.page-faq {
  --faq-side-w: 268px;
  color: var(--by-text);
}

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

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(22px, 3.6vw, 36px) clamp(34px, 5vw, 60px);
  border-bottom: 1px solid var(--by-line);
  background:
    repeating-linear-gradient(90deg, rgba(42, 59, 51, 0.42) 0 1px, transparent 1px 64px),
    repeating-linear-gradient(0deg, rgba(42, 59, 51, 0.32) 0 1px, transparent 1px 64px),
    radial-gradient(130% 90% at 88% -10%, rgba(199, 255, 61, 0.12), transparent 62%),
    radial-gradient(90% 70% at 0% 100%, rgba(255, 107, 61, 0.08), transparent 60%),
    var(--by-forest);
}

.page-faq .faq-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 44px);
  align-items: end;
  margin-top: clamp(18px, 3vw, 30px);
}

.page-faq .faq-hero__title {
  margin: 14px 0 0;
  font-family: var(--by-font-display);
  font-size: clamp(30px, 6vw, 60px);
  font-weight: 800;
  line-height: 1.04;
  letter-spacing: -0.015em;
  text-wrap: balance;
}

.page-faq .faq-hero__mark {
  color: var(--by-lime);
  font-style: normal;
}

.page-faq .faq-hero__lede {
  margin-top: 18px;
  max-width: 62ch;
  color: var(--by-muted);
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.8;
}

.page-faq .faq-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 28px);
}

.page-faq .faq-hero__media {
  position: relative;
  margin: 0;
  border: 1px solid var(--by-line);
  border-radius: var(--by-radius);
  box-shadow: var(--by-shadow);
}

.page-faq .faq-hero__media img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  filter: saturate(0.85) contrast(1.05);
}

/* ---------- 分类索引 ---------- */
.page-faq .faq-index {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: clamp(26px, 4vw, 44px);
  background: var(--by-line);
  border: 1px solid var(--by-line);
  border-radius: var(--by-radius);
  overflow: hidden;
}

.page-faq .faq-index__item {
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-areas:
    "num icon"
    "title title"
    "desc desc";
  gap: 6px 10px;
  align-content: start;
  padding: 16px 16px 18px;
  background: var(--by-panel);
  color: var(--by-text);
  text-decoration: none;
  transition: background 160ms var(--by-ease), transform 160ms var(--by-ease);
}

.page-faq .faq-index__num {
  grid-area: num;
  align-self: center;
  font-family: var(--by-font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--by-lime);
}

.page-faq .faq-index__icon {
  grid-area: icon;
  justify-self: end;
  width: 22px;
  height: 22px;
  color: var(--by-dim);
  transition: color 160ms var(--by-ease);
}

.page-faq .faq-index__title {
  grid-area: title;
  margin-top: 4px;
  font-family: var(--by-font-display);
  font-size: 19px;
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: 0.01em;
}

.page-faq .faq-index__desc {
  grid-area: desc;
  color: var(--by-muted);
  font-size: 13px;
  line-height: 1.6;
}

.page-faq .faq-index__item:hover,
.page-faq .faq-index__item:focus-visible {
  background: var(--by-panel-2);
}

.page-faq .faq-index__item:hover .faq-index__icon,
.page-faq .faq-index__item:focus-visible .faq-index__icon {
  color: var(--by-lime);
}

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

/* ---------- 主体两栏 ---------- */
.page-faq .faq-body {
  padding-block: clamp(32px, 4.5vw, 56px) clamp(48px, 6vw, 84px);
}

.page-faq .faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 3.4vw, 48px);
  align-items: start;
}

/* ---------- 侧栏目录 ---------- */
.page-faq .faq-toc {
  padding: 16px 14px;
  border: 1px solid var(--by-line);
  border-radius: var(--by-radius);
  background: var(--by-glass);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.page-faq .faq-toc .by-toc__title {
  margin: 0 0 10px;
  font-family: var(--by-font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--by-dim);
}

