.site-header {
  position: sticky; top: 0; z-index: 40;
  background: color-mix(in srgb, var(--color-bg) 88%, transparent);
  backdrop-filter: blur(12px); border-bottom: 1px solid var(--color-line);
}
.site-header__inner { display: flex; align-items: center; justify-content: space-between; gap: 24px; min-height: var(--header-h); padding-block: 10px; }

.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; font-weight: 700; font-size: 20px; letter-spacing: -0.02em; }
.brand img { width: 36px; height: 36px; border-radius: 50%; background: #fff; transition: transform 0.6s var(--ease); }
.brand:hover img { transform: rotate(-20deg); }

.nav { display: flex; align-items: center; gap: 2px; }
.nav__link, .nav__trigger {
  display: inline-flex; align-items: center; gap: 6px; padding: 9px 13px; border-radius: 8px;
  color: var(--color-muted); font: inherit; font-size: 17px; font-weight: 500; text-decoration: none;
  background: none; border: 0; cursor: pointer; transition: background 0.2s, color 0.2s;
}
.nav__link:hover, .nav__trigger:hover, .nav__trigger[aria-expanded="true"] { background: var(--color-tint); color: var(--color-ink); }
.nav__link[aria-current="page"], .nav__trigger.is-current { color: var(--color-ink); box-shadow: inset 0 -2px 0 var(--color-primary); }
.nav__trigger svg { transition: transform 0.3s; }
.nav__trigger[aria-expanded="true"] svg { transform: rotate(180deg); }

.nav__menu { position: relative; }
.mega {
  position: absolute; top: calc(100% + 12px); left: -12px; width: min(660px, 90vw);
  background: var(--color-surface); border: 1px solid var(--color-line); border-radius: 16px;
  box-shadow: 0 34px 60px -28px rgb(0 0 0 / 40%); padding: 10px;
  opacity: 0; visibility: hidden; transform: translateY(-8px);
  transition: opacity 0.25s, transform 0.25s var(--ease), visibility 0.25s;
}
.mega::before { content: ""; position: absolute; inset: -14px 0 auto; height: 14px; }
.nav__menu.is-open .mega { opacity: 1; visibility: visible; transform: none; }
@media (hover: hover) {
  .nav__menu:hover .mega { opacity: 1; visibility: visible; transform: none; }
}
.mega__grid { display: grid; grid-template-columns: 1fr 1fr; gap: 2px; }
.mega a { display: flex; gap: 12px; align-items: flex-start; padding: 13px 14px; border-radius: 10px; text-decoration: none; transition: background 0.2s; }
.mega a:hover, .mega a:focus-visible { background: var(--color-tint); }
.mega__num {
  flex: none; width: 26px; height: 26px; border-radius: 7px; display: grid; place-items: center;
  background: var(--color-tint); color: var(--color-primary-text); font-size: 12px; font-weight: 600; transition: background 0.2s, color 0.2s;
}
.mega a:hover .mega__num { background: var(--color-primary); color: var(--color-on-primary); }
.mega strong { display: block; font-size: 16px; font-weight: 600; }
.mega small { display: block; font-size: 14px; color: var(--color-muted); line-height: 1.4; }
.mega__foot { border-top: 1px dashed var(--color-line); margin-top: 6px; padding: 12px 14px 6px; }
.mega__foot a { display: inline-flex; padding: 0; color: var(--color-accent-text); font-weight: 600; font-size: 15px; }
.mega__foot a:hover { background: none; }

.menu-toggle { display: none; }

@media (max-width: 1040px) {
  .site-header { backdrop-filter: none; background: var(--color-bg); }
  .site-header__cta { display: none; }
  .menu-toggle {
    display: inline-flex; align-items: center; gap: 8px; border: 1.5px solid var(--color-line); background: var(--color-surface);
    border-radius: 10px; padding: 10px 14px; font-weight: 600; cursor: pointer;
  }
  .nav {
    position: fixed; inset: var(--header-h) 0 0; z-index: 39; background: var(--color-bg);
    flex-direction: column; align-items: stretch; gap: 4px; padding: 20px var(--gutter) 40px; overflow-y: auto;
    opacity: 0; visibility: hidden; transform: translateY(-8px); transition: opacity 0.25s, transform 0.25s var(--ease), visibility 0.25s;
  }
  .site-header.is-open .nav { opacity: 1; visibility: visible; transform: none; }
  .nav__link, .nav__trigger { font-size: 20px; padding: 14px 12px; justify-content: space-between; width: 100%; }
  .mega { position: static; width: auto; box-shadow: none; border: 0; padding: 0 0 8px; display: none; opacity: 1; visibility: visible; transform: none; }
  .nav__menu.is-open .mega { display: block; }
  .nav__menu:hover .mega { display: none; }
  .nav__menu.is-open:hover .mega { display: block; }
  .mega__grid { grid-template-columns: 1fr; }
  .nav__mobile-cta { display: flex !important; margin-top: 16px; }
}
.nav__mobile-cta { display: none !important; }