.page-faq {
  --faq-rail-w: 252px;
  --faq-shadow: 0 24px 64px -34px rgba(5, 7, 15, 0.9);
  background: var(--ds-night);
  color: var(--ds-ice);
  overflow-x: hidden;
}

/* ============ 首屏 ============ */
.page-faq .faq-hero {
  position: relative;
  padding: clamp(1.6rem, 4vw, 2.8rem) 0 0;
  border-bottom: 1px solid var(--ds-line);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: -40% -25% auto -25%;
  height: 150%;
  pointer-events: none;
  background:
    radial-gradient(48% 42% at 16% 26%, rgba(36, 224, 224, 0.11), transparent 68%),
    radial-gradient(38% 38% at 88% 12%, rgba(255, 90, 31, 0.09), transparent 70%);
}

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

.page-faq .faq-hero__title {
  margin: 0.7rem 0 0;
  max-width: 20ch;
  font-size: clamp(1.9rem, 6vw, 3.4rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.page-faq .faq-hero__lede {
  margin: 1rem 0 0;
  max-width: 48ch;
  color: var(--ds-mist);
}

.page-faq .faq-hero__chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 1.4rem 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-hero__media {
  margin: clamp(1.6rem, 4vw, 2.6rem) 0 0;
  border-radius: 0;
}

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

/* ============ 主栅格 ============ */
.page-faq .faq-main {
  padding-top: clamp(2rem, 5vw, 3.4rem);
  padding-bottom: clamp(3rem, 8vw, 6rem);
}

.page-faq .faq-layout {
  display: grid;
  gap: clamp(1.8rem, 5vw, 2.6rem);
}

/* ============ 左侧主题轨道 ============ */
.page-faq .faq-rail__label {
  margin: 0 0 0.8rem;
  font-family: var(--ds-font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ds-mist);
}

.page-faq .faq-toc {
  display: flex;
  gap: 0.15rem;
  margin: 0;
  padding: 0 0 0.4rem;
  list-style: none;
  overflow-x: auto;
  border-bottom: 1px solid var(--ds-line);
  scrollbar-width: none;
}

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

.page-faq .faq-toc__link {
  display: inline-flex;
  align-items: baseline;
  gap: 0.45rem;
  flex: 0 0 auto;
  padding: 0.55rem 0.85rem;
  border-bottom: 2px solid transparent;
  color: var(--ds-mist);
  text-decoration: none;
  font-size: 0.92rem;
  white-space: nowrap;
  transition: color 160ms var(--ds-ease), border-color 160ms var(--ds-ease);
}

.page-faq .faq-toc__link:hover,
.page-faq .faq-toc__link:focus-visible {
  color: var(--ds-ice);
  border-bottom-color: var(--ds-cyan);
}

.page-faq .faq-toc__link:focus-visible {
  outline: 2px solid var(--ds-cyan);
  outline-offset: 2px;
}

.page-faq .faq-toc__num {
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  color: var(--ds-cyan);
}

.page-faq .faq-rail__note {
  margin-top: 1.4rem;
  padding: 1rem 1.1rem;
  background: var(--ds-indigo);
  border-left: 2px solid var(--ds-cyan);
}

.page-faq .faq-rail__note-k {
  margin: 0;
  font-family: var(--ds-font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ds-mist);
}

.page-faq .faq-rail__note-v {
  margin: 0.45rem 0 0.2rem;
  font-size: 1.24rem;
  color: var(--ds-ice);
  letter-spacing: 0.02em;
}

.page-faq .faq-rail__note-s {
  margin: 0;
  font-size: 0.84rem;
  line-height: 1.7;
  color: var(--ds-mist);
}

.page-faq .faq-rail__note-s .ds-num {
  color: var(--ds-amber);
}

/* ============ 问答分组 ============ */
.page-faq .faq-group {
  padding-top: clamp(2.4rem, 6vw, 3.4rem);
  scroll-margin-top: 5.5rem;
}

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

.page-faq .faq-group__head {
  display: grid;
  gap: 0.5rem;
  padding-bottom: 0.9rem;
  margin-bottom: 0.2rem;
  border-bottom: 1px solid var(--ds-line-strong);
}

.page-faq .faq-group__num {
  font-family: var(--ds-font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.2em;
  color: var(--ds-cyan);
}

