:root {
  --green: #84bc40;
  --ink: #101010;
  --text: #2f2f2f;
  --muted: #666666;
  --line: #d7d7d7;
  --soft-line: #e9e9e9;
  --page: #ffffff;
  --measure: 1180px;
  --mono: Menlo, "Courier New", monospace;
  --sans: "Helvetica Neue", Helvetica, Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--page);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.5;
  letter-spacing: 0;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  display: block;
  max-width: 100%;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: grid;
  grid-template-columns: 1fr auto auto;
  align-items: center;
  gap: 28px;
  max-width: var(--measure);
  margin: 0 auto;
  padding: 22px 28px 18px;
  background: rgba(255, 255, 255, 0.94);
  border-bottom: 1px solid var(--soft-line);
}

.site-mark,
h1,
h2,
h3,
.eyebrow,
.tab-button,
.text-action,
.pub-system,
.timeline-list span,
.cv-link {
  font-family: var(--mono);
  letter-spacing: 0;
}

.site-mark {
  font-size: 17px;
  font-weight: 700;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 24px;
  color: var(--muted);
  font-size: 14px;
}

.site-nav a,
.cv-link,
.text-action {
  transition: color 160ms ease, border-color 160ms ease;
}

.site-nav a:hover,
.cv-link:hover,
.text-action:hover,
.contact-grid a:hover {
  color: var(--green);
}

.cv-link {
  border-bottom: 2px solid var(--green);
  font-size: 14px;
  font-weight: 700;
}

.hero {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 88px 28px 56px;
}

.hero-copy {
  max-width: 830px;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  font-size: 56px;
  line-height: 1;
  font-weight: 700;
}

.hero-lede {
  max-width: 780px;
  margin: 28px 0 0;
  color: var(--text);
  font-size: 23px;
  line-height: 1.28;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  margin-top: 28px;
}

.text-action {
  border-bottom: 2px solid var(--green);
  color: var(--ink);
  font-size: 14px;
  font-weight: 700;
}

.hero-figure {
  margin: 54px 0 0;
  padding: 24px 0 0;
  border-top: 1px solid var(--green);
}

.hero-figure img,
.architecture-figure img {
  width: 100%;
  height: auto;
}

.hero-system {
  position: relative;
  min-height: 0;
  margin: 54px 0 0;
  padding: 48px 42px 40px;
  overflow: hidden;
  border-top: 1px solid var(--green);
  border-bottom: 1px solid var(--soft-line);
  background: #ffffff;
}

.hero-system::before,
.hero-system::after {
  display: none;
}

.system-map {
  position: absolute;
  inset: 22px 38px;
  opacity: 0.34;
  background:
    radial-gradient(ellipse at 20% 28%, rgba(255, 255, 255, 0) 0 28%, #ffffff 29% 100%),
    radial-gradient(ellipse at 55% 40%, rgba(255, 255, 255, 0) 0 34%, #ffffff 35% 100%),
    radial-gradient(ellipse at 78% 55%, rgba(255, 255, 255, 0) 0 26%, #ffffff 27% 100%);
  pointer-events: none;
}

.system-dot-grid {
  position: absolute;
  inset: 0;
  opacity: 1;
  background:
    radial-gradient(circle, rgba(175, 175, 175, 0.55) 1px, transparent 1.6px) 0 0 / 9px 9px;
  pointer-events: none;
}

.system-row {
  position: relative;
  z-index: 1;
  display: grid;
  align-items: start;
}

.system-row-top {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 40px 32px;
}

.system-row-bottom {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 28px;
  margin-top: 40px;
}

.system-row-bottom .model-chip {
  grid-column: auto;
}

.system-label {
  color: var(--ink);
  font-family: var(--mono);
  font-size: 19px;
  font-weight: 700;
  line-height: 1.18;
}

.system-label span {
  display: block;
  color: var(--muted);
  font-size: 12px;
}

.system-label-right {
  text-align: left;
}

.system-label,
.signal-card,
.model-chip {
  min-width: 0;
}

.signal-card,
.model-chip {
  border: 1px solid rgba(132, 188, 64, 0.72);
  background: rgba(255, 255, 255, 0.92);
  box-shadow: 0 12px 28px rgba(16, 16, 16, 0.05);
}

.signal-card {
  min-height: 86px;
  padding: 17px 16px;
  color: var(--text);
}

.signal-card span {
  display: block;
  margin-bottom: 7px;
  color: var(--ink);
  font-family: var(--mono);
  font-size: 14px;
  font-weight: 700;
}

