.lecture-page {
  background:
    linear-gradient(to right, rgba(223,229,220,.72) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(223,229,220,.72) 1px, transparent 1px),
    radial-gradient(circle at 88% 8%, rgba(244,176,94,.18), transparent 22rem),
    var(--bg);
  background-size: 80px 80px, 80px 80px, auto, auto;
}

.lecture-page section[id] {
  scroll-margin-top: 92px;
}

button.btn {
  cursor: pointer;
  font: inherit;
}

.section-return {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  margin-top: 1rem;
  padding: .5rem .85rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255,255,255,.78);
  color: var(--slate);
  font-size: .88rem;
  font-weight: 800;
  line-height: 1.2;
  text-decoration: none;
  transition: transform .2s ease, border-color .2s ease, background .2s ease, color .2s ease;
}

.section-return::before {
  content: "↑";
  margin-right: .45rem;
  color: #6a8f57;
}

.section-return:hover {
  border-color: #6a8f57;
  background: #edf3e4;
  color: var(--ink);
  transform: translateY(-1px);
}

.lecture-shell {
  width: min(1120px, calc(100vw - 2rem));
  margin: 0 auto;
}

.lecture-hero {
  padding: 7rem 2rem 5rem;
  border-bottom: 1px solid var(--line);
}

.lecture-hero-grid,
.split {
  display: grid;
  grid-template-columns: minmax(0, .98fr) minmax(320px, 1.02fr);
  gap: 3rem;
  align-items: center;
}

.lecture-copy h1 {
  font-size: clamp(2.8rem, 6vw, 5.9rem);
  line-height: 1.05;
  max-width: 920px;
}

.lecture-console,
.interactive-panel,
.simulator-card,
.prompt-builder,
.agent-lab,
.roadmap-detail,
.state-panel,
.meaning-panel,
.usage-panel {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255,255,255,.92);
  box-shadow: var(--shadow);
}

.lecture-console {
  background: #101813;
  color: #dfe8dd;
  padding: 1.2rem;
  box-shadow: 0 22px 54px rgba(23,32,27,.22);
}

.console-top {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid rgba(223,229,220,.14);
}

.console-top strong {
  color: white;
}

.console-top span {
  color: #d5f18a;
  font-size: .86rem;
  font-weight: 800;
}

.console-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .75rem;
  margin-top: 1rem;
}

.console-grid div,
.console-flow span {
  border: 1px solid rgba(223,229,220,.14);
  border-radius: 8px;
  background: rgba(255,255,255,.055);
  padding: 1rem;
}

.console-grid strong {
  display: block;
  color: #d5f18a;
  font-size: 2rem;
  line-height: 1;
}

.console-grid span {
  display: block;
  margin-top: .35rem;
  color: #b9c5bc;
  font-size: .86rem;
}

.console-flow {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: .55rem;
  margin-top: .85rem;
}

.console-flow span {
  text-align: center;
  color: #dfe8dd;
  font-size: .82rem;
  font-weight: 800;
}

.path-stepper {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: .8rem;
}

.lecture-step,
.basics-tab,
.tool-filter,
.concept-layer,
.timeline-node,
.roadmap-node,
.prompt-actions button,
.state-node,
.meaning-node {
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255,255,255,.9);
  color: var(--slate);
  cursor: pointer;
  font: inherit;
  font-weight: 800;
  line-height: 1.25;
  transition: transform .2s ease, border-color .2s ease, background .2s ease, color .2s ease;
}

.lecture-step {
  min-height: 92px;
  border-radius: 8px;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: .8rem;
  align-items: center;
  padding: 1rem 1.1rem;
  text-align: left;
}

.lecture-step-number,
.lecture-step-label {
  display: block;
}

.lecture-step-number {
  color: #6a8f57;
  font-size: .78rem;
  font-weight: 900;
  letter-spacing: .08em;
}

.lecture-step-label {
  color: inherit;
  line-height: 1.35;
}

.lecture-step.active,
.lecture-step:hover,
.basics-tab.active,
.tool-filter.active,
.concept-layer.active,
.timeline-node.active,
.roadmap-node.active,
.prompt-actions button:hover,
.state-node.active,
.meaning-node.active {
  border-color: #6a8f57;
  background: #edf3e4;
  color: var(--ink);
  transform: translateY(-2px);
}

