.page-faq {
  --faq-gap: 20px;
  --faq-panel: #ffffff;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  padding-top: clamp(96px, 14vw, 168px);
  padding-bottom: clamp(56px, 9vw, 104px);
}

.page-faq .faq-hero__grid {
  display: grid;
  gap: 36px;
  margin-top: 26px;
}

.page-faq .faq-hero__copy .eyebrow {
  margin-bottom: 16px;
}

.page-faq .faq-hero__copy h1 {
  font-size: clamp(34px, 6.2vw, 66px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  margin: 0 0 20px;
  color: var(--text-on-dark);
}

.page-faq .faq-hero__copy .section-lede {
  max-width: 42ch;
  color: var(--text-dim);
  font-size: 17px;
  line-height: 1.85;
  margin: 0 0 28px;
}

.page-faq .faq-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 32px;
}

.page-faq .faq-hero__facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 16px;
  border-top: 1px solid var(--line-soft);
  padding-top: 22px;
}

.page-faq .faq-hero__facts li {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-faq .faq-fact__value {
  font-family: var(--font-mono);
  font-size: clamp(18px, 2.6vw, 24px);
  letter-spacing: 0.02em;
  color: var(--flame-300);
}

.page-faq .faq-fact__label {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--text-dim);
}

.page-faq .faq-hero__figure {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--ink-700);
}

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

/* ---------- 双栏主体 ---------- */
.page-faq .faq-layout {
  display: grid;
  gap: 32px;
}

.page-faq .faq-rail {
  position: relative;
}

.page-faq .faq-rail__title {
  font-size: 13px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--graphite);
  margin: 0 0 14px;
}

.page-faq .faq-rail__list {
  list-style: none;
  margin: 0 0 18px;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-faq .faq-rail__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 15px;
  border: 1px solid var(--mist-line);
  border-radius: var(--radius-pill);
  background: var(--faq-panel);
  color: var(--ink-text);
  font-size: 14px;
  text-decoration: none;
  white-space: nowrap;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-faq .faq-rail__link::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--jade-500);
  flex: none;
}

.page-faq .faq-rail__link:hover,
.page-faq .faq-rail__link:focus-visible {
  border-color: var(--flame-500);
  color: var(--flame-500);
}

.page-faq .faq-rail__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--graphite);
}

.page-faq .faq-rail__note {
  font-size: 13px;
  line-height: 1.8;
  color: var(--graphite);
  margin: 0;
}

/* ---------- 问答组 ---------- */
.page-faq .faq-flow {
  display: flex;
  flex-direction: column;
  gap: clamp(40px, 6vw, 72px);
  min-width: 0;
}

.page-faq .faq-group {
  scroll-margin-top: calc(var(--header-h) + 24px);
  min-width: 0;
}

.page-faq .faq-group__head {
  border-bottom: 1px solid var(--mist-line);
  padding-bottom: 18px;
  margin-bottom: 22px;
}

.page-faq .faq-group__head h2 {
  font-size: clamp(22px, 3.6vw, 34px);
  line-height: 1.24;
  letter-spacing: -0.01em;
  color: var(--ink-text);
  margin: 10px 0 10px;
}

.page-faq .faq-group__lede {
  max-width: 46ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--graphite);
  margin: 0;
}

.page-faq .faq-group__split {
  display: grid;
  gap: 28px;
}

.page-faq .faq-group__figure {
  margin: 0;
}

.page-faq .faq-group__figure img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
  border: 1px solid var(--mist-line);
}

.page-faq .faq-group__figure .media__caption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--graphite);
}

/* ---------- 折叠问答 ---------- */
.page-faq .qa-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.page-faq .qa {
  position: relative;
  background: var(--faq-panel);
  border: 1px solid var(--mist-line);
  border-radius: var(--radius-lg);
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-faq .qa::before {
  content: "";
  position: absolute;
  left: 0;
  top: 16px;
  bottom: 16px;
  width: 3px;
  border-radius: 3px;
  background: var(--flame-500);
  opacity: 0;
  transition: opacity var(--dur) var(--ease);
}

