.page-faq {
  --faq-line: rgba(142, 134, 240, .20);
  --faq-line-quiet: rgba(142, 134, 240, .11);
  --faq-gold-line: rgba(217, 164, 65, .6);
  position: relative;
  background:
    radial-gradient(120% 56% at 10% 0%, rgba(75, 63, 191, .30), transparent 62%),
    radial-gradient(80% 40% at 96% 24%, rgba(63, 224, 200, .06), transparent 70%),
    var(--void);
  color: var(--text-1);
  padding-bottom: clamp(56px, 9vh, 112px);
  overflow: hidden;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-mast {
  position: relative;
  padding: clamp(84px, 13vh, 152px) 0 clamp(32px, 5vh, 56px);
}

.page-faq .faq-mast::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--faq-line-quiet) 1px, transparent 1px),
    linear-gradient(90deg, var(--faq-line-quiet) 1px, transparent 1px);
  background-size: 92px 92px;
  -webkit-mask-image: radial-gradient(120% 88% at 18% 0%, #000 6%, transparent 68%);
  mask-image: radial-gradient(120% 88% at 18% 0%, #000 6%, transparent 68%);
  pointer-events: none;
}

.page-faq .faq-mast > .container {
  position: relative;
  z-index: 1;
}

.page-faq .faq-mast__crumb {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: clamp(24px, 4vh, 40px);
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .12em;
  color: var(--text-3);
}

.page-faq .faq-mast__crumb a {
  color: var(--text-2);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}

.page-faq .faq-mast__crumb a:hover {
  color: var(--gold);
}

.page-faq .faq-mast__crumb .breadcrumb__sep {
  color: var(--stone);
}

.page-faq .faq-mast__eyebrow {
  margin: 0 0 18px;
  color: var(--gold);
  font-size: .7rem;
  letter-spacing: .18em;
}

.page-faq .faq-mast__title {
  margin: 0 0 clamp(20px, 3vh, 28px);
  font-size: clamp(2.15rem, 6vw, 4.2rem);
  line-height: 1.06;
  letter-spacing: -.015em;
  max-width: 22ch;
}

.page-faq .faq-mast__lede {
  max-width: 62ch;
  margin: 0;
  color: var(--text-2);
  font-size: clamp(1rem, 1.2vw, 1.08rem);
  line-height: 1.85;
}

.page-faq .faq-mast__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 30px;
  margin: clamp(28px, 4vh, 40px) 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-mast__meta li {
  padding-left: 14px;
  border-left: 1px solid var(--faq-line);
  color: var(--text-3);
  font-size: .72rem;
  letter-spacing: .09em;
}

/* ---------- 主体布局 ---------- */
.page-faq .faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 52px);
}

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

.page-faq .faq-index__head {
  margin: 0 0 14px;
  font-size: .66rem;
  letter-spacing: .2em;
  color: var(--text-3);
  text-transform: uppercase;
}

.page-faq .faq-index__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-faq .faq-index__link {
  display: flex;
  gap: 10px;
  align-items: baseline;
  padding: 9px 12px;
  white-space: nowrap;
  border-left: 1px solid var(--faq-line);
  color: var(--text-2);
  font-size: .84rem;
  text-decoration: none;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-faq .faq-index__link .mono {
  font-size: .66rem;
  letter-spacing: .12em;
  color: var(--text-3);
  transition: color var(--dur) var(--ease);
}

.page-faq .faq-index__link:hover {
  color: var(--text-1);
  background: rgba(142, 134, 240, .07);
}

.page-faq .faq-index__link[data-active] {
  color: var(--text-1);
  border-left-color: var(--gold);
  background: rgba(217, 164, 65, .08);
}

.page-faq .faq-index__link[data-active] .mono {
  color: var(--gold);
}

.page-faq .faq-index__rule {
  display: none;
}

.page-faq .faq-index__foot {
  display: none;
}

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

/* ---------- 筛选 ---------- */
.page-faq .faq-filter {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  padding: 12px 14px;
  border: 1px solid var(--faq-line);
  background: rgba(7, 11, 22, .62);
}

.page-faq .faq-filter__label {
  margin-right: 4px;
  font-size: .66rem;
  letter-spacing: .18em;
  color: var(--text-3);
  text-transform: uppercase;
}

.page-faq .faq-filter__count {
  margin-left: auto;
  font-size: .72rem;
  letter-spacing: .08em;
  color: var(--text-3);
}

.page-faq .faq-filter__count b {
  color: var(--gold);
  font-weight: 600;
}

/* ---------- 问答组 ---------- */
.page-faq .faq-group {
  position: relative;
  margin-top: clamp(38px, 5vw, 62px);
  padding-top: clamp(20px, 3vw, 30px);
  border-top: 1px solid var(--faq-line);
  scroll-margin-top: 116px;
}

