/* =========================================================================
   Binz Lab — stylesheet
   Minimal, academic, hackable. No build step, no dependencies.

   To re-theme the whole site, edit the CSS variables in :root below.
   Palette is taken from the MPI for Biological Cybernetics (Tübingen).
   ========================================================================= */

:root {
  /* Brand colors (from kyb.tuebingen.mpg.de) */
  --brand:        #29485d; /* deep slate blue — headings, lab name */
  --brand-bright: #006699; /* brighter blue — links, accents */
  --brand-dark:   #00445f; /* darker blue — hovers */
  --brand-tint:   #bfd9e6; /* light blue — soft fills */

  /* Neutrals */
  --ink:        #263238;   /* body text */
  --ink-soft:   #455a64;   /* secondary text */
  --line:       #d8dde0;   /* hairline borders */
  --bg:         #eef1f3;   /* grey page background (only surface) */

  /* Type — system sans throughout, no CDN dependency */
  --sans:  -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica,
           Arial, sans-serif;

  /* Layout */
  --container: 820px;
}

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

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

body {
  margin: 0;
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.65;
  color: var(--ink);
  background: var(--bg);
  /* thin brand accent line across the very top of the page */
  border-top: 4px solid var(--brand-bright);
}

/* ---------- Accessibility ----------------------------------------------- */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--brand);
  color: #fff;
  padding: 10px 16px;
  z-index: 100;
}
.skip-link:focus { left: 8px; top: 8px; }

:focus-visible {
  outline: 3px solid var(--brand-bright);
  outline-offset: 2px;
}
/* skip-link sends focus here; no visible ring needed on the content wrapper */
main:focus { outline: none; }

/* ---------- Header / nav ------------------------------------------------- */
.site-header {
  background: var(--bg);
  border-bottom: 1px solid var(--line);
}

.site-header__inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 18px 24px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
}

.brand {
  text-decoration: none;
  border-bottom: 0;
  display: inline-flex;
  align-items: center;
  gap: 0.32em;
}
.brand-word {
  display: inline-flex;
  align-items: center;
  font-size: 1.7rem;
  font-weight: 700;
  color: var(--brand);
  letter-spacing: 0.02em;
  line-height: 1;
}
/* the bullseye emblem standing in for the "O" — tweak height to taste */
.brand-o {
  height: 0.8em;
  width: auto;
  margin: 0 0.03em;
  position: relative;
  top: 0.06em;   /* nudge the emblem down to sit on the baseline; increase to lower */
}
.brand-lab {
  font-size: 1.7rem;
  font-weight: 400;
  color: var(--brand);
  line-height: 1;
}
.brand:hover { opacity: 0.8; }

/* reusable inline "CORE Lab" lockup — scales with the surrounding text size.
   Usage: <span class="core" role="img" aria-label="CORE Lab">C<img
   class="core-o" src="core-mark.png" alt="">RE<span class="lab">Lab</span></span> */
.core {
  display: inline-flex;
  align-items: center;
  white-space: nowrap;
  color: var(--brand);
  font-weight: 700;
}
.core .lab { font-weight: 400; margin-left: 0.26em; }
.core-o {
  height: 0.8em;
  width: auto;
  margin: 0 0.02em;   /* a bit more breathing room around the emblem in running text */
  position: relative;
  top: 0.02em;       /* vertical baseline nudge (raise/lower to taste) */
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 20px;
}
.nav a {
  font-size: 1rem;
  color: var(--ink-soft);
  text-decoration: none;
  padding: 2px 0;
  border-bottom: 2px solid transparent;
}
.nav a:hover { color: var(--brand-bright); }
.nav a[aria-current="page"] {
  color: var(--brand-bright);
  border-bottom-color: var(--brand-bright);
}

/* ---------- Main content area ------------------------------------------- */
main {
  max-width: var(--container);
  margin: 40px auto;
  padding: 0 24px;
}

/* .card is now just a spacing wrapper — no white box */
.card {
  padding: 8px 0 48px;
}

/* ---------- Photo / figure ---------------------------------------------- */
.photo {
  margin: 2rem 0 0;
}
.photo img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 4px;
}
.photo figcaption {
  margin-top: 8px;
  color: var(--ink-soft);
  font-size: 0.88rem;
}