.page-faq .qa[open] {
  border-color: var(--flame-300);
}

.page-faq .qa[open]::before {
  opacity: 1;
}

.page-faq .qa:hover {
  border-color: var(--line-soft);
}

.page-faq .qa summary {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 18px 20px 18px 24px;
  cursor: pointer;
  list-style: none;
  border-radius: var(--radius-lg);
}

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

.page-faq .qa summary:focus-visible {
  outline: 2px solid var(--flame-500);
  outline-offset: 2px;
}

.page-faq .qa__num {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--jade-700);
  padding-top: 3px;
  flex: none;
}

.page-faq .qa__title {
  flex: 1 1 auto;
  font-size: 16.5px;
  font-weight: 600;
  line-height: 1.62;
  color: var(--ink-text);
}

.page-faq .qa__mark {
  position: relative;
  width: 16px;
  height: 16px;
  flex: none;
  margin-top: 5px;
}

.page-faq .qa__mark::before,
.page-faq .qa__mark::after {
  content: "";
  position: absolute;
  background: var(--graphite);
  transition: transform var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-faq .qa__mark::before {
  left: 0;
  top: 7px;
  width: 16px;
  height: 2px;
}

.page-faq .qa__mark::after {
  left: 7px;
  top: 0;
  width: 2px;
  height: 16px;
}

.page-faq .qa[open] .qa__mark::before {
  background: var(--flame-500);
}

.page-faq .qa[open] .qa__mark::after {
  transform: scaleY(0);
  background: var(--flame-500);
}

.page-faq .qa:hover .qa__mark::before,
.page-faq .qa:hover .qa__mark::after {
  background: var(--flame-500);
}

.page-faq .qa__body {
  padding: 0 22px 20px 54px;
}

.page-faq .qa__body p {
  margin: 0;
  font-size: 16px;
  line-height: 1.9;
  color: var(--ink-text);
  max-width: 46ch;
}

/* ---------- 收尾说明 ---------- */
.page-faq .faq-close {
  background: var(--ink-800);
  color: var(--text-on-dark);
}

.page-faq .faq-close__inner {
  display: grid;
  gap: 32px;
}

.page-faq .faq-close__text h2 {
  font-size: clamp(24px, 4vw, 38px);
  line-height: 1.2;
  letter-spacing: -0.015em;
  margin: 12px 0 20px;
  color: var(--text-on-dark);
}

.page-faq .faq-close__text p {
  font-size: 16px;
  line-height: 1.9;
  color: var(--text-dim);
  max-width: 52ch;
  margin: 0 0 16px;
}

.page-faq .faq-close__text .link-inline {
  color: var(--jade-500);
}

.page-faq .faq-close__text .link-inline:hover {
  color: var(--flame-300);
}

.page-faq .faq-close__panel {
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  padding: 24px;
  background: var(--ink-700);
}

.page-faq .faq-close__key {
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--graphite);
  margin: 0 0 4px;
}

.page-faq .faq-close__value {
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: 0.02em;
  color: var(--text-on-dark);
  margin: 0 0 18px;
  word-break: break-word;
}

.page-faq .faq-close__panel .btn {
  margin-top: 4px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-faq .faq-group__split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 300px);
    align-items: start;
  }

  .page-faq .faq-close__inner {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    align-items: start;
  }
}

@media (min-width: 960px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: center;
    gap: 56px;
  }
}

@media (min-width: 1024px) {
  .page-faq .faq-layout {
    grid-template-columns: 264px minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: calc(var(--header-h-compact) + 28px);
  }

  .page-faq .faq-rail__list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 6px;
  }

  .page-faq .faq-rail__link {
    width: 100%;
    justify-content: flex-start;
    padding: 10px 14px;
    border-color: transparent;
    border-radius: var(--radius-md);
    background: transparent;
  }

  .page-faq .faq-rail__link:hover,
  .page-faq .faq-rail__link:focus-visible {
    background: var(--faq-panel);
    border-color: var(--flame-500);
  }

  .page-faq .qa__body {
    padding-left: 60px;
  }
}

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

  .page-faq .qa[open] .qa__mark::after {
    transform: none;
    opacity: 0;
  }
}