.page-faq {
  --faq-line: rgba(18, 50, 79, 0.14);
  --faq-band-bg: rgba(169, 203, 224, 0.26);
  --faq-sticky-top: 96px;
  display: block;
  background: var(--snow-50);
  color: var(--ink-900);
  font-family: var(--font-sans);
  overflow-x: hidden;
}

.page-faq .faq-filter__input {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* 面包屑 */
.page-faq .faq-crumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 22px 0 0;
  font-size: var(--fs-13);
  color: var(--slate);
}

.page-faq .faq-crumb li {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.page-faq .faq-crumb li + li::before {
  content: "/";
  color: var(--mist);
}

.page-faq .faq-crumb a {
  color: var(--blue-600);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.page-faq .faq-crumb a:hover {
  border-bottom-color: var(--blue-600);
}

/* 首屏 */
.page-faq .faq-hero {
  padding: 20px 0 26px;
  border-bottom: var(--rule);
}

.page-faq .faq-hero .eyebrow {
  margin: 0;
  font-family: var(--font-latin);
  font-size: var(--fs-13);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--maple-dark);
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.page-faq .faq-hero .eyebrow::before {
  content: "";
  width: 26px;
  height: 2px;
  background: var(--maple);
  display: inline-block;
}

.page-faq .faq-hero h1 {
  margin: 14px 0 16px;
  font-size: var(--fs-40);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.18;
  max-width: 18em;
  color: var(--ink-900);
}

.page-faq .faq-hero__lede {
  margin: 0;
  max-width: 36em;
  font-size: var(--fs-17);
  line-height: 1.75;
  color: var(--ink-800);
}

.page-faq .faq-hero__hint {
  margin: 14px 0 0;
  font-size: var(--fs-15);
  color: var(--slate);
  padding-left: 12px;
  border-left: 2px solid var(--blue-300);
}

/* 分类索引带 */
.page-faq .faq-filter {
  margin: 26px 0 0;
}

.page-faq .faq-filter__band {
  display: flex;
  gap: 6px;
  align-items: stretch;
  overflow-x: auto;
  background: var(--ink-900);
  padding: 8px;
  border-radius: var(--radius);
  -webkit-overflow-scrolling: touch;
}

.page-faq .faq-filter__band label {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 11px 14px;
  border-radius: 2px;
  border-bottom: 2px solid transparent;
  color: rgba(244, 248, 251, 0.76);
  font-size: var(--fs-15);
  line-height: 1;
  white-space: nowrap;
  cursor: pointer;
  transition: color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.page-faq .faq-filter__band label:hover {
  color: var(--snow-50);
  background: rgba(169, 203, 224, 0.12);
}

.page-faq .faq-filter__band .mono {
  font-size: var(--fs-13);
  opacity: 0.62;
}

.page-faq .faq-filter__count {
  padding-left: 8px;
  border-left: 1px solid rgba(244, 248, 251, 0.24);
  opacity: 0.72;
}

/* 索引图 */
.page-faq .faq-index-media {
  margin: 18px 0 0;
}

.page-faq .faq-index-media img {
  display: block;
  width: 100%;
  height: auto;
  border: var(--rule);
  border-radius: var(--radius);
  background: var(--paper);
}

/* 主体布局 */
.page-faq .faq-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
  padding: 32px 0 40px;
}

.page-faq .faq-toc {
  border-top: 3px solid var(--ink-800);
  padding-top: 14px;
}

.page-faq .faq-toc__title {
  margin: 0 0 12px;
  font-family: var(--font-latin);
  font-size: var(--fs-13);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--slate);
}

.page-faq .faq-toc__item {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  padding: 11px 0 11px 12px;
  border-left: 2px solid var(--mist);
  font-size: var(--fs-15);
  color: var(--ink-800);
  cursor: pointer;
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.page-faq .faq-toc__item:hover {
  border-left-color: var(--blue-600);
  color: var(--blue-600);
  background: rgba(169, 203, 224, 0.16);
}

.page-faq .faq-toc__item .mono {
  font-size: var(--fs-13);
  color: var(--slate);
}

