/* =========================================================
   Campbell Host-Parasite Interactions Lab — stylesheet
   Edit colors in the :root block below to re-theme the site.
   ========================================================= */

:root {
  --color-ink: #1b2a2e;
  --color-body: #33484d;
  --color-bg: #fbfaf7;
  --color-surface: #ffffff;
  --color-border: #e2ddd0;
  --color-primary: #1f5f5b;      /* deep teal */
  --color-primary-dark: #143f3d;
  --color-accent: #c1622d;       /* warm terracotta accent */
  --color-accent-soft: #f4e6da;
  --color-primary-soft: #e7efee;
  --max-width: 1080px;
  --radius: 10px;
  font-size: 17px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, "Times New Roman", serif;
  color: var(--color-body);
  background: var(--color-bg);
  line-height: 1.65;
}

h1, h2, h3, h4 {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  color: var(--color-ink);
  line-height: 1.2;
  margin-top: 0;
}

h1 { font-size: 2.1rem; }
h2 { font-size: 1.5rem; margin-bottom: 0.75em; }
h3 { font-size: 1.15rem; }

a { color: var(--color-primary); }
a:hover { color: var(--color-accent); }

img { max-width: 100%; }

.wrap {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--color-primary);
  color: #fff;
  padding: 0.5rem 1rem;
  z-index: 100;
}
.skip-link:focus { left: 0; }

/* Header */
.site-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 20;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 0.75rem;
  padding-bottom: 0.75rem;
}
.site-brand {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
  color: var(--color-ink);
}
.brand-mark { flex-shrink: 0; }
.brand-text { display: flex; flex-direction: column; line-height: 1.2; }
.brand-title {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  font-weight: 700;
  font-size: 1.05rem;
}
.brand-sub { font-size: 0.78rem; color: var(--color-body); }

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: 0.4rem 0.6rem;
  cursor: pointer;
}
.hamburger, .hamburger::before, .hamburger::after {
  content: "";
  display: block;
  width: 20px;
  height: 2px;
  background: var(--color-ink);
  position: relative;
}
.hamburger::before { top: -6px; }
.hamburger::after { top: 4px; }

.site-nav ul {
  list-style: none;
  display: flex;
  gap: 1.5rem;
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  font-size: 0.95rem;
}
.site-nav a {
  text-decoration: none;
  color: var(--color-ink);
  padding-bottom: 4px;
  border-bottom: 2px solid transparent;
}
.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--color-primary);
  border-bottom-color: var(--color-accent);
}

/* Hero */
.hero {
  background: linear-gradient(160deg, var(--color-primary-dark), var(--color-primary) 75%);
  color: #fff;
}
.hero-inner { padding: 4rem 1.5rem 3.5rem; }
.eyebrow {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.8rem;
  color: #cfe4e0;
  margin: 0 0 0.75rem;
}
.hero h1 { color: #fff; font-size: 2.4rem; max-width: 20ch; }
.hero-tagline { font-size: 1.15rem; max-width: 55ch; color: #eaf3f1; }
.hero-actions { display: flex; gap: 0.9rem; flex-wrap: wrap; margin-top: 1.5rem; }

.btn {
  display: inline-block;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  font-weight: 600;
  font-size: 0.95rem;
  padding: 0.7rem 1.3rem;
  border-radius: 999px;
  text-decoration: none;
  border: 1.5px solid transparent;
}
.btn-primary { background: var(--color-accent); color: #fff; }
.btn-primary:hover { background: #a84f22; color: #fff; }
.hero .btn-secondary { background: transparent; color: #fff; border-color: rgba(255,255,255,0.6); }
.hero .btn-secondary:hover { background: rgba(255,255,255,0.12); color: #fff; }
.page .btn-secondary { background: var(--color-primary-soft); color: var(--color-primary-dark); border-color: var(--color-primary-soft); }

