:root {
  --ink: #101829;
  --ink-soft: #253049;
  --paper: #f4f1e9;
  --paper-deep: #e8e2d7;
  --white: #fffdf7;
  --coral: #ff7058;
  --aqua: #55d9c6;
  --violet: #ac9cff;
  --muted: #596174;
  --line: rgba(16, 24, 41, 0.18);
  --dark-line: #39455e;
  --radius: 0.55rem;
  --serif: Georgia, "Times New Roman", serif;
  --sans: "Avenir Next", Avenir, "Segoe UI", Helvetica, Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 96px;
}

body {
  margin: 0;
  overflow-x: hidden;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  text-rendering: optimizeLegibility;
}

a {
  color: inherit;
  text-decoration: none;
}
button,
textarea {
  font: inherit;
}
button {
  color: inherit;
}
img {
  max-width: 100%;
}
::selection {
  background: var(--aqua);
  color: var(--ink);
}

:focus-visible {
  outline: 3px solid var(--coral);
  outline-offset: 4px;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 12px;
  left: 12px;
  padding: 0.6rem 0.8rem;
  background: var(--ink);
  color: var(--white);
  transform: translateY(-150%);
  transition: transform 0.2s ease;
}

.skip-link:focus {
  transform: translateY(0);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.section-shell {
  width: min(1180px, calc(100% - 48px));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  z-index: 20;
  top: 0;
  width: 100%;
  min-height: 76px;
  padding-inline: max(24px, calc((100% - 1280px) / 2));
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  background: rgba(244, 241, 233, 0.93);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(14px);
}

.wordmark {
  width: max-content;
  font-family: var(--serif);
  font-size: 1.45rem;
  font-weight: 700;
  letter-spacing: -0.04em;
}

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

.site-header nav {
  display: flex;
  gap: clamp(1.1rem, 2.4vw, 2rem);
  font-size: 0.78rem;
  font-weight: 750;
  letter-spacing: 0.04em;
}

.site-header nav a,
.nav-cv,
footer a {
  transition: opacity 0.2s ease;
}

.site-header nav a:hover,
.nav-cv:hover,
footer a:hover {
  opacity: 0.56;
}

.nav-cv {
  justify-self: end;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.82rem;
  font-weight: 800;
}

.hero {
  position: relative;
  min-height: calc(100vh - 76px);
  padding: clamp(64px, 8vw, 112px) 0 94px;
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(460px, 1.08fr);
  gap: clamp(3.5rem, 7vw, 6.7rem);
  align-items: center;
}

.hero::before,
.hero::after {
  content: "";
  position: absolute;
  pointer-events: none;
}

.hero::before {
  z-index: -1;
  width: 430px;
  height: 430px;
  left: -290px;
  top: 70px;
  border: 1px solid rgba(16, 24, 41, 0.09);
  border-radius: 50%;
}

.hero::after {
  z-index: -1;
  right: -160px;
  bottom: 38px;
  width: 320px;
  height: 130px;
  background-image: radial-gradient(
    rgba(16, 24, 41, 0.14) 1px,
    transparent 1px
  );
  background-size: 13px 13px;
  opacity: 0.5;
}

.availability,
.section-index,
.eyebrow {
  font-size: 0.71rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  font-weight: 800;
}

.availability {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  margin: 0;
}

.availability span {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--coral);
  box-shadow: 0 0 0 5px rgba(255, 112, 88, 0.13);
}

.hero h1 {
  margin: 1.45rem 0 1.45rem;
  font-family: var(--serif);
  font-size: clamp(5rem, 9vw, 8.1rem);
  font-weight: 500;
  line-height: 0.76;
  letter-spacing: -0.078em;
}

.hero-role {
  max-width: 690px;
  margin: 0;
  font-size: clamp(1.48rem, 2.7vw, 2.35rem);
  font-weight: 680;
  line-height: 1.13;
  letter-spacing: -0.043em;
}

.hero-role em {
  color: var(--coral);
  font-family: var(--serif);
  font-weight: 500;
}

.hero-summary {
  max-width: 610px;
  margin: 1.55rem 0 0;
  color: #485168;
  font-size: 1rem;
}

.hero-actions,
.contact-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.9rem;
}

.button-primary,
.button-secondary {
  min-height: 49px;
  padding: 0.72rem 1.15rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  border: 1px solid var(--ink);
  font-size: 0.82rem;
  font-weight: 800;
  transition:
    transform 0.2s ease,
    box-shadow 0.2s ease;
}

.button-primary {
  background: var(--ink);
  color: var(--white);
}
.button-secondary {
  background: transparent;
}

.button-primary:hover,
.button-secondary:hover {
  transform: translate(-2px, -2px);
  box-shadow: 4px 4px 0 var(--coral);
}

.role-note {
  max-width: 540px;
  margin: 1.1rem 0 0;
  color: #6a7180;
  font-size: 0.76rem;
}

