.page-faq {
  --faq-rail-w: 232px;
  --faq-shell-gap: 28px;
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: 32px 0 40px;
  background:
    radial-gradient(120% 100% at 88% -10%, rgba(53, 224, 190, 0.14), transparent 62%),
    linear-gradient(180deg, var(--ink-800), var(--ink-900));
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, var(--line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line) 1px, transparent 1px);
  background-size: 88px 88px;
  opacity: 0.5;
  mask-image: radial-gradient(120% 90% at 20% 0%, #000 0%, transparent 78%);
  -webkit-mask-image: radial-gradient(120% 90% at 20% 0%, #000 0%, transparent 78%);
}

.page-faq .faq-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 28px;
}

.page-faq .faq-hero__copy .h-display {
  margin: 12px 0 18px;
  max-width: 20ch;
}

.page-faq .faq-hero__copy .lead {
  max-width: 62ch;
}

.page-faq .faq-hero__stats {
  display: grid;
  gap: 12px;
  align-self: end;
}

.page-faq .faq-hero__stats .stat {
  background: var(--ink-700);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: 16px 18px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-faq .faq-hero__stats .stat__k {
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--haze);
}

.page-faq .faq-hero__stats .stat__v {
  font-family: var(--font-mono);
  font-size: 24px;
  line-height: 1.2;
  color: var(--paper);
  font-variant-numeric: tabular-nums;
}

.page-faq .faq-hero__stats .stat--mint .stat__v {
  color: var(--mint);
}

/* ---------- 分类信息图 ---------- */

.page-faq .faq-map {
  padding-top: 26px;
}

.page-faq .faq-map .media {
  margin: 0;
  border-radius: var(--r-xl);
  overflow: hidden;
  border: 1px solid var(--line);
}

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

.page-faq .media__cap {
  padding: 12px 18px 14px;
  font-size: 13px;
  color: var(--haze);
  background: var(--ink-800);
  line-height: 1.6;
}

/* ---------- 问答骨架 ---------- */

.page-faq .faq-shell {
  display: grid;
  gap: var(--faq-shell-gap);
  padding-top: 34px;
  padding-bottom: 72px;
}

.page-faq .faq-rail__h {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--haze);
}

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

.page-faq .faq-rail__list a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 16px;
  border-radius: var(--pill);
  border: 1px solid var(--line);
  background: var(--ink-800);
  color: var(--haze);
  font-size: 14px;
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--dur) var(--ease), background-color var(--dur) var(--ease),
    border-color var(--dur) var(--ease);
}

.page-faq .faq-rail__idx {
  font-size: 12px;
  color: var(--mint-soft);
  opacity: 0.8;
}

.page-faq .faq-rail__list a:hover,
.page-faq .faq-rail__list a:focus-visible {
  color: var(--paper);
  border-color: var(--line-strong);
  background: var(--ink-700);
}

.page-faq .faq-rail__list a:focus-visible {
  outline: 2px solid var(--mint);
  outline-offset: 2px;
}

/* ---------- 分组 ---------- */

.page-faq .faq-body {
  display: grid;
  gap: 40px;
  min-width: 0;
}

.page-faq .faq-group {
  min-width: 0;
  scroll-margin-top: 24px;
}

.page-faq .faq-group__head {
  padding-left: 16px;
  border-left: 2px solid var(--line);
  margin-bottom: 12px;
  transition: border-color var(--dur) var(--ease);
}

.page-faq .faq-group:target .faq-group__head {
  border-left-color: var(--mint);
}

.page-faq .faq-group__head .h-section {
  margin: 8px 0 0;
}

.page-faq .faq-group__note {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--haze);
  max-width: 58ch;
}

.page-faq .faq-figure {
  margin: 0 0 8px;
}

/* ---------- 单条问答 ---------- */

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

.page-faq .qa:last-of-type {
  border-bottom: 1px solid var(--line);
}

.page-faq .qa summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
  padding: 18px 4px;
}

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

.page-faq .qa summary:focus-visible {
  outline: 2px solid var(--mint);
  outline-offset: -2px;
  border-radius: var(--r-md);
}

