.page-faq {
  --tree-w: 248px;
  --qa-radius: 14px;
  --qa-pad: 16px;
}

/* ---------- 面包屑 ---------- */
.page-faq .breadcrumb {
  margin: clamp(16px, 2.4vw, 26px) 0 0;
}

/* ---------- 首屏 ---------- */
.page-faq .kb-hero {
  position: relative;
  padding: clamp(18px, 3vw, 30px) 0 clamp(20px, 3.4vw, 32px);
  border-bottom: 1px solid var(--line);
}

.page-faq .kb-hero::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: clamp(64px, 16vw, 180px);
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), transparent);
}

.page-faq .kb-hero h1 {
  margin: 14px 0 0;
  max-width: 34rem;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.85rem, 5.6vw, 3.4rem);
  line-height: 1.14;
  letter-spacing: -.03em;
  color: var(--paper);
}

.page-faq .kb-lede {
  margin: 16px 0 0;
  max-width: 60ch;
  font-size: clamp(.92rem, 1.6vw, 1rem);
  line-height: 1.85;
  color: var(--mist);
}

.page-faq .kb-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 30px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .kb-facts li {
  display: flex;
  align-items: baseline;
  gap: 8px;
  font-size: .8rem;
  letter-spacing: .02em;
  color: var(--mist);
}

.page-faq .kb-facts .mono {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.3rem, 3vw, 1.75rem);
  letter-spacing: -.03em;
  color: var(--cyan);
}

/* ---------- 标签条 ---------- */
.page-faq .kb-tagbar {
  display: flex;
  gap: 8px;
  padding: 18px 0 4px;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-faq .kb-tagbar::-webkit-scrollbar {
  display: none;
}

.page-faq .kb-tag {
  flex: 0 0 auto;
  display: inline-block;
  padding: 7px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: .78rem;
  color: var(--mist);
  text-decoration: none;
  transition: color .18s var(--ease), border-color .18s var(--ease), background .18s var(--ease);
}

.page-faq .kb-tag:hover,
.page-faq .kb-tag:focus-visible {
  color: var(--cyan);
  border-color: rgba(45, 226, 230, .6);
  background: rgba(45, 226, 230, .08);
}

/* ---------- 主栅格 ---------- */
.page-faq .kb-shell {
  display: grid;
  gap: 24px;
  padding: clamp(18px, 3.4vw, 34px) 0 clamp(40px, 7vw, 84px);
}

.page-faq .kb-rail {
  display: none;
}

/* ---------- 章节 ---------- */
.page-faq .kb-section {
  scroll-margin-top: calc(var(--header-h) + 18px);
}

.page-faq .kb-section + .kb-section {
  margin-top: clamp(38px, 6vw, 68px);
}

.page-faq .kb-section-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: baseline;
  gap: 6px 14px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}

.page-faq .kb-section-index {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.1rem, 2.6vw, 1.5rem);
  line-height: 1;
  letter-spacing: -.04em;
  color: var(--cyan);
}

.page-faq .kb-section-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.15rem, 2.6vw, 1.55rem);
  line-height: 1.3;
  letter-spacing: -.02em;
  color: var(--paper);
}

.page-faq .kb-section-note {
  grid-column: 1 / -1;
  margin: 2px 0 0;
  font-size: .87rem;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 配图 ---------- */
.page-faq .kb-figure {
  margin: 16px 0 0;
  border: 1px solid var(--line);
  border-radius: var(--qa-radius);
  overflow: hidden;
  background: var(--ink-2);
}

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

.page-faq .kb-figure figcaption {
  padding: 9px 14px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .04em;
  color: var(--mist);
}

/* ---------- 问答折叠 ---------- */
.page-faq .kb-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 16px;
}

.page-faq .qa {
  background: var(--panel-bg);
  border: 1px solid var(--line);
  border-radius: var(--qa-radius);
  transition: border-color .2s var(--ease);
}

.page-faq .qa[open] {
  border-color: rgba(45, 226, 230, .42);
  background:
    linear-gradient(180deg, rgba(45, 226, 230, .05), transparent 120px),
    var(--panel-bg);
}

.page-faq .qa > summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
  padding: 14px var(--qa-pad);
  cursor: pointer;
  list-style: none;
}

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

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

.page-faq .qa[open] > summary {
  border-bottom: 1px solid var(--line-soft);
}

.page-faq .qa-num {
  font-family: var(--font-mono);
  font-size: .7rem;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--orange);
}

.page-faq .qa-q {
  font-size: clamp(.9rem, 1.6vw, .97rem);
  font-weight: 600;
  line-height: 1.55;
  color: var(--paper);
}

.page-faq .qa-arrow {
  width: 8px;
  height: 8px;
  border-right: 1.5px solid var(--mist);
  border-bottom: 1.5px solid var(--mist);
  transform: rotate(45deg);
  transition: transform .22s var(--ease), border-color .22s var(--ease);
}

.page-faq .qa[open] .qa-arrow {
  transform: rotate(-135deg);
  border-color: var(--cyan);
}

