/* GPT-2 visualization page */

body.body-gpt2 main {
  max-width: min(100% - 6vw, 64em);
  padding: 2em 3vw 4em;
}

.gpt2-doc {
  font-family: var(--font-ui);
  color: var(--color-text);
  line-height: 1.8;
}

.gpt2-series-nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.8em;
  font-size: 0.85em;
  padding: 0.6em 0;
  margin-top: 1em;
  color: var(--color-base);
}
.gpt2-series-nav a {
  color: var(--color-base);
  text-decoration: none;
  border-bottom: 1px dashed currentColor;
}
.gpt2-series-nav a:hover {
  color: var(--color-heading);
  border-bottom-style: solid;
}
.gpt2-series-ep {
  letter-spacing: 0.1em;
  color: var(--color-text-muted, #888);
}
.gpt2-hero {
  padding: 2em 0 1em;
  border-bottom: 1px solid var(--color-line);
  margin-bottom: 2.5em;
}
.gpt2-eyebrow {
  font-size: 0.8em;
  letter-spacing: 0.2em;
  color: var(--color-base);
  text-transform: uppercase;
  margin: 0 0 0.2em;
}
.gpt2-hero h1 {
  font-size: 2.4em;
  margin: 0 0 0.4em;
  color: var(--color-heading);
  line-height: 1.2;
}
.gpt2-hero-sub {
  display: block;
  font-size: 0.55em;
  font-weight: 600;
  color: var(--color-base);
  margin-top: 0.4em;
  letter-spacing: 0;
}
.gpt2-lede {
  font-size: 1.1em;
  max-width: 40em;
  margin: 0 0 1.2em;
}
/* Intro section */
.gpt2-intro {
  margin: 0 0 3em;
}
.gpt2-intro p {
  margin: 0 0 1em;
}
.gpt2-intro-list {
  margin: 0.5em 0 1.2em 1.4em;
  padding: 0;
}
.gpt2-intro-list li {
  margin: 0.3em 0;
}

/* Table of contents (article-style) */
.gpt2-toc {
  margin: 2em 0 0;
  padding: 1.2em 1.4em;
  border: 1px solid var(--color-line);
  border-radius: 10px;
  background: color-mix(in srgb, var(--color-line) 40%, transparent);
  font-size: 0.95em;
}
.gpt2-toc-heading {
  margin: 0 0 0.6em;
  font-size: 1em;
  letter-spacing: 0.08em;
  color: var(--color-heading);
}
.gpt2-toc-cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.4em 1.2em;
}
@media (max-width: 720px) {
  .gpt2-toc-cols {
    grid-template-columns: 1fr;
    gap: 0.6em 0;
  }
}
.gpt2-toc-col {
  min-width: 0;
}
.gpt2-toc-part-h {
  font-size: 0.85em;
  letter-spacing: 0.1em;
  color: var(--color-base);
  margin: 0.6em 0 0.3em;
  font-weight: 700;
}
.gpt2-toc-list {
  margin: 0;
  padding-left: 1.6em;
}
.gpt2-toc-list li {
  margin: 0.15em 0;
}
.gpt2-toc-list-nonum {
  list-style: none;
  padding-left: 0;
}
.gpt2-toc-extra {
  margin-top: 0.6em;
  padding-top: 0.6em;
  border-top: 1px dashed var(--color-line);
}
.gpt2-toc a {
  color: var(--color-link);
  text-decoration: none;
}
.gpt2-toc a:hover {
  text-decoration: underline;
}

/* Part dividers (no bottom border to avoid doubling with section top border) */
.gpt2-part {
  margin: 3.5em 0 1em;
  padding: 1.6em 0 0.5em;
  border-top: 2px solid var(--color-base);
  text-align: center;
}
.gpt2-part-eyebrow {
  font-family: var(--font-code);
  font-size: 0.8em;
  letter-spacing: 0.3em;
  color: var(--color-base);
  margin-bottom: 0.3em;
}
.gpt2-part-title {
  font-size: 2.2em;
  color: var(--color-heading);
  margin: 0 0 0.4em;
  font-weight: 800;
}
.gpt2-part-lede {
  max-width: 36em;
  margin: 0 auto;
  font-size: 1em;
  opacity: 0.85;
}
/* First section right after a Part divider: no top border (divider already separates) */
.gpt2-part + .gpt2-prompt-picker,
.gpt2-part + .gpt2-section {
  border-top: 0;
}
.gpt2-prompt-picker + .gpt2-section {
  border-top: 0;
}

/* ----- Prompt picker ----- */
.gpt2-prompt-picker {
  background: var(--color-line);
  padding: 1.2em 1.4em;
  border-radius: 12px;
  margin-bottom: 3em;
}
.gpt2-prompt-picker h2 {
  margin: 0 0 0.4em;
  font-size: 1.15em;
  color: var(--color-heading);
}
.gpt2-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5em;
  margin-top: 0.6em;
}
.gpt2-chip {
  font-family: var(--font-code);
  font-size: 0.85em;
  padding: 0.4em 0.9em;
  border-radius: 6px;
  border: 1px solid transparent;
  background: var(--color-bg);
  color: var(--color-text);
  cursor: pointer;
  transition: all 0.15s;
}
.gpt2-chip:hover {
  border-color: var(--color-base);
}
.gpt2-chip[aria-selected="true"] {
  background: var(--color-base);
  color: white;
}
.gpt2-current {
  margin: 0.6em 0 0;
  font-size: 0.85em;
  color: var(--color-text);
  opacity: 0.8;
}
.gpt2-current code {
  font-size: 1em;
  background: var(--color-bg);
  padding: 0.1em 0.4em;
  border-radius: 4px;
}

