/* =========================================================
   UP2Digital — Tudástár (knowledge base) styles
   Extends styles.css tokens
   ========================================================= */

/* Header / hero */
.kb-hero {
  background: var(--up2-black);
  color: var(--on-dark);
  padding: 140px var(--pad-x) 64px;
  position: relative;
  overflow: hidden;
}
.kb-hero__grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(to right, rgba(255,255,255,0.04) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255,255,255,0.04) 1px, transparent 1px);
  background-size: 80px 80px;
  mask-image: radial-gradient(ellipse at 50% 0%, #000 20%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse at 50% 0%, #000 20%, transparent 70%);
  pointer-events: none;
}
.kb-hero__inner { max-width: var(--container); margin: 0 auto; position: relative; }
.kb-breadcrumb {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--on-dark-faint);
  margin-bottom: 32px;
}
.kb-breadcrumb a { color: var(--on-dark-faint); transition: color .2s; }
.kb-breadcrumb a:hover { color: var(--up2-yellow); }
.kb-breadcrumb .sep { opacity: .5; }
.kb-hero__eyebrow {
  display: inline-flex; align-items: center; gap: 12px;
  font-family: var(--font-mono); font-size: 12px;
  letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--up2-yellow); margin-bottom: 24px;
}
.kb-hero__eyebrow .bar { width: 32px; height: 2px; background: var(--up2-yellow); }
.kb-hero h1 {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(40px, 5.5vw, 76px);
  line-height: 0.98;
  letter-spacing: -0.035em;
  max-width: 16ch;
  text-wrap: balance;
  margin-bottom: 22px;
}
.kb-hero h1 .accent { color: var(--up2-yellow); }
.kb-hero__sub {
  font-size: clamp(16px, 1.3vw, 19px);
  line-height: 1.55;
  color: var(--on-dark-muted);
  max-width: 60ch;
  margin-bottom: 40px;
  text-wrap: pretty;
}

/* Search */
.kb-search {
  display: flex;
  align-items: center;
  gap: 14px;
  background: var(--dark-2);
  border: 1px solid var(--line-dark-2);
  border-radius: var(--r-pill);
  padding: 6px 6px 6px 22px;
  max-width: 560px;
  transition: border-color .2s;
}
.kb-search:focus-within { border-color: var(--up2-yellow); }
.kb-search svg { width: 18px; height: 18px; color: var(--on-dark-faint); flex-shrink: 0; }
.kb-search input {
  flex: 1;
  background: none;
  border: 0;
  color: var(--on-dark);
  font-family: var(--font-body);
  font-size: 16px;
  padding: 12px 0;
  outline: none;
}
.kb-search input::placeholder { color: var(--on-dark-faint); }
.kb-search button {
  background: var(--up2-yellow);
  color: var(--up2-black);
  border-radius: var(--r-pill);
  padding: 12px 20px;
  font-weight: 600;
  font-size: 14px;
  flex-shrink: 0;
}
.kb-search__hint {
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--on-dark-faint);
}

/* Category cards */
.kb-cats {
  padding: var(--section-y) var(--pad-x) 0;
  max-width: var(--container);
  margin: 0 auto;
}
.kb-cats__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--hairline);
  border: 1px solid var(--hairline);
  border-radius: var(--r-lg);
  overflow: hidden;
}
@media (max-width: 880px) { .kb-cats__grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 560px) { .kb-cats__grid { grid-template-columns: 1fr; } }
.kb-cat-card {
  background: var(--bg);
  padding: 28px 26px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  cursor: pointer;
  transition: background .2s;
  text-align: left;
}
.kb-cat-card:hover { background: var(--paper); }
.kb-cat-card.is-active { background: var(--up2-black); color: var(--on-dark); }
.kb-cat-card__top { display: flex; align-items: center; justify-content: space-between; }
.kb-cat-card__icon {
  width: 40px; height: 40px;
  display: grid; place-items: center;
  border-radius: 10px;
  background: var(--up2-yellow-soft);
  color: var(--up2-yellow-deep);
}
.kb-cat-card.is-active .kb-cat-card__icon { background: rgba(245,197,24,0.16); color: var(--up2-yellow); }
.kb-cat-card__icon svg { width: 20px; height: 20px; }
.kb-cat-card__count {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--ink-faint);
}
.kb-cat-card.is-active .kb-cat-card__count { color: var(--on-dark-faint); }
.kb-cat-card h3 {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 20px;
  letter-spacing: -0.02em;
}
.kb-cat-card p { font-size: 13px; color: var(--ink-muted); line-height: 1.5; }
.kb-cat-card.is-active p { color: var(--on-dark-muted); }

