:root {
  --bg: #0d1117;
  --card-bg: #161b22;
  --border: #30363d;
  --text: #c9d1d9;
  --heading: #ffffff;
  --accent: #238636;
  --link: #58a6ff;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; background-color: var(--bg); color: var(--text); line-height: 1.6; overflow-x: hidden; }
a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; }
.container { max-width: 1000px; margin: 0 auto; padding: 0 1.25rem; }

/* Header & Menu Desktop */
header { border-bottom: 1px solid var(--border); padding: 1.25rem 0; }
.nav-wrapper { display: flex; justify-content: space-between; align-items: center; }
.logo { font-size: 1.35rem; font-weight: 700; color: var(--heading); letter-spacing: -0.5px; }
nav { width: auto; }
nav ul { display: flex; list-style: none; gap: 1.5rem; margin: 0; padding: 0; }
nav a { color: var(--text); font-weight: 500; font-size: 0.95rem; }
nav a:hover { color: var(--heading); }

.breadcrumbs { padding: 1.25rem 0 0.5rem; font-size: 0.85rem; color: #8b949e; }
.breadcrumbs a { color: #8b949e; }
.breadcrumbs span { margin: 0 0.5rem; }

.page-header, .hero { padding: 2rem 0 2.5rem; }
article h1, .page-header h1, .hero h1 { font-size: 2.3rem; color: var(--heading); margin: 1rem 0; line-height: 1.25; }
.lead, .hero p, .page-header p { font-size: 1.1rem; color: #8b949e; margin-bottom: 2rem; max-width: 850px; }
.lead { border-left: 3px solid var(--accent); padding-left: 1rem; }

.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 1.5rem; margin: 2rem 0; }
.card { background: var(--card-bg); border: 1px solid var(--border); border-radius: 6px; padding: 1.5rem; display: flex; flex-direction: column; justify-content: space-between; }
.card:hover { border-color: var(--link); }
.card-tag { font-size: 0.75rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.5px; color: var(--accent); margin-bottom: 0.5rem; }
.card h2 { font-size: 1.3rem; color: var(--heading); margin-bottom: 0.75rem; }
.card p { font-size: 0.95rem; color: #8b949e; margin-bottom: 1.25rem; flex-grow: 1; }
.card ul { list-style: none; font-size: 0.9rem; margin-bottom: 1.25rem; border-top: 1px solid var(--border); padding-top: 0.75rem; }
.card ul li { margin-bottom: 0.4rem; color: #8b949e; }
.card ul li strong { color: var(--text); }
.card-link { font-weight: 600; font-size: 0.95rem; }

.tech-box, .info-section { background: var(--card-bg); border: 1px solid var(--border); border-radius: 6px; padding: 1.5rem; margin: 2rem 0; }
.tech-box h4, .info-section h2 { color: var(--heading); margin-bottom: 0.75rem; font-size: 1.2rem; }

.table-responsive { width: 100%; overflow-x: auto; -webkit-overflow-scrolling: touch; margin: 1.5rem 0; border: 1px solid var(--border); border-radius: 6px; }
table { width: 100%; border-collapse: collapse; font-size: 0.9rem; min-width: 500px; }
th, td { text-align: left; padding: 0.75rem; border: 1px solid var(--border); }
th { background-color: #21262d; color: var(--heading); }

h2 { font-size: 1.5rem; color: var(--heading); margin: 2.5rem 0 1rem; border-bottom: 1px solid var(--border); padding-bottom: 0.5rem; }
h3 { font-size: 1.2rem; color: var(--heading); margin: 1.5rem 0 0.5rem; }
p { margin-bottom: 1.2rem; }
ul, ol { margin-bottom: 1.5rem; padding-left: 1.5rem; }
li { margin-bottom: 0.5rem; }

footer { border-top: 1px solid var(--border); padding: 2.5rem 0; margin-top: 4rem; font-size: 0.85rem; color: #8b949e; }
.footer-content { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 1.5rem; }

/* FIX MOBILE OTTIMIZZATO */
@media (max-width: 640px) {
  .nav-wrapper {
    flex-direction: column;
    align-items: stretch;
    gap: 1rem;
  }
  
  .logo {
    text-align: center;
  }

  nav {
    width: 100%;
  }

  /* Menu disposto a 2 colonne simmetriche su smartphone */
  nav ul {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.6rem;
    width: 100%;
  }

  nav ul li {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 4px;
    text-align: center;
  }

  nav ul li a {
    display: block;
    padding: 0.5rem 0.25rem;
    font-size: 0.85rem;
    color: var(--heading);
  }

  article h1, .page-header h1, .hero h1 {
    font-size: 1.65rem;
    line-height: 1.25;
  }

  .grid {
    grid-template-columns: 1fr;
  }

  .footer-content {
    flex-direction: column;
    text-align: center;
  }

  .footer-content ul {
    justify-content: center;
  }
}