body {
  margin: 0;
  font-family: 'DM Sans', sans-serif;
  background: linear-gradient(135deg,#667eea,#764ba2);
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  color: #fff;
}

.app {
  width: 400px;
}

.card {
  background: rgba(255,255,255,0.1);
  backdrop-filter: blur(20px);
  padding: 30px;
  border-radius: 20px;
  box-shadow: 0 10px 40px rgba(0,0,0,0.3);
}

.logo {
  font-size: 1.8rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 20px;
}

.screen { display: block; }
.screen.hidden { display: none; }

button {
  cursor: pointer;
  border: none;
  border-radius: 10px;
  padding: 12px 20px;
  margin-top: 10px;
  background: #00ffcc;
  font-weight: bold;
  color: black;
  transition: all 0.2s;
}
button:hover { transform: scale(1.05); }

.progress-bar {
  height: 10px;
  background: rgba(255,255,255,0.2);
  border-radius: 10px;
  margin: 10px 0;
  overflow: hidden;
}
#progress-fill {
  width: 0%;
  height: 100%;
  background: linear-gradient(90deg,#00ffcc,#00ffff);
  transition: 0.3s;
}