:root {
  color-scheme: dark;
  --ink: #f5f1e8;
  --ink-soft: #b9b5ad;
  --paper: #f2efe7;
  --paper-ink: #171a1d;
  --paper-soft: #5a5d5f;
  --night: #101316;
  --night-2: #171b20;
  --line: rgba(245, 241, 232, 0.18);
  --line-dark: rgba(23, 26, 29, 0.2);
  --lime: #b8f03a;
  --coral: #ff6f59;
  --cyan: #7dd9ff;
  --violet: #b7a4ff;
  --slide-width: 1600px;
  --slide-height: 900px;
  --scale: 1;
}

* { box-sizing: border-box; }

html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
  overflow: hidden;
  background: #080a0c;
}

body {
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--ink);
  -webkit-font-smoothing: antialiased;
}

button,
code { font: inherit; }

.viewport {
  position: fixed;
  inset: 0;
  overflow: hidden;
}

.deck {
  position: absolute;
  top: 50%;
  left: 50%;
  width: var(--slide-width);
  height: var(--slide-height);
  transform: translate(-50%, -50%) scale(var(--scale));
  transform-origin: center center;
  background: var(--night);
  box-shadow: 0 28px 90px rgba(0, 0, 0, 0.44);
}

.slide {
  position: absolute;
  inset: 0;
  display: none;
  overflow: hidden;
  padding: 70px 92px 78px;
  background:
    radial-gradient(circle at 82% 16%, rgba(125, 217, 255, 0.08), transparent 29%),
    linear-gradient(135deg, var(--night) 0%, var(--night-2) 100%);
}

.slide.is-active {
  display: block;
  animation: slide-in 260ms ease-out both;
}

.slide-light {
  color: var(--paper-ink);
  background:
    linear-gradient(90deg, rgba(23, 26, 29, 0.04) 1px, transparent 1px) 0 0 / 80px 80px,
    linear-gradient(0deg, rgba(23, 26, 29, 0.04) 1px, transparent 1px) 0 0 / 80px 80px,
    var(--paper);
}

@keyframes slide-in {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.eyebrow {
  display: inline-block;
  margin: 0 0 28px;
  color: var(--lime);
  font-size: 19px;
  font-weight: 760;
  letter-spacing: 0.16em;
  font-variant-ligatures: none;
}

.slide-light .eyebrow { color: #567200; }

h1,
h2,
h3,
p { margin-top: 0; }

h1,
h2,
h3,
.final-line,
.slide-claim { letter-spacing: -0.035em; }

h1 {
  max-width: 1160px;
  margin-bottom: 34px;
  font-size: 104px;
  font-weight: 760;
  line-height: 0.97;
}

h1 span { color: var(--coral); }

h2 {
  max-width: 1370px;
  margin-bottom: 18px;
  font-size: 56px;
  font-weight: 720;
  line-height: 1.04;
}

h3 {
  margin-bottom: 12px;
  font-size: 28px;
  line-height: 1.08;
}

.standfirst,
.lede {
  color: var(--ink-soft);
  font-size: 27px;
  line-height: 1.38;
}

.slide-light .standfirst,
.slide-light .lede { color: var(--paper-soft); }

.title-lockup {
  position: relative;
  z-index: 2;
  margin-top: 74px;
}

.title-lockup .lede { max-width: 820px; }

.cover-presenter {
  display: flex;
  flex-direction: column;
  gap: 5px;
  margin-top: 42px;
  font-size: 20px;
  line-height: 1.25;
}

.cover-presenter strong { font-size: 22px; }

.cover-presenter span { color: var(--ink-soft); }

.ambient {
  position: absolute;
  border-radius: 50%;
  filter: blur(12px);
  opacity: 0.88;
}

.ambient-a {
  width: 460px;
  height: 460px;
  right: -80px;
  top: -110px;
  background: radial-gradient(circle at 42% 42%, rgba(184, 240, 58, 0.25), rgba(184, 240, 58, 0));
}

.ambient-b {
  width: 520px;
  height: 520px;
  right: 80px;
  bottom: -330px;
  background: radial-gradient(circle, rgba(255, 111, 89, 0.18), rgba(255, 111, 89, 0));
}

.token-river {
  position: absolute;
  left: 92px;
  bottom: 68px;
  display: flex;
  gap: 7px;
  max-width: 1040px;
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 15px;
}

.token-river span {
  padding: 7px 10px;
  color: rgba(245, 241, 232, 0.5);
  border: 1px solid rgba(245, 241, 232, 0.12);
}

.token-river .action {
  color: var(--night);
  border-color: var(--lime);
  background: var(--lime);
}

.corner-thesis {
  position: absolute;
  right: 92px;
  bottom: 58px;
  margin: 0;
  color: var(--ink);
  font-size: 22px;
  font-weight: 630;
  line-height: 1.35;
  text-align: right;
}

.harness-title-lockup {
  margin-top: 20px;
}

.harness-title-lockup h1 {
  max-width: 1260px;
  margin-bottom: 20px;
  font-size: 72px;
  line-height: 1;
}

.harness-title-lockup .lede {
  max-width: 1180px;
  margin-bottom: 0;
  font-size: 25px;
}

