body {
  margin: 0;
  font-family: "Segoe UI", sans-serif;
  background: linear-gradient(135deg, #dbeafe, #eef2ff);
  display: flex;
  flex-direction: column;
  height: 100vh;
}

header {
  background: rgba(59, 130, 246, 0.9);
  color: white;
  padding: 10px 0;
  text-align: center;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
  font-size: 1.4em;
  font-weight: bold;
  letter-spacing: 1px;
}

nav {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  background: rgba(255, 255, 255, 0.9);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
  padding: 10px 0;
  z-index: 10;
}

nav button {
  background: transparent;
  border: none;
  margin: 4px 15px;
  padding: 8px 15px;
  font-size: 1em;
  font-weight: 600;
  cursor: pointer;
  color: #1e3a8a;
  border-radius: 25px;
  transition: all 0.3s ease;
}

nav button:hover {
  background: #3b82f6;
  color: white;
  transform: scale(1.1);
}

nav button.active {
  background: #2563eb;
  color: white;
  box-shadow: 0 4px 10px rgba(37, 99, 235, 0.3);
}

main {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
  overflow: hidden;
  background: url("../background.jpg") center/cover no-repeat fixed;
}

iframe {
  width: 100%;
  height: 100%;
  border: none;
  background: transparent;
  opacity: 1;
  border-radius: 1px;
  box-shadow: 0 0 1px rgba(0, 0, 0, 0.2);
  transition: opacity 0.5s ease;
}

footer {
  text-align: center;
  padding: 10px;
  font-size: 0.9em;
  color: #475569;
  background: rgba(255, 255, 255, 0.8);
}