.state-node:hover,
.meaning-node:hover {
  border-color: rgba(106,143,87,.45);
  background: white;
  color: var(--ink);
  transform: translateY(-1px);
}

.state-node.active:hover,
.meaning-node.active:hover {
  border-color: #6a8f57;
  background: #edf3e4;
  transform: translateY(-2px);
}

.path-example {
  border-radius: 8px;
  background: #101813;
  color: #dfe8dd;
  padding: 1.2rem;
  line-height: 1.7;
}

.state-panel,
.meaning-panel {
  padding: 1.25rem;
}

.state-summary,
.meaning-summary {
  display: grid;
  grid-template-columns: minmax(0, .95fr) minmax(280px, .75fr);
  gap: 1rem;
  align-items: end;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--line);
}

.state-summary h3,
.meaning-summary h3 {
  margin: .5rem 0 0;
  font-size: clamp(1.55rem, 2.4vw, 2.05rem);
  line-height: 1.12;
}

.state-summary p,
.meaning-summary p {
  margin: 0;
  color: var(--slate);
  line-height: 1.8;
}

.state-grid,
.meaning-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: .8rem;
  margin-top: 1rem;
}

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

.state-grid article,
.meaning-grid article {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(247,250,244,.86);
  padding: 1rem;
  min-height: 150px;
}

.state-grid strong,
.state-grid span,
.meaning-grid strong,
.meaning-grid span {
  display: block;
}

.state-grid strong,
.meaning-grid strong {
  color: var(--ink);
  font-size: 1rem;
  line-height: 1.35;
}

.state-grid span,
.meaning-grid span {
  margin-top: .55rem;
  color: var(--slate);
  font-size: .93rem;
  line-height: 1.65;
}

.state-map,
.meaning-map {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: .75rem;
  margin-top: 1.1rem;
}

.state-node,
.meaning-node {
  border-radius: 8px;
  min-height: 92px;
  padding: 1rem;
  text-align: left;
}

.state-node span,
.state-node strong,
.meaning-node span,
.meaning-node strong {
  display: block;
}

.state-node span,
.meaning-node span {
  color: #6a8f57;
  font-size: .78rem;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.state-node strong,
.meaning-node strong {
  margin-top: .25rem;
  color: inherit;
}

.state-detail,
.meaning-detail {
  display: grid;
  grid-template-columns: minmax(180px, .35fr) minmax(0, 1fr);
  gap: 1rem;
  align-items: start;
  margin-top: 1rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: white;
  padding: 1rem;
}

.state-detail span,
.meaning-detail span {
  display: inline-block;
  color: #6a8f57;
  font-size: .82rem;
  font-weight: 900;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.state-detail h3,
.meaning-detail h3 {
  margin: .3rem 0 0;
  font-size: 1.35rem;
}

.state-detail p,
.meaning-detail p {
  margin: 0;
  color: var(--slate);
  line-height: 1.75;
}

.state-cases,
.meaning-cases {
  display: grid;
  gap: .7rem;
}

.state-cases article,
.meaning-cases article {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(247,250,244,.78);
  padding: .85rem;
}

.state-cases strong,
.state-cases span,
.meaning-cases strong,
.meaning-cases span {
  display: block;
}

.state-cases strong,
.meaning-cases strong {
  color: var(--ink);
  font-size: .95rem;
}

.state-cases span,
.meaning-cases span {
  margin-top: .35rem;
  color: var(--slate);
  font-size: .9rem;
  line-height: 1.6;
}

.state-case-link {
  display: inline-flex;
  margin-top: .65rem;
  color: var(--ink);
  font-size: .86rem;
  font-weight: 900;
  text-decoration: none;
  border-bottom: 1px solid #6a8f57;
}

.state-callout,
.meaning-callout {
  margin-top: 1rem;
  border-radius: 8px;
  background: #101813;
  color: #dfe8dd;
  padding: 1rem;
  line-height: 1.8;
}

.usage-panel {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  padding: 1.25rem;
}

.usage-column {
  display: grid;
  gap: .85rem;
  align-content: start;
}

.usage-column-head {
  min-height: 138px;
  border-radius: 8px;
  padding: 1.1rem;
}

.usage-column-head span {
  display: inline-block;
  font-size: .82rem;
  font-weight: 900;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.usage-column-head h3 {
  margin: .5rem 0 0;
  font-size: clamp(1.55rem, 2.4vw, 2.05rem);
  line-height: 1.13;
}

