.page-faq {
  --faq-rail-w: 206px;
  --faq-card-shadow: 5px 5px 0 rgba(5, 11, 20, .38);
  padding-bottom: 76px;
}

/* ---------- 面包屑与首屏 ---------- */
.page-faq .breadcrumbs {
  margin: 18px 0 0;
}

.page-faq .faq-hero {
  position: relative;
  margin-top: 16px;
  padding: 26px 18px 30px;
  background:
    radial-gradient(circle at 86% 4%, rgba(70, 224, 210, .16), transparent 46%),
    radial-gradient(circle at 8% 96%, rgba(255, 90, 54, .12), transparent 42%),
    linear-gradient(158deg, var(--ink-700), var(--ink-800) 62%, var(--ink-900));
  border: 1px solid var(--line-strong);
  box-shadow: var(--shadow-stack);
  overflow: hidden;
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 8px;
  border: 1px solid var(--line-soft);
  pointer-events: none;
}

.page-faq .faq-hero__grid {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
}

.page-faq .faq-hero__copy h1 {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-size: clamp(2.1rem, 8vw, 3.6rem);
  font-weight: 800;
  line-height: 1.02;
  letter-spacing: -.01em;
  color: var(--paper);
  text-wrap: balance;
}

.page-faq .faq-hero__copy .lede {
  margin-top: 14px;
  max-width: 58ch;
  color: var(--mist);
}

.page-faq .faq-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  margin: 20px 0 0;
  padding: 12px 0 0;
  list-style: none;
  border-top: 1px solid var(--line);
  font-size: .8rem;
  color: var(--stone);
  letter-spacing: .04em;
}

.page-faq .faq-hero__meta .mono {
  color: var(--cyan);
  font-size: .95rem;
  font-weight: 600;
}

.page-faq .faq-hero__figure {
  margin: 0;
  border: 1px solid var(--line-strong);
  background: var(--ink-900);
}

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

.page-faq .faq-hero__annotation {
  position: absolute;
  right: 6px;
  bottom: 46px;
  writing-mode: vertical-rl;
  font-size: 11px;
  letter-spacing: .26em;
  color: rgba(169, 194, 216, .45);
}

/* ---------- 索引卡 ---------- */
.page-faq .faq-index {
  margin-top: 26px;
}

.page-faq .faq-index__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 16px;
  margin-bottom: 14px;
}

.page-faq .faq-index__head .section-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.2rem, 4.6vw, 1.6rem);
  font-weight: 700;
  letter-spacing: .01em;
  color: var(--paper);
}

.page-faq .index-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .index-card {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  grid-template-areas:
    "num label"
    "num hint";
  align-items: center;
  column-gap: 12px;
  padding: 12px 14px;
  text-decoration: none;
  background: linear-gradient(150deg, rgba(22, 54, 90, .86), rgba(11, 27, 48, .92));
  border: 1px solid var(--line);
  border-left: 4px solid var(--cyan);
  box-shadow: var(--faq-card-shadow);
  transition: transform .16s ease, border-color .16s ease, box-shadow .16s ease;
}

.page-faq .index-card__num {
  grid-area: num;
  font-size: 1.15rem;
  font-weight: 600;
  color: rgba(169, 194, 216, .5);
}

.page-faq .index-card__label {
  grid-area: label;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--paper);
}

.page-faq .index-card__hint {
  grid-area: hint;
  font-size: .78rem;
  line-height: 1.4;
  color: var(--stone);
}

.page-faq .index-card--signal { border-left-color: var(--signal); }
.page-faq .index-card--moss { border-left-color: var(--moss); }
.page-faq .index-card--clay { border-left-color: var(--clay); }
.page-faq .index-card--mist { border-left-color: var(--mist); }
.page-faq .index-card--stone { border-left-color: var(--stone); }

.page-faq .index-card:hover,
.page-faq .index-card:focus-visible {
  transform: translateY(-2px);
  border-color: var(--cyan);
  box-shadow: 7px 7px 0 rgba(5, 11, 20, .46);
}

.page-faq .index-card:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

/* ---------- 主体：侧栏 + 问答 ---------- */
.page-faq .faq-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
  margin-top: 34px;
}

.page-faq .faq-rail {
  padding: 16px 0 0;
  border-top: 1px solid var(--line);
}

.page-faq .faq-rail__title {
  margin: 0 0 10px;
  font-size: .72rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--stone);
}

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

.page-faq .faq-rail__list li + li {
  margin-top: 2px;
}

.page-faq .faq-rail__list a {
  display: flex;
  gap: 10px;
  padding: 6px 8px;
  font-size: .86rem;
  color: var(--mist);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: color .16s ease, border-color .16s ease, background .16s ease;
}

.page-faq .faq-rail__list .mono {
  font-size: .78rem;
  color: var(--cyan-deep);
}

.page-faq .faq-rail__list a:hover,
.page-faq .faq-rail__list a:focus-visible {
  color: var(--cyan);
  border-left-color: var(--signal);
  background: rgba(70, 224, 210, .07);
  outline: none;
}

.page-faq .faq-rail__list a:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 1px;
}

.page-faq .faq-rail__top {
  display: inline-block;
  margin-top: 16px;
  font-size: .78rem;
  letter-spacing: .08em;
  color: var(--stone);
  text-decoration: none;
  border-bottom: 1px dashed var(--line-strong);
  padding-bottom: 2px;
}

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

/* ---------- 问答组 ---------- */
.page-faq .qa-group {
  padding: 0 0 8px;
  scroll-margin-top: calc(var(--header-h) + 16px);
}

.page-faq .qa-group + .qa-group {
  margin-top: 30px;
  padding-top: 26px;
  border-top: 1px solid var(--line);
}

