.page-faq {
  --faq-num-w: 34px;
  color: var(--paper);
}

/* ---------- 首屏框景 ---------- */
.page-faq .faq-hero {
  padding-top: clamp(18px, 3.4vw, 36px);
}

.page-faq .faq-stage {
  position: relative;
  margin-top: clamp(14px, 2vw, 22px);
  border: 1px solid var(--line);
  border-radius: var(--r-xl);
  background:
    radial-gradient(120% 90% at 88% 0%, rgba(47, 227, 168, 0.10), transparent 62%),
    linear-gradient(165deg, var(--ink-850), var(--ink-900) 72%);
  padding: clamp(20px, 3.4vw, 44px);
  overflow: hidden;
}

.page-faq .faq-stage::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 15px;
  background-image: repeating-linear-gradient(90deg, var(--line) 0 1px, transparent 1px 18px);
  opacity: 0.85;
  pointer-events: none;
}

.page-faq .faq-stage__grid {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.4vw, 44px);
  align-items: center;
}

.page-faq .faq-stage h1 {
  margin: 12px 0 0;
  font-family: var(--font-title);
  font-weight: 800;
  font-size: clamp(26px, 5.4vw, 40px);
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.page-faq .faq-stage .lead {
  margin: 14px 0 0;
  max-width: 48ch;
  font-size: 17px;
  line-height: 1.85;
  color: var(--mist);
}

.page-faq .faq-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(104px, 1fr));
  gap: 10px;
  margin-top: clamp(18px, 2.4vw, 28px);
}

.page-faq .faq-stats .metric {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--ink-800);
}

.page-faq .faq-stats .metric-value {
  font-family: var(--font-num);
  font-weight: 800;
  font-size: 26px;
  line-height: 1.1;
  color: var(--neon);
}

.page-faq .faq-stats .metric-label {
  font-size: 13px;
  line-height: 1.5;
  color: var(--mist);
}

.page-faq .faq-stage__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: clamp(18px, 2.4vw, 26px);
}

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

.page-faq .faq-stage__figure img,
.page-faq .faq-group__media img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
}

/* ---------- 主体：左筛选 + 右问答 ---------- */
.page-faq .faq-body {
  padding-top: clamp(28px, 4vw, 58px);
}

.page-faq .faq-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 36px);
  align-items: start;
}

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

.page-faq .faq-rail__title {
  margin: 0;
  font-family: var(--font-title);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.page-faq .faq-filters {
  display: flex;
  flex-wrap: nowrap;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 8px;
  scrollbar-width: thin;
}

.page-faq .faq-filters .filter-btn {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 15px;
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  background: var(--ink-800);
  color: var(--mist);
  font: inherit;
  font-size: 14px;
  line-height: 1.4;
  white-space: nowrap;
  cursor: pointer;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-faq .faq-filters .filter-btn:hover {
  border-color: var(--neon-soft);
  color: var(--paper);
}

.page-faq .faq-filters .filter-btn:focus-visible {
  outline: 2px solid var(--neon-soft);
  outline-offset: 2px;
}

.page-faq .faq-filters .filter-btn[aria-pressed="true"] {
  background: var(--neon);
  border-color: var(--neon);
  color: var(--ink-900);
  font-weight: 700;
}

.page-faq .faq-filters .filter-btn .filter-count {
  font-family: var(--font-num);
  font-size: 12px;
  opacity: 0.82;
}

.page-faq .faq-rail__note {
  margin: 0;
  font-size: 13px;
  color: var(--mist);
}

.page-faq .faq-rail__note .num {
  color: var(--neon-soft);
  font-family: var(--font-num);
  font-weight: 700;
}

.page-faq .faq-rail__tip {
  padding: 14px 16px;
  border-radius: var(--r-md);
}

.page-faq .faq-rail__tip p {
  margin: 0 0 10px;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 问答分组 ---------- */
.page-faq .faq-group {
  margin-bottom: clamp(28px, 3.6vw, 50px);
  scroll-margin-top: 84px;
}

.page-faq .faq-group:not(:has(.faq-item:not([hidden]))) {
  display: none;
}

.page-faq .faq-group__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 14px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 6px;
}

.page-faq .faq-group__idx {
  font-family: var(--font-num);
  font-weight: 800;
  font-size: 20px;
  line-height: 1;
  color: var(--moss);
}

.page-faq .faq-group__head h2 {
  flex: 1 1 240px;
  margin: 0;
  font-family: var(--font-title);
  font-weight: 800;
  font-size: clamp(19px, 2.6vw, 24px);
  line-height: 1.35;
}

.page-faq .faq-group__head .tag {
  flex: 0 0 auto;
}

.page-faq .faq-group__body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(16px, 2.4vw, 28px);
  align-items: start;
}

.page-faq .faq-group__media {
  margin: 0;
  border-radius: var(--r-lg);
}

/* ---------- 折叠问答 ---------- */
.page-faq .faq-item {
  border-bottom: 1px solid var(--line);
}