/* ---------- Typography --------------------------------------------------- */
h1 {
  font-weight: 600;
  font-size: 2.1rem;
  line-height: 1.2;
  color: var(--brand);
  margin: 0 0 0.5rem;
}
/* short accent rule under the page title */
h1 + .rule {
  width: 64px;
  height: 3px;
  background: var(--brand-bright);
  border: 0;
  margin: 0 0 1.6rem;
}

h2 {
  font-weight: 600;
  font-size: 1.4rem;
  color: var(--brand);
  margin: 2.4rem 0 0.8rem;
}

h3 {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--ink);
  margin: 1.6rem 0 0.3rem;
}

p { margin: 0 0 1.1rem; }

.lead {
  font-size: 1.2rem;
  color: var(--ink-soft);
  line-height: 1.6;
}

a {
  color: var(--brand-bright);
  text-decoration: none;
  border-bottom: 1px solid var(--brand-tint);
}
a:hover { color: var(--brand-dark); border-bottom-color: var(--brand-bright); }

strong { color: var(--brand); }

/* ---------- Challenges list (Main page) --------------------------------- */
.challenges {
  margin: 0.8rem 0 0 1.2rem;
  padding: 0;
}
.challenges li {
  margin-bottom: 0.5rem;
}
.challenges .label {
  font-weight: 600;
  color: var(--brand);
}
/* bullet markers in the brand blue */
.challenges li::marker,
.doclist li::marker { color: var(--brand); }

/* ---------- People grid -------------------------------------------------- */
.people-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 28px 24px;
  margin: 1.2rem 0 0;
}
.person {
  text-align: center;
}
.person .avatar {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 110px;
  height: 110px;
  margin: 0 auto 12px;
  border-radius: 50%;
  background: var(--brand-tint);
  color: var(--brand-dark);
  font-size: 1.6rem;
  object-fit: cover;       /* applies when avatar is an <img> */
  overflow: hidden;
}
.person .name { font-weight: 600; color: var(--brand); }
.person .role { font-size: 0.92rem; color: var(--ink-soft); }
.person .links { font-size: 0.85rem; margin-top: 4px; }

/* Open position slots — a hollow dashed circle that reads as an invitation */
.person--open .avatar {
  background: transparent;
  border: 2px solid var(--brand);
  color: var(--brand);   /* matches the CORE logo/text blue */
}
.person--open .avatar-icon { width: 56px; height: 56px; }

/* ---------- Resource links (Resources page) ----------------------------- */
.resource-links {
  display: flex;
  flex-wrap: wrap;
  gap: 40px;
  margin: 1rem 0;
}
.resource {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  width: 92px;
  color: var(--brand);
  text-decoration: none;
  border-bottom: 0;
}
.resource-icon { height: 100px; width: auto; }
.resource span { font-weight: 600; font-size: 0.95rem; color: var(--brand); }
.resource:hover span { color: var(--brand-bright); }
.resource:hover .resource-icon { opacity: 0.82; }

/* Documents list + highlighted acronym initials (the \color{Hred} letters) */
.doclist { margin: 0.8rem 0 0 1.2rem; padding: 0; }
.doclist li { margin-bottom: 0.4rem; }
.acro { color: var(--brand); font-weight: 700; }

/* ---------- Simple link lists (Open Positions) -------------------------- */
.linklist { list-style: none; margin: 0.4rem 0 0; padding: 0; }
.linklist li { padding: 7px 0; border-bottom: 1px solid var(--line); }
.linklist li:last-child { border-bottom: 0; }
.linklist .meta { color: var(--ink-soft); font-size: 0.92rem; }

/* ---------- Callout (Open Positions) ------------------------------------ */
.callout {
  background: rgba(0,0,0,0.04);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 20px 24px;
  margin: 1.4rem 0;
}

.button {
  display: inline-block;
  background: var(--brand);
  color: #fff;
  padding: 11px 22px;
  border-radius: 4px;
  border: 0;
  text-decoration: none;
  font-weight: 600;
}
.button:hover { background: var(--brand-dark); color: #fff; }

/* editorial helper for placeholders you should fill in */
.todo {
  background: #fffbe6;
  border: 1px dashed #d6c560;
  color: #6b5d00;
  font-size: 0.85rem;
  padding: 2px 7px;
  border-radius: 3px;
}

/* ---------- Footer ------------------------------------------------------- */
.site-footer {
  max-width: var(--container);
  margin: 8px auto 48px;
  padding: 20px 24px 0;
  border-top: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: 0.88rem;
}
.site-footer a { border-bottom: 0; }

/* ---------- Responsive --------------------------------------------------- */
@media (max-width: 640px) {
  body { font-size: 14px; }
  h1 { font-size: 1.7rem; }
  .site-header__inner { padding: 16px 20px; }
  main { padding: 0 16px; }
}