:root {
  color-scheme: dark;
  --page-pad: clamp(14px, 2.2vw, 38px);
  --base-size: 32px;
  --base-leading: 1.28;
  --space-xs: clamp(4px, 0.6vh, 8px);
  --space-sm: clamp(8px, 1.2vh, 16px);
  --space-md: clamp(14px, 2vh, 28px);
  --space-lg: clamp(22px, 3.5vh, 48px);
  --camera-x: 0px;
  --camera-y: 0px;
  --camera-scale: 1;
  --accent: #9db9cc;
  --panel: #292d30;
}

@font-face {
  font-family: "Arbutus Slab";
  src: url("/typed/ArbutusSlab.ttf") format("truetype");
  font-style: normal;
  font-weight: 400;
  font-display: swap;
}

* { box-sizing: border-box; }

html, body {
  width: 100%;
  max-width: 100%;
  min-height: 100%;
  margin: 0;
  overflow-x: hidden;
  background: #212121;
}

body {
  overflow-y: auto;
  color: #ffffff;
  font-family: Inter, "Atkinson Hyperlegible", ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

body::-webkit-scrollbar,
#editor::-webkit-scrollbar {
  display: none;
  width: 0;
  height: 0;
}

.typed-page {
  position: relative;
  width: 100%;
  max-width: 100%;
  min-height: 100dvh;
  padding: var(--page-pad);
  display: flex;
  align-items: flex-start;
  overflow: hidden;
  background: #212121;
  color: #ffffff;
}

body[data-mode="presentation"] .typed-page {
  align-items: center;
}

.typed-camera {
  width: 100%;
  max-width: none;
  min-width: 0;
  transform-origin: 0 0;
  transform: translate3d(var(--camera-x), var(--camera-y), 0) scale(var(--camera-scale));
  transition: transform 300ms cubic-bezier(.22, 1, .36, 1);
  will-change: transform;
}

body[data-mode="edit"] .typed-camera {
  max-width: none;
  margin-inline: 0;
  min-height: calc(100dvh - (2 * var(--page-pad)));
}

body[data-mode="presentation"] .typed-camera { max-width: none; }

.typed-content,
.typed-measure {
  display: block;
  width: 100%;
  max-width: none;
  min-width: 0;
  min-height: calc(var(--base-size) * var(--base-leading));
  margin: 0;
  padding: 0;
  border: 0;
  outline: none;
  overflow: visible;
  white-space: pre-wrap;
  overflow-wrap: normal;
  word-break: normal;
  hyphens: none;
  font-family: Inter, "Atkinson Hyperlegible", ui-sans-serif, system-ui, sans-serif;
  font-size: var(--base-size);
  font-weight: 400;
  line-height: var(--base-leading);
  letter-spacing: 0;
  caret-color: #ffffff;
  scrollbar-width: none;
  -ms-overflow-style: none;
}
body[data-mode="edit"] .typed-content { min-height: calc(100dvh - (2 * var(--page-pad))); }

.empty-state {
  position: absolute;
  top: var(--page-pad);
  left: var(--page-pad);
  z-index: 3;
  max-width: min(620px, calc(100% - (2 * var(--page-pad))));
  padding: 0;
  display: grid;
  justify-items: start;
  gap: 12px;
  border: 0;
  background: transparent;
  color: rgba(255,255,255,.66);
  text-align: left;
  cursor: text;
  font: 14px/1.5 system-ui, sans-serif;
}
.empty-state[hidden], body:not([data-mode="edit"]) .empty-state { display: none; }
.empty-state strong { color: rgba(255,255,255,.9); font-size: 22px; font-weight: 600; }
.empty-state span { display: flex; flex-wrap: wrap; gap: 7px; }
.empty-state code { padding: 4px 7px; border: 1px solid rgba(255,255,255,.14); border-radius: 3px; background: rgba(255,255,255,.055); color: rgba(255,255,255,.74); font: 12px/1.2 ui-monospace, monospace; }
.empty-state small { color: rgba(255,255,255,.48); }
.empty-state kbd { font: inherit; color: rgba(255,255,255,.75); }

.typed-content.is-single-word,
.typed-measure.is-single-word {
  white-space: nowrap;
  overflow: hidden;
  text-align: center;
}

.typed-content:focus { outline: none; }
.typed-content:focus-visible { outline: none; }
.typed-content > .is-active-block::before {
  content: "";
  position: absolute;
  width: 2px;
  height: min(1.15em, 34px);
  margin-left: -10px;
  margin-top: .1em;
  background: rgba(255, 255, 255, .7);
}
.typed-content::selection,
.typed-content *::selection { background: #8faec8; color: #151515; }

