.page-faq {
  --faq-rail-w: 260px;
  --faq-gap: clamp(20px, 3vw, 44px);
  display: block;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
  overflow-x: clip;
}

/* ---------- 面包屑 ---------- */
.page-faq .breadcrumbs {
  background: var(--ink-2);
  border-bottom: 1px solid var(--line);
}

.page-faq .breadcrumbs .wrap {
  display: flex;
  align-items: center;
  gap: 10px;
  padding-top: 14px;
  padding-bottom: 14px;
  font-size: 13px;
  color: var(--mute);
}

.page-faq .breadcrumbs a {
  color: var(--cyan);
  text-decoration: none;
  transition: color var(--t-fast) var(--ease);
}

.page-faq .breadcrumbs a:hover,
.page-faq .breadcrumbs a:focus-visible {
  color: var(--cyan-soft);
  text-decoration: underline;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(34px, 6vw, 76px) 0 clamp(36px, 5vw, 64px);
  background: var(--ink);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  top: -34%;
  right: -14%;
  width: min(720px, 96vw);
  aspect-ratio: 1 / 1;
  background: radial-gradient(circle at 50% 50%, rgba(53, 242, 208, .2), rgba(53, 242, 208, 0) 66%);
  z-index: -1;
  pointer-events: none;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  left: -20%;
  bottom: -48%;
  width: min(520px, 80vw);
  aspect-ratio: 1 / 1;
  background: radial-gradient(circle at 50% 50%, rgba(255, 61, 139, .14), rgba(255, 61, 139, 0) 68%);
  z-index: -1;
  pointer-events: none;
}

.page-faq .faq-hero__grid {
  display: grid;
  gap: clamp(26px, 4vw, 46px);
  align-items: center;
}

.page-faq .faq-hero h1 {
  margin: .35em 0 .55em;
  font-family: var(--font-display);
  font-size: clamp(30px, 4.4vw, 54px);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -.02em;
  color: var(--paper);
  overflow-wrap: break-word;
}

.page-faq .faq-hero__lede {
  max-width: 620px;
  margin: 0;
  font-size: 16px;
  line-height: 1.7;
  color: var(--mute);
}

.page-faq .faq-hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 18px clamp(24px, 4vw, 48px);
  margin: 28px 0 0;
  padding: 18px 0 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-faq .faq-hero__num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(22px, 2.6vw, 32px);
  line-height: 1.1;
  letter-spacing: -.01em;
  color: var(--cyan);
}

.page-faq .faq-hero__cap {
  display: block;
  margin-top: 5px;
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--mute);
}

.page-faq .faq-hero__media {
  position: relative;
  margin: 0;
  overflow: hidden;
  background: var(--ink-2);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-panel);
  clip-path: polygon(0 5%, 100% 0, 100% 95%, 0 100%);
}

.page-faq .faq-hero__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.9) contrast(1.06);
}

.page-faq .faq-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(5, 17, 13, 0) 42%, rgba(5, 17, 13, .58) 100%);
  pointer-events: none;
}

/* ---------- 主体骨架 ---------- */
.page-faq .faq-body {
  background: var(--ink);
}

.page-faq .faq-layout {
  display: grid;
  gap: var(--faq-gap);
  min-width: 0;
}

/* ---------- 左轨索引 ---------- */
.page-faq .faq-rail {
  position: relative;
  padding-left: 20px;
}

.page-faq .faq-rail::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 4px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--cyan), rgba(53, 242, 208, 0));
}

.page-faq .faq-rail__title {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--mute);
}

.page-faq .faq-rail__list {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 20px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-rail__link {
  display: flex;
  align-items: baseline;
  gap: 9px;
  padding: 6px 0;
  font-size: 14px;
  color: var(--mute);
  text-decoration: none;
  transition: color var(--t-fast) var(--ease), transform var(--t-fast) var(--ease);
}

.page-faq .faq-rail__link:hover,
.page-faq .faq-rail__link:focus-visible {
  color: var(--cyan-soft);
  transform: translateX(3px);
}

.page-faq .faq-rail__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--cyan);
}

/* ---------- 右轨问答流 ---------- */
.page-faq .faq-flow {
  display: grid;
  gap: clamp(40px, 5vw, 68px);
  min-width: 0;
}

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

.page-faq .faq-group__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-group__idx {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--cyan);
}

.page-faq .faq-group__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(20px, 2.4vw, 28px);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-faq .faq-group__lede {
  max-width: 640px;
  margin: 16px 0 6px;
  font-size: 15px;
  line-height: 1.65;
  color: var(--mute);
}

