:root {
  --maxw: 1000px;
  --space-1: .5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --radius: 14px;
}
* { box-sizing: border-box; }
body { margin: 0; line-height: 1.5; -webkit-text-size-adjust: 100%; }
main, header nav, footer { width: min(100%, var(--maxw)); margin-inline: auto; padding-inline: var(--space-2); }
header nav { display: flex; align-items: center; justify-content: space-between; gap: var(--space-2); padding-block: var(--space-2); }
nav .brand { font-weight: 700; text-decoration: none; }
nav .links { display: flex; gap: .75rem; align-items: center; }
nav .toggle { display: inline-flex; border: 0; background: transparent; font-size: 1.4rem; padding: .25rem .5rem; }
@media (min-width: 768px) {
  nav .toggle { display: none; }
  nav .links { display: flex !important; }
}
@media (max-width: 767px) {
  nav .links { display: none; flex-direction: column; align-items: flex-start; padding-block: .5rem; }
  nav .links a { width: 100%; padding-block: .25rem; }
}
h1, h2, h3 { line-height: 1.2; margin-top: var(--space-3); }
h1 { font-size: clamp(1.6rem, 2.8vw + 1rem, 2.2rem); }
h2 { font-size: clamp(1.3rem, 2vw + .9rem, 1.8rem); }
h3 { font-size: clamp(1.1rem, 1.6vw + .8rem, 1.3rem); }
.container { width: min(100%, var(--maxw)); margin-inline: auto; }
.grid { display: grid; gap: var(--space-2); grid-template-columns: 1fr; }
@media (min-width: 640px) { .grid.sm-2 { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) { .grid.lg-3 { grid-template-columns: repeat(3, 1fr); } }
.card { border: 1px solid rgba(0,0,0,.08); border-radius: var(--radius); padding: var(--space-2); background: #fff; box-shadow: 0 1px 4px rgba(0,0,0,.04); }
ul.list { list-style: none; padding: 0; margin: 0; display: grid; gap: var(--space-2); }
ul.list > li { border: 1px solid rgba(0,0,0,.08); border-radius: var(--radius); padding: var(--space-2); background: #fff; }
form label { display: block; margin-bottom: var(--space-2); }
input, select, textarea, button { width: 100%; padding: .9rem 1rem; font-size: 1rem; border-radius: 12px; border: 1px solid #ccc; }
button { border: none; cursor: pointer; }
button, a.button { display: inline-block; width: auto; padding: .85rem 1.1rem; border-radius: 12px; }
.button { text-decoration: none; border: 1px solid rgba(0,0,0,.12); }
.actions a, .actions button { margin-right: .5rem; margin-top: .25rem; }
.section { margin-block: var(--space-3); }
.thread { overflow-x: auto; }

/* === NAV RESPONSIVE === */
nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}

nav .brand {
  font-weight: bold;
  font-size: 1.4em;
}

nav .links {
  display: flex;
  gap: 12px;
}

/* Bottone ☰ di default nascosto su desktop */
nav .toggle {
  display: none;
  background: none;
  border: 1px solid #ccc;
  border-radius: 6px;
  padding: 6px 10px;
  font-size: 1.2em;
  cursor: pointer;
}

/* Layout smartphone / tablet */
@media (max-width: 900px) {
  nav {
    flex-direction: column;
    align-items: flex-start;
  }

  nav .toggle {
    display: inline-block;
  }

  nav .links {
    flex-direction: column;
    width: 100%;
    display: none; /* sarà aperto col toggle */
    background: #fff;
    border-top: 1px solid #eee;
    padding: 10px 0;
  }

  nav .links a {
    padding: 8px 16px;
    width: 100%;
  }
}

/* Migliorie generali */
body {
  overflow-x: hidden;
}

main.container {
  padding: 16px;
}

/* === Pulsante menu mobile nero === */
nav .toggle {
  color: #000;                 /* icona nera */
  border: 1px solid #000;      /* bordo nero */
  background: #fff;            /* sfondo bianco */
  border-radius: 6px;
  padding: 6px 10px;
  font-size: 1.3em;
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
}

nav .toggle:hover {
  background: #000;
  color: #fff;                 /* inverte al passaggio */
}