.page-faq {
  --faq-rail-w: 236px;
  --faq-answer-bg: var(--c-field);
  background: var(--c-field);
  color: var(--c-ice);
  font-family: var(--font-body);
  padding-bottom: 72px;
}

.page-faq .shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.page-faq .breadcrumb {
  padding-top: 18px;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding: 22px 0 34px;
  background-image: linear-gradient(128deg, transparent 0 56%, var(--c-pulse-08) 56% 100%);
  border-bottom: var(--line);
}

.page-faq .faq-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(34px, 8.6vw, 88px);
  line-height: 1.02;
  letter-spacing: -0.02em;
  color: var(--c-ice);
  max-width: 20ch;
}

.page-faq .faq-lede {
  margin: 18px 0 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--c-ice);
}

.page-faq .faq-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

/* ---------- 两栏布局 ---------- */
.page-faq .faq-layout {
  display: grid;
  gap: 26px;
  margin-top: 32px;
}

.page-faq .faq-rail {
  border: var(--line);
  background: var(--c-stand);
  border-radius: var(--radius);
  padding: 14px;
}

.page-faq .faq-rail-title {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--c-grey);
}

.page-faq .faq-rail-list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.page-faq .faq-rail-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 12px;
  border: var(--line);
  border-radius: var(--radius);
  color: var(--c-grey);
  font-size: 13px;
  white-space: nowrap;
  text-decoration: none;
  transition: color 120ms var(--ease), border-color 120ms var(--ease),
    background-color 120ms var(--ease), transform 120ms var(--ease);
}

.page-faq .faq-rail-link .index-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--c-pulse);
}

.page-faq .faq-rail-link:hover,
.page-faq .faq-rail-link:focus-visible {
  color: var(--c-ice);
  border-color: var(--c-pulse-40);
  background: var(--c-pulse-08);
}

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

.page-faq .faq-rail-note {
  display: none;
  margin: 0;
  font-size: 12px;
  line-height: 1.75;
  color: var(--c-grey);
}

/* ---------- 分组 ---------- */
.page-faq .faq-group {
  scroll-margin-top: 96px;
}

.page-faq .faq-group + .faq-group {
  margin-top: 46px;
  padding-top: 32px;
  border-top: var(--line);
}

.page-faq .faq-group-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: baseline;
  gap: 8px 14px;
  margin-bottom: 18px;
}

.page-faq .faq-group-index {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--c-pulse);
  border: 1px solid var(--c-pulse-18);
  border-radius: var(--radius);
  padding: 4px 7px;
}

.page-faq .faq-group-head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 5vw, 40px);
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--c-ice);
}

.page-faq .faq-group-note {
  grid-column: 2;
  margin: 0;
  max-width: 56ch;
  font-size: 14px;
  line-height: 1.75;
  color: var(--c-grey);
}

/* ---------- 问答折叠 ---------- */
.page-faq .faq-list {
  display: grid;
  gap: 10px;
  min-width: 0;
}

.page-faq .faq-item {
  border: var(--line);
  border-radius: var(--radius);
  background: var(--c-stand);
  transition: border-color 120ms var(--ease);
}

.page-faq .faq-item:hover,
.page-faq .faq-item[open] {
  border-color: var(--c-pulse-40);
}

.page-faq .faq-item summary {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  padding: 15px 16px;
  cursor: pointer;
  list-style: none;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.55;
  color: var(--c-ice);
}

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

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

.page-faq .faq-mark {
  position: relative;
  flex: 0 0 16px;
  width: 16px;
  height: 16px;
  margin-top: 4px;
}

.page-faq .faq-mark::before,
.page-faq .faq-mark::after {
  content: "";
  position: absolute;
  background: var(--c-pulse);
}

.page-faq .faq-mark::before {
  top: 50%;
  left: 0;
  right: 0;
  height: 1.5px;
  transform: translateY(-50%);
}

.page-faq .faq-mark::after {
  top: 0;
  bottom: 0;
  left: 50%;
  width: 1.5px;
  transform: translateX(-50%);
  transition: transform 160ms var(--ease), opacity 160ms var(--ease);
}

