.page-faq {
  --faq-gap: 10px;
  --faq-toc-bg: var(--paper-50);
  padding-bottom: 56px;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  padding-top: 24px;
}

.page-faq .faq-hero .crumbs {
  margin-bottom: 18px;
}

.page-faq .faq-hero__grid {
  align-items: start;
  row-gap: 24px;
}

.page-faq .faq-hero__kicker {
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--ice-deep);
  margin: 0 0 10px;
}

.page-faq .faq-hero h1 {
  font-size: clamp(1.9rem, 5vw, 3.1rem);
  line-height: 1.12;
  letter-spacing: -.02em;
  font-weight: 900;
  color: var(--ink-900);
  margin: 0 0 16px;
}

.page-faq .faq-hero__lede {
  font-size: 16.5px;
  line-height: 1.75;
  color: var(--ink-700);
  max-width: 60ch;
  margin: 0;
}

.page-faq .faq-hero__side {
  display: grid;
  gap: 0;
  border-top: 2px solid var(--ink-900);
}

.page-faq .faq-hero__stat {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 11px 0 11px 12px;
  border-bottom: 1px solid var(--grid-300);
  border-left: 3px solid var(--field-green);
}

.page-faq .faq-hero__statnum {
  font-size: 17px;
  font-weight: 700;
  color: var(--ink-900);
  min-width: 6.5em;
}

.page-faq .faq-hero__statlabel {
  font-size: 14px;
  color: var(--ink-700);
}

.page-faq .faq-hero__figure {
  margin: 26px auto 0;
}

/* ---------- 分类索引条 ---------- */
.page-faq .faq-toc {
  margin-top: 26px;
  background: var(--faq-toc-bg);
  border-top: 1px solid var(--grid-300);
  border-bottom: 1px solid var(--grid-300);
  z-index: 8;
}

.page-faq .faq-toc__inner {
  max-width: 1240px;
  margin: 0 auto;
  padding: 10px 18px;
  display: flex;
  align-items: center;
  gap: 14px;
}

.page-faq .faq-toc__label {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--ink-700);
  white-space: nowrap;
  flex: none;
}

.page-faq .faq-toc__list {
  display: flex;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0 0 2px;
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-faq .faq-toc__item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 11px;
  border: 1px solid var(--grid-300);
  background: var(--paper-50);
  text-decoration: none;
  color: var(--ink-900);
  white-space: nowrap;
  transition: border-color .12s var(--ease), background-color .12s var(--ease);
}

.page-faq .faq-toc__item::before {
  content: "";
  width: 8px;
  height: 8px;
  flex: none;
  background: var(--ink-900);
}

.page-faq .faq-toc__item--green::before { background: var(--field-green); }
.page-faq .faq-toc__item--orange::before { background: var(--sprint-orange); }
.page-faq .faq-toc__item--ice::before { background: var(--ice-blue); }
.page-faq .faq-toc__item--ink::before { background: var(--ink-900); }

.page-faq .faq-toc__item:hover,
.page-faq .faq-toc__item:focus-visible {
  border-color: var(--ink-900);
  background: var(--paper-200);
}

.page-faq .faq-toc__num {
  font-size: 12px;
  color: var(--ink-700);
}

.page-faq .faq-toc__txt {
  font-size: 13.5px;
  font-weight: 700;
}

/* ---------- 章节公共 ---------- */
.page-faq .faq-sec {
  padding-top: 44px;
  scroll-margin-top: calc(var(--strip-h) + 74px);
}

.page-faq .faq-head {
  margin-bottom: 18px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--grid-300);
}

.page-faq .faq-head__label {
  display: flex;
  align-items: center;
  gap: 9px;
  margin: 0 0 8px;
}

.page-faq .faq-head__dot {
  width: 11px;
  height: 11px;
  flex: none;
  background: var(--ink-900);
}

.page-faq .faq-head__dot--green { background: var(--field-green); }
.page-faq .faq-head__dot--orange { background: var(--sprint-orange); }
.page-faq .faq-head__dot--ice { background: var(--ice-blue); }
.page-faq .faq-head__dot--ink { background: var(--ink-900); }

.page-faq .faq-head__range {
  font-size: 12.5px;
  letter-spacing: .1em;
  color: var(--ink-700);
}

.page-faq .faq-head__title {
  font-size: clamp(1.25rem, 3.4vw, 1.85rem);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -.01em;
  color: var(--ink-900);
  margin: 0 0 6px;
}

.page-faq .faq-head__note {
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-700);
  margin: 0;
}

/* ---------- 问答列表 ---------- */
.page-faq .qa-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--faq-gap);
}

.page-faq .qa {
  background: var(--paper-50);
  border: 1px solid var(--grid-300);
  border-left: 3px solid var(--ink-900);
  scroll-margin-top: calc(var(--strip-h) + 74px);
  transition: background-color .16s var(--ease);
}

.page-faq .qa--green { border-left-color: var(--field-green); }
.page-faq .qa--orange { border-left-color: var(--sprint-orange); }
.page-faq .qa--ice { border-left-color: var(--ice-blue); }
.page-faq .qa--ink { border-left-color: var(--ink-900); }

