.page-faq {
  --faq-line: rgba(42, 51, 49, .14);
  --faq-mute: #566E68;
  --faq-line-dark: rgba(199, 207, 204, .18);
}

/* 面包屑与首屏 */
.page-faq .crumbs {
  padding: 20px 0 0;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--silver-dim);
}

.page-faq .crumbs a {
  color: var(--silver-dim);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}

.page-faq .crumbs a:hover {
  color: var(--cyan);
}

.page-faq .crumbs__sep {
  margin: 0 8px;
  color: var(--silver-dim);
}

.page-faq .faq-hero {
  padding: 44px 0 52px;
}

.page-faq .faq-hero__coord {
  margin: 0 0 20px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--cyan);
}

.page-faq .faq-hero__title {
  margin: 0;
  max-width: 15ch;
  font-family: var(--font-title);
  font-weight: 900;
  font-size: clamp(32px, 7vw, 68px);
  line-height: 1.08;
  letter-spacing: -.02em;
  color: var(--mist);
}

.page-faq .faq-hero__lead {
  margin: 26px 0 0;
  max-width: 62ch;
  font-size: 17px;
  line-height: 1.78;
  color: var(--silver);
}

/* 三步上手 */
.page-faq .faq-steps {
  padding: 0 0 68px;
}

.page-faq .faq-steps__title {
  margin: 0 0 26px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 400;
  letter-spacing: .16em;
  color: var(--silver-dim);
}

.page-faq .faq-steps__grid {
  display: grid;
  gap: 32px;
}

.page-faq .steps {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .step {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 16px;
  padding: 22px 0;
  border-top: 1px solid var(--faq-line-dark);
  transition: border-color var(--dur) var(--ease);
}

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

.page-faq .step:hover {
  border-top-color: var(--cyan);
}

.page-faq .step__num {
  font-family: var(--font-mono);
  font-size: 21px;
  line-height: 1.25;
  letter-spacing: .04em;
  color: var(--cyan);
}

.page-faq .step__title {
  margin: 0 0 8px;
  font-family: var(--font-title);
  font-size: 21px;
  font-weight: 800;
  line-height: 1.35;
  letter-spacing: -.01em;
  color: var(--mist);
}

.page-faq .step__text {
  margin: 0;
  font-size: 17px;
  line-height: 1.78;
  color: var(--silver);
}

.page-faq .faq-steps__fig {
  margin: 0;
}

.page-faq .faq-steps__fig img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  filter: saturate(.55) contrast(1.05);
  clip-path: polygon(0 0, calc(100% - 32px) 0, 100% 32px, 100% 100%, 0 100%);
}

.page-faq .faq-steps__fig figcaption {
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.7;
  letter-spacing: .04em;
  color: var(--silver-dim);
}

/* 问答区开头 */
.page-faq .faq-open {
  display: grid;
  gap: 28px;
  padding: 60px 0 8px;
}

.page-faq .faq-open__title {
  margin: 0 0 14px;
  font-family: var(--font-title);
  font-size: clamp(26px, 3.6vw, 40px);
  font-weight: 900;
  letter-spacing: -.02em;
  color: var(--graphite);
}

.page-faq .faq-open__lead {
  margin: 0 0 20px;
  max-width: 56ch;
  font-size: 17px;
  line-height: 1.78;
  color: var(--faq-mute);
}

.page-faq .faq-open__jump {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-open__jump a {
  display: inline-block;
  padding-bottom: 3px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--ink-mid);
  text-decoration: none;
  border-bottom: 1px solid var(--ink-mid);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-faq .faq-open__jump a:hover {
  color: var(--amber-deep);
  border-bottom-color: var(--amber-deep);
}

.page-faq .faq-open__fig {
  margin: 0;
}

.page-faq .faq-open__fig img {
  display: block;
  width: 100%;
  max-width: 240px;
  height: auto;
  filter: saturate(.4);
}

/* 问答双栏 */
.page-faq .faq-grid {
  display: grid;
  gap: 36px;
  padding: 40px 0 76px;
}

.page-faq .faq-index__label {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--faq-mute);
}

.page-faq .faq-index__list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 20px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-index__link {
  display: block;
  padding: 8px 0;
  font-size: 15px;
  letter-spacing: .02em;
  color: var(--graphite);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-faq .faq-index__link:hover {
  color: var(--ink-mid);
  border-bottom-color: var(--cyan);
}

.page-faq .faq-index__link span {
  margin-left: 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--faq-mute);
}

.page-faq .faq-group + .faq-group {
  margin-top: 60px;
}

.page-faq .faq-group__head {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  padding-bottom: 18px;
}

.page-faq .faq-group__code {
  font-family: var(--font-mono);
  font-size: 21px;
  letter-spacing: .06em;
  color: var(--ink-mid);
}

.page-faq .faq-group__title {
  margin: 0 0 8px;
  font-family: var(--font-title);
  font-size: clamp(22px, 3vw, 28px);
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--graphite);
}

.page-faq .faq-group__note {
  margin: 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.7;
  color: var(--faq-mute);
}

/* 折叠问答 */
.page-faq .qa-list {
  border-top: 1px solid var(--faq-line);
}

.page-faq .qa {
  position: relative;
  border-bottom: 1px solid var(--faq-line);
}

