.page-faq {
  --pf-fg: var(--ivory);
  --pf-fg-2: var(--muted);
  --pf-surface: var(--ink-2);
  --pf-line: var(--hair);
  --pf-key: var(--amber);
  --pf-accent: var(--cyan);
  color: var(--pf-fg);
  font-family: var(--font-sans);
  padding-bottom: clamp(48px, 8vw, 96px);
}

.page-faq .pf-shell {
  padding-inline: clamp(16px, 4vw, 40px);
}

/* 面包屑 */
.page-faq .pf-crumbs {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: clamp(20px, 3vw, 32px);
  font-size: var(--fs-12);
  letter-spacing: 0.14em;
  color: var(--pf-fg-2);
}
.page-faq .pf-crumbs__link {
  color: var(--pf-accent);
  text-decoration: none;
}
.page-faq .pf-crumbs__link:hover,
.page-faq .pf-crumbs__link:focus-visible {
  text-decoration: underline;
}
.page-faq .pf-crumbs__sep {
  color: var(--haze);
}

/* 首屏 */
.page-faq .pf-hero {
  border-bottom: 1px solid var(--pf-line);
  padding-bottom: clamp(24px, 4vw, 44px);
  margin-bottom: clamp(28px, 4vw, 52px);
}
.page-faq .pf-hero__kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.3em;
  color: var(--pf-key);
}
.page-faq .pf-hero__title {
  margin: 14px 0 0;
  font-size: var(--fs-56);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: 0.01em;
  max-width: 18em;
}
.page-faq .pf-hero__grid {
  margin-top: clamp(18px, 2.6vw, 28px);
  display: grid;
  gap: 20px;
}
.page-faq .pf-hero__lede {
  margin: 0;
  font-size: var(--fs-16);
  line-height: 1.85;
  color: var(--pf-fg);
  max-width: 38em;
}
.page-faq .pf-hero__facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  font-size: var(--fs-14);
  color: var(--pf-fg-2);
}
.page-faq .pf-hero__fact {
  display: flex;
  align-items: baseline;
  gap: 8px;
}
.page-faq .pf-hero__num {
  font-family: var(--font-mono);
  font-size: var(--fs-28);
  font-weight: 700;
  color: var(--pf-key);
  font-variant-numeric: tabular-nums;
}

/* 左右分屏 */
.page-faq .pf-split {
  display: block;
}
.page-faq .pf-index {
  margin-bottom: clamp(28px, 4vw, 44px);
}
.page-faq .pf-index__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.3em;
  color: var(--pf-fg-2);
}
.page-faq .pf-index__list {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
}
.page-faq .pf-index__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 12px;
  background: var(--pf-surface);
  border-bottom: 2px solid transparent;
  color: var(--pf-fg-2);
  font-size: var(--fs-14);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}
.page-faq .pf-index__link:hover,
.page-faq .pf-index__link:focus-visible {
  color: var(--pf-fg);
  outline: 2px solid var(--pf-accent);
  outline-offset: -2px;
}
.page-faq .pf-index__link[data-active="true"] {
  color: var(--pf-fg);
  border-bottom-color: var(--pf-accent);
}
.page-faq .pf-index__link[data-active="true"] .pf-index__num {
  color: var(--pf-accent);
}
.page-faq .pf-index__num {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  color: var(--pf-key);
  font-variant-numeric: tabular-nums;
  transition: color 0.2s var(--ease);
}
.page-faq .pf-index__foot {
  margin: 12px 0 0;
  font-size: var(--fs-12);
  line-height: 1.7;
  color: var(--pf-fg-2);
  max-width: 22em;
}

/* 章节骨架 */
.page-faq .pf-section {
  padding-block: clamp(32px, 5vw, 60px);
  border-top: 1px solid var(--pf-line);
}
.page-faq .pf-body > .pf-section:first-child {
  border-top: 0;
  padding-top: 0;
}
.page-faq .pf-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  flex-wrap: wrap;
}
.page-faq .pf-num {
  font-family: var(--font-mono);
  font-size: var(--fs-28);
  font-weight: 700;
  color: var(--pf-key);
  font-variant-numeric: tabular-nums;
  line-height: 1;
}
.page-faq .pf-title {
  margin: 0;
  font-size: var(--fs-28);
  font-weight: 800;
  line-height: 1.28;
  letter-spacing: 0.01em;
}
.page-faq .pf-lede {
  margin: 14px 0 0;
  font-size: var(--fs-16);
  line-height: 1.85;
  color: var(--pf-fg-2);
  max-width: 42em;
}
.page-faq .pf-lede--tight {
  margin-top: 20px;
}
.page-faq .pf-link {
  color: var(--pf-accent);
  text-decoration: underline;
  text-underline-offset: 3px;
  word-break: break-word;
}
.page-faq .pf-link:hover,
.page-faq .pf-link:focus-visible {
  color: var(--pf-key);
}

