body {
  text-align: center;
}
.container {
  max-width: 800px;
  margin: auto;
  padding: 25px;
  border-radius: 12px;
  min-height: 100vh;
}
h1 { color: #333; }
.drop-area {
  border: 2px dashed #777;
  border-radius: 10px;
  padding: 30px;
  background: #fafafa;
  cursor: pointer;
  transition: 0.3s;
}
.drop-area:hover { background: #f0f0f0; }
.browse-btn {
color: white;
padding: 10px 20px;
border-radius: 50px;
cursor: pointer;
display: inline-block;
margin-top: 10px;
background: #007bff linear-gradient(to bottom, #007bff, #003f0e);
}
.preview { margin-top: 20px; }
.preview img {
  max-width: 100%;
  border-radius: 8px;
  margin-bottom: 10px;
  outline: 1px solid #000;
}
.slider-wrap { margin: 10px 0; }
input[type="range"] { width: 100%; }
.buttons {
  display: flex;
  gap: 10px;
  justify-content: center;
  flex-wrap: wrap;
}
button {
  padding: 10px 16px;
  border: none;
  border-radius: 500px;
  background: #28a745 linear-gradient(to bottom, #28a745, #003f0e);
  color: white;
  font-weight: bold;
  cursor: pointer;
}
button.clear { background: #f56982 linear-gradient(to bottom, #f2395a, #b90c2b); }
.hidden { display: none; }