:root {
  color-scheme: light;
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Microsoft YaHei", sans-serif;
  --bg: #f6f8fb;
  --surface: #ffffff;
  --surface-strong: #eef4f7;
  --surface-blue: #eef7fb;
  --text: #17232e;
  --muted: #637381;
  --soft: #8a98a8;
  --line: #dce5ec;
  --line-strong: #bfcbd5;
  --teal: #0f766e;
  --teal-soft: #dff5f1;
  --blue: #2563eb;
  --blue-soft: #e6f0ff;
  --amber: #d98d00;
  --amber-soft: #fff3d8;
  --coral: #e2584f;
  --coral-soft: #ffe8e4;
  --ink: #0f1f2a;
  --shadow: 0 18px 48px rgba(23, 35, 46, 0.08);
  --radius: 8px;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--bg);
}

body {
  margin: 0;
  min-width: 320px;
  background:
    linear-gradient(180deg, rgba(234, 242, 247, 0.72) 0%, rgba(246, 248, 251, 0) 28%),
    var(--bg);
  color: var(--text);
  letter-spacing: 0;
}

button,
input,
textarea {
  font: inherit;
  letter-spacing: 0;
}

button {
  cursor: pointer;
}

.app-shell {
  min-height: 100vh;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  height: 76px;
  padding: 0 28px;
  border-bottom: 1px solid rgba(190, 204, 216, 0.72);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(16px);
}

.brand {
  display: flex;
  align-items: center;
  min-width: 260px;
  gap: 12px;
}

.brand-mark,
.lesson-icon {
  display: grid;
  flex: 0 0 auto;
  place-items: center;
  width: 34px;
  height: 34px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--teal);
  background: var(--surface);
}

.brand-mark {
  color: #ffffff;
  border-color: #0f5f6b;
  background: #123c4a;
}

.brand-title,
.brand-subtitle,
.section-label,
.lab-heading h1,
.lab-heading p,
.stage-toolbar span,
.stage-toolbar strong,
.panel-heading span,
.panel-heading strong {
  margin: 0;
}

.brand-title {
  font-size: 16px;
  font-weight: 800;
}

.brand-subtitle {
  margin-top: 2px;
  color: var(--muted);
  font-size: 12px;
}

.topbar-controls {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  min-width: 0;
  gap: 12px;
}

.segmented-control {
  display: flex;
  height: 36px;
  padding: 3px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #f7fafc;
}

.segmented-control button {
  min-width: 58px;
  border: 0;
  border-radius: 6px;
  color: var(--muted);
  background: transparent;
  font-size: 12px;
  font-weight: 700;
}

.segmented-control button.is-selected {
  color: var(--ink);
  background: #ffffff;
  box-shadow: 0 2px 8px rgba(23, 35, 46, 0.08);
}

.temperature-control {
  display: grid;
  grid-template-columns: auto 112px 38px;
  align-items: center;
  height: 36px;
  gap: 10px;
  padding: 0 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #ffffff;
}

.temperature-control span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
}

.temperature-control input {
  width: 112px;
  accent-color: var(--teal);
}

.temperature-control strong {
  color: var(--ink);
  font-size: 12px;
  text-align: right;
}

.run-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 116px;
  height: 38px;
  gap: 8px;
  border: 1px solid #0e5968;
  border-radius: var(--radius);
  color: #ffffff;
  background: #123c4a;
  font-size: 13px;
  font-weight: 800;
  box-shadow: 0 8px 20px rgba(18, 60, 74, 0.18);
}

.workspace {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  align-items: start;
  gap: 18px;
  max-width: 1320px;
  margin: 0 auto;
  padding: 18px;
}

.workspace > *,
.lesson-rail,
.lab-surface,
.lesson-brief,
.visual-stage,
.lesson-list,
.heatmap-wrap,
.attention-layout,
.embedding-layout,
.block-layout,
.rag-grid,
.tool-layout,
.eval-layout,
.prompt-trace {
  min-width: 0;
  max-width: 100%;
}

