.page-faq {
  --faq-gap: clamp(20px, 4vw, 44px);
  --faq-radius: 0;
}

.page-faq .breadcrumb {
  padding-top: clamp(16px, 4vw, 32px);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  padding: clamp(20px, 4vw, 40px) 0 clamp(30px, 6vw, 62px);
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-hero__inner {
  display: grid;
  gap: clamp(24px, 5vw, 52px);
  align-items: center;
}

.page-faq .faq-hero__title {
  margin: 14px 0 0;
  font-family: var(--f-display);
  font-weight: 700;
  font-size: clamp(1.85rem, 6vw, 3.3rem);
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: var(--white);
}

.page-faq .faq-hero__lede {
  margin: 18px 0 0;
  max-width: 46ch;
  font-size: 1rem;
  line-height: 1.75;
  color: var(--paper);
}

.page-faq .faq-hero__meta {
  margin: 18px 0 0;
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-faq .faq-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-faq .faq-hero__visual {
  margin: 0;
  padding: clamp(12px, 3vw, 22px);
  border: 1px solid var(--line);
  background: linear-gradient(160deg, var(--panel) 0%, var(--ink) 72%);
}

.page-faq .faq-viz {
  display: block;
  width: 100%;
  height: auto;
}

.page-faq .faq-viz__bg {
  fill: url(#faqVizFade);
}

.page-faq .faq-viz__grid line {
  stroke: var(--line);
  stroke-width: 1;
}

.page-faq .faq-viz__path {
  fill: none;
  stroke: var(--cyan);
  stroke-width: 2;
}

.page-faq .faq-viz__node {
  fill: var(--panel-deep);
  stroke: var(--cyan);
  stroke-width: 1.5;
}

.page-faq .faq-viz__node--amber {
  stroke: var(--amber);
}

.page-faq .faq-viz__no {
  fill: var(--cyan);
  font-family: var(--f-mono);
  font-size: 13px;
  font-weight: 700;
  text-anchor: middle;
  dominant-baseline: middle;
}

.page-faq .faq-viz__no--amber {
  fill: var(--amber);
}

.page-faq .faq-viz__label {
  fill: var(--paper);
  font-family: var(--f-body);
  font-size: 13px;
  text-anchor: middle;
}

.page-faq .faq-viz__note {
  fill: var(--cyan);
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
}

.page-faq .faq-viz__note--dim {
  fill: var(--muted);
}

.page-faq .faq-viz__delta {
  fill: var(--amber);
  font-family: var(--f-mono);
  font-size: 20px;
  font-weight: 700;
  text-anchor: end;
}

.page-faq .faq-viz__axis {
  stroke: var(--line);
  stroke-width: 1;
}

.page-faq .faq-viz__ticks line {
  stroke: var(--muted);
  stroke-width: 1;
}

.page-faq .faq-viz__marker {
  fill: var(--amber);
}

.page-faq .faq-viz__tick-labels text {
  fill: var(--muted);
  font-family: var(--f-mono);
  font-size: 11px;
  text-anchor: middle;
}

/* ---------- 数据带 ---------- */
.page-faq .faq-band {
  border-bottom: 1px solid var(--line);
  background: var(--panel-deep);
}

.page-faq .faq-band__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(16px, 3vw, 30px);
  padding: clamp(22px, 4vw, 34px) 0;
}

.page-faq .faq-band .stat {
  min-width: 0;
}

.page-faq .faq-band .stat__num {
  display: block;
  font-family: var(--f-mono);
  font-weight: 700;
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  line-height: 1;
  color: var(--white);
}

.page-faq .faq-band .stat__num--cyan {
  color: var(--cyan);
}

.page-faq .faq-band .stat__num--amber {
  color: var(--amber);
}

.page-faq .faq-band .stat__key {
  display: block;
  margin-top: 8px;
  font-size: 0.82rem;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 主体网格 ---------- */
.page-faq .faq-body {
  padding: clamp(30px, 6vw, 64px) 0 clamp(40px, 7vw, 82px);
}

.page-faq .faq-body__grid {
  display: grid;
  gap: var(--faq-gap);
}

/* 分类轨道 */
.page-faq .faq-rail {
  border-top: 2px solid var(--cyan);
  padding-top: 14px;
  min-width: 0;
}

.page-faq .faq-rail__list {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
}

.page-faq .faq-rail__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 0;
  border-bottom: 1px dashed var(--line);
  color: var(--paper);
  text-decoration: none;
  font-size: 0.92rem;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

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

.page-faq .faq-rail__no {
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.page-faq .faq-rail__text {
  min-width: 0;
}

.page-faq .faq-rail__count {
  margin-left: auto;
  font-family: var(--f-mono);
  font-size: 11px;
  color: var(--muted);
  white-space: nowrap;
}

.page-faq .faq-rail__note {
  margin: 16px 0 0;
  font-size: 0.8rem;
  line-height: 1.7;
  color: var(--muted);
}

