.page-faq {
  --faq-rail-bg: var(--pitch-700);
  --faq-gap: clamp(28px, 4vw, 56px);
  background: var(--pitch-900);
  color: var(--paper-050);
  padding-bottom: clamp(48px, 8vw, 96px);
}

.page-faq a:focus-visible,
.page-faq summary:focus-visible {
  outline: 2px solid var(--signal-600);
  outline-offset: 3px;
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  position: relative;
  border-bottom: var(--edge);
  padding: clamp(20px, 4vw, 40px) 0 clamp(32px, 6vw, 60px);
  background-color: var(--pitch-900);
  background-image:
    radial-gradient(90% 85% at 92% 4%, rgba(255, 90, 31, .16), transparent 62%),
    repeating-linear-gradient(90deg, rgba(42, 95, 78, .16) 0 1px, transparent 1px 78px);
}

.page-faq .faq-hero__title {
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -.02em;
  line-height: 1.1;
  font-size: clamp(2rem, 6.4vw, 4rem);
  margin: 16px 0 0;
  max-width: 22ch;
  text-wrap: balance;
}

.page-faq .faq-hero__lead {
  max-width: 42rem;
  margin: 22px 0 0;
  font-size: var(--fs-3);
  line-height: 1.85;
  color: rgba(244, 247, 245, .86);
}

.page-faq .faq-facts {
  list-style: none;
  margin: clamp(28px, 4vw, 46px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2px;
  background: var(--line-500);
  border: 2px solid var(--line-500);
}

@media (min-width: 760px) {
  .page-faq .faq-facts {
    grid-template-columns: repeat(4, 1fr);
  }
}

.page-faq .faq-facts li {
  background: var(--pitch-900);
  padding: 16px 14px 18px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-faq .faq-facts__n {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(1.75rem, 4.4vw, 2.5rem);
  line-height: 1;
  color: var(--signal-600);
}

.page-faq .faq-facts__t {
  font-size: var(--fs-2);
  line-height: 1.55;
  color: var(--steel-300);
}

/* ---------- 主体布局 ---------- */

.page-faq .faq-main {
  padding-top: clamp(36px, 6vw, 72px);
}

.page-faq .faq-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 40px);
}

@media (min-width: 900px) {
  .page-faq .faq-layout {
    grid-template-columns: 5fr 7fr;
    gap: clamp(32px, 5vw, 72px);
    align-items: start;
  }
}

/* ---------- 目录 ---------- */

.page-faq .faq-rail {
  min-width: 0;
  border: var(--edge);
  background: var(--faq-rail-bg);
  padding: 18px 16px 20px;
}

@media (min-width: 900px) {
  .page-faq .faq-rail {
    position: sticky;
    top: 84px;
  }
}

.page-faq .faq-rail__title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: var(--fs-1);
  font-weight: 500;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--steel-300);
}

.page-faq .faq-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}

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

.page-faq .faq-rail__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 12px;
  border-left: 2px solid var(--signal-600);
  background: rgba(42, 95, 78, .3);
  color: var(--paper-050);
  text-decoration: none;
  font-size: var(--fs-2);
  line-height: 1.5;
  transition:
    border-color var(--dur) var(--ease),
    background-color var(--dur) var(--ease),
    transform var(--dur) var(--ease);
}

.page-faq .faq-rail__txt {
  white-space: nowrap;
}

.page-faq .faq-rail__no {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--fs-1);
  letter-spacing: .04em;
  color: var(--signal-600);
}

.page-faq .faq-rail__link:hover,
.page-faq .faq-rail__link:focus-visible {
  border-left-color: var(--signal-600);
  background: rgba(255, 90, 31, .14);
  transform: translateX(2px);
}

@media (min-width: 900px) {
  .page-faq .faq-rail__list {
    display: block;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-faq .faq-rail__list li {
    flex: 1 1 auto;
  }

  .page-faq .faq-rail__list li + li {
    margin-top: 6px;
  }

  .page-faq .faq-rail__link {
    width: 100%;
    border-left-color: var(--line-500);
    background: transparent;
    padding: 10px 12px;
  }
}

.page-faq .faq-rail__note {
  margin: 18px 0 0;
  padding-top: 14px;
  border-top: 2px solid var(--line-500);
  font-size: var(--fs-2);
  line-height: 1.75;
  color: var(--steel-300);
}

.page-faq .faq-rail__note a {
  color: var(--paper-050);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 2px;
}

.page-faq .faq-rail__note a:hover {
  color: var(--signal-600);
}

/* ---------- 问答栏 ---------- */

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

.page-faq .faq-group {
  scroll-margin-top: 96px;
}

.page-faq .faq-group + .faq-group {
  margin-top: clamp(36px, 6vw, 64px);
}

.page-faq .faq-group__bar {
  height: 4px;
  margin-bottom: 18px;
  background-image: repeating-linear-gradient(
    90deg,
    var(--line-500) 0 6px,
    transparent 6px 16px
  );
}

