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

[hidden] {
  display: none !important;
}

html {
  font-size: 112.5%;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

@media (prefers-reduced-motion: no-preference) {
  html {
    scroll-behavior: smooth;
  }
}

body {
  --gutter: clamp(var(--space-l), 6vw, var(--space-4xl));
  margin: 0;
  font-family: var(--font-text);
  font-size: var(--step-0);
  line-height: 1.8;
  color: var(--ink);
  background-color: var(--bg);
  background-image: var(--texture);
}

h1, h2, h3, p, figure, blockquote, dl, dd, ul, ol {
  margin: 0;
}

ul[role="list"], ol[role="list"] {
  padding: 0;
  list-style: none;
}

h2 {
  font-family: var(--font-display);
  font-size: var(--step-2);
  font-weight: 400;
  line-height: 1.25;
  text-wrap: balance;
}

h3 {
  font-size: var(--step-0);
  font-weight: 700;
  line-height: 1.3;
}

p {
  text-wrap: pretty;
}

code {
  font-family: var(--font-text);
  font-variant-numeric: tabular-nums;
}

a {
  color: var(--ink);
  text-decoration-line: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: .2em;
  transition: text-shadow var(--dur-micro) var(--ease-out), text-decoration-thickness var(--dur-micro) var(--ease-out);
}

a:hover, a.is-hover {
  text-shadow: var(--fringe);
  text-decoration-thickness: 2px;
}

:focus-visible, .is-focus {
  outline: 2px solid var(--ink);
  outline-offset: 3px;
}

.visually-hidden, .control-label, .index__label {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  top: var(--space-m);
  left: var(--space-m);
  z-index: 10;
  padding: var(--space-s) var(--space-m);
  color: var(--bg);
  background: var(--ink);
  transform: translateY(-300%);
}

.skip-link:focus-visible {
  transform: none;
}

.site-header, .hero, .section, .site-footer {
  width: min(100% - 2 * var(--gutter), 72rem);
  margin-inline: auto;
}

.site-header {
  display: grid;
  gap: var(--space-xs);
  padding-block: var(--space-l) var(--space-m);
}

.site-header__row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-s) var(--space-l);
}

.brand {
  font-weight: 700;
  line-height: 1.3;
}

.brand__kanji {
  margin-left: var(--space-xs);
  font-family: var(--font-display);
  font-weight: 400;
}

.header-controls {
  display: none;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-s);
}

.has-js .header-controls {
  display: flex;
}

.segmented {
  display: inline-flex;
  border: 1px solid var(--ink);
  border-radius: 2px;
}

.segmented__option, .switch {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  min-width: 44px;
  min-height: 44px;
  padding: 0 var(--space-xs);
  font: inherit;
  line-height: 1;
  color: var(--ink);
  background: transparent;
  cursor: pointer;
  transition: text-shadow var(--dur-micro) var(--ease-out);
}

.segmented__option {
  border: 0;
  border-radius: 0;
}

.segmented__option + .segmented__option {
  border-left: 1px solid var(--ink);
}

.switch {
  border: 1px solid var(--ink);
  border-radius: 2px;
}

.segmented__option [lang="ja"], .switch [lang="ja"] {
  font-family: var(--font-display);
  font-weight: 400;
}

.segmented__option[aria-pressed="true"] {
  font-weight: 700;
  text-decoration: underline 2px;
  text-underline-offset: .3em;
}

.segmented__option:hover, .switch:hover {
  text-shadow: var(--fringe);
}

.lamp {
  width: 12px;
  height: 12px;
  box-sizing: border-box;
  border: 2px solid currentColor;
  border-radius: 50%;
}

.switch[aria-pressed="true"] .lamp {
  border-width: 6px;
}

.index__list {
  display: flex;
  flex-wrap: wrap;
  margin-inline: calc(var(--space-xs) * -1);
}

.index__link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  min-width: 44px;
  min-height: 44px;
  padding-inline: var(--space-xs);
  text-decoration: none;
}

