.page-faq {
  --faq-rail: 236px;
  --faq-gap: clamp(22px, 3vw, 44px);
  --faq-glow: 180ms var(--ease);
  padding-bottom: clamp(64px, 9vw, 120px);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  display: grid;
  gap: clamp(22px, 3.5vw, 40px);
  padding: clamp(18px, 3vw, 34px) 0 clamp(26px, 4vw, 48px);
}

.page-faq .faq-hero__title {
  margin: 16px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(38px, 8.4vw, 74px);
  line-height: 0.98;
  letter-spacing: -0.02em;
  color: var(--text);
}

.page-faq .faq-hero__title .hl {
  color: var(--lime);
}

.page-faq .faq-hero__lede {
  margin: 20px 0 0;
  max-width: 52ch;
  font-size: 17px;
  line-height: 1.8;
  color: var(--text);
}

.page-faq .faq-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 26px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.page-faq .faq-hero__meta b {
  font-family: var(--font-mono);
  font-size: 17px;
  font-variant-numeric: tabular-nums;
  color: var(--lime);
  margin-right: 5px;
}

.page-faq .faq-hero__media {
  align-self: end;
}

.page-faq .faq-hero__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ---------- 移动端快速跳转标签带 ---------- */
.page-faq .faq-tabs {
  margin: 0 0 clamp(18px, 3vw, 30px);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

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

.page-faq .faq-tabs__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 10px 0;
  list-style: none;
  min-width: max-content;
}

.page-faq .faq-tabs__link {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  min-height: 44px;
  padding: 0 15px;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: var(--glass);
  color: var(--text);
  font-size: 14px;
  text-decoration: none;
  white-space: nowrap;
  transition: border-color var(--faq-glow), color var(--faq-glow);
}

.page-faq .faq-tabs__link:hover,
.page-faq .faq-tabs__link:focus-visible {
  border-color: var(--rose);
  color: var(--lime);
}

.page-faq .faq-tabs__no {
  font-family: var(--font-mono);
  font-size: 12px;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.08em;
  color: var(--amber);
}

/* ---------- 主体两栏 ---------- */
.page-faq .faq-layout {
  display: grid;
  gap: var(--faq-gap);
}

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

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

.page-faq .faq-group {
  scroll-margin-top: calc(var(--strip-h) + 24px);
  padding-top: clamp(26px, 4vw, 44px);
}

.page-faq .faq-group:first-child {
  padding-top: 0;
}

.page-faq .faq-group + .faq-group {
  margin-top: clamp(30px, 4.5vw, 56px);
  border-top: 1px solid var(--line);
}

.page-faq .faq-group__intro {
  max-width: 62ch;
  margin: 12px 0 0;
  font-size: 16px;
  line-height: 1.75;
  color: var(--muted);
}

.page-faq .faq-group__intro a {
  color: var(--lime);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 问答条目 ---------- */
.page-faq .qa-list {
  display: grid;
  gap: 10px;
  margin-top: 22px;
}

.page-faq .qa {
  border: 1px solid var(--line);
  border-radius: 3px;
  background: var(--ink-800);
  transition: border-color var(--faq-glow), background-color var(--faq-glow);
}

.page-faq .qa:hover {
  border-color: #2c5346;
}

.page-faq .qa[open] {
  background: var(--ink-700);
  border-color: #2f5a4a;
  box-shadow: inset 3px 0 0 var(--amber);
}

.page-faq .qa__head {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr) 18px;
  grid-template-areas:
    "no q mark"
    "no hint mark";
  column-gap: 12px;
  row-gap: 4px;
  align-items: start;
  padding: 15px 16px;
  cursor: pointer;
  list-style: none;
}

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

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

.page-faq .qa__no {
  grid-area: no;
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.06em;
  color: var(--muted);
  transition: color var(--faq-glow), text-shadow var(--faq-glow);
}

.page-faq .qa[open] .qa__no {
  color: var(--amber);
  text-shadow: 0 0 14px rgba(255, 180, 67, 0.5);
}

.page-faq .qa__q {
  grid-area: q;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--text);
}

.page-faq .qa__hint {
  grid-area: hint;
  font-size: 13px;
  line-height: 1.5;
  color: var(--muted);
}

.page-faq .qa__mark {
  grid-area: mark;
  position: relative;
  justify-self: end;
  width: 16px;
  height: 16px;
  margin-top: 5px;
}

.page-faq .qa__mark::before,
.page-faq .qa__mark::after {
  content: "";
  position: absolute;
  background: var(--lime);
  transition: transform var(--faq-glow), background-color var(--faq-glow);
}

.page-faq .qa__mark::before {
  left: 0;
  top: 7px;
  width: 16px;
  height: 2px;
}

.page-faq .qa__mark::after {
  left: 7px;
  top: 0;
  width: 2px;
  height: 16px;
}

.page-faq .qa[open] .qa__mark::before {
  background: var(--rose);
}

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

.page-faq .qa__body {
  margin: 0 16px;
  padding: 16px 20px 20px 66px;
  border-top: 1px solid var(--line);
}

.page-faq .qa__body p {
  margin: 0 0 0.9em;
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
}

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

.page-faq .qa__body a {
  color: var(--lime);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color var(--faq-glow);
}

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

.page-faq .qa__list {
  display: grid;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .qa__list li {
  position: relative;
  padding-left: 20px;
  font-size: 16px;
  line-height: 1.7;
  color: var(--text);
}

