.page-faq {
  --faq-gutter: clamp(1rem, 3vw, 2.5rem);
  --faq-answer-indent: 3.2rem;
  display: block;
}

.page-faq .breadcrumb {
  padding: clamp(1rem, 2.4vw, 1.6rem) 0 .25rem;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-intro {
  padding: clamp(.5rem, 1.6vw, 1rem) 0 clamp(1.6rem, 4vw, 2.6rem);
}
.page-faq .faq-intro__inner {
  display: grid;
  gap: clamp(1.4rem, 3.4vw, 2.4rem);
  align-items: end;
}
.page-faq .faq-intro__lead {
  max-width: 44rem;
}
.page-faq .faq-intro__lead .display-title {
  margin: .5rem 0 1rem;
}
.page-faq .faq-intro__lead .prose {
  color: var(--mist);
  max-width: 38em;
}

.page-faq .faq-metrics {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--rail);
  border: 1px solid var(--rail);
}
.page-faq .faq-metric {
  background: linear-gradient(165deg, var(--ink), #0B1D1A);
  padding: .9rem 1rem 1rem;
  display: flex;
  flex-direction: column;
  gap: .28rem;
}
.page-faq .faq-metric__value {
  font-family: var(--font-mono);
  font-size: clamp(1.3rem, 2.6vw, 1.85rem);
  line-height: 1.1;
  color: var(--cyan);
  letter-spacing: .02em;
}
.page-faq .faq-metric__label {
  font-size: .8rem;
  line-height: 1.55;
  color: var(--mist);
}

/* ---------- 横图 ---------- */
.page-faq .faq-banner {
  margin: 0 0 clamp(1.8rem, 4.4vw, 3rem);
  border: 1px solid var(--rail);
}
.page-faq .faq-banner img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* ---------- 主体两栏 ---------- */
.page-faq .faq-body {
  display: grid;
  gap: clamp(1.4rem, 3.6vw, 2.6rem);
  align-items: start;
}

/* 侧栏 */
.page-faq .faq-nav {
  position: relative;
  border: 1px solid var(--rail);
  background: linear-gradient(160deg, rgba(27, 58, 52, .95), rgba(15, 42, 36, .6));
  padding: 1rem 1.05rem 1.2rem;
}
.page-faq .faq-nav::after {
  content: "";
  position: absolute;
  top: -1px;
  right: -1px;
  width: 0;
  height: 0;
  border-top: 20px solid var(--night);
  border-left: 20px solid transparent;
  pointer-events: none;
}
.page-faq .faq-nav__title {
  margin: 0;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: .01em;
  color: var(--paper);
}
.page-faq .faq-nav__note {
  margin: .35rem 0 .7rem;
}
.page-faq .faq-nav__list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-faq .faq-nav__link {
  display: flex;
  align-items: center;
  gap: .6rem;
  min-height: 44px;
  padding: .35rem .2rem;
  color: var(--paper);
  text-decoration: none;
  font-size: .92rem;
  border-bottom: 1px solid var(--rail);
  transition: color .18s var(--ease), padding-left .18s var(--ease);
}
.page-faq .faq-nav__link:hover {
  color: var(--cyan);
  padding-left: .55rem;
}
.page-faq .faq-nav__link:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}
.page-faq .faq-nav__num {
  color: var(--amber);
  font-size: .76rem;
  letter-spacing: .1em;
}

/* ---------- 问答分组 ---------- */
.page-faq .faq-group {
  scroll-margin-top: calc(var(--nav-h) + 1rem);
  padding-top: clamp(1.4rem, 3.4vw, 2rem);
}
.page-faq .faq-group + .faq-group {
  margin-top: clamp(1.6rem, 4vw, 2.8rem);
  border-top: 1px solid var(--rail);
}
.page-faq .faq-group__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: .5rem .9rem;
  padding-bottom: 1rem;
}
.page-faq .faq-group__num {
  color: var(--amber);
  font-size: .8rem;
  letter-spacing: .12em;
}
.page-faq .faq-group__head h2 {
  margin: 0;
}
.page-faq .faq-group__desc {
  flex: 1 1 100%;
  margin: 0;
  color: var(--mist);
  font-size: .95rem;
  line-height: 1.7;
  max-width: 46em;
}

