/* ========== FAQ 帮助中心页面专属样式 ========== */
.page-faq {
  background: var(--color-space);
  color: var(--color-light);
  font-family: var(--font-main);
  line-height: 1.6;
  overflow-x: clip;
}

/* ---- 页面头部 ---- */
.page-faq__hero {
  position: relative;
  border-bottom: 1px solid var(--color-line);
  padding: 32px 0 48px;
  overflow: hidden;
}

.page-faq__hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, var(--color-line) 1px, transparent 1px),
    linear-gradient(0deg, var(--color-line) 1px, transparent 1px);
  background-size: 48px 48px;
  opacity: 0.22;
  pointer-events: none;
}

.page-faq__hero::after {
  content: '';
  position: absolute;
  top: -120px;
  right: -80px;
  width: 420px;
  height: 420px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(123, 47, 234, 0.22), transparent 62%);
  pointer-events: none;
}

.page-faq__crumbs {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--color-muted);
  position: relative;
  z-index: 1;
  margin-bottom: 28px;
}

.page-faq__crumb-link {
  color: var(--color-muted);
  text-decoration: none;
  transition: color var(--t-fast);
}

.page-faq__crumb-link:hover {
  color: var(--color-neon);
}

.page-faq__crumb-current {
  color: var(--color-light);
}

.page-faq__hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
}

.page-faq__kicker {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--color-purple-soft);
  text-transform: uppercase;
  margin: 0 0 12px;
}

.page-faq__mono {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--color-purple-soft);
}

.page-faq__hero-pulse {
  width: 8px;
  height: 8px;
  background: var(--color-neon);
  display: inline-block;
  border-radius: 50%;
  animation: page-faq-pulse 2.4s ease-in-out infinite;
}

@keyframes page-faq-pulse {
  0%, 100% { opacity: 1; box-shadow: 0 0 0 0 rgba(0, 255, 157, 0.4); }
  50% { opacity: 0.55; box-shadow: 0 0 0 6px rgba(0, 255, 157, 0); }
}

.page-faq__hero-title {
  font-size: var(--fs-h1);
  font-weight: 900;
  line-height: 1.2;
  margin: 0 0 16px;
  max-width: 640px;
}

.page-faq__hero-desc {
  font-size: 15px;
  color: var(--color-muted);
  line-height: 1.7;
  margin: 0 0 24px;
  max-width: 560px;
}

.page-faq__search {
  display: flex;
  align-items: center;
  gap: 12px;
  border: 1px solid var(--color-line);
  background: rgba(21, 26, 51, 0.72);
  padding: 12px 16px;
  max-width: 460px;
  transition: border-color var(--t-base);
}

.page-faq__search:hover {
  border-color: var(--color-purple);
}

.page-faq__search-icon {
  color: var(--color-purple-soft);
  flex-shrink: 0;
}

.page-faq__search-field {
  flex: 1;
  font-size: 14px;
  color: var(--color-muted);
  letter-spacing: 0.02em;
}

.page-faq__search-key {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-purple);
  border: 1px solid var(--color-line);
  padding: 3px 7px;
  letter-spacing: 0.1em;
  flex-shrink: 0;
}

.page-faq__hero-media {
  margin: 0;
  border-left: 4px solid var(--color-purple);
  background: var(--color-card);
  width: 100%;
}

.page-faq__hero-media img {
  display: block;
  width: 100%;
  max-width: 600px;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
}

/* ---- 数据条 ---- */
.page-faq__stat-strip {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0;
  border: 1px solid var(--color-line);
  background: var(--color-card);
  margin-bottom: 48px;
}

.page-faq__stat-item {
  padding: 18px 16px;
  border: 1px solid var(--color-line);
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-faq__stat-num {
  font-family: var(--font-mono);
  font-size: 28px;
  font-weight: 700;
  color: var(--color-neon);
  line-height: 1.1;
}

.page-faq__stat-label {
  font-size: 12px;
  color: var(--color-muted);
  letter-spacing: 0.04em;
}

/* ---- 主体布局 ---- */
.page-faq__body {
  padding: 48px 0 80px;
}

.page-faq__layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 40px;
  align-items: start;
}

/* ---- 索引侧栏 ---- */
.page-faq__index {
  border: 1px solid var(--color-line);
  background: var(--color-card);
  padding: 20px;
}

.page-faq__index-title {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-line);
  margin-bottom: 8px;
}

.page-faq__index-sub {
  font-size: 12px;
  color: var(--color-muted);
  letter-spacing: 0.06em;
}

.page-faq__index-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-faq__index-item {
  border-bottom: 1px solid rgba(46, 58, 94, 0.6);
}

