.page-faq {
  --faq-rail: 96px;
  position: relative;
}

/* ── 首屏 ─────────────────────────────────────────── */
.page-faq .faq-hero {
  padding: clamp(22px, 4vw, 40px) 0 0;
}

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

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

.page-faq .faq-hero__rail {
  display: flex;
  align-items: center;
  gap: 14px;
}

.page-faq .faq-hero__mark {
  font-family: var(--font-mono);
  font-size: 46px;
  font-weight: 700;
  line-height: 1;
  color: var(--gold);
  letter-spacing: -0.02em;
}

.page-faq .faq-hero__rail-text {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.26em;
  color: var(--muted);
  white-space: nowrap;
}

.page-faq .faq-hero__content .eyebrow {
  margin: 0 0 10px;
}

.page-faq .faq-hero__content h1 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(28px, 6vw, 50px);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-faq .faq-hero__content .lede {
  margin: 16px 0 0;
  max-width: 62ch;
  font-family: var(--font-body);
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: rgba(230, 237, 247, 0.78);
}

.page-faq .faq-stats {
  list-style: none;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 1px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.page-faq .faq-stats li {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 12px 14px;
  background: var(--ink-900);
}

.page-faq .faq-stats__num {
  font-family: var(--font-mono);
  font-size: clamp(16px, 2.2vw, 20px);
  font-weight: 700;
  color: var(--gold);
  letter-spacing: 0.01em;
}

.page-faq .faq-stats__label {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.page-faq .faq-hero__media {
  position: relative;
  margin: clamp(26px, 4vw, 40px) 0 0;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--ink-800);
}

.page-faq .faq-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 12 / 5;
  object-fit: cover;
}

.page-faq .faq-hero__caption {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 7px 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--ink-900);
  background: var(--gold);
}

/* ── 主体两栏 ─────────────────────────────────────── */
.page-faq .faq-layout {
  display: grid;
  gap: clamp(28px, 4vw, 40px);
  margin-top: clamp(36px, 6vw, 68px);
}

.page-faq .faq-side__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--muted);
}

.page-faq .faq-nav__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-faq .faq-nav__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 7px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 700;
  color: var(--paper);
  text-decoration: none;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease),
    background-color 0.2s var(--ease);
}

.page-faq .faq-nav__link .mono {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  color: var(--muted);
  transition: color 0.2s var(--ease);
}

.page-faq .faq-nav__link:hover,
.page-faq .faq-nav__link:focus-visible {
  color: var(--cyan);
  border-color: var(--line-cyan);
  background: var(--ink-800);
  outline: none;
}

.page-faq .faq-nav__link:hover .mono {
  color: var(--cyan);
}

.page-faq .faq-side__note {
  margin-top: 22px;
  padding: 16px 16px 18px;
  border: 1px solid var(--line);
  border-left: 2px solid var(--signal);
  border-radius: var(--radius);
  background: var(--ink-800);
}

.page-faq .faq-side__note-title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 700;
  color: var(--paper);
}

.page-faq .faq-side__note p {
  margin: 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--muted);
}

.page-faq .faq-side__note-link {
  display: inline-block;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease);
}

.page-faq .faq-side__note-link:hover {
  border-bottom-color: var(--cyan);
}

/* ── 问答分组 ─────────────────────────────────────── */
.page-faq .faq-group {
  scroll-margin-top: 110px;
}

.page-faq .faq-group + .faq-group {
  margin-top: clamp(44px, 7vw, 80px);
}

.page-faq .section-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  column-gap: 16px;
  row-gap: 6px;
  align-items: baseline;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line-strong);
}

.page-faq .section-head__num {
  grid-row: 1 / span 2;
  font-family: var(--font-mono);
  font-size: clamp(30px, 5vw, 46px);
  font-weight: 700;
  line-height: 1;
  color: var(--gold);
  letter-spacing: -0.02em;
}

.page-faq .section-head__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(19px, 2.6vw, 27px);
  font-weight: 800;
  line-height: 1.25;
  color: var(--paper);
}

.page-faq .section-head__note {
  grid-column: 2;
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--muted);
}

.page-faq .faq-list {
  margin-top: 16px;
}

/* ── 折叠面板 ─────────────────────────────────────── */
.page-faq .qa {
  margin-top: 9px;
  border: 1px solid var(--line);
  border-left: 2px solid var(--ink-700);
  border-radius: var(--radius);
  background: var(--ink-800);
  transition: border-color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.page-faq .qa:hover {
  border-left-color: var(--cyan);
}

.page-faq .qa[open] {
  border-left-color: var(--signal);
  background: var(--ink-750);
}

.page-faq .qa__q {
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr) 16px;
  column-gap: 10px;
  align-items: start;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
  line-height: 1.6;
  color: var(--paper);
  transition: color 0.2s var(--ease);
}

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

.page-faq .qa__q:hover {
  color: var(--cyan);
}

.page-faq .qa__num {
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--muted);
  transition: color 0.2s var(--ease);
}

.page-faq .qa[open] .qa__num {
  color: var(--gold);
}

.page-faq .qa__icon {
  position: relative;
  width: 14px;
  height: 14px;
  margin-top: 5px;
  justify-self: end;
}

