/* Nasconde visivamente un elemento senza toglierlo dal flusso letto da
   screen reader e crawler (diverso da display:none, che nasconde anche a
   loro): usata per l'h1 di ogni pagina, presente per SEO/accessibilità
   ma senza alterare l'aspetto del terminale. */
.sr-only{
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

:root{
  --bg: #f4f6f4;
  --bg-topbar: #e9eee9;
  --border: #dbe3dd;
  --text: #2a3b2f;
  --text-muted: #8a9a8e;
  --text-output: #516355;
  --accent: #20415a;
  --accent-light: #2f6690;
  --error: #b5544f;
}

html, body{
  margin: 0;
  height: 100%;
  overflow: hidden;
  background: var(--bg);
  color: var(--text);
  font-family: 'JetBrains Mono', monospace;
}

a{
  color: var(--accent);
}

a:hover{
  color: var(--accent-light);
}

.accent{
  color: var(--accent);
  font-weight: 600;
}

.muted{
  color: var(--text-muted);
}

#cursor{
  display: inline-block;
  width: 8px;
  height: 15px;
  background: var(--accent-light);
  vertical-align: text-bottom;
  margin-left: 2px;
  animation: blink 1s step-end infinite;
}

@keyframes blink{
  0%, 49% { opacity: 1; }
  50%, 100% { opacity: 0; }
}

.page{
  height: 100vh; /* fallback */
  height: var(--app-height, 100vh); /* impostata via JS (visualViewport): più affidabile di vh/dvh sui browser mobili */
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.topbar{
  flex-shrink: 0;
  display: flex;
  gap: 8px;
  padding: 14px 20px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-topbar);
}

.topbar-title{
  color: #6b7d70;
  font-size: 13px;
}

.nav-toggle{
  display: none; /* visibile solo sotto i 680px, vedi responsive.css */
}

.topbar-nav{
  margin-left: auto;
  display: flex;
  gap: 20px;
  font-size: 13px;
}

.topbar-nav a{
  text-decoration: none;
}

.topbar-nav a:hover{
  text-decoration: underline;
}

.nav-item{
  position: relative;
}

.submenu{
  visibility: hidden;
  opacity: 0;
  pointer-events: none;
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 190px;
  padding: 6px 0;
  background: var(--bg-topbar);
  border: 1px solid var(--border);
  border-radius: 6px;
  box-shadow: 0 6px 16px rgba(0, 0, 0, .08);
  z-index: 10;
  transition: opacity .12s ease;
}

.nav-item.has-submenu:hover > .submenu,
.nav-item.has-submenu:focus-within > .submenu,
.nav-item.has-submenu.open > .submenu{
  visibility: visible;
  opacity: 1;
  pointer-events: auto;
}

/* Forza la chiusura di un sottomenu aperto via :hover subito dopo un click
   (vedi nav.js, forceCloseAncestorSubmenus): senza, il sottomenu resterebbe
   visibile finché il mouse non si sposta, perché :hover continua a valere.
   Scoperto solo su input con hover/puntatore preciso: su mobile la
   visibilità del sottomenu è già gestita diversamente (accordion, vedi
   responsive.css) e questa regola non deve interferire. */
@media (hover: hover) and (pointer: fine){
  .nav-item.has-submenu.force-close > .submenu{
    visibility: hidden !important;
    opacity: 0 !important;
    pointer-events: none !important;
  }
}

.submenu .nav-item{
  position: relative;
}

.submenu > .nav-item > a{
  display: block;
  padding: 7px 16px;
  white-space: nowrap;
}

.submenu .nav-item.has-submenu > .submenu{
  top: -7px;
  left: 100%;
  margin-left: 6px;
}

.submenu--flip-right{
  left: auto;
  right: 0;
}

.submenu .nav-item.has-submenu > .submenu.submenu--flip-right{
  left: auto;
  right: 100%;
  margin-left: 0;
  margin-right: 6px;
}

.content-col{
  flex: 1;
  min-height: 0;
  max-width: 820px;
  width: 100%;
  margin: 0 auto;
  padding: 0 48px;
  box-sizing: border-box;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}