.page-faq {
  --faq-side-w: clamp(216px, 23vw, 296px);
  --faq-colgap: clamp(28px, 4vw, 64px);
  --faq-numcol: 2.7em;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding-top: clamp(20px, 3vw, 40px);
  padding-bottom: clamp(36px, 5vw, 72px);
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  right: -12%;
  top: 22%;
  width: 52%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--k-cyan));
  transform: rotate(-6deg);
  pointer-events: none;
  opacity: .75;
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: clamp(60px, 12vw, 180px);
  height: 3px;
  background: var(--k-signal);
  transform: skewX(-6deg);
  pointer-events: none;
}

.page-faq .faq-hero__body {
  padding-top: clamp(22px, 3.6vw, 52px);
  display: grid;
  gap: clamp(16px, 2vw, 26px);
}

.page-faq .faq-hero__title {
  margin: 0;
  font-family: var(--k-font-display);
  font-weight: 300;
  font-size: clamp(2.3rem, 7.4vw, 5.6rem);
  line-height: .98;
  letter-spacing: -.035em;
  color: var(--k-chalk);
  max-width: 14ch;
}

.page-faq .faq-hero__foot {
  display: grid;
  gap: clamp(18px, 2.4vw, 30px);
  align-items: start;
}

.page-faq .faq-hero__lead {
  margin: 0;
  max-width: 48ch;
  color: var(--k-gray);
  font-size: clamp(.95rem, 1.25vw, 1.06rem);
  line-height: 1.78;
}

.page-faq .faq-hero__acts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 主体布局 ---------- */
.page-faq .faq-board {
  padding-top: clamp(20px, 3vw, 40px);
}

.page-faq .faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(30px, 4.5vw, 56px);
  align-items: start;
}

/* ---------- 左侧问题索引 ---------- */
.page-faq .faq-side__cap {
  margin: 0 0 14px;
  padding-bottom: 10px;
  font-family: var(--k-font-mono);
  font-size: 11px;
  letter-spacing: .24em;
  text-transform: uppercase;
  color: var(--k-cyan);
  border-bottom: 1px solid var(--k-line);
}

.page-faq .faq-side__list,
.page-faq .faq-side__sub {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-faq .faq-side__group + .faq-side__group {
  margin-top: 18px;
}

.page-faq .faq-side__grouphead {
  display: block;
  padding: 6px 0 7px;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: .01em;
  color: var(--k-chalk);
  text-decoration: none;
  border-bottom: 1px solid var(--k-line);
  transition: color .18s var(--k-ease);
}

.page-faq .faq-side__grouphead:hover {
  color: var(--k-signal);
}

.page-faq .faq-side__link {
  display: flex;
  align-items: baseline;
  gap: 9px;
  padding: 6px 0 6px 2px;
  font-size: 12.5px;
  line-height: 1.4;
  color: var(--k-gray);
  text-decoration: none;
  border-bottom: 1px dashed rgba(35, 57, 78, .85);
  transition: color .18s var(--k-ease);
}

.page-faq .faq-side__link:hover {
  color: var(--k-amber);
}

.page-faq .faq-side__num {
  flex: none;
  font-family: var(--k-font-mono);
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--k-signal);
}

/* ---------- 分组 ---------- */
.page-faq .faq-group {
  padding-top: clamp(20px, 3vw, 34px);
  border-top: 1px solid var(--k-line);
  scroll-margin-top: calc(var(--k-topbar-h) + 24px);
}

.page-faq .faq-group + .faq-group {
  margin-top: clamp(42px, 6vw, 84px);
}

.page-faq .faq-group__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: clamp(14px, 2.2vw, 30px);
  align-items: start;
  margin-bottom: clamp(14px, 2.2vw, 26px);
}

.page-faq .faq-group__num {
  font-family: var(--k-font-mono);
  font-weight: 700;
  font-size: clamp(30px, 4.6vw, 60px);
  line-height: .88;
  letter-spacing: -.05em;
  color: var(--k-signal);
}

.page-faq .faq-group__eyebrow {
  margin: 0 0 8px;
  font-family: var(--k-font-mono);
  font-size: 11px;
  letter-spacing: .24em;
  text-transform: uppercase;
  color: var(--k-cyan);
}

.page-faq .faq-group__title {
  margin: 0;
  max-width: 24ch;
  font-family: var(--k-font-display);
  font-weight: 400;
  font-size: clamp(1.45rem, 3.2vw, 2.5rem);
  line-height: 1.12;
  letter-spacing: -.022em;
  color: var(--k-chalk);
}

/* ---------- 问答条目 ---------- */
.page-faq .faq-item {
  border-bottom: 1px solid var(--k-line);
  transition: background-color .18s var(--k-ease);
}