.token-message-bridge {
  display: grid;
  grid-template-columns: 1fr 270px 1fr;
  margin-top: 34px;
  border-top: 2px solid var(--ink);
  border-bottom: 1px solid var(--line);
}

.token-message-bridge article {
  min-height: 305px;
  padding: 25px 42px 22px 0;
}

.token-message-bridge article:last-child {
  padding-right: 0;
  padding-left: 42px;
}

.token-message-bridge article > span {
  color: var(--ink-soft);
  font-size: 15px;
  font-weight: 760;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.token-message-bridge h3 {
  margin-top: 18px;
  margin-bottom: 18px;
  font-size: 29px;
}

.bridge-fields {
  display: grid;
  gap: 8px;
  padding: 15px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.bridge-fields code {
  color: var(--ink);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 16px;
}

.token-message-bridge article > p {
  margin: 17px 0 0;
  color: var(--ink-soft);
  font-size: 18px;
  line-height: 1.4;
}

.bridge-conversion {
  display: flex;
  min-height: 305px;
  flex-direction: column;
  justify-content: center;
  padding: 0 34px;
  border-right: 1px solid var(--line);
  border-left: 1px solid var(--line);
  text-align: center;
}

.bridge-conversion strong {
  margin-bottom: 16px;
  font-size: 23px;
}

.bridge-conversion span {
  padding: 7px 0;
  color: var(--ink-soft);
  border-top: 1px solid var(--line);
  font-size: 16px;
}

.bridge-conversion span:last-child {
  border-bottom: 1px solid var(--line);
}

.timeline {
  position: relative;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 34px;
  margin-top: 66px;
}

.timeline::before {
  content: "";
  position: absolute;
  top: 39px;
  left: 24px;
  right: 24px;
  height: 1px;
  background: linear-gradient(90deg, var(--lime), var(--cyan), var(--violet), var(--coral));
}

.timeline-item {
  position: relative;
  padding-top: 74px;
}

.timeline-index {
  position: absolute;
  top: 20px;
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  color: var(--night);
  border-radius: 50%;
  background: var(--ink);
  font-size: 15px;
  font-weight: 800;
}

.timeline-item:nth-child(1) .timeline-index { background: var(--lime); }
.timeline-item:nth-child(2) .timeline-index { background: var(--cyan); }
.timeline-item:nth-child(3) .timeline-index { background: var(--violet); }
.timeline-item:nth-child(4) .timeline-index { background: var(--coral); }

.timeline-item p {
  min-height: 154px;
  margin-bottom: 16px;
  color: var(--ink-soft);
  font-size: 22px;
  line-height: 1.42;
}

.timeline-item small {
  color: var(--ink);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.emergence-grid {
  display: grid;
  grid-template-columns: 0.72fr 1.55fr;
  margin-top: 48px;
  border-top: 2px solid var(--ink);
  border-bottom: 1px solid var(--line);
}

.emergence-origin,
.oss-cluster {
  min-height: 338px;
  padding-top: 35px;
  padding-bottom: 34px;
}

.emergence-origin {
  padding-right: 48px;
  border-right: 1px solid var(--line);
}

.oss-cluster { padding-left: 48px; }

.emergence-label {
  margin: 0;
  color: var(--ink-soft);
  font-size: 16px;
  font-weight: 760;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.emergence-origin h3 {
  margin-top: 30px;
  font-size: 34px;
}

.emergence-origin p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 22px;
  line-height: 1.42;
}

.oss-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin-top: 30px;
}

.oss-grid article {
  min-height: 214px;
  padding-right: 32px;
}

.oss-grid article + article {
  padding-left: 32px;
  border-left: 1px solid var(--line);
}

.oss-grid h3 {
  min-height: 60px;
  margin-bottom: 18px;
  font-size: 25px;
}

.oss-grid p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 19px;
  line-height: 1.42;
}

.slide-claim {
  position: absolute;
  left: 92px;
  right: 92px;
  bottom: 66px;
  margin: 0;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  font-size: 28px;
  font-weight: 640;
  line-height: 1.25;
}

.slide-claim.dark { border-color: var(--line-dark); }

.agentic-rl-sequence {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin-top: 52px;
  border-top: 2px solid var(--line-dark);
  border-bottom: 1px solid var(--line-dark);
}

.agentic-rl-sequence article {
  min-height: 274px;
  padding: 28px 26px 24px;
}

.agentic-rl-sequence article + article {
  border-left: 1px solid var(--line-dark);
}

.agentic-rl-sequence article > span,
.agentic-rl-loss span {
  display: block;
  margin-bottom: 28px;
  color: var(--paper-soft);
  font-size: 16px;
  font-weight: 760;
  letter-spacing: 0.14em;
}

.agentic-rl-sequence h3 {
  max-width: 270px;
  margin-bottom: 18px;
  font-size: 31px;
}

.agentic-rl-sequence p {
  max-width: 286px;
  margin: 0;
  color: var(--paper-soft);
  font-size: 21px;
  line-height: 1.42;
}

.agentic-rl-loss {
  display: grid;
  grid-template-columns: 590px 1fr;
  align-items: center;
  min-height: 126px;
  padding: 22px 26px;
  border-bottom: 1px solid var(--line-dark);
}