/* ----- Sections ----- */
.gpt2-section {
  padding: 2em 0;
  border-top: 1px solid var(--color-line);
}
.gpt2-section h2 {
  font-size: 1.45em;
  color: var(--color-heading);
  margin: 0 0 0.6em;
}
.gpt2-section p {
  margin: 0 0 1em;
}
.gpt2-subh {
  font-size: 1.15em;
  color: var(--color-heading);
  margin: 1.8em 0 0.5em;
}
.gpt2-note {
  font-size: 0.85em;
  color: var(--color-text);
  opacity: 0.8;
  border-left: 3px solid var(--color-line);
  padding-left: 0.9em;
  margin-top: 0.8em !important;
}
.gpt2-math {
  text-align: center;
  font-size: 1.05em;
  padding: 0.8em;
  background: var(--color-line);
  border-radius: 6px;
}

/* ----- Tokens ----- */
.gpt2-tokens {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  padding: 1em;
  background: var(--color-line);
  border-radius: 8px;
  font-family: var(--font-code);
}
.gpt2-tok {
  padding: 0.35em 0.7em;
  border-radius: 4px;
  font-size: 0.95em;
  cursor: pointer;
  position: relative;
  white-space: pre;
  border: 2px solid transparent;
  font-family: inherit;
  transition: all 0.1s;
}
.gpt2-tok:hover {
  transform: translateY(-1px);
}
.gpt2-tok.selected {
  border-color: var(--color-heading);
  box-shadow: 0 2px 6px rgba(0,0,0,0.1);
}
.gpt2-tok[data-leading-space="1"]::before {
  content: "";
  display: inline-block;
  width: 2px;
  height: 1em;
  background: currentColor;
  opacity: 0.25;
  margin-right: 0.35em;
  vertical-align: middle;
  margin-left: -0.35em;
}

.gpt2-tok-detail {
  margin-top: 1em;
  background: var(--color-line);
  padding: 1em 1.2em;
  border-radius: 8px;
  border: 2px solid var(--color-base);
  font-family: var(--font-code);
  font-size: 0.9em;
}
.gpt2-tok-detail.placeholder {
  border-style: dashed;
  border-color: var(--color-line);
  background: transparent;
  opacity: 0.7;
  text-align: center;
  color: var(--color-text);
}
.gpt2-tok-detail-title {
  font-size: 1em;
  color: var(--color-heading);
  margin: 0 0 0.6em;
  display: flex;
  align-items: center;
  gap: 0.6em;
  flex-wrap: wrap;
}
.gpt2-tok-detail-idx {
  color: var(--color-base);
}
.gpt2-tok-detail-flag {
  font-size: 0.75em;
  padding: 0.2em 0.6em;
  background: var(--color-base);
  color: white;
  border-radius: 999px;
}
.gpt2-tok-detail-flag.ok {
  background: var(--color-bg);
  color: var(--color-text);
  border: 1px solid var(--color-line);
}
.gpt2-tok-detail-grid {
  display: grid;
  grid-template-columns: 6em 1fr;
  gap: 0.35em 1em;
  margin: 0;
}
.gpt2-tok-detail-grid dt {
  color: var(--color-heading);
  opacity: 0.75;
}
.gpt2-tok-detail-grid dd {
  margin: 0;
}
.gpt2-tok-detail-grid code {
  background: var(--color-bg);
  padding: 0.1em 0.4em;
  border-radius: 4px;
  color: var(--color-link);
}
.gpt2-tok-detail-grid small {
  opacity: 0.65;
  font-size: 0.85em;
  margin-left: 0.3em;
}

/* Tokenization comparison appendix */
.gpt2-tok-compare {
  background: var(--color-line);
  padding: 1.2em;
  border-radius: 8px;
  font-family: var(--font-code);
  font-size: 0.85em;
  margin-bottom: 1em;
}
.gpt2-tok-compare-row {
  display: grid;
  grid-template-columns: 8em 1fr 4em;
  gap: 0.8em;
  align-items: center;
  padding: 0.5em 0;
}
.gpt2-tok-compare-row + .gpt2-tok-compare-desc {
  margin: 0 0 0.8em 9em;
  font-size: 0.8em;
  opacity: 0.85;
  display: flex;
  gap: 1em;
  flex-wrap: wrap;
}
.gpt2-tok-compare-label strong {
  color: var(--color-heading);
}
.gpt2-tok-compare-label small {
  opacity: 0.65;
}
.gpt2-tok-compare-tiles {
  display: flex;
  flex-wrap: wrap;
  gap: 2px;
}
.gpt2-tok-compare-tile {
  padding: 0.2em 0.5em;
  border-radius: 3px;
  background: var(--color-bg);
  color: var(--color-heading);
  white-space: pre;
  font-size: 0.85em;
}
.gpt2-tok-compare-tile[data-leading-space="1"] {
  background: #eaf4fb;
  color: var(--color-link);
}
.gpt2-tok-compare-tile[data-kind="space"] {
  background: transparent;
  color: var(--color-base);
  opacity: 0.6;
  padding: 0.2em 0.3em;
}
.gpt2-tok-compare-row.m-bpe .gpt2-tok-compare-tile {
  background: var(--color-base);
  color: white;
}
.gpt2-tok-compare-row.m-bpe .gpt2-tok-compare-tile[data-leading-space="1"] {
  background: var(--color-link);
}
.gpt2-tok-compare-count {
  text-align: right;
  color: var(--color-heading);
  font-weight: bold;
}
.gpt2-tok-compare-desc .pros {
  color: #2b7a3f;
}
.gpt2-tok-compare-desc .cons {
  color: #a03030;
}
[data-theme="dark"] .gpt2-tok-compare-desc .pros { color: #7fc890; }
[data-theme="dark"] .gpt2-tok-compare-desc .cons { color: #dd8686; }
[data-theme="dark"] .gpt2-tok-compare-tile[data-leading-space="1"] { background: #234; color: #b5d4e8; }

