/* ================================================================
   NAV.CSS — Navigazione principale + mobile menu
   ================================================================ */

.site-nav {
  position: fixed;
  top: 0; left: 0;
  width: 100%;
  z-index: 500;
  padding: 1.4rem var(--pad-x);
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: background var(--t-slow), backdrop-filter var(--t-slow), border-color var(--t-slow);
  border-bottom: 1px solid transparent;
}

.site-nav.scrolled {
  background: rgba(10, 9, 8, 0.85);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom-color: var(--border);
}

/* Progress bar */
.nav-progress {
  position: absolute;
  bottom: -1px; left: 0;
  height: 1px;
  width: 0%;
  background: linear-gradient(90deg, var(--accent), transparent);
  transition: width 0.1s linear;
}

/* Logo */
.nav-logo {
  font-family: var(--ff-display);
  font-size: 1.1rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  color: var(--text-primary);
  text-decoration: none;
  z-index: 600;
  position: relative;
}

.nav-logo-dot {
  color: var(--accent);
}

/* Links desktop */
.nav-links {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  list-style: none;
}

.nav-links a {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--ff-mono);
  font-size: 0.7rem;
  font-weight: 400;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--text-secondary);
  padding: 0.5rem 0.8rem;
  border-radius: var(--r-sm);
  text-decoration: none;
  transition: color var(--t-fast), background var(--t-fast);
  position: relative;
}

.nav-links a[data-num]::before {
  content: attr(data-num);
  font-size: 0.58rem;
  opacity: 0.4;
  font-weight: 300;
}

.nav-links a:hover {
  color: var(--text-primary);
  background: var(--border);
}

.nav-links a.active {
  color: var(--accent);
}

/* CTA button */
.nav-links .nav-cta {
  margin-left: 0.5rem;
  padding: 0.5rem 1.1rem;
  background: var(--surface-2);
  border: 1px solid var(--border-light);
  border-radius: var(--r-full);
  color: var(--text-primary);
  font-weight: 500;
  letter-spacing: 0.5px;
  transition: border-color var(--t-fast), background var(--t-fast), color var(--t-fast), transform var(--t-base) var(--ease-out);
}

.nav-links .nav-cta:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--bg);
  transform: translateY(-2px);
}

/* ---- Hamburger ---- */
.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 6px;
  padding: 8px;
  z-index: 600;
  position: relative;
  cursor: pointer;
}

.ham-line {
  display: block;
  width: 24px;
  height: 1.5px;
  background: var(--text-primary);
  transition: transform var(--t-base) var(--ease-out), opacity var(--t-fast);
  transform-origin: center;
}

.nav-hamburger.open .ham-line:nth-child(1) {
  transform: translateY(3.75px) rotate(45deg);
}

.nav-hamburger.open .ham-line:nth-child(2) {
  transform: translateY(-3.75px) rotate(-45deg);
}

/* ---- Mobile Menu Overlay ---- */
.mobile-menu {
  position: fixed;
  inset: 0;
  z-index: 490;
  background: var(--bg);
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: var(--pad-x);
  transform: translateX(100%);
  transition: transform 0.55s var(--ease-out);
  border-left: 1px solid var(--border);
}

.mobile-menu.open {
  transform: translateX(0);
}

.mobile-menu-nav {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.mobile-link {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  font-family: var(--ff-display);
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 800;
  letter-spacing: -1px;
  color: var(--text-secondary);
  text-decoration: none;
  padding: 0.6rem 0;
  border-bottom: 1px solid var(--border);
  transition: color var(--t-fast), transform var(--t-base) var(--ease-out);
  transform: translateX(30px);
  opacity: 0;
  transition: color var(--t-fast), transform 0.55s var(--ease-out), opacity 0.55s var(--ease-out);
}

.mobile-menu.open .mobile-link {
  transform: translateX(0);
  opacity: 1;
}

.mobile-menu.open .mobile-link:nth-child(1) { transition-delay: 0.08s; }
.mobile-menu.open .mobile-link:nth-child(2) { transition-delay: 0.13s; }
.mobile-menu.open .mobile-link:nth-child(3) { transition-delay: 0.18s; }
.mobile-menu.open .mobile-link:nth-child(4) { transition-delay: 0.23s; }
.mobile-menu.open .mobile-link:nth-child(5) { transition-delay: 0.28s; }
.mobile-menu.open .mobile-link:nth-child(6) { transition-delay: 0.33s; }

.mobile-link span {
  font-family: var(--ff-mono);
  font-size: 0.65rem;
  font-weight: 400;
  color: var(--accent);
  letter-spacing: 1px;
}

.mobile-link:hover {
  color: var(--text-primary);
  transform: translateX(8px);
}

.mobile-link--cta {
  color: var(--accent);
  border-bottom: none;
  font-size: clamp(1.5rem, 4vw, 2.2rem);
  margin-top: 1rem;
}

.mobile-menu-footer {
  position: absolute;
  bottom: 2rem;
  left: var(--pad-x);
  font-family: var(--ff-mono);
  font-size: 0.65rem;
  letter-spacing: 1px;
  color: var(--text-tertiary);
}

/* ---- Responsive ---- */
@media (max-width: 900px) {
  .nav-links {
    display: none;
  }

  .nav-hamburger {
    display: flex;
  }
}