.page-faq {
  --faq-rail: 300px;
  display: block;
}

/* ---------- 顶部 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: 64px 0 36px;
  background:
    radial-gradient(720px 320px at 84% -8%, rgba(0, 229, 208, 0.16), transparent 68%),
    radial-gradient(560px 280px at 4% 8%, rgba(30, 53, 102, 0.6), transparent 72%),
    linear-gradient(180deg, var(--ink-1) 0%, var(--ink-0) 100%);
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--line-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-soft) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.7), transparent 84%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.7), transparent 84%);
  pointer-events: none;
}

.page-faq .faq-hero > .shell {
  position: relative;
  z-index: 1;
}

.page-faq .breadcrumb ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0 0 26px;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--slate);
}

.page-faq .breadcrumb li + li::before {
  content: "/";
  margin-right: 10px;
  color: var(--ink-3);
}

.page-faq .breadcrumb a {
  color: var(--slate);
  text-decoration: none;
  transition: color 0.2s var(--ease);
}

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

.page-faq .faq-h1 {
  margin: 14px 0 0;
  max-width: 24ch;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2rem, 6.6vw, 4rem);
  line-height: 1.04;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-faq .faq-lede {
  margin: 18px 0 0;
  max-width: 62ch;
  color: var(--slate);
  font-size: 1.02rem;
  line-height: 1.78;
}

.page-faq .faq-stats {
  list-style: none;
  margin: 36px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 6px;
  overflow: hidden;
}

.page-faq .faq-stats > li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 16px 18px;
  background: var(--ink-1);
}

.page-faq .faq-stats .num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
}

.page-faq .faq-stats > li > span:last-child {
  font-size: 0.8rem;
  line-height: 1.4;
  color: var(--slate);
}

@media (min-width: 720px) {
  .page-faq .faq-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 横幅 ---------- */
.page-faq .faq-banner {
  margin: 0;
  border-radius: 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-banner img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 380px;
  object-fit: cover;
}

/* ---------- 双区主体 ---------- */
.page-faq .faq-desk {
  position: relative;
  padding: 52px 0 76px;
  background: var(--ink-0);
}

.page-faq .faq-desk__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
}

.page-faq .faq-index__caption {
  margin: 0 0 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--slate);
}

.page-faq .faq-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-faq .faq-index__list > li:nth-child(1) { --cat: var(--red); }
.page-faq .faq-index__list > li:nth-child(2) { --cat: var(--cyan); }
.page-faq .faq-index__list > li:nth-child(3) { --cat: var(--cyan-soft); }
.page-faq .faq-index__list > li:nth-child(4) { --cat: var(--orange); }
.page-faq .faq-index__list > li:nth-child(5) { --cat: var(--cyan); }
.page-faq .faq-index__list > li:nth-child(6) { --cat: var(--orange); }

.page-faq .faq-index__item {
  position: relative;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 3px 12px;
  padding: 12px 12px 12px 16px;
  border-radius: 4px;
  text-decoration: none;
  color: var(--slate);
  transition: background-color 0.2s var(--ease), color 0.2s var(--ease);
}

.page-faq .faq-index__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  bottom: 8px;
  width: 3px;
  border-radius: 2px;
  background: var(--cat, var(--cyan));
  opacity: 0.6;
  transition: opacity 0.2s var(--ease), width 0.2s var(--ease);
}

.page-faq .faq-index__item:hover,
.page-faq .faq-index__item:focus-visible {
  background: rgba(0, 229, 208, 0.07);
  color: var(--paper);
}

.page-faq .faq-index__item:hover::before,
.page-faq .faq-index__item:focus-visible::before {
  opacity: 1;
  width: 4px;
}

.page-faq .faq-index__no {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--cyan);
}

.page-faq .faq-index__label {
  font-size: 0.92rem;
  line-height: 1.45;
}

.page-faq .faq-index__count {
  grid-column: 2;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  color: rgba(140, 154, 181, 0.72);
}

/* ---------- 答案区 ---------- */
.page-faq .faq-answers {
  display: grid;
  gap: 46px;
  min-width: 0;
}

.page-faq .faq-group {
  min-width: 0;
  scroll-margin-top: 96px;
}

.page-faq .faq-group__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-group__no {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 1.85rem;
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
}

.page-faq .faq-group__title {
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(1.15rem, 2.6vw, 1.5rem);
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-faq .faq-group__note {
  margin: 14px 0 0;
  max-width: 56ch;
  font-size: 0.94rem;
  line-height: 1.7;
  color: var(--slate);
}

