.page-faq {
  --faq-num: 34px;
  --faq-pad: 16px;
  background: var(--ink);
  color: var(--mist);
}

/* 首屏 */
.page-faq .faq-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(24px, 4vw, 44px) 0 clamp(32px, 5vw, 60px);
  background:
    radial-gradient(120% 90% at 88% -20%, rgb(43 240 196 / .10), transparent 58%),
    linear-gradient(165deg, var(--pine) 0%, var(--ink) 66%);
  border-bottom: 1px solid var(--line-soft);
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  right: 0;
  top: 0;
  bottom: 0;
  width: min(46%, 560px);
  background: linear-gradient(200deg, rgb(43 240 196 / .08), transparent 72%);
  clip-path: polygon(26% 0, 100% 0, 100% 100%, 0 100%);
  z-index: -1;
  pointer-events: none;
}

.page-faq .faq-hero__inner {
  display: grid;
  gap: clamp(16px, 2.4vw, 26px);
}

.page-faq .faq-hero__lead {
  max-width: 62ch;
}

.page-faq .faq-hero .display {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-size: clamp(2rem, 5.6vw, 3.9rem);
  line-height: 1.06;
  letter-spacing: .05em;
  color: var(--mist);
  max-width: 16ch;
}

.page-faq .faq-hero .lede {
  margin: 16px 0 0;
  max-width: 54ch;
  color: var(--moss);
  font-size: 16px;
  line-height: 1.75;
}

.page-faq .faq-hero__figure {
  margin: 0;
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--char);
}

.page-faq .faq-hero__figure::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), rgb(43 240 196 / 0) 72%);
  z-index: 1;
}

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

/* 主体双区 */
.page-faq .faq-body {
  padding: clamp(28px, 4.5vw, 64px) 0 clamp(48px, 7vw, 96px);
}

.page-faq .faq-body__grid {
  display: grid;
  gap: clamp(20px, 3vw, 34px);
}

/* 左栏索引 */
.page-faq .faq-index {
  padding: var(--faq-pad);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--glass-40);
  backdrop-filter: blur(10px);
}

.page-faq .faq-index .eyebrow {
  color: var(--moss);
}

.page-faq .faq-index__list {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: grid;
  gap: 6px;
}

.page-faq .faq-index__item {
  min-width: 0;
}

.page-faq .faq-index__link {
  display: grid;
  grid-template-columns: 2.4ch minmax(0, 1fr) auto;
  gap: 10px;
  align-items: baseline;
  padding: 10px 10px 10px 12px;
  border-left: 2px solid var(--line);
  color: var(--moss);
  text-decoration: none;
  font-size: 14px;
  line-height: 1.4;
  transition: color .2s var(--ease), border-color .2s var(--ease), background-color .2s var(--ease);
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  color: var(--mist);
  border-left-color: var(--cyan-40);
  background: var(--cyan-08);
}

.page-faq .faq-index__link:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -2px;
}

.page-faq .faq-index__link[aria-current="true"] {
  color: var(--cyan);
  border-left-color: var(--cyan);
  background: var(--cyan-08);
}

.page-faq .faq-index__idx,
.page-faq .faq-index__count {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
}

.page-faq .faq-index__count {
  color: var(--glass);
  filter: brightness(1.9);
}

.page-faq .faq-index__link[aria-current="true"] .faq-index__idx,
.page-faq .faq-index__link[aria-current="true"] .faq-index__count {
  color: var(--cyan);
}

.page-faq .faq-index__foot {
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid var(--line-soft);
}

.page-faq .faq-index__keys {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 10px;
}

/* 右栏问答 */
.page-faq .faq-group {
  scroll-margin-top: 96px;
}

.page-faq .faq-group + .faq-group {
  margin-top: clamp(30px, 4.5vw, 54px);
  padding-top: clamp(24px, 3.6vw, 40px);
  border-top: 1px solid var(--line-soft);
}

.page-faq .faq-group__head {
  display: grid;
  gap: 8px;
  margin-bottom: clamp(14px, 2vw, 20px);
}

.page-faq .faq-group__head .h2 {
  margin: 0;
  font-size: clamp(1.3rem, 2.6vw, 1.8rem);
  line-height: 1.2;
  letter-spacing: .04em;
  color: var(--mist);
}

.page-faq .faq-group__head p {
  margin: 0;
  color: var(--moss);
  font-size: 14px;
  line-height: 1.7;
  max-width: 44ch;
}

.page-faq .qa-list {
  display: grid;
  gap: 8px;
}

.page-faq .qa {
  border: 1px solid var(--line);
  border-left: 2px solid var(--line);
  border-radius: var(--radius);
  background: rgb(23 51 42 / .32);
  transition: border-color .2s var(--ease), background-color .2s var(--ease);
}

.page-faq .qa:hover {
  border-color: var(--glass);
}

.page-faq .qa[open] {
  border-color: var(--cyan-40);
  border-left-color: var(--cyan);
  background: var(--panel);
}

