.page-faq {
  --faq-gap: clamp(18px, 3.2vw, 36px);
  --faq-group-gap: clamp(30px, 5vw, 52px);
  --faq-line: rgba(47, 243, 208, 0.24);
  --faq-answer-pad: clamp(6px, 2vw, 34px);
  padding-bottom: clamp(56px, 8vw, 104px);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(28px, 5vw, 56px) 0 clamp(30px, 5vw, 60px);
  background:
    linear-gradient(160deg, var(--arena-slate-a) 0%, var(--arena-ink) 58%, var(--arena-ink) 100%);
  border-bottom: 1px solid var(--arena-line);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: -20% -10% 0 -10%;
  background-image: repeating-linear-gradient(
    12deg,
    rgba(47, 243, 208, 0.09) 0 1px,
    transparent 1px 15px
  );
  -webkit-mask-image: radial-gradient(120% 85% at 82% 0%, #000 0%, transparent 72%);
  mask-image: radial-gradient(120% 85% at 82% 0%, #000 0%, transparent 72%);
  pointer-events: none;
}

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

.page-faq .faq-hero .arena-crumbs {
  margin-bottom: clamp(20px, 3.5vw, 34px);
}

.page-faq .faq-hero-title {
  max-width: 20ch;
  margin: 10px 0 0;
}

.page-faq .faq-hero-lede {
  max-width: 60ch;
  margin-top: clamp(14px, 2.4vw, 22px);
}

.page-faq .faq-hero-facts {
  list-style: none;
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-faq .faq-fact {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 12px 0;
  border-top: 1px solid var(--arena-line);
}

.page-faq .faq-fact-num {
  flex: none;
  min-width: 3.6em;
  font-size: clamp(18px, 2.4vw, 24px);
  color: var(--arena-cyan);
  letter-spacing: -0.02em;
}

.page-faq .faq-fact-label {
  font-size: 14px;
  line-height: 1.6;
  color: var(--arena-muted);
}

/* ---------- 主体布局 ---------- */
.page-faq .faq-body {
  padding-top: clamp(34px, 5.5vw, 64px);
}

.page-faq .faq-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--faq-group-gap);
  align-items: start;
}

/* ---------- 目录 ---------- */
.page-faq .faq-toc-title {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--arena-muted);
}

.page-faq .faq-toc-list {
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.page-faq .faq-toc-list::-webkit-scrollbar {
  display: none;
}

.page-faq .faq-toc-list li {
  flex: none;
}

.page-faq .faq-toc-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 15px;
  border-radius: 999px;
  background: var(--arena-panel);
  border: 1px solid transparent;
  color: var(--arena-muted);
  font-size: 13.5px;
  line-height: 1.4;
  white-space: nowrap;
  text-decoration: none;
  transition: color 0.24s var(--arena-ease), border-color 0.24s var(--arena-ease),
    background 0.24s var(--arena-ease);
}

.page-faq .faq-toc-link .arena-mono {
  color: var(--arena-cyan);
  font-size: 12px;
}

.page-faq .faq-toc-link:hover,
.page-faq .faq-toc-link:focus-visible {
  color: var(--arena-cyan-soft);
  border-color: var(--faq-line);
  background: #0A231D;
}

.page-faq .faq-toc-note {
  margin: 14px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--arena-muted);
  max-width: 34ch;
}

/* ---------- 分组 ---------- */
.page-faq .faq-group {
  scroll-margin-top: 108px;
}

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

.page-faq .faq-group-head {
  display: grid;
  gap: 10px;
  margin-bottom: clamp(14px, 2.4vw, 22px);
}

.page-faq .faq-group-title {
  margin: 0;
  font-size: clamp(22px, 3.6vw, 34px);
  font-weight: 900;
  letter-spacing: -0.03em;
  line-height: 1.18;
  color: var(--arena-text);
}

.page-faq .faq-group-note {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--arena-muted);
  max-width: 46ch;
}

/* ---------- 问答折叠 ---------- */
.page-faq .faq-list {
  display: grid;
}

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

.page-faq .faq-item:first-child {
  border-top: 1px solid var(--arena-line);
}

.page-faq .faq-q {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  min-height: 58px;
  padding: 17px 6px;
  cursor: pointer;
  list-style: none;
  border-radius: var(--arena-radius-sm);
  transition: background 0.22s var(--arena-ease);
}

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

.page-faq .faq-q:hover,
.page-faq .faq-q:focus-visible {
  background: rgba(12, 44, 36, 0.72);
}

.page-faq .faq-q-num {
  flex: none;
  padding-top: 4px;
  font-size: 12.5px;
  color: var(--arena-cyan);
  letter-spacing: 0.02em;
}

.page-faq .faq-q-text {
  flex: 1 1 auto;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.55;
  letter-spacing: -0.01em;
  color: var(--arena-text);
  transition: color 0.22s var(--arena-ease);
}

