.page-faq {
  --faq-island: 860px;
  --faq-pad: clamp(16px, 3.2vw, 40px);
  padding-bottom: clamp(56px, 9vw, 140px);
}

/* 面包屑 */
.page-faq .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: clamp(84px, 11vw, 128px) 0 0;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  text-transform: uppercase;
}

.page-faq .breadcrumb a {
  color: var(--text-muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}

.page-faq .breadcrumb a:hover,
.page-faq .breadcrumb a:focus-visible {
  color: var(--lime-signal);
  border-bottom-color: var(--lime-signal);
}

.page-faq .breadcrumb__sep {
  color: var(--grid-hairline);
}

/* 首屏 */
.page-faq .faq-hero {
  max-width: var(--faq-island);
  padding: clamp(26px, 3.6vw, 48px) 0 0;
}

.page-faq .faq-kicker {
  margin: 0;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--amber-score);
}

.page-faq .faq-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(32px, 6vw, 62px);
  line-height: 1.02;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  overflow-wrap: anywhere;
}

.page-faq .faq-hero__lede {
  max-width: 38em;
  margin: 20px 0 0;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.78;
  color: var(--text-muted);
}

.page-faq .faq-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
  align-items: center;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

.page-faq .faq-hero__figure {
  max-width: var(--faq-island);
  margin: clamp(26px, 3.6vw, 44px) 0 0;
}

.page-faq .media-frame img {
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

/* 分组导航 */
.page-faq .faq-nav {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  max-width: var(--faq-island);
  margin: clamp(30px, 4vw, 52px) 0 0;
  border: 1px solid var(--grid-hairline);
  background: var(--grid-hairline);
}

.page-faq .faq-nav__item {
  display: flex;
  align-items: baseline;
  gap: 10px;
  min-width: 0;
  padding: 14px 16px;
  background: var(--moss-panel);
  color: var(--text-primary);
  text-decoration: none;
  transition: background 170ms var(--ease), color 170ms var(--ease);
}

.page-faq .faq-nav__num {
  flex: 0 0 auto;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--amber-score);
}

.page-faq .faq-nav__label {
  min-width: 0;
  font-size: 14px;
  font-weight: 600;
  line-height: 1.4;
}

.page-faq .faq-nav__item:hover,
.page-faq .faq-nav__item:focus-visible {
  background: var(--carbon-black);
  color: var(--lime-signal);
}

.page-faq .faq-nav__item:focus-visible {
  outline: 2px solid var(--lime-signal);
  outline-offset: -2px;
}

/* 分组 */
.page-faq .faq-group {
  max-width: var(--faq-island);
  margin: clamp(52px, 7vw, 96px) 0 0;
  scroll-margin-top: calc(var(--header-h) + 20px);
}

.page-faq .faq-group__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px 18px;
  align-items: start;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--grid-hairline);
}

.page-faq .faq-group__index {
  font-family: var(--font-data);
  font-size: clamp(26px, 4vw, 42px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--lime-signal);
  font-variant-numeric: tabular-nums;
  padding-top: 4px;
}

.page-faq .faq-group__kicker {
  margin: 0;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.page-faq .faq-group__title {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(22px, 3.2vw, 34px);
  line-height: 1.15;
  letter-spacing: -0.015em;
  color: var(--text-primary);
}

.page-faq .faq-group__figure {
  margin: 22px 0 0;
}

/* 条目 */
.page-faq .faq-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-item {
  border-bottom: 1px solid var(--grid-hairline);
}

.page-faq .faq-item summary {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 16px;
  align-items: start;
  padding: 20px 2px;
  cursor: pointer;
  list-style: none;
  font-size: clamp(15px, 1.7vw, 17px);
  font-weight: 600;
  line-height: 1.55;
  color: var(--text-primary);
  transition: color 160ms var(--ease);
}

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

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

.page-faq .faq-item summary:focus-visible {
  outline: 2px solid var(--lime-signal);
  outline-offset: 2px;
}