.usage-column article {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: white;
  padding: 1rem;
}

.usage-column article strong {
  display: block;
  color: var(--ink);
  font-size: 1rem;
  line-height: 1.35;
}

.usage-column article p {
  margin: .45rem 0 0;
  color: var(--slate);
  font-size: .94rem;
  line-height: 1.7;
}

.usage-good .usage-column-head {
  border: 1px solid rgba(106,143,87,.45);
  background: #edf3e4;
}

.usage-good .usage-column-head span {
  color: #3f6f57;
}

.usage-bad .usage-column-head {
  border: 1px solid rgba(138,90,31,.34);
  background: rgba(255,247,223,.82);
}

.usage-bad .usage-column-head span {
  color: #8a5a1f;
}

.usage-bad article {
  background: rgba(255,250,236,.74);
}

.interactive-panel {
  padding: 1rem;
}

.basics-tabs,
.tool-filters {
  display: flex;
  gap: .6rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}

.basics-tab,
.tool-filter,
.timeline-node,
.roadmap-node,
.prompt-actions button {
  padding: .65rem 1rem;
}

.basics-pane {
  display: none;
}

.basics-pane.active {
  display: block;
}

.concept-map {
  display: grid;
  grid-template-columns: minmax(260px, 420px) minmax(0, 1fr);
  gap: 1rem;
  align-items: stretch;
  margin-bottom: 1rem;
}

.concept-stack {
  display: grid;
  grid-template-columns: 1fr;
  gap: .6rem;
}

.concept-stack span {
  width: 2px;
  height: 16px;
  background: var(--line);
  justify-self: center;
}

.concept-layer {
  min-height: 64px;
  border-radius: 8px;
  font-size: 1.2rem;
}

.relation-graph {
  border: 1px solid var(--line);
  border-radius: 8px;
  background:
    linear-gradient(135deg, rgba(237,243,228,.92), rgba(255,255,255,.96)),
    white;
  padding: 1rem;
  display: grid;
  gap: .75rem;
}

.relation-node {
  border: 1px solid rgba(106,143,87,.34);
  border-radius: 8px;
  background: rgba(255,255,255,.8);
  padding: .85rem;
  transition: border-color .2s ease, background .2s ease, box-shadow .2s ease;
}

.relation-node strong {
  display: block;
  color: var(--ink);
}

.relation-node span {
  display: block;
  margin-top: .3rem;
  color: var(--slate);
  font-size: .84rem;
  line-height: 1.45;
}

.relation-node .relation-node {
  margin-top: .7rem;
  margin-left: 1rem;
}

.relation-ai {
  background: #f0f4ea;
}

.relation-ml {
  background: #fffdf3;
}

.relation-llm {
  background: #f7f8f3;
}

.relation-gpt {
  background: #101813;
  border-color: #6a8f57;
}

.relation-gpt strong {
  color: #d5f18a;
}

.relation-gpt span {
  color: #dfe8dd;
}

.relation-node.active {
  border-color: #17201b;
  box-shadow: inset 0 0 0 2px rgba(23,32,27,.12);
}

.relation-legend {
  border-top: 1px solid var(--line);
  padding-top: .7rem;
  display: flex;
  flex-wrap: wrap;
  gap: .45rem .75rem;
  align-items: center;
  color: var(--slate);
  font-size: .88rem;
}

.relation-legend b {
  color: var(--ink);
}

.concept-explain,
.timeline-detail,
.agent-detail,
.roadmap-detail {
  padding: 1.2rem;
}

.concept-explain,
.timeline-detail {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #f0f4ea;
}

.concept-types {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: .75rem;
  margin-top: .85rem;
}

.concept-types div {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: white;
  padding: .95rem;
}

.concept-types strong {
  display: block;
  color: var(--ink);
}

.concept-types span {
  display: block;
  margin-top: .35rem;
  color: var(--slate);
  font-size: .88rem;
  line-height: 1.55;
}

.concept-explain p,
.timeline-detail p,
.agent-detail p,
.roadmap-detail p {
  color: var(--slate);
  margin-bottom: 0;
}

.ability-slider label,
.field-label,
.compare-slider label {
  display: block;
  color: var(--ink);
  font-weight: 800;
  margin-bottom: .65rem;
}

.ability-slider input,
.compare-slider input {
  width: 100%;
  accent-color: #6a8f57;
}