.hero-demo {
  min-width: 0;
}

.demo-card {
  position: relative;
  overflow: hidden;
  padding: clamp(1.2rem, 3vw, 1.7rem);
  background: var(--ink);
  color: var(--white);
  border-radius: 11px;
  box-shadow: 16px 18px 0 rgba(255, 112, 88, 0.25);
}

.demo-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto auto;
  width: 240px;
  height: 240px;
  background: radial-gradient(
    circle at 100% 0%,
    rgba(85, 217, 198, 0.2),
    transparent 66%
  );
  pointer-events: none;
}

.demo-topline {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  color: #aeb8cf;
  font-size: 0.64rem;
  letter-spacing: 0.11em;
  font-weight: 800;
}

.demo-topline > div {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.live-dot {
  width: 7px;
  height: 7px;
  display: inline-block;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--aqua);
  box-shadow: 0 0 0 4px rgba(85, 217, 198, 0.12);
}

.demo-card h2 {
  max-width: 470px;
  margin: 1.25rem 0 0.35rem;
  font-family: var(--serif);
  font-size: clamp(1.65rem, 3vw, 2.15rem);
  font-weight: 500;
  line-height: 1.08;
  letter-spacing: -0.04em;
}

.demo-intro {
  max-width: 490px;
  margin: 0 0 1.15rem;
  color: #aeb8cf;
  font-size: 0.8rem;
}

.example-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 0.55rem;
}

.example-tabs button {
  border: 1px solid #3b4761;
  background: transparent;
  color: #b7c0d2;
  border-radius: 99px;
  padding: 0.28rem 0.68rem;
  font-size: 0.67rem;
  cursor: pointer;
}

.example-tabs button:hover {
  border-color: var(--aqua);
}

.example-tabs button.active {
  background: var(--aqua);
  border-color: var(--aqua);
  color: var(--ink);
  font-weight: 800;
}

.demo-card textarea {
  display: block;
  width: 100%;
  min-height: 118px;
  resize: vertical;
  border: 1px solid #3b4761;
  border-radius: 4px;
  outline: none;
  background: #172238;
  color: var(--white);
  padding: 0.85rem;
  font-size: 0.84rem;
  line-height: 1.52;
  transition: border-color 0.2s ease;
}

.demo-card textarea:focus {
  border-color: var(--aqua);
}

.analyze-button {
  width: 100%;
  margin-top: 0.55rem;
  padding: 0.72rem 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  border: 0;
  background: var(--coral);
  color: var(--ink);
  font-weight: 850;
  cursor: pointer;
  transition: background 0.2s ease;
}

.analyze-button:hover {
  background: #ff8a76;
}
.analyze-button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.result-panel {
  margin-top: 1.05rem;
  padding-top: 0.95rem;
  border-top: 1px solid #34415b;
}
.score-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.score-head > div {
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
}
.score-head span {
  color: #aeb8cf;
  font-size: 0.71rem;
}
.score-head strong {
  font-family: var(--serif);
  font-size: 1.85rem;
  font-weight: 500;
}

.classification {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.24rem 0.5rem;
  border: 1px solid #45516a;
  border-radius: 99px;
}

.classification.positive {
  color: var(--aqua);
}
.classification.negative {
  color: #ff947f;
}
.classification.neutral {
  color: #d1c8ff;
}

.tone-track {
  position: relative;
  height: 5px;
  margin: 0.58rem 0 0.2rem;
  background: linear-gradient(90deg, var(--coral), #6f7890 50%, var(--aqua));
  border-radius: 99px;
}

.tone-track i {
  position: absolute;
  top: 50%;
  width: 13px;
  height: 13px;
  background: var(--white);
  border: 3px solid var(--ink);
  border-radius: 50%;
  transform: translate(-50%, -50%);
}

.tone-labels {
  display: flex;
  justify-content: space-between;
  color: #8390a9;
  font-size: 0.57rem;
}

.probabilities {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.7rem;
  margin-top: 0.8rem;
}

.probabilities div {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.33rem;
  color: #aeb8cf;
  font-size: 0.64rem;
}

.probabilities b {
  color: var(--white);
}
.probabilities i {
  grid-column: 1 / -1;
  height: 3px;
  overflow: hidden;
  background: #34415b;
}
.probabilities em {
  display: block;
  height: 100%;
  background: var(--aqua);
  transition: width 0.25s ease;
}
.demo-footnote {
  margin: 0.7rem 0 0;
  color: #7d89a0;
  font-size: 0.59rem;
}

.demo-notice {
  margin-top: 0.9rem;
  padding: 0.72rem;
  border: 1px solid rgba(85, 217, 198, 0.45);
  background: rgba(85, 217, 198, 0.08);
  color: #c9d0df;
  font-size: 0.72rem;
}

