.page-faq {
  --faq-rail: 224px;
  --faq-indent: 34px;
  display: block;
  padding-bottom: 64px;
  color: var(--c-bone);
}

/* 首屏 */
.page-faq .faq-hero {
  display: grid;
  grid-template-columns: 1fr;
  border-bottom: var(--hair);
}

.page-faq .faq-hero__main {
  padding: 20px 0 26px;
  min-width: 0;
}

.page-faq .faq-hero__aside {
  padding: 0 0 26px;
  min-width: 0;
}

.page-faq .faq-kicker {
  margin: 18px 0 10px;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--c-gold);
  text-transform: none;
}

.page-faq h1 {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(30px, 6.4vw, 62px);
  line-height: 1.06;
  letter-spacing: -.01em;
  color: var(--c-bone);
  max-width: 18ch;
}

.page-faq .faq-lede {
  margin: 0;
  max-width: 60ch;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--c-bone);
}

.page-faq .faq-figures {
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: var(--hair);
  border-left: var(--hair);
}

.page-faq .faq-figures__item {
  padding: 12px 12px 14px;
  border-right: var(--hair);
  border-bottom: var(--hair);
  background: var(--c-ink);
}

.page-faq .faq-figures dt {
  font-size: 12px;
  line-height: 1.5;
  color: var(--c-sand);
  letter-spacing: .04em;
}

.page-faq .faq-figures dd {
  margin: 6px 0 0;
  display: flex;
  align-items: baseline;
  gap: 5px;
  color: var(--c-bone);
}

.page-faq .faq-figures .num {
  color: var(--c-red);
}

.page-faq .faq-figures .unit {
  color: var(--c-sand);
}

.page-faq .faq-hero__figure {
  margin: 0;
  border: 1px solid var(--c-scale);
  box-shadow: var(--shadow-hard);
}

.page-faq .media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(.72) contrast(1.04);
}

.page-faq .media__caption {
  font-size: 12px;
  line-height: 1.6;
  color: var(--c-sand);
}

/* 主体两栏 */
.page-faq .faq-layout {
  display: grid;
  grid-template-columns: 1fr;
  min-width: 0;
}

.page-faq .faq-rail {
  padding: 22px 0 24px;
  border-bottom: var(--hair);
  min-width: 0;
}

.page-faq .faq-rail .sidebar__title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 15px;
  letter-spacing: .16em;
  color: var(--c-sand);
}

.page-faq .faq-rail__group + .faq-rail__group {
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid var(--c-scale);
}

.page-faq .faq-rail__label {
  margin: 0 0 6px;
  display: flex;
  align-items: baseline;
  gap: 8px;
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--c-ice);
}

.page-faq .faq-rail__label .num {
  font-size: 11px;
  color: var(--c-scale);
  letter-spacing: 0;
}

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

.page-faq .sidebar__toc-link {
  display: flex;
  align-items: baseline;
  gap: 7px;
  padding: 5px 6px 5px 8px;
  border-left: 2px solid transparent;
  font-size: 12.5px;
  line-height: 1.45;
  color: var(--c-sand);
  text-decoration: none;
  transition: color var(--t-fast), border-color var(--t-fast), background-color var(--t-fast);
}

.page-faq .sidebar__toc-link:hover {
  color: var(--c-bone);
  border-left-color: var(--c-ice);
  background: var(--c-ink);
}

.page-faq .sidebar__toc-link:focus-visible {
  outline: 2px solid var(--c-ice);
  outline-offset: 1px;
}

.page-faq .sidebar__toc-link[aria-current],
.page-faq .sidebar__toc-link.is-current {
  color: var(--c-gold);
  border-left-color: var(--c-gold);
}

.page-faq .faq-rail__idx {
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: 11px;
  color: var(--c-scale);
  flex: none;
}

.page-faq .sidebar__toc-link:hover .faq-rail__idx,
.page-faq .sidebar__toc-link[aria-current] .faq-rail__idx {
  color: var(--c-ice);
}

