.page-faq {
  --faq-card: linear-gradient(180deg, rgba(10, 39, 69, .84), rgba(4, 20, 40, .88));
  --faq-card-open: linear-gradient(180deg, rgba(15, 58, 50, .58), rgba(10, 39, 69, .9));
  --faq-edge: rgba(0, 229, 208, .3);
  padding-bottom: clamp(3rem, 7vw, 5rem);
}

/* 首屏 */
.page-faq .trouble-lead {
  position: relative;
  overflow: hidden;
  padding: clamp(1.6rem, 4vw, 2.6rem) 0 clamp(1.8rem, 4vw, 2.8rem);
  border-bottom: 1px solid var(--line);
}

.page-faq .trouble-lead::before {
  content: "";
  position: absolute;
  inset: -20% -25% auto -25%;
  height: 150%;
  background:
    radial-gradient(45% 60% at 14% 0%, rgba(0, 229, 208, .14), transparent 68%),
    radial-gradient(42% 55% at 88% 18%, rgba(242, 184, 75, .09), transparent 72%);
  pointer-events: none;
}

.page-faq .trouble-lead .shell {
  position: relative;
  z-index: 1;
}

.page-faq .lead-title {
  margin: .7rem 0 0;
  max-width: 26ch;
  font-size: clamp(1.85rem, 5.6vw, 3.4rem);
  font-weight: 900;
  line-height: 1.16;
  letter-spacing: .01em;
  color: var(--white);
}

.page-faq .lead {
  margin: 1.1rem 0 0;
  max-width: 62ch;
  font-size: 1rem;
  line-height: 1.82;
  color: var(--mist);
}

.page-faq .lead-axis {
  display: block;
  width: min(320px, 72%);
  height: auto;
  margin-top: 1.5rem;
  color: var(--neon);
}

/* 排查路径总览 */
.page-faq .trouble-flow {
  padding-top: clamp(2.4rem, 5.5vw, 3.8rem);
}

.page-faq .flow-head {
  display: grid;
  gap: .3rem;
}

.page-faq .flow-head h2,
.page-faq .group-head .sec-title {
  margin: 0;
  color: var(--white);
  font-weight: 700;
  letter-spacing: .015em;
}

.page-faq .flow-head h2 {
  font-size: clamp(1.4rem, 3.8vw, 2.05rem);
}

.page-faq .flow-head p {
  margin: .55rem 0 0;
  max-width: 66ch;
  font-size: .95rem;
  line-height: 1.8;
  color: var(--mist);
}

.page-faq .flow-head .sec-num,
.page-faq .group-head .sec-num {
  font-size: clamp(1rem, 2.4vw, 1.35rem);
  line-height: 1;
  letter-spacing: .14em;
  color: var(--gold);
}

.page-faq .flow-steps {
  display: grid;
  gap: 1px;
  margin: clamp(1.4rem, 3.4vw, 2.2rem) 0 0;
  padding: 0;
  list-style: none;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--line);
  overflow: hidden;
}

.page-faq .flow-step {
  display: flex;
  flex-direction: column;
  gap: .5rem;
  padding: 1.3rem 1.15rem 1.5rem;
  background: var(--faq-card);
  transition: background .2s ease, transform .2s ease;
}

.page-faq .flow-step:hover {
  background: linear-gradient(180deg, rgba(18, 59, 99, .92), rgba(6, 27, 50, .92));
  transform: translateY(-2px);
}

.page-faq .flow-step__idx {
  font-size: .78rem;
  letter-spacing: .2em;
  color: var(--neon);
}

.page-faq .flow-step__title {
  margin: 0;
  font-size: 1.04rem;
  font-weight: 700;
  line-height: 1.5;
  color: var(--white);
}

.page-faq .flow-step__text {
  margin: 0;
  font-size: .875rem;
  line-height: 1.74;
  color: var(--mist);
}

.page-faq .flow-step__link {
  margin-top: auto;
  padding-top: .5rem;
  align-self: flex-start;
  font-size: .82rem;
  color: var(--neon-soft);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .18s ease, border-color .18s ease;
}

.page-faq .flow-step__link:hover {
  color: var(--neon);
  border-bottom-color: var(--neon);
}

.page-faq .flow-step__link:focus-visible {
  outline: 2px solid var(--ring);
  outline-offset: 3px;
}

.page-faq .flow-figure {
  margin: clamp(1.4rem, 3.4vw, 2rem) 0 0;
}

/* 分组 */
.page-faq .trouble-group {
  padding-top: clamp(2.8rem, 6.5vw, 4.4rem);
  scroll-margin-top: 5.5rem;
}

.page-faq .group-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: .25rem .95rem;
  align-items: baseline;
  padding-bottom: .9rem;
  border-bottom: 1px solid var(--line);
}

.page-faq .group-head .sec-title {
  font-size: clamp(1.3rem, 3.6vw, 1.95rem);
}

.page-faq .group-desc {
  grid-column: 1 / -1;
  margin: .35rem 0 0;
  max-width: 66ch;
  font-size: .93rem;
  line-height: 1.8;
  color: var(--mist);
}

/* 折叠问答 */
.page-faq .qa {
  display: grid;
  gap: .8rem;
  margin-top: 1.15rem;
}

.page-faq .qa-item {
  border: 1px solid var(--line-soft);
  border-left: 3px solid var(--faq-edge);
  border-radius: var(--radius);
  background: var(--faq-card);
  backdrop-filter: blur(6px);
  transition: transform .18s ease, border-color .18s ease, box-shadow .18s ease, background .18s ease;
}