/* ----- Embed ----- */
.gpt2-embed-tables {
  margin: 0 0 1em;
  padding-left: 1.5em;
}
.gpt2-embed-tables li {
  margin: 0.2em 0;
  font-size: 0.95em;
}
.gpt2-embed {
  display: flex;
  flex-direction: column;
  gap: 0.6em;
  background: var(--color-line);
  padding: 1.2em;
  border-radius: 8px;
  overflow-x: auto;
}
.gpt2-embed-row {
  display: flex;
  align-items: stretch;
  gap: 0.8em;
}
.gpt2-embed-label {
  min-width: 9em;
  font-size: 0.85em;
  font-family: var(--font-code);
  color: var(--color-heading);
  line-height: 1.3;
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.gpt2-embed-label small {
  opacity: 0.65;
  font-size: 0.85em;
  margin-top: 0.15em;
}
.gpt2-embed-rowlabels {
  display: flex;
  flex-direction: column;
  gap: 1px;
  font-family: var(--font-code);
  font-size: 0.72em;
  color: var(--color-heading);
  padding: 2px 0;
}
.gpt2-embed-rowlabels > div {
  height: 14px;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  padding-right: 0.4em;
  min-width: 5em;
  opacity: 0.85;
  white-space: pre;
}
.gpt2-embed-op {
  align-self: center;
  font-size: 1.4em;
  color: var(--color-base);
  padding-left: 9em;
}
.gpt2-embed-grid {
  display: grid;
  gap: 1px;
  background: var(--color-bg);
  padding: 2px;
  border-radius: 4px;
  cursor: pointer;
}
.gpt2-embed-cell {
  width: 6px;
  height: 14px;
}
.gpt2-embed-row-overlay {
  position: absolute;
  left: 0;
  right: 0;
  border: 2px solid var(--color-heading);
  border-radius: 2px;
  pointer-events: none;
  box-sizing: border-box;
}

.gpt2-embed-focus {
  margin-top: 1em;
  background: var(--color-line);
  padding: 1.2em 1.4em;
  border-radius: 8px;
  border: 2px solid var(--color-base);
}
.gpt2-embed-focus-title {
  margin: 0 0 0.8em;
  font-size: 1em;
  color: var(--color-heading);
  font-family: var(--font-code);
}
.gpt2-embed-focus-title code {
  background: var(--color-bg);
  padding: 0.1em 0.5em;
  border-radius: 4px;
  color: var(--color-link);
}
.gpt2-embed-focus-rows {
  display: flex;
  flex-direction: column;
  gap: 0.3em;
  overflow-x: auto;
}
.gpt2-embed-focus-row {
  display: flex;
  align-items: center;
  gap: 0.8em;
}
.gpt2-embed-focus-label {
  min-width: 6em;
  font-family: var(--font-code);
  font-size: 0.9em;
  color: var(--color-heading);
}
.gpt2-embed-focus-strip {
  display: grid;
  grid-auto-flow: column;
  gap: 1px;
  background: var(--color-bg);
  padding: 2px;
  border-radius: 4px;
}
.gpt2-embed-focus-cell {
  width: 14px;
  height: 28px;
}
.gpt2-embed-focus-op {
  font-size: 1.3em;
  color: var(--color-base);
  padding-left: 6em;
}
.gpt2-embed-focus-example {
  margin: 0.8em 0 0 !important;
  font-family: var(--font-code);
  font-size: 0.85em;
  opacity: 0.85;
  border-left: none !important;
  padding-left: 0 !important;
}

