.page-faq {
  --band: var(--flare-orange);
  --faq-panel: rgba(22, 48, 42, .72);
  position: relative;
  background: var(--ink-green-900);
  color: var(--bone-050);
  font-family: var(--font-sans);
}

.page-faq::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(40, 64, 58, .55) 1px, transparent 1px),
    linear-gradient(90deg, rgba(40, 64, 58, .55) 1px, transparent 1px);
  background-size: 88px 88px;
  opacity: .28;
}

.page-faq .faq-shell {
  position: relative;
  z-index: 1;
  max-width: var(--wrap-max);
  margin: 0 auto;
  padding: 24px 28px 84px;
}

/* 首屏 */
.page-faq .faq-hero {
  padding-bottom: 34px;
  border-bottom: 1px solid var(--line-soft);
}

.page-faq .faq-hero__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(30px, 7vw, 52px);
  line-height: 1.14;
  letter-spacing: -.01em;
  color: var(--bone-050);
}

.page-faq .faq-hero__lead {
  margin: 16px 0 0;
  max-width: 40em;
  color: var(--bone-70);
}

.page-faq .faq-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 20px;
  margin: 28px 0 0;
  padding: 0;
}

.page-faq .faq-hero__facts div {
  padding-left: 12px;
  border-left: 2px solid var(--grid-line);
}

.page-faq .faq-hero__facts dt {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--slate-600);
}

.page-faq .faq-hero__facts dd {
  margin: 6px 0 0;
  font-size: 20px;
  color: var(--bone-050);
}

/* 目录 + 正文 */
.page-faq .faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
  margin-top: 24px;
}

.page-faq .faq-toc__title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--slate-600);
}

.page-faq .faq-toc ol {
  display: flex;
  gap: 10px;
  margin: 0;
  padding: 0 0 10px;
  list-style: none;
  overflow-x: auto;
}

.page-faq .faq-toc li {
  flex: 0 0 auto;
}

.page-faq .faq-toc__link {
  display: block;
  padding: 8px 10px;
  border-bottom: 2px solid var(--line-soft);
  color: var(--bone-70);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  text-decoration: none;
  white-space: nowrap;
  transition: color 180ms ease, border-color 180ms ease;
}

.page-faq .faq-toc__link:hover,
.page-faq .faq-toc__link:focus-visible {
  color: var(--bone-050);
  border-bottom-color: var(--volt-blue);
}

.page-faq .faq-toc__link[aria-current="true"] {
  color: var(--bone-050);
  border-bottom-color: var(--flare-orange);
}

/* 分组 */
.page-faq .faq-group {
  padding-top: 34px;
  opacity: .96;
  transition: opacity 240ms ease;
}

.page-faq .faq-group.is-current {
  opacity: 1;
}

.page-faq .faq-group::after {
  content: "";
  display: block;
  height: 4px;
  margin-top: 40px;
  background: var(--band);
}

.page-faq .faq-group .section-head {
  margin-bottom: 22px;
}

.page-faq #faq-scope { --band: var(--flare-orange); }
.page-faq #faq-score { --band: var(--verdict-yellow); }
.page-faq #faq-archive { --band: var(--volt-blue); }
.page-faq #faq-service { --band: var(--clay-600); }
.page-faq #faq-fix { --band: var(--flare-orange); }

/* 图 */
.page-faq .faq-figure {
  position: relative;
  margin: 0 0 26px;
  border: 1px solid var(--line-soft);
  background: var(--moss-800);
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 12 / 7;
  object-fit: cover;
}

.page-faq .media-frame__caption {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--slate-600);
}

/* 折叠问答 */
.page-faq .qa-list {
  border-top: 1px solid var(--line-soft);
}

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

.page-faq .qa__q {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 12px;
  align-items: baseline;
  padding: 15px 6px;
  cursor: pointer;
  list-style: none;
}

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

.page-faq .qa__q:hover .qa__text,
.page-faq .qa__q:focus-visible .qa__text {
  color: var(--flare-orange);
}

.page-faq .qa__index {
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--volt-blue);
}

.page-faq .qa__text {
  font-size: 16px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--bone-050);
  transition: color 180ms ease;
}

.page-faq .qa__chev {
  font-family: var(--font-mono);
  font-size: 16px;
  line-height: 1;
  color: var(--volt-blue);
  transition: transform 180ms ease;
}

.page-faq .qa[open] .qa__chev {
  transform: rotate(90deg);
}

.page-faq .qa__a {
  padding: 2px 6px 20px;
  font-size: 15px;
  line-height: 1.65;
  color: var(--bone-70);
}

.page-faq .qa__a p {
  margin: 0 0 10px;
  max-width: 42em;
}

.page-faq .qa__a ul,
.page-faq .qa__a ol {
  margin: 0 0 12px;
  padding-left: 20px;
  max-width: 42em;
}

