.page-faq {
  --faq-rail-w: 232px;
  --faq-cool: var(--cyan);
  --faq-cool-soft: rgba(34, 211, 238, .34);
  --faq-warm: var(--orange);
  --faq-warm-soft: rgba(255, 138, 61, .34);
  color: var(--paper);
}

/* ---------- 面包屑 ---------- */
.page-faq .page-faq-crumbs {
  padding-top: clamp(16px, 3vw, 28px);
}

.page-faq .crumbs {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  letter-spacing: .05em;
  color: var(--fog);
}

.page-faq .crumbs a {
  color: var(--fog);
  text-decoration: none;
  transition: color 200ms var(--ease);
}

.page-faq .crumbs a:hover,
.page-faq .crumbs a:focus-visible {
  color: var(--cyan-mist);
}

.page-faq .crumbs span[aria-hidden="true"] {
  color: rgba(148, 167, 184, .45);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  padding-block: clamp(24px, 4vw, 44px) clamp(32px, 6vw, 64px);
}

.page-faq .faq-hero-grid {
  display: grid;
  gap: clamp(26px, 5vw, 52px);
  align-items: center;
}

.page-faq .faq-hero h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(38px, 8vw, 66px);
  line-height: 1.06;
  letter-spacing: -.02em;
  margin: .22em 0 .3em;
}

.page-faq .faq-hero .lede {
  color: var(--fog);
  font-size: clamp(15px, 2vw, 17px);
  line-height: 1.78;
  max-width: 58ch;
  margin: 0;
}

.page-faq .faq-hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 26px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
  font-size: 14px;
  color: var(--fog);
}

.page-faq .faq-hero-stats li {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
}

.page-faq .faq-hero-stats .num {
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: .04em;
  color: var(--cyan-mist);
  padding: 2px 9px;
  border-radius: var(--radius-pill);
  background: rgba(34, 211, 238, .1);
}

.page-faq .faq-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 26px;
}

.page-faq .faq-hero-media {
  margin: 0;
  border-radius: var(--radius-l);
  overflow: hidden;
  aspect-ratio: 10 / 7;
  border: 1px solid rgba(148, 167, 184, .16);
  background: linear-gradient(150deg, rgba(27, 58, 85, .85), rgba(11, 27, 43, .9));
}

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

/* ---------- 主体双栏 ---------- */
.page-faq .faq-layout {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  align-items: start;
  padding-bottom: clamp(48px, 8vw, 96px);
}

.page-faq .faq-rail-title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--fog);
}

.page-faq .anchor-rail.faq-rail-nav {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 0 0 8px;
  border: 0;
  background: none;
  position: static;
  scrollbar-width: none;
}

.page-faq .anchor-rail.faq-rail-nav::-webkit-scrollbar {
  display: none;
}

.page-faq .faq-rail-nav a {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  flex: 0 0 auto;
  padding: 9px 16px;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(148, 167, 184, .18);
  font-size: 14px;
  color: var(--fog);
  text-decoration: none;
  white-space: nowrap;
  transition: color 200ms var(--ease), background 200ms var(--ease), border-color 200ms var(--ease);
}

.page-faq .faq-rail-nav a .num {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .06em;
  opacity: .75;
}

.page-faq .faq-rail-nav a:hover,
.page-faq .faq-rail-nav a:focus-visible {
  color: var(--paper);
  background: rgba(148, 167, 184, .1);
}

.page-faq .faq-rail-nav a.is-active,
.page-faq .faq-rail-nav a[aria-current="true"] {
  color: var(--paper);
  border-color: rgba(182, 255, 60, .42);
  background: rgba(34, 211, 238, .12);
}

.page-faq .faq-rail-nav a.is-active .num,
.page-faq .faq-rail-nav a[aria-current="true"] .num {
  color: var(--lime);
  opacity: 1;
}

.page-faq .faq-rail-nav a.is-active::after,
.page-faq .faq-rail-nav a[aria-current="true"]::after {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--lime);
  box-shadow: 0 0 10px rgba(182, 255, 60, .7);
}

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

.page-faq .faq-group {
  padding-block: clamp(30px, 4vw, 50px);
  border-top: 1px solid rgba(148, 167, 184, .14);
  scroll-margin-top: 118px;
}

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

.page-faq .faq-group--cool {
  --faq-accent: var(--faq-cool);
  --faq-accent-soft: var(--faq-cool-soft);
}

.page-faq .faq-group--warm {
  --faq-accent: var(--faq-warm);
  --faq-accent-soft: var(--faq-warm-soft);
}

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

.page-faq .faq-group-title {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(21px, 3.2vw, 30px);
  line-height: 1.3;
  letter-spacing: .01em;
  color: var(--paper);
}

.page-faq .faq-group-note {
  margin: 0;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--fog);
}

.page-faq .faq-figure {
  margin: 20px 0 0;
  max-width: 440px;
  border-radius: var(--radius-m);
  overflow: hidden;
  aspect-ratio: 4 / 3;
  border: 1px solid rgba(255, 138, 61, .22);
  background: linear-gradient(140deg, rgba(27, 58, 85, .8), rgba(11, 27, 43, .9));
}

