/* ── Header ────────────────────────────────────────── */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: 72px;
  background: transparent;
  transition: background 0.3s ease, border-color 0.3s ease;
  border-bottom: 1px solid transparent;
}

.site-header.scrolled {
  background: var(--color-bg);
  border-bottom-color: var(--color-border);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--padding-x);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-8);
}

/* Logo */
.header-logo {
  display: flex;
  flex-direction: column;
  text-decoration: none;
  flex-shrink: 0;
  line-height: 1;
  gap: 3px;
}

.header-logo__name {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: var(--text-2xl);
  letter-spacing: 0.08em;
  color: var(--color-text);
  line-height: 1;
}

.header-logo__sub {
  font-family: var(--font-label);
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

/* Nav */
.header-nav {
  flex: 1;
  display: flex;
  justify-content: center;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-8);
  list-style: none;
}

.nav-link {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 400;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text);
  text-decoration: none;
  transition: color 0.3s ease;
}

.nav-link:hover {
  color: var(--color-accent);
}

/* Actions */
.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  flex-shrink: 0;
}

/* Bottone primary header — §05 design.md */
.btn-primary {
  display: inline-block;
  background: var(--color-accent);
  color: var(--color-bg);
  padding: 14px 36px;
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 400;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  border: none;
  border-radius: 0;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.3s ease;
}

.btn-primary:hover {
  background: var(--color-accent-warm);
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 32px;
  height: 32px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}

.hamburger span {
  display: block;
  width: 20px;
  height: 1px;
  background: var(--color-text);
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.hamburger.is-open span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}
.hamburger.is-open span:nth-child(2) {
  opacity: 0;
}
.hamburger.is-open span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

/* ── Mobile menu ───────────────────────────────────── */

.mobile-menu {
  position: fixed;
  inset: 0;
  z-index: 99;
  background: var(--color-dark);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.mobile-menu.is-open {
  opacity: 1;
  pointer-events: all;
}

.mobile-menu__close {
  position: absolute;
  top: var(--space-6);
  right: var(--padding-x);
  background: none;
  border: none;
  color: var(--color-text);
  font-size: var(--text-xl);
  cursor: pointer;
  opacity: 0.6;
  transition: opacity 0.2s ease;
}

.mobile-menu__close:hover {
  opacity: 1;
}

.mobile-menu__list {
  list-style: none;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-8);
}

.mobile-menu__link {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 300;
  letter-spacing: 0.04em;
  color: var(--color-text);
  text-decoration: none;
  transition: color 0.3s ease;
}

.mobile-menu__link:hover {
  color: var(--color-accent);
}

/* ── Responsive ────────────────────────────────────── */

@media (max-width: 768px) {
  .header-nav {
    display: none;
  }

  .header-actions .btn-primary {
    display: none;
  }

  .hamburger {
    display: flex;
  }
}