.index__link [lang="ja"] {
  font-family: var(--font-display);
  font-size: var(--step-1);
  line-height: 1;
}

.index__label {
  font-size: var(--step--1);
  letter-spacing: .04em;
}

@media (min-width: 48em) {
  .control-label {
    position: static;
    width: auto;
    height: auto;
    margin: 0;
    overflow: visible;
    clip-path: none;
    white-space: normal;
  }
}

@media (min-width: 64em) {
  .index__label {
    position: static;
    width: auto;
    height: auto;
    margin: 0;
    overflow: visible;
    clip-path: none;
    white-space: normal;
  }
}

.hero {
  display: grid;
  gap: var(--space-l);
  padding-block: var(--space-2xl) var(--space-4xl);
}

.hero__body {
  display: grid;
  gap: var(--space-l);
  min-width: 0;
}

.lead {
  max-width: 26em;
  font-size: var(--step-1);
  line-height: 1.6;
}

.gloss {
  display: grid;
  gap: var(--space-xs);
  max-width: 36em;
}

.gloss__entry {
  display: flex;
  flex-wrap: wrap;
  gap: 0 var(--space-s);
}

.gloss dt [lang] {
  font-family: var(--font-display);
}

.gloss dd {
  color: var(--ink-2);
}

.dna__strip {
  display: block;
  width: 100%;
  height: var(--space-2xl);
}

.hud {
  display: none;
}

.hud__set {
  display: grid;
  gap: var(--space-xs);
}

.hud__set--luz, [data-theme="luz"] .hud__set--papel, [data-signal="off"] #hud-clock {
  display: none;
}

[data-theme="luz"] .hud__set--luz {
  display: grid;
}

.section {
  display: grid;
  gap: var(--space-m);
  padding-block: var(--space-3xl);
}

.section__kanji {
  font-family: var(--font-display);
  font-size: var(--step-3);
  line-height: 1;
}

.section__body {
  display: grid;
  gap: var(--space-l);
  min-width: 0;
  max-width: 40rem;
}

.section__body > p {
  max-width: 36em;
}

@media (min-width: 48em) {
  .hero {
    grid-template-columns: minmax(0, 1fr) auto;
    column-gap: var(--space-xl);
  }

  .hud {
    display: grid;
    align-content: start;
    gap: var(--space-xs);
    font-size: var(--step--1);
    line-height: 1.5;
    letter-spacing: .04em;
    font-variant-numeric: tabular-nums;
    text-align: right;
    color: var(--ink-2);
  }

  .section {
    grid-template-columns: var(--space-4xl) minmax(0, 40rem);
    column-gap: var(--space-xl);
    padding-block: var(--space-4xl);
  }

  .section__kanji {
    writing-mode: vertical-rl;
  }
}

.site-footer {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--space-m);
  padding-block: var(--space-4xl) var(--space-2xl);
}

.site-footer__end {
  font-family: var(--font-display);
  font-size: var(--step-5);
  line-height: 1;
}

.site-footer__note {
  font-size: var(--step--1);
  color: var(--ink-2);
}

.corners {
  position: fixed;
  inset: var(--space-s);
  z-index: 5;
  pointer-events: none;
  color: var(--ink-2);
}

.corner {
  --stroke: 1px;
  position: absolute;
  width: 16px;
  height: 16px;
  border: 0 solid currentColor;
}

[data-theme="luz"] .corner {
  --stroke: 2px;
}

.corner--tl {
  top: 0;
  left: 0;
  border-top-width: var(--stroke);
  border-left-width: var(--stroke);
}

.corner--tr {
  top: 0;
  right: 0;
  border-top-width: var(--stroke);
  border-right-width: var(--stroke);
}

.corner--bl {
  bottom: 0;
  left: 0;
  border-bottom-width: var(--stroke);
  border-left-width: var(--stroke);
}

.corner--br {
  right: 0;
  bottom: 0;
  border-right-width: var(--stroke);
  border-bottom-width: var(--stroke);
}

