.page-faq {
  position: relative;
  background:
    radial-gradient(120% 70% at 88% -6%, rgba(41, 240, 176, 0.08), transparent 62%),
    var(--ink);
  color: var(--paper);
  padding-bottom: var(--step);
}

.page-faq .breadcrumbs {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 1.25rem 0 0.25rem;
  font-family: var(--font-data);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.page-faq .breadcrumbs a {
  color: var(--mist);
  text-decoration: none;
  transition: color 0.25s var(--ease);
}

.page-faq .breadcrumbs a:hover {
  color: var(--signal);
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(1.5rem, 5vw, 3.25rem) 0 clamp(2rem, 5vw, 3.25rem);
  border-bottom: 1px solid var(--line-soft);
  background:
    radial-gradient(80% 130% at 84% -14%, rgba(41, 240, 176, 0.14), transparent 62%),
    radial-gradient(70% 110% at 2% 10%, rgba(18, 54, 46, 0.72), transparent 72%);
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(
    180deg,
    rgba(233, 238, 243, 0.03) 0 1px,
    transparent 1px 6px
  );
  pointer-events: none;
  z-index: 0;
}

.page-faq .faq-hero__inner {
  position: relative;
  z-index: 1;
}

.page-faq .faq-hero__kicker {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  margin: 0 0 1rem;
  font-family: var(--font-data);
  font-size: 0.72rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--flare);
}

.page-faq .faq-hero__kicker::before {
  content: "";
  width: 34px;
  height: 1px;
  background: var(--flare);
  flex: none;
}

.page-faq .faq-hero__title {
  margin: 0 0 1.1rem;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(2.1rem, 7.4vw, 4.4rem);
  line-height: 1.04;
  letter-spacing: 0.005em;
  color: var(--paper);
  max-width: 20ch;
}

.page-faq .faq-hero__lede {
  margin: 0 0 1.9rem;
  max-width: 58ch;
  font-size: clamp(0.96rem, 1.4vw, 1.06rem);
  line-height: 1.85;
  color: var(--mist);
}

.page-faq .faq-hero__meta {
  list-style: none;
  margin: 0;
  padding: 1.25rem 0 0;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.7rem 1.8rem;
  border-top: 1px solid var(--line-soft);
}

.page-faq .faq-hero__meta li {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
}

.page-faq .faq-hero__num {
  font-family: var(--font-data);
  font-size: 1.22rem;
  letter-spacing: 0.02em;
  color: var(--neon);
}

.page-faq .faq-hero__lab {
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  color: var(--mist);
}

/* ---------- 双栏骨架 ---------- */

.page-faq .faq-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2rem;
  padding-top: clamp(2rem, 5vw, 3.5rem);
}

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

/* ---------- 左侧分类索引 ---------- */

.page-faq .faq-side__label {
  margin: 0 0 0.9rem;
  font-family: var(--font-data);
  font-size: 0.7rem;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-faq .faq-nav {
  display: flex;
  gap: 0.5rem;
  overflow-x: auto;
  padding-bottom: 0.35rem;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

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

.page-faq .faq-nav__link {
  flex: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.85rem;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: rgba(26, 40, 53, 0.6);
  color: var(--paper);
  text-decoration: none;
  font-size: 0.85rem;
  white-space: nowrap;
  transition: border-color 0.25s var(--ease), background 0.25s var(--ease), color 0.25s var(--ease);
}

.page-faq .faq-nav__num {
  font-family: var(--font-data);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--flare);
}

.page-faq .faq-nav__link:hover {
  border-color: rgba(41, 240, 176, 0.5);
  background: rgba(41, 240, 176, 0.08);
  color: var(--paper);
}

.page-faq .faq-side__foot {
  display: none;
  margin: 1.5rem 0 0;
  padding-top: 1rem;
  border-top: 1px solid var(--line-soft);
  font-size: 0.78rem;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 分类标题 ---------- */

.page-faq .faq-group {
  scroll-margin-top: 4.5rem;
  margin-bottom: clamp(2.5rem, 6vw, 4rem);
}

.page-faq .faq-group:last-of-type {
  margin-bottom: 0;
}

.page-faq .faq-group__head {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.4rem 0.9rem;
  padding-bottom: 0.9rem;
  margin-bottom: 1.1rem;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-group__head::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 58px;
  height: 2px;
  background: linear-gradient(90deg, var(--neon), transparent);
}

.page-faq .faq-group__num {
  flex: none;
  font-family: var(--font-data);
  font-size: 0.8rem;
  letter-spacing: 0.14em;
  color: var(--neon);
}

.page-faq .faq-group__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(1.5rem, 3.6vw, 2.2rem);
  line-height: 1.16;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-faq .faq-group__lede {
  margin: 0 0 1.4rem;
  max-width: 60ch;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 问题折叠面板 ---------- */

.page-faq .faq-item {
  border: 1px solid var(--line);
  border-radius: 2px;
  background: linear-gradient(180deg, rgba(26, 40, 53, 0.78), rgba(16, 19, 24, 0.9));
  box-shadow: 5px 5px 0 rgba(44, 74, 99, 0.16);
  margin-bottom: 0.85rem;
  transition: border-color 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.page-faq .faq-item[open] {
  border-color: rgba(41, 240, 176, 0.42);
  box-shadow: 5px 5px 0 rgba(41, 240, 176, 0.13);
}

.page-faq .faq-item__q {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding: 1rem 1.1rem;
  cursor: pointer;
  list-style: none;
  font-size: 0.98rem;
  line-height: 1.6;
  color: var(--paper);
  transition: color 0.25s var(--ease);
}

