:root {
  --background: #f5f5f1;
  --foreground: #252924;
  --muted: #5e665e;
  --line: #d0d5ca;
  --accent: #a43820;
  --surface: #e9ece4;
  --font-sans: Arial, Helvetica, sans-serif;
  --font-mono: "Courier New", monospace;
  color-scheme: light;
}

:root[data-theme="dark"] {
  --background: #171c19;
  --foreground: #eceee4;
  --muted: #aeb8ac;
  --line: #3d493e;
  --accent: #ff9473;
  --surface: #242e26;
  color-scheme: dark;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 82px;
}

body {
  margin: 0;
  background: var(--background);
  color: var(--foreground);
  font: 16px/1.55 var(--font-sans);
  -webkit-font-smoothing: antialiased;
}

::selection {
  background: var(--accent);
  color: var(--background);
}

a {
  color: inherit;
  text-decoration: none;
  touch-action: manipulation;
}

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

button {
  font: inherit;
  cursor: pointer;
  touch-action: manipulation;
}

:is(a:focus-visible, button:focus-visible) {
  outline: 2px solid var(--accent);
  outline-offset: 5px;
}

h1,
h2,
h3,
p,
figure,
blockquote {
  margin: 0;
}

h1,
h2,
h3 {
  font-style: normal;
  line-height: 1.3;
}

h2 {
  font-size: 23px;
  font-weight: 600;
  letter-spacing: -0.025em;
}

h3 {
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.mono {
  font: 12px/1.55 var(--font-mono);
  letter-spacing: 0.015em;
}

.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;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: -80px;
  left: 20px;
  padding: 12px 20px;
  background: var(--foreground);
  color: var(--background);
}

.skip-link:focus {
  top: 10px;
}

/* Header ----------------------------------------------------- */
.site-header {
  position: sticky;
  z-index: 20;
  top: 0;
  display: flex;
  align-items: center;
  gap: 15px;
  min-height: 60px;
  padding: 0 max(28px, 50% - 590px);
  background: var(--background);
  border-bottom: 1px solid var(--line);
}

.wordmark {
  position: relative;
  padding-right: 8px;
  font-size: 23px;
  font-weight: 700;
  letter-spacing: -2px;
}

.wordmark span {
  font: inherit;
}

.wordmark i {
  position: absolute;
  top: 8px;
  right: 0;
  width: 4px;
  height: 4px;
  background: var(--accent);
  border-radius: 50%;
}

.site-header nav {
  display: flex;
  gap: 22px;
  margin-left: auto;
  font-size: 14px;
}

.site-header nav a {
  position: relative;
  padding: 19px 0;
}

.site-header nav a[aria-current="location"] {
  color: var(--accent);
}

.site-header nav a[aria-current="location"]::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 9px;
  left: 0;
  height: 2px;
  background: var(--accent);
}

.theme-control {
  display: flex;
  align-items: center;
  gap: 7px;
  margin-left: 4px;
  padding-left: 16px;
  border-left: 1px solid var(--line);
}

.theme-symbol {
  font-size: 22px;
}

.theme-switch {
  position: relative;
  display: inline-flex;
  flex-shrink: 0;
  align-items: center;
  width: 32px;
  height: 19px;
  padding: 0;
  background: var(--line);
  border: 0;
  border-radius: 999px;
  transition: background-color 0.2s ease;
}

.theme-switch[data-checked] {
  background: var(--accent);
}

.theme-switch [data-slot="switch-thumb"] {
  display: block;
  width: 15px;
  height: 15px;
  background: var(--background);
  border-radius: 999px;
  transform: translateX(2px);
  transition: transform 0.2s ease, background-color 0.2s ease;
}

.theme-switch[data-checked] [data-slot="switch-thumb"] {
  transform: translateX(15px);
}

.theme-switch:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 5px;
}

/* Shared layout ---------------------------------------------- */
main {
  width: min(1180px, 100% - 56px);
  margin: auto;
}

section {
  min-width: 0;
}

.section-heading,
.experience-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 16px;
}

.text-link span {
  margin-left: 8px;
  color: var(--accent);
}

/* About ------------------------------------------------------ */
.overview {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 260px;
  align-items: start;
  gap: 48px;
  padding: 32px 0 28px;
}

