/**
 * ZB Lite — Base identity partial (tokens, the 4 spine contexts, semantic elements
 * used across multiple page types). Loaded on every core page type.
 * See docs/superpowers/specs/2026-08-24-zb-lite-dedicated-architecture-design.md §4.
 *
 * @package ZeroBloat
 */

/* ---- Local token layer: honors dna.json tokens, safe slate fallbacks ---- */
.zb-core {
  --zbl-spine:       var(--zb-color-primary, #334155);
  --zbl-spine-dark:  var(--zb-color-primary-dark, #1e293b);
  --zbl-ink:         var(--zb-color-text, #0f172a);
  --zbl-muted:       var(--zb-color-text-muted, #64748b);
  --zbl-faint:       #94a3b8;
  --zbl-line:        var(--zb-color-border, #e2e8f0);
  --zbl-line-2:      #cbd5e1;
  --zbl-surface:     var(--zb-color-surface, #ffffff);
  --zbl-surface-alt: var(--zb-color-surface-alt, #f8fafc);
  --zbl-accent-ink:  #ffffff;
  --zbl-mono:        var(--zb-font-mono, ui-monospace, "SFMono-Regular", "SF Mono", Menlo, Consolas, monospace);
  --zbl-spine-w:     var(--zb-section-accent-width, 4px);
}

/* ============================================================
   THE SIGNATURE — 4px slate spine (section titles, archive titles,
   related-posts title share one rule since base loads everywhere)
   ============================================================ */
.zb-core .zb-section__title,
.zb-core .zb-recommended-posts__title,
.zb-core .zb-archive-header__title {
  position: relative;
  padding-left: 16px;
  color: var(--zbl-ink);
  font-weight: 700;
  line-height: var(--zb-font-lh-heading, 1.2);
}
.zb-core .zb-section__title::before,
.zb-core .zb-recommended-posts__title::before,
.zb-core .zb-archive-header__title::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.12em;
  bottom: 0.12em;
  width: var(--zbl-spine-w);
  border-radius: 2px;
  background: var(--zbl-spine);
}

/* Active navigation link — spine as an underline bar */
.zb-core .zbm-nav .current-menu-item > a,
.zb-core .zbm-nav .current_page_item > a {
  color: var(--zbl-ink);
  position: relative;
}
.zb-core .zbm-nav .current-menu-item > a::after,
.zb-core .zbm-nav .current_page_item > a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -6px;
  height: 3px;
  border-radius: 2px;
  background: var(--zbl-spine);
}

/* ============================================================
   SEMANTIC ELEMENTS used in 2+ page types — social links, search
   form, numbered pager. TOC stays in content.css (article-only).
   ============================================================ */
.zb-core .wp-block-social-links { gap: 10px; }
.zb-core .wp-block-social-links .wp-social-link,
.zb-core .wp-block-social-links .wp-social-link a {
  background: var(--zbl-surface);
  color: var(--zbl-spine);
}
.zb-core .wp-block-social-links .wp-social-link {
  width: 40px;
  height: 40px;
  border: 1px solid var(--zbl-line-2);
  border-radius: 9px;
  transition: background .15s, color .15s, border-color .15s;
}
.zb-core .wp-block-social-links .wp-social-link:hover {
  background: var(--zbl-spine);
  border-color: var(--zbl-spine);
  color: var(--zbl-accent-ink);
}

.zb-core .wp-block-search__input,
.zb-core .search-field {
  font-family: var(--zb-font-body, system-ui, sans-serif);
  font-size: 14px;
  color: var(--zbl-ink);
  background: var(--zbl-surface);
  border: 1px solid var(--zbl-line-2);
  border-radius: 8px;
  padding: 11px 13px;
}
.zb-core .wp-block-search__input::placeholder,
.zb-core .search-field::placeholder { color: var(--zbl-faint); }
.zb-core .wp-block-search__input:focus,
.zb-core .search-field:focus {
  outline: none;
  border-color: var(--zbl-spine);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--zbl-spine) 20%, transparent);
}
.zb-core .wp-block-search__button,
.zb-core .search-submit {
  font-weight: 600;
  font-size: 13px;
  color: var(--zbl-accent-ink);
  background: var(--zbl-spine);
  border: 0;
  border-radius: 8px;
  padding: 0 20px;
  cursor: pointer;
}
.zb-core .wp-block-search__button:hover,
.zb-core .search-submit:hover { background: var(--zbl-spine-dark); }

.zb-core .nav-links,
.zb-core .wp-block-query-pagination { display: flex; gap: 6px; align-items: center; flex-wrap: wrap; }
.zb-core .page-numbers {
  font-family: var(--zbl-mono);
  font-size: 13px;
  min-width: 36px;
  height: 36px;
  padding: 0 9px;
  display: grid;
  place-items: center;
  border: 1px solid var(--zbl-line-2);
  border-radius: 8px;
  color: var(--zbl-muted);
  text-decoration: none;
  font-variant-numeric: tabular-nums;
}
.zb-core a.page-numbers:hover { border-color: var(--zbl-spine); color: var(--zbl-spine); }
.zb-core .page-numbers.current {
  background: var(--zbl-spine);
  border-color: var(--zbl-spine);
  color: var(--zbl-accent-ink);
  font-weight: 600;
}
.zb-core .page-numbers.dots { border: 0; color: var(--zbl-faint); min-width: auto; padding: 0 2px; }

