.page-faq {
  --faq-line: 2px;
  --faq-rail: 248px;
}

.page-faq .breadcrumbs {
  margin-top: clamp(16px, 2.4vw, 28px);
}

/* ---------- 首屏 ---------- */

.page-faq .hero-shell {
  position: relative;
  overflow: hidden;
  padding: clamp(28px, 5vw, 64px) 0 clamp(26px, 4vw, 48px);
  border-bottom: 1px solid var(--line);
}

.page-faq .hero-shell::before {
  content: "";
  position: absolute;
  right: -90px;
  top: -140px;
  width: clamp(200px, 30vw, 420px);
  height: 170%;
  background: linear-gradient(200deg, rgba(10, 110, 138, .12), rgba(245, 197, 24, .16));
  transform: skewX(var(--skew));
  pointer-events: none;
}

.page-faq .hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 56px);
}

.page-faq .hero-copy h1 {
  margin: 12px 0 0;
  max-width: 19ch;
  font-size: clamp(30px, 6.6vw, 58px);
  line-height: 1.06;
  letter-spacing: -.02em;
  font-weight: 800;
  color: var(--ink);
}

.page-faq .hero-copy .lead {
  margin: 18px 0 0;
  max-width: 58ch;
  color: var(--graphite);
}

.page-faq .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-faq .hero-facts {
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border-top: 2px solid var(--ink);
}

.page-faq .fact {
  display: grid;
  gap: 5px;
  padding: 15px 16px;
  background: var(--snow);
}

.page-faq .fact__value {
  font-size: clamp(24px, 3.4vw, 36px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.01em;
  color: var(--lake);
}

.page-faq .fact__label {
  font-size: 13px;
  line-height: 1.6;
  color: var(--graphite);
}

/* ---------- 目录 + 问答双栏 ---------- */

.page-faq .qa-shell {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 56px);
  padding-top: clamp(32px, 5vw, 62px);
  padding-bottom: clamp(40px, 6vw, 82px);
}

.page-faq .qa-rail {
  min-width: 0;
}

.page-faq .rail-title {
  margin: 0 0 12px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--ink);
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--graphite);
}

.page-faq .rail-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-faq .rail-list li {
  border-bottom: 1px solid var(--line-soft);
}

.page-faq .rail-list a {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 10px;
  align-items: baseline;
  padding: 11px 0;
  font-size: 14px;
  line-height: 1.5;
  color: var(--graphite);
  text-decoration: none;
  transition: color .16s var(--ease), transform .16s var(--ease);
}

.page-faq .rail-list .mono {
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--amber);
}

.page-faq .rail-list a:hover,
.page-faq .rail-list a:focus-visible {
  color: var(--lake);
  transform: translateX(4px);
}

.page-faq .rail-note {
  margin: 16px 0 0;
  padding-left: 12px;
  border-left: var(--faq-line) solid var(--rape);
  font-size: 13px;
  line-height: 1.7;
  color: var(--graphite);
}

.page-faq .qa-flow {
  min-width: 0;
  display: grid;
  gap: clamp(34px, 5vw, 62px);
}

/* ---------- 章节头 ---------- */

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

.page-faq .qa-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 4px 16px;
  align-items: start;
  margin-bottom: 14px;
}

.page-faq .qa-num {
  grid-row: span 2;
  align-self: start;
  padding: 5px 8px;
  background: var(--lake);
  color: var(--snow);
  font-size: 12px;
  letter-spacing: .1em;
  line-height: 1.2;
}

.page-faq .qa-title {
  margin: 0;
  font-size: clamp(21px, 3.2vw, 30px);
  line-height: 1.22;
  letter-spacing: -.01em;
  font-weight: 800;
  color: var(--ink);
}

.page-faq .qa-desc {
  grid-column: 2;
  margin: 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--graphite);
}

/* ---------- 折叠问答 ---------- */

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

.page-faq .qa-item {
  border-top: 1px solid var(--line);
  transition: background-color .16s var(--ease);
}

.page-faq .qa-item summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding: 16px 12px;
  list-style: none;
  cursor: pointer;
  font-size: 17px;
  font-weight: 600;
  line-height: 1.6;
  color: var(--ink);
  transition: color .16s var(--ease), background-color .16s var(--ease);
}

