:root {
  --paper: #f8fafc;
  --surface: #ffffff;
  --ink: #15181d;
  --muted: #66707d;
  --faint: #929eac;
  --line: #d8dee6;
  --line-dark: #aeb8c4;
  --blue: #1657b8;
  --blue-dark: #10478f;
  --blue-soft: #e7eef9;
  --page: 1160px;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 92px;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  text-rendering: optimizeLegibility;
}

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

a:hover,
a:focus-visible {
  color: var(--blue);
}

a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 4px;
}

.page {
  width: min(var(--page), calc(100% - 48px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(248, 250, 252, 0.96);
  backdrop-filter: blur(12px);
}

.header-inner {
  display: flex;
  min-height: 78px;
  align-items: flex-end;
  justify-content: space-between;
  gap: 2rem;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--ink);
}

.site-name {
  display: grid;
  gap: 1px;
  font-size: 1rem;
  font-weight: 750;
  letter-spacing: -0.02em;
}

.site-name small {
  color: var(--muted);
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.015em;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 1.6rem;
  align-items: center;
  color: #4e5661;
  font-size: 0.78rem;
  font-weight: 650;
}

.site-nav a[aria-current="page"] { color: var(--blue); }

.hero {
  display: grid;
  grid-template-columns: 170px minmax(0, 1fr) 295px;
  gap: 38px;
  padding: 3.5rem 0 3rem;
  border-bottom: 1px solid var(--line);
}

.eyebrow,
.section-kicker,
.meta,
.count,
.article-label {
  font-size: 0.68rem;
  font-weight: 750;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.eyebrow,
.section-kicker,
.article-label { color: var(--blue); }

.eyebrow { padding-top: 0.55rem; }

.hero h1 {
  max-width: 690px;
  margin: 0;
  font-size: clamp(2.55rem, 5.2vw, 4.5rem);
  font-weight: 610;
  letter-spacing: -0.058em;
  line-height: 0.99;
}

.hero h1 em {
  color: var(--blue);
  font-style: normal;
}

.hero-copy {
  padding-top: 0.35rem;
  color: #505965;
  font-size: 0.9rem;
}

.hero-copy p { margin: 0 0 1.15rem; }

.topic-line,
.profile-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem 0.8rem;
}

.topic-line {
  color: var(--blue);
  font-size: 0.71rem;
  font-weight: 700;
}

.topic-line span::before {
  margin-right: 0.45rem;
  color: var(--faint);
  content: "/";
}

.profile-links {
  margin-top: 1rem;
  font-size: 0.74rem;
  font-weight: 650;
}

.profile-links a { border-bottom: 1px solid var(--line-dark); }

.index-section {
  display: grid;
  grid-template-columns: 170px minmax(0, 1fr);
  gap: 38px;
  padding: 2.4rem 0 4.2rem;
}

.index-sidebar {
  display: flex;
  min-height: 500px;
  flex-direction: column;
  padding-right: 24px;
  border-right: 1px solid var(--line);
}

.index-sidebar .section-kicker { margin-bottom: 1.4rem; }

.category-list {
  display: grid;
  gap: 0.72rem;
  color: var(--muted);
  font-size: 0.8rem;
}

.category-list a {
  display: flex;
  justify-content: space-between;
  gap: 0.75rem;
}

.category-list a:first-child {
  color: var(--ink);
  font-weight: 700;
}

.category-list b {
  color: var(--faint);
  font-size: 0.65rem;
}

.sidebar-note {
  margin-top: auto;
  padding-top: 1.4rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.72rem;
}

.sidebar-note strong {
  display: block;
  margin-bottom: 0.4rem;
  color: var(--ink);
}

.writing-head,
.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1.5rem;
}

.writing-head { margin-bottom: 1rem; }

.writing-head h2,
.section-head h2 {
  margin: 0;
  font-size: 1rem;
  letter-spacing: -0.015em;
}

.writing-head a,
.section-head a {
  color: var(--blue);
  font-size: 0.74rem;
  font-weight: 700;
}

.featured-post,
.post-row {
  display: grid;
  grid-template-columns: 128px minmax(0, 1fr) 70px;
  gap: 24px;
}

.featured-post {
  align-items: start;
  padding: 1.55rem 0 1.75rem;
  border-top: 2px solid var(--blue);
  border-bottom: 1px solid var(--ink);
}

.meta {
  color: var(--muted);
  line-height: 1.55;
}

.meta strong {
  display: block;
  margin-bottom: 0.45rem;
  color: var(--blue);
}

.featured-post h3 {
  max-width: 680px;
  margin: 0 0 0.6rem;
  font-size: clamp(1.65rem, 3vw, 2.35rem);
  font-weight: 620;
  letter-spacing: -0.04em;
  line-height: 1.1;
}

