.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  background: rgba(249, 252, 255, 0.98);
  border-bottom: 1px solid var(--color-line);
  box-shadow: 0 5px 15px rgba(39, 76, 101, 0.07);
}

.site-header__grid {
  display: grid;
  grid-template-columns: 210px minmax(0, 1fr) auto;
  grid-template-rows: auto auto;
  align-items: center;
  column-gap: 1.35rem;
  row-gap: 0.7rem;
  min-height: 136px;
  padding: 0.7rem 1.25rem 0.8rem;
}

.brand-link {
  position: relative;
  isolation: isolate;
  grid-column: 1;
  grid-row: 1 / 3;
  align-self: stretch;
  display: flex;
  align-items: center;
  justify-content: flex-start;
  min-width: 0;
  text-decoration: none;
}

.brand-link__glow {
  position: absolute;
  z-index: -1;
  inset: 10% -2% 7%;
  border-radius: 48% 52% 50% 50%;
  background:
    radial-gradient(ellipse at center, rgba(255, 255, 255, 0.99) 0%, rgba(232, 246, 255, 0.86) 44%, rgba(190, 225, 246, 0.34) 68%, rgba(190, 225, 246, 0) 88%);
  filter: blur(9px);
  pointer-events: none;
}

.brand-link__mark {
  display: block;
  width: 205px;
  height: 116px;
  object-fit: contain;
  filter: drop-shadow(0 7px 14px rgba(35, 81, 113, 0.13));
  -webkit-mask-image: linear-gradient(to right, transparent 0%, rgba(0, 0, 0, 0.58) 7%, #000 18%, #000 82%, rgba(0, 0, 0, 0.58) 93%, transparent 100%);
  mask-image: linear-gradient(to right, transparent 0%, rgba(0, 0, 0, 0.58) 7%, #000 18%, #000 82%, rgba(0, 0, 0, 0.58) 93%, transparent 100%);
  -webkit-mask-repeat: no-repeat;
  mask-repeat: no-repeat;
  -webkit-mask-size: 100% 100%;
  mask-size: 100% 100%;
}

.site-header__identity {
  grid-column: 2;
  grid-row: 1;
  min-width: 0;
  display: grid;
  align-content: center;
  gap: 0.7rem;
}

.brand-claim {
  width: 100%;
  margin: 0;
  color: var(--color-text);
  font-size: 1rem;
  font-weight: 720;
  letter-spacing: 0.01em;
  text-align: center;
}

.header-help {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  grid-column: 3;
  grid-row: 1;
  align-self: start;
  min-width: 112px;
  border-color: rgba(67, 145, 198, 0.48);
  background: linear-gradient(145deg, rgba(255, 255, 255, 0.98), rgba(227, 243, 253, 0.96));
  box-shadow: 0 7px 18px rgba(38, 91, 128, 0.14), inset 0 1px 0 rgba(255, 255, 255, 0.95), 0 0 0 1px rgba(199, 225, 241, 0.55);
  color: var(--color-text);
}

.header-help::before {
  content: "";
  position: absolute;
  z-index: -1;
  inset: -35% 18% auto;
  height: 70%;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(115, 194, 240, 0.42), rgba(115, 194, 240, 0) 70%);
}

.header-help img {
  width: 30px;
  height: 30px;
  object-fit: contain;
  filter: drop-shadow(0 0 8px rgba(55, 144, 207, 0.42));
}

.header-help:hover {
  border-color: rgba(45, 134, 193, 0.72);
  background: linear-gradient(145deg, #fff, #dceffa);
  box-shadow: 0 9px 22px rgba(38, 91, 128, 0.18), 0 0 18px rgba(95, 181, 231, 0.18);
}

.site-search-row {
  grid-column: 2 / 4;
  grid-row: 2;
  min-width: 0;
}

.nav-toggle {
  grid-column: 3;
  grid-row: 1;
}

.help-launcher {
  position: fixed;
  right: 1rem;
  bottom: 1rem;
  z-index: 150;
  display: flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.3rem 0.65rem 0.3rem 0.3rem;
  border: 1px solid rgba(45, 134, 193, 0.35);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.96);
  box-shadow: var(--shadow-soft);
  font-weight: 750;
  cursor: pointer;
}

.help-launcher img {
  width: 36px;
  height: 36px;
  object-fit: contain;
  filter: drop-shadow(0 0 10px rgba(62, 146, 208, 0.35));
}