.page-faq {
  --faq-hair: rgba(42, 53, 102, 0.72);
  --faq-hair-soft: rgba(42, 53, 102, 0.42);
  --faq-panel: rgba(11, 16, 36, 0.72);
  --faq-sticky-top: 110px;
  color: var(--stardust);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(2.25rem, 6vw, 4.5rem) 0 clamp(2rem, 5vw, 3.5rem);
  background:
    radial-gradient(110% 85% at 10% 4%, rgba(111, 75, 216, 0.32), transparent 62%),
    radial-gradient(70% 60% at 92% 88%, rgba(53, 224, 214, 0.16), transparent 64%),
    linear-gradient(180deg, var(--void) 0%, var(--abyss) 100%);
  border-block-end: var(--faq-hair-soft);
}

.page-faq .faq-hero__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.75rem, 5vw, 3rem);
  align-items: center;
}

.page-faq .faq-hero .breadcrumbs {
  margin-bottom: 1.1rem;
}

.page-faq .faq-hero .eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  margin: 0 0 0.9rem;
}

.page-faq .faq-hero .eyebrow::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--pulse);
  box-shadow: var(--glow-pulse);
  animation: faq-pulse 3.4s ease-in-out infinite;
}

.page-faq .faq-hero__title {
  margin: 0 0 1rem;
  font-size: clamp(1.9rem, 7vw, 3.4rem);
  line-height: 1.14;
  letter-spacing: 0.02em;
  color: var(--stardust);
  text-shadow: 0 0 32px rgba(111, 75, 216, 0.45), 0 0 60px rgba(53, 224, 214, 0.12);
}

.page-faq .faq-hero__lede {
  margin: 0 0 1.6rem;
  max-width: 38ch;
  color: var(--grey);
  font-size: clamp(0.95rem, 2.4vw, 1.03rem);
  line-height: 1.85;
}

.page-faq .faq-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
}

.page-faq .faq-hero__figure {
  position: relative;
  margin: 0;
  border-radius: var(--radius-l);
  overflow: hidden;
  border: var(--faq-hair);
  background: linear-gradient(150deg, rgba(20, 27, 58, 0.92), rgba(5, 7, 15, 0.96));
  box-shadow: 0 26px 60px rgba(5, 7, 15, 0.7), var(--glow-purple);
}

.page-faq .faq-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  opacity: 0.95;
}

.page-faq .faq-hero__orbit {
  position: absolute;
  inset: -18% -12% auto auto;
  width: 62%;
  aspect-ratio: 1;
  border-radius: 50%;
  border: 1px dashed rgba(53, 224, 214, 0.34);
  pointer-events: none;
  animation: faq-orbit 74s linear infinite;
}

/* ---------- 主体骨架 ---------- */
.page-faq .faq-body {
  padding: clamp(1.75rem, 5vw, 4rem) 0 clamp(3rem, 7vw, 5.5rem);
  background: linear-gradient(180deg, var(--abyss) 0%, var(--void) 70%);
}

.page-faq .faq-body__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 3.25rem);
  align-items: start;
}

/* ---------- 主题索引 ---------- */
.page-faq .faq-rail {
  position: sticky;
  top: 0;
  z-index: 6;
  margin-inline: calc(var(--gutter) * -1);
  padding: 0.55rem var(--gutter);
  background: rgba(5, 7, 15, 0.94);
  border-block-end: var(--faq-hair-soft);
  backdrop-filter: blur(12px);
}

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

.page-faq .faq-rail__list {
  display: flex;
  gap: 0.45rem;
  margin: 0;
  padding: 0;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

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

.page-faq .faq-rail__link {
  display: block;
  padding: 0.45rem 0.8rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  white-space: nowrap;
  color: var(--grey);
  text-decoration: none;
  border: 1px solid var(--faq-hair-soft);
  border-radius: 999px;
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease), background 0.25s var(--ease);
}

.page-faq .faq-rail__link:hover,
.page-faq .faq-rail__link:focus-visible {
  color: var(--stardust);
  border-color: rgba(111, 75, 216, 0.7);
}

.page-faq .faq-rail__link.is-active {
  color: var(--void);
  background: var(--pulse);
  border-color: var(--pulse);
}

