.page-faq {
  --faq-line: rgba(61, 245, 208, .22);
  --faq-sticky: calc(var(--header-h) + 22px);
  display: block;
  background:
    radial-gradient(1100px 480px at 10% -10%, rgba(61, 245, 208, .07), transparent 62%),
    radial-gradient(880px 400px at 98% 2%, rgba(255, 122, 47, .055), transparent 60%);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding: clamp(26px, 4.6vw, 52px) 0 clamp(30px, 5vw, 54px);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.page-faq .faq-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 4vw, 40px);
  margin-top: clamp(16px, 3vw, 28px);
  align-items: end;
}

.page-faq .faq-hero__kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: var(--t-12);
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-faq .faq-hero__kicker::before {
  content: "";
  width: 26px;
  height: 1px;
  background: var(--cyan);
  opacity: .85;
}

.page-faq .faq-hero h1 {
  margin: 0 0 20px;
  max-width: 20ch;
  font-size: clamp(2.1rem, 6.2vw, 4.1rem);
  line-height: 1.06;
  font-weight: 900;
  letter-spacing: -.03em;
  color: var(--white);
}

.page-faq .faq-hero .lead {
  max-width: 46ch;
}

.page-faq .faq-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: var(--t-12);
  letter-spacing: .06em;
  color: var(--mist);
}

.page-faq .faq-hero__meta li {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
}

.page-faq .faq-hero__meta-num {
  font-size: var(--t-22);
  font-weight: 800;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

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

/* ---------- 分类导航 ---------- */
.page-faq .faq-nav__head {
  margin-bottom: clamp(18px, 2.4vw, 26px);
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-nav__title {
  margin: 0;
  font-size: clamp(1.4rem, 3vw, 1.9rem);
  line-height: 1.25;
  letter-spacing: -.02em;
  color: var(--white);
}

.page-faq .faq-nav__desc {
  margin: 10px 0 0;
  max-width: 60ch;
  font-size: var(--t-14);
  line-height: 1.75;
  color: var(--text-dim);
}

.page-faq .faq-cats {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-faq .faq-cat {
  position: relative;
  display: block;
  height: 100%;
  padding: clamp(16px, 2.4vw, 24px);
  background: var(--ink-2);
  text-decoration: none;
  color: inherit;
  transition: background-color .2s ease;
}

.page-faq .faq-cat::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--cyan);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform .24s ease;
}

.page-faq .faq-cat:hover,
.page-faq .faq-cat:focus-visible {
  background: #16222f;
}

.page-faq .faq-cat:hover::after,
.page-faq .faq-cat:focus-visible::after {
  transform: scaleY(1);
}

.page-faq .faq-cat:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -2px;
}

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

.page-faq .faq-cat__name {
  display: block;
  margin-bottom: 6px;
  font-size: var(--t-17);
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--white);
}

.page-faq .faq-cat__desc {
  display: block;
  margin-bottom: 14px;
  font-size: var(--t-14);
  line-height: 1.65;
  color: var(--text-dim);
}

.page-faq .faq-cat__count {
  display: inline-block;
  padding: 3px 8px;
  border: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: var(--t-12);
  color: var(--mist);
}

/* ---------- 问答主体布局 ---------- */
.page-faq .faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 52px);
  padding: clamp(38px, 5vw, 76px) 0;
}

.page-faq .faq-group {
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-faq .faq-group + .faq-group {
  margin-top: clamp(46px, 6vw, 84px);
}

.page-faq .faq-group__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  column-gap: 16px;
  align-items: baseline;
  margin-bottom: clamp(16px, 2.4vw, 26px);
  padding-bottom: 14px;
  border-bottom: 1px solid var(--faq-line);
}

.page-faq .faq-group__head .chapter__title {
  margin: 0;
}

.page-faq .faq-group__desc {
  grid-column: 2;
  margin: 10px 0 0;
  max-width: 62ch;
  font-size: var(--t-14);
  line-height: 1.75;
  color: var(--text-dim);
}

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

/* ---------- 问答条目 ---------- */
.page-faq .qa {
  border-bottom: 1px solid var(--line);
  transition: background-color .2s ease;
}

.page-faq .qa__q {
  display: grid;
  grid-template-columns: 32px minmax(0, 1fr) auto;
  gap: 12px;
  align-items: start;
  padding: clamp(15px, 2vw, 20px) 0;
  cursor: pointer;
  list-style: none;
  transition: color .2s ease;
}

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

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

.page-faq .qa__q:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -2px;
}

.page-faq .qa__num {
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: var(--t-12);
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--cyan-dim);
  font-variant-numeric: tabular-nums;
  transition: color .2s ease;
}

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

.page-faq .qa__text {
  font-size: var(--t-17);
  font-weight: 700;
  line-height: 1.55;
  letter-spacing: -.01em;
  color: var(--white);
  transition: color .2s ease;
}

.page-faq .qa__q:hover .qa__text {
  color: var(--cyan);
}

.page-faq .qa__icon {
  position: relative;
  width: 24px;
  height: 24px;
  flex: 0 0 auto;
  border: 1px solid var(--line-cyan);
  transition: border-color .2s ease, background-color .2s ease;
}

.page-faq .qa__icon::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 46%;
  width: 6px;
  height: 6px;
  border-right: 2px solid var(--cyan);
  border-bottom: 2px solid var(--cyan);
  transform: translate(-50%, -50%) rotate(45deg);
  transition: transform .24s ease;
}