[data-theme="papel"] .corner::after {
  content: "";
  position: absolute;
  width: 1px;
  height: 8px;
  background: currentColor;
}

[data-theme="papel"] :is(.corner--tl, .corner--tr)::after {
  bottom: 100%;
  margin-bottom: 3px;
}

[data-theme="papel"] :is(.corner--bl, .corner--br)::after {
  top: 100%;
  margin-top: 3px;
}

[data-theme="papel"] :is(.corner--tl, .corner--bl)::after {
  left: 7px;
}

[data-theme="papel"] :is(.corner--tr, .corner--br)::after {
  right: 7px;
}

.title {
  position: relative;
  width: max-content;
  max-width: 100%;
  font-family: var(--font-display);
  font-size: clamp(var(--step-5), 30vw, var(--step-8));
  font-weight: 400;
  line-height: .9;
}

.plate {
  display: block;
  color: var(--plate-color);
  mix-blend-mode: var(--plate-blend);
  transform: translate(var(--dx, 0mm), var(--dy, 0mm));
  -webkit-user-select: none;
  user-select: none;
}

.plate:not(.plate--1) {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.plate--1 {
  --plate-color: var(--plate-1);
}

.plate--2 {
  --plate-color: var(--plate-2);
  --dx: -0.4mm;
}

.plate--3 {
  --plate-color: var(--plate-3);
  --dx: 0.3mm;
  --dy: 0.15mm;
}

.plate--4 {
  --plate-color: var(--plate-4);
  --dx: 0.15mm;
  --dy: 0.4mm;
}

[data-theme="luz"] .plate--3 {
  --dx: 0mm;
  --dy: 0.1mm;
}

[data-theme="luz"] .plate--4 {
  --dx: 0.4mm;
  --dy: 0mm;
}

.title.is-glitching .plate--1 {
  --dx: 2px;
}

.title.is-glitching .plate:not(.plate--1) {
  animation: glitch-slice var(--dur-glitch) steps(1, end);
}

@keyframes glitch-slice {
  0% {
    transform: translate(calc(var(--dx, 0mm) * 4), calc(var(--dy, 0mm) * 4));
  }

  50%, 100% {
    clip-path: inset(38% 0 36% 0);
    transform: translate(calc(var(--dx, 0mm) * 4 + 6px), calc(var(--dy, 0mm) * 4)) skewX(-6deg);
  }
}

.dna {
  display: grid;
  gap: var(--space-xs);
}

.dna__strip {
  fill: var(--ink);
}

[data-signal="on"] .dna__strip {
  animation: breathe 2.4s steps(1, end) infinite;
}

[data-signal="on"] .dna__strip.is-printing {
  animation: print var(--dur-print) var(--ease-jo-ha-kyu) both;
}

.dna__caption {
  font-size: var(--step--1);
  line-height: 1.5;
  letter-spacing: .04em;
  word-spacing: .3em;
  font-variant-numeric: tabular-nums;
  color: var(--ink-2);
}

@keyframes breathe {
  0%, 44%, 72%, 100% {
    opacity: .95;
  }

  42% {
    opacity: .55;
  }

  71% {
    opacity: .75;
  }
}

@keyframes print {
  from {
    clip-path: inset(0 100% 0 0);
  }

  to {
    clip-path: inset(0);
  }
}

@media (forced-colors: active) {
  .plate {
    mix-blend-mode: normal;
  }

  .plate:not(.plate--1) {
    display: none;
  }
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 var(--space-l);
  font: inherit;
  line-height: 1.2;
  border: 1px solid var(--ink);
  border-radius: 2px;
  cursor: pointer;
  transition: text-shadow var(--dur-micro) var(--ease-out);
}