/* Page */
.page { padding: 3rem 1.5rem; }
.page-header { margin-bottom: 1.5rem; }
.page-subtitle { color: var(--color-body); font-size: 1.1rem; }
.page-content > *:first-child { margin-top: 0; }
.page-content h2 { margin-top: 2.2rem; }
.page-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.25rem 0;
  font-size: 0.95rem;
}
.page-content th, .page-content td {
  text-align: left;
  padding: 0.55rem 0.75rem;
  border-bottom: 1px solid var(--color-border);
  vertical-align: top;
}
.page-content th { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif; }
.page-content blockquote {
  border-left: 3px solid var(--color-accent);
  margin: 1.5rem 0;
  padding: 0.25rem 1.25rem;
  background: var(--color-accent-soft);
  border-radius: 0 6px 6px 0;
}
.back-link { margin-top: 2rem; }

/* Research grid on home */
.research-grid-section { padding: 3rem 1.5rem; }
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 1.25rem;
  margin-top: 1.25rem;
}
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.3rem 1.4rem;
}
.card h3 { color: var(--color-primary-dark); }
.card p { margin-bottom: 0; font-size: 0.97rem; }
.section-more { margin-top: 1.25rem; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif; }

/* FR3 callout */
.fr3-callout {
  background: var(--color-primary-soft);
  padding: 3rem 1.5rem;
}
.fr3-callout h2 { color: var(--color-primary-dark); }
.fr3-callout-inner { max-width: 700px; }

/* People */
.people-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
  margin-top: 1.5rem;
  list-style: none;
  padding: 0;
}
.person-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
}
.person-card img { width: 100%; aspect-ratio: 4/3; object-fit: cover; display: block; background: var(--color-primary-soft); }
.person-card .person-card-body { padding: 1rem 1.1rem; }
.person-card h3 { font-size: 1.05rem; margin-bottom: 0.15rem; }
.person-card .role { font-size: 0.88rem; color: var(--color-body); margin: 0; }
.person-header { display: flex; align-items: center; gap: 1.5rem; flex-wrap: wrap; }
.person-photo { width: 140px; height: 140px; object-fit: cover; border-radius: 50%; }

/* Publications */
.pub-list { list-style: none; padding: 0; margin: 1.5rem 0; }
.pub-list li {
  padding: 1rem 0;
  border-bottom: 1px solid var(--color-border);
}
.pub-list .pub-title { font-weight: 600; color: var(--color-ink); }
.pub-list .pub-meta { font-size: 0.9rem; color: var(--color-body); }
.pub-filters { margin: 1rem 0 0.5rem; font-size: 0.9rem; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif; }

/* News / posts */
.post-list { list-style: none; padding: 0; }
.post-list li { padding: 0.5rem 0; border-bottom: 1px solid var(--color-border); }
.post-list .post-date { font-size: 0.85rem; color: var(--color-body); margin-right: 0.75rem; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif; }
.post .post-date { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif; text-transform: uppercase; letter-spacing: 0.05em; font-size: 0.8rem; color: var(--color-accent); }

/* Footer */
.site-footer {
  background: var(--color-primary-dark);
  color: #dfeae7;
  margin-top: 4rem;
  font-size: 0.9rem;
}
.footer-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  padding: 2.5rem 1.5rem 1.5rem;
}
.site-footer a { color: #cfe4e0; }
.footer-bottom {
  padding: 1rem 1.5rem 2rem;
  font-size: 0.8rem;
  color: #9fbcb7;
}

/* Responsive */
@media (max-width: 720px) {
  .nav-toggle { display: inline-flex; align-items: center; justify-content: center; }
  .site-nav { display: none; width: 100%; }
  .site-nav.is-open { display: block; }
  .site-nav ul { flex-direction: column; gap: 0; padding: 0.5rem 0; }
  .site-nav a { display: block; padding: 0.6rem 0; }
  .header-inner { flex-wrap: wrap; }
  .hero h1 { font-size: 1.9rem; }
  .footer-inner { grid-template-columns: 1fr; }
}