.page-faq {
  --faq-line: var(--ice-line);
  --faq-dark: var(--polar-900);
  --faq-panel: var(--polar-800);
  --faq-soft: rgba(244, 248, 250, 0.66);
  background: var(--ice);
  color: var(--ink);
  display: block;
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  position: relative;
  padding-top: clamp(20px, 4vw, 40px);
  padding-bottom: clamp(36px, 6vw, 76px);
  background:
    linear-gradient(138deg, rgba(79, 240, 192, 0.09) 0%, rgba(79, 240, 192, 0) 46%),
    linear-gradient(300deg, rgba(182, 101, 63, 0.16) 0%, rgba(182, 101, 63, 0) 40%),
    var(--polar-900);
  color: var(--ice);
  overflow: hidden;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  inset: auto -10% -60% auto;
  width: clamp(240px, 40vw, 520px);
  height: clamp(240px, 40vw, 520px);
  border-radius: 50%;
  background: radial-gradient(circle, rgba(79, 240, 192, 0.14) 0%, rgba(79, 240, 192, 0) 68%);
  pointer-events: none;
}

.page-faq .faq-hero .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 13px;
  line-height: 1.6;
}

.page-faq .faq-hero .breadcrumb-list li {
  color: rgba(244, 248, 250, 0.6);
}

.page-faq .faq-hero .breadcrumb-list li + li::before {
  content: "/";
  margin-right: 8px;
  color: rgba(244, 248, 250, 0.3);
}

.page-faq .faq-hero .breadcrumb-list a {
  color: rgba(244, 248, 250, 0.84);
  text-decoration: none;
  transition: color 160ms ease;
}

.page-faq .faq-hero .breadcrumb-list a:hover {
  color: var(--orange);
}

.page-faq .faq-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 52px);
  margin-top: clamp(22px, 4vw, 44px);
}

.page-faq .faq-kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--orange);
}

.page-faq .faq-title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 5.2vw, 58px);
  line-height: 1.08;
  letter-spacing: -0.015em;
  color: var(--ice);
}

.page-faq .faq-lead {
  margin: clamp(14px, 2vw, 22px) 0 0;
  max-width: 48ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.8;
  color: rgba(244, 248, 250, 0.86);
}

.page-faq .faq-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: clamp(18px, 2.6vw, 28px);
}

.page-faq .data-stamp {
  display: inline-flex;
  align-items: center;
  padding: 6px 12px;
  border: 1px solid rgba(79, 240, 192, 0.4);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--cyan);
}

.page-faq .data-stamp--soft {
  border-color: rgba(207, 227, 238, 0.28);
  color: rgba(244, 248, 250, 0.72);
}

.page-faq .faq-hero__figure {
  margin: 0;
  border: 1px solid rgba(207, 227, 238, 0.26);
  background: var(--polar-800);
  overflow: hidden;
}

.page-faq .faq-hero__figure .media-frame__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 5 / 3;
  object-fit: cover;
}

/* ---------- 筛选条 ---------- */

.page-faq .faq-filters {
  padding-top: clamp(22px, 3.6vw, 38px);
  padding-bottom: clamp(22px, 3.6vw, 38px);
  background: var(--polar-800);
  border-top: 1px solid rgba(207, 227, 238, 0.14);
  color: var(--ice);
}

.page-faq .faq-filters__head {
  display: grid;
  gap: 6px;
}

.page-faq .faq-filters__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(18px, 2vw, 22px);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--ice);
}

.page-faq .faq-filters__hint {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(244, 248, 250, 0.62);
}

.page-faq .filter-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.page-faq .filter-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 16px;
  border: 1px solid rgba(207, 227, 238, 0.3);
  border-radius: 999px;
  background: transparent;
  color: var(--ice);
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.2;
  cursor: pointer;
  transition: background-color 180ms ease, border-color 180ms ease, color 180ms ease;
}

.page-faq .filter-chip:hover {
  border-color: var(--orange);
  color: #ffffff;
}

