/* ===== page-faq 专属样式 ===== */
.page-faq {
  --faq-sidebar-width: 220px;
  --faq-gap: 2rem;
  --faq-hero-gap: 1.25rem;
  --faq-radius: var(--radius-md);
  --faq-border-light: 1px solid var(--color-border);
  --faq-transition: var(--transition-base);

  display: flex;
  flex-direction: column;
  gap: var(--faq-gap);
  max-width: 1200px;
  margin: 0 auto;
  padding: 1.25rem 1rem 2.5rem;
  color: var(--color-text-dark);
  background: var(--color-white);
  font-family: var(--font-body);
}

/* --- 面包屑 --- */
.page-faq .breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--color-primary);
  margin-bottom: 0.25rem;
}
.page-faq .breadcrumb a {
  color: var(--color-primary);
  text-decoration: none;
  font-weight: 500;
  transition: color var(--faq-transition);
}
.page-faq .breadcrumb a:hover,
.page-faq .breadcrumb a:focus-visible {
  color: var(--color-accent);
}
.page-faq .breadcrumb .brand-divider {
  color: var(--color-border);
  font-weight: 300;
}

/* --- Hero 区域 --- */
.page-faq .faq-hero {
  display: flex;
  flex-direction: column;
  gap: var(--faq-hero-gap);
  padding: 1.5rem 0 0.5rem;
  border-bottom: 2px solid var(--color-bg-light);
}
.page-faq .faq-hero-heading {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}
.page-faq .faq-hero-icon {
  width: 64px;
  height: 64px;
  border-radius: var(--radius-lg);
  background: var(--color-bg-light);
  object-fit: contain;
  padding: 0.35rem;
  box-shadow: var(--shadow-card);
  flex-shrink: 0;
}
.page-faq .faq-hero-heading .section-title {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: clamp(1.6rem, 5vw, 2.4rem);
  letter-spacing: -0.02em;
  text-transform: uppercase;
  color: var(--color-primary);
  border-left: 4px solid var(--color-accent);
  padding-left: 0.75rem;
  line-height: 1.15;
}
.page-faq .faq-hero-desc {
  font-size: 1rem;
  color: var(--color-secondary-btn);
  margin: -0.5rem 0 0;
  font-weight: 400;
  line-height: 1.5;
}

/* --- 搜索框 (纯展示) --- */
.page-faq .faq-search {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--color-bg-light);
  border: var(--faq-border-light);
  border-radius: var(--radius-md);
  padding: 0.5rem 1rem;
  max-width: 480px;
  transition: box-shadow var(--faq-transition), border-color var(--faq-transition);
}
.page-faq .faq-search:focus-within {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(255, 107, 53, 0.15);
}
.page-faq .faq-search-icon {
  color: var(--color-secondary-btn);
  flex-shrink: 0;
  width: 20px;
  height: 20px;
}
.page-faq .faq-search-input {
  flex: 1;
  border: none;
  background: transparent;
  font-family: var(--font-body);
  font-size: 0.95rem;
  color: var(--color-text-dark);
  outline: none;
  cursor: default;
}
.page-faq .faq-search-input::placeholder {
  color: var(--color-border);
  opacity: 0.8;
}

/* --- 隐藏的 radio 组 --- */
.page-faq .faq-radio-group {
  display: none;
}

/* --- 标签筛选 --- */
.page-faq .faq-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  list-style: none;
  margin: 0;
  padding: 0.5rem 0 0;
}
.page-faq .faq-tags li {
  display: inline-flex;
}
.page-faq .faq-tags .tag {
  display: inline-flex;
  align-items: center;
  padding: 0.45rem 1.1rem;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  border-radius: 999px;
  background: var(--color-bg-light);
  color: var(--color-primary);
  border: 1px solid transparent;
  cursor: pointer;
  transition: background var(--faq-transition), color var(--faq-transition), border-color var(--faq-transition), box-shadow var(--faq-transition);
  user-select: none;
}
.page-faq .faq-tags .tag:hover,
.page-faq .faq-tags .tag:focus-visible {
  border-color: var(--color-accent);
  color: var(--color-accent);
}
.page-faq .faq-tags .tag-accent {
  background: var(--color-accent);
  color: var(--color-white);
  border-color: var(--color-accent);
}
.page-faq .faq-tags .tag-accent:hover {
  background: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
  color: var(--color-white);
}

/* radio 选中驱动标签高亮 */
#faq-cat-all:checked ~ .faq-tags label[for="faq-cat-all"],
#faq-cat-register:checked ~ .faq-tags label[for="faq-cat-register"],
#faq-cat-update:checked ~ .faq-tags label[for="faq-cat-update"],
#faq-cat-help:checked ~ .faq-tags label[for="faq-cat-help"] {
  background: var(--color-accent);
  color: var(--color-white);
  border-color: var(--color-accent);
  box-shadow: 0 4px 12px rgba(255, 107, 53, 0.25);
}