/* ----- Attention ----- */
.gpt2-attn-controls {
  display: flex;
  gap: 1.5em;
  flex-wrap: wrap;
  margin: 1em 0;
  font-size: 0.9em;
  font-family: var(--font-code);
}
.gpt2-attn-controls label {
  display: flex;
  align-items: center;
  gap: 0.5em;
}
.gpt2-attn {
  background: var(--color-line);
  padding: 1.2em;
  border-radius: 8px;
  overflow-x: auto;
}
.gpt2-attn-heat {
  display: grid;
  gap: 0;
  margin: 0 auto;
  width: fit-content;
  grid-auto-flow: row;
}
.gpt2-attn-row {
  display: grid;
  gap: 0;
}
.gpt2-attn-cell {
  min-width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-code);
  font-size: 0.7em;
  color: var(--color-heading);
  border: 1px solid rgba(0,0,0,0.05);
}
.gpt2-attn-header {
  font-family: var(--font-code);
  font-size: 0.7em;
  padding: 4px;
  text-align: center;
  color: var(--color-heading);
  background: transparent;
  border: none;
  min-width: 44px;
}
.gpt2-attn-rowlabel {
  font-family: var(--font-code);
  font-size: 0.7em;
  padding: 0 8px;
  text-align: right;
  color: var(--color-heading);
  display: flex;
  align-items: center;
  justify-content: flex-end;
  min-width: 5em;
}
.gpt2-attn-legend {
  display: flex;
  align-items: center;
  gap: 0.5em;
  margin-top: 0.8em;
  font-size: 0.8em;
  justify-content: center;
}
.gpt2-attn-gradient {
  width: 8em;
  height: 12px;
  background: linear-gradient(to right, #f8fbff, #4a88b0);
  border-radius: 2px;
}

/* ----- Attention mix (weighted-sum viz) ----- */
.gpt2-attn-mix {
  margin: 1em 0 1.5em;
  padding: 1em 1.2em;
  background: var(--color-line);
  border-radius: 8px;
}
.gpt2-attn-mix-header {
  font-size: 0.9em;
  color: var(--color-heading);
  margin-bottom: 0.6em;
}
.gpt2-attn-mix-header small {
  color: var(--color-base);
  font-size: 0.85em;
}
.gpt2-attn-mix-control {
  display: flex;
  align-items: center;
  gap: 0.8em;
  margin-bottom: 1em;
  font-size: 0.85em;
  font-family: var(--font-code);
}
.gpt2-attn-mix-control input[type="range"] {
  flex: 1;
  max-width: 24em;
}
.gpt2-attn-mix-bars {
  display: flex;
  align-items: stretch;
  gap: 4px;
  padding: 8px 0 4px;
  border-bottom: 1px solid rgba(0,0,0,0.08);
  overflow-x: auto;
}
.gpt2-attn-mix-bar-cell {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  flex: 1 1 44px;
  min-width: 44px;
}
.gpt2-attn-mix-bar-cell.is-future {
  opacity: 0.25;
}
.gpt2-attn-mix-bar-cell.is-focus .gpt2-attn-mix-bar-fill {
  background: #c0392b;
}
.gpt2-attn-mix-bar-box {
  height: 110px;
  display: flex;
  align-items: flex-end;
}
.gpt2-attn-mix-bar-fill {
  width: 100%;
  background: #4a88b0;
  border-radius: 3px 3px 0 0;
  min-height: 1px;
  transition: height 0.12s ease-out;
}
.gpt2-attn-mix-bar-tok {
  margin-top: 6px;
  text-align: center;
  font-size: 0.75em;
  font-family: var(--font-code);
  color: var(--color-heading);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.gpt2-attn-mix-bar-w {
  text-align: center;
  font-size: 0.7em;
  color: var(--color-base);
  font-family: var(--font-code);
}
.gpt2-attn-mix-formula {
  margin-top: 0.8em;
  font-size: 0.82em;
  font-family: var(--font-code);
  line-height: 1.7;
  color: var(--color-heading);
  overflow-x: auto;
  white-space: nowrap;
  padding-bottom: 4px;
}

/* ----- Stack (layer heatmap) ----- */
.gpt2-block-diagram {
  background: var(--color-line);
  padding: 1em 1.2em;
  border-radius: 8px;
  font-family: var(--font-code);
  font-size: 0.85em;
  line-height: 1.5;
  overflow-x: auto;
}
.gpt2-diagrams {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.2em;
  margin: 1em 0;
}
@media (max-width: 900px) {
  .gpt2-diagrams { grid-template-columns: 1fr; }
}
.gpt2-diagram {
  background: var(--color-line);
  padding: 1em;
  border-radius: 8px;
  margin: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
}
.gpt2-diagram figcaption {
  font-size: 0.85em;
  color: var(--color-heading);
  font-family: var(--font-code);
  margin-bottom: 0.6em;
  text-align: center;
}

