.page-faq {
  --faq-rail: 236px;
  --faq-line: rgba(61, 245, 198, .22);
  --faq-card: linear-gradient(160deg, #163A31 0%, #12312A 100%);
  --faq-soft: rgba(22, 58, 49, .74);
  background: linear-gradient(180deg, var(--by-ink) 0%, var(--by-ink-deep) 100%);
  color: var(--by-text);
  font-family: var(--by-font-body);
  font-size: 15px;
  line-height: 1.7;
  padding-bottom: clamp(2.6rem, 7vw, 5rem);
}

.page-faq a:focus-visible,
.page-faq summary:focus-visible {
  outline: 2px solid var(--by-neon);
  outline-offset: 2px;
  border-radius: 6px;
}

/* ---------- 面包屑 ---------- */
.page-faq .faq-crumbs {
  padding-top: clamp(1rem, 3vw, 1.7rem);
  font-family: var(--by-font-mono);
  font-size: .78rem;
  letter-spacing: .05em;
  color: var(--by-muted);
}
.page-faq .faq-crumbs .by-crumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .45rem;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-faq .faq-crumbs .by-crumbs__link {
  color: var(--by-muted);
  text-decoration: none;
  transition: color .18s ease;
}
.page-faq .faq-crumbs .by-crumbs__link:hover {
  color: var(--by-neon);
}
.page-faq .faq-crumbs .by-crumbs__sep {
  color: rgba(155, 179, 170, .55);
}
.page-faq .faq-crumbs .by-crumbs__item[aria-current="page"] {
  color: var(--by-neon);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(1.3rem, 4vw, 2.4rem) 0 clamp(1.8rem, 5vw, 3rem);
}
.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  top: -28%;
  right: -12%;
  width: min(640px, 82vw);
  height: min(640px, 82vw);
  border-radius: 50%;
  background: radial-gradient(circle at 50% 50%, rgba(61, 245, 198, .16), rgba(61, 245, 198, 0) 68%);
  pointer-events: none;
}
.page-faq .faq-hero__inner {
  position: relative;
  display: grid;
  gap: clamp(1.4rem, 3.4vw, 2.6rem);
}
@media (min-width: 900px) {
  .page-faq .faq-hero__inner {
    grid-template-columns: minmax(0, 1.25fr) minmax(240px, .75fr);
    align-items: end;
  }
}
.page-faq .faq-kicker {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  margin: 0 0 .9rem;
  padding: .32rem .78rem;
  border: 1px solid var(--faq-line);
  border-radius: 999px;
  background: rgba(61, 245, 198, .06);
  font-family: var(--by-font-mono);
  font-size: .74rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--by-neon);
}
.page-faq .faq-kicker__dot {
  width: .45rem;
  height: .45rem;
  border-radius: 50%;
  background: var(--by-live);
  box-shadow: 0 0 0 3px rgba(255, 92, 92, .16);
}
.page-faq .faq-hero__title {
  margin: 0 0 .9rem;
  font-family: var(--by-font-display);
  font-weight: 700;
  font-size: clamp(2.1rem, 5.4vw, 3.35rem);
  line-height: 1.08;
  letter-spacing: .01em;
}
.page-faq .faq-hero__lead {
  max-width: 48ch;
  margin: 0 0 1.4rem;
  font-size: 1rem;
  line-height: 1.78;
  color: var(--by-text);
}
.page-faq .faq-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
}
.page-faq .faq-hero__panel {
  border: 1px solid var(--by-edge);
  border-radius: var(--by-radius);
  background: var(--faq-card);
  box-shadow: var(--by-shadow);
  padding: 1.1rem 1.15rem;
}
.page-faq .faq-stats {
  margin: 0;
  display: grid;
}
.page-faq .faq-stats__row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  padding: .58rem 0;
  border-bottom: 1px dashed rgba(31, 74, 63, .95);
}
.page-faq .faq-stats__row:last-child {
  border-bottom: 0;
}
.page-faq .faq-stats dt {
  margin: 0;
  font-family: var(--by-font-mono);
  font-size: .72rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--by-muted);
}
.page-faq .faq-stats dd {
  margin: 0;
  font-family: var(--by-font-mono);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--by-neon);
  text-shadow: 0 0 14px rgba(61, 245, 198, .32);
}

/* ---------- 正文骨架 ---------- */
.page-faq .faq-body {
  padding-top: clamp(.5rem, 2vw, 1.2rem);
}
.page-faq .faq-body__grid {
  display: grid;
  gap: clamp(1.4rem, 3.6vw, 2.4rem);
}
@media (min-width: 1024px) {
  .page-faq .faq-body__grid {
    grid-template-columns: var(--faq-rail) minmax(0, 1fr);
    align-items: start;
  }
}

