@font-face {
  font-family: "Google Sans Code";
  src: url("./fonts/GoogleSansCode-VariableFont_wght.woff2") format("woff2");
  font-style: normal;
  font-weight: 300 800;
  font-display: block;
}

@font-face {
  font-family: "Google Sans Code";
  src: url("./fonts/GoogleSansCode-Italic-VariableFont_wght.woff2") format("woff2");
  font-style: italic;
  font-weight: 300 800;
  font-display: block;
}

@font-face {
  font-family: "Merriweather";
  src: url("./fonts/Merriweather-VariableFont_opsz,wdth,wght.woff2") format("woff2");
  font-style: normal;
  font-weight: 300 900;
  font-display: block;
}

@font-face {
  font-family: "Merriweather";
  src: url("./fonts/Merriweather-Italic-VariableFont_opsz,wdth,wght.woff2") format("woff2");
  font-style: italic;
  font-weight: 300 900;
  font-display: block;
}

:root {
  --font-step--2: clamp(0.6rem, 0.56rem + 0.09vw, 0.68rem);
  --font-step--1: clamp(0.72rem, 0.66rem + 0.18vw, 0.86rem);
  --font-step-0: clamp(0.86rem, 0.8rem + 0.24vw, 1rem);
  --font-step-1: clamp(1rem, 0.92rem + 0.34vw, 1.2rem);
  --font-step-2: clamp(1.2rem, 1.02rem + 0.75vw, 1.68rem);
  --font-step-3: clamp(1.6rem, 1.25rem + 1.24vw, 2.52rem);

  --display-font: "Merriweather", "Times New Roman", serif;
  --ui-font: "Google Sans Code", "Courier New", monospace;
  --body-font: "Merriweather", "Times New Roman", serif;

  --bg: #f4f4f4;
  --surface-0: #ffffff;
  --surface-1: #f0f0f0;
  --surface-2: #e6e6e6;
  --surface-3: #d8d8d8;

  --ink: #1b1b1b;
  --ink-soft: #3d3d3d;
  --ink-muted: #6a6a6a;

  --line-strong: #202020;
  --line: #7a7a7a;
  --line-soft: #b5b5b5;

  --focus: #111111;
  --focus-shadow: rgba(0, 0, 0, 0.16);
  --accent-crimson-eink: #a5394f;
  --accent-green-eink: #435a47;
  --accent-blue-eink: #3f5268;
  --accent-green-surface: #edf1ed;
  --accent-blue-surface: #eceff3;
}

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

html,
body {
  min-height: 100%;
  margin: 0;
}

html {
  font-size: clamp(14px, 13px + 0.2vw, 18px);
}

body,
button,
input,
select,
textarea {
  font: inherit;
}

body {
  font-family: var(--body-font);
  color: var(--ink);
  line-height: 1.58;
  background: var(--bg);
  text-rendering: geometricPrecision;
  font-optical-sizing: auto;
}

:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

button,
.slider-rail,
.depth-scroll-thumb,
.example-word,
.definition-action {
  transition: border-color 120ms ease, background 120ms ease, color 120ms ease;
}

.scene {
  width: min(1180px, calc(100vw - 28px));
  margin: 0 auto;
  padding: 10px 0 14px;
}

.playfield {
  display: grid;
}

.site-footer {
  margin-top: 10px;
  text-align: center;
  font-family: var(--ui-font);
  font-size: var(--font-step--2);
  letter-spacing: 0.03em;
  color: var(--ink-muted);
}

.site-footer a {
  color: inherit;
  text-decoration: none;
}

.board-shell {
  border: 1px solid var(--line-strong);
  background: var(--surface-0);
}

.board-top {
  position: relative;
  padding: 10px 12px;
  border-bottom: 1px solid var(--line-strong);
  background: var(--surface-1);
}

.board-intro {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding-right: 48px;
}

.board-wordmark {
  margin: 0;
  position: relative;
  display: inline-block;
  padding-right: 0.42em;
  font-family: var(--display-font);
  font-style: italic;
  font-weight: 700;
  font-size: clamp(1.45rem, 1.18rem + 1.08vw, 2.32rem);
  letter-spacing: -0.02em;
  line-height: 1.02;
  color: var(--ink);
}

.board-wordmark-tm {
  position: absolute;
  top: 0.08em;
  right: 0;
  font-family: var(--ui-font);
  font-style: normal;
  font-weight: 650;
  font-size: 0.24em;
  letter-spacing: 0.03em;
  line-height: 1;
}

