.page-faq {
  --faq-border: 3px solid var(--color-ink);
  --faq-border-light: 3px solid var(--color-paper);
  --faq-shadow-card: 6px 6px 0 var(--color-ink);
  --faq-shadow-figure: 8px 8px 0 var(--color-ink);
  --faq-bg-answer: var(--color-paper-dark);
  overflow-x: hidden;
  background: var(--color-paper);
  color: var(--color-text);
  font-family: var(--font-body);
  line-height: 1.6;
}

.page-faq .is-hidden {
  display: none !important;
}

/* ===== 面包屑 ===== */
.page-faq .breadcrumb {
  max-width: var(--site-width);
  margin: 0 auto;
  padding: 1.25rem var(--gutter) 0;
  font-family: var(--font-index);
  font-size: 0.8rem;
  letter-spacing: 0.06em;
}

.page-faq .breadcrumb a {
  color: var(--color-text);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--trans-fast), border-color var(--trans-fast);
}

.page-faq .breadcrumb a:hover {
  color: var(--color-accent-dark);
  border-bottom-color: currentColor;
}

.page-faq .breadcrumb__sep {
  margin: 0 0.6rem;
  color: var(--color-gray-500);
}

/* ===== 页面头部 ===== */
.page-faq .faq-pagehead {
  max-width: var(--site-width);
  margin: 0 auto;
  padding: 3rem var(--gutter) 2.5rem;
  border-bottom: var(--border-w) solid var(--color-ink);
}

.page-faq .faq-pagehead__index {
  margin: 0 0 1rem;
  font-family: var(--font-index);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--color-gray-700);
}

.page-faq .faq-pagehead__title {
  margin: 0;
  font-family: var(--font-headline);
  font-size: clamp(3.5rem, 13vw, 8rem);
  font-weight: 700;
  line-height: 0.92;
  letter-spacing: -0.02em;
  color: var(--color-ink);
}

.page-faq .faq-pagehead__lead {
  max-width: 62ch;
  margin: 1.25rem 0 0;
  font-size: 1.0625rem;
  color: var(--color-gray-700);
}

/* ===== 工具区：筛选 + 目录 ===== */
.page-faq .faq-wrap {
  max-width: var(--site-width);
  margin: 0 auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}

.page-faq .faq-tools {
  padding-top: 2rem;
  padding-bottom: 2.75rem;
}

.page-faq .faq-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 0.625rem;
  margin: 0;
}

.page-faq .faq-filter .filter-btn {
  border: var(--border-w) solid var(--color-ink);
  background: var(--color-paper);
  color: var(--color-text);
  padding: 0.625rem 1.3rem;
  font-family: var(--font-index);
  font-weight: 500;
  font-size: 0.85rem;
  line-height: 1.2;
  cursor: pointer;
  box-shadow: 4px 4px 0 var(--color-ink);
  transition: background var(--trans-fast), transform var(--trans-fast), box-shadow var(--trans-fast);
}

.page-faq .faq-filter .filter-btn:hover {
  transform: translate(-1px, -1px);
  box-shadow: 6px 6px 0 var(--color-ink);
}

.page-faq .faq-filter .filter-btn.is-active {
  background: var(--color-accent);
  border-color: var(--color-ink);
  color: var(--color-ink);
  font-weight: 700;
  box-shadow: 4px 4px 0 var(--color-ink);
}

.page-faq .faq-index {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.875rem;
  margin-top: 1.75rem;
}

.page-faq .faq-index__item {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  padding: 1rem 1.2rem;
  border: var(--border-w) solid var(--color-ink);
  background: var(--color-paper);
  box-shadow: var(--shadow-soft);
  color: var(--color-text);
  text-decoration: none;
  transition: transform var(--trans-fast), box-shadow var(--trans-fast), background var(--trans-fast);
}

.page-faq .faq-index__item:hover {
  background: var(--color-paper-dark);
  transform: translate(-2px, -2px);
  box-shadow: 8px 8px 0 var(--color-accent);
}

.page-faq .faq-index__no {
  font-family: var(--font-headline);
  font-size: 2.5rem;
  line-height: 1;
  min-width: 2.2em;
  color: var(--color-ink);
}

