/* =========================================================
   style.css — Stile condiviso di tutto il sito
   Include: variabili colore, tema chiaro/scuro, layout
   responsive, card con hover, box risultato, breadcrumb,
   pulsante torna su e footer.
   ========================================================= */

/* ---------------------------------------------------------
   VARIABILI COLORE — TEMA CHIARO (default)
   --------------------------------------------------------- */
:root {
  --blu: #2563eb;
  --blu-scuro: #1d4ed8;
  --sfondo: #ffffff;
  --sfondo-alt: #f3f4f6;
  --card: #ffffff;
  --testo: #1f2937;
  --testo-soft: #4b5563;
  --bordo: #e5e7eb;
  --ombra: rgba(37, 99, 235, 0.15);
  --hero-testo: #ffffff;
  --transizione: 0.3s ease;
}

/* ---------------------------------------------------------
   VARIABILI COLORE — TEMA SCURO
   --------------------------------------------------------- */
:root[data-theme="dark"] {
  --blu: #3b82f6;
  --blu-scuro: #2563eb;
  --sfondo: #0f172a;
  --sfondo-alt: #111c33;
  --card: #1e293b;
  --testo: #e2e8f0;
  --testo-soft: #94a3b8;
  --bordo: #334155;
  --ombra: rgba(59, 130, 246, 0.25);
  --hero-testo: #ffffff;
}

/* ---------------------------------------------------------
   RESET DI BASE
   --------------------------------------------------------- */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: Arial, Helvetica, sans-serif;
  background-color: var(--sfondo);
  color: var(--testo);
  line-height: 1.6;
  transition: background-color var(--transizione), color var(--transizione);
}

a {
  color: var(--blu);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}

img,
svg {
  max-width: 100%;
}

/* Contenitore centrale */
.container {
  width: 100%;
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 16px;
}

/* ---------------------------------------------------------
   HEADER E NAVIGAZIONE
   --------------------------------------------------------- */
header {
  background-color: var(--card);
  border-bottom: 1px solid var(--bordo);
  position: sticky;
  top: 0;
  z-index: 100;
  transition: background-color var(--transizione), border-color var(--transizione);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  padding: 12px 16px;
  max-width: 1000px;
  margin: 0 auto;
}

.logo {
  font-size: 1.25rem;
  font-weight: bold;
  color: var(--blu);
  white-space: nowrap;
}
.logo:hover {
  text-decoration: none;
}

nav ul {
  list-style: none;
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
}

nav a {
  color: var(--testo);
  font-weight: bold;
  padding: 4px 2px;
  transition: color var(--transizione);
}
nav a:hover {
  color: var(--blu);
  text-decoration: none;
}

/* Gruppo a destra: tema + lingua */
.header-tools {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* Pulsante tema scuro (FUORI dal lang-switch come richiesto) */
#dark-toggle {
  background: none;
  border: 1px solid var(--bordo);
  border-radius: 8px;
  font-size: 1.1rem;
  width: 40px;
  height: 40px;
  cursor: pointer;
  transition: border-color var(--transizione), background-color var(--transizione);
}
#dark-toggle:hover {
  border-color: var(--blu);
}

/* Selettore lingua */
.lang-switch {
  display: flex;
  gap: 4px;
  border: 1px solid var(--bordo);
  border-radius: 8px;
  overflow: hidden;
}

.lang-btn {
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px 10px;
  font-size: 0.9rem;
  color: var(--testo-soft);
  transition: background-color var(--transizione), color var(--transizione);
}
.lang-btn.attivo {
  background-color: var(--blu);
  color: #ffffff;
}

/* ---------------------------------------------------------
   HERO (homepage)
   --------------------------------------------------------- */
.hero {
  position: relative;
  background-color: #2563eb; /* blu fisso come da specifica */
  color: var(--hero-testo);
  text-align: center;
  padding: 64px 16px 96px;
  overflow: hidden;
}

.hero h1 {
  font-size: 2.4rem;
  margin-bottom: 14px;
}

.hero p {
  font-size: 1.15rem;
  max-width: 640px;
  margin: 0 auto 28px;
  opacity: 0.95;
}

.hero-cta {
  display: inline-block;
  background-color: #ffffff;
  color: #2563eb;
  font-weight: bold;
  font-size: 1rem;
  padding: 14px 28px;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  transition: transform var(--transizione), box-shadow var(--transizione);
}
.hero-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
}

