.page-faq {
  --faq-rule: rgba(127, 168, 201, 0.24);
  --faq-rule-strong: rgba(127, 168, 201, 0.44);

  display: block;
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
  padding: 22px 16px 84px;
  box-sizing: border-box;
  overflow-x: hidden;
  background: var(--navy-900);
  color: var(--bright);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.9;
  -webkit-font-smoothing: antialiased;
}

.page-faq *,
.page-faq *::before,
.page-faq *::after {
  box-sizing: border-box;
}

/* ---------- 面包屑 ---------- */
.page-faq .breadcrumbs {
  margin: 0 0 18px;
}

.page-faq .crumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
}

.page-faq .crumb-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

.page-faq .crumb-item + .crumb-item::before {
  content: "/";
  color: var(--frost);
  opacity: 0.55;
}

.page-faq .crumb-link {
  color: var(--frost);
  text-decoration: none;
}

.page-faq .crumb-link:hover,
.page-faq .crumb-link:focus-visible {
  color: var(--cyan);
}

.page-faq .crumb-current {
  color: var(--bright);
}

/* ---------- 页头 ---------- */
.page-faq .faq-head {
  position: relative;
  padding: 26px 0 0;
  border-top: 1px solid var(--faq-rule);
}

.page-faq .faq-head::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 76px;
  height: 2px;
  background: var(--amber);
}

.page-faq .faq-eyebrow {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--frost);
}

.page-faq .faq-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(27px, 7.4vw, 42px);
  font-weight: 900;
  line-height: 1.24;
  letter-spacing: -0.01em;
  color: var(--bright);
  text-wrap: balance;
}

.page-faq .faq-lede {
  margin: 16px 0 0;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.9;
  color: var(--bright);
  opacity: 0.9;
}

.page-faq .faq-metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin: 26px 0 0;
  padding: 0;
  background: var(--faq-rule);
  border: 1px solid var(--faq-rule);
  border-radius: var(--radius-m);
  overflow: hidden;
}

.page-faq .faq-metrics > div {
  padding: 12px 12px 14px;
  background: var(--navy-800);
}

.page-faq .faq-metrics dt {
  margin: 0 0 4px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--frost);
}

.page-faq .faq-metrics dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--bright);
}

.page-faq .faq-metrics > div:first-child dd {
  color: var(--amber);
}

/* ---------- 分组跳转胶囊 ---------- */
.page-faq .faq-jump {
  display: flex;
  gap: 8px;
  margin: 26px -16px 0;
  padding: 4px 16px 12px;
  overflow-x: auto;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.page-faq .faq-jump::-webkit-scrollbar {
  height: 4px;
}

.page-faq .faq-jump::-webkit-scrollbar-thumb {
  background: var(--faq-rule-strong);
  border-radius: var(--radius-pill);
}

.page-faq .jump-item {
  position: relative;
  flex: 0 0 auto;
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 9px 15px 9px 17px;
  border: 1px solid var(--faq-rule);
  border-radius: var(--radius-pill);
  background: var(--navy-800);
  color: var(--frost);
  font-size: 14px;
  font-weight: 600;
  line-height: 1.4;
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-faq .jump-item::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 50%;
  width: 3px;
  height: 17px;
  border-radius: 2px;
  background: var(--cyan);
  opacity: 0;
  transform: translateY(-50%) scaleY(0.3);
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-faq .jump-item:hover,
.page-faq .jump-item:focus-visible {
  color: var(--bright);
  border-color: var(--faq-rule-strong);
}

.page-faq .jump-item[aria-current="location"] {
  color: var(--bright);
  background: var(--navy-700);
  border-color: rgba(75, 224, 208, 0.5);
}

.page-faq .jump-item[aria-current="location"]::before {
  opacity: 1;
  transform: translateY(-50%) scaleY(1);
}

.page-faq .jump-num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--amber);
}

.page-faq .jump-count {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--frost);
}

