.page-faq {
  --faq-gap: clamp(22px, 3vw, 40px);
  --faq-cut: 16px;
  color: var(--white);
}

.page-faq img {
  max-width: 100%;
  height: auto;
}

.page-faq [id] {
  scroll-margin-top: calc(var(--bar-h) + 24px);
}

.page-faq__crumb {
  padding-top: clamp(14px, 2vw, 22px);
}

/* ---------- 首屏框景 ---------- */
.faq-hero {
  padding-block: clamp(20px, 3.4vw, 44px) clamp(26px, 4.5vw, 56px);
}

.faq-hero__frame {
  position: relative;
  padding: clamp(26px, 4vw, 54px) clamp(18px, 3vw, 46px) clamp(28px, 4vw, 50px);
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(28, 51, 80, 0.5) 0%, rgba(8, 15, 30, 0) 72%);
}

.faq-hero__frame::before,
.faq-hero__frame::after {
  content: "";
  position: absolute;
  width: 68px;
  height: 68px;
  border: 1px solid var(--aqua);
  opacity: 0.55;
  pointer-events: none;
}

.faq-hero__frame::before {
  top: -1px;
  left: -1px;
  border-right: 0;
  border-bottom: 0;
}

.faq-hero__frame::after {
  right: -1px;
  bottom: -1px;
  border-top: 0;
  border-left: 0;
}

.faq-hero__ticks {
  height: 10px;
  margin-bottom: clamp(16px, 2.6vw, 26px);
  background-image: repeating-linear-gradient(90deg, var(--line) 0 1px, transparent 1px 32px);
}

.faq-hero__title {
  margin: 14px 0 0;
  max-width: 21ch;
  font-size: clamp(30px, 6.2vw, 66px);
  font-weight: 250;
  line-height: 1.14;
  letter-spacing: -0.03em;
}

.faq-hero__lede {
  margin: clamp(16px, 2.2vw, 26px) 0 0;
  max-width: 60ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.8;
  color: var(--mist);
}

.faq-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: clamp(22px, 3vw, 34px);
}

.faq-jump__link {
  display: inline-flex;
  align-items: center;
  padding: 8px 14px;
  border: 1px solid var(--line);
  color: var(--white);
  font-size: 13px;
  letter-spacing: 0.04em;
  text-decoration: none;
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.faq-jump__link:hover,
.faq-jump__link:focus-visible {
  border-color: var(--aqua);
  color: var(--aqua);
  background: rgba(43, 224, 200, 0.08);
}

/* ---------- 顶部横幅 ---------- */
.faq-banner {
  position: relative;
  margin: 0;
  overflow: hidden;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.faq-banner__img {
  display: block;
  width: 100%;
  height: clamp(150px, 24vw, 300px);
  object-fit: cover;
  opacity: 0.55;
  filter: saturate(0.85);
}

.faq-banner__cap {
  position: absolute;
  right: var(--pad-x);
  bottom: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--mist);
}

/* ---------- 主体：索引 + 分组 ---------- */
.faq-body {
  display: grid;
  gap: clamp(28px, 4vw, 44px);
  padding-block: clamp(34px, 5vw, 72px);
}

.faq-index__list {
  display: flex;
  gap: 8px;
  margin: 12px 0 0;
  padding: 0 0 8px;
  list-style: none;
  overflow-x: auto;
}

.faq-index__item {
  flex: 0 0 auto;
}

.faq-index__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 14px;
  border: 1px solid var(--line);
  color: var(--mist);
  font-size: 14px;
  text-decoration: none;
  white-space: nowrap;
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.faq-index__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--aqua);
}

.faq-index__link:hover,
.faq-index__link:focus-visible {
  border-color: var(--aqua);
  color: var(--white);
  background: rgba(43, 224, 200, 0.07);
}

/* 分组 */
.faq-group {
  margin-bottom: clamp(38px, 5vw, 62px);
}

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

.faq-group__head {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: clamp(14px, 2vw, 22px);
}

.faq-group__num {
  flex: 0 0 auto;
  padding: 3px 7px;
  border: 1px solid rgba(255, 122, 47, 0.45);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--orange);
}

.faq-group__title {
  flex: 0 0 auto;
  margin: 0;
  font-size: clamp(19px, 2.6vw, 26px);
  font-weight: 300;
  letter-spacing: -0.01em;
}

.faq-group__head::after {
  content: "";
  flex: 1 1 auto;
  min-width: 28px;
  height: 8px;
  background-image: repeating-linear-gradient(115deg, var(--line) 0 5px, transparent 5px 11px);
}

/* 问题条目 */
.faq-item {
  position: relative;
  margin-bottom: 10px;
  border: 1px solid var(--line);
  background: var(--stand);
  clip-path: polygon(0 0, calc(100% - var(--faq-cut)) 0, 100% var(--faq-cut), 100% 100%, 0 100%);
  transition: border-color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.faq-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--lime);
  transform: scaleY(0);
  transform-origin: top center;
  transition: transform 0.24s var(--ease);
}

.faq-item:hover {
  border-color: rgba(43, 224, 200, 0.45);
}

.faq-item[open] {
  border-color: rgba(43, 224, 200, 0.38);
  background: var(--board);
}

.faq-item[open]::before {
  transform: scaleY(1);
}

.faq-item__q {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 18px clamp(16px, 2.4vw, 24px);
  cursor: pointer;
  list-style: none;
  font-size: clamp(15px, 1.6vw, 16.5px);
  font-weight: 500;
  line-height: 1.6;
  color: var(--white);
  transition: color 0.2s var(--ease);
}