.demo-notice.is-error {
  border-color: rgba(255, 112, 88, 0.55);
  background: rgba(255, 112, 88, 0.08);
}

.demo-notice strong {
  display: block;
  color: var(--white);
}

.demo-notice > span {
  display: block;
  margin-top: 0.15rem;
}

.demo-progress {
  display: block;
  height: 3px;
  margin-top: 0.6rem;
  overflow: hidden;
  background: #34415b;
}

.demo-progress[hidden] {
  display: none;
}

.demo-progress em {
  display: block;
  width: 0;
  height: 100%;
  background: var(--aqua);
  transition: width 0.2s ease;
}

.demo-link {
  width: max-content;
  margin: 1.2rem 0 0 auto;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  border-bottom: 1px solid var(--ink);
  font-size: 0.72rem;
  font-weight: 800;
}

.proof-bar {
  background: var(--coral);
  border-block: 1px solid var(--ink);
}

.proof-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}

.proof-grid div {
  min-height: 108px;
  padding: 1.15rem 1.4rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  border-right: 1px solid rgba(16, 24, 41, 0.35);
}

.proof-grid div:first-child {
  border-left: 1px solid rgba(16, 24, 41, 0.35);
}
.proof-grid strong {
  font-family: var(--serif);
  font-size: 1.22rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}
.proof-grid span {
  margin-top: 0.12rem;
  font-size: 0.69rem;
  font-weight: 720;
  letter-spacing: 0.035em;
}

.section-block {
  padding-block: 122px;
}

.section-heading {
  display: grid;
  grid-template-columns: 0.7fr 1.3fr 0.75fr;
  gap: clamp(2rem, 4vw, 3.4rem);
  align-items: start;
  margin-bottom: 4.3rem;
}

.section-index {
  margin: 0;
  color: #6b7180;
}

.section-heading h2,
.story-heading h2,
.contact h2 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(2.65rem, 5vw, 4.85rem);
  font-weight: 500;
  line-height: 0.99;
  letter-spacing: -0.057em;
}

.section-heading > p:last-child,
.story-heading > p {
  margin: 0.15rem 0 0;
  color: var(--muted);
}

.research-list {
  border-top: 1px solid var(--ink);
}

.research-card {
  position: relative;
  padding: 2.35rem 0;
  display: grid;
  grid-template-columns: 72px minmax(0, 1.04fr) minmax(300px, 0.96fr);
  gap: clamp(1.5rem, 4vw, 3rem);
  border-bottom: 1px solid var(--line);
}

.research-card::before {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 70px;
  height: 3px;
  transition: width 0.35s ease;
}

.research-card:hover::before {
  width: 100%;
}
.research-card.coral::before {
  background: var(--coral);
}
.research-card.aqua::before {
  background: var(--aqua);
}
.research-card.violet::before {
  background: var(--violet);
}
.paper-number {
  font-family: var(--serif);
  font-size: 1.05rem;
}

.paper-body > p:first-child,
.eyebrow {
  margin: 0 0 0.7rem;
  color: #6b7180;
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.paper-body h3 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(1.55rem, 2.3vw, 1.95rem);
  font-weight: 500;
  line-height: 1.12;
  letter-spacing: -0.032em;
}

.paper-authors {
  margin: 0.75rem 0 0;
  color: #555e71;
  font-size: 0.79rem;
  font-style: italic;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-top: 1.05rem;
}

.tags span {
  padding: 0.24rem 0.55rem;
  border: 1px solid var(--line);
  border-radius: 99px;
  font-size: 0.64rem;
  font-weight: 700;
}

.paper-summary > p {
  margin: 0;
  color: #50596d;
  font-size: 0.88rem;
}

.paper-result {
  margin-top: 1.1rem;
  padding: 0.9rem 1rem;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.85rem;
  align-items: center;
  background: var(--paper-deep);
  border-left: 3px solid var(--coral);
}

.paper-result strong {
  font-family: var(--serif);
  font-size: 1.55rem;
  white-space: nowrap;
}
.paper-result span {
  color: #4f5768;
  font-size: 0.73rem;
  line-height: 1.42;
}

.paper-summary details {
  margin-top: 1rem;
  border-top: 1px solid var(--line);
}

.paper-summary summary {
  padding: 0.72rem 0;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  cursor: pointer;
  list-style: none;
}

.paper-summary summary::-webkit-details-marker {
  display: none;
}
.paper-summary summary span {
  color: var(--coral);
  font-size: 1rem;
  transition: transform 0.2s ease;
}
.paper-summary details[open] summary span {
  transform: rotate(45deg);
}
.paper-summary details p {
  margin: 0 0 0.75rem;
  color: #596174;
  font-size: 0.8rem;
}

.econbert-story {
  padding-block: 122px;
  background: var(--ink);
  color: var(--white);
}
.section-index.light {
  color: #a7b1c5;
}

