/* ==========================================================================
   Warm, airy academic theme: cream/beige background, sage accent,
   all-sans typography. Inspired by minimal academic portfolio sites —
   generous whitespace, quiet dividers instead of heavy boxes.
   ========================================================================== */

:root {
  --color-text: #2b2823;
  --color-text-muted: #675e4e;
  --color-accent: #4f7942;
  --color-accent-dark: #3c5c32;
  --color-bg: #faf5ec;
  --color-bg-alt: #f1e8d8;
  --color-card: #fffcf6;
  --color-border: #e4d9c4;
  --max-width: 46rem;
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  --font-heading: "Lora", Georgia, "Times New Roman", serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-text: #ede6d8;
    --color-text-muted: #c2b89f;
    --color-accent: #8fc17e;
    --color-accent-dark: #a9d69a;
    --color-bg: #211f1a;
    --color-bg-alt: #2b2822;
    --color-card: #2b2822;
    --color-border: #3d392f;
  }
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  overflow-x: hidden;
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--color-accent-dark);
  text-decoration: none;
}

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

h2 {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--color-accent-dark);
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 0.6rem;
  margin: 0 0 1.5rem;
}

h2.section-headline {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 600;
  text-transform: none;
  letter-spacing: -0.01em;
  color: var(--color-text);
  border-bottom: none;
  padding-bottom: 0;
  margin: 0 0 1.75rem;
}

.subsection {
  margin-bottom: 2.25rem;
  scroll-margin-top: 4.5rem;
}

.subsection:last-child {
  margin-bottom: 0;
}

.subsection h3 {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--color-accent-dark);
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 0.6rem;
  margin: 0 0 1.25rem;
}

img {
  max-width: 100%;
}

/* --- Header / nav ------------------------------------------------------- */

.site-header {
  position: sticky;
  top: 0;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  z-index: 10;
}

.site-nav {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0.9rem 1.25rem;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
}

.nav-name {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1.15rem;
  letter-spacing: 0.01em;
  color: var(--color-text);
  margin-right: auto;
}

.nav-name:hover {
  text-decoration: none;
  color: var(--color-accent-dark);
}

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  color: var(--color-text);
  font-size: 1.1rem;
  padding: 0.15rem 0.5rem;
  cursor: pointer;
}

.nav-links {
  list-style: none;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.25rem 1.5rem;
  margin: 0;
  padding: 0;
}

.nav-links a {
  color: var(--color-text-muted);
  font-size: 0.92rem;
  font-weight: 500;
}

.nav-links a:hover {
  color: var(--color-accent-dark);
  text-decoration: none;
}

.nav-links a[aria-current="page"] {
  color: var(--color-accent-dark);
}

@media (max-width: 700px) {
  .nav-toggle {
    display: block;
  }

  .nav-links {
    display: none;
    flex-basis: 100%;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
    padding: 0.5rem 0;
  }

  .site-nav.nav-open .nav-links {
    display: flex;
  }
}

/* --- Layout ------------------------------------------------------------- */

main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 3rem 1.25rem 4rem;
}

.main-about {
  min-height: calc(100vh - 8rem);
  display: flex;
  flex-direction: column;
  align-items: center;
  padding-top: 4rem;
  padding-bottom: 0;
}

.main-about #about {
  margin-bottom: 0;
  width: 100%;
}

.section {
  margin-bottom: 3.5rem;
  scroll-margin-top: 4.5rem;
}

/* --- Profile ------------------------------------------------------------ */

.profile {
  display: flex;
  gap: 2rem;
  align-items: flex-start;
  flex-wrap: wrap;
}

.profile-photo {
  width: 168px;
  height: 168px;
  object-fit: cover;
  border-radius: 50%;
  flex-shrink: 0;
  border: 1px solid var(--color-border);
}

.profile-body {
  flex: 1;
  min-width: 15rem;
}

.profile-body h1 {
  font-family: var(--font-heading);
  margin: 0 0 0.35rem;
  font-size: 2.2rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.profile-role {
  color: var(--color-accent-dark);
  font-weight: 700;
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin: 0 0 1.1rem;
}

