.page-faq {
  --faq-ans-ink: #22303c;
  --faq-sticky-top: 0px;
  color: var(--white);
  padding-bottom: clamp(48px, 8vw, 96px);
  overflow-x: clip;
}

/* 首屏声明 */
.page-faq .faq-hero {
  padding: clamp(20px, 4vw, 40px) 0 clamp(24px, 4vw, 44px);
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 6vw, 4.4rem);
  line-height: 1.04;
  letter-spacing: -0.01em;
  margin: 0.35em 0 0.4em;
  max-width: 18ch;
}

.page-faq .faq-hero .lede {
  max-width: 56ch;
  margin: 0;
  color: var(--mist);
  font-size: clamp(1rem, 1.6vw, 1.1rem);
  line-height: 1.78;
}

.page-faq .faq-stats {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(18px, 5vw, 52px);
  margin-top: clamp(20px, 3vw, 32px);
}

.page-faq .faq-stat {
  display: grid;
  gap: 2px;
  border-left: 2px solid var(--teal);
  padding-left: 12px;
}

.page-faq .faq-stat b {
  font-family: var(--font-mono);
  font-size: clamp(1.35rem, 2.6vw, 1.9rem);
  font-weight: 600;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
  line-height: 1.1;
}

.page-faq .faq-stat span {
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--mist);
}

/* 章节头 */
.page-faq .faq-sechead {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 6px 14px;
  align-items: baseline;
  margin-bottom: clamp(14px, 2.4vw, 22px);
}

.page-faq .faq-sechead .n {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--lime);
  border-top: 1px solid var(--lime);
  padding-top: 4px;
}

.page-faq .faq-sechead h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.3rem, 2.8vw, 1.9rem);
  letter-spacing: -0.005em;
  line-height: 1.25;
}

.page-faq .faq-sechead p {
  grid-column: 1 / -1;
  margin: 0;
  max-width: 62ch;
  color: var(--mist);
  font-size: 0.9rem;
  line-height: 1.72;
}

/* 01 快速定位 */
.page-faq .faq-locate {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
  padding: clamp(32px, 5vw, 60px) 0 clamp(20px, 3vw, 36px);
}

.page-faq .faq-topics {
  list-style: none;
  margin: clamp(14px, 2.4vw, 22px) 0 0;
  padding: 0;
}

.page-faq .faq-topics li {
  border-top: 1px solid var(--line);
}

.page-faq .faq-topics li:last-child {
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-topics a {
  display: grid;
  grid-template-columns: 3.1rem 1fr;
  gap: 12px;
  align-items: baseline;
  padding: 14px 4px;
  color: var(--white);
  text-decoration: none;
  transition: color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-faq .faq-topics a:hover,
.page-faq .faq-topics a:focus-visible {
  color: var(--lime);
  background: rgba(20, 103, 196, 0.12);
}

.page-faq .faq-topics .t-num {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--info);
  letter-spacing: 0.04em;
}

.page-faq .faq-topics .t-name {
  display: block;
  font-weight: 700;
  font-size: 1rem;
  line-height: 1.5;
}

.page-faq .faq-topics .t-desc {
  display: block;
  margin-top: 3px;
  color: var(--mist);
  font-size: 0.84rem;
  line-height: 1.65;
}

/* 图片 */
.page-faq .faq-photo {
  margin: 0;
  position: relative;
  background: var(--blue-deep);
  border: 1px solid var(--line-strong);
  transform: rotate(-1deg);
}

.page-faq .faq-photo img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  aspect-ratio: 3 / 2;
}

.page-faq .faq-photo figcaption {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.03em;
  color: var(--mist);
  padding: 10px 12px;
  border-top: 1px solid var(--line);
}

/* 粘性筛选条 */
.page-faq .faq-body {
  position: relative;
}

.page-faq .faq-filterwrap {
  position: sticky;
  top: var(--faq-sticky-top);
  z-index: 30;
  padding: 10px 0;
  margin-bottom: clamp(18px, 3vw, 30px);
  background: rgba(6, 19, 31, 0.94);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line-strong);
  box-shadow: 0 14px 28px rgba(6, 19, 31, 0.5);
}

.page-faq .filter-bar {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
  padding-bottom: 2px;
}

.page-faq .filter-bar::-webkit-scrollbar {
  display: none;
}

.page-faq .filter-btn {
  flex: 0 0 auto;
  min-height: 44px;
  padding: 0 16px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: transparent;
  color: var(--mist);
  font-family: var(--font-body);
  font-size: 0.84rem;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: color 0.18s var(--ease), background 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-faq .filter-btn:hover {
  color: var(--white);
  border-color: var(--info);
}

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

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

/* 问答区 */
.page-faq .faq-section {
  padding: clamp(22px, 3.6vw, 40px) 0;
  border-top: 1px solid var(--line);
}

.page-faq .faq-item {
  border-left: 2px solid rgba(20, 103, 196, 0.55);
  background: rgba(255, 255, 255, 0.025);
  margin-bottom: 8px;
  transition: background 0.3s var(--ease), color 0.3s var(--ease), border-color 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.page-faq .faq-item:hover {
  border-left-color: var(--lime);
}

