:root {
  --text: #1a1a1a;
  --text-muted: #6b6b6b;
  --bg: #fdfcf8;
  --rule: #e6e3da;
  --accent: #5a4a3a;
  --link: #1f3a5f;
  --link-hover: #c0392b;
  --code-bg: #f3f1ea;
  --max-width: 720px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --text: #e8e6e1;
    --text-muted: #a09e98;
    --bg: #1a1916;
    --rule: #2e2c27;
    --accent: #c9b899;
    --link: #9bb6d4;
    --link-hover: #e8a48e;
    --code-bg: #25241f;
  }
}

* { box-sizing: border-box; }

html { font-size: 18px; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "EB Garamond", Georgia, "Times New Roman", serif;
  font-weight: 400;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ---------- layout ---------- */

.site-main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 3rem 1.5rem 4rem;
}

.site-header {
  border-bottom: 1px solid var(--rule);
}

.site-header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1.5rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 1rem;
}

.site-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text);
  text-decoration: none;
  letter-spacing: 0.01em;
}

.site-nav {
  display: flex;
  gap: 1.4rem;
}

.site-nav a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 1rem;
}

.site-nav a:hover {
  color: var(--link-hover);
}

.site-footer {
  border-top: 1px solid var(--rule);
  margin-top: 4rem;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.site-footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-links a {
  color: var(--text-muted);
  text-decoration: none;
  margin-left: 1rem;
}

.footer-links a:hover {
  color: var(--link-hover);
}

/* ---------- typography ---------- */

h1, h2, h3, h4 {
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: -0.005em;
  color: var(--text);
}

h1 { font-size: 2rem; margin: 0 0 1rem; }
h2 { font-size: 1.45rem; margin: 2.5rem 0 0.8rem; }
h3 { font-size: 1.2rem; margin: 2rem 0 0.6rem; }

p { margin: 0 0 1.1rem; }

a {
  color: var(--link);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}

a:hover { color: var(--link-hover); }

blockquote {
  margin: 1.5rem 0;
  padding: 0.2rem 0 0.2rem 1.2rem;
  border-left: 2px solid var(--rule);
  color: var(--text-muted);
  font-style: italic;
}

hr {
  border: 0;
  border-top: 1px solid var(--rule);
  margin: 2.5rem 0;
}

ul, ol { padding-left: 1.5rem; margin: 0 0 1.1rem; }
li { margin-bottom: 0.3rem; }

code {
  font-family: "JetBrains Mono", "SF Mono", Menlo, monospace;
  font-size: 0.88em;
  background: var(--code-bg);
  padding: 0.1em 0.35em;
  border-radius: 3px;
}

pre {
  background: var(--code-bg);
  padding: 1rem 1.2rem;
  border-radius: 4px;
  overflow-x: auto;
  font-size: 0.88em;
  line-height: 1.5;
}

pre code {
  background: transparent;
  padding: 0;
  font-size: 1em;
}

/* ---------- home / intro ---------- */

.intro {
  margin-bottom: 3rem;
}

.intro h1 {
  font-size: 2.2rem;
  margin-bottom: 0.5rem;
}

.intro .lead {
  font-size: 1.05rem;
  color: var(--text-muted);
  font-style: italic;
  line-height: 1.5;
  margin: 0;
}

.intro .lead-cite {
  font-size: 0.9rem;
  color: var(--text-muted);
  font-style: normal;
  margin: 0.5rem 0 0;
}

.intro-with-photo {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.intro-photo {
  width: 180px;
  height: 220px;
  object-fit: cover;
  object-position: center 25%;
  flex-shrink: 0;
  border: 1px solid var(--rule);
}

.intro-text h1 { margin-top: 0; }

/* ---------- about page ---------- */

.about-grid {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 2.5rem;
  margin-top: 1.5rem;
}

.about-sidebar { min-width: 0; }

.about-photo {
  display: block;
  width: 100%;
  height: 220px;
  object-fit: cover;
  object-position: center 25%;
  margin: 0 0 1.2rem;
  border: 1px solid var(--rule);
}

.about-facts {
  margin: 0;
  font-size: 0.95rem;
}

.about-facts dt {
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.7rem;
  margin-top: 0.9rem;
}

.about-facts dt:first-child { margin-top: 0; }

.about-facts dd {
  margin: 0.15rem 0 0;
  color: var(--text);
  font-size: 0.95rem;
}

.about-facts dd a {
  color: var(--link);
  text-decoration: none;
}

.about-facts dd a:hover {
  color: var(--link-hover);
  text-decoration: underline;
}

.about-bio > p:first-child { margin-top: 0; }

@media (max-width: 540px) {
  .intro-with-photo { flex-direction: column; align-items: flex-start; gap: 1rem; }
  .intro-photo { width: 150px; height: 180px; }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  .about-photo { width: 150px; height: 180px; }
}

/* ---------- activity feed ---------- */

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

.activity-item {
  display: grid;
  grid-template-columns: 7rem 6rem 1fr;
  align-items: baseline;
  gap: 1rem;
  padding: 0.7rem 0;
  border-bottom: 1px solid var(--rule);
}

.activity-item:last-child { border-bottom: 0; }

.activity-date {
  color: var(--text-muted);
  font-size: 0.9rem;
  font-variant-numeric: tabular-nums;
}

.activity-kind {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
}

.activity-title {
  text-decoration: none;
  color: var(--text);
  font-size: 1.05rem;
}

