.page-faq {
  --faq-index-w: 296px;
  --faq-scroll-offset: calc(var(--header-h, 76px) + 28px);
  background: var(--ink);
  color: var(--mist);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(32px, 6vw, 78px) 0 clamp(26px, 4vw, 50px);
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: -30% -15% auto -15%;
  height: 170%;
  background:
    radial-gradient(52% 60% at 84% 14%, rgba(184, 255, 60, 0.14), transparent 62%),
    radial-gradient(46% 56% at 6% 86%, rgba(53, 208, 192, 0.11), transparent 68%);
  pointer-events: none;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px);
  background-size: 100% 76px;
  pointer-events: none;
}

.page-faq .faq-hero .shell {
  position: relative;
  z-index: 1;
}

.page-faq .faq-hero__title {
  font-family: var(--font-display);
  font-size: clamp(46px, 10vw, 112px);
  font-weight: 700;
  line-height: 0.9;
  letter-spacing: -0.015em;
  margin: 12px 0 0;
  color: var(--mist);
}

.page-faq .faq-hero__lead {
  margin: 20px 0 0;
  max-width: 62ch;
  font-size: clamp(15.5px, 1.6vw, 18px);
  line-height: 1.78;
  color: var(--gray);
}

.page-faq .faq-hero__stats {
  list-style: none;
  margin: clamp(26px, 3.6vw, 42px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-faq .faq-stat {
  background: var(--charcoal);
  padding: 16px 18px 18px;
}

.page-faq .faq-stat__num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.4vw, 40px);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--lime);
}

.page-faq .faq-stat__unit {
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--gray);
  margin-left: 6px;
}

.page-faq .faq-stat__label {
  margin: 9px 0 0;
  font-size: 13px;
  line-height: 1.5;
  letter-spacing: 0.02em;
  color: var(--gray);
}

/* ---------- 主布局 ---------- */
.page-faq .faq-shell {
  padding: clamp(30px, 4.5vw, 62px) 0 clamp(56px, 8vw, 104px);
}

.page-faq .faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3.5vw, 46px);
}

/* ---------- 左侧索引 ---------- */
.page-faq .faq-index {
  background: var(--charcoal);
  border: 1px solid var(--line);
  padding: 18px 16px;
}

.page-faq .faq-index__title {
  margin: 0 0 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--lime);
}

.page-faq .faq-index__group + .faq-index__group {
  margin-top: 16px;
}

.page-faq .faq-index__group-title {
  margin: 0 0 6px;
  padding-left: 12px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--gray);
  opacity: 0.72;
}

.page-faq .faq-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-faq .faq-index__link {
  display: flex;
  gap: 9px;
  align-items: baseline;
  padding: 6px 8px 6px 11px;
  border-left: 2px solid var(--line);
  color: var(--gray);
  text-decoration: none;
  font-size: 13.5px;
  line-height: 1.5;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease), background-color 0.18s var(--ease);
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  color: var(--mist);
  border-left-color: var(--lime);
  background: var(--glass);
  outline: none;
}

.page-faq .faq-index__num {
  flex: 0 0 auto;
  padding-top: 2px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.04em;
  color: var(--lime);
}

/* ---------- 右侧答案流 ---------- */
.page-faq .faq-stream {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.page-faq .faq-group {
  padding-bottom: clamp(28px, 4vw, 52px);
  margin-bottom: clamp(28px, 4vw, 52px);
  border-bottom: 1px solid var(--line);
  scroll-margin-top: var(--faq-scroll-offset);
}

.page-faq .faq-group:last-child {
  padding-bottom: 0;
  margin-bottom: 0;
  border-bottom: none;
}

.page-faq .faq-group__head {
  margin-bottom: clamp(16px, 2.4vw, 26px);
}

.page-faq .faq-group__kicker {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 9px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--lime);
}

.page-faq .faq-group__kicker::before {
  content: "";
  display: block;
  width: 24px;
  height: 2px;
  background: var(--lime);
}

.page-faq .faq-group__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(26px, 3.4vw, 40px);
  font-weight: 700;
  line-height: 1.12;
  letter-spacing: -0.01em;
  color: var(--mist);
}

.page-faq .faq-group__lead {
  margin: 10px 0 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.72;
  color: var(--gray);
}

