:root {
  color-scheme: light dark;
  --bg: #f4f4f5;
  --panel: #ffffff;
  --border: #d4d4d8;
  --text: #18181b;
  --muted: #71717a;
  --accent: #2563eb;
  --placeholder-bg: #fafafa;
  --font-ui: system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: ui-monospace, "Cascadia Code", "Source Code Pro", monospace;
  --markup-bg: #ffffff;
  --markup-fg: #24292e;
  --markup-hover: rgba(37, 99, 235, 0.08);
  --markup-selected: rgba(37, 99, 235, 0.14);
  --xml-tag: #116329;
  --xml-bracket: #24292e;
  --xml-attr-name: #0550ae;
  --xml-attr-value: #0a3069;
  --xml-text: #24292e;
  --xml-cdata: #6a737d;
  --xml-cdata-delimiter: #6a737d;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #09090b;
    --panel: #18181b;
    --border: #3f3f46;
    --text: #fafafa;
    --muted: #a1a1aa;
    --placeholder-bg: #27272a;
    --markup-bg: #1e1e1e;
    --markup-fg: #d4d4d4;
    --markup-hover: rgba(96, 165, 250, 0.1);
    --markup-selected: rgba(96, 165, 250, 0.18);
    --xml-tag: #4ec9b0;
    --xml-bracket: #808080;
    --xml-attr-name: #9cdcfe;
    --xml-attr-value: #ce9178;
    --xml-text: #d4d4d4;
    --xml-cdata: #b5cea8;
    --xml-cdata-delimiter: #808080;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--font-ui);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

body.drag-over {
  background: color-mix(in srgb, var(--accent) 6%, var(--bg));
}

body.drag-over .empty-state {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 8%, var(--placeholder-bg));
}

header {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 1rem;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border);
  background: var(--panel);
}

.header-brand {
  display: flex;
  align-items: center;
  gap: 1rem;
  min-width: 0;
  grid-column: 1;
  justify-self: start;
}

.header-logo-link {
  display: block;
  flex-shrink: 0;
  border-radius: 0.25rem;
  line-height: 0;
  text-decoration: none;
}

.header-logo-link:hover {
  opacity: 0.8;
}

.header-logo {
  display: block;
  height: 2.25rem;
  width: auto;
}

.header-logo-link:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

header h1 {
  margin: 0;
  font-size: 1.1rem;
  font-weight: 600;
}

.doc-label {
  color: var(--muted);
  font-size: 0.875rem;
  font-weight: 400;
  min-width: 0;
  max-width: min(40vw, 28rem);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  grid-column: 2;
  justify-self: center;
}

.toolbar {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  grid-column: 3;
  justify-self: end;
}

.drop-banner {
  display: none;
  margin: 0;
  padding: 0.35rem 1rem;
  text-align: center;
  font-size: 0.8125rem;
  color: var(--muted);
  background: color-mix(in srgb, var(--accent) 8%, var(--panel));
  border-bottom: 1px solid var(--border);
}

body.viewer-loaded.drag-over .drop-banner {
  display: block;
}

.header-site-link {
  margin-left: 0.25rem;
  padding-left: 0.75rem;
  border-left: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.875rem;
  text-decoration: none;
  white-space: nowrap;
}

.header-site-link:hover {
  color: var(--accent);
  text-decoration: underline;
}

.header-site-link:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 0.125rem;
}

button,
label.file-btn {
  appearance: none;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  border-radius: 0.375rem;
  padding: 0.4rem 0.75rem;
  font: inherit;
  font-size: 0.875rem;
  cursor: pointer;
}

button:hover,
label.file-btn:hover {
  border-color: var(--accent);
}

button:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

label.file-btn input {
  display: none;
}

.page-nav {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.5rem 1rem;
  border-bottom: 1px solid var(--border);
  background: var(--panel);
}

.page-nav span {
  font-size: 0.875rem;
  color: var(--muted);
}

.page-nav-toggle {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  margin-left: auto;
  font-size: 0.875rem;
  cursor: pointer;
  user-select: none;
}

.page-nav-toggle input {
  margin: 0;
  cursor: pointer;
}

main.split {
  display: none;
  grid-template-columns: 1fr 1fr 1fr;
  flex: 1 1 0;
  min-height: 0;
}

body.viewer-loaded #main {
  display: grid;
}

body.viewer-loaded:not(.has-page-view) #main {
  grid-template-columns: 1fr 1fr;
}

body.viewer-loaded:not(.has-page-view) .pane-page-view {
  display: none;
}

body:not(.viewer-loaded) #page-nav,
body.markup-only #page-nav {
  display: none;
}

body.viewer-loaded #empty-state {
  display: none;
}

.pane {
  display: flex;
  flex-direction: column;
  border-right: 1px solid var(--border);
  min-height: 0;
}