.profile-bio {
  color: var(--color-text);
}

.profile-links {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.25rem;
  margin: 1rem 0 0;
  padding: 0;
}

.profile-links a {
  color: var(--color-accent-dark);
  font-weight: 500;
}

/* --- About page: divider + Latest Publications ---------------------------- */

.about-subsection {
  margin-top: 3rem;
}

.scenery-divider {
  margin: 3rem 0;
  border-radius: 10px;
  overflow: hidden;
  border: 1px solid var(--color-border);
}

.scenery-divider-img {
  display: block;
  width: 100%;
  height: 220px;
  object-fit: cover;
}

@media (max-width: 500px) {
  .scenery-divider-img {
    height: 150px;
  }
}

/* --- Research page: small circular accent photos beside headings ---------- */
/* Sits next to the heading only (never beside body text), so list/card
   alignment below is never affected. */

.section-heading-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.section-heading-row h2 {
  margin-bottom: 0;
}

.section-heading-row {
  margin-bottom: 1.5rem;
}

.accent-photo-circle img {
  display: block;
  width: 6.5rem;
  height: 6.5rem;
  object-fit: cover;
  border-radius: 50%;
  border: 1px solid var(--color-border);
}

/* --- Research page: in-page sub-nav ---------------------------------------- */

.page-subnav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
  margin: -0.75rem 0 2.25rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--color-border);
}

.page-subnav a {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-text-muted);
}

.page-subnav a:hover {
  color: var(--color-accent-dark);
  text-decoration: none;
}

/* --- Conference presentations & awards: photo grid -------------------------- */
/* Uniform grid, square cells via aspect-ratio + object-fit: cover — every row
   and column edge lines up, regardless of each photo's original dimensions. */

.presentations-collage {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
}

.presentations-collage img {
  display: block;
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  object-position: top;
  border-radius: 8px;
  border: 1px solid var(--color-border);
}

@media (min-width: 480px) {
  .presentations-collage {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 700px) {
  .presentations-collage {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* --- News ---------------------------------------------------------------- */

.news-year h3 {
  margin: 1.25rem 0 0.6rem;
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
}

.news-year:first-child h3 {
  margin-top: 0;
}

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

.news-list li {
  margin-bottom: 0.7rem;
  padding-left: 0.25rem;
}

.news-type {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--color-accent-dark);
  margin-right: 0.4rem;
}

/* --- Papers (publications + working papers) ------------------------------ */

.paper {
  display: flex;
  gap: 1.25rem;
  align-items: flex-start;
  padding: 1.15rem 0;
  border-bottom: 1px solid var(--color-border);
}

.paper:last-child {
  border-bottom: none;
}

.paper-thumb {
  width: 96px;
  height: 96px;
  object-fit: cover;
  border-radius: 8px;
  flex-shrink: 0;
  border: 1px solid var(--color-border);
}

.paper-body {
  flex: 1;
  min-width: 0;
}

@media (max-width: 500px) {
  .paper {
    flex-direction: column;
  }

  .paper-thumb {
    width: 100%;
    height: auto;
    max-height: 180px;
  }
}

.paper-title {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1.12rem;
  margin: 0 0 0.25rem;
}

.paper-authors {
  margin: 0 0 0.15rem;
  font-size: 0.95rem;
  color: var(--color-text);
}

.paper-venue {
  margin: 0;
  font-size: 0.9rem;
  font-style: italic;
  color: var(--color-text-muted);
}

.paper-links {
  margin: 0.5rem 0 0;
  font-size: 0.88rem;
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.paper-links a {
  color: var(--color-accent-dark);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-size: 0.78rem;
}

/* --- Generic item lists (talks, software, projects, teaching) ------------ */

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

.item:last-child {
  border-bottom: none;
}

.item-title {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1.12rem;
  margin: 0;
}

.item-meta {
  margin: 0.15rem 0 0;
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

.item-description {
  margin: 0.35rem 0 0;
  font-size: 0.95rem;
}

/* --- Footer --------------------------------------------------------------- */

.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 1.5rem 1rem;
  text-align: center;
  font-size: 0.82rem;
  color: var(--color-text-muted);
}