.page-faq {
  --faq-rail: 232px;
  --faq-gap: clamp(28px, 4vw, 72px);
  --faq-no-w: 52px;
}

/* ============ 首屏 ============ */
.page-faq .faq-hero {
  position: relative;
  padding: clamp(30px, 4.5vw, 64px) 0 0;
  background:
    radial-gradient(120% 110% at 90% -10%, rgba(199, 154, 46, 0.14), transparent 58%),
    radial-gradient(80% 70% at 4% 8%, rgba(166, 36, 28, 0.07), transparent 58%);
}

.page-faq .faq-hero .crumbs {
  margin-bottom: 22px;
}

.page-faq .faq-hero__title {
  margin: 10px 0 0;
  max-width: 16ch;
}

.page-faq .faq-hero__lede {
  margin: 20px 0 0;
  max-width: 60ch;
  color: var(--ink-70);
}

.page-faq .faq-hero__chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-hero__figure {
  margin: clamp(30px, 4.5vw, 56px) 0 0;
  border-radius: var(--radius-l);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--butter);
  box-shadow: 0 30px 60px -46px rgba(23, 22, 26, 0.45);
}

.page-faq .faq-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1200 / 560;
  object-fit: cover;
}

/* ============ 主体双栏 ============ */
.page-faq .faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--faq-gap);
  align-items: start;
  padding: clamp(36px, 5vw, 72px) 0 clamp(48px, 6vw, 88px);
}

.page-faq .faq-toc__cap {
  position: relative;
  margin: 0 0 16px;
  padding-left: 26px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--gold-dark);
}

.page-faq .faq-toc__cap::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 16px;
  height: 1px;
  background: var(--gold);
}

.page-faq .faq-toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
}

.page-faq .faq-toc__list a {
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr);
  gap: 10px;
  align-items: baseline;
  padding: 8px 10px 8px 0;
  color: var(--ink-70);
  text-decoration: none;
  font-size: 13px;
  line-height: 1.5;
  border-radius: var(--radius-s);
  transition: color 0.2s var(--ease), background-color 0.2s var(--ease), padding-left 0.2s var(--ease);
}

.page-faq .faq-toc__list a:hover,
.page-faq .faq-toc__list a:focus-visible {
  color: var(--red);
  background: rgba(166, 36, 28, 0.06);
  padding-left: 8px;
}

.page-faq .faq-toc__num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--gold-dark);
}

/* ============ 章节与问答 ============ */
.page-faq .faq-body {
  min-width: 0;
}

.page-faq .faq-sec {
  margin: 0 0 clamp(44px, 6vw, 84px);
}

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

.page-faq .faq-sec > .h-sec {
  margin: 8px 0 0;
  max-width: 24ch;
  scroll-margin-top: 96px;
}

.page-faq .faq-sec__lede {
  margin: 14px 0 0;
  max-width: 56ch;
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink-70);
}

.page-faq .faq-q {
  border-top: 1px solid var(--line);
  margin-top: clamp(20px, 2.6vw, 30px);
}

.page-faq .faq-q:last-of-type {
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-q > summary {
  display: grid;
  grid-template-columns: var(--faq-no-w) minmax(0, 1fr) 30px;
  gap: 14px;
  align-items: start;
  padding: clamp(18px, 2.2vw, 26px) 2px;
  cursor: pointer;
  list-style: none;
  scroll-margin-top: 96px;
}

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

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

.page-faq .faq-q > summary:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 3px;
  border-radius: var(--radius-s);
}

.page-faq .faq-q__no {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: clamp(26px, 3.2vw, 40px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: rgba(140, 107, 31, 0.28);
  min-width: var(--faq-no-w);
  user-select: none;
  transition: color 0.25s var(--ease);
}

.page-faq .faq-q__t {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(18px, 2.1vw, 24px);
  line-height: 1.45;
  color: var(--ink);
  padding-top: 2px;
  transition: color 0.2s var(--ease);
}

.page-faq .faq-q > summary:hover .faq-q__t {
  color: var(--red);
}

.page-faq .faq-q__mark {
  display: grid;
  place-items: center;
  width: 28px;
  height: 28px;
  margin-top: 4px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--line-strong);
  color: var(--gold-dark);
  font-size: 15px;
  line-height: 1;
  transition: transform 0.3s var(--ease), background-color 0.3s var(--ease),
    border-color 0.3s var(--ease), color 0.3s var(--ease);
}

.page-faq .faq-q[open] .faq-q__mark {
  transform: rotate(45deg);
  background: var(--gold);
  border-color: var(--gold);
  color: var(--white);
}

.page-faq .faq-q[open] .faq-q__no {
  color: rgba(166, 36, 28, 0.55);
}

.page-faq .faq-q__body {
  margin: 0 0 0 calc(var(--faq-no-w) + 14px);
  padding: 14px 2px 28px;
  border-top: 1px solid rgba(199, 154, 46, 0.55);
}

