.page-faq {
  --faq-block-gap: clamp(20px, 3vw, 36px);
  --faq-radius: 4px;
  background: var(--c-deep);
  color: var(--c-mist);
  padding-block: clamp(24px, 3.6vw, 48px) clamp(56px, 8vw, 104px);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-intro {
  position: relative;
  margin-top: 18px;
  padding-block: clamp(20px, 3.4vw, 44px) clamp(24px, 3.6vw, 44px);
  border-bottom: 1px solid var(--c-line);
  overflow: hidden;
}

.page-faq .faq-intro::after {
  content: "";
  position: absolute;
  right: -60px;
  top: -40px;
  width: 340px;
  height: 340px;
  background: repeating-linear-gradient(
    -45deg,
    rgba(53, 240, 192, .09) 0 1px,
    transparent 1px 14px
  );
  pointer-events: none;
  opacity: .7;
}

.page-faq .faq-intro h1 {
  position: relative;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(29px, 5.4vw, 58px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  margin: 12px 0 0;
  max-width: 20ch;
}

.page-faq .faq-intro__lede {
  position: relative;
  margin: 18px 0 0;
  max-width: 64ch;
  font-size: clamp(15px, 1.55vw, 18px);
  line-height: 1.78;
  color: var(--c-steel);
}

.page-faq .faq-intro__keys {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 30px;
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--c-steel);
}

.page-faq .faq-intro__keys li {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding-bottom: 3px;
  border-bottom: 1px solid var(--c-line);
}

.page-faq .faq-intro__keys .num {
  font-size: 16px;
  color: var(--c-neon);
}

/* ---------- 两栏布局 ---------- */
.page-faq .faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--faq-block-gap);
  margin-top: clamp(26px, 3.6vw, 46px);
}

/* ---------- 目录 ---------- */
.page-faq .faq-toc {
  order: -1;
  min-width: 0;
}

.page-faq .faq-toc__title {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--c-steel);
  margin: 0 0 10px;
}

.page-faq .faq-toc__list {
  display: flex;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.page-faq .faq-toc__list li {
  flex: 0 0 auto;
}

.page-faq .faq-toc__list a {
  display: block;
  white-space: nowrap;
  padding: 8px 15px;
  font-size: 13px;
  color: var(--c-steel);
  text-decoration: none;
  border: 1px solid var(--c-line);
  border-radius: 999px;
  transition: color .18s var(--ease), border-color .18s var(--ease), background-color .18s var(--ease);
}

.page-faq .faq-toc__list a:hover,
.page-faq .faq-toc__list a:focus-visible {
  color: var(--c-mist);
  border-color: var(--c-lava);
  background: rgba(255, 90, 31, .12);
}

/* ---------- 分组 ---------- */
.page-faq .faq-group {
  padding-block: clamp(26px, 3.4vw, 42px);
  border-top: 1px solid var(--c-line);
  scroll-margin-top: calc(var(--bar-h) + 24px);
}

.page-faq .faq-group:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-faq .faq-group__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  margin-bottom: 20px;
}

.page-faq .faq-group__num {
  display: block;
  padding-top: 5px;
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--c-lava);
}

.page-faq .faq-group h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(21px, 2.9vw, 31px);
  line-height: 1.22;
  letter-spacing: -0.01em;
  margin: 0;
  color: var(--c-mist);
}

.page-faq .faq-group__scene {
  margin: 9px 0 0;
  max-width: 58ch;
  font-size: 14px;
  line-height: 1.72;
  color: var(--c-steel);
}

/* ---------- 配图 ---------- */
.page-faq .faq-figure {
  margin: 0 0 20px;
  border: 1px solid var(--c-line);
  border-radius: var(--faq-radius);
  background: var(--c-midnight);
  overflow: hidden;
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.85) contrast(1.04);
}

.page-faq .faq-figure figcaption {
  padding: 11px 15px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--c-steel);
  border-top: 1px solid var(--c-line);
}

/* ---------- 手风琴 ---------- */
.page-faq .faq-list {
  display: grid;
  gap: 3px;
}

.page-faq .faq-item {
  border-left: 2px solid transparent;
  border-radius: 0 var(--faq-radius) var(--faq-radius) 0;
  background: rgba(20, 49, 92, .34);
  transition: border-color .18s var(--ease), background-color .18s var(--ease);
}

.page-faq .faq-item[open] {
  border-left-color: var(--c-lava);
  background: rgba(20, 49, 92, .72);
}

.page-faq .faq-item summary {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 16px;
  align-items: center;
  gap: 14px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--c-mist);
}

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

.page-faq .faq-item summary:hover {
  color: var(--c-lava-soft);
}

.page-faq .faq-item summary:focus-visible {
  outline: 2px solid var(--c-lava);
  outline-offset: -2px;
}

.page-faq .faq-item__mark {
  position: relative;
  width: 14px;
  height: 14px;
  justify-self: end;
}

.page-faq .faq-item__mark::before,
.page-faq .faq-item__mark::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  background: var(--c-lava);
  transform: translate(-50%, -50%);
  transition: transform .2s var(--ease), opacity .2s var(--ease);
}

.page-faq .faq-item__mark::before {
  width: 14px;
  height: 2px;
}

.page-faq .faq-item__mark::after {
  width: 2px;
  height: 14px;
}

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

.page-faq .faq-item__a {
  padding: 0 16px 18px;
  max-width: 70ch;
  font-size: 14px;
  line-height: 1.78;
  color: var(--c-steel);
}

