/* ==========================================================================
   ITALOSVIZZERO – foglio di stile
   Indice:
   1. Variabili (colori, caratteri, misure)
   2. Base
   3. Intestazione e logo
   4. Presentazione
   5. Iscrizione
   6. Piè di pagina
   7. Pagine interne (privacy, conferma, 404)
   8. Utilità e accessibilità
   ========================================================================== */

/* 1. Variabili ------------------------------------------------------------ */
:root {
  --paper: #ffffff;         /* sfondo pagina */
  --paper-deep: #f4f3f1;   /* sfondo riquadro iscrizione */
  --ink: #1b1b1b;          /* testo principale */
  --ink-soft: #4a4744;     /* testo secondario */
  --rule: #cfc8bb;         /* filetti e bordi */
  --red: #c60000;          /* rosso distintivo, uguale a quello del logo */
  --red-dark: #9a0000;     /* rosso al passaggio del mouse */
  --error: #a3121b;
  --success: #1f5f3a;

  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Charter, "Bitstream Charter", Georgia, serif;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;

  --wrap: 72rem;           /* larghezza massima della pagina */
  --measure: 36rem;        /* larghezza massima delle righe di testo */
  --gutter: clamp(1rem, 4vw, 2.5rem);

  color-scheme: light;
}

/* 2. Base ----------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-size: clamp(1.0625rem, 0.98rem + 0.35vw, 1.25rem);
  line-height: 1.6;
  text-rendering: optimizeLegibility;
  font-kerning: normal;
  border-top: 4px solid var(--red);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main { flex: 1 0 auto; }

h1, h2, h3 {
  font-weight: 400;
  line-height: 1.12;
  letter-spacing: -0.01em;
  margin: 0;
}

p { margin: 0 0 1em; }

a {
  color: var(--red);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}
a:hover { color: var(--red-dark); text-decoration-thickness: 2px; }

:focus-visible {
  outline: 3px solid var(--red);
  outline-offset: 3px;
}

.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* 3. Intestazione e logo -------------------------------------------------- */
.masthead {
  padding-block: clamp(1.5rem, 4vw, 2.5rem) 0;
}
.masthead .wrap {
  display: flex;
  justify-content: center;
  padding-bottom: calc(clamp(1.25rem, 3vw, 1.75rem) + 5px);
  position: relative;
}
/* doppio filetto, come nelle testate a stampa: due linee della stessa lunghezza, allineate al testo */
.masthead .wrap::after {
  content: "";
  position: absolute;
  left: var(--gutter);
  right: var(--gutter);
  bottom: 0;
  height: 4px;
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
}

.brand {
  margin: 0;
  line-height: 1;
}
.brand a { color: inherit; text-decoration: none; }

/* Nome in forma tipografica: è la soluzione provvisoria finché non c'è il logo */
.brand__wordmark {
  font-family: var(--serif);
  font-size: clamp(1.5rem, 1rem + 2.6vw, 2.6rem);
  letter-spacing: 0.2em;
  margin-right: -0.2em; /* compensa la spaziatura dell'ultima lettera */
  font-weight: 400;
}

/* Logo ufficiale (inserito da js/main.js). Resta invisibile finché il file non è caricato. */
.brand__logo {
  display: none;
  height: clamp(2.25rem, 1.6rem + 2.4vw, 3.25rem); /* regolare qui l'altezza del logo */
  width: auto;
  max-width: min(80vw, 28rem);
  object-fit: contain;
}
.brand.has-logo .brand__logo { display: block; }
.brand.has-logo .brand__wordmark {
  position: absolute; width: 1px; height: 1px; overflow: hidden;
  clip: rect(0 0 0 0); white-space: nowrap;
}

.brand--small .brand__wordmark { font-size: 1.25rem; }
.brand--small .brand__logo { height: 2rem; }

/* 4. Presentazione -------------------------------------------------------- */
.intro {
  padding-block: clamp(3rem, 9vw, 7rem) clamp(3rem, 8vw, 6rem);
  display: grid;
  gap: clamp(2rem, 5vw, 3.5rem);
}

.intro__title {
  font-size: clamp(2.3rem, 1.2rem + 5.2vw, 5.25rem);
  line-height: 1.04;
  letter-spacing: -0.02em;
  max-width: 20ch;
  text-wrap: balance;
}

.intro__body {
  max-width: var(--measure);
  hyphens: manual;
}

.intro__lead::first-letter {
  float: left;
  font-size: 3.6em;
  line-height: 0.82;
  padding: 0.08em 0.1em 0 0;
  color: var(--red);
}

.intro__closing {
  margin-top: 1.75em;
  padding-top: 1.25em;
  border-top: 1px solid var(--rule);
  font-style: italic;
  color: var(--ink-soft);
}

@media (min-width: 56rem) {
  .intro {
    grid-template-columns: repeat(12, 1fr);
    column-gap: 2rem;
  }
  .intro__title { grid-column: 1 / span 10; }
  .intro__body {
    grid-column: 5 / span 7;
    position: relative;
  }
  /* breve filetto rosso a margine del testo */
  .intro__body::before {
    content: "";
    position: absolute;
    left: calc(-1 * (100% / 7 * 1) - 0.5rem);
    top: 0.55em;
    width: 3rem;
    border-top: 2px solid var(--red);
  }
}

/* 5. Iscrizione ----------------------------------------------------------- */
.signup {
  padding-bottom: clamp(3.5rem, 9vw, 7rem);
}
.signup:focus { outline: none; }

.signup__panel {
  background: var(--paper-deep);
  border-top: 3px solid var(--red);
  padding: clamp(1.75rem, 5vw, 3.5rem) clamp(1.25rem, 5vw, 3.5rem);
  display: grid;
  gap: 1.75rem;
}

