.page-faq {
  --faq-ease: var(--ease, cubic-bezier(.2, .6, .25, 1));
  --faq-accent: var(--signal-top);
  display: block;
  background: var(--ink-950);
  color: var(--on-dark);
}

/* ---------- 面包屑 ---------- */
.page-faq .faq-crumb {
  padding-top: 18px;
  padding-bottom: 4px;
}

.page-faq .faq-crumb .breadcrumb {
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--tick);
}

.page-faq .faq-crumb .breadcrumb a {
  color: var(--tick);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .14s var(--faq-ease), border-color .14s var(--faq-ease);
}

.page-faq .faq-crumb .breadcrumb a:hover,
.page-faq .faq-crumb .breadcrumb a:focus-visible {
  color: var(--score);
  border-bottom-color: var(--score);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  padding-top: 26px;
  padding-bottom: 30px;
  background:
    radial-gradient(1100px 460px at 82% -10%, rgba(255, 90, 43, .16), transparent 62%),
    radial-gradient(760px 380px at 8% 110%, rgba(92, 255, 158, .08), transparent 66%),
    var(--ink-950);
}

.page-faq .faq-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
}

.page-faq .faq-hero__code {
  display: inline-block;
  font: 800 13px/1 var(--font-mono);
  letter-spacing: .18em;
  color: var(--signal-mid);
  padding-bottom: 8px;
  border-bottom: 2px solid var(--signal-top);
}

.page-faq .faq-hero__title {
  margin: 14px 0 0;
  font-size: var(--fs-32);
  line-height: 1.12;
  font-weight: 900;
  letter-spacing: -.02em;
  color: var(--on-dark);
  max-width: 22ch;
}

.page-faq .faq-lede {
  margin: 16px 0 0;
  max-width: 46ch;
  font-size: var(--fs-15);
  line-height: 1.85;
  color: #C6D2E4;
}

.page-faq .faq-version {
  padding: 18px 18px 16px;
  border: 1px solid var(--line-dark);
}

.page-faq .faq-version__label {
  margin: 0;
  color: var(--tick);
}

.page-faq .faq-version__num {
  margin: 6px 0 14px;
  font-size: var(--fs-32);
  font-weight: 800;
  line-height: 1;
  color: var(--score);
  letter-spacing: .01em;
}

.page-faq .faq-version__log {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px dashed var(--line-dark);
  padding-top: 12px;
}

.page-faq .faq-version__log li {
  font: 500 12px/1.7 var(--font-mono);
  color: var(--tick);
  letter-spacing: .02em;
}

.page-faq .faq-version__log li + li {
  margin-top: 4px;
}

.page-faq .faq-version__log .num {
  color: var(--on-dark);
  margin-right: 4px;
}

/* ---------- 横幅图 ---------- */
.page-faq .faq-banner {
  margin: 0;
  border-top: 1px solid var(--line-dark);
  border-bottom: 1px solid var(--line-dark);
  background: var(--ink-800);
}

.page-faq .faq-banner img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 320px;
  object-fit: cover;
}

.page-faq .faq-banner .media-frame__caption {
  padding: 10px 24px 12px;
  font: 500 12px/1.6 var(--font-mono);
  color: var(--tick);
  letter-spacing: .02em;
}

/* ---------- 主体骨架 ---------- */
.page-faq .faq-shell {
  padding-top: 34px;
  padding-bottom: 48px;
}

.page-faq .faq-shell__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}

.page-faq .faq-rail {
  display: none;
}

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

/* ---------- 筛选条 ---------- */
.page-faq .faq-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--line-dark);
}

.page-faq .faq-filter .filter-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  border: 1px solid var(--line-dark);
  border-radius: 999px;
  background: transparent;
  color: var(--tick);
  font: 600 12px/1.4 var(--font-mono);
  letter-spacing: .06em;
  cursor: pointer;
  transition: color .14s var(--faq-ease), border-color .14s var(--faq-ease), background-color .14s var(--faq-ease);
}

.page-faq .faq-filter .filter-btn .num {
  font-size: 11px;
  opacity: .7;
}

.page-faq .faq-filter .filter-btn:hover {
  color: var(--on-dark);
  border-color: var(--tick);
}

.page-faq .faq-filter .filter-btn:focus-visible {
  outline: 2px solid var(--score);
  outline-offset: 2px;
}

.page-faq .faq-filter .filter-btn[aria-pressed="true"],
.page-faq .faq-filter .filter-btn[data-active="true"] {
  background: var(--signal-top);
  border-color: var(--signal-top);
  color: var(--ink-950);
}

/* ---------- 分组 ---------- */
.page-faq .faq-group {
  padding-top: 34px;
  scroll-margin-top: 86px;
}

.page-faq .faq-group + .faq-group {
  margin-top: 34px;
  border-top: 1px solid var(--line-dark);
}

.page-faq .faq-group__head {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: baseline;
  column-gap: 12px;
  row-gap: 4px;
  margin-bottom: 20px;
}

