.page-faq {
  background: var(--porcelain);
  color: var(--ink);
  font-family: var(--font-body);
  line-height: 1.75;
  overflow-x: clip;
}

.page-faq .breadcrumb {
  display: flex;
  align-items: center;
  gap: .5rem;
  padding: 1.5rem 0 .25rem;
  font-family: var(--font-mono);
  font-size: .8125rem;
  letter-spacing: .04em;
  color: var(--mist);
}

.page-faq .breadcrumb__link {
  color: var(--ink-70);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.page-faq .breadcrumb__link:hover {
  color: var(--cinnabar);
  border-bottom-color: var(--cinnabar);
}

.page-faq .breadcrumb__sep {
  color: var(--mist);
}

.page-faq .breadcrumb__current {
  color: var(--ink);
  font-weight: 600;
}

.page-faq .section-label {
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  margin: 0;
  color: var(--patina);
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  padding: .75rem 0 clamp(2.5rem, 6vw, 4.5rem);
}

.page-faq .faq-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.75rem, 4vw, 3rem);
  align-items: start;
}

.page-faq .faq-hero__text {
  max-width: 40rem;
}

.page-faq .faq-hero h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2rem, 6vw, 3.375rem);
  line-height: 1.14;
  letter-spacing: -.01em;
  color: var(--jiang);
  margin: .75rem 0 1.25rem;
}

.page-faq .faq-hero__lede {
  font-size: 1rem;
  color: var(--ink-70);
  margin: 0 0 1.75rem;
  max-width: 36rem;
}

.page-faq .faq-hero__jump {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
}

.page-faq .faq-hero__meta {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: .75rem;
  margin: 2rem 0 0;
  padding: 1.25rem 0 0;
  border-top: 1px solid var(--ink-12);
}

.page-faq .faq-hero__meta-item {
  display: flex;
  flex-direction: column;
  gap: .125rem;
}

.page-faq .faq-hero__meta-item dt {
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .1em;
  color: var(--cinnabar);
  font-weight: 600;
}

.page-faq .faq-hero__meta-item dd {
  margin: 0;
  font-size: .875rem;
  color: var(--ink-70);
}

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

.page-faq .faq-hero__figure .media__frame {
  --media-ratio: 10 / 7;
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, 0 100%);
  background: var(--celadon);
}

.page-faq .faq-hero__figure .media__caption {
  font-family: var(--font-mono);
  font-size: .75rem;
  color: var(--mist);
  margin-top: .75rem;
  letter-spacing: .03em;
}

/* ---------- 三步排查 ---------- */

.page-faq .faq-steps {
  background: var(--jiang);
  color: var(--porcelain);
  padding: clamp(2.75rem, 6vw, 5rem) 0;
  position: relative;
  scroll-margin-top: 5rem;
}

.page-faq .faq-steps::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 88% 12%, rgba(199, 218, 213, .14), transparent 42%),
    radial-gradient(circle at 6% 92%, rgba(178, 58, 46, .16), transparent 38%);
  pointer-events: none;
}

.page-faq .faq-steps .container {
  position: relative;
}

.page-faq .faq-block-head {
  max-width: 42rem;
  margin: 0 0 2.25rem;
}

.page-faq .faq-block-head h2 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.5rem, 3.6vw, 2.25rem);
  line-height: 1.24;
  margin: .625rem 0 .875rem;
}

.page-faq .faq-block-head p {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.8;
}

.page-faq .faq-steps .faq-block-head .section-label {
  color: var(--cinnabar-soft);
}

.page-faq .faq-steps .faq-block-head h2 {
  color: var(--porcelain);
}

.page-faq .faq-steps .faq-block-head p {
  color: var(--light-70);
}

.page-faq .faq-steps__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1rem;
  position: relative;
}

.page-faq .faq-step {
  position: relative;
  padding: 1.5rem 1.25rem 1.5rem 4.25rem;
  background: var(--light-08);
  border: 1px solid var(--light-14);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, 0 100%);
  transition: background-color .24s var(--ease), border-color .24s var(--ease);
}

.page-faq .faq-step:hover {
  background: var(--light-14);
  border-color: var(--light-22);
}

