@font-face {
  font-family: "IBM Plex Mono";
  src: url("../font/IBMPlexMono-Regular.ttf") format("truetype");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "IBM Plex Mono";
  src: url("../font/IBMPlexMono-Italic.ttf") format("truetype");
  font-weight: 400;
  font-style: italic;
  font-display: swap;
}

:root {
  color-scheme: dark;
  --bg: #121212;
  --surface: #1b1b1b;
  --surface2: #252629;
  --surface3: #2b2d31;
  --fg: #ececf0;
  --muted: #b7b8be;
  --dim: #7c8391;
  --border: #2f2f2f;
  --border2: #3a3a3a;
  --accent: #4697d9;
  --accent-hover: #6bc9cf;
  --accent2: #dbbc7f;
  --accent3: #f07a7a;
  --blue: #4697d9;
  --download-blue: oklch(48% .23 264);
  --download-blue-hover: oklch(56% .22 264);
  --control-blue: #2f6fa7;
  --control-blue-hover: #4386bd;
  --mono: "IBM Plex Mono", "SFMono-Regular", Menlo, Consolas, monospace;
  --serif: "IBM Plex Serif", Georgia, serif;
  --sans: Inter, "Segoe UI", system-ui, -apple-system, sans-serif;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--sans);
  font-size: 17px;
  scroll-padding-top: 72px;
  -webkit-font-smoothing: antialiased;
}

body {
  min-height: 100vh;
  background: var(--bg);
}

a {
  color: var(--accent);
  text-decoration: none;
}

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

img,
video,
canvas {
  display: block;
  max-width: 100%;
}

code,
pre,
kbd {
  font-family: var(--mono);
}

code {
  padding: 0.08rem 0.3rem;
  color: var(--accent2);
  border: 1px solid rgba(216, 183, 111, 0.2);
  background: rgba(216, 183, 111, 0.08);
  border-radius: 3px;
  font-size: 0.9em;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 1rem;
  min-height: 56px;
  padding: 0 1.25rem;
  background: rgba(17, 18, 20, 0.94);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(14px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  color: var(--muted);
  font-weight: 600;
  font-size: 0.9rem;
}

.brand img {
  width: 26px;
  height: 26px;
  border-radius: 5px;
  border: 1px solid var(--border2);
  background: #07080a;
}

.top-links,
.top-actions {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.top-links a,
.top-actions a {
  padding: 0.34rem 0.65rem;
  color: var(--muted);
  border-radius: 4px;
  font-size: 0.84rem;
}

.top-links a:hover,
.top-links a.active,
.top-actions a:hover {
  color: var(--fg);
  background: rgba(255, 255, 255, 0.06);
}

.top-actions {
  justify-self: end;
}

.top-actions .download-link {
  color: #fff;
  border: 1px solid color-mix(in oklch, var(--download-blue), white 24%);
  background: var(--download-blue);
}

.top-actions .download-link:hover {
  color: #fff;
  background: var(--download-blue-hover);
}

.home-page,
.wide-page {
  width: min(100%, 1180px);
  margin: 0 auto;
  padding: 0 2rem 5rem;
}

.home-hero {
  min-height: min(520px, calc(100vh - 190px));
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 3rem 1rem 2.7rem;
  border-inline: 1px dashed var(--border);
  text-align: center;
}

.home-hero > * {
  width: min(680px, 100%);
}

.announcement,
.eyebrow {
  margin-bottom: 0.75rem;
  color: var(--accent);
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0;
  text-transform: uppercase;
}

.page-head h1,
.prose h1 {
  color: var(--fg);
  font-size: clamp(2rem, 5vw, 4.5rem);
  line-height: 1.05;
  letter-spacing: 0;
}

.home-hero h1 {
  margin: 0;
  color: var(--fg);
  font-family: var(--serif);
  font-size: clamp(2.6rem, 7vw, 5rem);
  font-weight: 400;
  line-height: 1.06;
  letter-spacing: 0;
}

.hero-copy,
.page-head p {
  margin-top: 1rem;
  color: var(--muted);
  font-size: 1.08rem;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.7rem;
  margin-top: 1.6rem;
}