.profile-summary h1 {
  font-size: 40px;
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.045em;
}

.tagline {
  margin: 6px 0 16px;
  color: var(--accent);
  font-size: 16px;
}

.bio {
  max-width: 820px;
  font-size: 16px;
  line-height: 1.65;
}

.profile-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 24px;
  margin-top: 18px;
  font-size: 14px;
  font-weight: 600;
}

.profile-links a {
  display: flex;
  align-items: center;
  gap: 9px;
}

.profile-links a span {
  color: var(--accent);
}

.profile-emails {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  margin-top: 10px;
  color: var(--muted);
  font-size: 14px;
}

.profile-emails a {
  overflow-wrap: anywhere;
}

.observation {
  position: relative;
  min-height: 292px;
  padding-bottom: 32px;
}

.observer-image {
  position: relative;
  width: 182px;
  height: 238px;
  margin-left: auto;
  transform: translate(var(--look-x, 0), var(--look-y, 0));
  transition: transform 0.8s cubic-bezier(0.18, 0.65, 0.24, 1);
}

.observer-image picture {
  display: block;
  width: 100%;
  height: 100%;
  overflow: hidden;
}

.observer-image img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.65);
  transform: scale(1.035) translate(calc(var(--look-x, 0) * -0.5), calc(var(--look-y, 0) * -0.5));
  transition: transform 0.9s;
}

.frame-corner {
  position: absolute;
  width: 13px;
  height: 13px;
  border-color: var(--accent);
  border-style: solid;
}

.frame-corner.tl {
  top: -4px;
  left: -4px;
  border-width: 1px 0 0 1px;
}

.frame-corner.br {
  right: -4px;
  bottom: -4px;
  border-width: 0 1px 1px 0;
}

.observation blockquote {
  position: relative;
  z-index: 1;
  max-width: 230px;
  margin-top: -40px;
  padding: 9px 12px 4px 0;
  background: var(--background);
  font-size: 14px;
  font-style: normal;
  font-weight: 400;
  line-height: 1.5;
}

.observation blockquote::before {
  content: "“";
  position: absolute;
  top: 1px;
  left: -14px;
  color: var(--accent);
  font-size: 27px;
}

/* Publications ---------------------------------------------- */
.publications,
.education,
.experience,
.projects {
  padding: 24px 0 28px;
  border-top: 1px solid var(--line);
}

.publication {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  padding: 17px 0;
  border-top: 1px solid var(--line);
}

.publication::before,
.experience-list article::before,
.projects-list article::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--accent);
  transition: width 0.3s ease;
}

.publication:hover::before,
.publication:focus-within::before,
.experience-list article:hover::before,
.experience-list article:focus-within::before,
.projects-list article:hover::before,
.projects-list article:focus-within::before {
  width: 100%;
}

.publication h3 {
  font-size: 18px;
  line-height: 1.4;
}

.authors {
  margin-top: 6px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.5;
}

.authors strong {
  color: var(--foreground);
  font-weight: 600;
}

.publication-meta {
  margin-top: 4px;
}

.publication-meta p {
  margin: 5px 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.5;
}

.publication-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 16px;
}

.status {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 13px;
  font-weight: 600;
}

.status i {
  width: 5px;
  height: 5px;
  background: var(--foreground);
  border-radius: 50%;
}

.status.under-review {
  color: var(--accent);
}

.status.under-review i {
  background: transparent;
  border: 1px solid var(--accent);
}

.paper-link {
  font-size: 13px;
}

.paper-link > span[aria-hidden="true"] {
  margin-left: 7px;
  color: var(--accent);
}

.paper-unavailable {
  color: var(--muted);
  font-size: 12px;
}

/* Education -------------------------------------------------- */
.education-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 28px;
}

.education-list article {
  transition: border-color 0.3s ease;
}

.education-list article + article {
  padding-left: 24px;
  border-left: 1px solid var(--line);
}

.education-list article:hover,
.education-list article:focus-within {
  border-color: var(--accent);
}

.degree-date {
  display: flex;
  justify-content: space-between;
  margin-bottom: 7px;
  color: var(--muted);
}