/* ============================================================
   HEADER — headers/header-lite (dedicated, not shared)
   ============================================================ */
.zb-core .zb-header-lite { background: var(--zbl-surface); border-bottom: 1px solid var(--zbl-line); }
.zb-core .zb-header-lite--sticky { position: sticky; top: 0; z-index: 40; }
.zb-core .zb-header-lite__inner { display: flex; align-items: center; justify-content: space-between; gap: 24px; padding-block: 16px; }
.zb-core .zb-header-lite__brand { display: flex; align-items: center; text-decoration: none; }
.zb-core .zb-header-lite__brand-name { font-size: 1.15rem; font-weight: 700; color: var(--zbl-ink); }
.zb-core .zb-header-lite__nav { flex: 1; display: flex; justify-content: center; }
.zb-core .zb-header-lite__menu { display: flex; gap: 28px; list-style: none; margin: 0; padding: 0; }
.zb-core .zb-header-lite__menu a { position: relative; color: var(--zbl-muted); text-decoration: none; font-size: 0.95rem; font-weight: 500; padding-bottom: 3px; }
.zb-core .zb-header-lite__menu a:hover { color: var(--zbl-ink); }
.zb-core .zb-header-lite__menu .current-menu-item > a,
.zb-core .zb-header-lite__menu .current_page_item > a { color: var(--zbl-ink); }
.zb-core .zb-header-lite__menu .current-menu-item > a::after,
.zb-core .zb-header-lite__menu .current_page_item > a::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -1px; height: 2px; background: var(--zbl-spine);
}
.zb-core .zb-header-lite__actions { display: flex; align-items: center; gap: 8px; }
.zb-core .zb-header-lite__search-toggle,
.zb-core .zb-header-lite__hamburger {
  display: inline-flex; align-items: center; justify-content: center;
  width: 38px; height: 38px; border: 1px solid var(--zbl-line-2); border-radius: 8px;
  background: var(--zbl-surface); color: var(--zbl-muted); cursor: pointer;
}
.zb-core .zb-header-lite__search-toggle:hover,
.zb-core .zb-header-lite__hamburger:hover { border-color: var(--zbl-spine); color: var(--zbl-spine); }
.zb-core .zb-header-lite__hamburger { display: none; flex-direction: column; gap: 4px; }
.zb-core .zb-header-lite__hamburger span { width: 16px; height: 2px; background: currentColor; border-radius: 2px; }
.zb-core .zb-header-lite__search-panel { border-top: 1px solid var(--zbl-line); background: var(--zbl-surface-alt); padding: 14px clamp(16px,3vw,40px); }
.zb-core .zb-header-lite__search-form { display: flex; gap: 8px; max-width: 480px; margin: 0 auto; }
.zb-core .zb-header-lite__drawer {
  position: fixed; top: 0; right: 0; bottom: 0; width: min(320px, 85vw);
  background: var(--zbl-surface); border-left: 1px solid var(--zbl-line);
  padding: 20px; z-index: 60; overflow-y: auto;
}
.zb-core .zb-header-lite__drawer-close {
  display: inline-flex; align-items: center; justify-content: center;
  width: 34px; height: 34px; border: 1px solid var(--zbl-line-2); border-radius: 8px;
  background: none; color: var(--zbl-muted); cursor: pointer; margin-bottom: 20px;
}
.zb-core .zb-header-lite__drawer-menu { list-style: none; margin: 0; padding: 0; display: grid; gap: 4px; }
.zb-core .zb-header-lite__drawer-menu a { display: block; padding: 10px 8px; color: var(--zbl-ink); text-decoration: none; border-radius: 6px; }
.zb-core .zb-header-lite__drawer-menu a:hover { background: var(--zbl-surface-alt); }
.zb-core .zb-header-lite__overlay { position: fixed; inset: 0; background: rgba(15,23,42,.4); z-index: 50; }
@media (max-width: 860px) {
  .zb-core .zb-header-lite__nav { display: none; }
  .zb-core .zb-header-lite__hamburger { display: inline-flex; }
}

/* ============================================================
   FOOTER — footers/footer-lite (dedicated, not shared)
   ============================================================ */
.zb-core .zb-footer-lite { border-top: 1px solid var(--zbl-line); padding-block: 32px; margin-top: 64px; }
.zb-core .zb-footer-lite__inner { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 16px; }
.zb-core .zb-footer-lite__brand { font-weight: 700; color: var(--zbl-ink); text-decoration: none; }
.zb-core .zb-footer-lite__menu { display: flex; gap: 20px; list-style: none; margin: 0; padding: 0; }
.zb-core .zb-footer-lite__menu a { color: var(--zbl-muted); text-decoration: none; font-size: 0.9rem; }
.zb-core .zb-footer-lite__menu a:hover { color: var(--zbl-spine); }
.zb-core .zb-footer-lite__copyright { margin: 0; font-family: var(--zbl-mono); font-size: 12px; color: var(--zbl-faint); }
@media (max-width: 640px) { .zb-core .zb-footer-lite__inner { flex-direction: column; align-items: flex-start; } }