/* =========================================================
   Nero su Bianco – foglio di stile unico per tutto il sito
   Idea grafica: inchiostro nero su carta, un solo accento rosso.
   In modalità scura diventa "bianco su nero".
   Per cambiare i colori basta modificare le variabili in :root.
   ========================================================= */

:root {
  --carta: #faf8f4;        /* sfondo pagina */
  --foglio: #ffffff;       /* riquadri e schede */
  --inchiostro: #141414;   /* testo principale */
  --grigio: #5c5a55;       /* testo secondario */
  --linea: #e3dfd6;        /* bordi e separatori */
  --rosso: #c81d2f;        /* accento calmo e istituzionale */
  --rosso-tenue: #f9e7ea;
  --blu: #1f4e8c;          /* accento secondario, più Ticino */
  --blu-tenue: #eaf1fb;
  --tenue: #f1eee7;        /* riquadri informativi */
  --ok: #17663f;
  --sfondo-top: #f9f7f2;
  --header-bg: rgba(250, 248, 244, 0.86);
  --scheda-bg-top: rgba(255, 255, 255, 0.9);
  --scheda-bg-bottom: rgba(255, 255, 255, 0.98);

  --serif: Charter, "Bitstream Charter", "Iowan Old Style", "Sitka Text", Cambria, Georgia, serif;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;

  --larghezza: 1080px;
  --lettura: 68ch;
  --raggio: 10px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --carta: #121212;
    --foglio: #1b1b1b;
    --inchiostro: #f2efe9;
    --grigio: #a8a39a;
    --linea: #2e2d2a;
    --rosso: #e9687a;
    --rosso-tenue: #3a1f26;
    --blu: #8ab2de;
    --blu-tenue: #1f2d40;
    --tenue: #222120;
    --ok: #5fcf98;
    --sfondo-top: #171717;
    --header-bg: rgba(18, 18, 18, 0.82);
    --scheda-bg-top: rgba(27, 27, 27, 0.9);
    --scheda-bg-bottom: rgba(27, 27, 27, 0.98);
    color-scheme: dark;
  }
}

/* ---------- Base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: 80px; }
body {
  margin: 0;
  background:
    radial-gradient(circle at top left, rgba(200, 29, 47, 0.05), transparent 24%),
    radial-gradient(circle at top right, rgba(31, 78, 140, 0.06), transparent 30%),
    linear-gradient(180deg, var(--sfondo-top) 0%, var(--carta) 22%, var(--carta) 100%);
  color: var(--inchiostro);
  font-family: var(--sans);
  font-size: 1.0625rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img, svg { max-width: 100%; height: auto; }
h1, h2, h3 {
  font-family: var(--serif);
  line-height: 1.15;
  margin: 0;
  text-wrap: balance;
}
h1 { font-size: clamp(2.1rem, 6vw, 3.6rem); letter-spacing: -0.02em; }
h2 { font-size: clamp(1.55rem, 3.5vw, 2.1rem); letter-spacing: -0.01em; }
h3 { font-size: 1.2rem; }
p { margin: 0; }
a { color: inherit; text-decoration-color: var(--blu); text-underline-offset: 3px; text-decoration-thickness: 1.5px; }
a:hover { color: var(--rosso); }
strong { font-weight: 700; }
:focus-visible { outline: 3px solid var(--blu); outline-offset: 2px; border-radius: 3px; }

.contenitore {
  max-width: var(--larghezza);
  margin: 0 auto;
  padding-left: max(16px, env(safe-area-inset-left));
  padding-right: max(16px, env(safe-area-inset-right));
}
.lettura { max-width: var(--lettura); }
.salta-al-contenuto {
  position: absolute; left: -9999px; top: 8px;
  background: var(--inchiostro); color: var(--carta); padding: 8px 12px; z-index: 100;
}
.salta-al-contenuto:focus { left: 8px; }

