.page-faq {
  padding: 28px 0 96px;
}

.page-faq .breadcrumb {
  margin-bottom: 26px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  padding-bottom: 32px;
}

.page-faq .faq-hero h1 {
  margin: 14px 0 0;
  font-size: clamp(28px, 5.2vw, 50px);
  line-height: 1.24;
  letter-spacing: 0.05em;
  color: var(--white);
  font-weight: 800;
  max-width: 20em;
}

.page-faq .faq-hero__lede {
  margin: 20px 0 0;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.78;
  color: var(--muted);
}

.page-faq .faq-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 26px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--white);
}

.page-faq .faq-hero__meta li {
  display: flex;
  align-items: center;
  gap: 8px;
}

.page-faq .faq-hero__meta li::before {
  content: "";
  width: 6px;
  height: 6px;
  background: var(--cyan);
  flex: none;
}

/* ---------- 布局骨架 ---------- */

.page-faq .faq-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

/* ---------- 左侧分类索引 ---------- */

.page-faq .faq-rail {
  border-top: 1px solid var(--line);
  padding-top: 14px;
}

.page-faq .faq-rail__title {
  margin: 0 0 10px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--muted);
  text-transform: uppercase;
}

.page-faq .faq-rail__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 4px;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-faq .faq-rail__item {
  flex: none;
}

.page-faq .faq-rail__link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
  text-decoration: none;
  white-space: nowrap;
  transition: border-color var(--t-fast), color var(--t-fast), background-color var(--t-fast);
}

.page-faq .faq-rail__idx {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--cyan-deep);
}

.page-faq .faq-rail__link:hover,
.page-faq .faq-rail__link:focus-visible {
  border-color: var(--cyan);
  color: var(--white);
}

.page-faq .faq-rail__link:active {
  background: var(--panel);
}

/* ---------- 问答分组 ---------- */

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

.page-faq .faq-group {
  padding-top: 26px;
  border-top: 1px solid var(--line);
  scroll-margin-top: 96px;
}

.page-faq .faq-group:target .faq-group__head h2 {
  color: var(--cyan);
}

.page-faq .faq-group__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 14px;
}

.page-faq .faq-group__no {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--cyan);
  flex: none;
}

.page-faq .faq-group__head h2 {
  margin: 0;
  font-size: clamp(20px, 2.6vw, 28px);
  letter-spacing: 0.05em;
  font-weight: 800;
  color: var(--white);
}

/* ---------- 单条问答 ---------- */

.page-faq .qa {
  border-bottom: 1px solid var(--line);
}

.page-faq .qa__q {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 16px 0;
  cursor: pointer;
  list-style: none;
}

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

.page-faq .qa__no {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--muted);
  padding-top: 6px;
  flex: none;
}

.page-faq .qa__text {
  font-size: 17px;
  font-weight: 700;
  line-height: 1.5;
  letter-spacing: 0.02em;
  color: var(--white);
  transition: color var(--t-fast);
}

.page-faq .qa__q:hover .qa__text,
.page-faq .qa__q:focus-visible .qa__text {
  color: var(--cyan);
}

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

.page-faq .qa__mark {
  width: 0;
  height: 0;
  margin-left: auto;
  margin-top: 10px;
  flex: none;
  border-left: 5px solid transparent;
  border-right: 5px solid transparent;
  border-top: 6px solid var(--muted);
  transition: transform var(--t-fast), border-top-color var(--t-fast);
}

.page-faq .qa[open] .qa__mark {
  transform: rotate(180deg);
  border-top-color: var(--cyan);
}

.page-faq .qa[open] .qa__text {
  color: var(--cyan-deep);
}

.page-faq .qa__body {
  padding: 0 0 20px 34px;
}

.page-faq .qa[open] .qa__body {
  animation: faq-drop var(--t-mid) ease-out;
}

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

.page-faq .qa__body p {
  margin: 0;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

.page-faq .qa__body a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--cyan-deep);
}

.page-faq .qa__body a:hover {
  border-bottom-color: var(--cyan);
}

/* 关键数字 */

.page-faq .faq-num {
  position: relative;
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  color: var(--cyan);
  border-bottom: 1px solid rgba(53, 242, 198, 0.5);
  cursor: help;
}

.page-faq .faq-num::after {
  content: attr(data-hint);
  position: absolute;
  left: 0;
  top: calc(100% + 8px);
  z-index: 6;
  width: max-content;
  max-width: 250px;
  padding: 8px 10px;
  background: var(--panel);
  border: 1px solid var(--line);
  color: var(--muted);
  font-family: var(--sans);
  font-size: 12px;
  line-height: 1.65;
  letter-spacing: 0;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--t-fast);
  pointer-events: none;
}

.page-faq .faq-num:hover::after,
.page-faq .faq-num:focus::after {
  opacity: 1;
  visibility: visible;
}

/* ---------- 图片位 ---------- */

.page-faq .faq-shot {
  margin: 6px 0 22px;
}

.page-faq .faq-figure--tall {
  margin: 0;
}

/* ---------- 设备章节双栏 ---------- */

.page-faq .faq-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
}

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

/* ---------- 收尾区块 ---------- */

.page-faq .faq-group--help {
  padding-bottom: 8px;
}

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

.page-faq .faq-help__lead {
  margin: 0 0 16px;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

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

.page-faq .faq-help__list li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

.page-faq .faq-help__k {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--cyan);
  min-width: 5.5em;
}

.page-faq .faq-help__col--contact {
  padding: 20px;
  background: var(--panel);
  border: 1px solid var(--line);
}

.page-faq .faq-help__mail {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin: 0 0 14px;
}

.page-faq .faq-help__label {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--muted);
}

.page-faq .faq-help__value {
  font-family: var(--mono);
  font-size: 15px;
  letter-spacing: 0.02em;
  color: var(--white);
  overflow-wrap: anywhere;
}

.page-faq .faq-help__note {
  margin: 0 0 18px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

.page-faq .faq-help__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0;
}

/* ---------- 响应式 ---------- */

@media (min-width: 760px) {
  .page-faq .faq-help {
    grid-template-columns: minmax(0, 1fr) minmax(0, 320px);
    gap: 36px;
  }

  .page-faq .faq-group {
    padding-top: 34px;
  }

  .page-faq .qa__body {
    padding-left: 46px;
  }

  .page-faq .qa__text {
    font-size: 18px;
  }
}

@media (min-width: 980px) {
  .page-faq {
    padding: 40px 0 120px;
  }

  .page-faq .breadcrumb {
    margin-bottom: 34px;
  }

  .page-faq .faq-layout {
    grid-template-columns: 220px minmax(0, 1fr);
    gap: 56px;
    margin-top: 8px;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: 100px;
    align-self: start;
    border-top: 1px solid var(--line);
    padding-top: 16px;
  }

  .page-faq .faq-rail__list {
    flex-direction: column;
    gap: 6px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-faq .faq-rail__link {
    white-space: normal;
    justify-content: flex-start;
  }

  .page-faq .faq-split {
    grid-template-columns: minmax(0, 1fr) 260px;
    gap: 32px;
  }
}

@media (min-width: 1280px) {
  .page-faq .faq-layout {
    grid-template-columns: 240px minmax(0, 1fr);
    gap: 72px;
  }

  .page-faq .faq-split {
    grid-template-columns: minmax(0, 1fr) 300px;
  }

  .page-faq .qa__q {
    padding: 20px 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa[open] .qa__body {
    animation: none;
  }

  .page-faq .qa__mark,
  .page-faq .qa__text,
  .page-faq .faq-rail__link {
    transition: none;
  }
}