.page-faq {
  --faq-max: 860px;
  --faq-num-col: 38px;
  position: relative;
  padding-bottom: 96px;
  background:
    linear-gradient(180deg, rgba(47, 233, 198, 0.055), rgba(6, 18, 14, 0) 420px),
    var(--c-ink);
  color: var(--txt);
}

.page-faq .wrap {
  max-width: var(--faq-max);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-head {
  position: relative;
  overflow: hidden;
  padding: 34px 0 6px;
}

.page-faq .faq-head::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(195, 204, 210, 0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(195, 204, 210, 0.055) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: radial-gradient(120% 110% at 18% 0%, #000 10%, transparent 72%);
  mask-image: radial-gradient(120% 110% at 18% 0%, #000 10%, transparent 72%);
  pointer-events: none;
}

.page-faq .faq-head .wrap {
  position: relative;
  z-index: 1;
}

.page-faq .breadcrumb {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.06em;
  color: var(--txt-faint);
}

.page-faq .breadcrumb a {
  color: var(--txt-dim);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--t-fast) ease, border-color var(--t-fast) ease;
}

.page-faq .breadcrumb a:hover {
  color: var(--c-cyan);
  border-bottom-color: rgba(47, 233, 198, 0.5);
}

.page-faq .breadcrumb span[aria-hidden] {
  margin: 0 8px;
  color: var(--line-strong);
}

.page-faq .kicker {
  margin: 26px 0 0;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-cyan);
}

.page-faq h1 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-size: clamp(32px, 7.4vw, 56px);
  font-weight: 900;
  font-stretch: 87%;
  line-height: 1.05;
  letter-spacing: -0.01em;
  color: var(--c-mist);
}

.page-faq h1::after {
  content: "";
  display: block;
  width: 56px;
  height: 3px;
  margin-top: 20px;
  background: linear-gradient(90deg, var(--c-cyan), var(--c-orange));
}

.page-faq .lede {
  margin: 22px 0 0;
  max-width: 62ch;
  font-size: var(--fs-16);
  line-height: 1.8;
  color: var(--txt-dim);
}

.page-faq .faq-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 0 36px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-facts li {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 12px 0 12px 14px;
  border-left: 2px solid var(--line);
}

.page-faq .faq-fact-val {
  font-size: var(--fs-28);
  line-height: 1;
  color: var(--c-mist);
  font-variant-numeric: tabular-nums;
}

.page-faq .faq-unit {
  margin-left: 3px;
  font-size: var(--fs-13);
  color: var(--c-cyan);
}

.page-faq .faq-fact-key {
  font-size: var(--fs-12);
  letter-spacing: 0.06em;
  color: var(--txt-faint);
}

/* ---------- 主题锚点条 ---------- */
.page-faq .faq-topics {
  margin-top: 34px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line-soft);
  background: rgba(13, 42, 33, 0.5);
}

.page-faq .faq-topic-list {
  display: flex;
  gap: 28px;
  margin: 0;
  padding: 11px 0;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.page-faq .faq-topic-list::-webkit-scrollbar {
  display: none;
}

.page-faq .faq-topic-list a {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  white-space: nowrap;
  font-size: var(--fs-13);
  color: var(--txt-dim);
  text-decoration: none;
  padding-bottom: 3px;
  border-bottom: 1px solid transparent;
  transition: color var(--t-fast) ease, border-color var(--t-fast) ease;
}

.page-faq .faq-topic-list a .mono {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--c-orange);
  font-variant-numeric: tabular-nums;
}

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

/* ---------- 分组 ---------- */
.page-faq .faq-group {
  padding: 46px 0 4px;
  scroll-margin-top: 24px;
}

.page-faq .faq-group-head {
  display: grid;
  grid-template-columns: 44px 1fr;
  column-gap: 12px;
  align-items: baseline;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-group-num {
  grid-column: 1;
  font-family: var(--font-mono);
  font-size: var(--fs-13);
  letter-spacing: 0.12em;
  color: var(--c-cyan);
  font-variant-numeric: tabular-nums;
}

.page-faq .faq-group-head h2 {
  grid-column: 2;
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(22px, 4vw, 28px);
  font-weight: 800;
  font-stretch: 87%;
  line-height: 1.2;
  color: var(--c-mist);
}

.page-faq .faq-group-note {
  grid-column: 2;
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--txt-faint);
}

/* ---------- 折叠条目 ---------- */
.page-faq .faq-items {
  margin-top: 4px;
}

.page-faq .faq-item {
  border-bottom: 1px solid var(--line-soft);
  border-left: 3px solid transparent;
  padding-left: 11px;
  transition: border-color var(--t-fast) ease, background-color var(--t-fast) ease;
}

.page-faq .faq-item:hover {
  background: rgba(237, 244, 241, 0.025);
}

.page-faq .faq-item[open] {
  border-left-color: var(--c-cyan);
  background: linear-gradient(90deg, rgba(47, 233, 198, 0.06), rgba(47, 233, 198, 0) 68%);
}