.story-heading {
  display: grid;
  grid-template-columns: 1.35fr 0.65fr;
  gap: clamp(3rem, 7vw, 6rem);
  align-items: end;
}

.story-heading h2 {
  margin-top: 1.2rem;
}
.story-heading > p {
  color: #b5bed0;
}

.method-grid {
  margin-top: 4.5rem;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-block: 1px solid var(--dark-line);
}

.method-grid article {
  padding: 2rem 1.4rem 2rem 0;
  border-right: 1px solid var(--dark-line);
}
.method-grid article:not(:first-child) {
  padding-left: 1.4rem;
}
.method-grid article:last-child {
  border-right: 0;
}
.method-grid span {
  font-family: var(--serif);
  color: var(--coral);
}
.method-grid h3 {
  margin: 1.45rem 0 0.5rem;
  font-size: 0.95rem;
}
.method-grid p {
  margin: 0;
  color: #a7b1c5;
  font-size: 0.8rem;
}

.metric-strip {
  margin-top: 2rem;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  background: #172238;
}
.metric-strip div {
  padding: 1.25rem;
  border-right: 1px solid #34415b;
}
.metric-strip div:last-child {
  border-right: 0;
}
.metric-strip strong {
  display: block;
  color: var(--aqua);
  font-family: var(--serif);
  font-size: 1.65rem;
  font-weight: 500;
}
.metric-strip span {
  color: #9aa6bc;
  font-size: 0.7rem;
}

.research-figure {
  margin: 4rem 0 0;
}
.research-figure img {
  display: block;
  width: 100%;
  height: auto;
  background: white;
  border: 1px solid #3b4761;
}
.research-figure figcaption {
  max-width: 800px;
  margin-top: 0.9rem;
  color: #9aa6bc;
  font-size: 0.76rem;
}
.research-figure figcaption strong {
  color: var(--white);
}

.researcher-note {
  margin-top: 3.5rem;
  padding-top: 1.8rem;
  display: grid;
  grid-template-columns: 0.38fr 1fr;
  gap: 2rem;
  border-top: 1px solid var(--dark-line);
}

.researcher-note p {
  margin: 0;
  color: #909bb2;
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}
.researcher-note div {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
}
.researcher-note span {
  padding: 0.35rem 0.65rem;
  border: 1px solid #48546d;
  color: #c1c9d8;
  font-size: 0.7rem;
}

.section-heading.horizontal {
  grid-template-columns: 1.15fr 0.55fr;
  align-items: end;
}
.section-heading.horizontal > div h2 {
  margin-top: 1rem;
}

.experience-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.experience-feature,
.capability-stack article {
  background: var(--paper);
}
.experience-feature {
  padding: clamp(1.8rem, 4vw, 3rem);
}
.experience-feature .eyebrow {
  color: #6b7180;
}

.experience-feature h3 {
  max-width: 560px;
  margin: 1.1rem 0 2.5rem;
  font-family: var(--serif);
  font-size: clamp(2rem, 3.5vw, 3.35rem);
  font-weight: 500;
  line-height: 1;
  letter-spacing: -0.045em;
}

.experience-feature ul {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}
.experience-feature li {
  position: relative;
  padding: 0.88rem 0 0.88rem 1.3rem;
  border-bottom: 1px solid var(--line);
  color: #4f586b;
  font-size: 0.84rem;
}
.experience-feature li::before {
  content: "↗";
  position: absolute;
  left: 0;
  color: var(--coral);
  font-weight: 800;
}

.capability-stack {
  display: grid;
  gap: 1px;
  background: var(--line);
}
.capability-stack article {
  padding: 1.25rem 1.45rem;
  display: grid;
  gap: 0.35rem;
}
.capability-stack span {
  color: #6b7180;
  font-size: 0.65rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.capability-stack strong {
  font-family: var(--serif);
  font-size: 1.03rem;
  font-weight: 500;
  line-height: 1.42;
}

.signal-grid {
  margin-top: 1.2rem;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.signal-grid article {
  min-height: 190px;
  padding: 1.6rem;
  background: var(--paper);
}
.signal-grid b {
  font-family: var(--serif);
  font-size: 1.2rem;
  font-weight: 600;
}
.signal-grid p {
  margin: 1.8rem 0 0;
  color: #586174;
  font-size: 0.8rem;
}

.credentials {
  padding-block: 100px;
  background: #243049;
  color: var(--white);
}
.credential-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(3rem, 8vw, 7rem);
}
.credential-icon {
  display: block;
  margin-bottom: 1.5rem;
  color: var(--aqua);
  font-size: 1.4rem;
}

.credential-grid h2 {
  margin: 1rem 0 2rem;
  font-family: var(--serif);
  font-size: clamp(2rem, 3.4vw, 2.65rem);
  font-weight: 500;
  line-height: 1.07;
  letter-spacing: -0.038em;
}

