styles.css

:root {
  --bg: #ffffff;
  --fg: #050505;
  --muted: #6b6b6b;
  --line: #dedede;
  --soft: #f5f5f5;
  --active: #050505;
  --active-fg: #ffffff;
  --ok: #0b6b3a;
  --bad: #a11313;
  --focus: #111111;
  --shadow: 0 14px 60px rgba(0, 0, 0, 0.08);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

:root[data-theme="dark"] {
  --bg: #050505;
  --fg: #f7f7f7;
  --muted: #9b9b9b;
  --line: #2b2b2b;
  --soft: #111111;
  --active: #f7f7f7;
  --active-fg: #050505;
  --ok: #63d297;
  --bad: #ff7474;
  --focus: #f7f7f7;
  --shadow: 0 14px 60px rgba(0, 0, 0, 0.32);
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  background: var(--bg);
  color: var(--fg);
}

body {
  min-height: 100vh;
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  transition:
    background-color 220ms ease,
    color 220ms ease;
}

button,
input {
  font: inherit;
}

.shell {
  min-height: 100vh;
  padding: clamp(18px, 4vw, 54px);
}

.console {
  display: flex;
  flex-direction: column;
  gap: clamp(18px, 3vw, 34px);
  min-height: calc(100vh - clamp(36px, 8vw, 108px));
}

.entry {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto auto;
  align-items: center;
  gap: clamp(10px, 2vw, 22px);
}

.prompt {
  color: var(--muted);
  font-size: clamp(2.5rem, 7vw, 7rem);
  line-height: 1;
  transform: translateY(-0.03em);
}

.input-wrap {
  position: relative;
  display: flex;
  min-width: 0;
  isolation: isolate;
}

.prefix-input {
  appearance: none;
  display: block;
  width: 100%;
  min-width: 0;
  border: 0;
  border-bottom: 2px solid var(--line);
  border-radius: 0;
  padding: 0.05em 0 0.18em;
  background: transparent;
  color: var(--fg);
  caret-color: var(--fg);
  font-size: clamp(2rem, 5.8vw, 6.4rem);
  font-weight: 700;
  line-height: 0.96;
  letter-spacing: 0;
  outline: none;
  overflow: hidden;
  overflow-wrap: normal;
  resize: none;
  white-space: pre-wrap;
  transition:
    border-color 180ms ease,
    text-shadow 180ms ease,
    color 180ms ease;
}

.prefix-input::-webkit-calendar-picker-indicator {
  display: none !important;
}

.prefix-input:focus {
  border-color: var(--focus);
}

.prefix-input.typing {
  animation: tty-pop 180ms ease;
  text-shadow: 1px 0 0 var(--fg);
}

.ghost {
  position: absolute;
  inset: 0 0 auto 0;
  z-index: -1;
  overflow: hidden;
  padding: 0.05em 0 0.18em;
  color: var(--muted);
  font-size: clamp(2rem, 5.8vw, 6.4rem);
  font-weight: 700;
  line-height: 0.96;
  opacity: 0.28;
  pointer-events: none;
  overflow-wrap: normal;
  white-space: pre-wrap;
}

.ghost-prefix {
  color: transparent;
}

.prefix-nav {
  display: grid;
  --nav-button-inline: 58px;
  --nav-button-block: 38px;
  --nav-gap: 2px;
  --nav-center-gap: 2px;
  --nav-triangle-inline-depth: calc((var(--nav-button-inline) + var(--nav-gap) + var(--nav-gap) - var(--nav-center-gap)) / 2);
  --nav-triangle-block-depth: calc((var(--nav-button-block) + var(--nav-gap) + var(--nav-gap) - var(--nav-center-gap)) / 2);
  grid-template-columns: repeat(3, var(--nav-button-inline));
  grid-template-rows: repeat(3, var(--nav-button-block));
  grid-template-areas:
    ". up ."
    "left . right"
    ". down .";
  gap: var(--nav-gap);
  align-self: center;
}

.nav-button {
  display: grid;
  position: relative;
  min-width: 0;
  place-items: center;
  border: 1px solid var(--fg);
  background-color: var(--fg);
  color: var(--bg);
  cursor: pointer;
  font-size: clamp(0.72rem, 1.25vw, 0.9rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0;
  white-space: nowrap;
  transition:
    background-color 180ms ease,
    color 180ms ease,
    border-color 180ms ease,
    opacity 180ms ease;
}

