.page-faq {
  background: var(--ink-900);
  color: var(--paper);
  font-family: var(--font-sans);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  background-color: var(--ink-900);
  background-image:
    radial-gradient(120% 92% at 82% 8%, rgba(59, 231, 210, 0.14), transparent 60%),
    radial-gradient(90% 70% at 6% 96%, rgba(255, 122, 47, 0.10), transparent 62%),
    linear-gradient(to right, var(--grid-fine) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid-fine) 1px, transparent 1px);
  background-size: auto, auto, 80px 80px, 80px 80px;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-hero__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 5vw, 48px);
  padding-top: clamp(26px, 5vw, 56px);
  padding-bottom: clamp(44px, 6vw, 84px);
  align-items: end;
}

.page-faq .faq-hero__crumbs {
  margin-bottom: clamp(18px, 3vw, 30px);
}

.page-faq .faq-hero__title {
  margin: 12px 0 0;
  font-size: clamp(34px, 6.4vw, 68px);
  line-height: 1.05;
  letter-spacing: 0.03em;
  font-weight: 300;
}

.page-faq .faq-hero__lede {
  margin-top: clamp(16px, 2.4vw, 24px);
  color: var(--soft);
  font-size: 16px;
  line-height: 1.78;
  max-width: 46ch;
}

.page-faq .faq-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 34px);
}

.page-faq .faq-hero__figure {
  margin: 0;
  position: relative;
  border: 1px solid var(--line);
  background: var(--ink-800);
}

.page-faq .faq-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  filter: saturate(0.92) contrast(1.04);
}

.page-faq .faq-hero__figcap {
  display: block;
  padding: 10px 14px;
  border-top: 1px solid var(--line);
  font-size: 12px;
  color: var(--dim);
  letter-spacing: 0.06em;
}

.page-faq .faq-hero__figcap .yb-mono {
  color: var(--pulse);
  margin-right: 8px;
  font-size: 11px;
}

/* ---------- 分组跳转条 ---------- */
.page-faq .faq-jump {
  background: var(--ink-800);
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-jump__inner {
  padding-left: 0;
  padding-right: 0;
}

.page-faq .faq-jump__list {
  display: flex;
  margin: 0;
  padding: 0;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-faq .faq-jump__list::-webkit-scrollbar {
  display: none;
}

.page-faq .faq-jump__item {
  flex: 0 0 auto;
  border-right: 1px solid var(--line);
}

.page-faq .faq-jump__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 15px clamp(14px, 2vw, 22px);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--softer);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.page-faq .faq-jump__link .yb-mono {
  color: var(--pulse);
  font-size: 11px;
}

.page-faq .faq-jump__link:hover,
.page-faq .faq-jump__link:focus-visible {
  color: var(--paper);
  background: rgba(59, 231, 210, 0.08);
}

/* ---------- 问答主体 ---------- */
.page-faq .faq-shell {
  max-width: calc(760px + var(--pad-x) * 2);
  padding-top: clamp(44px, 6vw, 80px);
  padding-bottom: clamp(44px, 6vw, 72px);
}

.page-faq .faq-group {
  margin-bottom: clamp(40px, 5vw, 64px);
}

.page-faq .faq-group--last {
  margin-bottom: clamp(28px, 4vw, 44px);
}

.page-faq .faq-group__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line-strong);
}

.page-faq .faq-num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--pulse);
  padding-top: 8px;
}

.page-faq .faq-group__title {
  margin: 0;
  font-size: clamp(21px, 2.8vw, 31px);
  line-height: 1.24;
  letter-spacing: 0.04em;
  font-weight: 300;
  color: var(--paper);
}

.page-faq .faq-group__note {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--dim);
}

.page-faq .faq-list {
  margin: 0;
  padding: 0;
  border-top: 1px solid transparent;
}

/* ---------- 单条问题 ---------- */
.page-faq .faq-item {
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-item__q {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 12px;
  align-items: start;
  padding: clamp(16px, 2.4vw, 22px) 4px;
  cursor: pointer;
  list-style: none;
  color: var(--paper);
  font-size: 16.5px;
  line-height: 1.55;
  transition: color 0.2s var(--ease);
}

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

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

.page-faq .faq-item__q:hover {
  color: var(--pulse);
}

.page-faq .faq-item__q:focus-visible {
  outline: 1px solid var(--pulse);
  outline-offset: 3px;
}

.page-faq .faq-item__num {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--dim);
  padding-top: 6px;
}

.page-faq .faq-item__text {
  display: block;
}

.page-faq .faq-item__mark {
  position: relative;
  width: 14px;
  height: 14px;
  margin-top: 6px;
  flex: none;
  transition: transform 0.24s var(--ease);
}

.page-faq .faq-item__mark::before,
.page-faq .faq-item__mark::after {
  content: "";
  position: absolute;
  background: var(--pulse);
  transition: background-color 0.24s var(--ease);
}

