body {
  margin: 0;
  font-family: 'Segoe UI', sans-serif;
  background: #f1f3f7;
  color: #333;
  padding: 20px;
}

.compressor-container {
  max-width: 960px;
  margin: auto;
  background: #fff;
  padding: 30px;
  border-radius: 16px;
  box-shadow: 0 0 20px rgba(0,0,0,0.07);
}

.header-box {
  text-align: center;
  margin-bottom: 30px;
}

.header-box h1 {
  font-size: 32px;
  color: #1f2937;
  margin-bottom: 10px;
}

.header-box p {
  font-size: 16px;
  color: #4b5563;
  line-height: 1.6;
  max-width: 750px;
  margin: 0 auto;
}

.upload-area {
  border: 2px dashed #bbb;
  padding: 30px;
  text-align: center;
  border-radius: 10px;
  margin-bottom: 30px;
  cursor: pointer;
  background: #fdfdfd;
  transition: border-color 0.2s ease;
}

.upload-area:hover {
  border-color: #007bff;
}

.upload-area label {
  color: #007bff;
  font-weight: bold;
  cursor: pointer;
}

#fileInput {
  display: none;
}

.options-panel {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 35px;
}

input[type=range] {
  width: 100%;
}

button {
  padding: 12px;
  background: #007bff;
  color: white;
  border: none;
  font-weight: bold;
  font-size: 16px;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.2s ease;
}

button:hover {
  background: #0056b3;
}

select {
  padding: 10px;
  border-radius: 6px;
  border: 1px solid #ccc;
  font-size: 14px;
}

.preview-section {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  justify-content: center;
}

.image-block {
  flex: 1 1 45%;
  background: #f8f9fa;
  padding: 20px;
  border-radius: 10px;
  text-align: center;
  box-shadow: 0 0 10px rgba(0,0,0,0.05);
}

.image-block img {
  max-width: 100%;
  border-radius: 8px;
  margin-bottom: 10px;
}

.image-block h3 {
  margin-bottom: 10px;
  color: #2d3748;
}

.image-block p {
  font-size: 14px;
  color: #555;
}

#downloadBtn {
  display: inline-block;
  margin-top: 12px;
  padding: 10px 20px;
  background: #28a745;
  color: white;
  text-decoration: none;
  border-radius: 8px;
  transition: background 0.2s ease;
}

#downloadBtn:hover {
  background: #218838;
}

/* Mobile */
@media (max-width: 768px) {
  .image-block {
    flex: 1 1 100%;
  }

  .header-box h1 {
    font-size: 24px;
  }
}