body {
  font-family: 'Poppins', sans-serif;
  background: linear-gradient(135deg, #141e30, #243b55);
  margin: 0;
  color: white;
}

#particles-js {
  position: fixed;
  width: 100%;
  height: 100%;
  z-index: -1;
}

.container {
  max-width: 500px;
  margin: 40px auto;
  padding: 25px;
  border-radius: 20px;
  background: rgba(255,255,255,0.05);
  backdrop-filter: blur(10px);
  text-align: center;
}

h1 {
  background: linear-gradient(90deg, #00f260, #0575e6);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.top-bar {
  display: flex;
  justify-content: space-between;
}

button {
  padding: 10px 16px;
  border-radius: 10px;
  border: none;
  cursor: pointer;
  margin: 8px;
  background: #00f260;
  box-shadow: 0 0 10px #00f260;
}

button:hover {
  box-shadow: 0 0 20px #00f260;
}

.hidden {
  display: none;
}

.progress-bar {
  width: 100%;
  height: 8px;
  background: rgba(255,255,255,0.2);
  margin: 15px 0;
}

#progress {
  height: 8px;
  width: 0%;
  background: yellow;
}

#options button {
  display: block;
  width: 80%;
  margin: 10px auto;
}

#gameOver {
  text-align: center;
  margin-top: 30px;
  font-size: 22px;
}

@media(max-width:600px){
  .container { width: 90%; }
}

.levels button.active {
  background: orange;
}

body {
  font-family: 'Poppins', sans-serif;
  background: linear-gradient(135deg, #141e30, #243b55);
  color: white;
  margin: 0;
}

#particles-js {
  position: fixed;
  width: 100%;
  height: 100%;
  z-index: -1;
}

.container {
  max-width: 500px;
  margin: 40px auto;
  padding: 25px;
  background: rgba(255,255,255,0.05);
  border-radius: 20px;
  text-align: center;
}

.top-bar {
  display: flex;
  justify-content: space-between;
}

button {
  padding: 10px 16px;
  border-radius: 10px;
  border: none;
  margin: 8px;
  cursor: pointer;
  background: #00f260;
}

#options button {
  display: block;
  width: 80%;
  margin: 10px auto;
  font-size: 18px;
}

.hidden { display: none; }

.progress-bar {
  width: 100%;
  height: 8px;
  background: #555;
  margin: 10px 0;
}

#progress {
  height: 8px;
  width: 0%;
  background: yellow;
}

@media(max-width:600px){
  .container { width: 90%; }
}