body {
  font-family: "Inter", sans-serif;
  background: linear-gradient(180deg, #f7faff 0%, #eef3f9 100%);
  color: #333;
  margin: 0;
  padding: 0;
}

header {
  text-align: center;
  padding: 40px 20px 10px;
  color: #0078ff;
}

header p {
  color: #555;
}

.upload-area {
  background: white;
  border: 2px dashed #0078ff;
  border-radius: 16px;
  text-align: center;
  padding: 50px;
  margin: 30px auto;
  max-width: 600px;
  transition: all 0.3s ease;
  cursor: pointer;
}

.upload-area:hover {
  background: #f0f7ff;
}

.hidden {
  display: none;
}

.global-settings {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 20px;
  margin: 20px;
  align-items: center;
}

.global-settings label {
  font-weight: 500;
}

.global-settings input[type="range"] {
  vertical-align: middle;
  margin: 0 8px;
}

.preview-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 20px;
  margin: 30px;
}

.image-card {
  background: white;
  border-radius: 12px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
  overflow: hidden;
  padding: 12px;
  text-align: center;
  transition: transform 0.2s;
}

.image-card:hover {
  transform: scale(1.03);
}

.image-card img {
  width: 100%;
  border-radius: 8px;
}

.progress {
  height: 6px;
  background: #e0e0e0;
  border-radius: 6px;
  overflow: hidden;
  margin-top: 6px;
}

.progress-bar {
  height: 100%;
  background: #0078ff;
  width: 0%;
  transition: width 0.3s;
}

footer {
  text-align: center;
  padding: 20px;
  color: #777;
  font-size: 14px;
}
.back-nav {
  padding: 12px 20px;
  background: #f3f8ff;
  border-bottom: 1px solid #d7e5ff;
}

.back-nav a {
  color: #0078ff;
  text-decoration: none;
  font-weight: 600;
  transition: color 0.2s ease;
}

.back-nav a:hover {
  color: #005dcc;
}