.page-faq {
  --faq-gold: #D4AF37;
  --faq-red: #E63946;
  --faq-deep: #0B1E3A;
  --faq-card-bg: #102A4C;
  --faq-cat-bg: #0D2442;
  --faq-line: #3A5F8A;
  --faq-hover: #142E55;
  --faq-shadow: 0 10px 30px rgba(2, 10, 26, .35);
  font-family: var(--font-body, 'Noto Serif SC', serif);
  background: var(--faq-deep);
  padding: 2rem 0 4rem;
  overflow-x: hidden;
}

/* 面包屑 */
.page-faq .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .5rem;
  margin-bottom: 1.75rem;
  font-family: var(--font-heading, 'PingFang SC', sans-serif);
  font-size: .8125rem;
  letter-spacing: .03em;
  color: var(--text-secondary, #B0C4DE);
}
.page-faq .breadcrumb a {
  color: var(--gold, #D4AF37);
  text-decoration: none;
  transition: color .2s ease;
}
.page-faq .breadcrumb a:hover {
  color: var(--gold-bright, #FFD700);
}
.page-faq .breadcrumb__sep {
  opacity: .45;
}

/* 头部 */
.page-faq .faq-hero {
  display: grid;
  gap: 1.5rem;
  margin-bottom: 2rem;
  position: relative;
}
.page-faq .faq-hero__text .section-label {
  position: relative;
  padding-left: .875rem;
}
.page-faq .faq-hero__text .section-label::before {
  content: '';
  position: absolute;
  left: 0;
  top: .15rem;
  bottom: .15rem;
  width: 3px;
  background: linear-gradient(180deg, var(--gold), var(--red));
}
.page-faq .faq-hero__text h1 {
  font-family: var(--font-heading, 'PingFang SC', sans-serif);
  font-size: 1.75rem;
  font-weight: 900;
  line-height: 1.25;
  letter-spacing: -.02em;
  color: var(--text-primary, #F5F7FA);
  margin: .875rem 0 .75rem;
  max-width: 36rem;
}
.page-faq .faq-hero__desc {
  font-size: .9375rem;
  line-height: 1.7;
  color: var(--text-secondary, #B0C4DE);
  max-width: 40rem;
  margin: 0 0 .75rem;
}
.page-faq .faq-hero__meta {
  display: inline-flex;
  flex-wrap: wrap;
  gap: .375rem .875rem;
  font-family: var(--font-data, 'Roboto Mono', monospace);
  font-size: .75rem;
  color: var(--text-secondary, #B0C4DE);
  background: rgba(212, 175, 55, .08);
  border: 1px solid rgba(58, 95, 138, .6);
  padding: .5rem .875rem;
  margin: 0;
  letter-spacing: .02em;
}
.page-faq .faq-hero__media {
  margin: 0;
  border: 1px solid var(--faq-line);
  padding: .375rem;
  background: var(--faq-card-bg);
  box-shadow: var(--faq-shadow);
  max-width: 300px;
  position: relative;
}
.page-faq .faq-hero__media::after {
  content: '';
  position: absolute;
  right: -14px;
  bottom: -14px;
  width: 34px;
  height: 34px;
  border-right: 2px solid var(--gold);
  border-bottom: 2px solid var(--gold);
  opacity: .75;
  pointer-events: none;
}
.page-faq .faq-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* 控制台搜索与筛选 */
.page-faq .faq-controls {
  margin-bottom: 2rem;
  background: linear-gradient(135deg, var(--faq-cat-bg), var(--faq-card-bg));
  border: 1px solid var(--faq-line);
  border-left: 3px solid var(--gold);
  padding: 1rem;
  box-shadow: var(--faq-shadow);
}
.page-faq .faq-search {
  display: flex;
  align-items: center;
  gap: .625rem;
  background: var(--faq-deep);
  border: 1px solid var(--faq-line);
  padding: .5rem .875rem;
  margin-bottom: .875rem;
  transition: border-color .2s ease, box-shadow .2s ease;
}
.page-faq .faq-search:focus-within {
  border-color: var(--gold);
  box-shadow: 0 0 0 2px rgba(212, 175, 55, .16);
}
.page-faq .faq-search svg {
  flex: 0 0 auto;
  fill: var(--gold);
}
.page-faq .faq-search__input {
  flex: 1;
  min-width: 0;
  background: transparent;
  border: 0;
  outline: 0;
  font-family: var(--font-heading, 'PingFang SC', sans-serif);
  font-size: .875rem;
  color: var(--text-primary, #F5F7FA);
}
.page-faq .faq-search__input::placeholder {
  color: var(--text-secondary, #B0C4DE);
  opacity: .7;
}
.page-faq .faq-search__count {
  flex: 0 0 auto;
  font-family: var(--font-data, 'Roboto Mono', monospace);
  font-size: .6875rem;
  color: var(--text-secondary, #B0C4DE);
  background: rgba(58, 95, 138, .28);
  padding: .25rem .5rem;
  letter-spacing: .03em;
  white-space: nowrap;
}
.page-faq .faq-controls__filters {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
}
.page-faq .filter-btn {
  font-family: var(--font-heading, 'PingFang SC', sans-serif);
  font-size: .75rem;
  font-weight: 600;
  letter-spacing: .04em;
  background: transparent;
  border: 1px solid var(--faq-line);
  color: var(--text-secondary, #B0C4DE);
  padding: .4rem .875rem;
  cursor: pointer;
  transition: background .2s ease, border-color .2s ease, color .2s ease;
}
.page-faq .filter-btn:hover {
  border-color: var(--gold);
  color: var(--gold);
}
.page-faq .filter-btn.is-active {
  background: rgba(212, 175, 55, .14);
  border-color: var(--gold);
  color: var(--gold);
  box-shadow: inset 0 -2px 0 var(--gold);
}

