/* ==================== HEADER ==================== */

.site-header {
  position: sticky;
  z-index: 30;
  top: 0;
  border-bottom: 1px solid transparent;
  background: transparent;
  transition:
    background-color var(--transition-fast),
    border-color var(--transition-fast),
    box-shadow var(--transition-fast),
    backdrop-filter var(--transition-fast);
}

.site-header.is-scrolled {
  border-bottom-color: color-mix(in srgb, var(--color-border) 72%, transparent);
  background: color-mix(in srgb, var(--color-page) 72%, transparent);
  box-shadow: 0 0.5rem 2rem rgb(0 0 0 / 4%);
  backdrop-filter: blur(1.125rem) saturate(135%);
}

.site-header__inner {
  display: flex;
  min-height: 4.5rem;
  align-items: center;
  gap: var(--space-5);
}

.site-brand {
  display: inline-flex;
  width: max-content;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--font-size-sm);
  font-weight: 650;
  letter-spacing: -0.02em;
}

.site-brand__mark {
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  background: var(--color-brand);
  box-shadow: 0 0 0 0.22rem var(--color-brand-soft);
}

.site-menu {
  display: flex;
  min-width: 0;
  flex: 1;
  align-items: center;
}

.site-menu__header,
.site-menu__socials,
.menu-toggle,
.menu-close,
.menu-backdrop,
.site-nav__index,
.site-menu__theme > span {
  display: none;
}

.site-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-6);
  margin-inline: auto;
}

.site-nav a {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  font-weight: 500;
  transition: color var(--transition-fast);
}

.site-menu__footer {
  display: flex;
  flex: 0 0 auto;
  align-items: center;
}

@media (hover: hover) {
  .site-nav a:hover {
    color: var(--color-text);
  }
}

@media (max-width: 43rem) {
  .site-header.is-scrolled {
    background: color-mix(in srgb, var(--color-page) 78%, transparent);
    backdrop-filter: none;
  }

  .site-header.menu-is-open {
    border-bottom-color: transparent;
    background: transparent;
    box-shadow: none;
    backdrop-filter: none;
  }

  .site-header__inner {
    min-height: 4.25rem;
    justify-content: space-between;
    gap: var(--space-4);
  }

  .menu-toggle,
  .menu-close {
    position: relative;
    display: inline-grid;
    width: 2.75rem;
    height: 2.75rem;
    cursor: pointer;
    place-items: center;
    padding: 0;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: color-mix(in srgb, var(--color-surface) 72%, transparent);
    color: var(--color-text);
  }

  .menu-toggle span,
  .menu-close span {
    position: absolute;
    width: 1.15rem;
    height: 1px;
    background: currentColor;
  }

  .menu-toggle span:first-child {
    transform: translateY(-0.22rem);
  }

  .menu-toggle span:last-child {
    width: 0.78rem;
    transform: translate(0.19rem, 0.22rem);
  }

  .menu-close span:first-child {
    transform: rotate(45deg);
  }

  .menu-close span:last-child {
    transform: rotate(-45deg);
  }

  .site-menu {
    position: fixed;
    z-index: 3;
    top: 0;
    right: 0;
    display: flex;
    width: min(26rem, 100%);
    height: 100vh;
    height: 100dvh;
    min-height: 32rem;
    overflow-y: auto;
    flex-direction: column;
    align-items: stretch;
    padding: var(--space-5);
    border-left: 1px solid var(--color-border);
    background: var(--color-page);
    box-shadow: -1.5rem 0 4rem rgb(0 0 0 / 18%);
    opacity: 0;
    pointer-events: none;
    transform: translateX(100%);
    transition:
      opacity 220ms ease,
      transform 320ms cubic-bezier(0.22, 1, 0.36, 1),
      visibility 0s linear 320ms;
    visibility: hidden;
  }

  .menu-is-open .site-menu {
    opacity: 1;
    pointer-events: auto;
    transform: translateX(0);
    transition-delay: 0s;
    visibility: visible;
  }

  .site-menu__header {
    display: flex;
    min-height: 2.75rem;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-4);
  }

  .site-nav {
    display: grid;
    width: 100%;
    gap: 0;
    margin: clamp(2.5rem, 9vh, 5rem) 0 var(--space-8);
  }

  .site-nav a {
    display: flex;
    min-height: 4.5rem;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-4);
    border-bottom: 1px solid var(--color-border);
    color: var(--color-text);
    font-size: clamp(1.55rem, 7vw, 2rem);
    font-weight: 600;
    letter-spacing: -0.035em;
  }

  .site-nav a:first-child {
    border-top: 1px solid var(--color-border);
  }

  .site-nav__index {
    display: inline;
    color: var(--color-text-subtle);
    font-family: var(--font-mono);
    font-size: var(--font-size-xs);
    font-weight: 500;
    letter-spacing: 0.04em;
  }

  .site-menu__footer {
    display: grid;
    gap: var(--space-5);
    margin-top: auto;
  }

  .site-menu__theme {
    display: flex;
    min-height: 4.5rem;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-4);
    padding: var(--space-3) 0;
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
  }

  .site-menu__theme > span {
    display: grid;
    gap: 0.15rem;
  }

  .site-menu__label {
    color: var(--color-text-subtle);
    font-size: var(--font-size-xs);
    font-weight: 500;
  }

  .site-menu__theme-value {
    color: var(--color-text);
    font-size: var(--font-size-sm);
    font-weight: 600;
  }

  .site-menu__theme .theme-toggle {
    border-color: var(--color-border);
    background: var(--color-surface);
  }

  .site-menu__socials {
    display: flex;
    align-items: center;
    gap: var(--space-2);
  }

  .site-menu__socials a {
    display: grid;
    width: 2.75rem;
    height: 2.75rem;
    place-items: center;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-surface);
    color: var(--color-text-muted);
    transition:
      background-color var(--transition-fast),
      border-color var(--transition-fast),
      color var(--transition-fast),
      transform var(--transition-fast);
  }

  .site-menu__socials svg {
    width: 1rem;
    height: 1rem;
    fill: none;
    stroke: currentColor;
    stroke-linecap: round;
    stroke-linejoin: round;
    stroke-width: 1.5;
  }

  .site-menu__socials a:first-child svg path {
    fill: currentColor;
    stroke: none;
  }

  .menu-backdrop {
    position: fixed;
    z-index: 2;
    inset: 0;
    display: block;
    width: 100%;
    height: 100%;
    cursor: pointer;
    padding: 0;
    border: 0;
    background: rgb(0 0 0 / 42%);
    opacity: 0;
    pointer-events: none;
    transition: opacity 220ms ease;
  }

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

  .menu-open {
    overflow: hidden;
  }
}

@media (max-width: 30rem) {
  .site-menu {
    width: 100%;
    border-left: 0;
    box-shadow: none;
  }
}

@media (hover: hover) and (max-width: 43rem) {
  .menu-toggle:hover,
  .menu-close:hover,
  .site-menu__socials a:hover {
    border-color: var(--color-border-strong);
    background: var(--color-surface-hover);
    color: var(--color-text);
  }

  .site-menu__socials a:hover {
    transform: translateY(-1px);
  }
}