/* Hero Section */
.hero {
  position: relative;
  width: 100%;
  height: 400px; /* adjust as needed */
  overflow: hidden;
}

.hero_img {
  width: 100%;
  height: 100%;
  object-fit: cover; /* image covers entire header area */
}

.hero_text {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: white;
  text-align: center;
  text-shadow: 2px 2px 6px rgba(0,0,0,0.7);
}

.paper_title {
  font-size: 2rem;
  font-weight: bold;
  margin: 0;
}

/* Authors below header */
.authors_container {
  text-align: left;
  margin-left: 15px;
}

.authors_names, .year {
  font-size: 1rem;
  margin: 0;
}

/* Buttons */
.button_group .btn {
  margin-right: 10px;
  margin-bottom: 10px;
}

/* Main text */
p {
  line-height: 1.6;
}