* {
  box-sizing: border-box;
  font-family: "Poppins", sans-serif;
}

body {
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.upload-box {
  width: 320px;
  padding: 30px;
  background: #111;
  border-radius: 16px;
  text-align: center;
}

.upload-btn {
  position: relative;
  width: 100%;
  height: 55px;
  border-radius: 30px;
font-weight:bold;
  border: none;
  background: linear-gradient(135deg, #6a5cff, #00f2fe);
  color: white;
  font-size: 16px;
  cursor: pointer;
  overflow: hidden;
  transition: 0.3s;
}

.upload-btn:disabled {
  cursor: not-allowed;
}

.upload-btn span {
  position: relative;
  z-index: 2;
}

.progress {
  position: absolute;
  left: 0;
  top: 0;
  height: 100%;
  width: 0%;
  background: rgba(255,255,255,0.3);
  transition: width 0.2s;
}

.checkmark {
  display: none;
  font-size: 24px;
  animation: pop 0.5s ease forwards;
}

@keyframes pop {
  0% { transform: scale(0); }
  80% { transform: scale(1.2); }
  100% { transform: scale(1); }
}

.glow {
  animation: glow 1.5s infinite alternate;
}