/* ───────────────────────────────────────────────────────────────
   Fonts: Libertinus Serif, stored in assets/fonts (SIL Open Font License)
   ─────────────────────────────────────────────────────────────── */
@font-face {
  font-family: "Libertinus Serif";
  src: url("fonts/libertinus-serif-regular.woff2") format("woff2");
  font-weight: 400; font-style: normal; font-display: swap;
}
@font-face {
  font-family: "Libertinus Serif";
  src: url("fonts/libertinus-serif-italic.woff2") format("woff2");
  font-weight: 400; font-style: italic; font-display: swap;
}
@font-face {
  font-family: "Libertinus Serif";
  src: url("fonts/libertinus-serif-semibold.woff2") format("woff2");
  font-weight: 600; font-style: normal; font-display: swap;
}

/* ───────────────────────────────────────────────────────────────
   Colors. Light is the default; dark applies after the toggle.
   ─────────────────────────────────────────────────────────────── */
:root {
  --background: #ffffff;
  --text: #000000;
  --text-soft: #4d4d4d;   /* coauthors, status */
  --title: #339987;       /* name and big headings: the icon's green, a touch deeper */
  --accent: #2a7e70;      /* links and small headings: deeper still, for readability */
  --rule: #cfe3de;        /* thin lines */
  color-scheme: light;
}
:root[data-theme="dark"] {
  --background: #12362f;  /* dark version of the icon's green */
  --text: #ffffff;
  --text-soft: #c5dcd6;
  --title: #9ce2d6;
  --accent: #9ce2d6;
  --rule: #2c5d54;
  color-scheme: dark;
}

/* ───────────────────────────────────────────────────────────────
   Base
   ─────────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; }

html {
  font-size: 112.5%;               
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}
@media (min-width: 40em) {
  html { font-size: 118.75%; }        
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

body {
  margin: 0;
  background: var(--background);
  color: var(--text);
  font-family: "Libertinus Serif", "Linux Libertine O", "Linux Libertine", Georgia, "Times New Roman", serif;
  font-variant-numeric: lining-nums proportional-nums;
  line-height: 1.6;
  text-rendering: optimizeLegibility;
}

a {
  color: inherit;
  text-decoration-line: underline;
  text-decoration-color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}
@media (hover: hover) {
  a:hover { text-decoration-thickness: 2px; }
}

:focus-visible {
  outline: 2px solid currentColor;
  outline-offset: 3px;
  border-radius: 2px;
}

.page {
  max-width: 36rem;                 /* about 75 characters per line */
  margin: 0 auto;
  padding: 3.5rem 1.25rem 5rem;
}

/* ───────────────────────────────────────────────────────────────
   Top: name, links, photo, details (all centered)
   ─────────────────────────────────────────────────────────────── */
.site-header { text-align: center; }

.site-name {
  margin: 0;
  font-size: clamp(1.7rem, 10.5vw, 2.2rem);   /* shrinks slightly on small phones */
  font-weight: 400;
  line-height: 1.15;
  letter-spacing: 0.005em;
  text-wrap: balance;
}
.site-name { color: var(--title); }
.site-name a { text-decoration: none; }

.site-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  list-style: none;
  margin: 0.5rem 0 0;
  padding: 0;
  font-size: 1.05rem;
}
.site-nav a { color: var(--accent); }
.site-nav li + li::before {
  content: "\00B7";          /* middle dot */
  margin: 0 0.5em;
  color: var(--accent);
  font-weight: 600;
}

.profile {
  margin-top: 2.25rem;
  text-align: center;
}
.photo {
  display: block;
  width: 9rem;
  height: 9rem;
  margin: 0 auto;
  border-radius: 50%;
  object-fit: cover;
}
.details {
  margin: 1.1rem 0 0;
  line-height: 1.45;
}
.details span {
  display: block;
  text-wrap: balance;
}

/* ───────────────────────────────────────────────────────────────
   Content (left aligned)
   ─────────────────────────────────────────────────────────────── */
.bio {
  margin-top: 2.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--rule);
}
.bio p { margin: 0 0 1em; }
.bio p:last-child { margin-bottom: 0; }