.typed-content > *,
.typed-measure > * {
  position: relative;
  margin: 0;
  padding: 0;
  font: inherit;
  line-height: inherit;
  letter-spacing: inherit;
}

body[data-mode="presentation"] [data-block-type="title"] {
  font-family: "Arbutus Slab", Georgia, serif;
  font-size: 1.36em;
  line-height: 1.08;
  text-align: center;
  margin-block: 0 var(--space-lg);
}

body[data-mode="presentation"] [data-block-type="subtitle"] {
  font-family: "Arbutus Slab", Georgia, serif;
  font-size: 1.12em;
  line-height: 1.15;
  text-align: center;
  margin-block: 0 var(--space-md);
}
body[data-mode="presentation"] [data-block-type="heading3"] { font-size: 1.04em; margin-block: 0 var(--space-sm); }

body[data-mode="presentation"] [data-block-type="equation"] {
  font-size: 1.38em;
  line-height: 1.08;
  text-align: center;
  white-space: nowrap;
  overflow: hidden;
  margin-block: var(--space-sm) var(--space-md);
}

body[data-mode="presentation"] [data-block-type="key-statement"],
body[data-mode="presentation"] [data-block-type="quotation"] {
  font-size: 1.08em;
  line-height: 1.2;
  text-align: center;
  margin-block: 0 var(--space-md);
}

body[data-mode="presentation"] [data-block-type="paragraph"] {
  text-align: left;
  margin-block: 0 var(--space-md);
}

body[data-mode="presentation"] [data-block-type="bullet-list"],
body[data-mode="presentation"] [data-block-type="numbered-list"] {
  text-align: left;
  margin-block: var(--space-sm) var(--space-md);
  padding-inline-start: 1.12em;
}

[data-block-type="bullet-list"] li,
[data-block-type="numbered-list"] li {
  margin: 0;
  padding-inline-start: 0.16em;
}

[data-block-type="bullet-list"] li + li,
[data-block-type="numbered-list"] li + li {
  margin-top: var(--space-sm);
}

[data-block-type="blank-separator"][data-empty="true"] {
  display: block;
  width: 100%;
  height: var(--space-md);
  min-height: var(--space-md);
  margin: 0;
  padding: 0;
  overflow: hidden;
  font-size: 0;
  line-height: 0;
}

body[data-mode="edit"] [data-block-type="title"] {
  width: min(100%, 24ch);
  margin: var(--space-lg) auto var(--space-lg);
  font-family: "Arbutus Slab", Georgia, serif;
  font-size: 2em;
  line-height: 1.08;
  text-align: center;
}

body[data-mode="edit"] [data-block-type="subtitle"] {
  width: min(100%, 72ch, 920px);
  margin: var(--space-lg) auto var(--space-sm);
  padding-bottom: var(--space-xs) !important;
  border-bottom: 1px solid color-mix(in srgb, var(--accent) 55%, transparent) !important;
  font-family: "Arbutus Slab", Georgia, serif;
  font-size: 1.34em;
  line-height: 1.18;
}
body[data-mode="edit"] [data-block-type="heading3"] { width: min(100%, 72ch, 920px); margin: var(--space-md) auto var(--space-xs); font-family: "Arbutus Slab", Georgia, serif; font-size: 1.12em; }

body[data-mode="edit"] [data-block-type="paragraph"],
body[data-mode="edit"] [data-block-type="quotation"],
body[data-mode="edit"] [data-block-type="equation"],
body[data-mode="edit"] [data-block-type="code"],
body[data-mode="edit"] [data-block-type="table"],
body[data-mode="edit"] [data-block-type="bullet-list"],
body[data-mode="edit"] [data-block-type="numbered-list"] {
  margin-block: 0 var(--space-md);
}

body[data-mode="edit"] [data-block-type="paragraph"],
body[data-mode="edit"] [data-block-type="quotation"],
body[data-mode="edit"] [data-block-type="code"] {
  width: min(100%, 72ch, 920px);
  margin-inline: auto;
  line-height: 1.5;
}

body[data-mode="edit"] [data-block-type="bullet-list"],
body[data-mode="edit"] [data-block-type="numbered-list"] {
  width: min(100%, 78ch, 980px);
  margin-inline: auto;
  padding-inline-start: 1.35em !important;
}

body[data-mode="edit"] [data-block-type="title"],
body[data-mode="edit"] [data-block-type="equation"],
body[data-mode="edit"] [data-block-type="table"],
body[data-mode="edit"] [data-block-type="image"],
body[data-mode="edit"] [data-block-type="page-break"] { width: 100%; }

body[data-mode="edit"] [data-block-type="equation"] {
  font-size: 1.18em;
  text-align: left;
  white-space: pre-wrap;
  overflow: visible;
}

[data-block-type="quotation"] {
  padding: var(--space-sm) var(--space-md) !important;
  border: 0 !important;
  border-inline-start: 4px solid var(--accent) !important;
  background: color-mix(in srgb, var(--panel) 86%, transparent);
  font-style: italic;
}

body[data-template="revision"] { --accent: #9fcbb6; --panel: #27312d; }
body[data-template="formula"] { --accent: #c9b7df; --panel: #2e2a33; }
body[data-template="homework"] { --accent: #e1bf79; --panel: #332f27; }
body[data-template="practical"] { --accent: #dda69d; --panel: #332a29; }