.page-faq .faq-item__q {
  min-width: 0;
  overflow-wrap: anywhere;
}

.page-faq .faq-item__icon {
  position: relative;
  flex: 0 0 auto;
  width: 22px;
  height: 22px;
  margin-top: 3px;
  border: 1px solid var(--grid-hairline);
  border-radius: var(--radius);
  transition: border-color 160ms var(--ease), background 170ms var(--ease);
}

.page-faq .faq-item__icon::before,
.page-faq .faq-item__icon::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  background: var(--text-muted);
  transition: transform 200ms var(--ease), background 160ms var(--ease);
}

.page-faq .faq-item__icon::before {
  width: 10px;
  height: 1.5px;
  transform: translate(-50%, -50%);
}

.page-faq .faq-item__icon::after {
  width: 1.5px;
  height: 10px;
  transform: translate(-50%, -50%);
}

.page-faq .faq-item[open] .faq-item__icon {
  border-color: var(--lime-signal);
  background: rgba(200, 255, 77, 0.1);
}

.page-faq .faq-item[open] .faq-item__icon::before {
  background: var(--lime-signal);
}

.page-faq .faq-item[open] .faq-item__icon::after {
  transform: translate(-50%, -50%) rotate(90deg) scale(0);
}

.page-faq .faq-item__a {
  max-width: 40em;
  padding: 0 2px 22px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--text-muted);
}

.page-faq .faq-item__a p {
  margin: 0;
}

.page-faq .faq-item__a p + p {
  margin-top: 10px;
}

/* 答案内链接芯片 */
.page-faq .faq-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 16px;
  padding: 7px 13px;
  border: 1px solid var(--lime-signal);
  border-radius: var(--radius);
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--lime-signal);
  text-decoration: none;
  transition: background 160ms var(--ease), color 160ms var(--ease);
}

.page-faq .faq-chip::after {
  content: "→";
  font-size: 13px;
}

.page-faq .faq-chip:hover,
.page-faq .faq-chip:focus-visible {
  background: var(--lime-signal);
  color: var(--void-green);
}

.page-faq .faq-chip:focus-visible {
  outline: 2px solid var(--lime-soft);
  outline-offset: 2px;
}

/* 尾注 */
.page-faq .faq-foot-note {
  max-width: 40em;
  margin: clamp(40px, 5vw, 64px) 0 0;
  padding-top: 20px;
  border-top: 1px solid var(--grid-hairline);
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-muted);
}

/* 浮动锚点 */
.page-faq .faq-back {
  position: fixed;
  right: clamp(14px, 3vw, 28px);
  bottom: clamp(16px, 4vw, 32px);
  z-index: 20;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 10px 14px;
  border: 1px solid var(--grid-hairline);
  border-radius: var(--radius);
  background: var(--carbon-black);
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  text-decoration: none;
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}

.page-faq .faq-back:hover,
.page-faq .faq-back:focus-visible {
  color: var(--lime-signal);
  border-color: var(--lime-signal);
}

.page-faq .faq-back:focus-visible {
  outline: 2px solid var(--lime-signal);
  outline-offset: 2px;
}

/* 中等屏 */
@media (min-width: 720px) {
  .page-faq .faq-nav {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* 窄屏收敛 */
@media (max-width: 560px) {
  .page-faq .faq-hero h1 {
    font-size: 30px;
    line-height: 1.1;
  }

  .page-faq .faq-group__head {
    grid-template-columns: auto minmax(0, 1fr);
    gap: 10px 12px;
  }

  .page-faq .faq-group__index {
    font-size: 24px;
    padding-top: 2px;
  }

  .page-faq .faq-item summary {
    padding: 17px 0;
    gap: 12px;
  }

  .page-faq .faq-item__icon {
    width: 20px;
    height: 20px;
  }

  .page-faq .faq-back {
    font-size: 11px;
    padding: 9px 12px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item__icon,
  .page-faq .faq-item__icon::before,
  .page-faq .faq-item__icon::after,
  .page-faq .faq-nav__item,
  .page-faq .faq-chip,
  .page-faq .breadcrumb a {
    transition: none;
  }
}