.primary-action,
.ghost-action {
  display: inline-flex;
  align-items: center;
  min-height: 42px;
  padding: 0.55rem 1rem;
  border-radius: 5px;
  font-size: 0.9rem;
  font-weight: 600;
}

.primary-action {
  color: #fff;
  background: var(--download-blue);
  border: 1px solid color-mix(in oklch, var(--download-blue), white 24%);
}

.primary-action:hover {
  color: #fff;
  background: var(--download-blue-hover);
}

.ghost-action {
  color: var(--muted);
  border: 1px solid var(--border2);
  background: transparent;
}

.ghost-action:hover {
  color: var(--fg);
  border-color: var(--dim);
}

.home-section {
  margin-top: 2.6rem;
}

.section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}

.section-head .eyebrow {
  margin-bottom: 0.65rem;
}

.section-head a {
  margin-bottom: 0.65rem;
  color: var(--dim);
  font-size: 0.85rem;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.85rem;
}

.card-grid.two {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.essay-index {
  display: grid;
}

.essay-row {
  display: grid;
  grid-template-columns: 9rem minmax(0, 1.1fr) minmax(0, 1.6fr);
  gap: 1rem;
  align-items: baseline;
  padding: 0.85rem 0;
  color: var(--muted);
  border-bottom: 1px solid var(--border);
}

.essay-row:hover {
  color: var(--fg);
}

.essay-row span {
  color: var(--dim);
  font-family: var(--mono);
  font-size: 0.75rem;
}

.essay-row strong {
  color: var(--fg);
  font-size: 1.04rem;
}

.essay-row small {
  color: var(--muted);
  font-size: 0.94rem;
  line-height: 1.45;
}

.series-index {
  display: grid;
  gap: 2.4rem;
}

.series-card {
  display: grid;
  grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.35fr);
  gap: 2rem;
  padding-top: 1.2rem;
  border-top: 1px solid var(--border);
}

.series-card header {
  min-width: 0;
}

.series-card h2 {
  margin: 0;
  color: var(--fg);
  font-size: 1.34rem;
  font-weight: 600;
  line-height: 1.25;
}

.series-card header p:not(.eyebrow) {
  margin-top: 0.7rem;
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.6;
}

.series-essay-list {
  display: grid;
  list-style: none;
}

.series-essay-list li {
  border-bottom: 1px solid var(--border);
}

.series-essay-list li:first-child {
  border-top: 1px solid var(--border);
}

.series-essay-list a {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.45rem;
  padding: 0.82rem 0;
  color: var(--muted);
}

.series-essay-list a:hover {
  color: var(--fg);
}

.series-essay-list strong {
  color: var(--fg);
  font-size: 1.02rem;
  line-height: 1.3;
}

.series-essay-list small {
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.45;
}

.content-card {
  display: grid;
  align-content: start;
  min-height: 190px;
  gap: 0.55rem;
  padding: 1rem;
  color: var(--fg);
  border: 1px solid var(--border);
  background: var(--surface);
  transition: border-color 0.1s, background 0.1s;
}

.content-card:hover {
  color: var(--fg);
  border-color: var(--accent);
  background: var(--surface);
}

.content-card span {
  color: var(--accent);
  font-family: var(--mono);
  font-size: 0.72rem;
  text-transform: uppercase;
}

.content-card strong {
  font-size: 1.14rem;
  line-height: 1.25;
}

.content-card small {
  color: var(--muted);
  font-size: 0.96rem;
  line-height: 1.55;
}

.page-head {
  max-width: 720px;
  padding: 4rem 0 2rem;
}

.page-head h1 {
  font-size: clamp(2rem, 4vw, 3.2rem);
}

.lesson-map {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin-bottom: 2rem;
  border: 1px solid var(--border);
  background: var(--border);
}

.lesson-map > div {
  display: grid;
  align-content: start;
  gap: 0.25rem;
  padding: 1rem;
  background: var(--surface);
}