.agentic-rl-loss span {
  margin: 0 0 10px;
}

.agentic-rl-loss code {
  display: block;
  color: var(--paper-ink);
  font-size: 28px;
  font-weight: 650;
  letter-spacing: 0;
}

.agentic-rl-loss p {
  margin: 0;
  color: var(--paper-soft);
  font-size: 20px;
  line-height: 1.42;
}

.agentic-rl-loss p strong {
  color: var(--paper-ink);
}

.render-flow {
  display: grid;
  grid-template-columns: 200px 54px 420px 54px 230px 54px 310px;
  align-items: center;
  margin-top: 62px;
  padding: 44px 0;
  border-top: 1px solid var(--line-dark);
  border-bottom: 1px solid var(--line-dark);
}

.flow-label span,
.flow-focus span {
  display: block;
  margin-top: 9px;
  color: var(--paper-soft);
  font-size: 18px;
  line-height: 1.3;
}

.flow-label strong,
.flow-focus strong {
  display: block;
  font-size: 23px;
  line-height: 1.25;
}

.flow-focus code {
  display: inline-block;
  margin-bottom: 18px;
  color: #394d00;
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 18px;
  font-weight: 720;
}

.flow-focus.secondary code { color: #9a3528; }

.flow-arrow {
  color: rgba(23, 26, 29, 0.42);
  font-size: 34px;
  text-align: center;
}

.flow-arrow.return { color: var(--coral); }

.split-argument {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 72px;
  margin-top: 44px;
}

.split-argument p {
  margin: 0;
  color: var(--paper-soft);
  font-size: 22px;
  line-height: 1.42;
}

.split-argument strong { color: var(--paper-ink); }

.text-boundary-compare {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  margin-top: 38px;
  border-top: 2px solid var(--paper-ink);
  border-bottom: 1px solid var(--line-dark);
}

.text-boundary-compare article {
  display: flex;
  min-height: 400px;
  flex-direction: column;
  padding: 28px 50px 24px 0;
}

.text-boundary-compare article + article {
  padding-left: 50px;
  border-left: 1px solid var(--line-dark);
}

.text-boundary-compare article > span {
  color: var(--paper-soft);
  font-size: 15px;
  font-weight: 760;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.text-boundary-compare h3 {
  margin-top: 20px;
  margin-bottom: 20px;
  font-size: 29px;
}

.text-boundary-compare article > p:not(.boundary-chain, .boundary-outcome) {
  margin: 0;
  color: var(--paper-soft);
  font-size: 19px;
  line-height: 1.42;
}

.boundary-chain {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 10px;
  align-items: center;
  min-height: 70px;
  margin: 0 0 20px;
  padding: 13px 0;
  border-top: 1px solid var(--line-dark);
  border-bottom: 1px solid var(--line-dark);
}

.boundary-chain code {
  color: var(--paper-ink);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 15px;
  font-weight: 680;
}

.boundary-chain i {
  color: var(--paper-soft);
  font-size: 18px;
  font-style: normal;
}

.boundary-outcome {
  margin: auto 0 0;
  padding-top: 17px;
  color: var(--paper-soft);
  border-top: 1px solid var(--line-dark);
  font-size: 18px;
  line-height: 1.38;
}

.boundary-outcome strong {
  color: var(--paper-ink);
  font-size: 19px;
}

/* Two prompt constructions: prioritize the equations and repair text. */
.prompt-constructions .text-boundary-compare {
  margin-top: 24px;
}

.prompt-constructions .text-boundary-compare article {
  min-height: 408px;
  padding: 18px 32px 16px 0;
}

.prompt-constructions .text-boundary-compare article + article {
  padding-left: 32px;
}

.prompt-constructions .text-boundary-compare h3 {
  margin-top: 14px;
  margin-bottom: 14px;
  font-size: 31px;
}

.prompt-constructions .boundary-chain {
  min-height: 58px;
  margin-bottom: 14px;
  padding: 8px 0;
}

.prompt-constructions .boundary-chain code {
  font-size: 23px;
  letter-spacing: -0.035em;
}

.prompt-constructions .text-boundary-compare article > p:not(.boundary-chain, .boundary-outcome) {
  font-size: 22px;
  line-height: 1.34;
}

.prompt-constructions .boundary-outcome {
  padding-top: 12px;
  font-size: 21px;
  line-height: 1.32;
}

.prompt-constructions .boundary-outcome strong {
  font-size: 22px;
}

.equation-block {
  margin-top: 58px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.equation-line {
  display: grid;
  grid-template-columns: 170px 115px 1fr 50px 115px 1.15fr;
  align-items: center;
  min-height: 146px;
  border-bottom: 1px solid var(--line);
}

.equation-line:last-child { border-bottom: 0; }

.equation-line.continuation { grid-template-columns: 170px 115px 1fr; }

.equation-name {
  color: var(--ink-soft);
  font-size: 16px;
  font-weight: 760;
  letter-spacing: 0.08em;
}

.equation-line code {
  color: var(--lime);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 44px;
  font-weight: 720;
}

.equation-line .action-code { color: var(--coral); }

.equation-line > span:not(.equation-name, .plus) {
  max-width: 380px;
  color: var(--ink-soft);
  font-size: 21px;
  line-height: 1.36;
}