.nav-button::after {
  position: absolute;
  display: block;
  background-color: var(--fg);
  content: "";
  pointer-events: none;
  transition: background-color 180ms ease;
}

.nav-button:hover,
.nav-button:focus-visible {
  border-color: var(--fg);
  outline: none;
}

.nav-button:disabled {
  cursor: not-allowed;
  opacity: 0.32;
}

.nav-button--up {
  grid-area: up;
}

.nav-button--up::after {
  top: 100%;
  left: 50%;
  width: var(--nav-button-inline);
  height: var(--nav-triangle-block-depth);
  clip-path: polygon(0 0, 100% 0, 50% 100%);
  transform: translateX(-50%);
}

.nav-button--down {
  grid-area: down;
}

.nav-button--down::after {
  bottom: 100%;
  left: 50%;
  width: var(--nav-button-inline);
  height: var(--nav-triangle-block-depth);
  clip-path: polygon(50% 0, 100% 100%, 0 100%);
  transform: translateX(-50%);
}

.nav-button--left {
  grid-area: left;
}

.nav-button--left::after {
  top: 50%;
  left: 100%;
  width: var(--nav-triangle-inline-depth);
  height: var(--nav-button-block);
  clip-path: polygon(0 0, 100% 50%, 0 100%);
  transform: translateY(-50%);
}

.nav-button--right {
  grid-area: right;
}

.nav-button--right::after {
  top: 50%;
  right: 100%;
  width: var(--nav-triangle-inline-depth);
  height: var(--nav-button-block);
  clip-path: polygon(100% 0, 0 50%, 100% 100%);
  transform: translateY(-50%);
}

.icon-button {
  display: grid;
  width: clamp(42px, 6vw, 62px);
  aspect-ratio: 1;
  place-items: center;
  border: 1px solid var(--line);
  background: var(--bg);
  color: var(--fg);
  cursor: pointer;
  font-size: clamp(1.2rem, 2.5vw, 1.9rem);
  transition:
    background-color 180ms ease,
    color 180ms ease,
    border-color 180ms ease;
}

.icon-button:hover,
.icon-button:focus-visible {
  border-color: var(--fg);
  outline: none;
}

.message {
  min-height: 1.35em;
  color: var(--bad);
  font-size: clamp(0.78rem, 1.6vw, 0.96rem);
}

.workspace {
  display: grid;
  grid-template-columns: minmax(220px, 0.9fr) minmax(0, 1.8fr);
  gap: clamp(16px, 2.4vw, 28px);
  align-items: stretch;
  flex: 1;
}

.prefixes,
.details {
  min-width: 0;
}

.prefixes {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--line);
}

.prefixes header {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 0;
  color: var(--muted);
  font-size: 0.82rem;
  text-transform: uppercase;
}

.prefix-list {
  display: grid;
  grid-auto-rows: minmax(38px, auto);
  gap: 2px;
  min-height: 0;
}

.prefix-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
  width: 100%;
  border: 0;
  padding: 9px 10px;
  background: transparent;
  color: var(--fg);
  cursor: pointer;
  text-align: left;
  transition:
    background-color 160ms ease,
    color 160ms ease;
}

.prefix-item span:first-child {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.prefix-item span:first-child.display-text--wrap-separator {
  text-overflow: clip;
  white-space: normal;
}

.prefix-item span:last-child {
  color: var(--muted);
  font-size: 0.75rem;
  transition: color 160ms ease;
}

.prefix-item:hover,
.prefix-item:focus-visible {
  background: var(--soft);
  outline: none;
}

.prefix-item.active {
  background: var(--active);
  color: var(--active-fg);
}

.prefix-item.previous {
  box-shadow: inset 0 0 0 1px var(--fg);
}

.prefix-item.active span:last-child {
  color: var(--active-fg);
}

.prefix-item.previous span:last-child {
  color: var(--fg);
}

.detail-grid {
  display: grid;
  grid-template-rows: auto auto minmax(92px, auto);
  gap: clamp(14px, 2vw, 20px);
}

.panel {
  border-top: 1px solid var(--line);
  padding-top: 14px;
  opacity: 1;
  transition:
    border-color 180ms ease,
    opacity 180ms ease;
}

