.page-faq {
  --faq-gap: clamp(14px, 1.8vw, 22px);
  --faq-sticky-top: calc(var(--bar-h) + var(--progress-h) + 20px);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  padding: clamp(26px, 4.4vw, 56px) 0 clamp(34px, 5.5vw, 68px);
  border-bottom: 3px solid var(--acid-400);
}

.page-faq .faq-hero .breadcrumbs,
.page-faq .faq-hero .breadcrumbs a {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--blue-400);
  text-decoration: none;
}

.page-faq .faq-hero .breadcrumbs__current {
  color: var(--acid-400);
}

.page-faq .faq-hero__grid {
  display: grid;
  gap: clamp(26px, 3.4vw, 44px);
  margin-top: clamp(18px, 2.4vw, 30px);
}

.page-faq .faq-hero__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.85rem, 5.4vw, 3.4rem);
  line-height: 1.08;
  letter-spacing: -0.01em;
  color: var(--chalk-50);
  margin: 14px 0 18px;
  max-width: 20ch;
}

.page-faq .faq-hero__lead {
  font-family: var(--font-body);
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.78;
  color: var(--paper-200);
  max-width: 46ch;
  margin: 0 0 24px;
}

.page-faq .faq-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-faq .faq-hero__facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.page-faq .faq-hero__facts > li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 12px;
  background: var(--ink-800);
  border: 3px solid var(--ink-900);
  box-shadow: var(--shadow-acid);
}

.page-faq .faq-hero__factnum {
  font-family: var(--font-mono);
  font-size: clamp(22px, 2.6vw, 30px);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--acid-400);
}

.page-faq .faq-hero__factlab {
  font-size: 12px;
  letter-spacing: 0.06em;
  line-height: 1.5;
  color: var(--paper-200);
}

@media (min-width: 920px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr);
    align-items: end;
    gap: 56px;
  }
}

/* ---------- 主体骨架 ---------- */
.page-faq .faq-body {
  background: var(--paper-50);
  padding: clamp(34px, 4.6vw, 68px) 0 clamp(46px, 6vw, 88px);
}

.page-faq .faq-body__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
}

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

/* ---------- 主题跳转条 ---------- */
.page-faq .faq-topics {
  order: -1;
  min-width: 0;
}

.page-faq .faq-topics__cap {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--blue-400);
  margin: 0 0 10px;
}

.page-faq .faq-topics__list {
  list-style: none;
  margin: 0;
  padding: 0 0 4px;
  display: flex;
  flex-wrap: nowrap;
  gap: 8px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.page-faq .faq-topics__link {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
  border: 2px solid var(--ink-900);
  background: var(--chalk-50);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--ink-900);
  text-decoration: none;
  white-space: nowrap;
  transition: background-color 0.18s var(--ease), color 0.18s var(--ease);
}

.page-faq .faq-topics__link::before {
  content: "";
  flex: 0 0 auto;
  width: 8px;
  height: 8px;
  background: var(--paper-200);
  border: 2px solid var(--ink-900);
  transition: background-color 0.18s var(--ease);
}

.page-faq .faq-topics__link:hover,
.page-faq .faq-topics__link:focus-visible {
  background: var(--acid-200);
  outline: none;
}

.page-faq .faq-topics__link:hover::before,
.page-faq .faq-topics__link:focus-visible::before {
  background: var(--acid-400);
}

@media (min-width: 1080px) {
  .page-faq .faq-body__grid {
    grid-template-columns: minmax(0, 1fr) 206px;
    gap: 52px;
    align-items: start;
  }

  .page-faq .faq-topics {
    order: 0;
    position: sticky;
    top: var(--faq-sticky-top);
    align-self: start;
  }

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

  .page-faq .faq-topics__link {
    width: 100%;
    border: 0;
    border-left: 3px solid var(--paper-200);
    background: transparent;
    padding: 7px 10px;
    white-space: normal;
    line-height: 1.5;
  }

  .page-faq .faq-topics__link::before {
    background: var(--paper-200);
    border-width: 2px;
  }

  .page-faq .faq-topics__link:hover,
  .page-faq .faq-topics__link:focus-visible {
    background: var(--acid-200);
    border-left-color: var(--ink-900);
  }
}

/* ---------- 章节头 ---------- */
.page-faq .faq-block + .faq-block {
  margin-top: clamp(40px, 5vw, 76px);
}

.page-faq .faq-block__head {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding-bottom: 14px;
  margin-bottom: 20px;
  border-bottom: 3px solid var(--ink-900);
}

.page-faq .faq-block__idx {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  line-height: 1;
  padding: 5px 7px;
  background: var(--ink-900);
  color: var(--acid-400);
}

.page-faq .faq-block__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.3rem, 2.6vw, 1.9rem);
  line-height: 1.2;
  letter-spacing: -0.005em;
  color: var(--ink-900);
  margin: 0 0 6px;
}

.page-faq .faq-block__sub {
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-800);
  margin: 0;
  max-width: 62ch;
}

