.page-faq {
  --faq-cut: 18px;
  --faq-acc-device: var(--jade);
  --faq-acc-feature: var(--cyan);
  --faq-acc-account: var(--gold);
  --faq-acc-security: var(--ruby);
  display: block;
  background:
    radial-gradient(72% 42% at 92% 3%, rgba(58, 208, 222, .08), transparent 66%),
    linear-gradient(180deg, var(--ink) 0%, var(--void) 58%, var(--ink) 100%);
}

.page-faq [data-cat="device"] { --faq-accent: var(--faq-acc-device); }
.page-faq [data-cat="feature"] { --faq-accent: var(--faq-acc-feature); }
.page-faq [data-cat="account"] { --faq-accent: var(--faq-acc-account); }
.page-faq [data-cat="security"] { --faq-accent: var(--faq-acc-security); }
.page-faq [data-cat="all"] { --faq-accent: var(--gold); }

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding: 92px 0 0;
  overflow: hidden;
}

.page-faq .faq-hero__glow {
  position: absolute;
  top: -180px;
  right: -120px;
  width: 520px;
  height: 520px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(215, 168, 78, .16), transparent 68%);
  pointer-events: none;
}

.page-faq .faq-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  align-items: start;
}

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

.page-faq .faq-hero .breadcrumb { margin-bottom: 24px; }

.page-faq .faq-hero__eyebrow { margin: 0 0 18px; }

.page-faq .faq-hero__title {
  margin: 0 0 22px;
  font-size: clamp(34px, 8vw, 58px);
  line-height: 1.06;
  letter-spacing: -0.01em;
}

.page-faq .faq-hero__lede {
  max-width: 34em;
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--body-text);
}

/* 尺寸自检微组件 */
.page-faq .faq-check {
  margin-top: 32px;
  padding: 22px 20px 24px;
  background: linear-gradient(155deg, rgba(20, 31, 58, .94), rgba(5, 8, 15, .88));
  border: 1px solid var(--line);
  clip-path: polygon(0 0, calc(100% - var(--faq-cut)) 0, 100% var(--faq-cut), 100% 100%, var(--faq-cut) 100%, 0 calc(100% - var(--faq-cut)));
}

.page-faq .faq-check__label {
  margin: 0;
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--gold);
}

.page-faq .faq-check__row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
}

.page-faq .faq-check__input,
.page-faq .faq-rail__input,
.page-faq .faq-item__toggle,
.page-faq .faq-expand__input {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.page-faq .faq-check__chip {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .05em;
  color: var(--mist);
  background: rgba(154, 166, 188, .08);
  border: 1px solid var(--line-soft);
  cursor: pointer;
  transition: color 160ms var(--ease), background 160ms var(--ease), border-color 160ms var(--ease);
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 12px 100%, 0 calc(100% - 12px));
}

.page-faq .faq-check__input:checked + .faq-check__chip {
  color: var(--void);
  background: linear-gradient(135deg, var(--gold-hi), var(--gold));
  border-color: var(--gold);
}

.page-faq .faq-check__input:focus-visible + .faq-check__chip {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-faq .faq-check__res {
  display: none;
  margin: 18px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--gold);
  font-size: 14px;
  line-height: 1.75;
  color: var(--body-text);
}

.page-faq:has(#fs-0:checked) .faq-check__res--0,
.page-faq:has(#fs-a:checked) .faq-check__res--a,
.page-faq:has(#fs-b:checked) .faq-check__res--b,
.page-faq:has(#fs-c:checked) .faq-check__res--c,
.page-faq:has(#fs-d:checked) .faq-check__res--d {
  display: block;
}

@supports not (selector(:has(*))) {
  .page-faq .faq-check__res--a { display: block; }
}

/* 首屏视觉 */
.page-faq .faq-hero__visual {
  position: relative;
  min-width: 0;
  margin-bottom: 48px;
}

.page-faq .faq-hero__frame {
  margin: 0;
  transform: rotate(-1.2deg);
}

.page-faq .faq-hero__badge {
  position: absolute;
  right: 10px;
  bottom: -16px;
}

.page-faq .faq-hero .spectrum-bar {
  margin-top: 8px;
}

/* ---------- 本季高频 ---------- */
.page-faq .faq-top__head { max-width: 40em; }

.page-faq .faq-top__head .section-title { margin: 12px 0 10px; }

.page-faq .faq-top__note {
  margin: 0;
  font-size: 15px;
}

.page-faq .faq-top__list {
  list-style: none;
  margin: 36px 0 0;
  padding: 0;
  border-top: 1px solid var(--line-soft);
}