.credential-grid ul {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid #48536a;
}
.credential-grid li {
  padding: 0.95rem 0;
  display: grid;
  gap: 0.14rem;
  border-bottom: 1px solid #48536a;
}
.credential-grid li strong {
  font-size: 0.84rem;
}
.credential-grid li span {
  color: #aeb8ca;
  font-size: 0.74rem;
}

.contact {
  padding-block: 120px;
}

.contact-card {
  position: relative;
  overflow: hidden;
  padding: clamp(2rem, 6vw, 5.3rem);
  background: var(--white);
  border: 1px solid var(--ink);
}

.contact-card::after {
  content: "KQ";
  position: absolute;
  right: -0.08em;
  bottom: -0.33em;
  color: rgba(16, 24, 41, 0.035);
  font-family: var(--serif);
  font-size: clamp(9rem, 24vw, 21rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.1em;
  pointer-events: none;
}

.contact h2 {
  position: relative;
  z-index: 1;
  max-width: 920px;
  margin-top: 1.25rem;
}
.contact-card > p:not(.section-index) {
  position: relative;
  z-index: 1;
  max-width: 680px;
  margin: 1.5rem 0 0;
  color: var(--muted);
}
.contact-actions {
  position: relative;
  z-index: 1;
}
.contact-actions .text-link {
  min-height: 49px;
  padding: 0.72rem 0.25rem;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  border-bottom: 1px solid var(--ink);
  font-size: 0.82rem;
  font-weight: 800;
}

footer {
  width: min(1280px, calc(100% - 48px));
  min-height: 82px;
  margin: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  border-top: 1px solid var(--line);
  color: #6b7180;
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

@media (max-width: 1050px) {
  .site-header {
    grid-template-columns: auto 1fr auto;
  }
  .site-header nav {
    justify-self: center;
  }
  .hero {
    grid-template-columns: 1fr;
    min-height: auto;
  }
  .hero-copy {
    max-width: 780px;
  }
  .hero-demo {
    max-width: 760px;
  }
  .section-heading {
    grid-template-columns: 0.55fr 1.4fr;
  }
  .section-heading > p:last-child {
    grid-column: 2;
  }
  .research-card {
    grid-template-columns: 54px 1fr;
  }
  .paper-summary {
    grid-column: 2;
  }
  .story-heading {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  .method-grid,
  .metric-strip {
    grid-template-columns: repeat(2, 1fr);
  }
  .method-grid article:nth-child(2) {
    border-right: 0;
  }
  .method-grid article:nth-child(-n + 2) {
    border-bottom: 1px solid var(--dark-line);
  }
}

@media (max-width: 800px) {
  html {
    scroll-padding-top: 122px;
  }
  .site-header {
    min-height: 112px;
    padding: 0 18px;
    grid-template-columns: 1fr auto;
    grid-template-rows: 62px 50px;
  }
  .site-header nav {
    width: calc(100vw - 36px);
    grid-column: 1 / -1;
    grid-row: 2;
    justify-self: stretch;
    justify-content: flex-start;
    overflow-x: auto;
    scrollbar-width: none;
    gap: 1.35rem;
    border-top: 1px solid var(--line);
  }
  .site-header nav::-webkit-scrollbar {
    display: none;
  }
  .site-header nav a {
    flex: 0 0 auto;
    padding-block: 0.8rem;
  }
  .proof-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .proof-grid div:nth-child(2) {
    border-right: 0;
  }
  .proof-grid div:nth-child(-n + 2) {
    border-bottom: 1px solid rgba(16, 24, 41, 0.35);
  }
  .section-heading.horizontal {
    grid-template-columns: 1fr;
    align-items: start;
  }
  .experience-grid {
    grid-template-columns: 1fr;
  }
  .signal-grid {
    grid-template-columns: 1fr;
  }
  .signal-grid article {
    min-height: auto;
  }
  .credential-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 600px) {
  .section-shell,
  footer {
    width: min(100% - 28px, 1180px);
  }
  .hero {
    padding: 52px 0 72px;
    gap: 3.2rem;
  }
  .hero h1 {
    font-size: clamp(4.2rem, 25vw, 6.4rem);
  }
  .hero-role {
    font-size: 1.55rem;
  }
  .demo-card {
    padding: 1.05rem;
    box-shadow: 8px 10px 0 rgba(255, 112, 88, 0.25);
  }
  .demo-topline {
    font-size: 0.56rem;
  }
  .probabilities {
    grid-template-columns: 1fr;
  }
  .proof-grid {
    width: 100%;
  }
  .proof-grid div {
    min-height: 96px;
    padding: 0.95rem 1rem;
  }
  .proof-grid div:nth-child(odd) {
    border-left: 0;
  }
  .proof-grid div:nth-child(even) {
    border-right: 0;
  }
  .proof-grid strong {
    font-size: 1.05rem;
  }
  .section-block,
  .econbert-story,
  .contact {
    padding-block: 78px;
  }
  .section-heading {
    grid-template-columns: 1fr;
    gap: 1.35rem;
    margin-bottom: 3rem;
  }
  .section-heading > p:last-child {
    grid-column: 1;
  }
  .research-card {
    grid-template-columns: 1fr;
    gap: 0.9rem;
  }
  .paper-number {
    color: var(--coral);
  }
  .paper-summary {
    grid-column: 1;
  }
  .method-grid,
  .metric-strip {
    grid-template-columns: 1fr;
  }
  .method-grid article,
  .method-grid article:not(:first-child) {
    padding: 1.45rem 0;
    border-right: 0;
    border-bottom: 1px solid var(--dark-line);
  }
  .metric-strip div {
    border-right: 0;
    border-bottom: 1px solid #34415b;
  }
  .metric-strip div:last-child {
    border-bottom: 0;
  }
  .researcher-note {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
  .contact-card {
    padding: 1.7rem 1.3rem;
  }
  .contact-actions {
    align-items: stretch;
    flex-direction: column;
  }
  .contact-actions .button-primary,
  .contact-actions .button-secondary {
    width: 100%;
  }
  .contact-actions .text-link {
    width: max-content;
  }
  footer {
    padding-block: 1.25rem;
    flex-direction: column;
    align-items: flex-start;
    justify-content: center;
  }
}