/* 控制台主体 */
.page-faq .body-row {
  display: grid;
  gap: 1.75rem;
  align-items: start;
}

/* 左侧问题目录 */
.page-faq .faq-catalog {
  border: 1px solid var(--faq-line);
  background: var(--faq-cat-bg);
  padding: 1.25rem 1.125rem;
}
.page-faq .faq-catalog h2 {
  font-family: var(--font-heading, 'PingFang SC', sans-serif);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--text-primary, #F5F7FA);
  margin: 0 0 .875rem;
  padding-bottom: .625rem;
  border-bottom: 2px solid var(--gold);
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.page-faq .faq-catalog h2::after {
  content: '';
  width: 7px;
  height: 7px;
  background: var(--red);
  transform: rotate(45deg);
}
.page-faq .faq-catalog__nav {
  display: grid;
  gap: .375rem;
}
.page-faq .faq-catalog__nav a {
  font-family: var(--font-heading, 'PingFang SC', sans-serif);
  font-size: .8125rem;
  color: var(--text-secondary, #B0C4DE);
  text-decoration: none;
  padding: .375rem .5rem;
  border-left: 2px solid transparent;
  transition: background .2s ease, border-color .2s ease, color .2s ease, padding-left .2s ease;
}
.page-faq .faq-catalog__nav a:hover {
  color: var(--gold);
  border-left-color: var(--gold);
  background: rgba(212, 175, 55, .05);
  padding-left: .875rem;
}
.page-faq .faq-catalog__contact {
  margin-top: 1.375rem;
  border-top: 1px dashed var(--faq-line);
  padding-top: 1rem;
}
.page-faq .faq-catalog__contact p {
  font-size: .8437rem;
  color: var(--text-secondary, #B0C4DE);
  margin: 0 0 .75rem;
}
.page-faq .faq-catalog__contact .btn {
  font-size: .75rem;
  padding: .5rem 1rem;
  text-decoration: none;
  display: inline-block;
}
.page-faq .faq-catalog__contact > span {
  display: block;
  margin-top: .75rem;
  font-size: .6875rem;
  font-family: var(--font-data, 'Roboto Mono', monospace);
  letter-spacing: .02em;
  color: var(--text-secondary, #B0C4DE);
  opacity: .75;
}

/* 右侧内容区 */
.page-faq .faq-main {
  min-width: 0;
  display: grid;
  gap: 2.5rem;
}

