.page-faq {
  --kb-rail: 210px;
  --kb-gap: clamp(1.5rem, 4vw, 3.25rem);
  color: var(--text-primary);
  background: var(--ink-900);
}

.page-faq .breadcrumb {
  padding-top: clamp(1.25rem, 3vw, 2rem);
}

/* ---------- hero ---------- */
.page-faq .kb-hero {
  position: relative;
  padding-block: clamp(1.75rem, 5vw, 3.5rem) clamp(2rem, 5vw, 3.5rem);
  border-bottom: 1px solid var(--grid-500);
}

.page-faq .kb-hero::before {
  content: "";
  position: absolute;
  inset-inline: 0;
  top: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--lime), transparent 55%);
}

.page-faq .kb-hero-kicker {
  color: var(--text-muted);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  margin: 0 0 1rem;
}

.page-faq .kb-hero h1 {
  font-family: var(--font-heading);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.14;
  font-size: clamp(1.85rem, 6vw, 3.5rem);
  max-width: 20ch;
  margin: 0 0 1.25rem;
}

.page-faq .kb-hero h1::after {
  content: "";
  display: block;
  width: 84px;
  height: 6px;
  margin-top: 1rem;
  background: var(--lime);
}

.page-faq .kb-hero-lead {
  max-width: 62ch;
  font-size: clamp(1rem, 1.6vw, 1.075rem);
  line-height: 1.62;
  color: var(--text-primary);
  margin: 0 0 1.75rem;
}

.page-faq .kb-hero-facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--grid-500);
  border: 1px solid var(--grid-500);
}

.page-faq .kb-hero-facts li {
  background: var(--ink-800);
  padding: 0.9rem 1.1rem;
  font-size: 0.9375rem;
  color: var(--text-primary);
  display: flex;
  gap: 0.7rem;
  align-items: baseline;
}

.page-faq .kb-hero-facts .mono {
  color: var(--lime);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
}

/* ---------- layout ---------- */
.page-faq .kb-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--kb-gap);
  padding-block: clamp(2rem, 5vw, 4rem) clamp(3rem, 6vw, 5rem);
}

.page-faq .kb-body {
  min-width: 0;
}

/* ---------- index column ---------- */
.page-faq .kb-index {
  border: 1px solid var(--grid-500);
  background: var(--ink-800);
  padding: 1rem 1.1rem 1.15rem;
  align-self: start;
}

.page-faq .kb-index-title {
  margin: 0 0 0.85rem;
  color: var(--text-muted);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  border-bottom: 1px solid var(--grid-500);
  padding-bottom: 0.7rem;
}

.page-faq .kb-index-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
}

.page-faq .kb-index-list a {
  display: flex;
  gap: 0.7rem;
  align-items: baseline;
  padding: 0.55rem 0.5rem;
  color: var(--text-primary);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: background var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
}

.page-faq .kb-index-list a .mono {
  color: var(--lime);
  font-size: 0.7rem;
}

.page-faq .kb-index-list a:hover,
.page-faq .kb-index-list a:focus-visible {
  background: var(--ink-700);
  border-left-color: var(--lime);
}

.page-faq .kb-index-list a:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 2px;
}

.page-faq .kb-index-note {
  margin: 1rem 0 0;
  padding-top: 0.8rem;
  border-top: 1px solid var(--grid-500);
  color: var(--text-muted);
  font-size: 0.7rem;
}

/* ---------- sections ---------- */
.page-faq .kb-section {
  padding-block: clamp(1.75rem, 4vw, 3rem);
  border-bottom: 1px solid var(--grid-500);
  min-width: 0;
}

.page-faq .kb-section:last-child {
  border-bottom: none;
}

.page-faq .kb-section h2 {
  font-family: var(--font-heading);
  font-weight: 800;
  letter-spacing: -0.015em;
  line-height: 1.2;
  font-size: clamp(1.35rem, 3.4vw, 2.1rem);
  margin: 0.5rem 0 1.1rem;
  scroll-margin-top: calc(var(--header-h) + 1.5rem);
}

.page-faq .kb-section h3 {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.0625rem;
  margin: 0 0 0.75rem;
  color: var(--text-primary);
}

.page-faq .kb-section p {
  font-size: 1rem;
  line-height: 1.62;
  margin: 0 0 1rem;
  max-width: 68ch;
}

.page-faq .kb-grid {
  gap: var(--kb-gap);
}

.page-faq .kb-col {
  min-width: 0;
}

.page-faq .kb-col--aside {
  display: grid;
  gap: 1rem;
  align-content: start;
}

.page-faq .section-mark {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin: 0;
}

.page-faq .section-mark .mono {
  color: var(--lime);
  font-weight: 700;
}

/* ---------- q01 ---------- */
.page-faq .num-inline {
  font-family: var(--font-display);
  font-size: 1.35em;
  color: var(--lime);
  letter-spacing: 0.02em;
  padding-inline: 0.1em;
}

.page-faq .kb-def {
  margin: 1.5rem 0 0;
  border-top: 1px solid var(--grid-500);
}

.page-faq .kb-def > div {
  display: grid;
  gap: 0.25rem;
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--grid-500);
}

.page-faq .kb-def dt {
  color: var(--lime);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
}

.page-faq .kb-def dd {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.55;
  color: var(--text-primary);
}

.page-faq .kb-figure {
  margin: 0;
}

.page-faq .kb-figure--bleed {
  margin-block: 1.25rem 2rem;
}

.page-faq .kb-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-faq .kb-anatomy {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 5vw, 2.25rem);
  font-weight: 700;
  letter-spacing: 0.02em;
  border: 1px solid var(--grid-500);
  background: var(--ink-800);
  padding: 0.85rem 1rem;
}

