body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  background: #f5f5f5;
  color: #333;
}

header {
  background: #0077cc;
  padding: 1rem;
  color: #fff;
  text-align: center;
}

nav a {
  margin: 0 10px;
  color: #fff;
  text-decoration: none;
  font-weight: bold;
}

main {
  padding: 2rem;
}

input {
  padding: 0.6rem;
  margin: 0.5rem 0;
  width: 90%;
  border: 1px solid #ccc;
  border-radius: 5px;
}

button {
  padding: 0.7rem 1.5rem;
  background: #28a745;
  color: white;
  border: none;
  border-radius: 5px;
  cursor: pointer;
}

button:hover {
  background-color: #218838;
}

.course-list {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
}

.course-card {
  background: white;
  padding: 1rem;
  border: 1px solid #ddd;
  width: 250px;
  border-radius: 10px;
  box-shadow: 0 3px 10px rgba(0,0,0,0.1);
  text-align: center;
  transition: transform 0.3s;
}

.course-card:hover {
  transform: scale(1.05);
}

.video-wrapper {
  display: flex;
  justify-content: center;
  margin: 1rem 0;
}
.video-wrapper iframe {
  width: 90%;
  max-width: 900px;
  height: 500px;
  border-radius: 8px;
}
@media (max-width: 768px) {
  .video-wrapper iframe {
    width: 100%;
    height: 300px;
  }
}


.fade-in {
  animation: fadeIn 1s ease-in-out;
}

.slide-up {
  animation: slideUp 1s ease-in;
}

.slide-down {
  animation: slideDown 1s ease-in;
}

@keyframes fadeIn {
  from { opacity: 0; transform: scale(0.95); }
  to { opacity: 1; transform: scale(1); }
}

@keyframes slideUp {
  from { transform: translateY(20px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

@keyframes slideDown {
  from { transform: translateY(-20px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

.form-container {
  max-width: 400px;
  margin: 2rem auto;
  background: white;
  padding: 2rem;
  border-radius: 10px;
  box-shadow: 0 3px 10px rgba(0,0,0,0.1);
  text-align: center;
}
header {
  position: relative;
}

.logout-btn {
  position: absolute;
  top: 1rem;
  right: 1rem;
  padding: 0.5rem 1rem;
  background: #dc3545;
  color: white;
  border: none;
  border-radius: 5px;
  cursor: pointer;
}

.logout-btn:hover {
  background-color: #c82333;
}