.page-faq .qa[open] .qa__icon {
  background: rgba(61, 245, 208, .1);
}

.page-faq .qa[open] .qa__icon::after {
  transform: translate(-50%, -50%) rotate(-135deg);
}

.page-faq .qa__a {
  position: relative;
  padding: 2px 0 clamp(16px, 2.2vw, 22px) 44px;
  max-width: 72ch;
}

.page-faq .qa__a::before {
  content: "";
  position: absolute;
  left: 15px;
  top: 6px;
  bottom: 20px;
  width: 1px;
  background: repeating-linear-gradient(to bottom, var(--faq-line) 0 4px, transparent 4px 10px);
}

.page-faq .qa__a p {
  margin: 0;
  font-size: var(--t-17);
  line-height: 1.8;
  color: var(--text-dim);
}

.page-faq .qa__a p + p {
  margin-top: 10px;
}

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

.page-faq details[open] .qa__a {
  animation: faq-answer-in .24s ease both;
}

@keyframes faq-answer-in {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.page-faq .qa__steps {
  margin: 10px 0 0;
  padding: 0;
  list-style: none;
  counter-reset: faqstep;
  display: grid;
  gap: 8px;
}

.page-faq .qa__steps li {
  position: relative;
  counter-increment: faqstep;
  padding-left: 30px;
  font-size: var(--t-17);
  line-height: 1.7;
  color: var(--text-dim);
}

.page-faq .qa__steps li::before {
  content: counter(faqstep, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 3px;
  font-family: var(--font-mono);
  font-size: var(--t-12);
  font-weight: 700;
  color: var(--cyan);
}

/* ---------- 回访分组内的图文排布 ---------- */
.page-faq .faq-revisit__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 32px);
  align-items: start;
}

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

/* ---------- 右侧粘性分类索引 ---------- */
.page-faq .faq-index {
  display: none;
}

.page-faq .faq-index__label {
  margin: 0 0 14px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: var(--t-12);
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-faq .faq-index__list {
  display: grid;
  gap: 2px;
  margin: 0 0 20px;
  padding: 0;
  list-style: none;
}

.page-faq .faq-index__link {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 10px;
  align-items: baseline;
  padding: 10px 0;
  border-bottom: 1px dashed rgba(255, 255, 255, .08);
  font-size: var(--t-14);
  color: var(--text-dim);
  text-decoration: none;
  transition: color .2s ease, border-color .2s ease;
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--line-cyan);
}

.page-faq .faq-index__link:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-faq .faq-index__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--cyan-dim);
  transition: color .2s ease;
}

.page-faq .faq-index__link:hover .faq-index__num,
.page-faq .faq-index__link:focus-visible .faq-index__num {
  color: var(--cyan);
}

.page-faq .faq-index__count {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--mist);
}

.page-faq .faq-index__hint {
  margin: 0;
  font-size: var(--t-14);
  line-height: 1.7;
  color: var(--text-dim);
}

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

/* ---------- 兜底联系 ---------- */
.page-faq .faq-help {
  padding-bottom: clamp(48px, 7vw, 96px);
}

.page-faq .faq-help__card {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 34px);
  padding: clamp(22px, 3.4vw, 40px);
  border: 1px solid var(--line-cyan);
  background:
    linear-gradient(135deg, rgba(61, 245, 208, .07), transparent 46%),
    var(--ink-2);
}

.page-faq .faq-help__card::after {
  content: "";
  position: absolute;
  right: 0;
  top: 0;
  width: 84px;
  height: 3px;
  background: var(--orange);
}

.page-faq .faq-help__title {
  margin: 10px 0 12px;
  font-size: clamp(1.5rem, 3.2vw, 2rem);
  line-height: 1.2;
  letter-spacing: -.02em;
  color: var(--white);
}

.page-faq .faq-help__note {
  margin: 0 0 16px;
  max-width: 56ch;
  font-size: var(--t-17);
  line-height: 1.8;
  color: var(--text-dim);
}

.page-faq .faq-help__contact {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 12px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--t-14);
  color: var(--white);
}

.page-faq .faq-help__sep {
  color: var(--cyan);
}

.page-faq .faq-help__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-content: end;
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-faq .faq-cats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 820px) {
  .page-faq .faq-help__card {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
  }
}

@media (min-width: 860px) {
  .page-faq .faq-revisit__grid {
    grid-template-columns: minmax(0, 1fr) 258px;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
  }
}

@media (min-width: 1000px) {
  .page-faq .faq-layout {
    grid-template-columns: minmax(0, 1fr) 232px;
  }

  .page-faq .faq-index {
    display: block;
    order: 2;
    align-self: start;
    position: sticky;
    top: var(--faq-sticky);
  }
}

@media (min-width: 1040px) {
  .page-faq .faq-cats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (max-width: 480px) {
  .page-faq .qa__q {
    grid-template-columns: 28px minmax(0, 1fr) auto;
    gap: 10px;
  }

  .page-faq .qa__a {
    padding-left: 38px;
  }

  .page-faq .qa__a::before {
    left: 13px;
  }

  .page-faq .faq-hero__meta {
    gap: 8px 18px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa__a,
  .page-faq .qa__icon,
  .page-faq .qa__icon::after,
  .page-faq .faq-cat,
  .page-faq .faq-cat::after,
  .page-faq .faq-index__link {
    transition: none;
    animation: none;
  }
}