.page-faq {
  --faq-cut: 12px;
  --faq-row-line: rgba(143, 169, 174, .16);
  --faq-ink: #B9CFCD;
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding-top: clamp(28px, 6vw, 64px);
  background:
    radial-gradient(88% 120% at 100% 0%, rgba(59, 44, 110, .5), transparent 62%),
    radial-gradient(70% 90% at 0% 8%, rgba(37, 245, 194, .08), transparent 60%),
    linear-gradient(180deg, var(--cabin) 0%, var(--night) 74%);
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: repeating-linear-gradient(90deg, var(--line-soft) 0 1px, transparent 1px 14px);
  opacity: .55;
}

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

.page-faq .faq-hero__grid {
  display: grid;
  gap: 28px;
  margin-top: clamp(20px, 3vw, 36px);
  padding-bottom: clamp(34px, 5vw, 58px);
}

.page-faq .faq-hero h1 {
  margin: 12px 0 0;
  font-size: clamp(28px, 5.4vw, 52px);
  line-height: 1.1;
  font-weight: 900;
  letter-spacing: -.02em;
  color: var(--mist);
}

.page-faq .faq-hero .lead {
  margin: 18px 0 0;
  max-width: 34em;
  font-size: 17px;
  line-height: 1.85;
  color: var(--faq-ink);
}

.page-faq .faq-facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  border: 1px solid var(--line-soft);
  background: rgba(11, 40, 49, .62);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--faq-cut)), calc(100% - var(--faq-cut)) 100%, 0 100%);
}

.page-faq .faq-facts li {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: baseline;
  gap: 14px;
  padding: 16px 20px;
  border-top: 1px solid var(--faq-row-line);
}

.page-faq .faq-facts li:first-child {
  border-top: 0;
}

.page-faq .faq-facts__num {
  min-width: 54px;
  font-size: 30px;
  line-height: 1;
  color: var(--neon);
}

.page-faq .faq-facts__txt {
  font-size: 14px;
  line-height: 1.6;
  color: var(--slate);
}

@media (min-width: 960px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1.28fr) minmax(0, .82fr);
    align-items: end;
    gap: clamp(32px, 5vw, 72px);
  }
}

/* ---------- 三步路径 ---------- */

.page-faq .faq-path {
  background: var(--night);
}

.page-faq .faq-path .media-frame {
  margin-top: clamp(22px, 4vw, 38px);
}

.page-faq .path-steps {
  list-style: none;
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: 0;
  display: grid;
  counter-reset: faq-step;
}

.page-faq .path-steps li {
  position: relative;
  padding: 24px 0 24px 60px;
  border-top: 1px solid var(--faq-row-line);
}

.page-faq .path-steps li::before {
  counter-increment: faq-step;
  content: counter(faq-step, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 27px;
  padding-left: 8px;
  border-left: 2px solid var(--neon);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--neon);
}

.page-faq .path-steps h3 {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--mist);
}

.page-faq .path-steps p {
  margin: 0;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--slate);
}

.page-faq .faq-path__note {
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding-left: 14px;
  border-left: 3px solid var(--indigo);
  font-size: 15px;
  line-height: 1.8;
  color: var(--faq-ink);
}

@media (min-width: 840px) {
  .page-faq .path-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    column-gap: clamp(20px, 3vw, 36px);
  }

  .page-faq .path-steps li {
    padding: 26px 0 8px;
    border-top: 2px solid var(--line);
  }

  .page-faq .path-steps li::before {
    top: -2px;
    padding: 0;
    border-left: 0;
    transform: translateY(-50%);
    background: var(--night);
    padding-right: 10px;
  }
}

/* ---------- 清单区 ---------- */

.page-faq .faq-index {
  background: linear-gradient(180deg, var(--night) 0%, var(--cabin) 55%, var(--night) 100%);
}

.page-faq .filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: clamp(20px, 3vw, 28px);
}

.page-faq .filter-chip {
  padding: 8px 16px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--slate);
  background: var(--panel);
  border: 1px solid var(--line-soft);
  cursor: pointer;
  transition: color .18s var(--ease), background .18s var(--ease), border-color .18s var(--ease);
  clip-path: polygon(10px 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%, 0 10px);
}

.page-faq .filter-chip:hover {
  color: var(--mist);
  border-color: var(--line);
}

.page-faq .filter-chip:focus-visible {
  outline: 2px solid var(--neon);
  outline-offset: 2px;
}

.page-faq .filter-chip[aria-pressed="true"] {
  color: var(--night);
  background: var(--neon);
  border-color: var(--neon);
  font-weight: 700;
}

.page-faq .faq-empty {
  margin: 22px 0 0;
  font-size: 14px;
  color: var(--slate);
}

.page-faq .faq-groups {
  margin-top: clamp(28px, 4vw, 46px);
  display: grid;
  gap: clamp(32px, 4vw, 50px);
}

.page-faq .faq-group__title {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .16em;
  color: var(--slate);
}

.page-faq .faq-group__title::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--faq-row-line);
}

.page-faq .faq-group__lead {
  margin: 0 0 4px;
  max-width: 38em;
  font-size: 14px;
  line-height: 1.7;
  color: var(--slate);
}

