.page-faq {
  --faq-gap: clamp(1.75rem, 4vw, 3rem);
  background: var(--paper);
  color: var(--fg);
  padding-bottom: clamp(2.5rem, 6vw, 5rem);
}

.page-faq .faq-hero {
  padding-top: clamp(1.5rem, 4vw, 2.75rem);
}

.page-faq .faq-hero__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2rem, 7vw, 3.5rem);
  line-height: 1.12;
  letter-spacing: -0.01em;
  margin: 0.6rem 0 0;
  max-width: 22ch;
  color: var(--pitch-ink-950);
}

.page-faq .faq-hero__lead {
  margin: 1rem 0 0;
  max-width: 40rem;
  font-size: clamp(0.9688rem, 2.2vw, 1.0625rem);
  line-height: 1.8;
  color: var(--fg-soft);
}

.page-faq .faq-hero__figure {
  margin: 1.75rem 0 0;
}

.page-faq .faq-hero__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
  border: 1px solid var(--line-strong);
  box-shadow: var(--shadow-print);
}

/* ---------- 双栏骨架 ---------- */
.page-faq .faq-layout {
  display: grid;
  gap: var(--faq-gap);
  margin-top: clamp(1.75rem, 4vw, 3rem);
}

/* ---------- 左侧分组索引 ---------- */
.page-faq .faq-index {
  border: 1px solid var(--frame-green-900);
  background: var(--frame-green-900);
  padding: 0.8rem 0.9rem 0.9rem;
}

.page-faq .faq-index__title {
  margin: 0 0 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  color: var(--signal-orange-300);
}

.page-faq .faq-index__list {
  display: flex;
  gap: 0.4rem;
  margin: 0;
  padding: 0 0 0.2rem;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-faq .faq-index__item {
  flex: none;
}

.page-faq .faq-index__link {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.35rem 0.6rem;
  font-size: 0.8125rem;
  color: var(--cool-blue-200);
  text-decoration: none;
  white-space: nowrap;
  border: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-faq .faq-index__no {
  font-size: 0.75rem;
  color: var(--signal-orange-300);
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  color: var(--pure-white);
  border-color: var(--signal-orange-600);
  outline: none;
}

/* ---------- 分组 ---------- */
.page-faq .faq-group {
  scroll-margin-top: 1.25rem;
}

.page-faq .faq-group + .faq-group {
  margin-top: clamp(2.25rem, 5vw, 3.5rem);
}

.page-faq .faq-group__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.4rem 0.75rem;
  padding-bottom: 0.7rem;
  border-bottom: 2px solid var(--frame-green-900);
}

.page-faq .faq-group__no {
  font-size: 0.8125rem;
  letter-spacing: 0.06em;
  color: var(--signal-orange-600);
}

.page-faq .faq-group__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.375rem, 3.4vw, 1.75rem);
  letter-spacing: 0.01em;
  color: var(--pitch-ink-950);
}

.page-faq .faq-group__note {
  margin: 0 0 0 auto;
  font-size: 0.8125rem;
  line-height: 1.6;
  color: var(--fg-soft);
}

/* ---------- 问答条 ---------- */
.page-faq .faq-list {
  margin: 0;
  padding: 0 0 0 0.9rem;
  list-style: none;
}

.page-faq .faq-item {
  position: relative;
  border-top: 1px solid var(--line-strong);
}

.page-faq .faq-item:last-child {
  border-bottom: 1px solid var(--line-strong);
}

.page-faq .faq-item::before {
  content: "";
  position: absolute;
  left: -0.9rem;
  top: 1.05rem;
  width: 3px;
  height: 0;
  background: var(--signal-orange-600);
  transition: height var(--dur) var(--ease);
}

.page-faq .faq-item:hover::before,
.page-faq .faq-item[open]::before {
  height: 1.25rem;
}

.page-faq .faq-item > summary {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1rem 0.25rem 1rem 0;
  cursor: pointer;
  list-style: none;
}

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

.page-faq .faq-item > summary:focus-visible {
  outline: 2px solid var(--signal-orange-600);
  outline-offset: 3px;
}

.page-faq .faq-q {
  margin: 0;
  font-family: var(--font-body);
  font-size: clamp(0.9688rem, 2.3vw, 1.0625rem);
  font-weight: 600;
  line-height: 1.6;
  color: var(--pitch-ink-950);
}