.education h3 {
  margin-bottom: 6px;
  font-size: 17px;
}

.education p {
  margin: 4px 0;
  font-size: 14px;
  line-height: 1.6;
}

.education .institution {
  color: var(--accent);
  font-weight: 400;
}

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

/* Experience ------------------------------------------------- */
.experience-list article {
  position: relative;
  display: grid;
  grid-template-columns: 148px minmax(0, 1fr);
  gap: 18px;
  padding: 17px 0;
  border-top: 1px solid var(--line);
}

.experience-date {
  padding-top: 2px;
  color: var(--muted);
}

.experience-detail {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  align-content: start;
  column-gap: 28px;
}

.experience-detail h3 {
  grid-area: 1 / 1;
  font-size: 17px;
}

.organization {
  grid-area: 2 / 1;
  margin-top: 5px;
  color: var(--accent);
  font-size: 14px;
  line-height: 1.5;
}

.experience-detail ul {
  grid-area: 1 / 2 / span 3;
  margin: 0;
  padding: 0;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.5;
  list-style: none;
}

.experience-detail li {
  position: relative;
  margin-bottom: 5px;
  padding-left: 13px;
}

.experience-detail li::before {
  content: "–";
  position: absolute;
  left: 0;
}

.experience-index {
  display: none;
}

.inline-course-link {
  color: var(--foreground);
  border-bottom: 1px solid var(--line);
  transition: color 0.2s ease, border-color 0.2s ease;
}

.inline-course-link:hover,
.inline-course-link:focus-visible {
  color: var(--accent);
  border-color: var(--accent);
}

/* Projects --------------------------------------------------- */
.projects-list article {
  position: relative;
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
  gap: 32px;
  padding: 17px 0;
  border-top: 1px solid var(--line);
}

.project-title h3 {
  margin-top: 6px;
  font-size: 20px;
}

.project-description p {
  margin-bottom: 8px;
  font-size: 16px;
  line-height: 1.55;
}

.text-link {
  padding-bottom: 2px;
  font-size: 14px;
  border-bottom: 1px solid var(--line);
}

/* Footer ----------------------------------------------------- */
.site-footer {
  display: flex;
  align-items: flex-end;
  justify-content: flex-end;
  gap: 20px;
  margin-top: 0;
  padding: 16px 0;
  color: var(--muted);
  font-size: 13px;
  border-top: 1px solid var(--line);
}

.back-top {
  color: var(--muted);
  font-size: 12px;
}

/* Responsive ------------------------------------------------- */
@media (max-width: 1100px) {
  .site-header nav {
    gap: 18px;
  }

  .overview {
    grid-template-columns: minmax(0, 1fr) 220px;
    gap: 35px;
  }

  .observation blockquote {
    max-width: 210px;
  }

  .experience-list article {
    grid-template-columns: 125px minmax(0, 1fr);
    gap: 16px;
  }

  .experience-detail {
    grid-template-columns: 210px minmax(0, 1fr);
    column-gap: 22px;
  }
}

@media (max-width: 820px) {
  .site-header {
    gap: 12px;
    padding: 0 22px;
  }

  .site-header nav {
    gap: 14px;
    font-size: 13px;
  }

  .theme-control {
    margin-left: 0;
    padding-left: 10px;
  }

  main {
    width: calc(100% - 44px);
  }

  .overview {
    grid-template-columns: minmax(0, 1fr) 180px;
    gap: 28px;
    padding-top: 26px;
  }

  .profile-summary h1 {
    font-size: 34px;
  }

  .tagline {
    font-size: 15px;
  }

  .observer-image {
    width: 154px;
    height: 204px;
  }

  .observation {
    min-height: 287px;
  }

  .observation blockquote {
    max-width: 180px;
    margin-top: -18px;
    font-size: 13px;
  }

  .profile-links {
    gap: 9px 18px;
  }

  .publication h3 {
    font-size: 17px;
  }

  .experience-list article {
    grid-template-columns: 130px minmax(0, 1fr);
  }

  .experience-detail {
    display: block;
  }

  .organization {
    margin: 4px 0 8px;
  }

  .education-list {
    gap: 18px;
  }

  .education-list article + article {
    padding-left: 18px;
  }

  .projects-list article {
    grid-template-columns: 160px minmax(0, 1fr);
    gap: 25px;
  }
}

