.page-faq {
  --faq-gap: clamp(18px, 2.6vw, 30px);
  --faq-pad: clamp(18px, 2.4vw, 30px);
  background: var(--c-void);
  color: var(--c-text);
  padding-bottom: clamp(40px, 6vw, 88px);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  padding-top: clamp(20px, 4vw, 46px);
}

.page-faq .faq-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--faq-gap);
  margin-top: clamp(18px, 3vw, 28px);
  align-items: start;
}

.page-faq .faq-hero__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(30px, 6.4vw, 52px);
  line-height: 1.14;
  margin: 12px 0 0;
  letter-spacing: 0.01em;
}

.page-faq .faq-hero__lede {
  margin: 18px 0 0;
  color: var(--c-dim);
  line-height: 1.8;
  font-size: 1rem;
  max-width: 62ch;
}

.page-faq .faq-hero__chips {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
}

.page-faq .faq-hero__media {
  margin: 0;
}

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

/* ---------- 章节骨架 ---------- */
.page-faq .faq-section {
  margin-top: clamp(44px, 7vw, 88px);
  border-top: var(--edge) solid var(--c-line);
  padding-top: clamp(26px, 4vw, 46px);
}

.page-faq .faq-section__head {
  max-width: 70ch;
}

.page-faq .faq-section__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(22px, 3.6vw, 32px);
  line-height: 1.32;
  margin: 10px 0 0;
}

.page-faq .faq-section__lede {
  margin: 14px 0 0;
  color: var(--c-dim);
  line-height: 1.8;
}

/* ---------- 起步四步 ---------- */
.page-faq .faq-steps__list {
  list-style: none;
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--faq-gap);
}

.page-faq .faq-step {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 16px;
  border: var(--edge) solid var(--c-line);
  border-left: 4px solid var(--c-deep);
  background: var(--c-panel);
  padding: var(--faq-pad);
  transition: border-color var(--dur) ease, background-color var(--dur) ease;
}

.page-faq .faq-step:hover,
.page-faq .faq-step:focus-within {
  border-left-color: var(--c-pulse);
}

.page-faq .faq-step__no {
  font-family: var(--font-mono);
  font-size: 1.35rem;
  font-weight: 700;
  line-height: 1;
  color: var(--c-pulse);
  padding-top: 2px;
}

.page-faq .faq-step__title {
  font-family: var(--font-display);
  font-size: 1.08rem;
  font-weight: 700;
  margin: 0;
  line-height: 1.5;
}

.page-faq .faq-step__body p {
  margin: 10px 0 0;
  color: var(--c-dim);
  line-height: 1.75;
  font-size: 0.94rem;
}

.page-faq .faq-steps__media {
  margin: clamp(24px, 4vw, 40px) 0 0;
}

/* ---------- 分组标签 ---------- */
.page-faq .faq-tabs {
  margin-top: clamp(24px, 4vw, 38px);
}

.page-faq .faq-tabs__list {
  display: flex;
  flex-wrap: nowrap;
  gap: 0;
  overflow-x: auto;
  border-bottom: var(--edge) solid var(--c-line-strong);
  padding-bottom: 0;
  scrollbar-width: thin;
}

.page-faq .faq-tabpanel {
  padding-top: clamp(20px, 3vw, 30px);
}

.page-faq .faq-general {
  margin: 0 0 clamp(18px, 3vw, 26px);
  padding: 14px 18px;
  border-left: 4px solid var(--c-pulse);
  background: var(--c-rib);
  color: var(--c-text);
  line-height: 1.75;
  font-size: 0.96rem;
}

/* ---------- 问答手风琴 ---------- */
.page-faq .faq-q {
  border: var(--edge) solid var(--c-line);
  background: var(--c-panel);
  margin-top: 12px;
}

.page-faq .faq-q[open] {
  border-color: var(--c-line-strong);
}

.page-faq .faq-q__summary {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
  font-weight: 600;
  line-height: 1.65;
  transition: color var(--dur-fast) ease;
}

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

.page-faq .faq-q__summary:hover,
.page-faq .faq-q__summary:focus-visible {
  color: var(--c-pulse);
}

.page-faq .faq-q__no {
  flex: none;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  color: var(--c-pulse);
  padding-top: 5px;
}

.page-faq .faq-q__text {
  flex: 1 1 auto;
}

.page-faq .faq-q__mark {
  flex: none;
  position: relative;
  width: 18px;
  height: 18px;
  margin-top: 4px;
}

.page-faq .faq-q__mark::before,
.page-faq .faq-q__mark::after {
  content: "";
  position: absolute;
  background: var(--c-pulse);
}