.pane:last-child {
  border-right: none;
}

.pane-header {
  padding: 0.5rem 0.75rem;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
  border-bottom: 1px solid var(--border);
  background: var(--panel);
}

.pane-body {
  flex: 1;
  min-height: 0;
  overflow: auto;
  padding: 1rem;
}

#markup-pane {
  padding: 0;
  background: var(--markup-bg);
  color: var(--markup-fg);
}

#markup-pane .placeholder {
  margin: 1rem;
}

#page-pane {
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

#page-pane:focus {
  outline: none;
}

#page-pane:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: -2px;
}

.placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 12rem;
  color: var(--muted);
  font-style: italic;
  background: var(--placeholder-bg);
  border: 1px dashed var(--border);
  border-radius: 0.5rem;
  padding: 2rem;
  text-align: center;
}

pre.markup {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  line-height: 1.5;
  white-space: pre-wrap;
  word-break: break-word;
}

.markup {
  margin: 0;
  padding: 0.75rem 1rem 1rem;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  line-height: 1.55;
  tab-size: 2;
  --markup-indent: 2ch;
  --markup-gutter-width: 1rem;
}

.markup-ghost-tag-part {
  opacity: 0.35;
  cursor: help;
}

.cursor-hint {
  position: fixed;
  z-index: 200;
  width: max-content;
  max-width: 16rem;
  padding: 0.3rem 0.5rem;
  border-radius: 0.25rem;
  background: var(--panel);
  border: 1px solid var(--border);
  color: var(--text);
  font-family: var(--font-ui);
  font-size: 0.75rem;
  line-height: 1.35;
  text-align: center;
  white-space: normal;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.12);
  pointer-events: none;
}

.markup-el {
  cursor: pointer;
  border-radius: 0.2rem;
}

.markup-el:hover {
  background: var(--markup-hover);
}

.markup-el.selected {
  background: var(--markup-selected);
  box-shadow: inset 0 0 0 1px var(--accent);
}

.markup-line {
  white-space: pre-wrap;
  word-break: break-word;
  cursor: pointer;
  padding: 0 0.25rem;
  border-radius: 0.15rem;
}

.markup-line-content {
  display: flex;
  align-items: baseline;
  min-width: 0;
  padding-left: calc(var(--markup-depth, 0) * var(--markup-indent));
}

.markup-gutter {
  flex: 0 0 var(--markup-gutter-width);
  width: var(--markup-gutter-width);
  display: flex;
  align-items: center;
  justify-content: center;
}

.markup-line-body {
  flex: 1 1 auto;
  min-width: 0;
}

.markup-fold-toggle {
  appearance: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: var(--markup-gutter-width);
  height: 1rem;
  margin: 0;
  padding: 0;
  border: none;
  border-radius: 0.15rem;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  flex-shrink: 0;
}

.markup-fold-toggle::before {
  content: "";
  display: block;
  width: 0;
  height: 0;
  border-top: 4px solid transparent;
  border-bottom: 4px solid transparent;
  border-left: 5px solid currentColor;
  transform: rotate(90deg);
  transition: transform 0.12s ease;
}

.markup-el-foldable.markup-collapsed > .markup-line-open .markup-fold-toggle::before {
  transform: rotate(0deg);
}

.markup-fold-toggle:hover {
  background: var(--markup-hover);
  color: var(--markup-fg);
}

.markup-fold-suffix {
  display: none;
}

.markup-el-foldable.markup-collapsed > .markup-line-open .markup-fold-suffix {
  display: inline;
}

.markup-el-foldable.markup-collapsed > .markup-fold-body {
  display: none;
}

.xml-tag {
  color: var(--xml-tag);
}

.xml-bracket {
  color: var(--xml-bracket);
}

.xml-attr-name {
  color: var(--xml-attr-name);
}

.xml-attr-value {
  color: var(--xml-attr-value);
}

.xml-text {
  color: var(--xml-text);
}

.xml-cdata {
  color: var(--xml-cdata);
}

.xml-cdata-delimiter {
  color: var(--xml-cdata-delimiter);
}

.page-view {
  position: relative;
  display: inline-block;
  max-width: 100%;
  max-height: 100%;
  line-height: 0;
}