.header-actions {
  position: absolute;
  top: 50%;
  right: 12px;
  transform: translateY(-50%);
  z-index: 2;
}

.help-menu {
  position: relative;
}

.help-menu-trigger {
  list-style: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  inline-size: clamp(1.75rem, 1.56rem + 0.62vw, 2.08rem);
  block-size: clamp(1.75rem, 1.56rem + 0.62vw, 2.08rem);
  padding: 0;
  border: 1px solid var(--line);
  background: var(--surface-0);
  color: var(--ink);
  font-family: var(--ui-font);
  font-size: clamp(0.82rem, 0.76rem + 0.2vw, 0.95rem);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  line-height: 1;
  cursor: pointer;
}

.help-menu-trigger::-webkit-details-marker {
  display: none;
}

.help-menu[open] .help-menu-trigger,
.help-menu-trigger:hover,
.help-menu-trigger:focus-visible {
  border-color: var(--line-strong);
  background: var(--surface-1);
}

.help-menu-panel {
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  z-index: 12;
  width: min(420px, 74vw);
  display: grid;
  gap: 8px;
  padding: 10px;
  border: 1px solid var(--line);
  background: var(--surface-0);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.08);
}

.grid-frame {
  display: grid;
  gap: 10px;
  padding: 10px;
}

.status-strip,
.status-metrics,
.slider-card,
.definition-panel,
.banner-note,
.quick-words,
.preview-chip,
.summary-copy {
  border: 1px solid var(--line);
  background: var(--surface-0);
}

.status-strip {
  min-height: 92px;
  padding: 8px;
}

.status-metrics {
  padding: 8px;
}

.status-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
  gap: 8px;
  align-items: start;
}

.status-grid .definition-panel {
  order: 1;
}

.status-grid .summary-copy {
  order: 2;
}

@media (min-width: 1061px) {
  .status-grid {
    grid-template-columns: 1fr;
  }
}

.summary-grid {
  display: grid;
  gap: 8px;
}

.summary-progress {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 6px;
}

.preview-chip {
  display: grid;
  gap: 4px;
  padding: 6px 7px;
  border-color: var(--line-soft);
  background: var(--surface-1);
}

.section-kicker,
.preview-label,
.slider-step,
.slider-status,
.meaning-part {
  margin: 0;
  font-family: var(--ui-font);
  font-size: var(--font-step--2);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink-muted);
  font-weight: 650;
}

.preview-chip strong,
.word-preview,
.definition-action,
.slider-choice {
  font-family: var(--ui-font);
}

.preview-chip strong {
  margin: 0;
  font-size: var(--font-step--1);
  line-height: 1.25;
  color: var(--ink);
  font-weight: 700;
  overflow-wrap: anywhere;
}

.summary-copy {
  display: grid;
  gap: 6px;
  align-content: start;
  padding: 8px;
  border-color: var(--line-soft);
}

.summary-copy--stack {
  align-items: start;
}

.summary-copy--stack .section-kicker {
  color: var(--accent-green-eink);
}

.example-words {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.example-word {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 32px;
  padding: 0.45rem 0.7rem;
  border: 1px solid #70816f;
  background: var(--accent-green-surface);
  color: var(--accent-green-eink);
  font-family: var(--body-font);
  font-size: clamp(0.66rem, 1.6vw, 0.82rem);
  line-height: 1.3;
  font-weight: 600;
  cursor: pointer;
}

.example-word:hover,
.example-word:focus-visible {
  border-color: #556954;
  background: #e5ebe5;
}

.example-word--empty {
  cursor: default;
  opacity: 0.74;
  color: #5d695d;
}

.definition-panel {
  display: grid;
  gap: 6px;
  padding: 9px;
}

.definition-panel--banner {
  grid-template-columns: 1fr;
  align-items: start;
}

.definition-panel--banner .section-kicker {
  grid-column: 1;
}

.definition-panel--banner .definition-head,
.definition-panel--banner .definition-meta,
.definition-panel--banner .definition-origin,
.definition-panel--banner .definition-meanings {
  grid-column: 1;
}

.definition-head {
  display: grid;
  gap: 6px;
}

.definition-panel--banner.has-ipa-row .definition-head {
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
  flex-wrap: nowrap;
  width: fit-content;
}

.definition-panel--banner.has-ipa-row .definition-word,
.definition-panel--banner.has-ipa-row .definition-meta {
  margin: 0;
  white-space: nowrap;
}

