.page-faq {
  --faq-line: rgba(23, 224, 210, 0.18);
  --faq-panel: rgba(20, 48, 79, 0.55);
  background: var(--bg);
  color: var(--text);
  overflow-x: hidden;
}
.page-faq *,
.page-faq *::before,
.page-faq *::after {
  box-sizing: border-box;
}
.page-faq a:focus-visible,
.page-faq summary:focus-visible {
  outline: 2px solid var(--c-cyan);
  outline-offset: 2px;
}

/* ---------- 面包屑 ---------- */
.page-faq .breadcrumbs {
  padding: 18px 0 6px;
  font-size: 13px;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(14px, 3vw, 26px) 0 clamp(30px, 5vw, 58px);
  background:
    radial-gradient(110% 80% at 88% 0%, rgba(23, 224, 210, 0.16), transparent 62%),
    radial-gradient(90% 70% at 2% 100%, rgba(255, 91, 46, 0.10), transparent 60%),
    linear-gradient(180deg, var(--bg-raised), var(--bg));
  border-bottom: 1px solid var(--faq-line);
}
.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(0deg, var(--faq-line) 0 1px, transparent 1px 52px),
    repeating-linear-gradient(90deg, var(--faq-line) 0 1px, transparent 1px 52px);
  opacity: 0.5;
  pointer-events: none;
}
.page-faq .faq-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 3vw, 38px);
  align-items: end;
}
.page-faq .faq-hero h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(30px, 7.2vw, 54px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: #ffffff;
  margin: 12px 0 14px;
}
.page-faq .faq-hero__text {
  max-width: 34em;
  margin: 0;
  font-size: 16px;
  line-height: 1.78;
  color: var(--text-dim);
}
.page-faq .faq-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}
.page-faq .faq-hero__panel {
  border: 1px solid var(--faq-line);
  background: var(--faq-panel);
  border-radius: var(--radius);
  padding: 16px 18px 18px;
}
.page-faq .faq-hero__panel-title {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--c-rock);
}
.page-faq .hero-facts {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}
.page-faq .hero-facts li {
  background: var(--bg-raised);
  padding: 14px 12px;
  display: grid;
  gap: 3px;
}
.page-faq .hero-facts__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 25px;
  font-weight: 700;
  color: var(--c-cyan);
  line-height: 1.1;
}
.page-faq .hero-facts li:nth-child(4) .hero-facts__num {
  color: var(--c-amber);
}
.page-faq .hero-facts__label {
  font-size: 12.5px;
  color: var(--text-dim);
}

/* ---------- 主题卡 ---------- */
.page-faq .topic-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: 24px;
}
.page-faq .topic-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  grid-template-areas:
    "tag count"
    "title count"
    "text count";
  gap: 7px 16px;
  align-items: start;
  padding: 18px;
  border: 1px solid var(--line-soft);
  background: var(--bg-raised);
  border-radius: var(--radius);
  text-decoration: none;
  color: inherit;
  transition: border-color 0.2s ease, transform 0.2s ease, background 0.2s ease;
}
.page-faq .topic-card .tag {
  grid-area: tag;
  justify-self: start;
}
.page-faq .topic-card__title {
  grid-area: title;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: #ffffff;
}
.page-faq .topic-card__text {
  grid-area: text;
  font-size: 13.8px;
  line-height: 1.7;
  color: var(--text-dim);
}
.page-faq .topic-card__count {
  grid-area: count;
  align-self: center;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 28px;
  font-weight: 700;
  color: var(--c-orange);
  line-height: 1;
  text-align: right;
}
.page-faq .topic-card__count i {
  font-style: normal;
  font-size: 12px;
  color: var(--c-rock);
  margin-left: 3px;
}
.page-faq .topic-card:hover,
.page-faq .topic-card:focus-visible {
  border-color: var(--c-cyan);
  background: var(--c-night);
  transform: translateX(2px);
}

/* ---------- 快捷定位 ---------- */
.page-faq .chipbar {
  display: flex;
  gap: 8px;
  margin-top: 20px;
  padding: 2px 0 8px;
  overflow-x: auto;
}
.page-faq .chip {
  flex: 0 0 auto;
  padding: 8px 14px;
  border: 1px solid var(--line-soft);
  border-radius: 999px;
  font-size: 13px;
  color: var(--text-dim);
  text-decoration: none;
  white-space: nowrap;
  transition: border-color 0.2s ease, color 0.2s ease, background 0.2s ease;
}
.page-faq .chip:hover,
.page-faq .chip:focus-visible {
  border-color: var(--c-cyan);
  color: var(--c-cyan);
  background: rgba(23, 224, 210, 0.08);
}

