.page-faq {
  background: var(--ink);
  color: var(--snow);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: 1.5rem 0 2.5rem;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(11, 110, 138, 0.3), rgba(7, 23, 34, 0) 72%), var(--ink);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(20, 67, 90, 0.45) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(20, 67, 90, 0.45) 1px, transparent 1px);
  background-size: 72px 72px;
  pointer-events: none;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--orange) 0 18%, var(--teal) 18% 34%, var(--ice) 34% 100%);
}

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

.page-faq .breadcrumb a {
  color: var(--teal);
}

.page-faq .faq-hero__frame {
  position: relative;
  margin-top: 1.25rem;
  padding: 1.35rem 1.15rem 1.6rem;
  border: 2px solid var(--line);
  border-left: 6px solid var(--orange);
  background: rgba(7, 23, 34, 0.74);
  box-shadow: 8px 8px 0 rgba(11, 110, 138, 0.32);
}

.page-faq .faq-hero__frame .eyebrow {
  margin: 0;
  color: var(--teal);
}

.page-faq .faq-hero h1 {
  margin: 0.55rem 0 0.9rem;
  font-size: clamp(1.95rem, 6.2vw, 3.5rem);
  line-height: 1.06;
  letter-spacing: -0.02em;
  font-weight: 900;
  color: var(--snow);
}

.page-faq .faq-hero__lead {
  margin: 0;
  max-width: 44ch;
  font-size: var(--step-3);
  line-height: 1.8;
  color: var(--muted);
}

.page-faq .faq-specs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem 2rem;
  margin: 1.5rem 0 0;
  padding: 0;
  list-style: none;
  font-size: var(--step-2);
  letter-spacing: 0.06em;
  color: var(--muted);
}

.page-faq .faq-specs strong {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--step-5);
  font-weight: 700;
  letter-spacing: 0;
  color: var(--teal);
  font-variant-numeric: tabular-nums;
}

/* ---------- 布局与索引 ---------- */
.page-faq .faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.25rem;
  padding-block: 1.5rem 3.5rem;
}

.page-faq .faq-nav {
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-nav__label {
  margin: 0 0 0.6rem;
  color: var(--ice-light);
}

.page-faq .faq-nav__list {
  display: flex;
  gap: 0.5rem;
  margin: 0;
  padding: 0 0 0.5rem;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-faq .faq-nav__list a {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.85rem;
  border: 1px solid var(--line);
  background: rgba(7, 23, 34, 0.65);
  color: var(--snow);
  font-size: var(--step-2);
  text-decoration: none;
  white-space: nowrap;
  transition: border-color 0.2s, background 0.2s, color 0.2s;
}

.page-faq .faq-nav__list .mono {
  font-size: 0.85em;
  color: var(--orange);
}

.page-faq .faq-nav__list a:hover,
.page-faq .faq-nav__list a:focus-visible {
  border-color: var(--teal);
  background: rgba(0, 209, 193, 0.1);
  color: var(--teal);
  outline: none;
}

/* ---------- 章节 ---------- */
.page-faq .faq-stream {
  min-width: 0;
}

.page-faq .faq-section {
  padding-block: 1.75rem 2rem;
  border-top: 1px solid var(--line);
  scroll-margin-top: 6rem;
}

.page-faq .faq-section:first-child {
  border-top: 0;
  padding-top: 0.5rem;
}

.page-faq .faq-section__head {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  margin-bottom: 1.1rem;
  padding-bottom: 0.75rem;
  border-bottom: 2px solid var(--ice);
}

.page-faq .faq-section__num {
  font-size: var(--step-5);
  line-height: 1;
  color: var(--orange);
}

.page-faq .faq-section__title {
  margin: 0;
  font-size: clamp(1.3rem, 3.4vw, 1.85rem);
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--snow);
}

/* ---------- 问答条目 ---------- */
.page-faq .faq-item {
  border-bottom: 1px solid rgba(20, 67, 90, 0.7);
  transition: background 0.2s;
}

.page-faq .faq-item[open] {
  background: rgba(11, 110, 138, 0.14);
}

.page-faq .faq-q {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: start;
  gap: 0.75rem;
  padding: 0.95rem 0.75rem 0.95rem 0.5rem;
  list-style: none;
  cursor: pointer;
  color: var(--snow);
  font-size: var(--step-4);
  font-weight: 700;
  line-height: 1.5;
  transition: color 0.2s;
}

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

.page-faq .faq-q::marker {
  content: "";
}

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

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

.page-faq .faq-q__num {
  padding-top: 0.3em;
  font-size: var(--step-2);
  color: var(--ice-light);
}

