.page-faq {
  --faq-rail: 13.5rem;
  --faq-measure: 42rem;
  --faq-block: clamp(48px, 7vw, 88px);
}

/* ── 首屏 ───────────────────────────────────────── */
.page-faq .faq-hero {
  max-width: 48rem;
  padding-block: clamp(36px, 7vw, 88px) clamp(28px, 4vw, 48px);
}

.page-faq .faq-hero h1 {
  margin: 0 0 20px;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(30px, 5.4vw, 56px);
  line-height: 1.18;
  letter-spacing: -0.01em;
  color: var(--chalk);
  overflow-wrap: break-word;
}

.page-faq .faq-hero .lede {
  margin: 0;
  max-width: 38ch;
}

.page-faq .faq-hero__marks {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 40px;
  margin: 40px 0 0;
  padding: 20px 0 0;
  list-style: none;
  border-top: 1px solid var(--hairline);
}

.page-faq .faq-hero__mark {
  display: flex;
  align-items: baseline;
  gap: 8px;
  font-size: var(--fs-14);
  color: var(--mist);
}

.page-faq .faq-hero__mark .num {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  color: var(--lime-signal);
  line-height: 1;
}

/* ── 骨架：内容 + 目录 ──────────────────────────── */
.page-faq .faq-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
  padding-bottom: clamp(64px, 9vw, 120px);
}

@media (min-width: 980px) {
  .page-faq .faq-shell {
    grid-template-columns: var(--faq-rail) minmax(0, 1fr);
    gap: clamp(48px, 6vw, 96px);
    align-items: start;
  }
}

.page-faq .faq-toc {
  position: static;
}

@media (min-width: 980px) {
  .page-faq .faq-toc {
    position: sticky;
    top: calc(var(--header-h) + 32px);
    padding-top: 12px;
  }
}

.page-faq .faq-toc__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-faq .faq-toc__list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
}

@media (min-width: 980px) {
  .page-faq .faq-toc__list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 0;
  }
}

.page-faq .faq-toc__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 7px 12px;
  border-left: 2px solid transparent;
  font-size: var(--fs-14);
  color: var(--mist);
  text-decoration: none;
  transition: color 160ms ease, border-color 160ms ease, background-color 160ms ease;
}

.page-faq .faq-toc__link .num {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  color: var(--pitch-line);
}

.page-faq .faq-toc__link:hover,
.page-faq .faq-toc__link:focus-visible {
  color: var(--chalk);
  background: var(--ink-panel);
  border-left-color: var(--lime-signal);
}

.page-faq .faq-toc__link:hover .num,
.page-faq .faq-toc__link:focus-visible .num {
  color: var(--lime-signal);
}

.page-faq .faq-main {
  max-width: var(--faq-measure);
}

/* ── 章节通用 ───────────────────────────────────── */
.page-faq .faq-section {
  padding-block: var(--faq-block);
  border-top: 1px solid var(--hairline);
}

.page-faq .faq-section:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-faq .faq-section__title {
  margin: 14px 0 18px;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(24px, 3.4vw, 36px);
  line-height: 1.28;
  letter-spacing: -0.01em;
  color: var(--chalk);
}

.page-faq .faq-section__conclusion {
  position: relative;
  margin: 0 0 24px;
  padding-left: 18px;
  font-size: var(--fs-16);
  line-height: 1.7;
  color: var(--chalk);
}

.page-faq .faq-section__conclusion::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 8px;
  height: 8px;
  background: var(--lime-signal);
}

.page-faq .faq-section .prose + .prose {
  margin-top: 16px;
}

.page-faq .faq-section__next {
  margin: 32px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--hairline);
  font-size: var(--fs-14);
  line-height: 1.7;
  color: var(--mist);
}

.page-faq .faq-section__next a {
  color: var(--lime-soft);
  text-underline-offset: 4px;
}

