.page-faq {
  --faq-rail-w: 15rem;
  --faq-stream-gap: 2.25rem;
  --faq-hair: var(--line-soft);
  position: relative;
  background:
    radial-gradient(1100px 460px at 10% -6%, rgba(30, 67, 89, .55), transparent 62%),
    var(--ink);
  color: var(--paper);
  padding-bottom: 4.5rem;
  overflow-x: hidden;
}

.page-faq .wrap {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 1.4rem;
}

/* ---------- 面包屑 ---------- */
.page-faq .crumbs {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: .45rem;
  padding-top: 1.6rem;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .08em;
  color: var(--mist);
}

.page-faq .crumbs__link {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .18s var(--ease), border-color .18s var(--ease);
}

.page-faq .crumbs__link:hover {
  color: var(--amber-bright);
  border-bottom-color: var(--amber-bright);
}

.page-faq .crumbs__link:focus-visible {
  outline: 2px solid var(--celadon-bright);
  outline-offset: 3px;
}

.page-faq .crumbs__sep {
  color: var(--line);
}

.page-faq .crumbs__item:last-child .crumbs__link {
  color: var(--paper-soft);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  padding: 2rem 0 2.75rem;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-hero h1 {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(30px, 4.4vw, 52px);
  line-height: 1.14;
  letter-spacing: -.01em;
  margin: .65rem 0 1.1rem;
  max-width: 24ch;
  color: var(--paper);
}

.page-faq .faq-hero__lede {
  max-width: 64ch;
  margin: 0;
  color: var(--mist);
  font-size: 1.0625rem;
  line-height: 1.85;
}

.page-faq .faq-stats {
  display: grid;
  grid-template-columns: 1fr;
  margin-top: 2.25rem;
  border-top: 1px solid var(--line);
}

.page-faq .faq-stats__item {
  padding: .95rem 0;
  border-bottom: 1px solid var(--faq-hair);
}

.page-faq .faq-stats__num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 1.0625rem;
  letter-spacing: .04em;
  color: var(--amber-bright);
}

.page-faq .faq-stats__label {
  display: block;
  margin-top: .3rem;
  font-size: .875rem;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 左右分栏 ---------- */
.page-faq .faq-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2rem;
  padding-top: 2.5rem;
}

.page-faq .faq-stream {
  min-width: 0;
}

/* ---------- 左侧索引轴 ---------- */
.page-faq .faq-rail {
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: rgba(16, 43, 63, .48);
  padding: 1rem 1rem 1.1rem;
}

.page-faq .index-rail__label {
  margin: 0 0 .8rem;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-faq .index-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: .1rem;
}

.page-faq .index-rail__link {
  display: flex;
  align-items: baseline;
  gap: .6rem;
  padding: .45rem .55rem;
  border-left: 2px solid transparent;
  border-radius: var(--r-xs);
  color: var(--paper-soft);
  font-size: .9375rem;
  text-decoration: none;
  transition: background .18s var(--ease), color .18s var(--ease), border-color .18s var(--ease);
}

.page-faq .index-rail__link:hover {
  background: rgba(30, 67, 89, .55);
  border-left-color: var(--cinnabar);
  color: var(--paper);
}

.page-faq .index-rail__link:focus-visible {
  outline: 2px solid var(--celadon-bright);
  outline-offset: 2px;
}

.page-faq .index-rail__num {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .06em;
  color: var(--amber-bright);
}

.page-faq .faq-rail__foot {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--faq-hair);
}

.page-faq .faq-rail__save {
  width: 100%;
  justify-content: center;
}

/* ---------- 区块骨架 ---------- */
.page-faq .faq-sec {
  padding-bottom: 2.75rem;
  margin-bottom: 2.75rem;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-sec:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

.page-faq .faq-sec__head {
  max-width: 66ch;
  margin-bottom: 1.6rem;
}

.page-faq .faq-sec h2 {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(22px, 2.6vw, 34px);
  line-height: 1.22;
  letter-spacing: -.01em;
  margin: .55rem 0 .7rem;
  color: var(--paper);
}

.page-faq .faq-sec__lede {
  margin: 0;
  color: var(--mist);
  line-height: 1.85;
  font-size: 1rem;
}

/* ---------- 三步自查 ---------- */
.page-faq .check-steps {
  list-style: none;
  margin: 0 0 1.9rem;
  padding: 0;
  display: grid;
  gap: 1.35rem;
}

