.page-faq {
  --faq-gutter: clamp(18px, 4vw, 56px);
  --faq-railw: 208px;
  --faq-max: 1180px;

  position: relative;
  display: block;
  overflow-x: clip;
  font-family: var(--bs-sans);
  color: var(--bs-paper);
  background-color: var(--bs-ink);
  background-image:
    linear-gradient(90deg, rgba(46, 74, 112, 0.16) 1px, transparent 1px),
    linear-gradient(180deg, rgba(46, 74, 112, 0.12) 1px, transparent 1px),
    radial-gradient(78% 52% at 94% 0%, rgba(53, 240, 160, 0.09), transparent 62%),
    radial-gradient(72% 48% at -4% 26%, rgba(18, 41, 74, 0.92), transparent 68%);
  background-size: 72px 72px, 72px 72px, 100% 100%, 100% 100%;
  padding:
    calc(var(--bs-bar) + clamp(30px, 6vw, 64px))
    var(--faq-gutter)
    clamp(64px, 9vw, 112px);
}

.page-faq a:focus-visible,
.page-faq summary:focus-visible {
  outline: 2px solid var(--bs-signal);
  outline-offset: 3px;
}

/* ---------- 面包屑 ---------- */
.page-faq__crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  width: 100%;
  max-width: var(--faq-max);
  margin: 0 0 clamp(26px, 4vw, 44px);
  font-family: var(--bs-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--bs-silver);
}

.page-faq__crumb .bs-breadcrumb__link {
  color: var(--bs-silver);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.22s var(--bs-ease), border-color 0.22s var(--bs-ease);
}

.page-faq__crumb .bs-breadcrumb__link:hover {
  color: var(--bs-signal);
  border-bottom-color: var(--bs-signal);
}

.page-faq__crumb .bs-breadcrumb__sep {
  color: var(--bs-steel);
}

/* ---------- 首屏 ---------- */
.page-faq__hero {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  align-items: center;
  width: 100%;
  max-width: var(--faq-max);
  padding-bottom: clamp(34px, 5vw, 60px);
  border-bottom: 1px solid rgba(169, 184, 204, 0.16);
}

.page-faq__eyebrow {
  margin: 0 0 12px;
  font-family: var(--bs-mono);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--bs-silver);
}

.page-faq__title {
  margin: 0 0 18px;
  font-family: var(--bs-sans);
  font-size: clamp(1.9rem, 5vw, 3.4rem);
  font-weight: 300;
  line-height: 1.08;
  letter-spacing: -0.01em;
  color: var(--bs-paper);
}

.page-faq__lede {
  margin: 0 0 clamp(20px, 3vw, 30px);
  max-width: 54ch;
  font-size: clamp(0.95rem, 1.4vw, 1.03rem);
  line-height: 1.8;
  color: var(--bs-silver);
}

.page-faq__jump {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq__jump a {
  display: inline-block;
  padding: 7px 13px;
  font-size: 0.8rem;
  letter-spacing: 0.02em;
  color: var(--bs-silver);
  text-decoration: none;
  border: 1px solid rgba(46, 74, 112, 0.9);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 7px), calc(100% - 7px) 100%, 0 100%);
  transition: color 0.22s var(--bs-ease), border-color 0.22s var(--bs-ease), background 0.22s var(--bs-ease);
}

.page-faq__jump a:hover {
  color: var(--bs-ink);
  background: var(--bs-signal);
  border-color: var(--bs-signal);
}

.page-faq__herofig {
  position: relative;
  margin: 0;
  line-height: 0;
  background: rgba(18, 41, 74, 0.7);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 0 100%);
}

.page-faq__herofig::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(140deg, rgba(53, 240, 160, 0.14), transparent 46%, rgba(5, 11, 24, 0.55));
}

.page-faq__herofig img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  filter: saturate(0.88) contrast(1.06);
}

/* ---------- 主体两栏 ---------- */
.page-faq__body {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
  width: 100%;
  max-width: var(--faq-max);
  margin-top: clamp(34px, 5vw, 62px);
}

/* ---------- 分类刻度 ---------- */
.page-faq__rail {
  display: grid;
  gap: 12px;
  align-content: start;
  min-width: 0;
}

.page-faq__railtitle {
  margin: 0;
  font-family: var(--bs-mono);
  font-size: 0.68rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--bs-silver);
  opacity: 0.75;
}

.page-faq__index {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.page-faq__index li {
  flex: 0 0 auto;
}

