.page-faq {
  --faq-rule: 2px solid var(--ink);
  --faq-gap: clamp(20px, 4vw, 40px);
  background: var(--mist);
  color: var(--ink);
}

.page-faq .breadcrumb {
  padding-top: clamp(16px, 2.4vw, 26px);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  padding: clamp(18px, 3vw, 34px) 0 clamp(30px, 4.5vw, 58px);
  border-bottom: var(--hair);
}

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

.page-faq .faq-hero h1 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-stretch: condensed;
  font-weight: 200;
  font-size: clamp(2.5rem, 6.2vw, 5.2rem);
  line-height: 0.98;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-faq .faq-hero .lede {
  max-width: 46ch;
  margin: 20px 0 0;
  font-size: clamp(1rem, 1.2vw, 1.0625rem);
  line-height: 1.85;
  color: var(--slate);
}

.page-faq .faq-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: clamp(24px, 3vw, 34px);
  border-top: var(--hair);
  border-bottom: var(--hair);
}

.page-faq .faq-stat {
  padding: 16px 12px 16px 0;
  min-width: 0;
}

.page-faq .faq-stat + .faq-stat {
  padding-left: 14px;
  border-left: var(--hair);
}

.page-faq .faq-stat__num {
  display: block;
  font-family: var(--font-display);
  font-stretch: condensed;
  font-weight: 200;
  font-size: clamp(2rem, 4.6vw, 3.2rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-faq .faq-stat__label {
  display: block;
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--steel);
}

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

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

.page-faq .faq-hero__media .media__img {
  aspect-ratio: 3 / 2;
}

/* ---------- 主体：索引 + 问答 ---------- */
.page-faq .faq-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 44px);
  padding-top: clamp(32px, 4.5vw, 60px);
  padding-bottom: clamp(36px, 5vw, 72px);
}

.page-faq .faq-index {
  border-top: var(--faq-rule);
  padding-top: 14px;
}

.page-faq .faq-index__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--steel);
}

.page-faq .faq-index__list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-index__link {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 12px 4px 12px 0;
  border-bottom: var(--hair);
  font-size: 15px;
  color: var(--slate);
  text-decoration: none;
  transition: color 180ms var(--ease), transform 180ms var(--ease);
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  color: var(--ink);
  transform: translateX(4px);
}

.page-faq .faq-index__num {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--steel);
}

.page-faq .faq-index__link--plain {
  color: var(--steel);
}

.page-faq .faq-index__note {
  margin: 16px 0 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--steel);
  max-width: 30ch;
}

/* ---------- 问答分组 ---------- */
.page-faq .faq-group {
  margin-bottom: clamp(38px, 5vw, 60px);
  scroll-margin-top: calc(var(--band-h) + 24px);
}

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

.page-faq .faq-group__head {
  padding-bottom: 14px;
  border-bottom: var(--faq-rule);
}

.page-faq .faq-group__title {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin: 0;
  font-family: var(--font-display);
  font-stretch: condensed;
  font-weight: 300;
  font-size: clamp(1.55rem, 2.6vw, 2.15rem);
  line-height: 1.05;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-faq .faq-group__num {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--steel);
  flex: 0 0 auto;
}

.page-faq .faq-group__desc {
  margin: 10px 0 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--steel);
}

/* ---------- 折叠问答 ---------- */
.page-faq .qa {
  border-bottom: var(--hair);
  border-left: 2px solid transparent;
  padding-left: 14px;
  background: transparent;
  transition: background-color 180ms var(--ease), border-color 180ms var(--ease);
}

.page-faq .qa[open] {
  border-left-color: var(--maple);
  background: rgba(230, 232, 227, 0.55);
}

.page-faq .qa__q {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
  padding: 17px 14px 17px 0;
  list-style: none;
  cursor: pointer;
  font-size: 16.5px;
  font-weight: 500;
  line-height: 1.55;
  color: var(--ink);
}

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

.page-faq .qa__q::after {
  content: "";
  flex: 0 0 auto;
  width: 10px;
  height: 10px;
  margin-top: 7px;
  border-right: 1.5px solid var(--steel);
  border-bottom: 1.5px solid var(--steel);
  transform: rotate(45deg);
  transition: transform 200ms var(--ease), border-color 200ms var(--ease);
}

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

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

.page-faq .qa__a {
  padding: 0 20px 20px 2px;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--slate);
}

.page-faq .qa__a p {
  margin: 0;
  max-width: 64ch;
}

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

.page-faq .qa__a a {
  color: var(--slate);
  text-decoration: underline;
  text-decoration-color: var(--line);
  text-underline-offset: 3px;
  transition: color 160ms var(--ease), text-decoration-color 160ms var(--ease);
}

.page-faq .qa__a a:hover,
.page-faq .qa__a a:focus-visible {
  color: var(--maple-deep);
  text-decoration-color: var(--maple);
}

/* ---------- 联系支持 ---------- */
.page-faq .faq-support {
  background: var(--paper);
  border-top: var(--hair);
  border-bottom: var(--hair);
  padding: clamp(32px, 5vw, 64px) 0;
  scroll-margin-top: calc(var(--band-h) + 24px);
}

.page-faq .faq-support__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 48px);
  align-items: center;
}

.page-faq .faq-support h2 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-stretch: condensed;
  font-weight: 300;
  font-size: clamp(1.75rem, 3.2vw, 2.6rem);
  line-height: 1.05;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-faq .faq-support__intro {
  margin: 16px 0 0;
  max-width: 52ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--slate);
}

.page-faq .faq-support__list {
  margin: 22px 0 26px;
  padding: 0;
  border-top: var(--hair);
}

.page-faq .faq-support__row {
  display: grid;
  grid-template-columns: 76px minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
  padding: 12px 0;
  border-bottom: var(--hair);
}

.page-faq .faq-support__row dt {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--steel);
}

.page-faq .faq-support__row dd {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.7;
  color: var(--ink);
  word-break: break-word;
}

.page-faq .faq-support__row dd a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-support__row dd a:hover,
.page-faq .faq-support__row dd a:focus-visible {
  border-bottom-color: var(--maple);
}

.page-faq .faq-support .copy-btn {
  margin-left: 8px;
  padding: 3px 9px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--steel);
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 0;
  cursor: pointer;
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}

.page-faq .faq-support .copy-btn:hover,
.page-faq .faq-support .copy-btn:focus-visible {
  color: var(--ink);
  border-color: var(--steel);
}

.page-faq .faq-support .copy-btn.is-copied {
  color: var(--maple-deep);
  border-color: var(--maple);
}

.page-faq .faq-support__media .media__img {
  aspect-ratio: 2 / 1;
}

/* ---------- 断点 ---------- */
@media (min-width: 900px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(32px, 4vw, 64px);
  }

  .page-faq .faq-hero__media {
    align-self: end;
  }

  .page-faq .faq-body {
    grid-template-columns: 232px minmax(0, 1fr);
    gap: clamp(36px, 5vw, 76px);
    align-items: start;
  }

  .page-faq .faq-index {
    position: sticky;
    top: calc(var(--band-h) + 28px);
  }

  .page-faq .faq-support__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
  }
}

@media (min-width: 1180px) {
  .page-faq .faq-index__link {
    font-size: 15.5px;
  }
}

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

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