.button--primary {
  color: var(--bg);
  background: var(--ink);
}

.button--secondary {
  color: var(--ink);
  background: transparent;
}

.button:hover, .button.is-hover {
  text-shadow: var(--fringe);
}

.button:active, .button.is-active {
  transform: translateY(1px);
}

.button:disabled {
  opacity: .45;
  cursor: not-allowed;
  text-shadow: none;
  transform: none;
}

html:not(.has-js) #motion-play {
  display: none;
}

.tag {
  display: inline-block;
  padding: 0 .35em;
  border: 1px solid currentColor;
  border-radius: 2px;
  font-size: var(--step--1);
  line-height: 1.5;
  letter-spacing: .04em;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.tag--decor {
  color: var(--ink-2);
}

.note {
  font-size: var(--step--1);
  color: var(--ink-2);
}

.epigraph {
  display: grid;
  gap: var(--space-xs);
  padding-left: var(--space-l);
}

.epigraph [lang="en"] {
  font-family: var(--font-display);
  font-size: var(--step-1);
  line-height: 1.5;
}

.epigraph figcaption {
  display: grid;
  gap: var(--space-xs);
  font-size: var(--step--1);
  color: var(--ink-2);
}

.swatches, .triads {
  display: grid;
  gap: var(--space-l);
}

.swatch {
  display: grid;
  grid-template-columns: var(--space-2xl) minmax(0, 1fr);
  gap: var(--space-xs) var(--space-m);
  align-items: start;
}

.swatch__chip {
  display: block;
  width: var(--space-2xl);
  aspect-ratio: 1;
  border: 1px solid var(--line);
  forced-color-adjust: none;
}

.swatch .swatch__chip {
  grid-row: span 3;
}

.swatch__name {
  font-family: var(--font-display);
  font-size: var(--step-1);
  line-height: 1.2;
}

.swatch__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-xs) var(--space-s);
  font-size: var(--step--1);
}

.swatch__note {
  font-size: var(--step--1);
  line-height: 1.6;
  color: var(--ink-2);
}

.triad {
  display: grid;
  align-content: start;
  gap: var(--space-s);
}

.triad__title {
  display: flex;
  align-items: baseline;
  gap: var(--space-s);
  font-weight: 400;
}

.triad__active {
  display: none;
}

[data-theme="papel"] [data-triad="papel"] .triad__title,
[data-theme="luz"] [data-triad="luz"] .triad__title {
  font-weight: 700;
}

[data-theme="papel"] [data-triad="papel"] .triad__active,
[data-theme="luz"] [data-triad="luz"] .triad__active {
  display: block;
}

.triad__list {
  display: grid;
  gap: var(--space-xs);
}

.triad__item {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-s);
  font-size: var(--step--1);
}

.triad__item .swatch__chip {
  width: var(--space-l);
}

.triad__source {
  font-size: var(--step--1);
  color: var(--ink-2);
}

@media (min-width: 40em) {
  .swatches, .triads {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.ladder {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: var(--space-s) var(--space-m);
}

.ladder__step {
  display: grid;
  justify-items: center;
  gap: var(--space-xs);
}

.ladder__glyph {
  font-family: var(--font-display);
  line-height: 1;
}

.ladder__value, .spacing__step {
  font-size: var(--step--1);
  font-variant-numeric: tabular-nums;
  color: var(--ink-2);
}

.specimen--mincho {
  max-width: 20em;
  font-family: var(--font-display);
  font-size: var(--step-2);
  line-height: 1.35;
}

.specimen--gothic {
  font-variant-numeric: tabular-nums;
}

.tategaki {
  display: grid;
  justify-items: start;
  gap: var(--space-m);
  min-width: 0;
}

.tategaki__text {
  font-family: var(--font-display);
  font-size: var(--step-3);
  line-height: 1.5;
  letter-spacing: .12em;
  writing-mode: vertical-rl;
}

.tategaki figcaption {
  max-width: 30em;
  font-size: var(--step--1);
  color: var(--ink-2);
}

@media (min-width: 40em) {
  .tategaki {
    grid-template-columns: auto minmax(0, 1fr);
    align-items: end;
  }
}

