.page-faq {
  --faq-tree-w: 232px;
  --faq-gap: clamp(20px, 3.2vw, 44px);
  --faq-sticky: 128px;
  position: relative;
  padding-bottom: clamp(56px, 9vw, 104px);
  color: var(--text);
  background-image:
    linear-gradient(to right, rgba(79, 216, 224, 0.04) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(79, 216, 224, 0.04) 1px, transparent 1px);
  background-size: 56px 56px;
}

/* ---------- 面包屑 ---------- */
.page-faq .breadcrumb {
  padding-top: 14px;
}

.page-faq .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.02em;
}

.page-faq .breadcrumb__item {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
}

.page-faq .breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  color: var(--track);
}

.page-faq .breadcrumb__link {
  color: var(--muted);
  text-decoration: none;
  transition: color var(--ease);
}

.page-faq .breadcrumb__link:hover,
.page-faq .breadcrumb__link:focus-visible {
  color: var(--lime);
}

.page-faq .breadcrumb__current {
  color: var(--text);
}

/* ---------- 首屏声明 ---------- */
.page-faq .kb-hero {
  position: relative;
  display: grid;
  gap: 16px;
  padding: clamp(24px, 4vw, 40px) 0 clamp(28px, 4.5vw, 46px);
  border-bottom: 1px solid var(--track);
}

.page-faq .kb-hero::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: clamp(88px, 18vw, 190px);
  height: 3px;
  background: var(--lime);
  transform: skewX(-28deg);
  transform-origin: left bottom;
}

.page-faq .kb-hero__title {
  margin: 0;
  max-width: 16em;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(30px, 6.4vw, 54px);
  line-height: 1.14;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-faq .kb-hero__lede {
  margin: 0;
  max-width: 42em;
  font-size: clamp(15px, 2.4vw, 17px);
  line-height: 1.78;
  color: var(--muted);
}

.page-faq .kb-hero__stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin-top: 4px;
}

.page-faq .kb-stat {
  display: grid;
  gap: 2px;
  padding: 12px 12px 14px;
  background: var(--panel);
  border-top: 2px solid var(--track);
}

.page-faq .kb-stat:nth-child(1) { border-top-color: var(--lime); }
.page-faq .kb-stat:nth-child(2) { border-top-color: var(--cyan); }
.page-faq .kb-stat:nth-child(3) { border-top-color: var(--amber); }

.page-faq .kb-stat__v {
  font-size: clamp(20px, 4vw, 28px);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--text);
  line-height: 1.1;
}

.page-faq .kb-stat__u {
  margin-left: 3px;
  font-size: 12px;
  font-weight: 500;
  color: var(--muted);
}

.page-faq .kb-stat__l {
  font-size: 12.5px;
  color: var(--muted);
}

.page-faq .kb-hero__tip {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--muted);
}

.page-faq .kb-hero__tip a {
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid rgba(182, 255, 59, 0.4);
}

.page-faq .kb-hero__tip a:hover,
.page-faq .kb-hero__tip a:focus-visible {
  color: var(--text);
  border-bottom-color: var(--text);
}

/* ---------- 四分类目录 ---------- */
.page-faq .kb-index {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  padding: clamp(22px, 3.5vw, 36px) 0 clamp(6px, 1.5vw, 12px);
}

.page-faq .kb-index__item {
  display: grid;
  gap: 5px;
  padding: 16px 16px 18px;
  background: var(--panel);
  border: 1px solid transparent;
  border-top: 3px solid var(--track);
  text-decoration: none;
  color: var(--text);
  transition: background var(--ease), border-color var(--ease), transform var(--ease);
}

.page-faq .kb-index__item:hover,
.page-faq .kb-index__item:focus-visible {
  background: var(--panel-deep);
  border-color: var(--lime);
  transform: translateY(-2px);
}

.page-faq .kb-index__num {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--lime);
}

.page-faq .kb-index__name {
  font-weight: 800;
  font-size: 17px;
  letter-spacing: -0.01em;
}

.page-faq .kb-index__desc {
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

.page-faq .kb-index__count {
  margin-top: 4px;
  font-size: 12px;
  color: var(--cyan);
}

/* ---------- 主体布局：左分类树 + 右问答 ---------- */
.page-faq .kb-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--faq-gap);
  padding-top: clamp(24px, 4vw, 42px);
}

.page-faq .kb-tree {
  display: grid;
  gap: 12px;
  align-content: start;
}

.page-faq .kb-tree__title {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-faq .kb-tree__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 4px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-faq .kb-tree__item {
  flex: 0 0 auto;
}