/* Forma ondulata SVG in fondo alla hero */
.hero-wave {
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 100%;
  line-height: 0;
}
.hero-wave svg {
  display: block;
  width: 100%;
  height: 80px;
}
.hero-wave path {
  fill: var(--sfondo);
  transition: fill var(--transizione);
}

/* ---------------------------------------------------------
   SEZIONI GENERICHE
   --------------------------------------------------------- */
main {
  padding: 40px 0 60px;
}

.sezione {
  margin-bottom: 48px;
}

h2 {
  font-size: 1.6rem;
  margin-bottom: 16px;
  color: var(--testo);
}

.intro {
  color: var(--testo-soft);
  max-width: 760px;
  margin-bottom: 24px;
}

/* ---------------------------------------------------------
   GRIGLIA CARD CALCOLATORI
   --------------------------------------------------------- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
}

.card {
  display: block;
  background-color: var(--card);
  border: 1px solid var(--bordo);
  border-radius: 14px;
  padding: 24px;
  color: var(--testo);
  transition: transform var(--transizione), box-shadow var(--transizione),
    border-color var(--transizione);
}
.card:hover {
  transform: translateY(-6px);
  box-shadow: 0 12px 24px var(--ombra);
  border-color: var(--blu);
  text-decoration: none;
}

.card-icon {
  width: 48px;
  height: 48px;
  margin-bottom: 14px;
  color: var(--blu);
}

.card h3 {
  font-size: 1.15rem;
  margin-bottom: 8px;
  color: var(--testo);
}

.card p {
  color: var(--testo-soft);
  font-size: 0.95rem;
}

/* ---------------------------------------------------------
   SEZIONE "PERCHÉ SCEGLIERCI" (mini-card)
   --------------------------------------------------------- */
.why-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 18px;
}

.mini-card {
  background-color: var(--sfondo-alt);
  border-radius: 12px;
  padding: 22px;
  text-align: center;
  transition: background-color var(--transizione);
}

.mini-card .card-icon {
  margin: 0 auto 12px;
}

.mini-card h3 {
  font-size: 1.05rem;
  margin-bottom: 6px;
}

.mini-card p {
  color: var(--testo-soft);
  font-size: 0.9rem;
}

/* ---------------------------------------------------------
   BREADCRUMB
   --------------------------------------------------------- */
.breadcrumb {
  font-size: 0.85rem;
  color: var(--testo-soft);
  padding: 16px 0 0;
}
.breadcrumb a {
  color: var(--testo-soft);
}
.breadcrumb a:hover {
  color: var(--blu);
}
.breadcrumb span {
  color: var(--testo);
}

/* ---------------------------------------------------------
   STRUMENTO CALCOLATORE (tab, input, bottoni)
   --------------------------------------------------------- */
.calc-box {
  background-color: var(--card);
  border: 1px solid var(--bordo);
  border-radius: 14px;
  padding: 24px;
  margin-bottom: 28px;
  transition: background-color var(--transizione), border-color var(--transizione);
}

/* Schede (tab) */
.tabs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 20px;
  border-bottom: 1px solid var(--bordo);
}

.tab-btn {
  background: none;
  border: none;
  border-bottom: 3px solid transparent;
  padding: 10px 14px;
  font-size: 0.95rem;
  font-weight: bold;
  color: var(--testo-soft);
  cursor: pointer;
  transition: color var(--transizione), border-color var(--transizione);
}
.tab-btn.attivo {
  color: var(--blu);
  border-bottom-color: var(--blu);
}

.tab-panel {
  display: none;
}
.tab-panel.attivo {
  display: block;
}

/* Campi del form */
.campo {
  margin-bottom: 16px;
}
.campo label {
  display: block;
  font-weight: bold;
  margin-bottom: 6px;
  font-size: 0.9rem;
}
.campo input,
.campo select {
  width: 100%;
  padding: 10px 12px;
  font-size: 1rem;
  font-family: inherit;
  border: 1px solid var(--bordo);
  border-radius: 8px;
  background-color: var(--sfondo);
  color: var(--testo);
  transition: border-color var(--transizione), background-color var(--transizione);
}
.campo input:focus,
.campo select:focus {
  outline: 2px solid var(--blu);
  outline-offset: 1px;
  border-color: var(--blu);
}

/* Riga con due campi affiancati */
.riga-campi {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

/* Gruppo di radio per aumento/diminuzione */
.radio-group {
  display: flex;
  gap: 18px;
  margin-top: 4px;
}
.radio-group label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-weight: normal;
}

