.page-faq {
  --faq-track: rgba(11, 14, 20, .55);
}

/* 首屏 */
.page-faq .guide-head {
  padding: clamp(26px, 5vw, 56px) 0 clamp(20px, 3vw, 34px);
  border-bottom: 1px solid var(--line);
  margin-bottom: clamp(28px, 4vw, 44px);
}

.page-faq .guide-head h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(30px, 6.4vw, 62px);
  line-height: 1.03;
  letter-spacing: -.03em;
  color: var(--paper);
  margin: 12px 0 0;
  max-width: 17ch;
}

.page-faq .guide-head .section-lead {
  margin: 20px 0 0;
  max-width: 62ch;
  font-size: clamp(15px, 1.5vw, 17.5px);
  line-height: 1.78;
  color: var(--silver);
}

.page-faq .guide-facts {
  list-style: none;
  margin: 26px 0 0;
  padding: 14px 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 30px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--muted);
}

.page-faq .guide-facts b {
  color: var(--lime);
  font-weight: 700;
  font-size: 13.5px;
}

.page-faq .guide-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 14px;
  margin-top: 20px;
}

.page-faq .guide-links a {
  display: inline-block;
  padding: 8px 14px;
  font-size: 13.5px;
  color: var(--silver);
  text-decoration: none;
  border: 1px solid var(--line-strong);
  border-radius: var(--r);
  transition: color .15s var(--ease), border-color .15s var(--ease), background .15s var(--ease);
}

.page-faq .guide-links a:hover,
.page-faq .guide-links a:focus-visible {
  color: var(--ink);
  background: var(--lime);
  border-color: var(--lime);
}

/* 主体两栏 */
.page-faq .guide-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 30px;
  padding-bottom: clamp(56px, 8vw, 96px);
}

/* 左栏索引 */
.page-faq .guide-index {
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-radius: var(--r);
  padding: 18px 16px;
}

.page-faq .index-title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-faq .index-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-faq .index-list a {
  display: block;
  padding: 9px 8px 9px 14px;
  font-size: 13.5px;
  line-height: 1.4;
  color: var(--silver);
  text-decoration: none;
  border-left: 2px solid var(--line);
  border-radius: 0 var(--r) var(--r) 0;
  transition: color .15s var(--ease), border-color .15s var(--ease), background .15s var(--ease);
}

.page-faq .index-list a:hover,
.page-faq .index-list a:focus-visible {
  color: var(--paper);
  border-left-color: var(--lime);
  background: rgba(180, 255, 58, .07);
}

.page-faq .index-foot {
  margin: 16px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--muted);
}

/* 章节 */
.page-faq .guide-section {
  padding-bottom: clamp(34px, 5vw, 52px);
}

.page-faq .guide-section + .guide-section,
.page-faq .action-strip + .guide-section {
  border-top: 1px solid var(--line);
  padding-top: clamp(30px, 4.5vw, 46px);
}

.page-faq .sec-head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 16px;
}

.page-faq .sec-num {
  flex: none;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .1em;
  color: var(--blue-2);
  border: 1px solid var(--line-strong);
  border-radius: var(--r);
  padding: 3px 7px;
}

.page-faq .sec-head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(21px, 3.4vw, 33px);
  line-height: 1.16;
  letter-spacing: -.022em;
  color: var(--paper);
}

.page-faq .sec-text {
  margin: 0 0 22px;
  max-width: 68ch;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--silver);
}

/* 三步上手 */
.page-faq .step-flow {
  display: grid;
  gap: 16px;
  margin: 4px 0 26px;
}

.page-faq .step {
  position: relative;
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-radius: var(--r);
  padding: 22px 18px 24px;
  transition: transform .15s var(--ease), border-color .15s var(--ease);
}

.page-faq .step::before {
  content: "";
  position: absolute;
  top: -1px;
  left: -1px;
  right: -1px;
  height: 3px;
  background: linear-gradient(90deg, var(--blue), var(--blue-2));
}

.page-faq .step:hover {
  transform: translateY(-4px);
  border-color: var(--blue);
}

.page-faq .step-tag {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--lime);
}

.page-faq .step h3 {
  margin: 0 0 9px;
  font-family: var(--font-display);
  font-size: 17px;
  line-height: 1.32;
  letter-spacing: -.012em;
  color: var(--paper);
}

.page-faq .step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--muted);
}

/* 清单 */
.page-faq .check-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 13px;
}

.page-faq .check-list li {
  position: relative;
  padding-left: 22px;
  max-width: 70ch;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--silver);
}

.page-faq .check-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 7px;
  height: 7px;
  background: var(--blue-2);
}

.page-faq .check-list strong {
  color: var(--paper);
  font-weight: 700;
}

/* 图例 */
.page-faq .legend {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 26px;
  margin-top: 22px;
  padding: 14px 16px;
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-radius: var(--r);
}

.page-faq .legend-item {
  display: flex;
  align-items: center;
  gap: 9px;
  font-size: 13.5px;
  color: var(--silver);
}