.page-faq .qa-body {
  padding: 14px var(--qa-pad) 18px;
}

.page-faq .qa-body p {
  margin: 0;
  font-size: .89rem;
  line-height: 1.8;
  color: var(--paper);
}

.page-faq .qa-body p + p {
  margin-top: 10px;
}

.page-faq .qa-body a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(45, 226, 230, .38);
}

.page-faq .qa-body a:hover {
  border-bottom-color: var(--cyan);
}

.page-faq .qa-steps {
  display: flex;
  flex-direction: column;
  gap: 9px;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: qastep;
}

.page-faq .qa-steps li {
  position: relative;
  padding-left: 30px;
  font-size: .89rem;
  line-height: 1.75;
  color: var(--paper);
  counter-increment: qastep;
}

.page-faq .qa-steps li::before {
  content: counter(qastep, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 2px;
  padding: 1px 3px;
  border: 1px solid var(--line);
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: .7rem;
  font-weight: 700;
  line-height: 1.2;
  color: var(--cyan);
}

.page-faq .qa-body .qa-steps + p {
  margin-top: 12px;
}

.page-faq .qa-body p.qa-note {
  margin-top: 12px;
  padding-left: 12px;
  border-left: 2px solid var(--orange);
  font-size: .83rem;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 提示卡 ---------- */
.page-faq .kb-tip {
  margin-top: 16px;
  padding: 14px 18px;
  border: 1px solid rgba(255, 122, 61, .38);
  border-radius: 0 var(--qa-radius) 0 var(--qa-radius);
  background: rgba(255, 122, 61, .09);
  font-size: .85rem;
  line-height: 1.75;
  color: var(--paper);
}

/* ---------- 收口 ---------- */
.page-faq .kb-more {
  margin-top: clamp(38px, 6vw, 68px);
  padding: clamp(20px, 3.6vw, 34px);
  border: 1px solid var(--line);
  border-radius: 18px;
  background:
    linear-gradient(135deg, rgba(45, 226, 230, .10), transparent 62%),
    var(--ink-2);
}

.page-faq .kb-more h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.15rem, 2.6vw, 1.5rem);
  letter-spacing: -.02em;
  color: var(--paper);
}

.page-faq .kb-more p {
  margin: 10px 0 0;
  max-width: 58ch;
  font-size: .9rem;
  line-height: 1.8;
  color: var(--mist);
}

.page-faq .kb-more-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

/* ---------- 窄屏 ---------- */
@media (max-width: 599px) {
  .page-faq .qa > summary {
    gap: 10px;
    padding: 13px 13px;
  }

  .page-faq .qa-body {
    padding: 13px 13px 16px;
  }

  .page-faq .kb-facts {
    gap: 10px 22px;
  }

  .page-faq .kb-facts li {
    font-size: .74rem;
  }

  .page-faq .qa-steps li {
    padding-left: 28px;
  }
}

/* ---------- 桌面：左侧目录树固定跟随 ---------- */
@media (min-width: 940px) {
  .page-faq .kb-shell {
    grid-template-columns: var(--tree-w) minmax(0, 1fr);
    gap: clamp(32px, 4.4vw, 64px);
    align-items: start;
  }

  .page-faq .kb-rail {
    display: block;
    position: sticky;
    top: calc(var(--header-h) + 16px);
    max-height: calc(100vh - var(--header-h) - 40px);
    overflow-y: auto;
  }

  .page-faq .kb-rail-head {
    margin: 0 0 12px;
    font-family: var(--font-mono);
    font-size: .7rem;
    letter-spacing: .18em;
    text-transform: uppercase;
    color: var(--mist);
  }

  .page-faq .kb-tree {
    display: flex;
    flex-direction: column;
    border-left: 1px solid var(--line);
  }

  .page-faq .kb-tree-link {
    display: grid;
    grid-template-columns: 24px minmax(0, 1fr) auto;
    align-items: center;
    gap: 10px;
    margin-left: -1px;
    padding: 9px 8px 9px 14px;
    border-left: 2px solid transparent;
    color: var(--mist);
    font-size: .86rem;
    text-decoration: none;
    transition: color .18s var(--ease), background .18s var(--ease), border-color .18s var(--ease);
  }

  .page-faq .kb-tree-link:hover {
    color: var(--paper);
    background: rgba(45, 226, 230, .07);
  }

  .page-faq .kb-tree-link[aria-current="true"] {
    color: var(--cyan);
    border-left-color: var(--cyan);
    background: rgba(45, 226, 230, .09);
  }

  .page-faq .kb-tree-num {
    font-family: var(--font-mono);
    font-size: .7rem;
    font-weight: 700;
    color: var(--orange);
  }

  .page-faq .kb-tree-count {
    font-family: var(--font-mono);
    font-size: .68rem;
    color: var(--mist);
    opacity: .55;
  }
}

/* ---------- 降低动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-faq .qa,
  .page-faq .qa-arrow,
  .page-faq .kb-tag,
  .page-faq .kb-tree-link {
    transition: none;
  }

  .page-faq .qa-arrow {
    transform: rotate(45deg);
  }

  .page-faq .qa[open] .qa-arrow {
    transform: rotate(-135deg);
  }
}
<<<END>>>