.page-faq .faq-q__mark::before {
  left: 0;
  right: 0;
  top: 8px;
  height: 2px;
}

.page-faq .faq-q__mark::after {
  top: 0;
  bottom: 0;
  left: 8px;
  width: 2px;
  transition: transform var(--dur-fast) ease;
}

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

.page-faq .faq-q__body {
  padding: 0 clamp(18px, 3vw, 30px) 22px;
  border-top: 1px solid var(--c-line);
  margin-top: 2px;
}

.page-faq .faq-q__body p {
  margin: 16px 0 0;
  color: var(--c-dim);
  line-height: 1.85;
  max-width: 76ch;
}

.page-faq .faq-q__body a {
  color: var(--c-pulse);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 术语对照卡 ---------- */
.page-faq .faq-term-grid {
  list-style: none;
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--faq-gap);
}

.page-faq .faq-term {
  border: var(--edge) solid var(--c-line);
  border-top: 4px solid var(--c-deep);
  background: var(--c-panel);
  padding: var(--faq-pad);
  display: flex;
  flex-direction: column;
}

.page-faq .faq-term__name {
  font-family: var(--font-mono);
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--c-pulse);
  letter-spacing: 0.02em;
}

.page-faq .faq-term__def {
  margin: 12px 0 0;
  color: var(--c-text);
  line-height: 1.7;
  font-size: 0.94rem;
  flex: 1 1 auto;
}

.page-faq .faq-term__loc {
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px dashed var(--c-line-strong);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--c-dim);
  letter-spacing: 0.02em;
}

/* ---------- 口径差异 ---------- */
.page-faq .faq-scope__lanes {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--faq-gap);
  margin-top: clamp(24px, 4vw, 40px);
}

.page-faq .faq-scope__lane {
  border: var(--edge) solid var(--c-line);
  background: var(--c-panel);
  padding: var(--faq-pad);
  border-top: 4px solid var(--c-neon);
}

.page-faq .faq-scope__lane--narrow {
  border-top-color: var(--c-pulse);
}

.page-faq .faq-scope__label {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 1.18rem;
  font-weight: 700;
}

.page-faq .faq-scope__cond {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--c-dim);
  letter-spacing: 0.02em;
}

.page-faq .faq-scope__meter {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 6px;
  margin: 20px 0 0;
}

.page-faq .faq-scope__tick {
  height: 12px;
  background: var(--c-rib);
  border: 1px solid var(--c-line-strong);
}

.page-faq .faq-scope__tick.is-on {
  background: var(--c-pulse);
  border-color: var(--c-pulse);
}

.page-faq .faq-scope__lane--narrow .faq-scope__tick.is-on {
  background: var(--c-neon);
  border-color: var(--c-neon);
}

.page-faq .faq-scope__result {
  margin: 18px 0 0;
  color: var(--c-dim);
  line-height: 1.78;
  font-size: 0.94rem;
}

.page-faq .faq-scope__note {
  margin-top: clamp(20px, 3vw, 28px);
  padding-left: 16px;
  border-left: 2px solid var(--c-alert);
  color: var(--c-dim);
  line-height: 1.8;
  font-size: 0.9rem;
}

/* ---------- 勘误收尾 ---------- */
.page-faq .faq-errata__panel {
  border: var(--edge) solid var(--c-line-strong);
  background: var(--c-panel);
  padding: clamp(22px, 4vw, 40px);
  box-shadow: var(--shadow-stack);
}

.page-faq .faq-errata__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 28px);
}

.page-faq .faq-errata__note {
  margin: 18px 0 0;
  color: var(--c-mute);
  line-height: 1.75;
  font-size: 0.86rem;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-faq .faq-term-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 860px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: 6fr 5fr;
    gap: clamp(28px, 4vw, 56px);
  }

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

  .page-faq .faq-step {
    grid-template-columns: 1fr;
    gap: 12px;
    align-content: start;
  }

  .page-faq .faq-step__no {
    font-size: 1.6rem;
  }

  .page-faq .faq-scope__lanes {
    grid-template-columns: 5fr 4fr;
    gap: clamp(24px, 4vw, 44px);
  }

  .page-faq .faq-steps__media {
    margin-top: clamp(28px, 4vw, 48px);
  }
}

@media (min-width: 1080px) {
  .page-faq .faq-term-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-faq .faq-q__summary {
    padding: 18px 22px;
  }

  .page-faq .faq-q__body {
    padding-left: 22px;
    padding-right: 22px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-step,
  .page-faq .faq-q__summary,
  .page-faq .faq-q__mark::after {
    transition: none;
  }
}