/* Bottone Calcola */
.btn-calcola {
  background-color: var(--blu);
  color: #ffffff;
  border: none;
  border-radius: 8px;
  padding: 12px 24px;
  font-size: 1rem;
  font-weight: bold;
  cursor: pointer;
  transition: background-color var(--transizione), transform var(--transizione);
}
.btn-calcola:hover {
  background-color: var(--blu-scuro);
  transform: translateY(-1px);
}

/* ---------------------------------------------------------
   BOX RISULTATO (bordo blu a sinistra)
   --------------------------------------------------------- */
.risultato {
  margin-top: 20px;
  background-color: var(--sfondo-alt);
  border-left: 5px solid var(--blu);
  border-radius: 8px;
  padding: 18px 20px;
  transition: background-color var(--transizione);
}
.risultato.vuoto {
  color: var(--testo-soft);
}
.risultato .riga-ris {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 4px 0;
}
.risultato .valore-grande {
  font-size: 1.6rem;
  font-weight: bold;
  color: var(--blu);
}
.risultato .formula {
  margin-top: 10px;
  font-size: 0.85rem;
  color: var(--testo-soft);
  font-style: italic;
}
.risultato .errore {
  color: #dc2626;
  font-weight: bold;
}

/* ---------------------------------------------------------
   TABELLA AMMORTAMENTO
   --------------------------------------------------------- */
.tabella-wrap {
  overflow-x: auto;
  margin-top: 20px;
}
table.ammortamento {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}
table.ammortamento th,
table.ammortamento td {
  text-align: right;
  padding: 8px 12px;
  border-bottom: 1px solid var(--bordo);
}
table.ammortamento th {
  background-color: var(--sfondo-alt);
  color: var(--testo);
}
table.ammortamento th:first-child,
table.ammortamento td:first-child {
  text-align: left;
}

/* ---------------------------------------------------------
   FAQ
   --------------------------------------------------------- */
.faq h2 {
  margin-bottom: 16px;
}
.faq-item {
  border-bottom: 1px solid var(--bordo);
  padding: 14px 0;
}
.faq-item h3 {
  font-size: 1.05rem;
  margin-bottom: 6px;
  color: var(--testo);
}
.faq-item p {
  color: var(--testo-soft);
}

/* ---------------------------------------------------------
   TESTO SEO IN FONDO
   --------------------------------------------------------- */
.seo-text {
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid var(--bordo);
  color: var(--testo-soft);
  font-size: 0.92rem;
}

/* ---------------------------------------------------------
   PAGINA PRIVACY
   --------------------------------------------------------- */
.privacy-content {
  max-width: 760px;
}
.privacy-content p {
  margin-bottom: 16px;
  color: var(--testo-soft);
}

/* ---------------------------------------------------------
   FOOTER
   --------------------------------------------------------- */
footer {
  background-color: var(--card);
  border-top: 1px solid var(--bordo);
  padding: 28px 16px;
  text-align: center;
  color: var(--testo-soft);
  font-size: 0.9rem;
  transition: background-color var(--transizione), border-color var(--transizione);
}
footer a {
  color: var(--blu);
  margin: 0 6px;
}
footer .footer-line {
  margin-bottom: 6px;
}

/* ---------------------------------------------------------
   PULSANTE "TORNA SU"
   --------------------------------------------------------- */
#torna-su {
  position: fixed;
  right: 20px;
  bottom: 20px;
  width: 46px;
  height: 46px;
  border: none;
  border-radius: 50%;
  background-color: var(--blu);
  color: #ffffff;
  font-size: 1.3rem;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity var(--transizione), visibility var(--transizione),
    transform var(--transizione), background-color var(--transizione);
  box-shadow: 0 6px 16px var(--ombra);
}
#torna-su.visibile {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
#torna-su:hover {
  background-color: var(--blu-scuro);
}

/* ---------------------------------------------------------
   RESPONSIVE — schermi piccoli
   --------------------------------------------------------- */
@media (max-width: 640px) {
  .header-inner {
    justify-content: center;
  }
  nav ul {
    justify-content: center;
    gap: 12px;
  }
  .hero h1 {
    font-size: 1.8rem;
  }
  .hero p {
    font-size: 1rem;
  }
  .riga-campi {
    grid-template-columns: 1fr;
  }
}

/* Rispetta la preferenza "riduci movimento" */
@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
    scroll-behavior: auto !important;
  }
}