/* 图片 */
.page-faq .pf-media {
  margin: 22px 0 0;
  border: 1px solid var(--pf-line);
  background: var(--pf-surface);
}
.page-faq .pf-media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}
.page-faq .pf-media__cap {
  display: block;
  padding: 10px 14px;
  border-top: 1px solid var(--pf-line);
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.06em;
  color: var(--pf-fg-2);
}

/* 十二章列表 */
.page-faq .pf-chapters {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--pf-line);
  border: 1px solid var(--pf-line);
}
.page-faq .pf-chapters__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 6px 12px;
  align-items: start;
  padding: 14px 16px;
  background: var(--pf-surface);
}
.page-faq .pf-chapters__no {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  color: var(--pf-key);
  padding-top: 4px;
  font-variant-numeric: tabular-nums;
}
.page-faq .pf-chapters__main {
  display: block;
}
.page-faq .pf-chapters__name {
  display: block;
  font-size: var(--fs-16);
  font-weight: 700;
}
.page-faq .pf-chapters__desc {
  display: block;
  margin-top: 6px;
  font-size: var(--fs-14);
  line-height: 1.7;
  color: var(--pf-fg-2);
}
.page-faq .pf-chapters__count {
  grid-column: 2;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  color: var(--pf-fg-2);
  font-variant-numeric: tabular-nums;
}

/* 纸面阅读区 */
.page-faq .pf-paper {
  --pf-fg: var(--ink-2);
  --pf-fg-2: #4C5069;
  --pf-surface: #FFF9EF;
  --pf-line: var(--paper-2);
  --pf-key: #8F5A14;
  --pf-accent: var(--cyan-deep);
  background: var(--paper);
  border: 1px solid var(--paper-2);
  border-top: 1px solid var(--paper-2);
  padding: clamp(22px, 4vw, 44px) clamp(18px, 3vw, 40px);
  color: var(--pf-fg);
}
.page-faq .pf-paper .pf-num {
  color: var(--pf-key);
}
.page-faq .pf-paper .pf-index__link {
  background: transparent;
}

/* 三步操作 */
.page-faq .pf-steps {
  list-style: none;
  margin: 24px 0 0;
  padding: 0 0 0 20px;
  border-left: 1px solid var(--pf-line);
}
.page-faq .pf-steps--tight {
  margin-top: 20px;
}
.page-faq .pf-steps__item {
  position: relative;
  padding-bottom: 22px;
}
.page-faq .pf-steps__item:last-child {
  padding-bottom: 0;
}
.page-faq .pf-steps__item::before {
  content: "";
  position: absolute;
  left: -25px;
  top: 7px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--pf-accent);
}
.page-faq .pf-steps__t {
  margin: 0;
  font-size: var(--fs-20);
  font-weight: 800;
  line-height: 1.4;
}
.page-faq .pf-steps__no {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  color: var(--pf-key);
  margin-right: 10px;
}
.page-faq .pf-steps__p {
  margin: 8px 0 0;
  font-size: var(--fs-14);
  line-height: 1.85;
  color: var(--pf-fg-2);
  max-width: 40em;
}

/* 八个一级分类 */
.page-faq .pf-cats {
  margin-top: 28px;
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}
.page-faq .pf-cats__item {
  border-left: 3px solid var(--pf-accent);
  padding: 4px 0 4px 14px;
}
.page-faq .pf-cats__name {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-size: var(--fs-16);
  font-weight: 800;
}
.page-faq .pf-cats__idx {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  color: var(--pf-key);
  font-variant-numeric: tabular-nums;
}
.page-faq .pf-cats__desc {
  margin: 6px 0 0;
  font-size: var(--fs-14);
  line-height: 1.7;
  color: var(--pf-fg-2);
}

