.page-faq {
  background: var(--paper-050);
  color: var(--text-dark);
}

/* ---------- Hero ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: 26px 0 56px;
  background: var(--ink-900);
  color: var(--on-dark);
}

.page-faq .faq-hero-wedge {
  position: absolute;
  right: -18%;
  bottom: -34%;
  width: 88%;
  height: 96%;
  background: linear-gradient(130deg, var(--ink-800), var(--cyan-700));
  opacity: .34;
  clip-path: polygon(0 100%, 100% 0, 100% 100%);
  pointer-events: none;
}

.page-faq .faq-hero-grid {
  position: relative;
  display: grid;
  gap: 34px;
}

.page-faq .faq-hero .breadcrumbs {
  margin: 0 0 22px;
}

.page-faq .faq-hero .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--on-dark-dim);
}

.page-faq .faq-hero .breadcrumb-list a {
  color: var(--on-dark-dim);
  text-decoration: none;
}

.page-faq .faq-hero .breadcrumb-list a:hover {
  color: var(--cyan-500);
}

.page-faq .faq-hero .breadcrumb-list li + li::before {
  content: "/";
  margin-right: 8px;
  opacity: .45;
}

.page-faq .faq-hero .breadcrumb-list [aria-current="page"] {
  color: var(--cyan-500);
}

.page-faq .faq-hero .eyebrow {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .18em;
  color: var(--gold-400);
}

.page-faq .faq-hero h1 {
  margin: 0 0 20px;
  font-size: clamp(28px, 6.2vw, 54px);
  line-height: 1.14;
  letter-spacing: -.015em;
  color: #FFFFFF;
}

.page-faq .faq-hero-lead {
  max-width: 40em;
  margin: 0 0 30px;
  font-size: 17px;
  line-height: 1.85;
  color: var(--on-dark);
}

.page-faq .faq-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 16px 40px;
  margin: 0;
  padding: 20px 0 0;
  border-top: 1px solid var(--line-dark);
  list-style: none;
}

.page-faq .faq-stats li {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.page-faq .faq-stat-num {
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  color: var(--gold-400);
}

.page-faq .faq-stat-label {
  font-size: 14px;
  color: var(--on-dark-dim);
}

.page-faq .faq-hero-frame {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line-dark);
  border-radius: var(--radius-lg);
  aspect-ratio: 4 / 3;
}

.page-faq .media-frame img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ---------- 主体两栏 ---------- */
.page-faq .faq-main {
  padding: 46px 0 0;
}

.page-faq .faq-layout {
  display: grid;
  gap: 26px;
}

/* ---------- 左侧索引 ---------- */
.page-faq .faq-rail {
  padding: 18px 18px 20px;
  background: var(--ink-900);
  border-radius: var(--radius-lg);
}

.page-faq .faq-rail-title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--gold-400);
}

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

.page-faq .faq-rail-list li {
  flex: 0 0 auto;
}

.page-faq .faq-rail-link {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 9px 15px;
  border: 1px solid var(--line-dark);
  border-radius: var(--radius-pill);
  font-size: 14px;
  white-space: nowrap;
  color: var(--on-dark);
  text-decoration: none;
  transition: border-color .22s var(--ease), color .22s var(--ease), background-color .22s var(--ease);
}

.page-faq .faq-rail-link .mono {
  font-size: 12px;
  color: var(--gold-400);
}

.page-faq .faq-rail-link:hover,
.page-faq .faq-rail-link:focus-visible {
  border-color: var(--cyan-500);
  color: var(--cyan-500);
}

/* ---------- 工具条 ---------- */
.page-faq .faq-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 18px;
  margin-bottom: 4px;
  border-bottom: 1px solid var(--line-light);
}

.page-faq .filter-count {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--muted);
}

/* ---------- 分组 ---------- */
.page-faq .faq-group {
  padding: 36px 0 6px;
  scroll-margin-top: 104px;
}

.page-faq .faq-group-head {
  margin-bottom: 12px;
}

.page-faq .faq-group-title {
  display: flex;
  align-items: center;
  margin: 0 0 8px;
  font-size: clamp(21px, 3.6vw, 29px);
  line-height: 1.3;
  letter-spacing: -.01em;
  color: var(--ink-900);
}

.page-faq .faq-group-title::before {
  content: "";
  flex: 0 0 auto;
  width: 10px;
  height: 10px;
  margin-right: 12px;
  border-radius: 50%;
  background: var(--cyan-500);
}

.page-faq .faq-group-note {
  max-width: 46em;
  margin: 0 0 6px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 折叠条目 ---------- */
.page-faq .faq-item {
  border-bottom: 1px solid var(--line-light);
}

