.page-faq {
  --faq-index-w: 280px;
  padding-top: 88px;
  color: var(--y-text);
  font-family: var(--y-font-body);
  overflow-x: hidden;
}

/* FAQ 头部 */
.page-faq .faq-head {
  margin-bottom: 40px;
  position: relative;
}

.page-faq .faq-head::after {
  content: "";
  display: block;
  height: 3px;
  margin-top: 32px;
  background: linear-gradient(90deg, var(--y-accent) 0%, var(--y-border) 45%, transparent 90%);
  clip-path: polygon(0 0, 100% 0, calc(100% - 28px) 100%, 0 100%);
}

.page-faq .breadcrumb ol {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0 0 20px;
  padding: 0;
}

.page-faq .breadcrumb li {
  font-size: 13px;
  color: var(--y-muted);
}

.page-faq .breadcrumb a {
  color: var(--y-muted);
  text-decoration: none;
  transition: color 0.2s ease;
}

.page-faq .breadcrumb a:hover {
  color: var(--y-accent);
}

.page-faq .breadcrumb__sep {
  color: var(--y-border);
}

.page-faq .section-label {
  margin-top: 24px;
  letter-spacing: 0.12em;
}

.page-faq .faq-head__title {
  margin: 12px 0 16px;
  max-width: 780px;
  font-family: var(--y-font-head);
  font-size: clamp(28px, 6vw, 44px);
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.page-faq .faq-head__lead {
  max-width: 680px;
  margin: 0 0 24px;
  color: var(--y-muted);
  font-size: 16px;
  line-height: 1.75;
}

.page-faq .faq-doc-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-faq .faq-doc-meta__item {
  padding: 4px 10px;
  border: 1px solid var(--y-border);
  background: var(--y-surface);
  color: var(--y-muted);
  font-family: var(--y-font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
}

/* 页面主体两栏 */
.page-faq .faq-shell {
  min-width: 0;
}

/* 侧栏目录 */
.page-faq .faq-side {
  margin-bottom: 32px;
}

.page-faq .faq-side__label {
  margin: 0 0 12px;
  font-family: var(--y-font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--y-signal);
}

.page-faq .faq-index {
  display: flex;
  gap: 8px;
  list-style: none;
  margin: 0 0 16px;
  padding: 0 0 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-faq .faq-index li {
  flex-shrink: 0;
}

.page-faq .faq-index a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border: 1px dashed var(--y-border);
  background: rgba(30, 36, 64, 0.5);
  color: var(--y-muted);
  font-size: 13px;
  text-decoration: none;
  white-space: nowrap;
  transition: border-color 0.2s ease, color 0.2s ease, background 0.2s ease;
}

.page-faq .faq-index a span {
  font-family: var(--y-font-mono);
  font-size: 12px;
  color: var(--y-accent);
}

.page-faq .faq-index a:hover {
  border-color: var(--y-accent);
  background: rgba(57, 255, 20, 0.07);
  color: var(--y-text);
}

.page-faq .faq-side__card {
  border: 1px solid var(--y-border);
  border-top: 3px solid var(--y-signal);
  padding: 16px;
  background: var(--y-surface);
}

.page-faq .faq-side__card-title {
  margin: 0 0 6px;
  font-family: var(--y-font-head);
  font-size: 16px;
  font-weight: 700;
}

.page-faq .faq-side__card-text {
  margin: 0 0 14px;
  color: var(--y-muted);
  font-size: 13px;
  line-height: 1.6;
}

/* 问答内容 */
.page-faq .faq-content {
  min-width: 0;
}

.page-faq .faq-section + .faq-section {
  position: relative;
  margin-top: 56px;
  padding-top: 44px;
  border-top: 1px dashed var(--y-border);
}

.page-faq .faq-section + .faq-section::before {
  content: "";
  position: absolute;
  top: -8px;
  left: 0;
  width: 52px;
  height: 15px;
  background: var(--y-signal);
  clip-path: polygon(0 0, 100% 0, calc(100% - 8px) 100%, 0 100%);
}

.page-faq .faq-section__head {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 20px;
}

.page-faq .faq-section__head:target-within,
.page-faq .faq-section:target .faq-section__head {
  padding-left: 12px;
  background: linear-gradient(90deg, rgba(57, 255, 20, 0.08), transparent);
}

.page-faq .faq-section__idx {
  flex-shrink: 0;
  font-family: var(--y-font-mono);
  font-size: clamp(40px, 8vw, 60px);
  font-weight: 700;
  line-height: 0.9;
  letter-spacing: -0.04em;
  color: transparent;
  -webkit-text-stroke: 1px var(--y-accent);
}

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

.page-faq .faq-section__title h2 {
  position: relative;
  margin: 4px 0;
  padding-left: 14px;
  font-family: var(--y-font-head);
  font-size: clamp(22px, 4vw, 30px);
  line-height: 1.25;
}

.page-faq .faq-section__title h2::before {
  content: "";
  position: absolute;
  top: 4px;
  bottom: 4px;
  left: 0;
  width: 4px;
  background: linear-gradient(180deg, var(--y-accent), transparent);
}