.page-faq .qa__a li {
  margin-bottom: 6px;
}

.page-faq .qa__a > *:last-child {
  margin-bottom: 0;
}

.page-faq .qa__a a {
  color: var(--volt-blue);
  text-underline-offset: 3px;
}

.page-faq .qa__a a:hover,
.page-faq .qa__a a:focus-visible {
  color: var(--flare-orange);
}

/* 口径对照表 */
.page-faq .table-scroll {
  margin: 4px 0 6px;
  overflow-x: auto;
}

.page-faq .faq-table {
  width: 100%;
  min-width: 480px;
  font-family: var(--font-mono);
  font-size: 13px;
}

/* 权重公式 */
.page-faq .formula {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 12px;
  align-items: center;
  margin: 4px 0 14px;
  padding: 16px 16px;
  background: var(--moss-800);
  border-left: 3px solid var(--volt-blue);
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.4;
}

.page-faq .formula__term {
  color: var(--bone-050);
  white-space: nowrap;
}

.page-faq .formula__term b {
  margin-left: 6px;
  font-weight: 700;
  color: var(--volt-blue);
}

.page-faq .formula__op {
  color: var(--flare-orange);
  font-weight: 700;
}

.page-faq .formula__eq {
  color: var(--verdict-yellow);
}

/* 算例 */
.page-faq .calc {
  margin: 0 0 14px;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-soft);
}

.page-faq .calc li {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 8px 2px;
  border-bottom: 1px solid var(--line-soft);
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--bone-70);
}

.page-faq .calc__sum {
  color: var(--bone-050);
  font-weight: 700;
  background: var(--flare-soft);
}

/* 纠错流程 */
.page-faq .faq-fixgrid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
}

.page-faq .flow {
  display: grid;
  gap: 14px;
  margin: 0 0 20px;
  padding: 0;
  list-style: none;
}

.page-faq .flow__step {
  position: relative;
  padding: 16px 16px 18px;
  background: var(--faq-panel);
  border: 1px solid var(--line-soft);
}

.page-faq .flow__num {
  display: block;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--volt-blue);
}

.page-faq .flow__title {
  margin: 8px 0 6px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  line-height: 1.3;
  color: var(--bone-050);
}

.page-faq .flow__step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--bone-70);
}

.page-faq .faq-note {
  margin: 0 0 18px;
  padding-left: 14px;
  border-left: 2px solid var(--clay-600);
  font-size: 14px;
  line-height: 1.65;
  color: var(--bone-70);
  max-width: 44em;
}

.page-faq .faq-note a {
  color: var(--volt-blue);
  text-underline-offset: 3px;
}

.page-faq .faq-note .num {
  color: var(--bone-050);
}

.page-faq .faq-fixgrid__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 0;
}

.page-faq .faq-figure--fix {
  margin: 0;
  align-self: start;
}

/* 平板 */
@media (min-width: 720px) {
  .page-faq .faq-shell {
    padding: 32px 48px 110px;
  }

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

  .page-faq .qa__q {
    padding: 17px 8px;
  }

  .page-faq .qa__a {
    padding: 2px 8px 22px 40px;
  }
}

/* 流程横向排布 */
@media (min-width: 900px) {
  .page-faq .flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 22px;
  }

  .page-faq .flow__step:not(:last-child)::after {
    content: "";
    position: absolute;
    top: 32px;
    right: -22px;
    width: 22px;
    height: 1px;
    background: var(--slate-600);
  }
}

/* 桌面双列：常驻目录 */
@media (min-width: 1100px) {
  .page-faq .faq-layout {
    grid-template-columns: 208px minmax(0, 1fr);
    gap: 48px;
    align-items: start;
  }

  .page-faq .faq-toc {
    position: sticky;
    top: calc(var(--header-h) + 20px);
  }

  .page-faq .faq-toc ol {
    display: block;
    padding-bottom: 0;
    overflow: visible;
  }

  .page-faq .faq-toc li {
    flex: none;
  }

  .page-faq .faq-toc__link {
    padding: 9px 12px;
    border-bottom: 0;
    border-left: 2px solid var(--line-soft);
    white-space: normal;
    line-height: 1.5;
  }

  .page-faq .faq-toc__link:hover,
  .page-faq .faq-toc__link:focus-visible {
    border-left-color: var(--volt-blue);
    border-bottom-color: transparent;
  }

  .page-faq .faq-toc__link[aria-current="true"] {
    border-left-color: var(--flare-orange);
    border-bottom-color: transparent;
    background: linear-gradient(90deg, var(--flare-soft), transparent 72%);
  }

  .page-faq .faq-fixgrid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    gap: 34px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa__chev,
  .page-faq .qa__text,
  .page-faq .faq-toc__link,
  .page-faq .faq-group {
    transition: none;
  }
}