/* --- 主体：侧边栏 + 内容 --- */
.page-faq .faq-main {
  display: flex;
  flex-direction: column;
  gap: var(--faq-gap);
  margin-top: 0.5rem;
}

/* --- 左侧技能树 (桌面) --- */
.page-faq .faq-sidebar {
  display: none;
  flex-direction: column;
  gap: 0;
  padding: 0;
  flex-shrink: 0;
  width: 100%;
}
.page-faq .faq-sidebar .step-node {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.4rem 0;
  cursor: pointer;
  transition: opacity var(--faq-transition);
}
.page-faq .faq-sidebar .step-node:hover {
  opacity: 0.85;
}
.page-faq .faq-sidebar .step-circle {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--color-primary);
  color: var(--color-white);
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  box-shadow: 0 2px 8px rgba(10, 46, 77, 0.18);
}
.page-faq .faq-sidebar .step-content {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  color: var(--color-primary);
  cursor: pointer;
  transition: color var(--faq-transition);
  line-height: 1.3;
}
.page-faq .faq-sidebar .step-content:hover,
.page-faq .faq-sidebar .step-content:focus-visible {
  color: var(--color-accent);
}
.page-faq .faq-sidebar .step-connector {
  display: block;
  width: 2px;
  height: 22px;
  background: var(--color-border);
  margin-left: 18px;
  flex-shrink: 0;
}

/* radio 选中驱动侧边栏高亮 */
#faq-cat-register:checked ~ .faq-main .faq-sidebar .step-node:nth-child(1) .step-circle,
#faq-cat-update:checked ~ .faq-main .faq-sidebar .step-node:nth-child(3) .step-circle,
#faq-cat-help:checked ~ .faq-main .faq-sidebar .step-node:nth-child(5) .step-circle {
  background: var(--color-accent);
  color: var(--color-white);
  box-shadow: 0 2px 12px rgba(255, 107, 53, 0.35);
}
#faq-cat-register:checked ~ .faq-main .faq-sidebar .step-node:nth-child(1) .step-content,
#faq-cat-update:checked ~ .faq-main .faq-sidebar .step-node:nth-child(3) .step-content,
#faq-cat-help:checked ~ .faq-main .faq-sidebar .step-node:nth-child(5) .step-content {
  color: var(--color-accent);
}

/* --- 右侧内容区 --- */
.page-faq .faq-content {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

/* --- 分类区块 --- */
.page-faq .faq-category {
  display: block;
}
.page-faq .faq-category-title {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: clamp(1.15rem, 3vw, 1.45rem);
  text-transform: uppercase;
  letter-spacing: -0.01em;
  color: var(--color-primary);
  margin: 0 0 1rem;
  padding-bottom: 0.4rem;
  border-bottom: 3px solid var(--color-accent);
  display: inline-block;
}

/* radio 筛选：控制分类显示/隐藏 */
.page-faq:has(#faq-cat-all:checked) .faq-content .faq-category {
  display: block;
}
.page-faq:has(#faq-cat-register:checked) .faq-content .faq-category[data-category="register"] {
  display: block;
}
.page-faq:has(#faq-cat-register:checked) .faq-content .faq-category:not([data-category="register"]) {
  display: none;
}
.page-faq:has(#faq-cat-update:checked) .faq-content .faq-category[data-category="update"] {
  display: block;
}
.page-faq:has(#faq-cat-update:checked) .faq-content .faq-category:not([data-category="update"]) {
  display: none;
}
.page-faq:has(#faq-cat-help:checked) .faq-content .faq-category[data-category="help"] {
  display: block;
}
.page-faq:has(#faq-cat-help:checked) .faq-content .faq-category:not([data-category="help"]) {
  display: none;
}