/* Flow diagrams (replacing mermaid) */
.gpt2-flow {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.55em;
  width: 100%;
  font-family: var(--font-code);
  font-size: 0.88em;
}
.gpt2-flow-node {
  background: var(--color-bg);
  border: 1px solid var(--color-base);
  color: var(--color-heading);
  padding: 0.5em 0.9em;
  border-radius: 6px;
  min-width: 10em;
  text-align: center;
  line-height: 1.3;
  position: relative;
}
.gpt2-flow-node span {
  display: block;
  font-size: 0.78em;
  color: var(--color-base);
  margin-top: 0.15em;
  letter-spacing: 0.02em;
}
.gpt2-flow-io {
  background: #eaf4fb;
  border-width: 2px;
  font-weight: 600;
}
[data-theme="dark"] .gpt2-flow-io {
  background: #1f3344;
}
.gpt2-flow-op-accent {
  background: #d8ecf8;
}
[data-theme="dark"] .gpt2-flow-op-accent {
  background: #243d52;
}
.gpt2-flow-plus {
  width: 1.8em;
  height: 1.8em;
  border-radius: 50%;
  border: 1.5px solid var(--color-base);
  color: var(--color-base);
  background: var(--color-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1em;
  margin: 0.1em 0;
}
.gpt2-flow-branch {
  position: relative;
  display: flex;
  align-items: stretch;
  gap: 0.8em;
  padding-left: 5.5em;
}
.gpt2-flow-branch::before {
  content: attr(data-sub);
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  font-size: 0.72em;
  color: var(--color-base);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  width: 5em;
  text-align: right;
  padding-right: 0.4em;
}
.gpt2-flow-main {
  display: flex;
  flex-direction: column;
  gap: 0.35em;
  align-items: center;
}
.gpt2-flow-skip {
  align-self: stretch;
  display: flex;
  align-items: center;
  font-size: 0.72em;
  color: var(--color-base);
  letter-spacing: 0.06em;
  padding: 0 0.4em 0 0.8em;
  position: relative;
}
.gpt2-flow-skip::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.4em;
  bottom: 0.4em;
  width: 0.6em;
  border: 1.5px dashed var(--color-base);
  border-right: none;
  border-radius: 6px 0 0 6px;
}
/* Arrow connectors between stacked nodes */
.gpt2-flow > .gpt2-flow-node + .gpt2-flow-node::before,
.gpt2-flow > .gpt2-flow-node + .gpt2-flow-branch::before,
.gpt2-flow > .gpt2-flow-branch + .gpt2-flow-plus::before,
.gpt2-flow > .gpt2-flow-plus + .gpt2-flow-branch::before,
.gpt2-flow > .gpt2-flow-plus + .gpt2-flow-node::before {
  /* no-op; connectors drawn via gap + plus nodes */
}
.gpt2-flow-stack-list {
  display: flex;
  flex-direction: column;
  gap: 0.35em;
  align-items: center;
}
.gpt2-flow-blk {
  background: #d8ecf8;
  min-width: 9em;
  padding: 0.4em 0.9em;
  font-size: 0.88em;
}
[data-theme="dark"] .gpt2-flow-blk {
  background: #243d52;
}
.gpt2-flow-stack-dots {
  color: var(--color-base);
  font-size: 1.2em;
  display: flex;
  flex-direction: column;
  align-items: center;
  line-height: 1;
  padding: 0.2em 0;
}
.gpt2-flow-stack-dots span {
  font-size: 0.58em;
  letter-spacing: 0.08em;
  color: var(--color-base);
  font-family: var(--font-code);
  margin-top: 0.2em;
}

/* Teacher forcing diagram (⑧) */
.gpt2-train {
  background: var(--color-line);
  border-radius: 8px;
  padding: 1.2em 1em;
  margin: 1em 0;
  overflow-x: auto;
}
.gpt2-train-scroll {
  min-width: max-content;
  position: relative;
}
.gpt2-train-rows {
  display: flex;
  flex-direction: column;
  gap: 3.2em;
  position: relative;
  z-index: 1;
}
.gpt2-train-row {
  display: flex;
  gap: 0.5em;
  align-items: center;
}
.gpt2-train-label {
  min-width: 7em;
  font-size: 0.78em;
  color: var(--color-base);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  text-align: right;
  padding-right: 0.5em;
  font-family: var(--font-code);
}
.gpt2-train-cells {
  display: flex;
  gap: 0.4em;
}
.gpt2-train-cell {
  background: var(--color-bg);
  border: 1px solid var(--color-base);
  color: var(--color-heading);
  border-radius: 4px;
  padding: 0.4em 0.65em;
  font-family: var(--font-code);
  font-size: 0.9em;
  min-width: 2em;
  text-align: center;
}
.gpt2-train-row-target .gpt2-train-cell {
  background: var(--color-base);
  color: #fff;
  border-color: var(--color-base);
}
.gpt2-train-arrows {
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  overflow: visible;
  z-index: 0;
}
.gpt2-train-arrows path {
  fill: none;
  stroke: var(--color-base);
  stroke-width: 1.2;
  stroke-dasharray: 3 3;
  opacity: 0.7;
}
.gpt2-train-arrows .gpt2-train-arrow-head {
  fill: var(--color-base);
  stroke: none;
  opacity: 0.85;
}

/* Block-steps list */
.gpt2-block-steps {
  list-style: none;
  padding: 0;
  margin: 1em 0;
  display: grid;
  gap: 0.8em;
}
.gpt2-block-steps li {
  background: var(--color-line);
  padding: 1em 1.2em;
  border-radius: 8px;
  border-left: 4px solid var(--color-base);
}
.gpt2-block-steps li strong {
  color: var(--color-heading);
  font-size: 1em;
}
.gpt2-stack {
  background: var(--color-line);
  padding: 1em;
  border-radius: 8px;
  display: flex;
  flex-direction: column;
  gap: 2px;
  overflow-x: auto;
  font-family: var(--font-code);
  font-size: 0.8em;
}
.gpt2-stack-row {
  display: flex;
  align-items: center;
  gap: 0.6em;
}
.gpt2-stack-label {
  min-width: 5em;
  color: var(--color-heading);
}
.gpt2-stack-cells {
  display: flex;
  gap: 2px;
}
.gpt2-stack-cell {
  width: 44px;
  height: 22px;
  border-radius: 2px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75em;
  color: white;
}