.page-faq .faq-item__a p {
  margin: 0 0 10px;
}

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

.page-faq .faq-item__a a {
  color: var(--c-neon);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 240, 192, .4);
}

.page-faq .faq-item__a a:hover,
.page-faq .faq-item__a a:focus-visible {
  border-bottom-color: var(--c-neon);
}

.page-faq .faq-steps {
  list-style: none;
  counter-reset: faqstep;
  margin: 12px 0 0;
  padding: 0;
  display: grid;
  gap: 9px;
}

.page-faq .faq-steps li {
  counter-increment: faqstep;
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr);
  gap: 10px;
  font-size: 13.5px;
  line-height: 1.7;
}

.page-faq .faq-steps li::before {
  content: counter(faqstep, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--c-lava-soft);
  padding-top: 3px;
}

/* ---------- 指标示意 ---------- */
.page-faq .faq-metrics {
  margin: 0 0 20px;
  padding: 18px 16px;
  border: 1px solid var(--c-line);
  border-left: 2px solid var(--c-neon);
  border-radius: var(--faq-radius);
  background:
    repeating-linear-gradient(
      90deg,
      rgba(255, 255, 255, .035) 0 1px,
      transparent 1px 42px
    ),
    var(--c-midnight);
}

.page-faq .faq-metrics__title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--c-neon);
}

.page-faq .faq-metrics__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-faq .faq-metrics__list li {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 4px 14px;
  align-items: baseline;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--c-line);
}

.page-faq .faq-metrics__list li:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-faq .faq-metrics__key {
  font-size: 14.5px;
  font-weight: 600;
  color: var(--c-mist);
}

.page-faq .faq-metrics__val {
  font-size: 15px;
  color: var(--c-neon);
  white-space: nowrap;
}

.page-faq .faq-metrics__desc {
  grid-column: 1 / -1;
  font-size: 13px;
  line-height: 1.65;
  color: var(--c-steel);
}

/* ---------- 联系分组 ---------- */
.page-faq .faq-group--contact {
  border-top-color: var(--c-lava);
}

.page-faq .faq-contact {
  display: grid;
  gap: 1px;
  border: 1px solid var(--c-line);
  border-radius: var(--faq-radius);
  overflow: hidden;
  background: var(--c-line);
}

.page-faq .faq-contact__row {
  display: grid;
  gap: 4px;
  padding: 14px 16px;
  background: var(--c-midnight);
}

.page-faq .faq-contact__key {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .1em;
  color: var(--c-steel);
}

.page-faq .faq-contact__value {
  font-size: 15px;
  line-height: 1.6;
  color: var(--c-mist);
  word-break: break-word;
}

.page-faq .faq-contact__value.num {
  color: var(--c-lava-soft);
}

.page-faq .faq-contact__note {
  margin: 16px 0 0;
  max-width: 62ch;
  font-size: 13.5px;
  line-height: 1.74;
  color: var(--c-steel);
}

.page-faq .faq-contact__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

/* ---------- 平板 ---------- */
@media (min-width: 700px) {
  .page-faq .faq-contact__row {
    grid-template-columns: 120px minmax(0, 1fr);
    align-items: baseline;
    gap: 16px;
  }

  .page-faq .faq-metrics {
    padding: 22px 22px;
  }

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

  .page-faq .faq-metrics__list li {
    grid-template-columns: minmax(0, 1fr);
    padding: 0 18px;
    border-bottom: 0;
    border-left: 1px solid var(--c-line);
  }

  .page-faq .faq-metrics__list li:first-child {
    padding-left: 0;
    border-left: 0;
  }

  .page-faq .faq-metrics__list li:last-child {
    padding-right: 0;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 1024px) {
  .page-faq .faq-layout {
    grid-template-columns: minmax(0, 1fr) 236px;
    gap: clamp(36px, 4.4vw, 68px);
  }

  .page-faq .faq-main {
    grid-column: 1;
    grid-row: 1;
    min-width: 0;
  }

  .page-faq .faq-toc {
    order: 0;
    grid-column: 2;
    grid-row: 1;
    position: sticky;
    top: calc(var(--bar-h) + 34px);
    align-self: start;
  }

  .page-faq .faq-toc__title {
    padding-bottom: 12px;
    border-bottom: 1px solid var(--c-line);
  }

  .page-faq .faq-toc__list {
    display: block;
    overflow: visible;
    padding: 0;
  }

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

  .page-faq .faq-toc__list a {
    white-space: normal;
    padding: 8px 0 8px 15px;
    border: 0;
    border-left: 2px solid var(--c-line);
    border-radius: 0;
    background: none;
    font-size: 13.5px;
    transition: border-color .18s var(--ease), color .18s var(--ease), padding-left .18s var(--ease);
  }

  .page-faq .faq-toc__list a:hover,
  .page-faq .faq-toc__list a:focus-visible {
    border-left-color: var(--c-lava);
    background: none;
    color: var(--c-mist);
    padding-left: 19px;
  }

  .page-faq .faq-group {
    padding-block: clamp(32px, 3.4vw, 52px);
  }

  .page-faq .faq-group__head {
    grid-template-columns: 48px minmax(0, 1fr);
    gap: 18px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item__mark::before,
  .page-faq .faq-item__mark::after,
  .page-faq .faq-toc__list a,
  .page-faq .faq-item {
    transition: none;
  }
}