.page-faq {
  --faq-paper-ink: #33465f;
  --faq-paper-orange: #c0561b;
  --faq-gap: 14px;
  position: relative;
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  padding: clamp(96px, 13vw, 140px) 0 32px;
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 72px 72px;
  border-bottom: 1px solid var(--hairline);
}

.page-faq .faq-hero .breadcrumb {
  margin-bottom: 26px;
  font-size: 13px;
  letter-spacing: 0.02em;
}

.page-faq .faq-hero-grid {
  display: grid;
  gap: 30px;
  align-items: center;
}

.page-faq .faq-hero-copy .label {
  display: block;
  margin: 0 0 14px;
}

.page-faq .faq-hero h1 {
  margin: 0 0 18px;
  font-family: var(--font-head);
  font-weight: 900;
  letter-spacing: -0.02em;
  font-size: clamp(30px, 6.4vw, 58px);
  line-height: 1.08;
  color: var(--c-white);
  max-width: 18ch;
}

.page-faq .faq-lede {
  margin: 0 0 26px;
  max-width: 46ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--c-steel);
}

.page-faq .faq-quick {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-faq .faq-quick .btn {
  font-size: 14px;
  padding: 10px 18px;
}

/* 首屏图片 */
.page-faq .faq-figure {
  margin: 0;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: linear-gradient(160deg, var(--c-ink), var(--c-night));
  box-shadow: var(--shadow-deep);
}

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

.page-faq .faq-figure--hero img {
  aspect-ratio: 2 / 1;
}

/* 指标条 */
.page-faq .faq-strip {
  list-style: none;
  margin: 34px 0 0;
  padding: 1px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--hairline);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.page-faq .faq-strip li {
  background: var(--c-space);
  padding: 16px 18px;
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.page-faq .faq-strip-num {
  font-family: var(--font-data);
  font-size: 26px;
  line-height: 1;
  color: var(--c-cyan);
}

.page-faq .faq-strip-key {
  font-size: 13.5px;
  line-height: 1.5;
  color: var(--c-steel);
}

/* ---------- 主体两栏 ---------- */
.page-faq .faq-body {
  padding: 44px 0 80px;
}

.page-faq .faq-layout {
  display: grid;
  gap: 34px;
  align-items: start;
}

/* 场景索引 */
.page-faq .faq-side .label {
  display: block;
  margin: 0 0 12px;
}

.page-faq .faq-index {
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-faq .faq-index a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 15px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--hairline);
  color: var(--c-steel);
  text-decoration: none;
  font-size: 14px;
  white-space: nowrap;
  transition: color 0.24s var(--ease), border-color 0.24s var(--ease), background-color 0.24s var(--ease);
}

.page-faq .faq-index a:hover,
.page-faq .faq-index a:focus-visible {
  color: var(--c-cyan);
  border-color: rgba(53, 230, 208, 0.55);
  background: rgba(53, 230, 208, 0.08);
}

.page-faq .faq-index-num {
  font-family: var(--font-data);
  font-size: 11.5px;
  color: var(--c-orange);
  letter-spacing: 0.06em;
}

.page-faq .faq-side-note {
  margin-top: 22px;
  padding: 18px;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-md);
  background: var(--c-ink);
}

.page-faq .faq-side-note p {
  margin: 0 0 14px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--c-steel);
}

.page-faq .faq-side-note .btn {
  font-size: 13.5px;
  padding: 9px 16px;
}

/* ---------- 问答区块 ---------- */
.page-faq .faq-block {
  padding-top: 26px;
  margin-bottom: 54px;
  border-top: 1px solid var(--hairline-strong);
  scroll-margin-top: 110px;
}

.page-faq .faq-panels > .faq-block:last-child {
  margin-bottom: 0;
}

.page-faq .faq-block-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
}

.page-faq .faq-num {
  font-family: var(--font-data);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--c-orange);
}

.page-faq .faq-block-head h2 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  letter-spacing: -0.01em;
  font-size: clamp(21px, 3.6vw, 32px);
  line-height: 1.25;
  color: var(--c-white);
}

