.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  width: 100%;
  padding: 20px var(--page-pad);
  display: flex;
  align-items: center;
  z-index: 50;
  background: transparent;
  backdrop-filter: blur(0px);
  -webkit-backdrop-filter: blur(0px);
  border-bottom: 1px solid transparent;
  transition: background .3s var(--ease), border-color .3s var(--ease);
}

.site-header__inner {
  max-width: var(--page-max);
  margin: 0 auto;
  width: 100%;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 24px;
}

.site-header__brand {
  display: inline-flex; align-items: center; gap: 10px;
  font-weight: 700; letter-spacing: -.02em; font-size: 17px;
}
.site-header__mark {
  width: 34px; height: 34px; border-radius: 10px;
  display: grid; place-items: center;
  background: var(--c-panel);
  border: 1px solid var(--c-line-2);
  color: var(--c-text);
}
.site-header__name em {
  font-style: normal;
  color: var(--c-text-3);
  font-weight: 500;
}

.site-header__nav {
  display: flex; gap: 28px;
  justify-content: center;
}
.site-header__nav a {
  color: var(--c-text-2);
  font-size: 14px;
  position: relative;
  transition: color .2s var(--ease);
}
.site-header__nav a:hover { color: var(--c-text); }
.site-header__nav a::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -6px; height: 1px;
  background: var(--c-text); transform: scaleX(0); transform-origin: left;
  transition: transform .3s var(--ease);
}
.site-header__nav a:hover::after { transform: scaleX(1); }

.site-header__actions { display: inline-flex; align-items: center; gap: 14px; }
.site-header__login { color: var(--c-text-2); font-size: 14px; }
.site-header__login:hover { color: var(--c-text); }

.site-header__burger {
  display: none;
  padding: 6px;
  border: none;
  background: none;
  color: var(--c-accent);
  align-items: center;
  justify-content: center;
  transition: opacity .2s;
}
.site-header__burger:hover { opacity: .65; }

/* ── Mobile menu overlay ───────────────────────────────── */
.mobile-menu {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: var(--c-bg);
  display: flex;
  flex-direction: column;
  padding: 0 var(--page-pad);
  opacity: 0;
  pointer-events: none;
  transform: translateY(-10px);
  transition: opacity .3s var(--ease), transform .3s var(--ease);
}
.mobile-menu.is-open {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.mobile-menu__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 0;
  flex-shrink: 0;
  border-bottom: 1px solid var(--c-line);
}

.mobile-menu__close {
  padding: 6px;
  border: none;
  background: none;
  color: var(--c-text-3);
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  transition: color .2s;
}
.mobile-menu__close:hover { color: var(--c-text); }

.mobile-menu__nav {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  padding-top: 40px;
}

.mobile-menu__link {
  display: flex;
  align-items: center;
  gap: 14px;
  font-size: 20px;
  font-weight: 400;
  letter-spacing: -.01em;
  color: var(--c-text);
  line-height: 1.3;
  padding: 13px 0;
  opacity: 0;
  transform: translateY(14px);
  transition:
    color .25s var(--ease),
    opacity .35s var(--ease),
    transform .35s var(--ease);
}
.mobile-menu__link::before {
  content: '';
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--c-accent);
  flex-shrink: 0;
}
.mobile-menu__link:hover { color: var(--c-text-2); }
.mobile-menu.is-open .mobile-menu__link:nth-child(1) { opacity: 1; transform: none; transition-delay: .07s; }
.mobile-menu.is-open .mobile-menu__link:nth-child(2) { opacity: 1; transform: none; transition-delay: .12s; }
.mobile-menu.is-open .mobile-menu__link:nth-child(3) { opacity: 1; transform: none; transition-delay: .17s; }
.mobile-menu.is-open .mobile-menu__link:nth-child(4) { opacity: 1; transform: none; transition-delay: .22s; }

.mobile-menu__footer {
  padding: 24px 0 max(24px, env(safe-area-inset-bottom));
  flex-shrink: 0;
  opacity: 0;
  transform: translateY(8px);
  transition: opacity .35s var(--ease), transform .35s var(--ease);
}
.mobile-menu.is-open .mobile-menu__footer {
  opacity: 1;
  transform: none;
  transition-delay: .27s;
}

.mobile-menu__cta {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  padding: 18px 24px;
  border-radius: var(--r-lg);
  border: 1.5px solid var(--c-accent);
  color: var(--c-accent);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -.01em;
  background: transparent;
  transition: background .25s var(--ease), box-shadow .25s var(--ease);
}
.mobile-menu__cta:hover {
  background: oklch(0.505 0.293 285.7 / .1);
  box-shadow: 0 0 0 1px oklch(0.505 0.293 285.7 / .4), 0 4px 24px oklch(0.505 0.293 285.7 / .18);
}

.site-header.is-scrolled {
  background: rgba(8,8,11,.82);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--c-line);
  transition: background .3s var(--ease), border-color .3s var(--ease), backdrop-filter .3s var(--ease), -webkit-backdrop-filter .3s var(--ease);
}

@media (max-width: 960px) {
  .site-header__inner { grid-template-columns: auto 1fr auto; }
  .site-header__nav { display: none; }
  .site-header__actions .site-header__login { display: none; }
  .site-header__burger { display: inline-flex; }
}
@media (max-width: 520px) {
  .site-header__actions .btn { display: none; }
}