/* 区块标题 */
.page-faq .faq-section__head,
.page-faq .faq-guide__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: .375rem .75rem;
  margin-bottom: 1.25rem;
}
.page-faq .faq-section__head h2,
.page-faq .faq-guide__head h2 {
  font-family: var(--font-heading, 'PingFang SC', sans-serif);
  font-size: 1.3125rem;
  font-weight: 900;
  letter-spacing: -.01em;
  color: var(--text-primary, #F5F7FA);
  margin: 0;
  position: relative;
  padding-left: .875rem;
}
.page-faq .faq-section__head h2::before,
.page-faq .faq-guide__head h2::before {
  content: '';
  position: absolute;
  left: 0;
  top: .25rem;
  bottom: .25rem;
  width: 3px;
  background: linear-gradient(180deg, var(--gold), var(--red));
}
.page-faq .faq-section__hint {
  font-family: var(--font-heading, 'PingFang SC', sans-serif);
  font-size: .6875rem;
  letter-spacing: .08em;
  color: var(--text-secondary, #B0C4DE);
  opacity: .8;
}

/* 重要问题卡片 */
.page-faq .faq-important {
  display: grid;
  gap: 1rem;
  grid-template-columns: minmax(0, 1fr);
}
.page-faq .faq-card {
  background: var(--faq-card-bg);
  border: 1px solid var(--faq-line);
  border-left: 3px solid var(--gold);
  padding: 1.25rem 1.375rem 1.375rem;
  transition: background .2s ease, transform .2s ease, box-shadow .2s ease;
  min-width: 0;
}
.page-faq .faq-card:hover {
  background: var(--faq-hover);
  transform: translateX(3px);
  box-shadow: 0 6px 18px rgba(2, 10, 26, .35);
}
.page-faq .faq-card__num {
  display: block;
  font-family: var(--font-data, 'Roboto Mono', monospace);
  font-size: 2rem;
  line-height: 1;
  color: var(--gold);
  opacity: .3;
  margin-bottom: .625rem;
}
.page-faq .faq-card h3 {
  font-family: var(--font-heading, 'PingFang SC', sans-serif);
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary, #F5F7FA);
  margin: 0 0 .5rem;
}
.page-faq .faq-card p {
  font-size: .875rem;
  line-height: 1.75;
  color: var(--text-secondary, #B0C4DE);
  margin: 0;
}
.page-faq .faq-card__figure {
  margin: 1rem 0 0;
  border: 1px solid var(--faq-line);
  padding: .25rem;
  max-width: 320px;
}
.page-faq .faq-card__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* 分类折叠 */
.page-faq .faq-cat {
  margin-bottom: 1.25rem;
  border: 1px solid var(--faq-line);
  background: var(--faq-cat-bg);
}
.page-faq .faq-cat__title {
  font-family: var(--font-heading, 'PingFang SC', sans-serif);
  font-size: 1rem;
  font-weight: 800;
  letter-spacing: .015em;
  color: var(--text-primary, #F5F7FA);
  padding: 1rem 1.125rem;
  margin: 0;
  display: flex;
  align-items: center;
  gap: .75rem;
}
.page-faq .faq-cat__code {
  font-family: var(--font-data, 'Roboto Mono', monospace);
  font-size: .75rem;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  background: var(--red);
  color: #fff;
  flex-shrink: 0;
}
.page-faq .faq-cat__title::after {
  content: '';
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, var(--faq-line), transparent);
}
.page-faq .faq-accordion {
  border-top: 1px solid var(--faq-line);
}
.page-faq .faq-item {
  background: var(--faq-cat-bg);
  border-bottom: 1px solid var(--faq-line);
  transition: background .2s ease;
}
.page-faq .faq-item:last-child {
  border-bottom: 0;
}
.page-faq .faq-item[open] {
  background: var(--faq-card-bg);
}
.page-faq .faq-item summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  font-family: var(--font-heading, 'PingFang SC', sans-serif);
  font-size: .875rem;
  font-weight: 600;
  color: var(--text-secondary, #B0C4DE);
  padding: 1rem 1.125rem;
  transition: color .2s ease;
  user-select: none;
}
.page-faq .faq-item summary::-webkit-details-marker {
  display: none;
}
.page-faq .faq-item summary:hover {
  color: var(--text-primary, #F5F7FA);
}
.page-faq .faq-item summary::after {
  content: '+';
  font-family: var(--font-data, 'Roboto Mono', monospace);
  font-size: 1.125rem;
  line-height: 1;
  color: var(--gold);
  transition: transform .25s ease;
  flex-shrink: 0;
}
.page-faq .faq-item[open] summary {
  color: var(--text-primary, #F5F7FA);
}
.page-faq .faq-item[open] summary::after {
  transform: rotate(45deg);
}
.page-faq .faq-item p {
  font-size: .8437rem;
  line-height: 1.75;
  color: var(--text-secondary, #B0C4DE);
  margin: 0;
  padding: 0 1.375rem 1.15rem;
  border-left: 2px solid var(--gold);
  margin-left: 1.125rem;
}