/* ---------- 折叠条目 ---------- */
.page-faq .faq-item {
  border-top: 1px solid var(--rail);
  transition: background-color .18s var(--ease);
}
.page-faq .faq-item:hover {
  background-color: rgba(53, 240, 206, .035);
}
.page-faq .faq-item[open] {
  background-image: linear-gradient(90deg, rgba(53, 240, 206, .06), rgba(53, 240, 206, 0) 72%);
}
.page-faq .faq-item__q {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: .85rem;
  align-items: start;
  min-height: 44px;
  padding: 1.05rem .35rem 1.05rem 0;
  cursor: pointer;
  list-style: none;
}
.page-faq .faq-item__q::-webkit-details-marker {
  display: none;
}
.page-faq .faq-item__q:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -2px;
}
.page-faq .faq-item__idx {
  color: var(--cyan);
  font-size: .8rem;
  letter-spacing: .08em;
  padding-top: .32rem;
}
.page-faq .faq-item__label {
  font-weight: 700;
  font-size: clamp(1rem, 1.4vw, 1.1rem);
  line-height: 1.65;
  color: var(--paper);
}
.page-faq .faq-item__mark {
  width: 13px;
  height: 13px;
  margin-top: .5rem;
  border-right: 2px solid var(--mist);
  border-bottom: 2px solid var(--mist);
  transform: rotate(45deg);
  transition: transform .22s var(--ease), border-color .22s var(--ease);
}
.page-faq .faq-item[open] .faq-item__mark {
  transform: rotate(-135deg);
  border-color: var(--cyan);
}

.page-faq .faq-item__a {
  position: relative;
  margin-left: var(--faq-answer-indent);
  padding: .15rem 0 1.35rem 1.15rem;
  color: var(--mist);
}
.page-faq .faq-item__a::before {
  content: "";
  position: absolute;
  left: 0;
  top: .3rem;
  bottom: 1.45rem;
  width: 2px;
  background: linear-gradient(180deg, rgba(53, 240, 206, 0), var(--cyan));
  transform-origin: bottom;
  animation: faqGrow .3s var(--ease) both;
}
.page-faq .faq-item__a p {
  margin: 0 0 .6rem;
  line-height: 1.78;
  max-width: 40em;
}
.page-faq .faq-item__a p:last-child {
  margin-bottom: 0;
}
.page-faq .faq-item__a .link-more {
  color: var(--cyan);
}

@keyframes faqGrow {
  from { transform: scaleY(0); }
  to { transform: scaleY(1); }
}

/* ---------- 收尾 ---------- */
.page-faq .faq-outro {
  margin-top: clamp(2.4rem, 6vw, 4.5rem);
}
.page-faq .faq-outro__media {
  margin: 0;
  border: 1px solid var(--rail);
  border-bottom: 0;
}
.page-faq .faq-outro__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.page-faq .faq-outro__body {
  border: 1px solid var(--rail);
  background: linear-gradient(140deg, var(--archive), var(--night) 78%);
  padding: clamp(1.5rem, 4vw, 2.6rem);
}
.page-faq .faq-outro__body .section-desc {
  color: var(--mist);
  max-width: 42em;
  margin: .7rem 0 1.1rem;
}
.page-faq .faq-outro__contact {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .5rem;
  margin: 0 0 1.2rem;
  color: var(--paper);
  font-size: .95rem;
}
.page-faq .faq-outro__sep {
  color: var(--rail);
}
.page-faq .faq-outro__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .8rem 1rem;
}
.page-faq .faq-outro__actions .copy-status {
  font-size: .85rem;
  color: var(--cyan);
  min-height: 1.2em;
}
.page-faq .faq-outro__actions .link-more {
  color: var(--cyan);
}

/* ---------- 断点 ---------- */
@media (min-width: 900px) {
  .page-faq .faq-intro__inner {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    gap: clamp(2rem, 4vw, 3.4rem);
  }
  .page-faq .faq-metrics {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-faq .faq-body {
    grid-template-columns: 250px minmax(0, 1fr);
    gap: clamp(2rem, 4vw, 3.6rem);
  }
  .page-faq .faq-nav {
    position: sticky;
    top: calc(var(--nav-h) + 1.5rem);
  }
}

@media (max-width: 899px) {
  .page-faq .faq-nav__list {
    display: flex;
    gap: .9rem;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    padding-bottom: .35rem;
  }
  .page-faq .faq-nav__list li {
    flex: 0 0 auto;
  }
  .page-faq .faq-nav__link {
    border-bottom: 0;
    border-left: 2px solid var(--rail);
    white-space: nowrap;
    padding: .3rem .2rem .3rem .6rem;
  }
}

@media (max-width: 719px) {
  .page-faq {
    --faq-answer-indent: 1.9rem;
  }
  .page-faq .faq-item__q {
    gap: .6rem;
  }
  .page-faq .faq-item__a {
    padding-left: .9rem;
    padding-right: .35rem;
  }
  .page-faq .faq-outro__actions .btn {
    flex: 1 1 auto;
    justify-content: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item__a::before {
    animation: none;
    transform: none;
  }
  .page-faq .faq-item__mark,
  .page-faq .faq-nav__link {
    transition: none;
  }
}