/* Dimitrios Mitsotakis — academic site
   Single stylesheet, no build step.

   Layout: fixed navy sidebar on the left, serif reading column on the right.
   To lighten the sidebar, change --sidebar-bg / --sidebar-ink below; nothing
   else depends on them. */

:root {
  /* Content */
  --ink:        #1c1f24;
  --ink-soft:   #4a5158;
  --ink-faint:  #767d85;
  --rule:       #e3e6ea;
  --bg:         #ffffff;
  --bg-soft:    #f6f8fa;
  --accent:     #14507a;
  --accent-lit: #1d6ea5;
  --title:      #0e6f78;   /* blue-green, used for page and section titles */
  --title-lit:  #13939e;   /* lighter blue-green, for hover */

  /* Sidebar */
  --sidebar-bg:      #12385a;
  --sidebar-bg-deep: #0d2b45;
  --sidebar-ink:     rgba(255, 255, 255, .70);
  --sidebar-strong:  #ffffff;
  --sidebar-rule:    rgba(255, 255, 255, .15);
  --sidebar-hover:   rgba(255, 255, 255, .08);
  --sidebar-w:       16.5rem;

  /* Width of the reading column. It fills whatever space the sidebar leaves,
     up to this cap. Raise the cap for wider text, or set it to 100% to run
     edge to edge on any monitor. Past roughly 90 characters a line, the eye
     starts losing its place returning to the left margin, which is why there
     is a cap at all. */
  --measure: min(72rem, 100%);

  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

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

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 16.25px;
  line-height: 1.68;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

.skip {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--accent);
  color: #fff;
  padding: .6rem 1rem;
  z-index: 100;
}
.skip:focus { left: 0; }

/* ---------- Shell ---------- */

.layout { display: flex; align-items: flex-start; }

.main-col { flex: 1 1 auto; min-width: 0; }

/* ---------- Sidebar ---------- */

.sidebar {
  flex: 0 0 var(--sidebar-w);
  width: var(--sidebar-w);
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  background: var(--sidebar-bg);
  background-image: linear-gradient(180deg, var(--sidebar-bg) 0%, var(--sidebar-bg-deep) 100%);
  color: var(--sidebar-ink);
  display: flex;
  flex-direction: column;
}

.sidebar-inner {
  padding: 2.25rem 1.6rem 1.5rem;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.sidebar-brand {
  font-family: var(--serif);
  font-size: 1.3rem;
  line-height: 1.25;
  font-weight: 600;
  margin: 0;
}
.sidebar-brand a { color: var(--sidebar-strong); text-decoration: none; border: 0; }
.sidebar-brand a:hover { opacity: .85; }

.sidebar hr {
  border: 0;
  border-top: 1px solid var(--sidebar-rule);
  margin: 1.35rem 0 1.1rem;
}

/* Navigation */

.nav-toggle { display: none; }

nav.site-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--sans);
  font-size: .88rem;
}

nav.site-nav a {
  display: block;
  padding: .42rem .6rem;
  margin: 0 -.6rem;
  border-radius: 4px;
  color: var(--sidebar-ink);
  text-decoration: none;
  border: 0;
  transition: background-color .12s ease, color .12s ease;
}
nav.site-nav a:hover {
  background: var(--sidebar-hover);
  color: var(--sidebar-strong);
}
nav.site-nav a[aria-current="page"] {
  color: var(--sidebar-strong);
  font-weight: 600;
  background: var(--sidebar-hover);
  box-shadow: inset 2px 0 0 var(--sidebar-strong);
}

.sidebar-foot {
  margin-top: auto;
  padding-top: 2rem;
  font-family: var(--sans);
  font-size: .76rem;
  line-height: 1.6;
  color: rgba(255, 255, 255, .5);
}
.sidebar-foot a {
  color: rgba(255, 255, 255, .72);
  border-bottom: 1px solid rgba(255, 255, 255, .25);
  text-decoration: none;
}
.sidebar-foot a:hover {
  color: var(--sidebar-strong);
  border-bottom-color: var(--sidebar-strong);
}

