.page-faq {
  --faq-gap: clamp(20px, 3vw, 40px);
  --faq-pad: clamp(18px, 4vw, 34px);
  --faq-indent: clamp(38px, 6vw, 54px);
  background: var(--bm-cockpit);
  color: var(--bm-cream);
  font-family: var(--bm-font-body);
  font-size: clamp(15px, 1.2vw, 17px);
  line-height: 1.75;
  overflow-x: hidden;
}

.page-faq h1,
.page-faq h2 {
  font-family: var(--bm-font-head);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.05;
  margin: 0;
}

.page-faq a {
  color: var(--bm-blue);
  text-decoration: none;
  border-bottom: 1px solid rgba(45, 156, 255, 0.35);
}

.page-faq a:hover {
  color: var(--bm-orange);
  border-bottom-color: var(--bm-orange);
}

.page-faq .bm-crumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  font-family: var(--bm-font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--bm-faint);
  padding-top: clamp(16px, 3vw, 28px);
}

.page-faq .bm-crumbs__item {
  border: 0;
  color: var(--bm-dim);
}

.page-faq .bm-crumbs__item + .bm-crumbs__item::before {
  content: "/";
  margin-right: 8px;
  color: var(--bm-faint);
}

.page-faq .bm-eyebrow {
  font-family: var(--bm-font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--bm-cyan);
  margin: 0 0 14px;
}

/* ---------- 首屏 ---------- */
.faq-hero {
  position: relative;
  padding-bottom: clamp(36px, 6vw, 72px);
  border-bottom: 1px solid var(--bm-line);
  background:
    radial-gradient(120% 80% at 82% 0%, rgba(45, 156, 255, 0.18) 0%, transparent 58%),
    radial-gradient(90% 70% at 0% 100%, rgba(255, 138, 61, 0.12) 0%, transparent 60%);
}

.faq-hero__grid {
  display: grid;
  gap: var(--faq-gap);
  margin-top: clamp(24px, 4vw, 44px);
}

.faq-hero__main h1 {
  font-size: clamp(32px, 6.4vw, 64px);
  max-width: 15em;
}

.faq-hero .bm-lead {
  margin: clamp(16px, 2.6vw, 24px) 0 0;
  max-width: 46ch;
  color: var(--bm-dim);
  font-size: clamp(15px, 1.3vw, 18px);
  line-height: 1.8;
}

.faq-hot {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  margin-top: clamp(20px, 3vw, 30px);
}

.faq-hot__label {
  font-family: var(--bm-font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--bm-faint);
  margin-right: 4px;
}

.page-faq .faq-hot__link {
  display: inline-block;
  padding: 6px 12px;
  border: 1px solid var(--bm-line-2);
  color: var(--bm-silver);
  font-size: 13px;
  line-height: 1.4;
  background: rgba(16, 42, 67, 0.6);
  transition: border-color 0.2s var(--bm-ease), color 0.2s var(--bm-ease), background 0.2s var(--bm-ease);
}

.page-faq .faq-hot__link:hover,
.page-faq .faq-hot__link:focus-visible {
  border-color: var(--bm-orange);
  color: var(--bm-cream);
  background: rgba(255, 138, 61, 0.12);
}

.faq-hero__stats {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  margin: clamp(26px, 4vw, 40px) 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--bm-line);
}

.faq-stat {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 14px;
  padding: 14px 0;
  border-bottom: 1px solid var(--bm-line);
}

.faq-stat__num {
  font-family: var(--bm-font-mono);
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 600;
  color: var(--bm-cream);
  letter-spacing: -0.01em;
}

.faq-stat__label {
  font-size: 13px;
  color: var(--bm-faint);
  letter-spacing: 0.02em;
}

.faq-hero__media {
  border: 1px solid var(--bm-line-2);
}

.faq-hero__media img,
.faq-support__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 知识地图 ---------- */
.faq-map {
  background: var(--bm-deep);
  border-bottom: 1px solid var(--bm-line);
  padding: clamp(32px, 5vw, 60px) 0;
  background-image:
    linear-gradient(to right, rgba(201, 210, 220, 0.05) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(201, 210, 220, 0.05) 1px, transparent 1px);
  background-size: 48px 48px;
}

.faq-map__head {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: clamp(20px, 3vw, 32px);
}

.faq-map__head .bm-mono {
  font-family: var(--bm-font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--bm-cyan);
}

.faq-map__head h2 {
  font-size: clamp(22px, 3vw, 34px);
  max-width: 24em;
  color: var(--bm-cream);
}

