.page-faq {
  --faq-cut: 16px;
  --faq-accent-line: rgba(70, 242, 210, 0.35);
  background: var(--deep);
  color: var(--mist);
  padding-inline: clamp(16px, 4vw, 48px);
  padding-bottom: clamp(48px, 8vw, 96px);
}

/* ===== 首屏 ===== */
.page-faq .faq-hero {
  padding-block: clamp(28px, 5vw, 56px) clamp(20px, 3vw, 32px);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(120% 90% at 88% 0%, rgba(70, 242, 210, 0.13), transparent 62%),
    radial-gradient(90% 70% at 0% 100%, rgba(242, 184, 75, 0.08), transparent 60%),
    var(--scan);
}

.page-faq .faq-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 4vw, 40px);
  align-items: end;
}

.page-faq .faq-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5.6vw, 3.9rem);
  line-height: 1.04;
  letter-spacing: -0.03em;
  font-weight: 700;
  color: var(--ivory);
  margin: 12px 0 18px;
}

.page-faq .faq-hero__lead {
  max-width: 48ch;
  margin: 0;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--mist);
}

.page-faq .faq-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 26px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.03em;
  color: var(--stone);
}

.page-faq .faq-hero__facts li {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding-left: 10px;
  border-left: 2px solid var(--cyan);
}

.page-faq .faq-hero__facts li > .data-num {
  font-size: 1rem;
  color: var(--amber);
  letter-spacing: 0;
}

.page-faq .faq-hero__art {
  position: relative;
  margin: 0;
  background: var(--night);
  overflow: hidden;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--faq-cut)), calc(100% - var(--faq-cut)) 100%, 0 100%);
}

.page-faq .faq-hero__art img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 10 / 7;
  object-fit: cover;
}

.page-faq .faq-hero__art::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(6, 24, 38, 0) 42%, rgba(6, 24, 38, 0.62) 100%);
  pointer-events: none;
}

/* ===== 主题筛选 ===== */
.page-faq .faq-filter {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-block: clamp(16px, 3vw, 24px);
}

.page-faq .faq-filter__label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: var(--stone);
  margin-right: 4px;
}

.page-faq .faq-filter__input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.page-faq .faq-filter__chip {
  display: inline-flex;
  align-items: center;
  padding: 8px 16px;
  font-size: 0.84rem;
  line-height: 1.2;
  color: var(--mist);
  border: 1px solid var(--line-strong);
  cursor: pointer;
  user-select: none;
  clip-path: polygon(9px 0, 100% 0, 100% calc(100% - 9px), calc(100% - 9px) 100%, 0 100%, 0 9px);
  transition: background 180ms ease, color 180ms ease, border-color 180ms ease;
}

.page-faq .faq-filter__chip:hover {
  border-color: var(--cyan);
  color: var(--ivory);
}

.page-faq .faq-filter__input:checked + .faq-filter__chip {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--deep);
  font-weight: 700;
}

.page-faq .faq-filter__input:focus-visible + .faq-filter__chip {
  outline: 2px solid var(--amber);
  outline-offset: 3px;
}

/* 筛选生效 */
.page-faq:has(#faq-topic-benefits:checked) .faq-block:not([data-cat="benefits"]),
.page-faq:has(#faq-topic-device:checked) .faq-block:not([data-cat="device"]),
.page-faq:has(#faq-topic-notice:checked) .faq-block:not([data-cat="notice"]),
.page-faq:has(#faq-topic-support:checked) .faq-block:not([data-cat="support"]) {
  display: none;
}

/* ===== 双栏骨架 ===== */
.page-faq .faq-shell {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 48px);
  padding-top: clamp(20px, 3vw, 32px);
}

/* ===== 左侧目录 ===== */
.page-faq .faq-rail {
  border-top: 2px solid var(--amber);
  padding-top: 14px;
}

.page-faq .faq-rail__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  color: var(--stone);
}

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

.page-faq .faq-rail__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 10px;
  font-size: 0.9rem;
  line-height: 1.5;
  color: var(--mist);
  text-decoration: none;
  border-left: 1px solid var(--line);
  transition: background 180ms ease, border-color 180ms ease, color 180ms ease;
}

.page-faq .faq-rail__link:hover,
.page-faq .faq-rail__link:focus-visible {
  background: rgba(70, 242, 210, 0.09);
  border-left-color: var(--cyan);
  color: var(--ivory);
}

.page-faq .faq-rail__num {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--cyan);
}

.page-faq .faq-rail__note {
  margin-top: 20px;
  padding: 14px 14px 16px;
  background: var(--night);
  border-left: 3px solid var(--cyan);
}