.page-faq .filter-chip[aria-pressed="true"] {
  background: var(--orange);
  border-color: var(--orange);
  color: var(--polar-900);
  font-weight: 700;
}

.page-faq .filter-chip .filter-count {
  font-family: var(--font-mono);
  font-size: 12px;
  opacity: 0.72;
}

/* ---------- 两栏主体 ---------- */

.page-faq .faq-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 56px);
  padding-top: clamp(30px, 5vw, 64px);
  padding-bottom: clamp(40px, 6vw, 84px);
  align-items: start;
}

.page-faq .faq-index {
  position: relative;
  align-self: start;
}

.page-faq .faq-index__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--moss);
}

.page-faq .faq-index__list {
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--faq-line);
}

.page-faq .faq-index__item {
  border-bottom: 1px solid var(--faq-line);
}

.page-faq .chapter-link {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 12px;
  align-items: baseline;
  padding: 12px 2px;
  color: var(--ink);
  text-decoration: none;
  font-size: 15px;
  line-height: 1.5;
  transition: color 160ms ease, transform 160ms ease;
}

.page-faq .chapter-link:hover {
  color: var(--clay);
  transform: translateX(2px);
}

.page-faq .chapter-link[data-active],
.page-faq .faq-index__item[data-active] .chapter-link {
  color: var(--orange);
}

.page-faq .faq-index__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--stone);
}

.page-faq .chapter-link[data-active] .faq-index__num,
.page-faq .faq-index__item[data-active] .faq-index__num {
  color: var(--orange);
}

.page-faq .faq-index__count {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--stone);
}

.page-faq .faq-index__note {
  margin: 18px 0 0;
  padding-left: 12px;
  border-left: 2px solid var(--paper);
  font-size: 13px;
  line-height: 1.75;
  color: var(--stone);
}

/* ---------- 分组与手风琴 ---------- */

.page-faq .faq-panel {
  min-width: 0;
}

.page-faq .faq-group {
  scroll-margin-top: calc(var(--header-height) + 20px);
}

.page-faq .faq-group + .faq-group {
  margin-top: clamp(34px, 5vw, 58px);
}

.page-faq .faq-group__head {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 4px 14px;
  align-items: baseline;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--polar-900);
}

.page-faq .faq-group__num {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--orange);
}

.page-faq .faq-group__head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(20px, 2.4vw, 28px);
  font-weight: 800;
  letter-spacing: -0.01em;
  line-height: 1.25;
  color: var(--ink);
}

.page-faq .faq-group__desc {
  grid-column: 2;
  margin: 2px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--stone);
}

.page-faq .faq-item {
  border-bottom: 1px solid var(--faq-line);
  background: transparent;
  transition: background-color 180ms ease;
}

.page-faq .faq-item summary {
  position: relative;
  display: grid;
  grid-template-columns: 2.6em 1fr;
  gap: 6px;
  align-items: baseline;
  padding: 15px 30px 15px 0;
  cursor: pointer;
  list-style: none;
}

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

.page-faq .faq-item summary::marker {
  content: "";
}

.page-faq .faq-item summary::after {
  content: "";
  position: absolute;
  right: 6px;
  top: 50%;
  width: 8px;
  height: 8px;
  margin-top: -5px;
  border-right: 2px solid var(--stone);
  border-bottom: 2px solid var(--stone);
  transform: rotate(45deg);
  transition: transform 200ms ease, border-color 200ms ease;
}

.page-faq .faq-item[open] summary::after {
  transform: rotate(-135deg);
  border-color: var(--orange);
}

.page-faq .faq-num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--stone);
  padding-top: 2px;
}

.page-faq .faq-q {
  font-size: clamp(15px, 1.6vw, 17px);
  font-weight: 600;
  line-height: 1.65;
  color: var(--ink);
  transition: color 160ms ease;
}

.page-faq .faq-item summary:hover .faq-q,
.page-faq .faq-item[open] .faq-q {
  color: var(--clay);
}