.plus {
  color: var(--ink-soft);
  font-size: 32px;
}

.three-rules {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  margin-top: 46px;
}

.three-rules > div { padding-right: 46px; }

.three-rules > div + div {
  padding-left: 46px;
  border-left: 1px solid var(--line);
}

.three-rules b {
  color: var(--ink);
  font-size: 25px;
}

.three-rules p {
  margin: 10px 0 0;
  color: var(--ink-soft);
  font-size: 20px;
  line-height: 1.38;
}

.asymmetry {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  margin-top: 66px;
}

.asymmetry > div {
  min-height: 238px;
  padding-top: 30px;
  border-top: 6px solid var(--paper-ink);
}

.asymmetry-good { border-color: #6a9300 !important; }
.asymmetry-bad { border-color: var(--coral) !important; }

.direction {
  color: var(--paper-soft);
  font-size: 17px;
  font-weight: 760;
  letter-spacing: 0.08em;
}

.token-sample {
  display: flex;
  gap: 8px;
  margin: 23px 0 26px;
}

.token-sample span {
  padding: 8px 13px;
  border: 1px solid #6a9300;
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 18px;
}

.token-sample.muted span { border-color: rgba(23, 26, 29, 0.24); }

.asymmetry strong {
  display: block;
  font-size: 26px;
}

.asymmetry > div > p:last-child {
  max-width: 570px;
  margin: 10px 0 0;
  color: var(--paper-soft);
  font-size: 20px;
  line-height: 1.35;
}

.conditional {
  display: grid;
  grid-template-columns: 300px 1fr 1px 300px 1fr;
  gap: 28px;
  align-items: center;
  margin-top: 80px;
  padding-top: 28px;
  border-top: 1px solid var(--line-dark);
}

.conditional p {
  margin: 0;
  font-size: 20px;
  line-height: 1.35;
}

.conditional p:nth-child(2),
.conditional p:nth-child(5) { color: var(--paper-soft); }

.conditional-rule {
  height: 58px;
  background: var(--line-dark);
}

.continuity-checks {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  margin-top: 42px;
  border-top: 2px solid var(--ink);
  border-bottom: 1px solid var(--line);
}

.continuity-checks article {
  display: flex;
  min-height: 330px;
  flex-direction: column;
  padding: 28px 38px 25px 0;
}

.continuity-checks article + article {
  padding-right: 0;
  padding-left: 38px;
  border-left: 1px solid var(--line);
}

.continuity-checks article > span {
  color: var(--ink-soft);
  font-size: 15px;
  font-weight: 760;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.continuity-checks h3 {
  margin: 23px 0 19px;
  font-size: 31px;
}

.continuity-checks article > p:not(.continuity-equation) {
  margin: 0;
  color: var(--ink-soft);
  font-size: 19px;
  line-height: 1.42;
}

.continuity-equation {
  display: grid;
  grid-template-columns: 1fr 42px 1fr;
  align-items: center;
  margin: 0 0 22px;
  border: 1px solid var(--line);
}

.continuity-equation code {
  padding: 14px;
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 16px;
  text-align: center;
}

.continuity-equation i {
  display: grid;
  height: 100%;
  place-items: center;
  border-right: 1px solid var(--line);
  border-left: 1px solid var(--line);
  font-size: 21px;
  font-style: normal;
}

.continuity-checks article > strong {
  margin-top: auto;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  font-size: 19px;
}

.continuity-seam {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  margin-top: 25px;
  padding: 17px 20px;
  border: 1px solid var(--line);
  font-size: 17px;
}

.continuity-seam code {
  font-family: "SFMono-Regular", Consolas, monospace;
  font-weight: 760;
}

.continuity-seam span { color: var(--ink-soft); }

.continuity-seam + .slide-claim {
  margin-top: 24px;
  font-size: 24px;
}

.fw-pipeline {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0;
  margin-top: 58px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.fw-pipeline article {
  min-height: 318px;
  padding: 30px 30px 28px 0;
}

.fw-pipeline article + article {
  padding-left: 30px;
  border-left: 1px solid var(--line);
}

.fw-pipeline article > span {
  color: var(--lime);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 16px;
}

.fw-pipeline h3 { margin-top: 34px; }

.fw-pipeline p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 20px;
  line-height: 1.4;
}

.fw-pipeline code {
  color: var(--cyan);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 0.86em;
}

.fw-contract {
  display: grid;
  grid-template-columns: 210px 1fr;
  gap: 36px;
  align-items: baseline;
  margin-top: 42px;
}

.fw-contract span {
  color: var(--ink-soft);
  font-size: 17px;
  font-weight: 760;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.fw-contract strong { font-size: 25px; }

.affinity-flow {
  display: grid;
  grid-template-columns: 280px 54px 1fr 54px 280px;
  align-items: center;
  min-height: 158px;
  margin-top: 50px;
  border-top: 2px solid var(--paper-ink);
  border-bottom: 1px solid var(--line-dark);
}

.affinity-key span,
.affinity-target span {
  display: block;
  margin-bottom: 10px;
  color: var(--paper-soft);
  font-size: 16px;
  font-weight: 760;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.affinity-key strong,
.affinity-target strong {
  display: block;
  font-size: 24px;
  line-height: 1.25;
}

