.page-faq {
  --faq-line-soft: rgba(230, 234, 242, 0.10);
  --faq-ink-soft: rgba(26, 20, 16, 0.55);
}

/* ---------- 面包屑 ---------- */
.page-faq .breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 20px 0 0;
  font-size: 13px;
  font-family: var(--font-mono);
}
.page-faq .breadcrumb-item {
  color: var(--muted);
  text-decoration: none;
}
.page-faq .breadcrumb-item[aria-current="page"] {
  color: var(--fg);
}
.page-faq a.breadcrumb-item:hover {
  color: var(--cyan);
}
.page-faq .breadcrumb-sep {
  color: var(--line-2);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding: 36px 0 34px;
  border-bottom: 1px solid var(--line);
  background:
    linear-gradient(90deg, var(--faq-line-soft) 1px, transparent 1px) 0 0 / 96px 100%,
    radial-gradient(130% 150% at 84% -30%, rgba(79, 227, 208, 0.16), transparent 62%),
    var(--bg);
}
.page-faq .faq-eyebrow {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}
.page-faq h1 {
  margin: 0 0 18px;
  max-width: 24ch;
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: clamp(27px, 6vw, 44px);
  line-height: 1.22;
  letter-spacing: -0.02em;
  color: var(--fg);
}
.page-faq .faq-lead {
  margin: 0 0 18px;
  max-width: 62ch;
  font-size: 16.5px;
  line-height: 1.75;
  color: var(--fg);
}
.page-faq .faq-meta {
  margin: 0;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--muted);
}

/* ---------- 顶部主题索引带 ---------- */
.page-faq .index-band {
  background: var(--panel-deep);
  border-bottom: 1px solid var(--line);
}
.page-faq .index-band-inner {
  display: flex;
  flex-wrap: wrap;
}
.page-faq .index-item {
  flex: 1 1 50%;
  min-width: 0;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  padding: 15px 16px;
  border-top: 1px solid var(--line);
  border-right: 1px solid var(--line);
  text-decoration: none;
}
.page-faq .index-item:nth-child(-n + 2) {
  border-top: 0;
}
.page-faq .index-item:nth-child(even) {
  border-right: 0;
}
.page-faq .index-link {
  font-size: 14px;
  font-weight: 500;
  color: var(--fg);
}
.page-faq .index-count {
  flex: none;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--cyan);
}
.page-faq .index-item:hover .index-link {
  color: var(--cyan);
}

/* ---------- 主体两栏 ---------- */
.page-faq .faq-layout {
  padding: 36px 0 8px;
  row-gap: 40px;
}
.page-faq .faq-main {
  min-width: 0;
}
.page-faq .faq-aside {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

/* ---------- 分组 ---------- */
.page-faq .faq-group + .faq-group {
  margin-top: 34px;
  padding-top: 34px;
  border-top: 1px solid var(--line);
}
.page-faq .faq-group-head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 12px;
}
.page-faq .faq-num {
  flex: none;
  padding: 3px 7px;
  border: 1px solid var(--line-2);
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--orange);
}
.page-faq .faq-group-title {
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(20px, 3.4vw, 27px);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--fg);
}
.page-faq .faq-group-intro {
  margin: 0 0 14px;
  max-width: 58ch;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--muted);
}

/* ---------- 折叠问答 ---------- */
.page-faq .qa-list {
  border-top: 1px solid var(--line);
}
.page-faq .qa-item {
  border-bottom: 1px solid var(--line);
}
.page-faq .qa-item[open] {
  background: linear-gradient(90deg, rgba(79, 227, 208, 0.07), transparent 72%);
}
.page-faq .qa-item > summary {
  position: relative;
  padding: 17px 42px 17px 0;
  list-style: none;
  cursor: pointer;
  font-size: 16.5px;
  font-weight: 500;
  line-height: 1.6;
  color: var(--fg);
}
.page-faq .qa-item > summary::-webkit-details-marker {
  display: none;
}
.page-faq .qa-item > summary::after {
  content: "+";
  position: absolute;
  right: 6px;
  top: 15px;
  font-family: var(--font-mono);
  font-size: 19px;
  line-height: 1;
  color: var(--cyan);
}
.page-faq .qa-item[open] > summary {
  color: var(--cyan);
}
.page-faq .qa-item[open] > summary::after {
  content: "−";
}
.page-faq .qa-item > summary:focus-visible {
  outline: 1px solid var(--cyan);
  outline-offset: 2px;
}
.page-faq .qa-a {
  padding: 0 44px 20px 0;
}
.page-faq .qa-a p {
  margin: 0 0 10px;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--fg);
}
.page-faq .qa-a p:last-child {
  margin-bottom: 0;
}