/* ---------- Content ---------- */

main {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 3.25rem 2.5rem 4rem;
}

/* ---------- Page masthead ---------- */

.page-head {
  margin: 0 0 2.3rem;
  padding-bottom: 1.2rem;
  border-bottom: 1px solid var(--rule);
}

h1.page-title {
  font-size: 2.85rem;
  line-height: 1.1;
  font-weight: 600;
  letter-spacing: -.02em;
  color: var(--title);
  margin: 0;
}

/* University logo on the About page — its own line above the text, pushed to
   the right edge of the column by the automatic left margin. */
.vuw-logo {
  display: block;
  border: 0;
  width: 270px;
  max-width: 62%;
  margin: 0 0 1.9rem auto;
}
.vuw-logo img { width: 100%; height: auto; border-radius: 0; }
.vuw-logo:hover { opacity: .82; }

h2 {
  font-size: 1.32rem;
  font-weight: 600;
  line-height: 1.32;
  letter-spacing: -.005em;
  margin: 2.9rem 0 .8rem;
  padding-top: 1.6rem;
  border-top: 1px solid var(--rule);
}

h3 {
  font-family: var(--sans);
  font-size: .78rem;
  font-weight: 600;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin: 2.3rem 0 .7rem;
}

p { margin: 0 0 1.2rem; }

/* ---------- Justification ----------
   Flush left and right. Automatic hyphenation is essential here: without it,
   long technical words ("Boussinesq", "well-posedness") open up rivers of
   whitespace. Relies on lang="en" being set on <html>. */

.content p,
.content li,
.content dd,
.epigraph p {
  text-align: justify;
  text-justify: inter-word;
  hyphens: auto;
  -webkit-hyphens: auto;
  -ms-hyphens: auto;
  hyphenate-limit-chars: 6 3 3;   /* don't hyphenate short words */
}

/* Headings, captions and short labels stay ragged-right. */
.content h1, .content h2, .content h3,
figcaption, .eq-note, .epigraph cite,
.facts p, .badges li {
  text-align: left;
  hyphens: manual;
  -webkit-hyphens: manual;
}

/* Bibliographies contain unbreakable DOIs and URLs; let them break rather
   than blow a line apart. */
ol.refs li, ul.refs li, dl.refs dd {
  overflow-wrap: break-word;
  word-break: break-word;
}

a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid rgba(20, 80, 122, .3);
}
a:hover { color: var(--accent-lit); border-bottom-color: var(--accent-lit); }

/* ---------- Epigraph ---------- */

.epigraph {
  margin: 0 0 2.6rem;
  padding: 0 0 0 1.2rem;
  border-left: 3px solid var(--rule);
  color: var(--ink-soft);
  font-style: italic;
  font-size: .88rem;
  line-height: 1.6;
}
.epigraph p { margin: 0 0 .5rem; }
.epigraph cite {
  display: block;
  font-style: normal;
  font-family: var(--sans);
  font-size: .72rem;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

/* ---------- Media ---------- */

figure { margin: 2.1rem 0; }

figure img, .content img {
  display: block;
  max-width: 100%;
  height: auto;
  border-radius: 3px;
}

figcaption {
  font-family: var(--sans);
  font-size: .8rem;
  color: var(--ink-faint);
  margin-top: .6rem;
  line-height: 1.55;
}

.portrait {
  float: left;
  width: 155px;
  margin: .3rem 1.7rem 1.25rem 0;
  border-radius: 3px;
}

.figure-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: .7rem;
  margin: 1.5rem 0 .75rem;
}
.figure-grid img {
  width: 100%;
  height: auto;
  border: 1px solid var(--rule);
  border-radius: 3px;
  background: #fff;
}

.video {
  position: relative;
  padding-bottom: 56.25%;
  height: 0;
  margin: .75rem 0 2rem;
  background: var(--bg-soft);
  border-radius: 3px;
  overflow: hidden;
}
.video iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }

