.page-faq {
  background-color: var(--ink-900);
  color: var(--paper);
  font-family: var(--font-sans);
  overflow-x: hidden;
}

.page-faq .faq-crumb {
  padding-top: clamp(14px, 2.6vw, 26px);
}

/* ---------- 首屏：对角切割 + 蓝图网格 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(36px, 7vw, 92px) 0 clamp(38px, 6vw, 78px);
  background-image: linear-gradient(158deg, var(--ink-800) 0%, var(--ink-900) 68%);
  border-bottom: 1px solid var(--hair-soft);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: linear-gradient(18deg, transparent 53.4%, rgba(31, 224, 208, .09) 53.4%, rgba(31, 224, 208, .09) 54.4%, transparent 54.4%);
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: .5;
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 80px 80px;
}

.page-faq .faq-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 48px);
}

.page-faq .faq-hero__title {
  margin: .35em 0 .6em;
  font-family: var(--font-narrow);
  font-size: clamp(28px, 5.4vw, 52px);
  font-weight: 800;
  line-height: 1.14;
  letter-spacing: .01em;
  color: var(--paper);
  max-width: 20ch;
}

.page-faq .faq-hero__panel {
  background-color: rgba(18, 59, 94, .55);
  border: 1px solid var(--hair-soft);
  border-left: 2px solid var(--cyan);
  padding: 20px 22px;
  backdrop-filter: blur(2px);
}

.page-faq .faq-quick {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-faq .faq-quick li {
  border-top: 1px solid var(--hair-soft);
  padding: 10px 0;
  font-size: 15px;
  line-height: 1.6;
}

.page-faq .faq-hero__note {
  margin: 16px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--muted);
}

/* ---------- 主体：索引 + 展开面板 ---------- */
.page-faq .faq-main {
  padding-top: clamp(34px, 5vw, 64px);
  padding-bottom: clamp(44px, 7vw, 96px);
}

.page-faq .faq-shell {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 56px);
}

.page-faq .faq-rail {
  border-top: 1px solid var(--hair);
  padding-top: 16px;
}

.page-faq .faq-rail__title {
  margin: 0 0 14px;
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--muted);
}

.page-faq .faq-index {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
}

.page-faq .faq-index__item a {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 12px;
  align-items: baseline;
  padding: 10px 6px 10px 0;
  border-bottom: 1px solid var(--hair-soft);
  color: var(--muted);
  text-decoration: none;
  font-size: 14px;
  line-height: 1.55;
  transition: color var(--dur) var(--ease), padding-left var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-faq .faq-index__item a:hover,
.page-faq .faq-index__item a:focus-visible {
  color: var(--cyan);
  padding-left: 8px;
  border-bottom-color: var(--cyan);
}

.page-faq .faq-index__num {
  font-size: 12px;
  color: var(--orange);
}

.page-faq .faq-group + .faq-group {
  margin-top: clamp(38px, 6vw, 78px);
}

.page-faq .faq-group__head {
  display: grid;
  gap: 6px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--hair);
}

.page-faq .faq-group__title {
  margin: 0;
  font-family: var(--font-narrow);
  font-size: clamp(19px, 2.6vw, 27px);
  font-weight: 800;
  letter-spacing: .06em;
  color: var(--paper);
}

.page-faq .faq-group__title::before {
  content: "";
  display: inline-block;
  width: 18px;
  height: 2px;
  margin-right: 10px;
  vertical-align: middle;
  background-color: var(--orange);
}

.page-faq .faq-group__note {
  margin: 0;
  font-size: 14px;
  color: var(--muted);
}

/* 折叠面板 */
.page-faq .faq-item {
  position: relative;
  border-bottom: 1px solid var(--hair-soft);
  background-color: transparent;
  transition: background-color var(--dur) var(--ease);
}

.page-faq .faq-item[open] {
  background-color: rgba(31, 224, 208, .05);
  background-image:
    linear-gradient(rgba(60, 90, 115, .16) 1px, transparent 1px),
    linear-gradient(90deg, rgba(60, 90, 115, .16) 1px, transparent 1px);
  background-size: 80px 80px;
  box-shadow: inset 2px 0 0 var(--cyan);
}

.page-faq .faq-item__summary {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 20px 6px;
  cursor: pointer;
  list-style: none;
}

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

.page-faq .faq-item[open] .faq-item__summary {
  padding-bottom: 10px;
}

.page-faq .faq-item__num {
  flex: 0 0 auto;
  padding-top: 5px;
  font-size: 12px;
  color: var(--muted);
  transition: color var(--dur) var(--ease);
}

.page-faq .faq-item[open] .faq-item__num {
  color: var(--orange);
}

.page-faq .faq-item__q {
  flex: 1 1 auto;
  font-size: clamp(16px, 2vw, 19px);
  font-weight: 700;
  line-height: 1.5;
  color: var(--paper);
}

.page-faq .faq-item__mark {
  position: relative;
  flex: 0 0 auto;
  width: 16px;
  height: 16px;
  margin-top: 7px;
}

.page-faq .faq-item__mark::before,
.page-faq .faq-item__mark::after {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 16px;
  height: 1px;
  background-color: var(--cyan);
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}

.page-faq .faq-item__mark::after {
  transform: rotate(90deg);
}

.page-faq .faq-item[open] .faq-item__mark::after {
  transform: rotate(0deg);
  opacity: 0;
}

.page-faq .faq-item__body {
  display: grid;
  gap: 10px;
  padding: 0 6px 26px 40px;
}

.page-faq .faq-item__answer {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--paper);
}

.page-faq .faq-item__answer:first-child {
  color: var(--glow);
}

.page-faq .faq-fields {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 6px 0 0;
  padding: 0;
}

.page-faq .faq-field {
  padding: 4px 9px;
  border: 1px solid var(--hair-soft);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--muted);
}

/* 图文 */
.page-faq .faq-figure {
  margin: clamp(24px, 4vw, 42px) 0 0;
  border: 1px solid var(--hair-soft);
  background-color: var(--ink-800);
}

.page-faq .faq-figure .media__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.85) contrast(1.05);
}

.page-faq .faq-figure .media__coord {
  display: block;
  padding: 10px 14px 0;
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--orange);
}

.page-faq .faq-figure .media__caption {
  display: block;
  padding: 8px 14px 14px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

/* 收尾 */
.page-faq .faq-cta {
  border-top: 1px solid var(--hair);
  background-image: linear-gradient(20deg, var(--ink-800) 0%, var(--ink-900) 72%);
}

.page-faq .faq-cta__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.page-faq .faq-cta__title {
  margin: 0 0 8px;
  font-family: var(--font-narrow);
  font-size: clamp(21px, 3vw, 32px);
  font-weight: 800;
  letter-spacing: .04em;
  color: var(--paper);
}

.page-faq .faq-cta__text {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

.page-faq .faq-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 窄屏 ---------- */
@media (max-width: 600px) {
  .page-faq .faq-item__body {
    padding-left: 6px;
  }

  .page-faq .faq-item__q {
    font-size: 16px;
  }

  .page-faq .faq-hero__panel {
    padding: 16px 16px;
  }
}

/* ---------- 平板及以上 ---------- */
@media (min-width: 760px) {
  .page-faq .faq-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
  }

  .page-faq .faq-cta__actions {
    justify-content: flex-end;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(290px, .85fr);
    align-items: end;
  }
}

@media (min-width: 960px) {
  .page-faq .faq-shell {
    grid-template-columns: 262px minmax(0, 1fr);
    align-items: start;
  }

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

  .page-faq .faq-item__body {
    padding-right: 48px;
  }
}