.page-faq {
  --faq-gap: clamp(28px, 5vw, 64px);
  --faq-orange-soft: rgba(255, 122, 47, 0.06);
  --faq-orange-soft-hover: rgba(255, 122, 47, 0.13);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding-top: clamp(40px, 8vw, 104px);
  padding-bottom: clamp(32px, 5vw, 64px);
  overflow: hidden;
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 460px;
  background-image: radial-gradient(var(--line) 1px, transparent 1px);
  background-size: 26px 26px;
  -webkit-mask-image: linear-gradient(180deg, #000 0%, transparent 92%);
  mask-image: linear-gradient(180deg, #000 0%, transparent 92%);
  opacity: 0.5;
  pointer-events: none;
  z-index: 0;
}

.page-faq .faq-hero > .container {
  position: relative;
  z-index: 1;
}

.page-faq .faq-hero-label {
  margin: 28px 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--blue);
}

.page-faq .faq-title {
  margin: 0;
  max-width: 24ch;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 5.4vw, 70px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-faq .faq-lede {
  max-width: 60ch;
  margin: 22px 0 0;
}

.page-faq .faq-meta {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(30px, 5vw, 54px) 0 0;
  padding: 1px;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.page-faq .faq-meta li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 20px;
  background: var(--ink-900);
}

.page-faq .faq-meta-num {
  font-size: clamp(17px, 1.8vw, 22px);
  font-weight: 500;
  color: var(--green);
  letter-spacing: 0.02em;
}

.page-faq .faq-meta-label {
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--muted);
}

/* ---------- 分类吸顶导航 ---------- */
.page-faq .faq-catbar {
  position: sticky;
  top: var(--shell-h);
  z-index: 30;
  background: rgba(10, 12, 16, 0.94);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-catbar-inner {
  display: flex;
  align-items: stretch;
  gap: clamp(14px, 2.4vw, 30px);
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.page-faq .faq-catbar-inner::-webkit-scrollbar {
  display: none;
}

.page-faq .cat-link {
  flex: 0 0 auto;
  display: block;
  padding: 13px 2px 11px;
  font-size: 13.5px;
  line-height: 1.4;
  white-space: nowrap;
  text-decoration: none;
  color: var(--muted);
  border-bottom: 2px solid transparent;
  transition: color 150ms var(--ease), border-color 150ms var(--ease);
}

.page-faq .cat-link:hover,
.page-faq .cat-link:focus-visible {
  color: var(--white);
  border-bottom-color: var(--green);
}

/* ---------- 分类区块 ---------- */
.page-faq .faq-group {
  padding-top: clamp(42px, 6.5vw, 82px);
  padding-bottom: clamp(26px, 4vw, 48px);
  scroll-margin-top: calc(var(--shell-h) + 56px);
}

.page-faq .faq-group + .faq-group {
  border-top: 1px solid var(--line);
}

.page-faq .faq-group-head {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: clamp(18px, 2.6vw, 30px);
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-index {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--blue);
}

.page-faq .faq-group-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 3.2vw, 42px);
  line-height: 1.14;
  letter-spacing: -0.015em;
  color: var(--white);
}

.page-faq .faq-figure {
  margin: 0 0 clamp(20px, 3vw, 32px);
}

.page-faq .faq-figure--after {
  margin: clamp(24px, 3.4vw, 40px) 0 0;
}

.page-faq .faq-figure .media-caption {
  margin-top: 10px;
}

/* ---------- 问答组 ---------- */
.page-faq .faq-list {
  border-top: 1px solid var(--line);
}

.page-faq .expand-item {
  border-bottom: 1px solid var(--line);
  transition: background-color 150ms var(--ease);
}

.page-faq .expand-item[open] {
  background: var(--ink-800);
}

.page-faq .expand-summary {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 18px 8px;
  cursor: pointer;
  list-style: none;
}

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

.page-faq .expand-summary::marker {
  content: "";
}

.page-faq .faq-coord {
  flex: 0 0 auto;
  min-width: 30px;
  padding-top: 4px;
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--muted);
  transition: color 150ms var(--ease);
}

.page-faq .expand-item[open] .faq-coord {
  color: var(--blue);
}

.page-faq .faq-q {
  flex: 1 1 auto;
  min-width: 0;
  font-size: clamp(15.5px, 1.3vw, 17px);
  font-weight: 600;
  line-height: 1.5;
  color: var(--white);
  transition: color 150ms var(--ease);
}

