.page-faq {
  --faq-rule: rgba(159, 182, 204, 0.16);
  --faq-soft: #9FB6CC;
  background: var(--ink-900);
  color: var(--white);
  padding: 0 0 clamp(5rem, 10vw, 8rem);
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  padding: clamp(6rem, 13vw, 9.5rem) 0 0;
}

.page-faq .breadcrumb {
  margin-bottom: clamp(1.8rem, 4vw, 2.6rem);
}

.page-faq .faq-hero__head {
  max-width: 48rem;
}

.page-faq .faq-hero h1 {
  font-size: clamp(2rem, 6vw, 4.1rem);
  font-weight: 300;
  line-height: 1.04;
  letter-spacing: -0.02em;
  margin: 0.9rem 0 1.3rem;
}

.page-faq .faq-hero__lead {
  margin: 0;
  max-width: 34em;
  color: var(--faq-soft);
  line-height: 1.85;
}

.page-faq .faq-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem 2.6rem;
  margin: 2rem 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-hero__fact {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  color: var(--faq-soft);
}

.page-faq .faq-hero__fact b {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--lime);
}

.page-faq .faq-hero__media {
  margin: clamp(2.2rem, 6vw, 3.6rem) 0 0;
}

/* ---------- 双栏阅读区 ---------- */

.page-faq .faq-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(2.2rem, 5vw, 3rem);
  padding-top: clamp(3rem, 7vw, 5rem);
}

/* ---------- 主题目录 ---------- */

.page-faq .faq-toc {
  align-self: start;
}

.page-faq .faq-toc__list {
  list-style: none;
  margin: 0.9rem 0 0;
  padding: 0;
}

.page-faq .faq-toc__link {
  display: block;
  padding: 0.45rem 0 0.45rem 1rem;
  border-left: 1px solid var(--faq-rule);
  color: var(--faq-soft);
  font-size: 0.88rem;
  line-height: 1.5;
  text-decoration: none;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), padding-left 0.2s var(--ease);
}

.page-faq .faq-toc__link:hover,
.page-faq .faq-toc__link:focus-visible {
  color: var(--white);
  border-left-color: var(--cyan);
  padding-left: 1.35rem;
}

.page-faq .faq-toc__link:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 4px;
}

@media (max-width: 59.99rem) {
  .page-faq .faq-toc__list {
    display: flex;
    gap: 0.5rem;
    overflow-x: auto;
    padding-bottom: 0.6rem;
    scrollbar-width: thin;
  }

  .page-faq .faq-toc__item {
    flex: none;
  }

  .page-faq .faq-toc__link {
    padding: 0.42rem 0.95rem;
    border-left: 0;
    border: 1px solid var(--faq-rule);
    border-radius: var(--r-capsule);
    font-size: 0.82rem;
    white-space: nowrap;
  }

  .page-faq .faq-toc__link:hover,
  .page-faq .faq-toc__link:focus-visible {
    padding-left: 0.95rem;
    border-color: var(--cyan);
  }
}

/* ---------- 问答流 ---------- */

.page-faq .faq-stream {
  min-width: 0;
  max-width: 44rem;
}

.page-faq .faq-topic {
  scroll-margin-top: 6.5rem;
}

.page-faq .faq-topic + .faq-topic {
  margin-top: clamp(3.2rem, 7vw, 5.4rem);
}

.page-faq .faq-topic__title {
  font-size: clamp(1.4rem, 2.6vw, 1.95rem);
  font-weight: 400;
  letter-spacing: -0.01em;
  line-height: 1.25;
  margin: 0.55rem 0 1.3rem;
  color: var(--white);
  transition: color 0.25s var(--ease);
}

.page-faq .faq-topic:target .faq-topic__title {
  color: var(--cyan);
}

.page-faq .faq-topic__media {
  margin: 0 0 1.8rem;
}

/* 问答条目 */

.page-faq .faq-item {
  border: 0;
}

.page-faq .faq-item__q {
  display: flex;
  align-items: flex-start;
  gap: 0.85rem;
  padding: 1.05rem 0;
  list-style: none;
  cursor: pointer;
  font-size: 1rem;
  line-height: 1.6;
  color: var(--white);
  transition: color 0.2s var(--ease);
}

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

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

.page-faq .faq-item__q:hover {
  color: var(--cyan-soft);
}

.page-faq .faq-item__q:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 4px;
  border-radius: 6px;
}

.page-faq .faq-item__num {
  flex: none;
  padding-top: 0.3rem;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

.page-faq .faq-item__text {
  flex: 1 1 auto;
}

.page-faq .faq-item__sign {
  position: relative;
  flex: none;
  width: 13px;
  height: 13px;
  margin-top: 0.45rem;
}

.page-faq .faq-item__sign::before,
.page-faq .faq-item__sign::after {
  content: "";
  position: absolute;
  background: var(--cyan);
  border-radius: 2px;
}

.page-faq .faq-item__sign::before {
  left: 0;
  top: 5.5px;
  width: 13px;
  height: 2px;
}

.page-faq .faq-item__sign::after {
  left: 5.5px;
  top: 0;
  width: 2px;
  height: 13px;
  transition: transform 0.25s var(--ease);
}

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

.page-faq .faq-item__a {
  margin: 0 0 1.2rem;
  padding-left: 2.1rem;
  max-width: 40em;
  color: var(--faq-soft);
  font-size: 0.94rem;
  line-height: 1.85;
}

.page-faq .faq-item__a .num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  color: var(--white);
  padding: 0 0.1em;
}

/* ---------- 尾部悬浮联系胶囊 ---------- */

.page-faq .faq-dock {
  display: none;
}

@media (min-width: 60rem) {
  .page-faq .faq-dock {
    position: fixed;
    left: 50%;
    bottom: 1.4rem;
    z-index: 30;
    display: inline-flex;
    align-items: center;
    gap: 0.7rem;
    padding: 0.6rem 1.15rem;
    border: 1px solid var(--glass-line);
    border-radius: var(--r-capsule);
    background: var(--glass-strong);
    -webkit-backdrop-filter: blur(14px);
    backdrop-filter: blur(14px);
    color: var(--white);
    font-size: 0.84rem;
    letter-spacing: 0.02em;
    text-decoration: none;
    transform: translateX(-50%);
    transition: transform 0.25s var(--ease), background 0.25s var(--ease);
  }

  .page-faq .faq-dock:hover {
    background: rgba(36, 224, 210, 0.28);
    transform: translateX(-50%) translateY(-4px);
  }

  .page-faq .faq-dock:focus-visible {
    outline: 2px solid var(--cyan);
    outline-offset: 3px;
  }
}

.page-faq .faq-dock__dot {
  flex: none;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--lime);
  box-shadow: 0 0 10px var(--lime);
}

/* ---------- 桌面双栏 ---------- */

@media (min-width: 60rem) {
  .page-faq .faq-body {
    grid-template-columns: 15rem minmax(0, 1fr);
    gap: 4.5rem;
  }

  .page-faq .faq-toc {
    position: sticky;
    top: 7rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-toc__link,
  .page-faq .faq-item__q,
  .page-faq .faq-item__sign::after,
  .page-faq .faq-topic__title,
  .page-faq .faq-dock {
    transition: none;
  }
}