body[data-mode="edit"] [data-section-kind] { color: color-mix(in srgb, var(--accent) 88%, white); }
body[data-mode="edit"] [data-section-kind="objectives"] + ul,
body[data-mode="edit"] [data-section-kind="worked-example"] + div,
body[data-mode="edit"] [data-section-kind="homework"] + div,
body[data-mode="edit"] [data-section-kind="starter"] + div,
body[data-mode="edit"] [data-section-kind="exit-ticket"] + div,
body[data-mode="edit"] [data-section-kind="key-point"] + blockquote {
  width: min(100%, 76ch, 960px);
  margin-inline: auto;
  padding: var(--space-md) var(--space-lg) !important;
  border: 1px solid color-mix(in srgb, var(--accent) 35%, transparent) !important;
  border-inline-start: 4px solid var(--accent) !important;
  border-radius: 5px;
  background: color-mix(in srgb, var(--panel) 92%, transparent);
}
body[data-mode="edit"] [data-section-kind="objectives"] + ul { list-style: none; padding-inline-start: var(--space-lg) !important; }
body[data-mode="edit"] [data-section-kind="objectives"] + ul li::before { content: "□"; position: absolute; margin-left: -1.35em; color: var(--accent); }

[data-block-type="code"] {
  padding: var(--space-sm) !important;
  white-space: pre-wrap;
  tab-size: 2;
  font-family: ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", monospace;
  font-size: 0.9em;
  background: #181818;
}

[data-block-type="table"] {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9em;
}

[data-block-type="table"] th,
[data-block-type="table"] td {
  min-width: 4em;
  padding: var(--space-xs) var(--space-sm);
  border: 1px solid rgba(255, 255, 255, 0.34);
  text-align: left;
  vertical-align: top;
}
body:not([data-mode="print-preview"]) [data-block-type="table"] tbody tr:nth-child(even) { background: rgba(255,255,255,.045); }

[data-block-type="page-break"] {
  display: block;
  height: var(--space-lg);
  margin-block: var(--space-lg);
  border: 0;
  border-top: 1px dashed rgba(255, 255, 255, 0.28);
}

[data-block-type="image"] {
  margin-block: var(--space-md);
  text-align: center;
}
[data-block-type="image"][data-image-align="left"] { margin-inline: 0 auto; }
[data-block-type="image"][data-image-align="center"] { margin-inline: auto; }
[data-block-type="image"][data-image-align="right"] { margin-inline: auto 0; }
[data-block-type="image"][data-image-crop="true"] img { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; }

[data-block-type="image"] img {
  display: block;
  width: auto;
  max-width: 100%;
  max-height: 68vh;
  margin-inline: auto;
  object-fit: contain;
}

[data-block-type="image"] figcaption {
  margin-top: var(--space-xs);
  font-size: 0.78em;
  color: rgba(255, 255, 255, 0.72);
}
.typed-attachment {
  width: min(100%, 760px);
  min-height: 58px;
  margin-block: var(--space-sm);
  padding: 9px 12px !important;
  display: grid;
  grid-template-columns: 32px 1fr;
  grid-template-rows: auto auto;
  align-items: center;
  border: 1px solid rgba(255,255,255,.22);
  border-radius: 5px;
  cursor: pointer;
}
.typed-attachment > span { grid-row: 1 / 3; font: 24px/1 system-ui, sans-serif; }
.typed-attachment strong { font-size: .76em; font-weight: 400; }
.typed-attachment small { color: rgba(255,255,255,.62); font: 11px/1.3 system-ui, sans-serif; }
.typed-attachment.is-missing-asset { opacity: .5; }
.image-tools {
  position: fixed;
  z-index: 25;
  display: flex;
  align-items: center;
  gap: 4px;
  max-width: calc(100vw - 16px);
  padding: 5px;
  overflow-x: auto;
  border: 1px solid rgba(255,255,255,.2);
  border-radius: 6px;
  background: rgba(35,35,35,.97);
  color: #fff;
  font: 11px/1 system-ui, sans-serif;
}
.image-tools[hidden] { display: none; }
.image-tools button { height: 30px; padding: 0 8px; border: 0; border-radius: 3px; background: transparent; color: #fff; cursor: pointer; }
.image-tools button:hover { background: rgba(255,255,255,.12); }
.image-tools label { display: flex; align-items: center; gap: 4px; white-space: nowrap; }
.image-tools input[type="range"] { width: 90px; }
.image-tools input[type="text"] { width: 130px; height: 28px; border: 1px solid rgba(255,255,255,.2); border-radius: 3px; background: #1b1b1b; color: #fff; }

math-field {
  display: inline-block;
  min-width: 5em;
  max-width: 100%;
  padding: 0;
  border: 0;
  outline: none;
  background: transparent;
  color: inherit;
  font-size: 1.08em;
  --caret-color: currentColor;
  --selection-background-color: #8faec8;
  --selection-color: #151515;
}

math-field::part(menu-toggle),
math-field::part(virtual-keyboard-toggle) { display: none; }

