.page-faq {
  --faq-line: rgba(143, 166, 184, 0.32);
  --faq-line-cyan: rgba(53, 242, 208, 0.42);
  --faq-rail-w: 226px;
  background: var(--deep);
  color: var(--cream);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  overflow-x: hidden;
}

.page-faq img {
  max-width: 100%;
  height: auto;
}

.page-faq .faq-crumbs {
  padding-top: 18px;
  padding-bottom: 4px;
}

/* ---------- 封面首屏 ---------- */

.page-faq .faq-cover {
  position: relative;
  margin-top: 12px;
  border-top: var(--bw) solid var(--faq-line-cyan);
  border-bottom: var(--bw) solid var(--faq-line-cyan);
  background:
    radial-gradient(120% 100% at 6% 0%, rgba(53, 242, 208, 0.18), transparent 58%),
    radial-gradient(100% 92% at 102% 14%, rgba(255, 107, 74, 0.16), transparent 62%),
    var(--deep);
  overflow: hidden;
}

.page-faq .faq-cover::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(0deg, rgba(143, 166, 184, 0.13) 0 1px, transparent 1px 44px),
    repeating-linear-gradient(90deg, rgba(143, 166, 184, 0.13) 0 1px, transparent 1px 44px);
  opacity: 0.5;
  pointer-events: none;
}

.page-faq .faq-cover__grid {
  position: relative;
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  padding-top: clamp(30px, 6vw, 64px);
  padding-bottom: clamp(30px, 6vw, 64px);
}

.page-faq .faq-cover h1 {
  margin: 14px 0 18px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.9rem, 6.4vw, 3.5rem);
  line-height: 1.12;
  letter-spacing: -0.01em;
  color: var(--cream);
}

.page-faq .faq-cover .lede {
  margin: 0;
  color: var(--mist);
  font-size: clamp(1rem, 1.6vw, 1.12rem);
  max-width: 60ch;
}

.page-faq .faq-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px 16px;
  margin: 26px 0 0;
  padding: 18px 0 0;
  list-style: none;
  border-top: var(--bw) solid var(--faq-line);
}

.page-faq .faq-facts li {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.page-faq .faq-facts b {
  font-family: var(--font-mono);
  font-size: 1.32rem;
  line-height: 1.1;
  color: var(--cyan);
}

.page-faq .faq-facts span {
  font-size: 0.82rem;
  color: var(--gray);
  letter-spacing: 0.02em;
}

.page-faq .faq-cover__figure {
  margin: 0;
  align-self: stretch;
}

.page-faq .faq-cover__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: var(--bw) solid var(--faq-line-cyan);
  box-shadow: var(--shadow-panel);
}

/* ---------- 主体：旁注索引 + 问答流 ---------- */

.page-faq .faq-body {
  display: grid;
  gap: clamp(26px, 4vw, 46px);
  padding-top: clamp(30px, 6vw, 62px);
  padding-bottom: clamp(30px, 6vw, 62px);
}

.page-faq .faq-rail {
  padding: 18px 16px 20px;
  border: var(--bw) solid var(--faq-line);
  background: var(--navy);
  box-shadow: var(--shadow-panel);
}

.page-faq .faq-rail__list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px;
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-rail__list a {
  display: flex;
  gap: 9px;
  align-items: baseline;
  padding: 9px 10px;
  font-size: 0.94rem;
  line-height: 1.45;
  color: var(--mist);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: background 0.18s ease, border-color 0.18s ease, color 0.18s ease;
}

.page-faq .faq-rail__list a:hover,
.page-faq .faq-rail__list a:focus-visible {
  background: rgba(53, 242, 208, 0.1);
  border-left-color: var(--cyan);
  color: var(--cream);
}

.page-faq .faq-rail__list .mono-num {
  font-size: 0.78rem;
  color: var(--cyan);
  flex: none;
}

