview {
  position: relative;
  background: var(--paper);
  border: 1px solid var(--line);
  border-top: 3px solid var(--ink);
  border-radius: 2px;
  box-shadow: 0 12px 30px rgba(17, 24, 39, 0.07);
  padding: 22px;
  margin: 22px 0;
}

.panel::after,
.book-preview::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.22), transparent 38%),
    linear-gradient(90deg, rgba(17, 24, 39, 0.02), transparent 18%);
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 18px;
}

.workspace-hero {
  padding-bottom: 22px;
}

.workspace-layout {
  display: grid;
  grid-template-columns: minmax(280px, 360px) minmax(0, 1fr);
  gap: 24px;
  align-items: start;
}

.workspace-source-panel {
  margin-bottom: 18px;
}

.workspace-sidebar {
  position: sticky;
  top: 18px;
}

.workspace-main,
.workspace-tool,
.workspace-status,
.workspace-actions {
  min-width: 0;
}

.action-list {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
}

.action-list a {
  display: inline-block;
  border: 1px solid var(--line-strong);
  background: var(--paper-soft);
  color: var(--ink);
  padding: 7px 10px;
  text-decoration: none;
  font-weight: 700;
}

.action-list a:hover {
  border-color: var(--accent-dark);
  color: var(--accent-dark);
}

.workspace-tools {
  min-width: 0;
}

.tool-radio {
  position: absolute;
  opacity: 0;
  width: 1px;
  height: 1px;
}

.tool-tab {
  display: inline-block;
  width: fit-content;
  margin: 0 8px 16px 0;
  border: 1px solid var(--line-strong);
  background: var(--paper-soft);
  color: var(--ink);
  padding: 9px 13px;
  font-weight: 700;
  cursor: pointer;
}

.tool-radio:focus-visible + .tool-tab {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
}

.tool-radio:checked + .tool-tab {
  background: var(--accent-dark);
  border-color: var(--accent-dark);
  color: var(--paper);
}

.tool-panel {
  display: none;
  min-width: 0;
}

#tool-preview:checked ~ .tool-panels #tool-panel-preview,
#tool-convert:checked ~ .tool-panels #tool-panel-convert,
#tool-compare:checked ~ .tool-panels #tool-panel-compare,
#tool-create:checked ~ .tool-panels #tool-panel-create {
  display: block;
}

label {
  display: block;
  font-weight: 700;
  margin-top: 16px;
}

input,
textarea,
select {
  width: 100%;
  margin-top: 6px;
  padding: 10px 12px;
  border: 1px solid var(--line-strong);
  border-radius: 2px;
  background: #fffefa;
  color: var(--ink);
}

textarea {
  font-family: Arial, Helvetica, sans-serif;
}

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

.checkbox input {
  width: auto;
  margin-top: 0;
}

button,
.button-link {
  display: inline-block;
  border: 2px solid var(--accent-dark);
  background: var(--accent-dark);
  color: #fffdf6;
  border-radius: 2px;
  padding: 9px 14px;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
}

button:hover,
.button-link:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: #fffdf6;
}

button {
  margin-top: 18px;
}

.preview-layout {
  display: grid;
  grid-template-columns: minmax(280px, 360px) minmax(0, 1fr);
  gap: 24px;
  align-items: start;
}

.preview-sidebar {
  position: sticky;
  top: 18px;
}

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

.convert-workspace {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 24px;
  align-items: start;
}

.convert-pane,
.convert-rendered {
  min-width: 0;
}

.convert-pane textarea {
  min-height: 380px;
}

.convert-previews {
  margin-top: 2px;
}

.mode-toggle {
  margin: 0;
  padding: 0;
  border: 0;
}

.mode-toggle legend {
  margin-bottom: 8px;
  font-weight: 700;
}

.mode-toggle > input[type="radio"] {
  position: absolute;
  opacity: 0;
  width: 1px;
  height: 1px;
}

.mode-toggle > label {
  display: inline-block;
  width: fit-content;
  margin: 0 8px 0 0;
  border: 1px solid var(--line-strong);
  background: var(--paper-soft);
  color: var(--ink);
  padding: 8px 12px;
  font-weight: 700;
  cursor: pointer;
}

.mode-toggle > input[type="radio"]:focus-visible + label {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
}

.mode-toggle > input[type="radio"]:checked + label {
  background: var(--accent-dark);
  border-color: var(--accent-dark);
  color: var(--paper);
}

.mode-panel {
  display: none;
  margin-top: 16px;
}

#mode-isbn:checked ~ .isbn-panel,
#mode-xml:checked ~ .xml-panel {
  display: block;
}

#workspace-source-isbn:checked ~ .workspace-isbn-panel,
#workspace-source-xml:checked ~ .workspace-xml-panel,
#workspace-source-saved:checked ~ .workspace-saved-panel {
  display: block;
}

.inline-form {
  display: inline;
  margin-left: 8px;
}

.inline-form button {
  margin-top: 0;
  padding: 4px 8px;
  border-color: var(--danger);
  background: transparent;
  color: var(--danger);
}

