.page-faq {
  --faq-soft: rgba(244, 241, 232, 0.78);
  --faq-faint: rgba(244, 241, 232, 0.56);
  --faq-ink-soft: rgba(11, 26, 43, 0.84);
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
}

.page-faq .mono {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
}

/* 首屏 */
.page-faq .faq-hero {
  position: relative;
  padding: clamp(20px, 4vw, 40px) 0 clamp(30px, 5vw, 64px);
  background-image:
    linear-gradient(90deg, rgba(154, 167, 180, 0.1) 1px, transparent 1px),
    linear-gradient(0deg, rgba(154, 167, 180, 0.1) 1px, transparent 1px),
    radial-gradient(120% 90% at 88% -10%, rgba(255, 106, 43, 0.16), transparent 62%);
  background-size: 88px 88px, 88px 88px, 100% 100%;
  border-bottom: 1px solid var(--line);
}

.page-faq .crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--rock);
  margin-bottom: clamp(18px, 3vw, 34px);
}

.page-faq .crumb a {
  color: var(--rock);
  text-decoration: none;
}

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

.page-faq .crumb__sep {
  color: var(--line-strong);
}

.page-faq .faq-hero__grid {
  display: grid;
  gap: clamp(22px, 3.6vw, 44px);
}

.page-faq .faq-kicker {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--signal);
  text-transform: uppercase;
}

.page-faq h1 {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(28px, 6.4vw, 54px);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--paper);
  max-width: 18em;
}

.page-faq .faq-lead {
  margin: clamp(14px, 2vw, 20px) 0 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--faq-soft);
  max-width: 34em;
}

.page-faq .faq-facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 14px clamp(14px, 2vw, 24px);
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 16px 0 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-faq .faq-facts li {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-faq .faq-facts b {
  font-family: var(--font-head);
  font-size: clamp(22px, 3.4vw, 30px);
  font-weight: 800;
  line-height: 1;
  color: var(--signal-soft);
}

.page-faq .faq-facts span {
  font-family: var(--font-ui);
  font-size: 13px;
  line-height: 1.6;
  color: var(--faq-faint);
}

/* 图片 */
.page-faq .figure {
  margin: 0;
}

.page-faq .figure__media {
  border: 1px solid var(--line-strong);
  background: var(--ink-2);
  box-shadow: var(--paper-shadow);
  overflow: hidden;
}

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

.page-faq .figure__caption {
  margin-top: 10px;
  font-family: var(--font-ui);
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--faq-faint);
}

.page-faq .faq-inline-figure {
  margin: 4px 0 14px;
}

/* 工作区 */
.page-faq .faq-work {
  padding: clamp(26px, 5vw, 60px) 0 clamp(44px, 7vw, 88px);
  background: var(--ink);
}

.page-faq .faq-work__grid {
  display: grid;
  gap: clamp(20px, 3vw, 40px);
}

/* 左侧目录 */
.page-faq .faq-index {
  border: 1px solid var(--line);
  background: var(--ink-2);
  padding: clamp(14px, 2.4vw, 20px);
  box-shadow: var(--paper-shadow);
}

.page-faq .faq-index__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--signal-soft);
}

.page-faq .faq-filter__label {
  display: block;
  font-family: var(--font-ui);
  font-size: 12.5px;
  color: var(--faq-faint);
  margin-bottom: 6px;
}

.page-faq .faq-filter__box {
  display: flex;
  align-items: center;
  gap: 8px;
  border: 1px solid var(--line-strong);
  background: rgba(11, 26, 43, 0.6);
  padding: 0 10px;
  transition: border-color var(--step), box-shadow var(--step);
}

.page-faq .faq-filter__box:focus-within {
  border-color: var(--signal);
  box-shadow: inset 0 0 0 1px var(--signal);
}

.page-faq .faq-filter__key {
  flex: none;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink);
  background: var(--signal);
  padding: 1px 6px;
}

.page-faq .faq-filter__input {
  flex: 1 1 auto;
  min-width: 0;
  border: 0;
  background: transparent;
  color: var(--paper);
  font-family: var(--font-ui);
  font-size: 14px;
  padding: 10px 0;
}

.page-faq .faq-filter__input::placeholder {
  color: var(--rock);
}

.page-faq .faq-filter__input:focus {
  outline: none;
}

.page-faq .faq-index__body {
  margin-top: 16px;
  border-top: 1px solid var(--line);
  padding-top: 14px;
}

.page-faq .faq-tree + .faq-tree {
  margin-top: 14px;
}

.page-faq .faq-tree__label {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--sage);
}

.page-faq .faq-tree__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-left: 1px solid var(--line);
}

.page-faq .faq-tree__link {
  display: block;
  margin-left: -1px;
  padding: 7px 8px 7px 12px;
  border-left: 2px solid transparent;
  font-family: var(--font-ui);
  font-size: 13.5px;
  line-height: 1.5;
  color: var(--faq-soft);
  text-decoration: none;
  transition: color var(--step), border-color var(--step), background var(--step);
}

.page-faq .faq-tree__link:hover,
.page-faq .faq-tree__link:focus-visible {
  color: var(--paper);
  border-left-color: var(--signal);
  background: rgba(255, 106, 43, 0.1);
}

.page-faq .faq-index__foot {
  margin: 16px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--rock);
}

/* 右侧答案 */
.page-faq .faq-answers {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
  min-width: 0;
}

.page-faq .faq-group__head {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 10px 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line-strong);
  margin-bottom: 14px;
}

.page-faq .faq-group__no {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--ink);
  background: var(--signal);
  padding: 2px 8px;
}

.page-faq .faq-group__title {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(19px, 3vw, 25px);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-faq .faq-group__note {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--rock);
}