[data-typed-highlight] {
  --highlight-colour: #f3ce8c;
  font: inherit;
  line-height: inherit;
  letter-spacing: inherit;
  vertical-align: baseline;
  color: inherit !important;
  padding: 0 !important;
  margin: 0 !important;
  border: 0 !important;
  border-radius: 0;
  background-color: transparent !important;
  background-image: linear-gradient(
    transparent 8%,
    var(--highlight-colour) 8%,
    var(--highlight-colour) 92%,
    transparent 92%
  ) !important;
  background-position: center;
  background-repeat: no-repeat;
  background-size: 100% 100%;
  box-decoration-break: clone;
  -webkit-box-decoration-break: clone;
  animation: typed-highlight-reveal 300ms cubic-bezier(.22, 1, .36, 1);
}
.typed-content code:not(pre code) { padding: .08em .24em; border-radius: 3px; background: #141414; font-family: ui-monospace, SFMono-Regular, Consolas, monospace; font-size: .86em; }
[data-task-list="true"] { list-style: none; padding-inline-start: .2em !important; }
[data-task-list="true"] input { width: .9em; height: .9em; margin-inline: 0 .4em; accent-color: #fff; }

@keyframes typed-highlight-reveal {
  from { background-size: 100% 0%; }
  to { background-size: 100% 100%; }
}

.typed-measure {
  position: fixed;
  visibility: hidden;
  pointer-events: none;
  left: -100000px;
  top: 0;
  height: auto;
  min-height: 0;
  transition: none;
}

body.is-camera-focused { overflow: hidden; }
body.is-camera-focused .typed-content { caret-color: transparent; }
body.is-camera-focused .typed-camera { transition-duration: 320ms; }

.camera-controls {
  position: fixed;
  right: max(16px, env(safe-area-inset-right));
  top: max(16px, env(safe-area-inset-top));
  z-index: 14;
  display: none;
  gap: 2px;
  padding: 3px;
  border: 1px solid rgba(255, 255, 255, .18);
  border-radius: 6px;
  background: rgba(31, 31, 31, .88);
  backdrop-filter: blur(8px);
}
body[data-mode="presentation"] .camera-controls,
body.is-camera-focused .camera-controls { display: flex; }
.camera-controls button,
.block-focus-handle {
  width: 34px;
  height: 34px;
  padding: 0;
  border: 0;
  border-radius: 3px;
  background: transparent;
  color: #fff;
  font: 19px/1 system-ui, sans-serif;
  cursor: pointer;
}
.camera-controls button:hover,
.camera-controls button:focus-visible,
.block-focus-handle:hover,
.block-focus-handle:focus-visible { background: rgba(255, 255, 255, .13); outline: 1px solid rgba(255, 255, 255, .65); }
.block-focus-handle {
  position: fixed;
  z-index: 15;
  background: rgba(31, 31, 31, .86);
  opacity: .72;
}
.block-focus-handle[hidden] { display: none; }
.is-focus-flash { animation: focus-flash 520ms ease-out; }
@keyframes focus-flash { 40% { background-color: rgba(143, 174, 200, .18); } }

.command-surface {
  position: fixed;
  inset: 0;
  z-index: 20;
  display: grid;
  place-items: start center;
  padding: min(18vh, 150px) 16px 16px;
  background: rgba(0, 0, 0, 0.42);
  animation: surface-fade-in 160ms ease-out;
}

.markdown-help {
  position: fixed;
  right: max(16px, env(safe-area-inset-right));
  bottom: 62px;
  z-index: 26;
  width: min(390px, calc(100vw - 32px));
  max-height: min(720px, calc(100dvh - 90px));
  padding: 14px;
  overflow: auto;
  border: 1px solid rgba(255,255,255,.2);
  border-radius: 6px;
  background: #292929;
  box-shadow: 0 14px 40px rgba(0,0,0,.34);
  color: #fff;
  font: 13px/1.35 system-ui, sans-serif;
  animation: panel-rise-in 160ms cubic-bezier(.22,1,.36,1);
}
.markdown-help[hidden], .template-surface[hidden] { display: none; }
.markdown-help header, .template-panel header { display: flex; align-items: flex-start; justify-content: space-between; gap: 12px; }
.markdown-help h2, .template-panel h2 { margin: 0; font: 24px/1.15 "Arbutus Slab", Georgia, serif; }
.markdown-help header button, .template-panel header button { width: 32px; height: 32px; border: 0; background: transparent; color: #fff; font: 24px/1 system-ui,sans-serif; cursor: pointer; }
.markdown-help table { width: 100%; margin-block: 12px; border-collapse: collapse; }
.markdown-help th, .markdown-help td { padding: 6px; border-bottom: 1px solid rgba(255,255,255,.1); text-align: left; }
.markdown-help code { color: #d9e8f1; font: 12px/1.2 ui-monospace, monospace; }
.markdown-help > button { width: 100%; min-height: 38px; border: 1px solid rgba(255,255,255,.22); border-radius: 4px; background: transparent; color:#fff; cursor:pointer; }