.page-faq .faq-a {
  position: relative;
  padding: 0 30px 18px 2.6em;
}

.page-faq .faq-a::before {
  content: "";
  position: absolute;
  left: 0;
  top: 3px;
  bottom: 18px;
  width: 2px;
  background: var(--orange);
  opacity: 0;
  transform: translateX(-4px);
  transition: opacity 200ms ease, transform 200ms ease;
}

.page-faq .faq-item[open] .faq-a::before {
  opacity: 1;
  transform: translateX(0);
}

.page-faq .faq-a p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink);
  opacity: 0.82;
}

.page-faq .faq-a p + p {
  margin-top: 8px;
}

.page-faq .faq-a a {
  color: var(--moss);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color 160ms ease;
}

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

.page-faq .faq-figure {
  margin: 22px 0 0;
  border: 1px solid var(--faq-line);
  background: var(--paper);
  overflow: hidden;
}

.page-faq .faq-figure .media-frame__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

/* ---------- 底部反馈 ---------- */

.page-faq .faq-contact {
  position: relative;
  padding-top: clamp(30px, 5vw, 62px);
  padding-bottom: clamp(30px, 5vw, 62px);
  background:
    linear-gradient(96deg, rgba(255, 107, 44, 0.14) 0%, rgba(255, 107, 44, 0) 52%),
    var(--polar-900);
  color: var(--ice);
}

.page-faq .faq-contact__inner {
  display: grid;
  gap: 22px;
}

.page-faq .faq-contact h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(22px, 3vw, 34px);
  font-weight: 900;
  letter-spacing: -0.015em;
  line-height: 1.2;
  color: var(--ice);
}

.page-faq .faq-contact p {
  margin: 12px 0 0;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(244, 248, 250, 0.78);
}

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

.page-faq .faq-contact .btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: 2px;
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  transition: transform 160ms ease, background-color 160ms ease, color 160ms ease, border-color 160ms ease;
}

.page-faq .faq-contact .btn--primary {
  background: var(--orange);
  border: 1px solid var(--orange);
  color: var(--polar-900);
}

.page-faq .faq-contact .btn--primary:hover {
  transform: translateY(-2px);
}

.page-faq .faq-contact .btn--ghost {
  background: transparent;
  border: 1px solid rgba(244, 248, 250, 0.42);
  color: var(--ice);
}

.page-faq .faq-contact .btn--ghost:hover {
  border-color: var(--cyan);
  color: var(--cyan);
  transform: translateY(-2px);
}

/* ---------- 响应式 ---------- */

@media (min-width: 760px) {
  .page-faq .faq-filters__head {
    grid-template-columns: auto 1fr;
    align-items: baseline;
    gap: 24px;
  }

  .page-faq .faq-contact__inner {
    grid-template-columns: 8fr 4fr;
    align-items: end;
    gap: 28px;
  }

  .page-faq .faq-contact__actions {
    justify-content: flex-end;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: 7fr 5fr;
    align-items: end;
  }

  .page-faq .faq-body {
    grid-template-columns: 4fr 8fr;
  }

  .page-faq .faq-index {
    position: sticky;
    top: calc(var(--header-height) + 24px);
  }

  .page-faq .faq-index__list {
    margin-top: 16px;
  }
}

@media (min-width: 1180px) {
  .page-faq .faq-item summary {
    padding-top: 18px;
    padding-bottom: 18px;
  }

  .page-faq .faq-a {
    padding-bottom: 22px;
  }
}

@media (max-width: 420px) {
  .page-faq .filter-chip {
    padding: 8px 13px;
    font-size: 13px;
  }

  .page-faq .faq-a {
    padding-right: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .filter-chip,
  .page-faq .chapter-link,
  .page-faq .faq-item,
  .page-faq .faq-item summary::after,
  .page-faq .faq-a::before,
  .page-faq .faq-q,
  .page-faq .btn {
    transition: none;
  }

  .page-faq .chapter-link:hover,
  .page-faq .faq-contact .btn:hover {
    transform: none;
  }

  .page-faq .faq-a::before {
    transform: none;
  }
}
<<<END>>>