* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: Arial, sans-serif;
  background: #f5f7fb;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  min-height: 100vh;
  padding: 30px 10px;
}

.container {
  background: #fff;
  padding: 25px 30px;
  border-radius: 12px;
  box-shadow: 0 6px 20px rgba(0,0,0,0.1);
  max-width: 800px;
  width: 100%;
  text-align: center;
}

h1 {
  color: #333;
  margin-bottom: 10px;
}

.upload-box {
  border: 2px dashed #bbb;
  border-radius: 10px;
  padding: 25px;
  background: #fafafa;
  cursor: pointer;
  margin: 20px 0;
}

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

.upload-box p {
  color: #666;
}

.preview-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 15px;
  margin-top: 20px;
}

.preview-card {
  background: #fdfdfd;
  padding: 10px;
  border: 1px solid #eee;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

.preview-card img {
  max-width: 100%;
  border-radius: 4px;
}

.download-btn {
  display: inline-block;
  margin-top: 8px;
  padding: 6px 12px;
  background: #007bff;
  color: #fff;
  text-decoration: none;
  border-radius: 6px;
  font-size: 14px;
}

.download-btn:hover {
  background: #0056b3;
}

button {
  margin-top: 20px;
  padding: 12px 20px;
  background: #28a745;
  border: none;
  color: white;
  font-size: 16px;
  border-radius: 8px;
  cursor: pointer;
}

button:hover {
  background: #218838;
}