.template-surface { position: fixed; inset: 0; z-index: 29; display: grid; place-items: center; padding: 18px; background: rgba(0,0,0,.68); }
.template-panel { width: min(820px, 100%); max-height: 90dvh; padding: 22px; overflow: auto; border: 1px solid rgba(255,255,255,.2); border-radius: 6px; background: #252525; }
.template-panel header p { margin: 5px 0 0; color: rgba(255,255,255,.62); font: 13px/1.4 system-ui,sans-serif; }
.template-grid { margin-top: 20px; display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 8px; }
.template-grid button { min-height: 82px; padding: 14px; display:grid; gap:5px; border: 1px solid rgba(255,255,255,.16); border-radius: 5px; background: rgba(255,255,255,.035); color:#fff; text-align:left; cursor:pointer; }
.template-grid button:hover, .template-grid button:focus-visible { border-color: var(--accent); background: rgba(255,255,255,.08); outline:none; }
.template-grid strong { font: 18px/1.2 "Arbutus Slab",Georgia,serif; }
.template-grid span { color:rgba(255,255,255,.62); font:12px/1.35 system-ui,sans-serif; }

.selection-toolbar {
  position: fixed;
  z-index: 24;
  display: flex;
  align-items: center;
  gap: 2px;
  max-width: calc(100vw - 16px);
  padding: 4px;
  overflow-x: auto;
  border: 1px solid rgba(255,255,255,.2);
  border-radius: 6px;
  background: rgba(35,35,35,.96);
  box-shadow: 0 8px 24px rgba(0,0,0,.28);
  animation: panel-rise-in 140ms ease-out;
}
.selection-toolbar[hidden] { display: none; }
.selection-toolbar > button,
.toolbar-swatches button {
  flex: 0 0 auto;
  width: 30px;
  height: 30px;
  padding: 0;
  border: 0;
  border-radius: 3px;
  background: transparent;
  color: #fff;
  font: 14px/1 system-ui, sans-serif;
  cursor: pointer;
}
.selection-toolbar > button:hover,
.selection-toolbar > button:focus-visible { background: rgba(255,255,255,.12); outline: 1px solid rgba(255,255,255,.55); }
.toolbar-swatches { display: flex; gap: 3px; padding-inline: 4px; border-inline: 1px solid rgba(255,255,255,.16); }
.toolbar-swatches button { width: 18px; height: 18px; margin-block: 6px; background: var(--swatch); border: 1px solid rgba(0,0,0,.35); }
.text-colour { width: 30px; height: 30px; display: grid; place-items: center; cursor: pointer; }
.text-colour input { width: 19px; height: 19px; padding: 0; border: 0; background: transparent; }

.document-controls {
  position: fixed;
  left: max(16px, env(safe-area-inset-left));
  bottom: max(16px, env(safe-area-inset-bottom));
  z-index: 13;
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 3px;
  border: 1px solid rgba(255,255,255,.14);
  border-radius: 6px;
  background: rgba(31,31,31,.86);
  color: rgba(255,255,255,.78);
  font: 12px/1 system-ui, sans-serif;
  backdrop-filter: blur(8px);
}
.local-only-status {
  position: fixed;
  right: max(16px, env(safe-area-inset-right));
  bottom: max(16px, env(safe-area-inset-bottom));
  z-index: 10;
  margin: 0;
  color: rgba(255,255,255,.44);
  font: 10px/1 system-ui, sans-serif;
  pointer-events: none;
}
body[data-mode="presentation"] .local-only-status,
body[data-mode="print-preview"] .local-only-status { display: none; }
.document-controls span { padding-inline: 7px; white-space: nowrap; }
.document-controls button {
  min-width: 30px;
  height: 30px;
  padding: 0 8px;
  border: 0;
  border-radius: 3px;
  background: transparent;
  color: #fff;
  font: 12px/1 system-ui, sans-serif;
  cursor: pointer;
}
.document-controls button:hover,
.document-controls button:focus-visible { background: rgba(255,255,255,.12); outline: 1px solid rgba(255,255,255,.55); }
#export-button { border-left: 1px solid rgba(255,255,255,.16); margin-left: 4px; }

.command-surface[hidden] { display: none; }

.command-panel {
  width: min(620px, 100%);
  max-height: min(68vh, 620px);
  overflow: hidden;
  background: #292929;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 6px;
  animation: panel-rise-in 160ms cubic-bezier(.22, 1, .36, 1);
}

#command-input {
  width: 100%;
  height: 52px;
  padding: 0 16px;
  border: 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.14);
  outline: none;
  background: transparent;
  color: #ffffff;
  font: 17px/1.2 system-ui, sans-serif;
}

#command-input:focus-visible { box-shadow: inset 0 0 0 2px rgba(255, 255, 255, 0.72); }

.command-results {
  max-height: calc(min(68vh, 620px) - 52px);
  padding: 6px;
  overflow-y: auto;
  scrollbar-width: thin;
}

.command-result {
  width: 100%;
  min-height: 42px;
  padding: 8px 10px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  border: 0;
  border-radius: 4px;
  background: transparent;
  color: #ffffff;
  text-align: left;
  font: 15px/1.3 system-ui, sans-serif;
  cursor: pointer;
}

.command-result:hover,
.command-result.is-active { background: rgba(255, 255, 255, 0.1); }
.command-result small { color: rgba(255, 255, 255, 0.62); }

