.page-faq {
  --faq-radius: 22px;
  --faq-sticky-top: 104px;
  display: block;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  padding: clamp(22px, 4vw, 40px) 0 clamp(30px, 5vw, 58px);
}

.page-faq .faq-crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--muted);
  margin-bottom: clamp(18px, 3vw, 30px);
}

.page-faq .faq-crumb a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s ease, border-color .2s ease;
}

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

.page-faq .faq-crumb span[aria-current="page"] {
  color: var(--paper);
}

.page-faq .faq-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 48px);
  align-items: end;
}

.page-faq .faq-hero__text .label {
  display: block;
  margin: 0;
  color: var(--cyan);
}

.page-faq .faq-hero__text h1 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(32px, 5.4vw, 56px);
  line-height: 1.05;
  letter-spacing: -.02em;
  color: var(--paper);
}

.page-faq .faq-hero__text .lead {
  margin: 18px 0 0;
  max-width: 34rem;
  font-size: clamp(16px, 1.6vw, 17px);
  line-height: 1.85;
  color: var(--paper);
  opacity: .86;
}

.page-faq .faq-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.page-faq .faq-stat {
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: linear-gradient(160deg, rgba(20, 36, 58, .85), rgba(18, 22, 26, .6));
  transition: border-color .25s ease, transform .25s ease;
}

.page-faq .faq-stat:hover {
  border-color: var(--line-strong);
  transform: translateY(-3px);
}

.page-faq .faq-stat__value {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(22px, 2.6vw, 30px);
  line-height: 1.1;
  color: var(--cyan);
}

.page-faq .faq-stat:nth-child(2) .faq-stat__value {
  color: var(--gold);
}

.page-faq .faq-stat:nth-child(4) .faq-stat__value {
  color: var(--violet);
}

.page-faq .faq-stat__label {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: .04em;
  color: var(--muted);
}

.page-faq .faq-figure {
  margin: clamp(28px, 4vw, 48px) 0 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--ink-blue);
}

.page-faq .faq-figure .media__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 8 / 3;
  object-fit: cover;
}

/* ---------- 主体：索引 + 分组 ---------- */
.page-faq .faq-main {
  padding-bottom: clamp(40px, 6vw, 80px);
}

.page-faq .faq-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 3.5vw, 44px);
  align-items: start;
}

.page-faq .faq-index {
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: rgba(18, 22, 26, .62);
  min-width: 0;
}

.page-faq .faq-index__title {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--muted);
}

.page-faq .faq-index__list {
  list-style: none;
  margin: 0;
  padding: 0 0 4px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-faq .faq-index__list > li {
  flex: 0 0 auto;
}

.page-faq .faq-index__link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 16px;
  border: 1px solid var(--line);
  border-radius: var(--pill);
  color: var(--paper);
  text-decoration: none;
  font-size: 14px;
  line-height: 1.2;
  white-space: nowrap;
  transition: border-color .2s ease, color .2s ease, background-color .2s ease;
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  border-color: var(--line-strong);
  color: var(--cyan);
  background: rgba(53, 240, 200, .08);
}

.page-faq .faq-index__no {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  color: var(--gold);
}

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

/* ---------- 分组 ---------- */
.page-faq .faq-group {
  margin: 0 0 clamp(34px, 5vw, 62px);
  scroll-margin-top: 112px;
}

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

.page-faq .faq-group__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding-bottom: 14px;
  margin-bottom: clamp(16px, 2.4vw, 24px);
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-group__no {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(20px, 3vw, 30px);
  line-height: 1;
  color: var(--cyan);
}

.page-faq .faq-group__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(22px, 2.7vw, 28px);
  line-height: 1.2;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-faq .faq-group__intro {
  margin: 0 0 20px;
  max-width: 40rem;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

.page-faq .faq-inline-figure {
  margin: 0 0 22px;
  border: 1px solid var(--line);
  border-radius: var(--faq-radius);
  overflow: hidden;
  background: var(--ink-blue);
}

.page-faq .faq-inline-figure .media__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