.page-faq__index a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 13px;
  white-space: nowrap;
  font-size: 0.84rem;
  color: var(--bs-silver);
  text-decoration: none;
  border: 1px solid rgba(46, 74, 112, 0.85);
  transition: color 0.22s var(--bs-ease), border-color 0.22s var(--bs-ease), background 0.22s var(--bs-ease);
}

.page-faq__index a .bs-mono {
  font-size: 0.66rem;
  letter-spacing: 0.08em;
  color: var(--bs-silver);
  opacity: 0.6;
  transition: color 0.22s var(--bs-ease), opacity 0.22s var(--bs-ease);
}

.page-faq__index a:hover,
.page-faq__index a:focus-visible {
  color: var(--bs-signal);
  border-color: var(--bs-signal);
}

.page-faq__index a:hover .bs-mono,
.page-faq__index a:focus-visible .bs-mono {
  color: var(--bs-signal);
  opacity: 1;
}

.page-faq__railnote {
  margin: 4px 0 0;
  font-size: 0.82rem;
  line-height: 1.7;
  color: var(--bs-silver);
}

.page-faq__railnote a {
  color: var(--bs-signal);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 240, 160, 0.42);
  transition: border-color 0.22s var(--bs-ease);
}

.page-faq__railnote a:hover {
  border-bottom-color: var(--bs-signal);
}

/* ---------- 分组 ---------- */
.page-faq__list {
  min-width: 0;
}

.page-faq__group {
  scroll-margin-top: calc(var(--bs-bar) + 24px);
  margin-bottom: clamp(40px, 6vw, 72px);
}

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

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

.page-faq__ghead .page-faq__eyebrow {
  color: var(--bs-signal);
  opacity: 0.85;
}

.page-faq__gtitle {
  position: relative;
  margin: 0;
  padding-top: 16px;
  font-family: var(--bs-sans);
  font-size: clamp(1.3rem, 2.4vw, 1.85rem);
  font-weight: 300;
  line-height: 1.3;
  letter-spacing: 0.01em;
  color: var(--bs-paper);
}

.page-faq__gtitle::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 44px;
  height: 2px;
  background: linear-gradient(90deg, var(--bs-signal), rgba(53, 240, 160, 0));
  transition: width 0.3s var(--bs-ease);
}

.page-faq__group:target .page-faq__gtitle::before {
  width: 76px;
}

/* ---------- 分组内切角配图 ---------- */
.page-faq__figcut {
  margin: 0 0 clamp(18px, 2.4vw, 26px);
  line-height: 0;
  background: rgba(18, 41, 74, 0.6);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}

.page-faq__figcut img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  filter: saturate(0.9) contrast(1.04);
}

/* ---------- 折叠问答 ---------- */
.page-faq__item {
  position: relative;
  scroll-margin-top: calc(var(--bs-bar) + 20px);
  border-bottom: 1px solid rgba(169, 184, 204, 0.14);
  transition: background 0.34s var(--bs-ease), border-color 0.34s var(--bs-ease);
}

.page-faq__item:first-of-type {
  border-top: 1px solid rgba(169, 184, 204, 0.14);
}

.page-faq__item[open] {
  background: linear-gradient(100deg, rgba(53, 240, 160, 0.07), rgba(18, 41, 74, 0.42) 44%, rgba(18, 41, 74, 0) 100%);
  border-bottom-color: rgba(53, 240, 160, 0.4);
}

.page-faq__q {
  position: relative;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: baseline;
  gap: 14px;
  padding: 20px 8px 20px 18px;
  cursor: pointer;
  list-style: none;
}

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

.page-faq__q::before {
  content: "";
  position: absolute;
  left: 0;
  top: 22px;
  bottom: 22px;
  width: 2px;
  background: var(--bs-signal);
  transform: scaleY(0);
  transform-origin: top center;
  transition: transform 0.34s var(--bs-ease);
}

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

.page-faq__qnum {
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  color: var(--bs-silver);
  opacity: 0.72;
  transition: color 0.24s var(--bs-ease), opacity 0.24s var(--bs-ease);
}

.page-faq__item[open] .page-faq__qnum {
  color: var(--bs-signal);
  opacity: 1;
}

.page-faq__qtext {
  font-size: clamp(1rem, 1.5vw, 1.14rem);
  font-weight: 500;
  line-height: 1.45;
  letter-spacing: 0.01em;
  color: var(--bs-paper);
}

.page-faq__sign {
  position: relative;
  align-self: center;
  width: 14px;
  height: 14px;
  flex: 0 0 auto;
}

.page-faq__sign::before,
.page-faq__sign::after {
  content: "";
  position: absolute;
  inset: 0;
  margin: auto;
  background: var(--bs-silver);
  transition: transform 0.3s var(--bs-ease), background 0.24s var(--bs-ease);
}

