@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@400;600&display=swap');
body {
  background-color: #121212;
  color: #ffcc00;
  font-family: 'Poppins', sans-serif;
  text-align: center;
  padding: 20px;
  overflow: hidden;
}
h1, h3 {
  font-weight: 600;
}
input, button {
  padding: 12px;
  font-size: 18px;
  margin: 10px;
  border-radius: 10px;
  border: none;
  outline: none;
  transition: all 0.3s ease;
}
input {
  background: #1e1e1e;
  color: #ffcc00;
  border: 1px solid #ffcc00;
  width: 80%;
}
input:focus {
  border-color: #ffaa00;
  box-shadow: 0 0 8px #ffaa00;
}
button {
  background: linear-gradient(45deg, #ff4d00, #ffcc00);
  color: #fff;
  font-weight: 600;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(255, 102, 0, 0.4);
}
button:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(255, 102, 0, 0.5);
}
.result, .history {
  font-size: 24px;
  margin-top: 20px;
}
.controls {
  margin-top: 20px;
}
.history-box {
  border: 1px solid #ffcc00;
  padding: 12px;
  margin-top: 10px;
  background: #1e1e1e;
  border-radius: 10px;
  word-break: break-all;
}
a button {
  width: 200px;
}
.footer {
  margin-top: 30px;
  font-size: 14px;
  color: #999;
}

/* Overlay */
.overlay {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background: rgba(0, 0, 0, 0.88);
  color: #fff;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}
.overlay input {
  width: 250px;
  text-align: center;
  margin-top: 20px;
}
.overlay button {
  margin-top: 10px;
  width: 150px;
}
.error-msg {
  color: red;
  margin-top: 10px;
  font-size: 14px;
  display: none;
}

.notification {
  position: fixed;
  bottom: 30px;
  right: 30px;
  background: linear-gradient(45deg, #ff4d00, #ffcc00);
  color: #fff;
  padding: 16px 24px;
  border-radius: 12px;
  box-shadow: 0 4px 12px rgba(255, 102, 0, 0.5);
  opacity: 0;
  transform: translateY(100px);
  transition: opacity 0.4s ease, transform 0.4s ease;
  z-index: 9999;
  font-size: 16px;
  pointer-events: none;
}
.notification.show {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}