.page-faq .faq-toc__note {
  margin: 14px 0 0;
  font-size: var(--fs-13);
  line-height: 1.6;
  color: var(--slate);
}

/* 分类分组 */
.page-faq .faq-group + .faq-group {
  margin-top: 40px;
}

.page-faq .faq-group__band {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px 18px;
  background: var(--faq-band-bg);
  border-left: 3px solid var(--blue-600);
  padding: 13px 16px;
  margin: 0 0 16px;
}

.page-faq .faq-group__band h2 {
  margin: 0;
  font-size: var(--fs-20);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--ink-900);
}

.page-faq .faq-group__count {
  font-size: var(--fs-13);
  color: var(--ink-800);
  opacity: 0.8;
  white-space: nowrap;
}

/* 路径示意图 */
.page-faq .faq-figure {
  margin: 0 0 18px;
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  height: auto;
  border: var(--rule);
  border-radius: var(--radius);
  background: var(--paper);
}

.page-faq .faq-figure figcaption {
  margin-top: 9px;
  font-size: var(--fs-13);
  color: var(--slate);
  line-height: 1.6;
}

/* 问答条目 */
.page-faq .faq-item {
  background: var(--paper);
  border: 1px solid var(--faq-line);
  border-radius: var(--radius);
  margin-bottom: 8px;
  transition: border-color 0.2s var(--ease);
}

.page-faq .faq-item:hover {
  border-color: var(--blue-300);
}

.page-faq .faq-item summary {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 14px 40px 14px 16px;
  position: relative;
  list-style: none;
  cursor: pointer;
  font-size: var(--fs-17);
  font-weight: 500;
  line-height: 1.55;
  color: var(--ink-900);
}

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

.page-faq .faq-item summary::after {
  content: "+";
  position: absolute;
  right: 16px;
  top: 14px;
  font-family: var(--font-mono);
  font-size: var(--fs-17);
  line-height: 1.55;
  color: var(--blue-600);
}

.page-faq .faq-item[open] summary::after {
  content: "\2212";
  color: var(--maple);
}

.page-faq .faq-item[open] summary {
  border-bottom: 1px solid var(--faq-line);
}

.page-faq .faq-item__no {
  flex: 0 0 auto;
  margin-top: 2px;
  padding: 1px 5px;
  border: 1px solid var(--blue-300);
  border-radius: 2px;
  font-size: var(--fs-13);
  line-height: 1.5;
  color: var(--blue-600);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-faq .faq-item[open] .faq-item__no {
  color: var(--maple);
  border-color: var(--maple);
}

.page-faq .faq-item__body {
  padding: 15px 16px 16px;
  background: var(--paper);
  font-size: var(--fs-15);
  line-height: 1.75;
  color: var(--slate);
}

.page-faq .faq-item__body p {
  margin: 0 0 9px;
  max-width: 38em;
}

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

.page-faq .faq-item__body a {
  color: var(--blue-600);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.page-faq .faq-item__body a:hover {
  color: var(--maple-dark);
}

.page-faq .faq-item__next {
  margin-top: 12px !important;
  padding-top: 10px;
  border-top: 1px dashed var(--mist);
  font-size: var(--fs-13);
  color: var(--ink-800);
}

/* 人工协助 */
.page-faq .faq-help {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
  background: var(--ink-900);
  color: var(--snow-50);
  padding: 26px 20px;
  border-radius: var(--radius);
  margin: 8px 0 56px;
}

.page-faq .faq-help__label {
  margin: 0 0 10px;
  font-family: var(--font-latin);
  font-size: var(--fs-13);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--blue-300);
}

.page-faq .faq-help h2 {
  margin: 0 0 12px;
  font-size: var(--fs-26);
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.3;
  color: var(--snow-50);
}

.page-faq .faq-help__text p {
  margin: 0;
  font-size: var(--fs-15);
  line-height: 1.75;
  color: rgba(244, 248, 251, 0.82);
  max-width: 34em;
}

.page-faq .faq-help__list {
  margin: 0 0 18px;
  display: grid;
  gap: 10px;
}

.page-faq .faq-help__list > div {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 4px 16px;
  padding-bottom: 9px;
  border-bottom: 1px solid rgba(169, 203, 224, 0.24);
}

