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

body {
  font-family: Arial, sans-serif;
  background: #f4f6f8;
  color: #222;
  padding: 40px 20px;
}

.container {
  max-width: 900px;
  margin: 0 auto;
}

h1 {
  font-size: 42px;
  margin-bottom: 10px;
}

.subtitle {
  color: #666;
  margin-bottom: 20px;
}

input[type="file"] {
  margin-bottom: 20px;
  padding: 10px;
}

.quality-selector {
  margin-bottom: 30px;
}

.quality-selector label {
  margin-right: 10px;
  font-weight: bold;
}

.quality-selector select {
  padding: 8px 12px;
  border-radius: 6px;
  border: 1px solid #ccc;
}

.page-container {
  background: #fff;
  border-radius: 12px;
  padding: 20px;
  margin-bottom: 30px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
}

.page-container h3 {
  margin-bottom: 15px;
}

.page-container img {
  width: 100%;
  border: 1px solid #ddd;
  border-radius: 8px;
  margin-bottom: 15px;
}

.download-btn {
  display: inline-block;
  text-decoration: none;
  background: #111827;
  color: white;
  padding: 10px 16px;
  border-radius: 8px;
  transition: 0.2s ease;
}

.download-btn:hover {
  opacity: 0.9;
}

.error {
  color: red;
  font-weight: bold;
}