.page-faq .faq-group__idx {
  font: 800 18px/1 var(--font-mono);
  letter-spacing: .04em;
  color: var(--tick);
}

.page-faq .faq-group__head h2 {
  margin: 0;
  font-size: var(--fs-22);
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--on-dark);
}

.page-faq .faq-group__hint {
  grid-column: 2 / -1;
  margin: 0;
  color: var(--tick);
}

.page-faq .faq-group--rule .faq-group__idx {
  color: var(--signal-top);
}

.page-faq .faq-group--data .faq-group__idx {
  color: var(--signal-mid);
}

.page-faq .faq-group--use .faq-group__idx {
  color: var(--signal-third);
}

/* 口径示意图 */
.page-faq .faq-diagram {
  margin: 0 0 20px;
  border: 1px solid var(--line-dark);
  background: var(--ink-800);
}

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

.page-faq .faq-diagram .media-frame__caption {
  padding: 10px 14px 12px;
  border-top: 1px solid var(--line-dark);
  font: 500 12px/1.65 var(--font-mono);
  color: var(--tick);
  letter-spacing: .02em;
}

/* ---------- 折叠问答 ---------- */
.page-faq .faq-item {
  border: 1px solid var(--line-dark);
  border-left: 3px solid var(--tick);
  background: var(--ink-800);
  transition: border-color .14s var(--faq-ease), background-color .14s var(--faq-ease);
}

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

.page-faq .faq-group--rule .faq-item {
  border-left-color: var(--signal-top);
}

.page-faq .faq-group--data .faq-item {
  border-left-color: var(--signal-mid);
}

.page-faq .faq-group--use .faq-item {
  border-left-color: var(--signal-third);
}

.page-faq .faq-item:hover {
  background: var(--ink-700);
}

.page-faq .faq-q {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 15px 15px;
  cursor: pointer;
  list-style: none;
  font-size: var(--fs-17);
  font-weight: 700;
  line-height: 1.55;
  color: var(--on-dark);
  transition: color .14s var(--faq-ease);
}

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

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

.page-faq .faq-q:focus-visible {
  outline: 2px solid var(--score);
  outline-offset: -2px;
}

.page-faq .faq-q__num {
  flex: none;
  font: 800 12px/1.9 var(--font-mono);
  letter-spacing: .04em;
  color: var(--tick);
  min-width: 20px;
}

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

.page-faq .faq-q__mark {
  position: relative;
  flex: none;
  width: 13px;
  height: 13px;
  margin-top: 6px;
}

.page-faq .faq-q__mark::before,
.page-faq .faq-q__mark::after {
  content: "";
  position: absolute;
  background: var(--tick);
  transition: transform .14s var(--faq-ease), background-color .14s var(--faq-ease);
}

.page-faq .faq-q__mark::before {
  top: 5px;
  left: 0;
  width: 13px;
  height: 2px;
}

.page-faq .faq-q__mark::after {
  top: 0;
  left: 5px;
  width: 2px;
  height: 13px;
}

.page-faq .faq-item[open] .faq-q__mark::before {
  background: var(--score);
}

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

.page-faq .faq-a {
  padding: 0 15px 17px 47px;
  font-size: var(--fs-15);
  line-height: 1.85;
  color: #C6D2E4;
  border-top: 1px dashed var(--line-dark);
  margin-top: 0;
  padding-top: 14px;
}

.page-faq .faq-a p {
  margin: 0 0 10px;
}

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

.page-faq .faq-a .link-arrow {
  font-size: var(--fs-13);
  font-weight: 700;
  color: var(--score);
  text-decoration: none;
  border-bottom: 1px solid rgba(92, 255, 158, .34);
  transition: border-color .14s var(--faq-ease);
}

.page-faq .faq-a .link-arrow:hover,
.page-faq .faq-a .link-arrow:focus-visible {
  border-bottom-color: var(--score);
}

.page-faq .faq-note {
  display: block;
  margin-top: 12px;
  padding-top: 9px;
  border-top: 1px dashed var(--line-dark);
  font: 500 12px/1.7 var(--font-mono);
  letter-spacing: .02em;
  color: var(--tick);
}

/* ---------- 结尾反馈 ---------- */
.page-faq .faq-foot {
  padding-top: 40px;
  padding-bottom: 56px;
  background: linear-gradient(180deg, var(--ink-950) 0%, rgba(18, 29, 49, .92) 100%);
  border-top: 1px solid var(--line-dark);
  scroll-margin-top: 86px;
}

.page-faq .faq-foot__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.page-faq .faq-foot__main .eyebrow {
  margin: 0;
  color: var(--tick);
}

.page-faq .faq-foot__main .section-title {
  margin: 8px 0 14px;
  font-size: var(--fs-22);
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--on-dark);
}

.page-faq .faq-foot__text {
  margin: 0 0 12px;
  max-width: 52ch;
  font-size: var(--fs-15);
  line-height: 1.85;
  color: #C6D2E4;
}