.page-faq .faq-group__title {
  margin: 0;
  font-size: clamp(1.4rem, 3.6vw, 1.9rem);
  line-height: 1.22;
  letter-spacing: -0.01em;
  color: var(--ds-ice);
}

.page-faq .faq-group__lede {
  margin: 0;
  max-width: 44ch;
  font-size: 0.96rem;
  line-height: 1.8;
  color: var(--ds-mist);
}

/* ============ 折叠条目 ============ */
.page-faq .faq-list {
  display: block;
}

.page-faq .faq-item {
  position: relative;
  border-bottom: 1px solid var(--ds-line);
}

.page-faq .faq-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 2px;
  height: 0;
  background: linear-gradient(180deg, var(--ds-cyan), var(--ds-cyan-press));
  transition: height 360ms var(--ds-ease);
}

.page-faq .faq-item[open]::before {
  height: 100%;
}

.page-faq .faq-item__q {
  position: relative;
  display: block;
  padding: 1.05rem 2.4rem 1.05rem 0.95rem;
  cursor: pointer;
  font-size: 1.01rem;
  font-weight: 600;
  line-height: 1.62;
  color: var(--ds-ice);
  list-style: none;
  transition: color 160ms var(--ds-ease);
}

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

.page-faq .faq-item__q::before {
  content: "";
  position: absolute;
  right: 0.5rem;
  top: 1.55rem;
  width: 9px;
  height: 9px;
  border-right: 1.5px solid var(--ds-mist);
  border-bottom: 1.5px solid var(--ds-mist);
  transform: rotate(45deg);
  transition: transform 220ms var(--ds-ease), border-color 160ms var(--ds-ease);
}

.page-faq .faq-item[open] > .faq-item__q::before {
  transform: rotate(-135deg);
  border-color: var(--ds-cyan);
}

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

.page-faq .faq-item__q:focus-visible {
  outline: 2px solid var(--ds-cyan);
  outline-offset: 2px;
}

.page-faq .faq-item__a {
  padding: 0 0.95rem 1.35rem;
  max-width: 64ch;
  font-size: 0.97rem;
  line-height: 1.85;
  color: var(--ds-mist);
  animation: faq-drop 260ms var(--ds-ease) both;
}

.page-faq .faq-item__a > p {
  margin: 0 0 0.7rem;
}

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

.page-faq .faq-item__a .ds-num {
  color: var(--ds-ice);
  font-size: 1.04em;
}

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

/* 有序步骤 */
.page-faq .faq-steps {
  display: grid;
  gap: 0.55rem;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: faq-step;
}

.page-faq .faq-steps li {
  position: relative;
  padding-left: 2.4rem;
  counter-increment: faq-step;
}

.page-faq .faq-steps li::before {
  content: counter(faq-step, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0.28rem;
  padding: 0.05rem 0.3rem;
  font-family: var(--ds-font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--ds-cyan);
  border: 1px solid rgba(36, 224, 224, 0.36);
  border-radius: 2px;
}

/* 无序列点 */
.page-faq .faq-dots {
  display: grid;
  gap: 0.5rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-dots li {
  position: relative;
  padding-left: 1.15rem;
}

.page-faq .faq-dots li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.75em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--ds-signal);
}

/* ============ 入口位置示意图 ============ */
.page-faq .faq-shot {
  margin: 1.5rem 0 1.9rem;
  border: 1px solid var(--ds-line);
  background: var(--ds-indigo);
  overflow: hidden;
}

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

.page-faq .faq-shot__cap {
  display: block;
  padding: 0.7rem 0.95rem;
  border-top: 1px solid var(--ds-line);
  background: rgba(5, 7, 15, 0.6);
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  color: var(--ds-mist);
}

/* ============ 联系出口 ============ */
.page-faq .faq-reach {
  margin-top: clamp(3rem, 8vw, 5rem);
  padding-top: clamp(2rem, 5vw, 3rem);
  border-top: 1px solid var(--ds-line-strong);
  scroll-margin-top: 5.5rem;
}

.page-faq .faq-reach__card {
  display: grid;
  gap: 1.6rem;
  padding: clamp(1.3rem, 4vw, 2.4rem);
  background: var(--ds-glass);
  border: 1px solid rgba(255, 90, 31, 0.72);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 26px 70px -40px rgba(255, 90, 31, 0.6), var(--faq-shadow);
}

