@font-face {
  font-family: "Quicksand";
  src: url("assets/fonts/Quicksand[wght].ttf") format("truetype");
  font-style: normal;
  font-weight: 300 700;
  font-display: swap;
}

@font-face {
  font-family: "Soft Syntax Rounded TC";
  src: url("assets/fonts/SoftSyntaxRoundedTC-subset.woff2") format("woff2");
  font-style: normal;
  font-weight: 400;
  font-display: swap;
}

:root {
  color-scheme: light;
  --font-sans: "Quicksand", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  --canvas: #fbfaff;
  --canvas-subtle: #f2f0fa;
  --surface: #ffffff;
  --ink: #292637;
  --heading: #312d52;
  --muted: #656174;
  --border: #dcd8ec;
  --brand: #6862ce;
  --brand-dark: #514ab5;
  --brand-soft: #c9c5f5;
  --brand-wash: #eeecff;
  --accent: #fddb49;
  --accent-ink: #594900;
  --focus: #514ab5;
  --content-max: 74rem;
  --gutter: clamp(1.15rem, 4vw, 3rem);
}

html:lang(zh-Hant) {
  --font-sans: "Quicksand", "Soft Syntax Rounded TC", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Soft Syntax Rounded TC", monospace;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--canvas);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: clamp(1rem, 0.96rem + 0.16vw, 1.1rem);
  font-synthesis: none;
  line-height: 1.65;
  text-rendering: optimizeLegibility;
}

body::before {
  position: fixed;
  z-index: -1;
  inset: 0;
  background-image: radial-gradient(circle at 1px 1px, rgb(104 98 206 / 9%) 1px, transparent 0);
  background-size: 26px 26px;
  content: "";
  mask-image: linear-gradient(to bottom, black, transparent 34rem);
}

a {
  color: inherit;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

button {
  font: inherit;
}

img,
svg {
  display: block;
}

h1,
h2,
h3,
p,
figure {
  margin-top: 0;
}

h1,
h2,
h3 {
  color: var(--heading);
  font-weight: 650;
  letter-spacing: -0.035em;
  line-height: 1.12;
}

h1 {
  max-width: 12ch;
  margin-bottom: 1.5rem;
  font-size: clamp(2.9rem, 6.6vw, 6.2rem);
  text-wrap: balance;
}

html:lang(zh-Hant) h1 {
  max-width: 10em;
  font-size: clamp(2.65rem, 5.6vw, 5.35rem);
  letter-spacing: -0.02em;
  line-height: 1.16;
}

h2 {
  max-width: 15ch;
  margin-bottom: 1.25rem;
  font-size: clamp(2rem, 3.7vw, 3.75rem);
}

h3 {
  margin-bottom: 0.45rem;
  font-size: clamp(1.2rem, 1.5vw, 1.45rem);
}

p:last-child {
  margin-bottom: 0;
}

::selection {
  background: var(--accent);
  color: var(--accent-ink);
}

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 4px;
}

.page-shell {
  width: min(100% - 2 * var(--gutter), var(--content-max));
  margin-inline: auto;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 0.75rem;
  left: 0.75rem;
  padding: 0.7rem 1rem;
  border-radius: 0.75rem;
  background: var(--heading);
  color: white;
  text-decoration: none;
  transform: translateY(-150%);
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  position: relative;
  z-index: 10;
  border-bottom: 1px solid rgb(220 216 236 / 75%);
  background: rgb(251 250 255 / 92%);
  backdrop-filter: blur(14px);
}

.header-inner {
  display: flex;
  width: min(100% - 2 * var(--gutter), var(--content-max));
  min-height: 5.25rem;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
  margin-inline: auto;
}

.brand,
.header-actions,
.github-link,
.hero-actions,
.footer-brand {
  display: flex;
  align-items: center;
}

.brand {
  min-width: 2.75rem;
  min-height: 2.75rem;
  gap: 0.65rem;
  color: var(--heading);
  font-weight: 700;
  letter-spacing: -0.02em;
  text-decoration: none;
}

.brand img {
  width: 2.5rem;
  height: 2.5rem;
}

.header-actions {
  gap: 0.8rem;
}

.language-link {
  display: inline-flex;
  min-height: 3.1rem;
  align-items: center;
  padding: 0.55rem 0.9rem;
  border: 1px solid var(--border);
  border-radius: 0.85rem;
  background: var(--surface);
  color: var(--brand-dark);
  font-size: 0.86rem;
  font-weight: 700;
  text-decoration: none;
  transition: border-color 160ms ease;
}

