.page-faq {
  --faq-index-w: 252px;
  overflow-x: clip;
  color: var(--moon);
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  position: relative;
  isolation: isolate;
  padding: calc(var(--header-h) + clamp(26px, 5vw, 60px)) 0 clamp(34px, 5vw, 54px);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  top: -34%;
  left: -12%;
  right: -12%;
  height: 640px;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(55% 68% at 22% 36%, rgba(124, 92, 255, .26), transparent 68%),
    radial-gradient(46% 60% at 84% 20%, rgba(61, 227, 206, .13), transparent 72%);
}

.page-faq .crumbs {
  margin-bottom: 4px;
}

.page-faq .crumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 13px;
  font-family: var(--font-mono);
  color: var(--dust);
}

.page-faq .crumbs li {
  display: flex;
  align-items: center;
  gap: 8px;
}

.page-faq .crumbs li + li::before {
  content: "/";
  color: var(--rock);
}

.page-faq .crumbs a {
  color: var(--dust);
  text-decoration: none;
  transition: color .25s var(--ease);
}

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

.page-faq .faq-hero h1 {
  margin: 14px 0 0;
  max-width: 20ch;
  font-size: clamp(30px, 5.4vw, 56px);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -0.01em;
}

.page-faq .faq-hero h1 .cut {
  display: block;
  margin-top: 6px;
  padding-left: clamp(10px, 2vw, 26px);
  color: var(--moon);
  opacity: .82;
}

.page-faq .faq-hero__lede {
  margin: 20px 0 0;
  max-width: 54ch;
  font-size: clamp(15px, 1.7vw, 17px);
  font-weight: 300;
  line-height: 1.85;
  color: var(--dust);
}

.page-faq .faq-hero__hud {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 30px;
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-hero__hud li {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding-left: 13px;
  border-left: 2px solid rgba(255, 138, 61, .6);
}

.page-faq .faq-hero__k {
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--dust);
}

.page-faq .faq-hero__v {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 18px;
  font-weight: 700;
  color: var(--score);
}

/* ---------- 主体骨架 ---------- */

.page-faq .faq-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
  padding-bottom: clamp(56px, 9vw, 112px);
}

.page-faq .faq-index {
  display: none;
}

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

/* ---------- 章节头 ---------- */

.page-faq .faq-block {
  padding: clamp(28px, 4vw, 46px) 0;
  border-top: 1px solid var(--line);
}

.page-faq .faq-block:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-faq .faq-block__head {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 22px;
}

.page-faq .faq-block__num {
  flex: none;
  padding-top: 7px;
  border-top: 2px solid var(--clay);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--clay);
}

.page-faq .faq-block__intro h2 {
  margin: 0;
  font-size: clamp(21px, 2.8vw, 28px);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.01em;
}

.page-faq .faq-block__intro p {
  margin: 8px 0 0;
  max-width: 44ch;
  font-size: 14.5px;
  font-weight: 300;
  line-height: 1.7;
  color: var(--dust);
}

/* ---------- 两步流程 ---------- */

.page-faq .qa-steps {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0 0 18px;
  padding: 14px 16px;
  border: 1px dashed rgba(61, 227, 206, .34);
  border-radius: var(--radius);
  background: rgba(12, 18, 32, .6);
  color: rgba(61, 227, 206, .6);
}

.page-faq .qa-steps__node {
  flex: none;
  padding: 6px 14px;
  border: 1px solid rgba(61, 227, 206, .45);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .02em;
  color: var(--cyan);
  white-space: nowrap;
}

.page-faq .qa-steps__line {
  flex: 1 1 auto;
  min-width: 28px;
  max-width: 160px;
  height: 6px;
}

/* ---------- 问答条目 ---------- */

.page-faq .qa-list {
  display: grid;
  gap: 10px;
}

.page-faq .qa {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(12, 18, 32, .94), rgba(12, 18, 32, .58));
  transition: border-color .25s var(--ease), box-shadow .25s var(--ease);
}

.page-faq .qa:hover {
  border-color: rgba(61, 227, 206, .34);
}

.page-faq .qa[open] {
  border-color: rgba(61, 227, 206, .46);
  box-shadow: 0 14px 34px -26px rgba(61, 227, 206, .9);
}