/* 时间戳卡片 */
.page-faq .pf-stampgrid {
  margin-top: 24px;
  display: grid;
  gap: 1px;
  background: var(--pf-line);
  border: 1px solid var(--pf-line);
}
.page-faq .pf-stampcard {
  background: var(--pf-surface);
  padding: 18px 18px 20px;
}
.page-faq .pf-stampcard__k {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.2em;
  color: var(--pf-accent);
}
.page-faq .pf-stampcard__t {
  margin: 12px 0 0;
  font-size: var(--fs-20);
  font-weight: 800;
}
.page-faq .pf-stampcard__p {
  margin: 10px 0 0;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--pf-fg-2);
}
.page-faq .pf-path {
  margin: 20px 0 0;
  padding: 14px 16px;
  background: var(--ink);
  border: 1px solid var(--pf-line);
  font-family: var(--font-mono);
  font-size: var(--fs-14);
  color: var(--ivory);
  overflow-x: auto;
  white-space: nowrap;
}

/* 常见情况 */
.page-faq .pf-cases {
  margin-top: 24px;
  display: grid;
  gap: 12px;
}
.page-faq .pf-cases__item {
  padding: 14px 16px;
  border: 1px solid var(--pf-line);
  background: var(--pf-surface);
}
.page-faq .pf-cases__tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.14em;
  color: var(--pf-key);
  margin-bottom: 6px;
}
.page-faq .pf-cases__p {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--pf-fg-2);
}

/* 筛选 */
.page-faq .pf-filterbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-top: 22px;
}
.page-faq .pf-filter__btn {
  font-family: var(--font-sans);
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  padding: 7px 14px;
  border: 1px solid var(--pf-line);
  border-radius: 999px;
  background: transparent;
  color: var(--pf-fg-2);
  cursor: pointer;
  transition: color 0.2s var(--ease), background 0.2s var(--ease), border-color 0.2s var(--ease);
}
.page-faq .pf-filter__btn:hover,
.page-faq .pf-filter__btn:focus-visible {
  color: var(--pf-fg);
  border-color: var(--pf-accent);
  outline: 2px solid var(--pf-accent);
  outline-offset: 2px;
}
.page-faq .pf-filter__btn.is-active,
.page-faq .pf-filter__btn[aria-pressed="true"] {
  background: var(--pf-accent);
  border-color: var(--pf-accent);
  color: var(--ink);
}
.page-faq .pf-filter__count {
  margin-left: auto;
  font-size: var(--fs-12);
  color: var(--pf-fg-2);
}

/* 折叠问答 */
.page-faq .pf-faq {
  margin-top: 18px;
  display: grid;
  gap: 12px;
}
.page-faq .pf-faq__item {
  background: var(--pf-surface);
  border: 1px solid var(--pf-line);
  border-left: 1px solid var(--pf-line);
  transition: border-color 0.25s var(--ease);
}
.page-faq .pf-faq__item[open] {
  border-left: 1px solid var(--pf-accent);
}
.page-faq .pf-faq__summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 12px;
  align-items: start;
  padding: 15px 16px;
  cursor: pointer;
  list-style: none;
  font-size: var(--fs-16);
  font-weight: 700;
  line-height: 1.6;
}
.page-faq .pf-faq__summary::-webkit-details-marker {
  display: none;
}
.page-faq .pf-faq__summary:focus-visible {
  outline: 2px solid var(--pf-accent);
  outline-offset: -2px;
}
.page-faq .pf-faq__no {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  color: var(--pf-key);
  padding-top: 5px;
  font-variant-numeric: tabular-nums;
}
.page-faq .pf-faq__sign {
  position: relative;
  width: 16px;
  height: 16px;
  margin-top: 4px;
}
.page-faq .pf-faq__sign::before,
.page-faq .pf-faq__sign::after {
  content: "";
  position: absolute;
  background: var(--pf-accent);
  transition: transform 0.2s var(--ease), opacity 0.2s var(--ease);
}
.page-faq .pf-faq__sign::before {
  left: 0;
  top: 7px;
  width: 16px;
  height: 1px;
}
.page-faq .pf-faq__sign::after {
  left: 7px;
  top: 0;
  width: 1px;
  height: 16px;
}
.page-faq .pf-faq__item[open] .pf-faq__sign::after {
  transform: scaleY(0);
  opacity: 0;
}
.page-faq .pf-faq__body {
  padding: 0 16px 18px 16px;
  border-top: 1px solid var(--pf-line);
}
.page-faq .pf-faq__concl {
  margin: 14px 0 0;
  font-size: var(--fs-14);
  font-weight: 700;
  line-height: 1.75;
  color: var(--pf-fg);
}
.page-faq .pf-faq__steps {
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
  counter-reset: pf-fq;
}
.page-faq .pf-faq__steps li {
  counter-increment: pf-fq;
  position: relative;
  padding-left: 30px;
  margin-top: 8px;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--pf-fg-2);
}
.page-faq .pf-faq__steps li::before {
  content: counter(pf-fq);
  position: absolute;
  left: 0;
  top: 2px;
  width: 20px;
  height: 20px;
  display: grid;
  place-items: center;
  border: 1px solid var(--pf-line);
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  color: var(--pf-key);
  line-height: 1;
}