.page-faq .faq-index__name {
  font-weight: 700;
  font-size: 1rem;
  color: var(--color-text);
}

.page-faq .faq-index__count {
  margin-left: auto;
  padding: 0.25rem 0.7rem;
  font-family: var(--font-index);
  font-size: 0.75rem;
  color: var(--color-gray-500);
  background: var(--color-gray-100);
  border: 1px solid var(--color-gray-300);
  white-space: nowrap;
}

/* ===== 章节通用 ===== */
.page-faq .faq-section {
  border-top: var(--border-w) solid var(--color-ink);
  background: var(--color-paper);
}

.page-faq .faq-section__head {
  display: flex;
  align-items: flex-start;
  gap: 1.25rem;
  padding-top: 2.75rem;
  padding-bottom: 2rem;
}

.page-faq .faq-section__no {
  font-family: var(--font-headline);
  font-size: clamp(4.5rem, 12vw, 8rem);
  line-height: 0.8;
  min-width: 1em;
  color: var(--color-ink);
}

.page-faq .faq-section__head-body {
  border-left: var(--border-w) solid var(--color-ink);
  padding-left: 1.25rem;
}

.page-faq .faq-section__title {
  margin: 0;
  font-family: var(--font-headline);
  font-size: clamp(2.25rem, 5vw, 3.75rem);
  line-height: 1;
  color: var(--color-text);
}

.page-faq .faq-section__lead {
  max-width: 58ch;
  margin: 0.75rem 0 0;
  font-size: 0.95rem;
  color: var(--color-gray-700);
}

.page-faq .faq-section__meta {
  display: inline-block;
  margin-top: 0.75rem;
  font-family: var(--font-index);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-gray-500);
}

/* ===== 栅格布局 ===== */
.page-faq .faq-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.75rem;
  padding-bottom: 3rem;
}

.page-faq .faq-list {
  display: grid;
  gap: 1rem;
  align-content: start;
}

/* ===== 手风琴 ===== */
.page-faq .faq-accordion {
  border: var(--border-w) solid var(--color-ink);
  background: var(--color-paper);
  box-shadow: var(--shadow-soft);
  transition: box-shadow var(--trans-fast), border-color var(--trans-fast);
}

.page-faq .faq-accordion[open] {
  box-shadow: 6px 6px 0 var(--color-accent);
}

.page-faq .faq-q {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.875rem 1rem;
  cursor: pointer;
  list-style: none;
}

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

.page-faq .faq-q::-marker {
  content: "";
}

.page-faq .faq-q__num {
  min-width: 2.8rem;
  height: 2.8rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-ink);
  color: var(--color-paper);
  font-family: var(--font-index);
  font-weight: 700;
  font-size: 0.82rem;
}

.page-faq .faq-q__text {
  flex: 1;
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-text);
  line-height: 1.45;
}

.page-faq .faq-q__icon {
  position: relative;
  min-width: 2.2rem;
  width: 2.2rem;
  height: 2.2rem;
  border: 2px solid var(--color-ink);
  background: var(--color-paper);
  transition: background var(--trans-fast), transform var(--trans-fast);
}

.page-faq .faq-q__icon::before,
.page-faq .faq-q__icon::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  background: var(--color-ink);
  transition: transform var(--trans-fast), background var(--trans-fast);
}

.page-faq .faq-q__icon::before {
  width: 12px;
  height: 2px;
  transform: translate(-50%, -50%);
}

.page-faq .faq-q__icon::after {
  width: 2px;
  height: 12px;
  transform: translate(-50%, -50%);
}

.page-faq .faq-accordion[open] .faq-q__icon {
  background: var(--color-accent);
  border-color: var(--color-ink);
}

.page-faq .faq-accordion[open] .faq-q__icon::after {
  transform: translate(-50%, -50%) scaleY(0);
}

.page-faq .faq-a {
  padding: 0 1.25rem 1.25rem 4.55rem;
  background: var(--faq-bg-answer);
  border-top: 1px solid var(--color-gray-300);
}

.page-faq .faq-a p {
  margin: 1rem 0 0;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--color-gray-700);
}

.page-faq .faq-a a {
  color: var(--color-ink);
  font-weight: 500;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.page-faq .faq-a a:hover {
  color: var(--color-accent-dark);
  background: var(--color-accent-soft);
}

