.page-faq {
  --faq-gap: clamp(20px, 3vw, 40px);
  --faq-pad: clamp(44px, 7vw, 92px);
  --faq-hair: rgba(38, 48, 107, 0.85);
  background: var(--ink);
  color: var(--ivory);
  overflow-x: clip;
}

.page-faq .faq-group,
.page-faq .faq-letter,
.page-faq .faq-index {
  scroll-margin-top: 28px;
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  position: relative;
  padding: clamp(28px, 4.5vw, 56px) 0 clamp(44px, 7vw, 88px);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
  background:
    radial-gradient(110% 85% at 86% 0%, rgba(167, 139, 218, 0.24), transparent 62%),
    radial-gradient(80% 70% at 4% 100%, rgba(240, 114, 78, 0.10), transparent 66%),
    linear-gradient(180deg, #0D1338 0%, #0A0F2C 72%);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.55;
  background-image:
    repeating-linear-gradient(90deg, rgba(38, 48, 107, 0.55) 0 1px, transparent 1px 92px),
    repeating-linear-gradient(0deg, rgba(38, 48, 107, 0.38) 0 1px, transparent 1px 92px);
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9), transparent 78%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9), transparent 78%);
}

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

.page-faq .faq-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 52px);
  align-items: end;
  margin-top: clamp(26px, 4vw, 44px);
}

@media (min-width: 900px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: clamp(32px, 4.5vw, 64px);
  }
}

.page-faq .faq-hero__copy h1 {
  margin: 16px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(40px, 7.4vw, 88px);
  line-height: 0.98;
  letter-spacing: -0.02em;
  color: var(--ivory);
}

.page-faq .faq-hero__lead {
  margin: 22px 0 0;
  max-width: 620px;
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.9;
  color: var(--star);
}

.page-faq .faq-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 16px clamp(24px, 4vw, 44px);
  margin: 28px 0 0;
  padding: 22px 0 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-faq .faq-hero__fact {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.page-faq .faq-hero__fact strong {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: clamp(19px, 2.4vw, 24px);
  color: var(--gold);
  letter-spacing: -0.01em;
}

.page-faq .faq-hero__fact span {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--star);
}

.page-faq .faq-hero__media {
  margin: 0;
}

.page-faq .faq-hero__media .media__frame {
  border: 1px solid var(--line);
  background: linear-gradient(150deg, rgba(167, 139, 218, 0.30), rgba(18, 26, 69, 0.85) 55%, rgba(10, 15, 44, 0.95));
}

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

/* ---------- 主题索引 ---------- */

.page-faq .faq-index {
  padding: var(--faq-pad) 0;
  background: var(--ink);
}

.page-faq .faq-index__head {
  max-width: 760px;
}

.page-faq .faq-index__head h2 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(26px, 3.6vw, 42px);
  line-height: 1.16;
  letter-spacing: -0.01em;
}

.page-faq .faq-index__sub {
  margin: 14px 0 0;
  max-width: 560px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--star);
}

.page-faq .faq-index__grid {
  list-style: none;
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

@media (min-width: 640px) {
  .page-faq .faq-index__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1024px) {
  .page-faq .faq-index__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-faq .faq-index__cell {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  grid-template-areas:
    "num go"
    "name name"
    "desc desc";
  gap: 10px 14px;
  height: 100%;
  padding: clamp(20px, 2.6vw, 30px);
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  text-decoration: none;
  color: var(--ivory);
  background: linear-gradient(180deg, rgba(18, 26, 69, 0.52), rgba(10, 15, 44, 0.12));
  transition: background var(--dur) var(--ease);
}

.page-faq .faq-index__cell::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--gold), var(--coral));
  transform: scaleY(0);
  transform-origin: top center;
  transition: transform 320ms var(--ease);
}

.page-faq .faq-index__cell:hover,
.page-faq .faq-index__cell:focus-visible {
  background: linear-gradient(180deg, rgba(32, 44, 104, 0.78), rgba(18, 26, 69, 0.38));
}

.page-faq .faq-index__cell:hover::before,
.page-faq .faq-index__cell:focus-visible::before {
  transform: scaleY(1);
}

.page-faq .faq-index__num {
  grid-area: num;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--gold);
}

.page-faq .faq-index__go {
  grid-area: go;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--star);
  transition: transform 240ms var(--ease), color 240ms var(--ease);
}

.page-faq .faq-index__cell:hover .faq-index__go {
  color: var(--coral);
  transform: translateX(4px);
}

.page-faq .faq-index__name {
  grid-area: name;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(19px, 2.2vw, 23px);
  line-height: 1.3;
}

.page-faq .faq-index__desc {
  grid-area: desc;
  font-size: 13px;
  line-height: 1.75;
  color: var(--star);
}

.page-faq .faq-index__figure {
  margin: clamp(28px, 4vw, 44px) 0 0;
}

.page-faq .faq-index__figure .media__frame {
  border: 1px solid var(--line);
  background: linear-gradient(140deg, rgba(167, 139, 218, 0.26), rgba(18, 26, 69, 0.8));
}

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

/* ---------- 问答分组 ---------- */

.page-faq .faq-group {
  padding: clamp(38px, 6vw, 76px) 0;
  border-top: 1px solid var(--hair);
  background: var(--ink);
}

.page-faq .faq-group--alt {
  background: linear-gradient(180deg, #0B1134 0%, #090E28 100%);
}

