/* ===== 页面作用域：.page-faq ===== */
.page-faq {
  --faq-toc-width: 220px;
  --faq-accent: #00B4D8;
  --faq-brand: #E63946;
  --faq-bg-card: #1F1F3A;
  --faq-border-color: #2E2E4A;
  --faq-text: #E0E0E0;
  --faq-heading-color: #FFFFFF;
  --faq-muted: #9CA3AF;
  --faq-radius: 2px;
  --faq-transition: 0.25s ease-out;
  --faq-font-heading: 'Inter', 'Poppins', system-ui, sans-serif;
  --faq-font-body: 'Inter', system-ui, sans-serif;

  display: flex;
  flex-direction: column;
  background: #1A1A2E;
  color: var(--faq-text);
  font-family: var(--faq-font-body);
  line-height: 1.6;
  min-height: 80vh;
  position: relative;
}

/* ===== 左屏目录 ===== */
.faq-toc {
  display: none;
  width: 100%;
  background: #16162A;
  border-bottom: 1px solid var(--faq-border-color);
  padding: var(--spacing-sm) var(--spacing-md);
  order: 0;
}

.faq-toc-sticky {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

.faq-toc-label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--faq-muted);
  font-weight: 600;
  white-space: nowrap;
}

.faq-toc-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: var(--spacing-lg);
  flex-wrap: wrap;
}

.toc-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  color: var(--faq-muted);
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  transition: color var(--faq-transition);
  padding: 0.2rem 0;
  border-bottom: 2px solid transparent;
}

.toc-link:hover,
.toc-link:focus-visible {
  color: var(--faq-accent);
  border-bottom-color: var(--faq-accent);
  outline: none;
}

.toc-num {
  font-family: var(--faq-font-heading);
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--faq-accent);
  letter-spacing: -0.02em;
}

.toc-indicator {
  display: none;
}

/* ===== 右屏内容容器 ===== */
.faq-content {
  flex: 1;
  width: 100%;
  padding: var(--spacing-lg) var(--spacing-md);
  order: 1;
  max-width: 100%;
  overflow-x: hidden;
}

/* ===== 页头 ===== */
.faq-page-header {
  margin-bottom: var(--spacing-xl);
  border-bottom: 1px solid var(--faq-border-color);
  padding-bottom: var(--spacing-lg);
}

.faq-title {
  font-family: var(--faq-font-heading);
  font-size: 2.8rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--faq-heading-color);
  margin: 0 0 var(--spacing-xs);
  line-height: 1.1;
}

.faq-subtitle {
  font-size: 1rem;
  color: var(--faq-muted);
  margin: 0 0 var(--spacing-md);
  font-weight: 400;
}

.faq-search-wrapper {
  max-width: 380px;
}

.faq-search-input {
  width: 100%;
  padding: 0.6rem 1rem;
  background: #16162A;
  border: 1px solid var(--faq-border-color);
  color: var(--faq-text);
  font-family: var(--faq-font-body);
  font-size: 0.9rem;
  border-radius: var(--faq-radius);
  transition: border-color var(--faq-transition), box-shadow var(--faq-transition);
}

.faq-search-input:focus {
  outline: none;
  border-color: var(--faq-accent);
  box-shadow: 0 0 0 2px rgba(0, 180, 216, 0.25);
}

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

/* ===== 区块通用 ===== */
.faq-block {
  margin-bottom: var(--spacing-xl);
  scroll-margin-top: 1.5rem;
}

.block-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
  position: relative;
}

.block-header .section-label {
  font-family: var(--faq-font-heading);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--faq-accent);
  letter-spacing: -0.03em;
  line-height: 1;
  opacity: 0.8;
}

.block-heading {
  font-family: var(--faq-font-heading);
  font-size: 1.6rem;
  font-weight: 600;
  color: var(--faq-heading-color);
  margin: 0;
  letter-spacing: -0.02em;
}

