.page-faq {
  --faq-line: rgba(147, 166, 196, 0.22);
  --faq-accent: var(--cyan);
  background: var(--night);
  color: var(--mist);
  font-family: var(--font-body);
  line-height: 1.75;
}
.page-faq * {
  box-sizing: border-box;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: 0 0 clamp(48px, 7vw, 88px);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 36px), 0 100%);
  background: linear-gradient(142deg, var(--abyss) 0%, #071a38 52%, var(--night) 100%);
}
.page-faq .faq-hero__bg {
  position: absolute;
  inset: 0;
  z-index: -2;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.4;
}
.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(115% 85% at 86% 4%, rgba(0, 229, 255, 0.18), transparent 58%),
    linear-gradient(180deg, rgba(6, 18, 41, 0.12), rgba(6, 18, 41, 0.9));
  pointer-events: none;
}
.page-faq .faq-hero__inner {
  position: relative;
  padding-top: clamp(92px, 15vw, 156px);
}
.page-faq .faq-hero .crumbs {
  margin-bottom: 22px;
  font-size: 13px;
}
.page-faq .faq-hero h1 {
  margin: 14px 0 18px;
  max-width: 21ch;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(31px, 6.2vw, 56px);
  line-height: 1.14;
  letter-spacing: -0.01em;
  color: var(--mist);
}
.page-faq .faq-hero .lede {
  max-width: 60ch;
  margin: 0;
  font-size: clamp(15px, 2.4vw, 17px);
  line-height: 1.8;
  color: var(--haze);
}
.page-faq .faq-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
  margin-top: 26px;
  padding-top: 18px;
  border-top: 1px solid var(--faq-line);
  font-size: 13px;
  letter-spacing: 0.03em;
  color: var(--haze);
}
.page-faq .faq-hero__meta b {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--cyan);
  letter-spacing: 0.04em;
}

/* ---------- 分组索引条 ---------- */
.page-faq .faq-index {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(6, 18, 41, 0.94);
  backdrop-filter: blur(10px);
  border-top: 1px solid var(--faq-line);
  border-bottom: 1px solid var(--faq-line);
}
.page-faq .faq-index__scroll {
  display: flex;
  gap: 10px;
  padding-top: 12px;
  padding-bottom: 12px;
  overflow-x: auto;
  overscroll-behavior-x: contain;
  scrollbar-width: none;
}
.page-faq .faq-index__scroll::-webkit-scrollbar {
  display: none;
}
.page-faq .faq-pill {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 15px;
  border: 1px solid var(--faq-line);
  color: var(--haze);
  font-size: 14px;
  line-height: 1.4;
  text-decoration: none;
  white-space: nowrap;
  clip-path: polygon(10px 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%, 0 10px);
  transition: background 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.page-faq .faq-pill__n {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--cyan);
}
.page-faq .faq-pill:hover,
.page-faq .faq-pill:focus-visible {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--night);
  outline: none;
}
.page-faq .faq-pill:hover .faq-pill__n,
.page-faq .faq-pill:focus-visible .faq-pill__n {
  color: var(--night);
}

/* ---------- 分组 ---------- */
.page-faq .faq-group--magenta { --faq-accent: var(--magenta); }
.page-faq .faq-group--teal { --faq-accent: var(--green); }
.page-faq .faq-group--orange { --faq-accent: var(--orange); }

.page-faq .faq-group {
  padding: clamp(46px, 7vw, 82px) 0 clamp(30px, 4.5vw, 52px);
  scroll-margin-top: 76px;
}
.page-faq .faq-group__head {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0 14px;
  align-items: start;
  margin-bottom: clamp(20px, 3vw, 30px);
  padding-left: 15px;
  border-left: 3px solid var(--faq-accent);
}
.page-faq .faq-group__num {
  padding-top: 6px;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(18px, 3.4vw, 26px);
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--faq-accent);
}
.page-faq .faq-group h2 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(23px, 4.2vw, 33px);
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--mist);
}
.page-faq .faq-group__desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--haze);
}