.page-faq .faq-top__item {
  position: relative;
  padding: 24px 0 24px 24px;
  border-bottom: 1px solid var(--line-soft);
}

.page-faq .faq-top__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 28px;
  bottom: 28px;
  width: 2px;
  background: var(--faq-accent, var(--gold));
}

.page-faq .faq-top__num {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--faq-accent, var(--gold));
}

.page-faq .faq-top__q {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--ivory);
}

.page-faq .faq-top__a {
  margin: 0;
  max-width: 46em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--body-text);
}

/* ---------- 设备实拍带 ---------- */
.page-faq .faq-band__frame {
  margin: 0;
  border: 1px solid var(--line-soft);
}

/* ---------- 分类归档 ---------- */
.page-faq .faq-archive__head {
  max-width: 40em;
  margin-bottom: 32px;
}

.page-faq .faq-archive__head .section-title { margin: 12px 0 0; }

.page-faq .faq-archive__layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}

.page-faq .faq-rail__hint {
  margin: 0 0 14px;
  font-size: 13px;
}

.page-faq .faq-rail__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-faq .faq-rail__item {
  display: flex;
  align-items: center;
  gap: 7px;
  min-height: 46px;
  padding: 8px 14px;
  font-size: 14px;
  color: var(--mist);
  background: rgba(20, 31, 58, .55);
  border: 1px solid var(--line-soft);
  border-left: 3px solid var(--line-soft);
  cursor: pointer;
  transition: color 160ms var(--ease), border-color 160ms var(--ease), background 160ms var(--ease);
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 14px 100%, 0 calc(100% - 14px));
}

.page-faq .faq-rail__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--faq-accent, var(--gold));
}

.page-faq .faq-rail__slash {
  color: var(--line);
  transform: skewX(-14deg);
}

.page-faq .faq-rail__name {
  flex: 1;
  font-weight: 500;
}

.page-faq .faq-rail__count {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--mist);
}

.page-faq .faq-rail__input:checked + .faq-rail__item {
  color: var(--ivory);
  background: rgba(20, 31, 58, .95);
  border-color: var(--faq-accent, var(--gold));
  border-left-color: var(--faq-accent, var(--gold));
}

.page-faq .faq-rail__input:focus-visible + .faq-rail__item {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-faq .faq-rail__foot {
  margin: 20px 0 0;
  font-size: 13px;
  line-height: 1.75;
}

/* 列表头 */
.page-faq .faq-list { min-width: 0; }

.page-faq .faq-list__bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-list__hint {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--mist);
}

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

.page-faq .faq-expand__input:checked ~ .faq-expand__btn .faq-expand__on { display: none; }

.page-faq .faq-expand__input:checked ~ .faq-expand__btn .faq-expand__off { display: inline; }

.page-faq .faq-expand__input:focus-visible ~ .faq-expand__btn {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

/* 条目 */
.page-faq .faq-item {
  border-bottom: 1px solid var(--line-soft);
}

.page-faq .faq-item__head {
  position: relative;
  display: flex;
  align-items: flex-start;
  gap: 12px;
  min-height: 56px;
  padding: 18px 12px 18px 14px;
  cursor: pointer;
  transition: background 160ms var(--ease);
}

.page-faq .faq-item__head::before {
  content: "";
  position: absolute;
  left: 0;
  top: 20px;
  bottom: 20px;
  width: 2px;
  background: var(--faq-accent, var(--gold));
  opacity: .45;
  transition: opacity 160ms var(--ease);
}

.page-faq .faq-item__num {
  flex: none;
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--faq-accent, var(--gold));
}

.page-faq .faq-item__q {
  flex: 1;
  min-width: 0;
  font-size: 16px;
  font-weight: 500;
  line-height: 1.6;
  color: var(--ivory);
}

.page-faq .faq-item__icon {
  position: relative;
  flex: none;
  width: 20px;
  height: 20px;
  margin-top: 4px;
}

.page-faq .faq-item__icon::before,
.page-faq .faq-item__icon::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  background: var(--gold);
  transform: translate(-50%, -50%);
  transition: transform 220ms var(--ease), opacity 220ms var(--ease);
}

.page-faq .faq-item__icon::before { width: 14px; height: 1.5px; }
.page-faq .faq-item__icon::after { width: 1.5px; height: 14px; }

