.page-faq {
  --faq-rail: 288px;
  --faq-pad: clamp(15px, 2.4vw, 24px);
  padding-block: clamp(18px, 3.6vw, 34px) clamp(56px, 9vw, 104px);
}

/* ---------- 页头 ---------- */

.page-faq .faq-head {
  position: relative;
  display: grid;
  gap: 14px;
  padding-bottom: clamp(20px, 3vw, 30px);
  border-bottom: 1px solid var(--ink-line);
  margin-bottom: clamp(28px, 4.5vw, 48px);
}

.page-faq .faq-head::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 104px;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), rgba(0, 229, 255, 0));
  pointer-events: none;
}

.page-faq .faq-metrics {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 30px;
  margin: 6px 0 0;
  padding: 0;
}

.page-faq .faq-metrics li {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.page-faq .faq-metrics__num {
  font-size: var(--step-5);
  font-weight: 700;
  color: var(--cyan);
  letter-spacing: -0.02em;
  line-height: 1.1;
}

.page-faq .faq-metrics__label {
  font-size: var(--step-2);
  color: var(--muted);
}

/* ---------- 两栏骨架 ---------- */

.page-faq .faq-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4.5vw, 52px);
}

.page-faq .faq-index {
  display: grid;
  gap: 18px;
  align-content: start;
}

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

.page-faq .faq-index__label {
  margin: 0 0 10px;
  font-family: var(--font-serif);
  font-size: var(--step-2);
  letter-spacing: 0.08em;
  color: var(--muted);
}

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

.page-faq .faq-index__item + .faq-index__item {
  margin-top: 6px;
}

.page-faq .faq-index__link {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 11px 12px 11px 14px;
  text-decoration: none;
  color: var(--text-soft);
  background: linear-gradient(90deg, rgba(18, 41, 79, 0.72), rgba(11, 27, 58, 0.35));
  border-left: 2px solid var(--ink-line);
  transition: border-color 0.25s var(--ease), background-color 0.25s var(--ease), transform 0.3s var(--ease);
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  border-left-color: var(--cyan);
  color: var(--text);
  transform: translateX(3px);
}

.page-faq .faq-index__num {
  font-size: var(--step-2);
  font-weight: 700;
  color: var(--cyan-soft);
  line-height: 1.5;
  flex: 0 0 auto;
}

.page-faq .faq-index__text {
  display: grid;
  gap: 3px;
  min-width: 0;
}

.page-faq .faq-index__name {
  font-family: var(--font-serif);
  font-size: var(--step-3);
  color: var(--text);
  line-height: 1.35;
}

.page-faq .faq-index__desc {
  font-size: var(--step-1);
  line-height: 1.6;
  color: var(--muted);
}

.page-faq .faq-index__note {
  margin: 0;
  padding-top: 12px;
  border-top: 1px solid var(--ink-line);
  font-size: var(--step-1);
  line-height: 1.7;
  color: var(--muted-deep);
}

/* ---------- 分组 ---------- */

.page-faq .faq-group {
  scroll-margin-top: 104px;
  margin-bottom: clamp(30px, 4.6vw, 52px);
}

.page-faq .faq-group__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding-bottom: 12px;
  margin-bottom: 14px;
  border-bottom: 1px solid var(--ink-line);
}

.page-faq .faq-group__index {
  font-family: var(--font-serif);
  font-size: var(--step-5);
  line-height: 1;
  color: var(--cyan-soft);
  letter-spacing: 0.02em;
}

.page-faq .faq-group__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: var(--step-5);
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--text);
}

.page-faq .faq-group__note {
  margin: 5px 0 0;
  font-size: var(--step-2);
  line-height: 1.6;
  color: var(--muted);
}

.page-faq .faq-group__items {
  display: grid;
  gap: 10px;
}

.page-faq .faq-figure {
  margin: 0 0 16px;
}

/* ---------- 折叠问答卡 ---------- */

.page-faq .faq-item {
  position: relative;
  background: var(--space-navy);
  border: 1px solid var(--ink-line);
  border-left: 3px solid var(--ink-line);
  transition: border-color 0.25s var(--ease), background-color 0.25s var(--ease);
}

.page-faq .faq-item::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: 16px;
  height: 16px;
  background: linear-gradient(135deg, transparent 50%, var(--ink-line) 50%);
  opacity: 0.55;
  pointer-events: none;
  transition: opacity 0.25s var(--ease);
}

.page-faq .faq-item:hover {
  border-color: rgba(0, 229, 255, 0.42);
}

.page-faq .faq-item[open] {
  background: var(--navy-raised);
  border-color: var(--cyan);
}

