.page-faq {
  --faq-rule: 1px solid var(--line);
  --faq-rule-strong: 1px solid var(--line-strong);
  --faq-surface: rgba(20, 33, 30, 0.72);
  --faq-pad: clamp(1rem, 4vw, 2rem);
}

/* 面包屑 */
.page-faq .breadcrumb {
  padding: 1.25rem 0 0;
}

/* 首屏 */
.page-faq .faq-hero {
  padding: clamp(1.5rem, 5vw, 3.25rem) 0 clamp(1.5rem, 3vw, 2.25rem);
  border-bottom: 2px solid var(--line);
}

.page-faq .faq-hero h1 {
  margin: 0.85rem 0 1rem;
  font-size: clamp(1.75rem, 5.4vw, 3.1rem);
  line-height: 1.22;
  letter-spacing: -0.01em;
  color: var(--paper-2);
  max-width: 24ch;
}

.page-faq .faq-hero .lede {
  max-width: 66ch;
  font-size: clamp(1rem, 1.4vw, 1.0625rem);
  line-height: 1.85;
  color: var(--text);
  margin: 0;
}

.page-faq .faq-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  list-style: none;
  margin: 1.35rem 0 1.5rem;
  padding: 0;
}

.page-faq .faq-hero__fav {
  letter-spacing: 0.02em;
}

/* 布局骨架 */
.page-faq .guide-layout {
  padding: clamp(1.5rem, 4vw, 2.5rem) 0 0;
}

/* 左侧目录 */
.page-faq .guide-nav {
  border: var(--faq-rule);
  border-top: 3px solid var(--accent);
  background: var(--faq-surface);
  padding: 1rem;
  margin-bottom: 2rem;
}

.page-faq .guide-nav__title {
  margin: 0 0 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.2em;
  color: var(--muted);
}

.page-faq .guide-nav__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.15rem;
  counter-reset: none;
}

.page-faq .guide-nav__link {
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
  padding: 0.55rem 0.7rem;
  border-left: 2px solid transparent;
  color: var(--text);
  text-decoration: none;
  font-size: 0.9375rem;
  transition: border-color var(--dur) ease, background-color var(--dur) ease, color var(--dur) ease;
}

.page-faq .guide-nav__link:hover,
.page-faq .guide-nav__link:focus-visible {
  border-left-color: var(--accent);
  background: var(--accent-soft);
  color: var(--paper-2);
}

.page-faq .guide-nav__link:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.page-faq .guide-nav__num {
  font-family: var(--font-cond);
  font-size: 1rem;
  color: var(--accent);
  letter-spacing: 0.04em;
}

/* 章节 */
.page-faq .guide-section {
  padding: clamp(1.75rem, 4vw, 3rem) 0;
  border-top: var(--faq-rule);
  scroll-margin-top: 6rem;
}

.page-faq .guide-body > .guide-section:first-child {
  border-top: 0;
  padding-top: clamp(0.75rem, 2vw, 1.25rem);
}

.page-faq .guide-section__head {
  display: flex;
  align-items: baseline;
  gap: 0.85rem;
  margin-bottom: 0.85rem;
}

.page-faq .guide-section__num {
  font-family: var(--font-cond);
  font-size: clamp(1.5rem, 3vw, 2rem);
  line-height: 1;
  color: var(--amber);
  letter-spacing: 0.03em;
}

.page-faq .guide-section h2 {
  margin: 0;
  font-size: clamp(1.25rem, 3vw, 1.75rem);
  line-height: 1.3;
  color: var(--paper-2);
  letter-spacing: -0.005em;
}

.page-faq .guide-section__intro {
  margin: 0;
  max-width: 68ch;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--text);
}

/* 步骤 */
.page-faq .qa-steps {
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
  border-top: var(--faq-rule);
}

.page-faq .qa-steps--flush {
  margin-top: 0;
}

.page-faq .qa-step {
  display: grid;
  grid-template-columns: 2.75rem minmax(0, 1fr);
  gap: 0 0.85rem;
  padding: 0.95rem 0;
  border-bottom: var(--faq-rule);
}

.page-faq .qa-step__num {
  font-family: var(--font-cond);
  font-size: 1.5rem;
  line-height: 1.1;
  color: var(--accent);
}

.page-faq .qa-step__text strong {
  display: block;
  margin-bottom: 0.3rem;
  font-size: 1rem;
  color: var(--paper-2);
}

.page-faq .qa-step__text p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--text);
}

/* 图文 */
.page-faq .faq-figure {
  margin: 1.75rem 0 0;
  border: var(--faq-rule);
  background: var(--board);
}

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

.page-faq .faq-figure .media-frame__caption {
  padding: 0.7rem 0.9rem;
  border-top: var(--faq-rule);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.06em;
  line-height: 1.6;
  color: var(--muted);
}

.page-faq .faq-split {
  display: grid;
  gap: 1.5rem;
  margin-top: 1.5rem;
}

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

/* 指标表 */
.page-faq .faq-ledger {
  width: 100%;
  margin-top: 1.5rem;
  border: var(--faq-rule);
  border-collapse: collapse;
  font-size: 0.9375rem;
}

.page-faq .faq-ledger__caption {
  caption-side: top;
  padding: 0 0 0.6rem;
  text-align: left;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.18em;
  color: var(--muted);
}

.page-faq .faq-ledger th,
.page-faq .faq-ledger td {
  padding: 0.75rem 0.85rem;
  text-align: left;
  vertical-align: top;
  border-bottom: var(--faq-rule);
  line-height: 1.7;
}

.page-faq .faq-ledger thead th {
  background: var(--board-2);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  color: var(--muted);
  font-weight: 400;
}

