.page-faq {
  --faq-cut: 18px;
  --faq-index-w: 256px;
  position: relative;
}

.page-faq .faq-crumb {
  padding-top: 1.25rem;
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(2.25rem, 6vw, 4.5rem) clamp(1.75rem, 4vw, 3rem);
  border-bottom: 1px solid var(--rule);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--rule) 1px, transparent 1px),
    linear-gradient(to bottom, var(--rule) 1px, transparent 1px);
  background-size: 76px 76px;
  opacity: .55;
  -webkit-mask-image: linear-gradient(to bottom, #000 0%, transparent 88%);
  mask-image: linear-gradient(to bottom, #000 0%, transparent 88%);
  pointer-events: none;
}

.page-faq .faq-hero__inner {
  position: relative;
  z-index: 1;
}

.page-faq .faq-hero h1 {
  margin: .75rem 0 0;
  max-width: 17ch;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(2.15rem, 6.4vw, 4.4rem);
  line-height: 1.03;
  letter-spacing: -.01em;
  color: var(--fg);
}

.page-faq .faq-hero__lede {
  margin: 1.25rem 0 0;
  max-width: 60ch;
  font-size: 1.0625rem;
  line-height: 1.85;
  color: var(--fg-muted);
}

.page-faq .faq-hero__note {
  margin: 1rem 0 0;
  max-width: 60ch;
  font-size: .875rem;
  line-height: 1.8;
  color: var(--fg-faint);
}

/* ---------- 双栏骨架 ---------- */

.page-faq .faq-layout {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.5rem);
  padding-block: clamp(1.75rem, 4vw, 3rem) clamp(3rem, 6vw, 5rem);
}

@media (min-width: 960px) {
  .page-faq .faq-layout {
    grid-template-columns: var(--faq-index-w) minmax(0, 1fr);
    gap: clamp(2rem, 5vw, 4rem);
    align-items: start;
  }
}

/* ---------- 左侧问题索引 ---------- */

.page-faq .faq-index {
  padding: 1.15rem 1.15rem 1.5rem;
  border: 1px solid var(--rule);
  background: var(--bg-raised);
}

@media (min-width: 960px) {
  .page-faq .faq-index {
    position: sticky;
    top: 104px;
    max-height: calc(100vh - 140px);
    overflow-y: auto;
  }
}

.page-faq .faq-index__title {
  margin: 0 0 .5rem;
  font-family: var(--font-mono);
  font-size: .8125rem;
  font-weight: 500;
  letter-spacing: .18em;
  color: var(--fg);
}

.page-faq .faq-index__label {
  display: flex;
  align-items: center;
  gap: .55rem;
  margin: 1.15rem 0 .3rem;
  font-size: .8125rem;
  font-weight: 600;
  letter-spacing: .04em;
  color: var(--amber);
}

.page-faq .faq-index__label:first-of-type {
  margin-top: .5rem;
}

.page-faq .faq-index__tick {
  display: block;
  width: 16px;
  height: 2px;
  background: var(--amber);
  flex: none;
}

.page-faq .faq-index__list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-index__list a {
  position: relative;
  display: block;
  padding: .5rem 0 .5rem 1.15rem;
  font-size: .9063rem;
  line-height: 1.55;
  color: var(--fg-muted);
  text-decoration: none;
  border-bottom: 1px solid var(--rule);
  transition: color .18s ease;
}

.page-faq .faq-index__list li:last-child a {
  border-bottom: 0;
}

.page-faq .faq-index__list a::before {
  content: "";
  position: absolute;
  left: 0;
  top: 1.05rem;
  width: 9px;
  height: 1px;
  background: var(--fg-faint);
  transition: width .18s ease, background .18s ease;
}

.page-faq .faq-index__list a:hover,
.page-faq .faq-index__list a:focus-visible {
  color: var(--fg);
}

.page-faq .faq-index__list a:hover::before,
.page-faq .faq-index__list a:focus-visible::before {
  width: 15px;
  background: var(--pitch-bright);
}

.page-faq .faq-index__list a:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 2px;
}

/* ---------- 右侧问答区 ---------- */

.page-faq .faq-topic {
  padding-block: clamp(1.5rem, 3vw, 2.5rem);
  border-top: 1px solid var(--rule);
  scroll-margin-top: 120px;
}

.page-faq .faq-topic:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-faq .faq-topic__head {
  margin-bottom: 1.5rem;
}