.page-faq .faq-section__next a:hover,
.page-faq .faq-section__next a:focus-visible {
  color: var(--lime-signal);
}

.page-faq .media-frame {
  margin: 36px 0;
}

.page-faq .media-frame img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
  filter: saturate(0.55) contrast(1.05);
}

/* ── 三分钟上手：步骤条 ─────────────────────────── */
.page-faq .start-steps {
  display: grid;
  gap: 1px;
  margin: 36px 0 0;
  padding: 0;
  list-style: none;
  background: var(--hairline);
  border: 1px solid var(--hairline);
}

.page-faq .start-steps__item {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 16px;
  padding: 20px 18px;
  background: var(--ink-base);
  transition: background-color 180ms ease;
}

.page-faq .start-steps__item:hover {
  background: var(--ink-panel);
}

.page-faq .start-steps__idx {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  color: var(--lime-signal);
  line-height: 1.5;
  border-right: 1px solid var(--pitch-line);
}

.page-faq .start-steps__label {
  margin: 0 0 6px;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: var(--fs-16);
  color: var(--chalk);
}

.page-faq .start-steps__item p:last-child {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--mist);
}

/* ── 检索分段切换 ───────────────────────────────── */
.page-faq .retrieval-tabs {
  margin-top: 32px;
}

.page-faq .retrieval-tabs__list {
  display: flex;
  gap: 0;
  overflow-x: auto;
  border-bottom: 1px solid var(--hairline-strong);
  scrollbar-width: thin;
}

.page-faq .retrieval-tabs__tab {
  flex: 0 0 auto;
  appearance: none;
  background: transparent;
  border: 0;
  border-bottom: 2px solid transparent;
  padding: 12px 16px;
  font-family: var(--font-sans);
  font-size: var(--fs-14);
  color: var(--mist);
  white-space: nowrap;
  cursor: pointer;
  transition: color 160ms ease, border-color 160ms ease;
}

.page-faq .retrieval-tabs__tab .num {
  font-family: var(--font-mono);
  margin-right: 4px;
  color: var(--pitch-line);
}

.page-faq .retrieval-tabs__tab:hover {
  color: var(--chalk);
}

.page-faq .retrieval-tabs__tab[aria-selected="true"] {
  color: var(--lime-signal);
  border-bottom-color: var(--lime-signal);
}

.page-faq .retrieval-tabs__tab[aria-selected="true"] .num {
  color: var(--lime-signal);
}

.page-faq .retrieval-tabs__tab:focus-visible {
  outline: 2px solid var(--lime-signal);
  outline-offset: -2px;
}

.page-faq .retrieval-tabs__panel {
  padding-top: 24px;
}

.page-faq .retrieval-tabs__panel[hidden] {
  display: none;
}

.page-faq .retrieval-tabs__lead {
  margin: 0 0 16px;
  font-size: var(--fs-16);
  line-height: 1.7;
  color: var(--chalk);
}

.page-faq .retrieval-steps {
  margin: 0;
  padding-left: 20px;
  display: grid;
  gap: 8px;
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--mist);
}

.page-faq .retrieval-steps li::marker {
  font-family: var(--font-mono);
  color: var(--lime-signal);
}

.page-faq .retrieval-tabs__hint {
  margin: 20px 0 0;
  padding: 12px 14px;
  border-left: 2px solid var(--amber-pulse);
  background: var(--ink-panel);
  font-size: var(--fs-14);
  line-height: 1.7;
  color: var(--mist);
}

/* ── 更新时点 ───────────────────────────────────── */
.page-faq .update-timeline {
  position: relative;
  margin: 36px 0 0;
  padding: 0 0 0 26px;
  list-style: none;
  border-left: 1px solid var(--pitch-line);
}

.page-faq .update-timeline__item {
  position: relative;
  padding-bottom: 36px;
}