.faq-item__q::-webkit-details-marker {
  display: none;
}

.faq-item__q::marker {
  content: "";
}

.faq-item__q:hover .faq-item__text {
  color: var(--aqua);
}

.faq-item__num {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.7;
  letter-spacing: 0.08em;
  color: var(--mist);
  transition: color 0.2s var(--ease);
}

.faq-item[open] .faq-item__num {
  color: var(--lime);
}

.faq-item__text {
  flex: 1 1 auto;
  min-width: 0;
  transition: color 0.2s var(--ease);
}

.faq-item__sign {
  position: relative;
  flex: 0 0 auto;
  width: 14px;
  height: 14px;
  margin-top: 5px;
}

.faq-item__sign::before,
.faq-item__sign::after {
  content: "";
  position: absolute;
  background: var(--aqua);
  transition: transform 0.2s var(--ease), opacity 0.2s var(--ease);
}

.faq-item__sign::before {
  left: 0;
  top: 6px;
  width: 14px;
  height: 2px;
}

.faq-item__sign::after {
  left: 6px;
  top: 0;
  width: 2px;
  height: 14px;
}

.faq-item[open] .faq-item__sign::after {
  transform: scaleY(0);
  opacity: 0;
}

.faq-item__a {
  padding: 0 clamp(16px, 2.4vw, 24px) 20px calc(clamp(16px, 2.4vw, 24px) + 34px);
  font-size: 15px;
  line-height: 1.85;
  color: var(--mist);
}

.faq-item__a p {
  margin: 0;
  max-width: 64ch;
}

.faq-item__a a {
  color: var(--aqua);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.faq-item__a a:hover {
  color: var(--lime);
}

@keyframes faq-answer-in {
  from {
    opacity: 0;
    transform: translateX(12px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@media (prefers-reduced-motion: no-preference) {
  .faq-item[open] .faq-item__a {
    animation: faq-answer-in 0.3s var(--ease);
  }
}

/* 阅读体验区块 */
.faq-reading__body {
  display: grid;
  gap: clamp(20px, 3vw, 30px);
}

.faq-figure {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--ink-deep);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--faq-cut)), calc(100% - var(--faq-cut)) 100%, 0 100%);
}

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

.faq-figure figcaption {
  padding: 10px 18px 16px 14px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 收尾引导 ---------- */
.faq-cta {
  margin-top: clamp(26px, 4vw, 56px);
  border-top: 1px solid var(--line);
  background: linear-gradient(160deg, var(--stand) 0%, var(--ink) 72%);
}

.faq-cta__inner {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  padding-block: clamp(38px, 6vw, 78px);
}

.faq-cta__title {
  margin: 12px 0 0;
  max-width: 20ch;
  font-size: clamp(24px, 3.6vw, 40px);
  font-weight: 250;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.faq-cta__lede {
  margin: 16px 0 0;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

.faq-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.faq-cta__links {
  display: grid;
  align-content: end;
}

.faq-cta__links a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 13px 0;
  border-bottom: 1px solid var(--line);
  color: var(--white);
  font-size: 15px;
  text-decoration: none;
  transition: color 0.2s var(--ease), padding-left 0.2s var(--ease);
}

.faq-cta__links a::after {
  content: "↗";
  font-family: var(--font-mono);
  color: var(--aqua);
}

.faq-cta__links a:first-child {
  border-top: 1px solid var(--line);
}

.faq-cta__links a:hover,
.faq-cta__links a:focus-visible {
  color: var(--aqua);
  padding-left: 6px;
}

/* ---------- 返回顶部 ---------- */
.faq-top {
  position: fixed;
  right: clamp(14px, 3vw, 32px);
  bottom: clamp(14px, 3vw, 32px);
  z-index: 40;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  border: 1px solid var(--aqua);
  background: var(--ink-deep);
  color: var(--aqua);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 0 100%);
  transition: opacity 0.24s var(--ease), transform 0.24s var(--ease), visibility 0.24s var(--ease), color 0.2s var(--ease);
}

.faq-top[data-visible],
.faq-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: none;
}

.faq-top:hover,
.faq-top:focus-visible {
  color: var(--lime);
  border-color: var(--lime);
}

.faq-top__arrow {
  font-size: 14px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .faq-cta__links {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 32px;
  }
}

@media (min-width: 960px) {
  .faq-body {
    grid-template-columns: 232px minmax(0, 1fr);
    align-items: start;
    gap: clamp(40px, 4vw, 72px);
  }

  .faq-index {
    position: sticky;
    top: calc(var(--bar-h) + 24px);
  }

  .faq-index__list {
    flex-direction: column;
    gap: 0;
    padding: 0;
    overflow: visible;
  }

  .faq-index__item {
    flex: none;
  }

  .faq-index__link {
    display: flex;
    width: 100%;
    padding: 12px 0 12px 12px;
    border: 0;
    border-bottom: 1px solid var(--line);
    border-left: 2px solid transparent;
    white-space: normal;
  }

  .faq-index__link:hover,
  .faq-index__link:focus-visible {
    border-left-color: var(--lime);
    background: rgba(140, 255, 90, 0.05);
  }

  .faq-cta__inner {
    grid-template-columns: minmax(0, 1fr) 300px;
    align-items: end;
  }

  .faq-cta__links {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (min-width: 1080px) {
  .faq-reading__body {
    grid-template-columns: minmax(0, 1fr) 300px;
    align-items: start;
  }
}
<<<END>>>