.page-faq {
  --faq-rail-w: 272px;
  --faq-rule: var(--line-soft);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding-block: clamp(20px, 4vw, 44px) clamp(36px, 7vw, 84px);
  overflow: hidden;
}

.page-faq .faq-hero .breadcrumb {
  margin-bottom: clamp(20px, 4vw, 40px);
  font-size: 12px;
  letter-spacing: 0.08em;
}

.page-faq .faq-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 52px);
  align-items: end;
}

.page-faq .faq-hero__copy h1 {
  margin: 0.35em 0 0.5em;
  max-width: 15ch;
}

.page-faq .faq-hero__copy .lede {
  max-width: 58ch;
}

.page-faq .faq-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 30px);
}

.page-faq .faq-hero__figure {
  margin: 0;
  border-radius: var(--r-lg);
  overflow: hidden;
  aspect-ratio: 16 / 7;
  background: linear-gradient(150deg, rgba(23, 63, 99, 0.85), rgba(6, 26, 46, 0.95));
  border: 1px solid var(--line-soft);
}

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

.page-faq .faq-status {
  display: flex;
  flex-wrap: wrap;
  gap: 14px clamp(20px, 4vw, 48px);
  margin-top: clamp(28px, 5vw, 54px);
  padding-top: 18px;
  border-top: 1px solid var(--line-soft);
}

.page-faq .faq-status .status-panel__val {
  font-family: var(--mono);
  color: var(--cyan);
}

/* ---------- 分类入口 ---------- */
.page-faq .faq-index__head {
  max-width: 62ch;
}

.page-faq .faq-index__head h2 {
  margin: 0.3em 0 0.4em;
}

.page-faq .faq-index__lead {
  color: var(--muted);
  margin: 0;
}

.page-faq .faq-map {
  list-style: none;
  margin: clamp(22px, 3vw, 36px) 0 0;
  padding: 0;
}

.page-faq .faq-map .map-row {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 14px;
  align-items: baseline;
  padding: 16px 4px;
  border-bottom: 1px solid var(--line-soft);
  text-decoration: none;
  color: var(--paper);
  transition: color var(--t), padding-left var(--t), border-color var(--t);
}

.page-faq .faq-map .map-row:hover,
.page-faq .faq-map .map-row:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan);
  padding-left: 12px;
}

.page-faq .faq-map .map-row__title {
  font-size: clamp(17px, 2vw, 21px);
  font-weight: 300;
}

.page-faq .faq-map .map-row__meta {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
  text-align: right;
}

/* ---------- 主体双栏 ---------- */
.page-faq .faq-body__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 60px);
}

.page-faq .faq-rail {
  align-self: start;
}

.page-faq .faq-rail .rail-label {
  margin: 0 0 14px;
}

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

.page-faq .filter-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
  padding: 10px 14px;
  border: 1px solid var(--line-soft);
  border-radius: 999px;
  background: rgba(13, 40, 67, 0.6);
  color: var(--paper);
  font-size: 13px;
  letter-spacing: 0.03em;
  white-space: nowrap;
  cursor: pointer;
  transition: color var(--t), border-color var(--t), background-color var(--t);
}

.page-faq .filter-btn:hover {
  border-color: var(--cyan);
  color: var(--cyan);
}

.page-faq .filter-btn.is-selected {
  border-color: var(--cyan);
  color: var(--cyan);
  background: rgba(52, 245, 208, 0.09);
}

.page-faq .faq-dot {
  width: 8px;
  height: 8px;
  flex: none;
  border-radius: 50%;
  background: var(--ink-600);
  box-shadow: 0 0 0 3px rgba(23, 63, 99, 0.55);
  transition: background-color var(--t), box-shadow var(--t);
}

.page-faq .filter-btn.is-selected .faq-dot {
  background: var(--cyan);
  box-shadow: 0 0 0 3px rgba(52, 245, 208, 0.18);
}

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

/* ---------- 问答分组 ---------- */
.page-faq .faq-group {
  position: relative;
  padding-top: clamp(26px, 4vw, 42px);
}

.page-faq .faq-group + .faq-group {
  margin-top: clamp(32px, 5vw, 58px);
  border-top: 1px solid var(--line-soft);
}