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

/* ---------- 问答条目 ---------- */
.page-faq .faq-list {
  display: grid;
  gap: 10px;
  margin-top: 22px;
}

.page-faq .faq-item {
  border-radius: 22px;
  overflow: hidden;
  background: rgba(18, 41, 63, .58);
  border: 1px solid rgba(148, 167, 184, .14);
  transition: background 240ms var(--ease), border-color 240ms var(--ease);
}

.page-faq .faq-item:hover {
  border-color: rgba(148, 167, 184, .3);
}

.page-faq .faq-item[open] {
  background: rgba(18, 41, 63, .92);
  border-color: var(--faq-accent-soft);
}

.page-faq .faq-item > .collapsible-summary {
  position: relative;
  display: block;
  list-style: none;
  cursor: pointer;
  padding: 17px 54px 17px 36px;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.55;
  color: var(--paper);
}

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

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

.page-faq .faq-item > .collapsible-summary::before {
  content: "";
  position: absolute;
  left: 16px;
  top: 50%;
  width: 2px;
  height: 22px;
  border-radius: 2px;
  background: var(--faq-accent);
  transform: translateY(-50%);
  transition: width 240ms var(--ease), height 240ms var(--ease), box-shadow 240ms var(--ease);
}

.page-faq .faq-item[open] > .collapsible-summary::before {
  width: 4px;
  height: 28px;
  box-shadow: 0 0 12px var(--faq-accent);
}

.page-faq .faq-item > .collapsible-summary::after {
  content: "+";
  position: absolute;
  right: 22px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 19px;
  line-height: 1;
  color: var(--fog);
  transition: color 240ms var(--ease);
}

.page-faq .faq-item[open] > .collapsible-summary::after {
  content: "\2212";
  color: var(--lime);
}

.page-faq .faq-item > .collapsible-summary:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: -2px;
  border-radius: 22px;
}

.page-faq .faq-item > .collapsible-body {
  padding: 0 26px 20px 36px;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--fog);
}

.page-faq .faq-item > .collapsible-body p {
  margin: 0;
  max-width: 66ch;
}

.page-faq .faq-item[open] > .collapsible-body {
  animation: faq-answer-in 240ms var(--ease) both;
}

@keyframes faq-answer-in {
  from {
    opacity: 0;
    transform: translateY(-6px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.page-faq .faq-code {
  font-family: var(--font-mono);
  font-size: .9em;
  letter-spacing: .04em;
  padding: .12em .5em;
  border-radius: 7px;
  background: rgba(34, 211, 238, .14);
  color: var(--cyan-mist);
  border-bottom: 2px solid rgba(34, 211, 238, .5);
  white-space: nowrap;
}

.page-faq .faq-code--warm {
  background: rgba(255, 138, 61, .14);
  color: var(--amber);
  border-bottom-color: rgba(255, 138, 61, .5);
}

.page-faq .faq-answer-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
}

/* ---------- 底部提示 ---------- */
.page-faq .faq-cta {
  margin-top: clamp(28px, 4vw, 48px);
  padding: clamp(26px, 4vw, 40px);
  border-radius: var(--radius-l);
  border: 1px solid rgba(182, 255, 60, .24);
  background:
    radial-gradient(120% 140% at 0% 0%, rgba(34, 211, 238, .16) 0%, rgba(34, 211, 238, 0) 58%),
    radial-gradient(120% 140% at 100% 100%, rgba(255, 138, 61, .14) 0%, rgba(255, 138, 61, 0) 60%),
    rgba(18, 41, 63, .78);
}

.page-faq .faq-cta-title {
  margin: .3em 0 .4em;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(20px, 2.8vw, 26px);
  line-height: 1.36;
  letter-spacing: .01em;
  color: var(--paper);
}

.page-faq .faq-cta-text {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--fog);
}

.page-faq .faq-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

/* ---------- 平板及以上 ---------- */
@media (min-width: 860px) {
  .page-faq .faq-hero-grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr);
  }

  .page-faq .faq-cta {
    padding-inline: clamp(32px, 4vw, 52px);
  }
}

/* ---------- 桌面：常驻锚点列 ---------- */
@media (min-width: 1000px) {
  .page-faq .faq-layout {
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
    gap: clamp(32px, 5vw, 72px);
  }

  .page-faq .faq-rail {
    position: sticky;
    top: 112px;
  }

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

  .page-faq .faq-rail-nav a {
    display: flex;
    width: 100%;
    margin-bottom: 4px;
    padding: 10px 16px;
    border-color: transparent;
    white-space: normal;
  }

  .page-faq .faq-rail-nav a::after {
    margin-left: auto;
  }
}

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

  .page-faq .faq-item,
  .page-faq .faq-item > .collapsible-summary::before,
  .page-faq .faq-item > .collapsible-summary::after,
  .page-faq .faq-rail-nav a {
    transition: none;
  }
}