.page-faq__index-item:last-child {
  border-bottom: none;
}

.page-faq__index-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 4px;
  color: var(--color-light);
  text-decoration: none;
  font-size: 14px;
  transition: background var(--t-fast), color var(--t-fast);
}

.page-faq__index-link:hover {
  color: var(--color-neon);
  background: rgba(0, 255, 157, 0.04);
}

.page-faq__index-num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-purple-soft);
  min-width: 26px;
}

/* ---- 内容区 ---- */
.page-faq__content {
  min-width: 0;
}

.page-faq__section + .page-faq__section {
  margin-top: 72px;
}

.page-faq__section-head {
  margin-bottom: 28px;
}

.page-faq .dossier__head {
  display: flex;
  align-items: flex-start;
  gap: 16px;
}

.page-faq .dossier__index {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  color: var(--color-light);
  background: var(--color-purple);
  padding: 4px 8px;
  line-height: 1.2;
  flex-shrink: 0;
}

.page-faq .dossier__title {
  font-size: var(--fs-h2);
  font-weight: 900;
  margin: 0 0 6px;
}

.page-faq .dossier__desc {
  font-size: 14px;
  color: var(--color-muted);
  margin: 0;
}

/* ---- 筛选按钮 ---- */
.page-faq__filter-wrap {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 20px;
}

.page-faq__filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-faq .filter-btn {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  padding: 6px 14px;
  border: 1px solid var(--color-line);
  background: transparent;
  color: var(--color-muted);
  cursor: pointer;
  transition: border-color var(--t-fast), background var(--t-fast), color var(--t-fast);
  border-radius: 0;
}

.page-faq .filter-btn:hover {
  border-color: var(--color-purple);
  color: var(--color-light);
}

.page-faq .filter-btn.is-active {
  border-color: var(--color-purple);
  background: var(--color-purple);
  color: #fff;
}

.page-faq__filter-legend {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-muted);
}

/* ---- FAQ 折叠区 ---- */
.page-faq__qa-list {
  border-top: 1px solid var(--color-line);
}

.page-faq__qa-item {
  border-bottom: 1px solid var(--color-line);
  min-width: 0;
}

.page-faq__qa-item summary {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 18px 4px;
  cursor: pointer;
  transition: background var(--t-fast);
  user-select: none;
}

.page-faq__qa-item summary::-webkit-details-marker {
  display: none;
}

.page-faq__qa-item summary:hover {
  background: rgba(123, 47, 234, 0.06);
}

.page-faq__qa-num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-purple-soft);
  min-width: 44px;
  flex-shrink: 0;
}

.page-faq__qa-title {
  flex: 1;
  font-size: 15px;
  font-weight: 700;
  color: var(--color-light);
  min-width: 0;
}

.page-faq__qa-toggle {
  width: 20px;
  height: 20px;
  position: relative;
  flex-shrink: 0;
}

.page-faq__qa-toggle::before,
.page-faq__qa-toggle::after {
  content: '';
  position: absolute;
  background: var(--color-purple-soft);
}

.page-faq__qa-toggle::before {
  width: 12px;
  height: 2px;
  top: 9px;
  left: 4px;
}

.page-faq__qa-toggle::after {
  width: 2px;
  height: 12px;
  top: 4px;
  left: 9px;
}

.page-faq__qa-item[open] .page-faq__qa-toggle::after {
  display: none;
}

.page-faq__qa-answer {
  padding: 2px 4px 20px 58px;
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.7;
  max-width: 720px;
}

.page-faq__qa-answer p {
  margin: 0;
}

/* ---- 帮助文档索引 ---- */
.page-faq__docs-note {
  font-size: 14px;
  color: var(--color-muted);
  background: rgba(21, 26, 51, 0.6);
  border-left: 3px solid var(--color-purple);
  padding: 14px 16px;
  margin: 0 0 24px;
  line-height: 1.7;
}

.page-faq__doc-grid {
  gap: 16px;
  grid-template-columns: minmax(0, 1fr);
}

.page-faq .file-card {
  background: var(--color-card);
  border: 1px solid var(--color-line);
  padding: 18px;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  transition: transform var(--t-base), border-color var(--t-base);
}

.page-faq .file-card:hover {
  transform: translateY(-3px);
  border-color: var(--color-purple);
}

.page-faq .file-card__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  margin-bottom: 12px;
}

.page-faq__doc-code {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-muted);
  letter-spacing: 0.08em;
}

.page-faq .file-card__title {
  font-size: 17px;
  font-weight: 700;
  margin: 0 0 8px;
}

.page-faq .file-card__text {
  font-size: 13px;
  color: var(--color-muted);
  line-height: 1.6;
  margin: 0 0 14px;
  flex: 1;
}