.page-faq .faq-item:hover {
  background-color: rgba(244, 247, 249, .035);
}

.page-faq .faq-item:target {
  background-color: rgba(255, 74, 23, .08);
  box-shadow: inset 3px 0 0 var(--k-signal);
}

.page-faq .faq-q {
  margin: 0;
}

.page-faq .faq-q__btn {
  display: grid;
  grid-template-columns: var(--faq-numcol) minmax(0, 1fr);
  column-gap: clamp(10px, 1.8vw, 22px);
  align-items: start;
  width: 100%;
  padding: clamp(16px, 2.1vw, 24px) 0;
  margin: 0;
  border: 0;
  background: none;
  text-align: left;
  cursor: pointer;
  color: inherit;
  font: inherit;
}

.page-faq .faq-q__num {
  font-family: var(--k-font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .06em;
  line-height: 1.9;
  color: var(--k-signal);
}

.page-faq .faq-q__text {
  font-size: clamp(1.02rem, 1.7vw, 1.42rem);
  font-weight: 400;
  line-height: 1.42;
  letter-spacing: -.012em;
  color: var(--k-chalk);
  transition: color .18s var(--k-ease);
}

.page-faq .faq-q__btn:hover .faq-q__text {
  color: var(--k-signal);
}

.page-faq .faq-a {
  display: grid;
  grid-template-columns: var(--faq-numcol) minmax(0, 1fr);
  column-gap: clamp(10px, 1.8vw, 22px);
  padding-bottom: clamp(16px, 2.2vw, 26px);
}

.page-faq .faq-a[hidden] {
  display: none;
}

.page-faq .faq-a p {
  margin: 0;
  max-width: 42em;
  font-size: clamp(.92rem, 1.05vw, 1rem);
  line-height: 1.78;
  color: var(--k-gray);
}

.page-faq .faq-a a {
  color: var(--k-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(23, 227, 210, .45);
  transition: color .18s var(--k-ease), border-color .18s var(--k-ease);
}

.page-faq .faq-a a:hover {
  color: var(--k-signal);
  border-bottom-color: var(--k-signal);
}

/* ---------- 配图 ---------- */
.page-faq .faq-figure {
  margin: clamp(24px, 3.4vw, 42px) 0;
  padding-left: clamp(0px, 3.2vw, 52px);
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--k-line);
}

.page-faq .faq-figure figcaption {
  margin-top: 10px;
  font-family: var(--k-font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  line-height: 1.6;
  color: var(--k-gray);
}

/* ---------- 收尾 ---------- */
.page-faq .faq-tail {
  display: grid;
  gap: 18px;
  margin-top: clamp(24px, 3.4vw, 40px);
  padding: clamp(20px, 2.8vw, 30px) clamp(20px, 2.8vw, 34px);
  border: 1px solid var(--k-line);
  background: var(--k-night-2);
  border-left: 3px solid var(--k-amber);
}

.page-faq .faq-tail__text {
  display: grid;
  gap: 6px;
}

.page-faq .faq-tail__title {
  margin: 0;
  font-family: var(--k-font-mono);
  font-size: clamp(13px, 1.5vw, 16px);
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--k-chalk);
  word-break: break-all;
}

.page-faq .faq-tail__sub {
  margin: 0;
  font-family: var(--k-font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--k-gray);
}

.page-faq .faq-tail .k-btn {
  justify-self: start;
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-faq .faq-hero__foot {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
  }
  .page-faq .faq-hero__acts {
    justify-content: flex-end;
  }
}

@media (min-width: 1024px) {
  .page-faq .faq-layout {
    grid-template-columns: var(--faq-side-w) minmax(0, 1fr);
    column-gap: var(--faq-colgap);
  }

  .page-faq .faq-side {
    position: sticky;
    top: calc(var(--k-topbar-h) + 20px);
    max-height: calc(100vh - var(--k-topbar-h) - 40px);
    overflow-y: auto;
    padding-right: 6px;
  }

  .page-faq .faq-side::-webkit-scrollbar {
    width: 4px;
  }

  .page-faq .faq-side::-webkit-scrollbar-thumb {
    background: var(--k-line);
  }

  .page-faq .faq-hero__title {
    max-width: 12ch;
  }
}

@media (max-width: 480px) {
  .page-faq {
    --faq-numcol: 2.1em;
  }

  .page-faq .faq-group__num {
    font-size: 26px;
  }

  .page-faq .faq-figure {
    padding-left: 0;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item,
  .page-faq .faq-q__text,
  .page-faq .faq-side__link,
  .page-faq .faq-side__grouphead,
  .page-faq .faq-a a {
    transition: none;
  }
}