@layer layout {
  aside.sidebar {
    position: sticky;
    top: 0;
    left: 0;
    width: var(--sidebar-width);
    height: 100vh;
    height: 100dvh;
    display: flex;
    flex-direction: column;
    padding: var(--space-5) var(--space-4);
    background-color: var(--color-background);
    border-right: 1px solid var(--color-border);
    z-index: 100;

    /* Mobile: off-canvas, and hidden (not focusable) while closed */
    @media (max-width: 767px) {
      position: fixed;
      transform: translateX(-100%);
      visibility: hidden;
      transition: transform var(--transition-slow), visibility 0s linear 300ms;

      &.is-open {
        transform: translateX(0);
        visibility: visible;
        box-shadow: var(--shadow-xl);
        transition: transform var(--transition-slow), visibility 0s;
      }
    }

    .sidebar__header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: var(--space-6);
      padding: 0 var(--space-3);
    }

    .sidebar__close {
      display: none;
      align-items: center;
      justify-content: center;
      width: 2.75rem;
      height: 2.75rem;
      padding: 0;
      color: var(--color-text-muted);
      background: transparent;
      border: none;
      border-radius: var(--radius-md);
      cursor: pointer;

      &:hover {
        color: var(--color-text);
        background: var(--color-gray-100);
      }

      svg {
        width: 1.5rem;
        height: 1.5rem;
      }

      @media (max-width: 767px) {
        display: flex;
      }
    }

    .sidebar__nav ul {
      display: flex;
      flex-direction: column;
      gap: var(--space-1);
      margin: 0;
      padding: 0;

      li {
        margin: 0;
        list-style-type: none;
      }
    }

    .sidebar__nav-item {
      display: flex;
      align-items: center;
      gap: var(--space-3);
      min-height: 2.75rem;
      padding: 0 var(--space-3);
      font-size: var(--text-base);
      font-weight: var(--font-medium);
      color: var(--color-text-muted);
      text-decoration: none;
      border-radius: var(--radius-md);

      svg {
        flex-shrink: 0;
        width: 1.25rem;
        height: 1.25rem;
      }

      svg path {
        stroke: currentColor;
      }

      &:hover {
        color: var(--color-text);
        background: var(--color-gray-100);
      }

      /* Active item: ink and weight only, no tinted block */
      &.is-active {
        font-weight: var(--font-bold);
        color: var(--color-text);
      }

      &:focus-visible {
        outline: 3px solid var(--color-focus);
        outline-offset: 2px;
      }
    }

    .sidebar__footer {
      margin-top: auto;
      padding-top: var(--space-4);
      border-top: 1px solid var(--color-border);

      .sidebar__plan {
        margin: 0 0 var(--space-3);
        padding: 0 var(--space-3);
        font-size: var(--text-sm);
        color: var(--color-text-muted);

        a {
          font-weight: var(--font-semibold);
          color: var(--color-text);
          text-decoration: underline;
          text-underline-offset: 0.2em;
        }
      }

      .sidebar__account-btn {
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: var(--space-2);
        width: 100%;
        min-height: 3rem;
        padding: var(--space-2) var(--space-3);
        color: var(--color-text);
        text-align: left;
        background: transparent;
        border: 0;
        border-radius: var(--radius-md);
        cursor: pointer;

        svg path {
          stroke: var(--color-text-muted);
        }

        &:hover {
          background: var(--color-gray-100);
        }

        &:focus-visible {
          outline: 3px solid var(--color-focus);
          outline-offset: 2px;
        }
      }

      .sidebar__account-info {
        display: flex;
        flex-direction: column;
        min-width: 0;
      }

      .sidebar__account-name {
        font-weight: var(--font-semibold);
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
      }

      .sidebar__account-email {
        font-size: var(--text-sm);
        color: var(--color-text-muted);
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
      }

      .dropdown__menu {
        width: 100%;
      }
    }
  }

  [data-theme="dark"] {
    aside.sidebar {
      .sidebar__nav-item:hover,
      .sidebar__nav-item.is-active,
      .sidebar__footer .sidebar__account-btn:hover {
        background: var(--color-hover);
      }
    }
  }
}