.language-link:hover {
  border-color: var(--brand);
}

.github-link {
  min-height: 3.1rem;
  gap: 0.5rem;
  padding: 0.55rem 0.9rem;
  border: 1px solid var(--border);
  border-radius: 0.85rem;
  background: var(--surface);
  color: var(--heading);
  font-size: 0.9rem;
  font-weight: 700;
  text-decoration: none;
  transition: border-color 160ms ease;
}

.github-link:hover {
  border-color: var(--brand);
}

.github-link svg {
  width: 1.25rem;
  fill: currentColor;
}

.hero {
  overflow: hidden;
  padding-block: clamp(4.75rem, 9vw, 8.5rem) clamp(5.5rem, 10vw, 10rem);
}

.hero-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(24rem, 0.86fr);
  align-items: center;
  gap: clamp(3rem, 7vw, 7.5rem);
}

.hero-copy {
  position: relative;
  z-index: 1;
}

.eyebrow {
  margin-bottom: 1.15rem;
  color: var(--brand-dark);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.13em;
  line-height: 1.4;
  text-transform: uppercase;
}

html:lang(zh-Hant) .eyebrow {
  letter-spacing: 0.08em;
}

.hero-intro {
  max-width: 39rem;
  margin-bottom: 2rem;
  color: var(--muted);
  font-size: clamp(1.08rem, 1.5vw, 1.25rem);
}

.hero-actions {
  flex-wrap: wrap;
  gap: 1rem 1.35rem;
}

.button {
  display: inline-flex;
  min-height: 3.5rem;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  padding: 0.75rem 1.25rem;
  border-radius: 0.9rem;
  font-weight: 700;
  text-decoration: none;
  transition: background-color 160ms ease;
}

.button svg {
  width: 1.2rem;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 2;
}

.button-primary {
  background: var(--brand-dark);
  color: white;
}

.button-primary:hover {
  background: #403a9b;
}

.text-link,
.repository-link {
  display: inline-flex;
  min-height: 2.75rem;
  align-items: center;
  font-weight: 700;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.3em;
}

.text-link:hover,
.repository-link:hover {
  color: var(--brand-dark);
}

.mode-summary {
  margin-top: 1.4rem;
  margin-bottom: 0;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.02em;
}

.keeper-stage {
  position: relative;
  min-height: 35rem;
  margin: 0;
  border: 1px solid var(--border);
  border-radius: 3rem 3rem 8rem 3rem;
  background: var(--brand-wash);
  isolation: isolate;
}

.keeper-stage::before {
  position: absolute;
  z-index: -1;
  width: 13rem;
  height: 13rem;
  border: 1px solid rgb(104 98 206 / 30%);
  border-radius: 50%;
  content: "";
  inset: 17% auto auto 10%;
}

.keeper-logo {
  position: absolute;
  z-index: 2;
  width: min(91%, 31rem);
  height: auto;
  inset: 11% -2% auto auto;
  animation: keeper-breathe 5.5s ease-in-out infinite;
}

.syntax-brace {
  position: absolute;
  z-index: 1;
  top: 26%;
  left: 7%;
  color: rgb(104 98 206 / 22%);
  font-family: var(--font-mono);
  font-size: 12rem;
  font-weight: 400;
  line-height: 1;
}

.stage-note {
  position: absolute;
  z-index: 3;
  padding: 0.55rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 0.7rem;
  background: var(--surface);
  color: var(--heading);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  line-height: 1.35;
}

.stage-note-context {
  top: 7%;
  left: -4%;
}

.stage-note-action {
  top: 7%;
  right: -7%;
}

.stage-note-delight {
  bottom: 19%;
  left: 3%;
}

.keeper-stage figcaption {
  position: absolute;
  right: 11%;
  bottom: 7%;
  left: 11%;
  color: var(--brand-dark);
  font-size: 0.82rem;
  font-weight: 700;
  text-align: right;
}

@keyframes keeper-breathe {
  0%,
  100% {
    transform: translateY(0) rotate(-1deg);
  }
  50% {
    transform: translateY(-0.55rem) rotate(0deg);
  }
}

.belief-section,
.visual-language-section,
.modes-section,
.method-section,
.imagery-section,
.demos-section,
.install-section {
  padding-block: clamp(5rem, 9vw, 9rem);
}

.belief-section {
  border-block: 1px solid var(--border);
  background: var(--surface);
}

