.page-faq {
  --faq-rail-w: 248px;
  --faq-top: 104px;
  --faq-hair: rgba(154, 166, 160, .22);
  background: var(--ink-900);
  color: var(--fg);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding: clamp(28px, 5vw, 64px) 0 clamp(32px, 5vw, 72px);
  background:
    radial-gradient(120% 90% at 88% 0%, rgba(23, 87, 63, .55) 0%, rgba(7, 18, 13, 0) 62%),
    var(--ink-900);
  overflow: hidden;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  inset: auto 0 -1px 0;
  height: 1px;
  background: var(--faq-hair);
  transform: skewY(-0.6deg);
  transform-origin: left;
}

.page-faq .faq-hero .breadcrumb {
  margin-bottom: clamp(24px, 4vw, 44px);
}

.page-faq .faq-hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 56px);
  align-items: end;
}

.page-faq .faq-hero-copy .eyebrow {
  display: block;
  margin-bottom: 18px;
}

.page-faq .faq-hero-copy .display {
  margin: 0 0 22px;
  max-width: 15ch;
}

.page-faq .faq-hero-copy .lede {
  max-width: 58ch;
  margin: 0 0 32px;
  color: rgba(247, 249, 246, .78);
}

.page-faq .faq-hero-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--faq-hair);
  border-top: 1px solid var(--faq-hair);
}

.page-faq .faq-hero-stats .stat {
  background: var(--ink-900);
  padding: 18px 16px 18px 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-faq .faq-hero-stats .stat + .stat {
  padding-left: 16px;
}

.page-faq .faq-hero-stats .stat-value {
  font-family: var(--font-mono);
  font-size: clamp(22px, 2.6vw, 32px);
  font-weight: 500;
  letter-spacing: .04em;
  color: var(--lime);
  line-height: 1;
}

.page-faq .faq-hero-stats .stat-label {
  font-size: 12px;
  line-height: 1.5;
  color: var(--mist);
  letter-spacing: .04em;
}

.page-faq .faq-hero-figure {
  margin: 0;
  position: relative;
}

.page-faq .faq-hero-figure .media-frame {
  display: block;
  background: var(--ink-800);
  border: 1px solid var(--ink-700);
  overflow: hidden;
}

.page-faq .faq-hero-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.82) brightness(.92);
}

.page-faq .faq-hero-figure .media-cap {
  display: block;
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--mist);
}

/* ---------- 筛选工具条 ---------- */
.page-faq .faq-toolbar {
  padding-top: clamp(22px, 3vw, 34px);
  padding-bottom: clamp(22px, 3vw, 34px);
  border-bottom: 1px solid var(--faq-hair);
}

.page-faq .faq-toolbar-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px 24px;
}

.page-faq .faq-toolbar .chip-row {
  flex-wrap: wrap;
}

.page-faq .faq-toolbar-note {
  margin: 0;
  color: var(--mist);
  font-size: 12px;
  letter-spacing: .08em;
}

.page-faq .faq-toolbar-note .num {
  color: var(--lime);
}

/* ---------- 主体双栏 ---------- */
.page-faq .faq-body {
  padding-top: clamp(36px, 5vw, 68px);
  padding-bottom: clamp(48px, 6vw, 90px);
}

.page-faq .faq-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 56px);
  align-items: start;
}

/* 左栏索引面板 */
.page-faq .faq-rail-panel {
  background: var(--paper);
  color: var(--graphite);
  padding: 24px 22px 22px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
}

.page-faq .faq-rail-eyebrow {
  color: var(--ink-700);
  margin: 0 0 18px;
  display: block;
}

.page-faq .faq-rail-eyebrow::before {
  background: var(--ink-700);
}

.page-faq .faq-rail-nav {
  display: flex;
  flex-direction: column;
}

.page-faq .faq-rail-link {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 12px 0;
  border-top: 1px solid rgba(20, 24, 26, .14);
  color: var(--graphite);
  text-decoration: none;
  transition: color .15s var(--ease), background-color .15s var(--ease);
}

.page-faq .faq-rail-link:last-child {
  border-bottom: 1px solid rgba(20, 24, 26, .14);
}

.page-faq .faq-rail-num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--ink-700);
  flex: none;
}

.page-faq .faq-rail-name {
  font-size: 15px;
  font-weight: 600;
  line-height: 1.4;
}

.page-faq .faq-rail-link:hover,
.page-faq .faq-rail-link:focus-visible {
  color: var(--ink-800);
  background: rgba(232, 255, 77, .55);
}

.page-faq .faq-rail-link:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 2px;
}

.page-faq .faq-rail-foot {
  margin: 20px 0 0;
  font-size: 12.5px;
  line-height: 1.7;
  color: rgba(20, 24, 26, .7);
}

/* 右栏问答 */
.page-faq .faq-list {
  display: flex;
  flex-direction: column;
  gap: clamp(36px, 4.6vw, 64px);
  min-width: 0;
}

.page-faq .faq-cat {
  scroll-margin-top: var(--faq-top);
  min-width: 0;
}

.page-faq .faq-cat-head {
  padding-bottom: 18px;
  border-bottom: 2px solid var(--line);
  margin-bottom: 4px;
}

