.page-faq {
  display: block;
  --faq-index-w: 260px;
  --faq-line: 1px solid var(--hair);
}

/* ---------- 页面头部 ---------- */
.page-faq .page-head {
  padding-top: 8px;
  padding-bottom: 34px;
  position: relative;
}
.page-faq .page-head::after {
  content: "";
  position: absolute;
  right: 0;
  top: 0;
  width: 78px;
  height: 78px;
  background: linear-gradient(135deg, transparent 48%, var(--cyan) 49%, var(--cyan) 51%, transparent 52%);
  opacity: .28;
  pointer-events: none;
}
.page-faq .page-head__title {
  margin: 6px 0 14px;
  font-family: var(--font-display);
  font-size: clamp(30px, 5.5vw, 58px);
  font-weight: 700;
  letter-spacing: .02em;
  line-height: 1.05;
  color: var(--text);
}
.page-faq .page-head__lede {
  max-width: 62ch;
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 首屏图形 ---------- */
.page-faq .faq-hero {
  margin: 0 0 30px;
  border: var(--faq-line);
  background: var(--panel);
  position: relative;
  overflow: hidden;
}
.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 22% 30%, rgba(34, 224, 208, .14) 0, transparent 42%),
    linear-gradient(90deg, rgba(38, 51, 63, .55) 1px, transparent 1px);
  background-size: 100% 100%, 64px 100%;
  pointer-events: none;
  z-index: 1;
}
.page-faq .faq-hero__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1000 / 600;
  object-fit: cover;
  filter: saturate(.7) contrast(1.05);
  position: relative;
  z-index: 0;
}
.page-faq .faq-hero__cap {
  position: relative;
  z-index: 2;
  margin: 0;
  padding: 12px 18px;
  border-top: var(--faq-line);
  background: var(--steel);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--mist);
}
.page-faq .faq-hero__code {
  display: inline-block;
  margin-right: 10px;
  padding: 2px 7px;
  border: 1px solid var(--hair);
  color: var(--gold);
  font-size: 11px;
  letter-spacing: .12em;
}

/* ---------- 筛选栏 ---------- */
.page-faq .filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 28px;
}
.page-faq .filter-bar__btn {
  appearance: none;
  cursor: pointer;
  padding: 8px 14px;
  border: var(--faq-line);
  border-radius: var(--radius);
  background: transparent;
  color: var(--mist);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  transition: color .2s var(--ease-out), border-color .2s var(--ease-out), background-color .2s var(--ease-out);
}
.page-faq .filter-bar__btn:hover {
  color: var(--text);
  border-color: var(--cyan-deep);
}
.page-faq .filter-bar__btn[aria-pressed="true"] {
  color: var(--ink-950);
  background: var(--cyan);
  border-color: var(--cyan);
  font-weight: 600;
}

/* ---------- 两栏骨架 ---------- */
.page-faq .faq-shell {
  display: grid;
  grid-template-columns: 1fr;
  gap: 34px;
  align-items: start;
}

/* ---------- 左侧索引 ---------- */
.page-faq .faq-index {
  position: relative;
}
.page-faq .faq-index__label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--gold);
}
.page-faq .faq-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 12px;
  overflow-x: auto;
  scrollbar-width: none;
}
.page-faq .faq-index__list::-webkit-scrollbar { display: none; }
.page-faq .faq-index__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  white-space: nowrap;
  padding: 8px 4px;
  border-bottom: 2px solid transparent;
  color: var(--mist);
  text-decoration: none;
  transition: color .2s var(--ease-out), border-color .2s var(--ease-out);
}
.page-faq .faq-index__link:hover { color: var(--text); }
.page-faq .faq-index__link[aria-current="true"],
.page-faq .faq-index__link.is-active {
  color: var(--text);
  border-bottom-color: var(--gold);
}
.page-faq .faq-index__num {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  color: var(--gold);
  letter-spacing: .06em;
}
.page-faq .faq-index__name {
  font-size: 14px;
  font-weight: 500;
}
.page-faq .faq-index__foot {
  display: none;
  margin: 20px 0 0;
  padding-top: 16px;
  border-top: var(--faq-line);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.9;
  color: var(--mist);
}

/* ---------- 右侧问答主体 ---------- */
.page-faq .faq-body {
  min-width: 0;
}
.page-faq .faq-group {
  margin-bottom: 46px;
  scroll-margin-top: 84px;
}
.page-faq .faq-group__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--cyan-deep);
  margin-bottom: 4px;
}
.page-faq .faq-group__num {
  font-family: var(--font-display);
  font-size: clamp(34px, 6vw, 52px);
  font-weight: 700;
  line-height: .9;
  color: transparent;
  -webkit-text-stroke: 1px var(--gold);
  letter-spacing: .02em;
}
.page-faq .faq-group__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(20px, 3vw, 26px);
  font-weight: 600;
  letter-spacing: .02em;
  color: var(--text);
}
.page-faq .faq-group__meta {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--mist);
}