.page-faq .check-step {
  padding-top: 1.1rem;
  border-top: 2px solid var(--line);
}

.page-faq .check-step__num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(2rem, 6vw, 2.85rem);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--amber);
}

.page-faq .check-step h3 {
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 1.125rem;
  line-height: 1.4;
  margin: .75rem 0 .5rem;
  color: var(--paper);
}

.page-faq .check-step p {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.82;
  color: var(--mist);
}

/* ---------- 图形容器 ---------- */
.page-faq .figure {
  margin: 0 0 1.75rem;
}

.page-faq .figure__media {
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
  background: var(--slate);
}

.page-faq .figure__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-faq .figure__caption {
  margin-top: .65rem;
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .04em;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 状态对照表 ---------- */
.page-faq .faq-matrix {
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
  background: rgba(10, 26, 41, .6);
}

.page-faq .faq-matrix__scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-faq .faq-matrix table {
  width: 100%;
  min-width: 620px;
  border-collapse: collapse;
  font-size: .9375rem;
}

.page-faq .faq-matrix thead th {
  position: sticky;
  top: 0;
  background: rgba(16, 43, 63, .96);
  text-align: left;
  padding: .7rem 1rem;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: .7rem;
  font-weight: 400;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--mist);
  white-space: nowrap;
}

.page-faq .faq-matrix tbody td {
  padding: .68rem 1rem;
  border-bottom: 1px solid var(--faq-hair);
  vertical-align: top;
  line-height: 1.68;
  color: var(--paper-soft);
}

.page-faq .faq-matrix tbody tr:last-child td {
  border-bottom: none;
}

.page-faq .faq-matrix tbody tr:hover td {
  background: rgba(30, 67, 89, .3);
}

.page-faq .faq-matrix__code {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: .78rem;
  letter-spacing: .04em;
  color: var(--amber-bright);
  margin-right: .35rem;
}

.page-faq .faq-matrix__note {
  margin: 1rem 0 0;
  font-size: .875rem;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 状态点（青瓷绿 / 朱砂红成对） ---------- */
.page-faq .state {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .08em;
  white-space: nowrap;
}

.page-faq .state__dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  flex: none;
  display: inline-block;
}

.page-faq .state--ok {
  color: var(--celadon-bright);
}

.page-faq .state--ok .state__dot {
  background: var(--celadon);
}

.page-faq .state--warn {
  color: var(--cinnabar-bright);
}

.page-faq .state--warn .state__dot {
  background: var(--cinnabar-bright);
}

/* ---------- 分类问题折叠 ---------- */
.page-faq .faq-qa-group + .faq-qa-group {
  margin-top: 1.9rem;
}

.page-faq .faq-qa-group__title {
  display: flex;
  align-items: baseline;
  gap: .6rem;
  margin: 0 0 .3rem;
  padding-bottom: .55rem;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-head);
  font-size: 1.0625rem;
  font-weight: 600;
  letter-spacing: .01em;
  color: var(--paper);
}

.page-faq .faq-qa-group__num {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .08em;
  color: var(--cinnabar-bright);
}

.page-faq .qa {
  border-bottom: 1px solid var(--faq-hair);
}

.page-faq .qa__summary {
  display: flex;
  align-items: baseline;
  gap: .75rem;
  padding: .9rem 0;
  cursor: pointer;
  list-style: none;
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.6;
  color: var(--paper-soft);
  transition: color .18s var(--ease);
}

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

.page-faq .qa__summary::after {
  content: "+";
  margin-left: auto;
  flex: none;
  font-family: var(--font-mono);
  font-size: 1.05rem;
  color: var(--amber);
  transition: color .18s var(--ease);
}

.page-faq .qa[open] .qa__summary::after {
  content: "–";
  color: var(--cinnabar-bright);
}

.page-faq .qa__summary:hover {
  color: var(--amber-bright);
}

.page-faq .qa__summary:focus-visible {
  outline: 2px solid var(--celadon-bright);
  outline-offset: 3px;
}

.page-faq .qa__body {
  padding: 0 0 1.15rem;
  font-size: .9375rem;
  line-height: 1.85;
  color: var(--mist);
}

.page-faq .qa__body p {
  margin: 0 0 .55rem;
}

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

.page-faq .qa__body strong {
  color: var(--paper-soft);
  font-weight: 600;
}

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

.page-faq .qa__body a:hover {
  border-bottom-color: var(--amber-bright);
}

/* ---------- 反馈四项 ---------- */
.page-faq .report-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  border-top: 1px solid var(--line);
}