.page-faq .qa__q {
  display: grid;
  grid-template-columns: var(--faq-num) minmax(0, 1fr) 16px;
  gap: 10px;
  align-items: start;
  padding: 14px var(--faq-pad);
  cursor: pointer;
  list-style: none;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.6;
  color: var(--mist);
}

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

.page-faq .qa__q:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -2px;
}

.page-faq .qa__num {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: .06em;
  color: var(--moss);
  padding-top: 4px;
}

.page-faq .qa[open] .qa__num {
  color: var(--cyan);
}

.page-faq .qa__sign {
  position: relative;
  width: 14px;
  height: 14px;
  margin-top: 5px;
}

.page-faq .qa__sign::before,
.page-faq .qa__sign::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 50%;
  height: 2px;
  background: var(--moss);
  transform: translateY(-50%);
  transition: transform .2s var(--ease), background-color .2s var(--ease);
}

.page-faq .qa__sign::after {
  transform: translateY(-50%) rotate(90deg);
}

.page-faq .qa[open] .qa__sign::before {
  background: var(--cyan);
}

.page-faq .qa[open] .qa__sign::after {
  transform: translateY(-50%) rotate(0deg);
  background: var(--cyan);
}

.page-faq .qa__a {
  padding: 0 var(--faq-pad) 18px calc(var(--faq-pad) + var(--faq-num) + 10px);
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

.page-faq .qa__a > * {
  margin: 0;
}

.page-faq .qa__a > * + * {
  margin-top: 12px;
}

.page-faq .qa[open] .qa__a {
  animation: faqAnsIn .26s var(--ease) both;
}

@keyframes faqAnsIn {
  from {
    opacity: 0;
    transform: translateY(-6px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.page-faq .qa__a a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--cyan-40);
}

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

.page-faq .qa__a .hl {
  background: var(--cyan-08);
  color: var(--cyan);
  padding: 0 4px;
  border-radius: 1px;
  font-weight: 600;
  white-space: nowrap;
}

.page-faq .qa__steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
  counter-reset: faq-step;
}

.page-faq .qa__steps li {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 10px;
  align-items: baseline;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

.page-faq .qa__steps li::before {
  content: counter(faq-step, decimal-leading-zero);
  counter-increment: faq-step;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--cyan);
  text-align: center;
  border-bottom: 1px solid var(--cyan-40);
  padding-bottom: 2px;
}

/* 章节配图 */
.page-faq .faq-figure {
  margin: 0 0 16px;
  max-width: 680px;
  border: 1px solid var(--line);
  background: var(--char);
  overflow: hidden;
}

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

.page-faq .faq-figure figcaption {
  padding: 8px 12px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--moss);
  border-top: 1px solid var(--line-soft);
}

/* 支持区 */
.page-faq .faq-support {
  display: grid;
  gap: 14px;
  padding: clamp(18px, 3vw, 28px);
  border: 1px solid var(--line);
  border-left: 3px solid var(--orange);
  background:
    linear-gradient(120deg, var(--orange-10), transparent 62%),
    var(--pine);
}

.page-faq .faq-support .faq-group__head {
  margin-bottom: 0;
}

.page-faq .faq-support__lead {
  margin: 0;
  max-width: 56ch;
  color: var(--mist);
  font-size: 15px;
  line-height: 1.75;
}

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

.page-faq .faq-support__list li {
  display: grid;
  gap: 3px;
}

.page-faq .faq-support__k {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--moss);
}

.page-faq .faq-support__v {
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: .02em;
  color: var(--mist);
  overflow-wrap: anywhere;
}

.page-faq .faq-support__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  padding-top: 4px;
}

/* 平板与桌面 */
@media (min-width: 600px) {
  .page-faq .faq-support__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 960px) {
  .page-faq .faq-hero__inner {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-faq .faq-body__grid {
    grid-template-columns: minmax(220px, 0.32fr) minmax(0, 1fr);
    gap: clamp(32px, 4vw, 64px);
    align-items: start;
  }

  .page-faq .faq-index {
    position: sticky;
    top: 84px;
  }

  .page-faq .qa__q {
    font-size: 16px;
    padding: 16px var(--faq-pad);
  }

  .page-faq .qa__a {
    font-size: 16px;
  }
}

@media (max-width: 599px) {
  .page-faq .faq-index__list {
    grid-auto-flow: column;
    grid-auto-columns: 78%;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    gap: 8px;
    padding-bottom: 8px;
    -webkit-overflow-scrolling: touch;
  }

  .page-faq .faq-index__item {
    scroll-snap-align: start;
  }

  .page-faq .qa__q {
    grid-template-columns: 26px minmax(0, 1fr) 14px;
    gap: 8px;
    font-size: 14px;
  }

  .page-faq .qa__a {
    padding-left: var(--faq-pad);
    font-size: 14px;
  }

  .page-faq .qa__steps li {
    grid-template-columns: 26px minmax(0, 1fr);
    gap: 8px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa[open] .qa__a {
    animation: none;
  }

  .page-faq .qa__sign::before,
  .page-faq .qa__sign::after,
  .page-faq .qa,
  .page-faq .faq-index__link {
    transition: none;
  }
}
<<<END>>>