@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;600&family=Merriweather:wght@400;700&display=swap');

:root {
    --shadow-soft: 0 2px 6px rgba(0, 0, 0, 0.03);
    --bg-main: #eaeff7;       /* clean bluish-gray */
    --accent: #2669ce;        /* deep scientific blue */
    --accent-hover: #1565c0;  /* steel blue */
    --footer-bg: #e8eaf6;     /* light gray-blue */
    --text-muted: #5f6b7a; 
    --nav-bg: #0f4d86;
}

body {
  margin: 0;
  padding: 0;
  background-color: var(--bg-main);
  font-family: 'Inter', sans-serif;
}

h1 {
    font-family: 'Calibri', sans-serif;
    font-size: 3rem;
    font-weight:bolder;
}

h2, h3, h4 {
  font-family: 'Merriweather', serif;
}

p, li {
  font-family: 'Inter', sans-serif;
  font-size: 1.05rem;
}

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

a:hover {
  color: var(--accent-hover);
  text-decoration: underline;
}

a.active {
  background-color: var(--accent) !important;
}

.card {
  background-color: var(--bg-main);
  border: 1px solid var(--border-color);
  border-radius: 0.5rem;
  padding: 1.5rem;
  box-shadow: var(--shadow-soft);
}

.card-title {
  font-family: 'Merriweather', serif;
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

.card-body {
  padding: 2rem;
}

.card-body li {
  margin-bottom: 0.5rem;
}

.list-group-item {
  background-color:  var(--bg-main) ;
}

.navbar.bg-custom {
  background-color: var(--nav-bg);
}

footer {
  background-color: var(--footer-bg);
  color: var(--text-muted);
  padding: 2rem 1rem;
  text-align: center;
  font-size: 0.9rem;
}

.visually-hidden-focusable:focus {
  position: static !important;
  display: inline-block;
  clip: auto;
  width: auto;
  height: auto;
}