:root {
  --cyan: #41adf0;
  --white: #ffffff;
  --dark: #0f487a;
  --light-cyan: #a6d5f7;
  --font-main: 'Roboto', sans-serif;
}
body {
  margin: 0;
  font-family: var(--font-main);
  background-color: var(--white);
  color: var(--dark);
}
header {
  background-color: var(--cyan);
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
  border-bottom: 2px solid var(--light-cyan);
}
nav a {
  color: var(--white);
  text-decoration: none;
  font-weight: bold;
}
.section {
  padding: 3rem 2rem;
  text-align: center;
}
h2 {
  font-size: 2rem;
  color: var(--cyan);
  margin-bottom: 2rem;
}
.video-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  max-width: 800px;
  margin: 0 auto;
}
.video-wrapper {
  position: relative;
  padding-bottom: 56.25%;
  height: 0;
  overflow: hidden;
}
.video-wrapper iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}
footer {
  text-align: center;
  padding: 2rem;
  background-color: var(--light-cyan);
}
.cover {
  width: 100%;
  height: auto;
  margin-top: 2rem;
}
.btn {
  display: inline-block;
  margin-top: 1rem;
  background-color: var(--cyan);
  color: var(--white);
  padding: 0.5rem 1rem;
  border: none;
  border-radius: 5px;
  font-weight: bold;
  text-decoration: none;
}