.lesson-map h2 {
  color: var(--fg);
  font-size: 1rem;
}

.lesson-map p {
  margin-top: 0.55rem;
  color: var(--accent2);
  font-family: var(--mono);
  font-size: 0.75rem;
}

.lesson-map a {
  color: var(--muted);
  font-size: 0.88rem;
}

.reading-frame {
  display: grid;
  grid-template-columns: 220px minmax(0, 760px);
  gap: 1.25rem;
  justify-content: center;
  min-height: calc(100vh - 56px);
}

.essay-frame {
  display: grid;
  grid-template-columns: minmax(210px, 280px) minmax(0, 820px);
  gap: 2rem;
  justify-content: center;
  width: min(100%, 1180px);
  margin: 0 auto;
  padding: 0 2rem;
}

.essay-sidebar {
  position: sticky;
  top: 56px;
  align-self: start;
  height: calc(100vh - 56px);
  overflow-y: auto;
  padding: 3.5rem 0 2rem;
}

.essay-side-nav {
  display: grid;
  gap: 1.1rem;
}

.essay-date {
  padding-bottom: 1rem;
  color: var(--muted);
  border-bottom: 1px solid var(--border);
  font-family: var(--mono);
  font-size: 1rem;
}

.series-context {
  display: grid;
  gap: 0.72rem;
}

.series-context .eyebrow {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 0.82rem;
}

.series-context nav {
  display: grid;
  gap: 0.12rem;
}

.series-context a {
  display: block;
  min-height: 2rem;
  padding: 0.24rem 0.42rem;
  color: var(--muted);
  border-radius: 3px;
  font-size: 0.94rem;
  line-height: 1.35;
}

.series-context a:hover,
.series-context a.active {
  color: var(--fg);
  background: rgba(47, 111, 167, 0.12);
}

.reading-frame:not(:has(.related-panel)) {
  grid-template-columns: minmax(0, 760px);
}

.sidebar,
.related-panel {
  position: sticky;
  top: 56px;
  align-self: start;
  height: calc(100vh - 56px);
  overflow-y: auto;
}

.related-panel {
  border-right: 1px solid var(--border);
}

.side-nav {
  display: grid;
  gap: 0.18rem;
  padding: 1rem 0.8rem 2rem;
}

.side-nav p {
  margin: 1rem 0 0.25rem;
  color: var(--dim);
  font-family: var(--mono);
  font-size: 0.72rem;
  text-transform: uppercase;
}

.side-nav p:first-child {
  margin-top: 0;
}

.side-nav small {
  margin: 0.35rem 0 0.1rem;
  color: var(--accent2);
  font-size: 0.76rem;
}

.side-nav a {
  padding: 0.25rem 0.4rem;
  color: var(--muted);
  border-radius: 3px;
  font-size: 0.84rem;
  line-height: 1.35;
}

.side-nav a:hover,
.side-nav a.active {
  color: var(--fg);
  background: rgba(85, 183, 189, 0.1);
}

.toc-panel {
  position: sticky;
  top: 56px;
  align-self: start;
  height: calc(100vh - 56px);
  overflow-y: auto;
  padding: 4rem 1rem 2rem;
}

.toc-title {
  margin-bottom: 0.55rem;
  color: var(--dim);
  font-family: var(--mono);
  font-size: 0.72rem;
  text-transform: uppercase;
}

.toc-panel a {
  display: block;
  width: fit-content;
  margin: 0.25rem 0;
  color: var(--dim);
  font-size: 0.82rem;
}

.toc-panel a:hover {
  color: var(--muted);
}

.toc-h3 {
  margin-left: 1rem !important;
}

.toc-h4 {
  margin-left: 2rem !important;
}

.prose {
  min-width: 0;
  padding: 3.5rem 1.6rem 5rem;
}

.prose h1 {
  margin-bottom: 1rem;
  font-size: clamp(2.15rem, 4vw, 3.25rem);
}

.prose h2 {
  margin: 2.2rem 0 0.85rem;
  padding-bottom: 0.45rem;
  color: var(--fg);
  border-bottom: 1px solid var(--border);
  font-size: 1.44rem;
  scroll-margin-top: 76px;
}

