.page-faq {
  background: var(--paper);
  color: var(--ink);
  padding-bottom: clamp(36px, 6vw, 76px);
}

.page-faq .faq-topbar {
  padding-top: 18px;
}

/* 首屏框景 */
.page-faq .faq-hero {
  padding-top: 14px;
}

.page-faq .faq-hero__frame {
  position: relative;
  border: 2px solid var(--ink);
  background:
    radial-gradient(circle at 1px 1px, rgba(28, 36, 31, 0.08) 1px, transparent 0) 0 0 / 18px 18px,
    var(--paper);
  box-shadow: var(--shadow-k);
  padding: clamp(24px, 4vw, 46px) clamp(16px, 3.4vw, 40px) clamp(20px, 3vw, 34px);
}

.page-faq .faq-hero__scale {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 8px;
  background: repeating-linear-gradient(90deg, var(--amber) 0 2px, transparent 2px 14px);
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-hero__top {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  justify-content: space-between;
  margin-top: 16px;
}

.page-faq .faq-hero h1 {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(27px, 6.2vw, 56px);
  line-height: 1.14;
  letter-spacing: -0.01em;
  margin: 14px 0 0;
  max-width: 20ch;
}

.page-faq .faq-hero .lede {
  margin: 14px 0 0;
  max-width: 46ch;
  color: var(--muted);
  line-height: 1.8;
}

.page-faq .faq-hero__quick {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  margin-top: 22px;
}

.page-faq .quick-link {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 12px 14px;
  border: 2px solid var(--ink);
  background: var(--kraft);
  box-shadow: 3px 3px 0 rgba(28, 36, 31, 0.16);
  color: var(--ink);
  text-decoration: none;
  transition: transform var(--t-fast), box-shadow var(--t-fast), background var(--t-fast);
}

.page-faq .quick-link:hover,
.page-faq .quick-link:focus-visible {
  transform: translate(-1px, -2px);
  box-shadow: 5px 5px 0 rgba(28, 36, 31, 0.2);
  background: var(--jade-pale);
}

.page-faq .quick-link__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--amber-deep);
}

.page-faq .quick-link__text {
  font-size: 15px;
  font-weight: 600;
}

.page-faq .faq-hero__stats {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 12px 0;
  margin: 22px 0 0;
  padding: 14px 0 0;
  border-top: 1px solid var(--line);
}

.page-faq .faq-hero__stats li {
  padding: 0 18px;
  border-left: 1px solid var(--line);
}

.page-faq .faq-hero__stats li:first-child {
  padding-left: 0;
  border-left: 0;
}

.page-faq .stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 600;
  line-height: 1.2;
  color: var(--jade-deep);
}

.page-faq .stat-label {
  font-size: 13px;
  color: var(--muted);
}

/* 桌面式双栏 */
.page-faq .faq-desk {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  padding-top: clamp(26px, 4vw, 42px);
}

.page-faq .faq-rail .toc {
  border: 2px solid var(--ink);
  background: var(--paper);
  box-shadow: 4px 4px 0 rgba(28, 36, 31, 0.14);
  padding: 14px;
}

.page-faq .faq-rail .toc__title {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  margin: 0 0 10px;
  color: var(--amber-deep);
}

.page-faq .faq-rail .toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 2px;
}

.page-faq .faq-rail .toc__link {
  display: block;
  padding: 8px 10px 8px 12px;
  border-left: 3px solid transparent;
  color: var(--ink);
  font-size: 14px;
  text-decoration: none;
  transition: background var(--t-fast), border-color var(--t-fast), color var(--t-fast);
}

.page-faq .faq-rail .toc__link:hover,
.page-faq .faq-rail .toc__link:focus-visible {
  background: var(--fog);
}

.page-faq .faq-rail .toc__link.is-active {
  border-left-color: var(--jade);
  background: var(--jade-pale);
  color: var(--jade-deep);
  font-weight: 600;
}

.page-faq .faq-rail__card {
  margin-top: 14px;
  border: 2px solid var(--ink);
  background: var(--kraft);
  box-shadow: 4px 4px 0 rgba(28, 36, 31, 0.14);
  padding: 14px;
}

.page-faq .faq-rail__title {
  margin: 0;
  font-size: 15px;
  font-weight: 700;
}

.page-faq .faq-rail__text {
  margin: 8px 0 12px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

.page-faq .faq-rail__card .btn {
  width: 100%;
}

/* 章节 */
.page-faq .faq-sec {
  padding-top: 20px;
  border-top: 2px solid var(--ink);
}

.page-faq .faq-sec + .faq-sec {
  margin-top: 42px;
}

.page-faq .faq-sec__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 14px;
}

