.page-faq {
  --faq-sticky-top: calc(var(--header-h) + 20px);
  --faq-rule: 1px solid var(--line);
  background: var(--ink-bg);
  color: var(--white);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  isolation: isolate;
  padding-block: clamp(20px, 4vw, 40px) clamp(32px, 5vw, 64px);
  background: linear-gradient(158deg, var(--ink-dark) 0%, var(--ink-bg) 58%, var(--ink-bg) 100%);
  border-bottom: var(--faq-rule);
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  z-index: -1;
  top: -24%;
  right: -14%;
  width: min(760px, 82%);
  aspect-ratio: 1 / 1;
  background: radial-gradient(circle at 32% 32%, rgba(35, 224, 200, .22), transparent 64%);
  pointer-events: none;
}

.page-faq .faq-hero__inner {
  display: grid;
  gap: clamp(24px, 4vw, 34px);
}

.page-faq .faq-hero .breadcrumb {
  font-size: var(--fs-12);
  letter-spacing: .04em;
  color: var(--mist);
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

.page-faq .faq-hero .breadcrumb a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .16s ease, border-color .16s ease;
}

.page-faq .faq-hero .breadcrumb a:hover,
.page-faq .faq-hero .breadcrumb a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-faq .faq-hero .breadcrumb [aria-current="page"] {
  color: var(--cyan);
}

.page-faq .faq-hero__lead .eyebrow {
  margin: 0 0 10px;
}

.page-faq .faq-hero h1 {
  margin: 0;
  font-size: var(--fs-48);
  line-height: 1.12;
  letter-spacing: -.02em;
  max-width: 22ch;
  color: var(--white);
}

.page-faq .faq-hero__intro {
  margin: 18px 0 0;
  max-width: 44ch;
  font-size: var(--fs-16);
  line-height: 1.8;
  color: var(--mist);
}

.page-faq .faq-hero__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-faq .faq-hero__figure {
  position: relative;
  margin: 0;
}

.page-faq .faq-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 7;
  object-fit: cover;
  clip-path: polygon(0 0, 100% 6%, 100% 100%, 0 94%);
  opacity: .84;
}

.page-faq .faq-hero__figure .media__cap {
  display: block;
  margin-top: 10px;
  font-size: var(--fs-12);
  letter-spacing: .04em;
  color: var(--mist);
}

/* ---------- 关键数字条 ---------- */
.page-faq .faq-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: var(--faq-rule);
  border-radius: var(--radius-m);
  overflow: hidden;
}

.page-faq .faq-stats li {
  display: grid;
  gap: 8px;
  align-content: start;
  padding: 16px 18px 18px;
  background: var(--ink-dark);
}

.page-faq .faq-stat__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--fs-34);
  line-height: 1;
  letter-spacing: -.01em;
  color: var(--white);
}

.page-faq .faq-stat__num--hot {
  color: var(--yellow);
}

.page-faq .faq-stat__label {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .04em;
  color: var(--mist);
}

/* ---------- 主体布局 ---------- */
.page-faq .faq-main {
  padding-block: clamp(32px, 6vw, 64px) clamp(48px, 8vw, 96px);
}

.page-faq .faq-layout {
  display: grid;
  gap: clamp(28px, 5vw, 52px);
}

/* ---------- 左侧定位索引 ---------- */
.page-faq .faq-toc {
  border: var(--faq-rule);
  border-radius: var(--radius-m);
  background: var(--panel);
  padding: 18px 16px 20px;
}

.page-faq .faq-toc__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line-strong);
  margin-bottom: 12px;
}

.page-faq .faq-toc__head .eyebrow {
  margin: 0;
}

.page-faq .faq-toc__count {
  font-size: var(--fs-12);
  letter-spacing: .04em;
  color: var(--cyan);
}