.page-faq .faq-group__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 6px 16px;
  align-items: start;
  margin-bottom: clamp(18px, 3vw, 30px);
}

.page-faq .faq-group__num {
  margin: 0;
  padding-top: 8px;
  border-top: 2px solid var(--coral);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--coral);
}

.page-faq .faq-group__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(24px, 3.4vw, 38px);
  line-height: 1.15;
  letter-spacing: -0.01em;
}

.page-faq .faq-group__intro {
  grid-column: 2;
  margin: 0;
  max-width: 640px;
  font-size: 14px;
  line-height: 1.85;
  color: var(--star);
}

.page-faq .faq-group__list {
  padding-left: 16px;
  border-top: 1px solid var(--hair);
}

/* ---------- 折叠问答 ---------- */

.page-faq .faq-item {
  border-bottom: 1px solid var(--hair);
}

.page-faq .faq-item > summary {
  list-style: none;
}

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

.page-faq .faq-item__q {
  position: relative;
  display: block;
  padding: 20px 40px 20px 0;
  cursor: pointer;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(16px, 1.9vw, 19px);
  line-height: 1.55;
  color: var(--ivory);
  transition: color 220ms var(--ease);
}

.page-faq .faq-item__q::before {
  content: "";
  position: absolute;
  left: -16px;
  top: 21px;
  bottom: 21px;
  width: 2px;
  background: var(--gold);
  opacity: 0;
  transition: opacity 220ms var(--ease);
}

.page-faq .faq-item__q::after {
  content: "+";
  position: absolute;
  right: 4px;
  top: 17px;
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1.2;
  color: var(--gold);
  transition: color 220ms var(--ease);
}

.page-faq .faq-item__q:hover,
.page-faq .faq-item__q:focus-visible {
  color: var(--gold);
}

.page-faq .faq-item[open] > .faq-item__q {
  color: var(--gold);
}

.page-faq .faq-item[open] > .faq-item__q::before {
  opacity: 1;
}

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

.page-faq .faq-item__a {
  padding: 0 40px 24px 0;
  color: var(--star);
  font-size: 15px;
  line-height: 1.9;
  animation: faq-open 320ms var(--ease) both;
}

.page-faq .faq-item__a p {
  margin: 0;
  max-width: 40em;
}

@keyframes faq-open {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* ---------- 来信 ---------- */

.page-faq .faq-letter {
  padding: var(--faq-pad) 0;
  border-top: 1px solid var(--line);
  background:
    radial-gradient(85% 120% at 8% 0%, rgba(167, 139, 218, 0.22), transparent 62%),
    radial-gradient(70% 100% at 100% 100%, rgba(232, 197, 106, 0.12), transparent 64%),
    linear-gradient(160deg, #131B4A 0%, #0A0F2C 72%);
}

.page-faq .faq-letter__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 52px);
}

@media (min-width: 900px) {
  .page-faq .faq-letter__grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 0.6fr);
    align-items: start;
  }
}

.page-faq .faq-letter__main h2 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(26px, 3.6vw, 40px);
  line-height: 1.18;
  letter-spacing: -0.01em;
}

.page-faq .faq-letter__lead {
  margin: 20px 0 0;
  max-width: 620px;
  font-size: 15px;
  line-height: 1.95;
  color: var(--star);
}

.page-faq .faq-letter__mail {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--gold);
  word-break: break-all;
}

.page-faq .faq-letter__sub {
  margin: 24px 0 0;
  font-size: 14px;
  letter-spacing: 0.02em;
  color: var(--ivory);
}

.page-faq .faq-letter__list {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
  max-width: 560px;
}

.page-faq .faq-letter__list li {
  position: relative;
  padding-left: 20px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--star);
}

.page-faq .faq-letter__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.78em;
  width: 10px;
  height: 1px;
  background: var(--gold);
}

.page-faq .faq-letter__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.page-faq .faq-letter__aside {
  padding: clamp(20px, 2.6vw, 30px);
  border: 1px solid var(--line);
  background: rgba(10, 15, 44, 0.6);
}

.page-faq .faq-letter__aside-title {
  margin: 0 0 18px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--hair);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--gold);
}

.page-faq .faq-letter__aside ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-faq .faq-letter__aside a {
  display: block;
  padding-bottom: 6px;
  border-bottom: 1px solid rgba(232, 197, 106, 0.24);
  color: var(--ivory);
  text-decoration: none;
  font-size: 14px;
  line-height: 1.6;
  transition: color 220ms var(--ease), border-color 220ms var(--ease);
}

.page-faq .faq-letter__aside a:hover,
.page-faq .faq-letter__aside a:focus-visible {
  color: var(--gold);
  border-color: var(--gold);
}

/* ---------- 窄屏与降级 ---------- */

@media (max-width: 480px) {
  .page-faq .faq-index__cell {
    padding: 18px;
  }

  .page-faq .faq-group__list {
    padding-left: 12px;
  }

  .page-faq .faq-item__q {
    padding-right: 32px;
  }

  .page-faq .faq-item__q::before {
    left: -12px;
  }

  .page-faq .faq-item__a {
    padding-right: 12px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq *,
  .page-faq *::before,
  .page-faq *::after {
    animation-duration: 1ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 1ms !important;
  }

  .page-faq .faq-item__a {
    animation: none;
  }
}
<<<END>>>

.page-faq {
  --hair: currentColor;
}