/* ===== 常见问答 /page-faq ===== */
.page-faq {
  --faq-rail-w: 236px;
  --faq-glow: rgba(182, 255, 60, 0.06);
  padding-top: 24px;
}

/* ---- 面包屑 ---- */
.page-faq .breadcrumb {
  margin-bottom: 20px;
}
.page-faq .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-faq .breadcrumb__item {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--muted);
}
.page-faq .breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  display: inline-block;
  margin: 0 10px;
  color: var(--grid);
}
.page-faq .breadcrumb__link {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.18s ease, border-color 0.18s ease;
}
.page-faq .breadcrumb__link:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}
.page-faq .breadcrumb__current {
  color: var(--ink);
}

/* ---- 首屏 ---- */
.page-faq .faq-hero__grid {
  display: grid;
  gap: 30px;
  padding: 16px 0 40px;
  border-bottom: 1px solid var(--grid);
}
.page-faq .faq-hero__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(2.2rem, 6vw, 4.4rem);
  line-height: 0.99;
  letter-spacing: -0.025em;
  color: var(--ink);
}
.page-faq .faq-hero__lede {
  margin: 20px 0 0;
  max-width: 48ch;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--muted);
}
.page-faq .faq-hero__stats {
  display: flex;
  flex-wrap: wrap;
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--grid);
}
.page-faq .faq-hero__stats li {
  flex: 1 1 88px;
  padding: 14px 14px 14px 0;
  border-right: 1px solid var(--grid);
}
.page-faq .faq-hero__stats li + li {
  padding-left: 16px;
}
.page-faq .faq-hero__stats li:last-child {
  border-right: 0;
}
.page-faq .faq-hero__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.65rem;
  line-height: 1;
  color: var(--accent);
}
.page-faq .faq-hero__cap {
  display: block;
  margin-top: 8px;
  font-size: 0.75rem;
  letter-spacing: 0.02em;
  color: var(--muted);
}
.page-faq .faq-hero__media {
  position: relative;
  aspect-ratio: 1400 / 620;
  border: 1px solid var(--grid);
  overflow: hidden;
  background: var(--rail);
}
.page-faq .faq-hero__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.page-faq .faq-hero__media::before,
.page-faq .faq-hero__media::after {
  content: "";
  position: absolute;
  width: 22px;
  height: 22px;
  border: 1px solid var(--accent);
  pointer-events: none;
}
.page-faq .faq-hero__media::before {
  top: 10px;
  left: 10px;
  border-right: 0;
  border-bottom: 0;
}
.page-faq .faq-hero__media::after {
  right: 10px;
  bottom: 10px;
  border-top: 0;
  border-left: 0;
}

/* ---- 两栏骨架 ---- */
.page-faq .faq-body {
  display: grid;
  gap: 34px;
  padding: 34px 0 80px;
}
.page-faq .faq-rail {
  align-self: start;
  min-width: 0;
}
.page-faq .rail__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}
.page-faq .rail__nav {
  display: flex;
  gap: 0;
  overflow-x: auto;
  border-top: 1px solid var(--grid);
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}
.page-faq .rail__link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  flex: 0 0 auto;
  padding: 12px 16px 12px 0;
  font-size: 0.86rem;
  line-height: 1.4;
  color: var(--muted);
  text-decoration: none;
  white-space: nowrap;
  border-bottom: 1px solid var(--grid);
  transition: color 0.18s ease, border-color 0.18s ease;
}
.page-faq .rail__index {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--muted);
  opacity: 0.6;
}
.page-faq .rail__link:hover {
  color: var(--ink);
}
.page-faq .rail__link.is-current {
  color: var(--accent);
  border-bottom-color: var(--accent);
}
.page-faq .rail__link.is-current .rail__index {
  color: var(--accent);
  opacity: 1;
}
.page-faq .rail__note {
  display: none;
  margin: 18px 0 0;
  padding-left: 12px;
  border-left: 1px solid var(--grid);
  font-size: 0.78rem;
  line-height: 1.75;
  color: var(--muted);
}

/* ---- 分组 ---- */
.page-faq .faq-stream {
  min-width: 0;
}
.page-faq .faq-group + .faq-group {
  margin-top: 10px;
}
.page-faq .faq-group__head {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr);
  gap: 12px;
  padding: 32px 0 16px;
  border-top: 1px solid var(--grid);
}
.page-faq .faq-group:first-child .faq-group__head {
  padding-top: 0;
  border-top: 0;
}
.page-faq .faq-group__index {
  padding-top: 8px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--accent);
}
.page-faq .faq-group__meta {
  min-width: 0;
}
.page-faq .faq-group__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(1.45rem, 3.4vw, 2.05rem);
  line-height: 1.15;
  letter-spacing: -0.015em;
  color: var(--ink);
}
.page-faq .faq-group__scope {
  margin: 10px 0 0;
  padding-left: 12px;
  border-left: 1px solid var(--grid);
  font-size: 0.82rem;
  line-height: 1.7;
  color: var(--muted);
}

