.page-faq {
  --faq-rail-w: 232px;
  --faq-rail-gap: 56px;
  --faq-hair: 1px solid var(--paper-200);
}

/* ---------- 首屏框景 ---------- */
.page-faq .faq-hero {
  margin: 22px 0 64px;
}

.page-faq .faq-hero__frame {
  position: relative;
  border: 1px solid var(--ink-900);
  border-top-width: 4px;
  padding: 30px 20px 22px;
  background: var(--paper-0);
}

.page-faq .faq-hero__frame::before {
  content: "";
  position: absolute;
  top: -4px;
  left: -1px;
  width: 40px;
  height: 40px;
  border-top: 3px solid var(--accent-600);
  border-left: 3px solid var(--accent-600);
  pointer-events: none;
}

.page-faq .faq-hero__frame::after {
  content: "";
  position: absolute;
  right: -1px;
  bottom: -1px;
  width: 22px;
  height: 22px;
  background: var(--ink-900);
  pointer-events: none;
}

.page-faq .faq-hero__kicker {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--ink-500);
  text-transform: uppercase;
}

.page-faq .faq-hero__kicker i {
  font-style: normal;
  color: var(--accent-600);
}

.page-faq .faq-hero h1 {
  margin: 0 0 18px;
  font-family: var(--font-serif);
  font-size: 26px;
  line-height: 1.35;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--ink-900);
  max-width: 22em;
}

.page-faq .faq-hero__lede,
.page-faq .faq-hero__scope {
  margin: 0 0 14px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-900);
  max-width: 44em;
}

.page-faq .faq-hero__scope {
  padding-left: 14px;
  border-left: 2px solid var(--accent-600);
  color: var(--ink-500);
  font-size: 14px;
}

.page-faq .faq-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

.page-faq .faq-hero__gauge {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  margin-top: 24px;
  border-top: var(--faq-hair);
  padding-top: 10px;
}

.page-faq .faq-hero__tick {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--ink-500);
  padding-right: 12px;
  margin-right: 12px;
  border-right: 1px solid var(--paper-200);
}

.page-faq .faq-hero__tick:last-child {
  border-right: 0;
  padding-right: 0;
  margin-right: 0;
}

/* ---------- 主体分栏 ---------- */
.page-faq .faq-layout {
  display: block;
  margin-bottom: 40px;
}

.page-faq .faq-rail {
  margin-bottom: 40px;
}

.page-faq .faq-rail__title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--accent-600);
  text-transform: uppercase;
}

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

.page-faq .faq-rail__list::-webkit-scrollbar {
  display: none;
}

.page-faq .faq-rail__item {
  flex: 0 0 auto;
}

.page-faq .faq-rail__link {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 8px 12px;
  border: 1px solid var(--ink-900);
  background: var(--paper-0);
  color: var(--ink-900);
  text-decoration: none;
  font-size: 14px;
  line-height: 1.3;
  white-space: nowrap;
  transition: background var(--t-fast), border-color var(--t-fast), color var(--t-fast);
}

.page-faq .faq-rail__link:hover,
.page-faq .faq-rail__link:focus-visible {
  background: var(--accent-100);
  border-color: var(--accent-600);
}

.page-faq .faq-rail__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--accent-600);
}

.page-faq .faq-rail__link:hover .faq-rail__num,
.page-faq .faq-rail__link:focus-visible .faq-rail__num {
  color: var(--accent-600);
}

/* ---------- 章节 ---------- */
.page-faq .faq-sec {
  padding-bottom: 40px;
  margin-bottom: 56px;
  border-bottom: 1px solid var(--ink-900);
  scroll-margin-top: 84px;
}

.page-faq .faq-sec:target .faq-sec__head {
  border-left-color: var(--accent-600);
}

.page-faq .faq-sec:target .faq-sec__num {
  background: var(--accent-600);
  color: var(--paper-0);
  border-color: var(--accent-600);
}

.page-faq .faq-sec__head {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding-left: 12px;
  border-left: 2px solid var(--paper-200);
  margin-bottom: 22px;
  transition: border-color var(--t-mid);
}

.page-faq .faq-sec__num {
  flex: none;
  display: inline-block;
  padding: 2px 7px;
  border: 1px solid var(--ink-900);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--ink-900);
  background: var(--paper-0);
  transition: background var(--t-mid), color var(--t-mid), border-color var(--t-mid);
}

.page-faq .faq-sec__title {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--ink-900);
}

.page-faq .faq-subhead {
  margin: 32px 0 14px;
  padding-bottom: 8px;
  border-bottom: var(--faq-hair);
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--ink-900);
}

