.page-faq {
  --faq-gap: clamp(40px, 6vw, 76px);
  --faq-panel: rgba(19, 41, 74, 0.62);
  --faq-panel-strong: rgba(19, 41, 74, 0.92);
  --faq-rule: rgba(154, 166, 178, 0.22);
  --faq-glow: rgba(52, 225, 214, 0.16);
  --faq-warm: rgba(233, 182, 92, 0.06);

  position: relative;
  background:
    radial-gradient(920px 460px at 88% -6%, rgba(52, 225, 214, 0.10), transparent 62%),
    radial-gradient(760px 420px at 4% 34%, rgba(255, 111, 94, 0.07), transparent 66%),
    var(--ink);
  color: var(--paper);
  font-family: var(--font-sans);
  padding: calc(var(--rhythm-h) + 28px) 0 80px;
  overflow-x: hidden;
}

.page-faq .page-shell {
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 18px;
  box-sizing: border-box;
}

.page-faq .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  letter-spacing: 0.04em;
  margin-bottom: 26px;
}

.page-faq .breadcrumbs__link {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.18s ease, border-color 0.18s ease;
}

.page-faq .breadcrumbs__link:hover,
.page-faq .breadcrumbs__link:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
  outline: none;
}

.page-faq .breadcrumbs__sep {
  color: rgba(154, 166, 178, 0.55);
}

.page-faq .breadcrumbs__item {
  color: var(--paper);
}

.page-faq .mono {
  font-family: var(--font-mono);
  font-variant-ligatures: none;
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  padding-bottom: var(--faq-gap);
  border-bottom: 1px solid var(--faq-rule);
}

.page-faq .eyebrow {
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
  margin: 0 0 16px;
}

.page-faq .faq-hero__title {
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.page-faq .faq-hero__title-main {
  font-size: clamp(40px, 9vw, 76px);
  font-weight: 900;
  line-height: 1.02;
  letter-spacing: 0.04em;
  color: var(--paper);
}

.page-faq .faq-hero__title-sub {
  font-size: clamp(17px, 2.6vw, 26px);
  font-weight: 500;
  line-height: 1.5;
  letter-spacing: 0.02em;
  color: var(--mist);
  max-width: 22ch;
}

.page-faq .faq-hero__lede {
  margin: 24px 0 0;
  max-width: 36em;
  font-size: 17px;
  line-height: 1.78;
  color: rgba(242, 239, 230, 0.82);
}

.page-faq .faq-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 20px 44px;
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
}

.page-faq .faq-stats__item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-left: 14px;
  border-left: 2px solid var(--faq-rule);
}

.page-faq .data-number {
  font-family: var(--font-mono);
  font-size: clamp(32px, 5vw, 50px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-faq .data-number--coral { color: var(--coral); }
.page-faq .data-number--gold { color: var(--gold); }

.page-faq .faq-stats__label {
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

/* ---------- 区块骨架 ---------- */

.page-faq .faq-block {
  padding: var(--faq-gap) 0;
  border-bottom: 1px solid var(--faq-rule);
}

.page-faq .faq-block--last {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-faq .section-head {
  max-width: 44em;
  margin-bottom: 34px;
}

.page-faq .section-kicker {
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--coral);
  margin: 0 0 12px;
}

.page-faq .section-title {
  margin: 0 0 14px;
  font-size: clamp(24px, 4.4vw, 38px);
  font-weight: 800;
  line-height: 1.28;
  letter-spacing: 0.02em;
  color: var(--paper);
}

.page-faq .section-lede {
  margin: 0;
  font-size: 16px;
  line-height: 1.78;
  color: rgba(242, 239, 230, 0.72);
}

/* ---------- 换设备步骤 ---------- */

.page-faq .switch-grid {
  display: grid;
  gap: 26px;
}

.page-faq .step-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.page-faq .step-card {
  display: grid;
  grid-template-columns: 22px 1fr;
  gap: 14px;
  align-items: start;
  padding: 18px 18px 18px 16px;
  border: 1px solid var(--faq-rule);
  border-left: 2px solid var(--cyan);
  background: var(--faq-panel);
  cursor: pointer;
  transition: border-color 0.2s ease, background 0.2s ease;
}