/* ---------- 折叠问答 ---------- */
.page-faq .qa {
  position: relative;
  margin-bottom: 12px;
  border: 1px solid var(--line);
  border-radius: var(--faq-radius);
  background: rgba(18, 22, 26, .52);
  overflow: hidden;
  transition: border-color .28s ease, transform .28s ease, background-color .28s ease;
}

.page-faq .qa::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--cyan);
  transform: scaleY(0);
  transform-origin: top center;
  transition: transform .32s ease;
}

.page-faq .qa:hover {
  border-color: var(--line-strong);
  transform: translateY(-2px);
}

.page-faq .qa[open] {
  border-color: var(--line-strong);
  background: rgba(18, 22, 26, .78);
}

.page-faq .qa[open]::before {
  transform: scaleY(1);
}

.page-faq .qa__q {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 18px 20px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(16px, 1.7vw, 18px);
  line-height: 1.5;
  color: var(--paper);
}

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

.page-faq .qa__q::after {
  content: "+";
  margin-left: auto;
  padding-left: 12px;
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1;
  color: var(--gold);
}

.page-faq .qa[open] .qa__q::after {
  content: "−";
  color: var(--cyan);
}

.page-faq .qa__num {
  flex: 0 0 auto;
  padding-top: 5px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  color: var(--cyan);
  letter-spacing: .04em;
}

.page-faq .qa__a {
  padding: 0 20px 22px 52px;
}

.page-faq .qa__a p {
  margin: 0;
  max-width: 40rem;
  font-size: 16px;
  line-height: 1.9;
  color: var(--paper);
  opacity: .84;
}

/* ---------- 中段示意图 ---------- */
.page-faq .faq-viz {
  margin: clamp(30px, 4.5vw, 56px) 0;
  padding: clamp(18px, 2.6vw, 30px);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: linear-gradient(150deg, rgba(20, 36, 58, .88), rgba(11, 31, 26, .5));
}

.page-faq .faq-viz__cap {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--muted);
  text-transform: uppercase;
}

.page-faq .faq-viz__title {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(17px, 2.2vw, 22px);
  line-height: 1.35;
  letter-spacing: -.01em;
  color: var(--paper);
}

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

.page-faq .viz-axis,
.page-faq .viz-tick line {
  stroke: var(--line);
  stroke-width: 1;
}

.page-faq .viz-bar--home {
  fill: var(--cyan);
  opacity: .9;
}

.page-faq .viz-bar--away {
  fill: var(--violet);
  opacity: .85;
}

.page-faq .viz-label {
  fill: var(--muted);
  font-family: var(--font-body);
  font-size: 14px;
}

.page-faq .viz-label--end {
  text-anchor: end;
}

/* ---------- 响应式 ---------- */
@media (max-width: 620px) {
  .page-faq .faq-hero__stats {
    gap: 10px;
  }

  .page-faq .faq-stat {
    padding: 14px;
  }

  .page-faq .qa__q {
    padding: 16px;
    gap: 10px;
  }

  .page-faq .qa__a {
    padding: 0 16px 18px 16px;
  }

  .page-faq .qa__a p {
    line-height: 1.9;
  }

  .page-faq .faq-group__head {
    gap: 10px;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }
}

@media (min-width: 1000px) {
  .page-faq .faq-body {
    grid-template-columns: minmax(220px, 252px) minmax(0, 1fr);
    gap: clamp(36px, 4vw, 64px);
  }

  .page-faq .faq-index {
    position: sticky;
    top: var(--faq-sticky-top);
  }

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

  .page-faq .faq-index__list > li {
    flex: 1 1 auto;
  }

  .page-faq .faq-index__link {
    border-radius: var(--radius-sm);
    border-color: transparent;
    padding: 11px 14px;
  }

  .page-faq .faq-index__link:hover,
  .page-faq .faq-index__link:focus-visible {
    border-color: var(--line);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa,
  .page-faq .qa::before,
  .page-faq .faq-stat,
  .page-faq .faq-index__link {
    transition: none;
  }

  .page-faq .qa:hover,
  .page-faq .faq-stat:hover {
    transform: none;
  }
}