.page-faq {
  --faq-rail-w: 264px;
  --faq-gap: 28px;
  color: var(--paper);
}
.page-faq .breadcrumbs { padding-top: 18px; }
.page-faq .bc-link { color: var(--cyan); text-decoration: none; }
.page-faq .bc-link:hover { text-decoration: underline; }
.page-faq .bc-sep,
.page-faq .bc-item span { color: var(--muted); }

/* ------- 首屏 ------- */
.page-faq .faq-hero {
  position: relative;
  margin: 18px 0 0;
  padding: clamp(22px, 3.6vw, 44px);
  border: 1px solid var(--line);
  border-left: 6px solid var(--cyan);
  background-color: var(--ink-2);
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 44px 44px;
  box-shadow: var(--shadow-hard);
  overflow: hidden;
}
.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  right: -40px;
  top: -40px;
  width: 160px;
  height: 160px;
  background: var(--amber);
  opacity: .12;
  transform: rotate(45deg);
  pointer-events: none;
}
.page-faq .faq-kicker {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--amber);
}
.page-faq .faq-hero h1 {
  margin: 0;
  max-width: 22ch;
  font-family: var(--font-head);
  font-size: clamp(26px, 4.6vw, 44px);
  line-height: 1.24;
  letter-spacing: .03em;
  color: var(--paper);
}
.page-faq .faq-lede {
  margin: 18px 0 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--muted);
}
.page-faq .faq-hero__stats {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  margin-top: 26px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}
.page-faq .faq-stat {
  display: flex;
  align-items: baseline;
  gap: 10px;
}
.page-faq .faq-stat__num {
  font-family: var(--font-mono);
  font-size: 28px;
  line-height: 1;
  color: var(--cyan);
}
.page-faq .faq-stat__lb {
  font-size: 13px;
  color: var(--muted);
  letter-spacing: .04em;
}

/* ------- 双栏骨架 ------- */
.page-faq .faq-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--faq-gap);
  margin: 32px 0 56px;
}

/* ------- 左侧目录 ------- */
.page-faq .faq-toc {
  border: 1px solid var(--line);
  background: var(--ink-2);
  align-self: start;
}
.page-faq .faq-toc__head {
  margin: 0;
  padding: 12px 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--amber);
  border-bottom: 1px solid var(--line);
}
.page-faq .faq-toc__link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 13px 16px;
  border-bottom: 1px solid var(--line);
  border-left: 3px solid transparent;
  color: var(--paper);
  font-size: 15px;
  text-decoration: none;
  transition: background var(--ease), border-color var(--ease), color var(--ease);
}
.page-faq .faq-toc__no {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--muted);
  letter-spacing: .08em;
}
.page-faq .faq-toc__link:hover,
.page-faq .faq-toc__link:focus-visible {
  background: rgba(53, 240, 208, .09);
  border-left-color: var(--cyan);
  color: var(--cyan);
  outline: none;
}
.page-faq .faq-toc__link:hover .faq-toc__no,
.page-faq .faq-toc__link:focus-visible .faq-toc__no { color: var(--amber); }
.page-faq .faq-toc__tail {
  margin: 0;
  padding: 14px 16px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

/* ------- 右栏内容 ------- */
.page-faq .faq-body { min-width: 0; }
.page-faq .faq-group {
  scroll-margin-top: calc(var(--head-h) + 80px);
  margin-bottom: 44px;
}
.page-faq .faq-group:last-child { margin-bottom: 0; }
.page-faq .faq-group__title {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin: 0 0 18px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--line);
  font-family: var(--font-head);
  font-size: clamp(19px, 2.6vw, 24px);
  letter-spacing: .06em;
  color: var(--paper);
}
.page-faq .faq-group__no {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--cyan);
}

/* ------- 图片 ------- */
.page-faq .faq-figure {
  margin: 0 0 18px;
  border: 1px solid var(--line);
  background: var(--ink-2);
  box-shadow: var(--shadow-hard);
}
.page-faq .faq-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}
.page-faq .faq-figure figcaption {
  padding: 10px 14px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--muted);
}

/* ------- 折叠问答 ------- */
.page-faq .faq-item {
  border: 1px solid var(--line);
  border-left: 4px solid var(--line);
  background: var(--ink-2);
  margin-bottom: 10px;
  transition: border-color var(--ease), box-shadow var(--ease);
}
.page-faq .faq-item:hover { border-left-color: var(--cyan); }
.page-faq .faq-item[open] {
  border-left-color: var(--amber);
  box-shadow: var(--shadow-hard);
}
.page-faq .faq-item > summary {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
  font-size: 16px;
  line-height: 1.6;
  color: var(--paper);
  transition: background var(--ease), color var(--ease);
}
.page-faq .faq-item > summary::-webkit-details-marker { display: none; }
.page-faq .faq-item > summary:hover { background: rgba(53, 240, 208, .07); }
.page-faq .faq-item > summary:focus-visible {
  outline: 1px solid var(--cyan);
  outline-offset: -2px;
}
.page-faq .faq-chev {
  flex: 0 0 auto;
  margin-top: 8px;
  width: 0;
  height: 0;
  border-left: 7px solid var(--cyan);
  border-top: 5px solid transparent;
  border-bottom: 5px solid transparent;
  transition: transform var(--ease), border-left-color var(--ease);
}
.page-faq .faq-item[open] .faq-chev {
  transform: rotate(90deg);
  border-left-color: var(--amber);
}
.page-faq .faq-q { flex: 1 1 auto; }
.page-faq .faq-a {
  padding: 0 16px 16px 35px;
  border-top: 1px solid var(--line);
  padding-top: 14px;
}
.page-faq .faq-a p {
  margin: 0;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}
.page-faq .faq-a a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 240, 208, .4);
}
.page-faq .faq-a a:hover { border-bottom-color: var(--cyan); }
.page-faq .faq-mark {
  display: inline-block;
  padding: 0 5px;
  background: rgba(255, 154, 60, .18);
  color: var(--amber);
  font-family: var(--font-mono);
  font-size: 14px;
  border-radius: 2px;
}

/* ------- 桌面 ------- */
@media (min-width: 900px) {
  .page-faq .faq-hero__stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0;
  }
  .page-faq .faq-stat {
    flex-direction: column;
    gap: 6px;
    padding: 0 18px;
    border-left: 1px solid var(--line);
  }
  .page-faq .faq-stat:first-child { padding-left: 0; border-left: 0; }
  .page-faq .faq-grid {
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
    gap: 40px;
  }
  .page-faq .faq-toc {
    position: sticky;
    top: calc(var(--head-h) + 24px);
  }
  .page-faq .faq-a { padding-left: 43px; }
}

@media (min-width: 1200px) {
  .page-faq { --faq-rail-w: 300px; }
}