.inline-form button:hover {
  background: var(--danger);
  border-color: var(--danger);
  color: #fffdf6;
}

.notice {
  border-left: 5px solid var(--accent);
  background: #edf5ee;
  padding: 12px 14px;
  box-shadow: inset 0 -1px 0 rgba(31, 37, 33, 0.08);
}

.lookup-notice {
  margin: 8px 0 22px;
  border-left: 4px solid var(--accent-dark);
  background: rgba(255, 249, 239, 0.72);
  padding: 10px 13px;
  color: var(--muted);
}

.lookup-notice strong {
  color: var(--ink);
}

.version-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin: 0 0 14px;
  font-weight: 700;
}

.help {
  color: var(--muted);
  margin-top: 6px;
}

.book-preview {
  display: grid;
  grid-template-columns: minmax(120px, 180px) 1fr;
  gap: 24px;
  align-items: start;
  min-width: 0;
}

.book-preview h2 {
  grid-column: 1 / -1;
  min-width: 0;
  overflow-wrap: break-word;
}

.book-preview img {
  width: 100%;
  height: auto;
  border: 1px solid var(--line);
  box-shadow: 4px 6px 0 var(--paper-warm);
}

dl {
  display: grid;
  grid-template-columns: minmax(140px, max-content) minmax(220px, 1fr);
  gap: 7px 12px;
}

dt {
  font-weight: 700;
  color: var(--muted);
  min-width: 0;
}

dd {
  min-width: 0;
  overflow-wrap: break-word;
  word-break: normal;
}

.book-preview dd {
  overflow-wrap: normal;
}

table {
  width: 100%;
  border-collapse: collapse;
  background: var(--paper);
  border-top: 3px solid var(--ink);
}

th,
td {
  text-align: left;
  border-bottom: 1px solid var(--line);
  padding: 11px 10px;
  vertical-align: top;
}

th {
  color: var(--muted);
  font-size: 14px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.flags strong {
  text-transform: uppercase;
  color: var(--danger);
}

.html-flags .flag-ok strong {
  color: #2f6f4e;
}

.html-flags .flag-info strong {
  color: var(--accent-dark);
}

.html-flags .flag-warning strong,
.html-flags .flag-error strong {
  color: var(--danger);
}

.html-preview {
  max-width: 760px;
  padding: 18px;
  border: 1px solid var(--line);
  background: #fffefa;
  color: var(--ink);
  line-height: 1.6;
}

.html-preview p {
  max-width: none;
  margin: 0 0 14px;
}

.html-preview b,
.html-preview strong {
  font-weight: 700;
}

.html-preview i,
.html-preview em {
  font-style: italic;
}

.compare-grid {
  display: grid;
  grid-template-columns: minmax(220px, 1.1fr) minmax(0, 1fr) minmax(0, 1fr);
  gap: 0;
  border-bottom: 1px solid var(--line);
}

.compare-grid > div {
  min-width: 0;
  padding: 11px 12px;
  overflow-wrap: anywhere;
}

.compare-header {
  border-top: 3px solid var(--ink);
  background: var(--paper-soft);
  color: var(--muted);
  font-weight: 700;
  text-transform: uppercase;
}

.compare-path {
  display: block;
  margin-top: 4px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 400;
}

.compare-changed > div:nth-child(2),
.compare-changed > div:nth-child(3) {
  background: rgba(216, 148, 80, 0.12);
}

.compare-added > div:nth-child(3) {
  background: rgba(47, 111, 78, 0.14);
}

.compare-removed > div:nth-child(2) {
  background: rgba(184, 50, 50, 0.12);
}

.missing-value {
  color: var(--danger);
  font-weight: 700;
}

.collapsible-panel details,
.field-section {
  min-width: 0;
}

.collapsible-panel summary {
  cursor: pointer;
  color: var(--ink);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 24px;
  font-weight: 700;
}

.field-section {
  margin-top: 20px;
  border-top: 1px solid var(--line);
  padding-top: 14px;
}

.tab-radio {
  position: absolute;
  opacity: 0;
  width: 1px;
  height: 1px;
}

.tab-label {
  display: inline-block;
  margin: 12px 8px 12px 0;
  border: 1px solid var(--line-strong);
  background: var(--paper-soft);
  color: var(--ink);
  padding: 8px 12px;
  font-weight: 700;
  cursor: pointer;
}

.version-controls {
  display: inline-flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin: 8px 0 12px;
}

.raw-xml-link {
  display: inline;
  margin: 0 0 12px 6px;
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--accent-dark);
  font: inherit;
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.raw-xml-link:hover {
  background: transparent;
  color: var(--accent);
}

.tab-response-only {
  color: var(--muted);
  background: var(--paper-soft);
}

.tab-unavailable {
  color: var(--muted);
  border-style: dashed;
  opacity: 0.62;
  cursor: default;
}

.tab-radio:focus-visible + .tab-label {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
}

.tab-radio:checked + .tab-label {
  background: var(--accent-dark);
  border-color: var(--accent-dark);
  color: var(--paper);
}

