.page-faq {
  position: relative;
  padding: clamp(26px, 4.6vw, 54px) 0 clamp(64px, 8vw, 112px);
  color: var(--silver);
  background:
    radial-gradient(1080px 520px at 82% -14%, rgba(58, 46, 92, 0.6), transparent 68%),
    radial-gradient(720px 420px at 2% 12%, rgba(53, 224, 214, 0.1), transparent 72%);
  overflow-x: hidden;
}

.page-faq .shell {
  position: relative;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  margin-top: 18px;
  padding: clamp(24px, 4vw, 46px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    linear-gradient(160deg, rgba(14, 27, 49, 0.94), rgba(6, 13, 26, 0.8) 62%, rgba(58, 46, 92, 0.5));
  overflow: hidden;
}

.page-faq .faq-hero::before,
.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  width: 20px;
  height: 20px;
  border: 2px solid var(--cyan);
  opacity: 0.55;
  pointer-events: none;
}

.page-faq .faq-hero::before {
  top: 10px;
  left: 10px;
  border-right: 0;
  border-bottom: 0;
}

.page-faq .faq-hero::after {
  right: 10px;
  bottom: 10px;
  border-top: 0;
  border-left: 0;
}

.page-faq h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: clamp(1.85rem, 5.4vw, var(--fs-700));
  font-weight: 800;
  line-height: 1.14;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-faq .faq-lede {
  max-width: 62ch;
  margin: 18px 0 0;
  font-size: var(--fs-400);
  line-height: 1.85;
  color: var(--dim-strong);
}

.page-faq .faq-index {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-top: 30px;
  padding-top: 22px;
  border-top: 1px dashed var(--line);
}

.page-faq .faq-index-label {
  width: 100%;
  margin: 0 0 2px;
  font-family: var(--font-mono);
  font-size: var(--fs-100);
  letter-spacing: 0.14em;
  color: var(--dim);
  text-transform: uppercase;
}

.page-faq .faq-index a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 16px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(20, 40, 58, 0.66);
  color: var(--silver);
  font-size: var(--fs-200);
  text-decoration: none;
  transition: background 0.22s ease, color 0.22s ease, border-color 0.22s ease;
}

.page-faq .faq-index a .mono {
  font-size: var(--fs-100);
  color: var(--cyan);
  letter-spacing: 0.08em;
  transition: color 0.22s ease;
}

.page-faq .faq-index a:hover,
.page-faq .faq-index a:focus-visible {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink);
  outline: none;
}

.page-faq .faq-index a:hover .mono,
.page-faq .faq-index a:focus-visible .mono {
  color: rgba(6, 13, 26, 0.7);
}

/* ---------- 分组骨架 ---------- */
.page-faq .faq-group {
  display: grid;
  gap: 20px;
  margin-top: clamp(46px, 6.4vw, 84px);
  scroll-margin-top: 132px;
  --accent: var(--cyan);
}

.page-faq .faq-group[data-accent="gold"] {
  --accent: var(--gold);
}

.page-faq .faq-group[data-accent="ember"] {
  --accent: var(--ember);
}

.page-faq .faq-group[data-accent="glow"] {
  --accent: var(--glow);
}

.page-faq .faq-group[data-accent="silver"] {
  --accent: var(--silver);
}

.page-faq .faq-rail {
  position: relative;
  padding-left: 16px;
  border-left: 2px solid var(--accent);
}

.page-faq .faq-rail .group-num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-300);
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--accent);
}

.page-faq .faq-rail h2 {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-size: var(--fs-500);
  font-weight: 800;
  line-height: 1.2;
  color: var(--white);
}

.page-faq .faq-rail .group-note {
  margin: 12px 0 0;
  font-size: var(--fs-200);
  line-height: 1.75;
  color: var(--dim);
}

/* ---------- 配图 ---------- */
.page-faq .faq-figure {
  margin: 0 0 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--night);
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 折叠面板 ---------- */
.page-faq .qa-list {
  padding: 6px clamp(14px, 2.6vw, 26px) 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(14, 27, 49, 0.76), rgba(6, 13, 26, 0.76));
  backdrop-filter: blur(8px);
}