/* ---------- Intestazione ---------- */
.testata {
  position: sticky; top: 0; z-index: 20;
  background: var(--header-bg);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--linea);
}
.testata .contenitore {
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; min-height: 64px;
}
.logo {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--serif); font-size: 1.3rem; font-weight: 700;
  text-decoration: none; color: var(--inchiostro); white-space: nowrap;
}
.logo-marca {
  position: relative;
  display: inline-block;
  width: 28px;
  height: 38px;
  line-height: 1;
  font-family: var(--serif);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.08em;
}
.logo-marca .n,
.logo-marca .b {
  position: absolute;
  left: 3px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 18px;
  border-radius: 4px;
  overflow: hidden;
}
.logo-marca .n {
  top: 0;
  background: var(--inchiostro);
  color: var(--carta);
  z-index: 2;
}
.logo-marca .b {
  bottom: 0;
  background: var(--carta);
  color: var(--inchiostro);
  border: 1px solid var(--inchiostro);
  box-shadow: 0 0 0 1px rgba(255,255,255,0.15);
  z-index: 1;
}
.logo-testo {
  display: inline-flex; align-items: center; gap: 6px;
}
.logo .nero {
  background: var(--inchiostro); color: var(--carta);
  padding: 1px 8px 2px; border-radius: 4px;
}
.logo:hover { color: var(--inchiostro); }
.menu { display: flex; gap: 2px; }
.menu a {
  text-decoration: none; color: var(--grigio);
  font-size: 0.95rem; padding: 8px 12px; border-radius: 8px;
}
.menu a:hover, .menu a[aria-current="page"] { color: var(--inchiostro); background: var(--tenue); }
.menu-bottone {
  display: none;
  font: inherit; font-size: 0.95rem; font-weight: 600;
  background: none; color: var(--inchiostro);
  border: 1px solid var(--linea); border-radius: 8px; padding: 8px 12px; cursor: pointer;
}
@media (max-width: 760px) {
  .menu-bottone { display: block; }
  .menu {
    display: none; position: absolute; left: 0; right: 0; top: 100%;
    flex-direction: column; gap: 0;
    background: var(--carta); border-bottom: 1px solid var(--linea);
    padding: 8px 16px 16px;
  }
  .menu.aperto { display: flex; }
  .menu a { padding: 12px; font-size: 1.05rem; }
  .pubblicita-grid { grid-template-columns: 1fr; }
}

/* ---------- Sezioni ---------- */
main { display: block; }
.sezione { padding-block: 72px; border-top: 1px solid var(--linea); }
.sezione:first-child { border-top: 0; }
.pubblicita-sezione { padding-block: 28px 8px; }
.pubblicita-grid {
  display: grid; gap: 18px; margin-top: 8px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}
.pubblicita-slot {
  border: 1px solid var(--linea);
  border-radius: 16px;
  background: linear-gradient(180deg, rgba(20,20,20,0.02), rgba(20,20,20,0.01));
  padding: 22px 18px;
  min-height: 170px;
  display: flex; flex-direction: column; justify-content: center;
  box-shadow: 0 8px 18px rgba(20,20,20,0.02);
}
.pubblicita-tag {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--grigio);
  margin-bottom: 10px;
}
.pubblicita-slot h3 {
  font-size: 1.15rem;
  margin-bottom: 8px;
}
.pubblicita-slot p {
  color: var(--grigio);
  font-size: 0.96rem;
}
.occhiello {
  display: block; font-family: var(--mono); font-size: 0.75rem;
  letter-spacing: 0.1em; text-transform: uppercase; color: var(--rosso);
  margin-bottom: 10px;
}
.sotto { color: var(--grigio); margin-top: 12px; font-size: 1.05rem; }
.pila > * + * { margin-top: 16px; }

/* Apertura della home */
.apertura {
  padding-block: 72px 52px;
  position: relative;
}
.apertura::before {
  content: "";
  position: absolute;
  inset: 22px 0 auto 0;
  height: 1px;
  background: linear-gradient(90deg, var(--rosso) 0%, var(--blu) 100%);
}
.apertura h1 { max-width: 17ch; }
.apertura h1 em { font-style: normal; color: var(--rosso); }
.apertura p { font-size: 1.2rem; color: var(--grigio); max-width: 54ch; margin-top: 20px; }
.riga-nera { width: 84px; height: 8px; background: linear-gradient(90deg, var(--rosso) 0%, var(--blu) 100%); margin-bottom: 24px; border-radius: 999px; box-shadow: 0 8px 20px rgba(31,78,140,0.15); }

