.page-faq {
  --faq-pad: 16px;
  --faq-qa-line: rgba(159, 182, 198, .14);
  padding-bottom: 88px;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  display: grid;
  gap: 34px;
  padding: 26px 0 52px;
}

.page-faq .faq-hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 16px;
  font-size: 12px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-faq .faq-hero__eyebrow::before {
  content: "";
  width: 26px;
  height: 1px;
  background: var(--cyan);
}

.page-faq .faq-hero h1 {
  margin: 0 0 18px;
  font-size: clamp(29px, 7.2vw, 54px);
  line-height: 1.1;
  font-weight: 800;
  letter-spacing: -.02em;
  color: var(--fog);
}

.page-faq .faq-hero .lede {
  margin: 0 0 26px;
  max-width: 34em;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--mute);
}

.page-faq .faq-hero .lede a {
  color: var(--cyan-soft);
  text-decoration: none;
  border-bottom: 1px solid var(--line-strong);
}

.page-faq .faq-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 28px;
  padding-top: 20px;
  border-top: 1px solid var(--faq-qa-line);
}

.page-faq .faq-hero__fact {
  display: flex;
  align-items: baseline;
  gap: 8px;
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--mute);
}

.page-faq .faq-hero__fact b {
  font-family: var(--font-mono);
  font-size: 19px;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  color: var(--cyan);
}

.page-faq .faq-hero__figure {
  position: relative;
  margin: 0;
}

.page-faq .faq-hero__figure::before {
  content: "";
  position: absolute;
  top: -12px;
  right: -12px;
  width: 74%;
  height: 100%;
  border-radius: var(--radius);
  background: linear-gradient(150deg, rgba(34, 211, 238, .22), rgba(108, 108, 229, .06) 68%, transparent);
  clip-path: polygon(16% 0, 100% 0, 100% 100%, 0 100%);
}

.page-faq .faq-hero__figure img {
  position: relative;
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  object-fit: cover;
}

/* ---------- 两栏骨架 ---------- */
.page-faq .faq-layout {
  display: grid;
  gap: 34px;
  align-items: start;
}

.page-faq .faq-toc {
  border-top: 1px solid var(--line);
  padding: 16px 0 0;
}

.page-faq .faq-toc__title {
  margin: 0 0 12px;
  font-size: 11.5px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--mute);
}

.page-faq .faq-toc__list {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 4px;
  margin: 0;
  padding: 0;
}

.page-faq .faq-toc__list a {
  display: flex;
  gap: 9px;
  padding: 8px 8px 8px 0;
  font-size: 13.5px;
  line-height: 1.5;
  color: var(--fog);
  text-decoration: none;
  border-radius: var(--radius-sm);
  transition: color .22s var(--ease), transform .22s var(--ease);
}

.page-faq .faq-toc__list a:hover {
  color: var(--cyan);
  transform: translateX(3px);
}

.page-faq .faq-toc__no {
  flex: none;
  padding-top: 2px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-variant-numeric: tabular-nums;
  color: var(--cyan);
}

/* ---------- 分组 ---------- */
.page-faq .faq-group {
  scroll-margin-top: calc(var(--topbar-h) + 24px);
  padding-bottom: 46px;
}

.page-faq .faq-group + .faq-group {
  padding-top: 46px;
  border-top: 1px solid var(--line);
}

.page-faq .faq-group--last {
  padding-bottom: 12px;
}

.page-faq .faq-group__head {
  display: grid;
  gap: 10px;
  margin-bottom: 20px;
}

.page-faq .faq-group__no {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .18em;
  color: var(--cyan);
}

.page-faq .faq-group h2 {
  margin: 0;
  font-size: clamp(21px, 4.6vw, 30px);
  line-height: 1.22;
  font-weight: 800;
  letter-spacing: -.015em;
  color: var(--fog);
}

.page-faq .faq-group__desc {
  margin: 0;
  max-width: 34em;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--mute);
}

/* ---------- 问答条目 ---------- */
.page-faq .qa {
  border-top: 1px solid var(--faq-qa-line);
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  background: transparent;
  transition: background .26s var(--ease);
}

.page-faq .qa[open] {
  background: linear-gradient(100deg, rgba(34, 211, 238, .09), rgba(14, 44, 68, .55) 62%, transparent);
}

.page-faq .qa > summary {
  position: relative;
  display: flex;
  gap: 14px;
  align-items: flex-start;
  padding: 18px 44px 18px 14px;
  list-style: none;
  cursor: pointer;
  color: var(--fog);
  font-size: 15.5px;
  font-weight: 600;
  line-height: 1.6;
  transition: color .2s var(--ease);
}

