:root {
  --primary: #1e3a8a;
  --accent: #10b981;
  --light: #f9fafb;
  --dark: #111827;
}

body {
  margin: 0;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: var(--light);
  color: var(--dark);
}

header {
  background-color: var(--primary);
  color: white;
  padding: 1rem;
  text-align: center;
}

.profile-photo {
  margin-top: 1rem;
}

.profile-photo img {
  width: 200px;
  height: 200px;
  object-fit: cover;
  border-radius: 50%;
  border: 4px solid white;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

nav {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  background-color: var(--dark);
  padding: 0.5rem;
}

nav a {
  color: white;
  text-decoration: none;
  font-weight: bold;
}

section {
  padding: 1rem 1rem;
  max-width: 900px;
  margin: auto;
}

h2 {
  color: var(--primary);
  margin-bottom: 1rem;
}

.video-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

iframe {
  width: 100%;
  height: 315px;
  border: none;
}

@media (min-width: 600px) {
  .video-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

footer {
  background-color: var(--dark);
  color: white;
  text-align: center;
  padding: 1rem;
}