/* =========================================================
   CIAS Rainbow — stylesheet moderno
   Palette derivata dal sito originale:
   azzurro #63b6db · grigi #707070/#EEEEEE · verde #8ad459
   ========================================================= */

:root {
  --color-primary: #63b6db;
  --color-primary-dark: #2f7fa6;
  --color-primary-darker: #1b3a5b;
  --color-accent: #8ad459;
  --color-ink: #1f2a37;
  --color-muted: #5b6b7b;
  --color-bg: #f4f6f8;
  --color-surface: #ffffff;
  --color-border: #e3e8ee;

  --radius: 14px;
  --radius-sm: 8px;
  --shadow-sm: 0 1px 3px rgba(27, 58, 91, .08), 0 1px 2px rgba(27, 58, 91, .06);
  --shadow-md: 0 8px 24px rgba(27, 58, 91, .10);
  --shadow-lg: 0 18px 48px rgba(27, 58, 91, .16);

  --header-h: 76px;
  --maxw: 1120px;

  --font: "Segoe UI", system-ui, -apple-system, Roboto, Helvetica, Arial, sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  color: var(--color-ink);
  background: var(--color-bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }

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

.container {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: 20px;
}

/* ---------- Header / nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, .9);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-h);
}
.nav__brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--color-primary-darker);
}
.nav__brand:hover { text-decoration: none; }
.nav__brand img { height: 44px; border-radius: 8px; }
.nav__brand span small {
  display: block;
  font-size: .7rem;
  font-weight: 600;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--color-primary);
}

.nav__links {
  display: flex;
  align-items: center;
  gap: 6px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.nav__links a {
  display: block;
  padding: 9px 14px;
  border-radius: var(--radius-sm);
  color: var(--color-muted);
  font-weight: 600;
  font-size: .95rem;
  transition: background .18s ease, color .18s ease;
}
.nav__links a:hover { background: #eaf5fb; color: var(--color-primary-dark); text-decoration: none; }
.nav__links a.is-active { background: var(--color-primary); color: #fff; box-shadow: var(--shadow-sm); }

.nav__toggle {
  display: none;
  border: 0;
  background: transparent;
  cursor: pointer;
  width: 44px; height: 44px;
  padding: 10px;
}
.nav__toggle span,
.nav__toggle span::before,
.nav__toggle span::after {
  content: "";
  display: block;
  height: 2px;
  background: var(--color-ink);
  border-radius: 2px;
  transition: transform .25s ease, opacity .25s ease;
}
.nav__toggle span { position: relative; }
.nav__toggle span::before { position: absolute; top: -7px; width: 100%; }
.nav__toggle span::after  { position: absolute; top: 7px;  width: 100%; }
.nav.is-open .nav__toggle span { background: transparent; }
.nav.is-open .nav__toggle span::before { transform: translateY(7px) rotate(45deg); }
.nav.is-open .nav__toggle span::after  { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero {
  background:
    radial-gradient(1200px 400px at 80% -10%, rgba(99,182,219,.35), transparent 60%),
    linear-gradient(135deg, var(--color-primary-darker), var(--color-primary-dark));
  color: #fff;
  padding: 72px 0 84px;
}
.hero__grid {
  display: grid;
  grid-template-columns: 1.1fr .9fr;
  gap: 48px;
  align-items: center;
}
.hero h1 {
  font-size: clamp(2rem, 4vw, 3rem);
  line-height: 1.12;
  margin: 0 0 18px;
  font-weight: 800;
}
.hero p { font-size: 1.12rem; color: rgba(255,255,255,.88); margin: 0 0 28px; max-width: 46ch; }
.hero__art {
  background: rgba(255,255,255,.08);
  border: 1px solid rgba(255,255,255,.18);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow-lg);
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: 999px;
  font-weight: 700;
  font-size: .98rem;
  cursor: pointer;
  border: 2px solid transparent;
  transition: transform .12s ease, box-shadow .2s ease, background .2s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn--primary { background: var(--color-accent); color: #143; box-shadow: var(--shadow-md); }
.btn--primary:hover { background: #79c948; }
.btn--ghost { background: rgba(255,255,255,.12); color: #fff; border-color: rgba(255,255,255,.45); }
.btn--ghost:hover { background: rgba(255,255,255,.2); }
.btn--outline { background: #fff; color: var(--color-primary-dark); border-color: var(--color-primary); }
.btn--outline:hover { background: var(--color-primary); color: #fff; }
.hero__actions { display: flex; flex-wrap: wrap; gap: 14px; }