.belief-layout {
  display: grid;
  grid-template-columns: minmax(16rem, 0.8fr) minmax(22rem, 1.2fr);
  gap: clamp(3rem, 9vw, 9rem);
}

.belief-statement > p {
  max-width: 38rem;
  margin-bottom: 2.5rem;
  color: var(--muted);
  font-size: clamp(1.08rem, 1.5vw, 1.25rem);
}

.principle-lines {
  border-top: 1px solid var(--border);
}

.principle-line {
  display: grid;
  grid-template-columns: 1rem 1fr;
  gap: 1rem;
  padding-block: 1.4rem;
  border-bottom: 1px solid var(--border);
}

.principle-line p {
  margin: 0;
  color: var(--muted);
}

.principle-mark {
  width: 0.75rem;
  height: 0.75rem;
  margin-top: 0.28rem;
  border-radius: 50%;
  background: var(--brand-soft);
}

.principle-mark-accent {
  background: var(--accent);
}

.visual-language-section {
  overflow: hidden;
  background: var(--canvas);
}

.visual-language-intro {
  display: grid;
  grid-template-columns: minmax(18rem, 0.9fr) minmax(22rem, 1.1fr);
  gap: clamp(3rem, 9vw, 9rem);
  align-items: end;
  margin-bottom: clamp(3.5rem, 6vw, 5.5rem);
}

.visual-language-intro h2,
.visual-language-intro > p {
  margin-bottom: 0;
}

.visual-language-intro > p {
  max-width: 37rem;
  color: var(--muted);
}

.language-layers {
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--border);
  list-style: none;
}

.language-layer {
  display: grid;
  grid-template-columns: 3rem minmax(15rem, 0.8fr) minmax(18rem, 1fr) 6rem;
  gap: 2rem;
  min-height: 9rem;
  align-items: center;
  padding-block: 1.5rem;
  border-bottom: 1px solid var(--border);
}

.layer-number {
  color: var(--brand-dark);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 700;
}

.layer-title p {
  margin-bottom: 0.35rem;
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.layer-title h3,
.layer-description {
  margin-bottom: 0;
}

.layer-description {
  color: var(--muted);
}

.layer-cue {
  position: relative;
  display: block;
  width: 5.25rem;
  height: 4.25rem;
  justify-self: end;
}

.language-layer-structure .layer-cue {
  border: 2px solid var(--brand);
  border-radius: 0.85rem;
  background:
    linear-gradient(var(--brand-soft), var(--brand-soft)) 0.7rem 0.75rem / 1.65rem 0.35rem no-repeat,
    linear-gradient(var(--border), var(--border)) 0.7rem 1.55rem / calc(100% - 1.4rem) 1px no-repeat,
    linear-gradient(90deg, transparent 45%, var(--border) 45% 47%, transparent 47%);
}

.language-layer-character .layer-cue {
  border-radius: 48% 52% 44% 56%;
  background: var(--brand-wash);
  transform: rotate(-5deg);
}

.language-layer-character .layer-cue::before {
  position: absolute;
  top: 0.55rem;
  right: 0.45rem;
  width: 1.35rem;
  height: 1.35rem;
  border-radius: 50%;
  background: var(--accent);
  content: "";
}

.language-layer-character .layer-cue::after {
  position: absolute;
  bottom: 1.05rem;
  left: 1.15rem;
  width: 2.15rem;
  height: 0.8rem;
  border-bottom: 2px solid var(--brand);
  border-radius: 50%;
  content: "";
  transform: rotate(6deg);
}

.language-layer-expression .layer-cue {
  border-radius: 1.4rem 0.65rem 1.4rem 0.65rem;
  background: var(--brand);
}

.language-layer-expression .layer-cue::before {
  position: absolute;
  top: 1rem;
  left: 0.9rem;
  width: 2.3rem;
  height: 0.45rem;
  border-radius: 999px;
  background: var(--brand-wash);
  content: "";
}

.language-layer-expression .layer-cue::after {
  position: absolute;
  right: 0.65rem;
  bottom: 0.6rem;
  width: 1.45rem;
  height: 1.45rem;
  border-radius: 50%;
  background: var(--accent);
  content: "";
}

.modes-section {
  background: var(--canvas-subtle);
}

.modes-intro {
  display: grid;
  grid-template-columns: minmax(16rem, 0.85fr) minmax(20rem, 1.15fr);
  gap: 1rem clamp(3rem, 10vw, 10rem);
  margin-bottom: clamp(3.5rem, 6vw, 6rem);
}

