/* 4Build — landing statica (F6). Palette di docs/brand: blu cantiere e arancio sicurezza. */
:root {
  --blue: #1e3a5f;
  --blue-dark: #0f1e33;
  --accent: #f59e0b;
  --ink: #1e293b;
  --muted: #475569;
  --line: #e2e8f0;
  --bg-soft: #f8fafc;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Noto Sans", sans-serif;
  color: var(--ink);
  line-height: 1.6;
  background: #fff;
}
img { max-width: 100%; height: auto; }
a { color: inherit; }
h1, h2, h3 { line-height: 1.2; margin: 0 0 0.5rem; }
p { margin: 0 0 0.75rem; }
.wrap { max-width: 1080px; margin: 0 auto; padding: 0 1.25rem; }
.skip { position: absolute; left: -999px; }
.skip:focus { left: 1rem; top: 1rem; background: #fff; padding: 0.5rem 1rem; z-index: 10; }

.top { background: var(--blue); }
.bar { display: flex; align-items: center; justify-content: space-between; gap: 1rem; flex-wrap: wrap; padding-top: 0.9rem; padding-bottom: 0.9rem; }
.top nav { display: flex; align-items: center; gap: 1.25rem; }
.top nav a { color: #fff; text-decoration: none; font-size: 0.95rem; }
.top nav a:hover { text-decoration: underline; }

.btn { display: inline-block; padding: 0.7rem 1.3rem; border-radius: 0.6rem; font-weight: 600; text-decoration: none; }
.btn-primary { background: var(--accent); color: #111827; }
.btn-primary:hover { background: #fbbf24; }
.btn-light { background: rgba(255, 255, 255, 0.12); color: #fff; border: 1px solid rgba(255, 255, 255, 0.35); }
.btn-ghost { border: 1px solid rgba(255, 255, 255, 0.5); padding: 0.4rem 0.9rem; }

.hero { background: linear-gradient(135deg, var(--blue-dark), var(--blue)); color: #fff; padding: 4.5rem 0 4rem; }
.hero h1 { font-size: clamp(2rem, 4.5vw, 3rem); max-width: 18ch; }
.lead { font-size: 1.15rem; max-width: 60ch; color: #e2e8f0; }
.eyebrow { text-transform: uppercase; letter-spacing: 0.08em; font-size: 0.8rem; font-weight: 700; color: var(--accent); }
.hero .eyebrow { color: #fbbf24; }
.cta { display: flex; gap: 0.75rem; flex-wrap: wrap; margin-top: 1.5rem; }

section { padding: 3.5rem 0; }
.title { font-size: 1.75rem; margin-bottom: 1.5rem; }
.grid2, .grid3, .grid4 { display: grid; gap: 1.5rem; }
@media (min-width: 720px) {
  .grid2 { grid-template-columns: 1fr 1fr; }
  .grid3 { grid-template-columns: repeat(3, 1fr); }
  .grid4 { grid-template-columns: repeat(4, 1fr); }
}
.sectors h2, .trust h2 { font-size: 1.1rem; }
.sectors p, .trust p { color: var(--muted); }
.features, .trust { background: var(--bg-soft); }
.card { background: #fff; border: 1px solid var(--line); border-radius: 0.9rem; padding: 1.5rem; }
.card h3 { font-size: 1.25rem; }
.card ul { margin: 0.5rem 0 0; padding-left: 1.1rem; color: var(--muted); }
.card li { margin-top: 0.35rem; }

.steps ol { list-style: none; padding: 0; margin: 0; counter-reset: s; }
.steps li { counter-increment: s; border-top: 3px solid var(--accent); padding-top: 0.75rem; display: flex; flex-direction: column; gap: 0.25rem; }
.steps li::before { content: counter(s); font-weight: 800; font-size: 1.5rem; color: var(--blue); }
.steps span { color: var(--muted); }

.band { background: var(--blue); color: #fff; text-align: center; }
.band p { color: #e2e8f0; }

.foot { border-top: 1px solid var(--line); font-size: 0.85rem; color: var(--muted); }
.foot nav { display: flex; gap: 1rem; }
.foot p { margin: 0; }