body {
  font-family: Arial, sans-serif;
  text-align: center;
  background: #f0f0f0;
  margin: 0;
  padding: 20px;
}

#appTitle {
  margin: 0 auto 6px auto;
}

.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 10px;
}

input[type="file"] {
  width: 90%;
  max-width: 420px;
  margin-top: 8px;
}

.expiration-container {
  margin-top: 12px;
  margin-bottom: 12px;
  text-align: left;
  max-width: 420px;
  margin-left: auto;
  margin-right: auto;
}

.expiration-container label {
  display: block;
  font-weight: bold;
  margin-bottom: 4px;
}

.expiration-container select {
  width: 100%;
  padding: 6px;
  font-size: 14px;
  box-sizing: border-box;
}



.card {
  margin: 14px auto;
  background: #fff;
  padding: 12px;
  border-radius: 10px;
  box-shadow: 0 6px 18px rgba(0,0,0,0.06);
  display: inline-block;
  text-align: left;
  width: 90%;
  max-width: 480px;
  box-sizing: border-box;
}

.muted {
  color: #666;
  margin: 0 0 8px 0;
}

.row {
  display: flex;
  gap: 8px;
  justify-content: flex-end;
  margin-top: 10px;
}

.image-box {
  position: relative;
  display: inline-block;
  margin-top: 20px;
  background: #fff;
  padding: 10px;
  box-shadow: 0 6px 18px rgba(0,0,0,0.06);
  border-radius: 6px;
  overflow: hidden; /* ensure overlay/canvas cannot escape the image box */
}

#hiddenImage {
  max-width: 100%;
  height: auto;
  display: block;
  border-radius: 4px;
}

#scratchCanvas {
  position: absolute;
  top: 10px; /* account for padding in image-box */
  left: 10px;
  cursor: crosshair;
  touch-action: none; /* prevent browser gestures while drawing */
}

#linkDialog {
  margin-top: 20px;
  background: white;
  padding: 15px;
  border-radius: 10px;
  display: inline-block;
  text-align: center;
  width: 90%;
  max-width: 400px;
  box-sizing: border-box;
}

#generatedLink {
  width: 100%;
  padding: 8px;
  box-sizing: border-box;
  font-size: 14px;
}

button {
  margin: 5px;
  padding: 10px 16px;
  font-size: 14px;
  cursor: pointer;
}

/* Full-screen loading cover (dark) */
#loading {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.75); /* dark overlay */
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  text-align: center;
  padding: 20px;
  box-sizing: border-box;
}

.spinner {
  border: 6px solid rgba(255,255,255,0.2);
  border-top: 6px solid #fff;
  border-radius: 50%;
  width: 50px;
  height: 50px;
  animation: spin 1s linear infinite;
  margin-bottom: 15px;
}

#loading p, #loading #loadingText {
  color: #fff;
  margin: 0;
  font-size: 16px;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

@media (max-width: 480px) {
  #linkDialog {
    padding: 12px;
  }
  button {
    padding: 8px 12px;
    font-size: 13px;
  }
  #generatedLink {
    font-size: 13px;
  }
}