.activity-title:hover {
  color: var(--link-hover);
  text-decoration: underline;
}

@media (max-width: 540px) {
  .activity-item {
    grid-template-columns: 1fr;
    gap: 0.15rem;
    padding: 0.8rem 0;
  }
}

/* ---------- post list ---------- */

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

.post-list li {
  display: flex;
  flex-direction: column;
  padding: 0.9rem 0;
  border-bottom: 1px solid var(--rule);
}

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

.post-list .post-link {
  font-size: 1.1rem;
  text-decoration: none;
  color: var(--text);
}

.post-list .post-link:hover {
  color: var(--link-hover);
  text-decoration: underline;
}

.post-list .post-date {
  color: var(--text-muted);
  font-size: 0.9rem;
  font-variant-numeric: tabular-nums;
}

/* ---------- post ---------- */

.post-header {
  margin-bottom: 2rem;
}

.post-title {
  font-size: 2rem;
  margin-bottom: 0.3rem;
}

.post-meta {
  color: var(--text-muted);
  font-size: 0.95rem;
  font-style: italic;
  margin: 0;
}

.post-content img {
  max-width: 100%;
  height: auto;
}

/* ---------- publications ---------- */

.publication {
  padding: 1rem 0;
  border-bottom: 1px solid var(--rule);
}

.publication:last-child { border-bottom: 0; }

.publication-title {
  font-weight: 600;
  margin: 0 0 0.25rem;
}

.publication-authors {
  color: var(--text);
  margin: 0 0 0.2rem;
  font-size: 0.98rem;
}

.publication-venue {
  color: var(--text-muted);
  font-style: italic;
  font-size: 0.95rem;
  margin: 0 0 0.4rem;
}

.publication-links a {
  font-size: 0.9rem;
  margin-right: 0.8rem;
}

.publication-links a:last-child { margin-right: 0; }

.publication-abstract {
  margin-top: 0.4rem;
}

.publication-abstract summary {
  cursor: pointer;
  font-size: 0.9rem;
  color: var(--link);
  list-style: none;
  display: inline-block;
  user-select: none;
}

.publication-abstract summary::-webkit-details-marker { display: none; }
.publication-abstract summary::marker { content: ""; }

.publication-abstract summary::before {
  content: "▸";
  display: inline-block;
  font-size: 0.7em;
  margin-right: 0.4em;
  color: var(--text-muted);
  transition: transform 0.15s ease;
}

.publication-abstract[open] summary::before {
  transform: rotate(90deg);
}

.publication-abstract summary:hover {
  color: var(--link-hover);
}

.abstract-content {
  margin-top: 0.6rem;
  padding: 0.4rem 0 0.4rem 1rem;
  border-left: 2px solid var(--rule);
  color: var(--text);
  font-size: 0.97rem;
  line-height: 1.55;
}

.abstract-content p:first-child { margin-top: 0; }
.abstract-content p:last-child { margin-bottom: 0; }

/* ---------- projects ---------- */

.project {
  padding: 1.1rem 0;
  border-bottom: 1px solid var(--rule);
}

.project:last-child { border-bottom: 0; }

.project-title {
  font-weight: 600;
  margin: 0 0 0.3rem;
  font-size: 1.05rem;
}

.project-desc {
  margin: 0 0 0.5rem;
  color: var(--text);
}

.project-tags {
  margin: 0 0 0.4rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.project-tag {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.72rem;
  color: var(--text-muted);
  background: var(--code-bg);
  padding: 0.12rem 0.45rem;
  border-radius: 3px;
}

.project-status,
.publication-status {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 0.12rem 0.5rem;
  border-radius: 3px;
  margin-left: 0.5rem;
  vertical-align: middle;
  font-weight: 500;
  white-space: nowrap;
}

.status-active       { background: #d8e8d8; color: #3a5a3a; }
.status-wip          { background: #f0e6cf; color: #6b5a2a; }
.status-archived     { background: var(--code-bg); color: var(--text-muted); }
.status-accepted     { background: #d8e8d8; color: #3a5a3a; }
.status-preprint     { background: #dfe6ef; color: #2f4863; }
.status-under-review { background: #f0e6cf; color: #6b5a2a; }

@media (prefers-color-scheme: dark) {
  .status-active       { background: #2a3a2a; color: #a8c8a8; }
  .status-wip          { background: #3a3220; color: #c9b899; }
  .status-archived     { background: var(--code-bg); color: var(--text-muted); }
  .status-accepted     { background: #2a3a2a; color: #a8c8a8; }
  .status-preprint     { background: #243140; color: #9bb6d4; }
  .status-under-review { background: #3a3220; color: #c9b899; }
}

.project-links a {
  font-size: 0.9rem;
  margin-right: 0.8rem;
}

.project-links a:last-child { margin-right: 0; }

/* ---------- math ---------- */

mjx-container[display="true"] {
  margin: 1.2rem 0 !important;
  overflow-x: auto;
  overflow-y: hidden;
}

/* ---------- small screens ---------- */

@media (max-width: 540px) {
  html { font-size: 17px; }
  .site-header-inner { flex-direction: column; align-items: flex-start; gap: 0.6rem; padding: 1.2rem; }
  .site-nav { gap: 1rem; flex-wrap: wrap; }
  .site-main { padding: 2rem 1.2rem 3rem; }
  h1 { font-size: 1.75rem; }
  .intro h1 { font-size: 1.9rem; }
  .post-title { font-size: 1.7rem; }
}