.page-faq .report-item {
  padding: 1.1rem 0;
  border-bottom: 1px solid var(--faq-hair);
}

.page-faq .report-item__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: .74rem;
  letter-spacing: .1em;
  color: var(--amber-bright);
}

.page-faq .report-item h3 {
  font-family: var(--font-head);
  font-size: 1.0625rem;
  font-weight: 600;
  margin: .35rem 0 .4rem;
  color: var(--paper);
}

.page-faq .report-item p {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.8;
  color: var(--mist);
}

.page-faq .faq-contact {
  margin-top: 1.75rem;
  padding: 1.15rem 1.25rem;
  border: 1px solid var(--line);
  border-left: 3px solid var(--cinnabar);
  border-radius: var(--r-sm);
  background: rgba(16, 43, 63, .42);
}

.page-faq .faq-contact__label {
  margin: 0 0 .5rem;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-faq .faq-contact__line {
  margin: 0 0 .6rem;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: .9375rem;
  letter-spacing: .03em;
  color: var(--amber-bright);
  word-break: break-word;
}

.page-faq .faq-contact__note {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.85;
  color: var(--mist);
}

.page-faq .faq-contact__note a {
  color: var(--paper);
  text-decoration: none;
  border-bottom: 1px solid var(--cinnabar);
}

.page-faq .faq-contact__note a:hover {
  color: var(--cinnabar-bright);
}

/* ---------- 版本分支 ---------- */
.page-faq .branch-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

.page-faq .branch {
  padding: 1.2rem 1.3rem 1.35rem;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: rgba(16, 43, 63, .34);
}

.page-faq .branch--main {
  border-top: 3px solid var(--cinnabar);
}

.page-faq .branch--lts {
  border-top: 3px solid var(--celadon);
}

.page-faq .branch__tag {
  margin: 0 0 .55rem;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .12em;
  color: var(--amber-bright);
}

.page-faq .branch h3 {
  font-family: var(--font-head);
  font-size: 1.1875rem;
  font-weight: 600;
  line-height: 1.4;
  margin: 0 0 .85rem;
  color: var(--paper);
}

.page-faq .branch ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: .6rem;
}

.page-faq .branch li {
  position: relative;
  padding-left: 1.1rem;
  font-size: .9375rem;
  line-height: 1.78;
  color: var(--mist);
}

.page-faq .branch li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .68em;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--line);
}

.page-faq .branch--main li::before {
  background: var(--cinnabar-bright);
}

.page-faq .branch--lts li::before {
  background: var(--celadon);
}

.page-faq .faq-rollback {
  margin: 1.5rem 0 0;
  padding-top: 1.25rem;
  border-top: 1px solid var(--faq-hair);
  font-size: .9375rem;
  line-height: 1.85;
  color: var(--mist);
}

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

.page-faq .faq-rollback a:hover {
  border-bottom-color: var(--amber-bright);
}

.page-faq .faq-actions {
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
  margin-top: 1.75rem;
}

/* ---------- 动效 ---------- */
@media (prefers-reduced-motion: no-preference) {
  .page-faq .reveal {
    opacity: 0;
    transform: translateY(12px);
    transition: opacity .5s var(--ease), transform .5s var(--ease);
  }

  .page-faq .reveal.is-visible {
    opacity: 1;
    transform: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .reveal {
    opacity: 1;
    transform: none;
  }
}

/* ---------- 平板 ---------- */
@media (min-width: 640px) {
  .page-faq .wrap {
    padding: 0 1.75rem;
  }

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

  .page-faq .faq-stats__item {
    padding: 1.15rem 0;
    border-bottom: none;
  }

  .page-faq .faq-stats__item + .faq-stats__item {
    padding-left: 1.5rem;
    border-left: 1px solid var(--line);
  }

  .page-faq .check-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.5rem;
  }

  .page-faq .report-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 2rem;
  }

  .page-faq .branch-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.5rem;
  }
}

/* ---------- 桌面：左轴 + 右流 ---------- */
@media (min-width: 960px) {
  .page-faq .wrap {
    padding: 0 2.5rem;
  }

  .page-faq .faq-body {
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
    gap: 3rem;
    align-items: start;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: 5.5rem;
    max-height: calc(100vh - 7rem);
    overflow-y: auto;
  }
}