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

.page-faq .faq-toc .by-toc__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 10px;
  border-left: 2px solid transparent;
  color: var(--by-muted);
  font-size: 14px;
  line-height: 1.5;
  text-decoration: none;
  transition: color 160ms var(--by-ease), border-color 160ms var(--by-ease), background 160ms var(--by-ease);
}

.page-faq .faq-toc__num {
  font-family: var(--by-font-mono);
  font-size: 11px;
  color: var(--by-dim);
  transition: color 160ms var(--by-ease);
}

.page-faq .faq-toc .by-toc__link:hover {
  color: var(--by-text);
  border-left-color: var(--by-line);
  background: rgba(199, 255, 61, 0.05);
}

.page-faq .faq-toc .by-toc__link[aria-current="true"] {
  color: var(--by-lime);
  border-left-color: var(--by-lime);
  background: rgba(199, 255, 61, 0.08);
}

.page-faq .faq-toc .by-toc__link[aria-current="true"] .faq-toc__num {
  color: var(--by-lime);
}

.page-faq .faq-toc .by-toc__link:focus-visible {
  outline: 2px solid var(--by-focus);
  outline-offset: 2px;
}

.page-faq .faq-side__box {
  margin-top: 14px;
  padding: 14px 15px 16px;
  border: 1px solid var(--by-line);
  border-left: 2px solid var(--by-ember);
  border-radius: var(--by-radius);
  background: var(--by-panel);
}

.page-faq .faq-side__label {
  margin: 0;
  font-family: var(--by-font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--by-dim);
}

.page-faq .faq-side__value {
  margin: 6px 0 0;
  font-family: var(--by-font-mono);
  font-size: 15px;
  color: var(--by-text);
}

.page-faq .faq-side__hint {
  margin: 8px 0 0;
  color: var(--by-muted);
  font-size: 12.5px;
  line-height: 1.65;
}

/* ---------- 问答分组 ---------- */
.page-faq .faq-group {
  padding-block: clamp(24px, 3.4vw, 34px);
  border-top: 1px solid var(--by-line);
  scroll-margin-top: calc(var(--by-header-h) + 20px);
}

.page-faq .faq-group:first-child {
  border-top: none;
  padding-top: 0;
}

.page-faq .faq-group__head {
  display: grid;
  gap: 8px;
  margin-bottom: 14px;
}

.page-faq .faq-group__index {
  margin: 0;
  padding-left: 10px;
  border-left: 3px solid var(--by-lime);
  font-family: var(--by-font-mono);
  font-size: 11.5px;
  letter-spacing: 0.18em;
  color: var(--by-lime);
}

.page-faq .faq-group__title {
  margin: 0;
  font-family: var(--by-font-display);
  font-size: clamp(23px, 3.1vw, 33px);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -0.01em;
  text-wrap: balance;
}

.page-faq .faq-group__note {
  margin: 0;
  max-width: 66ch;
  color: var(--by-muted);
  font-size: 14px;
  line-height: 1.75;
}

.page-faq .faq-figure {
  position: relative;
  margin: 0 0 18px;
  border: 1px solid var(--by-line);
  border-radius: var(--by-radius);
  overflow: hidden;
}

.page-faq .faq-figure img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

/* ---------- 手风琴 ---------- */
.page-faq .faq-list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--by-line);
}

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

.page-faq .faq-item__q {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 15px 2px 15px 0;
  cursor: pointer;
  list-style: none;
}

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

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

.page-faq .faq-item__num {
  flex: none;
  min-width: 24px;
  padding-top: 3px;
  font-family: var(--by-font-mono);
  font-size: 12px;
  color: var(--by-dim);
  transition: color 200ms var(--by-ease);
}

.page-faq .faq-item__text {
  flex: 1 1 auto;
  min-width: 0;
  color: var(--by-text);
  font-size: clamp(15px, 1.6vw, 17px);
  font-weight: 600;
  line-height: 1.6;
  transition: color 160ms var(--by-ease);
}

