.page-faq {
  --faq-gap: 56px;
  --faq-rule: #1B3A57;
  --faq-lead: #C7D6E4;
  --faq-body-light: #33475E;
  --faq-num-light: #0E6C84;
  background: #0B1E33;
  color: #F2F6FA;
}

/* ---------- 首屏 ---------- */
.page-faq .page-hero {
  position: relative;
  overflow: hidden;
  padding: calc(var(--header-h) + 26px) 0 40px;
  border-bottom: 1px solid var(--faq-rule);
}
.page-faq .page-hero .grid-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
}
.page-faq .hero-layout {
  position: relative;
  display: grid;
  gap: 30px;
  align-items: end;
}
.page-faq .hero-text .breadcrumb {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
}
.page-faq .hero-kicker {
  margin: 20px 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: #00E5FF;
}
.page-faq h1 {
  margin: 0;
  font-size: clamp(30px, 7.2vw, 52px);
  line-height: 1.1;
  font-weight: 800;
  letter-spacing: -.02em;
  color: #F2F6FA;
  max-width: 22ch;
}
.page-faq .hero-lead {
  margin: 18px 0 0;
  max-width: 40rem;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--faq-lead);
}
.page-faq .hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 22px;
}
.page-faq .hero-media {
  margin: 0;
  aspect-ratio: 16 / 11;
  overflow: hidden;
}
.page-faq .hero-media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ---------- 分组索引条 ---------- */
.page-faq .index-bar {
  background: #06121F;
  border-bottom: 1px solid var(--faq-rule);
}
.page-faq .index-list {
  display: flex;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}
.page-faq .index-list::-webkit-scrollbar {
  display: none;
}
.page-faq .index-list li {
  position: relative;
  flex: 0 0 auto;
}
.page-faq .index-list li::before {
  content: "";
  position: absolute;
  left: 16px;
  top: 50%;
  width: 5px;
  height: 5px;
  border: 1px solid #00E5FF;
  transform: translateY(-50%) rotate(45deg);
}
.page-faq .index-list a {
  display: block;
  padding: 15px 20px 15px 30px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .02em;
  color: #7FE3FF;
  text-decoration: none;
  white-space: nowrap;
  transition: background-color 200ms var(--ease), color 200ms var(--ease);
}
.page-faq .index-list a:hover,
.page-faq .index-list a:focus-visible {
  background: rgba(0, 229, 255, .08);
  color: #F2F6FA;
}
.page-faq .index-list a:focus-visible {
  outline: 2px solid #00E5FF;
  outline-offset: -2px;
}

/* ---------- 问答分组 ---------- */
.page-faq .faq-group {
  padding: var(--faq-gap) 0;
  border-bottom: 1px solid rgba(27, 58, 87, .6);
}
.page-faq .group-layout {
  display: grid;
  gap: 26px;
}
.page-faq .group-num {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .14em;
  color: #7FE3FF;
}
.page-faq .group-num::before {
  content: "";
  width: 28px;
  height: 1px;
  background: #00E5FF;
}
.page-faq .group-head h2 {
  margin: 0;
  font-size: clamp(22px, 4.2vw, 34px);
  line-height: 1.2;
  font-weight: 800;
  letter-spacing: -.02em;
  color: #F2F6FA;
}
.page-faq .group-intro {
  margin: 14px 0 0;
  max-width: 34rem;
  font-size: 15px;
  line-height: 1.78;
  color: #8A9BAE;
}

/* ---------- 问答条目 ---------- */
.page-faq .qa-list {
  display: grid;
  border-top: 1px solid var(--faq-rule);
}
.page-faq .qa-item {
  border-bottom: 1px solid var(--faq-rule);
  padding: 18px 0;
  transition: border-color 200ms var(--ease);
}
.page-faq .qa-item summary {
  position: relative;
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding-left: 18px;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
  letter-spacing: -.01em;
  color: #F2F6FA;
  cursor: pointer;
  list-style: none;
}
.page-faq .qa-item summary::-webkit-details-marker {
  display: none;
}
.page-faq .qa-item summary::before {
  content: "";
  position: absolute;
  left: 0;
  top: .55em;
  width: 2px;
  height: 1em;
  background: #00E5FF;
  transition: height 200ms var(--ease), background-color 200ms var(--ease);
}
.page-faq .qa-item summary::after {
  content: "+";
  margin-left: auto;
  padding-left: 12px;
  font-family: var(--font-mono);
  font-size: 15px;
  line-height: 1.5;
  color: #7FE3FF;
}
.page-faq .qa-item[open] summary::after {
  content: "–";
  color: #FF6B35;
}
.page-faq .qa-item[open] summary::before {
  height: 1.35em;
}
.page-faq .qa-item summary:hover {
  color: #7FE3FF;
}
.page-faq .qa-item summary:focus-visible {
  outline: 2px solid #00E5FF;
  outline-offset: 3px;
}
.page-faq .qa-body {
  margin-top: 12px;
  padding-left: 18px;
  max-width: 42rem;
  animation: page-faq-fade 240ms var(--ease) both;
}
.page-faq .qa-body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--faq-lead);
}
.page-faq .qa-body a {
  color: #00E5FF;
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 229, 255, .45);
}
.page-faq .qa-body a:hover,
.page-faq .qa-body a:focus-visible {
  color: #7FE3FF;
  border-bottom-color: #7FE3FF;
}
.page-faq .qa-body a:focus-visible {
  outline: 2px solid #00E5FF;
  outline-offset: 2px;
}