.faq-map__svg {
  display: block;
  width: 100%;
  height: auto;
  overflow: visible;
}

.faq-map__rail {
  fill: none;
  stroke: var(--bm-line-2);
  stroke-width: 1;
}

.faq-map__link {
  fill: none;
  stroke: var(--bm-orange);
  stroke-width: 1.5;
  stroke-dasharray: 5 5;
  opacity: 0.75;
}

.faq-map__node circle {
  fill: var(--bm-cockpit);
  stroke: var(--bm-cyan);
  stroke-width: 2;
}

.faq-map__node:nth-child(even) circle {
  stroke: var(--bm-blue);
}

.faq-map__label {
  fill: var(--bm-silver);
  font-family: var(--bm-font-mono);
  font-size: 15px;
  letter-spacing: 0.04em;
}

/* ---------- 主体布局 ---------- */
.faq-layout {
  display: grid;
  gap: var(--faq-gap);
  padding: clamp(32px, 5vw, 64px) 0 clamp(40px, 6vw, 80px);
}

.faq-rail {
  display: none;
}

.faq-rail__title {
  font-family: var(--bm-font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--bm-faint);
  margin: 0 0 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--bm-line);
}

.page-faq .bm-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.page-faq .bm-rail__link {
  display: flex;
  gap: 10px;
  align-items: baseline;
  padding: 9px 10px 9px 0;
  border: 0;
  border-left: 2px solid transparent;
  color: var(--bm-dim);
  font-size: 14px;
  line-height: 1.4;
  transition: color 0.2s var(--bm-ease), border-color 0.2s var(--bm-ease), background 0.2s var(--bm-ease);
}

.page-faq .bm-rail__link:hover,
.page-faq .bm-rail__link:focus-visible {
  color: var(--bm-cream);
  border-left-color: var(--bm-line-2);
}

.page-faq .bm-rail__link.is-active {
  color: var(--bm-cream);
  border-left-color: var(--bm-orange);
  background: rgba(255, 138, 61, 0.08);
  padding-left: 10px;
}

.page-faq .bm-rail__num {
  font-family: var(--bm-font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--bm-cyan);
}

.faq-rail__note {
  margin: 18px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--bm-line);
  font-size: 12px;
  line-height: 1.7;
  color: var(--bm-faint);
}

/* ---------- 章节与问答 ---------- */
.faq-flow {
  display: flex;
  flex-direction: column;
  gap: clamp(28px, 4vw, 48px);
  min-width: 0;
}

.faq-block {
  border-top: 1px solid var(--bm-line-2);
  padding-top: clamp(18px, 3vw, 26px);
  min-width: 0;
}

.faq-block__head {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 14px;
  align-items: start;
  margin-bottom: 10px;
}

.faq-block__num {
  font-family: var(--bm-font-mono);
  font-size: clamp(20px, 2.4vw, 28px);
  font-weight: 600;
  color: var(--bm-gauge);
  -webkit-text-stroke: 1px var(--bm-line-2);
  line-height: 1;
}

.faq-block__head h2 {
  font-size: clamp(22px, 3.2vw, 36px);
  color: var(--bm-cream);
}

.faq-block__intro {
  margin: 8px 0 0;
  color: var(--bm-faint);
  font-size: 14px;
  line-height: 1.7;
}

.faq-list {
  border-bottom: 1px solid var(--bm-line);
}

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

.page-faq .faq-item:first-child {
  border-top: 0;
}

.page-faq .faq-item > summary {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 12px;
  align-items: start;
  padding: 16px 0;
  cursor: pointer;
  list-style: none;
  transition: color 0.2s var(--bm-ease);
}

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

.page-faq .faq-item > summary:hover .faq-item__q,
.page-faq .faq-item > summary:focus-visible .faq-item__q {
  color: var(--bm-orange);
}

.page-faq .faq-item > summary::after {
  content: "+";
  font-family: var(--bm-font-mono);
  font-size: 20px;
  line-height: 1.2;
  color: var(--bm-orange);
  transition: transform 0.2s var(--bm-ease);
}

.page-faq .faq-item[open] > summary::after {
  content: "−";
  transform: rotate(180deg);
}

.faq-item__no {
  font-family: var(--bm-font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--bm-cyan);
  padding-top: 4px;
  white-space: nowrap;
}

.faq-item__q {
  font-family: var(--bm-font-head);
  font-weight: 700;
  font-size: clamp(15px, 1.5vw, 18px);
  line-height: 1.55;
  color: var(--bm-cream);
  transition: color 0.2s var(--bm-ease);
}