.page-faq .faq-cat-head .eyebrow {
  display: block;
  margin-bottom: 12px;
  color: var(--lime);
}

.page-faq .faq-cat-head .headline {
  margin: 0 0 12px;
  max-width: 26ch;
  font-size: clamp(22px, 2.8vw, 34px);
  line-height: 1.25;
}

.page-faq .faq-cat-lede {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(247, 249, 246, .74);
}

.page-faq .faq-cat-media {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  margin: 24px 0 8px;
}

.page-faq .faq-cat-media figure {
  margin: 0;
}

.page-faq .faq-cat-media .media-frame {
  display: block;
  background: var(--ink-800);
  border: 1px solid var(--ink-700);
  overflow: hidden;
  max-width: 240px;
}

.page-faq .faq-cat-media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.82) brightness(.92);
}

.page-faq .faq-cat-media .media-cap {
  display: block;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .08em;
  color: var(--mist);
  line-height: 1.6;
}

.page-faq .faq-cat-media-text p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(247, 249, 246, .8);
  max-width: 60ch;
}

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

.page-faq .faq-item summary {
  list-style: none;
  cursor: pointer;
  position: relative;
  display: block;
  padding: 20px 40px 20px 30px;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.55;
  color: var(--ice);
  transition: color .15s var(--ease), background-color .15s var(--ease);
}

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

.page-faq .faq-item summary::before {
  content: "";
  position: absolute;
  left: 0;
  top: 29px;
  width: 14px;
  height: 2px;
  background: var(--lime);
  transition: transform .2s var(--ease);
}

.page-faq .faq-item summary::after {
  content: "";
  position: absolute;
  left: 6px;
  top: 23px;
  width: 2px;
  height: 14px;
  background: var(--lime);
  transition: transform .2s var(--ease);
}

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

.page-faq .faq-item summary:hover,
.page-faq .faq-item summary:focus-visible {
  color: var(--lime);
  background: rgba(23, 87, 63, .34);
}

.page-faq .faq-item summary:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: -2px;
}

.page-faq .faq-item summary::marker {
  content: "";
}

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

.page-faq .faq-item-body {
  padding: 0 40px 22px 30px;
  border-left: 3px solid var(--lime);
  margin-left: 0;
}

.page-faq .faq-item-body p {
  margin: 0 0 10px;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(247, 249, 246, .82);
  max-width: 66ch;
}

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

.page-faq .faq-item-body a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

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

.page-faq .faq-cat-link {
  margin: 20px 0 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--mist);
}

.page-faq .faq-cat-link a {
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid rgba(232, 255, 77, .5);
  padding-bottom: 2px;
}

.page-faq .faq-cat-link a:hover,
.page-faq .faq-cat-link a:focus-visible {
  border-bottom-color: var(--lime);
  color: var(--ice);
}

/* ---------- 收尾横条 ---------- */
.page-faq .faq-outro {
  padding-top: 0;
  padding-bottom: clamp(48px, 6vw, 88px);
}

.page-faq .faq-outro-panel {
  position: relative;
  background: var(--ink-800);
  border: 1px solid var(--ink-700);
  padding: clamp(26px, 3.6vw, 46px);
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 3vw, 40px);
  align-items: center;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}

.page-faq .faq-outro-panel::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 68px;
  height: 3px;
  background: var(--lime);
}

.page-faq .faq-outro-copy .eyebrow {
  display: block;
  margin-bottom: 12px;
  color: var(--lime);
}

.page-faq .faq-outro-title {
  margin: 0 0 14px;
  max-width: 24ch;
  font-size: clamp(22px, 2.8vw, 32px);
  line-height: 1.25;
}

.page-faq .faq-outro-text {
  margin: 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(247, 249, 246, .8);
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-faq .faq-cat-media {
    grid-template-columns: 240px minmax(0, 1fr);
    align-items: start;
    gap: 28px;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-faq .faq-layout {
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
    gap: clamp(36px, 4vw, 64px);
  }

  .page-faq .faq-rail {
    position: sticky;
    top: var(--faq-top);
    align-self: start;
  }

  .page-faq .faq-outro-panel {
    grid-template-columns: minmax(0, 1fr) auto;
  }

  .page-faq .faq-outro-actions {
    flex-direction: column;
    align-items: stretch;
    min-width: 200px;
  }
}

@media (min-width: 1200px) {
  .page-faq {
    --faq-rail-w: 272px;
  }

  .page-faq .faq-hero-grid {
    grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
  }
}

@media (max-width: 599px) {
  .page-faq .faq-hero-stats {
    grid-template-columns: 1fr;
  }

  .page-faq .faq-hero-stats .stat + .stat {
    padding-left: 0;
  }

  .page-faq .faq-item summary {
    padding-right: 20px;
  }

  .page-faq .faq-item-body {
    padding-right: 20px;
  }

  .page-faq .faq-cat-media .media-frame {
    max-width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .page-faq .faq-item summary::before,
  .page-faq .faq-item summary::after {
    transition: none;
  }
}