/* ---------- Sections / page ---------- */
.section { padding: 64px 0; }
.section--tint { background: var(--color-surface); }
.section__head { text-align: center; max-width: 60ch; margin: 0 auto 44px; }
.section__head h2 {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  margin: 0 0 12px;
  color: var(--color-primary-darker);
}
.section__head p { color: var(--color-muted); margin: 0; font-size: 1.05rem; }

.eyebrow {
  display: inline-block;
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: 10px;
}

.page-header {
  background: linear-gradient(135deg, var(--color-primary-darker), var(--color-primary-dark));
  color: #fff;
  padding: 56px 0;
  text-align: center;
}
.page-header h1 { margin: 0; font-size: clamp(1.8rem, 4vw, 2.6rem); font-weight: 800; }
.page-header p { margin: 10px 0 0; color: rgba(255,255,255,.85); }

/* ---------- Cards ---------- */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  transition: transform .18s ease, box-shadow .18s ease;
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.card__icon {
  width: 52px; height: 52px;
  display: grid; place-items: center;
  border-radius: 14px;
  background: #eaf5fb;
  color: var(--color-primary-dark);
  margin-bottom: 16px;
}
.card__icon svg { width: 26px; height: 26px; }
.card h3 { margin: 0 0 8px; color: var(--color-primary-darker); font-size: 1.2rem; }
.card p { margin: 0; color: var(--color-muted); }

/* ---------- Prose (content pages) ---------- */
.prose {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  padding: clamp(24px, 5vw, 56px);
  max-width: 860px;
  margin-inline: auto;
}
.prose h2 {
  color: var(--color-primary-darker);
  margin: 32px 0 10px;
  font-size: 1.35rem;
  border-left: 4px solid var(--color-primary);
  padding-left: 12px;
}
.prose h2:first-child { margin-top: 0; }
.prose h3 { color: var(--color-primary-dark); margin: 22px 0 6px; font-size: 1.1rem; }
.prose p { color: #3b4858; margin: 0 0 14px; }
.prose ul { color: #3b4858; padding-left: 22px; }
.prose li { margin-bottom: 6px; }

/* ---------- Feature split ---------- */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}
.split img { border-radius: var(--radius); box-shadow: var(--shadow-md); margin-inline: auto; }

/* ---------- Download / store ---------- */
.download-card {
  display: flex;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  max-width: 760px;
  margin: 0 auto 22px;
}
.download-card img { width: 72px; height: 72px; border-radius: 16px; }
.download-card__body { flex: 1 1 260px; }
.download-card__body h3 { margin: 0 0 4px; color: var(--color-primary-darker); }
.download-card__body p { margin: 0; color: var(--color-muted); font-size: .95rem; }

.store-badges { display: flex; flex-wrap: wrap; gap: 16px; justify-content: center; align-items: center; }
.store-badges img { height: 52px; width: auto; }

.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
  max-width: 760px;
  margin: 0 auto;
}
.contact-item {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px;
  text-align: center;
  box-shadow: var(--shadow-sm);
}
.contact-item .label { font-size: .78rem; text-transform: uppercase; letter-spacing: .1em; color: var(--color-primary); font-weight: 700; }
.contact-item .value { font-size: 1.1rem; font-weight: 600; margin-top: 6px; word-break: break-word; }

/* ---------- Footer ---------- */
.site-footer {
  background: var(--color-primary-darker);
  color: rgba(255,255,255,.82);
  padding: 40px 0 28px;
  margin-top: 64px;
}
.site-footer__grid {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  justify-content: space-between;
  align-items: center;
}
.site-footer a { color: #fff; }
.site-footer__links { display: flex; flex-wrap: wrap; gap: 18px; list-style: none; margin: 0; padding: 0; }
.site-footer__bottom {
  margin-top: 24px;
  padding-top: 18px;
  border-top: 1px solid rgba(255,255,255,.15);
  text-align: center;
  font-size: .9rem;
}

/* ---------- Responsive ---------- */
@media (max-width: 860px) {
  .hero__grid, .split { grid-template-columns: 1fr; }
  .hero__art { order: -1; }

  .nav__toggle { display: block; }
  .nav__links {
    position: absolute;
    top: var(--header-h);
    left: 0; right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: #fff;
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
    padding: 8px;
    display: none;
  }
  .nav.is-open .nav__links { display: flex; }
  .nav__links a { padding: 14px 16px; border-radius: var(--radius-sm); }
}