/* ---------- 折叠条目 ---------- */

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

.page-faq .faq-item:last-child {
  border-bottom: 1px solid var(--faq-row-line);
}

.page-faq .faq-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--neon);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform .2s var(--ease);
}

.page-faq .faq-item:hover::before,
.page-faq .faq-item:focus-within::before {
  transform: scaleY(1);
}

.page-faq .faq-item__head {
  margin: 0;
}

.page-faq .faq-item__toggle {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: start;
  gap: 12px;
  width: 100%;
  margin: 0;
  padding: 18px 6px 18px 14px;
  background: none;
  border: 0;
  text-align: left;
  font-family: inherit;
  font-size: inherit;
  color: inherit;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

.page-faq .faq-item__toggle:focus-visible {
  outline: 2px solid var(--neon);
  outline-offset: -2px;
}

.page-faq .faq-item__no {
  align-self: start;
  padding: 3px 9px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.3;
  letter-spacing: .04em;
  white-space: nowrap;
  color: var(--neon);
  background: rgba(37, 245, 194, .1);
  border: 1px solid var(--line);
  clip-path: polygon(6px 0, 100% 0, 100% calc(100% - 6px), calc(100% - 6px) 100%, 0 100%, 0 6px);
}

.page-faq .faq-group--data .faq-item__no {
  color: var(--amber);
  background: rgba(255, 194, 75, .1);
  border-color: rgba(255, 194, 75, .34);
}

.page-faq .faq-group--device .faq-item__no {
  color: #FFB59A;
  background: rgba(124, 33, 64, .5);
  border-color: rgba(255, 107, 44, .36);
}

.page-faq .faq-group--channel .faq-item__no {
  color: var(--mist);
  background: var(--indigo);
  border-color: rgba(233, 245, 243, .2);
}

.page-faq .faq-item__q {
  display: block;
  padding-top: 1px;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.6;
  letter-spacing: -.01em;
  color: var(--mist);
}

.page-faq .faq-item__mark {
  position: relative;
  width: 14px;
  height: 14px;
  margin-top: 7px;
}

.page-faq .faq-item__mark::before,
.page-faq .faq-item__mark::after {
  content: "";
  position: absolute;
  background: var(--neon);
  transition: transform .2s var(--ease);
}

.page-faq .faq-item__mark::before {
  left: 0;
  top: 6px;
  width: 14px;
  height: 2px;
}

.page-faq .faq-item__mark::after {
  left: 6px;
  top: 0;
  width: 2px;
  height: 14px;
}

.page-faq .faq-item__toggle[aria-expanded="true"] .faq-item__mark::after {
  transform: scaleY(0);
}

/* 展开面板内部 */

.page-faq .faq-answer {
  padding: 0 6px 22px 14px;
}

.page-faq .faq-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
  counter-reset: faq-s;
}

.page-faq .faq-steps li {
  position: relative;
  padding-left: 28px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--faq-ink);
}

.page-faq .faq-steps li::before {
  counter-increment: faq-s;
  content: counter(faq-s);
  position: absolute;
  left: 0;
  top: .5em;
  width: 17px;
  height: 17px;
  line-height: 17px;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--neon);
  border: 1px solid var(--line);
}

.page-faq .faq-answer .media-frame {
  margin: 16px 0 0;
  max-width: 400px;
}

.page-faq .faq-ref {
  margin: 16px 0 0;
  padding-top: 12px;
  border-top: 1px dashed var(--faq-row-line);
  font-size: 13px;
  line-height: 1.6;
  color: var(--slate);
}

.page-faq .faq-ref .data {
  color: var(--mist);
}

@media (min-width: 640px) {
  .page-faq .faq-item__q {
    font-size: 17px;
  }

  .page-faq .faq-item__toggle {
    padding-right: 10px;
  }

  .page-faq .faq-answer {
    padding-left: calc(14px + 78px);
    padding-right: 10px;
  }
}

/* ---------- 末尾指引 ---------- */

.page-faq .faq-next {
  background: var(--night);
}

.page-faq .faq-next__panel {
  display: grid;
  gap: 22px;
  padding: clamp(24px, 4vw, 40px);
  background:
    linear-gradient(120deg, rgba(37, 245, 194, .07), transparent 55%),
    var(--cabin);
  border: 1px solid var(--line-soft);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
}

.page-faq .faq-next__panel h2 {
  margin: 10px 0 0;
  font-size: clamp(22px, 3vw, 30px);
  line-height: 1.25;
  font-weight: 900;
  letter-spacing: -.02em;
  color: var(--mist);
}

.page-faq .faq-next__panel p {
  margin: 12px 0 0;
  max-width: 36em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--slate);
}

.page-faq .faq-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

@media (min-width: 860px) {
  .page-faq .faq-next__panel {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, .9fr);
    align-items: center;
    gap: clamp(28px, 4vw, 56px);
  }

  .page-faq .faq-next__links {
    justify-content: flex-end;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item::before,
  .page-faq .faq-item__mark::before,
  .page-faq .faq-item__mark::after,
  .page-faq .filter-chip {
    transition: none;
  }
}