.page-faq .faq-list {
  display: grid;
  gap: 10px;
  margin-top: 20px;
}

.page-faq .faq-item {
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--ink-1);
  transition: border-color 0.24s var(--ease), background-color 0.24s var(--ease);
}

.page-faq .faq-item[open] {
  border-color: rgba(0, 229, 208, 0.34);
  background: linear-gradient(180deg, rgba(18, 34, 74, 0.82) 0%, rgba(11, 22, 48, 0.94) 100%);
  -webkit-backdrop-filter: blur(9px);
  backdrop-filter: blur(9px);
}

.page-faq .faq-item > summary {
  position: relative;
  display: block;
  cursor: pointer;
  list-style: none;
  padding: 15px 52px 15px 18px;
  font-size: 0.98rem;
  font-weight: 600;
  line-height: 1.55;
  color: var(--paper);
  transition: color 0.2s var(--ease);
}

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

.page-faq .faq-item > summary::after {
  content: "+";
  position: absolute;
  right: 18px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 1.15rem;
  line-height: 1;
  color: var(--cyan);
  transition: color 0.2s var(--ease);
}

.page-faq .faq-item[open] > summary::after {
  content: "−";
}

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

.page-faq .faq-item__a {
  margin-top: 2px;
  padding: 14px 18px 18px;
  border-top: 1px solid var(--line-soft);
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--slate);
}

.page-faq .faq-item__a p {
  margin: 0;
}

.page-faq .faq-item__a p + p {
  margin-top: 10px;
}

.page-faq .faq-steps {
  list-style: none;
  counter-reset: faqstep;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 11px;
}

.page-faq .faq-steps > li {
  position: relative;
  padding-left: 38px;
  line-height: 1.75;
}

.page-faq .faq-steps > li::before {
  counter-increment: faqstep;
  content: counter(faqstep, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 3px;
  display: inline-block;
  min-width: 24px;
  padding: 1px 4px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.66rem;
  font-weight: 700;
  line-height: 1.35;
  text-align: center;
  color: var(--cyan);
  background: rgba(0, 229, 208, 0.1);
  border: 1px solid var(--line-cyan);
  border-radius: 3px;
}

.page-faq .faq-plain {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 9px;
}

.page-faq .faq-plain > li {
  position: relative;
  padding-left: 18px;
  line-height: 1.75;
}

.page-faq .faq-plain > li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 7px;
  height: 7px;
  border-radius: 2px;
  background: var(--cyan);
  opacity: 0.85;
}

.page-faq .faq-inline-media {
  margin: 24px 0 0;
  max-width: 440px;
  border: 1px solid var(--line);
  border-radius: 6px;
}

.page-faq .faq-inline-media img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 252px;
  object-fit: cover;
}

/* ---------- 底部行动 ---------- */
.page-faq .faq-cta {
  padding: 60px 0 76px;
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, var(--ink-0) 0%, var(--ink-1) 100%);
}

.page-faq .faq-cta__inner {
  display: grid;
  gap: 26px;
}

.page-faq .faq-cta__title {
  margin: 10px 0 12px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.6rem, 4.6vw, 2.5rem);
  line-height: 1.06;
  color: var(--paper);
}

.page-faq .faq-cta__text {
  margin: 0;
  max-width: 56ch;
  font-size: 0.96rem;
  line-height: 1.78;
  color: var(--slate);
}

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

/* ---------- 桌面布局 ---------- */
@media (min-width: 940px) {
  .page-faq .faq-hero {
    padding: 88px 0 44px;
  }

  .page-faq .faq-desk {
    padding: 64px 0 88px;
  }

  .page-faq .faq-desk__inner {
    grid-template-columns: var(--faq-rail) minmax(0, 1fr);
    gap: 48px;
    align-items: start;
  }

  .page-faq .faq-index {
    position: sticky;
    top: 84px;
    max-height: calc(100vh - 120px);
    overflow-y: auto;
    padding-right: 4px;
  }

  .page-faq .faq-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 40px;
  }
}

/* ---------- 窄屏兜底 ---------- */
@media (max-width: 480px) {
  .page-faq .faq-hero {
    padding: 48px 0 28px;
  }

  .page-faq .faq-item > summary {
    padding: 14px 44px 14px 16px;
    font-size: 0.94rem;
  }

  .page-faq .faq-item__a {
    padding: 13px 16px 16px;
  }

  .page-faq .faq-cta__actions .btn {
    width: 100%;
  }
}

/* ---------- 无障碍 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-index__item,
  .page-faq .faq-index__item::before,
  .page-faq .faq-item,
  .page-faq .faq-item > summary,
  .page-faq .faq-item > summary::after {
    transition: none;
  }
}
<<<END>>>