.page-faq .faq-item__mark::before {
  left: 0;
  top: 6px;
  width: 14px;
  height: 1.5px;
}

.page-faq .faq-item__mark::after {
  left: 6.25px;
  top: 0;
  width: 1.5px;
  height: 14px;
}

.page-faq .faq-item[open] .faq-item__q {
  color: var(--pulse);
}

.page-faq .faq-item[open] .faq-item__mark {
  transform: rotate(45deg);
}

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

.page-faq .faq-item__a {
  margin: 0 0 22px 22px;
  padding: 2px 0 0 18px;
  border-left: 1px solid rgba(59, 231, 210, 0.42);
}

.page-faq .faq-item__a p {
  margin: 0 0 10px;
  color: var(--soft);
  font-size: 15.5px;
  line-height: 1.74;
  max-width: 62ch;
}

.page-faq .faq-item__a p:last-of-type {
  margin-bottom: 12px;
}

.page-faq .faq-mail {
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.04em;
  color: var(--pulse);
}

/* ---------- 答案里的链接 ---------- */
.page-faq .faq-item__link {
  display: inline-flex;
  align-items: baseline;
  gap: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--pulse);
  text-decoration: none;
  border-bottom: 1px solid rgba(59, 231, 210, 0.34);
  padding-bottom: 1px;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-faq .faq-item__go {
  display: inline-block;
  max-width: 0;
  overflow: hidden;
  white-space: nowrap;
  opacity: 0;
  font-size: 12px;
  color: var(--flare);
  transition: max-width 0.28s var(--ease), opacity 0.24s var(--ease), margin-left 0.28s var(--ease);
}

.page-faq .faq-item__link:hover,
.page-faq .faq-item__link:focus-visible {
  color: var(--flare);
  border-color: var(--flare);
}

.page-faq .faq-item__link:hover .faq-item__go,
.page-faq .faq-item__link:focus-visible .faq-item__go {
  max-width: 12em;
  opacity: 1;
  margin-left: 8px;
}

/* ---------- 版本号面板 ---------- */
.page-faq .faq-version {
  position: relative;
  background: var(--ink-800);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding-top: clamp(40px, 6vw, 76px);
  padding-bottom: clamp(40px, 6vw, 76px);
}

.page-faq .faq-version::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 1px;
  background: linear-gradient(to right, transparent, var(--pulse), transparent);
  opacity: 0.55;
}

.page-faq .faq-version__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 48px);
  align-items: center;
}

.page-faq .faq-version__title {
  margin: 12px 0 0;
  font-size: clamp(22px, 3.2vw, 34px);
  line-height: 1.24;
  letter-spacing: 0.04em;
  font-weight: 300;
  color: var(--paper);
}

.page-faq .faq-version__code {
  margin: clamp(16px, 2.4vw, 22px) 0 clamp(20px, 3vw, 28px);
  font-family: var(--font-mono);
  font-size: clamp(20px, 3.6vw, 34px);
  letter-spacing: 0.1em;
  font-variant-numeric: tabular-nums;
  color: var(--pulse);
  padding: 12px 0 12px 16px;
  border-left: 2px solid var(--flare);
  background: rgba(7, 20, 38, 0.6);
}

.page-faq .faq-list--panel {
  border-top: none;
}

.page-faq .faq-item--panel {
  border-bottom-color: var(--line-strong);
}

.page-faq .faq-item--panel .faq-item__a {
  border-left-color: rgba(255, 122, 47, 0.5);
}

.page-faq .faq-version__fig {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--ink-900);
}

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

.page-faq .faq-version__figcap {
  display: block;
  padding: 10px 14px;
  border-top: 1px solid var(--line);
  font-size: 12px;
  color: var(--dim);
  letter-spacing: 0.06em;
}

.page-faq .faq-version__figcap .yb-mono {
  color: var(--flare);
  margin-right: 8px;
  font-size: 11px;
}

/* ---------- 页尾轻收束 ---------- */
.page-faq .faq-tail {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-top: clamp(24px, 3.4vw, 34px);
  border-top: 1px solid var(--line-strong);
}

.page-faq .faq-tail__text {
  margin: 0;
  color: var(--softer);
  font-size: 14.5px;
  line-height: 1.7;
  max-width: 40ch;
}

.page-faq .faq-tail .yb-btn {
  text-decoration: none;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-faq .faq-group__head {
    gap: 22px;
  }

  .page-faq .faq-item__q {
    gap: 18px;
    font-size: 17px;
  }

  .page-faq .faq-item__a {
    margin-left: 30px;
    padding-left: 22px;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(32px, 4vw, 56px);
  }

  .page-faq .faq-version__inner {
    grid-template-columns: minmax(0, 6fr) minmax(0, 4fr);
  }

  .page-faq .faq-version__fig {
    align-self: stretch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item__mark,
  .page-faq .faq-item__q,
  .page-faq .faq-item__link,
  .page-faq .faq-item__go,
  .page-faq .faq-jump__link {
    transition: none;
  }
}