.page-faq .faq-block-lede {
  margin: 12px 0 22px;
  max-width: 58ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--c-steel);
}

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

.page-faq .faq-item {
  border: 1px solid var(--hairline);
  border-radius: var(--radius-md);
  background: var(--c-ink);
  overflow: hidden;
  transition: border-color 0.26s var(--ease);
}

.page-faq .faq-item[open] {
  border-color: rgba(53, 230, 208, 0.42);
}

.page-faq .faq-item summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 18px;
  font-size: 15.5px;
  font-weight: 600;
  line-height: 1.6;
  color: var(--c-white);
}

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

.page-faq .faq-item summary::after {
  content: "+";
  flex: none;
  font-family: var(--font-data);
  font-size: 19px;
  line-height: 1;
  color: var(--c-cyan);
  transition: transform 0.26s var(--ease);
}

.page-faq .faq-item[open] summary::after {
  content: "–";
  transform: rotate(180deg);
}

.page-faq .faq-answer {
  padding: 0 18px 18px;
}

.page-faq .faq-answer p {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.9;
  color: var(--c-steel);
}

.page-faq .faq-answer a {
  color: var(--c-cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* 同步示意 */
.page-faq .faq-sync {
  margin: 0 0 22px;
}

.page-faq .faq-syncbar {
  height: 4px;
  border-radius: var(--radius-pill);
  background: linear-gradient(90deg, var(--c-violet), var(--c-magenta), var(--c-violet));
  background-size: 200% 100%;
  animation: faq-sync-flow 2.4s linear infinite;
}

@keyframes faq-sync-flow {
  from { background-position: 0 0; }
  to { background-position: -200% 0; }
}

.page-faq .faq-sync-caption {
  margin: 10px 0 0;
  font-family: var(--font-data);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--c-steel);
}

.page-faq .faq-figure--flow {
  margin-bottom: 24px;
  box-shadow: none;
}

/* 纸色反馈章节 */
.page-faq .faq-block--paper {
  border: 2px solid var(--c-line);
  border-radius: var(--radius-lg);
  padding: 26px 20px;
  background: var(--c-paper);
  box-shadow: var(--shadow-lift);
}

.page-faq .faq-block--paper .faq-block-head h2 {
  color: var(--c-ink);
}

.page-faq .faq-block--paper .faq-num {
  color: var(--faq-paper-orange);
}

.page-faq .faq-block--paper .faq-block-lede {
  color: var(--faq-paper-ink);
}

.page-faq .faq-block--paper .faq-item {
  background: rgba(255, 255, 255, 0.68);
  border-color: var(--c-line);
}

.page-faq .faq-block--paper .faq-item[open] {
  border-color: var(--c-orange);
}

.page-faq .faq-block--paper .faq-item summary {
  color: var(--c-ink);
}

.page-faq .faq-block--paper .faq-item summary::after {
  color: var(--faq-paper-orange);
}

.page-faq .faq-block--paper .faq-answer p {
  color: var(--faq-paper-ink);
}

.page-faq .faq-block--paper .faq-answer a {
  color: var(--c-ink);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-faq .faq-strip {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 960px) {
  .page-faq .faq-hero {
    padding-bottom: 44px;
  }

  .page-faq .faq-hero-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 48px;
  }

  .page-faq .faq-layout {
    grid-template-columns: 250px minmax(0, 1fr);
    gap: 56px;
  }

  .page-faq .faq-side {
    position: sticky;
    top: 104px;
  }

  .page-faq .faq-index {
    flex-direction: column;
    overflow-x: visible;
    padding-bottom: 0;
  }

  .page-faq .faq-index a {
    white-space: normal;
    width: 100%;
  }

  .page-faq .faq-block--paper {
    padding: 34px 32px;
  }

  .page-faq .faq-item summary {
    padding: 17px 22px;
  }

  .page-faq .faq-answer {
    padding: 0 22px 20px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-syncbar {
    animation: none;
    background: linear-gradient(90deg, var(--c-violet), var(--c-magenta));
  }

  .page-faq .faq-index a,
  .page-faq .faq-item,
  .page-faq .faq-item summary::after {
    transition: none;
  }
}