.affinity-arrow {
  color: var(--paper-soft);
  font-size: 32px;
  text-align: center;
}

.affinity-turns {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border: 1px solid var(--paper-ink);
}

.affinity-turns span {
  min-height: 64px;
  display: grid;
  place-items: center;
  color: var(--paper-soft);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 15px;
}

.affinity-turns span + span { border-left: 1px solid var(--line-dark); }

.affinity-rules {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin-top: 34px;
}

.affinity-rules p {
  margin: 0;
  padding-right: 40px;
  color: var(--paper-soft);
  font-size: 19px;
  line-height: 1.4;
}

.affinity-rules p + p {
  padding-left: 40px;
  border-left: 1px solid var(--line-dark);
}

.affinity-rules strong {
  color: var(--paper-ink);
  font-size: 22px;
}

.routing-evidence {
  display: grid;
  grid-template-columns: 190px 1fr;
  gap: 34px;
  align-items: baseline;
  margin-top: 38px;
  padding-top: 23px;
  border-top: 1px solid var(--line-dark);
}

.routing-evidence span,
.sandbox-benchmark span {
  color: var(--paper-soft);
  font-size: 16px;
  font-weight: 760;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.routing-evidence strong { font-size: 22px; }

.sandbox-compare {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  margin-top: 42px;
  border-top: 2px solid var(--ink);
  border-bottom: 1px solid var(--line);
}

.sandbox-compare article {
  min-height: 300px;
  padding: 32px 52px 30px 0;
}

.sandbox-compare article + article {
  padding-left: 52px;
  border-left: 1px solid var(--line);
}

.sandbox-compare article > span,
.rollout-contract article > span {
  color: var(--ink-soft);
  font-size: 16px;
  font-weight: 760;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.sandbox-compare h3 {
  margin-top: 24px;
  font-size: 30px;
}

.sandbox-compare ul {
  margin: 23px 0 0;
  padding-left: 22px;
  color: var(--ink-soft);
}

.sandbox-compare li {
  margin: 11px 0;
  padding-left: 5px;
  font-size: 20px;
  line-height: 1.35;
}

.sandbox-benchmark {
  display: grid;
  grid-template-columns: 190px 1fr;
  gap: 34px;
  align-items: baseline;
  margin-top: 32px;
}

.sandbox-benchmark strong {
  font-size: 21px;
  line-height: 1.4;
}

.gateway-placement {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin-top: 38px;
  border-top: 2px solid var(--ink);
  border-bottom: 1px solid var(--line);
}

.gateway-placement article {
  display: flex;
  min-height: 338px;
  flex-direction: column;
  padding: 31px 40px 27px 0;
}

.gateway-placement article + article {
  padding-left: 40px;
  border-left: 1px solid var(--line);
}

.gateway-placement article > span {
  color: var(--ink-soft);
  font-size: 15px;
  font-weight: 760;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.gateway-placement h3 {
  margin-top: 25px;
  font-size: 29px;
}

.gateway-placement p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 20px;
  line-height: 1.42;
}

.gateway-placement article > strong {
  margin-top: auto;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  font-size: 18px;
}

.architecture-compare {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 44px;
  margin-top: 38px;
}

.architecture-slide {
  padding-top: 52px;
  padding-bottom: 52px;
}

.architecture-panel {
  padding-top: 17px;
  border-top: 1px solid var(--line-dark);
}

.architecture-heading {
  display: block;
}

.architecture-heading h3 {
  margin: 0;
  font-size: 28px;
}

.architecture-panel figure {
  height: 460px;
  margin: 15px 0 18px;
  overflow: hidden;
  border: 1px solid var(--line);
  background: #fff;
}

.architecture-panel img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.architecture-panel > p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 19px;
  line-height: 1.35;
}

.architecture-panel code {
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 0.88em;
}

.architecture-credit {
  display: block;
  margin-top: 8px;
  color: var(--paper-soft);
  font-size: 13px;
  line-height: 1.25;
}

.placement-decision article { min-height: 326px; }

.placement-decision h3 { max-width: 360px; }

.placement-decision + .slide-claim {
  margin-top: 30px;
  font-size: 25px;
}

.decoupled-architecture {
  margin-top: 34px;
  border-top: 2px solid var(--paper-ink);
}

.decoupled-rail {
  display: grid;
  grid-template-columns: 124px minmax(0, 1fr) 74px 390px;
  min-height: 190px;
  border-bottom: 1px solid var(--line-dark);
}

.rail-name {
  align-self: center;
  color: var(--paper-soft);
  font-size: 16px;
  font-weight: 760;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.rollout-function-boundary,
.http-service-boundary {
  padding: 27px 34px;
  border-left: 1px solid var(--line-dark);
}

.rollout-function-boundary > span,
.http-service-boundary > span {
  color: var(--paper-soft);
  font-size: 15px;
  font-weight: 760;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.rollout-function-boundary h3,
.http-service-boundary h3 {
  margin: 20px 0 10px;
  font-size: 28px;
}

.rollout-function-boundary h3 code {
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 0.82em;
}