/* ===== 视觉配图 ===== */
.page-faq .faq-visual {
  margin: 0;
  border: var(--border-w) solid var(--color-ink);
  background: var(--color-paper-dark);
  box-shadow: var(--faq-shadow-figure);
  transform: rotate(0.25deg);
  align-self: start;
}

.page-faq .faq-visual img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border-bottom: var(--border-w) solid var(--color-ink);
}

.page-faq .faq-visual figcaption {
  padding: 0.875rem 1rem;
  font-family: var(--font-index);
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  color: var(--color-gray-700);
}

/* ===== 深色章节 ===== */
.page-faq .faq-section--dark {
  background: var(--color-ink-soft);
  color: var(--color-paper);
  border-top: var(--border-w) solid rgba(255, 255, 255, 0.35);
}

.page-faq .faq-section--dark .faq-section__no {
  color: var(--color-accent);
}

.page-faq .faq-section--dark .faq-section__head-body {
  border-left-color: var(--color-paper);
}

.page-faq .faq-section--dark .faq-section__title {
  color: var(--color-paper);
}

.page-faq .faq-section--dark .faq-section__lead {
  color: rgba(255, 255, 255, 0.8);
}

.page-faq .faq-section--dark .faq-section__meta {
  color: rgba(255, 255, 255, 0.65);
}

.page-faq .faq-section--dark .faq-accordion {
  border-color: var(--color-paper);
  box-shadow: 6px 6px 0 rgba(255, 255, 255, 0.25);
}

.page-faq .faq-section--dark .faq-accordion[open] {
  box-shadow: 6px 6px 0 var(--color-accent);
}

.page-faq .faq-section--dark .faq-q__num {
  background: var(--color-accent);
  color: var(--color-ink);
}

.page-faq .faq-section--dark .faq-q__icon {
  border-color: var(--color-ink);
  background: var(--color-paper);
}

.page-faq .faq-section--dark .faq-accordion[open] .faq-q__icon {
  background: var(--color-accent);
  border-color: var(--color-ink);
}

.page-faq .faq-section--dark .faq-a {
  background: var(--faq-bg-answer);
  border-top-color: var(--color-gray-300);
}

.page-faq .faq-section--dark .faq-visual {
  border-color: rgba(255, 255, 255, 0.75);
  background: rgba(255, 255, 255, 0.06);
  box-shadow: 8px 8px 0 rgba(255, 255, 255, 0.28);
}

.page-faq .faq-section--dark .faq-visual img {
  border-bottom-color: rgba(255, 255, 255, 0.35);
}

.page-faq .faq-section--dark .faq-visual figcaption {
  color: var(--color-paper);
}

/* ===== 底部联系 CTA ===== */
.page-faq .faq-cta {
  background: var(--color-ink);
  color: var(--color-paper);
  border-top: var(--border-w) solid var(--color-accent);
}

.page-faq .faq-cta__inner {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  padding-top: 3rem;
  padding-bottom: 3.5rem;
}

.page-faq .faq-cta__label {
  display: inline-block;
  font-family: var(--font-index);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-accent);
}

.page-faq .faq-cta__title {
  margin: 0.5rem 0 0;
  font-family: var(--font-headline);
  font-size: clamp(2rem, 5vw, 3.5rem);
  line-height: 1;
  color: var(--color-paper);
}

.page-faq .faq-cta__text {
  max-width: 62ch;
  margin: 1rem 0 0;
  font-size: 0.95rem;
  color: rgba(255, 255, 255, 0.78);
}

.page-faq .faq-cta__inner .btn {
  align-self: flex-start;
  flex-shrink: 0;
  white-space: nowrap;
}

/* ===== 桌面端媒体查询 ===== */
@media (min-width: 900px) {
  .page-faq .faq-index {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.125rem;
  }

  .page-faq .faq-grid {
    gap: 2.5rem;
  }

  .page-faq .faq-grid--split {
    grid-template-columns: 7fr 5fr;
    align-items: start;
  }

  .page-faq .faq-grid--single {
    max-width: 880px;
  }

  .page-faq .faq-cta__inner {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }

  .page-faq .faq-cta__text {
    margin-top: 0.75rem;
  }
}