/* =============================================================================
   abhaysobhanan.github.io

   One serif family (Source Serif 4) on warm paper, with petrol-ink links.
   Layout: a single text column with a left margin. Section headings,
   the portrait and lab photos hang in that margin, as in a typeset book.
   ========================================================================== */

/* Source Serif 4 (SIL Open Font License, see assets/fonts/OFL.txt),
   self-hosted variable font with weight and optical-size axes. */
@font-face {
  font-family: "Source Serif 4";
  font-style: normal;
  font-weight: 200 900;
  font-display: swap;
  src: url("../fonts/source-serif-4-latin-standard-normal.woff2") format("woff2");
  unicode-range: U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD;
}
@font-face {
  font-family: "Source Serif 4";
  font-style: normal;
  font-weight: 200 900;
  font-display: swap;
  src: url("../fonts/source-serif-4-latin-ext-standard-normal.woff2") format("woff2");
  unicode-range: U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF;
}
@font-face {
  font-family: "Source Serif 4";
  font-style: italic;
  font-weight: 200 900;
  font-display: swap;
  src: url("../fonts/source-serif-4-latin-standard-italic.woff2") format("woff2");
  unicode-range: U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD;
}
@font-face {
  font-family: "Source Serif 4";
  font-style: italic;
  font-weight: 200 900;
  font-display: swap;
  src: url("../fonts/source-serif-4-latin-ext-standard-italic.woff2") format("woff2");
  unicode-range: U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF;
}

:root {
  --paper: #fbfaf7;
  --ink: #1e2226;
  --graphite: #5b6066;
  --faint: #8a8e93;
  --rule: #e2dfd8;
  --accent: #1c5866;
  --accent-wash: #dde9ea;

  --margin: 11rem;     /* width of the hanging margin */
  --gutter: 2.75rem;   /* space between margin and text */
  --measure: 41rem;    /* text column width */

  --serif: "Source Serif 4", Charter, "Bitstream Charter",
           Cambria, Georgia, serif;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #16191c;
    --ink: #e4e1da;
    --graphite: #a3a7ac;
    --faint: #7d8187;
    --rule: #2d3236;
    --accent: #84bcc6;
    --accent-wash: #22383d;
    color-scheme: dark;
  }
}

/* ---------- base ---------- */

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

html {
  font-size: 100%;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 1.1875rem;
  line-height: 1.6;
  font-optical-sizing: auto;
  font-variant-numeric: oldstyle-nums proportional-nums;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img { max-width: 100%; height: auto; display: block; }

p, ul, ol, dl, blockquote { margin: 0 0 1em; }
p, li { text-wrap: pretty; }

a {
  color: var(--accent);
  text-decoration-line: underline;
  text-decoration-thickness: 1px;
  text-decoration-color: color-mix(in srgb, var(--accent) 45%, transparent);
  text-underline-offset: 0.18em;
}
a:hover { text-decoration-color: currentColor; text-decoration-thickness: 1.5px; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 2px;
}

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

h1, h2, h3, h4 {
  font-weight: 600;
  line-height: 1.2;
  margin: 0;
  text-wrap: balance;
  font-variant-numeric: lining-nums;
}

h1 { font-size: 2.25rem; letter-spacing: -0.012em; line-height: 1.12; }
h2 { font-size: 1.1875rem; line-height: 1.6; }
h3 { font-size: 1.1875rem; line-height: 1.4; }

em, cite { font-style: italic; }
cite { font-style: italic; }
strong { font-weight: 650; }

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

.skip {
  position: absolute;
  left: -999px;
  top: 0.5rem;
  background: var(--paper);
  padding: 0.25rem 0.5rem;
}
.skip:focus { left: 0.5rem; z-index: 10; }

/* ---------- frame ----------
   .frame centres the page. .col is the text column; anything with .hang
   (and every h2 inside .col) floats out into the left margin. */

.frame {
  max-width: calc(var(--margin) + var(--gutter) + var(--measure) + 3rem);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.col {
  margin-left: calc(var(--margin) + var(--gutter));
  max-width: var(--measure);
}

.col h2,
.hang {
  float: left;
  clear: left;
  width: var(--margin);
  margin-left: calc(-1 * (var(--margin) + var(--gutter)));
  margin-right: var(--gutter);
}

.col h2 { margin-top: 0; }

.section { clear: left; margin-top: 3.5rem; }
.page-head + .col > .section:first-child { margin-top: 0; }
.intro + .col { margin-top: 4rem; }
.section::after { content: ""; display: table; clear: left; }

/* ---------- header ---------- */

.site-header { padding: 2.25rem 0 0; }

.site-header .frame {
  display: grid;
  grid-template-columns: var(--margin) minmax(0, var(--measure));
  column-gap: var(--gutter);
  align-items: baseline;
}

