/* =============================================================
 * Utilities Bunker V4 — Knowledge Base
 * Reuses the global design tokens (:root in critical.css).
 * ============================================================= */

/* ── Landing hero ─────────────────────────────────────────── */
.kb-hero { text-align: center; padding: 32px 0 8px; }
.kb-hero__title { font-size: clamp(1.9rem, 4vw, 2.6rem); font-weight: 700; margin: 0 0 8px; color: var(--text-primary); }
.kb-hero__sub { color: var(--text-secondary); max-width: 620px; margin: 0 auto 22px; line-height: 1.6; }

.kb-search { position: relative; max-width: 560px; margin: 0 auto; }
.kb-search__icon { position: absolute; left: 16px; top: 50%; transform: translateY(-50%); color: var(--text-tertiary); pointer-events: none; }
.kb-search__input {
    width: 100%; box-sizing: border-box; padding: 14px 16px 14px 46px;
    background: var(--bg-input); border: 1px solid var(--border); border-radius: var(--radius-lg);
    color: var(--text-primary); font-size: 1rem; font-family: var(--font-body); transition: border-color var(--transition);
}
.kb-search__input:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-muted); }

/* ── Sections ─────────────────────────────────────────────── */
.kb-section { margin-top: 40px; }
.kb-section__title { font-size: 1.3rem; font-weight: 600; margin: 0 0 16px; color: var(--text-primary); }

/* ── Article cards ────────────────────────────────────────── */
.kb-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 16px; }
.kb-card {
    display: flex; flex-direction: column; gap: 8px; padding: 18px;
    background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-md);
    text-decoration: none; transition: background var(--transition), border-color var(--transition), transform var(--transition);
}
.kb-card:hover { background: var(--bg-card-hover); border-color: var(--accent-border); transform: translateY(-2px); }
.kb-card__cat { font-size: .72rem; font-weight: 600; letter-spacing: .04em; text-transform: uppercase; color: var(--accent); }
.kb-card__title { font-size: 1.05rem; font-weight: 600; color: var(--text-primary); line-height: 1.35; }
.kb-card__excerpt { font-size: .9rem; color: var(--text-secondary); line-height: 1.5; }
.kb-card__foot { display: flex; gap: 12px; font-size: .78rem; color: var(--text-tertiary); margin-top: auto; padding-top: 4px; }

/* ── Category cards ───────────────────────────────────────── */
.kb-cat-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 14px; }
.kb-cat-card {
    display: flex; align-items: center; gap: 14px; padding: 16px 18px;
    background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-md);
    text-decoration: none; transition: background var(--transition), border-color var(--transition);
}
.kb-cat-card:hover { background: var(--bg-card-hover); border-color: var(--accent-border); }
.kb-cat-card__icon { display: inline-flex; color: var(--accent); flex: 0 0 auto; }
.kb-cat-card__body { display: flex; flex-direction: column; gap: 2px; }
.kb-cat-card__name { font-weight: 600; color: var(--text-primary); }
.kb-cat-card__count { font-size: .8rem; color: var(--text-tertiary); }

.kb-empty { color: var(--text-secondary); padding: 8px 0; }

/* ── Article page layout ──────────────────────────────────── */
.kb-article__header { margin-bottom: 22px; }
.kb-article__cat { font-size: .75rem; font-weight: 600; letter-spacing: .04em; text-transform: uppercase; color: var(--accent); }
.kb-article__title { font-size: clamp(1.7rem, 3.5vw, 2.3rem); font-weight: 700; margin: 6px 0 10px; color: var(--text-primary); line-height: 1.2; }
.kb-article__lede { font-size: 1.1rem; color: var(--text-secondary); line-height: 1.6; max-width: 70ch; margin: 0 0 12px; }
.kb-article__meta { display: flex; gap: 16px; font-size: .85rem; color: var(--text-tertiary); }

.kb-article__grid { display: grid; grid-template-columns: minmax(0, 1fr) 280px; gap: 36px; align-items: start; }
.kb-article__side-inner { position: sticky; top: calc(var(--header-height) + 16px); display: flex; flex-direction: column; gap: 20px; }

/* ── Prose ────────────────────────────────────────────────── */
.kb-prose { color: var(--text-secondary); line-height: 1.7; font-size: 1rem; max-width: 75ch; }
.kb-prose h2 { font-size: 1.45rem; font-weight: 700; color: var(--text-primary); margin: 34px 0 12px; scroll-margin-top: calc(var(--header-height) + 16px); }
.kb-prose h3 { font-size: 1.15rem; font-weight: 600; color: var(--text-primary); margin: 24px 0 8px; }
.kb-prose p { margin: 0 0 14px; }
.kb-prose ul, .kb-prose ol { margin: 0 0 16px; padding-left: 22px; }
.kb-prose li { margin: 6px 0; }
.kb-prose a { color: var(--accent); text-decoration: none; border-bottom: 1px solid var(--accent-border); }
.kb-prose a:hover { color: var(--accent-hover); }
.kb-prose strong { color: var(--text-primary); }
.kb-prose code { font-family: var(--font-mono); font-size: .9em; background: var(--bg-secondary); border: 1px solid var(--border-subtle); border-radius: var(--radius-sm); padding: 1px 6px; color: var(--text-primary); }
.kb-prose pre { background: var(--bg-secondary); border: 1px solid var(--border); border-radius: var(--radius-md); padding: 14px 16px; overflow-x: auto; margin: 0 0 16px; }
.kb-prose pre code { background: none; border: none; padding: 0; }