.page-faq .step-card:hover,
.page-faq .step-card:focus-within {
  border-color: rgba(52, 225, 214, 0.55);
  border-left-color: var(--coral);
  background: var(--faq-panel-strong);
}

.page-faq .step-card__check {
  width: 18px;
  height: 18px;
  margin: 3px 0 0;
  accent-color: var(--cyan);
  cursor: pointer;
}

.page-faq .step-card__check:checked ~ .step-card__body {
  opacity: 0.55;
}

.page-faq .step-card__body {
  display: flex;
  flex-direction: column;
  gap: 6px;
  transition: opacity 0.2s ease;
}

.page-faq .step-card__number {
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

.page-faq .step-card__title {
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--paper);
}

.page-faq .step-card__text {
  font-size: 15px;
  line-height: 1.75;
  color: rgba(242, 239, 230, 0.72);
}

.page-faq .image-frame {
  margin: 0;
  border: 1px solid var(--faq-rule);
  background: var(--ink-deep);
  padding: 10px;
}

.page-faq .image-frame img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 3 / 2;
}

.page-faq .image-frame__caption {
  display: block;
  margin-top: 12px;
  padding-left: 10px;
  border-left: 2px solid var(--gold);
  font-size: 12.5px;
  line-height: 1.6;
  letter-spacing: 0.02em;
  color: var(--mist);
}

.page-faq .alert-panel {
  margin-top: 26px;
  padding: 20px 20px 18px;
  border: 1px solid rgba(233, 182, 92, 0.32);
  background: var(--faq-warm);
}

.page-faq .alert-panel__title {
  margin: 0 0 12px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--gold);
}

.page-faq .alert-panel__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.page-faq .alert-panel__list li {
  position: relative;
  padding-left: 16px;
  font-size: 14.5px;
  line-height: 1.72;
  color: rgba(242, 239, 230, 0.78);
}

.page-faq .alert-panel__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.68em;
  width: 6px;
  height: 6px;
  background: var(--gold);
  transform: rotate(45deg);
}

.page-faq .alert-panel__list strong {
  color: var(--paper);
  font-weight: 700;
}

/* ---------- 问答折叠 ---------- */

.page-faq .qa-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  max-width: 62em;
}

.page-faq .qa {
  border: 1px solid var(--faq-rule);
  border-left: 3px solid transparent;
  background: var(--faq-panel);
  transition: border-color 0.2s ease, background 0.2s ease;
}

.page-faq .qa:hover {
  border-color: var(--faq-rule);
  border-left-color: rgba(255, 111, 94, 0.5);
}

.page-faq .qa[open] {
  border-left-color: var(--coral);
  background: var(--faq-panel-strong);
}

.page-faq .qa__q {
  position: relative;
  cursor: pointer;
  list-style: none;
  padding: 17px 46px 17px 18px;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.6;
  letter-spacing: 0.02em;
  color: var(--paper);
}

.page-faq .qa__q::-webkit-details-marker { display: none; }
.page-faq .qa__q::marker { content: ""; }

.page-faq .qa__q::after {
  content: "+";
  position: absolute;
  right: 18px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1;
  color: var(--cyan);
  transition: color 0.2s ease;
}

.page-faq .qa[open] .qa__q::after {
  content: "–";
  color: var(--coral);
}

.page-faq .qa__q:focus-visible {
  outline: 1px solid var(--cyan);
  outline-offset: -3px;
}

.page-faq .qa__a {
  padding: 0 18px 18px;
  border-top: 1px solid var(--faq-rule);
  margin-top: -1px;
}

.page-faq .qa__a p {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(242, 239, 230, 0.76);
}