.lesson-rail,
.lab-surface {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.94);
  box-shadow: var(--shadow);
}

.lesson-rail {
  position: sticky;
  top: 94px;
  max-height: calc(100vh - 112px);
  overflow-y: auto;
  padding: 12px;
}

.rail-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 2px 4px 10px;
  color: var(--ink);
  font-size: 13px;
  font-weight: 800;
}

.lesson-list {
  display: grid;
  gap: 5px;
  width: 100%;
}

.lesson-button {
  display: grid;
  grid-template-columns: 26px 30px minmax(0, 1fr);
  align-items: center;
  width: 100%;
  min-height: 48px;
  gap: 8px;
  padding: 6px 7px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  color: var(--text);
  background: transparent;
  text-align: left;
}

.lesson-button .lesson-icon {
  width: 30px;
  height: 30px;
}

.lesson-button:hover {
  border-color: var(--line-strong);
  background: #f7fbfc;
}

.lesson-button.is-active {
  border-color: #a5d6d1;
  background: var(--teal-soft);
}

.lesson-index {
  color: var(--soft);
  font-size: 11px;
  font-weight: 900;
}

.lesson-button strong {
  display: block;
  color: var(--ink);
  font-size: 13px;
}

.lesson-button small {
  display: block;
  margin-top: 2px;
  overflow: hidden;
  color: var(--muted);
  font-size: 10px;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.lab-surface {
  min-width: 0;
  padding: 18px;
}

.lab-heading {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 12px;
}

.section-label {
  color: var(--teal);
  font-size: 12px;
  font-weight: 900;
  text-transform: uppercase;
}

.lab-heading h1 {
  margin-top: 4px;
  color: var(--ink);
  font-size: 30px;
  line-height: 1.08;
}

.lab-heading p {
  max-width: 760px;
  margin-top: 8px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.5;
}

.module-progress {
  display: grid;
  place-items: center;
  width: 62px;
  height: 62px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #f8fbfc;
}

.module-progress span {
  color: var(--ink);
  font-size: 22px;
  font-weight: 900;
  line-height: 1;
}

.module-progress small {
  color: var(--muted);
  font-size: 11px;
  font-weight: 800;
}

.lesson-brief {
  display: grid;
  grid-template-columns: 1.25fr 1fr 0.82fr;
  gap: 10px;
  margin-bottom: 14px;
}

.lesson-brief article {
  min-height: 86px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #f8fbfc;
}

.lesson-brief span {
  display: block;
  margin-bottom: 6px;
  color: var(--teal);
  font-size: 11px;
  font-weight: 900;
  text-transform: uppercase;
}

.lesson-brief p {
  margin: 0;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.55;
}

.lesson-brief strong {
  display: block;
  margin-top: 6px;
  color: var(--ink);
  font-size: 11px;
}

.visual-stage {
  min-height: 420px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    linear-gradient(90deg, rgba(15, 118, 110, 0.04) 0, transparent 42%),
    linear-gradient(#eef3f6 1px, transparent 1px),
    linear-gradient(90deg, #eef3f6 1px, transparent 1px),
    #ffffff;
  background-size:
    100% 100%,
    24px 24px,
    24px 24px,
    100% 100%;
}

.stage-toolbar,
.panel-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}

.stage-toolbar span,
.panel-heading span {
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
}

.stage-toolbar strong,
.panel-heading strong {
  color: var(--ink);
  font-size: 12px;
}

.token-flow {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.token-chip {
  display: inline-grid;
  min-width: 68px;
  min-height: 54px;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--ink);
  background: #ffffff;
  text-align: left;
}

.token-chip span {
  overflow: hidden;
  font-size: 13px;
  font-weight: 800;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.token-chip small {
  margin-top: 4px;
  color: var(--soft);
  font-size: 10px;
  font-weight: 800;
}

.token-chip.subword {
  border-color: #ffd7c8;
  background: var(--coral-soft);
}

