.page-faq {
  --faq-rail-w: 236px;
  --faq-gap: clamp(20px, 3vw, 40px);
  position: relative;
  padding-bottom: clamp(48px, 8vw, 96px);
}

/* ---------- 面包屑 ---------- */
.page-faq .faq-crumbs {
  padding-top: clamp(18px, 3vw, 32px);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--faq-gap);
  padding-block: clamp(22px, 4vw, 44px) clamp(30px, 5vw, 52px);
  border-bottom: var(--line);
}

@media (min-width: 900px) {
  .page-faq .faq-hero {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: end;
  }
}

.page-faq .faq-hero__title {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(2.1rem, 6vw, 4.4rem);
  line-height: 1.02;
  letter-spacing: -0.02em;
  color: var(--c-mist);
  margin: 0.18em 0 0.42em;
  max-width: 18ch;
}

.page-faq .faq-hero__text .lede {
  max-width: 56ch;
  color: var(--c-steel);
  line-height: 1.8;
}

.page-faq .faq-hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 18px 34px;
  margin-top: 30px;
  padding-top: 18px;
  border-top: var(--line);
}

.page-faq .faq-hero__stats .stat {
  min-width: 0;
}

.page-faq .faq-hero__stats .stat__value {
  font-family: var(--font-mono);
  font-size: clamp(1.6rem, 3vw, 2.1rem);
  line-height: 1;
  color: var(--c-lime);
  font-weight: 400;
}

.page-faq .faq-hero__stats .stat__unit {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--c-gray);
  margin-left: 4px;
}

.page-faq .faq-hero__stats .stat__label {
  display: block;
  margin-top: 7px;
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--c-steel);
}

/* ---------- 图片 ---------- */
.page-faq .faq-shot {
  margin: 0;
  min-width: 0;
}

.page-faq .faq-shot .media__frame {
  aspect-ratio: 14 / 9;
  overflow: hidden;
  border: var(--line-strong);
  background:
    linear-gradient(rgba(155, 201, 194, 0.09) 1px, transparent 1px) 0 0 / 100% 28px,
    linear-gradient(90deg, rgba(155, 201, 194, 0.09) 1px, transparent 1px) 0 0 / 28px 100%,
    var(--c-deep);
}

.page-faq .faq-shot--band .media__frame {
  aspect-ratio: 3 / 2;
}

.page-faq .faq-shot .media__img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
}

.page-faq .faq-shot .media__cap {
  margin-top: 10px;
  font-size: 0.74rem;
  line-height: 1.6;
  color: var(--c-gray);
}

/* ---------- 筛选条 ---------- */
.page-faq .faq-board {
  margin-top: clamp(26px, 4vw, 44px);
}

.page-faq .faq-bar {
  position: sticky;
  top: var(--topbar-h);
  z-index: 8;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 22px;
  padding: 14px 0;
  background: var(--c-ink);
  border-bottom: var(--line);
}

.page-faq .filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-faq .filter-btn {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.06em;
  padding: 7px 14px;
  border: var(--line);
  background: transparent;
  color: var(--c-steel);
  cursor: pointer;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease), background 0.18s var(--ease);
}

.page-faq .filter-btn:hover {
  color: var(--c-mist);
  border-color: rgba(233, 241, 236, 0.34);
}

.page-faq .filter-btn.is-on {
  background: var(--c-lime);
  border-color: var(--c-lime);
  color: var(--c-ink);
}

.page-faq .faq-bar__count {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.04em;
  color: var(--c-gray);
}

.page-faq .faq-bar__count .num {
  font-size: 1rem;
  color: var(--c-lime);
}

/* ---------- 双栏骨架 ---------- */
.page-faq .faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 52px);
  margin-top: clamp(26px, 4vw, 44px);
}

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

/* ---------- 左侧索引轨道 ---------- */
.page-faq .faq-rail {
  min-width: 0;
  border-top: 2px solid var(--c-lime);
  padding-top: 16px;
}

@media (min-width: 960px) {
  .page-faq .faq-rail {
    position: sticky;
    top: calc(var(--topbar-h) + 84px);
    align-self: start;
  }
}

.page-faq .faq-rail__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  color: var(--c-gray);
}

.page-faq .faq-index {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-faq .faq-index a {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 10px;
  padding: 9px 10px 9px 8px;
  border-left: 2px solid transparent;
  color: var(--c-mist);
  text-decoration: none;
  font-size: 0.88rem;
  line-height: 1.4;
  transition: border-color 0.18s var(--ease), background-color 0.18s var(--ease), color 0.18s var(--ease);
}

.page-faq .faq-index a:hover,
.page-faq .faq-index a:focus-visible {
  border-left-color: var(--c-lime);
  background: rgba(200, 255, 61, 0.07);
  color: var(--c-lime);
}

.page-faq .faq-index__no {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--c-lime);
}

.page-faq .faq-index__n {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--c-gray);
}

.page-faq .faq-rail__note {
  margin-top: 16px;
  font-size: 0.73rem;
  line-height: 1.7;
}

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

.page-faq .faq-group + .faq-group {
  margin-top: clamp(38px, 5vw, 68px);
}

.page-faq .faq-group__head {
  border-top: var(--line-strong);
  padding-top: 18px;
  margin-bottom: 6px;
}

