.page-faq {
  background: var(--yt-ink-900);
  color: var(--yt-paper-50);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding: calc(var(--yt-header-h) + 24px) 0 clamp(40px, 6vw, 72px);
  background:
    radial-gradient(90% 70% at 88% 6%, rgba(18, 112, 79, .55), transparent 62%),
    radial-gradient(70% 60% at 0% 100%, rgba(44, 90, 124, .32), transparent 66%),
    var(--yt-ink-900);
  border-bottom: 1px solid var(--yt-line);
}

.page-faq .faq-hero__inner {
  display: grid;
  gap: 28px;
}

.page-faq .faq-hero .yt-crumbs {
  margin-bottom: 20px;
}

.page-faq .faq-hero .yt-crumbs__link {
  color: var(--yt-steel-200);
}

.page-faq .faq-hero .yt-crumbs__link:hover,
.page-faq .faq-hero .yt-crumbs__link:focus-visible {
  color: var(--yt-orange-500);
}

.page-faq .faq-hero__title {
  font-size: clamp(30px, 5.2vw, 58px);
  line-height: 1.14;
  letter-spacing: -0.02em;
  margin: 12px 0 0;
  max-width: 17ch;
}

.page-faq .faq-hero__lead {
  margin: 18px 0 0;
  max-width: 52ch;
  color: var(--yt-steel-200);
}

.page-faq .faq-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-faq .faq-hero__figure {
  aspect-ratio: 12 / 7;
}

@media (min-width: 960px) {
  .page-faq .faq-hero__inner {
    grid-template-columns: 7fr 5fr;
    gap: 48px;
    align-items: center;
  }
}

/* ---------- 图片容器 ---------- */
.page-faq .faq-figure {
  margin: 0;
  display: block;
  overflow: hidden;
  background: var(--yt-ink-700);
  border: 1px solid var(--yt-line);
  clip-path: var(--yt-cut);
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(.82) contrast(1.05);
}

/* ---------- 分类跳转 ---------- */
.page-faq .faq-jump {
  background: var(--yt-ink-700);
  border-bottom: 1px solid var(--yt-line);
}

.page-faq .faq-jump__inner {
  display: flex;
  align-items: center;
  gap: 14px;
  padding-top: 14px;
  padding-bottom: 14px;
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-faq .faq-jump__label {
  flex: 0 0 auto;
  font-family: var(--yt-font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--yt-orange-500);
}

.page-faq .faq-jump__list {
  display: flex;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-faq .faq-jump__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  white-space: nowrap;
  font-size: 14px;
  color: var(--yt-paper-50);
  text-decoration: none;
  border: 1px solid var(--yt-line);
  clip-path: var(--yt-cut-sm);
  transition: background-color .2s ease, color .2s ease, border-color .2s ease;
}

.page-faq .faq-jump__link:hover,
.page-faq .faq-jump__link:focus-visible {
  background: var(--yt-orange-500);
  border-color: var(--yt-orange-500);
  color: var(--yt-ink-900);
}

.page-faq .faq-jump__num {
  font-family: var(--yt-font-mono);
  font-size: 12px;
  color: var(--yt-lime-400);
  transition: color .2s ease;
}

.page-faq .faq-jump__link:hover .faq-jump__num,
.page-faq .faq-jump__link:focus-visible .faq-jump__num {
  color: var(--yt-ink-900);
}

/* ---------- 问答分组 ---------- */
.page-faq .faq-group {
  padding: clamp(36px, 5.5vw, 68px) 0;
  border-bottom: 1px solid var(--yt-line-soft);
  scroll-margin-top: calc(var(--yt-header-h-compact) + 20px);
}

.page-faq .faq-group__head {
  display: grid;
  gap: 8px;
  margin-bottom: clamp(20px, 3vw, 34px);
  max-width: 62ch;
}

.page-faq .faq-group__num {
  position: relative;
  padding-left: 20px;
  font-family: var(--yt-font-mono);
  font-size: 13px;
  letter-spacing: .16em;
  color: var(--yt-orange-500);
}

.page-faq .faq-group__num::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 12px;
  height: 2px;
  background: var(--yt-orange-500);
  transform: translateY(-50%);
}

.page-faq .faq-group__title {
  margin: 0;
  font-size: clamp(24px, 3.2vw, 36px);
  color: var(--yt-paper-50);
}

.page-faq .faq-group__note {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--yt-steel-200);
  max-width: 58ch;
}

