.page-faq {
  --faq-card-border: 1px solid var(--color-brand-accent);
  --faq-card-bg: var(--color-surface-dark);
  --faq-card-radius: 4px;
  --faq-card-shadow: 0 2px 6px rgba(0,0,0,0.35);

  padding-top: calc(var(--header-total, 5.75rem) + 1rem);
}

.page-faq .container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

/* 面包屑 */
.page-faq .breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: var(--font-body);
  font-size: var(--size-small);
  color: var(--color-neutral-gray);
  margin-bottom: var(--space-lg);
}

.page-faq .breadcrumb a {
  color: var(--color-brand-accent);
  text-decoration: none;
}

.page-faq .breadcrumb a:hover,
.page-faq .breadcrumb a:focus-visible {
  text-decoration: underline;
}

.page-faq .breadcrumb span[aria-current="page"] {
  color: var(--color-primary-fg);
  font-weight: 600;
}

/* Hero 区 */
.page-faq .faq-hero {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  margin-bottom: var(--space-2xl);
  background: var(--color-surface-dark);
  border: var(--faq-card-border);
  padding: var(--space-lg);
  border-radius: var(--faq-card-radius);
  box-shadow: var(--faq-card-shadow);
}

.page-faq .faq-hero-icon {
  flex-shrink: 0;
  width: 140px;
  height: 140px;
  object-fit: contain;
  border-radius: 2px;
}

.page-faq .faq-hero-text {
  flex: 1;
  min-width: 0;
}

.page-faq .faq-title {
  font-family: var(--font-heading);
  font-size: var(--size-h2);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--color-primary-fg);
  margin: 0 0 var(--space-sm);
  line-height: 1.1;
}

.page-faq .faq-subtitle {
  font-family: var(--font-body);
  font-size: var(--size-body);
  color: var(--color-neutral-gray);
  margin: 0 0 var(--space-md);
  line-height: 1.5;
}

.page-faq .faq-search-wrapper {
  position: relative;
  max-width: 420px;
}

.page-faq .faq-search-input {
  width: 100%;
  padding: 0.6rem 2.2rem 0.6rem 0.8rem;
  background: var(--color-surface-light);
  border: 1px solid var(--color-border-subtle);
  border-radius: 2px;
  color: var(--color-primary-fg);
  font-family: var(--font-mono);
  font-size: var(--size-body);
  transition: border-color var(--transition-fast);
  box-sizing: border-box;
}

.page-faq .faq-search-input::placeholder {
  color: var(--color-neutral-gray);
  opacity: 0.7;
}

.page-faq .faq-search-input:focus {
  outline: var(--outline, 2px solid var(--color-accent-secondary));
  outline-offset: 2px;
  border-color: var(--color-accent-secondary);
}

.page-faq .faq-search-icon {
  position: absolute;
  right: 0.7rem;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1rem;
  pointer-events: none;
  color: var(--color-accent-secondary);
}

/* 章节 */
.page-faq .faq-section {
  margin-bottom: var(--space-xl);
}

.page-faq .faq-section-heading {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  font-family: var(--font-heading);
  font-size: var(--size-h3);
  font-weight: 700;
  color: var(--color-accent-secondary);
  margin: 0 0 var(--space-lg);
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid var(--color-border-subtle);
  letter-spacing: 0.02em;
}

.page-faq .faq-section-icon {
  width: 48px;
  height: 48px;
  object-fit: contain;
  flex-shrink: 0;
  border-radius: 2px;
}

/* 卡片容器 — 两列不对称 */
.page-faq .faq-cards {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.page-faq .faq-card {
  flex: 1 1 calc(50% - var(--space-md));
  min-width: 240px;
  background: var(--faq-card-bg);
  border: var(--faq-card-border);
  border-radius: var(--faq-card-radius);
  box-shadow: var(--faq-card-shadow);
  transition: box-shadow var(--transition-fast), transform var(--transition-fast);
  overflow: hidden;
}

/* 不对称：大卡片占约 60%，小卡片占约 40% */
.page-faq .faq-card:nth-child(odd) {
  flex: 1.5 1 calc(60% - var(--space-md));
}

