.page-faq {
  position: relative;
  background:
    radial-gradient(90% 55% at 8% 2%, rgba(79, 112, 89, .20), transparent 62%),
    radial-gradient(80% 50% at 96% 20%, rgba(56, 225, 212, .08), transparent 60%),
    linear-gradient(180deg, var(--ink-900) 0%, var(--ink-950) 58%, var(--ink-900) 100%);
  scroll-behavior: smooth;
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  position: relative;
  padding: calc(var(--header-h) + 40px) 0 46px;
  border-bottom: 2px solid var(--line-strong);
  overflow: hidden;
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(140, 151, 165, .10) 1px, transparent 1px),
    linear-gradient(90deg, rgba(140, 151, 165, .10) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, .85), transparent 76%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, .85), transparent 76%);
  pointer-events: none;
}

.page-faq .faq-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 30px;
}

.page-faq .faq-hero h1 {
  margin: 14px 0 16px;
  font-family: var(--font-display);
  font-size: clamp(32px, 8.6vw, 58px);
  font-weight: 700;
  line-height: 1.06;
  letter-spacing: -.015em;
  color: var(--cream);
}

.page-faq .faq-hero__lede {
  max-width: 58ch;
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(15px, 4vw, 18px);
  line-height: 1.85;
  color: var(--cream-dim);
}

.page-faq .faq-hero__actions {
  margin-top: 24px;
}

.page-faq .faq-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
  margin: 24px 0 0;
  padding: 16px 0 0;
  border-top: 1px solid var(--line);
  list-style: none;
}

.page-faq .faq-hero__facts li {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  font-size: 13px;
  color: var(--stone);
}

.page-faq .faq-hero__facts b {
  font-family: var(--font-mono);
  font-size: 19px;
  font-weight: 600;
  letter-spacing: .04em;
  color: var(--cyan);
}

.page-faq .faq-hero__media {
  position: relative;
  border: 2px solid var(--line-strong);
  background: var(--ink-800);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
}

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

/* ---------- 手册布局 ---------- */

.page-faq .faq-book {
  padding: 46px 0 72px;
}

.page-faq .faq-layout {
  display: grid;
  gap: 30px;
}

.page-faq .faq-index {
  border: 2px solid var(--line-strong);
  background: var(--ink-800);
  padding: 16px;
}

.page-faq .faq-index__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--clay);
}

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

.page-faq .faq-index__list li {
  flex: none;
}

.page-faq .faq-index__list a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 14px;
  border: 2px solid var(--line);
  color: var(--cream-dim);
  font-size: 14px;
  white-space: nowrap;
  text-decoration: none;
  transition: border-color .18s var(--ease), color .18s var(--ease), background-color .18s var(--ease);
}

.page-faq .faq-index__list a:hover {
  border-color: var(--cyan);
  color: var(--cream);
  background: var(--cyan-wash);
}

.page-faq .faq-index__list a[aria-current="true"] {
  border-color: var(--cyan);
  color: var(--cream);
  background: var(--cyan-wash);
}

.page-faq .faq-index__no {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--cyan);
}

.page-faq .faq-index__foot {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
  font-size: 13px;
  line-height: 1.7;
  color: var(--stone);
}

/* ---------- 分类区块 ---------- */

.page-faq .faq-cat {
  margin-bottom: 52px;
  scroll-margin-top: calc(var(--header-h) + 24px);
}

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

.page-faq .faq-cat__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 14px;
  padding-bottom: 14px;
  border-bottom: 2px solid var(--line-strong);
}

.page-faq .faq-cat__no {
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: .14em;
  color: var(--clay);
}

.page-faq .faq-cat__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(23px, 6.4vw, 34px);
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--cream);
}

.page-faq .faq-cat__note {
  flex: 1 1 100%;
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--stone);
}

/* ---------- 三步示意图 ---------- */

.page-faq .faq-steps {
  margin: 22px 0 6px;
  border: 2px solid var(--line-strong);
  background: var(--ink-800);
  box-shadow: var(--shadow-hard);
}

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

.page-faq .faq-steps figcaption {
  padding: 12px 16px;
  border-top: 2px solid var(--line-strong);
  font-size: 13px;
  line-height: 1.7;
  color: var(--cream-soft);
}

/* ---------- 问答条目 ---------- */

.page-faq .faq-list {
  margin-top: 4px;
}

.page-faq .faq-item {
  border-bottom: 2px solid var(--line);
}

.page-faq .faq-item__q {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 18px 0;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-body);
  font-size: clamp(15px, 4.2vw, 18px);
  font-weight: 600;
  line-height: 1.6;
  color: var(--cream);
  transition: color .18s var(--ease);
}

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

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

.page-faq .faq-item__q::after {
  content: "+";
  flex: none;
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1.3;
  color: var(--cyan);
}

.page-faq .faq-item__q:hover {
  color: var(--cyan);
}

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

.page-faq .faq-item[open] .faq-item__q::after {
  content: "–";
}

.page-faq .faq-item__a {
  max-width: 66ch;
  margin: 0 0 20px 4px;
  padding-left: 16px;
  border-left: 2px solid var(--clay);
  font-size: 16px;
  line-height: 1.85;
  color: var(--cream-dim);
}

.page-faq .faq-item__a p {
  margin: 0 0 12px;
}

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

/* ---------- 桌面端 ---------- */

@media (min-width: 900px) {
  .page-faq .faq-hero {
    padding: calc(var(--header-h) + 56px) 0 62px;
  }

  .page-faq .faq-hero__inner {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr);
    align-items: center;
    gap: 52px;
  }

  .page-faq .faq-hero__media {
    box-shadow: var(--shadow-cyan);
  }

  .page-faq .faq-steps {
    margin: 26px 0 10px;
  }
}

@media (min-width: 1040px) {
  .page-faq .faq-book {
    padding: 62px 0 96px;
  }

  .page-faq .faq-layout {
    grid-template-columns: 268px minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }

  .page-faq .faq-index {
    position: sticky;
    top: calc(var(--header-h) + 22px);
    padding: 20px;
  }

  .page-faq .faq-index__list {
    flex-direction: column;
    gap: 6px;
    padding-bottom: 0;
    overflow: visible;
  }

  .page-faq .faq-index__list li {
    flex: 1 1 auto;
  }

  .page-faq .faq-index__list a {
    width: 100%;
    white-space: normal;
    line-height: 1.5;
  }

  .page-faq .faq-cat {
    margin-bottom: 64px;
  }

  .page-faq .faq-item__q {
    padding: 20px 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq {
    scroll-behavior: auto;
  }

  .page-faq .faq-index__list a,
  .page-faq .faq-item__q {
    transition: none;
  }
}
<<<END>>>