/* =========================================================
   Header / navigation
   ========================================================= */

.site-header {
  position: relative;
  z-index: 20;
  background: var(--hero-bg-top); /* same surface as the hero, no seam */
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--header-h);
  gap: 1.5rem;
}

.nav__logo img {
  width: auto;
  height: 40px;
}

.nav__menu {
  display: flex;
  align-items: center;
  gap: 2.5rem;
}

.nav__links {
  display: flex;
  gap: 2.25rem;
}

.nav__links a {
  position: relative;
  font-weight: 600;
  font-size: 0.98rem;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.2s ease;
}

.nav__links a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -4px;
  width: 100%;
  height: 2px;
  border-radius: 2px;
  background: var(--color-rose);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s var(--ease-out);
}

.nav__links a:hover {
  color: var(--color-white);
}

.nav__links a:hover::after {
  transform: scaleX(1);
}

/* Hamburger (hidden on desktop) */
.nav__toggle {
  display: none;
  position: relative;
  width: 44px;
  height: 44px;
  border: 1px solid rgba(255, 228, 228, 0.18);
  border-radius: 12px;
  background: transparent;
  cursor: pointer;
}

.nav__toggle-bar {
  position: absolute;
  left: 12px;
  right: 12px;
  height: 2px;
  border-radius: 2px;
  background: var(--color-rose-light);
  transition: transform 0.3s var(--ease-out);
}

.nav__toggle-bar:nth-of-type(2) { top: 17px; }
.nav__toggle-bar:nth-of-type(3) { top: 25px; }

.nav__toggle[aria-expanded="true"] .nav__toggle-bar:nth-of-type(2) {
  transform: translateY(4px) rotate(45deg);
}

.nav__toggle[aria-expanded="true"] .nav__toggle-bar:nth-of-type(3) {
  transform: translateY(-4px) rotate(-45deg);
}

/* ---------- Tablet & mobile ---------- */
@media (max-width: 900px) {
  :root {
    --header-h: 72px;
  }

  .nav__logo img {
    height: 34px;
  }

  .nav__toggle {
    display: block;
  }

  .nav__menu {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 1.25rem;
    padding: 1.25rem var(--gutter) 1.75rem;
    background: var(--hero-bg-top);
    border-bottom: 1px solid rgba(255, 228, 228, 0.08);
    box-shadow: 0 24px 40px -20px rgba(0, 0, 0, 0.6);
    /* closed state */
    visibility: hidden;
    opacity: 0;
    transform: translateY(-8px);
    transition: opacity 0.25s ease, transform 0.25s var(--ease-out), visibility 0s linear 0.25s;
  }

  .nav__menu.is-open {
    visibility: visible;
    opacity: 1;
    transform: none;
    transition-delay: 0s;
  }

  .nav__links {
    flex-direction: column;
    gap: 0;
  }

  .nav__links a {
    display: block;
    padding: 0.85rem 0;
    font-size: 1.05rem;
    border-bottom: 1px solid rgba(255, 228, 228, 0.08);
  }

  .nav__links a::after {
    display: none;
  }

  .nav__menu .btn {
    justify-content: center;
  }
}