.page-faq {
  --faq-cut: 18px;
  --faq-rule: rgba(28, 58, 86, 0.9);
  --faq-index-w: 228px;
}

.page-faq *,
.page-faq *::before,
.page-faq *::after {
  box-sizing: border-box;
}

.page-faq img {
  max-width: 100%;
  height: auto;
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(26px, 5vw, 44px) 0 clamp(34px, 5vw, 58px);
  background:
    radial-gradient(120% 90% at 88% 0%, rgba(43, 227, 210, 0.16), rgba(6, 24, 43, 0) 62%),
    linear-gradient(180deg, #072033 0%, var(--deep-sea) 100%);
  border-bottom: 1px solid var(--faq-rule);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: -1px;
  z-index: -1;
  background-image:
    linear-gradient(rgba(28, 58, 86, 0.5) 1px, transparent 1px),
    linear-gradient(90deg, rgba(28, 58, 86, 0.5) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9), transparent 78%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9), transparent 78%);
  pointer-events: none;
}

.page-faq .faq-hero .crumb {
  margin-bottom: clamp(26px, 5vw, 48px);
}

.page-faq .faq-hero .eyebrow {
  margin: 0 0 14px;
  color: var(--cyan);
}

.page-faq h1 {
  margin: 0;
  max-width: 15em;
  font-size: clamp(34px, 7.4vw, 72px);
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--ice);
}

.page-faq .faq-lede {
  margin: clamp(18px, 3vw, 26px) 0 0;
  max-width: 640px;
  color: var(--mist);
  font-size: 16px;
  line-height: 1.75;
}

.page-faq .faq-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 34px;
  margin: clamp(24px, 4vw, 36px) 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-stats li {
  display: flex;
  align-items: baseline;
  gap: 8px;
  color: var(--mist);
  font-size: 12.5px;
  letter-spacing: 0.03em;
}

.page-faq .faq-stats .num {
  font-size: 22px;
  font-weight: 700;
  color: var(--ice);
}

.page-faq .faq-stats li:first-child .num {
  color: var(--cyan);
}

/* ---------- 主体骨架 ---------- */

.page-faq .faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
  padding-top: clamp(30px, 5vw, 54px);
  padding-bottom: clamp(48px, 7vw, 88px);
}

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

/* ---------- 左侧分组目录 ---------- */

.page-faq .faq-index {
  border: 1px solid var(--faq-rule);
  background: rgba(12, 39, 64, 0.5);
  padding: 16px 14px;
}

.page-faq .faq-index-title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--mist);
}

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

.page-faq .faq-index-link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  min-height: 44px;
  padding: 10px 10px 10px 12px;
  border-left: 2px solid transparent;
  color: var(--mist);
  font-size: 15px;
  line-height: 1.4;
  text-decoration: none;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.page-faq .faq-index-link .num {
  font-size: 11px;
  color: rgba(154, 176, 196, 0.75);
  transition: color 0.2s var(--ease);
}

.page-faq .faq-index-link:hover,
.page-faq .faq-index-link:focus-visible {
  color: var(--ice);
  border-left-color: var(--cyan);
  background: rgba(43, 227, 210, 0.08);
  outline: none;
}

.page-faq .faq-index-link:hover .num,
.page-faq .faq-index-link:focus-visible .num {
  color: var(--cyan);
}

.page-faq .faq-index-note {
  margin: 14px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--faq-rule);
  color: var(--mist);
  font-size: 12.5px;
  line-height: 1.7;
}

/* ---------- 分组 ---------- */

.page-faq .faq-group {
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-faq .faq-group + .faq-group {
  margin-top: clamp(44px, 6vw, 76px);
}

.page-faq .faq-group-head {
  margin-bottom: 18px;
}

.page-faq .faq-group-head .eyebrow {
  margin: 0 0 8px;
  color: var(--cyan);
}

.page-faq h2 {
  margin: 0;
  font-size: clamp(23px, 3.4vw, 34px);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -0.02em;
  color: var(--ice);
}

.page-faq .faq-group-lede {
  margin: 10px 0 0;
  max-width: 540px;
  color: var(--mist);
  font-size: 15px;
  line-height: 1.7;
}

/* ---------- 折叠问答 ---------- */

.page-faq .faq-list {
  border-top: 1px solid var(--faq-rule);
}

.page-faq .faq-item {
  border-bottom: 1px solid var(--faq-rule);
  transition: background-color 0.24s var(--ease);
}

.page-faq .faq-item[open] {
  background: linear-gradient(90deg, rgba(43, 227, 210, 0.07), rgba(43, 227, 210, 0) 58%);
}

.page-faq .faq-q {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 14px;
  min-height: 44px;
  padding: 16px 38px 16px 4px;
  cursor: pointer;
  list-style: none;
  color: var(--ice);
  font-size: 16.5px;
  line-height: 1.55;
  transition: color 0.2s var(--ease);
}

