.page-faq {
  --faq-num-w: 30px;
  --faq-answer: #A6B9CF;
  --faq-rail-w: 208px;
}

@media (min-width: 720px) {
  .page-faq {
    --faq-num-w: 46px;
  }
}

/* ---------- 面包屑与首屏 ---------- */

.page-faq .breadcrumb {
  padding-top: clamp(18px, 5vw, 44px);
}

.page-faq .faq-mast {
  display: grid;
  gap: 28px;
  padding-top: clamp(18px, 4vw, 36px);
  padding-bottom: clamp(34px, 6vw, 68px);
}

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

.page-faq .faq-mast__title {
  margin: 12px 0 0;
  line-height: 0.96;
  color: var(--paper);
}

.page-faq .faq-mast__lede {
  margin: 22px 0 0;
  max-width: 42ch;
  color: var(--mist);
}

.page-faq .faq-mast__media {
  margin: 0;
  aspect-ratio: 3 / 2;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
  background: var(--deepsea);
}

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

.page-faq .faq-mast__media .media__caption {
  font-size: 12px;
  color: var(--archive);
}

/* ---------- 筛选输入 ---------- */

.page-faq .faq-search {
  margin-top: 30px;
  max-width: 460px;
}

.page-faq .faq-search__label {
  display: block;
  margin-bottom: 9px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--archive);
}

.page-faq .faq-search__input {
  width: 100%;
  box-sizing: border-box;
  padding: 12px 18px;
  background: rgba(16, 35, 63, 0.62);
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  color: var(--paper);
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 400;
  outline: none;
  transition: border-color 180ms var(--ease), background-color 180ms var(--ease);
}

.page-faq .faq-search__input::placeholder {
  color: var(--archive);
}

.page-faq .faq-search__input:focus-visible {
  border-color: var(--cyan);
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-faq .faq-search__hint {
  margin: 10px 0 0;
  font-size: 12px;
  line-height: 1.6;
  color: var(--archive);
}

/* ---------- 主体两栏 ---------- */

.page-faq .faq-body__grid {
  display: grid;
  gap: 26px;
}

.page-faq .faq-rail {
  min-width: 0;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-rail__label {
  margin: 0 0 12px;
}

.page-faq .faq-rail__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 4px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.page-faq .faq-rail__list::-webkit-scrollbar {
  display: none;
}

.page-faq .faq-rail__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 7px 14px;
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  color: var(--tide);
  font-size: 13px;
  white-space: nowrap;
  text-decoration: none;
  transition: color 180ms var(--ease), border-color 180ms var(--ease), background-color 180ms var(--ease);
}

.page-faq .faq-rail__no {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--archive);
  transition: color 180ms var(--ease);
}

.page-faq .faq-rail__link:hover,
.page-faq .faq-rail__link:focus-visible {
  color: var(--mist);
  border-color: var(--orange);
  background: rgba(255, 106, 43, 0.06);
}

.page-faq .faq-rail__link:hover .faq-rail__no,
.page-faq .faq-rail__link:focus-visible .faq-rail__no {
  color: var(--orange);
}

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

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

/* ---------- 分组 ---------- */

.page-faq .faq-group {
  scroll-margin-top: 140px;
}

.page-faq .faq-group + .faq-group {
  margin-top: 52px;
}

.page-faq .faq-group__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 13px;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-group__no {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--orange);
}

.page-faq .faq-group__title {
  margin: 0;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--paper);
}

/* ---------- 折叠条目 ---------- */

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

.page-faq .faq-summary {
  display: grid;
  grid-template-columns: var(--faq-num-w) minmax(0, 1fr) 14px;
  align-items: center;
  gap: 10px;
  padding: 17px 2px;
  cursor: pointer;
  list-style: none;
}

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

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

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

.page-faq .faq-num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  font-variant-numeric: tabular-nums;
  color: var(--archive);
  transition: color 180ms var(--ease);
}

.page-faq .faq-q {
  font-size: 16px;
  font-weight: 500;
  line-height: 1.6;
  color: var(--mist);
  transition: color 180ms var(--ease);
}

.page-faq .faq-details:hover > .faq-summary .faq-q,
.page-faq .faq-details[open] > .faq-summary .faq-q {
  color: var(--paper);
}

.page-faq .faq-details[open] > .faq-summary .faq-num {
  color: var(--orange);
}

.page-faq .faq-chev {
  justify-self: end;
  width: 8px;
  height: 8px;
  margin-top: -4px;
  border-right: 1.5px solid var(--tide);
  border-bottom: 1.5px solid var(--tide);
  transform: rotate(45deg);
  transition: transform 200ms var(--ease), border-color 200ms var(--ease);
}