.token-chip.number {
  border-color: #ffe0a3;
  background: var(--amber-soft);
}

.token-chip.symbol {
  border-color: #c9dcff;
  background: var(--blue-soft);
}

.token-chip.is-focused {
  color: #ffffff;
  border-color: #0e5968;
  background: #123c4a;
}

.token-analysis-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin-top: 16px;
}

.analysis-lane,
.nearest-panel,
.answer-card,
.json-panel,
.tool-validation,
.tool-result,
.metric-board,
.case-table,
.prompt-editor,
.trace-panel {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.92);
}

.analysis-lane {
  min-height: 166px;
  padding: 14px;
}

.analysis-lane h3,
.nearest-panel h3,
.source-list h3,
.tool-result h3 {
  margin: 0 0 10px;
  color: var(--ink);
  font-size: 14px;
}

.analysis-lane p,
.nearest-panel p,
.tool-result p {
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.55;
}

.char-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

.char-strip span {
  display: grid;
  place-items: center;
  min-width: 28px;
  height: 30px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #f8fbfc;
  font-size: 12px;
  font-weight: 800;
}

.budget-meter,
.compute-row div,
.metric-row div {
  height: 11px;
  overflow: hidden;
  border-radius: 99px;
  background: #e8eef3;
}

.budget-meter span,
.compute-row i,
.metric-row i {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--teal), var(--blue));
}

.lookup-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  min-height: 52px;
  padding: 10px;
  border: 1px solid #d6e7ec;
  border-radius: var(--radius);
  background: #f4fafb;
  color: #244452;
  font-size: 12px;
}

.lookup-card strong {
  color: var(--blue);
  font-size: 16px;
}

.embedding-layout,
.attention-layout,
.block-layout,
.rag-grid,
.tool-layout,
.eval-layout {
  display: grid;
  gap: 14px;
}

.embedding-layout {
  grid-template-columns: minmax(0, 1fr) 260px;
}

.embedding-map {
  width: 100%;
  min-height: 330px;
}

.embedding-map rect {
  fill: rgba(255, 255, 255, 0.88);
  stroke: var(--line);
}

.embedding-map path {
  fill: none;
  stroke: url(#axisGradient);
  stroke-width: 2;
}

.embedding-map text {
  fill: #244452;
  font-size: 12px;
  font-weight: 800;
}

.embedding-map .axis-label {
  fill: var(--muted);
  font-size: 11px;
}

.cluster {
  opacity: 0.52;
  stroke-width: 1.4;
}

.cluster-0 {
  fill: var(--teal-soft);
  stroke: #82c9c1;
}

.cluster-1 {
  fill: var(--blue-soft);
  stroke: #a9c6ff;
}

.cluster-2 {
  fill: var(--amber-soft);
  stroke: #f0c16c;
}

.point {
  stroke: #ffffff;
  stroke-width: 2;
}

.focus-ring {
  fill: none;
  stroke: var(--coral);
  stroke-dasharray: 5 5;
  stroke-width: 2;
}

.nearest-panel {
  padding: 14px;
}

.nearest-row {
  display: grid;
  grid-template-columns: 24px minmax(0, 1fr);
  align-items: center;
  gap: 9px;
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
}

.nearest-row > span {
  display: grid;
  place-items: center;
  width: 24px;
  height: 24px;
  border-radius: 6px;
  color: #ffffff;
  background: var(--teal);
  font-size: 11px;
  font-weight: 900;
}

.nearest-row strong,
.source-row strong {
  display: block;
  color: var(--ink);
  font-size: 12px;
}

.nearest-row small {
  color: var(--muted);
  font-size: 11px;
}

.nearest-row meter {
  grid-column: 1 / -1;
  width: 100%;
  height: 8px;
}

.attention-layout {
  grid-template-columns: minmax(0, 1fr) 250px;
}

.heatmap-wrap {
  width: 100%;
  max-width: 100%;
  overflow-x: auto;
  padding-bottom: 4px;
}