.page-faq .update-timeline__item:last-child {
  padding-bottom: 0;
}

.page-faq .update-timeline__item::before {
  content: "";
  position: absolute;
  left: -31px;
  top: 7px;
  width: 9px;
  height: 9px;
  background: var(--ink-base);
  border: 1px solid var(--pitch-line);
  transition: background-color 200ms ease, border-color 200ms ease, box-shadow 200ms ease;
}

.page-faq .update-timeline__item:hover::before,
.page-faq .update-timeline__item:focus-within::before {
  background: var(--lime-signal);
  border-color: var(--lime-signal);
  box-shadow: 0 0 0 5px rgba(198, 240, 60, 0.12);
}

.page-faq .update-timeline__time {
  display: inline-block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.06em;
  color: var(--lime-soft);
  background: rgba(228, 255, 154, 0.08);
  padding: 3px 8px;
}

.page-faq .update-timeline__item:hover .update-timeline__time {
  color: var(--ink-base);
  background: var(--lime-soft);
}

.page-faq .update-timeline__title {
  margin: 0 0 6px;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: var(--fs-16);
  color: var(--chalk);
}

.page-faq .update-timeline__body p:last-child {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--mist);
}

/* ── 折叠问答 ───────────────────────────────────── */
.page-faq .faq-list {
  margin-top: 28px;
  border-top: 1px solid var(--hairline);
}

.page-faq .faq-item {
  border-bottom: 1px solid var(--hairline);
}

.page-faq .faq-item__q {
  position: relative;
  display: block;
  padding: 20px 44px 20px 0;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: var(--fs-16);
  line-height: 1.6;
  color: var(--chalk);
  cursor: pointer;
  list-style: none;
  transition: color 160ms ease;
}

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

.page-faq .faq-item__q::after {
  content: "+";
  position: absolute;
  right: 8px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 20px;
  color: var(--lime-signal);
  transition: transform 200ms ease;
}

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

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

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

.page-faq .faq-item__a {
  padding: 0 44px 24px 0;
}

.page-faq .faq-item__a p {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--mist);
}

.page-faq .faq-item__a a {
  color: var(--lime-soft);
  text-underline-offset: 4px;
}

/* ── 收尾 ───────────────────────────────────────── */
.page-faq .faq-outro {
  margin-top: var(--faq-block);
  padding: 32px 24px;
  background: var(--ink-panel);
  border-left: 3px solid var(--lime-signal);
}

.page-faq .faq-outro__lead {
  margin: 0 0 10px;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: var(--fs-26);
  line-height: 1.35;
  color: var(--chalk);
}

.page-faq .faq-outro .prose {
  margin: 0;
  color: var(--mist);
  font-size: var(--fs-14);
}

.page-faq .faq-outro .num {
  font-family: var(--font-mono);
  color: var(--chalk);
}

/* ── 窄屏兜底 ───────────────────────────────────── */
@media (max-width: 640px) {
  .page-faq .faq-hero__marks {
    gap: 14px 24px;
  }

  .page-faq .faq-hero__mark {
    flex: 1 1 40%;
  }

  .page-faq .start-steps__item {
    grid-template-columns: 32px minmax(0, 1fr);
    gap: 12px;
    padding: 18px 14px;
  }

  .page-faq .start-steps__idx {
    font-size: var(--fs-16);
  }

  .page-faq .update-timeline {
    padding-left: 20px;
  }

  .page-faq .update-timeline__item::before {
    left: -26px;
  }

  .page-faq .faq-item__q {
    padding-right: 36px;
  }

  .page-faq .faq-item__a {
    padding-right: 12px;
  }

  .page-faq .faq-outro {
    padding: 24px 18px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-toc__link,
  .page-faq .start-steps__item,
  .page-faq .retrieval-tabs__tab,
  .page-faq .update-timeline__item::before,
  .page-faq .update-timeline__time,
  .page-faq .faq-item__q,
  .page-faq .faq-item__q::after {
    transition: none;
  }
}