.ability-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}

.ability-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--bg);
  padding: 1.1rem;
}

.ability-card ul {
  margin: .7rem 0 0;
  padding-left: 1.2rem;
  color: var(--slate);
}

.ability-note,
.compare-readout {
  margin-top: 1rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff7df;
  color: #6a4619;
  padding: 1rem;
}

.mini-timeline,
.roadmap {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: .7rem;
  margin-bottom: 1rem;
}

.simulator-card {
  padding: 1.2rem;
}

textarea,
input {
  font: inherit;
}

.simulator-card textarea,
.prompt-fields textarea,
.prompt-fields input,
.agent-input textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: white;
  color: var(--ink);
  padding: .85rem;
  resize: vertical;
  outline: none;
}

.simulator-card textarea:focus,
.prompt-fields textarea:focus,
.prompt-fields input:focus,
.agent-input textarea:focus {
  border-color: #6a8f57;
  box-shadow: 0 0 0 3px rgba(106,143,87,.12);
}

.token-meta {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
  margin: 1rem 0 .6rem;
  color: var(--slate);
}

.token-meta strong {
  color: var(--ink);
  font-size: 1.7rem;
}

.token-source {
  flex: 0 0 100%;
  color: var(--green);
  font-size: .84rem;
  font-weight: 800;
}

.context-bar {
  height: 12px;
  border-radius: 999px;
  background: #edf3e4;
  overflow: hidden;
}

.context-bar span {
  display: block;
  width: 0%;
  height: 100%;
  background: linear-gradient(90deg, #17201b, #6a8f57, #d5f18a);
  transition: width .25s ease;
}

.token-list {
  display: flex;
  flex-wrap: wrap;
  gap: .4rem;
  margin-top: 1rem;
}

.token-list span {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #f7f8f3;
  color: var(--ink);
  padding: .28rem .5rem;
  font-size: .82rem;
  font-weight: 800;
}

.foldout-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}

.foldout {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: white;
  box-shadow: var(--shadow);
  padding: 1rem;
  text-align: left;
  cursor: pointer;
}

.foldout strong {
  display: block;
  color: var(--ink);
}

.foldout span {
  display: none;
  margin-top: .6rem;
  color: var(--slate);
  line-height: 1.6;
}

.foldout.open span {
  display: block;
}

.context-loop-foldout {
  grid-column: 1 / -1;
}

.context-loop-foldout .foldout-summary {
  max-width: 760px;
}

.context-case {
  border-top: 1px solid var(--line);
  padding-top: 1rem;
}

.foldout.open .context-case {
  display: grid;
  gap: .75rem;
}

.foldout.open .context-case-head,
.foldout.open .context-round,
.foldout.open .context-case-rule {
  display: grid;
}

.context-case-head,
.context-round,
.context-case-rule {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #f8faf4;
  padding: .95rem;
}

.context-case-head {
  gap: .35rem;
}

.context-round {
  grid-template-columns: 86px minmax(0, .85fr) minmax(0, 1.25fr) 92px;
  gap: .85rem;
  align-items: center;
  background: white;
}

.context-round-user,
.context-round-model {
  margin: 0;
}

.context-round-user b,
.context-round-model b,
.context-case-head b,
.context-case-rule b {
  color: var(--ink);
  font-size: .98rem;
}

.context-round-user small,
.context-round-model small,
.context-case-head small,
.context-case-rule small {
  color: var(--slate);
  font-size: .88rem;
  line-height: 1.55;
}

.context-round-index {
  color: var(--green);
  font-size: .78rem;
  font-weight: 900;
  letter-spacing: .06em;
}

.context-round-cost {
  border: 1px solid #dce7d3;
  border-radius: 999px;
  background: #eef5e6;
  color: var(--green);
  font-size: .82rem;
  font-weight: 900;
  margin: 0;
  padding: .35rem .55rem;
  text-align: center;
}

.context-case-rule {
  background: var(--ink);
  border-color: var(--ink);
  gap: .35rem;
}

.context-case-rule b,
.context-case-rule small {
  color: white;
}

.prompt-builder {
  display: grid;
  grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr);
  gap: 1.1rem;
  padding: 1rem;
}

.prompt-simple {
  display: grid;
  gap: 1rem;
}

.prompt-scenario {
  display: grid;
  grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr);
  gap: 1rem;
  align-items: stretch;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: white;
  box-shadow: var(--shadow);
  padding: 1rem;
}