.page-faq .faq-q__body p {
  margin: 0 0 12px;
  max-width: 66ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--ink-70);
}

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

.page-faq .faq-q__body strong {
  color: var(--ink);
  font-weight: 700;
}

.page-faq .faq-q__body ul {
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
  max-width: 66ch;
}

.page-faq .faq-q__body ul li {
  position: relative;
  padding-left: 20px;
  font-size: 16px;
  line-height: 1.72;
  color: var(--ink-70);
}

.page-faq .faq-q__body ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.75em;
  width: 10px;
  height: 1px;
  background: var(--gold);
}

/* ============ 术语 / 字段对照 ============ */
.page-faq .faq-terms {
  margin: 6px 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-faq .faq-terms__row {
  display: grid;
  grid-template-columns: minmax(76px, 132px) minmax(0, 1fr);
  gap: 6px 18px;
  padding: 12px 8px 12px 0;
  border-bottom: 1px solid var(--line);
  transition: background-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-faq .faq-terms__row:hover {
  background: rgba(199, 154, 46, 0.08);
  transform: translateX(2px);
}

.page-faq .faq-terms__k {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.6;
  color: var(--gold-dark);
}

.page-faq .faq-terms__v {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--ink-70);
}

/* ============ 区间示意图 ============ */
.page-faq .faq-figure {
  margin: 22px 0 4px;
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1000 / 600;
  object-fit: cover;
  border-radius: var(--radius-m);
  border: 1px solid var(--line);
  background: var(--butter);
}

.page-faq .faq-figure figcaption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--ink-55);
}

/* ============ 收束带 ============ */
.page-faq .faq-next-band {
  padding-block: clamp(48px, 6vw, 88px);
}

.page-faq .faq-next-band .sec-index {
  color: var(--gold);
}

.page-faq .faq-next-band .h-sec {
  margin: 10px 0 0;
  max-width: 24ch;
  color: var(--paper);
}

.page-faq .faq-next-band > .wrap > p {
  margin: 18px 0 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--paper-70);
}

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

.page-faq .faq-next-band .btn--ghost {
  color: var(--paper);
  border-color: rgba(244, 237, 224, 0.35);
}

.page-faq .faq-next-band .btn--ghost:hover,
.page-faq .faq-next-band .btn--ghost:focus-visible {
  color: var(--gold);
  border-color: var(--gold);
}

/* ============ 窄屏 ============ */
@media (max-width: 1079px) {
  .page-faq {
    --faq-no-w: 38px;
    --faq-gap: 28px;
  }

  .page-faq .faq-hero__title {
    max-width: none;
  }

  .page-faq .faq-hero__figure {
    border-radius: var(--radius-m);
  }

  .page-faq .faq-toc {
    margin-bottom: 4px;
  }

  .page-faq .faq-toc__list {
    display: flex;
    gap: 8px;
    overflow-x: auto;
    padding: 0 0 8px;
    -webkit-overflow-scrolling: touch;
  }

  .page-faq .faq-toc__list li {
    flex: 0 0 auto;
  }

  .page-faq .faq-toc__list a {
    grid-template-columns: auto auto;
    gap: 8px;
    padding: 8px 14px;
    white-space: nowrap;
    background: var(--white);
    border: 1px solid var(--line);
    border-radius: var(--radius-pill);
    font-size: 12.5px;
  }

  .page-faq .faq-toc__list a:hover,
  .page-faq .faq-toc__list a:focus-visible {
    padding-left: 14px;
  }

  .page-faq .faq-q > summary {
    grid-template-columns: var(--faq-no-w) minmax(0, 1fr) 26px;
    gap: 10px;
  }

  .page-faq .faq-q__mark {
    width: 26px;
    height: 26px;
    font-size: 14px;
  }

  .page-faq .faq-q__body {
    margin-left: 0;
    padding-bottom: 24px;
  }

  .page-faq .faq-terms__row {
    grid-template-columns: minmax(70px, 104px) minmax(0, 1fr);
    gap: 4px 14px;
  }
}

@media (max-width: 520px) {
  .page-faq .faq-q__body p,
  .page-faq .faq-q__body ul li {
    font-size: 15.5px;
  }

  .page-faq .faq-terms__row {
    grid-template-columns: minmax(0, 1fr);
    gap: 4px;
    padding: 12px 4px 12px 0;
  }

  .page-faq .faq-terms__row:hover {
    transform: none;
  }

  .page-faq .faq-next__links .btn {
    flex: 1 1 auto;
    text-align: center;
  }
}

@media (min-width: 1080px) {
  .page-faq .faq-layout {
    grid-template-columns: var(--faq-rail) minmax(0, 1fr);
  }

  .page-faq .faq-toc {
    position: sticky;
    top: 96px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-toc__list a,
  .page-faq .faq-q__mark,
  .page-faq .faq-q__no,
  .page-faq .faq-q__t,
  .page-faq .faq-terms__row {
    transition: none;
  }

  .page-faq .faq-terms__row:hover {
    transform: none;
  }
}