@keyframes page-faq-fade {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: none; }
}

/* ---------- 服务边界：浅底反转段 ---------- */
.page-faq .boundary-band {
  background: #EDF1F6;
  color: #0B1E33;
  padding: var(--faq-gap) 0;
  border-top: 2px solid #FF6B35;
}
.page-faq .boundary-media {
  margin: 0 0 34px;
  aspect-ratio: 5 / 2;
  overflow: hidden;
}
.page-faq .boundary-media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.page-faq .group-head--light .group-num {
  color: var(--faq-num-light);
}
.page-faq .group-head--light .group-num::before {
  background: var(--faq-num-light);
}
.page-faq .group-head--light h2 {
  color: #0B1E33;
}
.page-faq .group-head--light .group-intro {
  color: #3A4F66;
}
.page-faq .qa-list--light {
  margin-top: 26px;
  border-top-color: rgba(58, 79, 102, .45);
}
.page-faq .qa-list--light .qa-item {
  border-bottom-color: rgba(58, 79, 102, .45);
  padding: 20px 0;
}
.page-faq .qa-list--light .qa-item summary {
  color: #0B1E33;
}
.page-faq .qa-list--light .qa-item summary::before {
  background: var(--faq-num-light);
}
.page-faq .qa-list--light .qa-item summary::after {
  color: var(--faq-num-light);
}
.page-faq .qa-list--light .qa-item[open] summary::after {
  color: #C24A16;
}
.page-faq .qa-list--light .qa-item summary:hover {
  color: var(--faq-num-light);
}
.page-faq .qa-list--light .qa-body p {
  color: var(--faq-body-light);
}

/* ---------- 收尾与行动 ---------- */
.page-faq .faq-group--next {
  border-bottom: none;
  padding-bottom: calc(var(--faq-gap) + 12px);
}
.page-faq .next-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 30px 0 0;
}

/* ---------- 平板与桌面 ---------- */
@media (min-width: 780px) {
  .page-faq {
    --faq-gap: 72px;
  }
  .page-faq .page-hero {
    padding: calc(var(--header-h) + 48px) 0 56px;
  }
  .page-faq .hero-layout {
    grid-template-columns: minmax(0, 1fr) minmax(260px, 340px);
    gap: 48px;
    align-items: center;
  }
  .page-faq .hero-media {
    aspect-ratio: 9 / 13;
  }
  .page-faq .index-list {
    flex-wrap: wrap;
    overflow-x: visible;
  }
  .page-faq .group-layout {
    grid-template-columns: minmax(0, 290px) minmax(0, 1fr);
    gap: 44px;
    align-items: start;
  }
  .page-faq .group-head {
    position: sticky;
    top: calc(var(--header-h) + 28px);
  }
  .page-faq .boundary-band .group-head {
    position: static;
    max-width: 46rem;
  }
}

@media (min-width: 1080px) {
  .page-faq .group-layout {
    grid-template-columns: minmax(0, 22%) minmax(0, 1fr);
    gap: 56px;
  }
  .page-faq .qa-item {
    display: grid;
    grid-template-columns: minmax(200px, 32%) minmax(0, 1fr);
    gap: 0 36px;
    align-items: start;
    padding: 20px 0;
  }
  .page-faq .qa-item > .qa-body {
    grid-column: 2;
    margin-top: 2px;
    padding-left: 0;
  }
  .page-faq .group-intro {
    font-size: 14.5px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa-body {
    animation: none;
  }
  .page-faq .qa-item summary::before,
  .page-faq .qa-item summary::after,
  .page-faq .index-list a {
    transition: none;
  }
}