.page-faq {
  --faq-cut: 18px;
  --faq-rail: 280px;
  background: var(--paper);
  color: var(--char);
  font-family: var(--font-body);
}

.page-faq .faq-shell {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(18px, 3vw, 32px) clamp(34px, 6vw, 68px);
  color: var(--paper);
  background:
    radial-gradient(120% 95% at 88% 0%, rgba(38, 224, 214, 0.18), transparent 62%),
    linear-gradient(168deg, var(--ink) 0%, var(--ink) 58%, var(--ink-2) 100%);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(90deg, rgba(201, 191, 169, 0.13) 0 1px, transparent 1px 96px);
}

.page-faq .faq-hero__inner {
  position: relative;
}

.page-faq .breadcrumb {
  margin-bottom: clamp(20px, 3vw, 34px);
}

.page-faq .breadcrumb__item {
  color: rgba(244, 238, 226, 0.62);
  font-size: 12px;
  letter-spacing: 0.12em;
}

.page-faq .breadcrumb__link {
  color: var(--mist);
  text-decoration: none;
}

.page-faq .breadcrumb__link:hover {
  color: var(--signal);
}

.page-faq .faq-hero__grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  align-items: start;
}

.page-faq .faq-hero__kicker {
  margin: 0 0 14px;
  color: var(--sand);
}

.page-faq .faq-hero h1 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(28px, 6vw, 54px);
  font-weight: 900;
  line-height: 1.14;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-faq .faq-hero__lede {
  margin: 18px 0 0;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.78;
  color: rgba(244, 238, 226, 0.8);
}

.page-faq .faq-stats {
  list-style: none;
  margin: clamp(24px, 4vw, 34px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  border: 1px solid rgba(201, 191, 169, 0.28);
  background: rgba(201, 191, 169, 0.28);
}

.page-faq .faq-stats li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 13px 15px;
  background: var(--ink);
}

.page-faq .faq-stats__num {
  font-family: var(--font-mono);
  font-size: clamp(22px, 3.4vw, 28px);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
  color: var(--signal);
}

.page-faq .faq-stats__unit {
  margin-left: 2px;
  font-size: 13px;
  font-weight: 500;
}

.page-faq .faq-stats__key {
  font-size: 12px;
  line-height: 1.5;
  letter-spacing: 0.06em;
  color: rgba(244, 238, 226, 0.66);
}

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

.page-faq .faq-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  border: 1px solid rgba(201, 191, 169, 0.34);
  background: var(--ink-2);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 0 100%);
}

/* ---------- 主体栅格 ---------- */
.page-faq .faq-body {
  display: grid;
  gap: clamp(28px, 4vw, 48px);
  padding-block: clamp(28px, 5vw, 62px) clamp(40px, 6vw, 84px);
}

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

/* ---------- 章节 ---------- */
.page-faq .faq-sec {
  margin-bottom: clamp(30px, 5vw, 54px);
}

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

.page-faq .faq-sec__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding-top: 13px;
  border-top: 2px solid var(--sand);
}

.page-faq .faq-sec__num {
  font-family: var(--font-mono);
  font-size: 13px;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.12em;
  color: var(--sand);
}

.page-faq .faq-sec__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(21px, 3.2vw, 30px);
  font-weight: 800;
  line-height: 1.3;
  color: var(--char);
}

.page-faq .faq-sec__lede {
  margin: 12px 0 20px;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 问题索引 ---------- */
.page-faq .faq-index {
  display: grid;
  gap: 22px;
}

.page-faq .faq-index__group-title {
  margin: 0 0 8px;
  padding-left: 10px;
  border-left: 3px solid var(--signal);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--ink);
}

.page-faq .faq-index__list {
  list-style: none;
  counter-reset: faqq;
  margin: 0;
  padding: 0;
}

.page-faq .faq-index__list li {
  counter-increment: faqq;
  border-bottom: 1px solid var(--rule);
}

.page-faq .faq-index__list a {
  position: relative;
  display: block;
  padding: 9px 0 9px 30px;
  font-size: 15px;
  line-height: 1.55;
  color: var(--char);
  text-decoration: none;
  transition: color 0.18s var(--ease), padding-left 0.18s var(--ease);
}

.page-faq .faq-index__list a::before {
  content: counter(faqq, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 11px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--sand);
}

.page-faq .faq-index__list a:hover {
  padding-left: 34px;
  color: var(--ink);
}

/* ---------- 手风琴 ---------- */
.page-faq .faq-item {
  position: relative;
  margin-bottom: 10px;
  background: rgba(231, 222, 203, 0.32);
  border: 1px solid var(--rule);
  clip-path: polygon(0 0, calc(100% - var(--faq-cut)) 0, 100% var(--faq-cut), 100% 100%, 0 100%);
  transition: background 0.18s var(--ease);
}

.page-faq .faq-item:hover {
  background: rgba(231, 222, 203, 0.62);
}

.page-faq .faq-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--signal);
  transform: scaleY(0);
  transform-origin: top center;
  transition: transform 0.22s var(--ease);
}

.page-faq .faq-item[open]::before {
  transform: scaleY(1);
}

.page-faq .faq-item__q {
  display: block;
  position: relative;
  padding: 15px 44px 15px 18px;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.6;
  color: var(--char);
  cursor: pointer;
  list-style: none;
}

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

.page-faq .faq-item__q::after {
  content: "+";
  position: absolute;
  right: 16px;
  top: 13px;
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 500;
  line-height: 1.4;
  color: var(--ink-2);
}

.page-faq .faq-item[open] .faq-item__q::after {
  content: "–";
  color: var(--signal);
}

.page-faq .faq-item__q:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: -3px;
}