.system-line {
  display: none;
}

.system-line span {
  position: absolute;
  top: -5px;
  width: 11px;
  height: 11px;
  border: 1px solid var(--green);
  border-radius: 50%;
  background: #ffffff;
}

.system-line span:nth-child(1) {
  left: 2%;
}

.system-line span:nth-child(2) {
  left: 23%;
}

.system-line span:nth-child(3) {
  left: 48%;
}

.system-line span:nth-child(4) {
  left: 73%;
}

.system-line span:nth-child(5) {
  right: 2%;
}

.system-core {
  display: none;
}

.core-rings,
.core-rings::before,
.core-rings::after {
  position: absolute;
  border: 1px solid rgba(132, 188, 64, 0.62);
  border-radius: 50%;
  content: "";
}

.core-rings {
  inset: 0;
}

.core-rings::before {
  inset: 18px;
}

.core-rings::after {
  inset: 35px;
  border-width: 2px;
}

.core-copy {
  position: relative;
  display: grid;
  place-items: center;
  width: 128px;
  height: 128px;
  padding: 16px;
  border-radius: 50%;
  background: #ffffff;
  text-align: center;
}

.core-copy strong {
  display: block;
  font-family: var(--mono);
  font-size: 15px;
  line-height: 1.15;
}

.core-copy span {
  display: block;
  margin-top: 7px;
  color: var(--muted);
  font-size: 11px;
  line-height: 1.15;
}

.model-chip {
  display: grid;
  min-height: 46px;
  place-items: center;
  color: var(--text);
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 700;
}

.section {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 54px 28px 36px;
}

.section-heading {
  margin-bottom: 24px;
  border-bottom: 1px solid var(--green);
}

h2 {
  margin: 0 0 8px;
  font-size: 28px;
  line-height: 1.1;
  font-weight: 700;
  text-transform: uppercase;
}

h3 {
  margin: 0 0 14px;
  font-size: 17px;
  line-height: 1.25;
}

p {
  margin: 0;
  color: var(--text);
}

.two-column {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 54px;
}

.two-column article + article {
  border-left: 1px solid var(--line);
  padding-left: 54px;
}

.architecture-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
}

.architecture-text p {
  max-width: 760px;
  color: var(--text);
  font-size: 20px;
  line-height: 1.45;
}

.research-pillars {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0;
  margin: 6px 0 0;
  border-top: 1px solid var(--soft-line);
  border-bottom: 1px solid var(--soft-line);
}

.research-pillars div {
  padding: 17px 20px 18px 0;
  border-right: 1px solid var(--soft-line);
}

.research-pillars div + div {
  padding-left: 20px;
}

.research-pillars div:last-child {
  border-right: 0;
}

.research-pillars dt {
  font-family: var(--mono);
  font-size: 15px;
  font-weight: 700;
  line-height: 1.25;
}

.research-pillars dd {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.35;
}

.architecture-figure {
  width: min(100%, 960px);
  margin: 6px auto 0;
  border: 1px solid var(--soft-line);
}

.publication-tools {
  display: inline-flex;
  gap: 0;
  margin-bottom: 18px;
  border: 1px solid var(--line);
}

.tab-button {
  min-width: 116px;
  min-height: 38px;
  padding: 0 16px;
  border: 0;
  border-right: 1px solid var(--line);
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-size: 13px;
  font-weight: 700;
}

.tab-button:last-child {
  border-right: 0;
}

.tab-button.is-active {
  background: var(--green);
  color: #ffffff;
}

.publication-list {
  border-top: 1px solid var(--line);
}

.publication-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 180px;
  gap: 26px;
  padding: 20px 0;
  border-bottom: 1px solid var(--soft-line);
}

.pub-title {
  grid-column: 1;
  color: var(--ink);
  font-weight: 700;
}

.pub-title a {
  border-bottom: 1px solid transparent;
  transition: color 160ms ease, border-color 160ms ease;
}

.pub-title a:hover {
  color: var(--green);
  border-color: var(--green);
}

.pub-meta {
  grid-column: 1;
  color: var(--muted);
  font-size: 15px;
}

.pub-system {
  grid-column: 2;
  grid-row: 1 / span 2;
  align-self: start;
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

