.page-faq {
  --faq-cell: #16283C;
  --faq-cell-head: #101E2E;
  --faq-cell-hover: #1B3346;
  --faq-gap: 20px;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-intro {
  padding: clamp(88px, 12vw, 136px) 0 clamp(36px, 5vw, 56px);
}

.page-faq .faq-intro__grid {
  display: grid;
  gap: 18px;
  margin-top: clamp(28px, 5vw, 52px);
}

.page-faq .faq-intro__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(32px, 6.4vw, 64px);
  line-height: 1.08;
  letter-spacing: 0.03em;
  color: var(--white);
  max-width: 17ch;
}

.page-faq .faq-intro__lead {
  margin: 0;
  max-width: 62ch;
  font-size: 17px;
  line-height: 1.85;
  color: var(--muted);
}

.page-faq .faq-jump {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-faq .faq-jump a {
  display: block;
  padding: 8px 12px;
  border: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
  text-decoration: none;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-faq .faq-jump a:hover,
.page-faq .faq-jump a:focus-visible {
  color: var(--ink-900);
  background-color: var(--teal);
  border-color: var(--teal);
}

/* ---------- 权益对照 ---------- */
.page-faq .faq-tier {
  padding-top: clamp(36px, 5vw, 56px);
}

.page-faq .faq-tier__figure {
  margin: 0 0 clamp(28px, 4vw, 48px);
}

.page-faq .faq-tier__head {
  margin-bottom: clamp(24px, 3.5vw, 36px);
}

.page-faq .tier-scroll {
  overflow-x: auto;
  background-color: var(--faq-cell);
  border: 1px solid var(--line);
  -webkit-overflow-scrolling: touch;
}

.page-faq .tier-scroll:focus-visible {
  outline: 2px solid var(--teal);
  outline-offset: 2px;
}

.page-faq .tier-table {
  width: 100%;
  min-width: 760px;
  border-collapse: collapse;
  font-size: 15px;
}

.page-faq .tier-table__caption {
  caption-side: top;
  text-align: left;
  padding: 12px 18px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--muted);
  border-bottom: 1px solid var(--line);
}

.page-faq .tier-table th,
.page-faq .tier-table td {
  padding: 16px 18px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line);
  line-height: 1.7;
}

.page-faq .tier-table thead th {
  font-family: var(--font-mono);
  font-weight: 400;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--white);
  background-color: var(--faq-cell-head);
  border-bottom: 1px solid var(--line);
  white-space: nowrap;
}

.page-faq .tier-table__name {
  display: block;
  font-size: 14px;
  letter-spacing: 0.04em;
}

.page-faq .tier-table__sub {
  display: block;
  margin-top: 4px;
  font-size: 11px;
  color: var(--muted);
  letter-spacing: 0.06em;
}

.page-faq .tier-table tbody th[scope="row"] {
  position: sticky;
  left: 0;
  z-index: 2;
  width: 150px;
  min-width: 150px;
  background-color: var(--faq-cell);
  border-right: 1px solid var(--line);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 14px;
  color: var(--teal-soft);
}

.page-faq .tier-table thead th:first-child {
  position: sticky;
  left: 0;
  z-index: 3;
  width: 150px;
  min-width: 150px;
  background-color: var(--faq-cell-head);
  border-right: 1px solid var(--line);
  color: var(--muted);
}

.page-faq .tier-table tbody td {
  color: var(--white);
}

.page-faq .tier-table tbody tr:hover td,
.page-faq .tier-table tbody tr:hover th[scope="row"] {
  background-color: var(--faq-cell-hover);
}

.page-faq .tier-table tbody tr:hover th[scope="row"] {
  color: var(--teal);
}

.page-faq .faq-tier__note {
  margin: 20px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
  max-width: 72ch;
}

.page-faq .faq-tier__note .more-link {
  margin-left: 4px;
}

/* ---------- 问答分组 ---------- */
.page-faq .faq-group__grid {
  display: grid;
  gap: 20px;
}

