.page-faq {
  --faq-rail-width: 288px;
  --faq-measure: 66ch;
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  position: relative;
  padding: calc(var(--header-offset) + 16px) 0 clamp(26px, 4vw, 44px);
  overflow: hidden;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.7;
  background-image:
    linear-gradient(to right, rgba(51, 68, 63, 0.5) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(51, 68, 63, 0.35) 1px, transparent 1px);
  background-size: 80px 80px;
  -webkit-mask-image: radial-gradient(120% 90% at 8% 0%, #000 0%, transparent 68%);
  mask-image: radial-gradient(120% 90% at 8% 0%, #000 0%, transparent 68%);
}

.page-faq .faq-hero > .shell {
  position: relative;
  z-index: 1;
}

.page-faq .faq-hero__title {
  margin: 14px 0 0;
  max-width: 20ch;
  font-family: var(--font-display);
  font-size: clamp(32px, 5.6vw, 66px);
  font-weight: 400;
  line-height: 1.06;
  letter-spacing: -0.03em;
  color: var(--paper);
}

.page-faq .faq-hero__lead {
  max-width: 62ch;
  margin-top: 18px;
}

.page-faq .faq-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

/* ---------- 首屏数字条 ---------- */

.page-faq .faq-quick {
  display: grid;
  grid-template-columns: 1fr;
  margin: clamp(26px, 4vw, 40px) 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-quick__item {
  padding: 14px 4px;
}

.page-faq .faq-quick__item + .faq-quick__item {
  border-top: 1px solid var(--line-soft);
}

.page-faq .faq-quick__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-faq .faq-quick__value {
  margin: 8px 0 0;
  font-size: 16px;
  line-height: 1.5;
  color: var(--paper);
}

.page-faq .faq-quick__value .num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 20px;
  letter-spacing: -0.01em;
  color: var(--cyan);
}

@media (min-width: 720px) {
  .page-faq .faq-quick {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-faq .faq-quick__item {
    padding: 16px 20px;
  }

  .page-faq .faq-quick__item:first-child {
    padding-left: 0;
  }

  .page-faq .faq-quick__item + .faq-quick__item {
    border-top: 0;
    border-left: 1px solid var(--line-soft);
  }
}

/* ---------- 主体布局 ---------- */

.page-faq .faq-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 52px);
  padding-bottom: clamp(56px, 8vw, 104px);
}

@media (min-width: 1000px) {
  .page-faq .faq-layout {
    grid-template-columns: minmax(240px, var(--faq-rail-width)) minmax(0, 1fr);
    align-items: start;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: calc(var(--header-offset) + 8px);
  }
}

/* ---------- 左侧索引栏 ---------- */

.page-faq .faq-rail {
  display: flex;
  flex-direction: column;
  gap: 16px;
  min-width: 0;
}

.page-faq .faq-rail__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 500;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-faq .faq-chips {
  gap: 6px;
}

@media (max-width: 999px) {
  .page-faq .faq-chips {
    flex-wrap: nowrap;
    overflow-x: auto;
    padding-bottom: 8px;
    scrollbar-width: none;
  }

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

  .page-faq .faq-chips .chip {
    flex: 0 0 auto;
  }
}

.page-faq .faq-nav {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--line);
}

.page-faq .faq-nav__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 11px 0;
  border-bottom: 1px solid var(--line-soft);
  font-size: 14px;
  line-height: 1.5;
  color: var(--muted);
  text-decoration: none;
  transition: color 150ms var(--ease), padding-left 150ms var(--ease);
}

.page-faq .faq-nav__link .idx {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--line);
  transition: color 150ms var(--ease);
}

.page-faq .faq-nav__link:hover,
.page-faq .faq-nav__link:focus-visible {
  color: var(--cyan);
  padding-left: 6px;
}

.page-faq .faq-nav__link:hover .idx,
.page-faq .faq-nav__link:focus-visible .idx {
  color: var(--cyan);
}

.page-faq .faq-rail__media {
  margin: 6px 0 0;
  border: 1px solid var(--line-soft);
  border-radius: var(--r-md);
  overflow: hidden;
}

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

/* ---------- 右侧问答流 ---------- */

.page-faq .faq-stream {
  display: flex;
  flex-direction: column;
  gap: clamp(30px, 4vw, 46px);
  min-width: 0;
}

