.page-faq {
  --faq-sticky-top: 104px;
  --faq-rule: rgba(53, 242, 200, 0.38);
  display: block;
  background: var(--ink-900);
  color: var(--white);
  font-family: var(--font-body);
  line-height: 1.7;
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  padding: clamp(20px, 3vw, 34px) 0 clamp(28px, 4.2vw, 54px);
  border-bottom: 1px solid var(--line-soft);
}

.page-faq .faq-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.4vw, 44px);
  align-items: end;
  margin-top: clamp(16px, 2.4vw, 30px);
}

.page-faq .faq-eyebrow {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: var(--fz-index);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-faq h1 {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-size: clamp(34px, 6vw, 68px);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-faq .faq-lead {
  margin: 0 0 20px;
  max-width: 56ch;
  font-size: var(--fz-body);
  color: var(--mist);
}

.page-faq .faq-hero__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-faq .faq-hero__media {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--ink-700);
  overflow: hidden;
}

.page-faq .faq-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
}

/* ---------- 主体骨架 ---------- */
.page-faq .faq-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 3.6vw, 48px);
  padding: clamp(28px, 4vw, 56px) 0 clamp(56px, 8vw, 96px);
}

.page-faq .faq-nav {
  min-width: 0;
  max-width: 100%;
}

.page-faq .faq-nav__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: var(--fz-index);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-faq .faq-nav__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 10px;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.page-faq .faq-nav__list::-webkit-scrollbar {
  height: 3px;
}

.page-faq .faq-nav__list::-webkit-scrollbar-thumb {
  background: var(--line);
}

.page-faq .faq-nav__link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border: 1px solid var(--line);
  background: var(--ink-700);
  color: var(--mist);
  font-size: 14px;
  white-space: nowrap;
  text-decoration: none;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-faq .faq-nav__link:hover,
.page-faq .faq-nav__link:focus-visible {
  color: var(--white);
  border-color: var(--cyan);
}

.page-faq .faq-nav__idx {
  flex: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.page-faq .faq-content {
  display: flex;
  flex-direction: column;
  gap: clamp(30px, 4.4vw, 56px);
  min-width: 0;
}

/* ---------- 章节 ---------- */
.page-faq .faq-section {
  scroll-margin-top: 110px;
  padding-top: clamp(20px, 2.6vw, 30px);
  border-top: 1px solid var(--line-soft);
}

.page-faq .faq-section:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-faq .faq-section__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 20px;
}

.page-faq .faq-section__num {
  flex: none;
  padding-top: 6px;
  font-family: var(--font-mono);
  font-size: var(--fz-index);
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-faq h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(23px, 3.2vw, 34px);
  font-weight: 700;
  line-height: 1.18;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-faq .faq-section__split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
}

/* ---------- 问答卡片 ---------- */
.page-faq .faq-card {
  border: 1px solid var(--line);
  background: var(--ink-700);
  box-shadow: var(--shadow-soft);
  overflow: hidden;
  transition: border-color 0.24s var(--ease), background 0.24s var(--ease);
}

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

.page-faq .faq-card[open] {
  border-color: var(--faq-rule);
  background: var(--ink-600);
}

.page-faq .faq-card__q {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 17px 20px;
  list-style: none;
  cursor: pointer;
  font-size: clamp(15px, 1.1vw + 12px, 17px);
  font-weight: 600;
  line-height: 1.5;
  color: var(--white);
  transition: background 0.2s var(--ease);
}

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

.page-faq .faq-card__q::after {
  content: "+";
  margin-left: auto;
  flex: none;
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 400;
  line-height: 1.4;
  color: var(--cyan);
  transition: color 0.2s var(--ease);
}

.page-faq .faq-card[open] .faq-card__q::after {
  content: "–";
  color: var(--amber);
}

.page-faq .faq-card__q:hover {
  background: rgba(53, 242, 200, 0.05);
}

.page-faq .faq-card__a {
  padding: 0 20px 20px;
  font-size: var(--fz-body);
  line-height: 1.75;
  color: var(--mist);
}

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

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

.page-faq .faq-card[open] .faq-card__a {
  animation: faq-card-reveal 0.34s var(--ease) both;
}

@keyframes faq-card-reveal {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.page-faq .faq-link {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.page-faq .faq-link:hover,
.page-faq .faq-link:focus-visible {
  color: var(--amber);
}

/* ---------- 旁注图 ---------- */
.page-faq .faq-figure {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--ink-700);
  overflow: hidden;
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
}

.page-faq .faq-figure__cap {
  padding: 12px 14px;
  border-top: 1px solid var(--line-soft);
  font-family: var(--font-mono);
  font-size: var(--fz-index);
  letter-spacing: 0.06em;
  color: var(--mist);
}

/* ---------- 桌面布局 ---------- */
@media (min-width: 900px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
  }

  .page-faq .faq-section__split {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 0.55fr);
    align-items: start;
  }
}

@media (min-width: 1024px) {
  .page-faq .faq-body {
    grid-template-columns: 264px minmax(0, 1fr);
    align-items: start;
    gap: clamp(36px, 4vw, 64px);
  }

  .page-faq .faq-nav {
    position: sticky;
    top: var(--faq-sticky-top);
  }

  .page-faq .faq-nav__list {
    flex-direction: column;
    gap: 0;
    padding: 0;
    overflow: visible;
    border-left: 1px solid var(--line);
  }

  .page-faq .faq-nav__link {
    width: 100%;
    padding: 11px 14px 11px 16px;
    border: 0;
    border-left: 2px solid transparent;
    background: transparent;
    white-space: normal;
    line-height: 1.45;
  }

  .page-faq .faq-nav__link:hover {
    background: var(--ink-700);
  }

  .page-faq .faq-nav__link.is-active {
    border-left-color: var(--cyan);
    background: var(--ink-700);
    color: var(--white);
  }

  .page-faq .faq-section {
    scroll-margin-top: 96px;
  }
}

/* ---------- 减少动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-card[open] .faq-card__a {
    animation: none;
  }

  .page-faq .faq-card__q,
  .page-faq .faq-card__q::after,
  .page-faq .faq-nav__link {
    transition: none;
  }
}