/* ---------- 问答条目 ---------- */
.page-faq .faq-item {
  position: relative;
  padding: 20px 0 18px;
  border-top: 1px solid var(--line);
  scroll-margin-top: var(--faq-scroll-offset);
}

.page-faq .faq-item::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(184, 255, 60, 0.09), rgba(184, 255, 60, 0) 72%);
  opacity: 0;
  transition: opacity 0.3s var(--ease);
  pointer-events: none;
}

.page-faq .faq-item:target::before {
  opacity: 1;
}

.page-faq .faq-item__q {
  position: relative;
  display: flex;
  gap: 12px;
  align-items: baseline;
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(18px, 2.1vw, 23px);
  font-weight: 600;
  line-height: 1.42;
  letter-spacing: 0.005em;
  color: var(--mist);
  transition: color 0.25s var(--ease);
}

.page-faq .faq-item__num {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.06em;
  color: var(--gray);
  transition: color 0.25s var(--ease);
}

.page-faq .faq-item:hover .faq-item__num,
.page-faq .faq-item:target .faq-item__num,
.page-faq .faq-item:target .faq-item__q {
  color: var(--lime);
}

.page-faq .faq-item__a {
  position: relative;
  margin: 12px 0 0 24px;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--gray);
}

.page-faq .faq-item__a p {
  margin: 0 0 10px;
}

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

.page-faq .faq-item__a strong {
  color: var(--mist);
  font-weight: 600;
  font-family: var(--font-mono);
  letter-spacing: -0.01em;
}

.page-faq .faq-item__a a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid var(--lime);
  padding-bottom: 1px;
  transition: color 0.18s var(--ease), background-color 0.18s var(--ease);
}

.page-faq .faq-item__a a:hover,
.page-faq .faq-item__a a:focus-visible {
  color: var(--ink);
  background: var(--lime);
  outline: none;
}

/* ---------- 插图 ---------- */
.page-faq .faq-figure {
  margin: clamp(20px, 3vw, 30px) 0 0;
  border: 1px solid var(--line);
  background: var(--graphite);
  overflow: hidden;
}

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

.page-faq .faq-figure__caption {
  padding: 12px 16px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  line-height: 1.65;
  color: var(--gray);
}

/* ---------- 联系卡 ---------- */
.page-faq .faq-contact {
  margin-top: clamp(22px, 3vw, 32px);
  padding: 20px 20px 22px;
  border: 1px solid var(--line);
  border-left: 2px solid var(--orange);
  background: var(--charcoal);
  position: relative;
}

.page-faq .faq-contact__label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--orange);
}

.page-faq .faq-contact__line {
  margin: 0 0 8px;
  font-size: 15px;
  line-height: 1.6;
  color: var(--mist);
}

.page-faq .faq-contact__line a {
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid rgba(184, 255, 60, 0.5);
}

.page-faq .faq-contact__line a:hover,
.page-faq .faq-contact__line a:focus-visible {
  background: var(--lime);
  color: var(--ink);
  outline: none;
}

.page-faq .faq-contact__note {
  margin: 12px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--gray);
}

/* ---------- 响应式 ---------- */
@media (min-width: 560px) {
  .page-faq .faq-index__group {
    display: grid;
    grid-template-columns: 120px minmax(0, 1fr);
    gap: 10px;
    align-items: start;
  }

  .page-faq .faq-index__group-title {
    padding-left: 0;
    margin-top: 7px;
  }

  .page-faq .faq-index__group + .faq-index__group {
    margin-top: 12px;
  }
}

@media (min-width: 768px) {
  .page-faq .faq-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 1000px) {
  .page-faq .faq-layout {
    grid-template-columns: var(--faq-index-w) minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }

  .page-faq .faq-index {
    position: sticky;
    top: calc(var(--header-h, 76px) + 20px);
    max-height: calc(100vh - var(--header-h, 76px) - 48px);
    overflow-y: auto;
    padding: 22px 18px;
  }

  .page-faq .faq-index__group {
    display: block;
  }

  .page-faq .faq-index__group-title {
    padding-left: 12px;
    margin-top: 0;
  }

  .page-faq .faq-item__a {
    margin-left: 28px;
    max-width: 68ch;
  }

  .page-faq .faq-figure {
    max-width: 760px;
  }
}

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