.page-faq {
  --faq-hair: rgba(43, 52, 68, 0.78);
  --faq-hair-soft: rgba(43, 52, 68, 0.4);
  --faq-gridline: rgba(43, 52, 68, 0.34);
  --faq-open-bg: linear-gradient(180deg, rgba(58, 30, 14, 0.52), rgba(16, 20, 28, 0.7));
  --faq-closed-bg: linear-gradient(180deg, rgba(16, 20, 28, 0.92), rgba(16, 20, 28, 0.6));
  padding-bottom: clamp(40px, 6vw, 72px);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(36px, 6vw, 78px) clamp(34px, 5vw, 60px);
  border-bottom: 1px solid var(--faq-hair);
  background-image:
    linear-gradient(to right, var(--faq-gridline) 1px, transparent 1px),
    linear-gradient(to bottom, var(--faq-gridline) 1px, transparent 1px),
    radial-gradient(120% 100% at 86% 0%, rgba(47, 107, 255, 0.16), transparent 62%),
    radial-gradient(90% 90% at 4% 100%, rgba(255, 106, 26, 0.09), transparent 58%);
  background-size: 72px 72px, 72px 72px, 100% 100%, 100% 100%;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  top: -40%;
  right: -14%;
  width: min(460px, 70vw);
  aspect-ratio: 1;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 106, 26, 0.16), transparent 66%);
  pointer-events: none;
}

.page-faq .hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(26px, 4vw, 46px);
}

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

.page-faq .hero-copy .headline {
  margin: 12px 0 0;
  font-size: clamp(28px, 5.4vw, 46px);
  line-height: 1.14;
}

.page-faq .hero-copy .lead {
  margin-top: 18px;
}

/* 主题胶囊 */
.page-faq .faq-tabs {
  display: flex;
  flex-wrap: nowrap;
  gap: 10px;
  margin-top: 26px;
  padding-bottom: 6px;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.page-faq .faq-tabs::-webkit-scrollbar {
  display: none;
}

.page-faq .faq-tab {
  flex: none;
  white-space: nowrap;
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  transition: border-color 0.28s var(--ease), color 0.28s var(--ease),
    background-color 0.28s var(--ease), transform 0.28s var(--ease);
}

.page-faq .faq-tab:hover,
.page-faq .faq-tab:focus-visible {
  border-color: var(--orange);
  color: var(--orange);
  transform: translateY(-1px);
}

/* 首屏统计 */
.page-faq .hero-stats {
  position: relative;
  display: grid;
  gap: 13px;
  margin: 0;
  padding: 20px 22px 20px 24px;
  list-style: none;
  border: 1px solid var(--faq-hair);
  border-radius: var(--radius-lg);
  background: rgba(16, 20, 28, 0.86);
  overflow: hidden;
}

.page-faq .hero-stats::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 3px;
  background: linear-gradient(180deg, var(--orange), var(--blue));
}

.page-faq .stat {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding-bottom: 12px;
  border-bottom: 1px dashed var(--faq-hair-soft);
}

.page-faq .stat:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

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

.page-faq .stat-num {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--orange);
}

/* ---------- 主体布局 ---------- */
.page-faq .faq-body {
  display: grid;
  gap: clamp(30px, 4vw, 52px);
  padding-block: clamp(38px, 5vw, 68px) clamp(20px, 3vw, 40px);
}

.page-faq .faq-index {
  display: none;
}

/* ---------- 分组 ---------- */
.page-faq .faq-stack {
  min-width: 0;
}

.page-faq .faq-group {
  scroll-margin-top: calc(var(--header-h) + 26px);
  margin-top: clamp(34px, 5vw, 56px);
  padding-top: clamp(26px, 3.4vw, 38px);
  border-top: 1px solid var(--faq-hair);
}

.page-faq .faq-group:first-of-type {
  margin-top: 0;
  padding-top: 0;
  border-top: 0;
}

.page-faq .group-head {
  display: grid;
  grid-template-columns: auto 1fr;
  column-gap: 14px;
  row-gap: 6px;
  align-items: baseline;
}