.publication-more {
  grid-template-columns: 1fr;
  padding: 16px 0 18px;
}

.publication-more-button {
  display: grid;
  gap: 8px;
  width: 100%;
  padding: 0;
  border: 0;
  background: transparent;
  color: inherit;
  font: inherit;
  text-align: left;
  cursor: pointer;
}

.publication-more .pub-title {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 22px;
  line-height: 1;
}

.publication-more-button:hover .pub-title,
.publication-more-button:hover .pub-meta {
  color: var(--green);
}

.publication-more .pub-meta {
  max-width: 620px;
}

.compact-section {
  padding-bottom: 44px;
}

.timeline-list {
  position: relative;
  padding-left: 26px;
}

.timeline-list::before {
  position: absolute;
  top: 5px;
  bottom: 5px;
  left: 5px;
  width: 1px;
  background: var(--line);
  content: "";
}

.timeline-list p {
  position: relative;
  margin-bottom: 10px;
}

.timeline-list p::before {
  position: absolute;
  top: 7px;
  left: -26px;
  width: 9px;
  height: 9px;
  border: 1px solid #afafaf;
  border-radius: 50%;
  background: #ffffff;
  content: "";
}

.timeline-list span {
  display: inline-block;
  width: 96px;
  color: var(--ink);
  font-weight: 700;
}

.skills-heading {
  margin-top: 26px;
}

.contact-section {
  padding-bottom: 80px;
}

.contact-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 54px;
}

.contact-grid a {
  border-bottom: 1px solid var(--green);
}

[hidden] {
  display: none !important;
}

@media (max-width: 860px) {
  .site-header {
    grid-template-columns: 1fr auto;
    gap: 16px;
    padding: 18px 20px 14px;
  }

  .site-nav {
    grid-column: 1 / -1;
    grid-row: 2;
    justify-content: space-between;
    gap: 12px;
    overflow-x: auto;
    padding-top: 4px;
  }

  .cv-link {
    grid-column: 2;
    grid-row: 1;
    justify-self: end;
  }

  .hero,
  .section {
    padding-left: 20px;
    padding-right: 20px;
  }

  h1 {
    font-size: 42px;
  }

  .hero-lede {
    font-size: 20px;
  }

  .two-column,
  .architecture-layout,
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

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

  .research-pillars div {
    border-bottom: 1px solid var(--soft-line);
  }

  .research-pillars div:nth-child(2n) {
    border-right: 0;
  }

  .research-pillars div:nth-last-child(-n + 2) {
    border-bottom: 0;
  }

  .hero-system {
    min-height: 0;
    padding: 36px 28px 32px;
  }

  .hero-system::before,
  .hero-system::after,
  .system-line,
  .system-core {
    display: none;
  }

  .system-row-top,
  .system-row-bottom {
    grid-template-columns: 1fr 1fr;
  }

  .system-row-bottom .model-chip {
    grid-column: auto !important;
  }

  .system-row-bottom {
    margin-top: 18px;
  }

  .system-label-right {
    text-align: left;
  }

  .two-column article + article {
    border-left: 0;
    border-top: 1px solid var(--line);
    padding-left: 0;
    padding-top: 28px;
  }

  .publication-item {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .pub-title,
  .pub-meta,
  .pub-system {
    grid-column: 1;
    grid-row: auto;
  }
}

@media (max-width: 540px) {
  .site-nav {
    font-size: 13px;
  }

  .hero {
    padding-top: 58px;
  }

  h1 {
    font-size: 36px;
  }

  h2 {
    font-size: 24px;
  }

  .hero-lede {
    font-size: 18px;
  }

  .hero-system {
    padding: 30px 20px 26px;
  }

  .system-row-top,
  .system-row-bottom {
    grid-template-columns: 1fr;
  }

  .research-pillars {
    grid-template-columns: 1fr;
  }

  .research-pillars div,
  .research-pillars div + div {
    padding-left: 0;
    border-right: 0;
  }

  .research-pillars div:nth-last-child(-n + 2) {
    border-bottom: 1px solid var(--soft-line);
  }

  .research-pillars div:last-child {
    border-bottom: 0;
  }

  .system-label {
    font-size: 18px;
  }

  .signal-card {
    min-height: 0;
  }

  .publication-tools {
    display: grid;
    grid-template-columns: 1fr;
    width: 100%;
  }

  .tab-button {
    width: 100%;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .tab-button:last-child {
    border-bottom: 0;
  }

  .timeline-list span {
    display: block;
    width: auto;
    margin-bottom: 2px;
  }
}