.page-faq {
  --faq-idx: 236px;
  --faq-gap: clamp(26px, 3.4vw, 52px);
  color: var(--ink);
}

/* ---------- 面包屑 ---------- */
.page-faq .crumbs {
  margin-bottom: clamp(20px, 3vw, 34px);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding-top: clamp(22px, 3.4vw, 44px);
  padding-bottom: clamp(34px, 5vw, 68px);
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  right: -9%;
  bottom: -48%;
  width: clamp(240px, 36vw, 520px);
  aspect-ratio: 1;
  border: 2px solid var(--line);
  border-radius: 50%;
  border-right-color: transparent;
  border-bottom-color: transparent;
  transform: rotate(16deg);
  pointer-events: none;
}

.page-faq .faq-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 3vw, 40px);
}

.page-faq .faq-hero h1 {
  margin: 12px 0 0;
  font-family: var(--font-title);
  font-size: clamp(30px, 4vw, 52px);
  font-weight: 900;
  line-height: 1.16;
  letter-spacing: -0.02em;
  max-width: 20ch;
}

.page-faq .faq-hero__lede {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.82;
  max-width: 62ch;
}

.page-faq .faq-hero__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-hero__tags li {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--gray);
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  padding: 5px 13px;
}

/* ---------- 主体两栏 ---------- */
.page-faq .faq-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--faq-gap);
}

/* ---------- 左侧问题索引 ---------- */
.page-faq .faq-nav {
  border-top: 2px solid var(--ink);
  padding-top: 14px;
}

.page-faq .faq-nav__label {
  margin: 16px 0 7px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--gray);
}

.page-faq .faq-nav__group:first-of-type .faq-nav__label {
  margin-top: 8px;
}

.page-faq .faq-nav__list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-nav__link {
  display: flex;
  gap: 8px;
  align-items: baseline;
  padding: 6px 8px;
  border-radius: var(--radius-sm);
  color: var(--ink);
  text-decoration: none;
  font-size: 13.5px;
  line-height: 1.5;
  transition: background-color 160ms var(--ease), color 160ms var(--ease), box-shadow 160ms var(--ease);
}

.page-faq .faq-nav__link:hover {
  background: var(--paper);
  color: var(--milan);
}

.page-faq .faq-nav__link[aria-current="location"] {
  background: var(--paper);
  color: var(--milan);
  box-shadow: inset 2px 0 0 var(--milan);
}

.page-faq .faq-nav__num {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--milan);
}

/* ---------- 答案列 ---------- */
.page-faq .faq-cols {
  min-width: 0;
  display: grid;
  gap: clamp(34px, 5vw, 62px);
}

.page-faq .faq-group__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-group__head .sec-num,
.page-faq .faq-group__head .sec-title {
  margin: 0;
}

/* ---------- 插图 ---------- */
.page-faq .faq-figure {
  margin: 0 0 clamp(20px, 2.6vw, 30px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, var(--paper), var(--cream));
  overflow: hidden;
}

.page-faq .faq-figure--method {
  border-left: 3px solid var(--milan);
}

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

.page-faq .faq-figure__cap {
  padding: 10px 16px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--gray);
}

/* ---------- 折叠问答 ---------- */
.page-faq .faq-list {
  display: grid;
  gap: 10px;
}

.page-faq .faq-item {
  background: var(--paper);
  border: 1px solid var(--line);
  border-left: 3px solid var(--line);
  border-radius: var(--radius-sm);
  transition: border-color 180ms var(--ease), background-color 180ms var(--ease);
}

.page-faq .faq-item[open] {
  border-left-color: var(--milan);
}

.page-faq .faq-item > summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 12px;
  align-items: baseline;
  padding: 15px 18px;
  cursor: pointer;
  list-style: none;
}

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

.page-faq .faq-item > summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 16px;
  line-height: 1;
  color: var(--milan);
  transition: color 180ms var(--ease);
}

.page-faq .faq-item[open] > summary::after {
  content: "−";
}

.page-faq .faq-num {
  flex: 0 0 auto;
  min-width: 18px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--milan);
}

.page-faq .faq-q {
  margin: 0;
  font-family: var(--font-title);
  font-size: 16px;
  font-weight: 700;
  line-height: 1.55;
  letter-spacing: -0.005em;
  color: var(--ink);
}

.page-faq .faq-a {
  padding: 0 18px 18px 48px;
  font-size: 15px;
  line-height: 1.78;
}

.page-faq .faq-a p {
  margin: 0;
  max-width: 64ch;
}

.page-faq .faq-a a {
  color: var(--milan);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.page-faq .faq-item[open] .faq-a {
  animation: faq-expand 200ms var(--ease) both;
}

@keyframes faq-expand {
  from {
    opacity: 0;
    transform: translateY(-5px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* ---------- 半场分界线 ---------- */
.page-faq .faq-split {
  position: relative;
  height: 1px;
  margin: 0;
  background: var(--line);
}

.page-faq .faq-split::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  width: 8px;
  height: 8px;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: var(--cream);
  transform: translate(-50%, -50%);
}

/* ---------- 末尾联系区块 ---------- */
.page-faq .faq-cta {
  padding: clamp(20px, 3vw, 32px);
  background: var(--paper);
  border: 1px solid var(--line);
  border-left: 3px solid var(--ember);
  border-radius: var(--radius);
}

.page-faq .faq-cta > p {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.8;
  max-width: 60ch;
}

.page-faq .faq-cta .copy-row {
  margin-bottom: 16px;
}

.page-faq .faq-cta__mail {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
  word-break: break-all;
}

.page-faq .faq-cta__more {
  margin: 0;
  font-size: 14px;
}

/* ---------- 桌面端 ---------- */
@media (min-width: 900px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: end;
    gap: clamp(30px, 4vw, 64px);
  }
}

@media (min-width: 960px) {
  .page-faq .faq-body {
    grid-template-columns: minmax(0, var(--faq-idx)) minmax(0, 1fr);
    align-items: start;
  }

  .page-faq .faq-nav {
    position: sticky;
    top: calc(var(--header-h) + 22px);
    max-height: calc(100vh - var(--header-h) - 48px);
    overflow-y: auto;
    overscroll-behavior: contain;
    scrollbar-width: thin;
  }

  .page-faq .faq-nav__list {
    grid-template-columns: 1fr;
  }
}

/* ---------- 窄屏 ---------- */
@media (max-width: 599px) {
  .page-faq .faq-hero::after {
    bottom: -58%;
    opacity: 0.55;
  }

  .page-faq .faq-q {
    font-size: 15.5px;
  }

  .page-faq .faq-a {
    padding-left: 42px;
  }

  .page-faq .faq-item > summary {
    padding: 14px 15px;
  }
}

@media (max-width: 420px) {
  .page-faq .faq-nav__list {
    grid-template-columns: 1fr;
  }
}

/* ---------- 动效克制 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item[open] .faq-a {
    animation: none;
  }

  .page-faq .faq-nav__link,
  .page-faq .faq-item,
  .page-faq .faq-item > summary::after {
    transition: none;
  }
}
<<<END>>>