.page-faq .faq-group__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: baseline;
  gap: 0 16px;
  margin-bottom: clamp(16px, 2.4vw, 26px);
}

.page-faq .faq-group__num {
  font-size: .72rem;
  letter-spacing: .2em;
  color: var(--gold);
}

.page-faq .faq-group__title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.3rem, 2.6vw, 1.85rem);
  letter-spacing: -.01em;
  color: var(--text-1);
}

.page-faq .faq-group__note {
  grid-column: 2;
  margin: 10px 0 0;
  max-width: 58ch;
  color: var(--text-3);
  font-size: .84rem;
  line-height: 1.8;
}

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

/* ---------- 问答条目 ---------- */
.page-faq .faq-item {
  position: relative;
  padding: clamp(16px, 2vw, 22px) 0 clamp(16px, 2vw, 22px) 22px;
  border-bottom: 1px solid var(--faq-line);
}

.page-faq .faq-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: clamp(19px, 2.2vw, 25px);
  width: 2px;
  height: 24px;
  background: var(--stone);
  opacity: .55;
  transition: background var(--dur) var(--ease), opacity var(--dur) var(--ease), height var(--dur) var(--ease);
}

.page-faq .faq-item:has(.faq-panel[data-open])::before {
  background: var(--gold);
  opacity: 1;
  height: 34px;
}

.page-faq .faq-item[data-filtered-out] {
  display: none;
}

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

.page-faq .faq-trigger {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  width: 100%;
  margin: 0;
  padding: 0;
  border: 0;
  background: none;
  color: var(--text-1);
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(.98rem, 1.5vw, 1.08rem);
  line-height: 1.6;
  text-align: left;
  cursor: pointer;
}

.page-faq .faq-trigger__num {
  flex: none;
  padding-top: .3em;
  font-size: .66rem;
  letter-spacing: .12em;
  color: var(--text-3);
  transition: color var(--dur) var(--ease);
}

.page-faq .faq-trigger:hover .faq-trigger__num,
.page-faq .faq-trigger[aria-expanded="true"] .faq-trigger__num {
  color: var(--gold);
}

.page-faq .faq-trigger__text {
  flex: 1 1 auto;
  min-width: 0;
}

.page-faq .faq-trigger__icon {
  position: relative;
  flex: none;
  width: 14px;
  height: 14px;
  margin-top: .42em;
}

.page-faq .faq-trigger__icon::before,
.page-faq .faq-trigger__icon::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  width: 13px;
  height: 1px;
  background: var(--text-3);
  transition: transform var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-faq .faq-trigger__icon::before {
  transform: translate(-50%, -50%);
}

.page-faq .faq-trigger__icon::after {
  transform: translate(-50%, -50%) rotate(90deg);
}

.page-faq .faq-trigger:hover .faq-trigger__icon::before,
.page-faq .faq-trigger:hover .faq-trigger__icon::after {
  background: var(--gold);
}

.page-faq .faq-trigger[aria-expanded="true"] .faq-trigger__icon::after {
  transform: translate(-50%, -50%) rotate(0deg);
  background: var(--gold);
}

.page-faq .faq-trigger[aria-expanded="true"] .faq-trigger__icon::before {
  background: var(--gold);
}

.page-faq .faq-item__verdict {
  margin: 10px 0 0 34px;
  max-width: 68ch;
  color: var(--text-2);
  font-size: .88rem;
  line-height: 1.8;
}

.page-faq .faq-item__verdict-k {
  display: inline-block;
  margin-right: 10px;
  padding: 1px 7px;
  border: 1px solid rgba(124, 154, 107, .42);
  color: var(--moss);
  font-size: .64rem;
  letter-spacing: .14em;
  vertical-align: .1em;
}

.page-faq .faq-panel {
  margin: 14px 0 0 34px;
  padding-left: 16px;
  border-left: 1px solid var(--faq-line);
  max-width: 70ch;
  color: var(--text-2);
  font-size: .92rem;
  line-height: 1.85;
}

.page-faq .faq-panel p {
  margin: 0 0 12px;
}

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

.page-faq .faq-panel__ref {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: baseline;
  font-size: .78rem;
  color: var(--text-3);
}

.page-faq .faq-panel__ref a {
  color: var(--violet-soft);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-faq .faq-panel__ref a:hover {
  color: var(--gold);
  border-bottom-color: var(--faq-gold-line);
}

/* ---------- 安装条件配图 ---------- */
.page-faq .faq-figure {
  margin: 26px 0 0;
}

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

.page-faq .faq-figure__cap {
  display: block;
  margin-top: 10px;
  font-size: .64rem;
  letter-spacing: .08em;
  line-height: 1.7;
  color: var(--text-3);
}

