.page-faq {
  --faq-line: var(--ink-700);
  --faq-panel: var(--ink-800);
  --faq-glow: rgba(79, 209, 217, 0.08);
  display: block;
  padding-bottom: 64px;
}

/* ---------- 面包屑 ---------- */
.page-faq .faq-crumb {
  padding-top: 20px;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding: 26px 0 36px;
  border-bottom: 1px solid var(--faq-line);
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 1px;
  background: linear-gradient(90deg, var(--glacier-500), rgba(79, 209, 217, 0) 58%);
}

.page-faq .faq-hero h1 {
  margin: 12px 0 16px;
  font-size: clamp(28px, 7.2vw, 52px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  font-weight: 900;
  max-width: 16ch;
}

.page-faq .faq-hero__lede {
  margin: 0;
  max-width: 46ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--text-muted);
}

.page-faq .faq-hero__stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px 14px;
  margin: 26px 0 0;
  padding: 0;
}

.page-faq .faq-hero__stats > div {
  padding-left: 12px;
  border-left: 1px solid var(--faq-line);
}

.page-faq .faq-hero__stats dt {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

.page-faq .faq-hero__stats dd {
  margin: 4px 0 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(20px, 4.6vw, 30px);
  line-height: 1.2;
  color: var(--glacier-500);
}

/* ---------- 两栏骨架 ---------- */
.page-faq .faq-scope {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  padding-top: 32px;
}

.page-faq .faq-flow {
  display: flex;
  flex-direction: column;
  gap: 36px;
  min-width: 0;
}

/* ---------- 索引栏 ---------- */
.page-faq .faq-rail {
  position: relative;
  padding: 12px;
  background: var(--faq-panel);
  border: 1px solid var(--faq-line);
  min-width: 0;
}

.page-faq .faq-rail__cap {
  display: none;
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--text-muted);
}

.page-faq .faq-rail__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 4px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.page-faq .faq-rail__list li {
  flex: 0 0 auto;
}

.page-faq .index-rail__link {
  display: block;
  white-space: nowrap;
  padding: 8px 11px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.02em;
  text-decoration: none;
  color: var(--text-muted);
  background: rgba(11, 27, 46, 0.65);
  border: 1px solid var(--faq-line);
  border-left: 2px solid transparent;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease), background 0.18s var(--ease);
}

.page-faq .index-rail__link:hover {
  color: var(--glacier-300);
}

.page-faq .index-rail__link[aria-current="true"] {
  color: var(--glacier-300);
  border-left-color: var(--glacier-500);
  background: var(--faq-glow);
}

/* ---------- 筛选条 ---------- */
.page-faq .faq-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-bottom: 4px;
}

.page-faq .filter-chip {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  padding: 7px 13px;
  color: var(--text-muted);
  background: transparent;
  border: 1px solid var(--faq-line);
  cursor: pointer;
  transition: color 0.18s var(--ease), background 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-faq .filter-chip:hover {
  color: var(--glacier-300);
  border-color: rgba(79, 209, 217, 0.5);
}

.page-faq .filter-chip[aria-pressed="true"],
.page-faq .filter-chip.is-active {
  color: var(--ink-900);
  background: var(--glacier-500);
  border-color: var(--glacier-500);
}

/* ---------- 章节 ---------- */
.page-faq .faq-block {
  scroll-margin-top: 96px;
  min-width: 0;
}

.page-faq .faq-block__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--faq-line);
}

.page-faq .faq-block__no {
  font-size: 14px;
  letter-spacing: 0.1em;
  color: var(--glacier-500);
}

.page-faq .faq-block h2 {
  margin: 0;
  font-size: clamp(19px, 3.6vw, 27px);
  line-height: 1.3;
  letter-spacing: -0.01em;
  font-weight: 800;
}

.page-faq .faq-block > .prose {
  margin: 14px 0 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-muted);
}

.page-faq .faq-block a {
  color: var(--glacier-300);
  text-decoration: none;
  border-bottom: 1px solid rgba(79, 209, 217, 0.35);
}

.page-faq .faq-block a:hover {
  border-bottom-color: var(--glacier-500);
}

/* ---------- 图 ---------- */
.page-faq .faq-figure {
  margin: 20px 0 0;
  background: var(--faq-panel);
  border: 1px solid var(--faq-line);
}

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

.page-faq .faq-figure--narrow {
  max-width: 520px;
}

@media (min-width: 720px) {
  .page-faq .faq-figure--narrow {
    max-width: 560px;
  }
}

/* ---------- 判断维度条 ---------- */
.page-faq .faq-bars {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-faq .faq-bar {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 7px;
  padding: 12px 14px;
  background: var(--faq-panel);
  border: 1px solid var(--faq-line);
  border-left: 2px solid var(--faq-line);
  transition: border-color 0.18s var(--ease);
}