.kb-prose .kb-table-wrap { overflow-x: auto; margin: 0 0 18px; border: 1px solid var(--border); border-radius: var(--radius-md); }
.kb-prose .kb-table-wrap table { margin: 0; border: none; }
.kb-prose table { width: 100%; border-collapse: collapse; margin: 0 0 18px; font-size: .92rem; }
.kb-prose th, .kb-prose td { text-align: left; padding: 9px 12px; border-bottom: 1px solid var(--border); }
.kb-prose th { color: var(--text-primary); font-weight: 600; background: var(--bg-secondary); }
.kb-prose tr:last-child td { border-bottom: none; }

.kb-callout { display: flex; gap: 12px; padding: 14px 16px; margin: 0 0 18px; background: var(--accent-muted); border: 1px solid var(--accent-border); border-radius: var(--radius-md); color: var(--text-primary); }
.kb-callout strong { color: var(--accent-hover); }
.kb-formula { font-family: var(--font-mono); font-size: 1.05rem; text-align: center; background: var(--bg-secondary); border: 1px solid var(--border); border-radius: var(--radius-md); padding: 16px; margin: 0 0 18px; color: var(--text-primary); }

/* ── TOC / CTA / related (sidebar) ────────────────────────── */
.kb-toc, .kb-cta, .kb-related { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-md); padding: 16px; }
.kb-toc__title, .kb-related__title { font-size: .8rem; font-weight: 600; letter-spacing: .04em; text-transform: uppercase; color: var(--text-tertiary); margin: 0 0 10px; }
.kb-toc__list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 7px; }
.kb-toc__list a { color: var(--text-secondary); text-decoration: none; font-size: .9rem; line-height: 1.4; border-left: 2px solid transparent; padding-left: 10px; display: block; }
.kb-toc__list a:hover { color: var(--accent); border-left-color: var(--accent); }

.kb-cta__label { display: block; font-size: .8rem; font-weight: 600; letter-spacing: .04em; text-transform: uppercase; color: var(--text-tertiary); margin-bottom: 10px; }
.kb-cta__btn {
    display: flex; align-items: center; justify-content: space-between; gap: 8px; margin-bottom: 8px;
    padding: 11px 14px; background: var(--accent); color: var(--text-inverse); font-weight: 600;
    text-decoration: none; border-radius: var(--radius-sm); transition: background var(--transition);
}
.kb-cta__btn:last-child { margin-bottom: 0; }
.kb-cta__btn:hover { background: var(--accent-hover); }

.kb-related__item { display: block; color: var(--text-secondary); text-decoration: none; font-size: .9rem; padding: 7px 0; border-bottom: 1px solid var(--border-subtle); line-height: 1.4; }
.kb-related__item:last-child { border-bottom: none; }
.kb-related__item:hover { color: var(--accent); }

.kb-article__browse { display: inline-block; font-size: .88rem; color: var(--accent); text-decoration: none; }
.kb-article__browse:hover { color: var(--accent-hover); }

/* ── FAQ + helpful ────────────────────────────────────────── */
.kb-faq { margin-top: 36px; }
.kb-faq h2 { font-size: 1.45rem; font-weight: 700; color: var(--text-primary); margin: 0 0 12px; }
.kb-faq__item { border: 1px solid var(--border); border-radius: var(--radius-md); margin-bottom: 10px; background: var(--bg-card); }
.kb-faq__item summary { cursor: pointer; padding: 13px 16px; font-weight: 600; color: var(--text-primary); list-style: none; }
.kb-faq__item summary::-webkit-details-marker { display: none; }
.kb-faq__item[open] summary { border-bottom: 1px solid var(--border); }
.kb-faq__item p { margin: 0; padding: 13px 16px; color: var(--text-secondary); line-height: 1.6; }

.kb-helpful { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; margin-top: 36px; padding: 16px 18px; background: var(--bg-secondary); border: 1px solid var(--border); border-radius: var(--radius-md); }
.kb-helpful__q { font-weight: 600; color: var(--text-primary); }
.kb-helpful__btns { display: flex; gap: 8px; }
.kb-helpful__btn { padding: 7px 14px; background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-sm); color: var(--text-primary); cursor: pointer; font-family: var(--font-body); transition: background var(--transition), border-color var(--transition); }
.kb-helpful__btn:hover { background: var(--bg-card-hover); border-color: var(--accent-border); }
.kb-helpful.is-voted .kb-helpful__btn { pointer-events: none; opacity: .6; }

/* ── Category header ──────────────────────────────────────── */
.kb-cat-header { display: flex; align-items: center; gap: 16px; margin-bottom: 24px; }
.kb-cat-header__icon { display: inline-flex; color: var(--accent); }
.kb-cat-header__icon svg { width: 32px; height: 32px; }
.kb-cat-header__title { font-size: 1.8rem; font-weight: 700; color: var(--text-primary); margin: 0 0 4px; }
.kb-cat-header__sub { color: var(--text-tertiary); margin: 0; font-size: .92rem; }
.kb-cat-header__sub a { color: var(--accent); text-decoration: none; }

/* ── Tool-page "learn how this works" link ────────────────── */
.kb-learn-link {
    display: inline-flex; align-items: center; gap: 7px; margin-top: 10px;
    font-size: .9rem; font-weight: 600; color: var(--accent); text-decoration: none;
    padding: 6px 12px; border: 1px solid var(--accent-border); border-radius: var(--radius-sm); background: var(--accent-muted);
}
.kb-learn-link:hover { background: var(--accent-border); color: var(--accent-hover); }

/* ── Responsive ───────────────────────────────────────────── */
@media (max-width: 880px) {
    .kb-article__grid { grid-template-columns: 1fr; }
    .kb-article__side-inner { position: static; }
}