.page-faq {
  --faq-line: rgba(11, 43, 36, .12);
  --faq-ink: #2F4A42;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(1.25rem, 3vw, 2rem) clamp(2.5rem, 6vw, 4.5rem);
  background:
    radial-gradient(120% 90% at 88% 4%, rgba(47, 209, 255, .16), transparent 58%),
    radial-gradient(90% 80% at 6% 96%, rgba(255, 106, 19, .16), transparent 62%),
    linear-gradient(168deg, var(--ink-900) 0%, var(--ink-950) 78%);
  color: var(--white);
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  right: -8%;
  top: 12%;
  width: min(420px, 46vw);
  aspect-ratio: 1 / 1;
  border: 1px dashed rgba(232, 243, 238, .16);
  border-radius: 50%;
  pointer-events: none;
}

.page-faq .faq-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.75rem, 4vw, 3rem);
  margin-top: clamp(1.5rem, 3vw, 2.5rem);
}

.page-faq .faq-hero__kicker {
  display: inline-block;
  margin: 0 0 1rem;
  padding: .35rem .8rem;
  font-family: var(--font-mono);
  font-size: .8125rem;
  letter-spacing: .08em;
  color: var(--ink-950);
  background: var(--amber);
  border-radius: 999px;
}

.page-faq .faq-hero__title {
  margin: 0 0 1.125rem;
  max-width: 18ch;
  font-family: var(--font-display);
  font-size: clamp(2.1rem, 5.4vw, 4rem);
  font-weight: 900;
  letter-spacing: -.02em;
  line-height: 1.08;
  color: var(--white);
}

.page-faq .faq-hero__lede {
  margin: 0 0 1.75rem;
  max-width: 34ch;
  font-size: 1.0625rem;
  line-height: 1.78;
  color: var(--ink-text);
}

.page-faq .faq-hero__acts {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
}

.page-faq .faq-hero__stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: .75rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-hero__stat {
  display: flex;
  flex-direction: column;
  gap: .35rem;
  padding: 1rem .875rem;
  background: rgba(18, 62, 51, .72);
  border: 1px solid var(--line);
  border-radius: var(--r-organic);
}

.page-faq .faq-hero__statnum {
  font-family: var(--font-mono);
  font-size: clamp(1.25rem, 2.6vw, 1.75rem);
  font-weight: 700;
  color: var(--orange);
  letter-spacing: -.02em;
}

.page-faq .faq-hero__statlab {
  font-size: .8125rem;
  line-height: 1.5;
  color: var(--muted);
}

.page-faq .faq-hero__media {
  margin: clamp(2rem, 5vw, 3.25rem) 0 0;
}

/* ---------- 主体 ---------- */
.page-faq .faq-body {
  padding-block: clamp(2.5rem, 6vw, 4.5rem);
}

.page-faq .faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(2rem, 4vw, 3rem);
  align-items: start;
}

.page-faq .faq-stack {
  display: grid;
  gap: clamp(2.25rem, 5vw, 3.5rem);
  min-width: 0;
}

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

.page-faq .faq-group__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  column-gap: .875rem;
  row-gap: .5rem;
  padding-bottom: 1.125rem;
  margin-bottom: 1.25rem;
  border-bottom: 1px solid var(--faq-line);
}

.page-faq .faq-group__no {
  grid-row: span 2;
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1;
  color: var(--orange);
}

.page-faq .faq-group__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.25rem, 2.4vw, 1.75rem);
  font-weight: 800;
  letter-spacing: -.01em;
  line-height: 1.28;
  color: var(--ink-900);
}

.page-faq .faq-group__note {
  grid-column: 2;
  margin: 0;
  font-size: .9375rem;
  line-height: 1.7;
  color: var(--faq-ink);
}

.page-faq .faq-group__figure {
  margin: 0 0 1.25rem;
  max-width: 420px;
}

/* ---------- 折叠面板 ---------- */
.page-faq .faq-item {
  margin-bottom: .625rem;
  background: var(--white);
  border: 1px solid var(--faq-line);
  border-radius: var(--r-soft);
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

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

.page-faq .faq-item[open] {
  border-color: rgba(255, 106, 19, .5);
  box-shadow: var(--shadow-card);
}

.page-faq .faq-item > summary {
  display: flex;
  align-items: baseline;
  gap: .75rem;
  padding: 1.0625rem 3rem 1.0625rem 1.125rem;
  position: relative;
  cursor: pointer;
  list-style: none;
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.55;
  color: var(--ink-900);
  border-radius: var(--r-soft);
  transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

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

.page-faq .faq-item > summary::after {
  content: "";
  position: absolute;
  right: 1.25rem;
  top: 50%;
  width: 9px;
  height: 9px;
  border-right: 2px solid var(--orange);
  border-bottom: 2px solid var(--orange);
  transform: translateY(-72%) rotate(45deg);
  transition: transform var(--dur) var(--ease);
}

.page-faq .faq-item[open] > summary::after {
  transform: translateY(-24%) rotate(-135deg);
}

