/* Reset básico */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Segoe UI', sans-serif;
  background: #f0f4f8;
  color: #333;
  padding: 20px;
}

header {
  text-align: center;
  margin-bottom: 30px;
}

header h1 {
  font-size: 2.5rem;
  color: #007acc;
}

header p {
  font-size: 1.2rem;
  color: #555;
}

main {
  max-width: 900px;
  margin: 0 auto;
}

section {
  margin-bottom: 40px;
}

h2 {
  font-size: 1.8rem;
  margin-bottom: 15px;
  color: #005a9e;
}

ul {
  list-style-type: none;
}

ul li {
  margin-bottom: 10px;
  background: #fff;
  padding: 10px;
  border-radius: 8px;
  box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

ul li a {
  color: #007acc;
  text-decoration: none;
  font-weight: bold;
}

ul li a:hover {
  text-decoration: underline;
}

#video-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
}

iframe {
  width: 100%;
  height: 200px;
  border: none;
  border-radius: 8px;
}

footer {
  text-align: center;
  margin-top: 50px;
  font-size: 0.9rem;
  color: #777;
}