@media print {
  .site-header,
  .hero-demo,
  .proof-bar,
  .contact,
  footer {
    display: none;
  }
  body {
    background: white;
    color: black;
  }
  .section-shell {
    width: 100%;
  }
  .hero {
    min-height: auto;
    padding: 1rem 0 2rem;
  }
  .section-block,
  .econbert-story,
  .credentials {
    padding: 2rem 0;
  }
  .econbert-story,
  .credentials {
    background: white;
    color: black;
  }
  .section-index.light,
  .story-heading > p,
  .method-grid p,
  .credential-grid li span {
    color: #333;
  }
}

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

/* Multi-page portfolio */

.site-header nav a {
  position: relative;
}

.site-header nav a.active::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: -0.55rem;
  left: 0;
  height: 2px;
  background: var(--coral);
}

.home-directory {
  padding-block: 92px 112px;
  display: grid;
  grid-template-columns: 0.48fr 1.52fr;
  gap: clamp(2.5rem, 7vw, 7rem);
  align-items: start;
}

.home-directory h2 {
  margin: 1rem 0 0;
  font-family: var(--serif);
  font-size: clamp(2.2rem, 4vw, 3.7rem);
  font-weight: 500;
  line-height: 1;
  letter-spacing: -0.05em;
}

.directory-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.directory-grid a {
  min-height: 225px;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  background: var(--paper);
  transition: background 0.2s ease;
}

.directory-grid a:hover {
  background: var(--white);
}

.directory-grid span {
  color: var(--coral);
  font-family: var(--serif);
  font-size: 0.78rem;
}

.directory-grid strong {
  margin-top: 1.1rem;
  font-family: var(--serif);
  font-size: 1.65rem;
  font-weight: 500;
}

.directory-grid p {
  margin: 0.65rem 0 1.25rem;
  color: var(--muted);
  font-size: 0.78rem;
}

.directory-grid b {
  margin-top: auto;
  font-size: 0.67rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.page-main {
  min-height: calc(100vh - 158px);
}

.page-intro {
  padding-block: clamp(72px, 9vw, 124px) clamp(58px, 7vw, 92px);
  display: grid;
  grid-template-columns: 0.44fr 1.16fr 0.55fr;
  gap: clamp(2rem, 5vw, 4.5rem);
  align-items: start;
}

.page-intro h1,
.econbert-story .story-heading h1,
.contact h1 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(3rem, 6vw, 5.8rem);
  font-weight: 500;
  line-height: 0.96;
  letter-spacing: -0.065em;
}

.page-intro > p:last-child {
  margin: 0.25rem 0 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.paper-archive {
  border-top: 1px solid var(--ink);
}

.paper-entry {
  position: relative;
  padding: clamp(2.2rem, 5vw, 4rem) 0;
  display: grid;
  grid-template-columns: 84px 1fr;
  gap: clamp(1.25rem, 4vw, 3rem);
  border-bottom: 1px solid var(--line);
}

.paper-entry::after {
  content: "";
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 84px;
  height: 3px;
}

.paper-entry.coral::after {
  background: var(--coral);
}

.paper-entry.aqua::after {
  background: var(--aqua);
}

.paper-entry.violet::after {
  background: var(--violet);
}

.paper-entry.gold::after {
  background: #e6b84e;
}

.paper-content {
  max-width: 980px;
}

.paper-content h2 {
  max-width: 900px;
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(1.9rem, 3.5vw, 3.25rem);
  font-weight: 500;
  line-height: 1.07;
  letter-spacing: -0.045em;
}