/* Thin line above the bio, the papers and teaching */
.research,
.teaching {
  margin-top: 2.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--rule);
  scroll-margin-top: 1rem;
}
.research > .section-title:first-child,
.teaching > .section-title:first-child { margin-top: 0; }

/* Working papers, Work in progress, Teaching */
.section-title {
  margin: 2.4rem 0 1rem;
  color: var(--title);
  font-size: 1.5rem;
  font-weight: 400;
  line-height: 1.2;
}

/* Papers, numbered 1, 2, 3… across all groups */
.research { counter-reset: paper; }
.paper {
  position: relative;
  margin: 0 0 1.6rem;
  padding-left: 1.75em;
  counter-increment: paper;
}
.paper:last-child { margin-bottom: 0; }
.paper::before {
  content: counter(paper) ".";
  position: absolute;
  left: 0;
  top: 0;
  color: var(--accent);
  font-size: 1.05rem;
  font-weight: 600;
  line-height: 1.35;
}

.paper-title {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 600;
  line-height: 1.35;
  text-wrap: pretty;
}
.paper-coauthors,
.paper-status {
  margin: 0.15rem 0 0;
  color: var(--text-soft);
}
.paper-status { font-style: italic; }

.paper-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin: 0.5rem 0 0;
}

/* Buttons under each paper (abstract, pdf, slides…): all the same,
   rounded border, filled with green on hover */
.button {
  display: inline-block;
  padding: 0.08em 0.8em 0.14em;
  border: 1px solid var(--accent);
  border-radius: 999px;
  background: transparent;
  color: var(--accent);
  font: inherit;
  font-size: 0.85rem;
  line-height: 1.5;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.15s ease, color 0.15s ease;
}
@media (hover: hover) {
  .button:hover {
    background: var(--accent);
    color: var(--background);
  }
}
@media (prefers-reduced-motion: reduce) {
  .button { transition: none; }
}

/* The abstract button only appears when JavaScript runs,
   and stays filled while its abstract is open */
.abstract-toggle { display: none; }
.js .abstract-toggle { display: inline-block; }
.abstract-toggle[aria-expanded="true"] {
  background: var(--accent);
  color: var(--background);
}

.abstract {
  margin-top: 0.7rem;
  padding-left: 1rem;
  border-left: 2px solid var(--rule);
  font-size: 0.95rem;
  hyphens: auto;
  -webkit-hyphens: auto;
}
@media (min-width: 40em) {
  .abstract { text-align: justify; }   /* phones keep left alignment: justified
                                          narrow columns open large gaps */
}
.abstract p { margin: 0; }
.js .abstract { display: none; }
.js .abstract.is-open { display: block; }

/* Teaching */
.teaching h3 {
  margin: 1.5rem 0 0.4rem;
  color: var(--accent);
  font-size: 1.1rem;
  font-weight: 400;
  font-style: italic;
}
.teaching h2 + h3 { margin-top: 0; }
.teaching ul {
  margin: 0;
  padding-left: 1.1rem;
}
.teaching li { margin: 0.15rem 0; }
.teaching li::marker { color: var(--accent); }

/* ───────────────────────────────────────────────────────────────
   Dark mode button (top right)
   ─────────────────────────────────────────────────────────────── */
.theme-toggle {
  display: none;                    /* only shown when JavaScript runs */
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
  width: 2.25rem;
  height: 2.25rem;
  padding: 0.45rem;
  border: 0;
  border-radius: 50%;
  background: none;
  color: var(--text);
  cursor: pointer;
}
.js .theme-toggle { display: block; }
@media (hover: hover) {
  .theme-toggle:hover { background: var(--rule); }
}
.icon {
  width: 100%;
  height: 100%;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.6;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.icon-sun { display: none; }
:root[data-theme="dark"] .icon-moon { display: none; }
:root[data-theme="dark"] .icon-sun { display: block; }