.page-faq {
  --faq-hair: rgba(18, 35, 63, .12);
  --faq-hair-soft: rgba(18, 35, 63, .08);
  --faq-hair-strong: rgba(18, 35, 63, .22);
  --faq-accent-line: rgba(228, 178, 92, .55);
  background: var(--by-cream);
  color: var(--by-ink);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding: calc(var(--hdr-h) + 34px) 0 22px;
  background: linear-gradient(180deg, var(--by-paper) 0%, var(--by-cream) 82%);
  overflow: hidden;
  isolation: isolate;
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  background-image:
    linear-gradient(to right, rgba(18, 35, 63, .055) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(18, 35, 63, .055) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: radial-gradient(125% 95% at 84% 6%, #000 0%, rgba(0, 0, 0, .30) 46%, transparent 80%);
  mask-image: radial-gradient(125% 95% at 84% 6%, #000 0%, rgba(0, 0, 0, .30) 46%, transparent 80%);
  pointer-events: none;
}

.page-faq .faq-hero > .shell {
  position: relative;
  z-index: 1;
}

.page-faq .breadcrumb {
  margin-bottom: 26px;
}

.page-faq .faq-kicker {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0 0 18px;
  font-size: 13px;
  color: var(--by-slate);
}

.page-faq .faq-kicker .num {
  display: inline-block;
  padding: 3px 10px;
  border-radius: var(--r-pill);
  background: var(--by-red);
  color: #fff;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  line-height: 1.5;
}

.page-faq .faq-hero h1 {
  margin: 0 0 20px;
  max-width: 17ch;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(32px, 6.6vw, 62px);
  line-height: 1.07;
  letter-spacing: -.02em;
  color: var(--by-navy);
}

.page-faq .faq-lede {
  margin: 0;
  max-width: 60ch;
  font-size: clamp(16px, 1.7vw, 18px);
  line-height: 1.78;
  color: var(--by-ink);
}

.page-faq .faq-jump {
  display: flex;
  gap: 10px;
  margin: 0 -2px;
  padding: 24px 2px 10px;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.page-faq .faq-jump::-webkit-scrollbar {
  display: none;
}

.page-faq .faq-jump a {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 10px 18px 10px 14px;
  border: 1px solid var(--faq-hair);
  border-radius: var(--r-pill);
  background: var(--by-paper);
  color: var(--by-navy);
  font-size: 14px;
  text-decoration: none;
  white-space: nowrap;
  transition: border-color .25s var(--ease), transform .25s var(--ease), color .25s var(--ease);
}

.page-faq .faq-jump a:hover,
.page-faq .faq-jump a:focus-visible {
  border-color: var(--by-red);
  color: var(--by-red);
  transform: translateY(-2px);
}

.page-faq .faq-jump .num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--by-red);
}

/* ---------- 主体网格 ---------- */
.page-faq .faq-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
  padding-top: 26px;
  padding-bottom: 64px;
}

.page-faq .faq-rail-inner {
  padding-top: 14px;
  border-top: 1px solid var(--faq-hair);
}

.page-faq .faq-rail-title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--by-slate);
  text-transform: uppercase;
}

.page-faq .faq-rail-list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-faq .faq-rail-list::-webkit-scrollbar {
  display: none;
}

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

.page-faq .faq-rail-list a {
  display: block;
  padding: 8px 14px;
  border: 1px solid var(--faq-hair);
  border-radius: var(--r-pill);
  background: var(--by-paper);
  color: var(--by-slate);
  font-size: 13px;
  text-decoration: none;
  white-space: nowrap;
  transition: color .25s var(--ease), border-color .25s var(--ease), background .25s var(--ease);
}

.page-faq .faq-rail-list a:hover {
  color: var(--by-navy);
  border-color: var(--faq-hair-strong);
}

.page-faq .faq-rail-list a[aria-current="true"] {
  color: var(--by-navy);
  font-weight: 600;
  border-color: var(--by-sand);
}

