.page-faq {
  --faq-pad: 18px;
  --faq-cut: 12px;
  background: var(--ky-ink);
  color: var(--ky-cream);
  font-family: var(--ky-font-body);
  overflow-x: hidden;
}

.page-faq .faq-top {
  max-width: var(--ky-shell);
  margin: 0 auto;
  padding: 18px var(--faq-pad) 0;
}

.page-faq .faq-crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--ky-font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--ky-t-56);
}

.page-faq .ky-crumbs__link {
  color: var(--ky-t-56);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .18s ease, border-color .18s ease;
}

.page-faq .ky-crumbs__link:hover,
.page-faq .ky-crumbs__link:focus-visible {
  color: var(--ky-cyan);
  border-bottom-color: var(--ky-cyan);
}

.page-faq .ky-crumbs__sep {
  color: var(--ky-t-34);
}

.page-faq .ky-crumbs__current {
  color: var(--ky-gold);
}

/* 首屏 */
.page-faq .faq-hero {
  position: relative;
  margin-top: 16px;
  border-top: 1px solid var(--ky-line-soft);
  border-bottom: 1px solid var(--ky-line-soft);
  background:
    radial-gradient(110% 80% at 100% 0%, rgba(62, 242, 199, .10), transparent 62%),
    linear-gradient(158deg, #0B1F1A 0%, #10291F 58%, #111614 100%);
  overflow: hidden;
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  top: -40px;
  right: -8%;
  width: 46%;
  height: 160%;
  background: linear-gradient(180deg, rgba(216, 178, 106, .12), transparent 70%);
  transform: rotate(12deg);
  pointer-events: none;
}

.page-faq .faq-hero__grid {
  position: relative;
  max-width: var(--ky-shell);
  margin: 0 auto;
  padding: 34px var(--faq-pad) 42px;
  display: grid;
  gap: 30px;
}

.page-faq .ky-kicker {
  margin: 0 0 14px;
  font-family: var(--ky-font-mono);
  font-size: 11px;
  letter-spacing: .22em;
  color: var(--ky-gold);
}

.page-faq .faq-hero__title {
  margin: 0;
  font-family: var(--ky-font-display);
  font-size: clamp(30px, 7.4vw, 52px);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: .01em;
  color: var(--ky-cream);
}

.page-faq .faq-hero__lead {
  margin: 18px 0 0;
  max-width: 48ch;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--ky-t-78);
}

.page-faq .faq-hero__quick {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-hero__quick a {
  display: inline-block;
  padding: 7px 13px;
  border: 1px solid var(--ky-line-soft);
  color: var(--ky-cream);
  font-family: var(--ky-font-mono);
  font-size: 11.5px;
  letter-spacing: .06em;
  text-decoration: none;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%);
  transition: color .18s ease, border-color .18s ease, background .18s ease;
}

.page-faq .faq-hero__quick a:hover,
.page-faq .faq-hero__quick a:focus-visible {
  color: var(--ky-cyan);
  border-color: var(--ky-cyan);
  background: rgba(62, 242, 199, .07);
}

.page-faq .faq-hero__figure {
  margin: 0;
  padding: 10px;
  border: 1px solid var(--ky-line-soft);
  background: rgba(17, 22, 20, .55);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
}

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

.page-faq .faq-hero__figure figcaption {
  padding-top: 10px;
  font-family: var(--ky-font-mono);
  font-size: 10.5px;
  letter-spacing: .06em;
  line-height: 1.6;
  color: var(--ky-t-56);
}

/* 主体分置布局 */
.page-faq .faq-layout {
  max-width: var(--ky-shell);
  margin: 0 auto;
  padding: 34px var(--faq-pad) 62px;
  display: grid;
  gap: 34px;
}

.page-faq .faq-rail {
  border-top: 1px solid var(--ky-line-soft);
  padding-top: 18px;
}

.page-faq .faq-rail__label {
  margin: 0 0 12px;
  font-family: var(--ky-font-mono);
  font-size: 10.5px;
  letter-spacing: .24em;
  color: var(--ky-gold);
}

.page-faq .faq-rail__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 2px;
}

.page-faq .faq-rail__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 10px 12px 10px 13px;
  border-left: 2px solid transparent;
  color: var(--ky-t-78);
  font-size: 14px;
  line-height: 1.5;
  text-decoration: none;
  transition: color .18s ease, border-color .18s ease, background .18s ease;
}

.page-faq .faq-rail__link:hover,
.page-faq .faq-rail__link:focus-visible {
  color: var(--ky-cream);
  border-left-color: var(--ky-cyan);
  background: rgba(62, 242, 199, .06);
}

.page-faq .faq-rail__num {
  font-family: var(--ky-font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--ky-gold);
}

.page-faq .faq-rail__note {
  margin-top: 22px;
  padding: 14px 14px 16px;
  border: 1px solid var(--ky-line-faint);
  border-left: 2px solid var(--ky-gold);
  background: rgba(216, 178, 106, .05);
}

.page-faq .faq-rail__note-title {
  margin: 0;
  font-family: var(--ky-font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--ky-gold);
}

.page-faq .faq-rail__note ul {
  margin: 10px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 7px;
}

.page-faq .faq-rail__note li {
  position: relative;
  padding-left: 14px;
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--ky-t-56);
}

.page-faq .faq-rail__note li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--ky-t-34);
}

