.site-header {
  position: absolute;
  top: 2.1rem;
  left: 0;
  right: 0;
  z-index: 40;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  background: transparent;
  color: #fff;
  transition: background 0.25s ease, color 0.25s ease;
}

.site-header.is-solid {
  position: fixed;
  top: 0;
  background: #fff;
  color: #000;
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.08);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  width: 100%;
  padding-inline: var(--pad-x);
  margin-inline: auto;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  color: inherit;
  flex-shrink: 0;
  line-height: 1;
}

.brand__mark {
  display: grid;
  gap: 0.28rem;
  width: 0.7rem;
}

.brand__sq {
  width: 0.55rem;
  height: 0.55rem;
  background: currentColor;
}

.brand__sq:last-child {
  border-radius: 50%;
}

.site-header.is-solid .brand__sq:first-child {
  background: var(--expo);
}

.site-header.is-solid .brand__sq:last-child {
  background: var(--signal);
}

.brand__word {
  display: grid;
  gap: 0.05rem;
}

.brand__dm {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.04em;
  line-height: 1;
}

.brand__exco {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  line-height: 1;
  text-transform: uppercase;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.1rem;
}

.site-nav__links {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.site-nav__links a {
  font-size: 0.8rem;
  font-weight: 400;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: inherit;
}

.site-header.is-solid .site-nav__links a[data-nav="exhibit"] {
  color: var(--expo);
}

.site-header.is-solid .site-nav__links a[data-nav="speak"] {
  color: var(--signal);
}

.site-nav__actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* Original tickets-btn: light rect, not pill */
.btn--ticket {
  background: #fff;
  color: #000;
  border: 1px solid #fff;
  text-transform: none;
  letter-spacing: 0;
  font-size: 0.85rem;
  font-weight: 400;
  min-height: 2.25rem;
  padding-inline: 1rem;
  border-radius: 0;
}

.site-header.is-solid .btn--ticket {
  background: #fff;
  color: #000;
  border-color: #000;
}

.site-header.is-solid .btn--ticket:hover {
  background: #000;
  color: #fff;
}

.btn--ticket:hover {
  background: #fff;
  color: #000;
}

/* Keep Register — rectangular like site CTAs, not rounded AI pill */
.btn--register {
  background: transparent;
  color: inherit;
  border: 1px solid currentColor;
  text-transform: none;
  letter-spacing: 0;
  font-size: 0.85rem;
  font-weight: 400;
  min-height: 2.25rem;
  padding-inline: 0.95rem;
  border-radius: 0;
}

.btn--register:hover {
  background: rgba(255, 255, 255, 0.12);
}

.site-header.is-solid .btn--register:hover {
  background: rgba(0, 0, 0, 0.06);
}

.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: 0.1rem;
}

.lang-switch__btn {
  min-width: 1.65rem;
  min-height: 1.5rem;
  padding: 0;
  border: 0;
  background: transparent;
  color: inherit;
  font-size: 0.72rem;
  font-weight: 500;
  text-transform: uppercase;
  cursor: pointer;
  opacity: 0.65;
}

.lang-switch__btn.is-active {
  opacity: 1;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.nav-search {
  width: 2rem;
  height: 2rem;
  display: grid;
  place-items: center;
  color: inherit;
  background: transparent;
  border: 0;
  cursor: pointer;
}

.nav-toggle {
  display: none;
  width: 2.5rem;
  height: 2.5rem;
  border: 0;
  background: transparent;
  color: inherit;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 1.2rem;
  height: 2px;
  margin: 5px auto;
  background: currentColor;
}

@media (max-width: 980px) {
  .nav-toggle {
    display: block;
  }

  .site-nav {
    position: absolute;
    top: var(--nav-h);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0.75rem;
    padding: 1rem var(--pad-x);
    background: #fff;
    color: #000;
    transform: translateY(-120%);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.35s ease, opacity 0.25s ease;
  }

  .site-header.is-open .site-nav {
    transform: none;
    opacity: 1;
    pointer-events: auto;
  }

  .site-nav__links,
  .site-nav__actions {
    flex-direction: column;
    align-items: stretch;
  }

  .site-nav__links a,
  .site-nav__actions .btn {
    width: 100%;
    justify-content: center;
  }
}