/* ===== 页面专属：问题解答（.page-faq） ===== */
.page-faq {
  --faq-border: var(--border);
  --faq-border-hover: var(--state-active);
  --faq-number-color: var(--accent-100);
  --faq-card-bg: var(--bg-light);
  --faq-card-radius: 8px;
  --faq-gap: 2rem;
  --faq-padding: 1.5rem;
  --faq-img-radius: 4px;
}

/* ---- 框景首屏 ---- */
.page-faq .faq-hero {
  position: relative;
  margin-top: 2rem;
  margin-bottom: 3rem;
  padding: 2rem 1.5rem;
  border: 1px solid var(--faq-border);
  background: var(--faq-card-bg);
  border-radius: var(--faq-card-radius);
  transition: border-color 0.25s ease;
}
.page-faq .faq-hero:hover {
  border-color: var(--faq-border-hover);
}

/* 框景四角刻度 */
.page-faq .frame-corner {
  position: absolute;
  width: 16px;
  height: 16px;
  border-color: var(--primary-300);
  border-style: solid;
  pointer-events: none;
  opacity: 0.6;
}
.page-faq .frame-corner.tl {
  top: -1px;
  left: -1px;
  border-width: 2px 0 0 2px;
}
.page-faq .frame-corner.tr {
  top: -1px;
  right: -1px;
  border-width: 2px 2px 0 0;
}
.page-faq .frame-corner.bl {
  bottom: -1px;
  left: -1px;
  border-width: 0 0 2px 2px;
}
.page-faq .frame-corner.br {
  bottom: -1px;
  right: -1px;
  border-width: 0 2px 2px 0;
}

/* 面包屑 */
.page-faq .breadcrumb {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-bottom: 1rem;
  letter-spacing: 0.02em;
}
.page-faq .breadcrumb a {
  color: var(--text-secondary);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease, color 0.2s ease;
}
.page-faq .breadcrumb a:hover {
  color: var(--state-active);
  border-bottom-color: var(--state-active);
}
.page-faq .breadcrumb span[aria-current="page"] {
  color: var(--text-primary);
  font-weight: 500;
}

/* 首屏标题 */
.page-faq .faq-hero h1 {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: clamp(1.75rem, 5vw, 2.75rem);
  color: var(--text-primary);
  margin: 0 0 0.5rem;
  line-height: 1.2;
}
.page-faq .faq-hero-desc {
  font-size: 1rem;
  max-width: 600px;
  line-height: 1.6;
  margin: 0;
}

/* ---- 问答章节列表 ---- */
.page-faq .faq-sections {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
  padding-bottom: 4rem;
}

/* ---- 问答卡片 ---- */
.page-faq .faq-card {
  border: 1px solid var(--faq-border);
  border-radius: var(--faq-card-radius);
  background: var(--faq-card-bg);
  padding: var(--faq-padding);
  transition: border-color 0.25s ease, box-shadow 0.25s ease;
}
.page-faq .faq-card:hover {
  border-color: var(--faq-border-hover);
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
}

/* 卡片头部：编号 + 标题 */
.page-faq .faq-card-header {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
  flex-wrap: wrap;
}
.page-faq .faq-card-header .section-number {
  font-family: var(--font-mono);
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--faq-number-color);
  line-height: 1;
  flex-shrink: 0;
}
.page-faq .faq-card-header .section-title {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: clamp(1.2rem, 3vw, 1.6rem);
  color: var(--text-primary);
  margin: 0;
  line-height: 1.3;
}

/* ---- 问答列表 ---- */
.page-faq .faq-items {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

/* 单个问答项 */
.page-faq .faq-item {
  border: none;
  border-radius: 4px;
  transition: background 0.2s ease;
}
.page-faq .faq-item[open] {
  padding-bottom: 0.25rem;
}
.page-faq .faq-item + .faq-item {
  border-top: 1px solid var(--border);
  padding-top: 0.75rem;
  margin-top: 0.25rem;
}

/* 问题（summary） */
.page-faq .faq-item summary {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 1rem;
  color: var(--text-primary);
  cursor: pointer;
  padding: 0.5rem 0;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: color 0.2s ease;
}
.page-faq .faq-item summary::-webkit-details-marker {
  display: none;
}
.page-faq .faq-item summary::before {
  content: "Q";
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.8rem;
  color: var(--accent-400);
  background: transparent;
  border: 1px solid var(--accent-400);
  border-radius: 50%;
  width: 22px;
  height: 22px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: background 0.2s ease, color 0.2s ease;
}
.page-faq .faq-item summary:hover {
  color: var(--state-active);
}
.page-faq .faq-item summary:hover::before {
  background: var(--accent-400);
  color: #fff;
}

/* 答案 */
.page-faq .faq-answer {
  padding: 0.5rem 0 0.75rem 2rem;
  font-family: var(--font-body);
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
}
.page-faq .faq-answer p {
  margin: 0 0 0.75rem;
}
.page-faq .faq-answer p:last-child {
  margin-bottom: 0;
}
.page-faq .faq-answer a {
  color: var(--state-active);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease;
}
.page-faq .faq-answer a:hover {
  border-bottom-color: var(--state-active);
}

/* ---- 图片样式 ---- */
.page-faq .faq-img {
  display: block;
  max-width: 100%;
  height: auto;
  border-radius: var(--faq-img-radius);
  margin-top: 0.75rem;
  border: 1px solid var(--border);
  object-fit: cover;
}

/* ===== 响应式：桌面 ≥768px ===== */
@media (min-width: 768px) {
  .page-faq .faq-hero {
    padding: 3rem 2.5rem;
    margin-top: 3rem;
    margin-bottom: 4rem;
  }
  .page-faq .frame-corner {
    width: 24px;
    height: 24px;
  }
  .page-faq .faq-card {
    padding: 2rem 2.5rem;
  }
  .page-faq .faq-card-header .section-number {
    font-size: 2.25rem;
  }
  .page-faq .faq-card-header {
    gap: 1rem;
    margin-bottom: 1.5rem;
  }
  .page-faq .faq-answer {
    padding-left: 2.5rem;
  }
  .page-faq .faq-img {
    max-width: 320px;
  }
  .page-faq .faq-sections {
    gap: 3rem;
    padding-bottom: 5rem;
  }
}

/* ===== 桌面大屏 ≥1024px ===== */
@media (min-width: 1024px) {
  .page-faq .faq-hero {
    padding: 3.5rem 3rem;
  }
  .page-faq .faq-card {
    padding: 2.5rem 3rem;
  }
  .page-faq .faq-img {
    max-width: 360px;
  }
}