.page-faq .expand-summary:hover .faq-q,
.page-faq .expand-summary:focus-visible .faq-q {
  color: var(--blue);
}

.page-faq .expand-summary::after {
  content: "▸";
  flex: 0 0 auto;
  margin-left: auto;
  padding-left: 12px;
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
  transition: transform 150ms var(--ease), color 150ms var(--ease);
}

.page-faq .expand-item[open] .expand-summary::after {
  transform: rotate(90deg);
  color: var(--green);
}

.page-faq .expand-body {
  margin-left: 3px;
  padding: 2px 24px 24px 46px;
  border-left: 2px solid var(--blue);
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--white);
}

.page-faq .expand-body p {
  margin: 0 0 12px;
  max-width: 64ch;
}

.page-faq .expand-body p:last-child {
  margin-bottom: 0;
}

.page-faq .expand-body a {
  color: var(--blue);
  text-decoration: none;
  border-bottom: 1px solid var(--blue);
  transition: color 150ms var(--ease), border-color 150ms var(--ease);
}

.page-faq .expand-body a:hover {
  color: var(--green);
  border-bottom-color: var(--green);
}

.page-faq .faq-range {
  font-family: var(--font-mono);
  font-weight: 500;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.04em;
  color: var(--green);
}

.page-faq .expand-body .table-scroll {
  margin: 4px 0 16px;
}

.page-faq .expand-body .copy-btn {
  display: inline-block;
  padding: 2px 8px;
  margin: 0 2px;
  font-size: 14px;
  font-family: var(--font-mono);
  font-weight: 500;
  color: var(--white);
  background: transparent;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  cursor: pointer;
  transition: color 150ms var(--ease), border-color 150ms var(--ease), background-color 150ms var(--ease);
}

.page-faq .expand-body .copy-btn:hover {
  border-color: var(--blue);
  color: var(--blue);
}

.page-faq .expand-body .copy-btn[data-copied] {
  color: var(--green);
  border-color: var(--green);
  background: rgba(61, 220, 132, 0.1);
}

/* ---------- 仍需要帮助 ---------- */
.page-faq .faq-help {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-top: 20px;
  padding: 13px 16px;
  text-decoration: none;
  background: var(--faq-orange-soft);
  border: 1px solid var(--orange);
  border-radius: var(--radius);
  transition: background-color 150ms var(--ease);
}

.page-faq .faq-help:hover,
.page-faq .faq-help:focus-visible {
  background: var(--faq-orange-soft-hover);
}

.page-faq .faq-help-text {
  font-size: 14px;
  line-height: 1.6;
  color: var(--white);
}

.page-faq .faq-help-arrow {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--orange);
}

/* ---------- 浮动返回入口 ---------- */
.page-faq .faq-back {
  position: fixed;
  right: clamp(12px, 3vw, 28px);
  bottom: clamp(12px, 3vw, 28px);
  z-index: 35;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 14px;
  font-size: 12.5px;
  text-decoration: none;
  color: var(--white);
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: color 150ms var(--ease), border-color 150ms var(--ease);
}

.page-faq .faq-back:hover,
.page-faq .faq-back:focus-visible {
  color: var(--green);
  border-color: var(--green);
}

/* ---------- 响应式 ---------- */
@media (max-width: 900px) {
  .page-faq .faq-meta {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .page-faq .faq-meta {
    grid-template-columns: 1fr;
  }

  .page-faq .faq-meta li {
    padding: 14px 16px;
  }

  .page-faq .expand-summary {
    gap: 10px;
    padding: 16px 4px;
  }

  .page-faq .faq-coord {
    min-width: 26px;
    font-size: 11px;
  }

  .page-faq .expand-body {
    margin-left: 0;
    padding: 2px 4px 20px 16px;
  }

  .page-faq .faq-catbar-inner {
    gap: 18px;
  }

  .page-faq .faq-back {
    padding: 8px 12px;
    font-size: 12px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .cat-link,
  .page-faq .expand-summary::after,
  .page-faq .faq-coord,
  .page-faq .faq-q,
  .page-faq .faq-help,
  .page-faq .faq-back,
  .page-faq .expand-body .copy-btn,
  .page-faq .expand-body a {
    transition: none;
  }
}