.page-faq .faq-item[open] .faq-q-text {
  color: var(--arena-cyan-soft);
}

.page-faq .faq-q-icon {
  position: relative;
  flex: none;
  width: 18px;
  height: 18px;
  margin-top: 4px;
}

.page-faq .faq-q-icon::before,
.page-faq .faq-q-icon::after {
  content: "";
  position: absolute;
  background: var(--arena-cyan);
  border-radius: 2px;
}

.page-faq .faq-q-icon::before {
  left: 0;
  right: 0;
  top: 8px;
  height: 2px;
}

.page-faq .faq-q-icon::after {
  top: 0;
  bottom: 0;
  left: 8px;
  width: 2px;
  transition: transform 0.28s var(--arena-ease), opacity 0.28s var(--arena-ease);
}

.page-faq .faq-item[open] .faq-q-icon::after {
  transform: rotate(90deg);
  opacity: 0;
}

.page-faq .faq-a {
  display: grid;
  gap: 14px;
  padding: 2px 6px 22px var(--faq-answer-pad);
}

.page-faq .faq-a-text {
  margin: 0;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--arena-text);
}

.page-faq .faq-a-meta {
  margin: 0;
  padding-left: 11px;
  border-left: 2px solid var(--faq-line);
  font-size: 12.5px;
  line-height: 1.75;
  color: var(--arena-muted);
}

.page-faq .faq-a-meta a {
  color: var(--arena-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 243, 208, 0.45);
  transition: color 0.22s var(--arena-ease);
}

.page-faq .faq-a-meta a:hover,
.page-faq .faq-a-meta a:focus-visible {
  color: var(--arena-cyan-soft);
}

/* ---------- 图 ---------- */
.page-faq .faq-figure {
  margin: 0 0 clamp(18px, 2.6vw, 26px);
  display: grid;
  gap: 10px;
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border-radius: var(--arena-radius-md);
  border: 1px solid var(--arena-line);
  background: var(--arena-slate-a);
}

.page-faq .faq-figure-cap {
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--arena-muted);
  max-width: 52ch;
}

/* ---------- 底部提示条 ---------- */
.page-faq .faq-callout {
  margin-top: clamp(26px, 4vw, 40px);
  padding: clamp(20px, 3.4vw, 32px);
  border-radius: var(--arena-radius-organic);
  border: 1px solid var(--faq-line);
  background: linear-gradient(135deg, var(--arena-panel) 0%, #0A231D 100%);
  display: grid;
  gap: 12px;
}

.page-faq .faq-callout-k {
  margin: 0;
  font-size: clamp(17px, 2.4vw, 22px);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.35;
  color: var(--arena-text);
}

.page-faq .faq-callout-d {
  margin: 0;
  max-width: 54ch;
  font-size: 14px;
  line-height: 1.75;
  color: var(--arena-muted);
}

.page-faq .faq-callout-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-top: 4px;
}

.page-faq .faq-copy-btn {
  max-width: 100%;
  overflow-wrap: anywhere;
}

.page-faq .faq-copy-btn .arena-mono {
  font-size: 12.5px;
}

.page-faq .faq-copy-hint {
  font-size: 12.5px;
  color: var(--arena-muted);
}

.page-faq .faq-copy-btn[data-copied] .faq-copy-hint,
.page-faq .faq-copy-hint[data-copied] {
  color: var(--arena-cyan);
}

/* ---------- 平板及以上 ---------- */
@media (min-width: 720px) {
  .page-faq .faq-a {
    grid-template-columns: minmax(0, 1fr) 186px;
    gap: 20px;
    align-items: start;
  }

  .page-faq .faq-hero-facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0;
    border-top: 1px solid var(--arena-line);
  }

  .page-faq .faq-fact {
    flex-direction: column;
    gap: 6px;
    padding: 16px 18px 0 0;
    border-top: 0;
  }

  .page-faq .faq-fact + .faq-fact {
    padding-left: 18px;
    border-left: 1px solid var(--arena-line);
  }
}

/* ---------- 桌面及以上 ---------- */
@media (min-width: 1000px) {
  .page-faq .faq-layout {
    grid-template-columns: 232px minmax(0, 1fr);
    gap: clamp(36px, 4.5vw, 64px);
  }

  .page-faq .faq-toc {
    position: sticky;
    top: 112px;
    padding-right: 8px;
  }

  .page-faq .faq-toc-list {
    display: block;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-faq .faq-toc-list li + li {
    margin-top: 4px;
  }

  .page-faq .faq-toc-link {
    display: flex;
    border-radius: var(--arena-radius-sm);
    border-left: 2px solid transparent;
  }

  .page-faq .faq-toc-link:hover,
  .page-faq .faq-toc-link:focus-visible {
    border-left-color: var(--arena-cyan);
  }

  .page-faq .faq-q-text {
    font-size: 17px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-q,
  .page-faq .faq-q-text,
  .page-faq .faq-q-icon::after,
  .page-faq .faq-toc-link,
  .page-faq .faq-a-meta a {
    transition: none;
  }
}