/* 求助区 */
.page-faq .pf-help {
  margin-top: 24px;
  display: grid;
  gap: 18px;
}
.page-faq .pf-help__req {
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-faq .pf-help__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 12px;
  padding: 14px 0;
  border-bottom: 1px solid var(--pf-line);
}
.page-faq .pf-help__item:first-child {
  border-top: 1px solid var(--pf-line);
}
.page-faq .pf-help__idx {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  color: var(--pf-key);
  padding-top: 4px;
}
.page-faq .pf-help__k {
  display: block;
  font-size: var(--fs-16);
  font-weight: 800;
}
.page-faq .pf-help__p {
  margin: 6px 0 0;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--pf-fg-2);
}
.page-faq .pf-help__box {
  border: 1px solid var(--pf-line);
  background: var(--pf-surface);
  padding: 18px;
}
.page-faq .pf-help__boxlabel {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.24em;
  color: var(--pf-key);
}
.page-faq .pf-help__line {
  margin: 0 0 10px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 12px;
  align-items: baseline;
  font-size: var(--fs-14);
}
.page-faq .pf-help__k2 {
  color: var(--pf-fg-2);
  font-size: var(--fs-12);
  letter-spacing: 0.1em;
}
.page-faq .pf-help__note {
  margin: 14px 0 0;
  font-size: var(--fs-12);
  line-height: 1.8;
  color: var(--pf-fg-2);
}
.page-faq .pf-actions {
  margin-top: 24px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.page-faq .pf-btn {
  font-size: var(--fs-14);
}
.page-faq .pf-copy {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
}

/* 断点 */
@media (min-width: 640px) {
  .page-faq .pf-chapters__item {
    grid-template-columns: auto minmax(0, 1fr) auto;
  }
  .page-faq .pf-chapters__count {
    grid-column: 3;
    padding-top: 4px;
  }
  .page-faq .pf-cases {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-faq .pf-hero__grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 0.6fr);
    align-items: end;
    gap: 32px;
  }
  .page-faq .pf-hero__facts {
    flex-direction: column;
    gap: 8px;
    align-items: flex-start;
  }
  .page-faq .pf-chapters {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-faq .pf-stampgrid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-faq .pf-help {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 24px;
  }
}

@media (min-width: 1024px) {
  .page-faq .pf-split {
    display: grid;
    grid-template-columns: 26% minmax(0, 1fr);
    gap: clamp(24px, 3vw, 48px);
    align-items: start;
  }
  .page-faq .pf-index {
    position: sticky;
    top: 88px;
    margin-bottom: 0;
  }
  .page-faq .pf-index__list {
    margin-top: 14px;
    border-top: 1px solid var(--pf-line);
  }
  .page-faq .pf-index__item {
    border-bottom: 1px solid var(--pf-line);
  }
  .page-faq .pf-index__link {
    background: transparent;
    border-bottom: 0;
    border-left: 2px solid transparent;
    padding: 11px 6px 11px 12px;
    white-space: normal;
  }
  .page-faq .pf-index__link[data-active="true"] {
    border-left-color: var(--pf-accent);
    background: linear-gradient(90deg, rgba(69, 224, 230, 0.09), transparent 80%);
  }
}

@media (min-width: 1200px) {
  .page-faq .pf-chapters {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 1023px) {
  .page-faq .pf-index__list {
    display: flex;
    gap: 8px;
    overflow-x: auto;
    padding-bottom: 6px;
  }
  .page-faq .pf-index__item {
    flex: 0 0 auto;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .pf-faq__sign::before,
  .page-faq .pf-faq__sign::after,
  .page-faq .pf-index__link,
  .page-faq .pf-faq__item,
  .page-faq .pf-filter__btn {
    transition: none;
  }
}