.heatmap {
  display: grid;
  gap: 5px;
  width: max-content;
  min-width: 600px;
}

.heat-corner,
.heat-label,
.heat-row-label,
.heat-cell {
  display: grid;
  place-items: center;
  min-height: 36px;
  border: 1px solid var(--line);
  border-radius: 6px;
  font-size: 11px;
  font-weight: 800;
}

.heat-corner {
  color: var(--muted);
  background: #f8fbfc;
}

.heat-label,
.heat-row-label {
  overflow: hidden;
  color: var(--ink);
  background: #ffffff;
  text-overflow: ellipsis;
}

.heat-label.is-focused,
.heat-row-label.is-focused {
  color: #ffffff;
  border-color: #0e5968;
  background: #123c4a;
}

.heat-cell {
  border-color: rgba(15, 118, 146, 0.24);
}

.heat-cell.is-related {
  outline: 2px solid rgba(226, 88, 79, 0.28);
  outline-offset: 1px;
}

.qkv-panel {
  display: grid;
  gap: 10px;
}

.qkv-card,
.distribution-card {
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.94);
}

.qkv-card span,
.candidate-row span,
.compute-row span,
.metric-row span {
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
}

.qkv-card strong {
  display: block;
  margin-top: 5px;
  color: var(--ink);
  font-size: 13px;
}

.qkv-card small {
  display: block;
  margin-top: 3px;
  color: var(--soft);
  font-size: 11px;
}

.distribution-card h3 {
  margin: 0;
  color: var(--ink);
  font-size: 13px;
}

.distribution-card > div:first-child {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
}

.candidate-row {
  display: grid;
  grid-template-columns: 78px minmax(0, 1fr);
  align-items: center;
  gap: 8px;
  padding: 6px 0;
}

.candidate-row meter {
  width: 100%;
}

.block-layout {
  grid-template-columns: 290px minmax(0, 1fr);
}

.block-stack {
  display: grid;
  gap: 10px;
}

.block-node {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  align-items: center;
  gap: 10px;
  min-height: 66px;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #ffffff;
}

.block-node > span {
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border-radius: 6px;
  color: #ffffff;
  background: #78909c;
  font-size: 12px;
  font-weight: 900;
}

.block-node strong {
  display: block;
  color: var(--ink);
  font-size: 13px;
}

.block-node small {
  color: var(--muted);
  font-size: 11px;
}

.block-node.is-active {
  border-color: #93d5d0;
  background: var(--teal-soft);
}

.block-node.is-active > span {
  background: var(--teal);
}

.residual-diagram {
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.92);
}

.residual-diagram svg {
  width: 100%;
  max-height: 270px;
}

.signal-line {
  fill: none;
  stroke: var(--blue);
  stroke-width: 4;
}

.signal-line.alt {
  stroke: var(--coral);
  stroke-dasharray: 9 8;
}

.diagram-box {
  stroke-width: 2;
}

.diagram-box.attention {
  fill: var(--blue-soft);
  stroke: #93b7ff;
}

.diagram-box.mlp {
  fill: var(--amber-soft);
  stroke: #f0c16c;
}

.residual-diagram text {
  fill: var(--ink);
  font-size: 14px;
  font-weight: 900;
}

.junction {
  fill: var(--blue);
  stroke: #ffffff;
  stroke-width: 4;
}

.junction.alt {
  fill: var(--coral);
}

.compute-bars {
  display: grid;
  gap: 10px;
  margin-top: 12px;
}

.compute-row,
.metric-row {
  display: grid;
  grid-template-columns: 118px minmax(0, 1fr) 34px;
  align-items: center;
  gap: 10px;
}

.rag-pipeline {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
}

.pipeline-step {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
  gap: 8px;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #ffffff;
}

.pipeline-step span {
  display: grid;
  place-items: center;
  width: 28px;
  height: 28px;
  border-radius: 6px;
  color: #ffffff;
  background: #78909c;
  font-size: 11px;
  font-weight: 900;
}