/* 使用指南 */
.page-faq .faq-guide {
  border: 1px solid var(--faq-line);
  background: linear-gradient(135deg, var(--faq-deep), var(--faq-card-bg));
  padding: 1.5rem 1.5rem 1.75rem;
  position: relative;
  overflow: hidden;
}
.page-faq .faq-guide::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: linear-gradient(180deg, var(--gold), var(--red));
}
.page-faq .faq-guide__head h2 {
  padding-left: 0;
}
.page-faq .faq-guide__head h2::before {
  display: none;
}
.page-faq .faq-guide__head p {
  font-size: .8437rem;
  line-height: 1.65;
  color: var(--text-secondary, #B0C4DE);
  margin: .375rem 0 0;
  width: 100%;
}
.page-faq .faq-guide__steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: .875rem;
  counter-reset: guide;
}
.page-faq .faq-guide__steps li {
  background: var(--faq-cat-bg);
  border: 1px solid var(--faq-line);
  padding: 1.125rem 1.25rem;
  position: relative;
  min-width: 0;
  transition: background .2s ease;
}
.page-faq .faq-guide__steps li:hover {
  background: var(--faq-hover);
}
.page-faq .faq-guide__stepnum {
  display: block;
  font-family: var(--font-data, 'Roboto Mono', monospace);
  font-size: 1.5rem;
  line-height: 1;
  color: var(--gold);
  opacity: .5;
  margin-bottom: .5rem;
}
.page-faq .faq-guide__steps h3 {
  font-family: var(--font-heading, 'PingFang SC', sans-serif);
  font-size: .9375rem;
  font-weight: 700;
  color: var(--text-primary, #F5F7FA);
  margin: 0 0 .375rem;
}
.page-faq .faq-guide__steps p {
  font-size: .8125rem;
  line-height: 1.65;
  color: var(--text-secondary, #B0C4DE);
  margin: 0;
}
.page-faq .faq-guide__more {
  margin-top: 1.5rem;
  padding-top: 1.25rem;
  border-top: 1px dashed var(--faq-line);
  font-size: .8125rem;
  line-height: 1.75;
  color: var(--text-secondary, #B0C4DE);
}
.page-faq .faq-guide__more p {
  margin: 0;
}
.page-faq .faq-guide__more a {
  color: var(--gold);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color .2s ease;
}
.page-faq .faq-guide__more a:hover {
  color: var(--gold-bright);
}

/* 筛选隐藏状态（渐进增强：site.js 运行时生效） */
.page-faq .faq-item.is-hidden,
.page-faq .faq-card.is-hidden {
  display: none;
}

/* 移动端优先：≥768px 桌面网格 */
@media (min-width: 768px) {
  .page-faq .faq-hero {
    grid-template-columns: minmax(0, 1fr) 300px;
    align-items: end;
    gap: 2rem;
  }
  .page-faq .faq-hero__text h1 {
    font-size: 2.25rem;
  }
  .page-faq .faq-hero__meta {
    max-width: none;
    justify-content: flex-start;
  }
  .page-faq .faq-controls {
    position: sticky;
    top: 1rem;
    z-index: 20;
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: .875rem 1.25rem;
  }
  .page-faq .faq-search {
    flex: 0 0 320px;
    margin-bottom: 0;
  }
  .page-faq .faq-controls__filters {
    flex: 1;
    justify-content: flex-end;
  }
  .page-faq .body-row {
    grid-template-columns: 220px minmax(0, 1fr);
    gap: 2rem;
  }
  .page-faq .faq-catalog {
    position: sticky;
    top: 5rem;
  }
  .page-faq .faq-important {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-faq .faq-card--wide {
    grid-column: 1 / -1;
  }
  .page-faq .faq-guide__steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* 桌面宽屏：≥1200px */
@media (min-width: 1200px) {
  .page-faq .faq-guide__steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-faq .faq-guide__head p {
    max-width: 640px;
  }
  .page-faq .faq-search {
    flex-basis: 360px;
  }
}