* {
  margin: 0;
  padding: 0;
  font-family: 'Poppins', sans-serif;
  box-sizing: border-box;
}

body {
  background: #262a2f;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
}

.container {
  width: 400px;
  padding: 25px 35px;
  background: #fff;
  border-radius: 10px;
}

.container p {
  font-size: 16px;
  font-weight: 500;
  color: #333;
  margin-bottom: 15px;
  text-align: center;
}

.container input {
  width: 100%;
  height: 50px;
  border: 1px solid #494eea;
  outline: 0;
  padding: 10px;
  margin: 10px 0 20px;
  border-radius: 5px;
  font-size: 14px;
}

.container button {
  width: 100%;
  height: 50px;
  background-color: #494eea;
  color: #fff;
  border: 0;
  outline: 0;
  border-radius: 5px;
  box-shadow: 0 10px 10px rgba(0, 0, 0, 0.1);
  cursor: pointer;
  margin: 20px 0;
  font-weight: 500;
  font-size: 16px;
}

#imgBox {
  width: 200px;
  border-radius: 5px;
  max-height: 0;
  overflow: hidden;
  transition: max-height 1s;
  margin: 0 auto;
}

#imgBox img {
  width: 100%;
  padding: 10px;
}

#imgBox.show-img {
  max-height: 300px;
  margin: 10px auto;
  border: 1px solid #d1d1d1;
}

.error {
  animation: shake 0.1s linear 10;
  border-color: #ff4d4d;
}

@keyframes shake {
  0% { transform: translateX(0); }
  25% { transform: translateX(-2px); }
  50% { transform: translateX(0); }
  75% { transform: translateX(2px); }
  100% { transform: translateX(0); }
}

/* Responsive Design */
@media (max-width: 450px) {
  .container {
    width: 90%;
    padding: 20px 25px;
  }

  .container p {
    font-size: 14px;
  }

  .container input {
    height: 45px;
    font-size: 13px;
  }

  .container button {
    height: 45px;
    font-size: 14px;
  }

  #imgBox {
    width: 150px;
  }

  #imgBox.show-img {
    max-height: 250px;
  }
}

@media (max-width: 300px) {
  .container {
    padding: 15px 20px;
  }

  #imgBox {
    width: 120px;
  }

  #imgBox.show-img {
    max-height: 200px;
  }
}