.page-faq .faq-item__a {
  padding: 0 20px 16px 21px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--char);
}

.page-faq .faq-item__a p {
  margin: 0 0 8px;
}

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

.page-faq .faq-item__a a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--signal);
}

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

.page-faq .faq-item:target .faq-item__q {
  background: rgba(38, 224, 214, 0.14);
}

/* 关键数字 */
.page-faq .faq-num {
  position: relative;
  font-family: var(--font-mono);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--ink);
  border-bottom: 1px dashed var(--sand);
  padding-bottom: 1px;
}

.page-faq .faq-num::after {
  content: attr(data-note);
  position: absolute;
  left: 0;
  bottom: calc(100% + 8px);
  width: max-content;
  max-width: min(240px, 62vw);
  padding: 5px 9px;
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 400;
  line-height: 1.5;
  letter-spacing: 0.04em;
  color: var(--mist);
  background: var(--ink);
  border-left: 2px solid var(--signal);
  opacity: 0;
  transform: translateY(4px);
  transition: opacity 0.18s var(--ease), transform 0.18s var(--ease);
  pointer-events: none;
  z-index: 3;
}

.page-faq .faq-num:hover::after {
  opacity: 1;
  transform: translateY(0);
}

/* 插图 */
.page-faq .faq-figure {
  margin: 0 0 20px;
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  border: 1px solid var(--rule);
  object-fit: cover;
}

.page-faq .faq-figure figcaption {
  margin-top: 8px;
  font-size: 12px;
  letter-spacing: 0.12em;
  line-height: 1.6;
  color: var(--muted);
}

/* 深底收尾章节 */
.page-faq .faq-sec--ink {
  padding: clamp(20px, 3vw, 32px);
  background: var(--ink);
  border-top: 2px solid var(--signal);
}

.page-faq .faq-sec--ink .faq-sec__head {
  border-top-color: var(--signal);
}

.page-faq .faq-sec--ink .faq-sec__title {
  color: var(--paper);
}

.page-faq .faq-sec--ink .faq-sec__num {
  color: var(--signal);
}

.page-faq .faq-sec--ink .faq-sec__lede {
  color: rgba(244, 238, 226, 0.74);
}

.page-faq .faq-sec--ink .faq-item {
  background: var(--ink-2);
  border-color: rgba(201, 191, 169, 0.3);
}

.page-faq .faq-sec--ink .faq-item:hover {
  background: rgba(38, 224, 214, 0.1);
}

.page-faq .faq-sec--ink .faq-item__q,
.page-faq .faq-sec--ink .faq-item__a {
  color: var(--paper);
}

.page-faq .faq-sec--ink .faq-item__q::after {
  color: var(--mist);
}

.page-faq .faq-sec--ink .faq-item__a a {
  color: var(--mist);
  border-bottom-color: rgba(38, 224, 214, 0.7);
}

.page-faq .faq-sec--ink .faq-num {
  color: var(--mist);
  border-bottom-color: var(--signal);
}

.page-faq .faq-sec--ink .faq-num::after {
  background: var(--paper);
  color: var(--ink);
  border-left-color: var(--coral);
}

.page-faq .faq-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 22px 0 0;
}

.page-faq .faq-cta__ghost {
  color: var(--paper);
  border-color: rgba(244, 238, 226, 0.4);
}

/* ---------- 侧栏索引 ---------- */
.page-faq .faq-rail {
  padding-top: 18px;
  border-top: 1px solid var(--rule);
}

.page-faq .faq-rail__title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--ink);
}

.page-faq .chapter-nav {
  display: grid;
}

.page-faq .chapter-nav__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 0 9px 10px;
  border-left: 3px solid transparent;
  border-bottom: 1px dashed var(--rule);
  font-size: 14px;
  line-height: 1.5;
  color: var(--muted);
  text-decoration: none;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-faq .chapter-nav__link:hover {
  color: var(--ink);
  border-left-color: var(--sand);
}

.page-faq .chapter-nav__link.is-current {
  color: var(--ink);
  font-weight: 700;
  border-left-color: var(--signal);
}

.page-faq .faq-rail__num {
  font-family: var(--font-mono);
  font-size: 12px;
  font-variant-numeric: tabular-nums;
  color: var(--sand);
}

.page-faq .faq-rail__note {
  margin-top: 22px;
  padding: 14px 16px;
  background: rgba(231, 222, 203, 0.55);
  border-left: 3px solid var(--sand);
}

.page-faq .faq-rail__note p {
  margin: 0 0 8px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--char);
}

.page-faq .faq-rail__note .annotation {
  color: var(--muted);
  margin-bottom: 6px;
}

.page-faq .faq-rail__link {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--coral);
}

.page-faq .faq-rail__link:hover {
  color: var(--coral);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-faq .faq-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-faq .faq-item__q {
    padding: 16px 48px 16px 22px;
    font-size: 16px;
  }

  .page-faq .faq-item__a {
    padding: 0 24px 18px 25px;
  }

  .page-faq .faq-index {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px 32px;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: center;
  }

  .page-faq .faq-figure img {
    max-height: 340px;
  }
}

@media (min-width: 1040px) {
  .page-faq .faq-body {
    grid-template-columns: minmax(0, 1fr) var(--faq-rail);
    align-items: start;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: calc(var(--bar-h) + 20px);
    padding-top: 14px;
    padding-left: 20px;
    border-top: 0;
    border-left: 1px solid var(--rule);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item,
  .page-faq .faq-item::before,
  .page-faq .faq-num::after,
  .page-faq .faq-index__list a,
  .page-faq .chapter-nav__link {
    transition: none;
  }
}
<<<END>>>