body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  line-height: 1.6;
  background: #fff;
  color: #000;
}

.container {
  max-width: 900px;
  padding: 1.5rem;
  margin: 0 auto;
}

h1, h2 {
  line-height: 1.3;
}

.responsive-img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 2rem auto;
}

blockquote {
  border-left: 4px solid #000;
  padding-left: 1rem;
  margin: 2rem 0;
  background: #f5f5f5;
  font-style: italic;
}

.author {
  display: block;
  margin-top: 0.5rem;
  font-weight: bold;
}

.video-wrapper {
  position: relative;
  width: 100%;
  padding-top: 56.25%;
  margin: 2rem 0;
}

.video-wrapper iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

footer {
  margin-top: 4rem;
  padding-top: 2rem;
  border-top: 2px solid #000;
  font-weight: bold;
}

@media (max-width: 600px) {
  .container {
    padding: 1rem;
  }
}