.pipeline-step strong {
  flex: 1;
  color: var(--ink);
  font-size: 12px;
}

.pipeline-step svg {
  color: var(--soft);
}

.pipeline-step.is-active {
  border-color: #93b7ff;
  background: var(--blue-soft);
}

.pipeline-step.is-active span {
  background: var(--blue);
}

.rag-grid {
  grid-template-columns: minmax(0, 1fr) 300px;
  margin-top: 14px;
}

.source-list {
  display: grid;
  gap: 10px;
}

.source-row {
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #ffffff;
}

.source-row div {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.source-row span {
  color: var(--teal);
  font-size: 11px;
  font-weight: 900;
}

.source-row p {
  margin: 8px 0;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.5;
}

.source-row meter {
  width: 100%;
}

.answer-card {
  display: grid;
  align-content: start;
  gap: 12px;
  padding: 14px;
  background: #f7fbff;
}

.answer-header {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--blue);
  font-size: 13px;
}

.answer-card p {
  margin: 0;
  color: var(--ink);
  font-size: 14px;
  line-height: 1.6;
}

.citation-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
}

.citation-strip span {
  padding: 6px 8px;
  border-radius: 6px;
  color: #1d4d55;
  background: var(--teal-soft);
  font-size: 11px;
  font-weight: 800;
}

.tool-layout {
  grid-template-columns: minmax(0, 1fr) 260px 210px;
}

.json-panel {
  overflow: hidden;
}

.code-window-title {
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 40px;
  padding: 0 12px;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  background: #f7fafc;
  font-size: 12px;
  font-weight: 900;
}

.json-panel pre,
.trace-panel pre {
  margin: 0;
  overflow: auto;
  color: #d8f7ef;
  background: #102a35;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 12px;
  line-height: 1.65;
}

.json-panel pre {
  min-height: 256px;
  padding: 18px;
}

.tool-validation,
.tool-result {
  display: grid;
  align-content: start;
  gap: 10px;
  padding: 12px;
}

.validation-row {
  display: grid;
  grid-template-columns: 20px minmax(0, 1fr);
  gap: 8px;
  padding: 9px;
  border-radius: 6px;
  background: #f8fbfc;
}

.validation-row.pass svg {
  color: var(--teal);
}

.validation-row.warn svg {
  color: var(--amber);
}

.validation-row strong {
  display: block;
  color: var(--ink);
  font-size: 12px;
}

.validation-row span {
  color: var(--muted);
  font-size: 11px;
  line-height: 1.35;
}

.metric-tile {
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #f8fbfc;
}

.metric-tile span {
  display: block;
  color: var(--muted);
  font-size: 11px;
  font-weight: 800;
}

.metric-tile strong {
  display: block;
  margin-top: 5px;
  color: var(--ink);
  font-size: 24px;
}

.eval-layout {
  grid-template-columns: 300px minmax(0, 1fr);
}

.metric-board,
.case-table {
  padding: 14px;
}

.metric-board {
  display: grid;
  gap: 16px;
}

.metric-row strong {
  color: var(--ink);
  font-size: 12px;
  text-align: right;
}

.case-table {
  overflow-x: auto;
}

.case-header,
.case-row {
  display: grid;
  grid-template-columns: minmax(140px, 1fr) 82px 82px 72px;
  gap: 10px;
  align-items: center;
  min-width: 500px;
}

.case-header {
  padding: 0 0 10px;
  color: var(--muted);
  font-size: 11px;
  font-weight: 900;
  text-transform: uppercase;
}

.case-row {
  min-height: 48px;
  border-top: 1px solid var(--line);
  color: var(--text);
  font-size: 12px;
}

.case-row strong {
  color: var(--ink);
  font-size: 12px;
}

.risk {
  display: inline-grid;
  place-items: center;
  width: fit-content;
  min-width: 58px;
  height: 24px;
  padding: 0 8px;
  border-radius: 99px;
  font-size: 11px;
  font-weight: 900;
}

