.page-faq {
  --faq-rule: rgba(124, 138, 166, 0.26);
  --faq-rule-soft: rgba(124, 138, 166, 0.15);
  --faq-paper-rule: rgba(26, 26, 31, 0.16);
  --faq-accent: var(--cyan);
  position: relative;
  isolation: isolate;
  background: var(--ink);
  color: var(--fg);
  padding: 0 0 104px;
  overflow-x: clip;
}

.page-faq::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(to right, rgba(124, 138, 166, 0.12) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(124, 138, 166, 0.12) 1px, transparent 1px);
  background-size: 88px 88px;
  -webkit-mask-image: linear-gradient(to bottom, #000 0, rgba(0, 0, 0, 0.35) 55%, transparent 100%);
  mask-image: linear-gradient(to bottom, #000 0, rgba(0, 0, 0, 0.35) 55%, transparent 100%);
  pointer-events: none;
}

.page-faq .breadcrumbs {
  padding-top: 26px;
}

/* ── 首屏 ── */
.page-faq .faq-hero {
  display: grid;
  gap: 34px;
  padding-top: 22px;
}

.page-faq .faq-hero__kicker {
  position: relative;
  margin: 0 0 16px;
  padding-left: 28px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-faq .faq-hero__kicker::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 16px;
  height: 2px;
  background: var(--cyan);
}

.page-faq .faq-hero__title {
  margin: 0 0 20px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(46px, 10vw, 94px);
  line-height: 0.92;
  letter-spacing: -0.02em;
  color: var(--fg);
}

.page-faq .faq-hero__lead {
  max-width: 48ch;
  margin: 0 0 26px;
  font-size: 16px;
  line-height: 1.88;
  color: var(--fg-soft);
}

.page-faq .faq-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-jump__link {
  display: inline-block;
  padding: 6px 11px;
  border: 1px solid var(--line-strong);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--fg-soft);
  text-decoration: none;
  transition: color var(--dur) var(--ease), background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-faq .faq-jump__link:hover,
.page-faq .faq-jump__link:focus-visible {
  border-color: var(--cyan);
  background: var(--cyan);
  color: var(--ink);
}

/* ── 速查表 ── */
.page-faq .faq-lookup {
  border: 1px solid var(--line-strong);
  background: linear-gradient(165deg, rgba(22, 34, 74, 0.92), rgba(11, 18, 32, 0.96));
  box-shadow: 10px 10px 0 -1px rgba(53, 230, 210, 0.09);
}

.page-faq .faq-lookup__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px 14px;
  padding: 13px 18px;
  border-bottom: 1px solid var(--line-strong);
  border-left: 4px solid var(--cyan);
  background: rgba(11, 18, 32, 0.62);
}

.page-faq .faq-lookup__title {
  font-family: var(--font-serif);
  font-size: 17px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--fg);
}

.page-faq .faq-lookup__ver {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.page-faq .faq-lookup__table {
  width: 100%;
  border-collapse: collapse;
  table-layout: fixed;
}

.page-faq .faq-lookup__table th:nth-child(1) { width: 34%; }
.page-faq .faq-lookup__table th:nth-child(2) { width: 46%; }
.page-faq .faq-lookup__table th:nth-child(3) { width: 20%; }

.page-faq .faq-lookup__table th,
.page-faq .faq-lookup__table td {
  padding: 11px 16px;
  border-bottom: 1px solid var(--faq-rule-soft);
  text-align: left;
  vertical-align: top;
}

.page-faq .faq-lookup__table thead th {
  position: sticky;
  top: var(--header-h);
  z-index: 3;
  background: #16224a;
  border-bottom: 1px solid var(--line-strong);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.12em;
  color: var(--grid);
}

.page-faq .faq-lookup__table tbody tr:last-child th,
.page-faq .faq-lookup__table tbody tr:last-child td {
  border-bottom: 0;
}

.page-faq .faq-lookup__field {
  font-weight: 400;
}

.page-faq .faq-lookup__value {
  font-size: 13px;
  line-height: 1.7;
  color: var(--fg-soft);
}

.page-faq .faq-lookup__ver-cell {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--cyan);
  white-space: nowrap;
}

.page-faq .faq-term {
  position: relative;
  display: inline-block;
  border-bottom: 1px dashed var(--grid);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--fg);
  cursor: help;
}