.page-faq .kb-seg {
  padding: 0.1em 0.35em;
  border: 1px solid var(--grid-600);
  color: var(--text-primary);
}

.page-faq .kb-seg--a {
  border-color: var(--replay-ice);
  color: var(--replay-ice);
}

.page-faq .kb-seg--b {
  border-color: var(--lime);
  color: var(--lime);
  background: rgba(200, 240, 60, 0.08);
}

.page-faq .kb-seg--c {
  border-color: var(--transfer-violet);
  color: var(--transfer-violet);
}

.page-faq .kb-seg-sep {
  color: var(--text-muted);
  font-size: 0.8em;
}

.page-faq .kb-tip {
  color: var(--text-muted);
  font-size: 0.75rem;
  line-height: 1.6;
  border-left: 2px solid var(--grid-600);
  padding-left: 0.8rem;
  margin: 1.25rem 0 0 !important;
  max-width: 60ch;
}

/* ---------- q02 field grid ---------- */
.page-faq .kb-fieldgrid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--grid-500);
  border: 1px solid var(--grid-500);
}

.page-faq .kb-fieldgroup {
  background: var(--ink-800);
  padding: 1.15rem 1.15rem 0.3rem;
}

.page-faq .kb-fieldgroup h3 {
  color: var(--lime);
  font-size: 0.8125rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding-bottom: 0.6rem;
  border-bottom: 1px solid var(--grid-500);
  font-family: var(--font-mono);
  font-weight: 400;
}

.page-faq .kb-fields {
  margin: 0;
}

.page-faq .kb-fields > div {
  padding: 0.7rem 0;
  border-bottom: 1px solid var(--grid-500);
  transition: background var(--t-fast) var(--ease);
}

.page-faq .kb-fields > div:last-child {
  border-bottom: none;
}

.page-faq .kb-fields > div:hover,
.page-faq .kb-fields > div:focus-within {
  background: var(--ink-700);
}

.page-faq .kb-fields dt {
  font-weight: 700;
  font-size: 0.9375rem;
  margin-bottom: 0.3rem;
  color: var(--text-primary);
}

.page-faq .kb-fields dd {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.55;
  color: var(--text-muted);
}

/* ---------- q03 / q06 accordion ---------- */
.page-faq .kb-qa {
  display: grid;
  gap: 1px;
  background: var(--grid-500);
  border: 1px solid var(--grid-500);
}

.page-faq .kb-item {
  background: var(--ink-800);
  transition: background var(--t-base) var(--ease);
}

.page-faq .kb-item[open] {
  background: var(--ink-700);
}

.page-faq .kb-item > summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  gap: 0.7rem;
  align-items: baseline;
  padding: 1rem 1.1rem;
  font-weight: 700;
  font-size: 0.9688rem;
  line-height: 1.45;
  color: var(--text-primary);
  position: relative;
  padding-right: 2.6rem;
}

.page-faq .kb-item > summary::-webkit-details-marker {
  display: none;
}

.page-faq .kb-item > summary::after {
  content: "";
  position: absolute;
  right: 1.1rem;
  top: 1.35rem;
  width: 9px;
  height: 9px;
  border-right: 2px solid var(--lime);
  border-bottom: 2px solid var(--lime);
  transform: rotate(45deg);
  transition: transform var(--t-slow) var(--ease);
}

.page-faq .kb-item[open] > summary::after {
  transform: rotate(225deg);
}

.page-faq .kb-item > summary:hover,
.page-faq .kb-item > summary:focus-visible {
  background: var(--ink-700);
}

.page-faq .kb-item > summary:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: -2px;
}

.page-faq .kb-item-body {
  padding: 0 1.1rem 1.15rem;
  border-top: 1px solid var(--grid-500);
  margin-top: 0;
}

.page-faq .kb-item-body p {
  margin: 1rem 0 0;
  font-size: 0.9375rem;
  line-height: 1.6;
  color: var(--text-muted);
  max-width: 62ch;
}

.page-faq .kb-item .tag {
  flex: none;
  margin-top: 2px;
}

/* ---------- q05 steps ---------- */
.page-faq .kb-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--grid-500);
  counter-reset: kbstep;
}

.page-faq .kb-steps li {
  display: flex;
  gap: 0.75rem;
  align-items: baseline;
  padding: 0.8rem 0;
  border-bottom: 1px solid var(--grid-500);
  font-size: 0.9375rem;
  line-height: 1.5;
}

.page-faq .kb-steps .mono {
  color: var(--text-muted);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  flex: none;
  width: 62px;
}

/* ---------- closing ---------- */
.page-faq .kb-section--closing {
  border-bottom: none;
}

.page-faq .kb-cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin: 0;
}

.page-faq .kb-cta-row .btn {
  text-decoration: none;
}

/* ---------- responsive ---------- */
@media (min-width: 700px) {
  .page-faq .kb-hero-facts {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-faq .kb-fieldgrid {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-faq .kb-def > div {
    grid-template-columns: 118px 1fr;
    align-items: baseline;
    gap: 1rem;
  }
}

@media (min-width: 1024px) {
  .page-faq .kb-layout {
    grid-template-columns: var(--kb-rail) minmax(0, 1fr);
    gap: clamp(2rem, 5vw, 4.5rem);
  }

  .page-faq .kb-index {
    position: sticky;
    top: calc(var(--header-h) + 1.5rem);
  }

  .page-faq .kb-fieldgrid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 1280px) {
  .page-faq .kb-hero h1 {
    font-size: 3.75rem;
  }
}