.page-faq .group-index {
  font-size: 13px;
  font-weight: 700;
  color: var(--orange);
  letter-spacing: 0.06em;
}

.page-faq .group-title {
  margin: 0;
  font-size: clamp(21px, 3.2vw, 30px);
  line-height: 1.22;
  letter-spacing: -0.01em;
}

.page-faq .group-sub {
  grid-column: 2;
  margin: 0;
  max-width: 58ch;
  font-size: 15px;
  color: var(--muted);
}

/* ---------- 配图 ---------- */
.page-faq .faq-figure {
  margin: 22px 0 0;
}

.page-faq .faq-figure--end {
  margin-bottom: 4px;
}

.page-faq .faq-figure .img-caption {
  margin-top: 10px;
  font-size: 13px;
  color: var(--muted);
}

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

/* ---------- 问答栈 ---------- */
.page-faq .qa-list {
  display: grid;
  gap: 10px;
  margin-top: 20px;
}

.page-faq .qa-item {
  border: 1px solid var(--faq-hair);
  border-radius: var(--radius-md);
  background: var(--faq-closed-bg);
  overflow: hidden;
  transition: border-color 0.3s var(--ease), box-shadow 0.3s var(--ease),
    background 0.3s var(--ease);
}

.page-faq .qa-item:hover {
  border-color: rgba(255, 106, 26, 0.34);
}

.page-faq .qa-item[open] {
  border-color: rgba(255, 106, 26, 0.44);
  background: var(--faq-open-bg);
  box-shadow: inset 3px 0 0 var(--orange);
}

.page-faq .qa-q {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 13px;
  padding: 15px 18px;
  cursor: pointer;
  list-style: none;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--white);
  transition: color 0.28s var(--ease);
}

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

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

.page-faq .qa-q:hover .qa-text {
  color: var(--orange);
}

.page-faq .qa-num {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--orange);
  opacity: 0.9;
}

.page-faq .qa-text {
  min-width: 0;
  transition: color 0.28s var(--ease);
}

.page-faq .qa-toggle {
  position: relative;
  width: 20px;
  height: 20px;
  flex: none;
  border: 1px solid var(--faq-hair);
  border-radius: var(--radius-pill);
  transition: border-color 0.28s var(--ease), background-color 0.28s var(--ease);
}

.page-faq .qa-toggle::before,
.page-faq .qa-toggle::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  background: var(--muted);
  transition: transform 0.32s var(--ease), background-color 0.28s var(--ease);
}

.page-faq .qa-toggle::before {
  width: 9px;
  height: 1.5px;
  transform: translate(-50%, -50%);
}

.page-faq .qa-toggle::after {
  width: 1.5px;
  height: 9px;
  transform: translate(-50%, -50%);
}

.page-faq .qa-item[open] .qa-toggle {
  border-color: rgba(255, 106, 26, 0.6);
  background: rgba(255, 106, 26, 0.14);
}

.page-faq .qa-item[open] .qa-toggle::before,
.page-faq .qa-item[open] .qa-toggle::after {
  background: var(--orange);
}

.page-faq .qa-item[open] .qa-toggle::after {
  transform: translate(-50%, -50%) scaleY(0);
}

.page-faq .qa-item[open] .qa-toggle::before {
  transform: translate(-50%, -50%) rotate(180deg);
}

.page-faq .qa-a {
  padding: 2px 18px 18px 50px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

.page-faq .qa-a p {
  margin: 0;
  max-width: 64ch;
}

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

@keyframes faq-reveal {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.page-faq .inline-link {
  color: var(--blue);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 107, 255, 0.45);
  transition: color 0.24s var(--ease), border-color 0.24s var(--ease);
}

.page-faq .inline-link:hover,
.page-faq .inline-link:focus-visible {
  color: var(--orange);
  border-bottom-color: var(--orange);
}