.page-faq .faq-rail__note-title {
  margin: 0 0 8px;
  font-size: 0.86rem;
  font-weight: 700;
  color: var(--ivory);
}

.page-faq .faq-rail__note-line {
  margin: 0 0 4px;
  font-size: 0.78rem;
  line-height: 1.6;
  color: var(--stone);
  word-break: break-all;
}

.page-faq .faq-rail__note-line.data-num {
  font-size: 0.86rem;
  color: var(--amber);
  word-break: normal;
}

.page-faq .faq-rail__note-link {
  display: inline-block;
  margin-top: 8px;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--faq-accent-line);
  padding-bottom: 1px;
}

.page-faq .faq-rail__note-link:hover {
  color: var(--amber);
}

/* ===== 问答区块 ===== */
.page-faq .faq-block {
  margin-bottom: clamp(32px, 5vw, 52px);
  scroll-margin-top: 88px;
}

.page-faq .faq-block__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 14px;
  padding-bottom: 12px;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--line-strong);
}

.page-faq .faq-block__head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.25rem, 2.8vw, 1.7rem);
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--ivory);
}

.page-faq .faq-block__kicker {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  color: var(--amber);
}

/* ===== 手风琴条目 ===== */
.page-faq .faq-item {
  position: relative;
  margin-bottom: 8px;
  background: var(--ivory);
  color: var(--ink);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
  transition: background 200ms ease;
}

.page-faq .faq-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--stone);
  transition: background 200ms ease;
}

.page-faq .faq-item[open] {
  background: #FBF8F0;
}

.page-faq .faq-item[open]::before {
  background: var(--amber);
}

.page-faq .faq-item__q {
  position: relative;
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 15px 44px 15px 18px;
  cursor: pointer;
  list-style: none;
  font-size: 0.96rem;
  font-weight: 600;
  line-height: 1.6;
  color: var(--ink);
}

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

.page-faq .faq-item__q:focus-visible {
  outline: 2px solid var(--night);
  outline-offset: -3px;
}

.page-faq .faq-item__no {
  flex: 0 0 auto;
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--moss);
}

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

.page-faq .faq-item__mark {
  position: absolute;
  right: 16px;
  top: 18px;
  width: 12px;
  height: 12px;
}

.page-faq .faq-item__mark::before,
.page-faq .faq-item__mark::after {
  content: "";
  position: absolute;
  background: var(--night);
  transition: transform 200ms ease, background 200ms ease;
}

.page-faq .faq-item__mark::before {
  left: 0;
  top: 5px;
  width: 12px;
  height: 2px;
}

.page-faq .faq-item__mark::after {
  left: 5px;
  top: 0;
  width: 2px;
  height: 12px;
}

.page-faq .faq-item[open] .faq-item__mark::after {
  transform: rotate(90deg);
}

.page-faq .faq-item[open] .faq-item__mark::before,
.page-faq .faq-item[open] .faq-item__mark::after {
  background: var(--clay);
}

.page-faq .faq-item__a {
  padding: 0 18px 18px;
  font-size: 0.93rem;
  line-height: 1.85;
  color: #2B343B;
}

.page-faq .faq-item__a p {
  margin: 0 0 10px;
}

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

.page-faq .faq-item__a ul {
  margin: 0 0 10px;
  padding: 0;
  list-style: none;
}

.page-faq .faq-item__a li {
  position: relative;
  padding-left: 16px;
  margin-bottom: 6px;
}

.page-faq .faq-item__a li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.78em;
  width: 7px;
  height: 1px;
  background: var(--clay);
}

.page-faq .faq-item__next {
  margin-top: 14px;
}

.page-faq .faq-item__next a {
  display: inline-block;
  font-size: 0.84rem;
  font-weight: 700;
  color: var(--night);
  text-decoration: none;
  border-bottom: 1px solid var(--amber);
  padding-bottom: 2px;
  transition: color 180ms ease, border-color 180ms ease;
}

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

/* ===== 内嵌图 ===== */
.page-faq .faq-media {
  margin: 20px 0 0;
  background: var(--night);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--faq-cut)), calc(100% - var(--faq-cut)) 100%, 0 100%);
}

.page-faq .faq-media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-faq .faq-media figcaption {
  padding: 10px 16px 14px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  line-height: 1.6;
  letter-spacing: 0.02em;
  color: var(--stone);
}

/* ===== 断点 ===== */
@media (min-width: 620px) {
  .page-faq .faq-hero__facts {
    gap: 12px 32px;
  }
}

@media (min-width: 860px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.85fr);
  }
}

@media (min-width: 900px) {
  .page-faq .faq-shell {
    grid-template-columns: 208px minmax(0, 1fr);
    align-items: start;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: 24px;
  }
}

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