/* ---------- 热门问题 ---------- */
.page-faq .hot-list {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  counter-reset: hot;
}
.page-faq .hot-item {
  background: var(--bg);
  padding: 15px 16px 16px;
  display: grid;
  gap: 6px;
}
.page-faq .hot-item__q {
  margin: 0;
  font-size: 15.5px;
  font-weight: 600;
  line-height: 1.5;
  color: #ffffff;
}
.page-faq .hot-item__q::before {
  counter-increment: hot;
  content: counter(hot, decimal-leading-zero);
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  color: var(--c-cyan);
  margin-right: 9px;
}
.page-faq .hot-item__a {
  margin: 0;
  font-size: 14.2px;
  line-height: 1.72;
  color: var(--text-dim);
}

/* ---------- 换设备步骤 ---------- */
.page-faq .steps-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 3vw, 36px);
  margin-top: 26px;
  align-items: start;
}
.page-faq .steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}
.page-faq .steps > li {
  position: relative;
}
.page-faq .steps > li::before {
  content: "";
  position: absolute;
  left: 22px;
  top: 48px;
  bottom: -12px;
  width: 1px;
  background: linear-gradient(180deg, var(--line-strong), var(--line-soft));
}
.page-faq .steps > li:last-child::before {
  content: none;
}
.page-faq .step {
  border: 1px solid var(--line-soft);
  background: var(--faq-panel);
  border-radius: var(--radius);
  transition: border-color 0.2s ease, background 0.2s ease;
}
.page-faq .step:hover {
  border-color: var(--line-strong);
}
.page-faq .step[open] {
  background: var(--c-night);
}
.page-faq .step__head {
  position: relative;
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 52px;
  padding: 12px 16px 12px 52px;
}
.page-faq .step__head::-webkit-details-marker {
  display: none;
}
.page-faq .step__num {
  position: absolute;
  left: 8px;
  top: 50%;
  transform: translateY(-50%);
  width: 30px;
  height: 30px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  font-weight: 700;
  background: var(--c-rock);
  color: var(--c-deep);
}
.page-faq .step__title {
  flex: 1 1 auto;
  font-size: 15.5px;
  font-weight: 600;
  color: var(--text);
}
.page-faq .step__arrow {
  flex: 0 0 auto;
  width: 8px;
  height: 8px;
  border-right: 1.5px solid var(--c-rock);
  border-bottom: 1.5px solid var(--c-rock);
  transform: rotate(45deg);
  transition: transform 0.2s ease, border-color 0.2s ease;
}
.page-faq .step[open] .step__arrow {
  transform: rotate(-135deg);
  border-color: var(--c-cyan);
}
.page-faq .step--current {
  border-color: var(--line-strong);
}
.page-faq .step--current .step__num {
  background: var(--c-cyan);
  color: var(--c-ink);
}
.page-faq .step--current .step__title {
  color: #ffffff;
}
.page-faq .step__body {
  margin: 0;
  padding: 0 18px 16px 52px;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--text-dim);
  animation: faq-fade 0.25s ease-out;
}

/* ---------- 图片容器 ---------- */
.page-faq .shot {
  margin: 0;
  border: 1px solid var(--line-soft);
  background: var(--bg-raised);
  border-radius: var(--radius);
  overflow: hidden;
}
.page-faq .shot img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}
.page-faq .shot figcaption {
  padding: 11px 14px;
  border-top: 1px solid var(--line-soft);
  font-size: 13px;
  line-height: 1.65;
  color: var(--text-dim);
}

/* ---------- 分组问答 ---------- */
.page-faq .faq-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
  margin-top: 26px;
}
.page-faq .faq-rail {
  border: 1px solid var(--line-soft);
  background: var(--faq-panel);
  border-radius: var(--radius);
  padding: 16px;
}
.page-faq .faq-rail__label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--c-rock);
}
.page-faq .faq-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px;
}
.page-faq .faq-rail__list a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  min-height: 46px;
  padding: 10px 10px;
  border-left: 2px solid transparent;
  color: var(--text-dim);
  font-size: 14px;
  text-decoration: none;
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}
.page-faq .faq-rail__list a:hover,
.page-faq .faq-rail__list a:focus-visible {
  color: var(--c-cyan);
  border-left-color: var(--c-cyan);
  background: rgba(23, 224, 210, 0.07);
}
.page-faq .faq-rail__count {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  color: var(--c-rock);
}

.page-faq .faq-block {
  margin-bottom: 38px;
}
.page-faq .faq-block:last-child {
  margin-bottom: 0;
}
.page-faq .faq-block__title {
  margin: 0 0 10px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line-strong);
  font-family: var(--font-display);
  font-size: clamp(20px, 3.4vw, 26px);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: #ffffff;
}
.page-faq .faq-block__lead {
  margin: 0 0 16px;
  max-width: 40em;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--text-dim);
}
.page-faq .faq-block .shot {
  margin: 0 0 18px;
}

