.page-faq {
  --faq-rail: 208px;
  --faq-signal-soft: rgba(53, 224, 200, 0.05);
  color: var(--paper-mist);
}

.page-faq .faq-crumb {
  padding-block: clamp(18px, 2.4vw, 30px) 0;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  padding-block: clamp(22px, 3.2vw, 44px) clamp(34px, 4.6vw, 64px);
}

.page-faq .faq-hero__grid {
  display: grid;
  gap: clamp(28px, 4vw, 52px);
  grid-template-columns: minmax(0, 1fr);
}

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

.page-faq .faq-hero__lead h1 {
  margin: 14px 0 0;
  font-size: clamp(1.9rem, 4.4vw, 3.35rem);
  font-weight: 900;
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: var(--paper-mist);
}

.page-faq .faq-hero__intro {
  margin: 20px 0 0;
  max-width: 60ch;
  font-size: clamp(0.98rem, 1.05vw, 1.05rem);
  line-height: 1.85;
  color: var(--paper-mist);
}

.page-faq .faq-hero__hint {
  margin: 14px 0 0;
  max-width: 56ch;
  font-size: 0.86rem;
  line-height: 1.75;
  color: var(--muted-slate);
}

.page-faq .faq-hero__figure {
  margin: 0;
  min-width: 0;
}

.page-faq .faq-hero__figure .figure__frame {
  border: 1px solid var(--grid-line);
  background: var(--ink-layer);
  overflow: hidden;
  box-shadow: var(--shadow-soft);
}

.page-faq .faq-hero__figure img,
.page-faq .faq-lookup__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

@media (min-width: 900px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
  }
}

/* ---------- 归档范围条 ---------- */
.page-faq .faq-strip__list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  background: var(--grid-line);
  border: 1px solid var(--grid-line);
}

.page-faq .faq-strip__item {
  background: var(--ink-base);
  padding: 15px 16px 17px;
  min-width: 0;
}

.page-faq .faq-strip__item dt {
  font-family: var(--font-serif);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--muted-slate);
}

.page-faq .faq-strip__item dd {
  margin: 9px 0 0;
  font-family: var(--font-mono);
  font-size: 1.02rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--paper-mist);
  word-break: break-word;
}

@media (min-width: 780px) {
  .page-faq .faq-strip__list {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
}

/* ---------- 主体两栏 ---------- */
.page-faq .faq-body {
  padding-top: clamp(40px, 6vw, 88px);
  display: grid;
  gap: clamp(28px, 4vw, 48px);
  grid-template-columns: minmax(0, 1fr);
}

.page-faq .faq-rail {
  border-top: 1px solid var(--grid-line);
  padding-top: 18px;
  min-width: 0;
}

.page-faq .faq-rail__title {
  margin: 0 0 14px;
  font-family: var(--font-serif);
  font-size: 0.8rem;
  letter-spacing: 0.2em;
  color: var(--muted-slate);
}

.page-faq .faq-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.page-faq .faq-rail__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 10px 9px 12px;
  border-left: 1px solid transparent;
  color: var(--muted-slate);
  text-decoration: none;
  font-size: 0.92rem;
  line-height: 1.5;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-faq .faq-rail__no {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--cyan-signal);
  flex: none;
}

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

.page-faq .faq-rail__link:hover {
  color: var(--paper-mist);
  border-left-color: var(--cyan-signal);
  background: var(--faq-signal-soft);
}

.page-faq .faq-rail__link:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
  color: var(--paper-mist);
}

.page-faq .faq-rail__note {
  margin: 16px 0 0;
  font-size: 0.8rem;
  line-height: 1.75;
  color: var(--muted-slate);
}

@media (min-width: 980px) {
  .page-faq .faq-body {
    grid-template-columns: var(--faq-rail) minmax(0, 1fr);
    gap: clamp(40px, 5vw, 88px);
  }

  .page-faq .faq-rail {
    position: sticky;
    top: 96px;
    align-self: start;
  }

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

/* ---------- 分组 ---------- */
.page-faq .faq-flow {
  min-width: 0;
}

.page-faq .faq-group {
  scroll-margin-top: 96px;
}

.page-faq .faq-group + .faq-group {
  margin-top: clamp(48px, 7vw, 104px);
}

.page-faq .faq-group .section-head {
  margin-bottom: clamp(20px, 2.6vw, 32px);
}

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

.page-faq .faq-item {
  border-bottom: 1px solid var(--grid-line);
  transition: background var(--dur) var(--ease);
}

.page-faq .faq-item[open] {
  background: linear-gradient(180deg, var(--faq-signal-soft), rgba(53, 224, 200, 0) 72%);
}

.page-faq .faq-item__q {
  display: flex;
  align-items: baseline;
  gap: 14px;
  position: relative;
  margin: 0;
  padding: 18px 34px 18px 2px;
  cursor: pointer;
  list-style: none;
  font-size: 1.02rem;
  font-weight: 700;
  line-height: 1.55;
  color: var(--paper-mist);
  transition: color var(--dur) var(--ease), background var(--dur) var(--ease);
}