.risk.low {
  color: #0f5d55;
  background: var(--teal-soft);
}

.risk.medium {
  color: #7c5400;
  background: var(--amber-soft);
}

.risk.high {
  color: #9d332d;
  background: var(--coral-soft);
}

.prompt-trace {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(310px, 0.8fr);
  gap: 14px;
  margin-top: 14px;
}

.prompt-editor,
.trace-panel {
  padding: 12px;
}

.prompt-editor textarea {
  display: block;
  width: 100%;
  min-height: 122px;
  resize: vertical;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--ink);
  background: #fbfdff;
  padding: 12px;
  font-size: 13px;
  line-height: 1.55;
}

.prompt-editor textarea:focus {
  border-color: var(--teal);
  outline: 3px solid rgba(15, 118, 110, 0.16);
}

.trace-panel pre {
  min-height: 122px;
  padding: 12px;
  border-radius: var(--radius);
}

.training-layout,
.agent-layout,
.context-agent-grid,
.token-media-grid,
.diffusion-layout,
.timeline-layout {
  display: grid;
  min-width: 0;
  gap: 14px;
}

.training-layout {
  grid-template-columns: 260px minmax(0, 1fr);
}

.training-pipeline {
  display: grid;
  gap: 8px;
}

.train-step,
.timeline-node,
.mode-tabs button {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--text);
  background: rgba(255, 255, 255, 0.92);
}

.train-step {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  min-height: 58px;
  gap: 8px;
  align-items: center;
  padding: 9px;
  text-align: left;
}

.train-step span,
.arch-node span {
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  border-radius: 6px;
  color: #ffffff;
  background: #78909c;
  font-size: 11px;
  font-weight: 900;
}

.train-step strong,
.arch-node strong,
.timeline-node strong {
  display: block;
  color: var(--ink);
  font-size: 12px;
}

.train-step small,
.arch-node small,
.timeline-node small {
  color: var(--muted);
  font-size: 11px;
}

.train-step.is-active,
.timeline-node.is-active,
.mode-tabs button.is-selected {
  border-color: #93d5d0;
  background: var(--teal-soft);
}

.train-step.is-active span,
.arch-node:hover span,
.timeline-node.is-active span {
  background: var(--teal);
}

.training-detail,
.arch-explain,
.context-budget,
.mcp-card,
.media-token-card,
.patch-card,
.denoise-panel,
.video-sync-panel,
.timeline-detail {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.92);
}

.training-detail {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  gap: 12px;
  padding: 14px;
}

.training-copy h3,
.arch-explain h3,
.media-token-card h3,
.timeline-detail h3 {
  margin: 0 0 8px;
  color: var(--ink);
  font-size: 16px;
}

.training-copy p,
.arch-explain p,
.video-sync-panel p,
.timeline-detail p,
.context-advice {
  margin: 0;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.58;
}

.risk-note {
  display: grid;
  grid-template-columns: 18px minmax(0, 1fr);
  gap: 8px;
  margin-top: 12px;
  padding: 10px;
  border: 1px solid #f0c16c;
  border-radius: var(--radius);
  color: #705000;
  background: var(--amber-soft);
  font-size: 12px;
  line-height: 1.45;
}

.train-curve {
  width: 100%;
  min-height: 230px;
}

.curve-grid {
  stroke: #e5edf2;
  stroke-width: 1;
}

.loss-curve {
  fill: none;
  stroke: var(--blue);
  stroke-width: 4;
}

.train-curve circle {
  fill: #a9c6ff;
  stroke: #ffffff;
  stroke-width: 3;
}

.train-curve .is-active circle {
  fill: var(--coral);
}

.train-curve text {
  fill: var(--muted);
  font-size: 11px;
  font-weight: 800;
}

.mode-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 14px;
}

.mode-tabs button {
  min-height: 34px;
  padding: 0 12px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 900;
}

.mode-tabs button.is-selected {
  color: var(--ink);
}

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

.arch-map {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 8px;
  padding-bottom: 4px;
}