/* ---- 折叠面板 ---- */
.page-faq .faq-group__list {
  border-top: 1px solid var(--grid);
}
.page-faq .accordion__item {
  padding: 0 12px;
  border-bottom: 1px solid var(--grid);
  border-left: 2px solid transparent;
  transition: border-color 0.18s ease, background-color 0.18s ease;
}
.page-faq .accordion__item:hover {
  border-left-color: var(--grid);
}
.page-faq .accordion__item:has(.accordion__panel:not([hidden])),
.page-faq .accordion__item:has([aria-expanded="true"]) {
  border-left-color: var(--accent);
  background: linear-gradient(90deg, var(--faq-glow), transparent 70%);
}
.page-faq .faq-q {
  margin: 0;
  font-size: inherit;
  font-weight: inherit;
}
.page-faq .accordion__trigger {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  width: 100%;
  padding: 18px 0;
  background: none;
  border: 0;
  color: inherit;
  font: inherit;
  text-align: left;
  cursor: pointer;
}
.page-faq .accordion__trigger:focus-visible {
  outline: 1px solid var(--accent);
  outline-offset: 2px;
}
.page-faq .accordion__index {
  flex: 0 0 auto;
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--muted);
  transition: color 0.18s ease;
}
.page-faq .accordion__label {
  flex: 1 1 auto;
  min-width: 0;
  font-family: var(--font-head);
  font-size: 1rem;
  font-weight: 500;
  line-height: 1.55;
  color: var(--ink);
}
.page-faq .accordion__icon {
  position: relative;
  flex: 0 0 auto;
  width: 14px;
  height: 14px;
  margin-top: 6px;
  color: var(--muted);
  transition: color 0.18s ease;
}
.page-faq .accordion__icon::before,
.page-faq .accordion__icon::after {
  content: "";
  position: absolute;
  background: currentColor;
}
.page-faq .accordion__icon::before {
  top: 50%;
  left: 0;
  right: 0;
  height: 1.5px;
  transform: translateY(-50%);
}
.page-faq .accordion__icon::after {
  top: 0;
  bottom: 0;
  left: 50%;
  width: 1.5px;
  transform: translateX(-50%);
  transition: transform 0.2s ease, opacity 0.2s ease;
}
.page-faq .accordion__item:has(.accordion__panel:not([hidden])) .accordion__index,
.page-faq .accordion__item:has([aria-expanded="true"]) .accordion__index,
.page-faq .accordion__item:has(.accordion__panel:not([hidden])) .accordion__icon,
.page-faq .accordion__item:has([aria-expanded="true"]) .accordion__icon {
  color: var(--accent);
}
.page-faq .accordion__item:has(.accordion__panel:not([hidden])) .accordion__icon::after,
.page-faq .accordion__item:has([aria-expanded="true"]) .accordion__icon::after {
  transform: translateX(-50%) scaleY(0);
  opacity: 0;
}
.page-faq .accordion__panel {
  max-width: 68ch;
  padding: 0 24px 22px 0;
  font-size: 0.94rem;
  line-height: 1.85;
  color: var(--muted);
}
.page-faq .accordion__panel[hidden] {
  display: none;
}
.page-faq .accordion__panel p {
  margin: 0 0 10px;
}
.page-faq .accordion__panel p:last-child {
  margin-bottom: 0;
}
.page-faq .accordion__panel a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}
.page-faq .accordion__panel a:hover {
  color: var(--accent-soft);
}

/* ---- 章节配图 ---- */
.page-faq .faq-figure {
  margin: 0 0 22px;
  border: 1px solid var(--grid);
  background: var(--rail);
}
.page-faq .faq-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}
.page-faq .faq-figure .figure__cap {
  padding: 12px 16px;
  border-top: 1px solid var(--grid);
  font-size: 0.78rem;
  line-height: 1.7;
  color: var(--muted);
}

/* ---- 平板及以上 ---- */
@media (min-width: 760px) {
  .page-faq .accordion__item {
    padding: 0 18px;
  }
  .page-faq .accordion__label {
    font-size: 1.06rem;
  }
  .page-faq .faq-group__head {
    grid-template-columns: 56px minmax(0, 1fr);
    gap: 18px;
    padding: 40px 0 20px;
  }
  .page-faq .faq-group__index {
    padding-top: 12px;
  }
}

/* ---- 桌面：侧轨常驻 ---- */
@media (min-width: 980px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    gap: 52px;
    align-items: center;
    padding-bottom: 56px;
  }
}

@media (min-width: 1080px) {
  .page-faq {
    padding-top: 32px;
  }
  .page-faq .faq-body {
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
    gap: 56px;
    padding-top: 48px;
  }
  .page-faq .faq-rail {
    position: sticky;
    top: calc(var(--header-offset) + 14px);
  }
  .page-faq .rail__nav {
    flex-direction: column;
    overflow: visible;
    border-top: 0;
  }
  .page-faq .rail__link {
    flex: 1 1 auto;
    width: 100%;
    padding: 11px 8px 11px 12px;
    white-space: normal;
    border-bottom: 0;
    border-left: 2px solid var(--grid);
  }
  .page-faq .rail__link:hover {
    border-left-color: var(--accent-soft);
  }
  .page-faq .rail__link.is-current {
    border-left-color: var(--accent);
    border-bottom-color: transparent;
  }
  .page-faq .rail__note {
    display: block;
  }
}

/* ---- 减少动态效果 ---- */
@media (prefers-reduced-motion: reduce) {
  .page-faq .accordion__icon,
  .page-faq .accordion__icon::after,
  .page-faq .accordion__item,
  .page-faq .accordion__index,
  .page-faq .rail__link,
  .page-faq .breadcrumb__link {
    transition: none;
  }
}
</main>