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

body, html {
  height: 100%;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: #f7f8fa;
}

header {
  background-color: white;
  padding: 10px 20px;
  box-shadow: 0 2px 5px rgba(0,0,0,0.1);
  display: flex;
  align-items: center;
}

header img {
  height: 40px;
}

main {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: calc(100% - 70px);
  padding: 20px;
  text-align: center;
}

h1 {
  margin-bottom: 30px;
  color: #333;
}

.button-group {
  display: flex;
  gap: 20px;
}

.btn {
  text-decoration: none;
  background-color: #ff4081;
  color: white;
  padding: 15px 30px;
  border-radius: 8px;
  font-size: 16px;
  transition: background-color 0.3s ease;
}

.btn:hover {
  background-color: #e0356b;
}

.iframe-full {
  width: 100%;
  height: calc(100vh - 70px);
  border: none;
}