html, body {
  margin: 0;
  padding: 0;
}

body {
  margin: 10px;
  font-family: Arial, sans-serif;
  color: #111;
  background-color: #fafafa;
  line-height: 1.5;
}

header h1 {
  text-align: center;
  margin: 16px 0 10px;
}

nav {
  text-align: center;
  font-size: 1em;
  line-height: 1.4;
  margin: 0;
}
nav div {
  display: inline-block;
  margin: 0 40px;
  vertical-align: top;
}
nav a {
  text-decoration: none;
  color: #4B0082;
}
nav a:hover {
  text-decoration: underline;
}
nav span {
  display: block;
  font-size: 0.9em;
}

hr {
  border: 0;
  border-top: 1px solid #aaa;
  margin: 4px 0;
}

main {
  max-width: 960px;
  margin: 10px auto;
  padding: 0 8px;
}
main p {
  margin: 10px 0;
}

figure {
  text-align: center;
  margin: 14px auto;
}
figure img {
  display: block;
  margin: 10px auto 0;
  width: 820px;
  height: 320px;
}
figcaption {
  margin-top: 6px;
  font-size: 0.9em;
}
figcaption code {
  font-family: inherit;
  background: none;
}

ol, ul {
  margin: 10px 0;
}
.media-list {
  text-align: center;
  padding-left: 0;
  list-style: none;
}
.media-list li {
  margin: 8px 0;
}

iframe {
  display: block;
  margin: 10px auto;
  width: 560px;
  height: 315px;
  border: 0;
}

footer {
  text-align: center;
}
footer p {
  margin: 6px 0;
}

.photo-grid {
  margin: 0 auto;
  border: 1px solid #000;
  border-collapse: collapse;
  table-layout: fixed;
  width: 720px;
}
.photo-grid td {
  padding: 6px;
  width: 50%;
  height: 260px;
  vertical-align: middle;
}
.photo-grid img.responsive {
  width: 100%;
  height: 260px;
  object-fit: cover;
  display: block;
}
.photo-section {
  text-align: center;
  margin-bottom: 30px;
}
.section-divider {
  margin-top: 40px;
  margin-bottom: 25px;
}

.responsive {
  display: block;
  max-width: 100%;
  height: auto;
  margin: 0 auto;
}

.table-facts {
  width: 100%;
  max-width: 960px;
  margin: 12px auto;
  border-collapse: collapse;
  text-align: center;
}
.table-facts caption {
  font-weight: bold;
  margin-bottom: 6px;
}

.table-facts th,
.table-facts td {
  border: 1px solid #000;
  padding: 8px;
  text-align: center;
}
.table-facts th {
  background: #f4f4f4;
}
.table-facts tfoot td {
  text-align: center;
  font-size: 0.9em;
}
.table-facts .price {
  text-align: center;
}
.table-facts tfoot a {
  text-decoration: none;
  color: #4B0082;
}
.table-facts tfoot a:hover {
  text-decoration: underline;
}

.center {
  text-align: center;
}

img, iframe {
  max-width: 100%;
  height: auto;
  display: block;
}

iframe {
  aspect-ratio: 16 / 9;
}

@media (max-width: 768px) {
  nav div {
    display: block;
    margin: 8px 0;
  }
  main {
    margin: 8px auto;
    padding: 0 10px;
  }
  figure img {
    width: 100%;
    height: auto;
  }
  .photo-grid {
    width: 100%;
    table-layout: auto;
  }
  .table-facts {
    width: 100%;
    margin: 10px auto;
  }
}

@media (max-width: 550px) {
  header h1 {
    font-size: 1.4em;
  }
  nav {
    font-size: 0.95em;
  }
  body {
    margin: 6px;
    font-size: 1em;
  }
  .photo-grid, .photo-grid tr, .photo-grid td {
    display: block;
    width: 100%;
  }
  .photo-grid td {
    padding: 6px 0;
  }
  .table-facts th, .table-facts td {
    padding: 6px;
    font-size: 0.95em;
  }
}

@media (max-width: 550px) {
  .table-facts {
    display: block;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    min-width: 560px;
    white-space: nowrap;
  }
  .table-facts caption {
    display: table-caption;
  }
}