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

.page-faq .qa > summary::marker {
  content: "";
}

.page-faq .qa > summary:hover {
  color: var(--cyan);
}

.page-faq .qa__no {
  flex: none;
  min-width: 26px;
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-variant-numeric: tabular-nums;
  color: var(--mute);
  transition: color .2s var(--ease);
}

.page-faq .qa[open] .qa__no {
  color: var(--cyan);
}

.page-faq .qa > summary::after {
  content: "";
  position: absolute;
  top: 23px;
  right: 16px;
  width: 9px;
  height: 9px;
  border-right: 2px solid var(--cyan-soft);
  border-bottom: 2px solid var(--cyan-soft);
  transform: rotate(45deg);
  transition: transform .26s var(--ease), top .26s var(--ease);
}

.page-faq .qa[open] > summary::after {
  top: 27px;
  transform: rotate(-135deg);
}

.page-faq .qa__body {
  display: grid;
  gap: 12px;
  padding: 0 22px 20px 54px;
  animation: faq-drop .3s var(--ease) both;
}

@keyframes faq-drop {
  from {
    opacity: 0;
    transform: translateY(-6px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.page-faq .qa__body p {
  margin: 0;
  max-width: 34em;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mute);
}

.page-faq .qa__body p a {
  color: var(--cyan-soft);
  text-decoration: none;
  border-bottom: 1px solid var(--line-strong);
}

.page-faq .qa__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-top: 10px;
  border-top: 1px solid var(--faq-qa-line);
}

/* ---------- 章节配图 ---------- */
.page-faq .faq-figure {
  margin: 0 0 8px;
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  object-fit: cover;
}

.page-faq .faq-figure .figure__cap {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--mute);
}

/* ---------- 联络渠道 ---------- */
.page-faq .faq-channels {
  display: grid;
  gap: 14px;
}

.page-faq .faq-channel {
  padding: 20px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--deep-2);
  transition: transform .26s var(--ease), border-color .26s var(--ease);
}

.page-faq .faq-channel:hover {
  transform: translateY(-4px);
  border-color: var(--line-strong);
}

.page-faq .faq-channel--accent {
  border-color: var(--line-strong);
  background: linear-gradient(140deg, rgba(34, 211, 238, .14), rgba(14, 44, 68, .9));
}

.page-faq .faq-channel__label {
  margin: 0 0 10px;
  font-size: 11.5px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-faq .faq-channel__value {
  margin: 0 0 10px;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.6;
  color: var(--fog);
  word-break: break-word;
}

.page-faq .faq-channel .mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: -.01em;
}

.page-faq .faq-channel__desc {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--mute);
}

.page-faq .faq-note {
  margin: 22px 0 0;
  padding-top: 18px;
  border-top: 1px solid var(--faq-qa-line);
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--mute);
}

.page-faq .faq-note a {
  color: var(--cyan-soft);
  text-decoration: none;
  border-bottom: 1px solid var(--line-strong);
}

/* ---------- 响应式 ---------- */
@media (max-width: 599px) {
  .page-faq .qa > summary {
    padding: 16px 40px 16px 6px;
    font-size: 15px;
  }

  .page-faq .qa__no {
    min-width: 22px;
  }

  .page-faq .qa__body {
    padding: 0 16px 18px 46px;
  }

  .page-faq .faq-hero__figure::before {
    top: -8px;
    right: -8px;
  }
}

@media (min-width: 760px) {
  .page-faq .faq-channels {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-faq .faq-channel--accent {
    grid-column: 1 / -1;
  }

  .page-faq .faq-hero {
    padding: 34px 0 62px;
  }
}

@media (min-width: 1000px) {
  .page-faq .faq-hero {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, .94fr);
    align-items: center;
    gap: 52px;
    padding: 44px 0 76px;
  }

  .page-faq .faq-layout {
    grid-template-columns: 232px minmax(0, 1fr);
    gap: 68px;
  }

  .page-faq .faq-toc {
    position: sticky;
    top: calc(var(--topbar-h) + 22px);
    border-top: none;
    border-left: 2px solid var(--line-strong);
    padding: 0 0 0 18px;
  }

  .page-faq .faq-toc__list {
    grid-template-columns: 1fr;
  }

  .page-faq .faq-group {
    padding-bottom: 54px;
  }

  .page-faq .faq-group + .faq-group {
    padding-top: 54px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa__body {
    animation: none;
  }

  .page-faq .qa > summary,
  .page-faq .qa > summary::after,
  .page-faq .faq-channel,
  .page-faq .faq-toc__list a {
    transition: none;
  }
}