.page-faq .qa__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.78em;
  width: 11px;
  height: 2px;
  background: var(--lime);
}

/* ---------- 纠错段落的分栏与配图 ---------- */
.page-faq .faq-split {
  display: grid;
  gap: clamp(18px, 3vw, 32px);
  align-items: start;
}

.page-faq .faq-split .qa-list {
  margin-top: 22px;
}

.page-faq .faq-figure {
  align-self: start;
}

.page-faq .faq-figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ---------- 导出格式对比 ---------- */
.page-faq .fmt-grid {
  display: grid;
  gap: 12px;
  margin-top: 24px;
}

.page-faq .fmt-card {
  padding: 18px 18px 20px;
  border: 1px solid var(--line);
  border-radius: 3px;
  background: var(--ink-800);
}

.page-faq .fmt-card--csv {
  border-top: 2px solid var(--lime);
}

.page-faq .fmt-card--json {
  border-top: 2px solid var(--cyan);
}

.page-faq .fmt-card__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--lime);
}

.page-faq .fmt-card--json .fmt-card__title {
  color: var(--cyan);
}

.page-faq .fmt-card__list {
  display: grid;
  gap: 9px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .fmt-card__list li {
  position: relative;
  padding-left: 18px;
  font-size: 15px;
  line-height: 1.65;
  color: var(--muted);
}

.page-faq .fmt-card__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.78em;
  width: 10px;
  height: 2px;
  background: var(--line);
}

/* ---------- 桌面端：左侧编号索引 ---------- */
@media (min-width: 1024px) {
  .page-faq .faq-tabs {
    display: none;
  }

  .page-faq .faq-hero {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
    padding-bottom: clamp(32px, 4vw, 60px);
  }

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

  .page-faq .faq-index {
    display: block;
    position: sticky;
    top: calc(var(--strip-h) + 28px);
  }

  .page-faq .faq-index__title {
    margin: 0 0 14px;
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: 0.18em;
    color: var(--muted);
  }

  .page-faq .faq-index__list {
    position: relative;
    margin: 0;
    padding: 0 0 0 15px;
    list-style: none;
  }

  .page-faq .faq-index__list::before {
    content: "";
    position: absolute;
    left: 0;
    top: 4px;
    bottom: 4px;
    width: 1px;
    background: linear-gradient(180deg, #c6ff3d, #66d493 48%, #3de0d0 76%, #ffb443);
    opacity: 0.7;
  }

  .page-faq .faq-index__link {
    display: grid;
    grid-template-columns: 30px minmax(0, 1fr);
    grid-template-areas:
      "no label"
      ". count";
    column-gap: 10px;
    row-gap: 3px;
    padding: 10px 12px;
    border-radius: 2px;
    text-decoration: none;
    transition: background-color var(--faq-glow);
  }

  .page-faq .faq-index__link:hover,
  .page-faq .faq-index__link:focus-visible {
    background: linear-gradient(90deg, rgba(198, 255, 61, 0.1), transparent 78%);
  }

  .page-faq .faq-index__no {
    grid-area: no;
    font-family: var(--font-mono);
    font-size: 13px;
    font-variant-numeric: tabular-nums;
    letter-spacing: 0.08em;
    color: var(--lime);
  }

  .page-faq .faq-index__list > li:nth-child(1) .faq-index__no { color: #c6ff3d; }
  .page-faq .faq-index__list > li:nth-child(2) .faq-index__no { color: #a8f055; }
  .page-faq .faq-index__list > li:nth-child(3) .faq-index__no { color: #89e070; }
  .page-faq .faq-index__list > li:nth-child(4) .faq-index__no { color: #66d493; }
  .page-faq .faq-index__list > li:nth-child(5) .faq-index__no { color: #45c9b4; }
  .page-faq .faq-index__list > li:nth-child(6) .faq-index__no { color: #3de0d0; }

  .page-faq .faq-index__label {
    grid-area: label;
    font-size: 14px;
    line-height: 1.45;
    color: var(--text);
  }

  .page-faq .faq-index__count {
    grid-area: count;
    font-family: var(--font-mono);
    font-size: 12px;
    font-variant-numeric: tabular-nums;
    letter-spacing: 0.06em;
    color: var(--muted);
  }

  .page-faq .faq-split {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
  }

  .page-faq .faq-figure {
    position: sticky;
    top: calc(var(--strip-h) + 28px);
  }

  .page-faq .fmt-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }
}

/* ---------- 中等宽度 ---------- */
@media (min-width: 720px) and (max-width: 1023px) {
  .page-faq .fmt-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* ---------- 窄屏收边 ---------- */
@media (max-width: 560px) {
  .page-faq .faq-hero__title {
    font-size: clamp(33px, 10vw, 44px);
  }

  .page-faq .qa__head {
    grid-template-columns: 30px minmax(0, 1fr) 18px;
    column-gap: 9px;
    padding: 14px 13px;
  }

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

  .page-faq .qa__body {
    margin: 0 13px;
    padding: 14px 4px 18px 4px;
  }

  .page-faq .qa__body p,
  .page-faq .qa__list li {
    font-size: 15.5px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa,
  .page-faq .qa__no,
  .page-faq .qa__mark::before,
  .page-faq .qa__mark::after,
  .page-faq .faq-tabs__link,
  .page-faq .qa__body a {
    transition: none;
  }
}