* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", sans-serif;
  background: #f5f7f8;
  color: #162027;
}
main {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}
.panel {
  width: min(720px, 100%);
  background: white;
  border: 1px solid #dbe2e6;
  border-radius: 8px;
  padding: 28px;
  box-shadow: 0 16px 40px rgba(17, 35, 50, .08);
}
h1 { margin: 0 0 24px; font-size: 24px; font-weight: 650; }
form { display: grid; grid-template-columns: 1fr auto; gap: 12px; align-items: center; }
input[type=file] {
  width: 100%;
  border: 1px solid #cfd9df;
  border-radius: 6px;
  padding: 10px;
  background: #fbfcfc;
}
button, .download {
  border: 0;
  border-radius: 6px;
  padding: 11px 16px;
  background: #175cd3;
  color: white;
  font-size: 15px;
  text-decoration: none;
  cursor: pointer;
  white-space: nowrap;
}
button:disabled { opacity: .55; cursor: not-allowed; }
.status { margin-top: 24px; }
.row { display: flex; justify-content: space-between; gap: 16px; margin-bottom: 8px; font-size: 14px; }
.bar { height: 10px; border-radius: 999px; background: #e6ecef; overflow: hidden; }
#bar { width: 0%; height: 100%; background: #2e7d32; transition: width .25s ease; }
.download { display: inline-block; margin-top: 16px; }
.error { color: #b42318; margin: 14px 0 0; white-space: pre-wrap; }
.hidden { display: none; }
@media (max-width: 620px) {
  form { grid-template-columns: 1fr; }
  .panel { padding: 20px; }
}