.rollout-function-boundary p,
.http-service-boundary p {
  margin: 0;
  color: var(--paper-soft);
  font-size: 19px;
  line-height: 1.38;
}

.rollout-function-boundary p code,
.http-service-boundary p code {
  color: var(--paper-ink);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 0.86em;
}

.rail-arrow {
  display: grid;
  place-items: center;
  color: var(--paper-soft);
  border-left: 1px solid var(--line-dark);
  font-size: 32px;
  font-style: normal;
}

.http-service-boundary {
  border-right: 1px solid var(--line-dark);
}

.decoupled-architecture + .slide-claim {
  font-size: 25px;
}

.rollout-contract {
  display: grid;
  grid-template-columns: 1fr 78px 1fr;
  align-items: stretch;
  margin-top: 46px;
  border-top: 2px solid var(--paper-ink);
  border-bottom: 1px solid var(--line-dark);
}

.rollout-contract article {
  min-height: 254px;
  padding: 31px 34px 28px 0;
}

.rollout-contract article:last-child { padding-left: 34px; }

.rollout-contract h3 {
  margin-top: 25px;
  font-size: 29px;
}

.rollout-contract h3 code {
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 0.77em;
}

.rollout-contract article p {
  max-width: 570px;
  margin: 0;
  color: var(--paper-soft);
  font-size: 20px;
  line-height: 1.4;
}

.rollout-contract-arrow {
  display: grid;
  place-items: center;
  color: var(--paper-soft);
  border-right: 1px solid var(--line-dark);
  border-left: 1px solid var(--line-dark);
  font-size: 34px;
}

.decoupled-stack {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin-top: 34px;
}

.decoupled-stack p {
  margin: 0;
  padding-right: 34px;
}

.decoupled-stack p + p {
  padding-left: 34px;
  border-left: 1px solid var(--line-dark);
}

.decoupled-stack span {
  display: block;
  margin-bottom: 9px;
  color: var(--paper-soft);
  font-size: 15px;
  font-weight: 760;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.decoupled-stack strong {
  display: block;
  font-size: 19px;
  line-height: 1.35;
}

.boundary-table {
  margin-top: 42px;
  border-top: 2px solid var(--paper-ink);
  border-bottom: 2px solid var(--paper-ink);
}

.boundary-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-bottom: 1px solid var(--line-dark);
}

.boundary-row:last-child { border-bottom: 0; }

.boundary-row > div {
  min-height: 130px;
  padding: 23px 34px 20px 0;
  color: var(--paper-soft);
  font-size: 18px;
  line-height: 1.34;
}

.boundary-row > div + div {
  padding-left: 34px;
  border-left: 1px solid var(--line-dark);
}

.boundary-row strong {
  color: var(--paper-ink);
  font-size: 20px;
}

.boundary-head > div {
  min-height: auto;
  padding-top: 16px;
  padding-bottom: 16px;
  color: var(--paper-ink);
  font-size: 18px;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.boundary-head > div:nth-child(1) { color: #b94333; }
.boundary-head > div:nth-child(2) { color: #745cc5; }
.boundary-head > div:nth-child(3) { color: #567200; }

.boundary-row code {
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 0.9em;
}

.boundary-rule {
  margin: 32px 0 0;
  font-size: 22px;
  line-height: 1.4;
}

.placement-tradeoff {
  margin-top: 30px;
}

.placement-tradeoff .boundary-row {
  grid-template-columns: 0.68fr 1.16fr 1.16fr;
}

.placement-tradeoff .boundary-row > div {
  min-height: 82px;
  padding-top: 15px;
  padding-bottom: 14px;
  font-size: 17px;
}

.placement-tradeoff .boundary-head > div {
  min-height: auto;
  padding-top: 13px;
  padding-bottom: 13px;
  font-size: 15px;
}

.placement-tradeoff .boundary-row strong {
  font-size: 18px;
}

.metrics-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin-top: 48px;
  border-top: 2px solid var(--paper-ink);
  border-bottom: 1px solid var(--line-dark);
}

.metrics-strip article {
  min-height: 226px;
  padding: 30px 40px 28px 0;
}

.metrics-strip article + article {
  padding-left: 40px;
  border-left: 1px solid var(--line-dark);
}

.metrics-strip article > strong {
  display: block;
  margin-bottom: 25px;
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 47px;
  letter-spacing: -0.05em;
}

.metrics-strip h3 {
  margin-bottom: 9px;
  font-size: 25px;
}

.metrics-strip p {
  max-width: 370px;
  margin: 0;
  color: var(--paper-soft);
  font-size: 19px;
  line-height: 1.38;
}

.drift-breakdown {
  display: grid;
  grid-template-columns: 1.65fr 0.8fr;
  gap: 72px;
  margin-top: 35px;
}

.drift-label {
  margin: 0 0 13px;
  color: var(--paper-soft);
  font-size: 16px;
  font-weight: 760;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.drift-breakdown ol {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0 44px;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line-dark);
  list-style: none;
}

.drift-breakdown li {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  padding: 15px 0;
  border-bottom: 1px solid var(--line-dark);
  color: var(--paper-soft);
  font-size: 18px;
}

