.page-faq {
  --faq-line: rgba(239, 230, 214, 0.16);
  --faq-line-strong: rgba(239, 230, 214, 0.34);
  --faq-ink: #3A1512;
  --faq-ink-soft: rgba(58, 21, 18, 0.62);
  padding-bottom: 4.5rem;
}

.page-faq a:focus-visible,
.page-faq summary:focus-visible,
.page-faq button:focus-visible {
  outline: 2px solid var(--ochre);
  outline-offset: 2px;
}

/* 面包屑 */
.page-faq .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  padding-top: 1.5rem;
  font-size: 0.82rem;
  color: var(--fg-mute);
}

.page-faq .breadcrumb__item {
  text-decoration: none;
  color: inherit;
}

.page-faq .breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  margin-right: 0.6rem;
  color: var(--slate);
}

.page-faq a.breadcrumb__item:hover {
  color: var(--snow);
}

/* 首屏 */
.page-faq .faq-hero {
  display: grid;
  gap: 2rem;
  padding: 2rem 0 0.5rem;
}

.page-faq .faq-hero h1 {
  margin: 0.9rem 0 0;
  font-family: var(--font-head);
  font-size: clamp(1.75rem, 7vw, 3.25rem);
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--snow);
}

.page-faq .faq-hero__lede {
  max-width: 44ch;
  margin: 1.1rem 0 1.6rem;
  font-size: 1.0625rem;
  line-height: 1.78;
  letter-spacing: 0.01em;
  color: rgba(247, 244, 237, 0.82);
}

.page-faq .faq-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 0.6rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-hero__meta li {
  padding: 0.4rem 0.7rem;
  border: 1px solid var(--faq-line);
  border-radius: var(--radius);
  font-size: 0.8rem;
  color: var(--fg-mute);
}

.page-faq .faq-hero__meta .mono {
  color: var(--snow);
}

.page-faq .faq-hero__media {
  margin: 0;
  border: 1px solid var(--faq-line);
  border-left: 6px solid var(--milan-red);
  background: var(--obsidian-soft);
  overflow: hidden;
}

.page-faq .faq-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

/* 主体双栏 */
.page-faq .faq-body {
  display: grid;
  gap: 1.75rem;
  margin-top: 2.75rem;
}

/* 左侧步骤索引 */
.page-faq .faq-index {
  padding-top: 1.1rem;
  border-top: 1px solid var(--faq-line);
}

.page-faq .faq-index__title {
  margin: 0 0 0.85rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ochre);
}

.page-faq .faq-index__list {
  display: grid;
  gap: 0.15rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-index__link {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  padding: 0.45rem 0.5rem 0.45rem 0.7rem;
  border-left: 2px solid transparent;
  font-size: 0.88rem;
  line-height: 1.5;
  color: var(--fg-mute);
  text-decoration: none;
  transition: color 180ms var(--ease-stand), border-color 180ms var(--ease-stand);
}

.page-faq .faq-index__link .mono {
  font-size: 0.78rem;
  color: var(--slate);
  transition: color 180ms var(--ease-stand);
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  color: var(--snow);
  border-left-color: var(--milan-red);
}

.page-faq .faq-index__link:hover .mono,
.page-faq .faq-index__link:focus-visible .mono {
  color: var(--milan-red);
}

/* 步骤手风琴 */
.page-faq .faq-steps {
  display: grid;
  gap: 1rem;
}

.page-faq .faq-steps__title {
  margin: 0 0 0.25rem;
  font-family: var(--font-head);
  font-size: 1.15rem;
  letter-spacing: -0.01em;
  color: var(--snow);
}

.page-faq .faq-step {
  border: 1px solid var(--faq-ink);
  border-left: 6px solid transparent;
  border-radius: var(--radius);
  background: var(--stand-paper);
  color: var(--faq-ink);
  box-shadow: 5px 5px 0 rgba(0, 0, 0, 0.5);
  overflow: hidden;
  transition: border-left-color 200ms var(--ease-stand);
}

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

.page-faq .faq-step__summary {
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
  padding: 1rem 1.1rem;
  cursor: pointer;
  list-style: none;
}

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

.page-faq .faq-step__summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 1.15rem;
  line-height: 1;
  color: var(--faq-ink-soft);
}

.page-faq .faq-step[open] .faq-step__summary::after {
  content: "\2013";
  color: var(--milan-red);
}

.page-faq .faq-step__num {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--milan-red);
}

.page-faq .faq-step__title {
  font-family: var(--font-head);
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.4;
}

.page-faq .faq-step__hint {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  white-space: nowrap;
  color: var(--faq-ink-soft);
}

.page-faq .faq-step__body {
  display: grid;
  gap: 1.1rem;
  padding: 0 1.1rem 1.3rem;
}

.page-faq .faq-step__text p {
  max-width: 42ch;
  margin: 0 0 0.85rem;
  font-size: 0.97rem;
  line-height: 1.78;
  letter-spacing: 0.01em;
  color: var(--faq-ink);
}

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

.page-faq .faq-step__text ul,
.page-faq .faq-step__text ol {
  margin: 0 0 0.85rem;
  padding-left: 1.15rem;
}

.page-faq .faq-step__text li {
  margin-bottom: 0.4rem;
  font-size: 0.95rem;
  line-height: 1.72;
}

.page-faq .faq-step__text strong {
  color: var(--milan-red);
}

.page-faq .faq-step__text a {
  color: var(--lapis);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-faq .faq-step__text a:hover {
  color: var(--milan-red);
}