/* ---------- 服务清单定位 ---------- */

.page-faq .locate-list {
  display: flex;
  flex-direction: column;
  gap: 1px;
  background: var(--faq-rule);
  border: 1px solid var(--faq-rule);
}

.page-faq .locate-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  padding: 20px 18px;
  background: var(--ink);
}

.page-faq .tag {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  align-self: start;
  padding: 5px 10px;
  font-size: 12px;
  letter-spacing: 0.1em;
  border: 1px solid currentColor;
  white-space: nowrap;
}

.page-faq .tag--cyan { color: var(--cyan); }
.page-faq .tag--moss { color: #7FB894; }
.page-faq .tag--gold { color: var(--gold); }

.page-faq .locate-row__body { min-width: 0; }

.page-faq .locate-row__title {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--paper);
}

.page-faq .locate-row__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: rgba(242, 239, 230, 0.72);
}

.page-faq .further {
  margin: 22px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist);
}

.page-faq .further__link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(52, 225, 214, 0.45);
  padding-bottom: 1px;
  transition: color 0.18s ease, border-color 0.18s ease;
}

.page-faq .further__link:hover,
.page-faq .further__link:focus-visible {
  color: var(--coral);
  border-bottom-color: var(--coral);
  outline: none;
}

/* ---------- 分类浏览 ---------- */

.page-faq .topic-banner {
  position: relative;
  margin: 0 0 28px;
  border: 1px solid var(--faq-rule);
  overflow: hidden;
}

.page-faq .topic-banner img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 2 / 1;
  opacity: 0.5;
  filter: saturate(0.7);
}

.page-faq .topic-banner .image-frame__caption {
  position: absolute;
  left: 14px;
  bottom: 12px;
  margin: 0;
  color: rgba(242, 239, 230, 0.82);
  background: rgba(11, 26, 46, 0.72);
  padding: 6px 12px;
  border-left: 2px solid var(--cyan);
  backdrop-filter: blur(2px);
}

.page-faq .cat-browser {
  position: relative;
}

.page-faq .cat-radio {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.page-faq .cat-rail {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 10px;
  margin-bottom: 22px;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.page-faq .cat-tab {
  flex: 0 0 auto;
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 10px 14px;
  border: 1px solid var(--faq-rule);
  background: var(--faq-panel);
  color: rgba(242, 239, 230, 0.78);
  font-size: 14px;
  line-height: 1.2;
  cursor: pointer;
  transition: border-color 0.2s ease, background 0.2s ease, color 0.2s ease;
}

.page-faq .cat-tab:hover {
  border-color: rgba(52, 225, 214, 0.5);
  color: var(--paper);
}

.page-faq .cat-tab__no {
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--mist);
}

.page-faq .cat-tab__count {
  font-size: 11px;
  color: var(--cyan);
}

.page-faq #cat-all:checked ~ .cat-rail .cat-tab[for="cat-all"],
.page-faq #cat-1:checked ~ .cat-rail .cat-tab[for="cat-1"],
.page-faq #cat-2:checked ~ .cat-rail .cat-tab[for="cat-2"],
.page-faq #cat-3:checked ~ .cat-rail .cat-tab[for="cat-3"],
.page-faq #cat-4:checked ~ .cat-rail .cat-tab[for="cat-4"],
.page-faq #cat-5:checked ~ .cat-rail .cat-tab[for="cat-5"],
.page-faq #cat-6:checked ~ .cat-rail .cat-tab[for="cat-6"],
.page-faq #cat-7:checked ~ .cat-rail .cat-tab[for="cat-7"],
.page-faq #cat-8:checked ~ .cat-rail .cat-tab[for="cat-8"] {
  border-color: var(--coral);
  background: rgba(255, 111, 94, 0.12);
  color: var(--paper);
}