.definition-panel--banner.has-ipa-row .definition-meta {
  line-height: 1.2;
  position: relative;
  top: -0.12em;
}

.definition-word {
  margin: 0;
  font-family: var(--display-font);
  font-style: italic;
  font-size: var(--font-step-2);
  line-height: 1.08;
  letter-spacing: -0.01em;
  color: var(--ink);
  overflow-wrap: anywhere;
}

.preview-copy,
.banner-note-copy,
.definition-meta,
.definition-origin,
.meaning-item,
.meaning-example,
.meaning-note,
.quick-words--action span {
  margin: 0;
  font-size: var(--font-step-0);
  line-height: 1.46;
  color: var(--ink-soft);
  overflow-wrap: anywhere;
}

.definition-meanings {
  display: grid;
  gap: 10px;
}

.definition-origin {
  display: grid;
  gap: 10px;
}

.meaning-item {
  display: grid;
  gap: 6px;
  padding: 8px 0 0;
  border-top: 1px solid var(--line-soft);
  background: transparent;
}

.meaning-item--supp {
  margin-top: 2px;
  padding-top: 10px;
}

.meaning-item p {
  margin: 0;
}

.meaning-part {
  color: var(--ink);
}

.meaning-item > .meaning-part {
  text-transform: none;
  letter-spacing: 0;
  font-size: var(--font-step-0);
  font-weight: 620;
}

.meaning-item--supp > .meaning-part {
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-size: var(--font-step--2);
  font-weight: 650;
}

.meaning-list {
  margin: 0;
  padding-left: 1.35rem;
  display: grid;
  gap: 5px;
}

.meaning-list li {
  margin: 0;
  padding-left: 0.1rem;
}

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

.meaning-examples {
  display: block;
  margin-top: 2px;
  color: var(--ink-muted);
  font-style: italic;
}

.supp-list {
  margin: 0;
  padding-left: 1.2rem;
  display: grid;
  gap: 4px;
}

.supp-list li {
  margin: 0;
}

.meaning-example {
  color: var(--ink-soft);
  font-style: italic;
}

.meaning-note {
  color: var(--ink-muted);
}

.definition-origin-text {
  margin: 0;
  color: var(--ink-muted);
}

.banner-note {
  display: grid;
  gap: 8px;
  padding: 12px;
}

.banner-note .section-kicker {
  color: var(--ink);
}

.lookup-layout,
.slider-panel {
  display: grid;
}

.slider-panel {
  gap: 10px;
}

.slider-stage-wrap {
  overflow-x: auto;
  overflow-y: hidden;
  padding-bottom: 4px;
  scrollbar-gutter: stable both-edges;
  overscroll-behavior-x: contain;
}

.slider-stage {
  display: flex;
  gap: 12px;
  min-height: 500px;
  width: max-content;
  min-width: 100%;
  padding-bottom: 8px;
}

.slider-column {
  width: 108px;
  flex: 0 0 108px;
  display: grid;
  gap: 9px;
  scroll-snap-align: center;
}

.slider-meta {
  display: grid;
  gap: 5px;
  justify-items: center;
  text-align: center;
}

.slider-step,
.slider-status {
  font-size: var(--font-step--2);
}

.slider-choice {
  margin: 0;
  min-height: 1.35em;
  font-size: var(--font-step-2);
  line-height: 1.1;
  color: var(--ink);
  font-weight: 760;
  overflow-wrap: anywhere;
}

.slider-choice.is-sproutable,
.slider-column.is-active .slider-choice.is-sproutable {
  color: var(--accent-crimson-eink);
}

.slider-card {
  padding: 6px;
  background: #f5f5f5;
  border-color: var(--line-soft);
}

.slider-column.is-active .slider-card {
  border-color: var(--accent-crimson-eink);
  background: #f8eff1;
}

.slider-column.is-settled .slider-card {
  background: var(--accent-green-surface);
  border-color: #70816f;
}

.slider-column.is-active .slider-choice,
.slider-column.is-active .slider-status,
.slider-column.is-active .slider-step {
  color: var(--accent-crimson-eink);
}

.slider-column.is-settled .slider-step,
.slider-column.is-settled .slider-status {
  color: var(--accent-green-eink);
}

.slider-column:not(.is-settled):not(.is-active) .slider-choice,
.slider-column:not(.is-settled):not(.is-active) .slider-status,
.slider-column:not(.is-settled):not(.is-active) .slider-step {
  color: #787878;
}

