/* Reset & base */
* {
  box-sizing: border-box;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  margin: 0;
  background: linear-gradient(135deg, #6a11cb 0%, #2575fc 100%);
  color: #fff;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 20px;
}

/* Container */
.container {
  background: #fff;
  color: #333;
  max-width: 600px;
  width: 100%;
  border-radius: 20px;
  padding: 30px 40px;
  box-shadow:
    0 4px 6px rgba(0, 0, 0, 0.1),
    0 10px 20px rgba(101, 70, 255, 0.2);
  text-align: center;
}

/* Heading */
h1 {
  font-weight: 700;
  font-size: 2.8rem;
  margin-bottom: 20px;
  background: linear-gradient(90deg, #6a11cb, #2575fc);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Drop area */
#drop-area {
  border: 3px dashed #6a11cb;
  border-radius: 15px;
  background: #f5f7ff;
  padding: 40px 20px;
  margin-bottom: 25px;
  cursor: pointer;
  transition: background-color 0.3s ease, border-color 0.3s ease;
  color: #6a11cb;
  font-weight: 600;
  font-size: 1.2rem;
  user-select: none;
}

#drop-area.dragover {
  background-color: #dbe4ff;
  border-color: #2575fc;
  color: #2575fc;
}

#drop-area p {
  margin: 0;
}

#select-files {
  background: #6a11cb;
  border: none;
  color: #fff;
  padding: 10px 18px;
  border-radius: 10px;
  font-weight: 700;
  font-size: 1rem;
  margin-left: 10px;
  transition: background 0.3s ease;
}

#select-files:hover {
  background: #2575fc;
}

/* Select dropdowns */
select {
  width: 100%;
  padding: 12px 15px;
  margin: 10px 0 25px 0;
  border-radius: 12px;
  border: 2px solid #6a11cb;
  background: #f5f7ff;
  font-weight: 600;
  font-size: 1rem;
  color: #333;
  transition: border-color 0.3s ease;
  appearance: none;
  background-image:
    linear-gradient(45deg, transparent 50%, #6a11cb 50%),
    linear-gradient(135deg, #6a11cb 50%, transparent 50%);
  background-position:
    calc(100% - 20px) calc(1em + 2px),
    calc(100% - 15px) calc(1em + 2px);
  background-size: 5px 5px;
  background-repeat: no-repeat;
  cursor: pointer;
}

select:focus {
  outline: none;
  border-color: #2575fc;
}

/* Process button */
#processBtn {
  background: linear-gradient(90deg, #6a11cb, #2575fc);
  border: none;
  padding: 15px 0;
  border-radius: 15px;
  font-weight: 700;
  font-size: 1.25rem;
  color: white;
  width: 100%;
  cursor: pointer;
  transition: background 0.3s ease;
  box-shadow: 0 4px 15px rgba(101, 70, 255, 0.5);
}

#processBtn:hover {
  background: linear-gradient(90deg, #2575fc, #6a11cb);
}

/* Progress bar */
progress {
  width: 100%;
  height: 20px;
  border-radius: 15px;
  overflow: hidden;
  margin-top: 20px;
  appearance: none;
  -webkit-appearance: none;
}

progress::-webkit-progress-bar {
  background-color: #e0e0e0;
}

progress::-webkit-progress-value {
  background: linear-gradient(90deg, #6a11cb, #2575fc);
  border-radius: 15px;
}

/* Download buttons container */
#downloadContainer {
  margin-top: 30px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
}

/* Download buttons */
.download-button {
  background: linear-gradient(90deg, #2575fc, #6a11cb);
  padding: 12px 25px;
  border-radius: 50px;
  color: white;
  font-weight: 700;
  text-decoration: none;
  box-shadow: 0 4px 15px rgba(37, 117, 252, 0.7);
  transition: background 0.3s ease;
  user-select: none;
}

.download-button:hover {
  background: linear-gradient(90deg, #6a11cb, #2575fc);
}

/* Responsive */
@media (max-width: 640px) {
  .container {
    padding: 25px 20px;
  }

  h1 {
    font-size: 2rem;
  }
}