.tab-panels > .onix-version {
  display: none;
}

#tab-preview-2-1:checked ~ .tab-panels #panel-preview-2-1,
#tab-preview-3-0:checked ~ .tab-panels #panel-preview-3-0,
#tab-preview-3-1:checked ~ .tab-panels #panel-preview-3-1,
#tab-workspace-2-1:checked ~ .tab-panels #panel-workspace-2-1,
#tab-workspace-3-0:checked ~ .tab-panels #panel-workspace-3-0,
#tab-workspace-3-1:checked ~ .tab-panels #panel-workspace-3-1 {
  display: block;
}

.onix-version {
  border-top: 1px solid var(--line);
  padding-top: 18px;
  margin-top: 18px;
}

.technical-toggle {
  position: absolute;
  opacity: 0;
  width: 1px;
  height: 1px;
}

.technical-toggle-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  width: fit-content;
  margin: 8px 0 12px 12px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
}

.technical-toggle-label::before {
  content: "";
  width: 16px;
  height: 16px;
  border: 1px solid var(--line-strong);
  background: #fffefa;
}

.technical-toggle:checked + .technical-toggle-label::before {
  background: var(--accent-dark);
  box-shadow: inset 0 0 0 3px #fffefa;
}

.technical-toggle:focus-visible + .technical-toggle-label {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
}

.xml-output {
  max-height: 520px;
  overflow: auto;
  padding: 14px;
  border: 1px solid var(--line);
  background: #fffefa;
  color: var(--ink);
  font-size: 14px;
  line-height: 1.45;
  white-space: pre-wrap;
}

.xml-tree {
  display: grid;
  gap: 10px;
  margin: 14px 0 24px;
  padding-left: 0;
  list-style: none;
}

.xml-tree .xml-tree {
  margin: 10px 0 2px;
  padding-left: 22px;
  border-left: 1px solid rgba(207, 174, 138, 0.55);
}

.xml-tree li {
  min-width: 0;
  padding: 2px 0;
}

.xml-section-node > .xml-name {
  margin-top: 4px;
  font-size: 20px;
}

.xml-section-node .xml-section-node > .xml-name {
  font-size: 18px;
}

.xml-value-node > .xml-name {
  font-weight: 700;
}

.xml-name {
  display: inline-block;
  font-weight: 700;
  color: var(--ink);
  font-size: 17px;
  line-height: 1.28;
}

.xml-label {
  display: inline-block;
  margin-left: 8px;
  color: var(--muted);
  font-size: 14px;
}

.xml-code {
  display: none;
  margin-left: 6px;
  color: var(--muted);
  font-size: 0.78em;
  font-weight: 400;
}

.info-link {
  display: inline-grid;
  place-items: center;
  width: 1.2em;
  height: 1.2em;
  margin-left: 5px;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  color: var(--accent-dark);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 11px;
  font-weight: 700;
  line-height: 1;
  text-decoration: none;
  transform: translateY(-1px);
}

.info-link:hover {
  background: var(--accent-dark);
  color: var(--paper);
}

.xml-value {
  display: block;
  margin-top: 4px;
  color: var(--ink);
  font-size: 17px;
  line-height: 1.42;
  overflow-wrap: anywhere;
}

.xml-code-value {
  display: none;
  margin-left: 6px;
  color: var(--muted);
  font-size: 0.78em;
  font-weight: 400;
}

.code-meaning {
  color: var(--ink);
  font-weight: 400;
}

.value-info-link {
  vertical-align: text-bottom;
}

.code-meaning + .xml-code-value {
  margin-left: 4px;
}

.technical-toggle:checked ~ .field-section .xml-code,
.technical-toggle:checked ~ .field-section .xml-code-value,
.technical-toggle:checked ~ .tab-panels .field-section .xml-code,
.technical-toggle:checked ~ .tab-panels .field-section .xml-code-value {
  display: inline;
}

.xml-value .info-link {
  margin-left: 7px;
}

.code-meaning,
.xml-code-value {
  overflow-wrap: anywhere;
}

.xml-attributes {
  display: grid;
  grid-template-columns: minmax(100px, 180px) 1fr;
  gap: 3px 10px;
  margin: 6px 0;
  font-size: 14px;
}

dialog {
  width: min(920px, calc(100% - 28px));
  max-height: 86vh;
  border: 2px solid var(--ink);
  background: var(--paper);
  color: var(--ink);
  padding: 20px;
}

dialog::backdrop {
  background: rgba(17, 24, 39, 0.45);
}

.dialog-close {
  float: right;
  margin-top: 0;
}

@media (max-width: 640px) {
  nav {
    align-items: flex-start;
    padding: 12px 0;
  }

  h1 {
    font-size: 36px;
  }

  .preview-layout {
    grid-template-columns: 1fr;
  }

  .workspace-layout,
  .preview-layout {
    grid-template-columns: 1fr;
  }

  .workspace-sidebar,
  .preview-sidebar {
    position: static;
  }

  .convert-workspace {
    grid-template-columns: 1fr;
  }

  .book-preview,
  dl {
    grid-template-columns: 1fr;
  }

  .tab-label {
    width: 100%;
    margin-right: 0;
  }

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

  .compare-header {
    display: none;
  }
}