.slider-rail {
  position: relative;
  --slider-lane-left: 50%;
  --rail-edge-gap: 15px;
  --rail-track-height: calc(100% - (var(--rail-edge-gap) * 2));
  --rail-step: calc(var(--rail-track-height) / 26);
  height: 396px;
  border: 1px solid var(--line);
  background: var(--surface-0);
  user-select: none;
  touch-action: pan-x;
  overflow: hidden;
}

.slider-column:not(.is-settled):not(.is-active) .slider-rail {
  border-color: var(--line-soft);
  background: #f4f4f4;
}

.slider-column.is-settled .slider-rail {
  border-color: #8ea08d;
  background: #f6faf6;
}

.slider-column.is-active .slider-rail {
  border-color: var(--accent-crimson-eink);
  background: #fffafb;
}

.slider-mark {
  position: absolute;
  left: 0;
  right: 0;
  top: calc(var(--rail-edge-gap) + (var(--letter-index) * var(--rail-step)));
  height: var(--rail-step);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 8px;
  font-family: var(--ui-font);
  font-size: var(--font-step--2);
  line-height: 1;
  color: #8f8f8f;
  font-weight: 500;
  z-index: 1;
}

.slider-mark-letter {
  position: relative;
  z-index: 1;
  display: inline-block;
  padding: 0 0.18em;
  background: var(--surface-0);
}

.slider-mark::before {
  content: "";
  position: absolute;
  right: calc(50% + 14px);
  top: 50%;
  width: 12px;
  height: 1px;
  transform: translateY(-50%);
  background: #c7c7c7;
  z-index: -1;
}

.slider-mark::after {
  content: "";
  position: absolute;
  left: calc(50% + 14px);
  top: 50%;
  width: 12px;
  height: 1px;
  transform: translateY(-50%);
  background: #c7c7c7;
  z-index: -1;
}

.slider-mark.is-available {
  color: #2f2f2f;
  font-weight: 670;
}

.slider-mark.is-available::before {
  background: #7f7f7f;
}

.slider-mark.is-available::after {
  background: #7f7f7f;
}

.slider-mark.is-blocked {
  color: #a8a8a8;
  font-weight: 480;
}

.slider-mark.is-blocked::before {
  background: #d4d4d4;
}

.slider-mark.is-blocked::after {
  background: #d4d4d4;
}

.slider-mark.is-current {
  color: var(--ink);
  font-size: var(--font-step--1);
  font-weight: 700;
}

.slider-mark.is-current::before {
  background: var(--line-strong);
}

.slider-mark.is-current::after {
  background: var(--line-strong);
}

.slider-thumb {
  position: absolute;
  left: var(--slider-lane-left);
  top: calc(var(--rail-edge-gap) + ((var(--thumb-index) + 0.5) * var(--rail-step)));
  transform: translate(-50%, -50%);
  width: 58px;
  height: 34px;
  border: 1px solid var(--line-strong);
  background:
    linear-gradient(180deg, var(--surface-2) 0%, var(--surface-3) 100%);
  box-shadow:
    0 0 0 1px rgba(255, 255, 255, 0.55) inset,
    0 1px 0 rgba(0, 0, 0, 0.06);
  display: grid;
  place-items: center;
  color: var(--ink);
  z-index: 3;
}

.slider-thumb span {
  position: relative;
  z-index: 2;
  font-size: var(--font-step-0);
  line-height: 1;
  font-weight: 700;
}

.slider-column:not(.is-settled):not(.is-active) .slider-thumb {
  border-color: #8f8f8f;
  background: linear-gradient(180deg, #d4d4d4 0%, #c9c9c9 100%);
  color: #2b2b2b;
}

.slider-column:not(.is-settled):not(.is-active) .slider-thumb span {
  color: #2b2b2b;
}

.slider-column.is-settled .slider-thumb {
  border-color: #60775f;
  background: linear-gradient(180deg, #dbe5db 0%, #d1dcd1 100%);
}

.slider-column.is-active .slider-thumb {
  border-color: var(--accent-crimson-eink);
  background: linear-gradient(180deg, #f3dde2 0%, #ebd0d7 100%);
  box-shadow:
    0 0 0 1px rgba(255, 255, 255, 0.62) inset,
    0 0 0 1px rgba(165, 57, 79, 0.28),
    0 1px 0 rgba(0, 0, 0, 0.06);
}