.page-faq .faq-group__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 14px;
  margin-bottom: 24px;
  padding-bottom: 14px;
  border-bottom: 2px solid var(--line-500);
}

.page-faq .faq-group__no {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--fs-4);
  font-weight: 700;
  line-height: 1;
  color: var(--signal-600);
}

.page-faq .faq-group__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -.02em;
  line-height: 1.2;
  font-size: clamp(1.4rem, 4.2vw, 1.9rem);
  color: var(--paper-050);
}

.page-faq .faq-group__note {
  flex: 1 1 100%;
  margin: 0;
  font-size: var(--fs-2);
  line-height: 1.7;
  color: var(--steel-300);
}

/* ---------- 图 ---------- */

.page-faq .faq-figure {
  margin: 0 0 26px;
  border: var(--edge);
  background: var(--pitch-700);
}

.page-faq .faq-figure__media {
  overflow: hidden;
}

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

.page-faq .faq-figure__cap {
  border-top: var(--edge);
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: var(--fs-1);
  letter-spacing: .02em;
  line-height: 1.6;
  color: var(--muted-400);
}

/* ---------- 折叠问答 ---------- */

.page-faq .faq-item {
  border: 2px solid var(--line-500);
  background: var(--pitch-900);
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-faq .faq-item + .faq-item {
  margin-top: 10px;
}

.page-faq .faq-item:hover {
  border-color: var(--signal-600);
}

.page-faq .faq-item[open] {
  box-shadow: inset 4px 0 0 0 var(--signal-600);
}

.page-faq .faq-item__q {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  padding: 15px 16px;
  cursor: pointer;
  list-style: none;
  font-size: var(--fs-3);
  font-weight: 700;
  line-height: 1.55;
  color: var(--paper-050);
}

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

.page-faq .faq-item__q::marker {
  content: "";
}

.page-faq .faq-item__icon {
  flex: 0 0 auto;
  position: relative;
  width: 20px;
  height: 20px;
  margin-top: 3px;
  border: 2px solid var(--signal-600);
  transition: background-color var(--dur) var(--ease);
}

.page-faq .faq-item__icon::before,
.page-faq .faq-item__icon::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  background: var(--signal-600);
  transform: translate(-50%, -50%);
  transition: transform var(--dur) var(--ease);
}

.page-faq .faq-item__icon::before {
  width: 10px;
  height: 2px;
}

.page-faq .faq-item__icon::after {
  width: 2px;
  height: 10px;
}

.page-faq .faq-item[open] .faq-item__icon {
  background: rgba(255, 90, 31, .14);
}

.page-faq .faq-item[open] .faq-item__icon::after {
  transform: translate(-50%, -50%) scaleY(0);
}

.page-faq .faq-item__a {
  margin: 0 16px 18px;
  padding-top: 14px;
  border-top: 2px solid var(--line-500);
  max-width: 42rem;
  font-size: var(--fs-3);
  line-height: 1.85;
  color: rgba(244, 247, 245, .88);
}

.page-faq .faq-item__a p {
  margin: 0 0 12px;
}

.page-faq .faq-item__a p:last-of-type {
  margin-bottom: 0;
}

.page-faq .faq-item__a a {
  color: var(--paper-050);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 2px;
}

.page-faq .faq-item__a a:hover {
  color: var(--signal-600);
}

.page-faq .faq-meta {
  display: inline-block;
  margin: 14px 0 0;
  padding: 4px 10px;
  border: 1px solid var(--line-500);
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--fs-1);
  letter-spacing: .04em;
  line-height: 1.6;
  color: var(--steel-300);
}

/* ---------- 收束 ---------- */

.page-faq .faq-outro {
  margin-top: 28px;
  border: var(--edge);
  background: var(--pitch-700);
  padding: 20px 18px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.page-faq .faq-outro__txt {
  margin: 0;
  flex: 1 1 16rem;
  font-size: var(--fs-3);
  line-height: 1.7;
  color: var(--paper-050);
}

.page-faq .faq-outro__acts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

@media (max-width: 600px) {
  .page-faq .faq-item__q {
    padding: 14px 14px;
    font-size: var(--fs-2);
  }

  .page-faq .faq-item__a {
    margin: 0 14px 16px;
    font-size: var(--fs-2);
    line-height: 1.8;
  }

  .page-faq .faq-outro__acts .ps-btn {
    flex: 1 1 auto;
    justify-content: center;
    text-align: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-rail__link,
  .page-faq .faq-item,
  .page-faq .faq-item__icon::before,
  .page-faq .faq-item__icon::after {
    transition: none;
  }

  .page-faq .faq-rail__link:hover,
  .page-faq .faq-rail__link:focus-visible {
    transform: none;
  }
}