/* 内容区块 */
.page-faq .faq-main {
  min-width: 0;
  padding-bottom: 8px;
}

.page-faq .faq-block {
  padding: 30px 0 34px;
  border-bottom: var(--hair);
}

.page-faq .faq-block--last {
  border-bottom: 0;
}

.page-faq .section-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: baseline;
  gap: 4px 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--c-scale);
}

.page-faq .section-head__idx {
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  color: var(--c-red);
}

.page-faq .section-head__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(20px, 3.4vw, 27px);
  letter-spacing: -.01em;
  color: var(--c-bone);
}

.page-faq .section-head__note {
  grid-column: 1 / -1;
  margin: 0;
  font-family: var(--font-num);
  font-size: 11.5px;
  line-height: 1.6;
  color: var(--c-sand);
}

.page-faq .faq-block__figure {
  margin: 20px 0 0;
  border: 1px solid var(--c-scale);
}

/* 读法示意 */
.page-faq .readmap {
  margin-top: 20px;
  border: 1px solid var(--c-scale);
  background: var(--c-ink);
}

.page-faq .readmap__title {
  margin: 0;
  padding: 10px 14px;
  border-bottom: 1px solid var(--c-scale);
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--c-gold);
}

.page-faq .readmap__svg {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
}

.page-faq .readmap__note {
  margin: 0;
  padding: 10px 14px 12px;
  border-top: 1px solid var(--c-scale);
  color: var(--c-sand);
}

/* 问答条目 */
.page-faq .qa-list {
  margin-top: 6px;
}

.page-faq .qa {
  border-bottom: 1px solid var(--c-scale);
}

.page-faq .qa__summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: start;
  gap: 12px;
  padding: 15px 2px;
  cursor: pointer;
  list-style: none;
  transition: background-color var(--t-fast);
}

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

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

.page-faq .qa__summary:hover {
  background: var(--c-ink);
}

.page-faq .qa__summary:focus-visible {
  outline: 2px solid var(--c-ice);
  outline-offset: -2px;
}

.page-faq .qa__idx {
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  line-height: 1.6;
  letter-spacing: .04em;
  color: var(--c-sand);
  padding-top: 2px;
}

.page-faq .qa[open] .qa__idx {
  color: var(--c-gold);
}

.page-faq .qa__q {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 17px;
  line-height: 1.44;
  letter-spacing: -.005em;
  color: var(--c-bone);
}

.page-faq .qa__caret {
  position: relative;
  width: 14px;
  height: 14px;
  margin-top: 5px;
  border: 1px solid var(--c-scale);
  flex: none;
}

.page-faq .qa__caret::before,
.page-faq .qa__caret::after {
  content: "";
  position: absolute;
  background: var(--c-ice);
}

.page-faq .qa__caret::before {
  left: 3px;
  right: 3px;
  top: 50%;
  height: 1px;
  margin-top: -0.5px;
}

.page-faq .qa__caret::after {
  top: 3px;
  bottom: 3px;
  left: 50%;
  width: 1px;
  margin-left: -0.5px;
  transition: transform var(--t-base), opacity var(--t-base);
}

.page-faq .qa[open] .qa__caret {
  border-color: var(--c-gold);
}

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

.page-faq .qa__summary:hover .qa__caret {
  border-color: var(--c-ice);
}

.page-faq .qa__body {
  margin: 0 2px 18px var(--faq-indent);
  padding-left: 16px;
  border-left: 1px solid var(--c-scale);
  display: grid;
  gap: 8px;
}

.page-faq .qa__body p {
  margin: 0;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--c-bone);
}

.page-faq .qa__note {
  font-size: 12.5px !important;
  line-height: 1.7 !important;
  color: var(--c-sand) !important;
  padding-top: 2px;
}

/* 引用格式条 */
.page-faq .cite-strip {
  margin-top: 24px;
  padding: 14px 16px;
  background: var(--c-smoke);
  border-left: 4px solid var(--c-red);
  box-shadow: var(--shadow-soft);
  display: grid;
  gap: 6px;
}

.page-faq .cite-strip__label {
  margin: 0;
  font-family: var(--font-num);
  font-size: 11.5px;
  letter-spacing: .18em;
  color: var(--c-red);
}