.asset-missing {
  display: block;
  padding: 2.25rem 1rem;
  text-align: center;
  background: var(--bg-soft);
  border: 1px dashed var(--rule);
  border-radius: 3px;
  font-family: var(--sans);
  font-size: .8rem;
  color: var(--ink-faint);
}

/* ---------- Lists ---------- */

ul, ol { margin: 0 0 1.2rem; padding-left: 1.35rem; }
li { margin-bottom: .4rem; }

ol.refs, ul.refs {
  font-size: .92rem;
  line-height: 1.55;
  padding-left: 1.6rem;
}
ol.refs li, ul.refs li { margin-bottom: .85rem; }
ol.refs::marker { color: var(--ink-faint); }

dl.refs { font-size: .92rem; line-height: 1.55; }
dl.refs dt {
  font-family: var(--sans);
  font-weight: 600;
  font-size: .78rem;
  color: var(--ink-faint);
  margin-top: .95rem;
}
dl.refs dd { margin: .15rem 0 0; }

/* ---------- Profile badges ----------
   The three logos have different proportions: GitHub and ResearchGate are 10:3
   wordmarks, Google Scholar is a stacked 1.76:1 mark. Matching their heights
   would leave Scholar half the width of the others, so instead every badge gets
   an identical tile and the logo is fitted inside it with object-fit. Equal
   footprints, each logo at its largest possible size within them. */

.badges {
  list-style: none;
  padding: 0;
  margin: 2.1rem 0 .5rem;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  align-items: center;
  gap: 1rem;
}

/* One tile against each edge, one centred between them. */
.badges li:nth-child(1) { justify-self: start; }
.badges li:nth-child(2) { justify-self: center; }
.badges li:nth-child(3) { justify-self: end; }

.badges a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 156px;
  height: 92px;
  padding: .85rem;
  border: 1px solid var(--rule);
  border-radius: 6px;
  background: #fff;
  transition: border-color .12s ease, box-shadow .12s ease;
}
.badges a:hover {
  border-color: var(--title);
  box-shadow: 0 1px 4px rgba(14, 111, 120, .14);
}

.badges img {
  display: block;
  max-width: 100%;
  max-height: 100%;
  width: auto;
  height: auto;
  object-fit: contain;
  border-radius: 2px;
}

/* ---------- Facts ---------- */

/* Two figures on one line: first against the left edge, second against the
   right. They wrap onto separate lines if the column gets too narrow. */
.facts {
  margin: 2rem 0;
  padding: 1rem 1.25rem;
  background: var(--bg-soft);
  border-left: 3px solid var(--accent);
  border-radius: 0 4px 4px 0;
  font-family: var(--sans);
  font-size: .86rem;
  color: var(--ink-soft);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: .35rem 2rem;
}
.facts p { margin: 0; }

/* ---------- Collapsible sections (Research page) ----------
   Native <details>, so the page works with JavaScript disabled and the browser
   handles keyboard and screen-reader semantics. The <h2> lives inside the
   <summary> to keep the document outline intact. */

.section { border-top: 1px solid var(--rule); }
.section:last-of-type { border-bottom: 1px solid var(--rule); }

.section > summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
  padding: 1.1rem 0;
  cursor: pointer;
  list-style: none;
  user-select: none;
}
.section > summary::-webkit-details-marker { display: none; }
.section > summary::marker { content: ""; }

.section > summary h2 {
  margin: 0;
  padding-top: 0;
  border-top: 0;
  font-size: 1.25rem;
  color: var(--title);
  transition: color .12s ease;
}
.section > summary:hover h2 { color: var(--title-lit); }

.section > summary:focus-visible {
  outline: 2px solid var(--title);
  outline-offset: 3px;
  border-radius: 2px;
}

/* Chevron, rotating when the section opens */
.section > summary::after {
  content: "";
  flex: 0 0 auto;
  width: .5rem;
  height: .5rem;
  border-right: 2px solid var(--ink-faint);
  border-bottom: 2px solid var(--ink-faint);
  transform: rotate(45deg) translate(-2px, -2px);
  transition: transform .16s ease, border-color .12s ease;
}
.section[open] > summary::after {
  transform: rotate(-135deg) translate(-3px, -3px);
  border-color: var(--title);
}