.page-view img {
  display: block;
  max-width: 100%;
  max-height: 100%;
  width: auto;
  height: auto;
  object-fit: contain;
  border: 1px solid var(--border);
  border-radius: 0.25rem;
}

.page-view svg.overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: auto;
}

.overlay rect.bbox.bbox-hidden,
.overlay text.bbox-label.bbox-hidden {
  display: none;
}

.overlay rect.bbox {
  stroke-width: 2;
  vector-effect: non-scaling-stroke;
  pointer-events: all;
  cursor: pointer;
}

.overlay rect.bbox.selected {
  stroke: var(--accent) !important;
  fill: color-mix(in srgb, var(--accent) 30%, transparent) !important;
  stroke-width: 3.5;
  filter: drop-shadow(0 0 3px color-mix(in srgb, var(--accent) 60%, transparent));
}

.overlay text.bbox-label.selected {
  font-size: 12px;
  font-weight: 700;
}

.overlay text.bbox-label {
  font-family: var(--font-ui);
  font-size: 11px;
  font-weight: 600;
  paint-order: stroke fill;
  stroke: rgba(255, 255, 255, 0.85);
  stroke-width: 3px;
  pointer-events: none;
}

/* text */
.overlay .bbox-text { fill: rgba(37, 99, 235, 0.14); stroke: #2563eb; }
.overlay .bbox-label-text { fill: #1d4ed8; }

/* heading */
.overlay .bbox-heading { fill: rgba(124, 58, 237, 0.14); stroke: #7c3aed; }
.overlay .bbox-label-heading { fill: #6d28d9; }

/* list / ldiv */
.overlay .bbox-list,
.overlay .bbox-ldiv { fill: rgba(234, 88, 12, 0.14); stroke: #ea580c; }
.overlay .bbox-label-list,
.overlay .bbox-label-ldiv { fill: #c2410c; }

/* table */
.overlay .bbox-table { fill: rgba(22, 163, 74, 0.14); stroke: #16a34a; }
.overlay .bbox-label-table { fill: #15803d; }

/* index */
.overlay .bbox-index { fill: rgba(13, 148, 136, 0.14); stroke: #0d9488; }
.overlay .bbox-label-index { fill: #0f766e; }

/* formula */
.overlay .bbox-formula { fill: rgba(8, 145, 178, 0.14); stroke: #0891b2; }
.overlay .bbox-label-formula { fill: #0e7490; }

/* code */
.overlay .bbox-code { fill: rgba(71, 85, 105, 0.16); stroke: #475569; }
.overlay .bbox-label-code { fill: #334155; }

/* picture */
.overlay .bbox-picture { fill: rgba(219, 39, 119, 0.14); stroke: #db2777; }
.overlay .bbox-label-picture { fill: #be185d; }

/* group */
.overlay .bbox-group { fill: rgba(79, 70, 229, 0.14); stroke: #4f46e5; }
.overlay .bbox-label-group { fill: #4338ca; }

/* footnote */
.overlay .bbox-footnote { fill: rgba(161, 98, 7, 0.14); stroke: #a16207; }
.overlay .bbox-label-footnote { fill: #854d0e; }

/* page chrome */
.overlay .bbox-page_header,
.overlay .bbox-page_footer { fill: rgba(113, 113, 122, 0.14); stroke: #71717a; }
.overlay .bbox-label-page_header,
.overlay .bbox-label-page_footer { fill: #52525b; }

/* caption */
.overlay .bbox-caption { fill: rgba(190, 24, 93, 0.12); stroke: #be185d; }
.overlay .bbox-label-caption { fill: #9d174d; }

/* form fields */
.overlay .bbox-field { fill: rgba(217, 119, 6, 0.14); stroke: #d97706; }
.overlay .bbox-label-field { fill: #b45309; }

/* fallback */
.overlay .bbox-default { fill: rgba(220, 38, 38, 0.12); stroke: #dc2626; }
.overlay .bbox-label-default { fill: #b91c1c; }

@media (prefers-color-scheme: dark) {
  .overlay text.bbox-label {
    stroke: rgba(0, 0, 0, 0.75);
  }

  .overlay .bbox-text { fill: rgba(96, 165, 250, 0.2); stroke: #60a5fa; }
  .overlay .bbox-label-text { fill: #93c5fd; }

  .overlay .bbox-heading { fill: rgba(167, 139, 250, 0.2); stroke: #a78bfa; }
  .overlay .bbox-label-heading { fill: #c4b5fd; }