.paper-content .paper-authors {
  margin-top: 1rem;
  color: #4f586b;
  font-size: 0.86rem;
  font-style: normal;
}

.paper-content .paper-authors strong {
  color: var(--ink);
}

.paper-status {
  margin: 0.45rem 0 0;
  color: #6b7180;
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.publication-link {
  width: max-content;
  margin-top: 1.2rem;
  display: inline-flex;
  gap: 0.5rem;
  align-items: center;
  border-bottom: 1px solid var(--ink);
  font-size: 0.75rem;
  font-weight: 800;
}

.abstract-panel {
  max-width: 900px;
  margin-top: 1.6rem;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.abstract-panel summary {
  padding: 0.95rem 0;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  font-size: 0.72rem;
  font-weight: 850;
  letter-spacing: 0.1em;
  list-style: none;
  text-transform: uppercase;
  cursor: pointer;
}

.abstract-panel summary::-webkit-details-marker {
  display: none;
}

.abstract-panel summary span {
  color: var(--coral);
  font-size: 1.1rem;
  transition: transform 0.2s ease;
}

.abstract-panel[open] summary span {
  transform: rotate(45deg);
}

.abstract-panel > p {
  margin: 0 0 1rem;
  color: #4e576a;
  font-size: 0.88rem;
  line-height: 1.75;
}

.page-cta {
  margin-block: 72px 100px;
  padding: 1.3rem 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  border-block: 1px solid var(--line);
}

.page-cta p {
  max-width: 660px;
  margin: 0;
  color: var(--muted);
  font-size: 0.85rem;
}

.page-cta .button-primary {
  flex: 0 0 auto;
}

.dark-page {
  background: var(--ink);
}

.econbert-story.standalone {
  min-height: calc(100vh - 76px);
  padding-top: clamp(74px, 9vw, 124px);
}

.econbert-story .story-heading h1 {
  margin-top: 1.2rem;
}

.story-intro > p {
  margin: 0;
  color: #b5bed0;
}

.light-link {
  width: max-content;
  margin-top: 1.5rem;
  display: inline-flex;
  gap: 0.5rem;
  border-bottom: 1px solid #75839e;
  color: var(--white);
  font-size: 0.75rem;
  font-weight: 800;
}

.method-grid h2 {
  margin: 1.45rem 0 0.5rem;
  font-size: 0.95rem;
}

.model-purpose {
  margin-top: clamp(4rem, 8vw, 7rem);
  display: grid;
  grid-template-columns: 1fr 0.8fr;
  gap: clamp(3rem, 8vw, 7rem);
  align-items: start;
}

.model-purpose h2,
.chart-heading h2 {
  margin: 1rem 0 0;
  font-family: var(--serif);
  font-size: clamp(2.2rem, 4.5vw, 4.2rem);
  font-weight: 500;
  line-height: 1;
  letter-spacing: -0.052em;
}

.purpose-copy p {
  margin: 0 0 1.2rem;
  color: #b5bed0;
  font-size: 0.9rem;
}

.chart-section {
  margin-top: clamp(5rem, 10vw, 9rem);
}

.chart-heading {
  display: grid;
  grid-template-columns: 1.2fr 0.55fr;
  gap: clamp(3rem, 8vw, 7rem);
  align-items: end;
}

.chart-heading > p {
  margin: 0;
  color: #a7b1c5;
  font-size: 0.8rem;
}

.split-chart {
  margin-top: 3rem;
}

.split-chart + .split-chart {
  margin-top: 2.5rem;
}

.chart-crop {
  position: relative;
  overflow: hidden;
  width: 100%;
  background: #fff;
  border: 1px solid #3b4761;
}

.chart-crop-top {
  aspect-ratio: 3 / 1;
}

.chart-crop-bottom {
  aspect-ratio: 2.82 / 1;
}

.chart-crop img {
  position: absolute;
  top: 0;
  left: 0;
  display: block;
  width: 100%;
  max-width: none;
  height: auto;
  border: 0;
}

.chart-crop-bottom img {
  transform: translateY(-65.1%);
}

.dark-footer {
  border-top-color: var(--dark-line);
  color: #9aa6bc;
}

.compact-intro {
  grid-template-columns: 0.42fr 1.15fr 0.55fr;
}

.experience-layout {
  display: grid;
  grid-template-columns: minmax(280px, 0.72fr) minmax(0, 1.28fr);
  gap: clamp(3rem, 8vw, 7rem);
  align-items: start;
}

.education-column {
  position: sticky;
  top: 106px;
}

.column-heading {
  padding-bottom: 1rem;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  border-bottom: 1px solid var(--ink);
}