.page-faq .qa-group__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 4px 12px;
  align-items: start;
  margin-bottom: 16px;
}

.page-faq .qa-group__num {
  grid-row: span 2;
  font-size: clamp(1.5rem, 6vw, 2rem);
  font-weight: 600;
  line-height: 1;
  color: rgba(70, 224, 210, .38);
}

.page-faq .qa-group__head .section-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.22rem, 5vw, 1.62rem);
  font-weight: 700;
  line-height: 1.24;
  letter-spacing: .01em;
  color: var(--paper);
  text-wrap: balance;
}

.page-faq .qa-group__lede {
  grid-column: 2;
  margin: 0;
  font-size: .88rem;
  line-height: 1.7;
  color: var(--stone);
  max-width: 62ch;
}

.page-faq .qa-group__figure {
  margin: 0 0 18px;
  border: 1px solid var(--line);
  background: var(--ink-700);
}

.page-faq .qa-group__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 手风琴 ---------- */
.page-faq .qa {
  background: linear-gradient(180deg, rgba(22, 54, 90, .9), rgba(13, 31, 54, .94));
  border: 1px solid var(--line);
  box-shadow: var(--faq-card-shadow);
  transition: border-color .16s ease, transform .16s ease, box-shadow .16s ease;
}

.page-faq .qa + .qa {
  margin-top: 10px;
}

.page-faq .qa:hover {
  transform: translateY(-1px);
  border-color: var(--line-strong);
  box-shadow: 6px 7px 0 rgba(5, 11, 20, .44);
}

.page-faq .qa[open] {
  border-color: rgba(70, 224, 210, .46);
}

.page-faq .qa__q {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 13px 42px 13px 14px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.4;
  letter-spacing: .01em;
  color: var(--paper);
}

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

.page-faq .qa__q:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -2px;
}

.page-faq .qa[open] .qa__q {
  color: var(--cyan);
  border-bottom: 1px solid var(--line-soft);
}

.page-faq .qa__idx {
  flex: none;
  font-size: .74rem;
  font-weight: 500;
  letter-spacing: .04em;
  color: var(--cyan-deep);
}

.page-faq .qa[open] .qa__idx {
  color: var(--cyan);
}

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

.page-faq .qa__sign {
  position: absolute;
  right: 14px;
  top: 50%;
  width: 12px;
  height: 12px;
  margin-top: -6px;
}

.page-faq .qa__sign::before,
.page-faq .qa__sign::after {
  content: "";
  position: absolute;
  left: 0;
  top: 5px;
  width: 12px;
  height: 2px;
  background: var(--cyan);
  transition: transform .18s ease, opacity .18s ease;
}

.page-faq .qa__sign::after {
  transform: rotate(90deg);
}

.page-faq .qa[open] .qa__sign::after {
  transform: rotate(90deg) scaleX(0);
  opacity: 0;
}

.page-faq .qa__a {
  padding: 12px 14px 14px;
}

.page-faq .qa__a p {
  margin: 0;
  font-size: .9rem;
  line-height: 1.78;
  color: var(--mist);
}

.page-faq .qa__a p + p {
  margin-top: 10px;
}

.page-faq .qa__a a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(70, 224, 210, .45);
}

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

.page-faq .qa__path {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: .82rem !important;
  color: var(--stone) !important;
}

.page-faq .qa__path .tag {
  flex: none;
}

/* ---------- 结尾 ---------- */
.page-faq .faq-outro {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  align-items: center;
  margin-top: 36px;
  padding: 22px 18px;
  background:
    linear-gradient(120deg, rgba(255, 90, 54, .12), transparent 58%),
    var(--ink-700);
  border: 1px solid var(--line-strong);
  border-left: 4px solid var(--signal);
}

.page-faq .faq-outro .section-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.24rem, 5vw, 1.6rem);
  font-weight: 700;
  color: var(--paper);
}

.page-faq .faq-outro__copy p {
  margin: 8px 0 0;
  font-size: .9rem;
  line-height: 1.75;
  color: var(--stone);
  max-width: 56ch;
}

.page-faq .faq-outro__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 中等屏 ---------- */
@media (min-width: 600px) {
  .page-faq .index-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-faq .faq-hero {
    padding: 32px 26px 34px;
  }

  .page-faq .qa__q {
    font-size: 1.06rem;
  }
}

@media (min-width: 760px) {
  .page-faq .index-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    align-items: center;
    gap: 30px;
  }

  .page-faq .faq-outro {
    grid-template-columns: minmax(0, 1fr) auto;
    padding: 26px 26px;
  }
}

/* ---------- 桌面：固定侧栏目录 ---------- */
@media (min-width: 960px) {
  .page-faq .index-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-faq .faq-body {
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
    gap: 34px;
    align-items: start;
    margin-top: 42px;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: calc(var(--header-h) + 20px);
    padding: 18px 16px 18px 0;
    border-top: 0;
    border-right: 1px solid var(--line);
    align-self: start;
  }

  .page-faq .faq-rail__list {
    border-left: 0;
    padding-left: 0;
  }

  .page-faq .faq-rail__list a {
    border-left: 2px solid transparent;
    padding-left: 10px;
  }

  .page-faq .qa-group + .qa-group {
    margin-top: 38px;
    padding-top: 32px;
  }

  .page-faq .qa__q {
    padding: 15px 46px 15px 18px;
  }

  .page-faq .qa__a {
    padding: 14px 18px 18px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .index-card,
  .page-faq .qa,
  .page-faq .qa__sign::before,
  .page-faq .qa__sign::after,
  .page-faq .faq-rail__list a {
    transition: none;
  }

  .page-faq .index-card:hover,
  .page-faq .qa:hover {
    transform: none;
  }
}
<<<END>>>