body {
  font-family: 'Poppins', sans-serif;
  background: linear-gradient(135deg, #0f2027, #203a43, #2c5364);
  color: #fff;
  margin: 0;
  padding: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

nav {
  display: flex;
  justify-content: center;
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(6px);
  padding: 10px;
  position: sticky;
  top: 0;
  z-index: 1000;
}

nav button {
  background: none;
  border: none;
  padding: 10px 20px;
  margin: 0 10px;
  color: #fff;
  font-size: 1rem;
  cursor: pointer;
  border-radius: 10px;
  transition: 0.3s;
}
nav button:hover, nav button.active {
  background: #00c6ff;
  color: #fff;
}

h1 {
  margin: 20px;
  text-align: center;
  font-size: 2rem;
}

.content {
  flex: 1;
  display: none;
  justify-content: center;
  align-items: center;
  padding: 30px;
}

.card {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(8px);
  border-radius: 20px;
  padding: 20px;
  text-align: center;
  box-shadow: 0 8px 20px rgba(0,0,0,0.2);
  width: 320px;
}

.time {
  font-size: 2rem;
  font-weight: bold;
  margin: 15px 0;
}

button, select, input {
  padding: 10px 15px;
  margin: 5px;
  border: none;
  border-radius: 10px;
  font-size: 1rem;
}

button {
  background: #00c6ff;
  color: #fff;
  cursor: pointer;
  transition: 0.3s;
}
button:hover {
  background: #0072ff;
}

select {
  background: #fff;
  color: #333;
}