.page-faq .qa-list {
  display: grid;
  gap: 10px;
}

.page-faq .qa {
  background: var(--paper);
  color: var(--ink);
  border: 1px solid var(--sheet);
  box-shadow: var(--paper-shadow);
  transition: transform var(--step), box-shadow var(--step);
}

@media (hover: hover) {
  .page-faq .qa:hover {
    transform: translateY(-2px);
    box-shadow: 0 2px 0 rgba(232, 228, 216, 0.16), 0 22px 34px -24px rgba(0, 0, 0, 0.8);
  }
}

.page-faq .qa__q {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-ui);
  font-size: 15.5px;
  font-weight: 600;
  line-height: 1.55;
  color: var(--ink);
}

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

.page-faq .qa__q::marker {
  content: "";
}

.page-faq .qa[open] > .qa__q {
  border-bottom: 1px solid var(--ink-line);
}

.page-faq .qa__no {
  flex: none;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--ink);
  background: var(--signal);
  padding: 1px 6px;
  transform: translateY(-1px);
}

.page-faq .qa__text {
  flex: 1 1 auto;
  min-width: 0;
}

.page-faq .qa__mark {
  flex: none;
  position: relative;
  width: 14px;
  height: 14px;
  align-self: center;
}

.page-faq .qa__mark::before,
.page-faq .qa__mark::after {
  content: "";
  position: absolute;
  background: var(--ink);
}

.page-faq .qa__mark::before {
  top: 6px;
  left: 0;
  width: 14px;
  height: 2px;
}

.page-faq .qa__mark::after {
  top: 0;
  left: 6px;
  width: 2px;
  height: 14px;
  transition: transform var(--step);
}

.page-faq .qa[open] .qa__mark::after {
  transform: scaleY(0);
}

.page-faq .qa__body {
  padding: 14px 16px 16px;
}

.page-faq .qa__conclusion {
  position: relative;
  display: flex;
  gap: 10px;
  margin: 0 0 12px;
  padding: 11px 14px;
  background: var(--sheet);
  border-left: 3px solid var(--signal);
  font-family: var(--font-mono);
  font-size: 13.5px;
  line-height: 1.7;
  letter-spacing: 0.01em;
  color: var(--ink);
}

.page-faq .qa__conclusion::before {
  content: "";
  flex: none;
  width: 8px;
  height: 8px;
  margin-top: 7px;
  background: var(--signal);
  border-radius: 50%;
}

.page-faq .qa__body p {
  margin: 0 0 10px;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--faq-ink-soft);
}

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

.page-faq .qa__path {
  font-family: var(--font-ui);
  font-size: 14px;
  color: var(--ink);
}

.page-faq .qa__body a {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--signal);
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
  font-weight: 600;
}

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

.page-faq .qa__body .mono {
  font-size: 13px;
  color: var(--ink);
  background: rgba(255, 179, 122, 0.28);
  padding: 1px 5px;
}

.page-faq .qa__tools {
  display: flex;
  justify-content: flex-end;
  margin-top: 12px;
}

.page-faq .copy-btn {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.05em;
  color: var(--ink);
  background: transparent;
  border: 1px solid rgba(11, 26, 43, 0.26);
  padding: 5px 10px;
  cursor: pointer;
  transition: background var(--step), color var(--step), border-color var(--step);
}

.page-faq .copy-btn:hover,
.page-faq .copy-btn:focus-visible {
  background: var(--signal);
  border-color: var(--signal);
  color: var(--ink);
}

.page-faq .copy-btn[data-copied] {
  background: var(--moss);
  border-color: var(--moss);
  color: var(--paper);
}

/* 兜底提示卡 */
.page-faq .faq-help {
  border: 1px solid var(--line-strong);
  background: var(--ink-2);
  padding: clamp(16px, 3vw, 26px);
  box-shadow: var(--paper-shadow);
}

.page-faq .faq-help__title {
  margin: 0 0 12px;
  font-family: var(--font-head);
  font-size: clamp(17px, 2.6vw, 20px);
  font-weight: 800;
  color: var(--paper);
  letter-spacing: -0.01em;
}

.page-faq .faq-help ol {
  margin: 0;
  padding-left: 1.25em;
  font-size: 15px;
  line-height: 1.9;
  color: var(--faq-soft);
}

.page-faq .faq-help li::marker {
  font-family: var(--font-mono);
  color: var(--signal-soft);
}

.page-faq .faq-help__foot {
  margin: 12px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  font-family: var(--font-ui);
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--faq-faint);
}

/* 焦点可见 */
.page-faq a:focus-visible,
.page-faq .qa__q:focus-visible,
.page-faq .copy-btn:focus-visible,
.page-faq .faq-filter__input:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 2px;
}

.page-faq .qa__q:focus-visible {
  outline-offset: -3px;
}

@media (min-width: 720px) {
  .page-faq .faq-index__body {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px 18px;
  }

  .page-faq .faq-tree + .faq-tree {
    margin-top: 0;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.02fr);
    align-items: start;
  }

  .page-faq .qa__q {
    padding: 16px 20px;
    font-size: 16px;
  }

  .page-faq .qa__body {
    padding: 16px 20px 18px;
  }
}

@media (min-width: 960px) {
  .page-faq .faq-work__grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    align-items: start;
  }

  .page-faq .faq-index {
    position: sticky;
    top: calc(var(--head-h) + var(--rail-h) + 14px);
    max-height: calc(100vh - var(--head-h) - var(--rail-h) - 34px);
    overflow-y: auto;
    overscroll-behavior: contain;
  }

  .page-faq .faq-index__body {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa,
  .page-faq .qa__mark::after,
  .page-faq .faq-tree__link,
  .page-faq .copy-btn,
  .page-faq .faq-filter__box {
    transition: none;
  }

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