.prompt-scenario h3 {
  margin: .35rem 0 .55rem;
  color: var(--ink);
  font-size: clamp(1.35rem, 2.4vw, 2rem);
  line-height: 1.16;
}

.prompt-scenario p {
  margin: 0;
  color: var(--slate);
  font-weight: 700;
  line-height: 1.7;
}

.prompt-question-strip {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .75rem;
}

.prompt-question-card {
  display: grid;
  gap: .45rem;
  align-content: start;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #f8faf4;
  padding: .95rem;
}

.prompt-question-card span {
  color: var(--green);
  font-size: .78rem;
  font-weight: 900;
  letter-spacing: .06em;
}

.prompt-question-card strong {
  color: var(--ink);
  font-size: .95rem;
  line-height: 1.58;
}

.prompt-question-card.strong {
  border-color: rgba(83,126,66,.38);
  background: #eef5e6;
}

.prompt-fields {
  display: grid;
  gap: .85rem;
}

.prompt-fields label {
  color: var(--ink);
  font-weight: 800;
}

.prompt-fields input,
.prompt-fields textarea {
  margin-top: .4rem;
  font-weight: 400;
}

.prompt-output-wrap {
  display: grid;
  grid-template-rows: auto minmax(180px, auto);
  gap: .85rem;
}

.prompt-actions {
  display: flex;
  flex-wrap: wrap;
  gap: .45rem;
  align-items: center;
}

.prompt-actions button {
  min-height: 42px;
  padding: .62rem .9rem;
  font-size: .88rem;
}

#promptDemoButton {
  min-height: 42px;
  border: 1px solid #101813;
  border-radius: 999px;
  border-color: #101813;
  background: #101813;
  color: #f4f7ef;
  cursor: pointer;
  font: inherit;
  font-size: .88rem;
  font-weight: 800;
  line-height: 1.25;
  padding: .62rem 1rem;
  white-space: nowrap;
  transition: transform .2s ease, background .2s ease;
}

#promptDemoButton:hover {
  background: #17201b;
  transform: translateY(-2px);
}

.prompt-output {
  min-height: 180px;
  max-height: 280px;
  margin: 0;
  padding: 1rem;
  border-radius: 8px;
  background: #101813;
  color: #dfe8dd;
  font-family: "SF Mono", "Fira Code", Consolas, monospace;
  font-size: .84rem;
  line-height: 1.62;
  overflow: auto;
  white-space: pre-wrap;
}

.prompt-demo {
  grid-column: 1 / -1;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #f7f8f3;
  padding: 1rem;
}

.prompt-demo-head {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: center;
  color: var(--slate);
  font-size: .82rem;
}

.prompt-demo-head strong {
  display: block;
  color: var(--ink);
  font-size: 1.02rem;
}

.prompt-demo-head span {
  display: block;
  margin-top: .2rem;
}

.prompt-demo-list {
  display: grid;
  gap: .6rem;
  margin-top: .8rem;
}

.prompt-demo-row {
  display: grid;
  grid-template-columns: minmax(180px, .34fr) minmax(0, 1fr);
  gap: 1rem;
  align-items: flex-start;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255,255,255,.72);
  padding: .78rem .9rem;
}

.prompt-demo-row h3 {
  margin: 0 0 .28rem;
  color: var(--ink);
  font-size: .9rem;
}

.prompt-demo-row p {
  margin: 0;
  color: var(--slate);
  font-size: .76rem;
  line-height: 1.45;
}

.prompt-demo-output {
  margin: 0;
  color: var(--ink);
  font-family: inherit;
  font-size: .82rem;
  line-height: 1.52;
  overflow-x: auto;
}

.prompt-demo-output p {
  margin: 0;
}

.prompt-demo-output p + p,
.prompt-demo-output ul + p,
.prompt-demo-output ol + p,
.prompt-demo-output .md-table-wrap + p {
  margin-top: .5rem;
}

.prompt-demo-output ul,
.prompt-demo-output ol {
  margin: 0;
  padding-left: 1.1rem;
}

.prompt-demo-output li + li {
  margin-top: .25rem;
}

.prompt-demo-output code {
  border-radius: 4px;
  background: rgba(223,229,220,.7);
  padding: .05rem .25rem;
  font-size: .78rem;
}

