.page-faq {
  --faq-rail-w: 224px;
  --faq-rail-gap: 44px;
  display: block;
  background: var(--bg);
  color: var(--c-ink);
  padding-bottom: 0;
}

/* ---------- 面包屑 ---------- */
.page-faq .faq-crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  padding-top: 24px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--c-muted);
}
.page-faq .faq-crumb a {
  color: var(--c-muted);
  text-decoration: none;
  padding-bottom: 1px;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) ease, border-color var(--dur) ease;
}
.page-faq .faq-crumb a:hover {
  color: var(--c-cyan);
  border-bottom-color: var(--c-cyan);
}
.page-faq .faq-crumb__sep {
  color: var(--c-line);
}
.page-faq .faq-crumb__current {
  color: var(--c-cyan);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  padding-top: 42px;
  padding-bottom: 40px;
}
.page-faq .faq-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
  padding-top: 26px;
  border-top: 1px solid var(--c-line);
}
.page-faq .faq-hero__index {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-cyan);
}
.page-faq .faq-hero__title {
  margin: 16px 0 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(36px, 8.4vw, 76px);
  line-height: 1.04;
  letter-spacing: -0.02em;
  color: var(--c-white);
}
.page-faq .faq-hero__lede {
  margin: 20px 0 0;
  max-width: 48ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--c-ink);
}
.page-faq .faq-hero__stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--c-line);
  border: 1px solid var(--c-line);
  align-self: end;
}
.page-faq .faq-stat {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 18px 14px;
  background: var(--c-panel);
}
.page-faq .faq-stat__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(24px, 6vw, 30px);
  line-height: 1;
  color: var(--c-cyan);
}
.page-faq .faq-stat__label {
  font-size: 12px;
  line-height: 1.5;
  color: var(--c-muted);
}

/* ---------- 主体骨架 ---------- */
.page-faq .faq-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
  padding-top: 8px;
  padding-bottom: 72px;
}

/* ---------- 目录索引 ---------- */
.page-faq .faq-rail {
  padding-top: 18px;
  border-top: 1px solid var(--c-line);
}
.page-faq .faq-rail__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-muted);
}
.page-faq .faq-rail__list {
  display: flex;
  gap: 8px;
  margin: 14px 0 0;
  padding: 0 0 4px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
}
.page-faq .faq-rail__list::-webkit-scrollbar {
  display: none;
}
.page-faq .faq-rail__list li {
  flex: 0 0 auto;
}
.page-faq .faq-rail__link {
  display: block;
  padding: 9px 13px;
  border: 1px solid var(--c-line);
  color: var(--c-muted);
  font-size: 13px;
  line-height: 1.4;
  white-space: nowrap;
  text-decoration: none;
  transition: color var(--dur) ease, border-color var(--dur) ease, background var(--dur) ease;
}
.page-faq .faq-rail__link:hover {
  color: var(--c-ink);
  border-color: var(--c-cyan-dim);
}
.page-faq .faq-rail__link[aria-current="true"] {
  color: var(--c-cyan);
  border-color: var(--c-cyan);
  background: var(--accent-soft);
}

/* ---------- 问题分组 ---------- */
.page-faq .faq-group {
  scroll-margin-top: calc(var(--header-h) + 24px);
}
.page-faq .faq-group + .faq-group {
  margin-top: 50px;
}
.page-faq .faq-group__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--c-line);
}
.page-faq .faq-group__title {
  margin: 0;
  font-family: var(--font-body);
  font-weight: 500;
  font-size: clamp(19px, 2.6vw, 24px);
  line-height: 1.35;
  letter-spacing: 0.01em;
  color: var(--c-white);
}

/* ---------- 展开问题组 ---------- */
.page-faq .accordion__item {
  position: relative;
  border-bottom: 1px solid var(--c-line);
}
.page-faq .accordion__item:last-child {
  border-bottom: 0;
}
.page-faq .accordion__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--c-cyan);
  transform: scaleY(0);
  transform-origin: 50% 0;
  transition: transform var(--dur) ease;
  pointer-events: none;
}
.page-faq .accordion__item[data-read="true"]::before {
  transform: scaleY(1);
}
.page-faq .accordion__trigger {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  width: 100%;
  margin: 0;
  padding: 19px 16px;
  background: transparent;
  border: 0;
  text-align: left;
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 500;
  line-height: 1.55;
  color: var(--c-ink);
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  transition: color var(--dur) ease, background var(--dur) ease;
}
.page-faq .accordion__trigger:hover {
  color: var(--c-white);
  background: rgba(0, 232, 206, 0.05);
}
.page-faq .accordion__trigger:focus-visible {
  outline: 1px solid var(--c-cyan);
  outline-offset: -1px;
}
.page-faq .accordion__mark {
  position: relative;
  flex: 0 0 auto;
  width: 13px;
  height: 13px;
  margin-top: 4px;
  border: 1px solid var(--c-muted);
  transform-origin: center;
  transition: border-color var(--dur) ease, transform var(--dur) ease;
}
.page-faq .accordion__mark::before,
.page-faq .accordion__mark::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  background: var(--c-muted);
  transition: opacity var(--dur) ease, background var(--dur) ease;
}
.page-faq .accordion__mark::before {
  width: 7px;
  height: 1px;
  transform: translate(-50%, -50%);
}
.page-faq .accordion__mark::after {
  width: 1px;
  height: 7px;
  transform: translate(-50%, -50%);
}
.page-faq .accordion__item[data-read="true"] .accordion__mark {
  border-color: var(--c-cyan);
  transform: rotate(90deg);
}
.page-faq .accordion__item[data-read="true"] .accordion__mark::before {
  background: var(--c-cyan);
}
.page-faq .accordion__item[data-read="true"] .accordion__mark::after {
  opacity: 0;
}
.page-faq .accordion__panel {
  max-width: 70ch;
  padding: 0 16px 24px 43px;
  font-size: 15px;
  line-height: 1.82;
  color: var(--c-ink);
}
.page-faq .accordion__panel[hidden] {
  display: none;
}
.page-faq .accordion__panel > p {
  margin: 0 0 12px;
}
.page-faq .accordion__panel > p:last-child {
  margin-bottom: 0;
}