.page-faq .kb-tree__link {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 14px;
  font-size: 14px;
  font-weight: 700;
  white-space: nowrap;
  text-decoration: none;
  color: var(--text);
  background: var(--panel);
  border-left: 3px solid var(--track);
  transition: background var(--ease), border-color var(--ease), color var(--ease);
}

.page-faq .kb-tree__link:hover,
.page-faq .kb-tree__link:focus-visible {
  border-left-color: var(--lime);
  color: var(--lime);
  background: var(--panel-deep);
}

.page-faq .kb-tree__num {
  font-size: 11.5px;
  color: var(--muted);
}

.page-faq .kb-tree__link:hover .kb-tree__num,
.page-faq .kb-tree__link:focus-visible .kb-tree__num {
  color: var(--lime);
}

.page-faq .kb-tree__foot {
  margin: 0;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--muted);
}

.page-faq .kb-tree__foot a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(79, 216, 224, 0.4);
}

.page-faq .kb-tree__foot a:hover,
.page-faq .kb-tree__foot a:focus-visible {
  color: var(--text);
  border-bottom-color: var(--text);
}

/* ---------- 分组 ---------- */
.page-faq .kb-main {
  min-width: 0;
}

.page-faq .kb-group {
  scroll-margin-top: var(--faq-sticky);
}

.page-faq .kb-group + .kb-group {
  margin-top: clamp(32px, 5vw, 56px);
}

.page-faq .kb-group + .kb-group::before {
  content: "";
  display: block;
  height: 1px;
  margin-bottom: clamp(26px, 4vw, 42px);
  background: linear-gradient(90deg, var(--lime) 0 36px, var(--track) 36px 100%);
}

.page-faq .kb-group__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 14px;
}

.page-faq .kb-group__num {
  font-size: 12.5px;
  letter-spacing: 0.1em;
  color: var(--lime);
}

.page-faq .kb-group__title {
  margin: 0;
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: clamp(20px, 3.2vw, 27px);
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-faq .kb-group__meta {
  margin-left: auto;
  font-size: 12px;
  color: var(--muted);
}

.page-faq .kb-group__intro {
  margin: 10px 0 18px;
  max-width: 46em;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 折叠问答 ---------- */
.page-faq .kb-qa {
  margin-top: 10px;
  background: var(--panel);
  border-left: 3px solid var(--track);
  transition: background var(--ease), border-color var(--ease);
}

.page-faq .kb-qa:hover,
.page-faq .kb-qa:focus-within {
  border-left-color: var(--lime);
}

.page-faq .kb-qa[open] {
  background: var(--panel-deep);
  border-left-color: var(--lime);
}

.page-faq .kb-qa__q {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 14px clamp(14px, 3vw, 20px);
  cursor: pointer;
  list-style: none;
  font-size: clamp(15px, 2.4vw, 16px);
  font-weight: 700;
  line-height: 1.55;
  color: var(--text);
}

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

.page-faq .kb-qa__q::before {
  content: "+";
  flex: 0 0 18px;
  width: 18px;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.35;
  color: var(--lime);
}

.page-faq .kb-qa[open] .kb-qa__q::before {
  content: "\2212";
}

.page-faq .kb-qa__body {
  padding: 0 clamp(14px, 3vw, 20px) clamp(16px, 3vw, 22px);
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--muted);
}

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

.page-faq .kb-qa__body a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(79, 216, 224, 0.4);
}

.page-faq .kb-qa__body a:hover,
.page-faq .kb-qa__body a:focus-visible {
  color: var(--text);
  border-bottom-color: var(--text);
}

/* ---------- 步骤 ---------- */
.page-faq .kb-steps {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .kb-step {
  display: grid;
  grid-template-columns: 24px minmax(0, 1fr);
  gap: 10px;
  align-items: start;
}

.page-faq .kb-step__n {
  display: grid;
  place-items: center;
  width: 22px;
  height: 22px;
  margin-top: 2px;
  font-size: 12px;
  font-weight: 700;
  color: var(--ink);
  background: var(--lime);
  clip-path: polygon(0 0, 100% 0, 100% 72%, 72% 100%, 0 100%);
}

.page-faq .kb-step__t {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--text);
}

.page-faq .kb-note {
  margin: 12px 0 0;
  padding: 10px 14px;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--text);
  background: rgba(255, 122, 41, 0.09);
  border-left: 2px solid var(--amber);
}

/* ---------- 图片 ---------- */
.page-faq .kb-figure {
  margin: 18px 0 4px;
  max-width: 100%;
}