.page-faq .legend-swatch {
  flex: none;
  width: 12px;
  height: 12px;
  border-radius: 1px;
}

.page-faq .legend-swatch--new {
  background: var(--lime);
}

.page-faq .legend-swatch--old {
  background: var(--magenta);
}

/* 操作提示条 */
.page-faq .action-strip {
  margin: 6px 0 clamp(30px, 4.5vw, 46px);
  padding: 16px 18px;
  border-left: 3px solid var(--lime);
  border-radius: 0 var(--r) var(--r) 0;
  background: linear-gradient(90deg, rgba(0, 102, 255, .18), rgba(180, 255, 58, .06) 68%, transparent);
}

.page-faq .action-strip-title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--lime);
}

.page-faq .action-track {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  padding-bottom: 4px;
  scrollbar-width: thin;
}

.page-faq .action-track span {
  flex: none;
  white-space: nowrap;
  padding: 7px 12px;
  font-size: 13px;
  color: var(--silver);
  background: var(--faq-track);
  border: 1px solid var(--line-strong);
  border-radius: var(--r);
}

/* 研究板 */
.page-faq .board {
  margin-top: 6px;
}

/* 问答组 */
.page-faq .qa-list {
  margin-top: 6px;
  border-top: 1px solid var(--line);
}

.page-faq .qa-group {
  border-bottom: 1px solid var(--line);
}

.page-faq .qa-group > summary {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 17px 4px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16.5px;
  letter-spacing: -.012em;
  color: var(--silver);
  transition: color .15s var(--ease);
}

.page-faq .qa-group > summary::-webkit-details-marker {
  display: none;
}

.page-faq .qa-group > summary::before {
  content: "";
  flex: none;
  width: 8px;
  height: 8px;
  border-right: 2px solid var(--muted);
  border-bottom: 2px solid var(--muted);
  transform: rotate(45deg) translate(-2px, -2px);
  transition: transform .2s var(--ease), border-color .15s var(--ease);
}

.page-faq .qa-group > summary:hover,
.page-faq .qa-group > summary:focus-visible {
  color: var(--paper);
}

.page-faq .qa-group[open] > summary {
  color: var(--paper);
}

.page-faq .qa-group[open] > summary::before {
  transform: rotate(225deg) translate(-1px, -1px);
  border-color: var(--lime);
}

.page-faq .qa-body {
  display: grid;
  gap: 16px;
  padding: 2px 4px 24px;
}

.page-faq .qa-item {
  padding-left: 16px;
  border-left: 1px solid var(--line);
}

.page-faq .qa-q {
  margin: 0 0 6px;
  font-size: 14.5px;
  font-weight: 700;
  line-height: 1.6;
  color: var(--silver);
}

.page-faq .qa-a {
  margin: 0;
  max-width: 68ch;
  font-size: 14px;
  line-height: 1.78;
  color: var(--muted);
}

/* 结尾求助 */
.page-faq .guide-help {
  margin-top: clamp(34px, 5vw, 52px);
  padding: clamp(22px, 3.5vw, 32px);
  background: var(--ink-2);
  border: 1px solid var(--line-strong);
  border-top: 3px solid var(--blue);
  border-radius: var(--r);
}

.page-faq .guide-help h2 {
  margin: 10px 0 12px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(20px, 3vw, 28px);
  line-height: 1.2;
  letter-spacing: -.022em;
  color: var(--paper);
}

.page-faq .guide-help > p {
  margin: 0;
  max-width: 64ch;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--silver);
}

.page-faq .help-lines {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-faq .help-lines li {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--paper);
}

.page-faq .help-lines b {
  flex: none;
  padding: 3px 8px;
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--ink);
  background: var(--lime);
  border-radius: var(--r);
}

.page-faq .help-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

/* 图片容器 */
.page-faq .figure {
  margin: 24px 0 0;
}

.page-faq .figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--r);
}

.page-faq .figure-cap {
  margin-top: 10px;
  padding-left: 12px;
  border-left: 2px solid var(--lime);
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--muted);
}

/* 响应式 */
@media (min-width: 780px) {
  .page-faq .step-flow {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }

  .page-faq .step + .step::after {
    content: "";
    position: absolute;
    left: -16px;
    top: 50%;
    width: 16px;
    height: 1px;
    background: var(--line-strong);
  }

  .page-faq .grid-faq,
  .page-faq .check-list {
    gap: 14px;
  }
}

@media (min-width: 960px) {
  .page-faq .guide-layout {
    grid-template-columns: 236px minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }

  .page-faq .guide-index {
    position: sticky;
    top: 96px;
    padding: 20px 18px;
  }

  .page-faq .qa-body {
    padding-left: 8px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .step,
  .page-faq .index-list a,
  .page-faq .guide-links a,
  .page-faq .qa-group > summary,
  .page-faq .qa-group > summary::before {
    transition: none;
  }

  .page-faq .step:hover {
    transform: none;
  }
}