.page-faq .qa__q-text {
  margin: 0;
  font-family: var(--font-body);
  font-size: 17px;
  font-weight: 600;
  line-height: 1.65;
  color: var(--paper);
  transition: color var(--dur) var(--ease);
}

.page-faq .qa summary:hover .qa__q-text {
  color: var(--mint-soft);
}

.page-faq .qa__mark {
  flex: none;
  position: relative;
  width: 22px;
  height: 22px;
  margin-top: 3px;
  border-radius: 50%;
  border: 1px solid var(--line-strong);
  transition: transform var(--dur) var(--ease), background-color var(--dur) var(--ease),
    border-color var(--dur) var(--ease);
}

.page-faq .qa__mark::before,
.page-faq .qa__mark::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: var(--mint-soft);
  transition: opacity var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-faq .qa__mark::before {
  width: 10px;
  height: 1.5px;
}

.page-faq .qa__mark::after {
  width: 1.5px;
  height: 10px;
}

.page-faq .qa[open] .qa__mark {
  background: var(--mint);
  border-color: var(--mint);
  transform: rotate(90deg);
}

.page-faq .qa[open] .qa__mark::before,
.page-faq .qa[open] .qa__mark::after {
  background: var(--on-mint);
}

.page-faq .qa[open] .qa__mark::after {
  opacity: 0;
}

.page-faq .qa__body {
  max-width: 68ch;
  padding: 0 4px 22px;
}

.page-faq .qa[open] .qa__body {
  animation: faq-body-in var(--dur) var(--ease);
}

.page-faq .qa__short {
  margin: 0 0 12px;
  padding-left: 14px;
  border-left: 2px solid var(--mint);
  font-size: 16px;
  line-height: 1.7;
  color: var(--paper);
}

.page-faq .qa__body p {
  margin: 0 0 10px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--haze);
}

.page-faq .qa__body p:last-child {
  margin-bottom: 0;
}

.page-faq .qa__body a {
  color: var(--mint);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 224, 190, 0.4);
}

.page-faq .qa__body a:hover,
.page-faq .qa__body a:focus-visible {
  color: var(--mint-soft);
  border-bottom-color: var(--mint-soft);
}

.page-faq .qa__more {
  font-size: 14px;
}

@keyframes faq-body-in {
  from {
    opacity: 0;
    transform: translateY(-6px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* ---------- 结尾引导 ---------- */

.page-faq .faq-cta {
  margin-top: 30px;
  padding: 26px 22px;
  border-radius: var(--r-xl);
  border: 1px solid var(--line);
  background:
    radial-gradient(120% 140% at 100% 0%, rgba(53, 224, 190, 0.12), transparent 60%),
    var(--ink-800);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
}

.page-faq .faq-cta p {
  flex: 1 1 240px;
  margin: 0;
  font-size: 16px;
  line-height: 1.7;
  color: var(--paper);
}

/* ---------- 响应式 ---------- */

@media (min-width: 620px) {
  .page-faq .faq-hero__stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 960px) {
  .page-faq .faq-hero {
    padding: 52px 0 60px;
  }

  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    align-items: end;
    gap: 56px;
  }

  .page-faq .faq-shell {
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
    gap: 56px;
    padding-top: 48px;
    padding-bottom: 96px;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: 32px;
    align-self: start;
  }

  .page-faq .faq-rail__list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 2px;
  }

  .page-faq .faq-rail__list a {
    border-radius: var(--r-md);
    border: 0;
    border-left: 2px solid var(--line);
    background: transparent;
    padding: 11px 14px;
    white-space: normal;
  }

  .page-faq .faq-rail__list a:hover,
  .page-faq .faq-rail__list a:focus-visible {
    border-left-color: var(--mint);
    background: var(--mint-wash);
    color: var(--paper);
  }

  .page-faq .faq-body {
    gap: 56px;
  }

  .page-faq .qa summary {
    padding: 22px 4px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa[open] .qa__body {
    animation: none;
  }

  .page-faq .qa__mark,
  .page-faq .qa__q-text,
  .page-faq .faq-rail__list a {
    transition: none;
  }
}