/* ---------- 双路径分支图 ---------- */
.page-faq .faq-fork {
  margin: 28px 0 0;
  padding: 18px 16px 14px;
  border: 1px solid var(--faq-rule);
  border-radius: var(--radius-m);
  background: linear-gradient(180deg, rgba(27, 58, 87, 0.6), rgba(11, 24, 38, 0.25));
}

.page-faq .fork-svg {
  display: block;
  width: 100%;
  height: auto;
  max-height: 260px;
}

.page-faq .fork-link {
  stroke: var(--frost);
  stroke-width: 1.4;
  opacity: 0.45;
}

.page-faq .fork-node-src {
  fill: var(--navy-700);
  stroke: var(--amber);
  stroke-width: 1.6;
}

.page-faq .fork-t-src {
  fill: var(--amber);
  font-family: var(--font-mono);
  font-size: 13px;
}

.page-faq .fork-box-cyan {
  fill: rgba(75, 224, 208, 0.1);
  stroke: rgba(75, 224, 208, 0.55);
  stroke-width: 1.4;
}

.page-faq .fork-box-amber {
  fill: rgba(242, 163, 60, 0.1);
  stroke: rgba(242, 163, 60, 0.55);
  stroke-width: 1.4;
}

.page-faq .fork-box-dim {
  fill: rgba(127, 168, 201, 0.06);
  stroke: rgba(127, 168, 201, 0.3);
  stroke-width: 1.2;
}

.page-faq .fork-t {
  fill: var(--bright);
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 600;
}

.page-faq .fork-caption {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--frost);
}

/* ---------- 分组骨架 ---------- */
.page-faq .faq-group {
  margin: 48px 0 0;
  scroll-margin-top: 96px;
}

.page-faq .group-head {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--faq-rule);
}

.page-faq .group-num {
  flex: 0 0 auto;
  padding: 2px 7px;
  border: 1px solid rgba(242, 163, 60, 0.42);
  border-radius: var(--radius-s);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--amber);
}

.page-faq .group-title {
  flex: 1 1 auto;
  min-width: 0;
  margin: 0;
  font-family: var(--font-display);
  font-size: 21px;
  font-weight: 800;
  line-height: 1.35;
  letter-spacing: -0.005em;
  color: var(--bright);
}

.page-faq .group-count {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--frost);
  white-space: nowrap;
}

.page-faq .group-note {
  margin: 12px 0 18px;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.9;
  color: var(--frost);
}

/* ---------- 问答条目 ---------- */
.page-faq .qa-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin: 0;
  padding: 0;
}

.page-faq .qa {
  border: 1px solid var(--faq-rule);
  border-radius: var(--radius-m);
  background: var(--navy-800);
  overflow: hidden;
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-faq .qa[open] {
  border-color: var(--faq-rule-strong);
  background: var(--navy-700);
}

.page-faq .qa-summary {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 13px 14px;
  list-style: none;
  cursor: pointer;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.6;
  color: var(--bright);
}

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

.page-faq .qa-summary::marker {
  content: "";
}

.page-faq .qa-summary:hover {
  color: var(--cyan);
}

.page-faq .qa-summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -2px;
}

.page-faq .qa-summary .signal {
  flex: 0 0 auto;
  margin-top: 9px;
}

.page-faq .qa-title {
  flex: 1 1 auto;
  min-width: 0;
}

.page-faq .qa-badge {
  flex: 0 0 auto;
  margin-top: 4px;
  padding: 2px 7px;
  border: 1px solid var(--faq-rule-strong);
  border-radius: var(--radius-s);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.06em;
  color: var(--frost);
  white-space: nowrap;
}

.page-faq .qa-badge--human {
  border-color: rgba(242, 163, 60, 0.46);
  color: var(--amber);
}

.page-faq .qa-toggle {
  position: relative;
  flex: 0 0 auto;
  width: 16px;
  height: 16px;
  margin-top: 6px;
}