.page-faq .faq-sec p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-900);
  max-width: 42em;
}

.page-faq .faq-sec a {
  color: var(--rule-700);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
  transition: text-decoration-thickness var(--t-fast);
}

.page-faq .faq-sec a:hover,
.page-faq .faq-sec a:focus-visible {
  text-decoration-thickness: 2px;
}

.page-faq .faq-sec__foot {
  margin-top: 22px !important;
  padding-top: 12px;
  border-top: var(--faq-hair);
  font-size: 14px !important;
  color: var(--ink-500) !important;
}

/* ---------- 图片 ---------- */
.page-faq .faq-figure {
  margin: 0 0 26px;
  border: 1px solid var(--ink-900);
  background: var(--paper-0);
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-bottom: 1px solid var(--ink-900);
}

.page-faq .faq-figure .media__caption {
  display: block;
  padding: 10px 14px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-500);
}

/* ---------- 三步方块 ---------- */
.page-faq .step-row {
  list-style: none;
  margin: 0 0 24px;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  counter-reset: step;
}

.page-faq .step-row__item {
  position: relative;
  padding: 18px 16px 20px;
  border: 1px solid var(--ink-900);
  background: var(--paper-0);
  transition: border-color var(--t-fast), background var(--t-fast);
}

.page-faq .step-row__item::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 34px;
  height: 3px;
  background: var(--accent-600);
  transition: width var(--t-fast);
}

.page-faq .step-row__item:hover {
  border-color: var(--accent-600);
  background: var(--accent-100);
}

.page-faq .step-row__item:hover::before {
  width: 100%;
}

.page-faq .step-row__num {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--accent-600);
}

.page-faq .step-row__title {
  margin: 0 0 8px;
  font-family: var(--font-serif);
  font-size: 17px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--ink-900);
}

.page-faq .step-row__text {
  margin: 0 !important;
  font-size: 15px !important;
  line-height: 1.8 !important;
  color: var(--ink-500) !important;
}

.page-faq .step-row__chapter {
  position: absolute;
  right: 12px;
  bottom: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--accent-600);
  opacity: 0;
  transition: opacity var(--t-fast);
}

.page-faq .step-row__item:hover .step-row__chapter,
.page-faq .step-row__item:focus-within .step-row__chapter {
  opacity: 1;
}

/* ---------- 栏目网格 ---------- */
.page-faq .col-grid {
  margin: 0 0 24px;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  border-top: 1px solid var(--ink-900);
  border-left: 1px solid var(--ink-900);
}

.page-faq .col-grid__cell {
  padding: 14px 14px 16px;
  border-right: 1px solid var(--ink-900);
  border-bottom: 1px solid var(--ink-900);
  background: var(--paper-0);
  transition: background var(--t-fast);
}

.page-faq .col-grid__cell:nth-child(even) {
  background: var(--paper-200);
}

.page-faq .col-grid__cell:hover {
  background: var(--accent-100);
}

.page-faq .col-grid dt {
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--accent-600);
}

.page-faq .col-grid dd {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-900);
}

/* ---------- 层级列表 ---------- */
.page-faq .layer-list {
  margin: 0 0 26px;
  padding: 0;
  border-top: var(--faq-hair);
}

.page-faq .layer-list__row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4px;
  padding: 14px 0;
  border-bottom: var(--faq-hair);
}

.page-faq .layer-list dt {
  display: flex;
  align-items: baseline;
  gap: 8px;
  font-family: var(--font-serif);
  font-size: 16px;
  font-weight: 600;
  color: var(--ink-900);
}

.page-faq .layer-list__code {
  display: inline-block;
  padding: 1px 6px;
  border: 1px solid var(--teal-700);
  color: var(--teal-700);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  font-weight: 400;
}

.page-faq .layer-list dd {
  margin: 0;
  padding-left: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-500);
}

/* ---------- 折叠问答 ---------- */
.page-faq .faq-q {
  border-top: var(--faq-hair);
}

.page-faq .faq-q:last-of-type {
  border-bottom: var(--faq-hair);
}

.page-faq .faq-q > summary {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 15px 0;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-serif);
  font-size: 16px;
  font-weight: 600;
  line-height: 1.7;
  color: var(--ink-900);
  transition: color var(--t-fast);
}

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

.page-faq .faq-q > summary::before {
  content: "";
  flex: none;
  margin-top: 7px;
  width: 8px;
  height: 8px;
  background:
    linear-gradient(var(--accent-600), var(--accent-600)) left top / 8px 2px no-repeat,
    linear-gradient(var(--accent-600), var(--accent-600)) left top / 2px 8px no-repeat;
  transition: transform var(--t-mid);
  transform-origin: 4px 4px;
}