.page-faq .faq-card:nth-child(even) {
  flex: 1 1 calc(40% - var(--space-md));
  min-width: 200px;
}

.page-faq .faq-card:hover {
  box-shadow: 0 4px 12px rgba(211,47,47,0.25);
  transform: translateY(-2px);
}

.page-faq .faq-card-question {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: var(--font-heading);
  font-size: var(--size-h4);
  font-weight: 600;
  color: var(--color-accent-secondary);
  margin: 0;
  padding: var(--space-md);
  cursor: pointer;
  user-select: none;
  transition: background var(--transition-fast);
}

.page-faq .faq-card-question:hover,
.page-faq .faq-card-question:focus-visible {
  background: var(--color-surface-light);
}

.page-faq .faq-card-question:focus-visible {
  outline: var(--outline, 2px solid var(--color-brand-accent));
  outline-offset: -2px;
}

.page-faq .faq-q-marker {
  font-family: var(--font-mono);
  font-size: var(--size-small);
  color: var(--color-brand-accent);
  background: var(--color-surface-light);
  padding: 0.1rem 0.4rem;
  border-radius: 2px;
  flex-shrink: 0;
}

.page-faq .faq-card-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.25s ease, padding 0.25s ease;
  padding: 0 var(--space-md);
  font-family: var(--font-body);
  font-size: var(--size-body);
  color: var(--color-primary-fg);
  line-height: 1.6;
}

.page-faq .faq-card-answer p {
  margin: 0 0 var(--space-sm);
}

.page-faq .faq-card-answer a {
  color: var(--color-brand-accent);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.page-faq .faq-card-answer a:hover {
  color: var(--color-accent-secondary);
}

/* 展开状态 */
.page-faq .faq-card[data-expanded="true"] .faq-card-answer {
  max-height: 400px;
  padding: 0 var(--space-md) var(--space-md);
}

.page-faq .faq-card[data-expanded="true"] .faq-card-question {
  color: var(--color-primary-fg);
  background: var(--color-surface-light);
}

/* 搜索隐藏 */
.page-faq .faq-card[data-hidden="true"] {
  display: none;
}

/* 更多帮助 */
.page-faq .faq-more-help {
  margin: var(--space-2xl) 0 var(--space-xl);
  padding: var(--space-lg);
  color: var(--color-neutral-gray);
  font-family: var(--font-body);
  font-size: var(--size-body);
  text-align: center;
  border-top: 1px solid var(--color-border-subtle);
}

.page-faq .faq-more-help a {
  color: var(--color-brand-accent);
  text-decoration: underline;
  text-underline-offset: 2px;
}

/* 可访问隐藏 */
.page-faq .visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0,0,0,0);
  border: 0;
}

/* 窄屏响应 */
@media (max-width: 768px) {
  .page-faq {
    padding-top: calc(var(--header-total, 5.75rem) + 0.5rem);
  }

  .page-faq .faq-hero {
    flex-direction: column;
    align-items: flex-start;
    padding: var(--space-md);
  }

  .page-faq .faq-hero-icon {
    width: 100px;
    height: 100px;
  }

  .page-faq .faq-title {
    font-size: var(--size-h3);
  }

  .page-faq .faq-search-input {
    font-size: var(--size-small);
  }

  .page-faq .faq-section-heading {
    font-size: var(--size-h4);
  }

  .page-faq .faq-section-icon {
    width: 36px;
    height: 36px;
  }

  .page-faq .faq-card {
    flex: 1 1 100% !important;
    min-width: 0 !important;
  }

  .page-faq .faq-card:nth-child(odd),
  .page-faq .faq-card:nth-child(even) {
    flex: 1 1 100% !important;
  }

  .page-faq .faq-card-question {
    font-size: var(--size-body);
    padding: var(--space-sm) var(--space-md);
  }
}

/* 桌面微调 */
@media (min-width: 1200px) {
  .page-faq .faq-hero-icon {
    width: 160px;
    height: 160px;
  }

  .page-faq .faq-section-icon {
    width: 56px;
    height: 56px;
  }
}