.page-faq .faq-details[open] .faq-chev {
  margin-top: 4px;
  transform: rotate(225deg);
  border-color: var(--orange);
}

.page-faq .faq-a {
  padding: 2px 18px 24px calc(var(--faq-num-w) + 10px);
}

.page-faq .faq-a p {
  margin: 0;
  max-width: 46ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--faq-answer);
}

.page-faq .faq-a a {
  color: var(--cyan);
  text-decoration: underline;
  text-decoration-color: rgba(79, 227, 209, 0.42);
  text-underline-offset: 3px;
  transition: text-decoration-color 180ms var(--ease);
}

.page-faq .faq-a a:hover,
.page-faq .faq-a a:focus-visible {
  text-decoration-color: var(--cyan);
}

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

/* ---------- 刷新节奏条 ---------- */

.page-faq .faq-rhythm__inner {
  display: grid;
  gap: 32px;
  align-items: center;
}

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

.page-faq .faq-rhythm__title {
  margin: 12px 0 0;
}

.page-faq .faq-rhythm__lede {
  margin: 18px 0 0;
  max-width: 44ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--faq-answer);
}

.page-faq .faq-rhythm__points {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-faq .faq-rhythm__points li {
  display: grid;
  grid-template-columns: 88px minmax(0, 1fr);
  gap: 14px;
  padding: 13px 0;
  border-bottom: 1px solid var(--line);
  font-size: 14px;
  line-height: 1.7;
  color: var(--tide);
}

.page-faq .faq-rhythm__key {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--orange);
  font-variant-numeric: tabular-nums;
}

.page-faq .faq-scale {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  margin-top: 30px;
  border-top: 1px solid var(--line);
}

.page-faq .faq-scale__tick {
  position: relative;
  padding-top: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--archive);
  font-variant-numeric: tabular-nums;
}

.page-faq .faq-scale__tick::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 1px;
  height: 8px;
  background: var(--line);
}

.page-faq .faq-scale__tick--key {
  color: var(--orange);
}

.page-faq .faq-scale__tick--key::before {
  height: 14px;
  background: var(--orange);
}

.page-faq .faq-rhythm__note {
  margin: 22px 0 0;
  max-width: 46ch;
  font-size: 13px;
  line-height: 1.75;
  color: var(--archive);
}

.page-faq .faq-rhythm__note a {
  color: var(--cyan);
  text-decoration: underline;
  text-decoration-color: rgba(79, 227, 209, 0.4);
  text-underline-offset: 3px;
}

.page-faq .faq-rhythm__media {
  margin: 0;
  aspect-ratio: 10 / 3;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
  background: var(--deepsea);
}

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

/* ---------- 结尾支持区块 ---------- */

.page-faq .faq-help__inner {
  max-width: 760px;
}

.page-faq .faq-help__title {
  margin: 12px 0 0;
}

.page-faq .faq-help__text {
  margin-top: 20px;
  color: var(--mist);
}

.page-faq .faq-help__list {
  margin: 34px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-faq .faq-help__list li {
  display: grid;
  grid-template-columns: 68px minmax(0, 1fr);
  gap: 16px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
  font-size: 14px;
  line-height: 1.7;
  color: var(--tide);
}

.page-faq .faq-help__key {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--archive);
}

.page-faq .faq-help__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

/* ---------- 平板与桌面 ---------- */

@media (min-width: 900px) {
  .page-faq .faq-mast {
    grid-template-columns: minmax(0, 1fr) minmax(0, 400px);
    gap: 60px;
    align-items: end;
  }

  .page-faq .faq-rhythm__inner {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.9fr);
    gap: 56px;
  }
}

@media (min-width: 960px) {
  .page-faq .faq-body__grid {
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
    gap: 64px;
    align-items: start;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: 128px;
    padding-bottom: 0;
    border-bottom: 0;
  }

  .page-faq .faq-rail__label {
    margin-bottom: 16px;
  }

  .page-faq .faq-rail__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-faq .faq-rail__link {
    display: flex;
    justify-content: flex-start;
    padding: 11px 0 11px 16px;
    border: 0;
    border-left: 1px solid var(--line);
    border-radius: 0;
    background: none;
    font-size: 14px;
  }

  .page-faq .faq-rail__link:hover,
  .page-faq .faq-rail__link:focus-visible {
    background: none;
    border-left-color: var(--orange);
    color: var(--paper);
  }
}

@media (min-width: 1200px) {
  .page-faq .faq-mast {
    gap: 80px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-chev,
  .page-faq .faq-q,
  .page-faq .faq-num,
  .page-faq .faq-rail__link,
  .page-faq .faq-search__input {
    transition: none;
  }
}