.page-faq .faq-item summary {
  display: grid;
  grid-template-columns: var(--faq-num-col) 1fr 18px;
  gap: 12px;
  align-items: start;
  padding: 17px 6px 17px 4px;
  cursor: pointer;
  list-style: none;
  font-size: var(--fs-16);
  line-height: 1.6;
}

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

.page-faq .faq-item summary::marker {
  content: "";
}

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

.page-faq .faq-item-num {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  line-height: 1.9;
  color: var(--txt-faint);
  font-variant-numeric: tabular-nums;
  transition: color var(--t-fast) ease;
}

.page-faq .faq-item[open] .faq-item-num {
  color: var(--c-cyan);
}

.page-faq .faq-item-q {
  color: var(--c-mist);
}

.page-faq .faq-item-icon {
  position: relative;
  width: 18px;
  height: 18px;
  margin-top: 5px;
}

.page-faq .faq-item-icon::before,
.page-faq .faq-item-icon::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  background: var(--c-silver);
  transition: transform 160ms ease, background-color 160ms ease;
}

.page-faq .faq-item-icon::before {
  width: 12px;
  height: 1px;
  transform: translate(-50%, -50%);
}

.page-faq .faq-item-icon::after {
  width: 1px;
  height: 12px;
  transform: translate(-50%, -50%);
}

.page-faq .faq-item[open] .faq-item-icon::before {
  background: var(--c-cyan);
}

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

.page-faq .faq-item-a {
  padding: 0 6px 20px calc(var(--faq-num-col) + 16px);
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--txt-dim);
}

.page-faq .faq-item-a p {
  margin: 0 0 10px;
  max-width: 60ch;
}

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

/* ---------- 配图 ---------- */
.page-faq .faq-figure {
  margin: 26px 0 0;
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--line);
  background: var(--c-panel);
}

.page-faq .faq-figure--tall img {
  width: auto;
  max-width: 100%;
  max-height: 560px;
  margin: 0 auto;
}

.page-faq .media-caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  line-height: 1.7;
  letter-spacing: 0.02em;
  color: var(--txt-faint);
  max-width: 64ch;
}

/* ---------- 延伸链接 ---------- */
.page-faq .faq-more {
  margin: 18px 0 0;
}

.page-faq .link-more {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.05em;
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 233, 198, 0.35);
  padding-bottom: 3px;
  transition: border-color var(--t-fast) ease, color var(--t-fast) ease;
}

.page-faq .link-more::before {
  content: "→ ";
  color: var(--c-orange);
}

.page-faq .link-more:hover {
  border-bottom-color: var(--c-cyan);
}

/* ---------- 底部求助 ---------- */
.page-faq .faq-help {
  margin-top: 56px;
  padding: 28px 24px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--c-orange);
  background: var(--c-panel);
}

.page-faq .faq-help-head .kicker {
  margin: 0;
  color: var(--c-orange);
}

.page-faq .faq-help-head h2 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-size: clamp(20px, 3.6vw, 26px);
  font-weight: 800;
  font-stretch: 87%;
  line-height: 1.25;
  color: var(--c-mist);
}

.page-faq .faq-help-body {
  margin: 14px 0 0;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--txt-dim);
}

.page-faq .faq-help-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 18px;
  margin: 22px 0 0;
}

.page-faq .faq-help-actions .link {
  font-size: var(--fs-13);
  color: var(--txt-dim);
  text-decoration: none;
  border-bottom: 1px solid var(--line-strong);
  padding-bottom: 2px;
  transition: color var(--t-fast) ease, border-color var(--t-fast) ease;
}

.page-faq .faq-help-actions .link:hover {
  color: var(--c-cyan);
  border-bottom-color: var(--c-cyan);
}

/* ---------- 响应式 ---------- */
@media (max-width: 620px) {
  .page-faq {
    --faq-num-col: 30px;
  }

  .page-faq .faq-head {
    padding-top: 24px;
  }

  .page-faq .faq-facts {
    gap: 0 22px;
  }

  .page-faq .faq-topic-list {
    gap: 20px;
  }

  .page-faq .faq-group {
    padding-top: 40px;
  }

  .page-faq .faq-group-head {
    grid-template-columns: 34px 1fr;
    column-gap: 10px;
  }

  .page-faq .faq-item {
    padding-left: 8px;
  }

  .page-faq .faq-item summary {
    grid-template-columns: var(--faq-num-col) 1fr 16px;
    gap: 9px;
    padding: 15px 4px 15px 2px;
    font-size: 15.5px;
  }

  .page-faq .faq-item-a {
    padding: 0 4px 18px 0;
    font-size: 15px;
  }

  .page-faq .faq-help {
    padding: 22px 16px;
  }

  .page-faq .faq-figure--tall img {
    max-height: 420px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item,
  .page-faq .faq-item-icon::before,
  .page-faq .faq-item-icon::after,
  .page-faq .faq-item-num,
  .page-faq .link-more,
  .page-faq .faq-topic-list a {
    transition: none;
  }
}