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

/* ---------- 分类区块 ---------- */
.page-faq .faq-group {
  scroll-margin-top: calc(var(--hdr-h-stuck) + 20px);
}

.page-faq .faq-group + .faq-group {
  margin-top: 56px;
}

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

.page-faq .faq-group-head .section-marker {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--by-slate);
  transition: color .3s var(--ease);
}

.page-faq .faq-group-head .section-marker .num {
  color: inherit;
}

.page-faq .faq-group-head .section-marker.is-active {
  color: var(--by-navy);
}

.page-faq .faq-group-head .section-marker.is-active .num {
  color: var(--by-red);
}

.page-faq .faq-group-title {
  margin: 12px 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(22px, 3.4vw, 30px);
  line-height: 1.26;
  letter-spacing: -.01em;
  color: var(--by-navy);
}

.page-faq .faq-group-note {
  margin: 0;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--by-slate);
}

/* ---------- 配图 ---------- */
.page-faq .faq-figure {
  margin: 0 0 20px;
  padding: 10px;
  border: 1px solid var(--faq-hair);
  border-radius: var(--r-lg);
  background: var(--by-paper);
}

.page-faq .faq-figure .img-frame {
  overflow: hidden;
  border-radius: calc(var(--r-lg) - 8px);
  background: var(--by-mist);
}

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

.page-faq .faq-figure figcaption {
  padding: 10px 6px 4px;
  font-size: 13px;
  line-height: 1.65;
  color: var(--by-slate);
}

/* ---------- 折叠问答 ---------- */
.page-faq .faq-item {
  margin: 0 0 12px;
  border: 1px solid var(--faq-hair);
  border-left: 3px solid var(--by-mist);
  border-radius: var(--r-md);
  background: var(--by-paper);
  overflow: hidden;
  transition: border-color .28s var(--ease), box-shadow .28s var(--ease);
}

.page-faq .faq-item:hover {
  border-left-color: var(--by-sand);
}

.page-faq .faq-item[open] {
  border-left-color: var(--by-red);
  box-shadow: var(--shadow-soft);
}

.page-faq .faq-q {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 17px 18px;
  list-style: none;
  cursor: pointer;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.55;
  color: var(--by-ink);
  transition: transform .25s var(--ease), color .25s var(--ease);
}

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

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

.page-faq .faq-q:focus-visible {
  outline: 2px solid var(--by-sand);
  outline-offset: -3px;
}

.page-faq .faq-item[open] .faq-q {
  transform: translateY(-1px);
  color: var(--by-navy);
}

.page-faq .faq-q-num {
  flex: 0 0 auto;
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--by-slate);
  transition: color .28s var(--ease);
}

.page-faq .faq-item[open] .faq-q-num {
  color: var(--by-red);
}

.page-faq .faq-q-text {
  flex: 1 1 auto;
  min-width: 0;
}

.page-faq .faq-q-mark {
  position: relative;
  flex: 0 0 16px;
  width: 16px;
  height: 16px;
  margin-top: 5px;
  color: var(--by-sand);
  transition: color .28s var(--ease);
}

.page-faq .faq-q-mark::before,
.page-faq .faq-q-mark::after {
  content: "";
  position: absolute;
  border-radius: 2px;
  background: currentColor;
  transition: transform .3s var(--ease);
}

.page-faq .faq-q-mark::before {
  left: 0;
  top: 7px;
  width: 16px;
  height: 2px;
}

.page-faq .faq-q-mark::after {
  left: 7px;
  top: 0;
  width: 2px;
  height: 16px;
}

.page-faq .faq-item[open] .faq-q-mark {
  color: var(--by-red);
}

.page-faq .faq-item[open] .faq-q-mark::after {
  transform: scaleY(0);
}

.page-faq .faq-a {
  margin: 0 18px;
  padding: 14px 0 18px;
  border-top: 1px solid var(--faq-hair-soft);
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--by-ink);
}