.page-faq__sign::before {
  width: 14px;
  height: 1.5px;
}

.page-faq__sign::after {
  width: 1.5px;
  height: 14px;
}

.page-faq__item[open] .page-faq__sign::before {
  background: var(--bs-signal);
}

.page-faq__item[open] .page-faq__sign::after {
  transform: scaleY(0);
}

.page-faq__a {
  padding: 0 8px 24px 18px;
}

.page-faq__a p {
  margin: 0;
  max-width: 62ch;
  padding-left: 16px;
  border-left: 2px solid rgba(169, 184, 204, 0.32);
  font-size: 0.97rem;
  line-height: 1.8;
  color: var(--bs-silver);
}

.page-faq__item[open] .page-faq__a {
  animation: faq-answer-in 0.34s var(--bs-ease) both;
}

@keyframes faq-answer-in {
  from {
    opacity: 0;
    transform: translateY(-5px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* ---------- 浅色节奏带 ---------- */
.page-faq__group--paper {
  padding: clamp(20px, 3vw, 34px);
  margin-inline: calc(-1 * clamp(12px, 2vw, 26px));
  color: var(--bs-ink);
  background: var(--bs-paper);
  border-left: 2px solid var(--bs-signal-deep);
}

.page-faq__group--paper .page-faq__eyebrow {
  color: #5b6b80;
  opacity: 1;
}

.page-faq__group--paper .page-faq__gtitle {
  color: var(--bs-ink);
}

.page-faq__group--paper .page-faq__gtitle::before {
  background: linear-gradient(90deg, var(--bs-signal-deep), rgba(14, 158, 107, 0));
}

.page-faq__group--paper .page-faq__item,
.page-faq__group--paper .page-faq__item:first-of-type {
  border-color: rgba(5, 11, 24, 0.14);
}

.page-faq__group--paper .page-faq__item[open] {
  background: linear-gradient(100deg, rgba(14, 158, 107, 0.12), rgba(255, 255, 255, 0.7) 58%, rgba(255, 255, 255, 0));
  border-bottom-color: var(--bs-signal-deep);
}

.page-faq__group--paper .page-faq__q::before {
  background: var(--bs-signal-deep);
}

.page-faq__group--paper .page-faq__qtext {
  color: var(--bs-ink);
}

.page-faq__group--paper .page-faq__qnum {
  color: #77869b;
  opacity: 1;
}

.page-faq__group--paper .page-faq__item[open] .page-faq__qnum {
  color: var(--bs-signal-deep);
}

.page-faq__group--paper .page-faq__sign::before,
.page-faq__group--paper .page-faq__sign::after {
  background: #4a5a6e;
}

.page-faq__group--paper .page-faq__item[open] .page-faq__sign::before {
  background: var(--bs-signal-deep);
}

.page-faq__group--paper .page-faq__a p {
  color: #38495d;
  border-left-color: rgba(14, 158, 107, 0.5);
}

/* ---------- 组尾按钮 ---------- */
.page-faq__more {
  margin: clamp(22px, 3vw, 32px) 0 0;
}

.page-faq__more .bs-btn {
  text-decoration: none;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-faq__hero {
    gap: clamp(32px, 4vw, 56px);
  }
}

@media (min-width: 1000px) {
  .page-faq__hero {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
  }

  .page-faq__body {
    grid-template-columns: var(--faq-railw) minmax(0, 1fr);
    gap: clamp(36px, 4vw, 72px);
    align-items: start;
  }

  .page-faq__rail {
    position: sticky;
    top: calc(var(--bs-bar) + 28px);
    gap: 14px;
  }

  .page-faq__index {
    flex-direction: column;
    gap: 0;
    padding-bottom: 0;
    overflow: visible;
    border-left: 1px solid rgba(46, 74, 112, 0.9);
  }

  .page-faq__index a {
    width: 100%;
    padding: 13px 0 13px 16px;
    margin-left: -1px;
    border: 0;
    border-left: 2px solid transparent;
    font-size: 0.92rem;
  }

  .page-faq__index a:hover,
  .page-faq__index a:focus-visible {
    color: var(--bs-signal);
    border-left-color: var(--bs-signal);
  }

  .page-faq__q {
    padding: 22px 10px 22px 20px;
    gap: 18px;
  }

  .page-faq__a {
    padding: 0 10px 26px 20px;
  }
}

@media (min-width: 1024px) {
  .page-faq {
    padding-left: calc(var(--bs-rail) + var(--faq-gutter));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq *,
  .page-faq *::before,
  .page-faq *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}