.featured-post p {
  max-width: 700px;
  margin: 0;
  color: #596370;
  font-size: 0.86rem;
}

.read-time,
.count {
  justify-self: end;
  color: var(--faint);
  white-space: nowrap;
}

.post-list { border-bottom: 1px solid var(--ink); }

.post-row {
  min-height: 86px;
  align-items: center;
  border-bottom: 1px solid var(--line);
}

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

.post-row h3 {
  margin: 0;
  font-size: 1rem;
  font-weight: 650;
  letter-spacing: -0.018em;
  line-height: 1.3;
}

.post-row:hover h3,
.featured-post:hover h3 { color: var(--blue); }

.archive-link {
  display: inline-block;
  margin-top: 1.2rem;
  color: var(--blue);
  font-size: 0.78rem;
  font-weight: 700;
}

.site-section {
  padding: 4rem 0;
  border-top: 1px solid var(--ink);
}

.section-head {
  margin-bottom: 1.8rem;
}

.section-head p {
  max-width: 610px;
  margin: 0;
  color: var(--muted);
  font-size: 0.82rem;
}

.research-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border-top: 1px solid var(--line);
}

.research-item {
  display: grid;
  grid-template-columns: 88px 1fr;
  gap: 1.25rem;
  min-height: 150px;
  padding: 1.4rem 1.4rem 1.4rem 0;
  border-bottom: 1px solid var(--line);
}

.research-item:nth-child(odd) { border-right: 1px solid var(--line); }
.research-item:nth-child(even) { padding-left: 1.4rem; }

.research-item .venue {
  color: var(--blue);
  font-size: 0.68rem;
  font-weight: 750;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.research-item h3 {
  margin: 0 0 0.4rem;
  font-size: 0.94rem;
  line-height: 1.35;
}

.research-item p {
  margin: 0;
  color: var(--muted);
  font-size: 0.77rem;
}

.project-strip {
  display: grid;
  grid-template-columns: 210px minmax(0, 1fr) 140px;
  gap: 2rem;
  align-items: start;
  margin-top: 2.4rem;
  padding: 1.5rem 0;
  border-top: 2px solid var(--blue);
  border-bottom: 1px solid var(--line);
}

.project-strip h3 { margin: 0; font-size: 1rem; }
.project-strip p { margin: 0; color: var(--muted); font-size: 0.82rem; }
.project-strip a { justify-self: end; color: var(--blue); font-size: 0.76rem; font-weight: 700; }

.about-grid {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 3rem;
}

.profile-card img {
  display: block;
  width: 104px;
  height: 120px;
  margin-bottom: 1rem;
  border: 1px solid var(--line);
  object-fit: cover;
  object-position: center 27%;
  filter: grayscale(15%);
}

.profile-card p {
  margin: 0.3rem 0;
  color: var(--muted);
  font-size: 0.76rem;
}

.record-columns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0 2.5rem;
}

.record-group { margin-bottom: 2rem; }

.record-group h3 {
  margin: 0 0 0.7rem;
  color: var(--blue);
  font-size: 0.68rem;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}

.record-list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.record-list li {
  display: grid;
  grid-template-columns: 90px 1fr;
  gap: 1rem;
  padding: 0.72rem 0;
  border-bottom: 1px solid var(--line);
  font-size: 0.79rem;
}

.record-list span { color: var(--muted); }
.record-list strong { font-weight: 650; }

.site-footer {
  padding: 2rem 0 3rem;
  border-top: 1px solid var(--ink);
  color: var(--muted);
  font-size: 0.74rem;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
}

.footer-inner p { margin: 0; }

/* Writing archive */
.archive-hero {
  display: grid;
  grid-template-columns: 170px minmax(0, 1fr);
  gap: 38px;
  padding: 4rem 0 3rem;
  border-bottom: 1px solid var(--line);
}

.archive-hero h1 {
  max-width: 760px;
  margin: 0;
  font-size: clamp(1.5rem, 2.2vw, 2rem);
  font-weight: 610;
  letter-spacing: -0.06em;
  line-height: 0.95;
}

.archive-hero p {
  max-width: 650px;
  margin: 1.5rem 0 0;
  color: var(--muted);
}

.archive-layout {
  display: grid;
  grid-template-columns: 170px minmax(0, 1fr);
  gap: 38px;
  padding: 2.5rem 0 4.5rem;
}

.archive-nav {
  align-self: start;
  position: sticky;
  top: 108px;
  display: grid;
  gap: 0.6rem;
  padding-right: 24px;
  border-right: 1px solid var(--line);
  font-size: 0.78rem;
}

.archive-nav a { color: var(--muted); }
.archive-nav a:hover { color: var(--blue); }