/* ---------- 保养周期刻度 ---------- */
.page-faq .faq-group--cycle {
  overflow: hidden;
}

.page-faq .cycle-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .13;
  filter: saturate(.65);
  pointer-events: none;
}

.page-faq .faq-group--cycle > *:not(.cycle-bg) {
  position: relative;
  z-index: 1;
}

.page-faq .cycle-scale {
  position: relative;
  margin: clamp(18px, 3vw, 30px) 0 clamp(16px, 2.2vw, 24px);
  padding: 8px 0 0;
}

.page-faq .cycle-scale__axis {
  position: absolute;
  left: 0;
  right: 0;
  top: 8px;
  height: 1px;
  background: linear-gradient(90deg, var(--faq-line), rgba(142, 134, 240, .5) 55%, var(--faq-gold-line));
}

.page-faq .cycle-scale__nodes {
  position: relative;
  display: flex;
  justify-content: space-between;
}

.page-faq .cycle-node {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  padding: 0;
  border: 0;
  background: none;
  color: var(--text-3);
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .08em;
  cursor: pointer;
  transition: color var(--dur) var(--ease);
}

.page-faq .cycle-node__mark {
  display: block;
  width: 1px;
  height: 18px;
  background: var(--violet-soft);
  transition: height var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-faq .cycle-node__label {
  white-space: nowrap;
}

.page-faq .cycle-node--24 {
  color: var(--gold);
}

.page-faq .cycle-node--24 .cycle-node__mark {
  height: 28px;
  background: var(--gold);
}

.page-faq .cycle-node:hover {
  color: var(--text-1);
}

.page-faq .cycle-node:hover .cycle-node__mark {
  background: var(--gold);
}

.page-faq .cycle-node[aria-expanded="true"] .cycle-node__mark {
  background: var(--gold);
}

.page-faq .cycle-notes {
  display: grid;
  gap: 10px;
  margin: 0 0 clamp(20px, 3vw, 30px);
}

.page-faq .cycle-note {
  margin: 0;
  padding: 13px 16px;
  border-left: 2px solid var(--gold);
  background: rgba(11, 16, 32, .74);
  color: var(--text-2);
  font-size: .9rem;
  line-height: 1.8;
}

.page-faq .cycle-note__k {
  display: block;
  margin-bottom: 6px;
  font-size: .66rem;
  letter-spacing: .16em;
  color: var(--gold);
}

.page-faq .cycle-note p {
  margin: 0;
}

/* ---------- 桌面布局 ---------- */
@media (min-width: 1000px) {
  .page-faq .faq-layout {
    grid-template-columns: 208px minmax(0, 1fr);
    gap: clamp(36px, 4vw, 64px);
  }

  .page-faq .faq-index {
    position: sticky;
    top: 116px;
    align-self: start;
  }

  .page-faq .faq-index__list {
    flex-direction: column;
    gap: 2px;
    padding: 0;
    overflow: visible;
  }

  .page-faq .faq-index__rule {
    display: block;
    height: 1px;
    margin: 20px 0 14px;
    background: var(--faq-line);
  }

  .page-faq .faq-index__foot {
    display: block;
    margin: 0;
    font-size: .64rem;
    line-height: 1.95;
    letter-spacing: .04em;
    color: var(--text-3);
  }
}

@media (max-width: 999px) {
  .page-faq .faq-index__link {
    border-left: 0;
    border-bottom: 1px solid var(--faq-line);
  }

  .page-faq .faq-index__link[data-active] {
    border-left-color: transparent;
    border-bottom-color: var(--gold);
  }
}

@media (min-width: 1080px) {
  .page-faq .faq-group--install .faq-group__body {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(170px, 236px);
    gap: clamp(24px, 3vw, 46px);
    align-items: start;
  }
}

@media (max-width: 1079px) {
  .page-faq .faq-figure {
    max-width: 340px;
  }
}

/* ---------- 窄屏收敛 ---------- */
@media (max-width: 620px) {
  .page-faq .faq-item {
    padding-left: 16px;
  }

  .page-faq .faq-item::before {
    top: 20px;
    height: 20px;
  }

  .page-faq .faq-item__verdict,
  .page-faq .faq-panel {
    margin-left: 0;
  }

  .page-faq .faq-trigger {
    gap: 10px;
  }

  .page-faq .cycle-node {
    font-size: .62rem;
  }

  .page-faq .cycle-node__label {
    transform: scale(.94);
  }

  .page-faq .faq-filter__count {
    margin-left: 0;
    width: 100%;
  }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-trigger__icon::before,
  .page-faq .faq-trigger__icon::after,
  .page-faq .faq-item::before,
  .page-faq .cycle-node__mark,
  .page-faq .faq-index__link {
    transition: none;
  }
}