* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 16px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial;
  background: #f2f4f8;
  color: #222;
}

.app {
  max-width: 520px;
  margin: auto;
  background: #fff;
  border-radius: 14px;
  padding: 20px;
  box-shadow: 0 10px 25px rgba(0,0,0,.08);
}

h2 {
  text-align: center;
  margin-top: 0;
}

.upload {
  border: 2px dashed #bbb;
  border-radius: 12px;
  padding: 18px;
  text-align: center;
  cursor: pointer;
  transition: .2s;
}

.upload:hover {
  border-color: #2563eb;
  background: #f7fbff;
}

.upload input {
  display: none;
}

.upload span {
  display: block;
  font-size: 15px;
  color: #333;
}

.upload small {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  color: #888;
}

.status {
  margin-top: 14px;
  font-size: 14px;
}

pre {
  margin-top: 14px;
  padding: 14px;
  background: #0f172a;
  color: #e5e7eb;
  border-radius: 10px;
  font-size: 13px;
  overflow-x: auto;
  white-space: pre-wrap;
  word-break: break-word;
}

.success { color: #16a34a; }
.error { color: #dc2626; }

.footer {
  margin-top: 16px;
  text-align: center;
  font-size: 12px;
  color: #888;
}

.upload {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.upload span {
  white-space: nowrap;
}

.upload small {
  line-height: 1.4;
  margin-top: 6px;
}