.page-faq .qa::before {
  content: "";
  position: absolute;
  left: 0;
  top: 18px;
  bottom: 18px;
  width: 2px;
  background: var(--cyan);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform var(--dur) var(--ease);
}

.page-faq .qa:hover::before,
.page-faq .qa[open]::before {
  transform: scaleY(1);
}

.page-faq .qa__summary {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr) 14px;
  gap: 12px;
  align-items: start;
  padding: 18px 6px 18px 16px;
  cursor: pointer;
  list-style: none;
}

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

.page-faq .qa__num {
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--faq-mute);
}

.page-faq .qa__q {
  font-size: 17px;
  font-weight: 700;
  line-height: 1.6;
  color: var(--graphite);
  transition: color var(--dur) var(--ease);
}

.page-faq .qa:hover .qa__q {
  color: var(--ink-mid);
}

.page-faq .qa__mark {
  width: 9px;
  height: 9px;
  margin-top: 8px;
  border-right: 1.5px solid var(--faq-mute);
  border-bottom: 1.5px solid var(--faq-mute);
  transform: rotate(45deg);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-faq .qa[open] .qa__mark {
  transform: rotate(225deg);
  border-color: var(--ink-mid);
}

.page-faq .qa__answer {
  padding: 0 12px 22px 16px;
}

.page-faq .qa__answer p {
  margin: 0;
  max-width: 66ch;
  font-size: 17px;
  line-height: 1.78;
  color: var(--graphite);
}

/* 联系客服 */
.page-faq .faq-support {
  padding: 64px 0 56px;
}

.page-faq .faq-support__grid {
  display: grid;
  gap: 32px;
}

.page-faq .faq-support__title {
  margin: 0 0 14px;
  font-family: var(--font-title);
  font-size: clamp(26px, 3.6vw, 40px);
  font-weight: 900;
  letter-spacing: -.02em;
  color: var(--mist);
}

.page-faq .faq-support__lead {
  margin: 0;
  max-width: 52ch;
  font-size: 17px;
  line-height: 1.78;
  color: var(--silver);
}

.page-faq .faq-contact {
  margin: 0;
  border-top: 1px solid var(--faq-line-dark);
}

.page-faq .faq-contact__row {
  display: grid;
  gap: 6px;
  padding: 16px 0;
  border-bottom: 1px solid var(--faq-line-dark);
}

.page-faq .faq-contact__key {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--silver-dim);
}

.page-faq .faq-contact__val {
  margin: 0;
  font-size: 17px;
  line-height: 1.7;
  color: var(--mist);
}

.page-faq .faq-support__note {
  margin: 24px 0 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--silver-dim);
}

/* 相关页面入口 */
.page-faq .faq-links {
  display: grid;
  margin-top: 40px;
  border-top: 1px solid var(--faq-line-dark);
}

.page-faq .faq-link {
  display: block;
  padding: 24px 20px 26px 16px;
  text-decoration: none;
  border-bottom: 1px solid var(--faq-line-dark);
  border-left: 2px solid transparent;
  transition: background-color var(--dur) var(--ease), border-left-color var(--dur) var(--ease);
}

.page-faq .faq-link:hover {
  background-color: rgba(41, 240, 210, .06);
  border-left-color: var(--cyan);
}

.page-faq .faq-link__key {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--cyan);
}

.page-faq .faq-link__title {
  display: block;
  margin-bottom: 6px;
  font-size: 17px;
  font-weight: 700;
  color: var(--mist);
}

.page-faq .faq-link__note {
  display: block;
  font-size: 14px;
  line-height: 1.65;
  color: var(--silver-dim);
}

/* 平板及桌面 */
@media (min-width: 720px) {
  .page-faq .faq-support__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr);
    gap: 56px;
    align-items: start;
  }

  .page-faq .faq-contact__row {
    grid-template-columns: 110px minmax(0, 1fr);
    gap: 20px;
    align-items: baseline;
  }

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

  .page-faq .faq-link {
    border-bottom: 0;
    border-left: 1px solid var(--faq-line-dark);
    padding-left: 24px;
  }

  .page-faq .faq-link:first-child {
    border-left: 0;
    padding-left: 16px;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero {
    padding: 56px 0 60px;
  }

  .page-faq .faq-steps__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    gap: 56px;
    align-items: start;
  }

  .page-faq .faq-open {
    grid-template-columns: minmax(0, 1fr) 260px;
    gap: 48px;
    align-items: end;
  }

  .page-faq .qa__summary {
    grid-template-columns: 56px minmax(0, 1fr) 14px;
    gap: 16px;
    padding-left: 22px;
  }

  .page-faq .qa__answer {
    padding: 0 32px 24px 78px;
  }
}

@media (min-width: 960px) {
  .page-faq .faq-grid {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: 64px;
  }

  .page-faq .faq-index {
    position: sticky;
    top: 104px;
    align-self: start;
  }

  .page-faq .faq-index__list {
    flex-direction: column;
    gap: 0;
  }

  .page-faq .faq-group__head {
    grid-template-columns: 44px minmax(0, 1fr);
    gap: 18px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .step,
  .page-faq .qa::before,
  .page-faq .qa__q,
  .page-faq .qa__mark,
  .page-faq .faq-index__link,
  .page-faq .faq-open__jump a,
  .page-faq .faq-link,
  .page-faq .crumbs a {
    transition: none;
  }
}