/* ---------- 收尾 CTA ---------- */
.page-faq .faq-cta {
  margin-top: clamp(40px, 5vw, 64px);
  padding: clamp(22px, 3vw, 32px);
  border-radius: var(--radius-lg);
}

.page-faq .cta-kicker {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--orange);
}

.page-faq .cta-text {
  margin: 12px 0 0;
  max-width: 56ch;
  font-size: 17px;
  line-height: 1.7;
  color: var(--white);
}

.page-faq .cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

.page-faq .faq-cta .btn {
  text-decoration: none;
}

/* ---------- 分隔脉冲条 ---------- */
.page-faq .pulse-divider {
  margin-top: clamp(32px, 5vw, 56px);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-faq .faq-tabs {
    flex-wrap: wrap;
    overflow-x: visible;
  }

  .page-faq .qa-q {
    font-size: 17px;
    padding: 17px 22px;
  }

  .page-faq .qa-a {
    padding: 2px 22px 20px 57px;
    font-size: 16px;
  }
}

@media (min-width: 900px) {
  .page-faq .hero-grid {
    grid-template-columns: minmax(0, 1.6fr) minmax(250px, 0.84fr);
    align-items: end;
  }

  .page-faq .hero-stats {
    padding: 22px 24px 22px 26px;
  }
}

@media (min-width: 1000px) {
  .page-faq .faq-body {
    grid-template-columns: 216px minmax(0, 1fr);
    align-items: start;
  }

  .page-faq .faq-index {
    display: block;
    position: sticky;
    top: calc(var(--header-h) + 24px);
    counter-reset: faqidx;
  }

  .page-faq .faq-index .section-nav-list {
    margin: 0;
    padding: 0;
    list-style: none;
    border-left: 1px solid var(--faq-hair);
  }

  .page-faq .faq-index .section-nav-list > li {
    margin: 0;
  }

  .page-faq .faq-index .section-nav-link {
    display: flex;
    align-items: baseline;
    gap: 10px;
    padding: 8px 12px;
    font-size: 14px;
    color: var(--muted);
    text-decoration: none;
    border-left: 2px solid transparent;
    margin-left: -1px;
    transition: color 0.26s var(--ease), border-color 0.26s var(--ease),
      background-color 0.26s var(--ease);
  }

  .page-faq .faq-index .section-nav-link::before {
    counter-increment: faqidx;
    content: counter(faqidx, decimal-leading-zero);
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.06em;
    color: rgba(152, 164, 181, 0.7);
    transition: color 0.26s var(--ease);
  }

  .page-faq .faq-index .section-nav-link:hover,
  .page-faq .faq-index .section-nav-link:focus-visible {
    color: var(--white);
    background: rgba(16, 20, 28, 0.7);
  }

  .page-faq .faq-index .section-nav-link:hover::before,
  .page-faq .faq-index .section-nav-link:focus-visible::before {
    color: var(--orange);
  }

  .page-faq .faq-index .section-nav-link[aria-current="true"] {
    color: var(--white);
    border-left-color: var(--orange);
    background: rgba(58, 30, 14, 0.42);
  }

  .page-faq .faq-index .section-nav-link[aria-current="true"]::before {
    color: var(--orange);
  }
}

@media (min-width: 1180px) {
  .page-faq .faq-body {
    grid-template-columns: 240px minmax(0, 1fr);
    column-gap: clamp(40px, 4vw, 68px);
  }
}

@media (max-width: 460px) {
  .page-faq .qa-a {
    padding: 2px 15px 16px 15px;
  }

  .page-faq .qa-q {
    padding: 14px 15px;
    font-size: 15.5px;
    gap: 11px;
  }

  .page-faq .hero-stats {
    padding: 18px 18px 18px 20px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa-item[open] .qa-a {
    animation: none;
  }

  .page-faq .faq-tab,
  .page-faq .qa-item,
  .page-faq .qa-toggle,
  .page-faq .qa-toggle::before,
  .page-faq .qa-toggle::after,
  .page-faq .qa-text,
  .page-faq .inline-link {
    transition: none;
  }
}