.page-faq {
  --faq-col: 760px;
  --faq-line-dark: rgba(244, 239, 228, 0.26);
  --faq-line-input: #C9C0AC;
  background-color: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
}

/* ---------- 首屏 ---------- */
.page-faq__intro {
  padding-top: clamp(20px, 4vw, 40px);
  padding-bottom: clamp(22px, 4vw, 38px);
}

.page-faq .crumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 14px;
  color: var(--muted);
  margin-bottom: clamp(18px, 3vw, 28px);
}

.page-faq .crumbs a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
}

.page-faq .crumbs a:hover,
.page-faq .crumbs a:focus-visible {
  color: var(--green);
  border-bottom-color: var(--green);
}

.page-faq__mast {
  position: relative;
  overflow: hidden;
  border: var(--edge);
  border-radius: var(--radius);
  box-shadow: var(--hard);
  background-color: var(--paper);
  padding: clamp(22px, 4vw, 40px);
}

.page-faq__mast::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 6px;
  background-color: var(--green);
}

.page-faq__mast::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: clamp(72px, 14vw, 140px);
  height: 6px;
  background-color: var(--gold);
}

.page-faq__kicker {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--green);
}

.page-faq__title {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(30px, 6vw, 42px);
  line-height: 1.12;
  letter-spacing: 0.01em;
}

.page-faq__lede {
  margin: 0 0 18px;
  max-width: 62ch;
  font-size: clamp(16px, 2.4vw, 17px);
  line-height: 1.75;
}

.page-faq__meta {
  margin: 0;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  max-width: 68ch;
  font-size: 14px;
  line-height: 1.65;
  color: var(--muted);
}

/* ---------- 章节跳转 ---------- */
.page-faq__jump {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: clamp(20px, 3vw, 30px);
}

.page-faq__jump a {
  display: inline-flex;
  align-items: center;
  padding: 8px 13px;
  border: var(--edge-hair);
  border-radius: var(--radius);
  background-color: var(--paper-2);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--ink);
  text-decoration: none;
  transition: background-color 120ms ease, color 120ms ease, border-color 120ms ease;
}

.page-faq__jump a:hover,
.page-faq__jump a:focus-visible {
  background-color: var(--green);
  border-color: var(--green);
  color: var(--paper);
}

/* ---------- 章节骨架 ---------- */
.page-faq__section {
  padding: clamp(34px, 6vw, 62px) 0;
  scroll-margin-top: 96px;
}

.page-faq__section--band {
  background-color: var(--paper-2);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-faq__section--dark {
  background-color: var(--green-deep);
  background-image:
    linear-gradient(rgba(244, 239, 228, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(244, 239, 228, 0.05) 1px, transparent 1px);
  background-size: 40px 40px;
  color: var(--paper);
}

.page-faq__col {
  max-width: var(--faq-col);
}

.page-faq__head {
  display: grid;
  grid-template-columns: 44px 1fr;
  column-gap: 12px;
  row-gap: 8px;
  border-bottom: 2px solid var(--ink);
  padding-bottom: 14px;
  margin-bottom: 22px;
}

.page-faq__no {
  grid-column: 1;
  grid-row: 1 / span 2;
  padding-top: 6px;
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.08em;
  color: var(--gold);
}

.page-faq__head h2 {
  grid-column: 2;
  margin: 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(21px, 3.4vw, 30px);
  line-height: 1.25;
}

.page-faq__sub {
  grid-column: 2;
  margin: 0;
  font-size: 14px;
  line-height: 1.65;
  color: var(--muted);
}

.page-faq__section--dark .page-faq__head {
  border-bottom-color: var(--gold);
}

.page-faq__section--dark .page-faq__head h2 {
  color: var(--paper);
}

.page-faq__section--dark .page-faq__sub {
  color: var(--line);
}

.page-faq__section--dark .page-faq__no {
  color: var(--gold);
}

/* ---------- 状态图例 ---------- */
.page-faq .legend {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
  margin: 0 0 20px;
  padding: 12px 14px;
  list-style: none;
  border: var(--edge-hair);
  border-radius: var(--radius);
  background-color: var(--paper);
}

.page-faq .legend__item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--ink);
}

.page-faq .legend__dot {
  flex: 0 0 auto;
  display: inline-block;
  width: 11px;
  height: 11px;
  border-radius: 2px;
}

.page-faq .legend__dot--up { background-color: var(--up); }
.page-faq .legend__dot--pending { background-color: var(--amber); }
.page-faq .legend__dot--out { background-color: var(--out); }

/* ---------- 问答条目 ---------- */
.page-faq .faq-list {
  border-top: 1px solid var(--line);
}

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

.page-faq .faq-q {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 0;
  list-style: none;
  cursor: pointer;
  font-size: 16px;
  font-weight: 500;
  line-height: 1.55;
  color: var(--ink);
  transition: color 120ms ease;
}

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

.page-faq .faq-q:hover { color: var(--green); }

.page-faq .faq-q:focus-visible {
  outline: 2px solid var(--green);
  outline-offset: 2px;
}