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

.page-faq .faq-item__q::marker {
  content: "";
}

.page-faq .faq-item__q:hover {
  color: var(--signal);
}

.page-faq .faq-item__idx {
  flex: none;
  font-family: var(--font-data);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--neon);
}

.page-faq .faq-item__text {
  flex: 1 1 auto;
  min-width: 0;
}

.page-faq .faq-item__mark {
  position: relative;
  flex: none;
  width: 22px;
  height: 22px;
  border: 1px solid var(--line);
  border-radius: 50%;
  transition: border-color 0.25s var(--ease);
}

.page-faq .faq-item__q:hover .faq-item__mark {
  border-color: rgba(41, 240, 176, 0.55);
}

.page-faq .faq-item__mark::before,
.page-faq .faq-item__mark::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  background: var(--neon);
  transform: translate(-50%, -50%);
  transition: transform 0.28s var(--ease), opacity 0.28s var(--ease);
}

.page-faq .faq-item__mark::before {
  width: 9px;
  height: 1.5px;
}

.page-faq .faq-item__mark::after {
  width: 1.5px;
  height: 9px;
}

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

.page-faq .faq-item__a {
  padding: 0.95rem 1.1rem 1.2rem;
  border-top: 1px dashed var(--line-soft);
  font-size: 0.94rem;
  line-height: 1.85;
  color: var(--mist);
}

.page-faq .faq-item__a > *:first-child {
  margin-top: 0;
}

.page-faq .faq-item__a > *:last-child {
  margin-bottom: 0;
}

.page-faq .faq-item__a p {
  margin: 0 0 0.8rem;
  max-width: 62ch;
}

.page-faq .faq-item__a a {
  color: var(--signal);
  text-decoration: underline;
  text-decoration-color: rgba(124, 255, 226, 0.38);
  text-underline-offset: 3px;
  transition: color 0.25s var(--ease), text-decoration-color 0.25s var(--ease);
}

.page-faq .faq-item__a a:hover {
  color: var(--neon);
  text-decoration-color: var(--neon);
}

.page-faq .tick {
  font-family: var(--font-data);
  font-size: 0.86em;
  letter-spacing: 0.02em;
  color: var(--neon);
}

/* ---------- 步骤列表 ---------- */

.page-faq .faq-steps {
  list-style: none;
  counter-reset: faqstep;
  margin: 0 0 0.9rem;
  padding: 0;
}

.page-faq .faq-steps li {
  position: relative;
  padding-left: 2.1rem;
  margin-bottom: 0.55rem;
  line-height: 1.8;
}

.page-faq .faq-steps li:last-child {
  margin-bottom: 0;
}

.page-faq .faq-steps li::before {
  counter-increment: faqstep;
  content: counter(faqstep, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0.12em;
  font-family: var(--font-data);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--neon);
}

/* ---------- 示意图 ---------- */

.page-faq .faq-figure {
  margin: 0 0 1.6rem;
}

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

/* ---------- 底部联系条 ---------- */

.page-faq .faq-cta {
  position: relative;
  overflow: hidden;
  margin-top: clamp(2.5rem, 6vw, 4rem);
  padding: clamp(1.5rem, 4vw, 2.4rem);
  border: 1px solid var(--line);
  border-left: 3px solid var(--amber);
  border-radius: 2px;
  background: linear-gradient(135deg, rgba(18, 54, 46, 0.9), rgba(16, 19, 24, 0.95) 64%);
}

.page-faq .faq-cta::before {
  content: "";
  position: absolute;
  top: -60%;
  right: -10%;
  width: 320px;
  height: 320px;
  background: radial-gradient(circle, rgba(41, 240, 176, 0.16), transparent 68%);
  pointer-events: none;
}

.page-faq .faq-cta__kicker {
  position: relative;
  margin: 0 0 0.6rem;
  font-family: var(--font-data);
  font-size: 0.7rem;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--amber);
}

.page-faq .faq-cta__title {
  position: relative;
  margin: 0 0 0.7rem;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(1.35rem, 3vw, 1.9rem);
  line-height: 1.22;
  color: var(--paper);
}

.page-faq .faq-cta__text {
  position: relative;
  margin: 0 0 1.3rem;
  max-width: 58ch;
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--mist);
}

.page-faq .faq-cta__actions {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

/* ---------- 桌面端 ---------- */

@media (min-width: 900px) {
  .page-faq .faq-shell {
    grid-template-columns: 208px minmax(0, 1fr);
    gap: clamp(2.5rem, 5vw, 4.5rem);
  }

  .page-faq .faq-side {
    position: sticky;
    top: 2rem;
    align-self: start;
  }

  .page-faq .faq-nav {
    display: block;
    overflow: visible;
    padding-bottom: 0;
    border-left: 1px solid var(--line);
  }

  .page-faq .faq-nav__link {
    width: 100%;
    margin-left: -1px;
    padding: 0.55rem 0 0.55rem 0.9rem;
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    background: none;
    color: var(--mist);
    white-space: normal;
  }

  .page-faq .faq-nav__link:hover {
    border-left-color: var(--flare);
    background: linear-gradient(90deg, rgba(255, 90, 60, 0.12), transparent 72%);
    color: var(--paper);
  }

  .page-faq .faq-side__foot {
    display: block;
  }

  .page-faq .faq-item__q {
    padding: 1.1rem 1.35rem;
  }

  .page-faq .faq-item__a {
    padding: 1rem 1.35rem 1.35rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item,
  .page-faq .faq-item__q,
  .page-faq .faq-item__mark,
  .page-faq .faq-nav__link {
    transition: none;
  }
}