.page-faq .cite-strip__code {
  margin: 0;
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: 14px;
  line-height: 1.6;
  color: var(--c-carbon);
  word-break: break-word;
}

/* 仍未解决 */
.page-faq .unresolved {
  margin-top: 20px;
  padding: 22px 18px 20px;
  background: var(--c-night);
  border: 1px solid var(--c-scale);
  border-left: 4px solid var(--c-ice);
  display: grid;
  gap: 18px;
}

.page-faq .unresolved p {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--c-bone);
}

.page-faq .unresolved__hint {
  margin-top: 10px !important;
  font-size: 13px !important;
  color: var(--c-sand) !important;
}

.page-faq .unresolved__keys {
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--c-scale);
  border-left: 1px solid var(--c-scale);
}

.page-faq .unresolved__keys > div {
  display: grid;
  grid-template-columns: 78px minmax(0, 1fr);
  align-items: baseline;
  gap: 10px;
  padding: 9px 12px;
  border-right: 1px solid var(--c-scale);
  border-bottom: 1px solid var(--c-scale);
}

.page-faq .unresolved__keys dt {
  font-family: var(--font-num);
  font-size: 11.5px;
  letter-spacing: .12em;
  color: var(--c-ice);
}

.page-faq .unresolved__keys dd {
  margin: 0;
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--c-bone);
  word-break: break-word;
}

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

.page-faq .unresolved__actions .btn {
  text-decoration: none;
}

/* 相关链接跑道 */
.page-faq .faq-links {
  margin-top: 20px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: var(--hair);
  border-left: var(--hair);
}

.page-faq .faq-links a {
  padding: 12px 14px;
  border-right: var(--hair);
  border-bottom: var(--hair);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 14px;
  letter-spacing: .02em;
  color: var(--c-bone);
  text-decoration: none;
  transition: background-color var(--t-fast), color var(--t-fast);
}

.page-faq .faq-links a:hover {
  background: var(--c-night);
  color: var(--c-ice);
}

.page-faq .faq-links a:focus-visible {
  outline: 2px solid var(--c-ice);
  outline-offset: -2px;
}

/* 中等以上屏幕 */
@media (min-width: 720px) {
  .page-faq .faq-figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-faq .unresolved__keys {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    border-bottom: 0;
  }

  .page-faq .unresolved__keys > div {
    grid-template-columns: 1fr;
    gap: 4px;
    padding: 12px 14px;
    border-bottom: 0;
  }

  .page-faq .faq-links {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* 宽屏：非对称分栏 + 常驻侧栏 */
@media (min-width: 960px) {
  .page-faq .faq-hero {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr);
  }

  .page-faq .faq-hero__main {
    padding: 42px 40px 44px 0;
    border-right: var(--hair);
  }

  .page-faq .faq-hero__aside {
    padding: 42px 0 44px 40px;
    display: flex;
    align-items: flex-start;
  }

  .page-faq .faq-hero__figure {
    width: 100%;
  }

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

  .page-faq .faq-rail {
    position: sticky;
    top: calc(var(--header-h) + 12px);
    align-self: start;
    max-height: calc(100vh - var(--header-h) - 40px);
    overflow-y: auto;
    padding: 26px 18px 26px 0;
    border-bottom: 0;
    border-right: var(--hair);
  }

  .page-faq .faq-rail .sidebar__list {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .page-faq .faq-main {
    padding-left: 40px;
  }

  .page-faq .faq-block {
    padding: 44px 0 46px;
  }

  .page-faq .qa__summary {
    padding: 17px 4px;
  }

  .page-faq .qa__q {
    font-size: 18px;
  }
}

/* 超宽屏让读法示意与正文形成错位节奏 */
@media (min-width: 1240px) {
  .page-faq .readmap {
    margin-right: 8%;
  }

  .page-faq .cite-strip {
    margin-left: auto;
    max-width: 560px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .sidebar__toc-link,
  .page-faq .qa__summary,
  .page-faq .qa__caret::after,
  .page-faq .faq-links a {
    transition: none;
  }
}