.page-faq .faq-group__aside {
  display: flex;
  align-items: baseline;
  gap: 12px;
  border-bottom: 1px solid var(--line);
  padding-bottom: 12px;
}

.page-faq .faq-group__letter {
  font-family: var(--font-mono);
  font-size: 34px;
  line-height: 1;
  color: var(--teal);
  letter-spacing: 0.02em;
}

.page-faq .faq-group__label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-faq .faq-group__title {
  margin: 0 0 12px;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(24px, 3vw, 34px);
  line-height: 1.3;
  color: var(--white);
}

.page-faq .faq-group__desc {
  margin: 0 0 18px;
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--muted);
}

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

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

.page-faq .qa__q {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 18px 0;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 600;
  line-height: 1.55;
  color: var(--white);
  transition: color var(--dur) var(--ease);
}

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

.page-faq .qa__q:hover {
  color: var(--teal-soft);
}

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

.page-faq .qa__num {
  flex: 0 0 auto;
  width: 32px;
  padding-top: 5px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--teal);
}

.page-faq .qa__mark {
  position: relative;
  flex: 0 0 auto;
  width: 14px;
  height: 14px;
  margin-left: auto;
  margin-top: 6px;
}

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

.page-faq .qa__mark::before {
  top: 50%;
  left: 0;
  width: 14px;
  height: 1px;
  transform: translateY(-50%);
}

.page-faq .qa__mark::after {
  left: 50%;
  top: 0;
  width: 1px;
  height: 14px;
  transform: translateX(-50%);
}

.page-faq .qa[open] .qa__mark::after {
  transform: translateX(-50%) scaleY(0);
}

.page-faq .qa[open] .qa__q {
  color: var(--teal-soft);
}

.page-faq .qa__a {
  padding: 0 0 24px;
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--muted);
}

.page-faq .qa__a p {
  margin: 0;
}

.page-faq .qa__a .more-link {
  margin: 0 2px;
}

/* ---------- 人工支持 ---------- */
.page-faq .faq-support__grid {
  display: grid;
  gap: 28px;
}

.page-faq .faq-support__title {
  margin: 12px 0 14px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(26px, 4vw, 44px);
  line-height: 1.16;
  letter-spacing: 0.02em;
  color: var(--white);
  max-width: 18ch;
}

.page-faq .faq-support__lead {
  margin: 0 0 24px;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--muted);
}

.page-faq .faq-support__list {
  margin: 0 0 26px;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-faq .faq-support__item {
  display: grid;
  gap: 4px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-support__item dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--muted);
}

.page-faq .faq-support__item dd {
  margin: 0;
}

.page-faq .faq-support__mono {
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: 0.02em;
  color: var(--white);
  word-break: break-word;
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-faq .faq-support__item {
    grid-template-columns: 128px minmax(0, 1fr);
    align-items: baseline;
    gap: 16px;
  }

  .page-faq .qa__a {
    padding-left: 46px;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-intro__grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 22px 24px;
  }

  .page-faq .faq-intro__grid > .kicker {
    grid-column: 1 / 7;
  }

  .page-faq .faq-intro__title {
    grid-column: 1 / 11;
  }

  .page-faq .faq-intro__lead {
    grid-column: 1 / 9;
  }

  .page-faq .faq-jump {
    grid-column: 1 / 12;
  }

  .page-faq .faq-group__grid {
    grid-template-columns: 92px minmax(0, 1fr);
    gap: 48px;
  }

  .page-faq .faq-group__aside {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    border-bottom: 0;
    border-left: 1px solid var(--line);
    padding: 0 0 0 16px;
    position: sticky;
    top: 108px;
  }

  .page-faq .faq-support__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 64px;
    align-items: start;
  }

  .page-faq .faq-support__media {
    margin-top: 44px;
  }
}

@media (min-width: 1180px) {
  .page-faq .faq-intro__lead {
    grid-column: 1 / 8;
  }

  .page-faq .faq-group__grid {
    grid-template-columns: 110px minmax(0, 1fr);
    gap: 64px;
  }
}

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