/* Sticky header, brand, and responsive navigation */

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 1000;
  height: var(--header-height);
  border-bottom: 1px solid transparent;
  background: linear-gradient(180deg, rgba(244, 247, 249, 0.98), rgba(244, 247, 249, 0.82));
  transition:
    background-color var(--transition-fast),
    border-color var(--transition-fast),
    box-shadow var(--transition-fast);
}

.site-header.is-scrolled {
  border-bottom-color: var(--color-border);
  background: rgba(255, 255, 255, 0.94);
  box-shadow: 0 16px 40px rgba(22, 58, 78, 0.12);
  backdrop-filter: blur(16px);
}

.site-header__inner {
  position: relative;
  display: flex;
  width: min(calc(100% - 64px), var(--container));
  height: 100%;
  margin-inline: auto;
  align-items: center;
  justify-content: space-between;
}

.brand {
  position: relative;
  z-index: 2;
  display: inline-flex;
  min-height: 48px;
  align-items: center;
}

.brand__mark {
  display: block;
  width: 96px;
  height: auto;
  flex: 0 0 auto;
  filter: brightness(0) saturate(100%) invert(16%) sepia(21%) saturate(1367%)
    hue-rotate(156deg) brightness(89%) contrast(92%);
}

.primary-navigation {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
}

.primary-navigation__list {
  display: flex;
  margin: 0;
  padding: 0;
  align-items: center;
  gap: clamp(18px, 2vw, 36px);
  list-style: none;
}

.primary-navigation__list a {
  position: relative;
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  color: var(--color-text-soft);
  font-size: 14px;
  font-weight: 500;
  white-space: nowrap;
  transition: color var(--transition-fast);
}

.primary-navigation__list a::after {
  position: absolute;
  right: 0;
  bottom: 3px;
  left: 0;
  height: 1px;
  background: var(--color-accent-bright);
  content: "";
  opacity: 0;
  transform: scaleX(0.35);
  transition:
    opacity var(--transition-fast),
    transform var(--transition-fast);
}

.primary-navigation__list a:hover,
.primary-navigation__list a[aria-current="location"] {
  color: var(--color-text);
}

.primary-navigation__list a:hover::after,
.primary-navigation__list a[aria-current="location"]::after {
  opacity: 1;
  transform: scaleX(1);
}

.primary-navigation__list a > span,
.primary-navigation__header,
.primary-navigation__meta,
.menu-toggle {
  display: none;
}

@media (max-width: 1100px) {
  .site-header__inner {
      width: min(calc(100% - 48px), var(--container));
    }

  .menu-toggle {
      position: relative;
      z-index: 3;
      display: flex;
      width: 48px;
      height: 48px;
      padding: 0;
      align-items: center;
      justify-content: center;
      border: 1px solid var(--color-border);
      border-radius: var(--radius-sm);
      background: var(--color-panel);
      cursor: pointer;
    }

  .menu-toggle span {
      position: absolute;
      width: 20px;
      height: 1px;
      background: var(--color-text);
      transition: transform var(--transition-fast);
    }

  .menu-toggle span:first-child {
      transform: translateY(-4px);
    }

  .menu-toggle span:last-child {
      transform: translateY(4px);
    }

  .menu-toggle[aria-expanded="true"] span:first-child {
      transform: rotate(45deg);
    }

  .menu-toggle[aria-expanded="true"] span:last-child {
      transform: rotate(-45deg);
    }

  .primary-navigation {
      position: fixed;
      top: 0;
      right: 0;
      left: auto;
      z-index: 2;
      display: flex;
      width: min(420px, 90vw);
      height: 100dvh;
      padding: 28px clamp(24px, 5vw, 48px) 36px;
      flex-direction: column;
      border-left: 1px solid var(--color-border);
      background:
        linear-gradient(rgba(0, 119, 184, 0.035) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 119, 184, 0.035) 1px, transparent 1px),
        rgba(248, 251, 253, 0.98);
      background-size: 32px 32px, 32px 32px, auto;
      box-shadow: -20px 0 60px rgba(22, 58, 78, 0.18);
      transform: translateX(102%);
      visibility: hidden;
      transition:
        transform var(--transition-medium),
        visibility 0s linear var(--transition-medium);
    }

  .primary-navigation.is-open {
      transform: translateX(0);
      visibility: visible;
      transition:
        transform var(--transition-medium),
        visibility 0s;
    }

  .primary-navigation__header {
      display: flex;
      padding-bottom: 24px;
      align-items: center;
      justify-content: space-between;
      border-bottom: 1px solid var(--color-border);
      color: var(--color-accent-bright);
      font-family: var(--font-tech);
      font-size: 10px;
      letter-spacing: 0.18em;
    }

  .primary-navigation__list {
      display: block;
      margin-top: 36px;
    }

  .primary-navigation__list li {
      border-bottom: 1px solid var(--color-border);
    }

  .primary-navigation__list a {
      min-height: 70px;
      gap: 18px;
      font-size: 18px;
    }

  .primary-navigation__list a::after {
      top: 50%;
      right: 0;
      bottom: auto;
      left: auto;
      width: 18px;
      height: 1px;
    }

  .primary-navigation__list a > span {
      display: inline;
      color: var(--color-accent-bright);
      font-family: var(--font-tech);
      font-size: 9px;
    }

  .primary-navigation__meta {
      display: block;
      margin: auto 0 0;
      color: var(--color-text-muted);
      font-family: var(--font-tech);
      font-size: 9px;
      letter-spacing: 0.15em;
    }

  .menu-backdrop {
      position: fixed;
      inset: 0;
      z-index: 1;
      background: rgba(16, 42, 58, 0.36);
      opacity: 0;
      pointer-events: none;
      visibility: hidden;
      transition:
        opacity var(--transition-medium),
        visibility var(--transition-medium);
      backdrop-filter: blur(4px);
    }

  .menu-backdrop.is-visible {
      opacity: 1;
      pointer-events: auto;
      visibility: visible;
    }
}

@media (max-width: 600px) {
  .site-header__inner {
      width: calc(100% - 40px);
    }

  .brand__mark {
      width: 88px;
    }
}