/* ---------- 步骤索引 ---------- */
.page-faq .faq-rail {
  position: relative;
}
@media (min-width: 1024px) {
  .page-faq .faq-rail {
    position: sticky;
    top: 96px;
  }
}
.page-faq .faq-rail__title {
  margin: 0 0 .7rem;
  font-family: var(--by-font-mono);
  font-size: .72rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--by-muted);
}
.page-faq .faq-rail__list {
  display: flex;
  gap: .5rem;
  margin: 0 0 1rem;
  padding: 0 0 .45rem;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}
@media (min-width: 1024px) {
  .page-faq .faq-rail__list {
    display: grid;
    gap: .2rem;
    overflow: visible;
    padding: 0;
  }
}
.page-faq .faq-rail__link {
  display: flex;
  align-items: center;
  gap: .55rem;
  padding: .5rem .7rem;
  border: 1px solid var(--by-edge);
  border-radius: 10px;
  color: var(--by-muted);
  font-size: .9rem;
  white-space: nowrap;
  text-decoration: none;
  transition: background .18s ease, color .18s ease, border-color .18s ease;
}
@media (min-width: 1024px) {
  .page-faq .faq-rail__link {
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0 10px 10px 0;
    white-space: normal;
  }
}
.page-faq .faq-rail__link:hover,
.page-faq .faq-rail__link:focus-visible {
  color: var(--by-text);
  border-color: rgba(61, 245, 198, .55);
  background: rgba(61, 245, 198, .07);
}
.page-faq .faq-rail__num {
  font-family: var(--by-font-mono);
  font-size: .76rem;
  font-weight: 700;
  color: var(--by-neon);
}
.page-faq .faq-rail__help {
  display: none;
  font-family: var(--by-font-mono);
  font-size: .74rem;
  letter-spacing: .04em;
  color: var(--by-muted);
  text-decoration: none;
  border-bottom: 1px dashed rgba(155, 179, 170, .45);
  padding-bottom: .15rem;
}
@media (min-width: 1024px) {
  .page-faq .faq-rail__help {
    display: inline-block;
  }
}
.page-faq .faq-rail__help:hover {
  color: var(--by-neon);
  border-bottom-color: var(--by-neon);
}

/* ---------- 步骤卡片 ---------- */
.page-faq .faq-steps {
  display: grid;
  gap: clamp(1rem, 2.6vw, 1.6rem);
}
.page-faq .faq-step {
  position: relative;
  scroll-margin-top: 92px;
  border: 1px solid var(--by-edge);
  border-radius: var(--by-radius);
  background: var(--faq-card);
  box-shadow: var(--by-shadow);
  padding: clamp(1.15rem, 3vw, 1.85rem);
  overflow: hidden;
}
.page-faq .faq-step::before {
  content: "";
  position: absolute;
  inset: 0 auto auto 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--by-neon), rgba(61, 245, 198, 0) 72%);
  opacity: .72;
}
.page-faq .faq-step__head {
  display: flex;
  align-items: baseline;
  gap: .75rem;
  margin-bottom: .65rem;
}
.page-faq .faq-step__num {
  flex: none;
  font-family: var(--by-font-mono);
  font-size: 1.45rem;
  font-weight: 700;
  line-height: 1;
  color: var(--by-neon);
  text-shadow: 0 0 18px rgba(61, 245, 198, .35);
}
.page-faq .faq-step__title {
  margin: 0;
  font-family: var(--by-font-display);
  font-weight: 700;
  font-size: clamp(1.22rem, 2.6vw, 1.58rem);
  line-height: 1.3;
  letter-spacing: .01em;
  color: var(--by-text);
}
.page-faq .faq-step__lead {
  margin: 0 0 .9rem;
  color: var(--by-text);
  line-height: 1.75;
}
.page-faq .faq-tips {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: .6rem;
}
.page-faq .faq-tips li {
  position: relative;
  padding-left: 1.25rem;
  color: var(--by-text);
  line-height: 1.72;
}
.page-faq .faq-tips li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .68em;
  width: .42rem;
  height: .42rem;
  border-radius: 2px;
  background: var(--by-neon);
  opacity: .85;
}
.page-faq .faq-tips a {
  color: var(--by-neon);
  text-decoration: none;
  border-bottom: 1px solid rgba(61, 245, 198, .4);
}
.page-faq .faq-tips a:hover {
  border-bottom-color: var(--by-neon);
}
.page-faq .faq-em {
  font-family: var(--by-font-mono);
  font-weight: 700;
  color: var(--by-neon);
}
.page-faq .faq-goal {
  font-weight: 700;
  color: var(--by-goal);
}
.page-faq .faq-concede {
  font-weight: 700;
  color: var(--by-concede);
}