/* Filter chips (sticky) */
.kb-filters {
  position: sticky;
  top: 70px;
  z-index: 40;
  background: var(--bg);
  border-bottom: 1px solid var(--hairline);
  padding: 16px var(--pad-x);
  margin-top: var(--section-y);
}
.kb-filters__inner {
  max-width: var(--container);
  margin: 0 auto;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items: center;
}
.kb-chip {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  padding: 9px 16px;
  border: 1px solid var(--hairline);
  border-radius: var(--r-pill);
  background: var(--paper);
  color: var(--ink-muted);
  transition: all .2s;
  white-space: nowrap;
}
.kb-chip:hover { border-color: var(--ink); color: var(--ink); }
.kb-chip.is-active { background: var(--up2-black); color: var(--on-dark); border-color: var(--up2-black); }
.kb-chip .c { color: var(--up2-yellow-deep); }
.kb-chip.is-active .c { color: var(--up2-yellow); }

/* FAQ list */
.kb-list {
  padding: var(--section-y) var(--pad-x);
  max-width: 900px;
  margin: 0 auto;
}
.kb-group { margin-bottom: 56px; }
.kb-group__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 8px;
  padding-bottom: 18px;
  border-bottom: 2px solid var(--up2-black);
}
.kb-group__head h2 {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(24px, 2.4vw, 32px);
  letter-spacing: -0.025em;
}
.kb-group__head .num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--up2-yellow-deep);
}
.kb-empty {
  text-align: center;
  padding: 60px 20px;
  color: var(--ink-muted);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  display: none;
}

.faq {
  border-bottom: 1px solid var(--hairline);
}
.faq__q {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 24px 4px;
  text-align: left;
  cursor: pointer;
}
.faq__q h3 {
  flex: 1;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: clamp(18px, 1.6vw, 22px);
  letter-spacing: -0.015em;
  line-height: 1.3;
  transition: color .2s;
}
.faq:hover .faq__q h3 { color: var(--up2-yellow-deep); }
.faq__toggle {
  width: 36px; height: 36px;
  border-radius: 50%;
  border: 1px solid var(--hairline);
  display: grid;
  place-items: center;
  flex-shrink: 0;
  transition: background .2s, border-color .2s, transform .3s;
  position: relative;
}
.faq__toggle::before, .faq__toggle::after {
  content: '';
  position: absolute;
  background: var(--ink);
  transition: transform .3s, background .2s;
}
.faq__toggle::before { width: 14px; height: 2px; }
.faq__toggle::after { width: 2px; height: 14px; }
.faq.is-open .faq__toggle { background: var(--up2-yellow); border-color: var(--up2-yellow); }
.faq.is-open .faq__toggle::after { transform: scaleY(0); }
.faq__body {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows .35s ease;
}
.faq.is-open .faq__body { grid-template-rows: 1fr; }
.faq__body-inner { overflow: hidden; }
.faq__answer {
  padding: 0 4px 28px;
  max-width: 68ch;
}
.faq__answer p {
  font-size: 16px;
  line-height: 1.65;
  color: var(--ink-2);
  margin-bottom: 14px;
  text-wrap: pretty;
}
.faq__answer ul {
  list-style: none;
  margin: 6px 0 18px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.faq__answer ul li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 15px;
  line-height: 1.55;
  color: var(--ink-2);
}
.faq__answer ul li::before { content: '↑'; color: var(--up2-yellow-deep); font-weight: 800; flex-shrink: 0; }
.faq__foot {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  padding-top: 18px;
  border-top: 1px solid var(--hairline);
  margin-top: 6px;
}
.faq__rel {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-muted);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.faq__rel a { color: var(--up2-yellow-deep); border-bottom: 1px solid currentColor; padding-bottom: 1px; }
.faq__cta {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--up2-black);
  color: var(--on-dark);
  padding: 10px 18px;
  border-radius: var(--r-pill);
  font-weight: 600;
  font-size: 13px;
  transition: transform .15s, background .2s;
}
.faq__cta:hover { background: var(--dark-3); transform: translateY(-1px); }
.faq__cta svg { width: 13px; height: 13px; }

/* Closing CTA band */
.kb-cta {
  background: var(--up2-yellow);
  color: var(--up2-black);
  padding: var(--section-y) var(--pad-x);
}
.kb-cta__inner {
  max-width: var(--container);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 48px;
  align-items: center;
}
@media (max-width: 880px) { .kb-cta__inner { grid-template-columns: 1fr; gap: 28px; } }
.kb-cta h2 {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(30px, 3.6vw, 52px);
  letter-spacing: -0.03em;
  line-height: 1;
  text-wrap: balance;
}
.kb-cta p { font-size: 16px; line-height: 1.6; margin-top: 16px; max-width: 46ch; }
.kb-cta__btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: var(--up2-black);
  color: var(--up2-yellow);
  padding: 18px 28px;
  border-radius: var(--r-pill);
  font-weight: 600;
  font-size: 16px;
  justify-self: end;
  transition: transform .15s;
}
.kb-cta__btn:hover { transform: translateY(-2px); }
@media (max-width: 880px) { .kb-cta__btn { justify-self: start; } }
.kb-cta__btn svg { width: 16px; height: 16px; }