.page-faq .faq-help__list dt {
  font-size: var(--fs-13);
  color: var(--blue-300);
}

.page-faq .faq-help__list dd {
  margin: 0;
  font-size: var(--fs-15);
  color: var(--snow-50);
}

.page-faq .faq-help__side .btn {
  display: inline-block;
}

/* 过滤联动 */
.page-faq #cat-query:checked ~ .faq-shell .faq-group:not([data-cat="query"]),
.page-faq #cat-review:checked ~ .faq-shell .faq-group:not([data-cat="review"]),
.page-faq #cat-device:checked ~ .faq-shell .faq-group:not([data-cat="device"]),
.page-faq #cat-contact:checked ~ .faq-shell .faq-group:not([data-cat="contact"]) {
  display: none;
}

.page-faq #cat-query:checked ~ .faq-shell label[for="cat-query"],
.page-faq #cat-review:checked ~ .faq-shell label[for="cat-review"],
.page-faq #cat-device:checked ~ .faq-shell label[for="cat-device"],
.page-faq #cat-contact:checked ~ .faq-shell label[for="cat-contact"],
.page-faq #cat-all:checked ~ .faq-shell label[for="cat-all"] {
  color: var(--paper);
  border-bottom-color: var(--maple);
  background: rgba(200, 16, 46, 0.18);
}

.page-faq #cat-query:checked ~ .faq-shell .faq-toc__item[for="cat-query"],
.page-faq #cat-review:checked ~ .faq-shell .faq-toc__item[for="cat-review"],
.page-faq #cat-device:checked ~ .faq-shell .faq-toc__item[for="cat-device"],
.page-faq #cat-contact:checked ~ .faq-shell .faq-toc__item[for="cat-contact"],
.page-faq #cat-all:checked ~ .faq-shell .faq-toc__item[for="cat-all"] {
  border-left-color: var(--maple);
  color: var(--maple-dark);
  background: rgba(200, 16, 46, 0.06);
  font-weight: 600;
}

/* 键盘焦点 */
.page-faq #cat-all:focus-visible ~ .faq-shell label[for="cat-all"],
.page-faq #cat-query:focus-visible ~ .faq-shell label[for="cat-query"],
.page-faq #cat-review:focus-visible ~ .faq-shell label[for="cat-review"],
.page-faq #cat-device:focus-visible ~ .faq-shell label[for="cat-device"],
.page-faq #cat-contact:focus-visible ~ .faq-shell label[for="cat-contact"] {
  outline: 2px solid var(--blue-300);
  outline-offset: 2px;
}

@media (min-width: 720px) {
  .page-faq .faq-hero h1 {
    font-size: var(--fs-56);
  }

  .page-faq .faq-filter__band {
    gap: 10px;
    padding: 10px;
  }

  .page-faq .faq-toc {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0 18px;
    align-items: start;
  }

  .page-faq .faq-toc__title,
  .page-faq .faq-toc__note {
    grid-column: 1 / -1;
  }

  .page-faq .faq-help {
    grid-template-columns: 1.15fr 0.85fr;
    gap: 32px;
    padding: 34px 32px;
  }

  .page-faq .faq-help h2 {
    font-size: var(--fs-32);
  }
}

@media (min-width: 980px) {
  .page-faq .faq-layout {
    grid-template-columns: 216px minmax(0, 1fr);
    gap: 56px;
    padding: 52px 0 64px;
  }

  .page-faq .faq-toc {
    position: sticky;
    top: var(--faq-sticky-top);
    align-self: start;
    display: block;
  }

  .page-faq .faq-toc__item + .faq-toc__item {
    margin-top: 2px;
  }

  .page-faq .faq-group + .faq-group {
    margin-top: 52px;
  }

  .page-faq .faq-help {
    padding: 44px 48px;
    margin-bottom: 64px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-filter__band label,
  .page-faq .faq-toc__item,
  .page-faq .faq-item,
  .page-faq .faq-item__no {
    transition: none;
  }
}
<<<END>>>