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

.page-faq .faq-q::after {
  content: "";
  position: absolute;
  right: 10px;
  top: 50%;
  width: 9px;
  height: 9px;
  border-right: 2px solid var(--mist);
  border-bottom: 2px solid var(--mist);
  transform: translateY(-70%) rotate(45deg);
  transition: transform 0.25s var(--ease), border-color 0.2s var(--ease);
}

.page-faq .faq-item[open] .faq-q::after {
  transform: translateY(-30%) rotate(-135deg);
  border-color: var(--cyan);
}

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

.page-faq .q-num {
  flex: none;
  min-width: 26px;
  padding-top: 3px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mist);
  transition: color 0.2s var(--ease);
}

.page-faq .faq-item[open] .q-num {
  color: var(--cyan);
}

.page-faq .faq-a {
  padding: 0 18px 20px 26px;
  color: var(--mist);
  font-size: 15.5px;
  line-height: 1.8;
}

.page-faq .faq-a p {
  margin: 0;
  max-width: 46em;
}

.page-faq .faq-a p + p,
.page-faq .faq-a p + ol,
.page-faq .faq-a ol + p {
  margin-top: 12px;
}

.page-faq .faq-a a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-faq .faq-a a:hover,
.page-faq .faq-a a:focus-visible {
  color: var(--ice);
}

.page-faq .faq-a ol {
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
  counter-reset: faqstep;
}

.page-faq .faq-a ol li {
  position: relative;
  counter-increment: faqstep;
  max-width: 42em;
  padding-left: 32px;
  margin-top: 10px;
}

.page-faq .faq-a ol li:first-child {
  margin-top: 0;
}

.page-faq .faq-a ol li::before {
  content: counter(faqstep, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0.15em;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--cyan);
}

/* ---------- 配图 ---------- */

.page-faq .faq-figure {
  margin: clamp(24px, 4vw, 34px) 0 0;
  border: 1px solid var(--faq-rule);
  background: var(--panel-blue);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--faq-cut)), calc(100% - var(--faq-cut)) 100%, 0 100%);
  overflow: hidden;
}

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

.page-faq .faq-figure figcaption {
  padding: 14px 20px 20px;
  color: var(--mist);
  font-size: 13px;
  line-height: 1.7;
}

.page-faq .faq-figure figcaption .num {
  margin-right: 8px;
  color: var(--cyan);
}

/* ---------- 收尾联络块 ---------- */

.page-faq .faq-ask {
  margin-top: clamp(24px, 4vw, 34px);
  padding: 22px 22px 24px;
  border: 1px solid rgba(43, 227, 210, 0.28);
  background: linear-gradient(135deg, rgba(43, 227, 210, 0.12), rgba(12, 39, 64, 0.75) 62%);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--faq-cut)), calc(100% - var(--faq-cut)) 100%, 0 100%);
}

.page-faq .faq-ask h3 {
  margin: 0;
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--ice);
}

.page-faq .faq-ask p {
  margin: 10px 0 0;
  max-width: 48em;
  color: var(--mist);
  font-size: 15px;
  line-height: 1.75;
}

.page-faq .faq-ask-mail {
  margin-top: 14px;
}

.page-faq .faq-mail {
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.01em;
  color: var(--cyan);
  word-break: break-all;
}

.page-faq .faq-ask-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 18px;
}

/* ---------- 断点 ---------- */

@media (max-width: 899px) {
  .page-faq .faq-index {
    padding: 14px 12px;
  }

  .page-faq .faq-index-list {
    display: flex;
    gap: 8px;
    overflow-x: auto;
    padding-bottom: 4px;
    scrollbar-width: thin;
  }

  .page-faq .faq-index-list li {
    flex: 0 0 auto;
  }

  .page-faq .faq-index-link {
    border-left: 0;
    border-bottom: 2px solid transparent;
    white-space: nowrap;
    padding: 10px 14px;
    background: rgba(6, 24, 43, 0.6);
  }

  .page-faq .faq-index-link:hover,
  .page-faq .faq-index-link:focus-visible {
    border-bottom-color: var(--cyan);
    border-left-color: transparent;
  }
}

@media (min-width: 640px) {
  .page-faq .faq-q {
    padding: 18px 48px 18px 4px;
    font-size: 17px;
  }

  .page-faq .faq-a {
    padding: 0 40px 22px 44px;
  }

  .page-faq .faq-q::after {
    right: 16px;
  }
}

@media (min-width: 900px) {
  .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) + 24px);
    padding: 20px 16px;
  }
}

@media (min-width: 1200px) {
  .page-faq .faq-stats li {
    font-size: 13px;
  }

  .page-faq .faq-stats .num {
    font-size: 26px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-index-link,
  .page-faq .faq-q,
  .page-faq .faq-q::after,
  .page-faq .q-num,
  .page-faq .faq-item {
    transition: none;
  }
}