.page-faq .faq-a p {
  margin: 0 0 9px;
}

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

.page-faq .faq-a a {
  color: var(--by-red-deep);
  text-decoration: none;
  border-bottom: 1px solid var(--faq-accent-line);
  transition: border-color .25s var(--ease);
}

.page-faq .faq-a a:hover {
  border-bottom-color: var(--by-red);
}

/* ---------- 结尾深色带 ---------- */
.page-faq .faq-cta-band {
  position: relative;
  padding: 54px 0 60px;
  background: linear-gradient(150deg, var(--by-night) 0%, var(--by-navy) 60%, #1B3358 100%);
  color: var(--by-cream);
  overflow: hidden;
  scroll-margin-top: calc(var(--hdr-h-stuck) + 16px);
}

.page-faq .faq-cta-band::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--by-orange), var(--by-red-deep));
}

.page-faq .faq-cta-band::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(247, 241, 230, .06) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(247, 241, 230, .06) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: radial-gradient(90% 120% at 12% 110%, #000 0%, transparent 72%);
  mask-image: radial-gradient(90% 120% at 12% 110%, #000 0%, transparent 72%);
  pointer-events: none;
}

.page-faq .faq-cta-inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 26px;
}

.page-faq .faq-cta-kicker {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--by-sand);
}

.page-faq .faq-cta-copy h2 {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(26px, 4.4vw, 40px);
  line-height: 1.14;
  letter-spacing: -.02em;
  color: #FFFDF8;
}

.page-faq .faq-cta-copy p {
  margin: 0;
  max-width: 52ch;
  font-size: 15.5px;
  line-height: 1.82;
  color: rgba(247, 241, 230, .78);
}

.page-faq .faq-cta-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}

.page-faq .faq-ghost {
  display: inline-flex;
  align-items: center;
  padding: 12px 22px;
  border: 1px solid var(--faq-accent-line);
  border-radius: var(--r-pill);
  color: var(--by-sand);
  font-size: 14.5px;
  text-decoration: none;
  transition: background .25s var(--ease), border-color .25s var(--ease), color .25s var(--ease);
}

.page-faq .faq-ghost:hover,
.page-faq .faq-ghost:focus-visible {
  background: rgba(228, 178, 92, .14);
  border-color: var(--by-sand);
  color: #FFFDF8;
}

/* ---------- 桌面 ---------- */
@media (min-width: 1000px) {
  .page-faq .faq-body {
    grid-template-columns: 232px minmax(0, 1fr);
    gap: 56px;
    padding-top: 34px;
    padding-bottom: 96px;
  }

  .page-faq .faq-rail-inner {
    position: sticky;
    top: calc(var(--hdr-h-stuck) + 24px);
    padding-top: 0;
    border-top: none;
  }

  .page-faq .faq-rail-list {
    flex-direction: column;
    gap: 0;
    padding-bottom: 0;
    overflow: visible;
  }

  .page-faq .faq-rail-list li {
    flex: none;
  }

  .page-faq .faq-rail-list a {
    padding: 10px 0 10px 14px;
    border: none;
    border-left: 2px solid var(--faq-hair);
    border-radius: 0;
    background: transparent;
    font-size: 14px;
  }

  .page-faq .faq-rail-list a:hover {
    padding-left: 18px;
    border-left-color: var(--by-sand);
  }

  .page-faq .faq-rail-list a[aria-current="true"] {
    padding-left: 18px;
  }

  .page-faq .faq-group + .faq-group {
    margin-top: 72px;
  }

  .page-faq .faq-a {
    padding-left: 30px;
  }

  .page-faq .faq-cta-inner {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    gap: 56px;
    align-items: end;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-jump a,
  .page-faq .faq-item,
  .page-faq .faq-q,
  .page-faq .faq-q-num,
  .page-faq .faq-q-mark,
  .page-faq .faq-q-mark::before,
  .page-faq .faq-q-mark::after,
  .page-faq .faq-ghost {
    transition: none;
  }
}