.page-faq .faq-list {
  margin-top: 6px;
}

/* ---------- 可展开问答行 ---------- */
.page-faq .qa {
  border-bottom: 1px solid var(--line);
}

.page-faq .qa__q {
  position: relative;
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 18px 44px 18px 0;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--paper);
  cursor: pointer;
  list-style: none;
  transition: color var(--t-fast) var(--ease);
}

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

.page-faq .qa__q::after {
  content: "";
  position: absolute;
  right: 10px;
  top: 26px;
  width: 11px;
  height: 11px;
  border-right: 2px solid var(--mute);
  border-bottom: 2px solid var(--mute);
  transform: rotate(45deg);
  transition: transform var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}

.page-faq .qa__q:hover {
  color: var(--cyan-soft);
}

.page-faq .qa__q:hover::after {
  border-color: var(--cyan-soft);
}

.page-faq .qa__q:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 4px;
}

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

.page-faq .qa[open] .qa__q::after {
  transform: rotate(-135deg);
  border-color: var(--cyan);
}

.page-faq .qa__idx {
  flex: 0 0 auto;
  padding-top: 4px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--cyan);
}

.page-faq .qa__a {
  margin: 0 0 20px;
  padding: 18px 20px 20px;
  border-left: 2px solid var(--cyan);
  border-radius: 0 var(--radius-organic) var(--radius-organic) 0;
  background: linear-gradient(100deg, rgba(30, 64, 52, .92), rgba(16, 36, 29, .68));
  font-size: 15px;
  line-height: 1.75;
  color: var(--paper);
}

.page-faq .qa__a p {
  margin: 0;
  max-width: 660px;
}

.page-faq .qa__a p + p {
  margin-top: 12px;
}

.page-faq .qa__a a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color var(--t-fast) var(--ease);
}

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

.page-faq .qa__figure {
  margin: 16px 0 0;
  overflow: hidden;
  max-width: 520px;
  border: 1px solid var(--line);
  background: var(--ink-2);
}

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

/* ---------- 展开区内的示意标签 ---------- */
.page-faq .faq-demo {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px dashed var(--line);
}

.page-faq .faq-demo__label {
  margin-right: 4px;
  font-size: 12px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--mute);
}

.page-faq .faq-demo .chip {
  cursor: pointer;
  transition: background var(--t-fast) var(--ease), color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}

.page-faq .faq-demo .chip:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-faq .faq-demo .chip.is-active {
  background: var(--turf);
  border-color: var(--cyan);
  color: var(--cyan-soft);
}

/* ---------- 收尾 ---------- */
.page-faq .faq-cta {
  background: var(--ink-2);
  border-top: 1px solid var(--line);
}

.page-faq .faq-cta__inner {
  display: grid;
  gap: 22px;
  align-items: center;
  padding: clamp(22px, 3vw, 36px);
  border: 1px solid var(--line);
  border-radius: var(--radius-organic);
  background:
    linear-gradient(120deg, rgba(30, 64, 52, .55) 0%, rgba(16, 36, 29, .85) 48%, rgba(5, 17, 13, .95) 100%);
}

.page-faq .faq-cta h2 {
  margin: .3em 0 .5em;
  font-family: var(--font-display);
  font-size: clamp(21px, 2.6vw, 30px);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-faq .faq-cta__copy p {
  max-width: 620px;
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--mute);
}

.page-faq .faq-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-faq .faq-cta__actions .btn {
  white-space: nowrap;
}

/* ---------- 响应式 ---------- */
@media (min-width: 680px) {
  .page-faq .faq-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
  }
}

@media (min-width: 980px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr);
  }
}

@media (min-width: 1024px) {
  .page-faq .faq-layout {
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
    align-items: start;
  }

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

  .page-faq .faq-rail__list {
    flex-direction: column;
    gap: 2px;
  }

  .page-faq .qa__q {
    font-size: 17px;
  }
}

@media (max-width: 420px) {
  .page-faq .faq-hero__num {
    font-size: 22px;
  }

  .page-faq .qa__q {
    gap: 10px;
    padding-right: 34px;
    font-size: 16px;
  }

  .page-faq .qa__a {
    padding: 16px 14px 18px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa__q,
  .page-faq .qa__q::after,
  .page-faq .faq-rail__link,
  .page-faq .faq-demo .chip {
    transition: none;
  }
}