.page-faq .faq-q__text {
  display: block;
  max-width: 54ch;
}

.page-faq .faq-q__mark {
  flex: 0 0 auto;
  width: 11px;
  height: 11px;
  margin-top: 6px;
  border-right: 2px solid var(--green);
  border-bottom: 2px solid var(--green);
  transform: rotate(45deg);
  transition: transform 160ms ease;
}

.page-faq .faq-item[open] .faq-q {
  color: var(--green-deep);
  font-weight: 600;
}

.page-faq .faq-item[open] .faq-q__mark {
  transform: rotate(-135deg);
}

.page-faq .faq-a {
  margin: 0 0 2px;
  padding: 0 0 18px 14px;
  border-left: 2px solid var(--red);
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink);
}

.page-faq .faq-a p {
  margin: 0 0 8px;
  max-width: 60ch;
}

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

.page-faq .faq-a a {
  color: var(--green);
  text-decoration: none;
  border-bottom: 1px solid var(--gold);
}

.page-faq .faq-a a:hover,
.page-faq .faq-a a:focus-visible {
  border-bottom-color: var(--green);
}

/* ---------- 数字标记 ---------- */
.page-faq .n {
  font-family: var(--font-mono);
  font-size: 0.97em;
  padding-bottom: 1px;
  border-bottom: 2px solid var(--gold);
  white-space: nowrap;
}

/* ---------- 深色章节内的问答 ---------- */
.page-faq__section--dark .faq-list {
  border-top-color: var(--faq-line-dark);
}

.page-faq__section--dark .faq-item {
  border-bottom-color: var(--faq-line-dark);
}

.page-faq__section--dark .faq-q {
  color: var(--paper);
}

.page-faq__section--dark .faq-q:hover {
  color: var(--gold);
}

.page-faq__section--dark .faq-q__mark {
  border-right-color: var(--gold);
  border-bottom-color: var(--gold);
}

.page-faq__section--dark .faq-item[open] .faq-q {
  color: var(--gold);
}

.page-faq__section--dark .faq-a {
  color: var(--paper-2);
  border-left-color: var(--gold);
}

.page-faq__section--dark .faq-a a {
  color: var(--gold);
  border-bottom-color: rgba(198, 160, 82, 0.5);
}

.page-faq__section--dark .n {
  color: var(--paper);
}

/* ---------- 图 ---------- */
.page-faq__figure {
  margin: 0 0 22px;
  overflow: hidden;
  border: var(--edge);
  border-radius: var(--radius);
  box-shadow: var(--hard-sm);
  background-color: var(--paper);
}

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

.page-faq__cap {
  padding: 10px 14px;
  border-top: var(--edge-hair);
  background-color: var(--paper);
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

.page-faq__divider {
  display: block;
  overflow: hidden;
  border-top: 2px solid var(--ink);
  border-bottom: 2px solid var(--ink);
  background-color: var(--paper-2);
  line-height: 0;
}

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

/* ---------- 换气规则线 ---------- */
.page-faq__rule {
  position: relative;
  height: 1px;
  margin: clamp(28px, 5vw, 48px) 0;
  background-color: var(--line);
}

.page-faq__rule::after {
  content: "";
  position: absolute;
  left: 0;
  top: -3px;
  width: 56px;
  height: 7px;
  background-color: var(--green);
}

/* ---------- 页尾动作 ---------- */
.page-faq__foot {
  padding-bottom: clamp(48px, 8vw, 88px);
}

.page-faq__backtop {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 4px;
  padding: 10px 16px;
  border: var(--edge);
  border-radius: 999px;
  background-color: var(--paper);
  box-shadow: var(--hard-sm);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--ink);
  text-decoration: none;
  transition: transform 120ms ease, box-shadow 120ms ease;
}

.page-faq__backtop:hover,
.page-faq__backtop:focus-visible {
  transform: translate(-2px, -2px);
  box-shadow: 8px 8px 0 var(--ink);
}

.page-faq__footnote {
  margin: 20px 0 0;
  max-width: 68ch;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 响应式 ---------- */
@media (min-width: 768px) {
  .page-faq__head {
    grid-template-columns: 56px 1fr;
    column-gap: 16px;
  }

  .page-faq .faq-q {
    padding: 18px 0;
  }

  .page-faq .faq-a {
    padding-left: 18px;
  }
}

@media (max-width: 640px) {
  .page-faq__divider img {
    height: clamp(110px, 26vw, 180px);
    aspect-ratio: 3 / 1;
  }

  .page-faq .faq-q {
    gap: 12px;
  }

  .page-faq .faq-q__text {
    max-width: none;
  }

  .page-faq__jump a {
    flex: 1 1 auto;
    justify-content: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-q,
  .page-faq .faq-q__mark,
  .page-faq__jump a,
  .page-faq__backtop {
    transition: none;
  }

  .page-faq__backtop:hover,
  .page-faq__backtop:focus-visible {
    transform: none;
    box-shadow: var(--hard-sm);
  }
}