.page-faq .faq-sec h2 {
  font-family: var(--font-head);
  font-size: clamp(21px, 3.6vw, 30px);
  font-weight: 700;
  line-height: 1.28;
  margin: 0;
  max-width: 26ch;
}

.page-faq .faq-sec__intro {
  margin: 12px 0 0;
  max-width: 54ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

/* 图片 */
.page-faq .faq-figure {
  margin: 0;
}

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

.page-faq .faq-figure__cap {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.03em;
  color: var(--muted);
}

/* 索引区 */
.page-faq .index-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
  margin-top: 20px;
}

.page-faq .cat-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-faq .cat {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 10px;
  align-items: baseline;
  padding: 12px 14px;
  border: 1px solid var(--line);
  background: var(--paper);
  color: var(--ink);
  text-decoration: none;
  transition: transform var(--t-fast), background var(--t-fast), border-color var(--t-fast);
}

.page-faq .cat:hover,
.page-faq .cat:focus-visible {
  transform: translateY(-2px);
  background: var(--jade-pale);
  border-color: var(--ink);
}

.page-faq .cat__num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--amber-deep);
}

.page-faq .cat__name {
  display: block;
  font-size: 15px;
  font-weight: 600;
}

.page-faq .cat__desc {
  display: block;
  margin-top: 2px;
  font-size: 13px;
  font-weight: 400;
  line-height: 1.6;
  color: var(--muted);
}

.page-faq .cat__count {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--jade-deep);
  white-space: nowrap;
}

/* 12 个入门条目 */
.page-faq .entry-group {
  margin-top: 22px;
}

.page-faq .entry-group__title {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 10px;
  font-size: 15px;
  font-weight: 700;
}

.page-faq .entry-group__title::before {
  content: "";
  display: block;
  width: 10px;
  height: 10px;
  flex: none;
  background: var(--jade);
}

.page-faq .entry-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
}

.page-faq .entry {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 10px;
  align-items: start;
  padding: 10px 12px;
  border-left: 3px solid var(--sage);
  background: var(--fog);
  font-size: 14px;
  line-height: 1.65;
}

.page-faq .entry__num {
  font-family: var(--font-mono);
  font-size: 11.5px;
  line-height: 1.5;
  padding: 1px 5px;
  color: var(--amber-deep);
  background: var(--paper);
  border: 1px solid var(--line);
}

/* 检索场景 */
.page-faq .search-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
  margin-top: 20px;
}

.page-faq .scene-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-faq .scene {
  display: grid;
  grid-template-columns: 36px minmax(0, 1fr);
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
}

.page-faq .scene:first-child {
  padding-top: 0;
}

.page-faq .scene:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-faq .scene__num {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  text-align: center;
  padding: 2px 0;
  height: fit-content;
  color: var(--jade-deep);
  background: var(--kraft);
  border: 2px solid var(--ink);
}

.page-faq .scene__title {
  margin: 0;
  font-size: 15px;
  font-weight: 700;
}

.page-faq .scene__text {
  margin: 4px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

.page-faq .flow {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-top: 18px;
  padding: 12px;
  border: 1px dashed var(--sage);
  background: var(--fog);
}

.page-faq .flow__node {
  font-family: var(--font-mono);
  font-size: 12px;
  padding: 6px 10px;
  color: var(--jade-deep);
  background: var(--jade-pale);
  border: 1px solid var(--jade);
}

.page-faq .flow__arrow {
  color: var(--sage);
  font-size: 13px;
}

/* 折叠问答 */
.page-faq .qa-stack {
  display: grid;
  gap: 12px;
  margin-top: 22px;
}

.page-faq .qa {
  border: 2px solid var(--ink);
  background: var(--kraft);
  box-shadow: 4px 4px 0 rgba(28, 36, 31, 0.14);
  transition: box-shadow var(--t-fast), transform var(--t-fast);
}

.page-faq .qa[open] {
  box-shadow: var(--shadow-k);
}

.page-faq .qa > summary {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 13px 15px;
  list-style: none;
  cursor: pointer;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.55;
}

.page-faq .qa > summary::-webkit-details-marker {
  display: none;
}

.page-faq .qa > summary:focus-visible {
  outline: 3px solid var(--jade);
  outline-offset: 2px;
}

.page-faq .qa[open] > summary {
  background: var(--jade-pale);
}

.page-faq .qa__no {
  flex: none;
  margin-top: 2px;
  padding: 1px 5px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--amber-deep);
  border: 1px solid var(--amber);
}

.page-faq .qa__mark {
  position: relative;
  flex: none;
  width: 14px;
  height: 14px;
  margin: 4px 0 0 auto;
}