.page-faq .faq-reach__title {
  margin: 0.6rem 0 0;
  font-size: clamp(1.45rem, 4vw, 2rem);
  line-height: 1.22;
  letter-spacing: -0.01em;
  color: var(--ds-ice);
}

.page-faq .faq-reach__text {
  margin: 0.9rem 0 0;
  color: var(--ds-mist);
  font-size: 0.97rem;
}

.page-faq .faq-reach__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: 1.4rem;
}

.page-faq .faq-reach__rows {
  display: grid;
  gap: 0.7rem;
  align-content: start;
}

.page-faq .faq-reach__row {
  display: grid;
  gap: 0.22rem;
  padding: 0.85rem 1rem;
  background: rgba(5, 7, 15, 0.62);
  border-left: 2px solid var(--ds-cyan);
}

.page-faq .faq-reach__row--wide {
  border-left-color: var(--ds-signal);
}

.page-faq .faq-reach__k {
  font-family: var(--ds-font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ds-mist);
}

.page-faq .faq-reach__v {
  font-size: 1rem;
  line-height: 1.6;
  color: var(--ds-ice);
  word-break: break-word;
  overflow-wrap: anywhere;
}

/* ============ 相关入口 ============ */
.page-faq .faq-next {
  display: grid;
  gap: 1px;
  margin-top: clamp(1.8rem, 4vw, 2.6rem);
  background: var(--ds-line);
  border: 1px solid var(--ds-line);
}

.page-faq .faq-next__item {
  display: block;
  padding: 1.25rem 1.15rem;
  background: var(--ds-indigo);
  color: var(--ds-ice);
  text-decoration: none;
  transition: background 160ms var(--ds-ease), color 160ms var(--ds-ease);
}

.page-faq .faq-next__item:hover,
.page-faq .faq-next__item:focus-visible {
  background: var(--ds-indigo-lift);
  color: var(--ds-cyan);
}

.page-faq .faq-next__item:focus-visible {
  outline: 2px solid var(--ds-cyan);
  outline-offset: -2px;
}

.page-faq .faq-next__label {
  display: block;
  margin-bottom: 0.4rem;
  font-family: var(--ds-font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ds-amber);
}

.page-faq .faq-next__title {
  display: block;
  font-size: 1.02rem;
  font-weight: 600;
  line-height: 1.5;
}

.page-faq .faq-next__desc {
  display: block;
  margin-top: 0.35rem;
  font-size: 0.87rem;
  line-height: 1.7;
  color: var(--ds-mist);
}

/* ============ 响应式 ============ */
@media (min-width: 700px) {
  .page-faq .faq-next {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-faq .faq-reach__card {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.02fr);
    gap: 2.4rem;
    align-items: start;
  }
}

@media (min-width: 1000px) {
  .page-faq .faq-layout {
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
    gap: clamp(2.4rem, 5vw, 4rem);
    align-items: start;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: 6rem;
  }

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

  .page-faq .faq-toc__link {
    display: flex;
    width: 100%;
    padding: 0.55rem 0 0.55rem 0.95rem;
    margin-left: -1px;
    border-bottom: 0;
    border-left: 2px solid transparent;
    white-space: normal;
  }

  .page-faq .faq-toc__link:hover,
  .page-faq .faq-toc__link:focus-visible {
    border-left-color: var(--ds-cyan);
    border-bottom-color: transparent;
    background: linear-gradient(90deg, var(--ds-cyan-soft), transparent 78%);
  }

  .page-faq .faq-group:first-child {
    padding-top: 0.2rem;
  }

  .page-faq .faq-group__head {
    grid-template-columns: auto minmax(0, 1fr);
    column-gap: 1rem;
    align-items: baseline;
  }

  .page-faq .faq-group__num {
    grid-row: 1 / 3;
    font-size: 0.86rem;
  }

  .page-faq .faq-group__lede {
    grid-column: 2;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item__a {
    animation: none;
  }

  .page-faq .faq-item::before,
  .page-faq .faq-item__q::before,
  .page-faq .faq-toc__link,
  .page-faq .faq-next__item {
    transition: none;
  }
}