.page-faq .qa__icon::before,
.page-faq .qa__icon::after {
  content: "";
  position: absolute;
  background: var(--signal);
  transition: transform 0.2s var(--ease);
}

.page-faq .qa__icon::before {
  top: 6px;
  left: 0;
  width: 14px;
  height: 2px;
}

.page-faq .qa__icon::after {
  top: 0;
  left: 6px;
  width: 2px;
  height: 14px;
}

.page-faq .qa[open] .qa__icon::after {
  transform: scaleY(0);
}

.page-faq .qa__a {
  padding: 0 16px 17px 16px;
  border-top: 1px solid var(--line);
  margin-top: 2px;
  padding-top: 13px;
  font-family: var(--font-body);
  font-size: 14.5px;
  line-height: 1.9;
  color: rgba(230, 237, 247, 0.8);
}

.page-faq .qa__a p {
  margin: 0;
}

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

/* ── 章节配图 ─────────────────────────────────────── */
.page-faq .faq-figure {
  margin: 20px 0 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--ink-800);
  overflow: hidden;
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 8 / 5;
  object-fit: cover;
}

.page-faq .faq-figure figcaption {
  padding: 11px 16px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

/* ── 结尾行动区 ───────────────────────────────────── */
.page-faq .faq-cta {
  margin-top: clamp(46px, 7vw, 84px);
}

.page-faq .faq-cta__inner {
  display: grid;
  gap: 22px;
  padding: clamp(22px, 3.6vw, 36px);
  border: 1px solid var(--line-signal);
  border-left: 3px solid var(--signal);
  border-radius: var(--radius);
  background: linear-gradient(135deg, var(--ink-800) 0%, var(--ink-750) 100%);
}

.page-faq .faq-cta__text .eyebrow {
  margin: 0 0 8px;
}

.page-faq .faq-cta__text h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(20px, 2.8vw, 28px);
  font-weight: 800;
  line-height: 1.3;
  color: var(--paper);
}

.page-faq .faq-cta__text p {
  margin: 12px 0 0;
  max-width: 56ch;
  font-size: 14.5px;
  line-height: 1.85;
  color: rgba(230, 237, 247, 0.78);
}

.page-faq .faq-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-faq .faq-cta__contact {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
}

.page-faq .faq-cta__contact .copy-chip {
  font-family: var(--font-mono);
  font-size: 12.5px;
}

/* ── 回到顶部 ─────────────────────────────────────── */
.page-faq .to-top {
  position: fixed;
  right: clamp(14px, 3vw, 28px);
  bottom: clamp(14px, 3vw, 28px);
  z-index: 20;
  padding: 9px 13px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--ink-800);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity 0.2s var(--ease), transform 0.2s var(--ease),
    border-color 0.2s var(--ease), color 0.2s var(--ease);
}

.page-faq .to-top[data-visible] {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.page-faq .to-top:hover {
  border-color: var(--signal);
  color: var(--signal);
}

/* ── 平板 ─────────────────────────────────────────── */
@media (min-width: 700px) {
  .page-faq .faq-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-faq .faq-hero__grid {
    grid-template-columns: var(--faq-rail) minmax(0, 1fr);
    column-gap: 30px;
    align-items: start;
  }

  .page-faq .faq-hero__rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
    align-self: stretch;
    padding-right: 18px;
    border-right: 1px solid var(--line);
  }

  .page-faq .faq-hero__rail-text {
    writing-mode: vertical-rl;
    text-orientation: upright;
    letter-spacing: 0.3em;
  }

  .page-faq .qa__q {
    grid-template-columns: 34px minmax(0, 1fr) 18px;
    column-gap: 12px;
    padding: 16px 20px;
    font-size: 15.5px;
  }

  .page-faq .qa__a {
    padding: 14px 20px 19px 66px;
    font-size: 15px;
  }
}

/* ── 桌面 ─────────────────────────────────────────── */
@media (min-width: 1000px) {
  .page-faq .faq-layout {
    grid-template-columns: 228px minmax(0, 1fr);
    column-gap: 52px;
    align-items: start;
  }

  .page-faq .faq-side {
    position: sticky;
    top: 116px;
  }

  .page-faq .faq-nav__list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 0;
    border-top: 1px solid var(--line);
  }

  .page-faq .faq-nav__link {
    display: flex;
    justify-content: flex-start;
    padding: 11px 0;
    border: 0;
    border-bottom: 1px solid var(--line);
    border-radius: 0;
    background: none;
    font-size: 14px;
    transition: color 0.2s var(--ease), padding-left 0.2s var(--ease),
      border-color 0.2s var(--ease);
  }

  .page-faq .faq-nav__link:hover,
  .page-faq .faq-nav__link:focus-visible {
    padding-left: 6px;
    border-bottom-color: var(--line-cyan);
    background: none;
  }

  .page-faq .faq-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    column-gap: 40px;
  }

  .page-faq .faq-cta__contact {
    grid-column: 1 / -1;
    margin-top: 4px;
    padding-top: 18px;
    border-top: 1px solid var(--line);
  }
}

@media (min-width: 1200px) {
  .page-faq {
    --faq-rail: 110px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa,
  .page-faq .qa__q,
  .page-faq .qa__icon::before,
  .page-faq .qa__icon::after,
  .page-faq .faq-nav__link,
  .page-faq .to-top {
    transition: none;
  }
}