.page-faq .faq-group {
  padding-top: clamp(20px, 3vw, 30px);
  border-top: 1px solid var(--line);
}

.page-faq .faq-group:first-child {
  border-top-color: var(--cyan);
}

.page-faq .faq-group__head {
  margin-bottom: 14px;
}

.page-faq .faq-group__title {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-size: clamp(22px, 2.8vw, 32px);
  font-weight: 400;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--paper);
}

/* ---------- 折叠条目 ---------- */

.page-faq .faq-item {
  border-bottom: 1px solid var(--line-soft);
}

.page-faq .faq-item summary {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr) 20px;
  gap: 10px;
  align-items: start;
  padding: 16px 6px;
  cursor: pointer;
  list-style: none;
  transition: background-color 150ms var(--ease), box-shadow 150ms var(--ease);
}

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

.page-faq .faq-item summary::marker {
  content: "";
  display: none;
}

.page-faq .faq-item summary:hover {
  background: var(--graphite);
  box-shadow: inset 2px 0 0 var(--cyan);
}

.page-faq .faq-item summary:focus-visible {
  outline: 1px solid var(--cyan);
  outline-offset: 2px;
}

.page-faq .faq-item__no {
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.12em;
  color: var(--muted);
}

.page-faq .faq-item__text {
  font-family: var(--font-display);
  font-size: clamp(15.5px, 1.5vw, 18px);
  font-weight: 500;
  line-height: 1.5;
  letter-spacing: -0.005em;
  color: var(--paper);
  transition: color 160ms var(--ease);
}

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

.page-faq .faq-item__mark {
  position: relative;
  justify-self: end;
  width: 18px;
  height: 18px;
  margin-top: 4px;
}

.page-faq .faq-item__mark::before,
.page-faq .faq-item__mark::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 50%;
  height: 1px;
  background: var(--muted);
  transition: transform 180ms var(--ease), background-color 180ms var(--ease);
}

.page-faq .faq-item__mark::after {
  transform: rotate(90deg);
}

.page-faq .faq-item[open] .faq-item__mark::before,
.page-faq .faq-item[open] .faq-item__mark::after {
  background: var(--cyan);
}

.page-faq .faq-item[open] .faq-item__mark::after {
  transform: rotate(0deg);
}

.page-faq .faq-item__a {
  max-width: var(--faq-measure);
  padding: 2px 16px 22px 54px;
}

.page-faq .faq-item__a p {
  margin: 0 0 10px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

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

.page-faq .faq-item__a strong {
  font-weight: 600;
  color: var(--paper);
}

/* ---------- 自助步骤块 ---------- */

.page-faq .faq-steps {
  margin: 12px 0;
  padding: 12px 16px;
  background: var(--cyan-soft);
  border-left: 2px solid var(--cyan);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
}

.page-faq .faq-steps__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-faq .faq-steps__list {
  margin: 8px 0 0;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.9;
  color: var(--paper);
}

/* ---------- 章节内插图 ---------- */

.page-faq .faq-inline-media {
  max-width: 520px;
  margin: 26px 0 4px;
  border: 1px solid var(--line-soft);
  border-radius: var(--r-md);
  overflow: hidden;
}

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

/* ---------- 兜底区 ---------- */

.page-faq .faq-help {
  border-top-color: var(--orange);
}

.page-faq .faq-help__body {
  max-width: var(--faq-measure);
}

.page-faq .faq-help__body p {
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

.page-faq .faq-help__body .text-mono {
  color: var(--paper);
  overflow-wrap: anywhere;
}

.page-faq .faq-help__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

/* ---------- 窄屏 ---------- */

@media (max-width: 599px) {
  .page-faq .faq-item summary {
    grid-template-columns: 30px minmax(0, 1fr) 18px;
    gap: 8px;
    padding: 15px 2px;
  }

  .page-faq .faq-item__a {
    padding: 2px 4px 20px 38px;
  }

  .page-faq .faq-item__mark {
    width: 16px;
    height: 16px;
  }

  .page-faq .faq-inline-media {
    margin-top: 20px;
  }
}

/* ---------- 动效降级 ---------- */

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item summary,
  .page-faq .faq-item__text,
  .page-faq .faq-item__mark::before,
  .page-faq .faq-item__mark::after,
  .page-faq .faq-nav__link,
  .page-faq .faq-nav__link .idx {
    transition: none;
  }
}