.page-faq {
  --faq-rail-w: 236px;
  --faq-gutter: 64px;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  background: var(--indigo);
  color: var(--paper);
  padding: calc(var(--header-h) + 56px) 0 64px;
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(to right, var(--line-dark-soft) 0 1px, transparent 1px 80px),
    repeating-linear-gradient(to bottom, var(--line-dark-soft) 0 1px, transparent 1px 80px);
  pointer-events: none;
}

.page-faq .faq-hero .wrap {
  position: relative;
  z-index: 1;
}

.page-faq .faq-hero .crumbs {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--slate);
}

.page-faq .faq-hero .crumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-faq .faq-hero .crumbs li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--slate);
}

.page-faq .faq-hero .crumbs a {
  color: var(--dim-on-dark);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-faq .faq-hero .crumbs a:hover {
  color: var(--whistle);
  border-bottom-color: var(--whistle);
}

.page-faq .faq-hero__frame {
  position: relative;
  margin-top: 36px;
  max-width: 920px;
  padding: 28px 22px 32px;
  border: 1px solid var(--line-dark);
  border-left: 3px solid var(--ochre);
}

.page-faq .faq-hero__frame .eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--whistle);
}

.page-faq .faq-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(32px, 7vw, 66px);
  line-height: 1.03;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-faq .faq-hero .lede {
  margin: 18px 0 0;
  max-width: 62ch;
  font-size: 16.5px;
  line-height: 1.75;
  color: var(--dim-on-dark);
}

.page-faq .faq-hero__stats {
  list-style: none;
  margin: 44px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-dark);
  border: 1px solid var(--line-dark);
  border-right: 0;
}

.page-faq .faq-hero__stats li {
  background: var(--indigo);
  padding: 16px 18px 18px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}

.page-faq .faq-hero__stats .num {
  font-family: var(--font-mono);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  font-size: clamp(22px, 4.6vw, 30px);
  line-height: 1.1;
  letter-spacing: 0.02em;
  color: var(--whistle);
}

.page-faq .faq-hero__label {
  font-size: 12px;
  line-height: 1.5;
  letter-spacing: 0.04em;
  color: var(--dim-on-dark);
}

/* ---------- 主体布局 ---------- */

.page-faq .faq-main {
  padding: 64px 0 96px;
  background: var(--paper);
}

.page-faq .faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 40px;
}

.page-faq .faq-rail,
.page-faq .faq-body {
  min-width: 0;
}

/* 左侧目录 */

.page-faq .faq-rail__card {
  border-top: 2px solid var(--ochre);
  padding-top: 14px;
}

.page-faq .faq-rail__summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink);
}

.page-faq .faq-rail__summary::-webkit-details-marker {
  display: none;
}

.page-faq .faq-rail__mark {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: none;
  color: var(--slate);
}

.page-faq .faq-rail__list {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  border-top: 1px solid var(--line-light);
}

.page-faq .faq-rail__list li {
  border-bottom: 1px solid var(--line-light);
}

.page-faq .faq-rail__list a {
  position: relative;
  display: block;
  padding: 10px 2px 10px 16px;
  font-size: 14px;
  line-height: 1.5;
  color: var(--dim-on-light);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}

.page-faq .faq-rail__list a::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 6px;
  height: 1px;
  background: var(--slate);
  transform: translateY(-50%);
  transition: width var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-faq .faq-rail__list a:hover {
  color: var(--ochre-deep);
}

.page-faq .faq-rail__list a:hover::before {
  width: 10px;
  background: var(--ochre);
}

.page-faq .faq-rail__list a[aria-current="true"],
.page-faq .faq-rail__list a[aria-current="location"] {
  color: var(--ink);
  font-weight: 500;
}

.page-faq .faq-rail__list a[aria-current="true"]::before,
.page-faq .faq-rail__list a[aria-current="location"]::before {
  width: 12px;
  background: var(--ochre);
}

/* ---------- 章节通用 ---------- */

.page-faq .faq-sec {
  position: relative;
  padding-top: 40px;
  border-top: 1px solid var(--line-light);
}

.page-faq .faq-sec + .faq-sec {
  margin-top: 72px;
}

.page-faq .section-tick {
  display: block;
  width: 36px;
  height: 3px;
  margin-bottom: 16px;
  background: var(--slate);
  transition: background-color var(--dur) var(--ease), width var(--dur) var(--ease);
}

.page-faq .faq-sec__kicker {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ochre);
}