.page-faq .faq-foot__main .link-arrow {
  display: inline-block;
  margin-top: 4px;
  font-size: var(--fs-13);
  font-weight: 700;
  color: var(--score);
  text-decoration: none;
  border-bottom: 1px solid rgba(92, 255, 158, .34);
  transition: border-color .14s var(--faq-ease);
}

.page-faq .faq-foot__main .link-arrow:hover,
.page-faq .faq-foot__main .link-arrow:focus-visible {
  border-bottom-color: var(--score);
}

.page-faq .faq-foot__panel {
  padding: 20px 18px;
  border: 1px solid var(--line-dark);
  background: var(--ink-800);
}

.page-faq .faq-foot__panel dl {
  margin: 0;
}

.page-faq .faq-foot__panel dt {
  font: 500 12px/1.6 var(--font-mono);
  letter-spacing: .1em;
  color: var(--tick);
}

.page-faq .faq-foot__panel dd {
  margin: 2px 0 16px;
  font: 800 16px/1.45 var(--font-mono);
  color: var(--on-dark);
  word-break: break-all;
}

.page-faq .faq-foot__panel dd:last-of-type {
  margin-bottom: 0;
}

.page-faq .faq-foot__note {
  margin: 18px 0 8px;
  padding-top: 14px;
  border-top: 1px dashed var(--line-dark);
  color: var(--tick);
  line-height: 1.7;
}

.page-faq .faq-foot__panel .link-arrow {
  font-size: var(--fs-13);
  font-weight: 700;
  color: var(--score);
  text-decoration: none;
  border-bottom: 1px solid rgba(92, 255, 158, .34);
}

.page-faq .faq-foot__panel .link-arrow:hover,
.page-faq .faq-foot__panel .link-arrow:focus-visible {
  border-bottom-color: var(--score);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-faq .faq-hero {
    padding-top: 36px;
    padding-bottom: 40px;
  }

  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1fr) 220px;
    align-items: start;
    column-gap: 28px;
  }

  .page-faq .faq-hero__rail {
    grid-column: 1 / -1;
  }

  .page-faq .faq-banner img {
    max-height: 380px;
  }

  .page-faq .faq-a {
    padding-left: 47px;
  }

  .page-faq .faq-foot__panel {
    padding: 24px 22px;
  }
}

@media (min-width: 768px) {
  .page-faq .faq-hero__title {
    font-size: var(--fs-56);
  }

  .page-faq .faq-hero__code {
    font-size: 14px;
  }

  .page-faq .faq-lede {
    font-size: var(--fs-17);
  }

  .page-faq .faq-group__head h2 {
    font-size: var(--fs-32);
  }

  .page-faq .faq-foot__main .section-title {
    font-size: var(--fs-32);
  }
}

@media (min-width: 1024px) {
  .page-faq .faq-shell {
    padding-top: 44px;
    padding-bottom: 64px;
  }

  .page-faq .faq-shell__grid {
    grid-template-columns: 168px minmax(0, 1fr);
    column-gap: 46px;
  }

  .page-faq .faq-rail {
    display: block;
    position: sticky;
    top: calc(var(--header-h, 64px) + 26px);
    align-self: start;
  }

  .page-faq .faq-rail__title {
    margin: 0 0 12px;
    color: var(--tick);
  }

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

  .page-faq .faq-rail .rail-item {
    position: relative;
  }

  .page-faq .faq-rail .rail-link {
    position: relative;
    display: flex;
    align-items: center;
    gap: 9px;
    padding: 9px 8px 9px 15px;
    font: 600 13px/1.4 var(--font-mono);
    letter-spacing: .02em;
    color: var(--tick);
    text-decoration: none;
    transition: color .14s var(--faq-ease);
  }

  .page-faq .faq-rail .rail-link .num {
    color: inherit;
    opacity: .65;
  }

  .page-faq .faq-rail .rail-link:hover,
  .page-faq .faq-rail .rail-link:focus-visible {
    color: var(--on-dark);
  }

  .page-faq .faq-rail .rail-link[aria-current="true"] {
    color: var(--score);
  }

  .page-faq .faq-rail .rail-link[aria-current="true"]::before {
    content: "";
    position: absolute;
    left: -1px;
    top: 50%;
    transform: translateY(-50%);
    width: 2px;
    height: 62%;
    background: var(--score);
  }

  .page-faq .faq-shell__grid .faq-body {
    border-left: 1px solid var(--line-dark);
    padding-left: 36px;
    margin-left: -36px;
  }

  .page-faq .faq-foot__grid {
    grid-template-columns: minmax(0, 1fr) 330px;
    column-gap: 48px;
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .filter-btn,
  .page-faq .faq-item,
  .page-faq .faq-q,
  .page-faq .faq-q__mark::before,
  .page-faq .faq-q__mark::after {
    transition: none;
  }
}
</main>