@knadh/oat/css/sidebar.css

Ultra-lightweight, zero dependency, semantic HTML/CSS/JS UI library

@layer components {
  [data-sidebar-layout] {
    display: grid;
    grid-template-columns: 14rem 1fr;
    grid-template-rows: auto 1fr;
    height: 100dvh;

    > main {
      grid-row: 2;
      min-width: 0;
      overflow-y: auto;
    }

    > aside[data-sidebar] {
      grid-row: 2;
      min-height: 0;
      z-index: 1;
      background-color: var(--background);
      border-inline-end: 1px solid var(--border);
      box-shadow: var(--shadow-medium);
      display: flex;
      flex-direction: column;

      > :is(header, footer) {
        flex-shrink: 0;
        padding: var(--space-3);
      }

      > footer {
        margin-block-start: auto;
      }

      > nav {
        flex: 1;
        min-height: 0;
        overflow-y: auto;
        padding: var(--space-3) var(--space-2);
        font-size: var(--text-7);

        ul {
          list-style: none;
          padding: 0;
          margin: 0;
          display: flex;
          flex-direction: column;
          gap: var(--space-1);

          li {
            margin: 0;
          }
        }

        a {
          display: flex;
          gap: var(--space-2);
          padding: var(--space-1) var(--space-3);
          color: var(--foreground);
          text-decoration: none;
          border-radius: var(--radius-small);
          transition: background-color var(--transition-fast);

          &:is(:hover, [aria-current]) {
            background-color: var(--accent);
          }
        }

        details {
          border: none;
          overflow: visible;

          & + details { margin-top: 0; }
          &[open] summary { border-bottom: none; }
          > ul { margin-inline-start: var(--space-4); padding: var(--space-1) 0; }
        }

        summary {
          justify-content: flex-start;
          padding: var(--space-2) var(--space-3);
          border-radius: var(--radius-small);

          &::after {
            width: 0.75rem;
            height: 0.75rem;
            margin-inline-start: auto;
          }
        }
      }
    }

    > nav[data-topnav] {
      grid-column: 1 / -1;
    }
  }

  nav[data-topnav] {
    position: sticky;
    top: 0;
    z-index: 5;
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-2) var(--space-4);
    background-color: var(--background);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-small);
    
    a {
      text-decoration: none;
    }
  }

  :is([data-sidebar-toggle], [data-sidebar-header]) {
    display: none;
  }

  [data-sidebar-toggle] {
    padding: 0 var(--space-1);
    background: none;
    border: 1px solid var(--border);
    border-radius: var(--radius-small);
  }

  @media (min-width: 769px) {
    [data-sidebar-layout="always"] {
      transition: grid-template-columns var(--transition);

      [data-sidebar-toggle] {
        display: inline-block;
      }

      > aside[data-sidebar] {
        transform: translateX(0);
        opacity: 1;
        transition: transform var(--transition), opacity var(--transition), visibility var(--transition);
      }

      &[data-sidebar-open] {
        grid-template-columns: 0px 1fr;
        gap: 0;

        > aside[data-sidebar] {
          overflow: hidden;
          min-width: 0;
          transform: translateX(-100%);
          opacity: 0;
          visibility: hidden;
          border-inline-end: none;
        }
      }
    }
  }

  @media (max-width: 768px) {
    [data-sidebar-layout] {
      grid-template-columns: 1fr;

      > main {
        grid-column: 1;
      }

      > aside[data-sidebar] {
        grid-column: 1;
        z-index: 2;
        width: 16rem;
        transform: translateX(-100%);
        transition: transform var(--transition);
        box-shadow: var(--shadow-large);
      }

      &[data-sidebar-open] > aside[data-sidebar] {
        transform: translateX(0);
      }
    }
    [data-sidebar-toggle] { display: inline-block; }

    [data-sidebar-header] {
      display: flex;
      align-items: center;
      gap: var(--space-3);
      padding: var(--space-3) var(--space-4);
      border-bottom: 1px solid var(--border);
    }
  }
}