:root {
  --color-text: #222;
  --color-bg: #fff;
  --color-accent: #7a1f2b; /* deep academic red — change to any color you like */
  --color-muted: #666;
  --color-border: #e5e5e5;
  --font-serif: Georgia, 'Times New Roman', serif;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
  --max-width: 860px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.65;
  font-size: 17px;
}

.wrapper {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

h1, h2, h3 {
  font-family: var(--font-serif);
  line-height: 1.25;
  margin-top: 1.6em;
  margin-bottom: 0.5em;
}
h1 { font-size: 2rem; margin-top: 0.4em; }
h2 { font-size: 1.4rem; border-bottom: 1px solid var(--color-border); padding-bottom: 0.3em; }
h3 { font-size: 1.1rem; }

a { color: var(--color-accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* Header / nav */
.site-header {
  border-bottom: 1px solid var(--color-border);
  padding: 18px 0;
}
.nav-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
}
.site-title {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: bold;
  color: var(--color-text);
}
.site-nav {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}
.site-nav a { color: var(--color-text); font-size: 0.95rem; }
.site-nav a:hover { color: var(--color-accent); }

.nav-toggle, .nav-toggle-label { display: none; }

@media (max-width: 640px) {
  .nav-toggle-label {
    display: block;
    cursor: pointer;
    width: 26px;
  }
  .nav-toggle-label span {
    display: block;
    height: 2px;
    margin: 5px 0;
    background: var(--color-text);
  }
  .site-nav {
    display: none;
    flex-direction: column;
    width: 100%;
    margin-top: 14px;
    gap: 12px;
  }
  .nav-toggle:checked ~ .site-nav {
    display: flex;
  }
}

/* Homepage intro: photo beside text */
.intro {
  display: flex;
  align-items: flex-start;
  gap: 40px;
  padding: 36px 0 8px;
}
.intro-photo { flex: 0 0 32%; max-width: 280px; }
.intro-photo img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 4px;
}
.intro-text { flex: 1; min-width: 0; }
.intro-text h1 { margin: 0 0 0.15em; font-size: 1.9rem; }
.intro-tagline { color: var(--color-muted); margin: 0 0 1em; }
.intro-text p { margin: 0 0 0.9em; }
.intro-actions { margin-top: 1.2em; }
@media (max-width: 720px) {
  .intro { gap: 24px; }
}
@media (max-width: 520px) {
  .intro { flex-direction: column; gap: 22px; }
  .intro-photo { flex: none; width: 100%; max-width: 320px; margin: 0 auto; }
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 8px 16px;
  border: 1px solid var(--color-accent);
  border-radius: 4px;
  color: var(--color-accent);
  font-size: 0.9rem;
  margin: 4px 6px 4px 0;
}
.btn:hover { background: var(--color-accent); color: #fff; text-decoration: none; }
.btn-secondary { border-color: var(--color-border); color: var(--color-text); }
.btn-secondary:hover { background: var(--color-text); border-color: var(--color-text); }

/* Paper lists */
.paper-list { list-style: none; padding: 0; }
.paper-list li {
  padding: 14px 0;
  border-bottom: 1px solid var(--color-border);
}
.paper-list-authors, .paper-list-date { color: var(--color-muted); font-size: 0.9rem; }

/* Individual paper page */
.paper-back { font-size: 0.9rem; }
.paper-authors, .paper-status { color: var(--color-muted); margin: 0.2em 0; }
.abstract-toggle, .bibtex-toggle {
  margin: 20px 0;
  padding: 14px 16px;
  background: #f8f7f5;
  border: 1px solid var(--color-border);
  border-radius: 4px;
}
.abstract-toggle summary, .bibtex-toggle summary {
  cursor: pointer;
  font-weight: bold;
  font-family: var(--font-serif);
}
.bibtex-toggle pre {
  white-space: pre-wrap;
  font-size: 0.85rem;
  overflow-x: auto;
}

/* Homepage research section */
html { scroll-behavior: smooth; }
#research { scroll-margin-top: 16px; }
.paper-item { padding: 22px 0 8px; border-bottom: 1px solid var(--color-border); }
.paper-item:last-child { border-bottom: none; }
.paper-title { font-size: 1.15rem; line-height: 1.3; margin: 0 0 0.2em; }
.papers { margin-top: 4px; }
.pres-inline { margin: 0 0 6px; font-size: 0.93rem; line-height: 1.7; }
.pres { white-space: normal; }
.pres + .pres::before { content: " \00b7  "; color: var(--color-muted); white-space: pre; }
.pres em { color: var(--color-muted); }
.paper-item .abstract-toggle { margin: 14px 0; }
.presentations-label {
  margin: 14px 0 4px;
  font-family: var(--font-serif);
  font-size: 0.95rem;
  font-style: italic;
  color: var(--color-muted);
}

/* CV-style dated lists (presentations, teaching) */
.cv-list { list-style: none; padding: 0; margin: 0 0 12px; }
.cv-list li {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 3px 0;
  font-size: 0.95rem;
}
.cv-date { color: var(--color-muted); font-style: italic; white-space: nowrap; }
.cv-note { color: var(--color-muted); font-size: 0.85rem; margin: 2px 0 12px; }
@media (max-width: 640px) {
  .cv-list li { flex-direction: column; gap: 0; padding: 6px 0; }
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--color-border);
  margin-top: 60px;
  padding: 24px 0;
  color: var(--color-muted);
  font-size: 0.9rem;
}
.footer-links a { margin-right: 14px; color: var(--color-muted); }
.footer-links a:hover { color: var(--color-accent); }
.footer-copy { margin-top: 10px; }

.page-content { min-height: 60vh; }