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

.page-faq .qa-item:last-child {
  border-bottom: 0;
}

.page-faq .qa-item > summary {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 18px 0;
  list-style: none;
  cursor: pointer;
  font-size: var(--fs-400);
  font-weight: 600;
  line-height: 1.55;
  color: var(--white);
  transition: color 0.2s ease;
}

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

.page-faq .qa-item > summary::marker {
  content: "";
}

.page-faq .qa-item > summary:hover,
.page-faq .qa-item > summary:focus-visible {
  color: var(--accent);
  outline: none;
}

.page-faq .qa-mark {
  flex: none;
  width: 11px;
  height: 11px;
  margin-top: 8px;
  border-right: 1.5px solid var(--accent);
  border-bottom: 1.5px solid var(--accent);
  transform: rotate(45deg);
  transition: transform 0.26s ease;
}

.page-faq .qa-item[open] .qa-mark {
  transform: rotate(225deg);
}

.page-faq .qa-body {
  padding: 0 0 20px 25px;
}

.page-faq .qa-body p {
  margin: 0;
  padding: 14px 16px;
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--accent);
  background: rgba(20, 40, 58, 0.94);
  font-size: var(--fs-300);
  line-height: 1.85;
  color: var(--dim-strong);
}

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

.page-faq .qa-body a:hover {
  color: var(--glow);
}

.page-faq .qa-item[open] .qa-body {
  animation: faq-open 0.26s ease both;
}

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

/* ---------- 人工通道 ---------- */
.page-faq .faq-cta {
  display: grid;
  gap: 20px;
  padding: clamp(22px, 3vw, 34px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(135deg, rgba(58, 46, 92, 0.66), rgba(14, 27, 49, 0.9));
}

.page-faq .faq-cta h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: var(--fs-500);
  font-weight: 800;
  color: var(--white);
}

.page-faq .faq-cta p {
  margin: 12px 0 0;
  font-size: var(--fs-300);
  line-height: 1.85;
  color: var(--dim-strong);
}

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

.page-faq .faq-foot-note {
  margin: 18px 0 0;
  font-size: var(--fs-200);
  line-height: 1.8;
  color: var(--dim);
}

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

/* ---------- 回到顶部 ---------- */
.page-faq .faq-top {
  position: fixed;
  right: 16px;
  bottom: 20px;
  z-index: 40;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 15px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(6, 13, 26, 0.88);
  backdrop-filter: blur(6px);
  color: var(--dim-strong);
  font-family: var(--font-mono);
  font-size: var(--fs-100);
  letter-spacing: 0.08em;
  text-decoration: none;
  transition: border-color 0.22s ease, color 0.22s ease;
}

.page-faq .faq-top::before {
  content: "";
  width: 14px;
  height: 14px;
  border-radius: 50%;
  border: 1.5px solid var(--cyan);
  border-top-color: transparent;
  border-right-color: var(--gold);
}

.page-faq .faq-top:hover,
.page-faq .faq-top:focus-visible {
  border-color: var(--cyan);
  color: var(--white);
  outline: none;
}

/* ---------- 断点 ---------- */
@media (max-width: 560px) {
  .page-faq .faq-index a {
    padding: 8px 13px;
    font-size: var(--fs-100);
  }

  .page-faq .qa-body {
    padding-left: 0;
  }

  .page-faq .cta-actions .btn {
    flex: 1 1 100%;
    justify-content: center;
    text-align: center;
  }

  .page-faq .faq-top {
    right: 12px;
    bottom: 14px;
    padding: 9px 12px;
  }
}

@media (min-width: 920px) {
  .page-faq .faq-group {
    grid-template-columns: 232px minmax(0, 1fr);
    gap: 46px;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: 142px;
    align-self: start;
  }

  .page-faq .faq-figure--tall img {
    max-height: 520px;
    object-position: center 30%;
  }
}

@media (min-width: 760px) {
  .page-faq .faq-cta {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    align-items: center;
    gap: 28px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa-item[open] .qa-body {
    animation: none;
  }

  .page-faq .qa-mark,
  .page-faq .faq-index a,
  .page-faq .faq-top,
  .page-faq .qa-item > summary {
    transition: none;
  }
}