.page-faq {
  --faq-gap: 40px;
  --faq-cut: var(--cut);
}

/* ============ 面包屑 ============ */
.page-faq .crumb {
  margin: 24px 0 0;
}

/* ============ 首屏 ============ */
.page-faq .faq-hero {
  padding: 28px 0 56px;
}
.page-faq .faq-hero__inner {
  display: grid;
  gap: 36px;
}
.page-faq .faq-hero h1 {
  font-size: clamp(30px, 5vw, 56px);
  line-height: 1.08;
  letter-spacing: -0.015em;
  margin: 14px 0 20px;
}
.page-faq .faq-hero__text .lede {
  max-width: 60ch;
  margin: 0;
}
.page-faq .faq-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.page-faq .faq-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  box-shadow: inset 0 0 0 1px var(--line);
  clip-path: var(--cut);
  margin: 0;
}
.page-faq .faq-stat {
  background: var(--panel);
  padding: 18px 18px 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  position: relative;
}
.page-faq .faq-stat::before {
  content: "";
  position: absolute;
  left: 18px;
  top: 14px;
  width: 10px;
  height: 1px;
  background: var(--cyan);
}
.page-faq .faq-stat__label {
  margin: 0;
  padding-top: 12px;
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--muted);
}
.page-faq .faq-stat__num {
  margin: 0;
  font-size: 28px;
  line-height: 1;
  color: var(--gold);
  font-weight: 700;
  letter-spacing: 0.02em;
}

/* ============ 主体双栏 ============ */
.page-faq .faq-body {
  padding: 12px 0 56px;
}
.page-faq .faq-layout {
  display: grid;
  gap: 36px;
}

/* ============ 左侧场景索引 ============ */
.page-faq .faq-rail {
  background: var(--panel);
  clip-path: var(--cut);
  box-shadow: inset 0 0 0 1px var(--line);
  padding: 24px 22px 22px;
  position: relative;
}
.page-faq .faq-rail__label {
  margin: 0 0 14px;
  padding-left: 14px;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--cyan);
  text-transform: uppercase;
  position: relative;
}
.page-faq .faq-rail__label::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 8px;
  height: 1px;
  background: var(--cyan);
  transform: translateY(-50%);
}
.page-faq .faq-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--line);
}
.page-faq .faq-rail__item a {
  display: grid;
  grid-template-columns: 28px 1fr;
  gap: 10px;
  align-items: baseline;
  padding: 13px 4px;
  border-bottom: 1px solid var(--line);
  color: var(--white);
  text-decoration: none;
  transition: color 220ms var(--ease), padding-left 220ms var(--ease);
}
.page-faq .faq-rail__item a:hover,
.page-faq .faq-rail__item a:focus-visible {
  color: var(--cyan);
  padding-left: 12px;
}
.page-faq .faq-rail__no {
  color: var(--gold);
  font-size: 12px;
  letter-spacing: 0.08em;
  font-weight: 700;
}
.page-faq .faq-rail__txt {
  font-size: 14px;
  line-height: 1.45;
}
.page-faq .faq-rail__figure {
  margin: 20px 0 14px;
}
.page-faq .faq-rail__figure .figure__img {
  width: 100%;
  height: auto;
  object-fit: cover;
}
.page-faq .faq-rail__hint {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}
.page-faq .faq-rail__hint a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(38, 226, 210, 0.35);
}
.page-faq .faq-rail__hint a:hover {
  border-bottom-color: var(--cyan);
}

/* ============ 右侧问答流 ============ */
.page-faq .faq-stream {
  display: flex;
  flex-direction: column;
  gap: 56px;
}
.page-faq .faq-group {
  scroll-margin-top: 28px;
}
.page-faq .faq-group__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 8px 16px;
  align-items: baseline;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 18px;
}
.page-faq .faq-group__no {
  color: var(--gold);
  font-size: 14px;
  letter-spacing: 0.1em;
  font-weight: 700;
  line-height: 1.4;
}
.page-faq .faq-group__title {
  margin: 0;
  font-size: clamp(20px, 2.6vw, 27px);
  letter-spacing: -0.01em;
  line-height: 1.2;
}
.page-faq .faq-group__lead {
  grid-column: 2 / -1;
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--muted);
}
.page-faq .faq-group__figure {
  margin: 0 0 20px;
}
.page-faq .faq-group__figure .figure__img {
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ============ 可展开问答条目 ============ */
.page-faq .qa {
  --qa-px: 18px;
  --qa-no-w: 32px;
  --qa-col-gap: 14px;
  position: relative;
  border: 1px solid var(--line);
  background: var(--panel);
  clip-path: var(--cut-sm);
  margin: 0 0 10px;
  isolation: isolate;
  transition: border-color 240ms var(--ease), box-shadow 240ms var(--ease);
}
.page-faq .qa:last-child {
  margin-bottom: 0;
}
.page-faq .qa:hover {
  border-color: rgba(38, 226, 210, 0.45);
}
.page-faq .qa[open] {
  border-color: var(--cyan);
  box-shadow: 0 0 0 1px rgba(38, 226, 210, 0.22);
}
.page-faq .qa::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(115deg, transparent 32%, rgba(38, 226, 210, 0.2) 50%, transparent 68%);
  transform: translateX(-125%);
  opacity: 0;
  pointer-events: none;
  z-index: 3;
}
.page-faq .qa[open]::after {
  animation: page-faq-sweep 720ms var(--ease) 40ms 1 both;
}
@keyframes page-faq-sweep {
  0% { transform: translateX(-125%); opacity: 1; }
  65% { opacity: 1; }
  100% { transform: translateX(125%); opacity: 0; }
}

