.page-faq {
  --faq-rail-w: 236px;
  --faq-gap: clamp(22px, 3vw, 46px);
  --faq-line: rgba(155, 166, 163, .18);
  --faq-text: rgba(237, 230, 214, .8);
}

.page-faq .breadcrumb {
  margin-top: clamp(18px, 3vw, 32px);
}

/* ---------- 首屏框景 ---------- */
.page-faq .faq-masthead {
  position: relative;
  margin-top: 18px;
  padding: clamp(24px, 4vw, 50px) clamp(20px, 3.4vw, 46px) clamp(28px, 4.4vw, 54px);
  border: 1px solid var(--line-gold);
  border-left: 3px solid var(--gold);
  background:
    linear-gradient(135deg, rgba(63, 90, 69, .26), rgba(12, 26, 22, 0) 56%),
    linear-gradient(180deg, rgba(69, 79, 76, .3), rgba(6, 15, 12, .74));
  overflow: hidden;
}

.page-faq .faq-masthead::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 7px;
  background-image: repeating-linear-gradient(90deg, var(--line-gold) 0 1px, transparent 1px 13px);
  opacity: .75;
}

.page-faq .faq-masthead .title-lg {
  margin: 12px 0 0;
  letter-spacing: -.015em;
}

.page-faq .faq-lede {
  max-width: 64ch;
  margin: 18px 0 0;
  font-size: 17px;
  line-height: 1.78;
  color: var(--faq-text);
}

.page-faq .faq-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 18px;
  margin: clamp(26px, 3.6vw, 40px) 0 0;
  padding-top: 22px;
  border-top: 1px solid var(--line-faint);
}

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

.page-faq .faq-stat-label {
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--silver);
  text-transform: uppercase;
}

.page-faq .faq-stat-num {
  margin: 6px 0 0;
  font-family: var(--font-mono);
  font-size: 1.16rem;
  line-height: 1.3;
  color: var(--gold-bright);
  overflow-wrap: anywhere;
}

/* ---------- 左窄右宽壳体 ---------- */
.page-faq .faq-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
  margin-top: clamp(30px, 5vw, 60px);
}

.page-faq .faq-stream {
  display: grid;
  gap: clamp(40px, 6vw, 76px);
  min-width: 0;
}

/* ---------- 粘性索引 ---------- */
.page-faq .faq-index {
  padding: 16px 14px 20px;
  border: 1px solid var(--line-gold);
  background: linear-gradient(180deg, rgba(6, 15, 12, .88), rgba(12, 26, 22, .68));
}

.page-faq .idx-title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--gold-bright);
  text-transform: uppercase;
}

.page-faq .idx-group + .idx-group {
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px solid var(--line-faint);
}

.page-faq .idx-group-title {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 10px;
  font-size: 13px;
  color: var(--ivory);
}

.page-faq .idx-group-code {
  flex: none;
  padding: 1px 5px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--silver);
  border: 1px solid var(--line-faint);
}

.page-faq .idx-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .idx-link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 5px 10px;
  border: 1px solid var(--line-faint);
  border-left: 2px solid var(--stone);
  background: rgba(69, 79, 76, .22);
  color: var(--silver);
  font-size: 13px;
  line-height: 1.45;
  text-decoration: none;
  transition:
    border-color var(--t-frame) var(--ease),
    background-color var(--t-soft) var(--ease),
    color var(--t-soft) var(--ease);
}

.page-faq .idx-code {
  flex: none;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--gold);
}

.page-faq .idx-link:hover,
.page-faq .idx-link:focus-visible {
  border-left-color: var(--gold-bright);
  background: rgba(63, 90, 69, .34);
  color: var(--ivory);
}

/* ---------- 分组标题 ---------- */
.page-faq .faq-group-head {
  max-width: 66ch;
  margin-bottom: clamp(20px, 3vw, 30px);
}

.page-faq .group-flag {
  display: block;
  width: 64px;
  height: 4px;
  margin-bottom: 16px;
  clip-path: polygon(0 0, 100% 0, calc(100% - 9px) 100%, 0 100%);
  background: linear-gradient(90deg, var(--gold), var(--gold-bright));
}

.page-faq .faq-group-limits .group-flag {
  background: linear-gradient(90deg, var(--moss), var(--gold-bright));
}

.page-faq .faq-group-data .group-flag {
  background: linear-gradient(90deg, var(--amber), var(--gold-bright));
}

.page-faq .faq-group-contact .group-flag {
  background: linear-gradient(90deg, var(--clay), var(--amber));
}

.page-faq .group-note {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.72;
  color: rgba(237, 230, 214, .66);
}

/* ---------- 图版 ---------- */
.page-faq .faq-figure {
  margin: 0 0 clamp(24px, 3.4vw, 36px);
  padding: 6px;
  border: 1px solid var(--line-gold);
  background: rgba(6, 15, 12, .5);
}