.archive-group { margin-bottom: 3.5rem; }

.archive-group h2 {
  margin: 0 0 0.8rem;
  color: var(--blue);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.archive-entry {
  display: grid;
  grid-template-columns: 130px minmax(0, 1fr) 70px;
  gap: 1.5rem;
  padding: 1.25rem 0;
  border-top: 1px solid var(--line);
}

.archive-entry:last-child { border-bottom: 1px solid var(--line); }
.archive-entry h3 { margin: 0 0 0.25rem; font-size: 1.05rem; }
.archive-entry p { margin: 0; color: var(--muted); font-size: 0.8rem; }

/* Article pages */
.article-shell {
  width: min(760px, calc(100% - 48px));
  margin: 0 auto;
}

.article-header {
  padding: 4.8rem 0 2.6rem;
  border-bottom: 1px solid var(--ink);
}

.article-header h1 {
  margin: 0.8rem 0 1.2rem;
  font-size: clamp(2.35rem, 6vw, 4.4rem);
  font-weight: 610;
  letter-spacing: -0.055em;
  line-height: 1.01;
}

.article-deck {
  max-width: 680px;
  margin: 0;
  color: var(--muted);
  font-size: 1.05rem;
}

.article-byline {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem 1.2rem;
  margin-top: 1.5rem;
  color: var(--faint);
  font-size: 0.72rem;
}

.article-body {
  padding: 2.8rem 0 4.5rem;
  color: #303740;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.08rem;
  line-height: 1.85;
}

.article-body h2 {
  margin: 2.7rem 0 0.75rem;
  color: var(--ink);
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
}

.article-body p { margin: 0 0 1.25rem; }

.article-body .lead {
  color: var(--ink);
  font-size: 1.25rem;
  line-height: 1.65;
}

.article-body blockquote,
.open-question {
  margin: 2rem 0;
  padding: 1.1rem 1.35rem;
  border-left: 3px solid var(--blue);
  background: var(--blue-soft);
  color: #354354;
}

.architecture-list {
  margin: 2rem 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.architecture-list li {
  display: grid;
  grid-template-columns: 100px 1fr;
  gap: 1.25rem;
  padding: 1.15rem 0;
  border-bottom: 1px solid var(--line);
}

.architecture-list strong {
  color: var(--blue);
  font-family: Inter, sans-serif;
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.architecture-list p { margin: 0; }

.article-discuss {
  margin-top: 3rem;
  padding-top: 1.4rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-family: Inter, sans-serif;
  font-size: 0.8rem;
}

.article-discuss a { color: var(--blue); font-weight: 700; }

@media (max-width: 860px) {
  .page { width: min(100% - 32px, var(--page)); }
  .header-inner { align-items: flex-start; flex-direction: column; gap: 0.8rem; padding: 0.8rem 0; }
  .site-nav { gap: 0.65rem 1rem; }
  .hero { grid-template-columns: 1fr; gap: 1.25rem; padding: 2.7rem 0; }
  .eyebrow { padding-top: 0; }
  .hero-copy { max-width: 650px; }
  .index-section,
  .archive-hero,
  .archive-layout { grid-template-columns: 1fr; gap: 1.5rem; }
  .index-sidebar { min-height: 0; padding: 0 0 1.4rem; border-right: 0; border-bottom: 1px solid var(--line); }
  .sidebar-note { display: none; }
  .category-list { grid-template-columns: repeat(2, 1fr); }
  .research-grid { grid-template-columns: 1fr; }
  .research-item:nth-child(odd) { border-right: 0; }
  .research-item:nth-child(even) { padding-left: 0; }
  .project-strip { grid-template-columns: 1fr; gap: 0.7rem; }
  .project-strip a { justify-self: start; }
  .about-grid { grid-template-columns: 1fr; gap: 2rem; }
  .record-columns { grid-template-columns: 1fr; }
  .archive-nav { position: static; grid-template-columns: repeat(3, auto); justify-content: start; padding: 0 0 1.25rem; border-right: 0; border-bottom: 1px solid var(--line); }
}

@media (max-width: 560px) {
  .hero h1 { font-size: 2.55rem; }
  .featured-post,
  .post-row { grid-template-columns: 82px minmax(0, 1fr); gap: 1rem; }
  .read-time,
  .count { display: none; }
  .section-head { align-items: flex-start; flex-direction: column; gap: 0.45rem; }
  .research-item { grid-template-columns: 66px 1fr; gap: 0.8rem; }
  .archive-entry { grid-template-columns: 90px minmax(0, 1fr); gap: 1rem; }
  .archive-entry .count { display: none; }
  .record-list li { grid-template-columns: 78px 1fr; }
  .footer-inner { flex-direction: column; }
  .article-shell { width: min(100% - 32px, 760px); }
  .article-header { padding-top: 3.3rem; }
  .architecture-list li { grid-template-columns: 1fr; gap: 0.35rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}