.page-faq .faq-bar:hover {
  border-left-color: var(--glacier-500);
}

.page-faq .faq-bar__label {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
}

.page-faq .faq-bar__track {
  display: block;
  height: 8px;
  background: rgba(26, 58, 86, 0.75);
  overflow: hidden;
}

.page-faq .faq-bar__track i {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--glacier-500), var(--glacier-300));
}

.page-faq .faq-bar[data-level="5"] .faq-bar__track i { width: 100%; }
.page-faq .faq-bar[data-level="4"] .faq-bar__track i { width: 82%; }
.page-faq .faq-bar[data-level="3"] .faq-bar__track i { width: 64%; }
.page-faq .faq-bar[data-level="2"] .faq-bar__track i { width: 46%; }
.page-faq .faq-bar[data-level="1"] .faq-bar__track i { width: 28%; }

.page-faq .faq-bar__note {
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--text-muted);
}

@media (min-width: 720px) {
  .page-faq .faq-bar {
    grid-template-columns: 150px 90px minmax(0, 1fr);
    align-items: center;
    gap: 14px;
  }
}

/* ---------- 问答组 ---------- */
.page-faq .faq-group {
  display: grid;
  gap: 10px;
  margin-top: 18px;
}

.page-faq .faq-item {
  background: var(--faq-panel);
  border: 1px solid var(--faq-line);
  transition: border-color 0.18s var(--ease);
}

.page-faq .faq-item:hover {
  border-color: rgba(79, 209, 217, 0.45);
}

.page-faq .faq-item[hidden] {
  display: none;
}

.page-faq .faq-item__h {
  margin: 0;
  font-size: inherit;
  font-weight: inherit;
}

.page-faq .faq-q {
  position: relative;
  width: 100%;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: start;
  gap: 12px;
  padding: 15px 16px;
  background: transparent;
  border: 0;
  color: var(--text-primary);
  font-family: inherit;
  font-size: 15px;
  line-height: 1.6;
  text-align: left;
  cursor: pointer;
}

.page-faq .faq-q::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 1px;
  background: var(--glacier-500);
  transition: width 0.18s var(--ease);
}

.page-faq .faq-q:hover::after,
.page-faq .faq-q:focus-visible::after {
  width: 40px;
}

.page-faq .disclosure__index {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--glacier-500);
  padding-top: 2px;
}

.page-faq .faq-q__text {
  font-weight: 600;
  min-width: 0;
  word-break: break-word;
}

.page-faq .disclosure__icon {
  flex: none;
  width: 9px;
  height: 9px;
  margin-top: 7px;
  border-right: 1.5px solid var(--glacier-500);
  border-bottom: 1.5px solid var(--glacier-500);
  transform: rotate(45deg);
  transition: transform 0.22s var(--ease);
}

.page-faq .disclosure__toggle[aria-expanded="true"] .disclosure__icon {
  transform: rotate(-135deg);
}

.page-faq .faq-a {
  margin: 0 16px 16px;
  padding-top: 12px;
  border-top: 1px solid var(--faq-line);
}

.page-faq .faq-a p {
  margin: 0 0 8px;
  max-width: 44em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-muted);
}

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

.page-faq .faq-k {
  font-family: var(--font-mono);
  font-size: 0.96em;
  color: var(--glacier-300);
}

/* ---------- 图例 ---------- */
.page-faq .faq-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 20px;
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--text-muted);
}

.page-faq .faq-legend .legend__item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

/* ---------- 横向主题带 ---------- */
.page-faq .faq-band {
  margin: 0;
}

.page-faq .faq-band .band__inner {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  align-items: baseline;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.7;
  letter-spacing: 0.01em;
  color: var(--glacier-300);
}

/* ---------- 结尾导航 ---------- */
.page-faq .faq-more__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

/* ---------- 桌面布局 ---------- */
@media (min-width: 960px) {
  .page-faq .faq-scope {
    grid-template-columns: 216px minmax(0, 1fr);
    gap: 40px;
    padding-top: 44px;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: 96px;
    padding: 14px;
  }

  .page-faq .faq-rail__cap {
    display: block;
  }

  .page-faq .faq-rail__list {
    display: block;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-faq .faq-rail__list li + li {
    margin-top: 2px;
  }

  .page-faq .index-rail__link {
    white-space: normal;
    background: transparent;
    border-color: transparent;
    border-left: 2px solid transparent;
  }

  .page-faq .index-rail__link[aria-current="true"] {
    border-left-color: var(--glacier-500);
  }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-faq .index-rail__link,
  .page-faq .filter-chip,
  .page-faq .faq-item,
  .page-faq .faq-q::after,
  .page-faq .disclosure__icon,
  .page-faq .faq-bar {
    transition: none;
  }
}