.drift-breakdown li strong { color: var(--paper-ink); }

.metrics-cut {
  margin: 29px 0 0;
  padding-left: 32px;
  border-left: 2px solid var(--paper-ink);
  color: var(--paper-soft);
  font-size: 18px;
  line-height: 1.5;
}

.metrics-cut strong {
  color: var(--paper-ink);
  font-size: 20px;
}

.slide-recap {
  background:
    radial-gradient(circle at 80% 75%, rgba(184, 240, 58, 0.1), transparent 31%),
    var(--night);
}

.recap-list {
  width: 1050px;
  margin: 64px 0 0;
  padding: 0;
  list-style: none;
}

.recap-list li {
  display: grid;
  grid-template-columns: 76px 1fr;
  gap: 22px;
  align-items: start;
  padding: 24px 0;
  border-top: 1px solid var(--line);
}

.recap-list li:last-child { border-bottom: 1px solid var(--line); }

.recap-list span {
  color: var(--lime);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 18px;
  font-weight: 760;
}

.recap-list p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 22px;
  line-height: 1.38;
}

.recap-list strong {
  color: var(--ink);
  font-size: 27px;
}

.recap-references {
  position: absolute;
  left: 92px;
  bottom: 72px;
  width: 820px;
  margin: 0;
  padding-top: 15px;
  color: var(--ink-soft);
  border-top: 1px solid var(--line);
  font-size: 17px;
  line-height: 1.5;
}

.recap-references strong {
  color: var(--ink);
  font-size: 16px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.recap-references a {
  color: inherit;
  text-decoration-color: var(--line);
  text-underline-offset: 3px;
}

.final-line {
  position: absolute;
  right: 92px;
  bottom: 72px;
  width: 480px;
  margin: 0;
  color: var(--ink);
  font-size: 31px;
  font-weight: 680;
  line-height: 1.25;
  text-align: right;
}

.final-line span { color: var(--coral); }

.chrome {
  position: fixed;
  right: 22px;
  top: 20px;
  z-index: 20;
  display: flex;
  gap: 8px;
  align-items: center;
  padding: 7px;
  color: var(--ink);
  border: 1px solid rgba(245, 241, 232, 0.16);
  background: rgba(8, 10, 12, 0.78);
  backdrop-filter: blur(12px);
}

.chrome button {
  height: 36px;
  padding: 0 12px;
  color: var(--ink);
  border: 0;
  background: transparent;
  cursor: pointer;
}

.chrome button:hover,
.chrome button:focus-visible {
  color: var(--night);
  outline: 0;
  background: var(--lime);
}

.counter {
  min-width: 76px;
  font-size: 15px;
  text-align: center;
}

.counter i {
  margin: 0 7px;
  color: rgba(245, 241, 232, 0.38);
  font-style: normal;
}

.progress {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 22;
  height: 3px;
  background: rgba(245, 241, 232, 0.08);
}

.progress span {
  display: block;
  width: 5.8824%;
  height: 100%;
  background: var(--lime);
  transition: width 180ms ease-out;
}

.brand-lower { text-transform: lowercase; }

@media (max-width: 760px) {
  .chrome { top: 10px; right: 8px; }
}

@media print {
  @page { size: 1600px 900px; margin: 0; }

  html,
  body {
    width: auto;
    height: auto;
    overflow: visible;
    background: #fff;
  }

  .viewport { position: static; display: block; }

  .deck {
    position: relative;
    top: auto;
    left: auto;
    width: var(--slide-width);
    height: auto;
    transform: none;
    box-shadow: none;
  }

  .slide,
  .slide.is-active {
    position: relative;
    display: block;
    width: var(--slide-width);
    height: var(--slide-height);
    break-after: page;
    animation: none;
  }

  .chrome,
  .progress { display: none; }

  .pdf-export .architecture-credit,
  .pdf-export .recap-references { display: none; }
}

/*
 * Provisional monochrome theme.
 *
 * Keep the structural rules above intact so layout, hierarchy, notes, print
 * behavior, and future design hooks remain available. This final override is
 * intentionally easy to remove when the dedicated styling pass begins.
 */
:root {
  color-scheme: light;
  --ink: #111;
  --ink-soft: #555;
  --paper: #fff;
  --paper-ink: #111;
  --paper-soft: #555;
  --night: #fff;
  --night-2: #fff;
  --line: rgba(17, 17, 17, 0.22);
  --line-dark: rgba(17, 17, 17, 0.22);
  --lime: #111;
  --coral: #111;
  --cyan: #111;
  --violet: #111;
}

html,
body { background: #fff; }

.deck {
  background: #fff;
  box-shadow: none;
}

.slide,
.slide-light,
.slide-recap {
  color: #111;
  background: #fff;
}

.ambient { display: none; }

.slide-light .eyebrow,
.flow-focus code,
.flow-focus.secondary code,
.boundary-head > div:nth-child(1),
.boundary-head > div:nth-child(2),
.boundary-head > div:nth-child(3) { color: #111; }

.timeline::before { background: #111; }

.timeline-item:nth-child(1) .timeline-index,
.timeline-item:nth-child(2) .timeline-index,
.timeline-item:nth-child(3) .timeline-index,
.timeline-item:nth-child(4) .timeline-index {
  color: #fff;
  background: #111;
}