/* Griglie di schede */
.griglia {
  display: grid; gap: 16px; margin-top: 28px;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}
.scheda {
  display: flex; flex-direction: column; gap: 8px;
  background: linear-gradient(180deg, var(--scheda-bg-top), var(--scheda-bg-bottom));
  border: 1px solid var(--linea); border-radius: 16px;
  padding: 18px 18px 16px; text-decoration: none; color: var(--inchiostro);
  box-shadow: 0 10px 20px rgba(20,20,20,0.02);
  transition: transform 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease;
}
a.scheda:hover {
  border-color: rgba(20,20,20,0.25);
  color: var(--inchiostro);
  transform: translateY(-2px);
  box-shadow: 0 14px 22px rgba(20,20,20,0.05);
}
.scheda .etichetta {
  font-family: var(--sans); font-size: 0.72rem; font-weight: 700;
  color: var(--grigio); text-transform: none; letter-spacing: 0.04em;
  padding-bottom: 4px; border-bottom: 1px solid var(--linea);
}
.scheda h3 {
  font-family: var(--sans); font-size: 1.08rem; line-height: 1.25;
  letter-spacing: -0.02em; font-weight: 700;
}
.scheda p { color: var(--grigio); font-size: 0.95rem; }
.scheda ul { margin: 4px 0 0; padding: 0; list-style: none; }
.scheda li { border-top: 1px dashed var(--linea); }
.scheda li a { display: block; padding: 8px 0; text-decoration: none; font-size: 0.96rem; }
.scheda li a::after { content: " →"; color: var(--rosso); }
.scheda .vai { margin-top: auto; font-weight: 600; font-size: 0.95rem; }
.scheda .vai::after { content: " →"; color: var(--rosso); }

/* ---------- Guide (articoli) ---------- */
.guida-testa { padding-block: 48px 8px; }
.briciole { font-size: 0.85rem; color: var(--grigio); margin-bottom: 18px; }
.briciole a { color: var(--grigio); }
.aggiornato { font-family: var(--mono); font-size: 0.78rem; color: var(--grigio); margin-top: 14px; }
.guida { padding-block: 24px 56px; }
.guida h2 { margin-top: 44px; margin-bottom: 12px; font-size: clamp(1.4rem, 3vw, 1.75rem); }
.guida h3 { margin-top: 28px; margin-bottom: 8px; }
.guida p + p { margin-top: 14px; }
.guida ul, .guida ol { padding-left: 1.3em; margin: 12px 0; }
.guida li + li { margin-top: 6px; }
.in-breve {
  background: var(--foglio); border: 1px solid var(--linea); border-left: 6px solid var(--inchiostro);
  border-radius: 0 var(--raggio) var(--raggio) 0; padding: 18px 22px; margin-top: 24px;
}
.in-breve > strong:first-child { display: block; font-family: var(--serif); font-size: 1.1rem; margin-bottom: 6px; }
.in-breve ul { margin: 0; }
.cifre {
  display: grid; gap: 12px; margin-block: 24px;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}
.cifre div { background: var(--tenue); border-radius: var(--raggio); padding: 16px 18px; }
.cifre .n { font-family: var(--serif); font-weight: 700; font-size: 1.7rem; font-variant-numeric: tabular-nums; }
.cifre .l { color: var(--grigio); font-size: 0.9rem; }
.avviso {
  background: var(--rosso-tenue); border-left: 4px solid var(--rosso);
  border-radius: 0 8px 8px 0; padding: 14px 18px; font-size: 0.97rem; margin-top: 20px;
}
.fonti { margin-top: 40px; padding-top: 20px; border-top: 1px solid var(--linea); font-size: 0.92rem; color: var(--grigio); }
.fonti h2 { font-size: 1.1rem !important; margin: 0 0 8px !important; color: var(--inchiostro); }
.fonti ul { margin: 0; }
.tabella-scorri { overflow-x: auto; margin-block: 18px; }
table { border-collapse: collapse; width: 100%; font-size: 0.95rem; }
th, td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--linea); vertical-align: top; }
th { font-family: var(--sans); font-weight: 700; background: var(--tenue); }
td.num { font-variant-numeric: tabular-nums; white-space: nowrap; }