  .overlay .bbox-list,
  .overlay .bbox-ldiv { fill: rgba(251, 146, 60, 0.2); stroke: #fb923c; }
  .overlay .bbox-label-list,
  .overlay .bbox-label-ldiv { fill: #fdba74; }

  .overlay .bbox-table { fill: rgba(74, 222, 128, 0.18); stroke: #4ade80; }
  .overlay .bbox-label-table { fill: #86efac; }

  .overlay .bbox-index { fill: rgba(45, 212, 191, 0.18); stroke: #2dd4bf; }
  .overlay .bbox-label-index { fill: #5eead4; }

  .overlay .bbox-formula { fill: rgba(34, 211, 238, 0.18); stroke: #22d3ee; }
  .overlay .bbox-label-formula { fill: #67e8f9; }

  .overlay .bbox-code { fill: rgba(148, 163, 184, 0.2); stroke: #94a3b8; }
  .overlay .bbox-label-code { fill: #cbd5e1; }

  .overlay .bbox-picture { fill: rgba(244, 114, 182, 0.2); stroke: #f472b6; }
  .overlay .bbox-label-picture { fill: #f9a8d4; }

  .overlay .bbox-group { fill: rgba(129, 140, 248, 0.2); stroke: #818cf8; }
  .overlay .bbox-label-group { fill: #a5b4fc; }

  .overlay .bbox-footnote { fill: rgba(250, 204, 21, 0.18); stroke: #facc15; }
  .overlay .bbox-label-footnote { fill: #fde047; }

  .overlay .bbox-page_header,
  .overlay .bbox-page_footer { fill: rgba(161, 161, 170, 0.18); stroke: #a1a1aa; }
  .overlay .bbox-label-page_header,
  .overlay .bbox-label-page_footer { fill: #d4d4d8; }

  .overlay .bbox-caption { fill: rgba(244, 114, 182, 0.16); stroke: #f472b6; }
  .overlay .bbox-label-caption { fill: #fbcfe8; }

  .overlay .bbox-field { fill: rgba(251, 191, 36, 0.18); stroke: #fbbf24; }
  .overlay .bbox-label-field { fill: #fcd34d; }

  .overlay .bbox-default { fill: rgba(248, 113, 113, 0.18); stroke: #f87171; }
  .overlay .bbox-label-default { fill: #fca5a5; }
}

.empty-state {
  flex: 1 1 0;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 0;
  margin: 1rem;
  padding: 2rem 1.5rem;
  border: 2px dashed var(--border);
  border-radius: 0.75rem;
  background: var(--placeholder-bg);
  text-align: center;
  color: var(--muted);
}

.empty-state-inner {
  max-width: 28rem;
}

.empty-state-title {
  margin: 0 0 0.75rem;
  font-size: 1.05rem;
  color: var(--text);
}

.empty-state p {
  margin: 0.5rem 0;
}

.empty-state-action {
  margin: 0 0 0.75rem;
}

.text-link {
  color: var(--accent);
  text-decoration: underline;
}

.text-link:hover {
  opacity: 0.85;
}

.empty-state-meta {
  font-size: 0.875rem;
}

.rendered-doc {
  max-width: 42rem;
  margin: 0 auto;
  line-height: 1.6;
}

.rendered-el-virtual-text > p,
.rendered-el-virtual-text > div {
  margin: 0;
  display: inline;
}

.rendered-doc li > .rendered-el-virtual-text {
  display: inline;
}

.rendered-doc li > .rendered-el-virtual-text > p,
.rendered-doc li > .rendered-el-virtual-text > div {
  display: inline;
  margin: 0;
}

.rendered-table .rendered-el-virtual-text {
  display: inline;
  margin: 0;
}

.rendered-table .rendered-el-virtual-text > p,
.rendered-table .rendered-el-virtual-text > div {
  display: inline;
  margin: 0;
}

.rendered-el-virtual-text > div > .rendered-el {
  display: block;
  margin: 0.25rem 0;
}

.rendered-el {
  cursor: pointer;
  border-radius: 0.25rem;
}

.rendered-el:hover {
  outline: 1px solid color-mix(in srgb, var(--accent) 35%, transparent);
}

.rendered-el.selected {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  background: color-mix(in srgb, var(--accent) 8%, transparent);
}

.rendered-doc p {
  margin: 0 0 0.75rem;
}

.rendered-doc h1,
.rendered-doc h2,
.rendered-doc h3,
.rendered-doc h4,
.rendered-doc h5,
.rendered-doc h6 {
  margin: 1.25rem 0 0.5rem;
  line-height: 1.25;
}