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

.page-faq .faq-toc__link {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
  padding: 10px 12px;
  border-left: 2px solid transparent;
  color: var(--mist);
  font-size: var(--fs-14);
  line-height: 1.5;
  text-decoration: none;
  transition: color .16s ease, border-color .16s ease, background-color .16s ease;
}

.page-faq .faq-toc__link .mono {
  font-size: var(--fs-12);
  letter-spacing: .04em;
  color: var(--cyan-mid);
  transition: color .16s ease;
}

.page-faq .faq-toc__link:hover,
.page-faq .faq-toc__link:focus-visible {
  color: var(--white);
  background: rgba(35, 224, 200, .07);
  border-left-color: var(--cyan);
}

.page-faq .faq-toc__link:hover .mono,
.page-faq .faq-toc__link:focus-visible .mono {
  color: var(--yellow);
}

.page-faq .faq-toc__foot {
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px dashed var(--line);
}

.page-faq .faq-toc__foot .mono {
  font-size: var(--fs-12);
  letter-spacing: .04em;
  color: var(--yellow);
}

.page-faq .faq-toc__foot p {
  margin: 8px 0 0;
  font-size: var(--fs-12);
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 章节 ---------- */
.page-faq .faq-group {
  scroll-margin-top: calc(var(--header-h) + 24px);
  margin-bottom: clamp(40px, 6vw, 72px);
}

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

.page-faq .faq-group .section-head {
  margin-bottom: 18px;
}

.page-faq .faq-group .section-head__index {
  font-size: var(--fs-12);
  letter-spacing: .04em;
  color: var(--cyan);
}

.page-faq .faq-group .section-head__title {
  font-size: var(--fs-24);
  letter-spacing: -.02em;
  line-height: 1.25;
  color: var(--white);
}

.page-faq .faq-group .section-head__note {
  margin-top: 8px;
  font-size: var(--fs-14);
  line-height: 1.7;
  color: var(--mist);
  max-width: 46ch;
}

/* ---------- 折叠条目 ---------- */
.page-faq .faq-item {
  border-left: 3px solid transparent;
  border-bottom: var(--faq-rule);
  transition: border-color .16s ease, background-color .16s ease;
}

.page-faq .faq-item:first-of-type {
  border-top: var(--faq-rule);
}

.page-faq .faq-item[open] {
  border-left-color: var(--yellow);
  background: rgba(233, 255, 87, .035);
}

.page-faq .faq-item:target {
  border-left-color: var(--cyan);
  background: rgba(35, 224, 200, .06);
}

.page-faq .faq-item > summary {
  list-style: none;
  cursor: pointer;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 14px;
  align-items: baseline;
  padding: 18px 14px 18px 16px;
  font-size: var(--fs-16);
  line-height: 1.6;
  color: var(--white);
  -webkit-tap-highlight-color: transparent;
  transition: background-color .16s ease, color .16s ease;
}

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

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

.page-faq .faq-item > summary:hover {
  background: rgba(35, 224, 200, .06);
}

.page-faq .faq-item > summary::after {
  content: "+";
  grid-column: 3;
  font-family: var(--font-mono);
  font-size: var(--fs-16);
  line-height: 1;
  color: var(--cyan);
}

.page-faq .faq-item[open] > summary::after {
  content: "−";
  color: var(--yellow);
}

.page-faq .faq-item__num {
  grid-column: 1;
  font-size: var(--fs-12);
  letter-spacing: .04em;
  color: var(--cyan-mid);
}

.page-faq .faq-item[open] .faq-item__num {
  color: var(--yellow);
}

.page-faq .faq-item__q {
  grid-column: 2;
}

.page-faq .faq-item__body {
  padding: 4px 16px 22px 16px;
  display: grid;
  gap: 12px;
  max-width: 60ch;
}

.page-faq .faq-item__body p {
  margin: 0;
  font-size: var(--fs-16);
  line-height: 1.8;
  color: var(--mist);
}

.page-faq .faq-item__body a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(35, 224, 200, .4);
  transition: color .16s ease, border-color .16s ease;
}