/* 结果示意 */
.page-faq .faq-step__result {
  align-self: start;
  padding: 0.85rem 0.95rem;
  border: 1px solid var(--faq-ink);
  background: var(--stand-paper-deep);
}

.page-faq .faq-step__result-label {
  margin: 0 0 0.45rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--milan-red);
}

.page-faq .faq-step__result p:last-child {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--faq-ink);
}

/* 图表配图 */
.page-faq .faq-step__figure {
  margin: 0;
  border: 1px solid var(--faq-ink);
  overflow: hidden;
}

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

/* 指标分段切换 */
.page-faq .faq-metrics {
  padding: 0.9rem;
  border: 1px solid var(--faq-ink);
  background: rgba(31, 63, 160, 0.07);
}

.page-faq .faq-metrics .segmented {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.85rem;
}

.page-faq .faq-metrics .segmented__btn {
  padding: 0.35rem 0.85rem;
  border: 1px solid var(--faq-ink);
  border-radius: var(--radius);
  background: transparent;
  font: inherit;
  font-size: 0.85rem;
  color: var(--faq-ink);
  cursor: pointer;
  transition: background 160ms var(--ease-stand), color 160ms var(--ease-stand);
}

.page-faq .faq-metrics .segmented__btn[aria-selected="true"] {
  background: var(--milan-red);
  border-color: var(--milan-red);
  color: var(--snow);
}

.page-faq .faq-metric__label {
  margin: 0 0 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--lapis);
}

.page-faq .faq-metric p:last-child {
  margin: 0;
  max-width: 42ch;
  font-size: 0.93rem;
  line-height: 1.72;
  color: var(--faq-ink);
}

/* 刷新周期对照条 */
.page-faq .faq-cycles {
  display: grid;
  gap: 0.75rem;
  padding: 0.9rem;
  border: 1px dashed rgba(58, 21, 18, 0.4);
}

.page-faq .faq-cycle {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 4rem;
  grid-template-areas:
    "label label"
    "bar value";
  align-items: center;
  gap: 0.35rem 0.7rem;
}

.page-faq .faq-cycle__label {
  grid-area: label;
  font-size: 0.85rem;
  color: var(--faq-ink);
}

.page-faq .faq-cycle__bar {
  grid-area: bar;
  display: block;
  height: 10px;
  border: 1px solid rgba(58, 21, 18, 0.45);
  background: rgba(58, 21, 18, 0.12);
}

.page-faq .faq-cycle__fill {
  display: block;
  height: 100%;
  background: var(--slate);
}

.page-faq .faq-cycle--mobile .faq-cycle__fill {
  background: var(--milan-red);
}

.page-faq .faq-cycle--chart .faq-cycle__fill {
  background: var(--turquoise);
}

.page-faq .faq-cycle--desktop .faq-cycle__fill {
  background: var(--lapis);
}

.page-faq .faq-cycle__value {
  grid-area: value;
  text-align: right;
  font-size: 0.82rem;
  color: var(--faq-ink);
}

/* 收尾 */
.page-faq .faq-next {
  margin-top: 3rem;
  padding: 1.5rem 1.35rem;
  border: 1px solid var(--faq-line-strong);
  background: var(--obsidian-soft);
}

.page-faq .faq-next__title {
  margin: 0 0 0.7rem;
  font-family: var(--font-head);
  font-size: 1.2rem;
  letter-spacing: -0.01em;
  color: var(--snow);
}

.page-faq .faq-next__lede {
  max-width: 46ch;
  margin: 0 0 1.2rem;
  font-size: 0.95rem;
  line-height: 1.75;
  color: var(--fg-mute);
}

.page-faq .faq-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

/* 展开动效 */
@media (prefers-reduced-motion: no-preference) {
  .page-faq .faq-step[open] .faq-step__body {
    animation: faq-step-open 260ms var(--ease-stand) both;
  }
}

@keyframes faq-step-open {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* 平板及桌面 */
@media (min-width: 720px) {
  .page-faq .faq-cycle {
    grid-template-columns: 7rem minmax(0, 1fr) 4.5rem;
    grid-template-areas: "label bar value";
    gap: 0.7rem;
  }

  .page-faq .faq-step__summary {
    padding: 1.1rem 1.4rem;
  }

  .page-faq .faq-step__body {
    padding: 0 1.4rem 1.5rem;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero {
    grid-template-columns: minmax(0, 1fr) minmax(240px, 360px);
    align-items: start;
    gap: 3rem;
    padding-top: 2.5rem;
  }

  .page-faq .faq-hero__media img {
    aspect-ratio: 9 / 11;
  }

  .page-faq .faq-body {
    grid-template-columns: 210px minmax(0, 1fr);
    gap: 3rem;
    margin-top: 3.5rem;
  }

  .page-faq .faq-index {
    position: sticky;
    top: calc(var(--header-h) + 1.5rem);
    max-height: calc(100vh - var(--header-h) - 3rem);
    padding: 0 0 0 1rem;
    border-top: none;
    border-left: 1px solid var(--faq-line-strong);
    overflow-y: auto;
  }
}

@media (min-width: 1080px) {
  .page-faq .faq-step__body {
    grid-template-columns: minmax(0, 1fr) 15rem;
    align-items: start;
    gap: 1.1rem 1.5rem;
  }

  .page-faq .faq-step__figure,
  .page-faq .faq-metrics,
  .page-faq .faq-cycles {
    grid-column: 1 / -1;
  }
}
<<<END>>>