.page-faq .qa-toggle::before,
.page-faq .qa-toggle::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  background: var(--frost);
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}

.page-faq .qa-toggle::before {
  width: 12px;
  height: 1.5px;
  transform: translate(-50%, -50%);
}

.page-faq .qa-toggle::after {
  width: 1.5px;
  height: 12px;
  transform: translate(-50%, -50%);
}

.page-faq .qa[open] .qa-toggle::after {
  opacity: 0;
}

.page-faq .qa[open] .qa-summary {
  border-bottom: 1px solid var(--faq-rule);
}

.page-faq .qa-body {
  padding: 14px;
  font-size: 15px;
  line-height: 1.9;
  color: var(--bright);
  animation: faq-unfold 220ms var(--ease);
}

@keyframes faq-unfold {
  from {
    opacity: 0;
    transform: translateY(-3px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.page-faq .qa-body p {
  margin: 0 0 10px;
  max-width: 66ch;
}

.page-faq .qa-body p:last-child {
  margin-bottom: 0;
}

.page-faq .qa-body a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(75, 224, 208, 0.38);
}

.page-faq .qa-body a:hover,
.page-faq .qa-body a:focus-visible {
  border-bottom-color: var(--cyan);
}

.page-faq .qa-steps {
  display: flex;
  flex-direction: column;
  gap: 9px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .qa-steps li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
}

.page-faq .step-i {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  margin-top: 4px;
  border-radius: var(--radius-s);
  background: var(--frost);
  color: var(--navy-900);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  line-height: 1;
}

/* ---------- 复制模板按钮 ---------- */
.page-faq .copy-template {
  display: inline-flex;
  align-items: center;
  margin: 14px 0 0;
  padding: 9px 17px;
  border: 1px solid var(--amber);
  border-radius: var(--radius-pill);
  background: var(--amber);
  color: var(--navy-900);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.02em;
  cursor: pointer;
  transition: background-color var(--dur) var(--ease), border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-faq .copy-template:hover,
.page-faq .copy-template:focus-visible {
  background: var(--amber-deep);
  border-color: var(--amber-deep);
}

.page-faq .copy-template[data-copied] {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--navy-900);
}

/* ---------- 图注 ---------- */
.page-faq .faq-figure {
  margin: 4px 0 0;
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border: 1px solid var(--faq-rule);
  border-radius: var(--radius-m);
  background: var(--navy-700);
}

.page-faq .faq-figure--tall {
  max-width: 340px;
}

.page-faq .faq-figure figcaption {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.7;
  color: var(--frost);
}

/* ---------- 桌面端 ---------- */
@media (min-width: 880px) {
  .page-faq {
    padding: 40px 32px 112px;
  }

  .page-faq .faq-lede {
    font-size: 17px;
  }

  .page-faq .faq-metrics {
    max-width: 520px;
  }

  .page-faq .faq-jump {
    flex-wrap: wrap;
    margin: 30px 0 0;
    padding: 0;
    overflow: visible;
  }

  .page-faq .faq-fork {
    display: grid;
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    align-items: center;
    gap: 24px;
    padding: 22px 24px;
  }

  .page-faq .fork-caption {
    margin: 0;
    font-size: 14px;
  }

  .page-faq .faq-group {
    margin-top: 56px;
  }

  .page-faq .group-title {
    font-size: 26px;
  }

  .page-faq .qa-list {
    gap: 12px;
  }

  .page-faq .qa-summary {
    padding: 15px 18px;
    font-size: 17px;
  }

  .page-faq .qa-body {
    padding: 16px 18px 18px;
    font-size: 16px;
  }

  .page-faq .faq-figure--tall {
    max-width: 380px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq *,
  .page-faq *::before,
  .page-faq *::after {
    animation-duration: 1ms !important;
    transition-duration: 1ms !important;
  }
}