/* ==========================================================================
   Kit sidebar — markup in partials/kit-sidebar.html, behaviour in
   assets/js/components/kit-sidebar.js

   ≥ 960px  sticky 280px column with filter and footer links
   < 960px  sticky top bar; the navigation opens as a dropdown panel
   ========================================================================== */

/* Brand ring used next to the LUMEN wordmark */
.kit-logo-mark {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: 1.5px solid var(--graphite-900);
  box-shadow: inset 0 0 0 3px var(--graphite-50), inset 0 0 0 5.5px var(--scrub-600);
}

.kit-sidebar__bar { display: none; }

.kit-sidebar__panel {
  position: sticky;
  top: 0;
  width: 280px;
  height: 100vh;
  box-sizing: border-box;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 24px;
  padding: 28px 20px 24px;
  background: var(--graphite-50);
  border-right: 1px solid var(--color-hairline);
}
/* The panel scrolls; its children keep their size instead of being squeezed */
.kit-sidebar__panel > * { flex-shrink: 0; }

/* ── Brand ──────────────────────────────────────────────────────────────── */

.kit-sidebar__brand {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 8px;
  color: var(--graphite-900);
  text-decoration: none;
}
.kit-sidebar__brand:hover { color: var(--graphite-900); }

.kit-sidebar__brand-name {
  display: flex;
  align-items: center;
  gap: 10px;
}

.kit-sidebar__wordmark {
  font: 600 16px/1 'Geist', sans-serif;
  letter-spacing: .22em;
}

.kit-sidebar__version {
  font: 500 11px/1 'Geist Mono', monospace;
  color: var(--graphite-500);
  letter-spacing: .06em;
}

/* ── Filter ─────────────────────────────────────────────────────────────── */

.kit-sidebar__filter {
  display: flex;
  align-items: center;
  gap: 8px;
  height: 40px;
  padding: 0 12px;
  border: 1px solid var(--ink-a16);
  border-radius: var(--radius-m);
  background: var(--graphite-0);
}

.kit-sidebar__filter-icon {
  flex: none;
  width: 10px;
  height: 10px;
  border: 1.5px solid var(--graphite-500);
  border-radius: 50%;
}

.kit-sidebar__filter-input {
  flex: 1;
  min-width: 0;
  padding: 0;
  border: 0;
  outline: 0;
  background: transparent;
  font: 400 14px/1 'Geist', sans-serif;
  color: var(--graphite-900);
  -webkit-appearance: none;
  appearance: none;
}

/* ── Navigation ─────────────────────────────────────────────────────────── */

.kit-sidebar__nav {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.kit-sidebar__group {
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.kit-sidebar__group-label {
  padding: 4px 8px 8px;
  font: 500 11px/1 'Geist Mono', monospace;
  letter-spacing: .1em;
  color: var(--graphite-500);
}

.kit-sidebar__link {
  display: flex;
  gap: 10px;
  align-items: center;
  height: 34px;
  padding: 0 8px;
  border: 1px solid transparent;
  border-radius: var(--radius-m);
  background: transparent;
  color: var(--graphite-900);
  font: 400 14px/1 'Geist', sans-serif;
  text-decoration: none;
  transition: background var(--dur-2);
}
.kit-sidebar__link:hover {
  background: var(--graphite-0);
  color: var(--graphite-900);
}

.kit-sidebar__link[aria-current="page"] {
  border-color: var(--ink-a14);
  background: var(--graphite-0);
  font-weight: 500;
}
/* Current-page ring */
.kit-sidebar__link[aria-current="page"]::after {
  content: '';
  width: 8px;
  height: 8px;
  border-radius: 50%;
  border: 1.5px solid var(--scrub-600);
}

.kit-sidebar__code {
  width: 28px;
  font: 500 11px/1 'Geist Mono', monospace;
  color: var(--graphite-500);
}

.kit-sidebar__name {
  flex: 1;
  min-width: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ── Footer links ───────────────────────────────────────────────────────── */

.kit-sidebar__footer {
  margin-top: auto;
  padding: 14px 8px 0;
  border-top: 1px solid var(--ink-a10);
  display: flex;
  flex-direction: column;
  gap: 8px;
  font: 400 12px/1.45 'Geist Mono', monospace;
  color: var(--graphite-500);
}
.kit-sidebar__footer a { color: var(--scrub-600); }

/* ── Mobile (< 960px) ───────────────────────────────────────────────────── */

@media (max-width: 959.98px) {
  .kit-sidebar {
    position: sticky;
    top: 0;
    z-index: 20;
    width: 100vw;
    box-sizing: border-box;
    background: var(--graphite-50);
    border-bottom: 1px solid var(--color-hairline);
  }

  .kit-sidebar__bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 56px;
    padding: 0 16px;
  }

  .kit-sidebar__brand--bar {
    justify-content: flex-start;
    gap: 10px;
    padding: 0;
  }
  .kit-sidebar__brand--bar .kit-logo-mark {
    width: 16px;
    height: 16px;
    box-shadow: inset 0 0 0 3px var(--graphite-50), inset 0 0 0 5px var(--scrub-600);
  }
  .kit-sidebar__brand--bar .kit-sidebar__wordmark {
    font-size: 15px;
    letter-spacing: .2em;
  }

  .kit-sidebar__toggle {
    height: 44px;
    padding: 0 14px;
    border: 1px solid var(--ink-a20);
    border-radius: var(--radius-pill);
    background: var(--graphite-0);
    color: var(--graphite-900);
    font: 500 14px/1 'Geist', sans-serif;
    white-space: nowrap;
    cursor: pointer;
  }

  /* Panel becomes the dropdown: only the page list is shown */
  .kit-sidebar__panel {
    display: none;
    position: static;
    width: auto;
    height: auto;
    max-height: 70vh;
    padding: 8px 16px 20px;
    border-right: 0;
  }
  .kit-sidebar.is-open .kit-sidebar__panel { display: block; }

  .kit-sidebar__panel > .kit-sidebar__brand,
  .kit-sidebar__filter,
  .kit-sidebar__footer { display: none; }

  .kit-sidebar__nav { gap: 18px; }
  .kit-sidebar__group { gap: 2px; }
  .kit-sidebar__group-label { padding: 6px 0; }

  .kit-sidebar__link {
    gap: 12px;
    height: auto;
    min-height: 44px;
    padding: 0 10px;
    border: 0;
    font: 500 15px/1.2 'Geist', sans-serif;
  }
  .kit-sidebar__link[aria-current="page"] { background: var(--graphite-0); }
  .kit-sidebar__link[aria-current="page"]::after { content: none; }

  .kit-sidebar__code { width: 30px; font-size: 12px; }
  .kit-sidebar__name { white-space: normal; }
}