/* ---------- 图片 ---------- */
.page-faq .figure {
  margin: 22px 0 0;
}
.page-faq .figure-media {
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--panel-deep);
}
.page-faq .figure-media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
}
.page-faq .figure-caption {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--muted);
}

/* ---------- 右侧速查 ---------- */
.page-faq .aside-block {
  border: 1px solid var(--line);
  background: var(--panel);
  padding: 22px 20px;
}
.page-faq .aside-block--glossary {
  background: var(--panel-deep);
}
.page-faq .faq-aside-title {
  margin: 0 0 14px;
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--fg);
}
.page-faq .aside-note {
  margin: 0 0 16px;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--muted);
}

.page-faq .segmented {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 14px;
}
.page-faq .segmented-tab {
  flex: 1 1 auto;
  min-width: 0;
  appearance: none;
  padding: 8px 10px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.3;
  text-align: center;
  cursor: pointer;
}
.page-faq .segmented-tab[aria-selected="true"] {
  border-color: var(--cyan);
  background: var(--cyan);
  color: var(--bg);
}
.page-faq .segmented-tab:focus-visible {
  outline: 1px solid var(--orange);
  outline-offset: 2px;
}
.page-faq .segmented-panel p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--fg);
}

.page-faq .glossary {
  margin: 18px 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}
.page-faq .glossary-row {
  display: grid;
  grid-template-columns: minmax(0, 92px) minmax(0, 1fr);
  gap: 10px;
  padding: 11px 0;
  border-bottom: 1px solid var(--line);
}
.page-faq .glossary-term {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--cyan);
}
.page-faq .glossary-def {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.68;
  color: var(--fg);
}

/* ---------- 底部延伸路径 ---------- */
.page-faq .path-layer {
  display: grid;
  grid-template-columns: 1fr;
  margin: 40px 0 56px;
  border-top: 1px solid var(--line-2);
}
.page-faq .path-item {
  display: block;
  padding: 20px 4px;
  border-bottom: 1px solid var(--line);
  text-decoration: none;
}
.page-faq .path-title {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 700;
  color: var(--fg);
}
.page-faq .path-desc {
  display: block;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}
.page-faq .path-item:hover .path-title {
  color: var(--cyan);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-faq .faq-hero {
    padding: 52px 0 44px;
  }
  .page-faq .index-item {
    flex: 1 1 170px;
    border-top: 0;
  }
  .page-faq .index-item:nth-child(even) {
    border-right: 1px solid var(--line);
  }
  .page-faq .index-item:last-child {
    border-right: 0;
  }
  .page-faq .path-layer {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-faq .path-item {
    padding: 22px 18px;
    border-right: 1px solid var(--line);
    border-bottom: 0;
  }
  .page-faq .path-item:last-child {
    border-right: 0;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-layout {
    padding: 48px 0 12px;
  }
  .page-faq .faq-aside {
    padding-left: 8px;
  }
  .page-faq .aside-block {
    padding: 24px 22px;
  }
}

@media (max-width: 899px) {
  .page-faq .faq-aside {
    margin-top: 4px;
  }
  .page-faq .qa-item > summary {
    padding-right: 34px;
    font-size: 16px;
  }
  .page-faq .qa-a {
    padding-right: 8px;
  }
  .page-faq .glossary-row {
    grid-template-columns: minmax(0, 80px) minmax(0, 1fr);
    gap: 8px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa-item[open] {
    background: none;
  }
}
</main>