.page-faq .faq-section__title p {
  margin: 0;
  padding-left: 14px;
  font-family: var(--y-font-mono);
  font-size: 13px;
  color: var(--y-muted);
}

/* 折叠面板 */
.page-faq .faq-item {
  border-bottom: 1px dashed var(--y-border);
}

.page-faq .faq-item:first-of-type {
  border-top: 1px dashed var(--y-border);
}

.page-faq .faq-item summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 18px 8px 18px 4px;
  background: transparent;
  box-shadow: inset 3px 0 0 transparent;
  cursor: pointer;
  list-style: none;
  transition: box-shadow 0.2s ease, background 0.2s ease;
}

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

.page-faq .faq-item summary:hover,
.page-faq .faq-item[open] summary {
  background: rgba(57, 255, 20, 0.045);
  box-shadow: inset 3px 0 0 var(--y-accent);
}

.page-faq .faq-item summary:focus-visible {
  outline: 2px solid var(--y-accent);
  outline-offset: -2px;
}

.page-faq .faq-item__idx {
  flex-shrink: 0;
  padding: 2px 6px;
  border: 1px solid var(--y-border);
  background: var(--y-bg);
  font-family: var(--y-font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--y-muted);
  transition: border-color 0.2s ease, color 0.2s ease;
}

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

.page-faq .faq-item__q {
  flex: 1;
  min-width: 0;
  margin: 0;
  font-family: var(--y-font-body);
  font-size: 16px;
  font-weight: 500;
  line-height: 1.45;
  color: var(--y-text);
  transition: color 0.2s ease;
}

.page-faq .faq-item[open] .faq-item__q {
  color: var(--y-accent);
}

.page-faq .faq-item__mark {
  position: relative;
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  margin-left: auto;
  border: 1px solid var(--y-border);
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.page-faq .faq-item__mark::before,
.page-faq .faq-item__mark::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  background: var(--y-muted);
  transition: background 0.2s ease;
}

.page-faq .faq-item__mark::before {
  width: 10px;
  height: 2px;
  transform: translate(-50%, -50%);
}

.page-faq .faq-item__mark::after {
  width: 2px;
  height: 10px;
  transform: translate(-50%, -50%);
}

.page-faq .faq-item[open] .faq-item__mark {
  border-color: var(--y-signal);
  transform: rotate(45deg);
}

.page-faq .faq-item[open] .faq-item__mark::before,
.page-faq .faq-item[open] .faq-item__mark::after {
  background: var(--y-signal);
}

.page-faq .faq-item__body {
  padding: 4px 8px 22px 40px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--y-muted);
  animation: faqFade 0.24s ease both;
}

.page-faq .faq-item__body p {
  margin: 0 0 12px;
}

.page-faq .faq-item__body a {
  color: var(--y-accent);
  text-decoration: underline;
  text-decoration-style: dashed;
  text-underline-offset: 4px;
  transition: color 0.2s ease;
}

.page-faq .faq-item__body a:hover {
  color: var(--y-signal);
}

/* 步骤与排查清单 */
.page-faq .faq-steps {
  display: grid;
  gap: 8px;
  margin: 8px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-steps li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 10px 12px;
  background: rgba(30, 36, 64, 0.5);
  border-left: 3px solid var(--y-accent-dim);
  font-size: 13px;
  line-height: 1.5;
  color: var(--y-text);
  transition: border-color 0.2s ease, background 0.2s ease, transform 0.2s ease;
}

.page-faq .faq-steps li:hover {
  border-left-color: var(--y-accent);
  background: rgba(57, 255, 20, 0.07);
  transform: translateX(2px);
}

.page-faq .faq-step__idx {
  flex-shrink: 0;
  font-family: var(--y-font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  white-space: nowrap;
  color: var(--y-accent);
}

/* 插图 */
.page-faq .faq-fig {
  margin: 28px 0 0;
  padding: 8px;
  border: 1px solid var(--y-border);
  background: var(--y-surface);
}

.page-faq .faq-fig img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-faq .faq-fig--ratio-8-5 img {
  aspect-ratio: 8 / 5;
}

.page-faq .faq-fig__caption {
  margin: 10px 4px 4px;
  font-family: var(--y-font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--y-muted);
}

/* 动效 */
@keyframes faqFade {
  from {
    opacity: 0;
    transform: translateY(-6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* 桌面端两栏与 sticky 目录 */
@media (min-width: 1024px) {
  .page-faq {
    padding-top: 120px;
  }

  .page-faq .faq-shell {
    display: grid;
    grid-template-columns: var(--faq-index-w) minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }

  .page-faq .faq-side {
    position: sticky;
    top: calc(var(--y-header-h) + 24px);
    margin: 0;
  }

  .page-faq .faq-index {
    display: block;
    margin: 0 0 24px;
    padding: 0;
    overflow: visible;
  }

  .page-faq .faq-index li {
    margin-bottom: 8px;
  }

  .page-faq .faq-index a {
    justify-content: flex-start;
    white-space: normal;
  }

  .page-faq .faq-side__card {
    margin-top: 24px;
  }
}