.page-faq {
  --faq-rail: 248px;
  --faq-gap: clamp(22px, 3.6vw, 52px);
  --faq-text: #C6DAD3;
  --faq-dim: #8FA9A1;

  display: block;
  background: var(--ink);
  color: var(--mist);
  font-family: var(--font-body);
  overflow-wrap: break-word;
  padding-bottom: clamp(48px, 8vw, 110px);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(24px, 4.2vw, 58px) 0 clamp(34px, 6vw, 80px);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(90% 120% at 88% -10%, rgba(56, 242, 208, 0.16), transparent 62%),
    linear-gradient(178deg, var(--forest) 0%, var(--forest) 45%, var(--ink) 100%);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(143, 169, 161, 0.1) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(143, 169, 161, 0.1) 1px, transparent 1px);
  background-size: 56px 56px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.85), transparent 78%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.85), transparent 78%);
}

.page-faq .faq-hero-grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  align-items: center;
}

.page-faq .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 clamp(16px, 2.2vw, 28px);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--faq-dim);
}

.page-faq .breadcrumbs a {
  color: var(--faq-dim);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
}

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

.page-faq .breadcrumbs [aria-current="page"] {
  color: var(--mist);
}

.page-faq .faq-kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-faq .faq-kicker::before {
  content: "";
  width: 24px;
  height: 1px;
  background: var(--cyan);
}

.page-faq h1 {
  margin: 0 0 clamp(14px, 2vw, 22px);
  max-width: 20ch;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.9rem, 5.2vw, 3.5rem);
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--mist);
  text-wrap: balance;
}

.page-faq .faq-lede {
  margin: 0;
  max-width: 58ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.82;
  color: var(--faq-text);
}

.page-faq .faq-index {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  width: fit-content;
  margin-top: clamp(20px, 3vw, 34px);
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  background: rgba(23, 59, 51, 0.6);
}

.page-faq .faq-index-step {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: var(--r-pill);
  font-size: 13px;
  color: var(--mist);
  text-decoration: none;
  transition: background var(--dur-fast) ease, color var(--dur-fast) ease;
}

.page-faq .faq-index-step:hover,
.page-faq .faq-index-step:focus-visible {
  background: rgba(56, 242, 208, 0.14);
  color: var(--cyan);
}

.page-faq .faq-index-step.is-current {
  background: var(--cyan);
  color: #06231D;
  font-weight: 700;
}

.page-faq .faq-index-num {
  font-family: var(--font-mono);
  font-size: 11px;
  opacity: 0.72;
}

.page-faq .faq-index-sep {
  width: 1px;
  height: 15px;
  background: var(--line);
}

.page-faq .faq-hero-visual {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--r-l);
  background: var(--forest-lift);
  box-shadow: 0 26px 60px -32px rgba(0, 0, 0, 0.95);
}

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

/* ---------- 主体双栏 ---------- */
.page-faq .faq-body {
  display: grid;
  gap: var(--faq-gap);
  padding-top: clamp(30px, 5vw, 68px);
}

.page-faq .faq-rail {
  align-self: start;
}

.page-faq .rail-title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--faq-dim);
}

.page-faq .rail-list {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: max-content;
  gap: 6px;
  margin: 0 0 20px;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-faq .rail-list::-webkit-scrollbar {
  display: none;
}

.page-faq .rail-list a {
  display: inline-flex;
  align-items: center;
  padding: 9px 14px;
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  background: var(--forest);
  color: var(--mist);
  font-size: 13px;
  white-space: nowrap;
  text-decoration: none;
  transition: color var(--dur-fast) ease, border-color var(--dur-fast) ease, background var(--dur-fast) ease;
}

.page-faq .rail-list a:hover,
.page-faq .rail-list a:focus-visible {
  border-color: var(--cyan);
  color: var(--cyan);
  background: rgba(56, 242, 208, 0.1);
}

.page-faq .rail-card {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--r-l);
  background: linear-gradient(160deg, var(--forest-lift), var(--forest));
}

.page-faq .rail-card p {
  margin: 0 0 10px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--faq-text);
}

.page-faq .rail-card .rail-card-label {
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--amber);
}

.page-faq .rail-btn {
  margin-top: 4px;
  font-size: 13px;
}

/* ---------- 问答流 ---------- */
.page-faq .faq-flow {
  display: grid;
  gap: clamp(34px, 5vw, 62px);
  min-width: 0;
}

.page-faq .faq-block {
  position: relative;
  padding-top: clamp(20px, 3vw, 30px);
  border-top: 1px solid var(--line);
  scroll-margin-top: 96px;
}

.page-faq .faq-block::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 62px;
  height: 2px;
  background: var(--cyan);
  border-radius: 2px;
}

.page-faq .block-head {
  margin-bottom: clamp(16px, 2.4vw, 24px);
}

.page-faq .block-title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.35rem, 2.5vw, 2rem);
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--mist);
}

.page-faq .block-lede {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.82;
  color: var(--faq-text);
}

/* ---------- 图 ---------- */
.page-faq .faq-figure {
  margin: 0 0 clamp(16px, 2.4vw, 24px);
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--r-m);
  background: var(--forest-lift);
}

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

.page-faq .faq-figure figcaption {
  padding: 10px 14px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.02em;
  color: var(--faq-dim);
}

/* ---------- 问答条目 ---------- */
.page-faq .qa {
  margin-bottom: 10px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--r-m);
  background: var(--forest);
  transition: border-color var(--dur-fast) ease, background var(--dur-fast) ease;
}