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

.page-faq .faq-figure-scale {
  max-width: 720px;
}

.page-faq .media-caption {
  display: block;
  margin-top: 10px;
  padding: 0 2px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--silver);
}

/* ---------- 限红刻度 ---------- */
.page-faq .range-scale {
  display: block;
  width: 100%;
  max-width: 560px;
  height: auto;
  margin: 0 0 clamp(24px, 3.4vw, 34px);
  padding: 10px 4px 0;
  border-top: 1px solid var(--line-faint);
  border-bottom: 1px solid var(--line-faint);
}

.page-faq .range-axis {
  stroke: var(--line-gold);
  stroke-width: 1;
}

.page-faq .range-bar {
  fill: var(--stone);
  transition: fill var(--t-soft) var(--ease);
}

.page-faq .range-bar-top {
  fill: var(--amber);
}

.page-faq .range-label {
  fill: var(--silver);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .04em;
}

.page-faq .range-label-top {
  fill: var(--gold-bright);
}

/* ---------- 问答条目 ---------- */
.page-faq .qa-item {
  padding: 24px 0 24px 16px;
  border-top: 1px solid var(--line-faint);
  border-left: 2px solid transparent;
  scroll-margin-top: 92px;
  transition:
    border-color var(--t-soft) var(--ease),
    background-color var(--t-soft) var(--ease);
}

.page-faq .qa-item:last-of-type {
  border-bottom: 1px solid var(--line-faint);
}

.page-faq .qa-item:target,
.page-faq .qa-item:hover {
  border-left-color: var(--clay);
  background: rgba(63, 90, 69, .12);
}

.page-faq .qa-q {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.05rem, 1rem + .5vw, 1.3rem);
  line-height: 1.52;
  letter-spacing: -.01em;
  color: var(--ivory);
}

.page-faq .qa-code {
  flex: none;
  font-family: var(--font-mono);
  font-size: .8em;
  letter-spacing: .03em;
  color: var(--amber);
}

.page-faq .qa-a {
  max-width: 68ch;
}

.page-faq .qa-a p {
  margin: 0 0 1em;
  font-size: 16.5px;
  line-height: 1.78;
  color: var(--faq-text);
}

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

.page-faq .qa-source {
  padding-top: 6px;
  font-size: 12.5px;
  letter-spacing: .03em;
  line-height: 1.7;
  color: var(--silver);
}

.page-faq .qa-source .num {
  font-family: var(--font-mono);
  color: var(--silver);
}

.page-faq .qa-source a {
  color: var(--silver);
  text-decoration: underline;
  text-decoration-color: var(--gold);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: color var(--t-soft) var(--ease);
}

.page-faq .qa-source a:hover,
.page-faq .qa-source a:focus-visible {
  color: var(--gold-bright);
  text-decoration-color: var(--gold-bright);
}

/* ---------- 口径来源注记 ---------- */
.page-faq .faq-note {
  padding: clamp(22px, 3.2vw, 38px);
  border: 1px solid var(--line-gold);
  border-top: 3px solid var(--gold);
  background: linear-gradient(180deg, rgba(69, 79, 76, .3), rgba(6, 15, 12, .68));
}

.page-faq .note-body {
  max-width: 72ch;
}

.page-faq .note-body p {
  margin: 16px 0 0;
  font-size: 16px;
  line-height: 1.78;
  color: var(--faq-text);
}

.page-faq .note-rules {
  display: grid;
  gap: 10px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .note-rules li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-top: 9px;
  border-top: 1px dashed var(--line-faint);
  font-size: 14.5px;
  line-height: 1.7;
  color: rgba(237, 230, 214, .76);
}

.page-faq .note-rules .num {
  flex: none;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--gold-bright);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-faq .faq-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-faq .qa-a {
    padding-left: 46px;
  }

  .page-faq .note-rules {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px 24px;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-shell {
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
    gap: var(--faq-gap);
    align-items: start;
  }

  .page-faq .faq-index {
    position: sticky;
    top: 84px;
    max-height: calc(100vh - 118px);
    overflow-y: auto;
    scrollbar-width: thin;
  }

  .page-faq .idx-list {
    display: grid;
    gap: 2px;
  }

  .page-faq .idx-link {
    padding: 7px 8px 7px 6px;
    border: 0;
    border-left: 2px solid transparent;
    background: transparent;
  }

  .page-faq .idx-link:hover,
  .page-faq .idx-link:focus-visible {
    background: rgba(63, 90, 69, .3);
  }
}

@media (min-width: 1180px) {
  .page-faq {
    --faq-rail-w: 252px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .idx-link,
  .page-faq .qa-item,
  .page-faq .range-bar,
  .page-faq .qa-source a {
    transition: none;
  }
}