/* 问答流 */
.page-faq .faq-stream {
  min-width: 0;
}

.page-faq .faq-block + .faq-block {
  margin-top: clamp(34px, 6vw, 62px);
}

.page-faq .section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-block__title {
  margin: 0;
  font-family: var(--f-display);
  font-size: clamp(1.15rem, 2.6vw, 1.55rem);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-faq .faq-block__no {
  margin-right: 10px;
  font-family: var(--f-mono);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  color: var(--amber);
}

.page-faq .faq-block__hint {
  margin: 0;
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--muted);
  white-space: nowrap;
}

/* 折叠问答 */
.page-faq .qa {
  border-bottom: 1px solid var(--line);
}

.page-faq .qa__q {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 16px 0;
  cursor: pointer;
  list-style: none;
  font-size: 1rem;
  line-height: 1.6;
  color: var(--paper);
  transition: color 0.18s var(--ease);
}

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

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

.page-faq .qa__mark {
  position: relative;
  flex: 0 0 auto;
  width: 14px;
  height: 14px;
  margin-top: 6px;
  border: 1px solid var(--muted);
  transition: border-color 0.18s var(--ease);
}

.page-faq .qa__mark::before,
.page-faq .qa__mark::after {
  content: "";
  position: absolute;
  background: var(--muted);
  transition: background 0.18s var(--ease);
}

.page-faq .qa__mark::before {
  left: 50%;
  top: 3px;
  bottom: 3px;
  width: 1px;
  transform: translateX(-50%);
}

.page-faq .qa__mark::after {
  top: 50%;
  left: 3px;
  right: 3px;
  height: 1px;
  transform: translateY(-50%);
}

.page-faq .qa[open] .qa__q {
  color: var(--white);
}

.page-faq .qa[open] .qa__mark {
  border-color: var(--cyan);
}

.page-faq .qa[open] .qa__mark::before {
  display: none;
}

.page-faq .qa[open] .qa__mark::after {
  background: var(--cyan);
}

.page-faq .qa__a {
  max-width: 68ch;
  padding: 0 0 18px 26px;
}

.page-faq .qa__a p {
  margin: 0 0 10px;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--paper);
}

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

.page-faq .qa__a a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  transition: border-color 0.18s var(--ease);
}

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

/* 步骤编号 */
.page-faq .faq-steps {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 12px 0 12px;
  padding: 0;
  list-style: none;
}

.page-faq .faq-step {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  background: var(--panel-deep);
  transition: border-color 0.18s var(--ease), background 0.18s var(--ease);
}

.page-faq .faq-step:hover {
  border-color: var(--cyan);
  background: var(--panel);
}

.page-faq .faq-step__no {
  font-family: var(--f-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--amber);
}

.page-faq .faq-step__label {
  font-size: 0.9rem;
  color: var(--paper);
}

/* 更新节奏表 */
.page-faq .faq-table__wrap {
  margin-top: 18px;
  border: 1px solid var(--line);
  overflow-x: auto;
}

.page-faq .faq-table {
  width: 100%;
  min-width: 520px;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.page-faq .faq-table caption {
  padding: 12px 14px;
  text-align: left;
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-faq .faq-table th,
.page-faq .faq-table td {
  padding: 11px 14px;
  text-align: left;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-table th {
  font-family: var(--f-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--cyan);
  background: var(--panel-deep);
  white-space: nowrap;
}

.page-faq .faq-table td {
  color: var(--paper);
  line-height: 1.6;
}

.page-faq .faq-table tbody tr:last-child td {
  border-bottom: 0;
}

/* 图组 */
.page-faq .faq-figure {
  margin: 20px 0 0;
}

.page-faq .faq-figure .media {
  border: 1px solid var(--line);
  overflow: hidden;
}

.page-faq .faq-figure .media img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
}

.page-faq .faq-figure .media__cap {
  margin-top: 10px;
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  line-height: 1.7;
  color: var(--muted);
}

/* 结尾引导 */
.page-faq .faq-cta {
  display: grid;
  gap: 18px;
  margin-top: clamp(38px, 6vw, 66px);
  padding: clamp(20px, 4vw, 32px);
  border: 1px solid var(--line);
  border-left: 3px solid var(--amber);
  background: var(--panel);
}

.page-faq .faq-cta__title {
  margin: 0;
  font-family: var(--f-display);
  font-size: clamp(1.1rem, 2.4vw, 1.35rem);
  font-weight: 700;
  color: var(--white);
}

.page-faq .faq-cta__text {
  margin: 10px 0 0;
  max-width: 62ch;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--paper);
}

.page-faq .faq-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-faq .faq-band__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-faq .qa__a {
    padding-left: 30px;
  }

  .page-faq .faq-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero__inner {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  }
}

@media (min-width: 1000px) {
  .page-faq .faq-body__grid {
    grid-template-columns: minmax(200px, 232px) minmax(0, 1fr);
    gap: clamp(32px, 5vw, 64px);
  }
}

@media (min-width: 1100px) {
  .page-faq .faq-rail {
    position: sticky;
    top: 36px;
    align-self: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa__q,
  .page-faq .qa__mark,
  .page-faq .qa__mark::before,
  .page-faq .qa__mark::after,
  .page-faq .faq-rail__link,
  .page-faq .faq-step {
    transition: none;
  }
}