.page-faq .faq-sec h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 3.8vw, 38px);
  line-height: 1.08;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-faq .faq-sec__lead {
  margin: 14px 0 0;
  max-width: 68ch;
  font-size: 16px;
  color: var(--dim-on-light);
}

/* ---------- 01 上手 ---------- */

.page-faq .faq-step-row {
  margin-top: 32px;
  display: grid;
  gap: 36px;
}

.page-faq .faq-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 26px;
}

.page-faq .faq-step {
  padding-left: 22px;
  border-left: 2px solid var(--ochre);
}

.page-faq .faq-step__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--ochre);
}

.page-faq .faq-step h3 {
  margin: 6px 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  line-height: 1.32;
  color: var(--ink);
}

.page-faq .faq-step p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--dim-on-light);
}

/* 配图 */

.page-faq .faq-figure {
  margin: 0;
}

.page-faq .faq-figure__frame {
  overflow: hidden;
  border: 1px solid var(--line-light);
  background: var(--night);
}

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

.page-faq .faq-figure .figure-caption {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.65;
  color: var(--slate);
}

.page-faq .faq-figure--wide {
  margin-top: 32px;
}

/* ---------- 02 索引 ---------- */

.page-faq .faq-index-list {
  margin-top: 32px;
  border-top: 1px solid var(--line-light);
}

.page-faq .faq-index-item {
  border-bottom: 1px solid var(--line-light);
}

.page-faq .faq-index-item summary {
  list-style: none;
  cursor: pointer;
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr) auto 18px;
  gap: 12px;
  align-items: baseline;
  padding: 16px 2px;
}

.page-faq .faq-index-item summary::-webkit-details-marker {
  display: none;
}

.page-faq .faq-index-item__num {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--ochre);
}

.page-faq .faq-index-item__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  line-height: 1.35;
  color: var(--ink);
  min-width: 0;
}

.page-faq .faq-index-item__meta {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--slate);
  white-space: nowrap;
}

.page-faq .faq-index-item summary::after {
  content: "+";
  justify-self: end;
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--slate);
  transition: color var(--dur) var(--ease);
}

.page-faq .faq-index-item[open] summary::after {
  content: "−";
  color: var(--ochre);
}

.page-faq .faq-index-item[open] .faq-index-item__title {
  color: var(--ochre-deep);
}

.page-faq .faq-index-item__body {
  padding: 0 2px 20px 46px;
}

.page-faq .faq-index-item__body p {
  margin: 0;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--dim-on-light);
}

/* ---------- 03 检索维度 ---------- */

.page-faq .faq-dims {
  margin-top: 32px;
  display: grid;
  gap: 1px;
  background: var(--line-light);
  border: 1px solid var(--line-light);
}

.page-faq .faq-dim {
  background: var(--paper);
  padding: 20px 18px 22px;
}

.page-faq .faq-dim__key {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  letter-spacing: 0.01em;
  color: var(--indigo);
}

.page-faq .faq-dim p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--dim-on-light);
}

.page-faq .faq-examples {
  margin-top: 28px;
}

.page-faq .faq-examples__lead {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--slate);
}

.page-faq .faq-chips {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-faq .faq-chip {
  display: inline-block;
  padding: 7px 13px;
  border: 1px solid var(--line-light);
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.4;
  color: var(--ink);
  background: transparent;
  white-space: nowrap;
}

.page-faq .faq-chip--accent {
  border-color: var(--ochre);
  color: var(--ochre-deep);
}

/* ---------- 04 积分榜路径 ---------- */

.page-faq .faq-path {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  border-top: 1px solid var(--line-light);
}

.page-faq .faq-path li {
  display: grid;
  grid-template-columns: 22px minmax(0, 1fr);
  grid-template-areas:
    "i t"
    ". d";
  gap: 4px 14px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line-light);
}

.page-faq .faq-path__i {
  grid-area: i;
  display: inline-block;
  width: 20px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  line-height: 1.6;
  text-align: center;
  color: var(--indigo);
  background: var(--whistle);
}

.page-faq .faq-path__t {
  grid-area: t;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink);
}

.page-faq .faq-path__d {
  grid-area: d;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--dim-on-light);
}

/* 表格 */

.page-faq .faq-table {
  margin-top: 28px;
  width: 100%;
  font-size: 14px;
}

.page-faq .faq-table__caption {
  caption-side: top;
  padding-bottom: 10px;
  text-align: left;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--slate);
}

.page-faq .faq-table th[scope="row"] {
  font-family: var(--font-mono);
  font-size: 13.5px;
  font-weight: 600;
  color: var(--ochre-deep);
  white-space: nowrap;
}