.page-faq .faq-group + .faq-group::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 132px;
  height: 5px;
  background: repeating-linear-gradient(115deg, var(--cyan) 0 2px, transparent 2px 8px);
  opacity: 0.5;
}

.page-faq .faq-group__title {
  margin: 0.35em 0 0.35em;
  font-size: clamp(22px, 2.7vw, 32px);
  font-weight: 300;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-faq .faq-group__note {
  margin: 0 0 clamp(12px, 2vw, 20px);
  max-width: 62ch;
  color: var(--muted);
  font-size: 14px;
}

.page-faq .faq-figure {
  margin: 0 0 clamp(14px, 2vw, 22px);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 12 / 7;
  object-fit: cover;
}

.page-faq .faq-figure .media__caption {
  padding: 10px 2px 0;
  font-size: 13px;
  color: var(--muted);
}

/* ---------- 单条问答 ---------- */
.page-faq .faq-item {
  border-bottom: 1px solid var(--line-soft);
}

.page-faq .faq-item__q {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 20px 0;
  list-style: none;
  cursor: pointer;
  font-size: clamp(17px, 1.9vw, 21px);
  font-weight: 400;
  line-height: 1.45;
  color: var(--paper);
  transition: color var(--t);
}

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

.page-faq .faq-item__q::before {
  content: "Q";
  flex: none;
  padding-top: 0.45em;
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-faq .faq-item__q::after {
  content: "+";
  margin-left: auto;
  flex: none;
  padding-top: 0.28em;
  font-family: var(--mono);
  font-size: 18px;
  line-height: 1;
  color: var(--muted);
  transition: color var(--t);
}

.page-faq .faq-item__q:hover,
.page-faq .faq-item__q:focus-visible,
.page-faq .faq-item[open] .faq-item__q {
  color: var(--cyan);
}

.page-faq .faq-item[open] .faq-item__q::after {
  content: "–";
  color: var(--cyan);
}

.page-faq .faq-item__a {
  max-width: 68ch;
  padding: 0 0 24px 30px;
  color: var(--paper);
  animation: faq-answer-in 200ms ease-out;
}

.page-faq .faq-item__a p {
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
}

@keyframes faq-answer-in {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---------- 支持分组 ---------- */
.page-faq .faq-group--support {
  --faq-pad: clamp(20px, 3vw, 32px);
  padding: var(--faq-pad);
  border-radius: var(--r-lg);
  background: linear-gradient(155deg, rgba(14, 58, 51, 0.55), rgba(6, 26, 46, 0.12));
}

.page-faq .faq-group--support::before {
  left: var(--faq-pad);
}

/* ---------- 相关页面 ---------- */
.page-faq .faq-related {
  margin-top: clamp(36px, 5vw, 64px);
  padding-top: clamp(22px, 3vw, 34px);
  border-top: 1px solid var(--line-soft);
}

.page-faq .faq-related__title {
  margin: 0.35em 0 0;
  font-size: clamp(20px, 2.3vw, 26px);
  font-weight: 300;
  color: var(--paper);
}

.page-faq .faq-related__list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-related__list a {
  display: block;
  padding: 16px 18px;
  border: 1px solid var(--line-soft);
  border-radius: var(--r-md);
  color: var(--paper);
  text-decoration: none;
  font-size: 15px;
  transition: color var(--t), border-color var(--t), transform var(--t);
}

.page-faq .faq-related__list a:hover,
.page-faq .faq-related__list a:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan);
  transform: translateX(4px);
}

.page-faq .faq-related__list span {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  color: var(--muted);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-faq .faq-related__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.85fr);
  }

  .page-faq .faq-hero__figure {
    aspect-ratio: 5 / 6;
  }
}

@media (min-width: 1000px) {
  .page-faq .faq-body__grid {
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
  }

  .page-faq .faq-rail {
    position: sticky;
    top: 104px;
  }

  .page-faq .faq-rail__row {
    flex-direction: column;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-faq .filter-btn {
    width: 100%;
    justify-content: flex-start;
    border-radius: var(--r-md);
  }

  .page-faq .faq-rail__back {
    display: inline-flex;
    margin-top: 20px;
    font-size: 13px;
    letter-spacing: 0.04em;
    color: var(--muted);
    text-decoration: none;
    transition: color var(--t);
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item__a {
    animation: none;
  }

  .page-faq .faq-related__list a:hover {
    transform: none;
  }
}