.block-body {
  padding-left: 0;
}

/* ===== 01 登录引导 ===== */
.faq-guide-body {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.guide-text {
  flex: 1;
}

.guide-summary {
  font-size: 1rem;
  margin: 0 0 var(--spacing-md);
  color: var(--faq-text);
}

.guide-steps {
  list-style: none;
  padding: 0;
  margin: 0 0 var(--spacing-md);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.guide-steps li {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-md);
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--faq-bg-card);
  border-left: 3px solid var(--faq-accent);
  border-radius: 0 var(--faq-radius) var(--faq-radius) 0;
}

.step-num {
  font-family: var(--faq-font-heading);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--faq-accent);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  white-space: nowrap;
  min-width: 4.2em;
}

.step-desc {
  font-size: 0.95rem;
  color: var(--faq-text);
}

.faq-details-guide {
  margin-top: var(--spacing-sm);
  border: 1px solid var(--faq-border-color);
  border-radius: var(--faq-radius);
  background: var(--faq-bg-card);
}

.faq-details-guide summary {
  padding: var(--spacing-sm) var(--spacing-md);
  cursor: pointer;
  font-weight: 500;
  color: var(--faq-accent);
  font-size: 0.9rem;
  transition: background var(--faq-transition);
  list-style: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.faq-details-guide summary::-webkit-details-marker {
  display: none;
}

.faq-details-guide summary::before {
  content: '+';
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--faq-accent);
  transition: transform var(--faq-transition);
}

.faq-details-guide[open] summary::before {
  content: '−';
}

.faq-details-guide summary:hover {
  background: rgba(0, 180, 216, 0.08);
}

.details-content {
  padding: 0 var(--spacing-md) var(--spacing-md);
  font-size: 0.9rem;
  color: var(--faq-muted);
  border-top: 1px solid var(--faq-border-color);
}

.details-content p {
  margin: var(--spacing-sm) 0;
}

.guide-visual {
  width: 100%;
  max-width: 500px;
}

.guide-img {
  width: 100%;
  height: auto;
  border-radius: var(--faq-radius);
  border: 1px solid var(--faq-border-color);
  object-fit: cover;
  display: block;
}

/* ===== 02 帮助文档 ===== */
.faq-docs-body {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.docs-summary {
  font-size: 1rem;
  margin: 0;
  color: var(--faq-text);
}

.docs-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-md);
}

.doc-card {
  background: var(--faq-bg-card);
  border: 1px solid var(--faq-border-color);
  border-radius: var(--faq-radius);
  padding: var(--spacing-md);
  position: relative;
  transition: border-color var(--faq-transition), transform var(--faq-transition);
}

.doc-card:hover {
  border-color: var(--faq-accent);
  transform: translateY(-2px);
}

.doc-card-highlight {
  border-color: var(--faq-brand);
  background: linear-gradient(135deg, #1F1F3A 60%, #2A1A2E);
}

.doc-card-highlight:hover {
  border-color: var(--faq-brand);
  box-shadow: 0 0 12px rgba(230, 57, 70, 0.18);
}

.doc-col {
  font-family: var(--faq-font-heading);
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--faq-accent);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  display: inline-block;
  margin-bottom: var(--spacing-xs);
}

.doc-title {
  font-family: var(--faq-font-heading);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--faq-heading-color);
  margin: 0 0 var(--spacing-xs);
  letter-spacing: -0.01em;
}

.doc-desc {
  font-size: 0.85rem;
  color: var(--faq-muted);
  margin: 0;
  line-height: 1.5;
}

.doc-badge {
  display: inline-block;
  background: var(--faq-brand);
  color: #fff;
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 0.15rem 0.6rem;
  border-radius: var(--faq-radius);
  margin-top: var(--spacing-sm);
}

.docs-visual {
  width: 100%;
  max-width: 400px;
}

.docs-img {
  width: 100%;
  height: auto;
  border-radius: var(--faq-radius);
  border: 1px solid var(--faq-border-color);
  object-fit: cover;
  display: block;
}