/* ---------- 05 字段补充说明 ---------- */

.page-faq .faq-notes {
  margin-top: 28px;
  display: grid;
  gap: 16px;
}

.page-faq .faq-notes p {
  margin: 0;
  padding-left: 16px;
  border-left: 1px solid var(--line-light);
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--dim-on-light);
}

.page-faq .faq-notes strong {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
}

/* ---------- 06 更新流程 ---------- */

.page-faq .faq-flow {
  margin-top: 26px;
}

.page-faq .faq-flow ol {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-faq .faq-flow li {
  display: grid;
  grid-template-columns: 116px minmax(0, 1fr);
  gap: 16px;
  align-items: baseline;
  padding: 14px 0;
  border-top: 1px solid var(--line-light);
}

.page-faq .faq-flow li:last-child {
  border-bottom: 1px solid var(--line-light);
}

.page-faq .faq-flow__num {
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--turf);
}

.page-faq .faq-flow li p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--dim-on-light);
}

.page-faq .faq-note {
  margin: 26px 0 0;
  padding: 16px 18px;
  border-left: 3px solid var(--whistle);
  background: var(--night);
  color: var(--paper);
  font-size: 14.5px;
  line-height: 1.8;
}

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

/* ---------- 07 常见疑问 ---------- */

.page-faq .faq-qa-list {
  margin-top: 30px;
  border-top: 1px solid var(--line-light);
}

.page-faq .faq-qa {
  border-bottom: 1px solid var(--line-light);
}

.page-faq .faq-qa summary {
  list-style: none;
  cursor: pointer;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) 18px;
  gap: 14px;
  align-items: baseline;
  padding: 18px 0;
}

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

.page-faq .faq-qa__num {
  display: inline-block;
  padding: 2px 7px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 600;
  line-height: 1.5;
  letter-spacing: 0.04em;
  color: var(--indigo);
  background: var(--whistle);
}

.page-faq .faq-qa__q {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  line-height: 1.4;
  color: var(--ink);
  min-width: 0;
}

.page-faq .faq-qa summary::after {
  content: "+";
  justify-self: end;
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--slate);
  transition: color var(--dur) var(--ease);
}

.page-faq .faq-qa[open] summary::after {
  content: "−";
  color: var(--ochre);
}

.page-faq .faq-qa__body {
  padding-bottom: 20px;
}

.page-faq .faq-qa__body p {
  margin: 0 0 10px;
  max-width: 66ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--dim-on-light);
}

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

.page-faq .faq-qa__body a,
.page-faq .faq-tail a {
  color: var(--ochre-deep);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-faq .faq-tail {
  margin: 40px 0 0;
  padding-top: 22px;
  border-top: 1px solid var(--line-light);
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--dim-on-light);
}

/* ---------- 焦点态 ---------- */

.page-faq a:focus-visible,
.page-faq summary:focus-visible {
  outline: 2px solid var(--whistle);
  outline-offset: 3px;
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-faq .faq-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-faq .faq-path li {
    grid-template-columns: 22px 132px minmax(0, 1fr);
    grid-template-areas: "i t d";
    gap: 0 14px;
    align-items: baseline;
  }

  .page-faq .faq-notes {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px;
  }
}

@media (min-width: 960px) {
  .page-faq .faq-layout {
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
    gap: var(--faq-gutter);
    align-items: start;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: calc(var(--header-h) + 28px);
  }

  .page-faq .faq-main {
    padding: 80px 0 120px;
  }
}

@media (min-width: 1080px) {
  .page-faq .faq-step-row {
    grid-template-columns: minmax(0, 1fr) 360px;
    gap: 48px;
    align-items: start;
  }

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

@media (max-width: 520px) {
  .page-faq .faq-hero__frame {
    padding: 22px 16px 26px;
  }

  .page-faq .faq-flow li {
    grid-template-columns: minmax(0, 1fr);
    gap: 4px;
  }

  .page-faq .faq-index-item summary {
    grid-template-columns: 30px minmax(0, 1fr) 16px;
  }

  .page-faq .faq-index-item__meta {
    grid-column: 2 / 3;
    grid-row: 2;
    white-space: normal;
  }

  .page-faq .faq-index-item summary::after {
    grid-column: 3;
    grid-row: 1;
  }

  .page-faq .faq-index-item__body {
    padding-left: 2px;
  }

  .page-faq .faq-qa summary {
    grid-template-columns: auto minmax(0, 1fr) 16px;
    gap: 10px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq *,
  .page-faq *::before,
  .page-faq *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}