/* ---------- 折叠面板 ---------- */
.page-faq .faq-list {
  display: grid;
  gap: 10px;
}
.page-faq .faq-item {
  position: relative;
  background: var(--card);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, var(--cut) 100%, 0 calc(100% - var(--cut)));
  transition: background 0.2s var(--ease);
}
.page-faq .faq-item::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: var(--cut);
  left: 0;
  width: 3px;
  background: var(--faq-accent);
  opacity: 0;
  transition: opacity 0.24s var(--ease);
}
.page-faq .faq-item[open]::before {
  opacity: 1;
}
.page-faq .faq-item:hover {
  background: #1a3768;
}
.page-faq .faq-q {
  display: flex;
  align-items: flex-start;
  gap: 11px;
  padding: 15px 18px 15px 20px;
  cursor: pointer;
  list-style: none;
  font-size: 15.5px;
  font-weight: 600;
  line-height: 1.6;
  color: var(--mist);
}
.page-faq .faq-q::-webkit-details-marker {
  display: none;
}
.page-faq .faq-q:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -3px;
}
.page-faq .faq-q__mark {
  flex: 0 0 auto;
  margin-top: 3px;
  padding: 0 5px;
  border: 1px solid currentColor;
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.6;
  letter-spacing: 0.06em;
  color: var(--faq-accent);
}
.page-faq .faq-q__icon {
  position: relative;
  flex: 0 0 auto;
  width: 14px;
  height: 14px;
  margin-top: 6px;
  margin-left: auto;
}
.page-faq .faq-q__icon::before,
.page-faq .faq-q__icon::after {
  content: "";
  position: absolute;
  background: var(--haze);
  transition: transform 0.24s var(--ease), background 0.24s var(--ease);
}
.page-faq .faq-q__icon::before {
  top: 6px;
  left: 0;
  right: 0;
  height: 2px;
}
.page-faq .faq-q__icon::after {
  top: 0;
  bottom: 0;
  left: 6px;
  width: 2px;
}
.page-faq .faq-item[open] .faq-q__icon::before {
  background: var(--cyan);
}
.page-faq .faq-item[open] .faq-q__icon::after {
  transform: scaleY(0);
}
.page-faq .faq-a {
  padding: 0 18px 17px 20px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--haze);
  animation: faqSlide 0.24s var(--ease) both;
}
.page-faq .faq-a p {
  margin: 0;
}
@keyframes faqSlide {
  from {
    opacity: 0;
    transform: translateY(-6px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}
.page-faq .faq-num {
  padding: 0 4px;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 0.94em;
  letter-spacing: 0.04em;
  color: var(--cyan);
  background: rgba(0, 229, 255, 0.1);
  border-radius: 2px;
  word-break: break-word;
}
.page-faq .faq-link {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}
.page-faq .faq-link:hover {
  color: var(--mist);
}

/* ---------- 同步示意图 ---------- */
.page-faq .faq-figure {
  margin: clamp(22px, 3.4vw, 34px) 0 0;
  background: var(--abyss);
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 0 100%);
  padding: 10px;
}
.page-faq .faq-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 12px 100%, 0 calc(100% - 12px));
}
.page-faq .faq-figure figcaption {
  padding: 12px 6px 4px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--haze);
  letter-spacing: 0.02em;
}

/* ---------- 呼吸色带 ---------- */
.page-faq .faq-divider {
  height: 2px;
  margin: 0;
  border: 0;
  opacity: 0.62;
}
.page-faq .faq-divider--a {
  background: linear-gradient(90deg, transparent, var(--teal), var(--cyan), transparent);
}
.page-faq .faq-divider--b {
  background: linear-gradient(90deg, transparent, var(--indigo), var(--magenta), transparent);
}
.page-faq .faq-divider--c {
  background: linear-gradient(90deg, transparent, var(--teal), var(--green), transparent);
}
.page-faq .faq-divider--d {
  background: linear-gradient(90deg, transparent, var(--wine), var(--orange), transparent);
}