/* ---------- 问答流 ---------- */
.page-faq .faq-stream {
  display: grid;
  gap: clamp(2.25rem, 5vw, 3.5rem);
  min-width: 0;
}

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

.page-faq .faq-block__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.35rem 0.8rem;
  padding-block-end: 0.9rem;
  margin-block-end: 0.6rem;
  border-block-end: var(--faq-hair);
}

.page-faq .faq-block__idx {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.14em;
  color: var(--pulse);
  padding-top: 0.45rem;
}

.page-faq .faq-block__title {
  margin: 0;
  font-size: clamp(1.2rem, 4.4vw, 1.65rem);
  line-height: 1.35;
  letter-spacing: 0.02em;
  color: var(--stardust);
}

.page-faq .faq-block__lede {
  grid-column: 1 / -1;
  margin: 0;
  color: var(--grey);
  font-size: 0.92rem;
  line-height: 1.8;
}

/* ---------- 折叠问答 ---------- */
.page-faq .faq-item {
  border-block-end: var(--faq-hair-soft);
}

.page-faq .faq-item__q {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 0.85rem;
  padding: 1.05rem 0.15rem;
  cursor: pointer;
  list-style: none;
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.6;
  color: var(--stardust);
  transition: color 0.25s var(--ease);
}

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

.page-faq .faq-item__q::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 1.05rem;
  line-height: 1;
  color: var(--purple);
  transition: color 0.25s var(--ease);
}

.page-faq .faq-item[open] .faq-item__q::after {
  content: "–";
  color: var(--pulse);
}

.page-faq .faq-item__q:hover {
  color: #ffffff;
}

.page-faq .faq-item__q:focus-visible {
  outline: 2px solid var(--pulse);
  outline-offset: 2px;
  border-radius: var(--radius-s);
}

.page-faq .faq-item__dot {
  width: 7px;
  height: 7px;
  flex: none;
  border-radius: 50%;
  background: var(--purple);
  box-shadow: 0 0 10px rgba(111, 75, 216, 0.85);
  transition: background 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

.page-faq .faq-item[open] .faq-item__dot {
  background: var(--pulse);
  box-shadow: 0 0 12px rgba(53, 224, 214, 0.9);
}

.page-faq .faq-item__a {
  padding: 0 0.15rem 1.2rem 1.85rem;
  color: var(--grey);
  font-size: 0.93rem;
  line-height: 1.88;
}

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

.page-faq .faq-item__a p:last-child {
  margin-block-end: 0;
}

.page-faq .faq-steps {
  list-style: none;
  margin: 0 0 0.75rem;
  padding: 0;
  display: grid;
  gap: 0.55rem;
  counter-reset: faq-step;
}

.page-faq .faq-steps li {
  position: relative;
  padding-inline-start: 2.1rem;
  counter-increment: faq-step;
}

.page-faq .faq-steps li::before {
  content: "0" counter(faq-step);
  position: absolute;
  inset-inline-start: 0;
  top: 0.15em;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--pulse);
}

/* ---------- 反馈卡片 ---------- */
.page-faq .faq-signal {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.35rem;
  padding: clamp(1.25rem, 4vw, 2.1rem);
  border: 1px solid rgba(255, 194, 75, 0.5);
  border-radius: var(--radius-l);
  background:
    radial-gradient(90% 120% at 100% 0%, rgba(255, 194, 75, 0.14), transparent 62%),
    linear-gradient(160deg, rgba(20, 27, 58, 0.9), rgba(5, 7, 15, 0.94));
  box-shadow: var(--glow-amber), 0 22px 50px rgba(5, 7, 15, 0.6);
  overflow: hidden;
}

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

.page-faq .faq-signal__lead {
  margin: 0 0 1rem;
  color: var(--stardust);
  font-size: 1rem;
  line-height: 1.8;
}

.page-faq .faq-signal__list {
  list-style: none;
  margin: 0 0 1rem;
  padding: 0;
  display: grid;
  gap: 0.65rem;
}

.page-faq .faq-signal__list li {
  color: var(--grey);
  font-size: 0.92rem;
  line-height: 1.8;
  padding-inline-start: 1rem;
  border-inline-start: 2px solid rgba(255, 194, 75, 0.45);
}

