/* ==========================================================================
   Kit sidebar — navigation for all kit pages (index.html, kit/*.html)
   Markup: partials/kit-sidebar.html      Behaviour: js/components/kit-sidebar.js
   ≥ 900px : sticky sidebar
   < 900px : floating "Kit index" button that opens the nav as a dialog
   ========================================================================== */

.kit-sidebar {
  position: sticky;
  top: 0;
  display: flex;
  flex-direction: column;
  gap: 20px;
  width: 100%;
  height: 100vh;
  overflow: auto;
  padding: 20px 14px 32px;
  border-right: 1px solid var(--line);
  background: var(--surface);
}

.kit-sidebar__head {
  display: contents;
}

/* Brand ------------------------------------------------------------------ */
.kit-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 4px 8px;
  color: var(--ink);
  text-decoration: none;
}

.kit-brand:hover {
  color: var(--ink);
}

.kit-brand__mark {
  display: grid;
  place-items: center;
  width: 28px;
  height: 28px;
  border-radius: 8px;
  background: var(--action);
}

/* Upward triangle: the Δ mark */
.kit-brand__mark::before {
  content: "";
  width: 0;
  height: 0;
  border-left: 7px solid transparent;
  border-right: 7px solid transparent;
  border-bottom: 12px solid var(--on-action);
}

.kit-brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.kit-brand__name {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: -.02em;
}

.kit-brand__meta {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-3);
}

/* Nav groups ------------------------------------------------------------- */
.kit-nav {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.kit-nav__title {
  padding: 0 8px 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--ink-3);
}

.kit-nav__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 6px 8px;
  border-radius: 8px;
  color: var(--ink-2);
  font-size: 14px;
  text-decoration: none;
}

.kit-nav__link:hover {
  background: var(--surface-2);
}

.kit-nav__link[aria-current="page"] {
  background: var(--surface-3);
  color: var(--ink);
  font-weight: 600;
}

.kit-nav__code {
  flex-shrink: 0;
  width: 24px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-3);
}

/* Mobile toggle + close (hidden on desktop) ------------------------------ */
.kit-sidebar__toggle,
.kit-sidebar__close,
.kit-sidebar__dialog-title {
  display: none;
}

@media (max-width: 899px) {
  .kit-sidebar__toggle {
    position: fixed;
    right: 16px;
    bottom: 16px;
    z-index: 70;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    min-height: 48px;
    padding: 0 18px;
    border: 0;
    border-radius: 999px;
    background: var(--inverse);
    color: var(--on-inverse);
    font-family: var(--font-mono);
    font-size: 13px;
    box-shadow: var(--shadow-pop);
  }

  .kit-sidebar__toggle-icon {
    color: var(--action);
  }

  /* Closed: the nav is not shown at all on small screens */
  .kit-sidebar {
    display: none;
  }

  /* Open: full-screen dialog */
  .kit-sidebar.is-open {
    position: fixed;
    inset: 0;
    z-index: 80;
    display: flex;
    gap: 18px;
    height: auto;
    padding: 16px 20px 32px;
    border-right: 0;
  }

  .kit-sidebar.is-open .kit-brand {
    display: none;
  }

  .kit-sidebar.is-open .kit-sidebar__head {
    display: flex;
    justify-content: space-between;
    align-items: center;
  }

  .kit-sidebar.is-open .kit-sidebar__dialog-title {
    display: block;
    font-family: var(--font-display);
    font-size: 22px;
  }

  .kit-sidebar.is-open .kit-sidebar__close {
    display: inline-flex;
    align-items: center;
    min-height: 44px;
    padding: 0 16px;
    border: 1px solid var(--line-2);
    border-radius: 999px;
    background: var(--surface);
    color: var(--ink);
    font-weight: 600;
  }

  .kit-sidebar.is-open .kit-nav {
    gap: 0;
  }

  .kit-sidebar.is-open .kit-nav__title {
    padding: 0 0 6px;
    letter-spacing: 0;
  }

  .kit-sidebar.is-open .kit-nav__link {
    align-items: center;
    gap: 12px;
    min-height: 44px;
    padding: 0;
    border-bottom: 1px solid var(--line);
    border-radius: 0;
    background: none;
    font-size: 16px;
  }

  .kit-sidebar.is-open .kit-nav__code {
    width: 30px;
    font-size: 12px;
  }
}