.page-faq {
  --faq-hair: rgba(51, 67, 154, 0.46);
  --faq-hair-soft: rgba(51, 67, 154, 0.22);
  --faq-panel: rgba(18, 27, 74, 0.52);
  --faq-panel-lit: rgba(30, 42, 107, 0.72);
  color: var(--text);
}

/* ---------- 面包屑 ---------- */
.page-faq .faq-crumb {
  padding-top: 1.4rem;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  padding-top: clamp(1.6rem, 4vw, 2.6rem);
  padding-bottom: clamp(2.2rem, 5.5vw, 4rem);
  border-bottom: 1px solid var(--faq-hair-soft);
}

.page-faq .faq-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.8rem, 4.5vw, 3.6rem);
  align-items: center;
}

.page-faq h1 {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(1.85rem, 5.6vw, 3.35rem);
  line-height: 1.16;
  letter-spacing: 0.045em;
  margin: 0.9rem 0 0;
  max-width: 17ch;
}

.page-faq .faq-hero__intro {
  margin: 1.25rem 0 0;
  max-width: 46ch;
  font-size: clamp(0.98rem, 1.6vw, 1.0625rem);
  line-height: 1.82;
  color: var(--text-dim);
}

.page-faq .faq-hero__metrics {
  list-style: none;
  margin: 1.9rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--faq-hair-soft);
  border: 1px solid var(--faq-hair-soft);
}

.page-faq .faq-metric {
  background: var(--ink-900);
  padding: 0.95rem 0.85rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.page-faq .faq-metric__num {
  font-size: clamp(1.15rem, 2.6vw, 1.5rem);
  color: var(--amber);
  letter-spacing: 0.04em;
  line-height: 1.1;
}

.page-faq .faq-metric__label {
  font-size: 0.75rem;
  letter-spacing: 0.09em;
  color: var(--text-mute);
  line-height: 1.5;
}

.page-faq .faq-hero__visual {
  position: relative;
  margin: 0;
  aspect-ratio: 25 / 16;
  border: 1px solid var(--faq-hair);
  background:
    linear-gradient(140deg, rgba(34, 211, 238, 0.14), rgba(10, 17, 48, 0) 55%),
    var(--ink-800);
}

.page-faq .faq-hero__visual::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--amber));
}

.page-faq .faq-hero__visual .media__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  margin: 0;
  padding: 1.6rem 1rem 0.85rem;
  font-size: 0.78rem;
  line-height: 1.6;
  color: var(--text-dim);
  background: linear-gradient(180deg, rgba(7, 13, 38, 0), rgba(7, 13, 38, 0.92));
}

/* ---------- 主体两栏 ---------- */
.page-faq .faq-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(2rem, 5vw, 3.4rem);
  padding-top: clamp(2.4rem, 6vw, 4rem);
}

/* 左窄栏 */
.page-faq .faq-rail {
  min-width: 0;
}

.page-faq .faq-rail__title {
  margin: 0 0 0.9rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-faq .faq-rail__nav {
  display: flex;
  gap: 0.4rem;
  overflow-x: auto;
  padding-bottom: 0.5rem;
  scrollbar-width: thin;
}

.page-faq .faq-rail__link {
  flex: none;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 0.85rem;
  border: 1px solid var(--faq-hair);
  background: var(--faq-panel);
  color: var(--text-dim);
  text-decoration: none;
  font-size: 0.9rem;
  letter-spacing: 0.02em;
  transition: border-color 0.22s var(--ease), color 0.22s var(--ease), background-color 0.22s var(--ease);
}

.page-faq .faq-rail__no {
  font-size: 0.72rem;
  color: var(--amber);
  letter-spacing: 0.08em;
}

.page-faq .faq-rail__link:hover,
.page-faq .faq-rail__link:focus-visible {
  border-color: var(--amber);
  color: var(--mist);
  background: var(--faq-panel-lit);
  outline: none;
}

.page-faq .faq-rail__link:focus-visible {
  box-shadow: 0 0 0 2px rgba(255, 159, 28, 0.4);
}

.page-faq .faq-rail__note {
  margin-top: 1.2rem;
  padding: 1rem;
  border: 1px solid var(--faq-hair-soft);
  border-left: 2px solid var(--cyan);
  background: var(--faq-panel);
}

.page-faq .faq-rail__note p {
  margin: 0 0 0.85rem;
  font-size: 0.85rem;
  line-height: 1.7;
  color: var(--text-mute);
}

/* 右宽栏 */
.page-faq .faq-main {
  min-width: 0;
}

.page-faq .faq-cat {
  padding-bottom: clamp(2.2rem, 5vw, 3.4rem);
}

.page-faq .faq-cat + .faq-cat {
  border-top: 1px solid var(--faq-hair-soft);
  padding-top: clamp(2.2rem, 5vw, 3.4rem);
}

.page-faq .faq-cat__head {
  display: grid;
  grid-template-columns: auto 1fr;
  column-gap: 1rem;
  align-items: baseline;
  margin-bottom: 1.6rem;
}

.page-faq .faq-cat__no {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  font-weight: 800;
  line-height: 1;
  color: var(--amber);
  letter-spacing: 0.02em;
  grid-row: 1;
  grid-column: 1;
}

.page-faq .faq-cat__title {
  grid-row: 1;
  grid-column: 2;
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.35rem, 3.2vw, 1.85rem);
  letter-spacing: 0.04em;
  line-height: 1.25;
}

.page-faq .faq-cat__desc {
  grid-row: 2;
  grid-column: 2;
  margin: 0.6rem 0 0;
  max-width: 52ch;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--text-dim);
}