.page-faq .faq-item[open] {
  background: var(--paper);
  color: var(--ink);
  border-left-color: var(--orange);
  box-shadow: 0 18px 38px rgba(6, 19, 31, 0.38);
}

.page-faq .faq-item > summary {
  list-style: none;
  cursor: pointer;
  display: grid;
  grid-template-columns: 2.6rem 1fr 1rem;
  gap: 10px;
  align-items: start;
  padding: 15px 16px;
  font-size: 0.98rem;
  font-weight: 600;
  line-height: 1.6;
}

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

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

.page-faq .q-num {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.05em;
  color: var(--info);
  padding-top: 0.28em;
  font-variant-numeric: tabular-nums;
}

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

.page-faq .q-mark {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  line-height: 1.4;
  text-align: right;
  color: var(--lime);
  transition: transform 0.22s var(--ease), color 0.22s var(--ease);
}

.page-faq .faq-item[open] .q-mark {
  color: var(--orange);
  transform: rotate(45deg);
}

.page-faq .faq-a {
  position: relative;
  padding: 6px 18px 20px 18px;
  color: var(--faq-ans-ink);
  font-size: 0.93rem;
  line-height: 1.82;
}

.page-faq .faq-a::before {
  content: "";
  position: absolute;
  left: 18px;
  top: 0;
  width: 58px;
  height: 3px;
  background: var(--lime);
  transform: skewX(-24deg);
}

.page-faq .faq-a p {
  margin: 10px 0 0;
  max-width: 62ch;
}

.page-faq .faq-a a {
  color: var(--blue-deep);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: rgba(11, 46, 89, 0.45);
}

.page-faq .faq-a a:hover {
  text-decoration-color: var(--orange);
}

/* 关注列表区带侧图 */
.page-faq .faq-watch-grid {
  display: grid;
  gap: clamp(20px, 3vw, 36px);
}

.page-faq .faq-photo--side {
  transform: rotate(1deg);
}

.page-faq .faq-photo--side img {
  aspect-ratio: 3 / 2;
}

/* 仍未解决 */
.page-faq .faq-unresolved {
  margin-top: clamp(24px, 4vw, 44px);
  padding: clamp(22px, 4vw, 42px);
  display: grid;
  gap: 22px;
  background: linear-gradient(128deg, var(--blue-deep) 0%, var(--teal) 100%);
  border-left: 4px solid var(--orange);
}

.page-faq .faq-unresolved h2 {
  margin: 8px 0 12px;
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 3vw, 2.1rem);
  line-height: 1.2;
  letter-spacing: -0.005em;
}

.page-faq .faq-unresolved p {
  margin: 0;
  max-width: 64ch;
  color: var(--mist);
  font-size: 0.94rem;
  line-height: 1.78;
}

.page-faq .faq-unresolved a:not(.btn) {
  color: var(--info);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-faq .faq-unresolved-copy .eyebrow {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  color: var(--lime);
  margin: 0;
}

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

.page-faq .faq-cta .btn {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 22px;
}

/* 页脚说明条 */
.page-faq .faq-footnote {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 24px;
  align-items: center;
  justify-content: space-between;
  margin-top: clamp(22px, 3.4vw, 38px);
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.page-faq .faq-footnote p {
  margin: 0;
  color: var(--mist);
  font-size: 0.86rem;
  line-height: 1.7;
}

.page-faq .faq-footnote .link-arrow {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  color: var(--lime);
  text-decoration: none;
}

.page-faq .faq-footnote .link-arrow:hover {
  color: var(--orange);
}

/* 平板及以上 */
@media (min-width: 760px) {
  .page-faq {
    --faq-sticky-top: 62px;
  }

  .page-faq .faq-unresolved {
    grid-template-columns: 1fr auto;
    align-items: center;
  }

  .page-faq .faq-item > summary {
    padding: 17px 20px;
    grid-template-columns: 3.1rem 1fr 1.2rem;
  }

  .page-faq .faq-a {
    padding: 6px 22px 22px 22px;
    font-size: 0.95rem;
  }

  .page-faq .faq-a::before {
    left: 22px;
  }
}

/* 桌面非对称分栏与错位叠放 */
@media (min-width: 980px) {
  .page-faq .faq-locate {
    grid-template-columns: 1.15fr 0.85fr;
    align-items: start;
  }

  .page-faq .faq-locate .faq-photo {
    margin-top: 18px;
  }

  .page-faq .faq-watch-grid {
    grid-template-columns: 1.25fr 0.75fr;
    align-items: start;
  }

  .page-faq .faq-photo--side {
    position: sticky;
    top: calc(var(--faq-sticky-top) + 84px);
  }

  .page-faq .faq-item:nth-child(even) {
    margin-left: clamp(0px, 2vw, 20px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-photo,
  .page-faq .faq-item,
  .page-faq .q-mark,
  .page-faq .filter-btn {
    transition: none;
    transform: none;
  }

  .page-faq .faq-item[open] .q-mark {
    transform: none;
  }
}