.page-faq .faq-item__sign {
  position: relative;
  flex: none;
  width: 15px;
  height: 15px;
  margin-top: 6px;
}

.page-faq .faq-item__sign::before,
.page-faq .faq-item__sign::after {
  content: "";
  position: absolute;
  background: var(--by-lime);
  transition: transform 220ms var(--by-ease), opacity 220ms var(--by-ease);
}

.page-faq .faq-item__sign::before {
  top: 50%;
  left: 0;
  right: 0;
  height: 1.5px;
  transform: translateY(-50%);
}

.page-faq .faq-item__sign::after {
  top: 0;
  bottom: 0;
  left: 50%;
  width: 1.5px;
  transform: translateX(-50%);
}

.page-faq .faq-item__a {
  padding: 0 4px 18px 36px;
}

.page-faq .faq-item__a p {
  margin: 0;
  max-width: 68ch;
  color: var(--by-muted);
  font-size: 15px;
  line-height: 1.8;
}

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

.page-faq .faq-item[open] .faq-item__sign::after {
  opacity: 0;
  transform: translateX(-50%) rotate(90deg);
}

.page-faq .faq-item:hover .faq-item__text {
  color: var(--by-focus);
}

/* ---------- 联系区块 ---------- */
.page-faq .faq-contact {
  margin-top: clamp(30px, 4vw, 48px);
  position: relative;
  overflow: hidden;
  border: 1px solid var(--by-line);
  border-radius: var(--by-radius);
  background:
    linear-gradient(140deg, var(--by-panel) 0%, var(--by-forest) 100%);
}

.page-faq .faq-contact::after {
  content: "";
  position: absolute;
  top: -60%;
  right: -18%;
  width: 320px;
  height: 320px;
  background: rgba(199, 255, 61, 0.06);
  transform: rotate(24deg);
  pointer-events: none;
}

.page-faq .faq-contact__inner {
  position: relative;
  z-index: 1;
  padding: clamp(20px, 3.2vw, 34px);
}

.page-faq .faq-contact__title {
  margin: 10px 0 0;
  font-family: var(--by-font-display);
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 800;
  line-height: 1.2;
}

.page-faq .faq-contact__text {
  margin: 12px 0 0;
  max-width: 64ch;
  color: var(--by-muted);
  font-size: 14.5px;
  line-height: 1.8;
}

.page-faq .faq-contact__facts {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: clamp(20px, 3vw, 28px) 0 0;
  background: var(--by-line);
  border: 1px solid var(--by-line);
  border-radius: var(--by-radius);
  overflow: hidden;
}

.page-faq .faq-contact__fact {
  padding: 13px 15px 15px;
  background: var(--by-panel-2);
}

.page-faq .faq-contact__fact dt {
  font-family: var(--by-font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--by-dim);
}

.page-faq .faq-contact__fact dd {
  margin: 7px 0 0;
  font-family: var(--by-font-mono);
  font-size: 14.5px;
  line-height: 1.5;
  color: var(--by-text);
  word-break: break-word;
}

.page-faq .faq-contact__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(18px, 2.6vw, 26px);
}

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

  .page-faq .faq-contact__facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-faq .faq-item__a {
    padding-left: 38px;
  }
}

@media (min-width: 940px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  }
}

@media (min-width: 1000px) {
  .page-faq .faq-index {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .page-faq .faq-layout {
    grid-template-columns: var(--faq-side-w) minmax(0, 1fr);
    gap: clamp(36px, 4vw, 56px);
  }

  .page-faq .faq-side {
    position: sticky;
    top: calc(var(--by-header-h) + 24px);
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-index__item,
  .page-faq .faq-toc .by-toc__link,
  .page-faq .faq-item__text,
  .page-faq .faq-item__num,
  .page-faq .faq-item__sign::before,
  .page-faq .faq-item__sign::after {
    transition: none;
  }
}
<<<END>>>