/* ===================================================================
   Academy della Sicurezza — foglio di stile principale
   Iterazione 3: palette Sollertia + Academy, tipografia Inter,
   layout madre (header sticky, footer navy), componenti base.
   =================================================================== */

:root {
  --color-primary: #1A2744;
  --color-accent: #F97316;
  --color-secondary: #00B4D8;
  --color-text: #1A2744;
  --color-text-muted: #475569;
  --color-bg: #FFFFFF;
  --color-bg-alt: #F8FAFC;
  --color-border: #E2E8F0;

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  --radius: 8px;
  --radius-lg: 12px;
  --container-max: 1200px;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.04);
  --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.08), 0 1px 2px -1px rgb(0 0 0 / 0.04);
}

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

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

h1, h2, h3, h4 {
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-primary);
  margin: 0 0 0.6em;
}
h1 { font-size: clamp(2rem, 4vw, 3rem); letter-spacing: -0.02em; }
h2 { font-size: clamp(1.5rem, 2.8vw, 2.2rem); letter-spacing: -0.01em; }
h3 { font-size: 1.25rem; }

p { margin: 0 0 1rem; }

.container {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: 1.5rem;
}

/* --- Header sticky --------------------------------------------------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}
.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  padding-block: 0.9rem;
}
.site-header__logo img { display: block; height: 44px; width: auto; }
.site-header__logo { display: inline-flex; }

.site-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 1.8rem;
  align-items: center;
}
.site-nav a {
  color: var(--color-text);
  font-weight: 500;
  font-size: 0.95rem;
  padding: 0.25rem 0;
  border-bottom: 2px solid transparent;
  transition: border-color .15s ease, color .15s ease;
}
.site-nav a:hover,
.site-nav a.is-active {
  color: var(--color-primary);
  border-bottom-color: var(--color-accent);
}

.site-header__toggle {
  display: none;
  background: none;
  border: 0;
  font-size: 1.5rem;
  color: var(--color-primary);
  cursor: pointer;
}

/* --- Bottoni --------------------------------------------------------- */

.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 1rem;
  line-height: 1;
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform .12s ease, background .15s ease, color .15s ease;
}
.btn--accent { background: var(--color-accent); color: #fff; }
.btn--accent:hover { background: #ea6a0e; color: #fff; transform: translateY(-1px); }
.btn--outline-light { background: transparent; color: #fff; border-color: rgba(255,255,255,0.4); }
.btn--outline-light:hover { background: rgba(255,255,255,0.1); color: #fff; }
.btn--outline { background: transparent; color: var(--color-primary); border-color: var(--color-primary); }
.btn--outline:hover { background: var(--color-primary); color: #fff; }

/* --- Hero ------------------------------------------------------------ */

.hero {
  background: linear-gradient(135deg, #0F1A2F 0%, #1A2744 50%, #243656 100%);
  color: #fff;
  padding: 6rem 0 5rem;
  position: relative;
  overflow: hidden;
}
.hero::after {
  content: "";
  position: absolute;
  right: -120px; top: -120px;
  width: 320px; height: 320px;
  background: radial-gradient(circle, rgba(0,180,216,0.22) 0%, transparent 70%);
  pointer-events: none;
}
.hero h1 { color: #fff; margin-bottom: 0.5rem; }
.hero h1 strong { color: var(--color-accent); font-weight: 800; }
.hero__payoff {
  font-size: clamp(1.15rem, 2vw, 1.4rem);
  color: rgba(255,255,255,0.85);
  max-width: 680px;
  margin-bottom: 2rem;
}
.hero__actions { display: flex; flex-wrap: wrap; gap: 1rem; }

/* --- Sezioni --------------------------------------------------------- */

.section {
  padding: 4rem 0;
}
.section--alt { background: var(--color-bg-alt); }
.section__lead {
  font-size: 1.1rem;
  color: var(--color-text-muted);
  max-width: 780px;
  margin-bottom: 2.5rem;
}

/* --- Griglia card ---------------------------------------------------- */

.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  transition: transform .15s ease, box-shadow .15s ease, border-color .15s ease;
}
.card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow);
  border-color: var(--color-accent);
}
.card__tag {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 0.6rem;
}
.card h3 { margin-top: 0; margin-bottom: 0.5rem; }
.card p { color: var(--color-text-muted); font-size: 0.98rem; }
.card__link {
  display: inline-block;
  margin-top: 0.75rem;
  font-weight: 600;
  color: var(--color-primary);
}
.card__link::after { content: " →"; transition: margin-left .15s ease; }
.card__link:hover { color: var(--color-accent); }

