.page-faq {
  --faq-index-w: 236px;
  --faq-gap: clamp(24px, 4vw, 56px);
  --faq-sticky-top: 104px;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  padding: clamp(28px, 5vw, 64px) 0 clamp(24px, 4vw, 48px);
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 48px);
  align-items: center;
}

.page-faq .faq-hero-copy .crumbs {
  margin-bottom: 14px;
}

.page-faq .faq-hero-copy h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 6.4vw, 60px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--paper);
  margin: 0 0 18px;
  max-width: 18ch;
}

.page-faq .faq-hero-copy .lead {
  max-width: 46ch;
  margin: 0 0 22px;
  color: var(--slate);
  font-size: 16px;
  line-height: 1.85;
}

.page-faq .faq-hero-meta {
  list-style: none;
  margin: 0;
  padding: 16px 0 0;
  border-top: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  gap: 10px 26px;
  font-size: 14px;
  color: var(--slate);
}

.page-faq .faq-hero-meta .mono-text {
  color: var(--cyan);
  font-size: 15px;
}

.page-faq .faq-hero-media {
  margin: 0;
  position: relative;
}

.page-faq .faq-hero-media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 7 / 4;
  object-fit: cover;
  clip-path: polygon(0 0, 100% 0, 100% 88%, 0 100%);
  border: 1px solid var(--line);
}

.page-faq .faq-hero-media::before {
  content: "";
  position: absolute;
  right: -12px;
  bottom: -12px;
  width: 54%;
  height: 54%;
  border-right: 1px solid var(--cyan);
  border-bottom: 1px solid var(--cyan);
  opacity: 0.45;
  pointer-events: none;
}

/* ---------- 主体左右分屏 ---------- */
.page-faq .faq-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 48px);
  padding-top: clamp(28px, 4vw, 56px);
  padding-bottom: clamp(48px, 8vw, 96px);
}

/* 左侧分类索引 */
.page-faq .faq-index-title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--mute);
}

.page-faq .faq-index-nav {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 8px;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.page-faq .faq-index-nav a {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--slate);
  font-size: 14px;
  line-height: 1.4;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
}

.page-faq .faq-index-nav a .mono-text {
  font-size: 11px;
  color: var(--violet);
}

.page-faq .faq-index-nav a:hover,
.page-faq .faq-index-nav a:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan);
  background-color: rgba(44, 232, 216, 0.06);
}

.page-faq .faq-index-nav a:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

/* ---------- 问答分组 ---------- */
.page-faq .faq-group {
  scroll-margin-top: var(--faq-sticky-top);
  padding-top: clamp(28px, 4vw, 52px);
}

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

.page-faq .faq-group + .faq-group {
  border-top: 1px solid var(--line);
  margin-top: clamp(28px, 4vw, 52px);
}

.page-faq .faq-group-head {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 12px;
}

.page-faq .faq-group-num {
  flex: 0 0 auto;
  font-size: 12px;
  color: var(--violet);
  border: 1px solid var(--violet);
  border-radius: var(--radius);
  padding: 3px 8px;
  line-height: 1.2;
}

.page-faq .faq-group-title {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: clamp(21px, 3.2vw, 30px);
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-faq .faq-group-lead {
  margin: 0 0 clamp(16px, 2.4vw, 26px);
  max-width: 60ch;
  color: var(--slate);
  font-size: 15px;
  line-height: 1.85;
}

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

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

.page-faq .collapse-trigger {
  width: 100%;
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 18px 2px;
  background: none;
  border: 0;
  color: var(--paper);
  font-family: var(--font-heading);
  font-size: 16px;
  font-weight: 600;
  line-height: 1.6;
  text-align: left;
  cursor: pointer;
  transition: color 0.2s ease;
}

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

.page-faq .collapse-trigger:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -2px;
}

.page-faq .q-mark {
  flex: 0 0 auto;
  font-size: 12px;
  color: var(--mute);
  padding-top: 5px;
  transition: color 0.2s ease;
}

.page-faq .collapse[data-open] .q-mark,
.page-faq .collapse.is-open .q-mark {
  color: var(--cyan);
}

.page-faq .q-text {
  flex: 1 1 auto;
  min-width: 0;
}

.page-faq .q-sign {
  flex: 0 0 auto;
  position: relative;
  width: 14px;
  height: 14px;
  margin-top: 7px;
}

.page-faq .q-sign::before,
.page-faq .q-sign::after {
  content: "";
  position: absolute;
  background-color: var(--slate);
  transition: transform 0.25s ease, background-color 0.25s ease;
}