/* ---------- 上手三步 ---------- */
.page-faq .faq-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-faq .faq-steps__item {
  position: relative;
  z-index: 1;
  padding: 16px 16px 18px;
  background: var(--chalk-50);
  border: 3px solid var(--ink-900);
  box-shadow: var(--shadow-1);
  transition: transform 0.18s var(--ease), box-shadow 0.18s var(--ease);
}

.page-faq .faq-steps__item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-2);
}

.page-faq .faq-steps__num {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
  padding: 2px 7px;
  margin-bottom: 12px;
  background: var(--acid-400);
  border: 2px solid var(--ink-900);
  color: var(--ink-950);
}

.page-faq .faq-steps__title {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 900;
  line-height: 1.4;
  color: var(--ink-900);
  margin: 0 0 8px;
}

.page-faq .faq-steps__desc {
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-800);
  margin: 0;
}

@media (min-width: 780px) {
  .page-faq .faq-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }

  .page-faq .faq-steps__item + .faq-steps__item::before {
    content: "";
    position: absolute;
    left: -23px;
    top: 32px;
    width: 20px;
    height: 3px;
    background: var(--blue-400);
  }
}

/* ---------- 配图 ---------- */
.page-faq .faq-figure {
  margin: 0 0 22px;
  border: 3px solid var(--ink-900);
  background: var(--chalk-50);
  box-shadow: var(--shadow-1);
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  aspect-ratio: 12 / 7;
}

.page-faq .faq-figure figcaption {
  padding: 10px 12px;
  border-top: 3px solid var(--ink-900);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.65;
  color: var(--ink-800);
}

/* ---------- 问答网格 ---------- */
.page-faq .faq-grid {
  columns: 1;
  column-gap: var(--faq-gap);
}

@media (min-width: 780px) {
  .page-faq .faq-grid {
    columns: 2;
  }
}

.page-faq .qa {
  break-inside: avoid;
  margin: 0 0 var(--faq-gap);
  background: var(--chalk-50);
  border: 3px solid var(--ink-900);
  box-shadow: var(--shadow-1);
  transition: box-shadow 0.2s var(--ease);
}

.page-faq .qa[open] {
  box-shadow: var(--shadow-2);
}

.page-faq .qa__head {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 13px 14px;
  cursor: pointer;
  list-style: none;
  -webkit-tap-highlight-color: transparent;
}

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

.page-faq .qa__head:focus-visible {
  outline: 3px solid var(--acid-400);
  outline-offset: -6px;
}

.page-faq .qa__num {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.04em;
  line-height: 1.5;
  padding: 1px 5px;
  background: var(--acid-400);
  border: 2px solid var(--ink-900);
  color: var(--ink-950);
}

.page-faq .qa__q {
  flex: 1 1 auto;
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 700;
  line-height: 1.55;
  color: var(--ink-900);
}

.page-faq .qa__ico {
  flex: 0 0 auto;
  position: relative;
  width: 16px;
  height: 16px;
  margin-top: 4px;
}

.page-faq .qa__ico::before,
.page-faq .qa__ico::after {
  content: "";
  position: absolute;
  background: var(--ink-900);
  transition: transform 0.2s var(--ease), opacity 0.2s var(--ease);
}

.page-faq .qa__ico::before {
  left: 0;
  right: 0;
  top: 50%;
  height: 3px;
  transform: translateY(-50%);
}

.page-faq .qa__ico::after {
  top: 0;
  bottom: 0;
  left: 50%;
  width: 3px;
  transform: translateX(-50%);
}

.page-faq .qa[open] .qa__ico::after {
  opacity: 0;
  transform: translateX(-50%) scaleY(0);
}

.page-faq .qa__body {
  margin: 0 14px 14px;
  padding: 12px 14px;
  background: var(--paper-50);
  border-left: 3px solid var(--acid-400);
  font-family: var(--font-body);
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--ink-900);
}

.page-faq .qa[open] .qa__body {
  animation: faq-answer-in 0.22s var(--ease);
}

@keyframes faq-answer-in {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.page-faq .qa__body p {
  margin: 0;
}

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

.page-faq .qa__body a {
  color: var(--ink-900);
  text-decoration: underline;
  text-decoration-color: var(--acid-400);
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}

/* ---------- 收尾 ---------- */
.page-faq .faq-cta {
  padding: clamp(38px, 5vw, 76px) 0;
  border-top: 3px solid var(--acid-400);
}

.page-faq .faq-cta__inner {
  display: grid;
  gap: 24px;
}

.page-faq .faq-cta__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.5rem, 3.4vw, 2.4rem);
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: var(--chalk-50);
  margin: 12px 0 12px;
  max-width: 22ch;
}

.page-faq .faq-cta__text {
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.78;
  color: var(--paper-200);
  margin: 0;
  max-width: 56ch;
}

.page-faq .faq-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

@media (min-width: 860px) {
  .page-faq .faq-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 48px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa__body,
  .page-faq .qa[open] .qa__body {
    animation: none;
  }

  .page-faq .faq-steps__item:hover {
    transform: none;
  }
}
<<<END>>>