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

.page-faq .faq-q__sign {
  position: relative;
  width: 14px;
  height: 14px;
  margin-top: 0.42em;
  flex: none;
}

.page-faq .faq-q__sign::before,
.page-faq .faq-q__sign::after {
  content: "";
  position: absolute;
  background: var(--teal);
  transition: transform 0.2s;
}

.page-faq .faq-q__sign::before {
  left: 0;
  top: 6px;
  width: 14px;
  height: 2px;
}

.page-faq .faq-q__sign::after {
  left: 6px;
  top: 0;
  width: 2px;
  height: 14px;
}

.page-faq .faq-item[open] .faq-q__sign::after {
  transform: scaleY(0);
}

.page-faq .faq-a {
  padding: 0 1rem 1.15rem 2.6rem;
}

.page-faq .faq-a p {
  margin: 0;
  max-width: 48ch;
  font-size: var(--step-3);
  line-height: 1.8;
  color: var(--muted);
}

.page-faq .faq-a a {
  color: var(--teal);
  text-decoration: underline;
  text-underline-offset: 3px;
}

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

/* ---------- 提醒时间轴图形 ---------- */
.page-faq .faq-axis {
  display: block;
  width: 100%;
  max-width: 420px;
  height: auto;
  margin: 1.1rem 0 1.25rem;
  padding: 0.75rem 1rem;
  border: 1px solid var(--line);
  background: rgba(7, 23, 34, 0.6);
}

/* ---------- 配图 ---------- */
.page-faq .faq-figure {
  margin: 1.5rem 0 0.5rem;
}

.page-faq .faq-figure--narrow {
  max-width: 300px;
}

.page-faq .faq-figure .media-frame {
  width: 100%;
}

.page-faq .faq-figure img {
  display: block;
  max-width: 100%;
  height: auto;
}

.page-faq .faq-figure__cap {
  margin-top: 0.6rem;
  font-size: var(--step-2);
  letter-spacing: 0.06em;
  color: var(--ice-light);
}

/* ---------- 收尾跳转 ---------- */
.page-faq .faq-next {
  margin-top: 2.5rem;
  padding: 1.5rem 1.15rem 1.6rem;
  border: 2px solid var(--line);
  border-top: 6px solid var(--orange);
  background: rgba(11, 110, 138, 0.16);
  box-shadow: 8px 8px 0 rgba(20, 67, 90, 0.55);
}

.page-faq .faq-next__lead {
  margin: 0 0 1.1rem;
  font-size: var(--step-4);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--snow);
}

.page-faq .faq-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

/* ---------- 桌面端：左索引 + 右问答 ---------- */
@media (min-width: 64em) {
  .page-faq .faq-hero {
    padding: 2rem 0 3.5rem;
  }

  .page-faq .faq-hero__frame {
    padding: 2rem 2.25rem 2.25rem;
    box-shadow: 12px 12px 0 rgba(11, 110, 138, 0.32);
  }

  .page-faq .faq-layout {
    grid-template-columns: 250px minmax(0, 1fr);
    gap: 3.5rem;
    padding-block: 3rem 5rem;
  }

  .page-faq .faq-nav {
    position: sticky;
    top: 6.5rem;
    align-self: start;
    padding: 0 0 0 1.15rem;
    border-bottom: 0;
    border-left: 2px solid var(--line);
  }

  .page-faq .faq-nav__list {
    flex-direction: column;
    gap: 0.2rem;
    padding: 0;
    overflow: visible;
  }

  .page-faq .faq-nav__list a {
    padding: 0.35rem 0;
    border: 0;
    background: none;
    color: var(--snow);
    white-space: normal;
    line-height: 1.5;
  }

  .page-faq .faq-nav__list a:hover,
  .page-faq .faq-nav__list a:focus-visible {
    background: none;
    border-color: transparent;
  }

  .page-faq .faq-section {
    padding-block: 2.5rem 3rem;
  }

  .page-faq .faq-section__head {
    margin-bottom: 1.5rem;
  }

  .page-faq .faq-q {
    padding: 1.15rem 1rem 1.15rem 0.5rem;
    font-size: var(--step-5);
  }

  .page-faq .faq-a {
    padding: 0 1.5rem 1.5rem 3.4rem;
  }

  .page-faq .faq-a p {
    font-size: var(--step-4);
  }

  .page-faq .faq-next {
    padding: 2rem 2.25rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-nav__list a,
  .page-faq .faq-q,
  .page-faq .faq-q__sign::before,
  .page-faq .faq-q__sign::after,
  .page-faq .faq-item {
    transition: none;
  }
}