* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #f4f4f9;
  color: #333;
  text-align: center;
}
header {
  background: linear-gradient(135deg, #2c3e50, #34495e);
  color: white;
  padding: 20px;
  display: flex;
  align-items: center;
  justify-content: flex-start;
  flex-wrap: wrap;
}
.logo-container {
  background: white;
  border-radius: 50%;
  width: 190px;
  height: 190px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-right: 20px;
  flex-shrink: 0;
}
.logo-container img {
  max-height: 160px;
  width: auto;
}
.divider {
  width: 3px;
  background: black;
  height: 70%;
  margin-right: 20px;
  }
.header-text {
  text-align: left;
  }
.header-text h1 {
  margin: 0;
  font-size: 2.5em;
}
.header-text p {
  margin: 5px 0 0;
  font-size: 1.2em;
}
main {
  padding: 20px;
}
.video-container {
  position: relative;
  max-width: 800px;
  margin: 20px auto;
  background: white;
  padding: 10px;
  border-radius: 10px;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}
iframe {
  width: 100%;
  height: 450px;
  border: none;
  border-radius: 10px;
}
footer {
  background: #2c3e50;
  color: white;
  padding: 15px;
  margin-top: 20px;
  text-align: center;
}
.previous-video {
  position: relative;
  margin-top: 25px;
  padding: 15px;
  background: rgba(0, 0, 0, 0.6);
  border: 2px solid rgba(255, 255, 255, 0.4);
  border-radius: 12px;
  color: white;
  max-width: 780px;
  margin-left: auto;
  margin-right: auto;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
}
.previous-video h3 {
  margin-top: 0;
  font-size: 1.3em;
  color: #f1f1f1;
}
.previous-video img {
  max-width: 100%;
  border-radius: 10px;
  transition: transform 0.25s ease;
  cursor: pointer;
  border: 1px solid rgba(255, 255, 255, 0.3);
}
.previous-video img:hover {
  transform: scale(1.03);
}
.previous-video p {
  margin: 8px 0 0;
  font-size: 1.05em;
  color: #e8e8e8;
}
.back-button {
  background: #2c3e50;
  color: white;
  border: none;
  padding: 10px 20px;
  border-radius: 8px;
  margin-top: 10px;
  cursor: pointer;
  transition: background 0.2s;
}
.back-button:hover {
  background: #1a242f;
 }
@media (max-width: 768px) {
  header { flex-direction: column; }
  .divider { display: none; }
  .header-text { text-align: center; margin-top: 10px; }
  .logo-container { width: 180px; height: 180px; margin: 0 0 10px 0; }
  .logo-container img { max-height: 150px; }
  .header-text h1 { font-size: 2em; }
}