.site-name {
  color: var(--ink);
  font-weight: 600;
  text-decoration: none;
  font-size: 1.0625rem;
  white-space: nowrap;
}
.site-name:hover { color: var(--accent); }

.site-nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.15rem 1.35rem;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 1.0625rem;
}

.site-nav a {
  color: var(--graphite);
  text-decoration: none;
}
.site-nav a:hover { color: var(--accent); }
.site-nav a[aria-current="page"] {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.3em;
}

/* ---------- page heads ---------- */

main { padding-bottom: 5rem; }

.page-head { padding-top: 4.5rem; margin-bottom: 3rem; }
.page-head .lede { margin-top: 1rem; }

.lede {
  font-size: 1.3rem;
  line-height: 1.5;
  color: var(--ink);
}

.quiet { color: var(--graphite); }
.small { font-size: 0.875em; line-height: 1.5; }

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

.intro { padding-top: 4.5rem; }
.intro::after { content: ""; display: table; clear: left; }
.intro-body > p:first-child { font-size: 1.3rem; line-height: 1.5; }

.portrait {
  aspect-ratio: 4 / 5;
  object-fit: cover;
  object-position: 50% 30%;
  width: var(--margin);
  background: var(--rule);
}

.intro h1 {
  font-size: 3rem;
  font-weight: 600;
  letter-spacing: -0.018em;
  line-height: 1;
  margin: -0.12em 0 1.1rem;
}

.intro .lede { margin-bottom: 1.4rem; }

.profiles {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.25rem;
  list-style: none;
  padding: 0;
  margin: 1.5rem 0 0;
  font-size: 1.0625rem;
}

/* ---------- dated lists (news, talks, publications, CV) ----------
   A narrow column of dates inside the text column. */

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

.dated > li {
  display: grid;
  grid-template-columns: 5.25rem minmax(0, 1fr);
  column-gap: 1rem;
  margin: 0 0 1.1rem;
}

.dated > li > .when {
  color: var(--graphite);
  font-size: 0.875em;
  line-height: 1.6rem;
  padding-top: 0.15rem;
  font-variant-numeric: oldstyle-nums tabular-nums;
}

.dated > li > .what > :last-child { margin-bottom: 0; }

.dated.loose > li { margin-bottom: 1.75rem; }
.dated > li:last-child, .people > li:last-child { margin-bottom: 0; }
.dated.wide > li { grid-template-columns: 7.5rem minmax(0, 1fr); }
.dated.years > li { grid-template-columns: 3.25rem minmax(0, 1fr); column-gap: 1.25rem; }

.cv-what { font-weight: 600; line-height: 1.45; margin-bottom: 0.15rem; }

/* ---------- research themes ---------- */

.theme + .theme { margin-top: 2rem; }
.theme h3 { margin-bottom: 0.35rem; }
.theme p { margin-bottom: 0.6rem; }

.refs {
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 0.9375em;
  line-height: 1.5;
}
.refs li {
  padding-left: 1rem;
  text-indent: -1rem;
  margin-bottom: 0.35rem;
}
.refs li::before { content: "– "; color: var(--faint); }
.refs .venue { color: var(--graphite); }
.refs a { text-decoration-color: color-mix(in srgb, var(--accent) 28%, transparent); }
.refs a:hover { text-decoration-color: currentColor; }

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

.pub-title {
  font-weight: 600;
  line-height: 1.4;
  margin-bottom: 0.2rem;
}

.pub-meta {
  color: var(--graphite);
  font-size: 0.9375em;
  line-height: 1.5;
  margin-bottom: 0;
}
.pub-meta .me { color: var(--ink); font-weight: 600; }
.pub-meta cite { color: var(--ink); }

.pub-award {
  font-size: 0.9375em;
  line-height: 1.5;
  margin: 0.15rem 0 0;
  font-style: italic;
}

.pub-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.1rem 1.1rem;
  font-size: 0.9375em;
  margin: 0.35rem 0 0;
  padding: 0;
  list-style: none;
}

.abs-toggle {
  font: inherit;
  color: var(--accent);
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-decoration-color: color-mix(in srgb, var(--accent) 45%, transparent);
  text-underline-offset: 0.18em;
}
.abs-toggle:hover { text-decoration-color: currentColor; }
.abs-toggle::after {
  content: "";
  display: inline-block;
  width: 0.38em;
  height: 0.38em;
  margin-left: 0.4em;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: translateY(-0.2em) rotate(45deg);
}
.abs-toggle[aria-expanded="true"]::after { transform: translateY(0.05em) rotate(-135deg); }

.abstract {
  font-size: 0.9375em;
  line-height: 1.6;
  color: var(--graphite);
  margin: 0.75rem 0 0.25rem;
  padding-left: 1rem;
  border-left: 1px solid var(--rule);
  hyphens: auto;
}

