.page-faq {
  --faq-rail-w: 208px;
  --faq-accent-soft: rgba(199, 249, 74, 0.08);
  background:
    radial-gradient(120% 80% at 10% 0%, rgba(79, 209, 197, 0.07), transparent 62%),
    radial-gradient(90% 60% at 92% 12%, rgba(226, 69, 58, 0.06), transparent 66%);
  padding-bottom: var(--space-12);
  overflow-x: hidden;
}

/* ── 首屏 ───────────────────────────────────────── */
.page-faq .kb-hero {
  position: relative;
  padding: calc(var(--header-h) + var(--space-8)) 0 var(--space-8);
}

.page-faq .kb-hero .breadcrumb {
  margin-bottom: var(--space-4);
}

.page-faq .kb-hero h1 {
  font-size: var(--fs-h1);
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--mist);
  max-width: 22ch;
  margin: var(--space-2) 0 var(--space-3);
}

.page-faq .kb-hero .lede {
  max-width: 60ch;
  color: var(--stone);
}

.page-faq .kb-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4) var(--space-8);
  margin: var(--space-6) 0 0;
  padding-top: var(--space-4);
  border-top: 1px solid var(--rule);
}

.page-faq .kb-fact {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-faq .kb-fact__label {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--stone);
}

.page-faq .kb-fact__num {
  margin: 0;
  font-size: 26px;
  line-height: 1;
  color: var(--lime);
  letter-spacing: 0.01em;
}

/* ── 双栏骨架 ───────────────────────────────────── */
.page-faq .kb-layout {
  display: grid;
  gap: var(--space-6);
  margin-top: var(--space-8);
}

/* ── 左侧分类栏 ─────────────────────────────────── */
.page-faq .kb-rail__title {
  margin: 0 0 var(--space-2);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--stone);
}

.page-faq .kb-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 4px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.page-faq .kb-rail__list::-webkit-scrollbar {
  height: 4px;
}

.page-faq .kb-rail__list::-webkit-scrollbar-thumb {
  background: var(--rule);
  border-radius: var(--radius-pill);
}

.page-faq .kb-rail__link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 9px 16px;
  border: 1px solid var(--rule);
  border-radius: var(--radius-pill);
  color: var(--stone);
  font-size: 13px;
  line-height: 1.4;
  white-space: nowrap;
  text-decoration: none;
  transition: color 200ms var(--ease), border-color 200ms var(--ease), background 200ms var(--ease);
}

.page-faq .kb-rail__link::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--stone);
  flex: none;
  transition: background 200ms var(--ease), box-shadow 200ms var(--ease);
}

.page-faq .kb-rail__link:hover,
.page-faq .kb-rail__link:focus-visible {
  color: var(--mist);
  border-color: rgba(79, 209, 197, 0.55);
  background: rgba(79, 209, 197, 0.07);
}

.page-faq .kb-rail__link:hover::before,
.page-faq .kb-rail__link:focus-visible::before {
  background: var(--red);
  box-shadow: 0 0 0 3px rgba(226, 69, 58, 0.18);
}

/* ── 章节 ───────────────────────────────────────── */
.page-faq .kb-sec {
  padding-top: var(--space-8);
}

.page-faq .kb-sec + .kb-sec {
  margin-top: var(--space-8);
  border-top: 1px solid var(--rule);
}

.page-faq .kb-sec .section__title {
  font-size: var(--fs-h2);
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--mist);
  margin: 6px 0 8px;
}

.page-faq .kb-sec .section__title.is-active {
  color: var(--lime);
}

.page-faq .kb-sec .section__note {
  max-width: 56ch;
  color: var(--stone);
  font-size: 15px;
  line-height: 1.8;
}

.page-faq .kb-figure {
  margin: var(--space-6) 0;
}

/* ── 问答条目 ───────────────────────────────────── */
.page-faq .kb-list {
  display: grid;
  gap: 12px;
  margin-top: var(--space-4);
}

.page-faq .kb-item {
  background: var(--panel);
  border: 1px solid var(--rule);
  border-left: 2px solid transparent;
  border-radius: var(--radius-md);
  transition: border-color 200ms var(--ease), background-color 200ms var(--ease);
}

.page-faq .kb-item[open] {
  border-left-color: var(--lime);
  background-color: var(--panel);
  background-image: linear-gradient(180deg, var(--faq-accent-soft), rgba(22, 36, 31, 0) 62%);
}

.page-faq .kb-item__q {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 17px 20px;
  cursor: pointer;
  list-style: none;
  color: var(--mist);
  font-size: 15px;
  font-weight: 600;
  line-height: 1.6;
  transition: color 200ms var(--ease);
}

.page-faq .kb-item__q::-webkit-details-marker {
  display: none;
}

.page-faq .kb-item__q:hover {
  color: var(--lime);
}

.page-faq .kb-item__idx {
  flex: none;
  padding-top: 3px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--lime);
  opacity: 0.85;
}

.page-faq .kb-item__q::after {
  content: "+";
  margin-left: auto;
  padding-top: 1px;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--lime);
}

.page-faq .kb-item[open] .kb-item__q::after {
  content: "–";
}

.page-faq .kb-item__a {
  padding: 0 20px 20px 46px;
  color: var(--stone);
  font-size: 15px;
  line-height: 1.85;
}

.page-faq .kb-item__a a {
  color: var(--aqua);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.page-faq .kb-item__a a:hover {
  color: var(--lime);
}

.page-faq .kb-steps {
  counter-reset: kb-step;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 9px;
}

.page-faq .kb-steps > li {
  counter-increment: kb-step;
  display: flex;
  gap: 10px;
}

.page-faq .kb-steps > li::before {
  content: counter(kb-step, decimal-leading-zero);
  flex: none;
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--lime);
}

/* ── 底部引导 ───────────────────────────────────── */
.page-faq .kb-cta {
  margin-top: var(--space-8);
  padding: var(--space-6);
  border: 1px solid var(--rule);
  border-radius: var(--radius-lg);
  background: var(--bg-night);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  align-items: center;
  justify-content: space-between;
}

.page-faq .kb-cta__title {
  margin: 0 0 6px;
  font-size: var(--fs-h3);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--mist);
}

.page-faq .kb-cta__text {
  margin: 0;
  max-width: 46ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--stone);
}

.page-faq .kb-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-faq .kb-footnote {
  margin: var(--space-6) 0 0;
  padding-top: var(--space-4);
  border-top: 1px solid var(--rule);
  font-size: 13px;
  line-height: 1.8;
  color: var(--stone);
}

.page-faq .kb-footnote a {
  color: var(--aqua);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-faq .kb-footnote a:hover {
  color: var(--lime);
}

/* ── 桌面端 ─────────────────────────────────────── */
@media (min-width: 900px) {
  .page-faq .kb-layout {
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
    gap: var(--space-8);
    align-items: start;
  }

  .page-faq .kb-rail {
    position: sticky;
    top: calc(var(--header-h) + 24px);
    align-self: start;
  }

  .page-faq .kb-rail__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-faq .kb-rail__link {
    border-color: transparent;
    background: transparent;
    border-radius: var(--radius-sm);
    padding: 9px 10px;
    white-space: normal;
  }

  .page-faq .kb-sec .section__head {
    max-width: 68ch;
  }
}

@media (min-width: 1200px) {
  .page-faq .kb-layout {
    gap: 80px;
  }

  .page-faq .kb-item__q {
    font-size: 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .kb-item,
  .page-faq .kb-rail__link,
  .page-faq .kb-item__q {
    transition: none;
  }
}