.page-faq .faq-item__panel {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 240ms var(--ease);
}

.page-faq .faq-item__inner { overflow: hidden; }

.page-faq .faq-item__toggle:checked ~ .faq-item__head::before { opacity: 1; }

.page-faq .faq-item__toggle:checked ~ .faq-item__head .faq-item__icon::after {
  transform: translate(-50%, -50%) rotate(90deg);
  opacity: 0;
}

.page-faq .faq-item__toggle:checked ~ .faq-item__panel { grid-template-rows: 1fr; }

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

.page-faq .faq-item__body { padding: 2px 14px 0; }

.page-faq .faq-item__body p {
  margin: 0 0 14px;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--body-text);
}

.page-faq .faq-item__body p:last-child { margin-bottom: 22px; }

.page-faq .faq-item__body a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* 全部展开覆盖 */
.page-faq:has(#faq-expand-all:checked) .faq-item__panel { grid-template-rows: 1fr; }

.page-faq:has(#faq-expand-all:checked) .faq-item__head::before { opacity: 1; }

.page-faq:has(#faq-expand-all:checked) .faq-item__head .faq-item__icon::after {
  transform: translate(-50%, -50%) rotate(90deg);
  opacity: 0;
}

/* 分类筛选 */
.page-faq:has(#cat-device:checked) .faq-item:not([data-cat="device"]),
.page-faq:has(#cat-feature:checked) .faq-item:not([data-cat="feature"]),
.page-faq:has(#cat-account:checked) .faq-item:not([data-cat="account"]),
.page-faq:has(#cat-security:checked) .faq-item:not([data-cat="security"]) {
  display: none;
}

/* ---------- 未解决提示条 ---------- */
.page-faq .faq-help__panel {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  padding: 32px 24px;
  background: linear-gradient(140deg, rgba(225, 68, 95, .14), rgba(20, 31, 58, .92) 46%, rgba(5, 8, 15, .96));
  border: 1px solid var(--line-soft);
  border-left: 3px solid var(--ruby);
  clip-path: polygon(0 0, calc(100% - 26px) 0, 100% 26px, 100% 100%, 26px 100%, 0 calc(100% - 26px));
}

.page-faq .faq-help__copy .section-title { margin: 12px 0 12px; }

.page-faq .faq-help__text {
  margin: 0;
  max-width: 38em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--body-text);
}

.page-faq .faq-help__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-content: start;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-faq .faq-hero { padding-top: 112px; }

  .page-faq .faq-hero__lede { font-size: 17px; }

  .page-faq .faq-top__item {
    display: grid;
    grid-template-columns: 44px minmax(0, 1fr);
    column-gap: 14px;
    padding-left: 26px;
  }

  .page-faq .faq-top__num { grid-column: 1; margin-top: 3px; }

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

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

  .page-faq .faq-item__body { padding-left: 26px; padding-right: 26px; }

  .page-faq .faq-help__panel {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    padding: 40px 36px;
  }
}

@media (min-width: 960px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 56px;
    align-items: center;
  }

  .page-faq .faq-hero__visual { margin-bottom: 0; }

  .page-faq .faq-hero__title { font-size: clamp(38px, 4.4vw, 56px); }
}

@media (min-width: 1024px) {
  .page-faq .faq-archive__layout {
    grid-template-columns: 250px minmax(0, 1fr);
    gap: 52px;
    align-items: start;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: calc(var(--header-h) + 24px);
  }

  .page-faq .faq-rail__list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 6px;
  }

  .page-faq .faq-rail__item { width: 100%; }

  .page-faq .faq-top__item {
    grid-template-columns: 64px minmax(0, 1fr);
  }
}

@media (hover: hover) {
  .page-faq .faq-check__chip:hover {
    color: var(--ivory);
    border-color: var(--line);
  }

  .page-faq .faq-rail__item:hover {
    color: var(--ivory);
    border-color: var(--line);
    border-left-color: var(--faq-accent, var(--gold));
  }

  .page-faq .faq-item__head:hover { background: rgba(154, 166, 188, .05); }

  .page-faq .faq-item__head:hover .faq-item__icon::before,
  .page-faq .faq-item__head:hover .faq-item__icon::after {
    background: var(--gold-hi);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item__panel,
  .page-faq .faq-item__icon::before,
  .page-faq .faq-item__icon::after,
  .page-faq .faq-check__chip,
  .page-faq .faq-rail__item {
    transition: none;
  }

  .page-faq .faq-hero__frame { transform: none; }
}