@media (min-width: 56rem) {
  .signup__panel {
    grid-template-columns: 5fr 7fr;
    column-gap: clamp(2rem, 5vw, 4.5rem);
    align-items: start;
  }
}

.signup__title {
  font-size: clamp(1.75rem, 1.2rem + 2vw, 2.6rem);
  margin-bottom: 0.6em;
}
.signup__text p { color: var(--ink-soft); margin: 0; max-width: 28rem; }

.signup__form, .signup__done {
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.5;
}

.field__label {
  display: block;
  font-weight: 600;
  font-size: 0.9375rem;
  margin-bottom: 0.5rem;
}

.field__row {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}
@media (min-width: 36rem) {
  .field__row { flex-direction: row; gap: 0; }
  .field__input { border-right-width: 0; }
}

.field__input {
  flex: 1 1 auto;
  min-width: 0;
  font: inherit;
  font-size: 1.0625rem;
  color: var(--ink);
  background: #fff;
  border: 1px solid #7d776e;
  border-radius: 0;
  padding: 0.85rem 1rem;
  min-height: 3.25rem;
  -webkit-appearance: none;
  appearance: none;
}
.field__input:focus-visible { outline-offset: 0; }
.field__input[aria-invalid="true"] { border-color: var(--error); box-shadow: inset 0 0 0 1px var(--error); }

.button {
  font: inherit;
  font-weight: 600;
  font-size: 1rem;
  letter-spacing: 0.01em;
  color: #fff;
  background: var(--red);
  border: 1px solid var(--red);
  border-radius: 0;
  padding: 0.85rem 1.5rem;
  min-height: 3.25rem;
  cursor: pointer;
  white-space: nowrap;
}
.button:hover { background: var(--red-dark); border-color: var(--red-dark); }
.button:focus-visible { outline-offset: 3px; }
.button[disabled] { cursor: progress; opacity: 0.75; }

.consent {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  margin-top: 1.25rem;
  font-size: 0.9375rem;
  color: var(--ink-soft);
}
.consent__box {
  flex: none;
  width: 1.5rem;
  height: 1.5rem;
  margin: 0.05rem 0 0;
  accent-color: var(--red);
  cursor: pointer;
}
.consent__label { cursor: pointer; }

.signup__note { margin: 0.75rem 0 0; font-size: 0.9375rem; color: var(--ink-soft); }

.field__error {
  color: var(--error);
  font-size: 0.9375rem;
  font-weight: 600;
  margin: 0.5rem 0 0;
}

.form-status { margin: 1rem 0 0; font-size: 0.9375rem; }
.form-status:empty { display: none; }
.form-status.is-error {
  color: var(--error);
  border-left: 3px solid var(--error);
  padding-left: 0.75rem;
}

.signup__done {
  border-left: 3px solid var(--success);
  padding-left: 1rem;
}
.signup__done:focus { outline: none; }
.signup__done strong { display: block; font-size: 1.0625rem; margin-bottom: 0.25rem; }
.signup__done p { margin: 0; color: var(--ink-soft); }

/* Campo trappola antispam: nascosto a persone e lettori di schermo */
.hp {
  position: absolute !important;
  left: -10000px !important;
  width: 1px; height: 1px; overflow: hidden;
}

/* 6. Piè di pagina -------------------------------------------------------- */
.site-footer {
  font-family: var(--sans);
  font-size: 0.875rem;
  color: var(--ink-soft);
}
.site-footer__inner {
  border-top: 1px solid var(--ink);
  padding-block: 1.5rem 2.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 2rem;
  justify-content: space-between;
  align-items: baseline;
}
.site-footer p { margin: 0; }
.site-footer__name {
  font-family: var(--serif);
  letter-spacing: 0.2em;
  color: var(--ink);
}
.site-footer__links a { color: var(--ink-soft); }
.site-footer__links a:hover { color: var(--red); }
.site-footer__legal { flex-basis: 100%; order: 3; }

/* 7. Pagine interne ------------------------------------------------------- */
.page {
  padding-block: clamp(2.5rem, 7vw, 5rem) clamp(3rem, 8vw, 6rem);
}
.page__inner { max-width: 42rem; }
.page__title {
  font-size: clamp(2rem, 1.3rem + 3vw, 3.25rem);
  margin-bottom: 0.75em;
  text-wrap: balance;
}
.page h2 {
  font-size: clamp(1.3rem, 1.1rem + 0.8vw, 1.6rem);
  margin: 2.2em 0 0.6em;
}
.page ul { padding-left: 1.25em; margin: 0 0 1em; }
.page li { margin-bottom: 0.4em; }
.page__meta {
  font-family: var(--sans);
  font-size: 0.9375rem;
  color: var(--ink-soft);
}
.page__back { margin-top: 2.5rem; font-family: var(--sans); font-size: 1rem; }

/* Segnaposto dell'informativa: devono essere sostituiti prima della pubblicazione */
.todo {
  background: #fff2b3;
  color: #3d3200;
  font-family: var(--sans);
  font-size: 0.9em;
  padding: 0.05em 0.3em;
}

/* 8. Utilità e accessibilità --------------------------------------------- */
.skip-link {
  position: absolute;
  left: 1rem;
  top: -100px;
  background: var(--ink);
  color: #fff;
  padding: 0.6rem 1rem;
  font-family: var(--sans);
  font-size: 0.9375rem;
  z-index: 10;
}
.skip-link:focus { top: 1rem; color: #fff; }

@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}

@media print {
  body { border-top: 0; background: #fff; }
  .signup, .skip-link { display: none; }
}