.page-faq {
  --faq-rail-w: 216px;
  --faq-line: var(--line);
  background: linear-gradient(180deg, #08121e 0%, var(--bg) 420px);
  color: var(--ink);
  font-family: var(--sans);
  padding-bottom: 48px;
}

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

.page-faq .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--ink-2);
}

.page-faq .breadcrumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--line-soft);
}

.page-faq .breadcrumb a {
  color: var(--cyan);
  text-decoration: none;
}

.page-faq .breadcrumb a:hover,
.page-faq .breadcrumb a:focus-visible {
  text-decoration: underline;
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  padding: 22px 0 34px;
}

.page-faq .faq-hero-grid {
  display: grid;
  gap: 28px;
}

.page-faq .faq-hero-lead {
  max-width: 62ch;
}

.page-faq .faq-hero .eyebrow,
.page-faq .faq-outreach .eyebrow {
  margin: 0 0 12px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-faq h1 {
  margin: 0 0 16px;
  max-width: 17ch;
  font-size: clamp(30px, 8vw, 56px);
  font-weight: 900;
  font-stretch: 87%;
  line-height: 1.06;
  letter-spacing: -.015em;
}

.page-faq .faq-hero-lede {
  margin: 0;
  max-width: 46ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-2);
}

.page-faq .faq-stats {
  margin: 0;
  padding: 0;
  list-style: none;
  border: 2px solid var(--faq-line);
  background: var(--surface);
  box-shadow: var(--shadow-hard);
}

.page-faq .faq-stat {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 15px 18px;
  border-top: 1px solid var(--line-soft);
}

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

.page-faq .faq-stat-num {
  flex: 0 0 auto;
  min-width: 3.6ch;
  font-family: var(--mono);
  font-size: clamp(28px, 6vw, 38px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: .02em;
  color: var(--cyan);
}

.page-faq .faq-stat:nth-child(2) .faq-stat-num {
  color: var(--orange);
}

.page-faq .faq-stat:nth-child(3) .faq-stat-num {
  color: var(--lime);
}

.page-faq .faq-stat-label {
  font-size: 13.5px;
  line-height: 1.55;
  color: var(--ink-2);
}

/* ---------- 主体两栏 ---------- */

.page-faq .faq-layout {
  display: grid;
  gap: 0;
}

.page-faq .faq-main {
  min-width: 0;
}

/* 左侧编号轨道 */

.page-faq .faq-rail {
  margin-bottom: 30px;
  padding: 18px 16px;
  border: 2px solid var(--faq-line);
  background: var(--surface);
  box-shadow: var(--shadow-soft);
}

.page-faq .rail-title {
  margin: 0 0 12px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--ink-2);
}

.page-faq .rail-nav {
  display: grid;
  gap: 4px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .rail-nav-link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 7px 9px;
  border-left: 2px solid transparent;
  color: var(--ink);
  text-decoration: none;
  transition: border-color .18s var(--ease), background-color .18s var(--ease);
}

.page-faq .rail-nav-link:hover,
.page-faq .rail-nav-link:focus-visible {
  border-left-color: var(--orange);
  background: rgba(47, 216, 208, .07);
}

.page-faq .rail-nav-num {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--orange);
}

.page-faq .rail-nav-text {
  font-size: 14px;
  line-height: 1.5;
}

.page-faq .rail-note {
  margin: 16px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--line-soft);
  font-size: 12.5px;
  line-height: 1.75;
  color: var(--ink-2);
}

/* ---------- 问答组 ---------- */

.page-faq .faq-group {
  padding: 30px 0 8px;
}

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

.page-faq .faq-group-head {
  display: grid;
  gap: 8px;
  margin-bottom: 18px;
}

.page-faq .faq-group-num {
  font-family: var(--mono);
  font-size: 40px;
  line-height: .85;
  letter-spacing: -.02em;
  color: var(--line-soft);
}

.page-faq .faq-group h2 {
  margin: 0;
  font-size: clamp(21px, 5vw, 30px);
  font-weight: 900;
  font-stretch: 87%;
  line-height: 1.16;
  letter-spacing: -.01em;
}

.page-faq .faq-group-desc {
  margin: 0;
  max-width: 52ch;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-2);
}