.prose h3 {
  margin: 1.55rem 0 0.6rem;
  color: var(--fg);
  font-size: 1.16rem;
  scroll-margin-top: 76px;
}

.prose .header {
  color: inherit;
}

.prose p,
.prose li {
  color: var(--muted);
  font-size: 1.08rem;
  line-height: 1.76;
}

.prose p + p {
  margin-top: 1rem;
}

.prose ul {
  margin: 0.7rem 0 1rem;
  padding-left: 1.25rem;
}

.callout {
  margin: 1.25rem 0;
  padding: 0.9rem 1rem;
  border: 1px solid rgba(85, 183, 189, 0.24);
  border-left: 3px solid var(--accent);
  background: rgba(85, 183, 189, 0.07);
}

.callout span {
  display: block;
  margin-bottom: 0.35rem;
  color: var(--accent);
  font-family: var(--mono);
  font-size: 0.72rem;
  text-transform: lowercase;
}

.callout p {
  color: var(--fg);
  margin: 0;
}

.code-shell {
  position: relative;
  margin: 1rem 0;
  border: 1px solid var(--border);
  background: #172131;
}

.code-shell::before {
  content: attr(data-language);
  position: absolute;
  top: 0.55rem;
  left: 0.75rem;
  color: var(--dim);
  font-family: var(--mono);
  font-size: 0.7rem;
}

.code-shell pre {
  max-height: 540px;
  overflow: auto;
  padding-top: 1.6rem;
}

.code-shell code {
  display: block;
  padding: 0.8rem 1rem;
  color: #d5d8de;
  border: 0;
  background: transparent;
  font-size: 0.94rem;
  line-height: 1.55;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.code-copy {
  position: absolute;
  top: 0.42rem;
  right: 0.45rem;
  z-index: 1;
  min-width: 3rem;
  padding: 0.18rem 0.45rem;
  color: var(--dim);
  border: 1px solid var(--border2);
  background: rgba(17, 18, 20, 0.72);
  border-radius: 3px;
  font-family: var(--mono);
  font-size: 0.72rem;
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
}

.code-shell:hover .code-copy,
.code-shell:focus-within .code-copy {
  opacity: 1;
  pointer-events: auto;
}

.mc-comment { color: #6e7481; }
.mc-text-literal { color: #81b29a; }
.mc-numeric-literal { color: #e0af68; }
.mc-argument-label { color: #c790a9; }
.mc-identifier { color: #cdced2; }
.mc-operator { color: #63cdcf; }
.mc-punctuation { color: #cdced2; }
.mc-control-flow { color: #bb9af7; }
.mc-non-control-flow-keyword { color: #e08dcd; }
.mc-unknown { color: #cdced2; }
.mc-function-invocation { color: #8ea8ba; font-weight: 400; }
.mc-operator-invocation { color: #a99ac6; font-weight: 400; }

.source-disclosure {
  background: transparent;
}

.source-disclosure summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: center;
  gap: 0.7rem;
  width: 100%;
  min-height: 34px;
  margin: 0;
  padding: 0.32rem 0.55rem;
  color: var(--dim);
  border: 0;
  background: #191a1d;
  font-family: var(--mono);
  font-size: 0.72rem;
  cursor: pointer;
  list-style: none;
}

.source-disclosure summary::-webkit-details-marker {
  display: none;
}

.source-disclosure summary:hover {
  color: var(--fg);
}

.figure-kind {
  color: var(--accent);
}

.figure-file {
  justify-self: end;
  min-width: 0;
  overflow: hidden;
  color: var(--dim);
  text-align: right;
  text-overflow: ellipsis;
  white-space: nowrap;
  text-decoration: underline;
  text-decoration-color: transparent;
  text-underline-offset: 0.18rem;
}

.source-disclosure summary:hover .figure-file {
  color: var(--fg);
  text-decoration-color: var(--dim);
}

.source-disclosure .code-shell {
  margin: 0;
  border: none;
  border-top: 1px solid var(--border);
}