.page-faq .faq-term::after {
  content: attr(data-def);
  position: absolute;
  left: 0;
  bottom: calc(100% + 10px);
  width: min(268px, 62vw);
  padding: 9px 11px;
  border: 1px solid var(--paper-ink);
  background: var(--paper);
  color: var(--paper-ink);
  font-family: var(--font-body);
  font-size: 12px;
  line-height: 1.65;
  letter-spacing: 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(4px);
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease), visibility var(--dur);
  pointer-events: none;
  z-index: 12;
}

.page-faq .faq-term:hover::after,
.page-faq .faq-term:focus-visible::after {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.page-faq .faq-lookup__note {
  margin: 0;
  padding: 12px 18px 14px;
  border-top: 1px solid var(--faq-rule-soft);
  font-size: 12px;
  line-height: 1.75;
  color: var(--fg-mute);
}

/* ── 图片 ── */
.page-faq .faq-hero__figure {
  margin: 4px 0 0;
}

.page-faq .faq-hero__figure .figure__caption,
.page-faq .faq-aside__figure .figure__caption {
  color: var(--fg-mute);
}

.page-faq .faq-aside__figure {
  margin: 0 0 22px;
}

.page-faq .faq-aside__figure .figure__img {
  aspect-ratio: 1 / 1;
  height: auto;
  object-fit: cover;
}

/* ── 流程布局 ── */
.page-faq .faq-flow {
  display: grid;
  gap: 44px;
  padding-top: 76px;
}

/* ── 分组 ── */
.page-faq .faq-group {
  margin: 0 0 58px;
  scroll-margin-top: calc(var(--header-h) + 20px);
}

.page-faq .faq-group:last-child {
  margin-bottom: 0;
}

.page-faq .faq-group--scope { --faq-accent: var(--cyan); }
.page-faq .faq-group--edge { --faq-accent: var(--orange); }
.page-faq .faq-group--sample { --faq-accent: var(--lime); }
.page-faq .faq-group--cross { --faq-accent: var(--cyan); }
.page-faq .faq-group--cite { --faq-accent: var(--orange); }

.page-faq .faq-group__bar {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 16px;
  margin-bottom: 4px;
  padding: 13px 34px 13px 18px;
  border-left: 4px solid var(--faq-accent);
  background: linear-gradient(100deg, rgba(22, 34, 74, 0.94), rgba(16, 26, 51, 0.5));
  clip-path: polygon(0 0, 100% 0, calc(100% - 26px) 100%, 0 100%);
}

.page-faq .faq-group__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--faq-accent);
}

.page-faq .faq-group__title {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 600;
  color: var(--fg);
}

.page-faq .faq-group__hint {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--fg-mute);
}

/* ── 折叠问答 ── */
.page-faq .faq-item {
  border-bottom: 1px solid var(--faq-rule);
}

.page-faq .faq-item__summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) 22px;
  gap: 14px;
  align-items: start;
  padding: 19px 6px 19px 4px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-serif);
  font-size: 17px;
  line-height: 1.6;
  color: var(--fg);
  transition: color var(--dur) var(--ease);
}

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

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

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

.page-faq .faq-item__num {
  padding-top: 5px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--grid);
  transition: color var(--dur) var(--ease);
}

.page-faq .faq-item[open] .faq-item__num {
  color: var(--faq-accent);
}

.page-faq .faq-item__q {
  display: block;
}

.page-faq .faq-item__mark {
  position: relative;
  width: 20px;
  height: 20px;
  margin-top: 5px;
}

.page-faq .faq-item__mark::before,
.page-faq .faq-item__mark::after {
  content: "";
  position: absolute;
  background: var(--grid);
  transition: transform var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-faq .faq-item__mark::before {
  left: 0;
  right: 0;
  top: 9px;
  height: 2px;
}

.page-faq .faq-item__mark::after {
  top: 0;
  bottom: 0;
  left: 9px;
  width: 2px;
}

.page-faq .faq-item[open] .faq-item__mark::after {
  transform: scaleY(0);
}

.page-faq .faq-item[open] .faq-item__mark::before {
  background: var(--faq-accent);
}