/* 折叠问答 */

.page-faq .accordion {
  border: 2px solid var(--faq-line);
  background: var(--surface);
  box-shadow: var(--shadow-soft);
}

.page-faq .accordion .acc-item + .acc-item {
  border-top: 1px solid var(--line-soft);
}

.page-faq .accordion .acc-trigger {
  width: 100%;
  align-items: flex-start;
  gap: 14px;
  padding: 16px;
  border: 0;
  background: transparent;
  color: var(--ink);
  font-family: inherit;
  font-size: 16px;
  line-height: 1.6;
  text-align: left;
  cursor: pointer;
  transition: background-color .18s var(--ease);
}

.page-faq .accordion .acc-trigger:hover,
.page-faq .accordion .acc-trigger:focus-visible {
  background: rgba(47, 216, 208, .06);
}

.page-faq .accordion .acc-trigger[aria-expanded="true"] {
  background: rgba(255, 106, 43, .08);
}

.page-faq .accordion .acc-index {
  flex: 0 0 auto;
  min-width: 30px;
  padding-top: 4px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--orange);
}

.page-faq .accordion .acc-text {
  flex: 1 1 auto;
  font-weight: 600;
}

.page-faq .accordion .acc-trigger[aria-expanded="true"] .acc-text {
  color: var(--cyan);
}

.page-faq .accordion .acc-trigger[aria-expanded="true"] .acc-index {
  color: var(--lime);
}

.page-faq .accordion .acc-panel-inner {
  padding: 0 16px 18px 16px;
}

.page-faq .accordion .acc-panel-inner p {
  margin: 0 0 10px;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-2);
}

.page-faq .accordion .acc-panel-inner p:last-child {
  margin-bottom: 0;
}

.page-faq .accordion .acc-panel-inner a {
  color: var(--cyan);
  text-underline-offset: 3px;
}

/* ---------- 插图 ---------- */

.page-faq .faq-figure {
  margin: 26px 0 0;
}

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

.page-faq .faq-figure .media-caption {
  margin-top: 10px;
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: .02em;
  line-height: 1.7;
  color: var(--ink-2);
}

/* ---------- 底部引导 ---------- */

.page-faq .faq-outreach {
  margin-top: 40px;
  padding: 26px 22px;
  border: 2px solid var(--faq-line);
  border-left: 6px solid var(--orange);
  background: var(--surface);
  box-shadow: var(--shadow-hard);
}

.page-faq .faq-outreach h2 {
  margin: 0 0 12px;
  max-width: 24ch;
  font-size: clamp(20px, 4.6vw, 27px);
  font-weight: 900;
  font-stretch: 87%;
  line-height: 1.22;
}

.page-faq .faq-outreach p {
  margin: 0 0 20px;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-2);
}

.page-faq .faq-outreach-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */

@media (min-width: 600px) {
  .page-faq .accordion .acc-trigger {
    padding: 18px 20px;
  }

  .page-faq .accordion .acc-panel-inner {
    padding: 0 20px 20px 64px;
  }

  .page-faq .faq-group-head {
    grid-template-columns: 84px minmax(0, 1fr);
    grid-template-rows: auto auto;
    column-gap: 18px;
    align-items: start;
  }

  .page-faq .faq-group-num {
    grid-row: 1 / span 2;
    padding-top: 2px;
  }

  .page-faq .faq-group-desc {
    font-size: 14.5px;
  }

  .page-faq .faq-outreach {
    padding: 32px 30px;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero {
    padding: 28px 0 46px;
  }

  .page-faq .faq-hero-grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(280px, .8fr);
    gap: 48px;
    align-items: end;
  }

  .page-faq .faq-stats {
    margin-bottom: 6px;
  }
}

@media (min-width: 1024px) {
  .page-faq .faq-layout {
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
    gap: 48px;
    align-items: start;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: calc(var(--mast-h) + 24px);
    margin-bottom: 0;
  }

  .page-faq .faq-group {
    padding-top: 34px;
  }

  .page-faq .faq-group:first-child {
    padding-top: 6px;
  }

  .page-faq .faq-group-num {
    font-size: 46px;
  }

  .page-faq .faq-main .faq-outreach {
    margin-top: 46px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .rail-nav-link,
  .page-faq .accordion .acc-trigger {
    transition: none;
  }
}