.page-faq .qa-item summary::-webkit-details-marker {
  display: none;
}

.page-faq .qa-item summary::marker {
  content: "";
}

.page-faq .qa-item summary:hover {
  color: var(--lake);
  background: var(--fog);
}

.page-faq .qa-item summary:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: -2px;
}

.page-faq .qa-item[open] > summary {
  color: var(--lake);
}

.page-faq .qa-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 32px;
  height: 26px;
  padding: 0 7px;
  background: var(--rape);
  color: var(--ink);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .04em;
  line-height: 1;
  transition: background-color .12s var(--ease), color .12s var(--ease);
}

.page-faq .qa-item[open] > summary .qa-mark {
  background: var(--lake);
  color: var(--snow);
}

.page-faq .qa-body {
  position: relative;
  padding: 0 12px 20px 58px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink);
}

.page-faq .qa-body::before {
  content: "";
  position: absolute;
  left: 28px;
  top: 2px;
  bottom: 22px;
  width: var(--faq-line);
  background: linear-gradient(180deg, var(--lake), rgba(10, 110, 138, .12));
}

.page-faq .qa-body p {
  margin: 0 0 12px;
}

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

.page-faq .qa-body a {
  color: var(--amber);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.page-faq .qa-body a:hover {
  color: var(--lake);
}

/* ---------- 插图 ---------- */

.page-faq .qa-figure {
  margin: 24px 0 4px;
  padding: 0;
}

.page-faq .qa-figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--line);
}

.page-faq .qa-figure .media-caption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--graphite);
}

/* ---------- 联系卡片 ---------- */

.page-faq .reach-card {
  position: relative;
  overflow: hidden;
  margin-top: 22px;
  padding: clamp(22px, 3.4vw, 40px);
  background: var(--lake-deep);
  color: var(--snow);
}

.page-faq .reach-card::after {
  content: "";
  position: absolute;
  right: -70px;
  bottom: -80px;
  width: 220px;
  height: 220px;
  border: 1px solid rgba(214, 237, 243, .22);
  transform: rotate(45deg);
  pointer-events: none;
}

.page-faq .reach-card h3 {
  position: relative;
  margin: 0 0 12px;
  font-size: clamp(18px, 2.6vw, 24px);
  line-height: 1.3;
  letter-spacing: -.01em;
  font-weight: 700;
  color: var(--snow);
}

.page-faq .reach-card p {
  position: relative;
  margin: 0;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(255, 255, 255, .82);
}

.page-faq .reach-card p a {
  color: var(--rape);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-faq .reach-card p a:hover {
  color: var(--snow);
}

.page-faq .reach-meta {
  position: relative;
  z-index: 1;
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: rgba(214, 237, 243, .2);
  border: 1px solid rgba(214, 237, 243, .2);
}

.page-faq .reach-meta li {
  display: grid;
  grid-template-columns: 76px minmax(0, 1fr);
  gap: 12px;
  padding: 13px 16px;
  background: var(--lake-deep);
  font-size: 15px;
  line-height: 1.7;
}

.page-faq .reach-meta .k {
  align-self: center;
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--rape);
}

.page-faq .reach-meta .v {
  color: var(--snow);
  word-break: break-word;
}

.page-faq .reach-actions {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

/* ---------- 响应式 ---------- */

@media (min-width: 768px) {
  .page-faq .hero-facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 1024px) {
  .page-faq .hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: end;
  }

  .page-faq .hero-facts {
    grid-template-columns: 1fr;
  }

  .page-faq .qa-shell {
    grid-template-columns: var(--faq-rail) minmax(0, 1fr);
    gap: clamp(40px, 5vw, 72px);
  }

  .page-faq .qa-rail {
    position: sticky;
    top: 84px;
    align-self: start;
  }
}

@media (max-width: 640px) {
  .page-faq .qa-item summary {
    padding: 14px 4px;
    gap: 10px;
    font-size: 16px;
  }

  .page-faq .qa-body {
    padding: 0 4px 18px 42px;
    font-size: 15.5px;
  }

  .page-faq .qa-body::before {
    left: 18px;
  }

  .page-faq .qa-head {
    gap: 4px 12px;
  }

  .page-faq .reach-meta li {
    grid-template-columns: 1fr;
    gap: 4px;
  }
}