body {
  margin: 0;
  font-family: 'Poppins', sans-serif;
  background-color: #0a0a0a;
  color: white;
}
.header {
  text-align: center;
  padding: 2rem;
}
.logo {
  color: #1e90ff;
  font-size: 2rem;
}
.sign-in {
  background: linear-gradient(90deg, #1e90ff, #00bfff);
  border: none;
  padding: 10px 20px;
  border-radius: 10px;
  color: white;
  cursor: pointer;
}
.hero img {
  width: 100%;
  max-width: 500px;
  border-radius: 20px;
  box-shadow: 0 0 20px #00bfff;
}
.features {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem;
  padding: 2rem;
}
.feature {
  background: rgba(255,255,255,0.05);
  border-radius: 12px;
  padding: 1rem 2rem;
  font-weight: bold;
  text-align: center;
}
.modal {
  display: none;
  position: fixed;
  z-index: 1000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.7);
  justify-content: center;
  align-items: center;
}
.modal-content {
  background: #111;
  border-radius: 20px;
  padding: 2rem;
  width: 90%;
  max-width: 400px;
  text-align: center;
  box-shadow: 0 0 20px #00bfff;
}
.subtext {
  color: #888;
  font-size: 0.9rem;
  margin-top: -10px;
}
.error-text {
  color: red;
  font-size: 0.9rem;
  height: 20px;
}
.confirm-btn, .yes-btn, .no-btn {
  background: linear-gradient(90deg, #1e90ff, #00bfff);
  border: none;
  border-radius: 10px;
  padding: 10px 20px;
  color: white;
  cursor: pointer;
  margin-top: 10px;
}
.no-btn {
  background: #333;
}
.avatar {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  margin-bottom: 1rem;
  box-shadow: 0 0 10px #00bfff;
}
.buttons {
  display: flex;
  justify-content: center;
  gap: 1rem;
}
@media (max-width: 600px) {
  .feature { width: 90%; }
}