.page-faq .q-sign::before {
  left: 0;
  top: 6px;
  width: 14px;
  height: 1.5px;
}

.page-faq .q-sign::after {
  left: 6px;
  top: 0;
  width: 1.5px;
  height: 14px;
}

.page-faq .collapse[data-open] .q-sign::before,
.page-faq .collapse.is-open .q-sign::before {
  background-color: var(--cyan);
}

.page-faq .collapse[data-open] .q-sign::after,
.page-faq .collapse.is-open .q-sign::after {
  transform: rotate(90deg);
  opacity: 0;
}

.page-faq .collapse-panel {
  padding: 0 2px 22px;
}

.page-faq .collapse-panel p {
  margin: 0;
  max-width: 62ch;
  color: var(--slate);
  font-size: 15px;
  line-height: 1.9;
}

.page-faq .collapse-panel strong {
  color: var(--paper);
  font-weight: 600;
}

/* ---------- 组内配图 ---------- */
.page-faq .faq-inline-media {
  margin: 0 0 clamp(18px, 3vw, 30px);
  border: 1px solid var(--line);
  position: relative;
}

.page-faq .faq-inline-media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

/* ---------- 两步路径示意 ---------- */
.page-faq .faq-path {
  margin: 0 0 clamp(18px, 3vw, 28px);
  padding: 18px 16px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background-image: linear-gradient(155deg, rgba(16, 26, 68, 0.92), rgba(7, 14, 36, 0.55));
}

.page-faq .faq-path-svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-faq .faq-path-line {
  stroke: var(--line);
  stroke-width: 1.5;
}

.page-faq .faq-path-arrow {
  fill: none;
  stroke: var(--cyan);
  stroke-width: 1.5;
  stroke-linecap: square;
  stroke-linejoin: miter;
}

.page-faq .faq-path-node {
  fill: none;
  stroke: var(--line);
  stroke-width: 1.5;
}

.page-faq .faq-path-node--alt {
  stroke: var(--violet);
}

.page-faq .faq-path-node--end {
  stroke: var(--cyan);
}

.page-faq .faq-path-step {
  font-family: var(--font-mono);
  font-size: 22px;
  fill: var(--paper);
}

.page-faq .faq-path-caption {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.8;
  color: var(--mute);
}

/* ---------- 联系入口 ---------- */
.page-faq .faq-contact-link {
  margin: clamp(20px, 3vw, 30px) 0 0;
}

/* ---------- 返回顶部 ---------- */
.page-faq .faq-top {
  position: fixed;
  right: clamp(14px, 3vw, 30px);
  bottom: clamp(14px, 3vw, 30px);
  z-index: 30;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 15px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background-color: rgba(7, 14, 36, 0.9);
  color: var(--slate);
  font-family: var(--font-mono);
  font-size: 12px;
  text-decoration: none;
  backdrop-filter: blur(6px);
  transition: color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.page-faq .faq-top:hover,
.page-faq .faq-top:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan);
  transform: translateY(-2px);
}

.page-faq .faq-top:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

/* ---------- 平板与桌面 ---------- */
@media (min-width: 900px) {
  .page-faq .faq-hero-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: clamp(32px, 5vw, 72px);
  }

  .page-faq .faq-body {
    grid-template-columns: var(--faq-index-w) minmax(0, 1fr);
    gap: clamp(32px, 5vw, 72px);
  }

  .page-faq .faq-index {
    position: sticky;
    top: var(--faq-sticky-top);
    align-self: start;
  }

  .page-faq .faq-index-nav {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-faq .faq-index-nav a {
    border: 0;
    border-left: 2px solid var(--line);
    border-radius: 0;
    padding: 10px 6px 10px 14px;
    white-space: normal;
    font-size: 15px;
  }

  .page-faq .faq-index-nav a:hover,
  .page-faq .faq-index-nav a:focus-visible {
    background-color: rgba(44, 232, 216, 0.05);
  }

  .page-faq .faq-group-head {
    gap: 16px;
  }

  .page-faq .collapse-trigger {
    font-size: 17px;
    padding: 20px 2px;
  }

  .page-faq .collapse-panel {
    padding-left: 32px;
    padding-bottom: 26px;
  }
}

@media (min-width: 1240px) {
  .page-faq .faq-group-lead {
    font-size: 16px;
  }
}

/* ---------- 减弱动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-index-nav a,
  .page-faq .collapse-trigger,
  .page-faq .q-sign::before,
  .page-faq .q-sign::after,
  .page-faq .faq-top {
    transition: none;
  }
}