.page-faq .qa__mark::before,
.page-faq .qa__mark::after {
  content: "";
  position: absolute;
  background: var(--ink);
  transition: transform var(--t-mid);
}

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

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

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

.page-faq .qa__body {
  padding: 12px 15px 15px;
  border-top: 1px solid var(--line);
}

.page-faq .qa__body p {
  margin: 0 0 10px;
  font-size: 14px;
  line-height: 1.75;
}

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

.page-faq .qa__body .tag {
  margin-right: 6px;
}

/* 升段记录 */
.page-faq .rank-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
  margin-top: 20px;
  align-items: center;
}

.page-faq .rank-chart {
  border: 2px solid var(--ink);
  background: var(--kraft);
  box-shadow: var(--shadow-k);
  padding: 16px;
}

.page-faq .rank-chart svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-faq .rank-chart .grid-line {
  stroke: rgba(28, 36, 31, 0.12);
  stroke-width: 1;
}

.page-faq .rank-chart .trace {
  fill: none;
  stroke: var(--jade);
  stroke-width: 2.5;
  stroke-linejoin: round;
  stroke-linecap: round;
}

.page-faq .rank-chart .node {
  fill: var(--paper);
  stroke: var(--jade-deep);
  stroke-width: 2;
}

.page-faq .rank-chart__axis {
  display: flex;
  justify-content: space-between;
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--muted);
}

.page-faq .steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-faq .steps li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 12px;
  font-size: 14px;
  line-height: 1.7;
}

.page-faq .steps__num {
  display: grid;
  place-items: center;
  width: 26px;
  height: 26px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  color: var(--jade-deep);
  background: var(--kraft);
  border: 2px solid var(--ink);
}

/* 版本对照 */
.page-faq .ver-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 20px;
}

.page-faq .ver-card {
  border: 2px solid var(--ink);
  background: var(--paper);
  box-shadow: 4px 4px 0 rgba(28, 36, 31, 0.14);
  padding: 15px;
}

.page-faq .ver-card--on {
  background: var(--jade-pale);
}

.page-faq .ver-card__title {
  margin: 0;
  font-size: 16px;
  font-weight: 700;
}

.page-faq .ver-card__sub {
  margin: 4px 0 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.05em;
  color: var(--amber-deep);
}

.page-faq .ver-card dl {
  margin: 12px 0 0;
  display: grid;
  gap: 8px;
}

.page-faq .ver-card dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--amber-deep);
}

.page-faq .ver-card dd {
  margin: 2px 0 0;
  font-size: 14px;
  line-height: 1.6;
}

/* 反馈准备 */
.page-faq .prep-list {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
}

.page-faq .prep {
  padding: 12px 14px;
  border: 1px solid var(--line);
  background: var(--fog);
  font-size: 14px;
  line-height: 1.65;
}

.page-faq .prep strong {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--amber-deep);
}

.page-faq .faq-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

.page-faq .faq-foot-note {
  margin: 20px 0 0;
  padding-left: 12px;
  border-left: 3px solid var(--coral);
  font-size: 13px;
  line-height: 1.75;
  color: var(--muted);
}

.page-faq .faq-foot-note a {
  color: var(--jade-deep);
  text-decoration: underline;
  text-underline-offset: 3px;
}

@media (min-width: 600px) {
  .page-faq .faq-hero__quick {
    grid-template-columns: 1fr 1fr;
  }

  .page-faq .faq-rail .toc__list {
    grid-template-columns: 1fr 1fr;
  }

  .page-faq .entry-list {
    grid-template-columns: 1fr 1fr;
    gap: 10px 14px;
  }

  .page-faq .prep-list {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 760px) {
  .page-faq .ver-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }

  .page-faq .qa__body {
    padding-left: 44px;
  }
}

@media (min-width: 860px) {
  .page-faq .index-grid {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    align-items: start;
    gap: 24px;
  }

  .page-faq .search-grid {
    grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
    align-items: start;
    gap: 26px;
  }

  .page-faq .rank-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 26px;
  }
}

@media (min-width: 1000px) {
  .page-faq .faq-hero__quick {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-faq .faq-desk {
    grid-template-columns: 232px minmax(0, 1fr);
    gap: 46px;
    align-items: start;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: 96px;
    align-self: start;
  }

  .page-faq .faq-rail .toc__list {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .quick-link,
  .page-faq .cat,
  .page-faq .qa,
  .page-faq .qa__mark::before,
  .page-faq .qa__mark::after,
  .page-faq .faq-rail .toc__link {
    transition: none;
  }

  .page-faq .quick-link:hover,
  .page-faq .quick-link:focus-visible,
  .page-faq .cat:hover,
  .page-faq .cat:focus-visible {
    transform: none;
  }
}