.panel.flash {
  opacity: 0.62;
}

.panel-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 14px;
}

h2 {
  margin: 0;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 500;
  text-transform: uppercase;
}

.panel > h2 {
  margin-bottom: 14px;
}

.presentation-control {
  --presentation-index: 0;
  position: relative;
  display: grid;
  grid-template-columns: repeat(4, minmax(44px, 1fr));
  width: min(300px, 38vw);
  min-width: 244px;
  border: 1px solid var(--fg);
  background: var(--bg);
  isolation: isolate;
}

.presentation-control.is-disabled {
  opacity: 0.38;
}

.presentation-indicator {
  position: absolute;
  inset: 3px auto 3px 3px;
  z-index: -1;
  width: calc((100% - 6px) / 4);
  background: var(--fg);
  transform: translateX(calc(var(--presentation-index) * 100%));
  transition: transform 180ms ease;
}

.presentation-option {
  position: relative;
  display: grid;
  min-width: 0;
  min-height: 34px;
  place-items: center;
  border: 0;
  padding: 0 10px;
  background: transparent;
  color: var(--fg);
  cursor: pointer;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0;
  line-height: 1;
  text-transform: uppercase;
  transition:
    color 160ms ease,
    opacity 160ms ease;
}

.presentation-option[aria-checked="true"] {
  color: var(--bg);
}

.presentation-option:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 3px;
}

.presentation-option:disabled {
  cursor: not-allowed;
}

dl {
  display: grid;
  grid-template-columns: minmax(92px, 0.32fr) minmax(0, 1fr);
  gap: 10px clamp(14px, 2vw, 24px);
  margin: 0;
}

dt {
  color: var(--muted);
  font-size: clamp(0.78rem, 1.4vw, 0.95rem);
}

dd {
  min-width: 0;
  margin: 0;
  overflow-wrap: anywhere;
  font-size: clamp(1rem, 2.1vw, 1.5rem);
}

.adjacent-grid {
  position: relative;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  grid-template-areas:
    "parent parent"
    "left right"
    "child-left child-right";
  gap: 12px;
}

.adjacent-button {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 6px;
  width: 100%;
  min-height: 82px;
  border: 1px solid var(--line);
  padding: 12px;
  overflow: visible;
  background: var(--bg);
  color: var(--fg);
  cursor: pointer;
  text-align: left;
  transition:
    border-color 160ms ease,
    background-color 160ms ease,
    box-shadow 160ms ease;
}

.adjacent-button:hover,
.adjacent-button:focus-visible {
  border-color: var(--fg);
  box-shadow: var(--shadow);
  outline: none;
}

.adjacent-button.previous {
  border-color: var(--fg);
  box-shadow: inset 0 0 0 3px var(--fg);
  background: var(--bg);
  color: var(--fg);
}

.adjacent-button.previous span {
  color: var(--fg);
}

.adjacent-button b {
  overflow-wrap: anywhere;
  font-size: clamp(0.98rem, 2vw, 1.32rem);
}

.adjacent-button span {
  color: var(--muted);
  font-size: 0.78rem;
  text-transform: uppercase;
}

.adjacency-map {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

.adjacency-lines {
  display: block;
  width: 100%;
  height: 100%;
  overflow: visible;
}

.adjacency-lines polyline {
  fill: none;
  stroke: var(--muted);
  stroke-dasharray: 3 5;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.5;
  opacity: 0.65;
  vector-effect: non-scaling-stroke;
}

.adjacency-lines polyline.previous {
  stroke: var(--fg);
  stroke-dasharray: 3 5;
  stroke-dashoffset: 8;
  stroke-width: 2;
  opacity: 1;
  animation: previous-line-flow 620ms linear infinite;
}

.adjacency-dot {
  appearance: none;
  position: absolute;
  top: 50%;
  left: 50%;
  width: 10px;
  height: 10px;
  border: 1px solid var(--fg);
  border-radius: 50%;
  padding: 0;
  background: var(--bg);
  box-shadow: 0 0 0 4px var(--bg);
  cursor: pointer;
  opacity: 0.72;
  pointer-events: auto;
  transform: translate(-50%, -50%);
  transition:
    background-color 160ms ease,
    opacity 160ms ease,
    transform 160ms ease;
}