.page-faq .faq-step__num {
  position: absolute;
  left: 1.25rem;
  top: 1.5rem;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 1.5rem;
  line-height: 1;
  color: var(--cinnabar-soft);
  letter-spacing: -.02em;
}

.page-faq .faq-step__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.125rem;
  line-height: 1.4;
  margin: 0 0 .5rem;
  color: var(--porcelain);
}

.page-faq .faq-step__text {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.8;
  color: var(--light-70);
}

.page-faq .faq-steps__figure {
  margin: 2rem 0 0;
}

.page-faq .faq-steps__figure .media__frame {
  --media-ratio: 3 / 2;
  background: rgba(199, 218, 213, .16);
  clip-path: polygon(var(--cut) 0, 100% 0, 100% 100%, 0 100%, 0 var(--cut));
}

.page-faq .faq-steps__figure .media__caption {
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .03em;
  color: var(--light-70);
  margin-top: .75rem;
}

/* ---------- 问答主体 ---------- */

.page-faq .faq-body {
  padding: clamp(2.75rem, 6vw, 5rem) 0 clamp(2rem, 5vw, 3.5rem);
  scroll-margin-top: 5rem;
}

.page-faq .faq-body .faq-block-head .section-label {
  color: var(--cinnabar);
}

.page-faq .faq-body .faq-block-head h2 {
  color: var(--jiang);
}

.page-faq .faq-body .faq-block-head p {
  color: var(--ink-70);
}

.page-faq .faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.75rem;
}

/* 移动端索引：横向滚动条 */
.page-faq .faq-rail {
  margin: 0;
}

.page-faq .faq-rail__label {
  font-family: var(--font-mono);
  font-size: .6875rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  margin: 0 0 .625rem;
  color: var(--patina);
}

.page-faq .faq-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 .5rem;
  display: flex;
  gap: .5rem;
  overflow-x: auto;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.page-faq .faq-rail__item {
  flex: 0 0 auto;
}

.page-faq .faq-rail__link {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding: .5rem .75rem;
  background: var(--porcelain);
  border: 1px solid var(--ink-12);
  color: var(--ink-70);
  text-decoration: none;
  font-size: .8125rem;
  white-space: nowrap;
  transition: color .2s var(--ease), border-color .2s var(--ease), background-color .2s var(--ease);
}

.page-faq .faq-rail__code {
  font-family: var(--font-mono);
  font-size: .6875rem;
  letter-spacing: .05em;
  color: var(--patina);
  transition: color .2s var(--ease);
}

.page-faq .faq-rail__link:hover,
.page-faq .faq-rail__link.is-active {
  color: var(--cinnabar);
  border-color: var(--cinnabar);
  background: rgba(178, 58, 46, .06);
}

.page-faq .faq-rail__link:hover .faq-rail__code,
.page-faq .faq-rail__link.is-active .faq-rail__code {
  color: var(--cinnabar);
}

/* 答案区 */
.page-faq .faq-answers {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2.25rem;
}

.page-faq .faq-group {
  scroll-margin-top: 5.5rem;
}

.page-faq .faq-group__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.25rem;
  line-height: 1.4;
  margin: 0 0 .875rem;
  padding-bottom: .75rem;
  border-bottom: 2px solid var(--ink-12);
  color: var(--jiang);
  position: relative;
}

.page-faq .faq-group__title::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 3rem;
  height: 2px;
  background: var(--cinnabar);
}

.page-faq .faq-q {
  border-bottom: 1px solid var(--ink-12);
  scroll-margin-top: 5.5rem;
}

.page-faq .faq-q__head {
  display: flex;
  align-items: baseline;
  gap: .75rem;
  padding: .875rem 0 .875rem .875rem;
  border-left: 3px solid transparent;
  cursor: pointer;
  list-style: none;
  transition: background-color .2s var(--ease), border-color .2s var(--ease);
}

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

.page-faq .faq-q__head::after {
  content: "+";
  margin-left: auto;
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 1.125rem;
  line-height: 1;
  color: var(--mist);
  transition: color .2s var(--ease);
}

.page-faq .faq-q[open] > .faq-q__head::after {
  content: "−";
  color: var(--cinnabar);
}

