.page-faq {
  --faq-rail-w: 244px;
  --faq-gap: 48px;
  padding-bottom: 96px;
}

/* ---------- 面包屑 ---------- */
.page-faq .faq-crumbs {
  padding-top: 28px;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  padding: 20px 0 4px;
}

.page-faq .faq-hero h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 6.6vw, 56px);
  line-height: 1.08;
  letter-spacing: -0.025em;
  color: var(--paper);
  margin: 16px 0 0;
}

.page-faq .faq-hero__lead {
  margin: 20px 0 0;
  max-width: 40rem;
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--paper-dim);
}

.page-faq .faq-hero__note {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 10px;
  margin: 24px 0 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--haze);
}

.page-faq .faq-hero__num {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--amber);
}

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

/* ---------- 分组跳转 ---------- */
.page-faq .faq-jump {
  margin-top: 34px;
}

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

.page-faq .faq-jump__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 16px;
  border: 1px solid var(--steel);
  border-radius: 999px;
  background: var(--board);
  color: var(--paper-dim);
  font-size: 14px;
  line-height: 1.2;
  text-decoration: none;
  transition: border-color 0.22s var(--ease-out), color 0.22s var(--ease-out),
    transform 0.22s var(--ease-out);
}

.page-faq .faq-jump__link b {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--haze);
}

.page-faq .faq-jump__link:hover,
.page-faq .faq-jump__link:focus-visible {
  border-color: var(--cyan);
  color: var(--cyan);
  transform: translateY(-2px);
}

.page-faq .faq-jump__link:hover b,
.page-faq .faq-jump__link:focus-visible b {
  color: var(--cyan);
}

/* ---------- 分组骨架 ---------- */
.page-faq .faq-group {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  padding: 44px 0 4px;
  margin-top: 34px;
  border-top: 1px solid var(--steel);
  scroll-margin-top: calc(var(--shell-top) + 24px);
}

.page-faq .faq-group__rail .chapter__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 40px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: transparent;
  -webkit-text-stroke: 1.4px rgba(126, 147, 168, 0.75);
  margin-bottom: 10px;
}

.page-faq .faq-group__rain .chapter__title,
.page-faq .faq-group__rail .chapter__title {
  margin: 0;
}

.page-faq .faq-group__hint {
  margin: 10px 0 14px;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--haze);
  max-width: 20rem;
}

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

/* ---------- 三步上手 ---------- */
.page-faq .faq-steps {
  display: grid;
  gap: 14px;
  margin: 0 0 26px;
  padding: 0;
  list-style: none;
}

.page-faq .faq-step {
  position: relative;
  padding: 22px 20px;
  border: 1px solid var(--steel);
  border-radius: var(--radius-md);
  background: var(--board);
  overflow: hidden;
}

.page-faq .faq-step::after {
  content: "";
  position: absolute;
  right: -28px;
  bottom: -28px;
  width: 88px;
  height: 88px;
  border: 1px solid rgba(34, 240, 220, 0.16);
  border-radius: 50%;
}

.page-faq .faq-step__n {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-faq .faq-step__t {
  margin: 10px 0 10px;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 800;
  line-height: 1.35;
  color: var(--paper);
}

.page-faq .faq-step p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--haze);
}

/* ---------- 问答条目 ---------- */
.page-faq .qa {
  border-bottom: 1px solid var(--steel);
  border-left: 2px solid transparent;
  padding-left: 14px;
  transition: border-left-color 0.25s var(--ease-out);
}

.page-faq .qa[open] {
  border-left-color: var(--cyan);
}

.page-faq .qa__q {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 20px 0;
  list-style: none;
  cursor: pointer;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--paper);
  transition: color 0.2s var(--ease-out);
}

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

.page-faq .qa__q:hover,
.page-faq .qa__q:focus-visible {
  color: var(--cyan);
}

.page-faq .qa__idx {
  flex: 0 0 auto;
  padding-top: 5px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--haze);
}

.page-faq .qa__text {
  flex: 1 1 auto;
  min-width: 0;
}

.page-faq .qa__mark {
  flex: 0 0 auto;
  position: relative;
  width: 22px;
  height: 22px;
  margin-top: 3px;
  border: 1px solid var(--steel);
  border-radius: 50%;
  transition: border-color 0.22s var(--ease-out), background-color 0.22s var(--ease-out);
}

.page-faq .qa__mark::before,
.page-faq .qa__mark::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  background: var(--haze);
  transform: translate(-50%, -50%);
  transition: transform 0.25s var(--ease-out), background-color 0.22s var(--ease-out);
}

.page-faq .qa__mark::before {
  width: 10px;
  height: 1.5px;
}

.page-faq .qa__mark::after {
  width: 1.5px;
  height: 10px;
}

.page-faq .qa[open] .qa__mark {
  border-color: var(--cyan);
}

.page-faq .qa[open] .qa__mark::before,
.page-faq .qa[open] .qa__mark::after {
  background: var(--cyan);
}

.page-faq .qa[open] .qa__mark::after {
  transform: translate(-50%, -50%) scaleY(0);
}

.page-faq .qa__a {
  padding: 0 0 24px;
}

.page-faq .qa__a p {
  margin: 0 0 10px;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--paper-dim);
}

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

.page-faq .qa__a strong {
  color: var(--paper);
  font-weight: 700;
}

/* ---------- 章节配图 ---------- */
.page-faq .faq-figure {
  margin: 0 0 24px;
}

/* ---------- 全宽横幅 ---------- */
.page-faq .faq-banner-wrap {
  margin-top: 56px;
}

.page-faq .faq-banner {
  border-radius: var(--radius-lg);
}

/* ---------- 人工支持 ---------- */
.page-faq .faq-channels {
  display: grid;
  gap: 14px;
}

.page-faq .faq-channel {
  padding: 24px 22px;
  border-radius: var(--radius-md);
  background: var(--paper);
  color: var(--ink);
}

.page-faq .faq-channel__t {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 800;
  line-height: 1.4;
  color: var(--ink);
}

.page-faq .faq-channel p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: rgba(5, 10, 18, 0.76);
}

.page-faq .faq-support__note {
  margin: 22px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--haze);
}

.page-faq .faq-support__note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(34, 240, 220, 0.4);
  padding-bottom: 1px;
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-faq .faq-steps {
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
  }

  .page-faq .qa__a {
    padding-left: 54px;
  }

  .page-faq .faq-channels {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero {
    grid-template-columns: 1.08fr 0.92fr;
    align-items: center;
    gap: 52px;
    padding: 44px 0 8px;
  }

  .page-faq .faq-hero__figure {
    transform: translateY(14px);
  }

  .page-faq .faq-group {
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
    gap: var(--faq-gap);
    padding: 70px 0 12px;
    margin-top: 48px;
  }

  .page-faq .faq-group__rail {
    position: sticky;
    top: calc(var(--shell-top) + 36px);
    align-self: start;
  }

  .page-faq .faq-group__rail .chapter__num {
    font-size: 56px;
  }

  .page-faq .faq-channels {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-jump__link,
  .page-faq .qa,
  .page-faq .qa__q,
  .page-faq .qa__mark,
  .page-faq .qa__mark::before,
  .page-faq .qa__mark::after {
    transition: none;
  }

  .page-faq .faq-hero__figure {
    transform: none;
  }
}