.page-faq .faq-group__list {
  border-top: 1px solid var(--yt-line);
}

.page-faq .faq-group__split {
  display: grid;
  gap: 24px;
}

.page-faq .faq-group__figure {
  aspect-ratio: 4 / 3;
}

@media (min-width: 900px) {
  .page-faq .faq-group__split {
    grid-template-columns: 5fr 7fr;
    gap: 40px;
    align-items: start;
  }
}

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

.page-faq .faq-item__summary {
  display: grid;
  grid-template-columns: 34px 1fr 26px;
  align-items: start;
  gap: 12px;
  padding: 18px 2px;
  cursor: pointer;
  list-style: none;
  transition: color .2s ease;
}

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

.page-faq .faq-item__summary:hover .faq-item__q,
.page-faq .faq-item__summary:focus-visible .faq-item__q {
  color: var(--yt-orange-300);
}

.page-faq .faq-item__idx {
  padding-top: 3px;
  font-family: var(--yt-font-mono);
  font-size: 13px;
  letter-spacing: .06em;
  line-height: 1.6;
  color: var(--yt-lime-400);
}

.page-faq .faq-item__q {
  font-family: var(--yt-font-head);
  font-weight: 700;
  font-size: clamp(16px, 2vw, 19px);
  line-height: 1.55;
  color: var(--yt-paper-50);
  transition: color .2s ease;
}

.page-faq .faq-item__sign {
  position: relative;
  width: 22px;
  height: 22px;
  margin-top: 3px;
  border: 1px solid var(--yt-line);
  clip-path: var(--yt-cut-sm);
}

.page-faq .faq-item__sign::before,
.page-faq .faq-item__sign::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 10px;
  height: 2px;
  background: var(--yt-orange-500);
  transform: translate(-50%, -50%);
  transition: transform .25s ease, opacity .25s ease;
}

.page-faq .faq-item__sign::after {
  transform: translate(-50%, -50%) rotate(90deg);
}

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

.page-faq .faq-item[open] .faq-item__summary {
  padding-bottom: 12px;
}

/* ---------- 答案面板 ---------- */
.page-faq .faq-item__body {
  margin: 0 0 20px;
  padding: 20px 22px 24px;
  background: var(--yt-paper-50);
  color: var(--yt-text-900);
  font-size: 16px;
  line-height: 1.78;
  clip-path: var(--yt-cut);
  max-width: 82ch;
}

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

.page-faq .faq-item__body a {
  color: var(--yt-pitch-500);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-faq .faq-points {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-faq .faq-points li {
  position: relative;
  padding-left: 18px;
  line-height: 1.7;
}

.page-faq .faq-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .72em;
  width: 9px;
  height: 2px;
  background: var(--yt-orange-500);
}

.page-faq .faq-diagram {
  margin: 18px 0 0;
}

.page-faq .faq-diagram svg {
  display: block;
  width: 100%;
  max-width: 340px;
  height: auto;
}

/* ---------- 收尾 ---------- */
.page-faq .faq-outro {
  padding: clamp(40px, 6vw, 76px) 0 clamp(48px, 7vw, 88px);
  background: var(--yt-ink-700);
  border-top: 1px solid var(--yt-line);
}

.page-faq .faq-outro__inner {
  display: grid;
  gap: 24px;
}

.page-faq .faq-outro__title {
  margin: 10px 0 0;
  font-size: clamp(22px, 3vw, 32px);
  color: var(--yt-paper-50);
}

.page-faq .faq-outro__text {
  margin: 14px 0 0;
  max-width: 58ch;
  line-height: 1.75;
  color: var(--yt-steel-200);
}

.page-faq .faq-outro__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

@media (min-width: 860px) {
  .page-faq .faq-outro__inner {
    grid-template-columns: 1fr auto;
    align-items: center;
    gap: 48px;
  }
}

/* ---------- 窄屏 ---------- */
@media (max-width: 620px) {
  .page-faq .faq-hero__title {
    max-width: none;
  }

  .page-faq .faq-item__summary {
    grid-template-columns: 28px 1fr 22px;
    gap: 10px;
    padding: 16px 0;
  }

  .page-faq .faq-item__body {
    padding: 16px 16px 20px;
  }

  .page-faq .faq-hero__actions .yt-btn,
  .page-faq .faq-outro__actions .yt-btn {
    flex: 1 1 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item__sign::before,
  .page-faq .faq-item__sign::after,
  .page-faq .faq-jump__link,
  .page-faq .faq-jump__num,
  .page-faq .faq-item__q {
    transition: none;
  }
}