.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;
}

.mode-indicator {
  position: fixed;
  right: max(16px, env(safe-area-inset-right));
  bottom: max(16px, env(safe-area-inset-bottom));
  z-index: 12;
  display: grid;
  justify-items: end;
  gap: 2px;
  pointer-events: none;
  opacity: 0;
  transform: translateY(6px);
  transition: opacity 150ms ease, transform 150ms ease;
  color: rgba(255, 255, 255, 0.88);
  text-shadow: 0 1px 2px #000000;
  font: 13px/1.25 system-ui, sans-serif;
}

.mode-indicator strong { font-weight: 400; }
.mode-indicator span { color: rgba(255, 255, 255, 0.6); font-size: 11px; }
.mode-indicator.is-visible { opacity: 1; transform: translateY(0); }

.first-visit-hint {
  position: fixed;
  left: 50%;
  bottom: max(18px, env(safe-area-inset-bottom));
  z-index: 11;
  display: flex;
  gap: 22px;
  pointer-events: none;
  opacity: 0;
  transform: translate(-50%, 8px);
  transition: opacity 180ms ease, transform 180ms ease;
  color: rgba(255, 255, 255, 0.74);
  font: 12px/1.3 system-ui, sans-serif;
  white-space: nowrap;
}

.first-visit-hint[hidden] { display: none; }
.first-visit-hint.is-visible { opacity: 1; transform: translate(-50%, 0); }
.first-visit-hint kbd {
  padding: 2px 5px;
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: 3px;
  background: rgba(255, 255, 255, 0.06);
  color: #ffffff;
  font: inherit;
}

.tutorial-surface {
  position: fixed;
  inset: 0;
  z-index: 30;
  display: grid;
  place-items: center;
  padding: 18px;
  background: rgba(0, 0, 0, 0.68);
  animation: surface-fade-in 220ms ease-out;
}

.tutorial-surface[hidden] { display: none; }

.tutorial-panel {
  position: relative;
  width: min(820px, 100%);
  min-height: min(620px, 88vh);
  display: grid;
  grid-template-rows: minmax(260px, 1fr) auto auto;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 6px;
  background: #252525;
  animation: tutorial-enter 260ms cubic-bezier(.22, 1, .36, 1);
}

.tutorial-close {
  position: absolute;
  top: 10px;
  right: 10px;
  z-index: 2;
  width: 36px;
  height: 36px;
  padding: 0;
  border: 0;
  background: transparent;
  color: rgba(255, 255, 255, 0.72);
  font: 28px/1 system-ui, sans-serif;
  cursor: pointer;
}

.tutorial-close:focus-visible,
.tutorial-actions button:focus-visible { outline: 2px solid #ffffff; outline-offset: 2px; }

.tutorial-demo {
  min-height: 280px;
  padding: 54px clamp(24px, 7vw, 72px) 28px;
  display: grid;
  place-content: center;
  gap: 16px;
  text-align: center;
  background: #1d1d1d;
  transition: transform 300ms cubic-bezier(.22, 1, .36, 1), opacity 220ms ease;
}

.tutorial-sample-title { font-size: clamp(38px, 6vw, 68px); transition: font-size 300ms cubic-bezier(.22, 1, .36, 1); }
.tutorial-sample-equation { font-size: clamp(30px, 4vw, 48px); transition: transform 320ms cubic-bezier(.22, 1, .36, 1), opacity 220ms ease; }
.tutorial-sample-point { font-size: clamp(18px, 2.4vw, 28px); transition: transform 320ms cubic-bezier(.22, 1, .36, 1), opacity 220ms ease; }
.tutorial-command-chips { display: none; flex-wrap: wrap; justify-content: center; gap: 8px; }
.tutorial-command-chips span { padding: 7px 10px; border: 1px solid rgba(255, 255, 255, 0.24); border-radius: 4px; font-size: 14px; }

.tutorial-demo[data-demo="typing"] .tutorial-sample-point { animation: tutorial-type 1.8s steps(22) infinite alternate; overflow: hidden; white-space: nowrap; }
.tutorial-practice, .tutorial-practice-status { display: none; }
.tutorial-demo[data-demo="typing"] > :not(.tutorial-practice):not(.tutorial-practice-status) { display: none; }
.tutorial-demo[data-demo="typing"] .tutorial-practice { display: block; width: min(580px, 78vw); min-height: 72px; padding: 12px 14px; border: 1px solid rgba(255,255,255,.26); border-radius: 4px; outline: none; color:#fff; text-align:left; font: 24px/1.35 system-ui,sans-serif; }
.tutorial-demo[data-demo="typing"] .tutorial-practice:empty::before { content: attr(data-placeholder); color: rgba(255,255,255,.4); }
.tutorial-demo[data-demo="typing"] .tutorial-practice.is-title { font: 42px/1.15 "Arbutus Slab",Georgia,serif; text-align:center; }
.tutorial-demo[data-demo="typing"] .tutorial-practice-status { display:block; color:rgba(255,255,255,.65); font:13px/1.4 system-ui,sans-serif; }
.tutorial-practice-status code { color:#fff; }
.tutorial-demo[data-demo="edit"] { text-align: left; }
.tutorial-demo[data-demo="present"] .tutorial-sample-title { font-size: clamp(54px, 8vw, 88px); }
.tutorial-demo[data-demo="present"] { transform: scale(1.05); }
.tutorial-demo[data-demo="focus"] .tutorial-sample-title,
.tutorial-demo[data-demo="focus"] .tutorial-sample-equation { opacity: 0.16; }
.tutorial-demo[data-demo="focus"] .tutorial-sample-point { transform: scale(1.7); }
.tutorial-demo[data-demo="zoom"] { animation: tutorial-zoom 1.8s cubic-bezier(.22, 1, .36, 1) infinite alternate; }
.tutorial-demo[data-demo="commands"] > :not(.tutorial-command-chips) { display: none; }
.tutorial-demo[data-demo="commands"] .tutorial-command-chips { display: flex; }

