.mathus-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, 0.97);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(10, 47, 107, 0.08);
}

.mathus-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-4);
  min-height: 84px;
  padding: 0.4rem 0;
}

.mathus-header__brand {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
}

.mathus-header__logo {
  display: block;
  width: 180px;
  height: auto;
}

.mathus-header__nav {
  display: none;
  gap: var(--spacing-4);
}

.mathus-header__nav a,
.mathus-header__phone {
  text-decoration: none;
  color: var(--color-text-muted);
  font-weight: 600;
}

.mathus-header__nav a:hover,
.mathus-header__nav a:focus-visible,
.mathus-header__phone:hover,
.mathus-header__phone:focus-visible {
  color: var(--color-accent);
}

.mathus-header__phone {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.8rem 1rem;
  border-radius: 999px;
  background: #ffffff;
  color: var(--color-accent-strong);
  border: 1px solid rgba(10, 47, 107, 0.1);
  box-shadow: 0 10px 24px rgba(10, 47, 107, 0.06);
}

@media (min-width: 1024px) {
  .mathus-header__nav {
    display: flex;
  }
}