.column-heading span {
  color: #8a8f9c;
  font-size: 0.62rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.column-heading h2 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(1.75rem, 3vw, 2.45rem);
  font-weight: 500;
  letter-spacing: -0.04em;
}

.education-timeline {
  margin: 0;
  padding: 0;
  list-style: none;
}

.education-timeline li {
  padding: 1.35rem 0;
  display: grid;
  border-bottom: 1px solid var(--line);
}

.education-timeline li > span,
.timeline-list time {
  color: #767d8c;
  font-size: 0.64rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.education-timeline strong {
  margin-top: 0.4rem;
  font-family: var(--serif);
  font-size: 1.12rem;
  font-weight: 600;
}

.education-timeline p {
  margin: 0.12rem 0 0;
  color: #4f586b;
  font-size: 0.78rem;
}

.education-timeline small {
  margin-top: 0.18rem;
  color: #858b98;
  font-size: 0.67rem;
}

.skills-panel {
  margin-top: 2rem;
  padding: 1.2rem;
  background: var(--paper-deep);
}

.skills-panel .tags {
  margin-top: 0.9rem;
}

.timeline-list article {
  padding: 1.65rem 0;
  border-bottom: 1px solid var(--line);
}

.timeline-list article:first-child {
  padding-top: 1.35rem;
}

.timeline-list header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1.5rem;
}

.timeline-list h3 {
  margin: 0;
  font-family: var(--serif);
  font-size: 1.35rem;
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.025em;
}

.timeline-list header p {
  margin: 0.2rem 0 0;
  color: #6b7180;
  font-size: 0.73rem;
}

.timeline-list time {
  flex: 0 0 auto;
  padding-top: 0.3rem;
  white-space: nowrap;
}

.timeline-list ul {
  margin: 1rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.55rem;
  list-style: none;
}

.timeline-list li {
  position: relative;
  padding-left: 1.15rem;
  color: #4f586b;
  font-size: 0.8rem;
}

.timeline-list li::before {
  content: "↗";
  position: absolute;
  left: 0;
  color: var(--coral);
  font-weight: 800;
}

.teaching-heading {
  margin-top: clamp(4rem, 8vw, 7rem);
}

.course-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  column-gap: 1.5rem;
}

.experience-layout + .page-cta {
  margin-top: 92px;
}

.contact-main {
  min-height: calc(100vh - 158px);
  display: flex;
  align-items: center;
}

.standalone-contact {
  width: min(1180px, calc(100% - 48px));
  padding-block: 72px;
}

.contact h1 {
  position: relative;
  z-index: 1;
  max-width: 980px;
  margin-top: 1.25rem;
}

.contact-meta {
  position: relative;
  z-index: 1;
  margin-top: 3rem;
  padding-top: 1rem;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  border-top: 1px solid var(--line);
  color: #737987;
  font-size: 0.67rem;
  font-weight: 750;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

@media (max-width: 1050px) {
  .home-directory,
  .page-intro,
  .compact-intro {
    grid-template-columns: 0.5fr 1.5fr;
  }

  .home-directory > .directory-grid,
  .page-intro > p:last-child {
    grid-column: 2;
  }

  .experience-layout {
    grid-template-columns: 1fr;
  }

  .education-column {
    position: static;
  }

  .education-timeline {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    column-gap: 2rem;
  }

  .model-purpose,
  .chart-heading {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
}

@media (max-width: 800px) {
  .site-header nav a.active::after {
    bottom: 0.45rem;
  }

  .home-directory,
  .page-intro,
  .compact-intro {
    grid-template-columns: 1fr;
  }

  .home-directory > .directory-grid,
  .page-intro > p:last-child {
    grid-column: 1;
  }

  .paper-entry {
    grid-template-columns: 54px 1fr;
  }

  .page-cta {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (max-width: 600px) {
  .home-directory {
    padding-block: 72px 82px;
  }

  .directory-grid {
    grid-template-columns: 1fr;
  }

  .directory-grid a {
    min-height: 195px;
  }

  .page-intro {
    padding-block: 58px 48px;
  }

  .paper-entry {
    grid-template-columns: 1fr;
  }

  .paper-entry::after {
    width: 48px;
  }

  .paper-content h2 {
    font-size: 1.75rem;
  }

  .page-cta {
    margin-block: 56px 72px;
  }

  .page-cta .button-primary {
    width: 100%;
  }

  .econbert-story.standalone {
    padding-top: 62px;
  }

  .chart-crop-top {
    aspect-ratio: 2.35 / 1;
  }

  .chart-crop-top img {
    width: 125%;
  }

  .chart-crop-bottom {
    aspect-ratio: 2.2 / 1;
  }

  .chart-crop-bottom img {
    width: 125%;
  }

  .education-timeline,
  .course-grid {
    grid-template-columns: 1fr;
  }

  .timeline-list header {
    flex-direction: column;
    gap: 0.5rem;
  }

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