:root {
  --bg: #05070b;
  --ink: rgba(255, 255, 255, 0.92);
  --muted: rgba(255, 255, 255, 0.62);
  --accent: #2fd4ff;
  --glass: rgba(10, 14, 22, 0.55);
  --glass2: rgba(10, 14, 22, 0.35);
  --stroke: rgba(255, 255, 255, 0.10);
  --shadow: 0 18px 60px rgba(0, 0, 0, 0.55);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica,
    Arial, "Apple Color Emoji", "Segoe UI Emoji";
  overflow-x: hidden;
}

/* Fullscreen canvas background */
#bg {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  display: block;
  z-index: 0;
}

/* Topbar */
.topbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 20;
  padding: 18px 28px;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 16px;
  pointer-events: none; /* riattiviamo solo sugli elementi cliccabili */
}

.brand {
  font-weight: 700;
  letter-spacing: 0.18em;
  opacity: 0.95;
  pointer-events: auto;
}

.nav {
  display: flex;
  gap: 22px;
  align-items: center;
  justify-content: center;
  pointer-events: auto;
}

.nav-btn {
  appearance: none;
  border: 0;
  background: transparent;
  color: rgba(255, 255, 255, 0.60);
  font-size: 12px;
  letter-spacing: 0.16em;
  padding: 8px 6px;
  cursor: pointer;
  position: relative;
}

.nav-btn::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -6px;
  height: 2px;
  background: var(--accent);
  opacity: 0;
  transform: scaleX(0.6);
  transition: opacity 180ms ease, transform 180ms ease;
}

.nav-btn.active {
  color: rgba(255, 255, 255, 0.92);
}

.nav-btn.active::after {
  opacity: 1;
  transform: scaleX(1);
}

.top-actions {
  display: flex;
  justify-content: flex-end;
  gap: 12px;
  pointer-events: auto;
}

.pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 14px;
  border-radius: 12px;
  color: rgba(255, 255, 255, 0.85);
  border: 1px solid rgba(255, 255, 255, 0.12);
  text-decoration: none;
  font-size: 12px;
  letter-spacing: 0.14em;
  background: rgba(10, 14, 22, 0.35);
  backdrop-filter: blur(10px);
}

.pill.primary {
  border-color: rgba(47, 212, 255, 0.35);
  color: var(--accent);
}

/* Layout sections */
main {
  position: relative;
  z-index: 10;
}

.section {
  min-height: 100vh;
  padding: 110px 24px 60px; /* spazio per topbar */
  display: grid;
  place-items: center;
}

.hero {
  place-items: center;
}

.hero-content {
  text-align: center;
  padding: 20px;
  max-width: 860px;
}

.hero-title {
  margin: 0;
  font-size: clamp(56px, 9vw, 120px);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.hero-sub {
  margin: 14px 0 0;
  font-size: 12px;
  letter-spacing: 0.26em;
  color: rgba(255, 255, 255, 0.65);
  line-height: 1.85;
  text-transform: uppercase;
}

.hero-hint {
  margin-top: 20px;
  font-size: 11px;
  letter-spacing: 0.28em;
  color: rgba(255, 255, 255, 0.35);
}

/* “Spaccature” / Cards */
.crack-card {
  width: min(920px, 92vw);
  padding: 28px 30px;
  border-radius: 18px;
  background: linear-gradient(180deg, var(--glass), var(--glass2));
  border: 1px solid var(--stroke);
  box-shadow: var(--shadow);
  backdrop-filter: blur(14px);
  position: relative;
  overflow: hidden;
}

/* effetto “crack” (non perfetto, ma già molto meglio del rettangolo piatto) */
.crack-card::before {
  content: "";
  position: absolute;
  inset: -2px;
  background:
    radial-gradient(600px 280px at 30% 20%, rgba(47, 212, 255, 0.12), transparent 55%),
    radial-gradient(520px 260px at 70% 80%, rgba(47, 212, 255, 0.08), transparent 55%),
    linear-gradient(135deg, rgba(255,255,255,0.10), transparent 30%, rgba(255,255,255,0.06), transparent 70%);
  pointer-events: none;
  opacity: 0.9;
}

.crack-card.small {
  width: min(520px, 92vw);
  padding: 22px 24px;
}

.crack-card.center {
  text-align: center;
}

h2,
h3 {
  margin: 0 0 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.muted {
  color: var(--muted);
  margin: 0 0 12px;
}

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

ul {
  margin: 12px 0 0;
  padding-left: 18px;
  color: rgba(255, 255, 255, 0.80);
}

.steps {
  list-style: none;
  padding: 0;
  margin: 14px 0 0;
  display: grid;
  gap: 10px;
}

.steps li {
  display: flex;
  gap: 12px;
  align-items: baseline;
  color: rgba(255, 255, 255, 0.84);
  letter-spacing: 0.10em;
}

.steps .n {
  color: var(--accent);
  font-weight: 700;
  letter-spacing: 0.12em;
}

.cta {
  display: inline-flex;
  margin-top: 14px;
  padding: 12px 18px;
  border-radius: 12px;
  border: 1px solid rgba(47, 212, 255, 0.40);
  text-decoration: none;
  color: var(--accent);
  background: rgba(10, 14, 22, 0.35);
  backdrop-filter: blur(10px);
  letter-spacing: 0.14em;
  font-size: 12px;
}

.mono {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono",
    "Courier New", monospace;
  letter-spacing: 0.06em;
  color: rgba(255, 255, 255, 0.88);
}

/* Grid section */
.grid {
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  align-content: center;
}

@media (max-width: 900px) {
  .topbar {
    grid-template-columns: 1fr auto;
    grid-template-areas:
      "brand actions"
      "nav nav";
    row-gap: 10px;
    padding: 14px 16px;
  }
  .brand {
    grid-area: brand;
  }
  .top-actions {
    grid-area: actions;
  }
  .nav {
    grid-area: nav;
    gap: 14px;
    flex-wrap: wrap;
  }
  .section {
    padding-top: 140px;
  }
  .grid {
    grid-template-columns: 1fr;
  }
}