/* ----- Sampling bars ----- */
.gpt2-sampling-controls {
  display: flex;
  gap: 1.5em;
  flex-wrap: wrap;
  margin: 1em 0;
  font-size: 0.9em;
  font-family: var(--font-code);
}
.gpt2-sampling-controls label {
  display: flex;
  align-items: center;
  gap: 0.5em;
}
.gpt2-bars {
  background: var(--color-line);
  padding: 1.2em;
  border-radius: 8px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-family: var(--font-code);
  font-size: 0.85em;
}
.gpt2-bar {
  display: grid;
  grid-template-columns: 9em 1fr 4.5em;
  gap: 0.6em;
  align-items: center;
  transition: opacity 0.2s;
}
.gpt2-bar.filtered {
  opacity: 0.25;
}
.gpt2-bar-label {
  text-align: right;
  white-space: pre;
}
.gpt2-bar-track {
  background: var(--color-bg);
  border-radius: 3px;
  height: 18px;
  position: relative;
}
.gpt2-bar-fill {
  background: var(--color-base);
  height: 100%;
  border-radius: 3px;
  transition: width 0.2s;
}
.gpt2-bar-value {
  font-size: 0.8em;
  color: var(--color-text);
  opacity: 0.7;
}

/* ----- Generation ----- */
.gpt2-gen-controls {
  display: flex;
  gap: 1em;
  align-items: center;
  flex-wrap: wrap;
  margin: 1em 0;
  font-family: var(--font-code);
  font-size: 0.9em;
}
.gpt2-gen-controls button {
  background: var(--color-base);
  color: white;
  border: none;
  padding: 0.5em 1em;
  border-radius: 6px;
  font-family: inherit;
  font-size: 0.9em;
  cursor: pointer;
}
.gpt2-gen-controls button:hover {
  background: var(--color-link-hover);
}
.gpt2-gen {
  background: var(--color-line);
  padding: 1.2em;
  border-radius: 8px;
  font-family: var(--font-code);
  font-size: 1em;
  line-height: 2.2;
  min-height: 3em;
}
.gpt2-gen-tok {
  display: inline-block;
  padding: 0.15em 0.5em;
  margin: 0 2px;
  border-radius: 3px;
  white-space: pre;
  background: var(--color-bg);
}
.gpt2-gen-tok.seed {
  color: var(--color-text);
}
.gpt2-gen-tok.new {
  background: var(--color-base);
  color: white;
  animation: pop 0.3s;
}
.gpt2-gen-tok.pending {
  opacity: 0.3;
}
@keyframes pop {
  0% { transform: scale(0.8); opacity: 0; }
  100% { transform: scale(1); opacity: 1; }
}
.gpt2-gen-topk {
  margin-top: 0.8em;
}

/* ----- Train / Grad ----- */
.gpt2-train, .gpt2-grad {
  background: var(--color-line);
  padding: 1.2em;
  border-radius: 8px;
  font-family: var(--font-code);
  font-size: 0.9em;
  overflow-x: auto;
}
.gpt2-train-row {
  display: flex;
  align-items: center;
  gap: 0.4em;
  margin: 0.4em 0;
}
.gpt2-train-label {
  min-width: 5em;
  color: var(--color-heading);
  font-weight: bold;
}
.gpt2-train-cell {
  padding: 0.35em 0.6em;
  border-radius: 4px;
  white-space: pre;
  font-size: 0.9em;
}
.gpt2-train-cell.input {
  background: var(--color-bg);
  border: 1px solid var(--color-base);
  color: var(--color-heading);
}
.gpt2-train-cell.target {
  background: var(--color-base);
  color: white;
}
.gpt2-train-cell.shift {
  padding: 0.35em 0.2em;
  background: transparent;
  color: var(--color-base);
}

.gpt2-grad-flow {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.gpt2-grad-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4em 1.4em;
  padding: 0.4em 0.8em;
  margin-bottom: 0.6em;
  font-size: 0.85em;
  background: var(--color-bg);
  border-radius: 4px;
}
.gpt2-grad-dir-up {
  color: var(--color-base);
  font-weight: bold;
}
.gpt2-grad-dir-down {
  color: #c0392b;
  font-weight: bold;
}
[data-theme="dark"] .gpt2-grad-dir-down {
  color: #ff7f6e;
}
.gpt2-grad-step {
  padding: 0.5em 0.8em;
  background: var(--color-bg);
  border-radius: 4px;
  border-left: 4px solid var(--color-base);
}
.gpt2-grad-step-head {
  font-size: 0.95em;
}
.gpt2-grad-step-body {
  margin-top: 0.2em;
  font-size: 0.85em;
  opacity: 0.85;
}
.gpt2-grad-step-label {
  font-family: var(--font-ui);
  font-size: 0.8em;
  letter-spacing: 0.05em;
  color: var(--color-base);
  margin-right: 0.3em;
}
.gpt2-grad-edge {
  display: flex;
  align-items: center;
  gap: 0.6em;
  padding: 0.15em 1.2em;
  font-size: 0.85em;
}
.gpt2-grad-edge-last {
  padding: 0.4em 0.8em;
  background: color-mix(in srgb, var(--color-base) 15%, transparent);
  border-radius: 4px;
  font-weight: bold;
}
.gpt2-grad-edge-note {
  opacity: 0.7;
  font-size: 0.9em;
}
.gpt2-grad-arrow {
  color: var(--color-link);
  font-size: 1.2em;
}