/* ===== 03 常见问题 ===== */
.faq-qa-body {
  padding-left: 0;
}

.qa-deco {
  width: 50px;
  height: 50px;
  border-radius: var(--faq-radius);
  opacity: 0.7;
  object-fit: cover;
  margin-left: auto;
  flex-shrink: 0;
}

.qa-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.qa-item {
  border: 1px solid var(--faq-border-color);
  border-radius: var(--faq-radius);
  background: var(--faq-bg-card);
  overflow: hidden;
  transition: border-color var(--faq-transition);
}

.qa-item[open] {
  border-color: var(--faq-accent);
}

.qa-question {
  padding: var(--spacing-md);
  cursor: pointer;
  font-weight: 500;
  color: var(--faq-heading-color);
  font-size: 1rem;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  transition: background var(--faq-transition), color var(--faq-transition);
  user-select: none;
}

.qa-question::-webkit-details-marker {
  display: none;
}

.qa-question::before {
  content: '▸';
  font-size: 1rem;
  color: var(--faq-accent);
  transition: transform var(--faq-transition);
  flex-shrink: 0;
}

.qa-item[open] .qa-question::before {
  transform: rotate(90deg);
}

.qa-question:hover {
  background: rgba(0, 180, 216, 0.06);
  color: var(--faq-accent);
}

.qa-answer {
  padding: 0 var(--spacing-md) var(--spacing-md);
  font-size: 0.9rem;
  color: var(--faq-text);
  border-top: 1px solid var(--faq-border-color);
  line-height: 1.7;
}

.qa-answer p {
  margin: var(--spacing-sm) 0;
}

.qa-answer .faq-link {
  color: var(--faq-accent);
  text-decoration: underline;
  text-underline-offset: 2px;
  transition: color var(--faq-transition);
}

.qa-answer .faq-link:hover {
  color: #66E0FF;
}

/* ===== 页内导航 ===== */
.faq-internal-nav {
  margin-top: var(--spacing-xl);
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--faq-border-color);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--spacing-sm) var(--spacing-md);
}

.nav-label {
  font-size: 0.8rem;
  color: var(--faq-muted);
  font-weight: 500;
  letter-spacing: 0.02em;
}

.faq-internal-nav .faq-link {
  font-size: 0.85rem;
  color: var(--faq-accent);
  text-decoration: none;
  padding: 0.2rem 0.6rem;
  border: 1px solid transparent;
  border-radius: var(--faq-radius);
  transition: border-color var(--faq-transition), background var(--faq-transition);
}

.faq-internal-nav .faq-link:hover {
  border-color: var(--faq-accent);
  background: rgba(0, 180, 216, 0.08);
}

/* ===== 通用链接 ===== */
.faq-link {
  color: var(--faq-accent);
  text-decoration: underline;
  text-underline-offset: 2px;
  transition: color var(--faq-transition);
}

.faq-link:hover {
  color: #66E0FF;
}

/* ===== 桌面端：左右分屏 ===== */
@media (min-width: 768px) {
  .page-faq {
    flex-direction: row;
    align-items: flex-start;
  }

  .faq-toc {
    display: block;
    width: var(--faq-toc-width);
    min-width: var(--faq-toc-width);
    border-bottom: none;
    border-right: 1px solid var(--faq-border-color);
    padding: var(--spacing-xl) var(--spacing-md) var(--spacing-xl) var(--spacing-lg);
    background: #16162A;
    position: sticky;
    top: 0;
    align-self: flex-start;
    min-height: 80vh;
    order: 0;
  }

  .faq-toc-sticky {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-lg);
    position: sticky;
    top: var(--spacing-lg);
  }

  .faq-toc-label {
    font-size: 0.65rem;
    color: var(--faq-muted);
    border-bottom: 1px solid var(--faq-border-color);
    padding-bottom: var(--spacing-sm);
    width: 100%;
  }

