nicco.io/src/components/Nav.astro

---
const { pathname } = Astro.url

const routes = [
  { name: 'About', href: '/about' },
  { name: 'Projects', href: '/projects' },
  { name: 'Blog', href: '/blog' },
  { name: 'Rest', href: '/rest' },
]
---

<nav>
  <a href="/">
    <h1 class:list={{ active: pathname === '/' }}>NB</h1>
  </a>
  <ul>
    <!-- <li>
      <a href="/search">
        <Icon icon="search-outline" />
      </a>
    </li> -->
    {
      routes.map(({ href, name }) => (
        <li>
          <a {href}>
            <span>{name}</span>
            <div class:list={{ active: pathname.startsWith(href) }} />
          </a>
        </li>
      ))
    }
  </ul>
</nav>

<style>
  nav {
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
  }

  /* OLD */
  nav :global(*) {
    box-sizing: initial;
  }

  nav {
    padding-top: env(safe-area-inset-top);
    padding-bottom: env(safe-area-inset-bottom);
    width: 3em;
    height: 100%;
    background-color: var(--clr-primary);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    align-items: center;
    border-right: 0.1em solid var(--clr-secondary);
  }

  ul {
    list-style: none;
    margin: 0;
    padding: 0;
    max-height: 100%;
    overflow: auto;
  }

  a {
    writing-mode: vertical-rl;
    padding: 1em;
    text-decoration: none;
  }

  li a {
    line-height: 1em;
    width: 1em;
    position: relative;
  }

  li a span {
    z-index: 5;
    position: relative;
  }

  li a div {
    z-index: 4;
    width: 0.125em;
    height: 100%;
    top: 0;
    left: 1.12em;
    position: absolute;
    transition: all 500ms ease;
  }
  li a div.active {
    background-color: var(--clr-secondary);
  }
  li:hover a div:not(.active) {
    background-color: var(--clr-light);
  }

  h1 {
    margin: 0;
    writing-mode: horizontal-tb;
    letter-spacing: -0.15em;
    width: 1.15em;
    font-size: 1.5em;
  }

  h1.active {
    box-shadow: 0 0.1em var(--clr-secondary);
  }

  @media (max-width: 30em) {
    nav {
      width: 2.5em;
    }

    a {
      padding: 0.5em;
    }

    li a div {
      transform: translateX(-0.5em);
    }
  }
</style>