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

/* ---------- 终端色块 ---------- */
.page-faq .kb-terms {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .kb-term {
  display: grid;
  gap: 4px;
  padding: 14px 14px 16px;
  background: var(--panel);
  border-top: 2px solid var(--cyan);
}

.page-faq .kb-term:nth-child(2) { border-top-color: var(--lime); }
.page-faq .kb-term:nth-child(3) { border-top-color: var(--amber); }
.page-faq .kb-term:nth-child(4) { border-top-color: var(--track); }

.page-faq .kb-term__ico {
  color: var(--cyan);
}

.page-faq .kb-term:nth-child(2) .kb-term__ico { color: var(--lime); }
.page-faq .kb-term:nth-child(3) .kb-term__ico { color: var(--amber); }
.page-faq .kb-term:nth-child(4) .kb-term__ico { color: var(--muted); }

.page-faq .kb-term__name {
  font-size: 15px;
  font-weight: 700;
  color: var(--text);
}

.page-faq .kb-term__spec {
  font-size: 12.5px;
  color: var(--muted);
}

/* ---------- 设备对照表 ---------- */
.page-faq .kb-table-wrap {
  margin-top: 16px;
  overflow-x: auto;
  background: var(--panel-deep);
  border: 1px solid var(--track);
}

.page-faq .kb-device {
  width: 100%;
  min-width: 520px;
  border-collapse: collapse;
}

.page-faq .kb-device caption {
  caption-side: top;
  padding: 12px 14px;
  text-align: left;
  font-size: 12.5px;
  color: var(--muted);
  border-bottom: 1px solid var(--track);
}

.page-faq .kb-device th,
.page-faq .kb-device td {
  padding: 10px 14px;
  text-align: left;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.01em;
  white-space: nowrap;
  border-bottom: 1px solid rgba(20, 64, 107, 0.75);
}

.page-faq .kb-device thead th {
  font-size: 12px;
  font-weight: 500;
  color: var(--muted);
  background: var(--track);
}

.page-faq .kb-device tbody th {
  font-weight: 700;
  color: var(--lime);
}

.page-faq .kb-device tbody td {
  color: var(--text);
}

.page-faq .kb-device tbody tr:nth-child(odd) {
  background: rgba(20, 64, 107, 0.28);
}

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

/* ---------- 兜底联系区 ---------- */
.page-faq .kb-help {
  margin-top: clamp(34px, 5vw, 58px);
  padding: clamp(24px, 4vw, 42px) clamp(18px, 4vw, 40px);
  background: linear-gradient(140deg, rgba(20, 64, 107, 0.55) 0%, rgba(10, 30, 51, 0.92) 100%);
  border-left: 4px solid var(--lime);
}

.page-faq .kb-help__text {
  margin: 14px 0 0;
  max-width: 44em;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--text);
}

.page-faq .kb-help__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 560px) {
  .page-faq .kb-index {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-faq .kb-terms {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 960px) {
  .page-faq .kb-layout {
    grid-template-columns: var(--faq-tree-w) minmax(0, 1fr);
    align-items: start;
  }

  .page-faq .kb-tree {
    position: sticky;
    top: var(--faq-sticky);
    padding-left: 16px;
    border-left: 2px solid var(--track);
  }

  .page-faq .kb-tree__list {
    flex-direction: column;
    gap: 6px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-faq .kb-tree__item {
    flex: 1 1 auto;
  }

  .page-faq .kb-tree__link {
    width: 100%;
    padding: 10px 12px;
    background: transparent;
  }
}

@media (min-width: 1024px) {
  .page-faq .kb-index {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 1120px) {
  .page-faq .kb-hero {
    grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
    grid-template-areas:
      "eyebrow eyebrow"
      "title   stats"
      "lede    stats"
      "tip     stats";
    align-items: start;
    column-gap: clamp(24px, 4vw, 56px);
    row-gap: 14px;
  }

  .page-faq .kb-hero .eyebrow { grid-area: eyebrow; }
  .page-faq .kb-hero__title { grid-area: title; }
  .page-faq .kb-hero__lede { grid-area: lede; max-width: 34em; }
  .page-faq .kb-hero__tip { grid-area: tip; }

  .page-faq .kb-hero__stats {
    grid-area: stats;
    grid-template-columns: 1fr;
    margin-top: 6px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .kb-index__item,
  .page-faq .kb-tree__link,
  .page-faq .kb-qa {
    transition: none;
  }

  .page-faq .kb-index__item:hover,
  .page-faq .kb-index__item:focus-visible {
    transform: none;
  }
}