.modes-intro .eyebrow {
  grid-column: 1 / -1;
  margin-bottom: 0;
}

.modes-intro h2,
.modes-intro > p:last-child {
  margin-bottom: 0;
}

.modes-intro > p:last-child {
  max-width: 33rem;
  align-self: end;
  color: var(--muted);
}

.mode-list {
  border-top: 1px solid var(--border);
}

.mode-row {
  display: grid;
  grid-template-columns: minmax(8rem, 0.55fr) minmax(16rem, 1fr) minmax(18rem, 1.15fr);
  gap: 2rem;
  align-items: baseline;
  padding-block: 1.7rem;
  border-bottom: 1px solid var(--border);
}

.mode-row > * {
  margin: 0;
}

.mode-row > p:last-child {
  color: var(--muted);
}

.mode-keyword {
  color: var(--brand-dark);
  font-family: var(--font-mono);
  font-size: 0.86rem;
  font-weight: 700;
}

.method-section {
  background: var(--heading);
  color: #efedf7;
}

.method-section h2,
.method-section h3 {
  color: white;
}

.method-section .eyebrow {
  color: var(--brand-soft);
}

.method-layout {
  display: grid;
  grid-template-columns: minmax(18rem, 0.85fr) minmax(25rem, 1.15fr);
  gap: clamp(4rem, 10vw, 10rem);
}

.method-heading {
  position: sticky;
  top: 2rem;
  align-self: start;
}

.method-heading > p:last-child {
  max-width: 31rem;
  color: #c9c5d7;
}

.method-steps {
  margin: 0;
  padding: 0;
  list-style: none;
}

.method-steps li {
  display: grid;
  grid-template-columns: 3rem 1fr;
  gap: 1.25rem;
  padding-block: 1.6rem;
  border-top: 1px solid rgb(255 255 255 / 16%);
}

.method-steps li:last-child {
  border-bottom: 1px solid rgb(255 255 255 / 16%);
}

.method-steps p {
  margin-bottom: 0;
  color: #c9c5d7;
}

.step-number {
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 700;
}

.imagery-section {
  background: var(--surface);
}

.imagery-layout {
  display: grid;
  grid-template-columns: minmax(18rem, 0.9fr) minmax(24rem, 1.1fr);
  gap: clamp(3rem, 9vw, 9rem);
  align-items: end;
}

.imagery-copy > p {
  max-width: 39rem;
  margin-bottom: 2rem;
  color: var(--muted);
}

.imagery-formula {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
  color: var(--brand-dark);
  font-family: var(--font-mono);
  font-size: clamp(0.76rem, 1.3vw, 0.92rem);
}

.imagery-formula span {
  padding: 0.65rem 0.8rem;
  border: 1px solid var(--border);
  border-radius: 0.7rem;
  background: var(--brand-wash);
}

.imagery-formula .formula-focus {
  border-color: #e2bf25;
  background: var(--accent);
  color: var(--accent-ink);
}

.install-section {
  border-top: 1px solid var(--border);
}

.install-panel {
  display: grid;
  grid-template-columns: minmax(19rem, 0.9fr) minmax(24rem, 1.1fr);
  gap: clamp(3rem, 8vw, 7.5rem);
  padding: clamp(2rem, 5vw, 4.5rem);
  border-radius: 2.5rem 2.5rem 6rem 2.5rem;
  background: var(--brand-wash);
}

.install-copy > p:last-child {
  max-width: 34rem;
  color: var(--muted);
}

.install-command-wrap {
  align-self: center;
}

.command-label {
  display: flex;
  min-height: 1.6rem;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.7rem;
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 700;
}

.command-status {
  color: var(--brand-dark);
}

.command-box {
  display: flex;
  min-width: 0;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.75rem 0.75rem 0.75rem 1.2rem;
  border-radius: 1rem;
  background: var(--heading);
  color: white;
}

.command-box code {
  min-width: 0;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: clamp(0.72rem, 1.2vw, 0.88rem);
  white-space: nowrap;
}

.copy-button {
  display: inline-flex;
  min-width: 5.7rem;
  min-height: 2.8rem;
  flex: 0 0 auto;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.45rem 0.7rem;
  border: 0;
  border-radius: 0.7rem;
  background: var(--brand-soft);
  color: #29245f;
  cursor: pointer;
  font-size: 0.8rem;
  font-weight: 700;
  transition: background-color 160ms ease;
}

.copy-button:hover {
  background: white;
}

.copy-button svg {
  width: 1rem;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.8;
}

