body {
  font-family: sans-serif;
  background: #f0f2f5;
  display: flex;
  justify-content: center;
  padding: 2em;
}

.container {
  background: #fff;
  padding: 2em;
  border-radius: 10px;
  box-shadow: 0 4px 10px rgba(0,0,0,0.1);
  max-width: 500px;
  width: 100%;
  text-align: center;
}

h1 {
  font-size: 2em;
  margin-bottom: 0.2em;
}

h2 {
  font-size: 1.1em;
  color: #555;
  margin-bottom: 1.5em;
}

.upload-section {
  display: flex;
  flex-direction: column;
  gap: 1em;
  margin-bottom: 1em;
}

.dropzone {
  border: 2px dashed #aaa;
  border-radius: 6px;
  padding: 1.8em;
  cursor: pointer;
  transition: border-color 0.2s, background-color 0.2s;
  position: relative;
  background: #fafafa;
}

.dropzone.dragover {
  border-color: #0078d4;
  background-color: #eef6ff;
}

.dropzone p {
  margin: 0;
  font-size: 1.05em;
  color: #444;
}

.dropzone input[type="file"] {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}

.notice {
  background: #fff3cd;
  color: #856404;
  border: 1px solid #ffeeba;
  padding: 1em;
  font-size: 0.9em;
  border-radius: 6px;
  margin-bottom: 1.2em;
  text-align: left;
}

button {
  background-color: #0078d4;
  color: white;
  border: none;
  padding: 0.7em 1.4em;
  font-size: 1em;
  border-radius: 4px;
  cursor: pointer;
}

button:hover {
  background-color: #005fa3;
}

#status {
  margin-top: 1em;
  font-size: 0.95em;
  color: #555;
}