.arch-node {
  display: grid;
  align-content: start;
  min-width: 0;
  min-height: 104px;
  gap: 8px;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #ffffff;
}

.arch-connector {
  display: none;
}

.arch-explain {
  padding: 14px;
}

.arch-explain ul {
  display: grid;
  gap: 6px;
  margin: 12px 0 0;
  padding-left: 18px;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.45;
}

.context-agent-grid,
.token-media-grid,
.diffusion-layout {
  grid-template-columns: minmax(0, 1fr) minmax(260px, 0.82fr);
  margin-top: 14px;
}

.context-budget,
.mcp-card,
.media-token-card,
.patch-card,
.denoise-panel,
.video-sync-panel,
.timeline-detail {
  padding: 14px;
}

.context-stack {
  display: flex;
  overflow: hidden;
  height: 18px;
  border-radius: 99px;
  background: #e8eef3;
}

.context-stack span {
  min-width: 5px;
}

.context-rows {
  display: grid;
  gap: 8px;
  margin-top: 12px;
}

.context-rows div {
  display: grid;
  grid-template-columns: 88px minmax(0, 1fr) 38px;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: 11px;
  font-weight: 800;
}

.context-rows meter {
  width: 100%;
}

.context-advice {
  margin-top: 12px;
  padding: 9px;
  border-radius: 6px;
  background: #f3f8fb;
}

.mcp-graph-mini {
  display: grid;
  grid-template-columns: 1fr 18px 1fr 18px 1fr 18px 1fr;
  align-items: center;
  gap: 6px;
}

.mcp-graph-mini span {
  display: grid;
  place-items: center;
  min-height: 48px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #f8fbfc;
  color: var(--ink);
  font-size: 12px;
  font-weight: 900;
  text-align: center;
}

.mcp-graph-mini i {
  height: 2px;
  background: var(--line-strong);
}

.sandbox-list {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin-top: 14px;
}

.sandbox-list span {
  padding: 6px 8px;
  border-radius: 999px;
  color: #174844;
  background: var(--teal-soft);
  font-size: 11px;
  font-weight: 900;
}

.media-map .arch-node {
  min-width: 116px;
}

.token-flow.compact {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-bottom: 14px;
}

.mini-token {
  padding: 6px 7px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #f8fbfc;
  color: var(--ink);
  font-size: 11px;
  font-weight: 900;
}

.mini-token.subword {
  background: var(--coral-soft);
}

.mini-token.symbol {
  background: var(--blue-soft);
}

.media-token-card strong {
  color: var(--teal);
  font-size: 13px;
}

.patch-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
  color: var(--muted);
  font-size: 11px;
  font-weight: 900;
  text-transform: uppercase;
}

.patch-head b {
  color: var(--ink);
}

.patch-grid-mini,
.denoise-grid {
  display: grid;
  gap: 3px;
}

.patch-grid-mini {
  min-height: 220px;
}

.patch-grid-mini span,
.denoise-grid span {
  min-height: 12px;
  border-radius: 3px;
  background: linear-gradient(135deg, #dff5f1, #e6f0ff);
}

.denoise-grid {
  grid-template-columns: repeat(12, 1fr);
  min-height: 230px;
  padding: 8px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #f8fbfc;
}

.denoise-meter {
  margin-top: 12px;
}

.video-timeline {
  display: grid;
  gap: 12px;
}

.sync-row {
  display: grid;
  grid-template-columns: 70px repeat(9, minmax(12px, 1fr));
  align-items: center;
  gap: 5px;
}

.sync-row strong {
  color: var(--ink);
  font-size: 12px;
}

.sync-row span {
  height: 20px;
  border-radius: 5px;
  background: #e8eef3;
}

.sync-row span.is-active {
  background: linear-gradient(90deg, var(--teal), var(--blue));
}

.video-sync-panel p {
  margin-top: 14px;
}

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

.timeline-strip {
  display: grid;
  grid-template-columns: repeat(4, minmax(130px, 1fr));
  gap: 10px;
}