  .faq-toc-list {
    flex-direction: column;
    gap: var(--spacing-md);
    width: 100%;
  }

  .toc-link {
    font-size: 0.9rem;
    padding: 0.35rem 0;
    border-bottom: none;
    border-left: 2px solid transparent;
    padding-left: var(--spacing-sm);
    width: 100%;
  }

  .toc-link:hover,
  .toc-link:focus-visible {
    border-left-color: var(--faq-accent);
    border-bottom: none;
    color: var(--faq-accent);
  }

  .toc-num {
    font-size: 0.8rem;
  }

  .toc-indicator {
    display: block;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, var(--faq-accent), transparent);
    margin-top: var(--spacing-sm);
    opacity: 0.4;
  }

  .faq-content {
    flex: 1;
    padding: var(--spacing-xl) var(--spacing-xl) var(--spacing-xl) var(--spacing-lg);
    max-width: calc(100% - var(--faq-toc-width));
    order: 1;
  }

  .faq-title {
    font-size: 3.6rem;
  }

  .faq-guide-body {
    flex-direction: row;
    align-items: flex-start;
  }

  .guide-visual {
    max-width: 400px;
    flex-shrink: 0;
  }

  .faq-docs-body {
    flex-direction: row;
    flex-wrap: wrap;
    align-items: flex-start;
  }

  .docs-summary {
    width: 100%;
  }

  .docs-grid {
    flex: 1;
    min-width: 280px;
    grid-template-columns: 1fr 1fr;
  }

  .docs-visual {
    max-width: 300px;
    flex-shrink: 0;
    margin-left: var(--spacing-md);
  }

  .qa-deco {
    width: 70px;
    height: 70px;
  }

  .block-body {
    padding-left: 2.5rem;
  }

  .faq-qa-body {
    padding-left: 2.5rem;
  }
}

/* ===== 大桌面端微调 ===== */
@media (min-width: 1200px) {
  .faq-content {
    padding-right: calc((100vw - var(--max-width) + var(--faq-toc-width)) / 2);
  }

  .docs-grid {
    grid-template-columns: 1fr 1fr;
  }
}

/* ===== 移动端窄屏优化 ===== */
@media (max-width: 420px) {
  .faq-title {
    font-size: 2rem;
  }

  .block-heading {
    font-size: 1.2rem;
  }

  .guide-steps li {
    flex-direction: column;
    gap: 0.25rem;
    padding: var(--spacing-sm);
  }

  .step-num {
    min-width: auto;
  }

  .faq-toc-list {
    gap: var(--spacing-sm);
  }

  .toc-link {
    font-size: 0.75rem;
  }

  .qa-deco {
    display: none;
  }

  .docs-grid {
    grid-template-columns: 1fr;
  }
}

/* ===== 打印样式 ===== */
@media print {
  .page-faq {
    background: #fff;
    color: #222;
  }

  .faq-toc {
    display: none;
  }

  .faq-content {
    max-width: 100%;
    padding: 1rem;
  }

  .faq-title,
  .block-heading {
    color: #111;
  }

  .faq-search-wrapper {
    display: none;
  }

  .qa-deco {
    display: none;
  }

  .faq-details-guide {
    border: 1px solid #ccc;
  }

  .faq-details-guide summary {
    color: #111;
  }

  .qa-item {
    border: 1px solid #ccc;
    break-inside: avoid;
  }

  .qa-question::before {
    content: 'Q: ';
    color: #111;
  }

  .qa-item[open] .qa-question::before {
    transform: none;
  }

  .qa-answer {
    color: #333;
  }

  .faq-link {
    color: #0055AA;
  }

  .doc-card,
  .guide-steps li {
    background: #f5f5f5;
    border-color: #ccc;
  }

  .doc-badge {
    background: #333;
    color: #fff;
  }
}