.page-faq .faq-q__head:hover {
  background: rgba(199, 218, 213, .3);
}

.page-faq .faq-q[open] > .faq-q__head,
.page-faq .faq-q:target > .faq-q__head {
  border-left-color: var(--cinnabar);
}

.page-faq .faq-q__code {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .05em;
  color: var(--patina);
  transition: color .2s var(--ease);
}

.page-faq .faq-q[open] > .faq-q__head .faq-q__code {
  color: var(--cinnabar);
}

.page-faq .faq-q__title {
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.55;
  color: var(--ink);
}

.page-faq .faq-q__body {
  padding: .25rem 1rem 1.25rem 2.625rem;
  font-size: .9375rem;
  line-height: 1.85;
  color: var(--ink-70);
}

.page-faq .faq-q__body p {
  margin: 0 0 .75rem;
}

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

/* ---------- 收尾 ---------- */

.page-faq .faq-tail {
  background: var(--celadon);
  padding: clamp(2.5rem, 6vw, 4.5rem) 0 clamp(3rem, 7vw, 5.5rem);
  position: relative;
  overflow: hidden;
}

.page-faq .faq-tail::after {
  content: "";
  position: absolute;
  right: -4rem;
  bottom: -6rem;
  width: 18rem;
  height: 18rem;
  border: 1px dashed var(--patina);
  border-radius: 50%;
  opacity: .35;
  pointer-events: none;
}

.page-faq .faq-tail__inner {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.75rem;
  align-items: start;
}

.page-faq .faq-tail .section-label {
  color: var(--cinnabar);
}

.page-faq .faq-tail__text h2 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.5rem, 3.4vw, 2rem);
  line-height: 1.28;
  margin: .625rem 0 .75rem;
  color: var(--jiang);
}

.page-faq .faq-tail__text p {
  margin: 0 0 1rem;
  font-size: .9375rem;
  line-height: 1.8;
  color: var(--ink-70);
  max-width: 34rem;
}

.page-faq .faq-tail__top {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .06em;
  color: var(--patina);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.page-faq .faq-tail__top:hover {
  color: var(--cinnabar);
  border-bottom-color: var(--cinnabar);
}

.page-faq .faq-tail__links {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
}

/* ---------- 宽屏 ---------- */

@media (min-width: 640px) {
  .page-faq .faq-hero__meta {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.5rem;
  }

  .page-faq .faq-steps__list {
    gap: 1.25rem;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    gap: 3rem;
  }

  .page-faq .faq-hero__figure {
    margin-top: .5rem;
  }

  .page-faq .faq-steps__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.5rem;
  }

  .page-faq .faq-step {
    padding: 3.5rem 1.5rem 1.75rem 1.5rem;
  }

  .page-faq .faq-step__num {
    left: 1.5rem;
    top: 1.5rem;
    font-size: 1.75rem;
  }

  .page-faq .faq-layout {
    grid-template-columns: 15rem minmax(0, 1fr);
    gap: 3.5rem;
    align-items: start;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: 5.5rem;
    align-self: start;
  }

  .page-faq .faq-rail__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    border-left: 1px solid var(--ink-12);
    padding-bottom: 0;
  }

  .page-faq .faq-rail__item {
    flex: 1 1 auto;
  }

  .page-faq .faq-rail__link {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: .125rem;
    width: 100%;
    padding: .625rem 0 .625rem .875rem;
    background: transparent;
    border: none;
    border-left: 2px solid transparent;
    margin-left: -1px;
    white-space: normal;
    line-height: 1.5;
  }

  .page-faq .faq-rail__link:hover,
  .page-faq .faq-rail__link.is-active {
    background: rgba(178, 58, 46, .05);
    border-left-color: var(--cinnabar);
  }

  .page-faq .faq-tail__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 2.5rem;
  }

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

@media (min-width: 1120px) {
  .page-faq .faq-hero h1 {
    font-size: 3.5rem;
  }

  .page-faq .faq-q__title {
    font-size: 1.0625rem;
  }

  .page-faq .faq-q__body {
    padding-left: 3rem;
    max-width: 46rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-rail__link,
  .page-faq .faq-step,
  .page-faq .faq-q__head,
  .page-faq .faq-q__head::after,
  .page-faq .faq-tail__top,
  .page-faq .breadcrumb__link {
    transition: none;
  }
}