/* ---------- 下一步 ---------- */
.page-faq .faq-next {
  padding: clamp(48px, 7vw, 88px) 0 clamp(56px, 8vw, 96px);
  background: linear-gradient(158deg, var(--abyss) 0%, var(--night) 72%);
  scroll-margin-top: 76px;
}
.page-faq .faq-next__panel {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
  padding: clamp(24px, 4.4vw, 44px);
  background: var(--card);
  clip-path: polygon(0 0, calc(100% - 30px) 0, 100% 30px, 100% 100%, 0 100%);
}
.page-faq .faq-next h2 {
  margin: 12px 0 14px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(23px, 4.2vw, 32px);
  line-height: 1.24;
  letter-spacing: -0.01em;
  color: var(--mist);
}
.page-faq .faq-next__lede {
  margin: 0 0 20px;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--haze);
}
.page-faq .faq-next__list {
  display: grid;
  gap: 10px;
  margin: 0 0 24px;
  padding: 0;
  list-style: none;
}
.page-faq .faq-next__list li {
  position: relative;
  padding-left: 20px;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--mist);
}
.page-faq .faq-next__list li::before {
  content: "";
  position: absolute;
  top: 11px;
  left: 0;
  width: 9px;
  height: 2px;
  background: var(--orange);
}
.page-faq .faq-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.page-faq .faq-next__mail {
  margin: 20px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--haze);
}
.page-faq .faq-next__mail span {
  font-family: var(--font-mono);
  color: var(--cyan);
  word-break: break-all;
}
.page-faq .faq-next__aside {
  padding-top: 22px;
  border-top: 1px solid var(--faq-line);
}
.page-faq .faq-next__aside-title {
  margin: 0 0 6px;
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--haze);
}
.page-faq .faq-quick {
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-faq .faq-quick a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 11px 0;
  border-bottom: 1px dashed var(--faq-line);
  font-size: 14.5px;
  color: var(--mist);
  text-decoration: none;
  transition: color 0.2s var(--ease);
}
.page-faq .faq-quick a::after {
  content: "→";
  flex: 0 0 auto;
  font-family: var(--font-mono);
  color: var(--haze);
}
.page-faq .faq-quick a:hover,
.page-faq .faq-quick a:focus-visible {
  color: var(--cyan);
  outline: none;
}
.page-faq .faq-quick a:hover::after {
  color: var(--cyan);
}

/* ---------- 响应式 ---------- */
@media (min-width: 768px) {
  .page-faq .faq-index__scroll {
    padding-top: 14px;
    padding-bottom: 14px;
    gap: 12px;
  }
  .page-faq .faq-q {
    padding: 18px 24px 18px 26px;
    font-size: 17px;
  }
  .page-faq .faq-a {
    padding: 0 24px 22px 26px;
    font-size: 16px;
  }
  .page-faq .faq-list {
    gap: 12px;
  }
  .page-faq .faq-group__head {
    padding-left: 20px;
  }
  .page-faq .faq-figure {
    padding: 14px;
  }
  .page-faq .faq-figure figcaption {
    font-size: 13.5px;
  }
}

@media (min-width: 960px) {
  .page-faq .faq-hero h1 {
    max-width: 24ch;
  }
  .page-faq .faq-group__head {
    grid-template-columns: 64px 1fr;
    gap: 0 20px;
  }
  .page-faq .faq-group__num {
    padding-top: 8px;
    font-size: 30px;
  }
  .page-faq .faq-list {
    margin-left: 84px;
  }
  .page-faq .faq-figure {
    margin-left: 84px;
  }
  .page-faq .faq-next__panel {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 0.85fr);
    align-items: start;
  }
  .page-faq .faq-next__aside {
    padding-top: 0;
    padding-left: 28px;
    border-top: 0;
    border-left: 1px solid var(--faq-line);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-a {
    animation: none;
  }
  .page-faq .faq-item::before,
  .page-faq .faq-q__icon::before,
  .page-faq .faq-q__icon::after,
  .page-faq .faq-item {
    transition: none;
  }
}
<<<END>>>