.adjacency-map.has-previous .adjacency-dot {
  background: var(--fg);
  opacity: 1;
}

.adjacency-dot:hover,
.adjacency-dot:focus-visible {
  background: var(--fg);
  outline: none;
  transform: translate(-50%, -50%) scale(1.3);
}

.adjacent-button--parent {
  grid-area: parent;
  justify-items: center;
  justify-self: center;
  text-align: center;
  width: calc((100% - 12px) / 2);
}

.adjacent-button--left {
  grid-area: left;
  justify-self: start;
  width: calc(100% - 32px);
}

.adjacent-button--right {
  grid-area: right;
  justify-items: end;
  justify-self: end;
  text-align: right;
  width: calc(100% - 32px);
}

.adjacent-button--child-left {
  grid-area: child-left;
  justify-self: start;
  width: calc(100% - 32px);
}

.adjacent-button--child-right {
  grid-area: child-right;
  justify-items: end;
  text-align: right;
  justify-self: end;
  width: calc(100% - 32px);
}

.contains-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(82px, auto);
  gap: 12px;
  align-items: center;
}

@keyframes previous-line-flow {
  to {
    stroke-dashoffset: 0;
  }
}

.contains-input {
  min-width: 0;
  border: 1px solid var(--line);
  padding: 13px 12px;
  background: transparent;
  color: var(--fg);
  outline: none;
  transition:
    border-color 160ms ease,
    background-color 160ms ease;
}

.contains-input:focus {
  border-color: var(--fg);
}

.contains-result {
  display: grid;
  min-height: 48px;
  place-items: center;
  border: 1px solid var(--line);
  padding: 0 14px;
  color: var(--muted);
  font-weight: 700;
  text-transform: uppercase;
  transition:
    background-color 180ms ease,
    color 180ms ease,
    border-color 180ms ease;
}

.contains-result.yes {
  border-color: var(--ok);
  color: var(--ok);
}

.contains-result.no,
.contains-result.error {
  border-color: var(--bad);
  color: var(--bad);
}

@keyframes tty-pop {
  0% {
    filter: contrast(1.4);
    transform: translateX(-1px);
  }

  100% {
    filter: contrast(1);
    transform: translateX(0);
  }
}

@media (max-width: 860px) {
  .shell {
    padding: 16px;
  }

  .entry {
    grid-template-columns: auto minmax(0, 1fr) auto auto;
  }

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

  .details,
  .detail-grid {
    display: contents;
  }

  .current {
    order: 1;
  }

  .prefixes {
    order: 3;
  }

  .detail-grid > .panel:not(.current):not(.contains) {
    order: 2;
  }

  .contains {
    order: 4;
  }

  .prefix-list {
    grid-auto-rows: minmax(34px, auto);
  }

  .detail-grid {
    grid-template-rows: none;
  }
}

@media (max-width: 720px) {
  .entry {
    grid-template-columns: auto minmax(0, 1fr) auto;
  }

  .prefix-nav {
    grid-column: 1 / -1;
    grid-row: 2;
    justify-self: center;
    --nav-button-inline: 46px;
    --nav-button-block: 32px;
    --nav-gap: 2px;
    --nav-center-gap: 2px;
  }

  #themeToggle {
    grid-column: 3;
    grid-row: 1;
  }
}

@media (max-width: 560px) {
  .entry {
    grid-template-columns: auto minmax(0, 1fr) auto;
    gap: 8px;
  }

  .prompt {
    font-size: clamp(2rem, 9vw, 3rem);
  }

  .prefix-input,
  .ghost {
    font-size: clamp(1.45rem, 7vw, 2.5rem);
  }

  .panel-heading {
    align-items: start;
    flex-direction: column;
    gap: 10px;
  }

  .presentation-control {
    width: 100%;
    min-width: 0;
  }

  .adjacent-grid,
  .contains-row,
  dl {
    grid-template-columns: 1fr;
  }

  .adjacent-grid {
    grid-template-areas:
      "parent"
      "left"
      "right"
      "child-left"
      "child-right";
  }

  .adjacency-map {
    display: none;
  }

  .adjacent-button--parent {
    width: 100%;
  }

  dt {
    margin-top: 4px;
  }
}