.prompt-demo-output .md-table-wrap {
  width: 100%;
  overflow-x: auto;
}

.prompt-demo-output table {
  width: 100%;
  min-width: 460px;
  border-collapse: collapse;
  background: white;
  font-size: .78rem;
}

.prompt-demo-output th,
.prompt-demo-output td {
  border: 1px solid var(--line);
  padding: .45rem .5rem;
  text-align: left;
  vertical-align: top;
}

.prompt-demo-output th {
  background: #f7f8f3;
  font-weight: 800;
}

.prompt-demo-row.failed {
  border-color: rgba(138,90,31,.28);
  background: rgba(255,247,223,.72);
}

.prompt-demo-row.failed .prompt-demo-output {
  color: #8a5a1f;
}

.tool-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1rem;
}

.tool-card {
  min-height: 250px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: white;
  box-shadow: var(--shadow);
  padding: 1rem;
  cursor: pointer;
  transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
}

.tool-card:hover,
.tool-card.open {
  transform: translateY(-4px);
  border-color: #6a8f57;
  box-shadow: var(--shadow-hover);
}

.tool-card small {
  display: inline-flex;
  margin-bottom: .7rem;
  color: #3f6f57;
  font-weight: 800;
}

.tool-card p {
  color: var(--slate);
}

.tool-extra {
  max-height: 0;
  overflow: hidden;
  transition: max-height .25s ease;
}

.tool-card:hover .tool-extra,
.tool-card.open .tool-extra {
  max-height: 220px;
}

.tool-extra div {
  margin-top: .65rem;
  border-top: 1px solid var(--line);
  padding-top: .65rem;
  color: var(--slate);
  font-size: .9rem;
}

.agent-lab {
  display: grid;
  grid-template-columns: minmax(260px, .75fr) minmax(0, 1.25fr);
  gap: 1rem;
  padding: 1rem;
}

.agent-input {
  display: grid;
  gap: .85rem;
  align-content: start;
}

.agent-flow {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: .55rem;
}

.agent-step {
  min-height: 150px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #f7f8f3;
  padding: .9rem;
  cursor: pointer;
  position: relative;
}

.agent-step.active,
.agent-step:hover {
  border-color: #6a8f57;
  background: #edf3e4;
}

.agent-step::after {
  content: ">";
  position: absolute;
  right: -.45rem;
  top: 50%;
  transform: translateY(-50%);
  color: #6a8f57;
  font-weight: 800;
}

.agent-step:last-child::after {
  display: none;
}

.agent-step strong {
  display: block;
  margin-bottom: .35rem;
}

.agent-step span {
  color: var(--slate);
  font-size: .84rem;
}

.agent-detail {
  grid-column: 1 / -1;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #101813;
  color: #dfe8dd;
}

.agent-detail h3 {
  color: white;
}

.agent-detail p {
  color: #b9c5bc;
}

.agent-foldout {
  margin-top: 1rem;
}

.agent-shell-foldout {
  width: 100%;
  background: rgba(247,250,244,.9);
}

.agent-shell-foldout strong::before {
  content: "$";
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.55rem;
  height: 1.55rem;
  margin-right: .55rem;
  border-radius: 8px;
  background: #101813;
  color: #d5f18a;
  font-size: .9rem;
}

.agent-shell-foldout span {
  max-width: 920px;
}

.agent-shell-foldout .agent-shell-cases {
  max-width: none;
  margin-top: 1rem;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .75rem;
}

.foldout.open .agent-shell-cases {
  display: grid;
}

.agent-shell-case {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: white;
  padding: .85rem;
}

.agent-shell-case b,
.agent-shell-case code,
.agent-shell-case small {
  display: block;
}

.agent-shell-case b {
  color: var(--ink);
  font-size: .94rem;
}

.agent-shell-case code {
  margin-top: .5rem;
  border-radius: 6px;
  background: #101813;
  color: #d5f18a;
  padding: .55rem .65rem;
  font-family: "SF Mono", "Fira Code", Consolas, monospace;
  font-size: .76rem;
  line-height: 1.45;
  white-space: normal;
  word-break: break-word;
}

.agent-shell-case small {
  margin-top: .55rem;
  color: var(--slate);
  font-size: .84rem;
  line-height: 1.55;
}

.compare-slider {
  margin-top: 1rem;
}

.roadmap {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.roadmap-node {
  min-height: 68px;
  border-radius: 8px;
  position: relative;
}