.page-faq .qa__q {
  list-style: none;
  cursor: pointer;
  display: grid;
  grid-template-columns: var(--qa-no-w) minmax(0, 1fr) auto;
  gap: var(--qa-col-gap);
  align-items: center;
  padding: 16px var(--qa-px);
  font-size: 15px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--white);
  position: relative;
  z-index: 2;
}
.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__no {
  color: var(--gold);
  font-size: 13px;
  letter-spacing: 0.08em;
  font-weight: 700;
}
.page-faq .qa__title {
  display: block;
}
.page-faq .qa__arrow {
  width: 9px;
  height: 9px;
  border-right: 1.6px solid var(--muted);
  border-bottom: 1.6px solid var(--muted);
  transform: rotate(45deg) translate(-2px, -2px);
  flex: none;
  transition: transform 240ms var(--ease), border-color 240ms var(--ease);
}
.page-faq .qa[open] .qa__arrow {
  transform: rotate(-135deg) translate(-2px, -2px);
  border-color: var(--cyan);
}

.page-faq .qa__a {
  position: relative;
  z-index: 2;
  padding: 0 var(--qa-px) 18px calc(var(--qa-px) + var(--qa-no-w) + var(--qa-col-gap));
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--white);
}
.page-faq .qa__lead {
  margin: 0 0 10px;
  color: var(--cyan);
  font-weight: 600;
}
.page-faq .qa__steps {
  list-style: none;
  counter-reset: step;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.page-faq .qa__steps li {
  counter-increment: step;
  position: relative;
  padding-left: 30px;
  font-size: 14px;
  color: var(--muted);
  line-height: 1.7;
}
.page-faq .qa__steps li::before {
  content: counter(step, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--gold);
  line-height: 1.9;
}

/* ============ 人工协助 ============ */
.page-faq .faq-help {
  padding-bottom: 88px;
}
.page-faq .faq-help__panel {
  position: relative;
  background: var(--panel);
  clip-path: var(--cut);
  box-shadow: inset 0 0 0 1px var(--line);
  padding: 36px 26px 32px;
  overflow: hidden;
}
.page-faq .faq-help__panel::before {
  content: "";
  position: absolute;
  top: -60%;
  right: -18%;
  width: 70%;
  height: 220%;
  background: radial-gradient(closest-side, rgba(38, 226, 210, 0.16), transparent 72%);
  pointer-events: none;
}
.page-faq .faq-help__panel > * {
  position: relative;
  z-index: 1;
}
.page-faq .faq-help__panel h2 {
  font-size: clamp(22px, 3vw, 32px);
  letter-spacing: -0.01em;
  margin: 10px 0 12px;
}
.page-faq .faq-help__lead {
  max-width: 62ch;
  margin: 0 0 26px;
  color: var(--muted);
  line-height: 1.75;
}
.page-faq .faq-help__grid {
  display: grid;
  gap: 1px;
  background: var(--line);
  box-shadow: inset 0 0 0 1px var(--line);
  clip-path: var(--cut-sm);
}
.page-faq .faq-help__item {
  background: var(--ink);
  padding: 18px 20px 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.page-faq .faq-help__label {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--cyan);
  text-transform: uppercase;
}
.page-faq .faq-help__value {
  margin: 0;
  font-size: 15px;
  line-height: 1.6;
  color: var(--white);
  word-break: break-word;
}
.page-faq .faq-help__value a {
  color: var(--white);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  transition: color 200ms var(--ease), border-color 200ms var(--ease);
}
.page-faq .faq-help__value a:hover,
.page-faq .faq-help__value a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}
.page-faq .faq-help__item .copy-btn {
  align-self: flex-start;
  margin-top: 4px;
}
.page-faq .faq-help__note {
  margin: 22px 0 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--muted);
}
.page-faq .faq-help__note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(38, 226, 210, 0.35);
}
.page-faq .faq-help__note a:hover {
  border-bottom-color: var(--cyan);
}

/* ============ 响应式 ============ */
@media (min-width: 640px) {
  .page-faq .faq-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-faq .faq-stat {
    padding: 20px 18px 22px;
  }
  .page-faq .faq-stat__num {
    font-size: 30px;
  }
  .page-faq .faq-rail {
    padding: 28px 26px 24px;
  }
}

@media (min-width: 720px) {
  .page-faq .faq-help__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-faq .faq-help__panel {
    padding: 44px 40px 38px;
  }
}

@media (min-width: 960px) {
  .page-faq .faq-hero__inner {
    grid-template-columns: minmax(0, 1.4fr) minmax(320px, 1fr);
    gap: 48px;
    align-items: end;
  }
  .page-faq .faq-layout {
    grid-template-columns: 268px minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }
  .page-faq .faq-rail {
    position: sticky;
    top: 28px;
    max-height: calc(100vh - 48px);
    overflow-y: auto;
  }
  .page-faq .qa__q {
    font-size: 15.5px;
    padding: 17px var(--qa-px);
  }
}

@media (min-width: 1200px) {
  .page-faq .faq-layout {
    grid-template-columns: 288px minmax(0, 1fr);
    gap: 72px;
  }
  .page-faq .faq-stream {
    gap: 64px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa[open]::after {
    animation: none;
    opacity: 0;
  }
  .page-faq .qa,
  .page-faq .qa__arrow,
  .page-faq .faq-rail__item a {
    transition: none;
  }
}