.page-faq .faq-q {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
  padding: 20px 4px;
  list-style: none;
  cursor: pointer;
  font-size: 17px;
  font-weight: 500;
  line-height: 1.6;
  color: var(--text-dark);
  transition: color .22s var(--ease);
}

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

.page-faq .faq-q:hover,
.page-faq .faq-q:focus-visible {
  color: var(--cyan-700);
}

.page-faq .faq-q-mark {
  position: relative;
  flex: 0 0 auto;
  width: 22px;
  height: 22px;
  margin-top: 3px;
  border: 1px solid var(--line-light);
  border-radius: 50%;
  transition: background-color .24s var(--ease), border-color .24s var(--ease);
}

.page-faq .faq-q-mark::before,
.page-faq .faq-q-mark::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  width: 10px;
  height: 2px;
  border-radius: 2px;
  background: var(--ink-600);
  transform: translate(-50%, -50%);
  transition: transform .24s var(--ease), background-color .24s var(--ease);
}

.page-faq .faq-q-mark::after {
  transform: translate(-50%, -50%) rotate(90deg);
}

.page-faq .faq-item[open] .faq-q-mark {
  background: var(--cyan-500);
  border-color: var(--cyan-500);
}

.page-faq .faq-item[open] .faq-q-mark::before,
.page-faq .faq-item[open] .faq-q-mark::after {
  background: var(--ink-900);
}

.page-faq .faq-item[open] .faq-q-mark::after {
  transform: translate(-50%, -50%) rotate(0deg);
}

.page-faq .faq-a {
  max-width: 46em;
  padding: 0 4px 24px;
}

.page-faq .faq-a p {
  margin: 0 0 12px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-800);
}

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

.page-faq .faq-a .mono {
  padding: 2px 7px;
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--ink-900);
  background: rgba(43, 232, 200, .18);
}

/* ---------- 支持区 ---------- */
.page-faq .faq-support {
  position: relative;
  overflow: hidden;
  margin-top: 62px;
  padding: 56px 0 62px;
  background: var(--ink-800);
  color: var(--on-dark);
}

.page-faq .faq-support::after {
  content: "";
  position: absolute;
  right: -12%;
  top: -30%;
  width: 46%;
  height: 160%;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(43, 232, 200, .16), transparent 70%);
  pointer-events: none;
}

.page-faq .faq-support-grid {
  position: relative;
  display: grid;
  gap: 34px;
}

.page-faq .faq-support .eyebrow {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .18em;
  color: var(--gold-400);
}

.page-faq .faq-support h2 {
  margin: 0 0 18px;
  font-size: clamp(24px, 4.4vw, 38px);
  line-height: 1.2;
  letter-spacing: -.015em;
  color: #FFFFFF;
}

.page-faq .faq-support p {
  max-width: 40em;
  margin: 0 0 14px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--on-dark);
}

.page-faq .faq-support-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px 24px;
  margin-top: 24px;
}

.page-faq .faq-support-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 15px;
  color: var(--cyan-500);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color .22s var(--ease);
}

.page-faq .faq-support-link:hover,
.page-faq .faq-support-link:focus-visible {
  border-bottom-color: var(--cyan-500);
}

.page-faq .faq-support-frame {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line-dark);
  border-radius: var(--radius-lg);
  aspect-ratio: 4 / 3;
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-faq .faq-hero {
    padding: 34px 0 66px;
  }

  .page-faq .faq-main {
    padding-top: 58px;
  }

  .page-faq .faq-rail {
    padding: 22px 22px 24px;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero-grid {
    grid-template-columns: minmax(0, 1.18fr) minmax(0, .82fr);
    align-items: end;
    gap: 56px;
  }

  .page-faq .faq-layout {
    grid-template-columns: 240px minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: 96px;
    padding: 22px 20px 24px;
  }

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

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

  .page-faq .faq-rail-link {
    padding: 10px 12px;
    border-color: transparent;
    border-radius: var(--radius-md);
  }

  .page-faq .faq-rail-link:hover,
  .page-faq .faq-rail-link:focus-visible {
    background: rgba(43, 232, 200, .09);
    border-color: transparent;
  }

  .page-faq .faq-support {
    margin-top: 78px;
    padding: 72px 0 78px;
  }

  .page-faq .faq-support-grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
    align-items: center;
    gap: 60px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-q,
  .page-faq .faq-rail-link,
  .page-faq .faq-q-mark,
  .page-faq .faq-q-mark::before,
  .page-faq .faq-q-mark::after,
  .page-faq .faq-support-link {
    transition: none;
  }
}