/* Mark Kerssenfischer — academic homepage
   Plain, dependency-free CSS. No build step. */

:root {
  --ink: #1a1a1a;
  --muted: #5f6b7a;
  --accent: #14507a;       /* Bundesbank-ish deep blue */
  --accent-light: #e8f0f6;
  --rule: #e2e6ea;
  --bg: #ffffff;
  --max: 760px;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 17px;
  line-height: 1.6;
  color: var(--ink);
  background: var(--bg);
}

.wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 20px;
}

/* ---------- header ---------- */
.site-header {
  border-bottom: 1px solid var(--rule);
  padding: 38px 0 0;
}
.site-header h1 {
  margin: 0;
  font-size: 2rem;
  letter-spacing: -0.01em;
}
.tagline {
  margin: 4px 0 18px;
  color: var(--muted);
  font-size: 1.05rem;
}
.primary-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 22px;
}
.primary-nav a {
  display: inline-block;
  padding: 10px 0;
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
}
.primary-nav a:hover { text-decoration: underline; }

/* ---------- sections ---------- */
main { padding: 8px 0 40px; }

section {
  padding: 28px 0;
  border-bottom: 1px solid var(--rule);
}
section:last-child { border-bottom: 0; }

h2 {
  font-size: 1.35rem;
  margin: 0 0 18px;
  scroll-margin-top: 20px;
}
section { scroll-margin-top: 20px; }

.lede { font-size: 1.12rem; margin-top: 0; }
.muted { color: var(--muted); font-size: 0.95rem; }

/* inline link lists (about) */
.links {
  list-style: none;
  padding: 0;
  margin: 18px 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 12px;
}
.links a {
  display: inline-block;
  padding: 6px 14px;
  background: var(--accent-light);
  color: var(--accent);
  border-radius: 999px;
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 600;
}
.links a:hover { background: #d8e6f1; }

/* ---------- profile photo ---------- */
.headshot {
  float: right;
  width: 160px;
  height: 160px;
  border-radius: 12px;
  object-fit: cover;
  margin: 4px 0 12px 24px;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.18);
}
@media (max-width: 520px) {
  .headshot { float: none; display: block; margin: 0 auto 18px; }
}

/* ---------- publications ---------- */
.pub {
  padding: 18px 0;
  border-top: 1px solid var(--rule);
}
.pub:first-of-type { border-top: 0; padding-top: 0; }

.pub-title {
  font-size: 1.1rem;
  margin: 0 0 4px;
  line-height: 1.35;
}
.pub-meta {
  margin: 0 0 10px;
  color: var(--muted);
  font-size: 0.95rem;
}
.pub-abstract {
  margin: 0 0 12px;
  font-size: 0.98rem;
}
.pub-actions, .pub-sub {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 10px;
  margin: 0;
  font-size: 0.9rem;
}
.pub-sub {
  display: block;
  margin-top: 10px;
  color: var(--muted);
}
.pub-actions a {
  display: inline-block;
  padding: 5px 12px;
  border: 1px solid var(--accent);
  border-radius: 6px;
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
}
.pub-actions a:hover { background: var(--accent); color: #fff; }
.pub-sub a { color: var(--accent); }

/* ---------- simple lists ---------- */
.simple-list { padding-left: 1.1em; margin: 0; }
.simple-list li { margin-bottom: 10px; }
.simple-list a, .lede a, address a { color: var(--accent); }

address { font-style: normal; line-height: 1.7; }

/* ---------- footer ---------- */
.site-footer {
  border-top: 1px solid var(--rule);
  padding: 24px 0;
  color: var(--muted);
  font-size: 0.85rem;
}
.site-footer p { margin: 0; }

/* ---------- responsive ---------- */
@media (max-width: 520px) {
  body { font-size: 16px; }
  .site-header h1 { font-size: 1.6rem; }
}