.page-faq {
  --faq-rail-w: 148px;
  --faq-pad: 1.25rem;
  padding-bottom: 3.5rem;
}

/* ---------- 页头 ---------- */
.page-faq .faq-head {
  position: relative;
  padding: 2rem 0 2.25rem;
  border-bottom: 1px solid var(--line-soft);
}

.page-faq .faq-head::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 72px;
  height: 2px;
  background: var(--cyan);
}

.page-faq .faq-head .page-lede {
  max-width: 62ch;
}

.page-faq .faq-head-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
  margin-top: 1.5rem;
  color: var(--text-dim);
}

.page-faq .faq-head-meta .trail {
  flex: 0 0 48px;
  height: 1px;
  background: var(--line-700);
}

/* ---------- 通用小件 ---------- */
.page-faq .faq-h2 {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 4.4vw, 2.2rem);
  line-height: 1.25;
  margin: 0 0 1rem;
  color: var(--star);
}

.page-faq .faq-p {
  color: var(--silver);
  max-width: 60ch;
  margin: 0 0 1.25rem;
}

.page-faq .faq-hint {
  color: var(--text-faint);
  margin: 1.5rem 0 0.5rem;
  letter-spacing: 0.14em;
}

/* ---------- 编号直达 ---------- */
.page-faq .faq-lookup {
  padding: 2.75rem 0;
  position: relative;
  overflow: hidden;
}

.page-faq .faq-lookup::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    radial-gradient(circle at 12% 22%, rgba(123, 92, 255, 0.22) 0, transparent 38%),
    radial-gradient(circle at 88% 78%, rgba(53, 214, 200, 0.14) 0, transparent 42%);
  opacity: 0.9;
}

.page-faq .faq-lookup-grid {
  position: relative;
  display: grid;
  gap: 2rem;
}

@media (min-width: 900px) {
  .page-faq .faq-lookup-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 400px);
    gap: 3.5rem;
    align-items: start;
  }
}

.page-faq .faq-code-field {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  max-width: 340px;
  padding: 0.6rem 0.95rem;
  background: var(--glass);
  border: 1px solid var(--line-700);
  border-radius: var(--radius-m);
  transition: border-color 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

.page-faq .faq-code-field:focus-within {
  border-color: var(--cyan);
  box-shadow: 0 0 0 3px rgba(53, 214, 200, 0.16);
}

.page-faq .faq-code-prefix {
  color: var(--cyan);
  font-size: 1rem;
  flex: 0 0 auto;
}

.page-faq .faq-code-input {
  flex: 1 1 auto;
  min-width: 0;
  padding: 0.35rem 0;
  background: transparent;
  border: 0;
  outline: none;
  color: var(--star);
  font-family: var(--font-mono);
  font-size: 1rem;
  letter-spacing: 0.14em;
}

.page-faq .faq-code-input::placeholder {
  color: var(--text-faint);
  letter-spacing: 0.14em;
}

.page-faq .faq-code-input::-webkit-search-cancel-button {
  filter: invert(80%);
}

.page-faq .faq-code-chips {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 0;
  padding: 0;
}

.page-faq .faq-code-chips .chip {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  text-decoration: none;
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease);
}

.page-faq .faq-code-chips .chip:hover,
.page-faq .faq-code-chips .chip:focus-visible {
  border-color: var(--cyan);
  color: var(--star);
}

.page-faq .faq-lookup-figure {
  margin: 0;
}

/* ---------- 高频问题带 ---------- */
.page-faq .faq-hot {
  padding: 2.75rem 0;
}

.page-faq .faq-hot-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}

.page-faq .faq-hot-item {
  background: var(--ink-900);
}

.page-faq .faq-hot-item a {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  padding: 0.9rem 0.75rem;
  text-decoration: none;
  color: var(--silver);
  transition: background 0.2s var(--ease), color 0.2s var(--ease);
}

.page-faq .faq-hot-item a:hover,
.page-faq .faq-hot-item a:focus-visible {
  background: var(--ink-800);
  color: var(--star);
}

.page-faq .faq-hot-code {
  flex: 0 0 auto;
  color: var(--cyan);
  font-size: 0.8rem;
  letter-spacing: 0.1em;
}

.page-faq .faq-hot-q {
  font-size: 1rem;
  line-height: 1.6;
  background-image: linear-gradient(transparent 62%, rgba(123, 92, 255, 0.18) 62%);
}

/* ---------- 五类问题折叠流 ---------- */
.page-faq .faq-stream {
  padding: 2.75rem 0 1rem;
}

.page-faq .faq-stream-figure {
  margin: 0 0 2rem;
}

.page-faq .faq-rail {
  display: grid;
  gap: 1.5rem;
}

@media (min-width: 1024px) {
  .page-faq .faq-rail {
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
    gap: 3rem;
  }
}

.page-faq .faq-rail-track {
  display: none;
}

@media (min-width: 1024px) {
  .page-faq .faq-rail-track {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
    position: sticky;
    top: calc(var(--header-h) + 1.75rem);
    align-self: start;
    padding-left: 1rem;
    border-left: 1px solid var(--line-soft);
  }
}

.page-faq .faq-rail-node {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  padding: 0.35rem 0;
  text-decoration: none;
  color: var(--text-dim);
  transition: color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-faq .faq-rail-node .mono {
  color: var(--nebula);
  font-size: 0.8rem;
}

.page-faq .faq-rail-name {
  font-size: 0.85rem;
}

.page-faq .faq-rail-node:hover,
.page-faq .faq-rail-node:focus-visible {
  color: var(--star);
  transform: translateX(3px);
}