/* ---------- Strumenti (calcolatori e modelli) ---------- */
.strumento {
  display: grid; gap: 24px; margin-top: 24px;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
}
@media (max-width: 780px) { .strumento { grid-template-columns: 1fr; } }
.pannello {
  background: var(--foglio); border: 1px solid var(--linea); border-radius: 14px;
  padding: 22px; display: flex; flex-direction: column; gap: 16px; min-width: 0;
}
label { font-weight: 600; font-size: 0.95rem; display: flex; justify-content: space-between; gap: 12px; }
label output { font-family: var(--mono); color: var(--rosso); font-weight: 500; }
input[type=range] { width: 100%; accent-color: var(--inchiostro); }
input[type=text], input[type=email], input[type=date], select, textarea {
  width: 100%; font: inherit; font-size: 1rem; padding: 10px 12px;
  border: 1px solid var(--linea); border-radius: 8px; background: var(--carta); color: var(--inchiostro);
}
.campo { display: flex; flex-direction: column; gap: 6px; }
.suggerimento { font-size: 0.85rem; color: var(--grigio); }
.scelte { display: flex; gap: 6px; flex-wrap: wrap; }
.scelte button {
  flex: 1; min-width: 110px; font: inherit; font-size: 0.9rem; padding: 9px;
  border-radius: 8px; border: 1px solid var(--linea); background: var(--carta); color: var(--inchiostro); cursor: pointer;
}
.scelte button[aria-pressed="true"] { background: var(--inchiostro); border-color: var(--inchiostro); color: var(--carta); }
.risultato .grande {
  font-family: var(--serif); font-weight: 700; font-size: clamp(2rem, 6vw, 2.8rem);
  color: var(--ok); font-variant-numeric: tabular-nums; line-height: 1;
}
.righe div {
  display: flex; justify-content: space-between; gap: 12px; padding: 10px 0;
  border-bottom: 1px dashed var(--linea); font-variant-numeric: tabular-nums;
}
.righe div span:last-child { font-family: var(--mono); }
.barra { height: 14px; border-radius: 7px; background: var(--linea); overflow: hidden; display: flex; }
.barra i { display: block; height: 100%; }
.legenda { display: flex; gap: 16px; flex-wrap: wrap; font-size: 0.85rem; color: var(--grigio); }
.legenda span::before { content: ""; display: inline-block; width: 10px; height: 10px; border-radius: 2px; margin-right: 6px; background: var(--c); }
.lettera {
  white-space: pre-wrap; background: var(--carta); border: 1px solid var(--linea); border-radius: 8px;
  padding: 18px; font-size: 0.95rem; line-height: 1.55; min-height: 240px; overflow-wrap: anywhere;
}
.bottone {
  font: inherit; font-weight: 700; padding: 11px 18px; border: 0; border-radius: 8px;
  background: var(--inchiostro); color: var(--carta); cursor: pointer; align-self: flex-start; text-decoration: none;
}
.bottone:hover { color: var(--carta); opacity: 0.88; }
.scelte .bottone { background: var(--inchiostro); border-color: var(--inchiostro); color: var(--carta); }
.schede-modelli { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 24px; }

/* ---------- Calendario scadenze ---------- */
.calendario { margin-top: 24px; border-top: 2px solid var(--inchiostro); }
.calendario > div {
  display: grid; grid-template-columns: 150px minmax(0, 1fr); gap: 16px;
  padding: 16px 0; border-bottom: 1px solid var(--linea);
}
.calendario .data { font-family: var(--mono); font-weight: 600; color: var(--rosso); font-size: 0.92rem; }
.calendario h3 { font-family: var(--sans); font-size: 1.02rem; margin-bottom: 4px; }
.calendario p { color: var(--grigio); font-size: 0.95rem; }
.calendario .passata { opacity: 0.5; }
@media (max-width: 520px) { .calendario > div { grid-template-columns: 1fr; gap: 4px; } }

/* ---------- Spazi pubblicitari ----------
   Nascosti finché non attivi AdSense (fase 9 del piano).
   Per mostrarli: aggiungi la classe "annunci-attivi" al tag <body>. */
.spazio-annuncio { display: none; }
.annunci-attivi .spazio-annuncio {
  display: block; margin-block: 28px; min-height: 120px;
}

/* ---------- Piè di pagina ---------- */
.piede { border-top: 1px solid var(--linea); padding-block: 36px 48px; font-size: 0.9rem; color: var(--grigio); margin-top: 24px; }
.piede .contenitore { display: grid; gap: 24px; grid-template-columns: 2fr 1fr 1fr; }
@media (max-width: 700px) { .piede .contenitore { grid-template-columns: 1fr; } }
.piede h2 { font-family: var(--sans); font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--inchiostro); margin-bottom: 8px; }
.piede ul { list-style: none; padding: 0; margin: 0; }
.piede li { padding: 3px 0; }
.piede a { color: var(--grigio); }
.piede p + p { margin-top: 8px; }

@media (prefers-reduced-motion: no-preference) {
  a.scheda { transition: transform 0.15s, border-color 0.15s; }
  a.scheda:hover { transform: translateY(-2px); }
}
@media print {
  .testata, .piede, .spazio-annuncio, .menu-bottone, .salta-al-contenuto { display: none !important; }
  body { background: #fff; color: #000; }
  /* Nella pagina dei modelli si stampa solo la lettera */
  #modelli > .contenitore > *:not(.strumento),
  #modelli .strumento > .pannello:first-child,
  #modelli .pannello > *:not(.lettera) { display: none !important; }
  #modelli .strumento { display: block; }
  #modelli .pannello, #modelli .lettera { border: 0; padding: 0; background: #fff; }
  #modelli .lettera { font-size: 11pt; }
}