.page-faq .faq-item {
  border-bottom: 1px solid var(--line-soft);
}
.page-faq .faq-item__head {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: flex-start;
  gap: 10px;
  min-height: 50px;
  padding: 15px 2px;
  font-size: 15.5px;
  font-weight: 600;
  line-height: 1.55;
  color: var(--text);
  transition: color 0.2s ease;
}
.page-faq .faq-item__head::-webkit-details-marker {
  display: none;
}
.page-faq .faq-item__mark {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12.5px;
  line-height: 1.75;
  color: var(--c-cyan);
}
.page-faq .faq-item__arrow {
  flex: 0 0 auto;
  width: 8px;
  height: 8px;
  margin: 8px 0 0 auto;
  border-right: 1.5px solid var(--c-rock);
  border-bottom: 1.5px solid var(--c-rock);
  transform: rotate(45deg);
  transition: transform 0.2s ease, border-color 0.2s ease;
}
.page-faq .faq-item[open] .faq-item__arrow {
  transform: rotate(-135deg);
  border-color: var(--c-cyan);
}
.page-faq .faq-item[open] .faq-item__head {
  color: var(--c-cyan-soft);
}
.page-faq .faq-item__body {
  margin: 0;
  padding: 0 2px 18px 26px;
  max-width: 46em;
  font-size: 14.5px;
  line-height: 1.82;
  color: var(--text-dim);
  animation: faq-fade 0.25s ease-out;
}
.page-faq .faq-item__body a {
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(23, 224, 210, 0.4);
}
.page-faq .faq-item__body a:hover {
  border-bottom-color: var(--c-cyan);
}

@keyframes faq-fade {
  from {
    opacity: 0;
    transform: translateY(-3px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* ---------- 反馈 ---------- */
.page-faq .fb-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: 24px;
}
.page-faq .fb-card {
  border: 1px solid var(--line-soft);
  border-top: 2px solid var(--c-cyan);
  background: var(--bg-raised);
  border-radius: var(--radius);
  padding: 17px 16px 18px;
}
.page-faq .fb-card:nth-child(2) {
  border-top-color: var(--c-amber);
}
.page-faq .fb-card:nth-child(3) {
  border-top-color: var(--c-orange);
}
.page-faq .fb-card:nth-child(4) {
  border-top-color: var(--c-moss);
}
.page-faq .fb-card__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  color: #ffffff;
}
.page-faq .fb-card__where {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--c-rock);
}
.page-faq .fb-card__need {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-dim);
}
.page-faq .fb-tips {
  margin-top: 16px;
  padding: 16px 18px;
  border: 1px solid var(--line-soft);
  border-left: 2px solid var(--c-clay);
  background: rgba(20, 48, 79, 0.5);
  border-radius: var(--radius);
}
.page-faq .fb-tips__title {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--c-clay);
}
.page-faq .fb-tips__text {
  margin: 0;
  max-width: 46em;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--text-dim);
}

/* ---------- 联系方式 ---------- */
.page-faq .contact-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
  margin-top: 22px;
}
.page-faq .contact-lead {
  margin: 0 0 18px;
  max-width: 38em;
  font-size: 15px;
  line-height: 1.78;
  color: var(--text-dim);
}
.page-faq .contact-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line-soft);
}
.page-faq .contact-list li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 16px;
  padding: 13px 2px;
  border-bottom: 1px solid var(--line-soft);
}
.page-faq .contact-list__label {
  flex: 0 0 84px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--c-rock);
}
.page-faq .contact-list__value {
  flex: 1 1 auto;
  min-width: 0;
  font-size: 15px;
  line-height: 1.6;
  color: var(--text);
  word-break: break-word;
}
.page-faq .contact-list__value--mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.01em;
}
.page-faq .contact-aside {
  border: 1px solid var(--line-soft);
  background: var(--faq-panel);
  border-radius: var(--radius);
  padding: 18px;
}
.page-faq .contact-aside__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--c-rock);
}
.page-faq .contact-aside__text {
  margin: 0 0 12px;
  font-size: 14.2px;
  line-height: 1.75;
  color: var(--text-dim);
}
.page-faq .contact-aside__text a {
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(23, 224, 210, 0.4);
}
.page-faq .contact-aside__text a:hover {
  border-bottom-color: var(--c-cyan);
}
.page-faq .contact-aside__legal {
  margin: 18px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--line-soft);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--c-rock);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-faq .topic-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-faq .hot-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-faq .fb-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 980px) {
  .page-faq .faq-hero__inner {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  }
  .page-faq .steps-layout {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
  }
  .page-faq .faq-split {
    grid-template-columns: 236px minmax(0, 1fr);
    gap: 42px;
  }
  .page-faq .faq-rail {
    position: sticky;
    top: calc(var(--header-h) + 20px);
  }
  .page-faq .faq-rail__list {
    grid-template-columns: 1fr;
  }
  .page-faq .contact-split {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
    gap: 40px;
  }
}

@media (min-width: 1140px) {
  .page-faq .topic-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-faq .fb-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq *,
  .page-faq *::before,
  .page-faq *::after {
    animation: none !important;
    transition: none !important;
  }
}