.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(var(--blur-glass-md));
  background: linear-gradient(120deg, rgba(255, 255, 255, 0.9), rgba(183, 227, 255, 0.92));
  border-bottom: 1px solid rgba(148, 163, 184, 0.3);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-3);
  padding-bottom: var(--space-3);
  gap: var(--space-4);
}

.site-header__brand {
  display: flex;
  align-items: center;
  min-width: 0;
}

.site-header__logo-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--color-text);
}

.site-header__logo-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 18px;
  background: radial-gradient(circle at 0 0, var(--color-sky), transparent 60%),
    radial-gradient(circle at 100% 100%, var(--color-lavender), transparent 60%),
    linear-gradient(135deg, #40a4ff, #7ee9c2);
  color: #ffffff;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.1rem;
  box-shadow: var(--shadow-soft);
}

.site-header__brand-text {
  display: flex;
  flex-direction: column;
}

.site-header__brand-title {
  font-family: var(--font-display);
  font-size: var(--font-size-lg);
  font-weight: 600;
  letter-spacing: -0.02em;
}

.site-header__brand-tagline {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.18em;
}

.site-header__nav {
  margin-left: auto;
}

.site-header__nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  list-style: none;
  padding-left: 0;
}

.site-header__nav-item--primary {
  margin-left: var(--space-2);
}

.site-header__nav-link {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-soft);
  padding: 0.35rem 0;
  border-radius: var(--radius-pill);
  position: relative;
}

.site-header__nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -0.2rem;
  height: 2px;
  border-radius: 999px;
  background: linear-gradient(90deg, #40a4ff, #7ee9c2, #ffb6a0);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform var(--transition-base);
}

.site-header__nav-link:hover::after,
.site-header__nav-link:focus-visible::after {
  transform: scaleX(1);
}

.site-header__nav-link--button {
  padding: 0.6rem 1.2rem;
  background: linear-gradient(135deg, #40a4ff, #7c6cff);
  color: #ffffff;
  box-shadow: 0 10px 30px rgba(64, 164, 255, 0.4);
}

.site-header__nav-link--button::after {
  display: none;
}

.site-header__nav-link--button:hover,
.site-header__nav-link--button:focus-visible {
  transform: translateY(-1px);
}

.site-header__toggle {
  display: none;
  width: 40px;
  height: 40px;
  border-radius: 999px;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid rgba(148, 163, 184, 0.6);
  cursor: pointer;
}

.site-header__toggle-bar {
  width: 18px;
  height: 2px;
  border-radius: 999px;
  background: var(--color-text);
  transition: transform var(--transition-base), opacity var(--transition-base), translate var(--transition-base);
}

.site-header__toggle-bar + .site-header__toggle-bar {
  margin-top: 3px;
}

.site-header__toggle.is-active .site-header__toggle-bar:nth-child(1) {
  transform: rotate(45deg);
  translate: 0 5px;
}

.site-header__toggle.is-active .site-header__toggle-bar:nth-child(2) {
  opacity: 0;
}

.site-header__toggle.is-active .site-header__toggle-bar:nth-child(3) {
  transform: rotate(-45deg);
  translate: 0 -5px;
}

@media (max-width: 799px) {
  .site-header__inner {
    padding-top: var(--space-2);
    padding-bottom: var(--space-2);
  }
  .site-header__toggle {
    display: inline-flex;
    flex-direction: column;
  }
  .site-header__nav {
    position: fixed;
    inset: 72px 0 auto 0;
    background: radial-gradient(circle at top left, rgba(183, 227, 255, 0.95), rgba(255, 213, 197, 0.95));
    backdrop-filter: blur(var(--blur-glass-md));
    box-shadow: 0 18px 45px rgba(15, 23, 42, 0.25);
    transform: translateY(-110%);
    opacity: 0;
    visibility: hidden;
    transition: transform var(--transition-slow), opacity var(--transition-slow), visibility var(--transition-slow);
  }
  .site-header__nav-list {
    flex-direction: column;
    align-items: flex-start;
    padding: var(--space-4) var(--space-4) var(--space-6);
    gap: var(--space-2);
  }
  .site-header__nav-item--primary {
    width: 100%;
    margin-left: 0;
    margin-top: var(--space-2);
  }
  .site-header__nav-link--button {
    display: inline-flex;
    width: 100%;
    justify-content: center;
  }
  .site-header__nav-link {
    padding: 0.5rem 0.2rem;
    font-size: var(--font-size-md);
  }
  .site-header__nav-link::after {
    display: none;
  }
  .site-header__nav.is-open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }
}

@media (min-width: 800px) {
  .site-header__nav-list {
    gap: var(--space-5);
  }
}

@media (prefers-reduced-motion: reduce) {
  .site-header__nav,
  .site-header__toggle-bar,
  .site-header__nav-link--button {
    transition: none;
  }
}