/* ============================================================
   Calcolo Codice Fiscale — stile ispirato all'Agenzia delle Entrate
   Palette istituzionale: blu #0066cc, blu scuro #003366, grigi.
   ============================================================ */
:root {
  --blu: #0066cc;
  --blu-scuro: #003366;
  --blu-chiaro: #e6f0fa;
  --verde: #009246;
  --rosso: #ce2b37;
  --grigio-bg: #f4f6f8;
  --grigio-bordo: #d6dce2;
  --testo: #1b1b1b;
  --testo-soft: #55606b;
  --radius: 6px;
  --ombra: 0 2px 8px rgba(0, 40, 90, 0.08);
}

* { box-sizing: border-box; }
/* L'attributo hidden deve avere sempre la precedenza (altrimenti display:flex
   su .install-banner lo rende sempre visibile). */
[hidden] { display: none !important; }

body {
  margin: 0;
  font-family: "Titillium Web", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  color: var(--testo);
  background: var(--grigio-bg);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

.container { width: 100%; max-width: 860px; margin: 0 auto; padding: 0 16px; }

a { color: var(--blu); }

/* ---------- HEADER ---------- */
.site-header { background: #fff; box-shadow: var(--ombra); border-bottom: 3px solid var(--blu); }

.flag {
  display: inline-flex; width: 46px; height: 32px; flex: none;
  border: 1px solid var(--grigio-bordo); border-radius: 3px; overflow: hidden;
}
.flag span { display: block; width: 33.33%; height: 100%; }
.flag-green { background: var(--verde); }
.flag-white { background: #fff; }
.flag-red { background: var(--rosso); }

.header-main-inner { display: flex; align-items: center; padding: 16px; }
.brand { display: flex; align-items: center; gap: 14px; }

/* Banner installazione PWA (sopra l'header) */
.install-banner {
  display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
  background: var(--blu-scuro); color: #fff; padding: 10px 16px;
}
.install-banner-text { flex: 1 1 auto; font-size: 14px; font-weight: 600; }
.install-banner-btn {
  flex: none; background: var(--verde); color: #fff; padding: 8px 16px; font-size: 14px;
}
.install-banner-btn:hover { filter: brightness(.93); }
.install-banner-close {
  flex: none; background: transparent; border: none; color: #cfe0f5; cursor: pointer;
  font-size: 16px; line-height: 1; padding: 6px 8px;
}
.install-banner-close:hover { color: #fff; }

.ios-hint {
  background: var(--blu-chiaro); border: 1px solid #b9d5f2; border-radius: var(--radius);
  padding: 12px 14px; margin: 0 0 16px; font-size: 14px; color: var(--blu-scuro);
}
.brand-title { margin: 0; font-size: 24px; color: var(--blu-scuro); line-height: 1.1; }
.brand-sub { margin: 2px 0 0; font-size: 14px; color: var(--testo-soft); }

.header-nav { background: var(--blu); }
.header-nav ul { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; }
.header-nav a {
  display: block; color: #fff; text-decoration: none; padding: 12px 18px;
  font-size: 15px; font-weight: 600;
}
.header-nav a:hover { background: rgba(255,255,255,.14); }

/* ---------- LAYOUT ---------- */
main { padding: 22px 0 40px; }
.layout { width: 100%; }
.content { min-width: 0; }

.card {
  background: #fff; border: 1px solid var(--grigio-bordo); border-radius: var(--radius);
  padding: 24px; margin-bottom: 22px; box-shadow: var(--ombra);
}
.card-title {
  margin: 0 0 14px; font-size: 20px; color: var(--blu-scuro);
  border-bottom: 3px solid var(--blu); padding-bottom: 8px; display: inline-block;
}
.card-intro { color: var(--testo-soft); margin-top: 0; }

/* ---------- FORM ---------- */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.field { margin-bottom: 16px; }
.field label, .label-like { display: block; font-weight: 600; margin-bottom: 6px; font-size: 15px; }
.opt { font-weight: 400; color: var(--testo-soft); }

input[type=text], input[type=date], select {
  width: 100%; padding: 11px 12px; font-size: 16px; color: var(--testo);
  border: 1px solid var(--grigio-bordo); border-radius: var(--radius); background: #fff;
}
input:focus, select:focus { outline: 3px solid rgba(0,102,204,.25); border-color: var(--blu); }