.page-faq #cat-all:checked ~ .cat-rail .cat-tab[for="cat-all"] .cat-tab__no,
.page-faq #cat-1:checked ~ .cat-rail .cat-tab[for="cat-1"] .cat-tab__no,
.page-faq #cat-2:checked ~ .cat-rail .cat-tab[for="cat-2"] .cat-tab__no,
.page-faq #cat-3:checked ~ .cat-rail .cat-tab[for="cat-3"] .cat-tab__no,
.page-faq #cat-4:checked ~ .cat-rail .cat-tab[for="cat-4"] .cat-tab__no,
.page-faq #cat-5:checked ~ .cat-rail .cat-tab[for="cat-5"] .cat-tab__no,
.page-faq #cat-6:checked ~ .cat-rail .cat-tab[for="cat-6"] .cat-tab__no,
.page-faq #cat-7:checked ~ .cat-rail .cat-tab[for="cat-7"] .cat-tab__no,
.page-faq #cat-8:checked ~ .cat-rail .cat-tab[for="cat-8"] .cat-tab__no {
  color: var(--coral);
}

.page-faq #cat-1:checked ~ .cat-panel .cat-group:not([data-cat="1"]),
.page-faq #cat-2:checked ~ .cat-panel .cat-group:not([data-cat="2"]),
.page-faq #cat-3:checked ~ .cat-panel .cat-group:not([data-cat="3"]),
.page-faq #cat-4:checked ~ .cat-panel .cat-group:not([data-cat="4"]),
.page-faq #cat-5:checked ~ .cat-panel .cat-group:not([data-cat="5"]),
.page-faq #cat-6:checked ~ .cat-panel .cat-group:not([data-cat="6"]),
.page-faq #cat-7:checked ~ .cat-panel .cat-group:not([data-cat="7"]),
.page-faq #cat-8:checked ~ .cat-panel .cat-group:not([data-cat="8"]) {
  display: none;
}

.page-faq #cat-1:checked ~ .cat-panel .cat-group[data-cat="1"],
.page-faq #cat-2:checked ~ .cat-panel .cat-group[data-cat="2"],
.page-faq #cat-3:checked ~ .cat-panel .cat-group[data-cat="3"],
.page-faq #cat-4:checked ~ .cat-panel .cat-group[data-cat="4"],
.page-faq #cat-5:checked ~ .cat-panel .cat-group[data-cat="5"],
.page-faq #cat-6:checked ~ .cat-panel .cat-group[data-cat="6"],
.page-faq #cat-7:checked ~ .cat-panel .cat-group[data-cat="7"],
.page-faq #cat-8:checked ~ .cat-panel .cat-group[data-cat="8"] {
  animation: catFade 260ms ease both;
}

@keyframes catFade {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

.page-faq .cat-panel {
  display: flex;
  flex-direction: column;
  gap: 1px;
  background: var(--faq-rule);
  border: 1px solid var(--faq-rule);
}

.page-faq .cat-group {
  background: var(--ink);
  padding: 20px 18px 22px;
}

.page-faq .cat-group__title {
  margin: 0 0 14px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--paper);
}

.page-faq .cat-group__title .mono {
  margin-left: 8px;
  font-size: 11.5px;
  font-weight: 400;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.page-faq .doc-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-faq .doc-item {
  position: relative;
  padding-left: 20px;
  font-size: 14.5px;
  line-height: 1.7;
  color: rgba(242, 239, 230, 0.74);
  transition: color 0.18s ease;
}

.page-faq .doc-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 9px;
  height: 1px;
  background: var(--cyan);
  transition: width 0.18s ease, background 0.18s ease;
}

.page-faq .doc-item:hover {
  color: var(--paper);
}

.page-faq .doc-item:hover::before {
  width: 14px;
  background: var(--coral);
}

/* ---------- 联系收束 ---------- */

.page-faq .contact-band {
  display: flex;
  flex-direction: column;
  gap: 26px;
  padding: 30px 22px;
  border: 1px solid var(--faq-rule);
  background:
    linear-gradient(132deg, rgba(52, 225, 214, 0.09), transparent 58%),
    var(--ink-deep);
}

