body { font-family: sans-serif; max-width: 700px; margin: auto; }
.article-preview { border-bottom: 1px solid #ccc; margin-bottom: 1em; padding-bottom: 1em; }
.article-preview img { max-width: 100%; height: auto; }
.gallery img { max-width: 100px; margin: 5px; }
.content { margin-top: 2em; }

body { font-family: sans-serif; line-height: 1.6; padding: 20px; max-width: 800px; margin: auto; }
img.thumb { width: 200px; margin: 5px; cursor: pointer; border: 1px solid #ccc; }
.modal {
  display: none;
  position: fixed;
  z-index: 10;
  left: 0; top: 0;
  width: 100%; height: 100%;
  background: rgba(0,0,0,0.8);
  text-align: center;
}
.modal img {
  max-width: 90vw;
  max-height: 90vh;
  margin-top: 5%;
}
.modal .nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  font-size: 3em;
  color: white;
  cursor: pointer;
  user-select: none;
}
#prev { left: 10px; }
#next { right: 10px; }