/* ---------- 折叠问答 ---------- */
.page-faq .fold {
  border-bottom: var(--faq-line);
  background: transparent;
}
.page-faq .fold__sum {
  position: relative;
  cursor: pointer;
  list-style: none;
  padding: 18px 42px 18px 0;
  font-size: 16px;
  font-weight: 500;
  line-height: 1.55;
  color: var(--text);
  transition: color .2s var(--ease-out);
}
.page-faq .fold__sum::-webkit-details-marker { display: none; }
.page-faq .fold__sum::marker { content: ""; }
.page-faq .fold__sum::after {
  content: "+";
  position: absolute;
  right: 6px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--cyan);
  transition: transform .24s var(--ease-out), color .2s var(--ease-out);
}
.page-faq .fold__sum:hover { color: var(--mint); }
.page-faq .fold[open] > .fold__sum {
  color: var(--cyan);
}
.page-faq .fold[open] > .fold__sum::after {
  content: "−";
  transform: translateY(-50%) rotate(180deg);
}
.page-faq .fold__body {
  padding: 0 34px 20px 0;
  border-left: 1px solid transparent;
  transition: border-color .24s var(--ease-out), padding-left .24s var(--ease-out);
}
.page-faq .fold[open] > .fold__body {
  border-left-color: var(--cyan);
  padding-left: 16px;
}
.page-faq .fold__body p {
  margin: 0 0 12px;
  max-width: 66ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--mist);
}
.page-faq .faq-more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--cyan);
  text-decoration: none;
  transition: transform .2s var(--ease-out), color .2s var(--ease-out);
}
.page-faq .faq-more::after {
  content: "→";
  transition: transform .2s var(--ease-out);
}
.page-faq .faq-more:hover {
  color: var(--mint);
  transform: translateY(-2px);
}
.page-faq .faq-more:hover::after { transform: translateX(3px); }

/* 聚焦态 */
.page-faq .fold__sum:focus-visible,
.page-faq .faq-index__link:focus-visible,
.page-faq .filter-bar__btn:focus-visible,
.page-faq .faq-more:focus-visible {
  outline: 2px solid var(--mint);
  outline-offset: 3px;
}

/* ---------- 纠错流程图 ---------- */
.page-faq .faq-figure {
  margin: 22px 0 6px;
  border: var(--faq-line);
  background: var(--panel);
}
.page-faq .faq-figure__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1200 / 700;
  object-fit: cover;
  filter: saturate(.65) contrast(1.06);
}
.page-faq .faq-figure__cap {
  margin: 0;
  padding: 11px 16px;
  border-top: var(--faq-line);
  background: var(--steel);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--mist);
}

/* ---------- 仍未解决 ---------- */
.page-faq .faq-help {
  margin-top: 20px;
  padding-top: 34px;
  border-top: 1px solid var(--cyan-deep);
  scroll-margin-top: 84px;
}
.page-faq .faq-help__head {
  max-width: 60ch;
  margin-bottom: 26px;
}
.page-faq .faq-help__num {
  display: block;
  font-family: var(--font-display);
  font-size: 44px;
  font-weight: 700;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px var(--gold);
}
.page-faq .faq-help__title {
  margin: 8px 0 12px;
  font-family: var(--font-display);
  font-size: clamp(22px, 3.4vw, 30px);
  font-weight: 600;
  letter-spacing: .02em;
  color: var(--text);
}
.page-faq .faq-help__lede {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}
.page-faq .faq-help__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}
.page-faq .faq-help__card {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.page-faq .faq-help__value {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: .02em;
  color: var(--cyan);
  word-break: break-all;
}
.page-faq .faq-help__card--paper .faq-help__value {
  color: var(--ink-950);
}
.page-faq .faq-help__note {
  margin: 0 0 auto;
  font-size: 13px;
  line-height: 1.75;
  color: var(--mist);
}
.page-faq .faq-help__card--paper .faq-help__note {
  color: #414B57;
}
.page-faq .faq-help__card .btn {
  align-self: flex-start;
  margin-top: 6px;
}
.page-faq .copy-status {
  min-height: 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--mint);
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-faq .faq-help__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-faq .faq-help__card--paper {
    grid-column: 1 / -1;
  }
}

@media (min-width: 960px) {
  .page-faq .page-head {
    padding-bottom: 46px;
  }
  .page-faq .faq-hero {
    margin-bottom: 38px;
  }
  .page-faq .faq-shell {
    grid-template-columns: var(--faq-index-w) minmax(0, 1fr);
    gap: 54px;
  }
  .page-faq .faq-index {
    position: sticky;
    top: 92px;
  }
  .page-faq .faq-index__list {
    flex-direction: column;
    gap: 2px;
    overflow-x: visible;
  }
  .page-faq .faq-index__link {
    white-space: normal;
    padding: 10px 0 10px 14px;
    border-bottom: none;
    border-left: 3px solid transparent;
    transition: color .2s var(--ease-out), border-color .2s var(--ease-out), background-color .2s var(--ease-out);
  }
  .page-faq .faq-index__link:hover {
    background: rgba(14, 22, 34, .6);
  }
  .page-faq .faq-index__link[aria-current="true"],
  .page-faq .faq-index__link.is-active {
    border-left-color: var(--gold);
    border-bottom-color: transparent;
    background: rgba(14, 22, 34, .8);
  }
  .page-faq .faq-index__foot {
    display: block;
  }
  .page-faq .faq-help__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-faq .faq-help__card--paper {
    grid-column: auto;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .fold__sum::after,
  .page-faq .fold__body,
  .page-faq .faq-more,
  .page-faq .faq-more::after,
  .page-faq .filter-bar__btn,
  .page-faq .faq-index__link {
    transition: none !important;
  }
}