.page-faq .faq-q[open] > summary::before {
  transform: rotate(90deg);
}

.page-faq .faq-q > summary:hover,
.page-faq .faq-q > summary:focus-visible {
  color: var(--accent-600);
}

.page-faq .faq-q__body {
  padding: 0 0 18px 20px;
  border-left: 2px solid var(--paper-200);
  margin: 0 0 0 3px;
}

.page-faq .faq-q__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-500);
  max-width: 42em;
}

/* ---------- 纯 CSS 现象筛选 ---------- */
.page-faq .faq-filter {
  margin: 8px 0 26px;
}

.page-faq .faq-filter__input {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.page-faq .faq-filter__bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 18px;
}

.page-faq .faq-filter__chip {
  display: inline-block;
  padding: 7px 12px;
  border: 1px solid var(--ink-900);
  background: var(--paper-0);
  color: var(--ink-900);
  font-size: 13px;
  line-height: 1.4;
  cursor: pointer;
  transition: background var(--t-fast), color var(--t-fast), border-color var(--t-fast);
}

.page-faq .faq-filter__chip:hover {
  background: var(--accent-100);
  border-color: var(--accent-600);
}

.page-faq #faq-sym-all:checked ~ .faq-filter__bar [for="faq-sym-all"],
.page-faq #faq-sym-data:checked ~ .faq-filter__bar [for="faq-sym-data"],
.page-faq #faq-sym-notify:checked ~ .faq-filter__bar [for="faq-sym-notify"],
.page-faq #faq-sym-view:checked ~ .faq-filter__bar [for="faq-sym-view"] {
  background: var(--accent-600);
  border-color: var(--accent-600);
  color: var(--paper-0);
}

.page-faq .faq-filter__input:focus-visible ~ .faq-filter__bar {
  outline: 2px solid var(--rule-700);
  outline-offset: 4px;
}

.page-faq .faq-filter__panel {
  border-bottom: var(--faq-hair);
}

.page-faq #faq-sym-data:checked ~ .faq-filter__panel .faq-q:not(.faq-q--data),
.page-faq #faq-sym-notify:checked ~ .faq-filter__panel .faq-q:not(.faq-q--notify),
.page-faq #faq-sym-view:checked ~ .faq-filter__panel .faq-q:not(.faq-q--view) {
  display: none;
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-faq .faq-hero__frame {
    padding: 40px 32px 28px;
  }

  .page-faq .faq-hero h1 {
    font-size: 32px;
    line-height: 1.3;
  }

  .page-faq .step-row {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-faq .col-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-faq .layer-list__row {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: 16px;
    align-items: start;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero {
    margin: 32px 0 80px;
  }

  .page-faq .faq-hero h1 {
    font-size: 38px;
  }

  .page-faq .faq-layout {
    display: grid;
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
    gap: var(--faq-rail-gap);
    align-items: start;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: 28px;
    margin-bottom: 0;
    padding-right: 18px;
    border-right: var(--faq-hair);
  }

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

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

  .page-faq .faq-rail__item + .faq-rail__item {
    border-top: var(--faq-hair);
  }

  .page-faq .faq-rail__link {
    display: flex;
    align-items: baseline;
    width: 100%;
    padding: 10px 12px 10px 0;
    border: 0;
    border-left: 2px solid transparent;
    background: transparent;
    white-space: normal;
    font-size: 14px;
    transition: border-left-color var(--t-fast), background var(--t-fast), padding-left var(--t-fast);
  }

  .page-faq .faq-rail__link:hover,
  .page-faq .faq-rail__link:focus-visible {
    border-left-color: var(--accent-600);
    background: var(--accent-100);
    padding-left: 10px;
  }

  .page-faq .faq-sec {
    scroll-margin-top: 40px;
    margin-bottom: 72px;
    padding-bottom: 48px;
  }

  .page-faq .faq-sec__title {
    font-size: 26px;
  }

  .page-faq .faq-subhead {
    font-size: 20px;
  }

  .page-faq .col-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-faq .step-row__item {
    padding: 20px 18px 24px;
  }
}

/* ---------- 降级与打印 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-q > summary::before,
  .page-faq .step-row__item::before,
  .page-faq .step-row__chapter {
    transition: none;
  }

  .page-faq .faq-q[open] > summary::before {
    transform: none;
    background:
      linear-gradient(var(--accent-600), var(--accent-600)) left top / 8px 2px no-repeat,
      linear-gradient(var(--accent-600), var(--accent-600)) left bottom / 8px 2px no-repeat;
  }
}
<<<PAGE_CSS_END>>>