.repository-link {
  display: inline-flex;
  gap: 0.45rem;
  margin-top: 1.2rem;
  color: var(--heading);
  font-size: 0.9rem;
}

/* ---------- demos section ---------- */

.demos-intro {
  display: grid;
  grid-template-columns: minmax(18rem, 0.9fr) minmax(22rem, 1.1fr);
  gap: clamp(3rem, 9vw, 9rem);
  align-items: end;
  margin-bottom: clamp(3rem, 6vw, 4.5rem);
}

.demos-intro h2,
.demos-intro > p {
  margin-bottom: 0;
}

.demos-intro > p {
  max-width: 37rem;
  color: var(--muted);
}

.demo-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(1.25rem, 2.5vw, 2rem);
  margin: 0;
  padding: 0;
  list-style: none;
}

.demo-card {
  display: block;
  border: 1px solid var(--border);
  border-radius: 1.4rem;
  background: var(--surface);
  overflow: hidden;
  text-decoration: none;
  transition: border-color 160ms ease, box-shadow 160ms ease, transform 160ms ease;
}

.demo-card:hover {
  border-color: var(--brand-soft);
  box-shadow: 0 14px 34px rgb(49 45 82 / 12%);
  transform: translateY(-3px);
}

.demo-thumb {
  display: block;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  border-bottom: 1px solid var(--border);
  background: var(--canvas-subtle);
}

.demo-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top;
}

.demo-card-body {
  display: grid;
  gap: 0.2rem;
  padding: 1.1rem 1.3rem 1.25rem;
}

.demo-card-name {
  color: var(--heading);
  font-weight: 700;
}

.demo-card-domain {
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.78rem;
}

/* ---------- demo detail pages ---------- */

.demo-main {
  padding-block: clamp(3rem, 6vw, 5.5rem) clamp(4rem, 8vw, 7rem);
}

.demo-intro h1 {
  margin-bottom: 1rem;
  font-size: clamp(2.1rem, 4.5vw, 3.9rem);
}

html:lang(zh-Hant) .demo-intro h1 {
  font-size: clamp(1.95rem, 4vw, 3.4rem);
}

.demo-target-line {
  max-width: 44rem;
  margin-bottom: 0.8rem;
  color: var(--muted);
  font-size: clamp(1.02rem, 1.4vw, 1.18rem);
}

.demo-target-line a {
  color: var(--brand-dark);
  text-underline-offset: 0.2em;
}

.demo-notes-link {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  margin-bottom: 1rem;
  color: var(--heading);
  font-size: 0.9rem;
}

.demo-notes-link:hover {
  color: var(--brand-dark);
}

.compare {
  margin-top: clamp(2.5rem, 5vw, 4rem);
}

.compare-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.9rem 1.5rem;
  margin-bottom: 1.1rem;
}

.compare-head h2 {
  margin-bottom: 0;
  font-size: clamp(1.25rem, 2vw, 1.7rem);
}

.compare-toggle {
  display: inline-flex;
  padding: 0.25rem;
  border: 1px solid var(--border);
  border-radius: 0.85rem;
  background: var(--surface);
}

.compare-toggle span {
  display: inline-flex;
  min-height: 2.6rem;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.35rem 1.15rem;
  border-radius: 0.6rem;
  color: var(--muted);
  font-weight: 700;
  font-size: 0.88rem;
  cursor: pointer;
  transition: background-color 160ms ease, color 160ms ease;
}

.compare-view {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.compare-stage {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: 1.4rem;
  background: var(--surface);
}

.compare-stage img {
  display: none;
  width: 100%;
  height: auto;
}

.compare-stage figcaption {
  padding: 0.85rem 1.3rem;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.82rem;
}

.compare-stage-mobile {
  max-height: 74vh;
  overflow-y: auto;
  overscroll-behavior: contain;
}

.compare-stage-mobile img {
  width: min(100%, 24.4rem);
  margin-inline: auto;
}

.compare-view-after:checked ~ .compare-stage .compare-img-after,
.compare-view-before:checked ~ .compare-stage .compare-img-before {
  display: block;
}

.compare-label span:hover {
  color: var(--heading);
}

.compare-view-after:checked ~ .compare-head .compare-label-after span,
.compare-view-before:checked ~ .compare-head .compare-label-before span {
  background: var(--brand-dark);
  color: white;
}

.compare-view:focus-visible ~ .compare-head .compare-toggle {
  outline: 3px solid var(--focus);
  outline-offset: 4px;
}

