*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --c-primario:     #0ea5e9;
  --c-primario-dark:#0284c7;
  --c-sfondo:       #f0f4f8;
  --c-superficie:   #ffffff;
  --c-testo:        #1e293b;
  --c-testo-muted:  #64748b;
  --c-bordo:        #e2e8f0;
  --c-errore:       #dc2626;
  --c-errore-bg:    #fef2f2;
  --raggio:         10px;
  --ombra:          0 4px 24px rgba(0,0,0,.10);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--c-sfondo);
  color: var(--c-testo);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.schermata {
  width: 100%;
  padding: 24px;
  display: flex;
  justify-content: center;
}

.card {
  background: var(--c-superficie);
  border-radius: var(--raggio);
  box-shadow: var(--ombra);
  padding: 48px 40px;
  width: 100%;
  max-width: 380px;
  text-align: center;
}

.logo {
  font-size: 56px;
  line-height: 1;
  margin-bottom: 12px;
}

.titolo {
  font-size: 32px;
  font-weight: 700;
  letter-spacing: -0.5px;
  color: #0d1b2a;
}

.sottotitolo {
  font-size: 13px;
  color: var(--c-testo-muted);
  text-transform: uppercase;
  letter-spacing: 0.6px;
  margin-top: 4px;
  margin-bottom: 32px;
}

.campo {
  text-align: left;
  margin-bottom: 16px;
}

.campo label {
  display: block;
  font-size: 13px;
  font-weight: 500;
  color: var(--c-testo);
  margin-bottom: 6px;
}

.campo input {
  width: 100%;
  padding: 10px 12px;
  border: 1.5px solid var(--c-bordo);
  border-radius: 6px;
  font-size: 15px;
  color: var(--c-testo);
  background: var(--c-superficie);
  transition: border-color .15s;
  outline: none;
}

.campo input:focus {
  border-color: var(--c-primario);
  box-shadow: 0 0 0 3px rgba(14,165,233,.15);
}

.errore {
  background: var(--c-errore-bg);
  color: var(--c-errore);
  border: 1px solid #fecaca;
  border-radius: 6px;
  padding: 10px 14px;
  font-size: 13px;
  text-align: left;
  margin-bottom: 16px;
}

button[type="submit"] {
  width: 100%;
  padding: 12px;
  background: var(--c-primario);
  color: white;
  border: none;
  border-radius: 6px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  margin-top: 4px;
  transition: background .15s;
}

button[type="submit"]:hover {
  background: var(--c-primario-dark);
}

button[type="submit"]:disabled {
  opacity: .6;
  cursor: not-allowed;
}