.page-faq .faq-item > summary:hover {
  background: rgba(232, 243, 238, .6);
}

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

.page-faq .faq-item__no {
  flex: none;
  font-family: var(--font-mono);
  font-size: .8125rem;
  font-weight: 600;
  letter-spacing: .04em;
  color: var(--orange);
}

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

.page-faq .faq-item__body {
  padding: 0 1.125rem 1.25rem 3rem;
}

.page-faq .faq-item__body p {
  margin: 0;
  max-width: 40ch;
  font-size: .9375rem;
  line-height: 1.78;
  color: var(--faq-ink);
}

/* ---------- 右侧主题导航 ---------- */
.page-faq .faq-rail {
  min-width: 0;
  padding: 1.25rem;
  background: var(--ink-900);
  border-radius: var(--r-organic);
  color: var(--ink-text);
}

.page-faq .faq-rail__label {
  margin: 0 0 .875rem;
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-faq .faq-rail__list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-left: 1px solid var(--line-strong);
}

.page-faq .faq-rail__item {
  position: relative;
}

.page-faq .faq-rail__link {
  display: flex;
  align-items: baseline;
  gap: .5rem;
  padding: .625rem 0 .625rem .875rem;
  font-size: .9375rem;
  line-height: 1.5;
  color: var(--ink-text);
  text-decoration: none;
  border-radius: 0 var(--r-soft) var(--r-soft) 0;
  transition: color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-faq .faq-rail__link::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 50%;
  width: 7px;
  height: 7px;
  margin-top: -3.5px;
  border-radius: 50%;
  background: var(--line-strong);
  transition: background-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-faq .faq-rail__item[data-current] .faq-rail__link::before {
  background: var(--orange);
  transform: scale(1.35);
}

.page-faq .faq-rail__item[data-current] .faq-rail__link {
  color: var(--white);
  font-weight: 600;
}

.page-faq .faq-rail__link:hover {
  color: var(--white);
  background: rgba(255, 106, 19, .12);
}

.page-faq .faq-rail__link:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 2px;
}

.page-faq .faq-rail__no {
  font-family: var(--font-mono);
  font-size: .75rem;
  color: var(--blue);
}

.page-faq .faq-rail__foot {
  margin-top: 1.25rem;
  padding-top: 1.125rem;
  border-top: 1px solid var(--line);
}

.page-faq .faq-rail__hint {
  margin: 0 0 .875rem;
  font-size: .875rem;
  line-height: 1.65;
  color: var(--muted);
}

/* ---------- 收尾 ---------- */
.page-faq .faq-tail {
  padding-block: clamp(2.5rem, 6vw, 4rem);
}

.page-faq .faq-tail__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.75rem, 4vw, 3rem);
  align-items: start;
}

.page-faq .faq-tail__title {
  margin: .75rem 0 .875rem;
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3.2vw, 2.25rem);
  font-weight: 800;
  letter-spacing: -.015em;
  line-height: 1.2;
  color: var(--white);
}

.page-faq .faq-tail__lede {
  margin: 0;
  max-width: 46ch;
  font-size: 1rem;
  line-height: 1.78;
  color: var(--ink-text);
}

.page-faq .faq-tail__links {
  display: grid;
  gap: .5rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-tail__link {
  display: flex;
  align-items: center;
  gap: .75rem;
  padding: .9375rem 1.125rem;
  font-size: .9375rem;
  font-weight: 600;
  color: var(--white);
  text-decoration: none;
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-radius: var(--r-organic);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-faq .faq-tail__link:hover {
  transform: translateY(-2px);
  border-color: var(--orange);
}

.page-faq .faq-tail__link:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 2px;
}

.page-faq .faq-tail__num {
  font-family: var(--font-mono);
  font-size: .8125rem;
  color: var(--orange);
}

/* ---------- 响应式 ---------- */
@media (max-width: 719px) {
  .page-faq .faq-hero__stats {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-faq .faq-hero__stat {
    flex-direction: row;
    align-items: baseline;
    justify-content: space-between;
    gap: .75rem;
  }

  .page-faq .faq-item__body {
    padding-left: 1.125rem;
  }

  .page-faq .faq-group__head {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-faq .faq-group__no {
    grid-row: auto;
  }

  .page-faq .faq-group__note {
    grid-column: 1;
  }
}

@media (min-width: 960px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 3fr);
    align-items: end;
  }

  .page-faq .faq-hero__stats {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-faq .faq-layout {
    grid-template-columns: minmax(0, 8fr) minmax(0, 3fr);
    gap: clamp(2.5rem, 4.5vw, 4.5rem);
  }

  .page-faq .faq-rail {
    position: sticky;
    top: 5.5rem;
    padding: 1.5rem 1.375rem;
  }

  .page-faq .faq-tail__inner {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
  }
}

@media (min-width: 1200px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 4fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item,
  .page-faq .faq-item > summary,
  .page-faq .faq-item > summary::after,
  .page-faq .faq-rail__link,
  .page-faq .faq-rail__link::before,
  .page-faq .faq-tail__link {
    transition: none;
  }

  .page-faq .faq-tail__link:hover {
    transform: none;
  }
}