.date-row { display: flex; gap: 8px; }
.date-row #giorno { flex: 0 0 26%; }
.date-row #mese { flex: 1 1 auto; }
.date-row #anno { flex: 0 0 30%; }

.radio-row { display: flex; gap: 20px; padding-top: 6px; }
.radio { font-weight: 400; display: flex; align-items: center; gap: 6px; cursor: pointer; }

.hint { font-size: 13px; color: var(--testo-soft); margin: 6px 0 0; }

.actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 8px; }
.btn {
  display: inline-block; border: none; border-radius: var(--radius); padding: 12px 22px;
  font-size: 16px; font-weight: 600; cursor: pointer; font-family: inherit;
  text-decoration: none; text-align: center;
}
.btn-primary { background: var(--blu); color: #fff; }
.btn-primary:hover { background: var(--blu-scuro); }
.btn-secondary { background: var(--verde); color: #fff; }
.btn-secondary:hover { filter: brightness(.93); }
.btn-ghost { background: #fff; color: var(--blu); border: 1px solid var(--blu); }
.btn-ghost:hover { background: var(--blu-chiaro); }

/* ---------- RISULTATO / ALERT ---------- */
.alert { padding: 12px 14px; border-radius: var(--radius); margin-top: 16px; font-weight: 600; }
.alert-error { background: #fdecec; color: #a3241a; border: 1px solid #f3b6b1; }

.result {
  margin-top: 20px; padding: 22px; text-align: center;
  background: var(--blu-chiaro); border: 1px solid #b9d5f2; border-radius: var(--radius);
}
.result-label { margin: 0 0 8px; font-weight: 600; color: var(--blu-scuro); text-transform: uppercase; font-size: 13px; letter-spacing: 1px; }
.result-code {
  margin: 0 0 14px; font-size: clamp(16px, 5.2vw, 34px); font-weight: 700; letter-spacing: 2px;
  color: var(--blu-scuro); font-family: "Courier New", monospace;
  white-space: nowrap; overflow-x: auto; max-width: 100%;
}
.result-note { font-size: 12px; color: var(--testo-soft); margin: 14px 0 0; }

/* ---------- CONTENUTI ---------- */
.steps { padding-left: 20px; }
.steps li { margin-bottom: 6px; }
.card h3 { color: var(--blu-scuro); margin-bottom: 6px; }

details { border-bottom: 1px solid var(--grigio-bordo); padding: 10px 0; }
details summary { cursor: pointer; font-weight: 600; color: var(--blu-scuro); }
details p { margin: 8px 0 0; color: var(--testo-soft); }
.small { font-size: 13px; color: var(--testo-soft); }

/* ---------- PUBBLICITÀ (solo banner sopra e sotto) ---------- */
.ad-slot { display: flex; justify-content: center; margin: 0 0 22px; }
.ad-placeholder {
  width: 100%; display: flex; align-items: center; justify-content: center; text-align: center;
  background: repeating-linear-gradient(45deg, #eef1f4, #eef1f4 10px, #e6eaee 10px, #e6eaee 20px);
  color: #9aa5b1; font-size: 13px; border: 1px dashed var(--grigio-bordo); border-radius: var(--radius);
}
.ad-leaderboard .ad-placeholder { max-width: 728px; height: 90px; }

/* ---------- FOOTER ---------- */
.site-footer { background: var(--blu-scuro); color: #dfe7f0; padding: 22px 0; text-align: center; }
.site-footer p { margin: 4px 0; }
.site-footer .small { color: #a9bcd4; }
.footer-links a { color: #cfe0f5; text-decoration: none; font-weight: 600; }
.footer-links a:hover { text-decoration: underline; }

/* ---------- RESPONSIVE ---------- */
@media (max-width: 560px) {
  .grid-2 { grid-template-columns: 1fr; }
  .brand-title { font-size: 20px; }
  .header-nav a { padding: 10px 12px; font-size: 14px; }
}