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

.page-faq .faq-item summary {
  position: relative;
  display: grid;
  grid-template-columns: var(--faq-num-w) minmax(0, 1fr) 20px;
  gap: 12px;
  align-items: start;
  padding: 16px 6px 16px 10px;
  list-style: none;
  cursor: pointer;
  transition: background var(--dur) var(--ease);
}

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

.page-faq .faq-item summary::before {
  content: "";
  position: absolute;
  left: 0;
  top: 14px;
  bottom: 14px;
  width: 2px;
  border-radius: 2px;
  background: transparent;
  transition: background var(--dur) var(--ease);
}

.page-faq .faq-item summary:hover {
  background: rgba(47, 227, 168, 0.06);
}

.page-faq .faq-item summary:focus-visible {
  outline: 2px solid var(--neon-soft);
  outline-offset: 2px;
  border-radius: var(--r-md);
}

.page-faq .faq-item[open] summary::before {
  background: var(--neon);
}

.page-faq .faq-num {
  padding-top: 3px;
  font-family: var(--font-num);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--mist);
  transition: color var(--dur) var(--ease);
}

.page-faq .faq-item[open] .faq-num {
  color: var(--neon);
}

.page-faq .faq-q {
  font-size: 16.5px;
  font-weight: 600;
  line-height: 1.6;
  color: var(--paper);
}

.page-faq .faq-sign {
  position: relative;
  width: 18px;
  height: 18px;
  margin-top: 5px;
}

.page-faq .faq-sign::before,
.page-faq .faq-sign::after {
  content: "";
  position: absolute;
  border-radius: 2px;
  background: var(--mist);
  transition: transform var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-faq .faq-sign::before {
  left: 0;
  right: 0;
  top: 8px;
  height: 2px;
}

.page-faq .faq-sign::after {
  top: 0;
  bottom: 0;
  left: 8px;
  width: 2px;
}

.page-faq .faq-item[open] .faq-sign::before {
  background: var(--neon);
}

.page-faq .faq-item[open] .faq-sign::after {
  transform: scaleY(0);
}

.page-faq .faq-a {
  padding: 0 6px 18px calc(var(--faq-num-w) + 22px);
}

.page-faq .faq-a p {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--mist);
}

/* ---------- 支持出口 ---------- */
.page-faq .faq-support {
  padding-top: clamp(8px, 1.6vw, 18px);
  padding-bottom: clamp(38px, 6vw, 78px);
}

.page-faq .faq-support__card {
  position: relative;
  padding: clamp(22px, 3.4vw, 42px);
  border: 1px solid var(--line);
  border-radius: var(--r-xl);
  background: linear-gradient(150deg, var(--ink-800), var(--ink-900) 76%);
  overflow: hidden;
}

.page-faq .faq-support__card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: linear-gradient(180deg, var(--neon), var(--moss));
}

.page-faq .faq-support__card h2 {
  margin: 12px 0 0;
  font-family: var(--font-title);
  font-weight: 800;
  font-size: clamp(21px, 3.2vw, 30px);
  line-height: 1.32;
}

.page-faq .faq-support__lead {
  margin: 12px 0 0;
  max-width: 56ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--mist);
}

.page-faq .faq-channels {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  margin: clamp(18px, 2.6vw, 26px) 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-channels li {
  display: grid;
  gap: 6px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--ink-850);
}

.page-faq .faq-channels__key {
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.page-faq .faq-channels__val {
  font-family: var(--font-title);
  font-weight: 700;
  font-size: 15px;
  line-height: 1.5;
  color: var(--paper);
  overflow-wrap: anywhere;
}

.page-faq .faq-channels__val.num {
  font-family: var(--font-num);
}

.page-faq .faq-support__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: clamp(18px, 2.4vw, 26px);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-faq .faq-channels {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 960px) {
  .page-faq .faq-stage__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  }
}

@media (min-width: 1024px) {
  .page-faq .faq-shell {
    grid-template-columns: 236px minmax(0, 1fr);
  }

  .page-faq .faq-rail {
    position: sticky;
    top: 20px;
  }

  .page-faq .faq-filters {
    flex-direction: column;
    flex-wrap: wrap;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-faq .faq-filters .filter-btn {
    width: 100%;
    justify-content: space-between;
  }
}

@media (min-width: 1100px) {
  .page-faq .faq-group__body--media {
    grid-template-columns: minmax(0, 1fr) 250px;
  }

  .page-faq .faq-group__media {
    position: sticky;
    top: 20px;
  }
}

@media (max-width: 560px) {
  .page-faq {
    --faq-num-w: 26px;
  }

  .page-faq .faq-item summary {
    gap: 10px;
    padding: 14px 4px 14px 8px;
  }

  .page-faq .faq-a {
    padding-left: calc(var(--faq-num-w) + 18px);
  }

  .page-faq .faq-q {
    font-size: 15.5px;
  }

  .page-faq .faq-stage__actions .btn,
  .page-faq .faq-support__actions .btn {
    width: 100%;
    justify-content: center;
  }
}