.tutorial-copy { padding: 22px 28px 18px; }
.tutorial-progress { margin-bottom: 7px; color: rgba(255, 255, 255, 0.52); font-size: 12px; }
.tutorial-copy h2 { margin: 0 0 8px; font-size: clamp(24px, 3vw, 34px); font-weight: 400; }
.tutorial-copy p { max-width: 62ch; margin: 0; color: rgba(255, 255, 255, 0.72); font: 15px/1.5 system-ui, sans-serif; }

.tutorial-actions { padding: 0 28px 24px; display: grid; grid-template-columns: 1fr auto 1fr; gap: 8px; }
.tutorial-actions button:last-child { justify-self: end; }
.tutorial-actions button {
  min-width: 92px;
  height: 38px;
  padding: 0 14px;
  border: 1px solid rgba(255, 255, 255, 0.24);
  border-radius: 4px;
  background: transparent;
  color: #ffffff;
  font: 14px/1 system-ui, sans-serif;
  cursor: pointer;
}
.tutorial-actions button:disabled { opacity: 0.3; cursor: default; }

body.is-camera-focused .typed-content > * { opacity: 0.16; transition: opacity 320ms ease; }
body.is-camera-focused .typed-content > .is-focus-target { opacity: 1; }
.is-inserted-block, .is-block-reveal { animation: block-reveal 180ms cubic-bezier(.22, 1, .36, 1); }
body.is-mode-transition .typed-camera { animation: mode-reframe 300ms cubic-bezier(.22, 1, .36, 1); }

@keyframes surface-fade-in { from { opacity: 0; } }
@keyframes panel-rise-in { from { opacity: 0; transform: translateY(8px); } }
@keyframes tutorial-enter { from { opacity: 0; transform: translateY(10px) scale(.985); } }
@keyframes tutorial-type { from { max-width: 0; } to { max-width: 24ch; } }
@keyframes tutorial-zoom { from { transform: scale(.92); } to { transform: scale(1.06); } }
@keyframes block-reveal { from { opacity: 0; transform: translateY(5px); } }
@keyframes mode-reframe { 0% { opacity: .72; transform: scale(.985); } 100% { opacity: 1; } }

body[data-mode="print-preview"] {
  padding-block: 24px;
  background: #555555;
}

body[data-mode="print-preview"] .typed-page {
  width: 210mm;
  min-height: 297mm;
  margin: 0 auto;
  padding: 18mm;
  display: block;
  overflow: visible;
  background: #ffffff;
  color: #111111;
  box-shadow: 0 2px 18px rgba(0, 0, 0, 0.28);
}

body[data-mode="print-preview"][data-paper="letter"] .typed-page {
  width: 216mm;
  min-height: 279mm;
}

body[data-mode="print-preview"] .typed-camera,
body[data-mode="print-preview"] .typed-content {
  width: 100%;
  max-width: none;
  transform: none;
  color: #111111;
  caret-color: #111111;
}

body[data-mode="print-preview"] [data-block-type="code"] { background: #f1f1f1; }
body[data-mode="print-preview"] [data-block-type="table"] th,
body[data-mode="print-preview"] [data-block-type="table"] td { border-color: #777777; }
body[data-mode="print-preview"] [data-block-type="page-break"] { border-color: #888888; }
body[data-mode="print-preview"] [data-block-type="image"] figcaption { color: #444444; }
body[data-mode="print-preview"] [data-block-type="title"] { font-size: 26pt; line-height: 1.15; margin-block: 0 12pt; }
body[data-mode="print-preview"] [data-block-type="title"] { font-family: "Arbutus Slab", Georgia, serif; text-align: center; }
body[data-mode="print-preview"] [data-block-type="subtitle"] { font-family: "Arbutus Slab", Georgia, serif; font-size: 17pt; line-height: 1.2; margin-block: 14pt 5pt; }
body[data-mode="print-preview"] [data-block-type="equation"] { margin-block: 10pt; text-align: center; font-size: 1.18em; }
body[data-mode="print-preview"] [data-block-type="quotation"] { border-inline-start-color: #555 !important; background: #f3f3f3; }
body[data-mode="print-preview"] [data-section-kind] + div,
body[data-mode="print-preview"] [data-section-kind] + ul { border-color: #777 !important; background: #f7f7f7; }
.print-footer { display: none; }
body[data-mode="print-preview"] .document-controls { display: none; }
body[data-mode="print-preview"] .print-footer {
  position: absolute;
  top: calc(297mm - 15mm);
  left: 50%;
  width: calc(210mm - 36mm);
  transform: translateX(-50%);
  display: flex;
  justify-content: space-between;
  color: #666;
  font: 9pt/1 system-ui,sans-serif;
}
body[data-mode="print-preview"] .print-page-number::after { content: "1"; }
.print-preview-controls {
  position: fixed;
  top: 16px;
  right: 16px;
  z-index: 15;
  display: none;
  gap: 3px;
  padding: 4px;
  border: 1px solid rgba(255,255,255,.2);
  border-radius: 5px;
  background: rgba(35,35,35,.94);
}
body[data-mode="print-preview"] .print-preview-controls { display: flex; }
.print-preview-controls button { height: 34px; padding: 0 10px; border:0; border-radius:3px; background:transparent; color:#fff; font:12px/1 system-ui,sans-serif; cursor:pointer; }
.print-preview-controls button:hover, .print-preview-controls button[aria-pressed="true"] { background:rgba(255,255,255,.13); }