.rendered-doc h1:first-child,
.rendered-doc h2:first-child,
.rendered-doc h3:first-child {
  margin-top: 0;
}

.rendered-doc ul,
.rendered-doc ol {
  margin: 0 0 0.75rem;
  padding-left: 1.5rem;
}

.rendered-doc li {
  margin: 0.25rem 0;
}

.rendered-doc li > .rendered-el {
  display: inline;
}

.rendered-doc li > .rendered-el > p {
  display: inline;
  margin: 0;
}

.rendered-marker {
  margin-right: 0.35rem;
}

.rendered-handwriting {
  font-family: "Segoe Print", "Bradley Hand", cursive;
}

.rendered-doc pre {
  margin: 0 0 0.75rem;
  padding: 0.75rem 1rem;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  line-height: 1.5;
  background: var(--placeholder-bg);
  border: 1px solid var(--border);
  border-radius: 0.375rem;
}

.rendered-doc code {
  font-family: var(--font-mono);
  font-size: 0.875em;
}

.rendered-doc pre code {
  font-size: inherit;
  background: none;
  border: none;
  padding: 0;
}

.rendered-code-label {
  display: block;
  margin-bottom: 0.25rem;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.rendered-formula {
  display: block;
  margin: 0 0 0.75rem;
  padding: 0.5rem 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  background: var(--placeholder-bg);
  border-left: 3px solid var(--border);
  overflow-x: auto;
}

.rendered-formula-inline {
  display: inline;
  font-family: var(--font-mono);
  font-size: 0.875em;
}

.rendered-doc figure {
  margin: 0 0 0.75rem;
}

.rendered-doc figure img {
  max-width: 100%;
  height: auto;
  border: 1px solid var(--border);
  border-radius: 0.25rem;
}

.rendered-doc figcaption {
  margin-top: 0.35rem;
  font-size: 0.875rem;
  color: var(--muted);
}

.rendered-picture-contents {
  margin-top: 0.5rem;
  font-size: 0.875rem;
  border: 1px solid var(--border);
  border-radius: 0.375rem;
  background: var(--placeholder-bg);
}

.rendered-picture-contents summary {
  padding: 0.4rem 0.65rem;
  cursor: pointer;
  font-weight: 600;
  color: var(--muted);
  user-select: none;
}

.rendered-picture-contents summary:hover {
  color: var(--text);
}

.rendered-picture-contents-body {
  padding: 0.5rem 0.75rem 0.75rem;
  border-top: 1px solid var(--border);
}

.rendered-picture-contents-body .rendered-el > p {
  margin-bottom: 0.35rem;
  font-size: 0.8125rem;
}

.rendered-table {
  width: 100%;
  margin: 0 0 0.75rem;
  border-collapse: collapse;
  font-size: 0.875rem;
}

.rendered-table caption {
  caption-side: top;
  margin-bottom: 0.35rem;
  font-size: 0.875rem;
  color: var(--muted);
  text-align: left;
}

.rendered-table th,
.rendered-table td {
  border: 1px solid var(--border);
  padding: 0.35rem 0.5rem;
  vertical-align: top;
  text-align: left;
}

.rendered-table th {
  background: color-mix(in srgb, var(--border) 35%, var(--panel));
  font-weight: 600;
}

.rendered-table .rendered-table-cell-text {
  display: inline;
}

.rendered-table .rendered-el {
  margin: 0;
}

.rendered-table .rendered-el > p {
  margin: 0;
  display: inline;
}

.rendered-table .rendered-table {
  margin: 0.25rem 0 0;
}

.rendered-page-header,
.rendered-page-footer {
  font-size: 0.875rem;
  color: var(--muted);
}

.rendered-page-header {
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}

.rendered-page-footer {
  margin-top: 1rem;
  padding-top: 0.5rem;
  border-top: 1px solid var(--border);
}

.rendered-footnote {
  font-size: 0.875rem;
  color: var(--muted);
  border-left: 2px solid var(--border);
  padding-left: 0.75rem;
  margin: 0 0 0.75rem;
}

.rendered-unsupported {
  margin: 0 0 0.75rem;
  padding: 0.5rem 0.75rem;
  font-size: 0.8125rem;
  font-style: italic;
  color: var(--muted);
  background: var(--placeholder-bg);
  border: 1px dashed var(--border);
  border-radius: 0.375rem;
}

@media (max-width: 1200px) {
  body.viewer-loaded #main {
    grid-template-columns: 1fr;
  }

  .pane {
    border-right: none;
    border-bottom: 1px solid var(--border);
  }
}