.page-faq .faq-item__body a:hover,
.page-faq .faq-item__body a:focus-visible {
  color: var(--yellow);
  border-bottom-color: var(--yellow);
}

/* ---------- 术语表 ---------- */
.page-faq .faq-glossary {
  display: grid;
  gap: 28px;
}

.page-faq .glossary {
  margin: 0;
  border-top: var(--faq-rule);
}

.page-faq .glossary__row {
  display: grid;
  gap: 6px;
  padding: 16px 12px;
  border-bottom: var(--faq-rule);
  border-left: 3px solid transparent;
  scroll-margin-top: calc(var(--header-h) + 24px);
  transition: background-color .16s ease, border-color .16s ease;
}

.page-faq .glossary__row:hover {
  background: rgba(35, 224, 200, .05);
}

.page-faq .glossary__row:target {
  border-left-color: var(--yellow);
  background: rgba(233, 255, 87, .05);
}

.page-faq .glossary__term {
  font-family: var(--font-mono);
  font-size: var(--fs-14);
  letter-spacing: .04em;
  color: var(--cyan);
}

.page-faq .glossary__row:target .glossary__term {
  color: var(--yellow);
}

.page-faq .glossary__desc {
  margin: 0;
  font-size: var(--fs-16);
  line-height: 1.8;
  color: var(--mist);
  max-width: 56ch;
}

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

.page-faq .faq-glossary__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: var(--radius-m);
  border: 1px solid var(--line-strong);
  opacity: .9;
}

.page-faq .faq-glossary__figure .media__cap {
  display: block;
  margin-top: 10px;
  font-size: var(--fs-12);
  letter-spacing: .04em;
  color: var(--mist);
}

/* ---------- 中屏 ---------- */
@media (min-width: 720px) {
  .page-faq .faq-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-faq .faq-hero__lead {
    max-width: 62ch;
  }

  .page-faq .glossary__row {
    grid-template-columns: minmax(0, 13rem) minmax(0, 1fr);
    gap: 24px;
    align-items: baseline;
  }
}

/* ---------- 桌面双栏 ---------- */
@media (min-width: 900px) {
  .page-faq .faq-hero__inner {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
    grid-template-areas:
      "crumb crumb"
      "lead figure"
      "stats stats";
    column-gap: clamp(36px, 5vw, 72px);
    row-gap: 32px;
    align-items: start;
  }

  .page-faq .faq-hero .breadcrumb {
    grid-area: crumb;
  }

  .page-faq .faq-hero__lead {
    grid-area: lead;
  }

  .page-faq .faq-hero__figure {
    grid-area: figure;
  }

  .page-faq .faq-stats {
    grid-area: stats;
  }
}

@media (min-width: 1000px) {
  .page-faq .faq-layout {
    grid-template-columns: minmax(0, 258px) minmax(0, 1fr);
    align-items: start;
  }

  .page-faq .faq-toc {
    position: sticky;
    top: var(--faq-sticky-top);
    max-height: calc(100vh - var(--header-h) - 44px);
    overflow-y: auto;
  }

  .page-faq .faq-glossary {
    grid-template-columns: minmax(0, 1fr) minmax(0, 22rem);
    gap: 40px;
    align-items: start;
  }

  .page-faq .faq-glossary__figure {
    position: sticky;
    top: var(--faq-sticky-top);
  }
}

/* ---------- 大屏 ---------- */
@media (min-width: 1200px) {
  .page-faq .faq-hero h1 {
    max-width: 18ch;
  }

  .page-faq .faq-item > summary {
    padding-inline: 22px 18px;
  }

  .page-faq .faq-item__body {
    padding-inline: 22px;
  }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-toc__link,
  .page-faq .faq-item,
  .page-faq .glossary__row,
  .page-faq .faq-hero__figure img {
    transition: none;
  }
}
<<<END>>>