/* ----- Footer ----- */
.gpt2-footer {
  margin-top: 3em;
  padding: 1.5em 0;
  border-top: 1px solid var(--color-line);
  font-size: 0.85em;
  color: var(--color-text);
  opacity: 0.8;
}
.gpt2-footer a {
  color: var(--color-link);
}
.gpt2-credit {
  font-family: var(--font-code);
  font-size: 0.8em;
  opacity: 0.7;
}

/* ----- KaTeX inline math ----- */
.gpt2-doc .katex {
  font-size: 1.04em;
  line-height: 1.2;
}
.gpt2-doc .katex-display {
  margin: 0.8em 0;
  overflow-x: auto;
  overflow-y: hidden;
}
.gpt2-doc table .katex { font-size: 1em; }

/* ----- Calculation math blocks in appendices ----- */
.gpt2-math-block {
  background: var(--color-bg);
  border: 1px solid var(--color-line);
  border-radius: 6px;
  padding: 0.8em 1em;
  font-family: var(--font-code);
  font-size: 0.85em;
  line-height: 1.7;
  overflow-x: auto;
  margin: 0.6em 0;
}
.gpt2-math-block code {
  background: transparent;
  padding: 0;
  color: var(--color-heading);
  white-space: pre;
}

/* ----- History / comparison table ----- */
.gpt2-history {
  width: 100%;
  border-collapse: collapse;
  margin: 1em 0;
  font-family: var(--font-code);
  font-size: 0.9em;
}
.gpt2-history th,
.gpt2-history td {
  padding: 0.5em 0.8em;
  text-align: left;
  border-bottom: 1px solid var(--color-line);
}
.gpt2-history th {
  background: var(--color-line);
  color: var(--color-heading);
  font-weight: bold;
}
.gpt2-history tr.gpt2-history-hl td {
  background: var(--color-line);
  color: var(--color-link);
  font-weight: bold;
}
.gpt2-history tr.gpt2-history-sep td {
  padding: 0.4em 0.8em;
  text-align: center;
  font-size: 0.8em;
  color: var(--color-text);
  opacity: 0.6;
  background: transparent;
  border-bottom: 1px dashed var(--color-line);
}

/* ----- Appendix (details/summary) ----- */
.gpt2-appendix {
  margin: 1.2em 0;
  background: var(--color-bg);
  border: 1px dashed var(--color-base);
  border-radius: 8px;
  overflow: hidden;
}
.gpt2-appendix > summary {
  cursor: pointer;
  padding: 0.7em 1em;
  font-size: 0.95em;
  color: var(--color-heading);
  background: transparent;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 0.5em;
  user-select: none;
}
.gpt2-appendix > summary::-webkit-details-marker { display: none; }
.gpt2-appendix > summary::before {
  content: "▸";
  color: var(--color-base);
  transition: transform 0.15s;
  display: inline-block;
  width: 1em;
}
.gpt2-appendix[open] > summary::before {
  transform: rotate(90deg);
}
.gpt2-appendix > summary strong {
  color: var(--color-link);
  font-size: 0.8em;
  padding: 0.15em 0.5em;
  background: var(--color-line);
  border-radius: 4px;
  letter-spacing: 0.05em;
  margin-right: 0.3em;
}
.gpt2-appendix > summary:hover {
  background: var(--color-line);
}
.gpt2-appendix-body {
  padding: 0.2em 1.2em 1.2em;
  border-top: 1px solid var(--color-line);
}
.gpt2-appendix-body > p:first-child {
  margin-top: 0.8em;
}
.gpt2-appendix-body > p:last-child {
  margin-bottom: 0;
}

/* References section */
.gpt2-references ul {
  list-style: disc;
  margin: 0.4em 0 1em 1.4em;
  padding: 0;
  font-size: 0.95em;
}
.gpt2-references li {
  margin: 0.35em 0;
  line-height: 1.6;
}
.gpt2-references li:target {
  background: color-mix(in srgb, var(--color-base) 12%, transparent);
  border-radius: 4px;
  padding: 0.15em 0.4em;
  transition: background 0.3s;
}
.gpt2-references .gpt2-subh {
  font-size: 1em;
  margin: 1.4em 0 0.3em;
  color: var(--color-heading);
  letter-spacing: 0.04em;
}
.gpt2-references a {
  color: var(--color-link);
}

/* ----- Part 3 (実践編) ----- */
.gpt2-pipeline-table-wrap {
  overflow-x: auto;
  margin: 1.2em 0;
}
.gpt2-pipeline-table {
  border-collapse: collapse;
  width: 100%;
  font-size: 0.92em;
  min-width: 36em;
}
.gpt2-pipeline-table th,
.gpt2-pipeline-table td {
  border: 1px solid var(--color-line);
  padding: 0.45em 0.7em;
  text-align: left;
  vertical-align: top;
}
.gpt2-pipeline-table thead th {
  background: var(--color-bg);
  color: var(--color-heading);
  font-weight: 600;
  letter-spacing: 0.04em;
  font-size: 0.88em;
}
.gpt2-pipeline-table code {
  font-size: 0.92em;
}

.gpt2-code-block {
  background: var(--color-bg);
  border: 1px solid var(--color-line);
  border-left: 3px solid var(--color-base);
  border-radius: 6px;
  padding: 0.8em 1em;
  font-family: var(--font-code);
  font-size: 0.83em;
  line-height: 1.55;
  overflow-x: auto;
  margin: 1em 0;
}
.gpt2-code-block code {
  background: transparent;
  padding: 0;
  color: var(--color-heading);
  white-space: pre;
}