.source-disclosure:not([open]) {
  background: transparent;
}

.math-display {
  margin: 1.2rem 0;
  overflow-x: auto;
  color: var(--fg);
}

.scene-block,
.live-block,
.media-embed {
  margin: 1.4rem 0;
  overflow: visible;
  border: 0;
  background: transparent;
}

.scene-grid {
  display: grid;
  grid-template-columns: 1fr;
}

.scene-media,
.scene-preview {
  min-height: 320px;
  background: #0c0d10;
}

.scene-media {
  display: grid;
  place-items: center;
  padding: 0;
  background: transparent;
}

.scene-media img,
.scene-media video,
.media-embed img,
.media-embed video {
  width: 100%;
}

.scene-preview {
  position: relative;
  overflow: hidden;
  background:
    linear-gradient(90deg, rgba(85,183,189,0.08) 1px, transparent 1px),
    linear-gradient(0deg, rgba(85,183,189,0.08) 1px, transparent 1px),
    #0c0d10;
  background-size: 28px 28px;
}

.axis {
  position: absolute;
  background: rgba(230, 233, 240, 0.16);
}

.axis.x {
  left: 8%;
  right: 8%;
  top: 50%;
  height: 1px;
}

.axis.y {
  top: 12%;
  bottom: 12%;
  left: 50%;
  width: 1px;
}

.curve {
  position: absolute;
  left: 18%;
  right: 18%;
  top: 30%;
  height: 38%;
  border: 2px solid var(--accent);
  border-color: transparent transparent var(--accent) transparent;
  border-radius: 50%;
}

.dot {
  position: absolute;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--accent2);
}

.dot.a {
  left: 28%;
  top: 55%;
}

.dot.b {
  right: 30%;
  top: 38%;
  background: var(--accent3);
}

.live-workbench {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  min-height: 430px;
}

.live-block.has-params .live-workbench {
  grid-template-columns: minmax(0, 1fr);
}

.live-stage {
  position: relative;
  display: grid;
  grid-template-rows: minmax(300px, 1fr) auto;
  min-width: 0;
  background: #08090b;
}

.live-stage canvas {
  width: 100%;
  height: 100%;
  min-height: 300px;
}

.live-status {
  position: absolute;
  top: 0.75rem;
  left: 0.75rem;
  right: 0.75rem;
  min-height: 1.4rem;
  color: var(--dim);
  font-family: var(--mono);
  font-size: 0.78rem;
  pointer-events: none;
}

.live-status.error {
  color: #ffb3b3;
}

.live-timeline {
  display: flex;
  align-items: center;
  gap: 0.44rem;
  min-height: 38px;
  padding: 0.28rem 0.7rem 0.28rem 1rem;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid #0b0c0f;
  background: #111317;
}

.live-timeline button {
  font-family: var(--mono);
  font-size: 0.84rem;
  cursor: pointer;
}

.transport-button {
  width: 24px;
  height: 24px;
  padding: 0;
  display: inline-grid;
  place-items: center;
  color: var(--accent);
  border: 0;
  background: transparent;
}

.transport-button:hover {
  color: var(--accent-hover);
  opacity: 0.9;
}

.transport-icon,
.footer-icon {
  display: block;
  width: 18px;
  height: 18px;
  background-color: currentColor;
  -webkit-mask: var(--icon) center / contain no-repeat;
  mask: var(--icon) center / contain no-repeat;
}

.icon-prev-slide {
  --icon: url("../img/timeline/player-skip-back.svg");
}

.icon-next-slide {
  --icon: url("../img/timeline/player-skip-forward.svg");
}

.icon-play {
  --icon: url("../img/timeline/player-play.svg");
}

.icon-pause {
  --icon: url("../img/timeline/player-pause.svg");
}

.transport-button .icon-pause {
  display: none;
}

.transport-button.is-playing .icon-play {
  display: none;
}

.transport-button.is-playing .icon-pause {
  display: block;
}

.slide-picker {
  position: relative;
  margin-left: 0.18rem;
}

.slide-current {
  min-width: 8rem;
  max-width: 16rem;
  min-height: 25px;
  padding: 0.18rem 0.55rem;
  overflow: hidden;
  text-align: center;
  text-overflow: ellipsis;
  white-space: nowrap;
  color: var(--muted);
  border: 1px solid var(--border2);
  background: #202226;
  border-radius: 3px;
  font-size: 0.88rem;
}

