* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: "Trebuchet MS", Verdana, sans-serif;
  background: #f4f4f4;
  color: #4a4a4a;
}

main {
  width: min(480px, 92vw);
  background: #fff;
  border: 1px solid #dcdcdc;
  border-radius: 10px;
  padding: 36px 32px;
  text-align: center;
}

h1 { font-size: 22px; margin: 0 0 6px; color: #6a6a6a; }

.sottotitolo { margin: 0 0 24px; font-size: 14px; color: #828282; }

.zona {
  border: 2px dashed #cecece;
  border-radius: 8px;
  padding: 40px 20px;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
  font-size: 14px;
  color: #828282;
}

.zona.attiva,
.zona:hover { border-color: #8a8a8a; background: #fafafa; }

.errore { margin-top: 16px; color: #b3261e; font-size: 13px; }

.stato { margin-top: 16px; color: #828282; font-size: 13px; }