.page-faq .faq-cat__figure {
  margin: 0 0 1.6rem;
  border: 1px solid var(--faq-hair-soft);
  background: var(--ink-800);
}

.page-faq .faq-cat__figure .media__caption {
  margin: 0;
  padding: 0.7rem 0.9rem;
  font-size: 0.78rem;
  line-height: 1.6;
  color: var(--text-mute);
  border-top: 1px solid var(--faq-hair-soft);
}

/* ---------- 折叠问答 ---------- */
.page-faq .faq-cat__items {
  counter-reset: faq;
  border-top: 1px solid var(--faq-hair);
}

.page-faq .faq-item {
  border-bottom: 1px solid var(--faq-hair);
  background: transparent;
  transition: background-color 0.24s var(--ease);
}

.page-faq .faq-item[open] {
  background: linear-gradient(90deg, rgba(30, 42, 107, 0.55), rgba(10, 17, 48, 0));
}

.page-faq .faq-item summary {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.15rem 0.9rem 1.15rem 0;
  cursor: pointer;
  list-style: none;
}

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

.page-faq .faq-item summary:hover .faq-item__q {
  color: var(--mist);
}

.page-faq .faq-item summary:focus-visible {
  outline: none;
  box-shadow: inset 2px 0 0 var(--amber);
}

.page-faq .faq-item__q {
  font-family: var(--font-head);
  font-weight: 600;
  font-size: clamp(1rem, 2vw, 1.1rem);
  line-height: 1.6;
  letter-spacing: 0.015em;
  color: var(--text-dim);
  transition: color 0.22s var(--ease);
}

.page-faq .faq-item__q::before {
  counter-increment: faq;
  content: "Q" counter(faq, decimal-leading-zero);
  display: inline-block;
  margin-right: 0.7rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.9em;
  color: var(--amber);
  letter-spacing: 0.06em;
}

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

.page-faq .faq-item__mark {
  flex: none;
  width: 11px;
  height: 11px;
  margin-top: 0.5rem;
  border-right: 2px solid var(--text-mute);
  border-bottom: 2px solid var(--text-mute);
  transform: rotate(45deg);
  transition: transform 0.26s var(--ease), border-color 0.26s var(--ease);
}

.page-faq .faq-item[open] .faq-item__mark {
  border-color: var(--cyan);
  transform: rotate(-135deg);
}

.page-faq .faq-item__body {
  padding: 0 0.9rem 1.5rem 2.1rem;
  border-left: 2px solid var(--cyan);
  margin-left: 0;
}

.page-faq .faq-item__body p {
  margin: 0 0 0.85rem;
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--text-dim);
}

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

.page-faq .faq-item__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 1.05rem;
}

/* ---------- 底部联络 ---------- */
.page-faq .faq-cta {
  border-top: 1px solid var(--faq-hair);
  background:
    radial-gradient(120% 140% at 0% 0%, rgba(34, 211, 238, 0.14), rgba(10, 17, 48, 0) 58%),
    radial-gradient(110% 130% at 100% 100%, rgba(255, 159, 28, 0.16), rgba(10, 17, 48, 0) 60%),
    var(--ink-850);
}

.page-faq .faq-cta__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.6rem;
  align-items: center;
  border: 1px solid var(--faq-hair);
  padding: clamp(1.5rem, 4vw, 2.6rem);
}

.page-faq .faq-cta__title {
  margin: 0.7rem 0 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.3rem, 3.4vw, 1.9rem);
  letter-spacing: 0.04em;
  line-height: 1.28;
}

.page-faq .faq-cta__text p:last-of-type {
  margin: 0.9rem 0 0;
  max-width: 58ch;
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--text-dim);
}

.page-faq .faq-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

/* ---------- 响应式 ---------- */
@media (min-width: 900px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: 1.12fr 1fr;
    gap: clamp(2rem, 5vw, 4rem);
  }

  .page-faq .faq-cta__inner {
    grid-template-columns: minmax(0, 1.7fr) minmax(0, 1fr);
    gap: 2.4rem;
  }

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

  .page-faq .faq-item summary {
    padding-right: 1.4rem;
  }

  .page-faq .faq-item__body {
    padding-right: 3rem;
  }
}

@media (min-width: 1024px) {
  .page-faq .faq-layout {
    grid-template-columns: 208px minmax(0, 1fr);
    gap: clamp(2.4rem, 4vw, 3.6rem);
  }

  .page-faq .faq-rail {
    position: sticky;
    top: calc(var(--header-h) + 1.8rem);
    align-self: start;
  }

  .page-faq .faq-rail__nav {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    border-top: 1px solid var(--faq-hair-soft);
    padding-bottom: 0;
  }

  .page-faq .faq-rail__link {
    border: 0;
    border-bottom: 1px solid var(--faq-hair-soft);
    border-left: 2px solid transparent;
    background: transparent;
    padding: 0.85rem 0.6rem 0.85rem 0.9rem;
    justify-content: flex-start;
    width: 100%;
  }

  .page-faq .faq-rail__link:hover,
  .page-faq .faq-rail__link:focus-visible {
    background: var(--faq-panel);
    border-left-color: var(--amber);
    border-bottom-color: var(--faq-hair-soft);
  }
}

@media (min-width: 1240px) {
  .page-faq .faq-cat__head {
    grid-template-columns: 76px 1fr;
  }

  .page-faq .faq-item summary {
    padding-top: 1.3rem;
    padding-bottom: 1.3rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item__mark,
  .page-faq .faq-item__q,
  .page-faq .faq-rail__link {
    transition: none;
  }
}