.slide-current:hover,
.live-slides button:hover,
.live-slides button.active {
  color: var(--fg);
  border-color: var(--accent);
}

.timestamp {
  margin-left: auto;
  color: var(--dim);
  font-family: var(--mono);
  font-size: 0.84rem;
}

.live-slides {
  position: absolute;
  left: 0;
  bottom: calc(100% + 0.35rem);
  z-index: 3;
  display: grid;
  min-width: min(22rem, 76vw);
  max-height: 16rem;
  padding: 0.35rem;
  overflow-y: auto;
  border: 1px solid var(--border2);
  background: #14161b;
  box-shadow: 0 14px 34px rgba(0, 0, 0, 0.34);
}

.live-slides[hidden] {
  display: none;
}

.live-slides button {
  min-height: 30px;
  padding: 0.28rem 0.5rem;
  color: var(--muted);
  border: 1px solid transparent;
  background: transparent;
  border-radius: 3px;
  font-family: var(--mono);
  font-size: 0.84rem;
  text-align: left;
  cursor: pointer;
}

.param-panel {
  position: absolute;
  top: 0.55rem;
  left: 0.55rem;
  z-index: 4;
  width: min(14.5rem, calc(100% - 1.1rem));
  max-height: calc(100% - 3.9rem);
  min-width: 0;
  overflow-y: auto;
  border: 1px solid rgba(138, 141, 148, 0.24);
  border-radius: 5px;
  background: rgba(17, 19, 23, 0.52);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.2);
  backdrop-filter: blur(8px);
  opacity: 0.74;
  transition: opacity 0.12s, background 0.12s, border-color 0.12s;
}

.param-panel:hover,
.param-panel:focus-within {
  opacity: 1;
  border-color: rgba(138, 141, 148, 0.44);
  background: rgba(17, 19, 23, 0.82);
}

.param-list {
  display: grid;
  gap: 0.2rem;
  padding: 0.44rem 0.5rem 0.48rem;
}

.param-row {
  display: grid;
  gap: 0.12rem;
  padding: 0.08rem 0 0.22rem;
  border: 0;
  background: transparent;
}

.param-row + .param-row {
  padding-top: 0.22rem;
}

.param-row-top {
  display: flex;
  justify-content: space-between;
  gap: 0.4rem;
  align-items: baseline;
}

.param-row strong {
  min-width: 0;
  color: var(--fg);
  font-size: 0.8rem;
  line-height: 1.15;
  overflow-wrap: anywhere;
}

.param-row small {
  color: var(--dim);
  font-family: var(--mono);
  font-size: 0.68rem;
}

.param-row input {
  width: 100%;
  min-height: 14px;
  color: var(--fg);
  border: 1px solid var(--border2);
  background: #11141a;
  border-radius: 3px;
  font-family: var(--mono);
  font-size: 0.78rem;
}

.param-row input[type="range"] {
  --range-progress: 50%;
  height: 12px;
  border: 0;
  background: transparent;
  cursor: pointer;
  appearance: none;
  -webkit-appearance: none;
}

.param-row input[type="range"]::-webkit-slider-runnable-track {
  height: 4px;
  border: 1px solid #8a8d94;
  border-radius: 999px;
  background: linear-gradient(
    to right,
    var(--control-blue) 0 var(--range-progress),
    #d8d8d8 var(--range-progress) 100%
  );
}

.param-row input[type="range"]::-webkit-slider-thumb {
  width: 12px;
  height: 12px;
  margin-top: -5px;
  border: 2px solid #111317;
  border-radius: 50%;
  background: #eef0f5;
  appearance: none;
  -webkit-appearance: none;
}

.param-row input[type="range"]::-moz-range-track {
  height: 4px;
  border: 1px solid #8a8d94;
  border-radius: 999px;
  background: #d8d8d8;
}