.page-faq .faq-rail .note {
  margin: 18px 0 0;
}

/* ---------- 问答分组 ---------- */

.page-faq .faq-group {
  scroll-margin-top: calc(var(--head-h) + 24px);
}

.page-faq .faq-group + .faq-group {
  margin-top: clamp(34px, 5vw, 58px);
}

.page-faq .faq-head {
  padding-top: 16px;
  border-top: 3px solid var(--cyan);
  margin-bottom: 20px;
}

.page-faq .faq-head .eyebrow {
  margin-bottom: 8px;
}

.page-faq .faq-title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.3rem, 3.4vw, 1.95rem);
  line-height: 1.24;
  color: var(--cream);
}

.page-faq .faq-lead {
  margin: 0;
  max-width: 62ch;
  color: var(--mist);
  font-size: 0.98rem;
}

.page-faq .faq-list {
  display: block;
}

.page-faq .faq-item {
  border: var(--bw) solid var(--faq-line);
  background: var(--navy);
  box-shadow: var(--shadow-panel);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

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

.page-faq .faq-item[open] {
  border-color: var(--faq-line-cyan);
  box-shadow: 6px 6px 0 rgba(53, 242, 208, 0.22);
}

.page-faq .faq-item > summary {
  position: relative;
  display: flex;
  gap: 12px;
  align-items: flex-start;
  padding: 14px 46px 14px 16px;
  cursor: pointer;
  list-style: none;
  font-size: 1.01rem;
  font-weight: 600;
  line-height: 1.55;
  color: var(--cream);
  transition: background 0.18s ease;
}

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

.page-faq .faq-item > summary:hover {
  background: rgba(53, 242, 208, 0.06);
}

.page-faq .faq-item > summary::after {
  content: "+";
  position: absolute;
  right: 15px;
  top: 11px;
  font-family: var(--font-mono);
  font-size: 1.35rem;
  line-height: 1;
  color: var(--cyan);
}

.page-faq .faq-item[open] > summary::after {
  content: "\2013";
  color: var(--coral);
}

.page-faq .faq-num {
  flex: none;
  padding-top: 0.3em;
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

.page-faq .faq-a {
  padding: 0 18px 18px;
  border-top: 1px solid var(--faq-line);
  color: var(--mist);
  font-size: 0.97rem;
}

.page-faq .faq-a p {
  margin: 14px 0 0;
}

.page-faq .faq-a a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-faq .faq-a a:hover {
  color: var(--glass);
}

/* ---------- 联系区 ---------- */

.page-faq .faq-contact__grid {
  display: grid;
  gap: 18px;
}

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

.page-faq .faq-contact__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: var(--bw) solid var(--faq-line-cyan);
  box-shadow: var(--shadow-coral);
}

/* ---------- 底部双入口条 ---------- */

.page-faq .faq-gate {
  margin-top: clamp(30px, 5vw, 56px);
  border-top: var(--bw) solid var(--faq-line-cyan);
  border-bottom: var(--bw) solid var(--faq-line-cyan);
  background:
    linear-gradient(135deg, rgba(255, 107, 74, 0.16), rgba(53, 242, 208, 0.1)),
    var(--navy);
}

.page-faq .faq-gate__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 18px;
  padding-top: 24px;
  padding-bottom: 24px;
}

.page-faq .faq-gate__text {
  flex: 1 1 280px;
  margin: 0;
  color: var(--mist);
  font-size: 0.97rem;
}

.page-faq .faq-gate__text strong {
  display: block;
  color: var(--cream);
  font-family: var(--font-display);
  font-size: 1.05rem;
  margin-bottom: 4px;
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-faq .faq-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-faq .faq-cover__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: center;
  }

  .page-faq .faq-contact__grid {
    grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
    align-items: start;
    gap: clamp(20px, 3vw, 34px);
  }

  .page-faq .faq-contact__figure {
    position: sticky;
    top: calc(var(--head-h) + 24px);
  }
}

@media (min-width: 1040px) {
  .page-faq .faq-body {
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
    align-items: start;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: calc(var(--head-h) + 20px);
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-rail__list a,
  .page-faq .faq-item,
  .page-faq .faq-item > summary {
    transition: none;
  }
}