.site-footer {
  padding-block: 2.4rem;
  border-top: 1px solid var(--border);
  background: var(--surface);
}

.footer-layout {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}

.footer-brand {
  gap: 0.75rem;
}

.footer-brand img {
  width: 2.75rem;
  height: 2.75rem;
}

.footer-brand strong {
  color: var(--heading);
}

.footer-brand p,
.footer-note {
  margin: 0;
  color: var(--muted);
  font-size: 0.82rem;
}

.footer-meta {
  text-align: right;
}

.footer-links {
  display: flex;
  justify-content: flex-end;
  gap: 1rem;
  margin: 0.35rem 0 0;
  font-size: 0.78rem;
}

.footer-links a {
  display: inline-flex;
  min-height: 2.75rem;
  align-items: center;
  color: var(--brand-dark);
  text-underline-offset: 0.2em;
}

@media (max-width: 960px) {
  .hero-layout {
    grid-template-columns: 1fr;
    gap: 4rem;
  }

  .hero-copy {
    max-width: 47rem;
  }

  .keeper-stage {
    width: min(100%, 38rem);
    justify-self: center;
  }

  .belief-layout,
  .visual-language-intro,
  .method-layout,
  .imagery-layout,
  .install-panel,
  .demos-intro {
    grid-template-columns: 1fr;
  }

  .belief-layout,
  .visual-language-intro,
  .imagery-layout,
  .install-panel,
  .demos-intro {
    gap: 2.5rem;
  }

  .method-heading {
    position: static;
  }
}

@media (max-width: 840px) {
  h1 {
    font-size: clamp(2.75rem, 14vw, 4.5rem);
  }

  .modes-intro {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .modes-intro .eyebrow {
    grid-column: auto;
  }

  .mode-row {
    grid-template-columns: 7rem 1fr;
    gap: 0.6rem 1.1rem;
  }

  .language-layer {
    grid-template-columns: 2.75rem minmax(0, 1fr) 5.25rem;
    gap: 0.6rem 1.25rem;
  }

  .layer-description {
    grid-column: 2;
  }

  .layer-cue {
    grid-column: 3;
    grid-row: 1 / span 2;
  }

  .mode-row > p:last-child {
    grid-column: 2;
  }
}

@media (max-width: 540px) {
  .header-inner {
    min-height: 4.75rem;
  }

  .brand-name,
  .github-label {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
    white-space: nowrap;
  }

  .github-link {
    width: 3rem;
    padding-inline: 0;
    justify-content: center;
  }

  .language-link {
    padding-inline: 0.75rem;
  }

  .hero {
    padding-top: 4rem;
  }

  .keeper-stage {
    min-height: 27rem;
    border-radius: 2rem 2rem 5rem 2rem;
  }

  .keeper-logo {
    width: 100%;
    top: 13%;
    right: -5%;
  }

  .stage-note-context {
    left: -2%;
  }

  .stage-note-action {
    top: 17%;
    right: -2%;
  }

  .stage-note-delight {
    bottom: 17%;
  }

  .keeper-stage figcaption {
    right: 9%;
    left: 9%;
  }

  .belief-section,
  .visual-language-section,
  .modes-section,
  .method-section,
  .imagery-section,
  .install-section {
    padding-block: 4.5rem;
  }

  .mode-row {
    grid-template-columns: 1fr;
    padding-block: 1.4rem;
  }

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

  .compare-head {
    align-items: flex-start;
    flex-direction: column;
  }

  .compare-stage {
    border-radius: 1.1rem;
  }

  .language-layer {
    grid-template-columns: 2.5rem minmax(0, 1fr);
    gap: 0.6rem 0.75rem;
    padding-block: 1.75rem;
  }

  .layer-description,
  .layer-cue {
    grid-column: 2;
  }

  .layer-cue {
    grid-row: auto;
    justify-self: start;
    margin-top: 0.75rem;
  }

  .mode-row > p:last-child {
    grid-column: auto;
  }

  .install-panel {
    width: calc(100% - 1.5rem);
    padding: 2rem 1rem;
    border-radius: 2rem 2rem 4rem 2rem;
  }

  .command-box {
    display: block;
    padding: 1rem;
  }

  .command-box code {
    display: block;
    padding-bottom: 0.85rem;
  }

  .copy-button {
    width: 100%;
  }

  .footer-layout {
    align-items: flex-start;
    flex-direction: column;
  }

  .footer-meta {
    text-align: left;
  }

  .footer-links {
    justify-content: flex-start;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}