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

body {
  font-family: 'Poppins', sans-serif;
  background: #111;
  color: #fff;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  overflow: hidden;
}

.intro-screen {
  position: absolute;
  width: 90%;
  max-width: 500px;
  padding: 30px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 15px;
  backdrop-filter: blur(10px);
  box-shadow: 0px 4px 10px rgba(0, 0, 0, 0.3);
  text-align: center;
  animation: fadeIn 1s ease-in-out;
}

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

.intro-screen p {
  font-size: 18px;
  font-weight: 300;
  margin-bottom: 20px;
}

.intro-screen p span {
  font-weight: 600;
  color: #00ffcc;
}

#startButton {
  font-size: 18px;
  padding: 12px 20px;
  background: #00ffcc;
  color: #000;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-weight: bold;
  transition: all 0.3s ease;
  box-shadow: 0px 4px 10px rgba(0, 255, 204, 0.3);
}

#startButton:hover {
  background: #00cc99;
  transform: scale(1.05);
}

.hidden { display: none; }

.background-video {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  object-fit: cover;
  z-index: -1;
}