.page-faq .faq-ledger tbody th {
  color: var(--accent);
  font-weight: 600;
  white-space: nowrap;
}

.page-faq .faq-ledger tbody td {
  color: var(--text);
}

.page-faq .faq-ledger tbody tr:last-child th,
.page-faq .faq-ledger tbody tr:last-child td {
  border-bottom: 0;
}

/* 问答条目 */
.page-faq .qa-list {
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.7rem;
}

.page-faq .qa-item {
  border: var(--faq-rule);
  border-left: 2px solid var(--line);
  background: var(--board);
  transition: border-color var(--dur) ease, background-color var(--dur) ease;
}

.page-faq .qa-item:hover {
  border-left-color: var(--line-strong);
}

.page-faq .qa-item:has(.qa-item__toggle[aria-expanded="true"]) {
  border-left-width: 4px;
  border-left-color: var(--accent);
  background: var(--board-2);
}

.page-faq .qa-item__head {
  margin: 0;
  font-size: 1rem;
  font-weight: 600;
}

.page-faq .qa-item__toggle {
  width: 100%;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.05rem;
  background: none;
  border: 0;
  color: var(--paper-2);
  font: inherit;
  font-weight: 600;
  text-align: left;
  line-height: 1.6;
  cursor: pointer;
  transition: color var(--dur) ease;
}

.page-faq .qa-item__toggle:hover {
  color: var(--accent);
}

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

.page-faq .qa-item__icon {
  position: relative;
  flex: none;
  width: 0.85rem;
  height: 0.85rem;
  margin-top: 0.4rem;
}

.page-faq .qa-item__icon::before,
.page-faq .qa-item__icon::after {
  content: "";
  position: absolute;
  background: var(--accent);
}

.page-faq .qa-item__icon::before {
  left: 0;
  top: 50%;
  width: 100%;
  height: 2px;
  transform: translateY(-50%);
}

.page-faq .qa-item__icon::after {
  top: 0;
  left: 50%;
  width: 2px;
  height: 100%;
  transform: translateX(-50%);
  transition: transform var(--dur) ease, opacity var(--dur) ease;
}

.page-faq .qa-item__toggle[aria-expanded="true"] .qa-item__icon::after {
  transform: translateX(-50%) scaleY(0);
  opacity: 0;
}

.page-faq .qa-item__answer {
  padding: 0 1.05rem 1.05rem;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--text);
  border-top: 1px dashed var(--line);
  margin: 0 1.05rem;
  padding: 0.85rem 0 1.05rem;
}

.page-faq .qa-item__answer p {
  margin: 0 0 0.7rem;
}

.page-faq .qa-item__answer p:last-of-type {
  margin-bottom: 0.4rem;
}

.page-faq .qa-item__link {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px dashed var(--line-strong);
  padding-bottom: 0.1rem;
  transition: color var(--dur) ease, border-color var(--dur) ease;
}

.page-faq .qa-item__link:hover,
.page-faq .qa-item__link:focus-visible {
  color: var(--amber);
  border-bottom-color: var(--amber);
}

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

/* 旁注 */
.page-faq .faq-note {
  margin-top: 1.75rem;
  border-left: 2px solid var(--amber);
  padding: 0.85rem 1rem;
  background: rgba(255, 138, 61, 0.06);
}

.page-faq .faq-note p {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  line-height: 1.75;
  color: var(--text);
}

/* 窄屏保护 */
@media (max-width: 560px) {
  .page-faq .faq-ledger,
  .page-faq .faq-ledger thead,
  .page-faq .faq-ledger tbody,
  .page-faq .faq-ledger tr,
  .page-faq .faq-ledger th,
  .page-faq .faq-ledger td {
    display: block;
    width: 100%;
  }

  .page-faq .faq-ledger thead {
    display: none;
  }

  .page-faq .faq-ledger tbody tr {
    border-bottom: var(--faq-rule);
    padding: 0.6rem 0;
  }

  .page-faq .faq-ledger tbody th,
  .page-faq .faq-ledger tbody td {
    border-bottom: 0;
    padding: 0.2rem 0.85rem;
  }

  .page-faq .faq-ledger tbody th {
    white-space: normal;
  }

  .page-faq .faq-ledger tbody td::before {
    content: "· ";
    color: var(--muted);
  }

  .page-faq .qa-item__answer {
    margin: 0 0.9rem;
    padding: 0.85rem 0 1rem;
  }
}

/* 桌面 */
@media (min-width: 900px) {
  .page-faq .guide-layout {
    display: grid;
    grid-template-columns: 240px minmax(0, 1fr);
    gap: clamp(1.75rem, 4vw, 3.5rem);
    align-items: start;
  }

  .page-faq .guide-nav {
    position: sticky;
    top: 6.5rem;
    margin-bottom: 0;
    max-height: calc(100vh - 8rem);
    overflow: auto;
  }

  .page-faq .faq-split {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    align-items: start;
    gap: clamp(1.25rem, 3vw, 2.5rem);
  }

  .page-faq .qa-step {
    grid-template-columns: 3.25rem minmax(0, 1fr);
  }

  .page-faq .guide-section {
    scroll-margin-top: 7.5rem;
  }
}

@media (min-width: 1200px) {
  .page-faq .faq-hero {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 26rem);
    column-gap: clamp(2rem, 5vw, 4rem);
    align-items: start;
  }

  .page-faq .faq-hero h1,
  .page-faq .faq-hero .micro-tag {
    grid-column: 1;
  }

  .page-faq .faq-hero .lede {
    grid-column: 1;
  }

  .page-faq .faq-hero__meta,
  .page-faq .faq-hero__fav {
    grid-column: 2;
  }

  .page-faq .faq-hero__meta {
    margin-top: 2.6rem;
  }
}