.page-faq .faq-item__body {
  position: relative;
  margin: 0 0 22px;
  padding: 20px 22px 18px;
  border: 1px solid var(--paper-ink);
  background: var(--paper);
  color: var(--paper-ink);
  box-shadow: 7px 7px 0 rgba(53, 230, 210, 0.14);
  animation: faq-lift 300ms var(--ease) both;
}

.page-faq .faq-item__body::before {
  content: "";
  position: absolute;
  inset: 5px;
  border: 1px dashed rgba(26, 26, 31, 0.2);
  pointer-events: none;
}

.page-faq .faq-item__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.9;
}

.page-faq .faq-item__foot {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 18px;
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px solid var(--faq-paper-rule);
}

.page-faq .faq-ver {
  display: inline-block;
  padding: 3px 8px;
  border: 1px solid var(--paper-ink);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--paper-ink);
  text-decoration: none;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-faq .faq-ver:hover,
.page-faq .faq-ver:focus-visible {
  background: var(--paper-ink);
  color: var(--paper);
}

.page-faq .faq-more {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--paper-ink);
  text-decoration: none;
  border-bottom: 1px solid var(--paper-ink);
}

.page-faq .faq-more:hover,
.page-faq .faq-more:focus-visible {
  color: #b3316d;
  border-bottom-color: #b3316d;
}

@keyframes faq-lift {
  from {
    opacity: 0;
    transform: translateY(7px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ── 版本对照 ── */
.page-faq .faq-versions {
  margin-top: 26px;
  padding: 22px 22px 6px;
  border: 1px solid var(--faq-rule);
  border-left: 3px solid var(--lime);
  background: rgba(16, 26, 51, 0.5);
  scroll-margin-top: calc(var(--header-h) + 20px);
}

.page-faq .faq-versions__label {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--lime);
}

.page-faq .faq-versions .timeline__text {
  color: var(--fg-mute);
}

/* ── 侧栏 ── */
.page-faq .faq-aside__note {
  padding-top: 18px;
  border-top: 1px solid var(--faq-rule);
}

.page-faq .faq-aside__lead {
  margin: 0 0 14px;
  font-size: 13px;
  line-height: 1.8;
  color: var(--fg-mute);
}

.page-faq .faq-aside__links {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.page-faq .faq-aside__links a {
  display: block;
  padding-left: 15px;
  position: relative;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  color: var(--fg-soft);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}

.page-faq .faq-aside__links a::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 7px;
  height: 1px;
  background: var(--grid);
  transition: background var(--dur) var(--ease), width var(--dur) var(--ease);
}

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

.page-faq .faq-aside__links a:hover::before,
.page-faq .faq-aside__links a:focus-visible::before {
  width: 11px;
  background: var(--cyan);
}

/* ── 响应式 ── */
@media (min-width: 1024px) {
  .page-faq .faq-hero {
    grid-template-columns: minmax(0, 0.86fr) minmax(0, 1.14fr);
    column-gap: 64px;
    row-gap: 46px;
    align-items: start;
    padding-top: 34px;
  }

  .page-faq .faq-hero__figure {
    grid-column: 1 / -1;
  }
}

@media (min-width: 1080px) {
  .page-faq .faq-flow {
    grid-template-columns: minmax(0, 1fr) 264px;
    column-gap: 56px;
    align-items: start;
  }

  .page-faq .faq-flow__aside {
    position: sticky;
    top: calc(var(--header-h) + 28px);
  }
}

@media (max-width: 640px) {
  .page-faq .faq-lookup__table th,
  .page-faq .faq-lookup__table td {
    padding: 9px 11px;
  }

  .page-faq .faq-lookup__table thead th {
    letter-spacing: 0.06em;
  }

  .page-faq .faq-hero__lead {
    font-size: 15px;
  }

  .page-faq .faq-item__summary {
    grid-template-columns: auto minmax(0, 1fr) 18px;
    gap: 10px;
    font-size: 16px;
  }

  .page-faq .faq-item__body {
    padding: 16px 16px 14px;
  }

  .page-faq .faq-group__bar {
    padding-right: 30px;
  }

  .page-faq .faq-versions {
    padding: 18px 16px 4px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item__body {
    animation: none;
  }

  .page-faq .faq-jump__link,
  .page-faq .faq-item__summary,
  .page-faq .faq-item__mark::before,
  .page-faq .faq-item__mark::after,
  .page-faq .faq-term::after {
    transition-duration: 1ms;
  }
}