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

.page-faq .faq-item__q::after {
  content: "+";
  position: absolute;
  right: 6px;
  top: 16px;
  font-family: var(--font-mono);
  font-size: 1.05rem;
  line-height: 1;
  color: var(--cyan-signal);
}

.page-faq .faq-item[open] .faq-item__q::after {
  content: "\2013";
}

.page-faq .faq-item[open] .faq-item__q {
  font-weight: 900;
}

.page-faq .faq-item__q:hover {
  background: var(--ink-layer);
}

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

.page-faq .faq-item__no {
  flex: none;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--cyan-signal);
}

.page-faq .faq-item__a {
  padding: 0 34px 24px 30px;
}

.page-faq .faq-item__a p {
  margin: 0;
  max-width: 68ch;
  font-size: 0.97rem;
  line-height: 1.85;
  color: var(--paper-mist);
}

.page-faq .faq-item__a a {
  color: var(--cyan-signal);
  text-decoration: none;
  border-bottom: 1px solid var(--grid-line);
  transition: border-color var(--dur) var(--ease);
}

.page-faq .faq-item__a a:hover,
.page-faq .faq-item__a a:focus-visible {
  border-bottom-color: var(--cyan-signal);
}

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

/* ---------- 角球弧线示意 ---------- */
.page-faq .faq-arc {
  display: block;
  width: min(100%, 300px);
  height: auto;
  margin: 20px 0 4px;
  overflow: visible;
}

.page-faq .faq-arc__rings path {
  fill: none;
  stroke: var(--grid-line);
  stroke-width: 1;
}

.page-faq .faq-arc__signal {
  fill: none;
  stroke: var(--cyan-signal);
  stroke-width: 1.6;
}

.page-faq .faq-arc__ticks line {
  stroke: var(--muted-slate);
  stroke-width: 1;
  stroke-dasharray: 2 5;
}

/* ---------- 号码索引分栏 ---------- */
.page-faq .faq-split {
  display: grid;
  gap: clamp(26px, 3.5vw, 46px);
  grid-template-columns: minmax(0, 1fr);
}

.page-faq .faq-lookup__figure {
  margin: 0;
  min-width: 0;
}

.page-faq .faq-lookup__figure .figure__frame {
  border: 1px solid var(--grid-line);
  background: var(--ink-layer);
  overflow: hidden;
  box-shadow: var(--shadow-soft);
}

@media (min-width: 1080px) {
  .page-faq .faq-split {
    grid-template-columns: minmax(0, 1fr) 292px;
    align-items: start;
  }
}

/* ---------- 纠错步骤 ---------- */
.page-faq .faq-steps {
  list-style: none;
  margin: 0 0 clamp(26px, 3.4vw, 42px);
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--grid-line);
  border: 1px solid var(--grid-line);
}

.page-faq .faq-steps li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 16px;
  align-items: baseline;
  padding: 16px 18px;
  background: var(--ink-base);
}

.page-faq .faq-steps__n {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--cyan-signal);
}

.page-faq .faq-steps p {
  margin: 0;
  max-width: 66ch;
  font-size: 0.94rem;
  line-height: 1.82;
  color: var(--paper-mist);
}

/* ---------- 术语表 ---------- */
.page-faq .faq-terms {
  margin: 0;
  border-top: 1px solid var(--grid-line);
}

.page-faq .faq-terms__row {
  display: grid;
  gap: 5px 28px;
  padding: 15px 0;
  border-bottom: 1px solid var(--grid-line);
}

.page-faq .faq-terms dt {
  font-family: var(--font-mono);
  font-size: 0.88rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--cyan-signal);
}

.page-faq .faq-terms dd {
  margin: 0;
  max-width: 70ch;
  font-size: 0.93rem;
  line-height: 1.8;
  color: var(--paper-mist);
}

@media (min-width: 720px) {
  .page-faq .faq-terms__row {
    grid-template-columns: 168px minmax(0, 1fr);
    align-items: baseline;
  }
}

.page-faq .faq-footnote {
  margin: clamp(24px, 3vw, 36px) 0 0;
  max-width: 78ch;
  padding-left: 14px;
  border-left: 1px solid var(--grid-line);
  font-size: 0.84rem;
  line-height: 1.85;
  color: var(--muted-slate);
}

/* ---------- 窄屏细节 ---------- */
@media (max-width: 560px) {
  .page-faq .faq-item__q {
    padding-right: 28px;
    font-size: 0.98rem;
  }

  .page-faq .faq-item__a {
    padding-left: 2px;
    padding-right: 6px;
  }

  .page-faq .faq-hero__hint,
  .page-faq .faq-rail__note {
    font-size: 0.82rem;
  }
}