.page-faq .contact-band__title {
  margin: 0 0 12px;
  font-size: clamp(21px, 3.6vw, 30px);
  font-weight: 800;
  line-height: 1.35;
  letter-spacing: 0.02em;
  color: var(--paper);
}

.page-faq .contact-band__lede {
  margin: 0;
  max-width: 40em;
  font-size: 15.5px;
  line-height: 1.8;
  color: rgba(242, 239, 230, 0.76);
}

.page-faq .contact-band__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-faq .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 22px;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-decoration: none;
  border: 1px solid transparent;
  transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

.page-faq .btn--pulse {
  background: var(--coral);
  color: var(--black);
  border-color: var(--coral);
}

.page-faq .btn--pulse:hover,
.page-faq .btn--pulse:focus-visible {
  background: var(--gold);
  border-color: var(--gold);
  transform: translateY(-1px);
  outline: none;
}

.page-faq .btn--ghost {
  background: transparent;
  color: var(--cyan);
  border-color: rgba(52, 225, 214, 0.5);
}

.page-faq .btn--ghost:hover,
.page-faq .btn--ghost:focus-visible {
  color: var(--paper);
  border-color: var(--paper);
  outline: none;
}

/* ---------- 平板 ---------- */

@media (min-width: 700px) {
  .page-faq .page-shell {
    padding: 0 32px;
  }

  .page-faq .locate-row {
    grid-template-columns: 128px 1fr;
    align-items: start;
    gap: 20px;
    padding: 22px 22px;
  }

  .page-faq .cat-panel {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-faq .switch-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    align-items: start;
  }
}

/* ---------- 桌面 ---------- */

@media (min-width: 1024px) {
  .page-faq {
    padding-top: calc(var(--rhythm-h) + 48px);
    padding-bottom: 110px;
  }

  .page-faq .page-shell {
    margin-left: calc(var(--rail-w) + 4vw);
    margin-right: auto;
    max-width: 1120px;
    padding: 0 48px 0 0;
  }

  .page-faq .faq-hero {
    display: grid;
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    column-gap: 56px;
    align-items: end;
  }

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

  .page-faq .faq-hero__lede {
    grid-column: 2;
    grid-row: 2;
    margin-top: 0;
    align-self: end;
    padding-bottom: 6px;
  }

  .page-faq .faq-hero__title {
    grid-column: 1;
    grid-row: 2;
  }

  .page-faq .faq-stats {
    grid-column: 1 / -1;
    margin-top: 46px;
    gap: 0;
  }

  .page-faq .faq-stats__item {
    min-width: 190px;
  }

  .page-faq .cat-browser {
    display: grid;
    grid-template-columns: 236px minmax(0, 1fr);
    grid-template-rows: auto 1fr;
    column-gap: 32px;
  }

  .page-faq .cat-rail {
    grid-column: 1;
    grid-row: 1 / span 2;
    flex-direction: column;
    overflow: visible;
    position: sticky;
    top: calc(var(--rhythm-h) + 24px);
    align-self: start;
    gap: 6px;
    padding-bottom: 0;
    margin-bottom: 0;
    max-height: calc(100vh - var(--rhythm-h) - 56px);
    overflow-y: auto;
  }

  .page-faq .cat-tab {
    width: 100%;
    justify-content: flex-start;
    box-sizing: border-box;
  }

  .page-faq .cat-tab__count {
    margin-left: auto;
  }

  .page-faq .cat-panel {
    grid-column: 2;
    grid-row: 1 / span 2;
  }

  .page-faq .cat-panel {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-faq .contact-band {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: 48px;
    padding: 40px 36px;
  }

  .page-faq .contact-band__actions {
    flex: 0 0 auto;
    flex-direction: column;
    align-items: stretch;
  }
}

@media (min-width: 1280px) {
  .page-faq .cat-panel {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq *,
  .page-faq *::before,
  .page-faq *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}
<<<END>>>