@import url('https://fonts.googleapis.com/css2?family=Playfair+Display&display=swap');

:root {
  --bg: #ffffff;
  --fg: #0f172a;
  --muted: #475569;
  --brand: #FFBAED;
  --brand-hover: #FFBAED;
  --border: #e2e8f0;
}


body {
  margin: 0;
  font-family: 'Playfair Display', serif;
  font-weight: 500;
  font-size: 12pt;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.6;
}

header {
  display: flex;
  justify-content: space-between; /* keeps nav on the left, button on the right */
  align-items: center;
  padding: 0.5rem 1rem;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}

nav ul {
  list-style: none;
  margin: 0;
  padding: 0.5rem 1rem;
  display: flex;
  gap: 1rem;
}

nav a {
  text-decoration: none;
  color: var(--fg);
  font-weight: 600;
  padding: 0.25rem 0.5rem;
  border-radius: 0.25rem;
}

nav a:hover {
  background: var(--brand);
  color: white;
}

main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem 1rem;
}

.abstract-text {
  display: none;
  margin-top: 0.5rem;
  padding: 0.5rem;
  border-left: 3px solid #ccc;
  background-color: #f9f9f9;
  color: #0f172a; /* dark text for light background */
}

#hero img {
  border: 3px solid var(--border);
}

footer {
  border-top: 1px solid var(--border);
  text-align: center;
  padding: 1rem;
  color: var(--muted);
  font-size: 0.9rem;
}
#theme-toggle {
  padding: 0.4rem 0.8rem;
  border: 2px solid var(--border);
  border-radius: 0.25rem;
  background: transparent;
  color: var(--fg);
  cursor: pointer;
  font-weight: 600;
  transition: all 0.2s ease;
}

#theme-toggle:hover {
  background: var(--brand);
  color: white;
  border-color: var(--brand);
}

body.dark-mode {
  background-color: #0f172a;
  color: #f1f5f9;
}

/* Dark mode header and footer */
body.dark-mode header,
body.dark-mode footer {
  background-color: #1e293b;
  border-color: #334155;
}

body.dark-mode nav a,
body.dark-mode #theme-toggle,
body.dark-mode .dark-mode-toggle {
  color: #f1f5f9;
  border-color: #334155;
}

body.dark-mode nav a:hover {
  background: #0284c7; /* blue accent */
  color: white;
}

body.dark-mode .theme-toggle:hover {
  background: #0284c7;
  border-color: #0284c7;
  color: white;
}

body.dark-mode .abstract-text {
  background-color: #1e293b;
  color: #f1f5f9;
  border-left: 1px solid #334155;
}


@media (max-width: 600px) {
  nav ul {
    flex-wrap: wrap;
    gap: 0.5rem;
  }
}