.page-faq .qa-item:hover {
  transform: translateY(-2px);
  border-left-color: var(--neon);
  box-shadow: 0 14px 34px -24px rgba(0, 229, 208, .8);
}

.page-faq .qa-item[open] {
  background: var(--faq-card-open);
  border-left-color: var(--neon);
}

.page-faq .qa-item summary {
  display: flex;
  align-items: flex-start;
  gap: .8rem;
  padding: 1rem 1.05rem;
  cursor: pointer;
  list-style: none;
  color: var(--white);
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.62;
}

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

.page-faq .qa-item summary::after {
  content: "";
  flex: 0 0 auto;
  width: .62rem;
  height: .62rem;
  margin-top: .48rem;
  margin-left: auto;
  border-right: 2px solid var(--neon);
  border-bottom: 2px solid var(--neon);
  transform: rotate(45deg);
  transition: transform .2s ease;
}

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

.page-faq .qa-item summary:focus-visible {
  outline: 2px solid var(--ring);
  outline-offset: -2px;
  border-radius: var(--radius);
}

.page-faq .qa-q__idx {
  flex: 0 0 auto;
  padding-top: .16rem;
  font-size: .78rem;
  font-weight: 500;
  letter-spacing: .12em;
  color: var(--gold);
}

.page-faq .qa-body {
  padding: 0 1.05rem 1.2rem;
  border-top: 1px solid var(--line);
}

.page-faq .qa-item[open] .qa-body {
  animation: faq-fade .22s ease both;
}

@keyframes faq-fade {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: translateY(0); }
}

.page-faq .qa-body p {
  margin: .85rem 0 0;
  max-width: 68ch;
  font-size: .92rem;
  line-height: 1.8;
  color: var(--mist);
}

.page-faq .qa-steps {
  display: grid;
  gap: .55rem;
  margin: .85rem 0 0;
  padding: 0;
  max-width: 68ch;
  list-style: none;
  counter-reset: faqstep;
}

.page-faq .qa-steps li {
  position: relative;
  padding-left: 2.15rem;
  counter-increment: faqstep;
  font-size: .9rem;
  line-height: 1.78;
  color: var(--white);
}

.page-faq .qa-steps li::before {
  content: counter(faqstep, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: .16rem;
  font-family: var(--font-mono);
  font-size: .76rem;
  font-weight: 500;
  letter-spacing: .04em;
  color: var(--neon);
}

/* 移动端分组：问答与竖图并置 */
.page-faq .mobile-layout {
  display: grid;
  gap: 1.4rem;
  margin-top: 1.15rem;
}

.page-faq .mobile-aside {
  margin: 0;
  padding: .7rem;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: var(--faq-card);
  --ratio: 900 / 1200;
}

/* 联系路径 */
.page-faq .support-grid {
  display: grid;
  gap: .9rem;
  margin-top: 1.15rem;
}

.page-faq .support-card {
  padding: 1.15rem 1.1rem 1.25rem;
  border: 1px solid var(--line-soft);
  border-top: 2px solid var(--gold);
  border-radius: var(--radius);
  background: var(--faq-card);
  transition: transform .18s ease, box-shadow .18s ease;
}

.page-faq .support-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 34px -24px rgba(242, 184, 75, .75);
}

.page-faq .support-card__label {
  margin: 0;
  font-size: .78rem;
  letter-spacing: .16em;
  color: var(--neon-soft);
}

.page-faq .support-card__value {
  margin: .55rem 0 0;
  font-size: 1.02rem;
  font-weight: 500;
  letter-spacing: .02em;
  color: var(--gold);
  overflow-wrap: anywhere;
}

.page-faq .support-card__note {
  margin: .5rem 0 0;
  font-size: .85rem;
  line-height: 1.72;
  color: var(--mist);
}

.page-faq .support-actions {
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
  margin-top: 1.35rem;
}

.page-faq .support-foot {
  margin: 1.35rem 0 0;
  max-width: 68ch;
  font-size: .92rem;
  line-height: 1.82;
  color: var(--mist);
}

.page-faq .support-foot a {
  color: var(--neon-soft);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  transition: color .18s ease, border-color .18s ease;
}

.page-faq .support-foot a:hover {
  color: var(--neon);
  border-bottom-color: var(--neon);
}

.page-faq .support-foot a:focus-visible {
  outline: 2px solid var(--ring);
  outline-offset: 3px;
}

/* 响应式栅格 */
@media (min-width: 720px) {
  .page-faq .flow-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-faq .support-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-faq .mobile-layout {
    grid-template-columns: minmax(0, 1fr) minmax(0, 300px);
    align-items: start;
    gap: 1.8rem;
  }

  .page-faq .mobile-layout .qa {
    margin-top: 0;
  }

  .page-faq .qa-item summary {
    padding: 1.05rem 1.2rem;
  }

  .page-faq .qa-body {
    padding: 0 1.2rem 1.3rem;
  }
}

@media (min-width: 1040px) {
  .page-faq .flow-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-faq .flow-step {
    padding: 1.5rem 1.35rem 1.7rem;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa-item[open] .qa-body {
    animation: none;
  }

  .page-faq .qa-item:hover,
  .page-faq .flow-step:hover,
  .page-faq .support-card:hover {
    transform: none;
  }
}