.section-body { padding: .25rem 0 1.6rem; }
.section-body > :first-child { margin-top: 0; }
.section-body h3 { margin-top: 1.8rem; }

/* ---------- Gallery ---------- */

.gallery-item { margin: 0 0 2.75rem; }
.gallery-item h2 {
  border-top: 0;
  padding-top: 0;
  font-size: 1.08rem;
  margin: 0 0 .6rem;
}

/* ---------- Equations ---------- */

.eq { margin: 1.5rem 0; overflow-x: auto; }

.eq-note {
  font-family: var(--sans);
  font-size: .79rem;
  color: var(--ink-faint);
  border-left: 3px solid var(--rule);
  padding-left: .9rem;
  margin: 1.5rem 0;
}

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

footer.site-footer { border-top: 1px solid var(--rule); }
.footer-inner {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 1.6rem 2.5rem 3rem;
  font-family: var(--sans);
  font-size: .8rem;
  color: var(--ink-faint);
  line-height: 1.6;
}
.footer-inner p { margin: 0; }

/* ---------- Responsive ---------- */

/* Wider windows: grow the type and the gutters along with the column, so a
   maximized window gains readable text rather than just longer lines. */

@media (min-width: 1280px) {
  body { font-size: 17.25px; }
  main { padding: 3.5rem 3.5rem 4.5rem; }
  .footer-inner { padding-left: 3.5rem; padding-right: 3.5rem; }
}

@media (min-width: 1680px) {
  body { font-size: 18.25px; }
  main { padding: 4rem 4.5rem 5rem; }
  .footer-inner { padding-left: 4.5rem; padding-right: 4.5rem; }
}

@media (max-width: 900px) {
  :root { --sidebar-w: 14rem; }
  main { padding: 2.75rem 2rem 3.5rem; }
  .footer-inner { padding-left: 2rem; padding-right: 2rem; }
}

@media (max-width: 720px) {
  body { font-size: 15.75px; }

  .layout { display: block; }

  .sidebar {
    position: static;
    width: auto;
    height: auto;
    overflow: visible;
    display: block;
  }
  .sidebar-inner { padding: 1.1rem 1.25rem; position: relative; }

  .sidebar-brand { font-size: 1.15rem; }
  .sidebar hr { display: none; }

  .page-head { margin-bottom: 1.9rem; }
  h1.page-title { font-size: 2.1rem; }

  .nav-toggle {
    display: block;
    position: absolute;
    right: 1.25rem;
    top: 1.1rem;
    background: transparent;
    border: 1px solid var(--sidebar-rule);
    border-radius: 4px;
    padding: .35rem .65rem;
    font-family: var(--sans);
    font-size: .82rem;
    color: var(--sidebar-strong);
    cursor: pointer;
  }

  nav.site-nav { display: none; margin-top: 1rem; }
  nav.site-nav.open { display: block; }

  .sidebar-foot { display: none; }

  h1 { font-size: 1.8rem; }
  main { padding: 2.25rem 1.25rem 3rem; }
  .footer-inner { padding: 1.5rem 1.25rem 2.5rem; }

  .portrait { float: none; width: 150px; margin: 0 0 1.5rem; }
  .vuw-logo { width: 200px; max-width: 60%; margin: 0 0 1.5rem auto; }

  /* Keep the three across, but let the tiles shrink to fit a phone. */
  .badges { gap: .6rem; }
  .badges a { width: 100%; max-width: 124px; height: 74px; padding: .6rem; }
  .figure-grid { grid-template-columns: repeat(2, 1fr); }

  /* A phone column is too narrow to justify cleanly — too few words per line
     for the spacing to even out. Fall back to ragged-right. */
  .content p,
  .content li,
  .content dd,
  .epigraph p {
    text-align: left;
  }
}

@media print {
  .sidebar, .site-footer { display: none; }
  .layout { display: block; }
  body { font-size: 11pt; }
  main { max-width: none; padding: 0; }
  a { color: inherit; border: 0; }
}