/* --- Triangolo (home) ----------------------------------------------- */

.triangle {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.25rem;
  margin-top: 2rem;
}
.triangle__node {
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  background: var(--color-bg);
  position: relative;
}
.triangle__node h4 { color: var(--color-primary); margin-top: 0; font-size: 1.1rem; }
.triangle__node span {
  display: inline-block;
  background: var(--color-secondary);
  color: #fff;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  padding: 0.15rem 0.55rem;
  border-radius: 4px;
  text-transform: uppercase;
  margin-bottom: 0.8rem;
}
.triangle__node p { color: var(--color-text-muted); margin: 0; font-size: 0.95rem; }

/* --- CTA chiusura ---------------------------------------------------- */

.cta {
  background: linear-gradient(135deg, var(--color-primary) 0%, #243656 100%);
  color: #fff;
  padding: 3.5rem 2rem;
  border-radius: var(--radius-lg);
  text-align: center;
  margin: 3rem 0;
}
.cta h2 { color: #fff; }
.cta p { color: rgba(255,255,255,0.82); max-width: 640px; margin-inline: auto; margin-bottom: 1.8rem; }

/* --- Liste case/linee guida/progetti -------------------------------- */

.item-list { display: grid; gap: 1.25rem; margin-top: 1rem; }
.item-list article {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-accent);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
}
.item-list article h3 { margin-top: 0; margin-bottom: 0.3rem; font-size: 1.15rem; }
.item-list__meta {
  display: inline-block;
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--color-text-muted);
  margin-bottom: 0.4rem;
}
.item-list p { margin: 0; color: var(--color-text-muted); }

/* --- Team ------------------------------------------------------------ */

.team {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}
.team__person {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
}
.team__person h3 { margin-top: 0; margin-bottom: 0.2rem; }
.team__person .role { color: var(--color-accent); font-weight: 600; font-size: 0.92rem; margin-bottom: 0.75rem; }
.team__person .bio { color: var(--color-text-muted); font-size: 0.95rem; }
.placeholder {
  display: inline-block;
  background: #FFF7ED;
  color: #9A3412;
  font-size: 0.78rem;
  font-weight: 600;
  padding: 0.15rem 0.5rem;
  border-radius: 3px;
  margin-right: 0.4rem;
}

/* --- Form contatti --------------------------------------------------- */

.form {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  max-width: 680px;
}
.form__row { margin-bottom: 1.1rem; }
.form label {
  display: block;
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 0.35rem;
}
.form input, .form textarea {
  width: 100%;
  font-family: inherit;
  font-size: 1rem;
  padding: 0.7rem 0.9rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-bg);
  color: var(--color-text);
}
.form input:focus, .form textarea:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(249,115,22,0.12);
}
.form textarea { resize: vertical; min-height: 140px; }
.form__note {
  background: #FFF7ED;
  border-left: 3px solid var(--color-accent);
  color: #9A3412;
  padding: 0.7rem 1rem;
  border-radius: var(--radius);
  font-size: 0.9rem;
  margin-bottom: 1.5rem;
}

/* --- Footer ---------------------------------------------------------- */

.site-footer {
  background: var(--color-primary);
  color: rgba(255,255,255,0.75);
  padding: 3.5rem 0 1.5rem;
  margin-top: 5rem;
}
.site-footer__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 2.5rem;
}
.site-footer h4 {
  color: #fff;
  font-size: 0.92rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-top: 0;
  margin-bottom: 1rem;
}
.site-footer ul { list-style: none; margin: 0; padding: 0; }
.site-footer li { margin-bottom: 0.5rem; }
.site-footer a { color: rgba(255,255,255,0.78); font-size: 0.95rem; }
.site-footer a:hover { color: var(--color-accent); }

.site-footer__credits {
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(255,255,255,0.12);
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
  align-items: center;
  justify-content: space-between;
  font-size: 0.88rem;
}
.site-footer__sollertia img { height: 40px; width: auto; display: block; opacity: 0.92; }
.site-footer__sollertia { display: inline-flex; align-items: center; gap: 0.8rem; }

/* --- Responsive ------------------------------------------------------ */

@media (max-width: 820px) {
  .site-header__toggle { display: inline-flex; }
  .site-nav {
    position: absolute;
    top: 100%; left: 0; right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    display: none;
  }
  .site-nav.is-open { display: block; }
  .site-nav ul {
    flex-direction: column;
    gap: 0;
    align-items: stretch;
  }
  .site-nav li { border-top: 1px solid var(--color-border); }
  .site-nav a { display: block; padding: 0.9rem 1.5rem; }

  .hero { padding: 4rem 0 3.5rem; }
  .cta { padding: 2.5rem 1.5rem; }
}