body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  line-height: 1.6;
  background: #fdfdfd;
  color: #333;
}

/* Sticky navbar */
.navbar {
  position: sticky;
  top: 0;
  background: #333;
  padding: 10px 0;
  z-index: 1000;
}

.navbar ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  justify-content: center;
}

.navbar li {
  margin: 0 15px;
}

.navbar a {
  color: #fff;
  text-decoration: none;
  font-weight: bold;
  padding: 6px 10px;
  border-radius: 4px;
  transition: background 0.2s;
}

.navbar a:hover,
.navbar a.active {
  background: #555;
}

main {
  max-width: 900px;
  margin: 40px auto;
  padding: 0 20px;
}

h2 {
  border-bottom: 2px solid #ccc;
  padding-bottom: 5px;
  margin-top: 0;
}

/* ========================
   Sekcja Publications
   ======================== */
#pubs-container {
  display: none;        /* ukryta na start */
  max-width: 900px;     /* jak main */
  margin: 40px auto;    /* jak main */
  padding: 0 20px;      /* jak main */
}