@page { size: A4 portrait; margin: 18mm; }
@page typed-letter { size: Letter portrait; margin: 0.7in; }

@media print {
  html, body {
    overflow: visible;
    background: #ffffff !important;
    color: #111111 !important;
  }

  body[data-paper="letter"] { page: typed-letter; }
  .command-surface, .typed-measure, .camera-controls, .document-controls, .selection-toolbar, .image-tools, .mode-indicator, .first-visit-hint, .local-only-status, .block-focus-handle, .empty-state, .markdown-help, .template-surface, .tutorial-surface, .print-preview-controls { display: none !important; }
  .typed-page {
    width: auto !important;
    min-height: 0 !important;
    margin: 0 !important;
    padding: 0 !important;
    display: block !important;
    overflow: visible !important;
    background: #ffffff !important;
    color: #111111 !important;
    box-shadow: none !important;
  }
  .typed-camera,
  .typed-content {
    width: 100% !important;
    max-width: none !important;
    transform: none !important;
    color: #111111 !important;
    font-size: 11pt !important;
    line-height: 1.42 !important;
    caret-color: transparent !important;
  }
  [data-block-type="title"], [data-block-type="subtitle"] { break-after: avoid-page; }
  [data-block-type="title"] { font-size: 26pt !important; line-height: 1.15 !important; margin-block: 0 12pt !important; }
  [data-block-type="subtitle"] { font-size: 17pt !important; line-height: 1.2 !important; margin-block: 12pt 7pt !important; }
  [data-block-type="equation"] { margin-block: 10pt !important; text-align: center !important; font-size: 1.18em !important; }
  [data-block-type="equation"], [data-block-type="quotation"], table, pre { break-inside: avoid; }
  [data-block-type="image"] { break-inside: avoid; }
  [data-block-type="image"] img { max-height: 230mm; }
  [data-block-type="image"] figcaption { color: #444444 !important; }
  [data-block-type="quotation"] { border-inline-start-color: #555 !important; background: #f3f3f3 !important; }
  [data-section-kind] + div, [data-section-kind] + ul { border-color: #777 !important; background: #f7f7f7 !important; }
  [data-block-type="page-break"] { height: 0 !important; margin: 0 !important; border: 0 !important; break-after: page; }
  [data-block-type="code"] { background: #f1f1f1 !important; }
  [data-block-type="table"] thead { display: table-header-group; }
  [data-block-type="table"] th, [data-block-type="table"] td { border-color: #777777 !important; }
  [data-typed-highlight] { print-color-adjust: exact; -webkit-print-color-adjust: exact; }
  body[data-print-efficient="true"] [data-typed-highlight] { background: transparent !important; outline: 1px solid #777; }
  body[data-print-efficient="true"] [data-section-kind] + div,
  body[data-print-efficient="true"] [data-section-kind] + ul,
  body[data-print-efficient="true"] [data-block-type="quotation"] { background: transparent !important; }
  .print-footer { position: fixed; left: 0; right: 0; bottom: -10mm; display: flex !important; justify-content: space-between; color:#555; font: 8pt/1 system-ui,sans-serif; }
  .print-page-number::after { content: counter(page); }
}

@media (max-width: 720px) {
  :root { --page-pad: max(14px, env(safe-area-inset-left)); }
  .typed-page {
    padding-top: max(16px, env(safe-area-inset-top));
    padding-bottom: max(24px, env(safe-area-inset-bottom));
  }
  .first-visit-hint { gap: 10px; font-size: 10px; }
  .tutorial-panel { min-height: min(650px, 92vh); grid-template-rows: minmax(220px, 1fr) auto auto; }
  .tutorial-demo { min-height: 220px; }
  .document-controls #text-size-label,
  .document-controls [data-size-action="reset"] { display: none; }
  .template-grid { grid-template-columns: 1fr; }
  .local-only-status { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  .typed-camera { transition: none; }
  [data-typed-highlight],
  .command-surface,
  .command-panel,
  .tutorial-surface,
  .tutorial-panel,
  .tutorial-demo,
  .tutorial-sample-point,
  .is-inserted-block,
  .is-block-reveal,
  body.is-mode-transition .typed-camera { animation: none; transition: none; }
}