.token-river span {
  color: #666;
  border-color: #bbb;
}

.token-river .action {
  color: #fff;
  border-color: #111;
  background: #111;
}

.asymmetry-good,
.asymmetry-bad { border-color: #111 !important; }

.token-sample span { border-color: #111; }

.token-sample span.token-mismatch {
  border-color: #168346 !important;
  box-shadow: inset 0 0 0 2px #168346;
  font-weight: 760;
}

.chrome {
  color: #111;
  border-color: #111;
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: none;
}

.chrome button { color: #111; }

.chrome button:hover,
.chrome button:focus-visible {
  color: #fff;
  background: #111;
}

.counter i { color: #777; }

.progress { background: #ddd; }
.progress span { background: #111; }

/* Personal-site integration: retain the slide layout while sharing the blog theme. */
:root,
[data-theme="dark"] {
  color-scheme: dark;
  --site-bg: #161310;
  --site-ink: #f4efe5;
  --site-dim: #bdb3a4;
  --site-faint: #746a5f;
  --site-rule: #3a332c;
  --site-accent: #6aa0ff;
  --site-accent-soft: #2b3a5c;
  --ink: var(--site-ink);
  --ink-soft: var(--site-dim);
  --paper: var(--site-bg);
  --paper-ink: var(--site-ink);
  --paper-soft: var(--site-dim);
  --night: var(--site-bg);
  --night-2: var(--site-bg);
  --line: var(--site-rule);
  --line-dark: var(--site-rule);
  --lime: var(--site-accent);
  --coral: var(--site-accent);
  --cyan: var(--site-accent);
  --violet: var(--site-accent);
}

[data-theme="light"] {
  color-scheme: light;
  --site-bg: #f7f0e4;
  --site-ink: #1f1a15;
  --site-dim: #675f55;
  --site-faint: #9d9284;
  --site-rule: #d8ccba;
  --site-accent: #2a62d0;
  --site-accent-soft: #b7c9e8;
  --ink: var(--site-ink);
  --ink-soft: var(--site-dim);
  --paper: var(--site-bg);
  --paper-ink: var(--site-ink);
  --paper-soft: var(--site-dim);
  --night: var(--site-bg);
  --night-2: var(--site-bg);
  --line: var(--site-rule);
  --line-dark: var(--site-rule);
  --lime: var(--site-accent);
  --coral: var(--site-accent);
  --cyan: var(--site-accent);
  --violet: var(--site-accent);
}

html,
body {
  background: var(--site-bg);
}

body,
button {
  font-family: "Source Serif 4", Georgia, "Times New Roman", serif;
}

.deck {
  background: var(--site-bg);
  box-shadow: none;
}

.slide,
.slide-light,
.slide-recap {
  color: var(--site-ink);
  background: var(--site-bg);
}

.slide-light .eyebrow,
.flow-focus code,
.flow-focus.secondary code,
.boundary-head > div:nth-child(1),
.boundary-head > div:nth-child(2),
.boundary-head > div:nth-child(3) {
  color: var(--site-accent);
}

.timeline::before,
.timeline-item:nth-child(1) .timeline-index,
.timeline-item:nth-child(2) .timeline-index,
.timeline-item:nth-child(3) .timeline-index,
.timeline-item:nth-child(4) .timeline-index,
.token-river .action,
.progress span {
  background: var(--site-accent);
}

.timeline-item:nth-child(1) .timeline-index,
.timeline-item:nth-child(2) .timeline-index,
.timeline-item:nth-child(3) .timeline-index,
.timeline-item:nth-child(4) .timeline-index,
.token-river .action {
  color: var(--site-bg);
}

.token-river span,
.token-sample span,
.token-sample span.token-mismatch,
.asymmetry-good,
.asymmetry-bad {
  border-color: var(--site-accent) !important;
}

.token-sample span.token-mismatch {
  box-shadow: inset 0 0 0 2px var(--site-accent);
}

.site-nav {
  position: fixed;
  top: 20px;
  left: 24px;
  z-index: 25;
  display: flex;
  align-items: center;
  gap: 20px;
  color: var(--site-dim);
  font-size: 14px;
}

.site-nav a {
  color: var(--site-dim);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.site-nav a:hover {
  color: var(--site-accent);
  border-color: var(--site-accent-soft);
}

.theme-toggle {
  appearance: none;
  padding: 0;
  color: var(--site-dim);
  border: 0;
  border-bottom: 1px solid var(--site-accent-soft);
  background: transparent;
  cursor: pointer;
  font-size: 14px;
}

.theme-toggle:hover,
.theme-toggle:focus-visible {
  color: var(--site-accent);
  border-color: var(--site-accent);
}

.chrome {
  color: var(--site-ink);
  border-color: var(--site-rule);
  background: color-mix(in srgb, var(--site-bg) 94%, transparent);
}

.chrome button {
  color: var(--site-ink);
}

.chrome button:hover,
.chrome button:focus-visible {
  color: var(--site-bg);
  background: var(--site-accent);
}

.counter i {
  color: var(--site-faint);
}

.progress {
  background: var(--site-rule);
}

@media (max-width: 760px) {
  .site-nav {
    top: 10px;
    left: 12px;
  }
}