.page-faq__doc-link {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--color-neon);
  text-decoration: none;
  letter-spacing: 0.03em;
  transition: color var(--t-fast);
}

.page-faq__doc-link:hover {
  color: var(--color-light);
}

.page-faq__keywords {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--color-line);
}

.page-faq .label-tag {
  font-family: var(--font-mono);
  font-size: 12px;
}

/* ---- 资源下载 ---- */
.page-faq__download-wrap {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
}

.page-faq__download-intro {
  background: linear-gradient(135deg, #151A33 0%, #0B1026 100%);
  border: 1px solid var(--color-line);
  padding: 24px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.page-faq__download-media {
  margin: 0 0 18px;
  width: 100%;
  background: var(--color-space);
}

.page-faq__download-media img {
  display: block;
  width: 100%;
  max-width: 300px;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-faq__download-text {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.7;
  margin: 0 0 18px;
}

.page-faq__download-cta {
  width: 100%;
  text-align: center;
  font-weight: 700;
  letter-spacing: 0.04em;
  border-radius: 0;
}

.page-faq__download-list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  align-items: stretch;
}

.page-faq__download-item {
  border: 1px solid var(--color-line);
  padding: 18px 20px;
  background: rgba(21, 26, 51, 0.6);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  transition: border-color var(--t-base);
}

.page-faq__download-item:hover {
  border-color: var(--color-purple);
}

.page-faq__download-item-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  width: 100%;
  margin-bottom: 10px;
}

.page-faq__download-format {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  color: var(--color-orange);
  border: 1px solid rgba(255, 108, 0, 0.35);
  padding: 2px 6px;
  letter-spacing: 0.1em;
}

.page-faq__download-meta {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-muted);
  letter-spacing: 0.06em;
}

.page-faq__download-name {
  font-size: 17px;
  font-weight: 700;
  margin: 0 0 6px;
}

.page-faq__download-desc {
  font-size: 13px;
  color: var(--color-muted);
  margin: 0 0 12px;
  line-height: 1.6;
  flex: 1;
}

.page-faq__download-link {
  font-size: 13px;
  padding: 7px 16px;
  border-radius: 0;
}

/* ---- 联系客服 ---- */
.page-faq__contact-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-faq__contact-card {
  border: 1px solid var(--color-line);
  background: var(--color-card);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.page-faq__contact-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--color-purple-soft);
  text-transform: uppercase;
}

.page-faq__contact-value {
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 700;
  color: var(--color-light);
  word-break: break-all;
  line-height: 1.4;
}

.page-faq__contact-note {
  font-size: 12px;
  color: var(--color-muted);
}

.page-faq__contact-card--action {
  justify-content: center;
  align-items: flex-start;
  gap: 10px;
}

.page-faq__contact-card--action p {
  font-size: 13px;
  color: var(--color-muted);
  margin: 0;
}

.page-faq__contact-card--action .btn {
  font-size: 14px;
  padding: 9px 20px;
  border-radius: 0;
}

/* ===== 桌面端增强 ===== */
@media (min-width: 900px) {
  .page-faq__hero {
    padding: 48px 0 72px;
  }

  .page-faq__hero-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: center;
    gap: 56px;
  }

  .page-faq__hero-title {
    font-size: var(--fs-display);
    max-width: 560px;
  }

  .page-faq__hero-desc {
    font-size: 16px;
    max-width: 520px;
  }

  .page-faq__hero-media {
    justify-self: end;
    box-shadow: 12px 12px 0 rgba(123, 47, 234, 0.18);
  }

  .page-faq__hero-media img {
    width: 600px;
    height: 300px;
  }

  .page-faq__stat-strip {
    grid-template-columns: repeat(4, 1fr);
    margin-bottom: 72px;
  }

  .page-faq__stat-item {
    padding: 22px 20px;
  }

  .page-faq__body {
    padding: 72px 0 100px;
  }

  .page-faq__layout {
    grid-template-columns: 260px minmax(0, 1fr);
    gap: 56px;
  }

  .page-faq__index {
    position: sticky;
    top: 128px;
    padding: 24px;
  }

  .page-faq__doc-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-faq__download-wrap {
    grid-template-columns: 320px minmax(0, 1fr);
    gap: 20px;
    align-items: stretch;
  }

  .page-faq__download-cta {
    width: auto;
  }

  .page-faq__contact-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }

  .page-faq__contact-card--span2 {
    grid-column: span 2;
  }

  .page-faq__contact-value {
    font-size: 18px;
  }
}

@media (min-width: 1200px) {
  .page-faq__download-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}