/* ---------- 图文分栏 ---------- */
.page-faq .faq-split {
  display: grid;
  gap: clamp(1rem, 2.6vw, 1.7rem);
}
@media (min-width: 760px) {
  .page-faq .faq-split--media {
    grid-template-columns: minmax(0, 1.32fr) minmax(0, .68fr);
    align-items: start;
  }
  .page-faq .faq-split--media-rev {
    grid-template-columns: minmax(0, .68fr) minmax(0, 1.32fr);
    align-items: start;
  }
}
.page-faq .faq-figure {
  margin: 0;
}
.page-faq .faq-figure__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--by-edge);
  border-radius: 12px;
  background: var(--by-panel);
}
.page-faq .faq-figure--tall .faq-figure__img {
  max-width: 340px;
  margin: 0 auto;
}
.page-faq .faq-figure__cap {
  margin: .6rem 0 0;
  font-family: var(--by-font-mono);
  font-size: .72rem;
  letter-spacing: .03em;
  line-height: 1.65;
  color: var(--by-muted);
}
.page-faq .faq-figure--tall .faq-figure__cap {
  text-align: center;
  max-width: 340px;
  margin-left: auto;
  margin-right: auto;
}

/* ---------- 常见问题 ---------- */
.page-faq .faq-qa {
  margin-top: clamp(2rem, 5vw, 3.2rem);
}
.page-faq .faq-qa__head {
  display: grid;
  gap: .35rem;
  margin-bottom: clamp(1rem, 2.6vw, 1.6rem);
}
.page-faq .faq-qa__index {
  font-family: var(--by-font-mono);
  font-size: .72rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--by-neon);
}
.page-faq .faq-qa__title {
  margin: 0;
  font-family: var(--by-font-display);
  font-weight: 700;
  font-size: clamp(1.5rem, 3.2vw, 2.1rem);
  line-height: 1.2;
  color: var(--by-text);
}
.page-faq .faq-qa__list {
  display: grid;
  gap: .6rem;
}
@media (min-width: 900px) {
  .page-faq .faq-qa__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: .7rem 1rem;
  }
}
.page-faq .faq-q {
  border: 1px solid var(--by-edge);
  border-radius: 12px;
  background: var(--faq-soft);
  overflow: hidden;
  transition: border-color .18s ease, background .18s ease;
}
.page-faq .faq-q[open] {
  border-color: rgba(61, 245, 198, .45);
  background: rgba(22, 58, 49, .96);
}
.page-faq .faq-q__q {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: .95rem 1.1rem;
  cursor: pointer;
  list-style: none;
  font-weight: 600;
  color: var(--by-text);
}
.page-faq .faq-q__q::-webkit-details-marker {
  display: none;
}
.page-faq .faq-q__q::after {
  content: "+";
  flex: none;
  font-family: var(--by-font-mono);
  font-size: 1.1rem;
  line-height: 1;
  color: var(--by-neon);
}
.page-faq .faq-q[open] .faq-q__q::after {
  content: "−";
}
.page-faq .faq-q__a {
  margin: 0;
  padding: 0 1.1rem 1.05rem;
  font-size: .94rem;
  line-height: 1.75;
  color: var(--by-muted);
}

/* ---------- 下一步 ---------- */
.page-faq .faq-next {
  margin-top: clamp(2.2rem, 5vw, 3.4rem);
}
.page-faq .faq-next__title {
  margin: 0 0 1rem;
  font-family: var(--by-font-mono);
  font-size: .74rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--by-muted);
}
.page-faq .faq-next__list {
  display: grid;
  gap: .7rem;
  margin: 0;
  padding: 0;
  list-style: none;
}
@media (min-width: 760px) {
  .page-faq .faq-next__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}
@media (min-width: 1080px) {
  .page-faq .faq-next__list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}
.page-faq .faq-next__link {
  display: flex;
  flex-direction: column;
  gap: .35rem;
  height: 100%;
  padding: 1rem 1.05rem;
  border: 1px solid var(--by-edge);
  border-radius: 12px;
  background: rgba(22, 58, 49, .55);
  text-decoration: none;
  transition: transform .2s ease, border-color .2s ease, background .2s ease;
}
.page-faq .faq-next__link:hover,
.page-faq .faq-next__link:focus-visible {
  transform: translateY(-3px);
  border-color: rgba(61, 245, 198, .5);
  background: rgba(22, 58, 49, .92);
}
.page-faq .faq-next__label {
  font-family: var(--by-font-display);
  font-size: 1.14rem;
  font-weight: 700;
  color: var(--by-neon);
  letter-spacing: .01em;
}
.page-faq .faq-next__desc {
  font-size: .86rem;
  line-height: 1.65;
  color: var(--by-muted);
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-next__link,
  .page-faq .faq-rail__link,
  .page-faq .faq-q {
    transition: none;
  }
  .page-faq .faq-next__link:hover,
  .page-faq .faq-next__link:focus-visible {
    transform: none;
  }
}
<<<END>>>