.page-faq .faq-group__head .section-title--sm {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(1.45rem, 3.2vw, 2.15rem);
  line-height: 1.12;
  letter-spacing: -0.01em;
  color: var(--c-mist);
  margin: 0.14em 0 0.5em;
}

.page-faq .faq-group__lede {
  margin: 0;
  max-width: 62ch;
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--c-steel);
}

.page-faq .faq-group--contact .faq-group__head {
  border-top-color: rgba(255, 179, 64, 0.6);
}

.page-faq .faq-group--version .faq-group__head {
  border-top-color: rgba(127, 155, 179, 0.6);
}

/* ---------- 时间轴小图 ---------- */
.page-faq .faq-timeline {
  display: block;
  width: 100%;
  max-width: 420px;
  height: auto;
  margin: 20px 0 4px;
  opacity: 0.92;
}

/* ---------- 折叠问答 ---------- */
.page-faq .qa {
  border-top: var(--line);
  border-left: 3px solid transparent;
  transition: border-color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.page-faq .qa:last-of-type {
  border-bottom: var(--line);
}

.page-faq .qa[open] {
  border-left-color: var(--c-lime);
  background: rgba(200, 255, 61, 0.035);
}

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

.page-faq .qa__q {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: baseline;
  gap: 14px;
  padding: 20px 10px 20px 12px;
  list-style: none;
  cursor: pointer;
  color: var(--c-mist);
  font-size: 1rem;
  line-height: 1.55;
  transition: color 0.18s var(--ease);
}

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

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

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

.page-faq .qa__no {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  color: var(--c-gray);
  transition: color 0.18s var(--ease);
}

.page-faq .qa[open] .qa__no {
  color: var(--c-lime);
}

.page-faq .qa__label {
  min-width: 0;
  overflow-wrap: anywhere;
}

.page-faq .qa__icon {
  position: relative;
  display: block;
  width: 14px;
  height: 14px;
  align-self: center;
  flex: none;
}

.page-faq .qa__icon::before,
.page-faq .qa__icon::after {
  content: "";
  position: absolute;
  background: var(--c-gray);
  transition: transform 0.2s var(--ease), opacity 0.2s var(--ease), background-color 0.2s var(--ease);
}

.page-faq .qa__icon::before {
  left: 0;
  top: 6px;
  width: 14px;
  height: 2px;
}

.page-faq .qa__icon::after {
  left: 6px;
  top: 0;
  width: 2px;
  height: 14px;
}

.page-faq .qa[open] .qa__icon::before {
  background: var(--c-lime);
}

.page-faq .qa[open] .qa__icon::after {
  transform: scaleY(0);
  opacity: 0;
}

.page-faq .qa__body {
  padding: 0 16px 26px 12px;
}

.page-faq .qa__body p {
  margin: 0 0 12px;
  max-width: 68ch;
  font-size: 0.94rem;
  line-height: 1.85;
  color: var(--c-steel);
}

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

.page-faq .qa__body a {
  color: var(--c-teal);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color 0.18s var(--ease);
}

.page-faq .qa__body a:hover {
  color: var(--c-lime);
}

.page-faq .qa__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px dashed rgba(233, 241, 236, 0.14);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.04em;
  color: var(--c-gray);
}

.page-faq .qa__meta span {
  position: relative;
  padding-left: 12px;
}

.page-faq .qa__meta span::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.45em;
  width: 5px;
  height: 5px;
  background: var(--c-amber);
}

.page-faq .faq-group--contact .qa__meta span::before {
  background: var(--c-amber);
}

.page-faq .faq-group--version .qa__meta span::before {
  background: var(--c-steel);
}

/* ---------- 结尾区块 ---------- */
.page-faq .faq-outro {
  margin-top: clamp(48px, 7vw, 88px);
  padding: clamp(24px, 4vw, 42px);
  border: var(--line-strong);
  background:
    radial-gradient(120% 150% at 100% 0%, rgba(200, 255, 61, 0.1), transparent 58%),
    var(--c-coal);
  box-shadow: var(--shadow-brut);
}

.page-faq .faq-outro .section-title--sm {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(1.5rem, 3.4vw, 2.3rem);
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--c-mist);
  margin: 0.12em 0 0.5em;
}

.page-faq .faq-outro__text {
  margin: 0;
  max-width: 66ch;
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--c-steel);
}

.page-faq .faq-outro__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-faq .faq-outro__note {
  margin: 24px 0 0;
  padding-top: 16px;
  border-top: var(--line);
  font-size: 0.73rem;
  line-height: 1.7;
}

/* ---------- 窄屏收敛 ---------- */
@media (max-width: 640px) {
  .page-faq .faq-bar {
    position: static;
  }

  .page-faq .faq-index {
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  }

  .page-faq .qa__q {
    gap: 10px;
    padding: 18px 8px 18px 10px;
  }

  .page-faq .qa__body {
    padding: 0 8px 24px 10px;
  }

  .page-faq .faq-outro {
    box-shadow: 4px 4px 0 rgba(0, 0, 0, 0.5);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .filter-btn,
  .page-faq .qa,
  .page-faq .qa__q,
  .page-faq .qa__no,
  .page-faq .qa__icon::before,
  .page-faq .qa__icon::after,
  .page-faq .faq-index a {
    transition: none;
  }
}