.page-faq .qa__q {
  position: relative;
  display: block;
  padding: 15px 46px 15px 18px;
  font-size: 16px;
  font-weight: 500;
  line-height: 1.55;
  color: var(--moon);
  cursor: pointer;
  list-style: none;
  transition: color .25s var(--ease);
}

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

.page-faq .qa__q::after {
  content: "";
  position: absolute;
  right: 20px;
  top: 50%;
  width: 8px;
  height: 8px;
  margin-top: -6px;
  border-right: 2px solid var(--cyan);
  border-bottom: 2px solid var(--cyan);
  transform: rotate(45deg);
  transform-origin: center;
  transition: transform .28s var(--ease);
}

.page-faq .qa[open] .qa__q::after {
  transform: rotate(225deg);
}

.page-faq .qa__q:hover {
  color: var(--cyan);
}

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

.page-faq .qa__a {
  padding: 0 18px 18px 20px;
  font-size: 15px;
  font-weight: 300;
  line-height: 1.85;
  color: var(--dust);
  box-shadow: inset 2px 0 0 transparent;
  transition: box-shadow .3s var(--ease);
}

.page-faq .qa[open] .qa__a {
  box-shadow: inset 2px 0 0 var(--cyan);
}

.page-faq .qa__a p + p {
  margin-top: 8px;
}

.page-faq .qa__a a,
.page-faq .faq-note a,
.page-faq .faq-index__foot a {
  color: var(--cyan);
  text-decoration: underline;
  text-decoration-color: rgba(61, 227, 206, .4);
  text-underline-offset: 3px;
  transition: text-decoration-color .25s var(--ease);
}

.page-faq .qa__a a:hover,
.page-faq .faq-note a:hover,
.page-faq .faq-index__foot a:hover {
  text-decoration-color: var(--cyan);
}

.page-faq .val {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: .95em;
  color: var(--moon);
}

/* ---------- 配图 ---------- */

.page-faq .faq-figure {
  margin: 20px 0 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--ink-800);
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-faq .faq-figure figcaption {
  padding: 11px 16px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  font-weight: 300;
  line-height: 1.6;
  color: var(--dust);
}

/* ---------- 收尾与动作 ---------- */

.page-faq .faq-note {
  margin: 18px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--clay);
  font-size: 14px;
  font-weight: 300;
  line-height: 1.75;
  color: var(--dust);
}

.page-faq .faq-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

/* ---------- 桌面：左侧粘性索引 ---------- */

@media (min-width: 1000px) {
  .page-faq .faq-grid {
    grid-template-columns: var(--faq-index-w) minmax(0, 1fr);
    gap: clamp(36px, 5vw, 76px);
  }

  .page-faq .faq-index {
    display: block;
    position: sticky;
    top: calc(var(--header-h) + 28px);
    align-self: start;
    max-height: calc(100vh - var(--header-h) - 56px);
    overflow-y: auto;
    padding-right: 6px;
    scrollbar-width: thin;
  }
}

.page-faq .faq-index__title {
  margin: 0 0 14px;
  font-size: 11px;
  font-family: var(--font-mono);
  letter-spacing: .18em;
  color: var(--rock);
}

.page-faq .faq-index__list {
  display: grid;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-index__link {
  display: block;
  padding: 7px 8px 7px 14px;
  border-left: 2px solid rgba(27, 36, 56, .9);
  font-size: 13.5px;
  font-weight: 300;
  line-height: 1.5;
  color: var(--dust);
  text-decoration: none;
  transition: color .22s var(--ease), border-color .22s var(--ease), padding-left .22s var(--ease);
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  padding-left: 18px;
  border-left-color: var(--cyan);
  color: var(--moon);
  outline: none;
}

.page-faq .faq-index__foot {
  margin: 20px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  font-weight: 300;
  line-height: 1.7;
  color: var(--dust);
}

/* ---------- 窄屏 ---------- */

@media (max-width: 560px) {
  .page-faq .qa-steps {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }

  .page-faq .qa-steps__line {
    display: none;
  }

  .page-faq .qa-steps__node {
    width: 100%;
    text-align: center;
  }

  .page-faq .faq-block__head {
    gap: 12px;
  }

  .page-faq .faq-actions .btn {
    flex: 1 1 100%;
    text-align: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa,
  .page-faq .qa__q,
  .page-faq .qa__q::after,
  .page-faq .qa__a,
  .page-faq .faq-index__link,
  .page-faq .crumbs a {
    transition: none;
  }
}