* {
	margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: Arial, sans-serif;
}

body {
  background-color: #1a1a1a;
  min-height: 100vh;
  margin: 0;
}

.main-nav {
  background: #1a1a1a;
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid #333;
}

.nav-brand {
  color: #fff;
  font-size: 1.2rem;
  font-weight: bold;
}

.nav-link {
  color: #4CAF50;
  text-decoration: none;
  padding: 0.5rem 1rem;
  transition: opacity 0.3s;
}

.nav-link:hover {
  opacity: 0.8;
}

.exercise {
  position: relative;
  height: 90vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.exercise::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(to right, rgba(0,0,0,0.2) 0%, rgba(0,0,0,0.1) 50%, rgba(0,0,0,0) 100%);
  z-index: 1;
}

.exercise-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.exercise-content {
  position: absolute;
  text-align: left;
  color: #fff;
  z-index: 2;
  max-width: 800px;
  padding: 2rem;
  left: 10%;
  top: 20%;
  transform: translateY(-50%);
}

footer {
  background-color: #1a1a1a;
  color: #fff;
  text-align: center;
  padding: 1rem;
  font-size: 0.8rem;
}

.video-container iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: none;
}

@media (max-width: 768px) {
  .exercise-content p {
    font-size: 2rem;
  }
  .exercise-content {
    top: 30%;
  }
}