.faq-item__a {
  margin: 0 0 20px var(--faq-indent);
  padding-left: 14px;
  border-left: 1px solid var(--bm-line-2);
  color: var(--bm-dim);
  font-size: 14.5px;
  line-height: 1.85;
  max-width: 62ch;
}

.faq-item__a p {
  margin: 0 0 10px;
}

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

.faq-steps {
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
  counter-reset: faq-step;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.faq-steps li {
  counter-increment: faq-step;
  position: relative;
  padding-left: 28px;
  font-size: 14px;
  color: var(--bm-silver);
}

.faq-steps li::before {
  content: counter(faq-step, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 2px;
  font-family: var(--bm-font-mono);
  font-size: 11px;
  color: var(--bm-orange);
  letter-spacing: 0.06em;
}

/* ---------- 客服章节 ---------- */
.faq-block--support {
  background: linear-gradient(180deg, rgba(16, 42, 67, 0.9) 0%, rgba(8, 24, 38, 0) 100%);
  border-top-color: var(--bm-orange);
  padding: clamp(18px, 3vw, 30px) clamp(14px, 3vw, 26px) clamp(10px, 2vw, 16px);
}

.faq-support {
  display: grid;
  gap: clamp(18px, 3vw, 28px);
  margin-top: 6px;
}

.faq-support__media {
  border: 1px solid var(--bm-line-2);
  align-self: start;
}

.faq-copy {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-top: 12px;
}

.page-faq .bm-copy__value {
  font-family: var(--bm-font-mono);
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--bm-cyan);
  word-break: break-all;
}

.page-faq .bm-copy__status {
  font-family: var(--bm-font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--bm-moss);
}

/* ---------- 收尾 ---------- */
.faq-cta {
  background: var(--bm-deep);
  border-top: 1px solid var(--bm-line-2);
  padding: clamp(32px, 5vw, 60px) 0;
}

.faq-cta__grid {
  display: grid;
  gap: var(--faq-gap);
  align-items: start;
}

.faq-cta__title {
  font-size: clamp(24px, 3.6vw, 40px);
  color: var(--bm-cream);
  max-width: 18em;
}

.faq-cta__lead {
  margin: 14px 0 0;
  color: var(--bm-dim);
  font-size: 15px;
  line-height: 1.8;
  max-width: 46ch;
}

.faq-cta__links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}

.page-faq .bm-btn {
  font-family: var(--bm-font-mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border-bottom: 0;
}

.page-faq .bm-btn--ghost {
  color: var(--bm-silver);
}

.page-faq .faq-cta__textlink {
  font-size: 13px;
  color: var(--bm-dim);
  border-bottom: 1px solid var(--bm-line-2);
  padding-bottom: 2px;
}

.page-faq .faq-cta__textlink:hover {
  color: var(--bm-orange);
  border-bottom-color: var(--bm-orange);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .faq-hero__stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .faq-stat {
    flex-direction: column;
    align-items: flex-start;
    gap: 2px;
    padding: 16px 16px 16px 0;
    border-bottom: 0;
    border-right: 1px solid var(--bm-line);
  }

  .faq-stat:last-child {
    border-right: 0;
  }

  .faq-cta__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.85fr);
    align-items: center;
  }

  .faq-cta__links {
    justify-content: flex-start;
  }

  .faq-support {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: start;
  }
}

@media (min-width: 900px) {
  .faq-hero__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    align-items: end;
  }

  .faq-hero__media img {
    aspect-ratio: 3 / 2;
  }
}

@media (min-width: 1024px) {
  .faq-layout {
    grid-template-columns: 250px minmax(0, 1fr);
    gap: clamp(32px, 4vw, 60px);
    align-items: start;
  }

  .faq-rail {
    display: block;
    position: sticky;
    top: calc(var(--bm-header-h) + 20px);
    align-self: start;
    max-height: calc(100vh - var(--bm-header-h) - 40px);
    overflow-y: auto;
  }

  .faq-map__head {
    flex-direction: row;
    align-items: baseline;
    justify-content: space-between;
    gap: 24px;
  }

  .faq-item__a {
    margin-left: calc(var(--faq-indent) + 14px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-hot__link,
  .page-faq .bm-rail__link,
  .page-faq .faq-item > summary::after,
  .faq-item__q {
    transition: none;
  }
}
<<<PAGE_CSS-BOUNDARY>>>
</main>