.page-faq .faq-item[open] > summary .faq-mark::after {
  transform: translateX(-50%) scaleY(0);
  opacity: 0;
}

.page-faq .faq-answer {
  padding: 16px;
  background: var(--faq-answer-bg);
  border-top: var(--line);
}

.page-faq .faq-answer p {
  margin: 0 0 12px;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--c-ice);
}

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

.page-faq .faq-answer a {
  color: var(--c-pulse);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: var(--c-pulse-40);
  transition: text-decoration-color 120ms var(--ease);
}

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

.page-faq .faq-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  color: var(--c-pulse);
  padding: 0 2px;
}

/* ---------- 复制邮箱 ---------- */
.page-faq .faq-copy {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 12px;
  margin-top: 14px;
}

.page-faq .copy-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  border: var(--line);
  border-radius: var(--radius);
  background: var(--c-stand);
  color: var(--c-ice);
  font-family: var(--font-mono);
  font-size: 13px;
  cursor: pointer;
  transition: border-color 120ms var(--ease), background-color 120ms var(--ease);
}

.page-faq .copy-btn:hover,
.page-faq .copy-btn:focus-visible {
  border-color: var(--c-pulse);
  background: var(--c-pulse-08);
}

.page-faq .copy-btn:focus-visible {
  outline: 2px solid var(--c-pulse);
  outline-offset: 2px;
}

.page-faq .copy-btn .copy-status {
  font-size: 12px;
  color: var(--c-pulse);
}

.page-faq .faq-copy-hint {
  font-size: 12px;
  color: var(--c-grey);
}

/* ---------- 图 ---------- */
.page-faq .faq-media {
  margin: 0;
  border: var(--line);
  border-radius: var(--radius);
  background: var(--c-stand);
  overflow: hidden;
}

.page-faq .faq-media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}

.page-faq .faq-media .media-caption {
  padding: 10px 12px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--c-grey);
  border-top: var(--line);
}

.page-faq .faq-media--inline {
  margin: 4px 0;
}

/* ---------- 底部横向条 ---------- */
.page-faq .faq-strip {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px 24px;
  margin-top: 52px;
  padding: 20px;
  background: var(--c-stand);
  border: var(--line);
  border-left: 2px solid var(--c-pulse);
  border-radius: var(--radius);
}

.page-faq .faq-strip-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 20px;
  line-height: 1.3;
  color: var(--c-ice);
}

.page-faq .faq-strip-note {
  margin: 6px 0 0;
  max-width: 54ch;
  font-size: 14px;
  line-height: 1.75;
  color: var(--c-grey);
}

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-faq .faq-layout {
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
    gap: 52px;
    margin-top: 48px;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: 88px;
    align-self: start;
    border: 0;
    border-left: 1px solid var(--c-net);
    border-radius: 0;
    background: transparent;
    padding: 2px 0 2px 0;
  }

  .page-faq .faq-rail-list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding: 0;
  }

  .page-faq .faq-rail-link {
    border: 0;
    border-bottom: var(--line);
    border-radius: 0;
    width: 100%;
    padding: 12px 14px;
    justify-content: flex-start;
    transition: color 120ms var(--ease), background-color 120ms var(--ease),
      transform 120ms var(--ease);
  }

  .page-faq .faq-rail-link:hover,
  .page-faq .faq-rail-link:focus-visible {
    transform: translateX(4px);
    background: var(--c-pulse-08);
  }

  .page-faq .faq-rail-note {
    display: block;
    margin-top: 18px;
    padding-left: 14px;
  }

  .page-faq .faq-hero {
    padding: 26px 0 44px;
  }

  .page-faq .faq-group-note {
    font-size: 15px;
  }
}

@media (min-width: 1100px) {
  .page-faq .faq-group--media .faq-body {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 300px;
    gap: 30px;
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-rail-link,
  .page-faq .faq-item,
  .page-faq .faq-mark::after,
  .page-faq .copy-btn,
  .page-faq .faq-answer a {
    transition: none;
  }

  .page-faq .faq-rail-link:hover,
  .page-faq .faq-rail-link:focus-visible {
    transform: none;
  }
}