.page-faq .faq-chapter {
  margin-bottom: 2.75rem;
  scroll-margin-top: calc(var(--header-h) + 1.5rem);
}

.page-faq .faq-chapter-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.75rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--line-700);
}

.page-faq .faq-chapter-code {
  font-size: 1.35rem;
  color: var(--nebula);
  letter-spacing: 0.1em;
}

.page-faq .faq-chapter-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.3rem;
  color: var(--star);
}

.page-faq .faq-chapter-note {
  flex: 1 1 100%;
  margin: 0.15rem 0 0;
  font-size: 0.88rem;
  color: var(--text-dim);
}

.page-faq .faq-items {
  display: grid;
  gap: 0.5rem;
  margin-top: 1rem;
}

.page-faq .faq-item {
  background: rgba(19, 26, 56, 0.72);
  border: 1px solid transparent;
  border-left: 2px solid var(--line-700);
  border-radius: var(--radius-s);
  transition: border-color 0.25s var(--ease), background 0.25s var(--ease);
}

.page-faq .faq-item[open] {
  background: var(--ink-800);
  border-left-color: var(--cyan);
}

.page-faq .faq-item-summary {
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
  padding: 0.85rem 0.95rem;
  cursor: pointer;
  list-style: none;
}

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

.page-faq .faq-item-summary::after {
  content: "+";
  margin-left: auto;
  flex: 0 0 auto;
  color: var(--text-faint);
  font-family: var(--font-mono);
  font-size: 1rem;
  transition: color 0.2s var(--ease);
}

.page-faq .faq-item[open] .faq-item-summary::after {
  content: "–";
  color: var(--cyan);
}

.page-faq .faq-item-summary:hover .faq-item-q,
.page-faq .faq-item-summary:focus-visible .faq-item-q {
  color: var(--star);
}

.page-faq .faq-item-code {
  flex: 0 0 auto;
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-faq .faq-item-q {
  font-size: 1rem;
  line-height: 1.6;
  color: var(--silver);
  transition: color 0.2s var(--ease);
}

.page-faq .faq-item-body {
  padding: 0 0.95rem 1rem;
  border-top: 1px solid var(--line-soft);
  margin-top: 0.15rem;
}

.page-faq .faq-item-body p {
  margin: 0.85rem 0 0;
  color: var(--silver);
  line-height: 1.8;
  font-size: 0.96rem;
}

.page-faq .faq-item-body a {
  color: var(--nebula);
  text-underline-offset: 4px;
}

.page-faq .faq-item[open] .faq-item-body {
  animation: faq-body-in 0.28s var(--ease) both;
}

@keyframes faq-body-in {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@media (min-width: 700px) {
  .page-faq .faq-item-body {
    padding: 0 1.25rem 1.15rem 4.6rem;
  }
  .page-faq .faq-item-summary {
    padding: 0.95rem 1.25rem;
  }
}

/* ---------- 新手卡点 ---------- */
.page-faq .faq-rookie {
  padding: 2.75rem 0 1rem;
}

.page-faq .faq-rookie-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-m);
  overflow: hidden;
}

@media (min-width: 780px) {
  .page-faq .faq-rookie-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-faq .faq-rookie-item {
  background: var(--ink-900);
  padding: 1.25rem 1.15rem 1.35rem;
}

.page-faq .faq-rookie-step {
  display: inline-block;
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  color: var(--gold);
}

.page-faq .faq-rookie-q {
  margin: 0.5rem 0 0.5rem;
  font-size: 1.05rem;
  color: var(--star);
  font-family: var(--font-display);
}

.page-faq .faq-rookie-item p {
  margin: 0;
  color: var(--text-dim);
  font-size: 0.94rem;
  line-height: 1.75;
}

/* ---------- 人工协助 ---------- */
.page-faq .faq-assist {
  padding: 2.75rem 0 0;
}

.page-faq .faq-assist-panel {
  border: 1px solid var(--line-700);
  border-radius: var(--radius-l);
  padding: 1.75rem 1.35rem;
  background:
    linear-gradient(158deg, rgba(123, 92, 255, 0.14) 0%, rgba(11, 16, 38, 0) 58%),
    var(--ink-800);
}

@media (min-width: 780px) {
  .page-faq .faq-assist-panel {
    padding: 2.25rem 2.25rem 2.35rem;
  }
}

.page-faq .faq-assist-panel h2 {
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 3.4vw, 1.9rem);
  color: var(--star);
  margin: 0 0 1.25rem;
}

.page-faq .faq-assist-list {
  list-style: none;
  margin: 0 0 1.25rem;
  padding: 0;
  display: grid;
  gap: 0.7rem;
}

.page-faq .faq-assist-list li {
  display: flex;
  gap: 0.75rem;
  align-items: baseline;
  color: var(--silver);
  line-height: 1.7;
  font-size: 0.96rem;
}

.page-faq .faq-assist-tag {
  flex: 0 0 auto;
  width: 1.5rem;
  height: 1.5rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line-700);
  border-radius: 50%;
  font-size: 0.72rem;
  color: var(--cyan);
}

.page-faq .faq-assist-note {
  margin: 0 0 1.5rem;
  color: var(--text-dim);
  font-size: 0.94rem;
  line-height: 1.8;
  max-width: 62ch;
}

.page-faq .faq-assist-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item[open] .faq-item-body {
    animation: none;
  }
  .page-faq .faq-rail-node:hover,
  .page-faq .faq-rail-node:focus-visible {
    transform: none;
  }
}