.slider-column.is-active .slider-thumb span {
  color: #3a1f26;
}

.slider-page-glow {
  display: none;
}

.depth-scrollbar {
  position: relative;
  height: 14px;
  border: 1px solid var(--line);
  background: var(--surface-1);
  cursor: ew-resize;
}

.depth-scrollbar[hidden] {
  display: none !important;
}

.depth-scrollbar.is-dragging {
  cursor: grabbing;
}

.depth-scroll-thumb {
  position: absolute;
  top: -1px;
  bottom: -1px;
  left: 0;
  min-width: 42px;
  border: 1px solid var(--line-strong);
  background: var(--surface-3);
}

.depth-scroll-thumb::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  width: 14px;
  height: 6px;
  transform: translate(-50%, -50%);
  border-top: 1px solid #9b9b9b;
  border-bottom: 1px solid #626262;
}

.quick-words {
  display: grid;
  align-content: start;
  gap: 6px;
  padding: 10px;
  min-width: 0;
  width: fit-content;
  max-width: 100%;
}

.quick-words--action {
  margin-top: 8px;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.definition-action {
  justify-self: start;
  flex: 0 0 auto;
  padding: 10px 12px;
  border: 1px solid var(--accent-blue-eink);
  background: var(--accent-blue-surface);
  color: var(--accent-blue-eink);
  font-size: var(--font-step--1);
  line-height: 1.2;
  font-weight: 700;
  cursor: pointer;
}

.definition-action:hover,
.definition-action:focus-visible {
  border-color: #324358;
  background: #e2e7ee;
}

.definition-action:disabled {
  opacity: 0.62;
  cursor: default;
}

.definition-action.is-reserved {
  visibility: hidden;
  pointer-events: none;
}

@media (max-width: 1060px) {
  .status-grid {
    grid-template-columns: 1fr;
  }

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

  .definition-panel--banner.has-ipa-row .definition-head {
    max-width: 100%;
  }
}

@media (max-width: 760px) {
  .scene {
    width: min(100vw - 16px, 1180px);
    padding: 8px 0 12px;
  }

  .board-top,
  .grid-frame {
    padding: 8px;
  }

  .quick-words--action {
    flex-direction: column;
    align-items: stretch;
  }

  .help-menu-panel {
    width: min(420px, calc(100vw - 48px));
  }

  .status-strip {
    min-height: 0;
    padding: 5px;
  }

  .status-metrics {
    padding: 5px;
  }

  .status-grid,
  .summary-grid {
    gap: 6px;
  }

  .summary-progress {
    gap: 5px;
  }

  .preview-chip {
    gap: 3px;
    padding: 4px 5px;
  }

  .summary-copy {
    gap: 5px;
    padding: 6px;
  }

  .quick-words {
    gap: 5px;
    padding: 7px;
  }

  .definition-panel {
    gap: 5px;
    padding: 7px;
  }

  .definition-meanings {
    gap: 5px;
  }

  .meaning-item {
    gap: 4px;
    padding: 6px;
  }

  .slider-stage {
    min-height: 350px;
    gap: 8px;
  }

  .slider-column {
    width: 84px;
    flex-basis: 84px;
  }

  .slider-card {
    padding: 5px;
  }

  .slider-rail {
    --rail-edge-gap: 12px;
    height: 286px;
  }

  .slider-mark {
    padding: 0 6px;
  }

  .slider-thumb {
    width: 42px;
    height: 28px;
  }

  .slider-thumb span {
    font-size: var(--font-step--1);
  }

  .example-word {
    min-height: 28px;
    padding: 0.38rem 0.5rem;
    font-size: clamp(0.56rem, 2vw, 0.7rem);
  }

  .definition-action {
    width: auto;
    padding: 8px 10px;
  }
}

@media (max-width: 520px) {
  .summary-progress {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .status-strip {
    padding: 4px;
  }

  .status-metrics {
    padding: 4px;
  }

  .preview-chip {
    padding: 3px 4px;
  }

  .summary-copy,
  .quick-words,
  .definition-panel {
    padding: 5px;
  }

  .definition-word {
    line-height: 1.04;
  }

  .meaning-item {
    padding: 5px;
  }

  .slider-stage {
    min-height: 320px;
    gap: 6px;
  }

  .slider-column {
    width: 76px;
    flex-basis: 76px;
    gap: 7px;
  }

  .slider-rail {
    height: 256px;
  }

}

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