/* --- 手风琴项 --- */
.page-faq .faq-item {
  border: var(--faq-border-light);
  border-radius: var(--radius-sm);
  margin-bottom: 0.6rem;
  background: var(--color-bg-light);
  overflow: hidden;
  transition: box-shadow var(--faq-transition), border-color var(--faq-transition);
}
.page-faq .faq-item:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-card);
}
.page-faq .faq-item[open] {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-card);
}
.page-faq .faq-question {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.9rem 1.1rem;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--color-primary);
  cursor: pointer;
  list-style: none;
  transition: color var(--faq-transition), background var(--faq-transition);
  position: relative;
}
.page-faq .faq-question::-webkit-details-marker {
  display: none;
}
.page-faq .faq-question::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  border-right: 2.5px solid var(--color-accent);
  border-bottom: 2.5px solid var(--color-accent);
  transform: rotate(-45deg);
  flex-shrink: 0;
  transition: transform 0.3s ease;
  margin-right: 0.3rem;
}
.page-faq .faq-item[open] .faq-question::before {
  transform: rotate(45deg);
}
.page-faq .faq-item[open] .faq-question {
  color: var(--color-accent);
  background: rgba(255, 107, 53, 0.04);
}
.page-faq .faq-question:hover,
.page-faq .faq-question:focus-visible {
  color: var(--color-accent);
}
.page-faq .faq-answer {
  padding: 0.3rem 1.1rem 1rem 2rem;
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--color-text-dark);
  border-top: 1px dashed var(--color-border);
}
.page-faq .faq-answer a {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 2px;
  font-weight: 500;
  transition: color var(--faq-transition);
}
.page-faq .faq-answer a:hover {
  color: var(--color-accent-hover);
}

/* --- 步骤图 --- */
.page-faq .faq-step-img {
  width: 100%;
  max-width: 400px;
  height: auto;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-card);
  margin-top: 0.25rem;
  display: block;
  object-fit: cover;
  background: var(--color-bg-light);
}

/* --- 桌面端 (≥768px) --- */
@media (min-width: 768px) {
  .page-faq {
    padding: 1.5rem 2rem 3rem;
    gap: 1.75rem;
  }
  .page-faq .faq-hero {
    flex-direction: row;
    flex-wrap: wrap;
    align-items: flex-end;
    justify-content: space-between;
    padding: 2rem 0 0.75rem;
  }
  .page-faq .faq-hero-heading {
    flex: 1;
  }
  .page-faq .faq-hero-icon {
    width: 80px;
    height: 80px;
  }
  .page-faq .faq-hero-desc {
    flex-basis: 100%;
    font-size: 1.05rem;
  }
  .page-faq .faq-search {
    flex-basis: 100%;
    max-width: 400px;
    margin-left: auto;
  }
  .page-faq .faq-tags {
    padding: 0.25rem 0 0.5rem;
    gap: 0.75rem;
  }
  .page-faq .faq-tags .tag {
    font-size: 0.8rem;
    padding: 0.4rem 1.2rem;
  }

  /* 主体双列 */
  .page-faq .faq-main {
    flex-direction: row;
    gap: 2.5rem;
    align-items: flex-start;
  }

  /* 侧边栏固定宽度 */
  .page-faq .faq-sidebar {
    display: flex;
    width: var(--faq-sidebar-width);
    position: sticky;
    top: 2rem;
    align-self: flex-start;
    padding-top: 0.4rem;
  }
  .page-faq .faq-sidebar .step-circle {
    width: 42px;
    height: 42px;
    font-size: 1rem;
  }
  .page-faq .faq-sidebar .step-content {
    font-size: 0.9rem;
  }
  .page-faq .faq-sidebar .step-connector {
    height: 26px;
  }

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

  .page-faq .faq-category-title {
    font-size: 1.3rem;
    margin-bottom: 1.1rem;
  }

  .page-faq .faq-question {
    font-size: 1rem;
    padding: 0.95rem 1.2rem;
  }
  .page-faq .faq-answer {
    padding-left: 2.4rem;
    font-size: 0.98rem;
  }
}

/* --- 大桌面 (≥1024px) --- */
@media (min-width: 1024px) {
  .page-faq {
    padding: 2rem 2.5rem 3.5rem;
  }
  .page-faq .faq-hero {
    flex-wrap: nowrap;
    align-items: center;
  }
  .page-faq .faq-hero-desc {
    flex-basis: auto;
    margin-right: auto;
  }
  .page-faq .faq-search {
    flex-basis: 320px;
    margin-left: 0;
  }
  .page-faq .faq-sidebar {
    width: 240px;
  }
}

/* --- 确保所有图片响应式 --- */
.page-faq img {
  max-width: 100%;
  height: auto;
}

/* --- 聚焦样式 --- */
.page-faq .faq-tags .tag:focus-visible,
.page-faq .faq-sidebar .step-content:focus-visible,
.page-faq .faq-question:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* --- 打印优化 --- */
@media print {
  .page-faq {
    padding: 1rem;
    color: #000;
    background: #fff;
  }
  .page-faq .faq-sidebar,
  .page-faq .faq-tags,
  .page-faq .faq-search {
    display: none !important;
  }
  .page-faq .faq-category {
    display: block !important;
    page-break-inside: avoid;
  }
  .page-faq .faq-item {
    border: 1px solid #ccc;
    box-shadow: none;
  }
  .page-faq .faq-item[open] .faq-answer {
    display: block !important;
  }
}