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

body {
  font-family: 'Cherry Cream Soda', serif;
  background-color: #f0f4f8;
  color: #333;
  line-height: 1.6;
  min-height: 100vh;
}

header {
  text-align: center;
  padding: 1.5rem 1rem;
  background-color: #4a90e2;
  color: #fff;
}

header h1 {
  font-size: clamp(1.75rem, 5vw, 2.5rem);
  font-weight: 600;
}

header p {
  font-size: clamp(0.9rem, 3vw, 1.1rem);
  margin-top: 0.5rem;
}

main {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1.5rem;
  padding: 1.5rem;
  max-width: 1200px;
  margin: 0 auto;
}

section {
  background-color: #fff;
  border-radius: 12px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  padding: 1.5rem;
  width: 100%;
  max-width: 500px;
}

h2 {
  font-size: clamp(1.4rem, 4vw, 1.8rem);
  font-weight: 600;
  margin-bottom: 1.25rem;
  color: #4a90e2;
}

.input-group {
  margin-bottom: 1.25rem;
}

input[type="text"] {
  width: 100%;
  padding: 0.75rem;
  border: 2px solid #ddd;
  border-radius: 8px;
  font-size: 1rem;
  transition: border-color 0.3s;
}

input[type="text"]:focus {
  border-color: #4a90e2;
  outline: none;
}

.color-picker {
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.color-picker label {
  font-size: 1rem;
}

.buttons {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
  flex-wrap: wrap;
}

button {
  padding: 0.75rem 1.25rem;
  border: none;
  border-radius: 8px;
  background-color: #4a90e2;
  color: #fff;
  font-size: 1rem;
  cursor: pointer;
  transition: all 0.3s;
  flex: 1 1 auto;
}

button:hover {
  background-color: #357abd;
  transform: translateY(-1px);
}

canvas {
  display: block;
  margin: 1.25rem auto;
  border: 2px solid #ddd;
  border-radius: 8px;
  max-width: 100%;
  height: auto;
  aspect-ratio: 1/1;
}

.file-input {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 1.5rem;
  border: 2px dashed #4a90e2;
  border-radius: 12px;
  cursor: pointer;
  transition: border-color 0.3s;
}

.file-input:hover {
  border-color: #357abd;
}

.upload-icon {
  width: 40px;
  height: 40px;
  margin-bottom: 0.5rem;
}

#fileInput {
  display: none;
}

#errorMessage, #ScanErrorMessage {
  color: #ff5555;
  margin-bottom: 1rem;
  text-align: center;
  font-size: 0.9rem;
}

#qrResult {
  margin-top: 1.25rem;
  padding: 1rem;
  background-color: #f8f9fa;
  border: 2px solid #ddd;
  border-radius: 8px;
  font-size: 1rem;
  color: #333;
}

#qrResult .controls {
  display: flex;
  gap: 0.75rem;
  margin-top: 1rem;
  flex-wrap: wrap;
}

#resultContent {
  word-break: break-word;
  line-height: 1.4;
}

footer {
  text-align: center;
  padding: 1.5rem;
  background-color: #4a90e2;
  color: #fff;
  margin-top: auto;
}

@media (max-width: 600px) {
  main {
    padding: 1rem;
    gap: 1rem;
  }
  
  section {
    padding: 1.25rem;
  }
  
  .buttons {
    flex-direction: column;
  }
  
  button {
    width: 100%;
  }
  
  .file-input {
    padding: 1rem;
  }
}