.param-row input[type="range"]::-moz-range-progress {
  height: 4px;
  border-radius: 999px;
  background: var(--control-blue);
}

.param-row input[type="range"]::-moz-range-thumb {
  width: 12px;
  height: 12px;
  border: 2px solid #111317;
  border-radius: 50%;
  background: #eef0f5;
}

.param-row.locked {
  opacity: 0.62;
}

.param-row.locked strong,
.param-row.locked .param-value {
  color: var(--dim);
}

.param-row input[type="text"] {
  padding: 0.18rem 0.32rem;
}

.param-row input:disabled {
  color: var(--dim);
  opacity: 0.76;
  cursor: not-allowed;
}

.param-row input[type="range"]:disabled {
  cursor: not-allowed;
}

.param-row input[type="range"]:disabled::-webkit-slider-runnable-track {
  background: linear-gradient(
    to right,
    #59616e 0 var(--range-progress),
    #8a8d94 var(--range-progress) 100%
  );
}

.param-row input[type="range"]:disabled::-webkit-slider-thumb {
  background: #9aa0aa;
}

.param-row input[type="range"]:disabled::-moz-range-progress {
  background: #59616e;
}

.param-row input[type="range"]:disabled::-moz-range-track {
  background: #8a8d94;
}

.param-row input[type="range"]:disabled::-moz-range-thumb {
  background: #9aa0aa;
}

.param-value {
  color: var(--dim);
  font-family: var(--mono);
  font-size: 0.78rem;
  text-align: right;
}

.empty-note {
  color: var(--dim) !important;
  font-size: 0.84rem !important;
  line-height: 1.5 !important;
}

.footer-buttons {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.7rem;
  margin-top: 2rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border);
}

.footer-button {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  justify-content: flex-start;
  min-height: 42px;
  padding: 0.55rem 0.75rem;
  color: var(--muted);
  border: 1px solid var(--border);
  background: var(--surface);
  font-size: 0.85rem;
  text-align: left;
}

.footer-button.next {
  justify-content: flex-end;
  text-align: right;
}

.footer-button.next .footer-icon {
  order: 2;
}

.footer-button span:last-child {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
}

.footer-icon {
  flex: none;
  width: 20px;
  height: 20px;
}

.footer-button-spacer {
  display: block;
}

.footer-button:hover {
  color: var(--fg);
  border-color: var(--accent);
}

@media (max-width: 1180px) {
  .reading-frame {
    grid-template-columns: 230px minmax(0, 1fr);
  }

  .toc-panel {
    display: none;
  }
}

@media (max-width: 860px) {
  .topbar {
    grid-template-columns: 1fr auto;
  }

  .top-links {
    display: none;
  }

  .home-page,
  .wide-page {
    padding-inline: 1rem;
  }

  .home-hero {
    min-height: 430px;
    border-inline: 0;
  }

  .home-hero > * {
    width: 100%;
    margin-left: 0;
  }

  .card-grid,
  .card-grid.two,
  .lesson-map,
  .live-workbench {
    grid-template-columns: 1fr;
  }

  .live-block.has-params .live-workbench {
    grid-template-columns: 1fr;
  }

  .essay-row {
    grid-template-columns: 1fr;
    gap: 0.25rem;
  }

  .series-card {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .reading-frame {
    display: block;
  }

  .essay-frame {
    display: block;
    padding: 0;
  }

  .essay-sidebar {
    position: static;
    height: auto;
    padding: 1rem;
    border-bottom: 1px solid var(--border);
  }

  .sidebar,
  .related-panel {
    position: static;
    height: auto;
    border-right: 0;
    border-bottom: 1px solid var(--border);
  }

  .side-nav {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .side-nav p,
  .side-nav small {
    display: none;
  }

  .prose {
    padding: 2rem 1rem 4rem;
  }

  .live-stage {
    border-left: 0 !important;
    border-bottom: 1px solid var(--border);
  }

  .footer-buttons {
    grid-template-columns: 1fr;
  }
}