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

.page-faq .qa:hover {
  border-color: #2C7A69;
}

.page-faq .qa[open] {
  border-color: #2F8171;
  background: var(--forest-lift);
}

.page-faq .qa summary {
  position: relative;
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: clamp(13px, 2vw, 18px) clamp(14px, 2vw, 20px);
  list-style: none;
  cursor: pointer;
  transition: box-shadow var(--dur-fast) ease;
}

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

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

.page-faq .qa[open] summary {
  box-shadow: inset 3px 0 0 var(--cyan);
}

.page-faq .qa-num {
  flex: none;
  padding-top: 2px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.9;
  letter-spacing: 0.04em;
  color: var(--faq-dim);
  transition: color var(--dur-fast) ease;
}

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

.page-faq .qa-q {
  flex: 1 1 auto;
  min-width: 0;
  font-size: clamp(15px, 1.6vw, 16.5px);
  font-weight: 700;
  line-height: 1.62;
  letter-spacing: -0.005em;
  color: var(--mist);
}

.page-faq .qa summary::after {
  content: "";
  flex: none;
  width: 11px;
  height: 11px;
  margin-top: 5px;
  border-right: 2px solid var(--faq-dim);
  border-bottom: 2px solid var(--faq-dim);
  transform: rotate(45deg);
  transition: transform var(--dur) ease, border-color var(--dur) ease;
}

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

.page-faq .qa-a {
  padding: 0 clamp(14px, 2vw, 20px) clamp(16px, 2.4vw, 22px);
}

.page-faq .qa-a::before {
  content: "";
  display: block;
  height: 1px;
  margin-bottom: 14px;
  background: linear-gradient(90deg, rgba(56, 242, 208, 0.5), rgba(56, 242, 208, 0));
}

.page-faq .qa-a p {
  margin: 0;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--faq-text);
}

.page-faq .qa-a p + p,
.page-faq .qa-a p + ol,
.page-faq .qa-a ol + p {
  margin-top: 10px;
}

.page-faq .qa-a a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(56, 242, 208, 0.45);
}

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

.page-faq .qa-steps {
  display: grid;
  gap: 8px;
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .qa-steps li {
  display: flex;
  gap: 10px;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--faq-text);
}

.page-faq .qa-steps li span {
  flex: none;
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

.page-faq .contact-lines {
  display: grid;
  gap: 8px;
  margin: 0 0 12px;
  padding: 12px 14px;
  border: 1px dashed var(--line);
  border-radius: var(--r-s);
  background: rgba(11, 15, 14, 0.45);
}

.page-faq .contact-lines p {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: baseline;
  margin: 0;
  font-size: 14px;
  line-height: 1.6;
}

.page-faq .contact-k {
  flex: none;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--faq-dim);
}

.page-faq .contact-v {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--cyan);
  overflow-wrap: anywhere;
}

/* ---------- 下一页索引 ---------- */
.page-faq .faq-next {
  padding: clamp(20px, 3vw, 30px);
  border: 1px solid var(--line);
  border-radius: var(--r-l);
  background: linear-gradient(150deg, var(--forest-lift), var(--forest) 70%);
  scroll-margin-top: 96px;
}

.page-faq .faq-next .block-title {
  margin-bottom: clamp(14px, 2vw, 20px);
}

.page-faq .next-links {
  display: grid;
  gap: 8px;
}

.page-faq .next-link {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: var(--r-s);
  background: rgba(11, 15, 14, 0.4);
  color: var(--mist);
  font-size: 14.5px;
  line-height: 1.6;
  text-decoration: none;
  transition: border-color var(--dur-fast) ease, background var(--dur-fast) ease, transform var(--dur-fast) ease;
}

.page-faq .next-link:hover,
.page-faq .next-link:focus-visible {
  border-color: var(--cyan);
  background: rgba(56, 242, 208, 0.09);
  transform: translateX(2px);
}

.page-faq .next-num {
  flex: none;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.page-faq .next-text {
  min-width: 0;
}

/* ---------- 断点 ---------- */
@media (min-width: 760px) {
  .page-faq .faq-hero-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: end;
    gap: clamp(30px, 4vw, 56px);
  }

  .page-faq .faq-next .next-links {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-faq .next-link {
    align-items: flex-start;
    flex-direction: column;
    gap: 6px;
  }
}

@media (min-width: 920px) {
  .page-faq .faq-body {
    grid-template-columns: var(--faq-rail) minmax(0, 1fr);
    align-items: start;
    gap: clamp(28px, 3.6vw, 56px);
  }

  .page-faq .faq-rail {
    position: sticky;
    top: 92px;
  }

  .page-faq .rail-list {
    grid-auto-flow: row;
    grid-auto-columns: auto;
    gap: 2px;
    padding-bottom: 0;
    overflow: visible;
  }

  .page-faq .rail-list a {
    position: relative;
    width: 100%;
    padding: 10px 12px 10px 16px;
    border: 0;
    border-radius: var(--r-s);
    background: transparent;
    white-space: normal;
  }

  .page-faq .rail-list a::before {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    width: 2px;
    height: 15px;
    border-radius: 2px;
    background: var(--line);
    transform: translateY(-50%);
    transition: height var(--dur-fast) ease, background var(--dur-fast) ease;
  }

  .page-faq .rail-list a:hover::before,
  .page-faq .rail-list a:focus-visible::before {
    height: 22px;
    background: var(--cyan);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa summary::after,
  .page-faq .next-link {
    transition: opacity var(--dur-fast) ease;
  }

  .page-faq .next-link:hover,
  .page-faq .next-link:focus-visible {
    transform: none;
  }
}
<<<END>>>
```