.page-faq .faq-item[open]::after {
  opacity: 1;
  background: linear-gradient(135deg, transparent 50%, rgba(0, 229, 255, 0.45) 50%);
}

.page-faq .faq-item__summary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 15px var(--faq-pad);
  cursor: pointer;
  list-style: none;
  color: var(--text);
  transition: color 0.2s var(--ease);
}

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

.page-faq .faq-item__summary::marker {
  content: "";
}

.page-faq .faq-item__summary::after {
  content: "";
  margin-left: auto;
  align-self: center;
  flex: 0 0 auto;
  width: 9px;
  height: 9px;
  border-right: 2px solid var(--cyan);
  border-bottom: 2px solid var(--cyan);
  transform: rotate(45deg) translate(-2px, -2px);
  transition: transform 0.28s var(--ease);
}

.page-faq .faq-item[open] .faq-item__summary::after {
  transform: rotate(-135deg) translate(-2px, -2px);
}

.page-faq .faq-item__no {
  flex: 0 0 auto;
  align-self: center;
  font-size: var(--step-1);
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--muted-deep);
  border: 1px solid var(--ink-line);
  padding: 2px 6px;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-faq .faq-item[open] .faq-item__no {
  color: var(--cyan);
  border-color: rgba(0, 229, 255, 0.5);
}

.page-faq .faq-item__q {
  font-size: var(--step-3);
  font-weight: 500;
  line-height: 1.55;
  min-width: 0;
}

.page-faq .faq-item__body {
  padding: 14px var(--faq-pad) 18px;
  border-top: 1px solid rgba(30, 58, 99, 0.65);
  animation: faq-body-in 0.28s var(--ease) both;
}

@keyframes faq-body-in {
  from {
    opacity: 0;
    transform: translateY(-5px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.page-faq .faq-item__body p {
  margin: 0 0 10px;
  max-width: 66ch;
  font-size: var(--step-3);
  line-height: 1.7;
  color: var(--text-soft);
}

.page-faq .faq-item__links {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 14px;
  margin: 4px 0 0;
  font-size: var(--step-2);
  color: var(--muted);
}

.page-faq .faq-item__links a {
  color: var(--cyan-soft);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease);
}

.page-faq .faq-item__links a:hover,
.page-faq .faq-item__links a:focus-visible {
  color: var(--cyan);
  border-bottom-color: currentColor;
}

.page-faq .faq-item__anchor {
  margin-left: auto;
  color: var(--muted-deep);
  border-bottom-color: transparent;
}

.page-faq .faq-item__anchor:hover,
.page-faq .faq-item__anchor:focus-visible {
  color: var(--cyan);
}

/* ---------- 收尾 ---------- */

.page-faq .faq-outro {
  display: grid;
  gap: 14px;
  justify-items: start;
  padding: clamp(20px, 3vw, 28px);
  background: linear-gradient(115deg, rgba(18, 41, 79, 0.9), rgba(11, 27, 58, 0.55));
  border-left: 3px solid var(--cyan);
}

.page-faq .faq-outro__text {
  margin: 0;
  max-width: 62ch;
  font-size: var(--step-3);
  line-height: 1.7;
  color: var(--text-soft);
}

/* ---------- 焦点与动效 ---------- */

.page-faq a:focus-visible,
.page-faq .faq-item__summary:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

/* ---------- 响应式 ---------- */

@media (max-width: 619px) {
  .page-faq .faq-metrics {
    gap: 8px 20px;
  }

  .page-faq .faq-metrics__num {
    font-size: var(--step-4);
  }

  .page-faq .faq-item__summary {
    flex-wrap: wrap;
    gap: 8px 10px;
  }

  .page-faq .faq-item__summary::after {
    align-self: center;
  }

  .page-faq .faq-item__q {
    flex: 1 1 100%;
  }

  .page-faq .faq-item__anchor {
    margin-left: 0;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-layout {
    grid-template-columns: minmax(232px, var(--faq-rail)) minmax(0, 1fr);
    align-items: start;
  }

  .page-faq .faq-index {
    position: sticky;
    top: 106px;
  }

  .page-faq .faq-group__title {
    font-size: var(--step-6);
  }

  .page-faq .faq-group__head {
    grid-template-columns: 62px minmax(0, 1fr);
  }
}

@media (min-width: 1180px) {
  .page-faq .faq-group__items {
    padding-left: 76px;
  }

  .page-faq .faq-figure {
    margin-left: 76px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item,
  .page-faq .faq-item__no,
  .page-faq .faq-item__summary::after,
  .page-faq .faq-index__link,
  .page-faq .faq-item__body {
    animation: none !important;
    transition: none !important;
  }

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