/* ---------- 面板内的图形 ---------- */
.page-faq .accordion__panel .media-frame {
  margin: 18px 0 0;
  border: 1px solid var(--c-line);
  background: var(--c-panel);
}
.page-faq .accordion__panel .media-frame img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}
.page-faq .accordion__panel .media-frame--tall {
  max-width: 280px;
}
.page-faq .accordion__panel .media-frame__caption {
  padding: 10px 12px;
  border-top: 1px solid var(--c-line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--c-muted);
}

/* ---------- 快捷入口条 ---------- */
.page-faq .faq-quick {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 22px;
  margin-top: 26px;
  padding: 14px 0;
  border-top: 1px solid var(--c-line);
  border-bottom: 1px solid var(--c-line);
}
.page-faq .faq-quick__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-muted);
}
.page-faq .faq-quick__link {
  color: var(--c-cyan);
  font-size: 14px;
  line-height: 1.5;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur) ease, color var(--dur) ease;
}
.page-faq .faq-quick__link:hover {
  border-bottom-color: var(--c-cyan);
}

/* ---------- 收尾 ---------- */
.page-faq .faq-outro {
  padding: 56px 0 76px;
  border-top: 1px solid var(--c-line);
  background: linear-gradient(180deg, var(--c-panel) 0%, var(--bg) 100%);
}
.page-faq .faq-outro__inner {
  max-width: 620px;
}
.page-faq .faq-outro__title {
  margin: 16px 0 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(26px, 5.6vw, 42px);
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--c-white);
}
.page-faq .faq-outro__text {
  margin: 18px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-ink);
}
.page-faq .faq-outro__mail {
  display: inline-block;
  margin: 22px 0 0;
  padding: 12px 18px;
  border: 1px solid var(--c-line);
  border-left: 2px solid var(--c-cyan);
  background: var(--c-raise);
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.02em;
  color: var(--c-cyan);
  word-break: break-all;
}
.page-faq .faq-outro__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

/* ---------- 平板 ---------- */
@media (min-width: 768px) {
  .page-faq .faq-hero {
    padding-top: 56px;
    padding-bottom: 52px;
  }
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
    gap: 48px;
    align-items: end;
  }
  .page-faq .accordion__trigger {
    padding: 22px 20px;
    font-size: 17px;
  }
  .page-faq .accordion__mark {
    margin-top: 5px;
  }
  .page-faq .accordion__panel {
    padding: 0 20px 28px 47px;
  }
}

/* ---------- 桌面：窄栏目录 + 宽栏问题组 ---------- */
@media (min-width: 1024px) {
  .page-faq {
    --faq-rail-w: 232px;
  }
  .page-faq .faq-body {
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
    column-gap: 48px;
    row-gap: 0;
    align-items: start;
    padding-top: 18px;
    padding-bottom: 88px;
  }
  .page-faq .faq-rail {
    position: sticky;
    top: calc(var(--header-h) + 28px);
    padding-top: 20px;
  }
  .page-faq .faq-rail__list {
    display: block;
    margin-top: 16px;
    padding: 0;
    overflow: visible;
    border-left: 1px solid var(--c-line);
  }
  .page-faq .faq-rail__list li {
    flex: none;
  }
  .page-faq .faq-rail__link {
    border: 0;
    border-left: 2px solid transparent;
    margin-left: -1px;
    padding: 10px 14px;
    white-space: normal;
    font-size: 13.5px;
  }
  .page-faq .faq-rail__link[aria-current="true"] {
    border-left-color: var(--c-cyan);
    background: var(--accent-soft);
    color: var(--c-cyan);
  }
}

/* ---------- 超窄屏 ---------- */
@media (max-width: 560px) {
  .page-faq .faq-hero__stats {
    grid-template-columns: minmax(0, 1fr);
  }
  .page-faq .faq-stat {
    flex-direction: row;
    align-items: baseline;
    gap: 12px;
    padding: 14px 16px;
  }
  .page-faq .accordion__panel {
    padding-left: 16px;
    padding-right: 16px;
  }
  .page-faq .accordion__panel .media-frame {
    margin-left: -0px;
  }
}

/* ---------- 降低动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-faq .accordion__mark,
  .page-faq .accordion__item::before,
  .page-faq .accordion__trigger,
  .page-faq .faq-rail__link,
  .page-faq .faq-crumb a,
  .page-faq .faq-quick__link {
    transition: none;
  }
}