.timeline-node {
  display: grid;
  min-height: 92px;
  padding: 11px;
  text-align: left;
}

.timeline-node span,
.timeline-detail span {
  color: var(--teal);
  font-size: 11px;
  font-weight: 900;
  text-transform: uppercase;
}

.timeline-detail a {
  display: inline-flex;
  margin-top: 12px;
  color: var(--blue);
  font-size: 12px;
  font-weight: 900;
}

.model-matrix {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
  margin-top: 14px;
}

.model-matrix article {
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #ffffff;
}

.model-matrix b {
  display: block;
  color: var(--ink);
  font-size: 12px;
}

.model-matrix span {
  display: block;
  margin-top: 6px;
  color: var(--muted);
  font-size: 11px;
  line-height: 1.45;
}

@media (max-width: 1180px) {
  .topbar {
    align-items: flex-start;
    height: auto;
    padding: 14px 18px;
    flex-direction: column;
  }

  .topbar-controls {
    width: 100%;
    justify-content: flex-start;
    flex-wrap: wrap;
  }

  .workspace {
    grid-template-columns: 220px minmax(0, 1fr);
  }

}

@media (max-width: 900px) {
  .workspace {
    display: block;
    width: 100%;
    max-width: 100%;
    overflow-x: hidden;
    padding: 12px;
  }

  .lesson-rail,
  .lab-surface {
    width: 100%;
    max-width: 100%;
    margin-bottom: 12px;
  }

  .lesson-rail {
    position: static;
    overflow: hidden;
  }

  .lesson-list {
    display: grid;
    grid-auto-columns: 210px;
    grid-auto-flow: column;
    grid-template-columns: none;
    width: 100%;
    max-width: 100%;
    overflow-x: auto;
    padding-bottom: 2px;
  }

  .lesson-button {
    min-width: 210px;
  }

  .lab-surface,
  .lesson-rail {
    box-shadow: none;
  }

  .embedding-layout,
  .attention-layout,
  .block-layout,
  .rag-grid,
  .tool-layout,
  .eval-layout,
  .lesson-brief,
  .training-layout,
  .training-detail,
  .agent-layout,
  .context-agent-grid,
  .token-media-grid,
  .diffusion-layout,
  .timeline-layout,
  .prompt-trace,
  .token-analysis-grid {
    grid-template-columns: 1fr;
  }

  .timeline-strip,
  .model-matrix {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .arch-map {
    max-width: 100%;
  }

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

}

@media (max-width: 640px) {
  html,
  body,
  .app-shell {
    width: 100%;
    max-width: 100%;
    overflow-x: hidden;
  }

  .topbar {
    padding: 12px;
  }

  .brand {
    min-width: 0;
  }

  .brand-subtitle {
    display: none;
  }

  .temperature-control {
    grid-template-columns: 1fr 94px 34px;
    width: 100%;
  }

  .segmented-control {
    width: 100%;
  }

  .segmented-control button {
    min-width: 0;
    flex: 1;
  }

  .run-button {
    width: 100%;
  }

  .lab-surface {
    padding: 12px;
  }

  .lab-heading h1 {
    font-size: 24px;
  }

  .module-progress {
    width: 54px;
    height: 54px;
  }

  .visual-stage {
    min-height: 360px;
    padding: 10px;
  }

  .rag-pipeline,
  .timeline-strip,
  .model-matrix {
    grid-template-columns: 1fr;
  }

  .training-pipeline,
  .timeline-strip {
    max-height: 340px;
    overflow-y: auto;
  }

  .mcp-graph-mini {
    grid-template-columns: 1fr;
  }

  .mcp-graph-mini i {
    width: 2px;
    height: 16px;
    justify-self: center;
  }

  .sync-row {
    grid-template-columns: 58px repeat(9, minmax(8px, 1fr));
  }

  .patch-grid-mini,
  .denoise-grid {
    min-height: 180px;
  }

  .source-row div {
    align-items: flex-start;
    flex-direction: column;
  }
}