.page-faq {
  --faq-rail-w: 232px;
  --faq-gap: clamp(26px, 4vw, 54px);
  display: block;
}

.page-faq .crumb {
  padding: clamp(18px, 3vw, 34px) 0 0;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  display: grid;
  gap: clamp(22px, 3vw, 40px);
  padding: clamp(26px, 5vw, 58px) 0 clamp(30px, 5vw, 64px);
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--nebula) 26%, var(--cygnus) 68%, transparent);
  opacity: 0.55;
}

@media (min-width: 900px) {
  .page-faq .faq-hero {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    align-items: end;
  }
}

.page-faq .faq-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-head);
  font-size: clamp(30px, 5.4vw, 54px);
  font-weight: 700;
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: var(--ink-white);
  max-width: 22ch;
}

.page-faq .faq-hero .lede {
  margin: 18px 0 0;
  max-width: 50ch;
}

.page-faq .faq-brief {
  border: 1px solid var(--ice-line);
  background: rgba(12, 18, 38, 0.62);
  padding: clamp(18px, 2.4vw, 24px);
  display: grid;
  gap: 14px;
  align-content: start;
}

.page-faq .faq-brief__kicker {
  margin: 0;
  font-family: var(--font-head);
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--star-mist);
}

.page-faq .faq-brief__facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 18px 26px;
}

.page-faq .faq-brief__facts li {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.page-faq .faq-brief__facts strong {
  font-family: var(--font-display);
  font-size: 34px;
  font-weight: 600;
  line-height: 1;
  color: var(--cygnus);
}

.page-faq .faq-brief__facts span {
  font-family: var(--font-head);
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--star-mist);
}

.page-faq .faq-brief__text {
  margin: 0;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.8;
  color: var(--star-mist);
}

.page-faq .faq-brief .btn {
  justify-self: start;
}

/* ---------- 分栏骨架 ---------- */
.page-faq .faq-body {
  display: grid;
  gap: var(--faq-gap);
  padding: clamp(34px, 5vw, 62px) 0 clamp(52px, 8vw, 104px);
}

@media (min-width: 980px) {
  .page-faq .faq-body {
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
    align-items: start;
  }
}

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

.page-faq .faq-rail__inner {
  display: grid;
  gap: 22px;
}

@media (min-width: 980px) {
  .page-faq .faq-rail__inner {
    position: sticky;
    top: 96px;
  }
}

.page-faq .faq-rail .toc__link {
  display: block;
}

.page-faq .faq-rail__block {
  border-top: 1px solid var(--ice-line);
  padding-top: 16px;
}

.page-faq .faq-rail__label {
  margin: 0 0 12px;
  font-family: var(--font-head);
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--star-mist);
}

.page-faq .faq-mini {
  list-style: none;
  margin: 0;
  padding: 0;
  border-left: 1px solid var(--ice-line);
}

.page-faq .faq-mini__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: center;
  gap: 12px;
  padding: 11px 0 11px 14px;
  border-bottom: 1px solid var(--ice-line);
}

.page-faq .faq-mini__num {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 600;
  line-height: 1;
  color: var(--nebula);
}

.page-faq .faq-mini__label {
  font-family: var(--font-head);
  font-size: 14px;
  letter-spacing: 0.06em;
  color: var(--ink-white);
}

.page-faq .faq-rail__note {
  margin: 0;
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.8;
  color: var(--star-mist);
}

/* ---------- 主栏章节 ---------- */
.page-faq .faq-main {
  display: grid;
  gap: clamp(44px, 6vw, 86px);
  min-width: 0;
}

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

.page-faq .faq-sec__head {
  border-top: 1px solid var(--ice-line);
  padding-top: 18px;
}

.page-faq .faq-sec__title {
  margin: 10px 0 0;
  font-family: var(--font-head);
  font-size: clamp(22px, 3vw, 32px);
  font-weight: 700;
  line-height: 1.26;
  letter-spacing: -0.01em;
  color: var(--ink-white);
}

.page-faq .faq-sec__lede {
  margin: 14px 0 0;
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.85;
  color: var(--star-mist);
  max-width: 62ch;
}

/* ---------- 三步流程 ---------- */
.page-faq .steps {
  list-style: none;
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0;
}

.page-faq .step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: clamp(14px, 2.4vw, 26px);
  padding: clamp(20px, 3vw, 30px) 0;
  border-top: 1px solid var(--ice-line);
}