@media (max-width: 620px) {
  html {
    scroll-padding-top: 111px;
  }

  .site-header {
    display: grid;
    grid-template-rows: 40px auto;
    grid-template-columns: 1fr auto;
    gap: 0;
    min-height: 92px;
    padding: 0 18px 5px;
  }

  .wordmark {
    justify-self: start;
    font-size: 21px;
  }

  .theme-control {
    grid-area: 1 / 2;
    padding: 0;
    border: 0;
  }

  .site-header nav {
    grid-area: 2 / 1 / auto / -1;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0 12px;
    margin: 0;
    font-size: 13px;
  }

  .site-header nav a {
    justify-self: start;
    min-height: 29px;
    padding: 5px 0;
  }

  .site-header nav a[aria-current="location"]::after {
    bottom: 0;
  }

  main {
    width: calc(100% - 36px);
  }

  .overview {
    display: block;
    padding: 23px 0 20px;
  }

  .profile-summary h1 {
    font-size: 32px;
  }

  .tagline {
    margin-bottom: 12px;
    font-size: 15px;
  }

  .bio {
    font-size: 16px;
    line-height: 1.6;
  }

  .profile-links {
    gap: 9px 20px;
    margin-top: 13px;
  }

  .profile-emails {
    gap: 4px 18px;
    margin-top: 8px;
  }

  .observation {
    display: grid;
    grid-template-columns: 116px minmax(0, 1fr);
    align-items: center;
    gap: 18px;
    min-height: 155px;
    margin-top: 22px;
    padding: 0;
  }

  .observer-image {
    grid-area: 1 / 1 / span 2;
    width: 112px;
    height: 147px;
    margin: 0;
  }

  .observation blockquote {
    position: static;
    grid-area: 1 / 2;
    align-self: end;
    max-width: none;
    margin: 0 0 0 1px;
    padding: 0;
    background: transparent;
    font-size: 14px;
    line-height: 1.5;
  }

  .observation blockquote::before {
    display: none;
  }

  .section-heading,
  .experience-heading {
    margin-bottom: 12px;
  }

  h2 {
    font-size: 22px;
  }

  .publications,
  .education,
  .experience,
  .projects {
    padding: 20px 0;
  }

  .publication {
    padding: 15px 0;
  }

  .publication h3 {
    font-size: 17px;
    line-height: 1.4;
  }

  .authors {
    margin-top: 5px;
    font-size: 13px;
  }

  .status,
  .paper-link {
    font-size: 13px;
  }

  .paper-unavailable {
    font-size: 12px;
  }

  .education-list {
    display: block;
  }

  .education-list article,
  .education-list article + article {
    padding: 13px 0;
    border: 0;
    border-top: 1px solid var(--line);
  }

  .degree-date {
    margin-bottom: 4px;
  }

  .education h3 {
    margin-bottom: 3px;
    font-size: 17px;
  }

  .experience-list article {
    display: block;
    padding: 14px 0;
  }

  .experience-date {
    margin-bottom: 5px;
    font-size: 12px;
  }

  .experience-detail h3 {
    font-size: 17px;
  }

  .experience-detail ul {
    font-size: 16px;
    line-height: 1.5;
  }

  .experience-detail li {
    margin-bottom: 4px;
  }

  .projects-list article {
    display: block;
  }

  .project-title h3 {
    margin: 3px 0 9px;
    font-size: 19px;
  }

  .project-description p {
    font-size: 16px;
  }

  .site-footer {
    flex-direction: column;
    gap: 6px;
  }
}

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

  *,
  *::before,
  *::after {
    transition: none !important;
    animation: none !important;
  }

  .observer-image,
  .observer-image img {
    transform: none !important;
  }
}

@media print {
  .site-header,
  .back-top {
    display: none;
  }

  main {
    width: 100%;
  }

  body {
    --background: white;
    --foreground: black;
    --muted: #444;
    --line: #aaa;
    --accent: #803920;
  }

  .publication,
  .experience-list article,
  .education-list article {
    break-inside: avoid;
  }
}