/* Prism token colors — light theme (custom, matches article tone) */
.gpt2-code-block .token.comment,
.gpt2-code-block .token.prolog,
.gpt2-code-block .token.doctype,
.gpt2-code-block .token.cdata       { color: #8c96a3; font-style: italic; }
.gpt2-code-block .token.punctuation { color: #586e75; }
.gpt2-code-block .token.number,
.gpt2-code-block .token.boolean     { color: #b07500; }
.gpt2-code-block .token.string,
.gpt2-code-block .token.char        { color: #708a2e; }
.gpt2-code-block .token.operator    { color: #7a5b3a; }
.gpt2-code-block .token.keyword,
.gpt2-code-block .token.builtin     { color: #0c6cad; font-weight: 600; }
.gpt2-code-block .token.function,
.gpt2-code-block .token.class-name  { color: #a15a00; }
.gpt2-code-block .token.decorator,
.gpt2-code-block .token.annotation  { color: #a15a00; }
.gpt2-code-block .token.regex,
.gpt2-code-block .token.important,
.gpt2-code-block .token.variable    { color: #c34a1c; }
.gpt2-code-block .token.property,
.gpt2-code-block .token.tag,
.gpt2-code-block .token.symbol      { color: #c34a4a; }

/* Dark theme overrides */
[data-theme="dark"] .gpt2-code-block .token.comment,
[data-theme="dark"] .gpt2-code-block .token.prolog,
[data-theme="dark"] .gpt2-code-block .token.doctype,
[data-theme="dark"] .gpt2-code-block .token.cdata       { color: #7d8590; }
[data-theme="dark"] .gpt2-code-block .token.punctuation { color: #c9d1d9; }
[data-theme="dark"] .gpt2-code-block .token.number,
[data-theme="dark"] .gpt2-code-block .token.boolean     { color: #79c0ff; }
[data-theme="dark"] .gpt2-code-block .token.string,
[data-theme="dark"] .gpt2-code-block .token.char        { color: #a5d6ff; }
[data-theme="dark"] .gpt2-code-block .token.operator    { color: #d2a8ff; }
[data-theme="dark"] .gpt2-code-block .token.keyword,
[data-theme="dark"] .gpt2-code-block .token.builtin     { color: #ff7b72; }
[data-theme="dark"] .gpt2-code-block .token.function,
[data-theme="dark"] .gpt2-code-block .token.class-name  { color: #d2a8ff; }
[data-theme="dark"] .gpt2-code-block .token.decorator,
[data-theme="dark"] .gpt2-code-block .token.annotation  { color: #ffa657; }
[data-theme="dark"] .gpt2-code-block .token.regex,
[data-theme="dark"] .gpt2-code-block .token.important,
[data-theme="dark"] .gpt2-code-block .token.variable    { color: #ffa657; }
[data-theme="dark"] .gpt2-code-block .token.property,
[data-theme="dark"] .gpt2-code-block .token.tag,
[data-theme="dark"] .gpt2-code-block .token.symbol      { color: #ff7b72; }

.gpt2-loss-figure {
  margin: 1.4em 0;
}
.gpt2-loss-canvas-wrap {
  border: 1px solid var(--color-line);
  border-radius: 6px;
  padding: 0.4em;
  background: var(--color-bg);
  overflow-x: auto;
}
.gpt2-loss-figure canvas {
  display: block;
  margin: 0 auto;
  max-width: 100%;
}
.gpt2-loss-figure figcaption {
  font-size: 0.85em;
  color: var(--color-base);
  margin-top: 0.5em;
  text-align: center;
}

.gpt2-samples {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(22em, 1fr));
  gap: 1em;
  margin: 1.2em 0;
}
.gpt2-sample-card {
  border: 1px solid var(--color-line);
  border-radius: 8px;
  padding: 0.9em 1em;
  background: var(--color-bg);
}
.gpt2-sample-prompt {
  font-size: 0.85em;
  letter-spacing: 0.04em;
  color: var(--color-base);
  margin-bottom: 0.6em;
}
.gpt2-sample-prompt code {
  font-size: 0.95em;
  color: var(--color-heading);
}
.gpt2-sample-list {
  list-style: none;
  padding: 0;
  margin: 0;
}
.gpt2-sample-list li {
  padding: 0.55em 0;
  border-top: 1px dashed var(--color-line);
}
.gpt2-sample-list li:first-child {
  border-top: 0;
  padding-top: 0;
}
.gpt2-sample-iter {
  display: block;
  font-family: var(--font-code);
  font-size: 0.78em;
  color: var(--color-base);
  margin-bottom: 0.25em;
  letter-spacing: 0.02em;
}
.gpt2-sample-text {
  display: block;
  font-size: 0.92em;
  line-height: 1.6;
  color: var(--color-heading);
}

.gpt2-practice-thanks {
  margin-top: 1.6em;
  padding: 0.9em 1.1em;
  border-left: 3px solid var(--color-base);
  background: var(--color-bg);
  font-size: 0.95em;
}

/* Dark theme tweaks */
[data-theme="dark"] .gpt2-attn-gradient {
  background: linear-gradient(to right, #1a2530, #6ba3c7);
}