.page-faq .faq-signal__key {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  color: var(--amber);
  margin-block-end: 0.15rem;
}

.page-faq .faq-signal__alt {
  margin: 0;
  color: var(--grey);
  font-size: 0.9rem;
  line-height: 1.8;
}

.page-faq .faq-signal__figure {
  margin: 0;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid rgba(255, 194, 75, 0.28);
  background: rgba(5, 7, 15, 0.8);
}

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

/* ---------- 人工协助 ---------- */
.page-faq .faq-assist {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1rem;
}

.page-faq .faq-assist__card {
  padding: 1.2rem 1.3rem;
  border: var(--faq-hair);
  border-radius: var(--radius);
  background: linear-gradient(150deg, rgba(20, 27, 58, 0.78), rgba(11, 16, 36, 0.86));
}

.page-faq .faq-assist__label {
  margin: 0 0 0.35rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--grey);
}

.page-faq .faq-assist__value {
  margin: 0 0 0.8rem;
  font-size: clamp(0.98rem, 3.2vw, 1.16rem);
  color: var(--pulse);
  word-break: break-all;
}

.page-faq .faq-assist__note {
  margin: 0.75rem 0 0;
  color: var(--grey);
  font-size: 0.88rem;
  line-height: 1.8;
}

.page-faq .faq-assist__foot {
  margin: 1.35rem 0 0;
  color: var(--grey);
  font-size: 0.9rem;
  line-height: 1.9;
}

.page-faq .faq-assist__foot a {
  color: var(--purple);
  text-decoration: none;
  border-block-end: 1px solid rgba(111, 75, 216, 0.5);
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease);
}

.page-faq .faq-assist__foot a:hover,
.page-faq .faq-assist__foot a:focus-visible {
  color: var(--pink);
  border-block-end-color: var(--pink);
}

/* ---------- 动画 ---------- */
@keyframes faq-pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.45; transform: scale(0.82); }
}

@keyframes faq-orbit {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-hero .eyebrow::before,
  .page-faq .faq-hero__orbit {
    animation: none;
  }
}

/* ---------- 平板 ---------- */
@media (min-width: 720px) {
  .page-faq .faq-assist {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-faq .faq-assist__foot {
    grid-column: 1 / -1;
  }

  .page-faq .faq-signal__list {
    gap: 0.8rem;
  }
}

@media (min-width: 860px) {
  .page-faq .faq-hero__inner {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
  }

  .page-faq .faq-signal {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: center;
  }
}

/* ---------- 桌面：左侧立式锚点 + 右侧问答 ---------- */
@media (min-width: 1024px) {
  .page-faq .faq-body__inner {
    grid-template-columns: 216px minmax(0, 1fr);
    gap: clamp(2.25rem, 4vw, 3.75rem);
  }

  .page-faq .faq-rail {
    position: sticky;
    top: var(--faq-sticky-top);
    margin: 0;
    padding: 0;
    background: none;
    border: 0;
    backdrop-filter: none;
  }

  .page-faq .faq-rail__title {
    display: block;
    margin: 0 0 0.85rem 0.7rem;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.18em;
    color: var(--grey);
  }

  .page-faq .faq-rail__list {
    flex-direction: column;
    gap: 0.1rem;
    overflow: visible;
  }

  .page-faq .faq-rail__link {
    padding: 0.55rem 0.7rem;
    font-size: 0.76rem;
    white-space: normal;
    border: 0;
    border-inline-start: 2px solid var(--faq-hair-soft);
    border-radius: 0 var(--radius-s) var(--radius-s) 0;
    background: none;
  }

  .page-faq .faq-rail__link:hover,
  .page-faq .faq-rail__link:focus-visible {
    color: var(--stardust);
    border-inline-start-color: var(--purple);
    background: rgba(20, 27, 58, 0.6);
  }

  .page-faq .faq-rail__link.is-active {
    color: var(--stardust);
    background: rgba(111, 75, 216, 0.16);
    border-inline-start-color: var(--pulse);
  }
}

@media (min-width: 1200px) {
  .page-faq .faq-hero__title {
    font-size: 3.5rem;
  }
}