.page-faq .faq-rail__cta {
  margin-top: 18px;
  display: inline-block;
}

.page-faq .faq-rail__back {
  display: block;
  margin-top: 12px;
  width: fit-content;
  font-family: var(--ky-font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--ky-t-56);
  text-decoration: none;
  border-bottom: 1px solid var(--ky-line-soft);
  transition: color .18s ease, border-color .18s ease;
}

.page-faq .faq-rail__back:hover,
.page-faq .faq-rail__back:focus-visible {
  color: var(--ky-cyan);
  border-bottom-color: var(--ky-cyan);
}

/* 答案区 */
.page-faq .faq-sec + .faq-sec {
  margin-top: 42px;
  padding-top: 36px;
  border-top: 1px solid var(--ky-line-faint);
}

.page-faq .faq-sec__head {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: baseline;
  gap: 4px 12px;
  margin-bottom: 20px;
}

.page-faq .faq-sec__num {
  font-family: var(--ky-font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--ky-gold);
}

.page-faq .faq-sec__title {
  margin: 0;
  font-family: var(--ky-font-display);
  font-size: clamp(21px, 4.4vw, 29px);
  font-weight: 700;
  line-height: 1.22;
  letter-spacing: .01em;
  color: var(--ky-cream);
}

.page-faq .faq-sec__note {
  grid-column: 1 / -1;
  margin: 8px 0 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--ky-t-56);
}

/* 手风琴 */
.page-faq .faq-item {
  border: 1px solid var(--ky-line-faint);
  background: rgba(17, 22, 20, .5);
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 0 100%);
  transition: border-color .2s ease, background .2s ease, box-shadow .2s ease;
}

.page-faq .faq-item + .faq-item {
  margin-top: 10px;
}

.page-faq .faq-item[open] {
  border-color: rgba(62, 242, 199, .42);
  background: rgba(62, 242, 199, .045);
  box-shadow: inset 2px 0 0 var(--ky-cyan);
}

.page-faq .faq-item__q {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 15px 16px;
  cursor: pointer;
  list-style: none;
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--ky-cream);
  transition: color .18s ease;
}

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

.page-faq .faq-item__q:hover {
  color: var(--ky-cyan);
}

.page-faq .faq-item__q:focus-visible {
  outline: 2px solid var(--ky-cyan);
  outline-offset: -2px;
}

.page-faq .faq-item__num {
  flex: 0 0 auto;
  font-family: var(--ky-font-mono);
  font-size: 11.5px;
  letter-spacing: .06em;
  color: var(--ky-gold);
}

.page-faq .faq-item__mark {
  flex: 0 0 auto;
  margin-left: auto;
  width: 14px;
  text-align: center;
  font-family: var(--ky-font-mono);
  font-size: 15px;
  line-height: 1;
  color: var(--ky-cyan);
}

.page-faq .faq-item__mark::before {
  content: "+";
}

.page-faq .faq-item[open] .faq-item__mark::before {
  content: "−";
}

.page-faq .faq-item__a {
  padding: 0 16px 18px;
  border-top: 1px solid var(--ky-line-faint);
  margin-top: 2px;
  padding-top: 13px;
}

.page-faq .faq-item__a p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.9;
  color: var(--ky-t-78);
}

/* 章节配图 */
.page-faq .faq-figure {
  margin: 24px 0 0;
  padding: 8px;
  border: 1px solid var(--ky-line-faint);
  background: rgba(17, 22, 20, .5);
}

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

.page-faq .faq-figure figcaption {
  padding-top: 8px;
  font-family: var(--ky-font-mono);
  font-size: 10.5px;
  letter-spacing: .06em;
  line-height: 1.6;
  color: var(--ky-t-56);
}

/* 后续入口 */
.page-faq .faq-next {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-top: 26px;
  padding-top: 22px;
  border-top: 1px solid var(--ky-line-faint);
}

.page-faq .faq-next__link {
  font-family: var(--ky-font-mono);
  font-size: 11.5px;
  letter-spacing: .08em;
  color: var(--ky-t-56);
  text-decoration: none;
  border-bottom: 1px solid var(--ky-line-soft);
  transition: color .18s ease, border-color .18s ease;
}

.page-faq .faq-next__link:hover,
.page-faq .faq-next__link:focus-visible {
  color: var(--ky-cyan);
  border-bottom-color: var(--ky-cyan);
}

@media (min-width: 720px) {
  .page-faq {
    --faq-pad: 32px;
  }

  .page-faq .faq-hero__grid {
    padding: 46px var(--faq-pad) 54px;
  }

  .page-faq .faq-hero__lead {
    font-size: 15.5px;
  }

  .page-faq .faq-layout {
    padding-top: 46px;
    padding-bottom: 78px;
  }

  .page-faq .faq-sec__note {
    grid-column: 2 / -1;
  }

  .page-faq .faq-item__q {
    padding: 17px 20px;
    font-size: 15px;
  }

  .page-faq .faq-item__a {
    padding: 15px 20px 20px;
  }

  .page-faq .faq-item__a p {
    font-size: 14px;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: 1.05fr .95fr;
    align-items: center;
    gap: 52px;
    padding: 64px var(--faq-pad) 72px;
  }

  .page-faq .faq-layout {
    grid-template-columns: 264px minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: 92px;
  }

  .page-faq .faq-rail__list {
    gap: 0;
  }

  .page-faq .faq-figure {
    margin-top: 30px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-rail__link,
  .page-faq .faq-item,
  .page-faq .faq-item__q,
  .page-faq .faq-hero__quick a,
  .page-faq .faq-rail__back,
  .page-faq .faq-next__link,
  .page-faq .ky-crumbs__link {
    transition: none;
  }
}