.footnote {
  font-size: 0.875em;
  color: var(--graphite);
  margin-top: 2.5rem;
}

/* ---------- lab ---------- */

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

.person {
  display: grid;
  grid-template-columns: 6.5rem minmax(0, 1fr);
  column-gap: 1.5rem;
  margin-bottom: 2.25rem;
}
.person img {
  width: 6.5rem;
  aspect-ratio: 1;
  object-fit: cover;
  background: var(--rule);
  margin-top: 0.35rem;
}
.person h3 { margin-bottom: 0.1rem; }
.person .role { color: var(--graphite); font-size: 0.9375em; line-height: 1.5; margin-bottom: 0.5rem; }
.person p { margin-bottom: 0.4rem; }
.person-past { margin-bottom: 1.25rem; }

/* ---------- prose pages (Markdown) ---------- */

/* h2s float into the margin; the block before each h2 carries the
   section spacing so the heading and its first paragraph line up. */
.prose > * { margin-top: 0; }
.prose > :has(+ h2) { margin-bottom: 3rem; }
.prose h3 { margin: 1.75rem 0 0.5rem; }
.prose ul, .prose ol { padding-left: 1.2rem; }
.prose li { margin-bottom: 0.5rem; }
.prose li > ul { margin-top: 0.5rem; }
.prose blockquote {
  margin-left: 0;
  padding-left: 1rem;
  border-left: 1px solid var(--rule);
  color: var(--graphite);
}

/* ---------- footer ---------- */

.site-footer {
  border-top: 1px solid var(--rule);
  padding: 2.5rem 0 3rem;
  font-size: 0.9375rem;
  line-height: 1.55;
  color: var(--graphite);
}
.site-footer h2 { font-size: 0.9375rem; color: var(--ink); }
.site-footer address { font-style: normal; margin-bottom: 0.75rem; }
.site-footer p { margin: 0; }
.site-footer .updated { margin-top: 1.25rem; color: var(--faint); }

/* Justified paragraphs on the home page */
.intro-body > p,
.theme > p,
#together ~ p {
  text-align: justify;
  -webkit-hyphens: auto;
  hyphens: auto;
}

/* ---------- narrow screens ---------- */

@media (max-width: 54rem) {
  :root { --margin: 8.5rem; --gutter: 2rem; }
}

@media (max-width: 44rem) {
  body { font-size: 1.0625rem; line-height: 1.58; }

  .frame { padding: 0 1rem; }
  .col { margin-left: 0; }

  .col h2,
  .hang {
    float: none;
    width: auto;
    margin: 0 0 0.6rem;
  }
  .col h2 { font-size: 1.25rem; line-height: 1.3; }

  .site-header { padding-top: 1.25rem; }
  .site-header .frame { display: block; }
  .site-name { display: inline-block; margin-bottom: 0.4rem; font-size: 1.125rem; }
  .site-nav ul { gap: 0.1rem 1rem; font-size: 1rem; }

  .page-head, .intro { padding-top: 2.5rem; }
  .page-head { margin-bottom: 2rem; }
  h1 { font-size: 1.875rem; }
  .lede { font-size: 1.15rem; }

  .intro { display: grid; grid-template-columns: minmax(0, 1fr) 6.5rem; column-gap: 1.25rem; }
  .intro .hang { grid-column: 2; grid-row: 1; margin: 0; }
  .intro .portrait { width: 6.5rem; }
  .intro .intro-text { display: contents; }
  .intro h1 { grid-column: 1; grid-row: 1; align-self: end; font-size: 2.25rem; margin: 0; }
  .intro .intro-body { grid-column: 1 / -1; margin-top: 1.25rem; }

  .section { margin-top: 2.75rem; }

  .dated > li { grid-template-columns: 4.5rem minmax(0, 1fr); column-gap: 0.75rem; }

  .person { grid-template-columns: 4.5rem minmax(0, 1fr); column-gap: 1rem; }
  .person img { width: 4.5rem; }
  .dated.wide > li { grid-template-columns: 6rem minmax(0, 1fr); }
  .dated.years > li { grid-template-columns: 2.75rem minmax(0, 1fr); column-gap: 0.85rem; }
  .intro-body > p:first-child { font-size: 1.15rem; }

  .prose > :has(+ h2) { margin-bottom: 2.5rem; }

  .intro-body > p,
  .theme > p,
  #together ~ p {
    text-align: left;
    hyphens: manual;
  }
}

@media print {
  .site-header nav, .abs-toggle, .skip { display: none; }
  .abstract[hidden] { display: none; }
  body { font-size: 11pt; background: #fff; color: #000; }
  a { color: inherit; text-decoration: none; }
}