.page-faq .step:last-child {
  border-bottom: 1px solid var(--ice-line);
}

.page-faq .step__num {
  font-family: var(--font-display);
  font-size: clamp(44px, 7vw, 64px);
  font-weight: 600;
  line-height: 0.86;
  letter-spacing: 0.02em;
  color: var(--cygnus);
  background-image: linear-gradient(155deg, var(--cygnus), var(--nebula));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.page-faq .step__title {
  margin: 0;
  font-family: var(--font-head);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--ink-white);
}

.page-faq .step__text {
  margin: 8px 0 0;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.85;
  color: var(--star-mist);
  max-width: 58ch;
}

.page-faq .faq-figure {
  margin: clamp(30px, 4vw, 46px) 0 0;
}

.page-faq .faq-figure .figure__media img {
  width: 100%;
  height: auto;
  display: block;
}

/* ---------- 问答 ---------- */
.page-faq .faq-split {
  margin: clamp(22px, 3vw, 32px) 0 0;
}

@media (min-width: 820px) {
  .page-faq .faq-split {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(170px, 24%);
    gap: clamp(22px, 3vw, 40px);
    align-items: start;
  }
}

.page-faq .qa-list {
  margin: clamp(22px, 3vw, 32px) 0 0;
}

.page-faq .faq-split .qa-list {
  margin: 0;
}

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

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

.page-faq .qa summary {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 18px 0 18px 20px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.55;
  color: var(--ink-white);
  transition: color var(--dur) var(--ease);
}

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

.page-faq .qa summary:hover {
  color: var(--cygnus);
}

.page-faq .qa summary::before {
  content: "";
  position: absolute;
  left: 0;
  top: 16px;
  bottom: 16px;
  width: 2px;
  background: var(--cygnus);
  transform: scaleY(0);
  transform-origin: top center;
  transition: transform var(--dur) var(--ease);
}

.page-faq .qa[open] summary::before {
  transform: scaleY(1);
}

.page-faq .qa summary::after {
  content: "+";
  margin-left: auto;
  flex: 0 0 auto;
  font-family: var(--font-display);
  font-size: 22px;
  line-height: 1;
  color: var(--cygnus);
}

.page-faq .qa[open] summary::after {
  content: "\2212";
}

.page-faq .qa__body {
  padding: 0 0 24px 20px;
  max-width: 66ch;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.85;
  color: var(--star-mist);
}

.page-faq .qa__body p {
  margin: 0 0 12px;
}

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

.page-faq .qa__body ul {
  margin: 10px 0 0;
  padding-left: 20px;
}

.page-faq .qa__body li {
  margin-bottom: 10px;
}

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

.page-faq .qa__body strong {
  color: var(--ink-white);
  font-weight: 700;
}

.page-faq .misread {
  display: inline-block;
  margin-right: 10px;
  padding: 3px 9px;
  border: 1px solid rgba(245, 184, 65, 0.5);
  border-radius: 2px;
  font-family: var(--font-head);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--amber);
  vertical-align: 1px;
}

.page-faq .faq-side .figure {
  margin: 0;
}

.page-faq .faq-side .figure__media img {
  width: 100%;
  height: auto;
  display: block;
}

.page-faq .faq-note {
  margin: clamp(22px, 3vw, 30px) 0 0;
  padding: 16px 20px;
  border-left: 2px solid var(--amber);
  background: rgba(245, 184, 65, 0.07);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.8;
  color: var(--star-mist);
  max-width: 68ch;
}

/* ---------- 术语表 ---------- */
.page-faq .glossary {
  display: grid;
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0;
  border-top: 1px solid var(--ice-line);
}

@media (min-width: 700px) {
  .page-faq .glossary {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(24px, 4vw, 48px);
  }
}

.page-faq .gloss {
  display: grid;
  gap: 7px;
  padding: 18px 0;
  border-bottom: 1px solid var(--ice-line);
  min-width: 0;
}

.page-faq .gloss__term {
  font-family: var(--font-head);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cygnus);
}

.page-faq .gloss__def {
  margin: 0;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.78;
  color: var(--star-mist);
}

.page-faq .faq-tail {
  margin: clamp(24px, 3vw, 34px) 0 0;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.85;
  color: var(--star-mist);
  max-width: 68ch;
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa summary::before {
    transition: none;
  }
}