.page-faq .qa[open] {
  background: var(--paper-200);
}

.page-faq .qa__q {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr) 18px;
  gap: 10px;
  align-items: start;
  padding: 13px 14px;
  cursor: pointer;
  list-style: none;
  transition: background-color .12s var(--ease);
}

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

.page-faq .qa__q:hover {
  background: var(--paper-200);
}

.page-faq .qa__num {
  font-size: 15px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--field-green);
}

.page-faq .qa--orange .qa__num { color: var(--orange-deep); }
.page-faq .qa--ice .qa__num { color: var(--ice-deep); }
.page-faq .qa--ink .qa__num { color: var(--ink-900); }

.page-faq .qa__text {
  font-size: 15.5px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--ink-900);
}

.page-faq .qa__icon {
  position: relative;
  width: 18px;
  height: 18px;
  margin-top: 3px;
}

.page-faq .qa__icon::before,
.page-faq .qa__icon::after {
  content: "";
  position: absolute;
  background: var(--ink-900);
  transition: transform .24s var(--ease), background-color .12s var(--ease);
}

.page-faq .qa__icon::before {
  left: 0;
  top: 8px;
  width: 18px;
  height: 2px;
}

.page-faq .qa__icon::after {
  left: 8px;
  top: 0;
  width: 2px;
  height: 18px;
}

.page-faq .qa[open] .qa__icon::after {
  transform: rotate(90deg);
  opacity: 0;
}

.page-faq .qa__q:hover .qa__icon::before,
.page-faq .qa__q:hover .qa__icon::after {
  background: var(--orange-deep);
}

.page-faq .qa__body {
  padding: 0 14px 14px 58px;
  border-top: 1px solid var(--grid-300);
  margin-top: 0;
  padding-top: 12px;
}

.page-faq .qa__body p {
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-700);
  margin: 0;
  max-width: 62ch;
}

.page-faq .qa__tools {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 10px;
}

.page-faq .qa__copy {
  appearance: none;
  font: inherit;
  font-family: var(--mono);
  font-size: 12px;
  padding: 3px 8px;
  background: transparent;
  border: 1px solid var(--grid-300);
  color: var(--ice-deep);
  cursor: pointer;
  transition: border-color .12s var(--ease), color .12s var(--ease);
}

.page-faq .qa__copy:hover {
  border-color: var(--ink-900);
  color: var(--ink-900);
}

/* ---------- 设备类分栏 ---------- */
.page-faq .faq-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  align-items: start;
}

.page-faq .qa-grid--single {
  grid-template-columns: 1fr;
}

.page-faq .faq-shot {
  margin: 0;
  aspect-ratio: 1 / 1;
}

.page-faq .faq-shot__note {
  margin: 12px 0 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--ink-700);
  padding-left: 12px;
  border-left: 3px solid var(--ice-blue);
}

/* ---------- 兜底联系 ---------- */
.page-faq .faq-contact {
  padding-top: 44px;
}

.page-faq .faq-contact__box {
  background: var(--ink-900);
  border: 2px solid var(--ink-900);
  box-shadow: var(--shadow-hard-lg);
  padding: 26px 20px 24px;
}

.page-faq .faq-contact__kicker {
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--sprint-orange);
  margin: 0 0 10px;
}

.page-faq .faq-contact__title {
  font-size: clamp(1.3rem, 3.6vw, 1.9rem);
  font-weight: 900;
  line-height: 1.22;
  letter-spacing: -.01em;
  color: var(--paper-50);
  margin: 0 0 12px;
}

.page-faq .faq-contact__lede {
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--paper-200);
  max-width: 62ch;
  margin: 0 0 20px;
}

.page-faq .faq-contact__rows {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--ink-700);
}

.page-faq .faq-contact__row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  padding: 12px 0;
  border-bottom: 1px solid var(--ink-700);
}

.page-faq .faq-contact__key {
  font-size: 13px;
  color: var(--grid-300);
  min-width: 5em;
  flex: none;
}

.page-faq .faq-contact__val {
  font-size: 15px;
  color: var(--paper-50);
  word-break: break-all;
}

.page-faq .faq-contact__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

/* ---------- 桌面端 ---------- */
@media (min-width: 900px) {
  .page-faq .faq-hero {
    padding-top: 34px;
  }

  .page-faq .qa-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px 14px;
    align-items: start;
  }

  .page-faq .qa-grid--single {
    grid-template-columns: 1fr;
  }

  .page-faq .faq-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 30px;
  }

  .page-faq .faq-contact__box {
    padding: 34px 32px 30px;
  }

  .page-faq .faq-contact__rows {
    max-width: 720px;
  }
}

@media (min-width: 1080px) {
  .page-faq .faq-toc {
    position: sticky;
    top: var(--strip-h);
  }

  .page-faq .faq-sec {
    padding-top: 56px;
  }
}

/* ---------- 动效收敛 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-faq .qa__icon::before,
  .page-faq .qa__icon::after,
  .page-faq .qa,
  .page-faq .qa__q,
  .page-faq .qa__copy,
  .page-faq .faq-toc__item {
    transition: none;
  }
}
</main>