.page-faq .faq-topic__title {
  margin: .35rem 0 0;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(1.6rem, 3.4vw, 2.25rem);
  line-height: 1.15;
  letter-spacing: .01em;
  color: var(--fg);
}

.page-faq .faq-topic__desc {
  margin: .7rem 0 0;
  max-width: 58ch;
  font-size: .9688rem;
  line-height: 1.85;
  color: var(--fg-muted);
}

.page-faq .faq-topic__grid {
  display: grid;
  gap: clamp(1.25rem, 3vw, 2rem);
}

@media (min-width: 1080px) {
  .page-faq .faq-topic__grid--photo {
    grid-template-columns: minmax(0, 1fr) 316px;
    align-items: start;
  }
}

/* ---------- 单个问答面板 ---------- */

.page-faq .qa {
  position: relative;
  margin-bottom: .75rem;
  background: var(--paper);
  color: var(--ink);
  clip-path: polygon(
    0 0,
    calc(100% - var(--faq-cut)) 0,
    100% var(--faq-cut),
    100% 100%,
    0 100%
  );
}

.page-faq .qa:last-child {
  margin-bottom: 0;
}

.page-faq .qa > summary {
  position: relative;
  display: block;
  padding: 1rem 3.25rem 1rem 1.2rem;
  cursor: pointer;
  list-style: none;
  font-size: 1.0625rem;
  font-weight: 600;
  line-height: 1.6;
  color: var(--ink);
}

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

.page-faq .qa > summary::after {
  content: "";
  position: absolute;
  right: 1.5rem;
  top: 1.4rem;
  width: 11px;
  height: 11px;
  border-right: 2px solid var(--pitch);
  border-bottom: 2px solid var(--pitch);
  transform: rotate(45deg);
  transition: transform .2s ease, top .2s ease;
}

.page-faq .qa[open] > summary::after {
  top: 1.6rem;
  transform: rotate(-135deg);
}

.page-faq .qa > summary:hover {
  background: rgba(46, 125, 79, .09);
}

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

.page-faq .qa__body {
  margin: 0 1.2rem;
  padding: .9rem 0 1.25rem;
  border-top: 1px solid rgba(26, 26, 26, .14);
  font-size: .9688rem;
  line-height: 1.85;
  color: var(--ink);
}

.page-faq .qa__body p {
  margin: 0 0 .85rem;
  max-width: 64ch;
}

.page-faq .qa__body p:last-child {
  margin-bottom: 0;
}

.page-faq .qa__body strong {
  font-weight: 600;
  border-bottom: 2px solid rgba(46, 125, 79, .55);
  padding-bottom: 1px;
}

.page-faq .qa__body a {
  color: var(--pitch);
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}

.page-faq .qa__body a:hover,
.page-faq .qa__body a:focus-visible {
  color: var(--pitch-bright);
}

.page-faq .qa__body a:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 2px;
}

/* ---------- 配图 ---------- */

.page-faq .faq-photo {
  margin: 0;
  padding: .5rem;
  border: 1px solid var(--rule);
  background: var(--bg-raised);
}

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

.page-faq .faq-photo figcaption {
  padding: .6rem .3rem .25rem;
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .06em;
  line-height: 1.6;
  color: var(--fg-faint);
}

/* ---------- 底部补充入口 ---------- */

.page-faq .faq-help {
  padding-block: clamp(2.5rem, 5vw, 4rem);
  border-top: 1px solid var(--rule);
  background:
    linear-gradient(118deg, rgba(242, 169, 59, .1), transparent 62%),
    var(--bg-sunken);
}

.page-faq .faq-help__inner {
  display: grid;
  gap: .9rem;
  justify-items: start;
}

.page-faq .faq-help__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(1.5rem, 3.2vw, 2.125rem);
  line-height: 1.2;
  color: var(--fg);
}

.page-faq .faq-help__text {
  margin: 0;
  max-width: 52ch;
  font-size: .9688rem;
  line-height: 1.85;
  color: var(--fg-muted);
}

.page-faq .faq-help__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  margin-top: .5rem;
}

@media (max-width: 599px) {
  .page-faq .qa > summary {
    padding-right: 2.75rem;
    font-size: 1rem;
  }

  .page-faq .qa__body {
    margin: 0 1rem;
  }

  .page-faq .faq-help__actions .btn {
    width: 100%;
    text-align: center;
  }
}
</final>