.spacing {
  display: grid;
  gap: var(--space-xs);
}

.spacing__step {
  display: grid;
  grid-template-columns: 7em minmax(0, 1fr);
  align-items: center;
  gap: var(--space-s);
}

.spacing__label {
  display: flex;
  justify-content: space-between;
  gap: var(--space-xs);
}

.spacing__bar {
  display: block;
  height: var(--space-xs);
  background: var(--ink);
}

.curve__plot {
  display: block;
  width: 100%;
  max-width: 30rem;
  height: auto;
}

.curve__phase {
  fill: var(--line);
}

.curve__phase--jo {
  opacity: .12;
}

.curve__phase--ha {
  opacity: .22;
}

.curve__phase--kyu {
  opacity: .36;
}

.curve__axis {
  stroke: var(--ink-2);
  stroke-width: 1;
}

.curve__line {
  fill: none;
  stroke: var(--ink);
  stroke-width: 2;
}

.curve__label {
  font-family: var(--font-display);
  font-size: 12px;
  fill: var(--ink-2);
}

.demo {
  display: grid;
  justify-items: start;
  gap: var(--space-m);
}

.demo__tracks {
  display: grid;
  gap: var(--space-s);
  width: 100%;
}

.demo__track {
  position: relative;
  height: var(--space-2xl);
  border-bottom: 1px solid var(--line);
  container-type: inline-size;
}

.demo__block {
  position: absolute;
  bottom: var(--space-xs);
  left: 0;
  width: var(--space-l);
  height: var(--space-l);
  background: var(--ink);
}

.demo__label {
  position: absolute;
  top: 0;
  left: calc(var(--space-l) + var(--space-s));
  font-size: var(--step--1);
  line-height: 1.5;
  color: var(--ink-2);
}

.demo.is-running .demo__block {
  animation: demo-run var(--dur-print) both;
}

.demo.is-running .demo__track--jhk .demo__block {
  animation-timing-function: var(--ease-jo-ha-kyu);
}

.demo.is-running .demo__track--out .demo__block {
  animation-timing-function: var(--ease-out);
}

.demo.is-running .demo__track--linear .demo__block {
  animation-timing-function: linear;
}

@keyframes demo-run {
  to {
    transform: translateX(calc(100cqw - var(--space-l)));
  }
}

.kata {
  display: grid;
  gap: var(--space-xl);
}

.kata__group {
  display: grid;
  gap: var(--space-s);
}

.kata__row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-m) var(--space-l);
}

.kata__item {
  display: grid;
  justify-items: start;
  gap: var(--space-xs);
}

.kata__state {
  font-size: var(--step--1);
  color: var(--ink-2);
}

.sources {
  display: grid;
  gap: var(--space-s);
}

.sources ul {
  display: grid;
  gap: var(--space-xs);
  padding-left: 1.2em;
}

.sources h3:not(:first-child) {
  margin-top: var(--space-m);
}

@media (forced-colors: active) {
  .spacing__bar, .demo__block {
    background: CanvasText;
  }

  .dna__strip, .curve__label {
    fill: CanvasText;
  }

  .curve__line, .curve__axis {
    stroke: CanvasText;
  }
}

@media (prefers-reduced-motion: reduce) {
  *, ::before, ::after {
    animation: none !important;
    transition: none !important;
  }

  .demo {
    display: none;
  }
}

::view-transition {
  background: var(--sumi);
}

::view-transition-old(root), ::view-transition-new(root) {
  mix-blend-mode: normal;
  animation-fill-mode: both;
}

::view-transition-old(root) {
  animation-name: tv-off;
  animation-duration: var(--dur-switch-out);
  animation-timing-function: var(--ease-jo-ha-kyu);
}

::view-transition-new(root) {
  animation-name: tv-on;
  animation-duration: var(--dur-switch-in);
  animation-timing-function: var(--ease-out);
  animation-delay: var(--dur-switch-out);
}

@keyframes tv-off {
  to {
    transform: scaleY(.004);
  }
}

@keyframes tv-on {
  from {
    transform: scaleY(.004);
  }
}