.page-faq .faq-item > summary::after {
  content: "+";
  flex: none;
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 1.125rem;
  font-weight: 600;
  line-height: 1.45;
  color: var(--slate-blue-500);
  transition: transform var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-faq .faq-item[open] > summary::after {
  transform: rotate(45deg);
  color: var(--signal-orange-600);
}

.page-faq .faq-a {
  margin: 0;
  max-width: 44rem;
  padding: 0 1.5rem 1.2rem 0;
  font-size: 0.9688rem;
  line-height: 1.8;
  color: var(--fg-soft);
}

.page-faq .faq-a a,
.page-faq .faq-group__note a,
.page-faq .faq-contact__lead a {
  color: var(--pitch-ink-950);
  text-decoration: underline;
  text-decoration-color: var(--signal-orange-600);
  text-underline-offset: 3px;
}

.page-faq .faq-a a:hover,
.page-faq .faq-group__note a:hover,
.page-faq .faq-contact__lead a:hover {
  color: var(--signal-orange-600);
}

/* ---------- 术语对照 ---------- */
.page-faq .faq-terms {
  margin-top: 0.9rem;
  padding: clamp(1.25rem, 4vw, 2.25rem);
  background: var(--indigo-700);
  color: var(--pure-white);
}

.page-faq .faq-terms__list {
  margin: 0;
  display: grid;
  gap: 1rem;
}

.page-faq .faq-terms__row {
  padding-top: 0.7rem;
  border-top: 1px solid var(--line-on-dark);
}

.page-faq .faq-terms dt {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--signal-orange-300);
}

.page-faq .faq-terms dd {
  margin: 0.3rem 0 0;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--pure-white);
  opacity: 0.9;
}

/* ---------- 联系 ---------- */
.page-faq .faq-contact {
  margin-top: 0.9rem;
  display: grid;
  gap: 1.25rem;
  padding: clamp(1.25rem, 4vw, 2rem);
  background: var(--pure-white);
  border: 1px solid var(--line-strong);
  border-left: 4px solid var(--signal-orange-600);
}

.page-faq .faq-contact__lead {
  margin: 0;
  font-size: 0.9688rem;
  line-height: 1.8;
  color: var(--fg-soft);
}

.page-faq .faq-contact__list {
  margin: 1rem 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.55rem;
  font-size: 0.9375rem;
  line-height: 1.6;
  color: var(--fg);
}

.page-faq .faq-contact__label {
  display: inline-block;
  min-width: 3rem;
  margin-right: 0.5rem;
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--slate-blue-500);
}

.page-faq .faq-contact__list a {
  color: var(--pitch-ink-950);
  text-decoration: underline;
  text-decoration-color: var(--signal-orange-600);
  text-underline-offset: 3px;
  word-break: break-all;
}

.page-faq .faq-contact__list a:hover {
  color: var(--signal-orange-600);
}

.page-faq .faq-contact__figure {
  margin: 0;
}

.page-faq .faq-contact__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border: 1px solid var(--line-strong);
}

/* ---------- 断点 ---------- */
@media (min-width: 760px) {
  .page-faq .faq-terms__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.1rem 2.5rem;
  }

  .page-faq .faq-contact {
    grid-template-columns: minmax(0, 1fr) 11rem;
    align-items: start;
    gap: 2rem;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-layout {
    grid-template-columns: 14.5rem minmax(0, 1fr);
    align-items: start;
  }

  .page-faq .faq-index {
    position: sticky;
    top: 1.5rem;
    padding: 1rem 0.9rem 1.25rem;
  }

  .page-faq .faq-index__list {
    display: block;
    overflow: visible;
  }

  .page-faq .faq-index__item + .faq-index__item {
    border-top: 1px solid var(--line-on-dark);
  }

  .page-faq .faq-index__link {
    display: flex;
    padding: 0.62rem 0.2rem;
    white-space: normal;
  }

  .page-faq .faq-group__note {
    font-size: 0.875rem;
  }
}

@media (min-width: 1100px) {
  .page-faq .faq-layout {
    grid-template-columns: 16rem minmax(0, 1fr);
    gap: 3.5rem;
  }

  .page-faq .faq-contact {
    grid-template-columns: minmax(0, 1fr) 13rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item::before,
  .page-faq .faq-item > summary::after,
  .page-faq .faq-index__link {
    transition: none;
  }
}
<<<END>>>