.roadmap-node::after {
  content: "";
  position: absolute;
  top: 50%;
  right: -.72rem;
  width: .7rem;
  height: 2px;
  background: var(--line);
}

.roadmap-node:last-child::after {
  display: none;
}

.roadmap-detail {
  margin-top: 1rem;
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}

.metric-grid div {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: white;
  box-shadow: var(--shadow);
  padding: 1.1rem;
}

.metric-grid strong {
  display: block;
  color: var(--ink);
}

.metric-grid span {
  display: block;
  color: var(--slate);
  margin-top: .4rem;
}

.lecture-final {
  border-top: 1px solid var(--line);
  background: #101813;
  color: white;
}

.lecture-final h2,
.lecture-final .section-label {
  color: white;
}

.lecture-final .lead {
  color: #b9c5bc;
}

.final-inner {
  display: flex;
  justify-content: space-between;
  gap: 2rem;
  align-items: center;
}

.contact-modal {
  position: fixed;
  inset: 0;
  z-index: 1200;
  display: grid;
  place-items: center;
  padding: 1rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity .18s ease;
}

.contact-modal.open {
  opacity: 1;
  pointer-events: auto;
}

.contact-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(16,24,19,.62);
}

.contact-dialog {
  position: relative;
  width: min(420px, 100%);
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #f7f8f3;
  box-shadow: 0 24px 70px rgba(16,24,19,.28);
  padding: 1.25rem;
}

.contact-close {
  position: absolute;
  top: .75rem;
  right: .75rem;
  width: 2.25rem;
  height: 2.25rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: white;
  color: var(--ink);
  cursor: pointer;
  font: inherit;
  font-size: 1.35rem;
  font-weight: 800;
  line-height: 1;
}

.contact-copy {
  padding-right: 2.75rem;
}

.contact-copy h2 {
  margin: .45rem 0 0;
  color: var(--ink);
  font-size: 1.55rem;
}

.contact-copy p {
  margin: .45rem 0 1rem;
  color: var(--slate);
}

.contact-dialog img {
  display: block;
  width: min(100%, 340px);
  margin: 0 auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: white;
}

.contact-modal-open {
  overflow: hidden;
}

@media (max-width: 1000px) {
  .lecture-hero-grid,
  .split,
  .prompt-builder,
  .prompt-scenario,
  .agent-lab,
  .concept-map,
  .state-summary,
  .state-detail,
  .meaning-summary,
  .meaning-detail,
  .usage-panel {
    grid-template-columns: 1fr;
  }

  .path-stepper,
  .tool-grid,
  .metric-grid,
  .foldout-grid,
  .concept-types,
  .state-grid,
  .state-map,
  .meaning-grid,
  .meaning-map {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .context-round {
    grid-template-columns: 1fr;
    align-items: start;
  }

  .context-round-cost {
    justify-self: start;
  }

  .agent-flow {
    grid-template-columns: 1fr;
  }

  .agent-step::after,
  .roadmap-node::after {
    display: none;
  }

  .mini-timeline {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .final-inner {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (max-width: 760px) {
  .prompt-demo-head {
    align-items: flex-start;
    flex-direction: column;
  }

  #promptDemoButton {
    width: 100%;
  }

  .prompt-question-strip {
    grid-template-columns: 1fr;
  }

  .prompt-demo-row {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .lecture-page section[id] {
    scroll-margin-top: 128px;
  }

  .lecture-hero {
    padding: 5rem 1rem 3.5rem;
  }

  .lecture-shell {
    width: min(100%, calc(100vw - 2rem));
  }

  .lecture-copy h1 {
    font-size: clamp(2.15rem, 11vw, 3rem);
  }

  .console-grid,
  .console-flow,
  .path-stepper,
  .ability-grid,
  .tool-grid,
  .metric-grid,
  .foldout-grid,
  .concept-types,
  .state-grid,
  .state-map,
  .meaning-grid,
  .meaning-map,
  .agent-shell-foldout .agent-shell-cases,
  .roadmap,
  .mini-timeline {
    grid-template-columns: 1fr;
  }

  .lecture-step {
    min-height: 52px;
  }

  .section-return {
    width: 100%;
    justify-content: center;
  }

  .prompt-output {
    min-height: 170px;
    font-size: .78rem;
  }

  .token-meta {
    align-items: flex-start;
    flex-direction: column;
  }
}