/* ===== 常见问答 · 页面作用域 ===== */
.page-faq {
  --faq-cut: var(--c-ink);
  color: var(--c-paper);
}

/* 首屏 */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: 34px 0 32px;
  border-bottom: 1px solid var(--line-14);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  top: -170px;
  right: -190px;
  width: 460px;
  height: 460px;
  background: radial-gradient(circle at 34% 34%, rgba(61, 245, 138, 0.15), transparent 64%);
  pointer-events: none;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 132px;
  height: 3px;
  background: linear-gradient(90deg, var(--c-lime), var(--c-cyan));
}

.page-faq .faq-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-narrow);
  font-size: clamp(27px, 5.4vw, 42px);
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -0.01em;
  max-width: 21ch;
}

.page-faq .faq-hero__lede {
  margin: 16px 0 0;
  max-width: 64ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--paper-72);
}

.page-faq .faq-stats {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line-14);
  border: 1px solid var(--line-14);
  border-radius: var(--r-sm);
  overflow: hidden;
}

.page-faq .faq-stats > li {
  background: var(--c-ink-2);
  padding: 14px 16px;
}

.page-faq .faq-stats__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--c-lime);
}

.page-faq .faq-stats__label {
  display: block;
  margin-top: 4px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--paper-52);
}

/* 主体骨架 */
.page-faq .faq-body {
  padding: 30px 0 66px;
}

.page-faq .faq-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 30px;
}

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

/* 左侧情景索引 */
.page-faq .faq-rail__head {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--paper-52);
}

.page-faq .faq-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-faq .faq-rail__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 12px;
  border: 1px solid var(--line-20);
  border-radius: var(--r-sm);
  font-size: 13px;
  color: var(--paper-72);
  text-decoration: none;
  transition: border-color 160ms var(--ease), color 160ms var(--ease);
}

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

.page-faq .faq-rail__num {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  color: var(--c-cyan);
}

/* 情景分组 */
.page-faq .faq-group {
  margin-bottom: 46px;
  scroll-margin-top: 104px;
}

.page-faq .faq-groups > .faq-group:last-child {
  margin-bottom: 0;
}

.page-faq .faq-group__label {
  display: inline-block;
  padding: 4px 10px;
  background: var(--c-sand);
  color: var(--c-ink);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.06em;
  border-radius: var(--r-sm);
  box-shadow: 2px 2px 0 rgba(7, 17, 28, 0.6);
}

.page-faq .faq-group__title {
  margin: 14px 0 6px;
  font-family: var(--font-narrow);
  font-size: 21px;
  font-weight: 800;
  letter-spacing: -0.01em;
  line-height: 1.4;
}

.page-faq .faq-group__desc {
  margin: 0 0 18px;
  max-width: 62ch;
  font-size: 14px;
  line-height: 1.75;
  color: var(--paper-52);
}

/* 折叠问答行 */
.page-faq .faq-list {
  border-top: 1px solid var(--line-20);
}

.page-faq .faq-item {
  border-bottom: 1px solid var(--line-14);
}

.page-faq .faq-item__q {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 15px 0;
  list-style: none;
  cursor: pointer;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.65;
  transition: color 160ms var(--ease);
}

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

.page-faq .faq-item__q:focus-visible {
  outline: 2px solid var(--c-cyan);
  outline-offset: 3px;
}

.page-faq .faq-item__num {
  flex: none;
  width: 30px;
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--c-cyan);
}

.page-faq .faq-item__text {
  flex: 1 1 auto;
  min-width: 0;
}

.page-faq .faq-item__sign {
  position: relative;
  flex: none;
  width: 14px;
  height: 14px;
  margin-top: 7px;
}

.page-faq .faq-item__sign::before,
.page-faq .faq-item__sign::after {
  content: "";
  position: absolute;
  background: var(--c-lime);
}

.page-faq .faq-item__sign::before {
  left: 0;
  top: 6px;
  width: 14px;
  height: 2px;
}

.page-faq .faq-item__sign::after {
  left: 6px;
  top: 0;
  width: 2px;
  height: 14px;
  transition: transform 160ms var(--ease), opacity 160ms var(--ease);
}

.page-faq .faq-item[open] .faq-item__sign::after {
  transform: scaleY(0);
  opacity: 0;
}

.page-faq .faq-item[open] .faq-item__text,
.page-faq .faq-item__q:hover .faq-item__text {
  color: var(--c-lime);
}

.page-faq .faq-item__a {
  padding: 0 0 18px 0;
  max-width: 68ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--paper-72);
  animation: faq-open 200ms var(--ease) both;
}

.page-faq .faq-item__a p {
  margin: 0 0 10px;
}

.page-faq .faq-item__a p:last-child {
  margin-bottom: 0;
}

.page-faq .faq-item__a a {
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(57, 198, 230, 0.42);
}

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

@keyframes faq-open {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* 图文容器 */
.page-faq .faq-figure {
  margin: 0 0 24px;
}

.page-faq .faq-figure__frame {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line-20);
  border-radius: var(--r-md);
  background: var(--c-ink-2);
}

.page-faq .faq-figure__frame img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-faq .faq-figure__frame::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: 24px;
  height: 24px;
  background: var(--faq-cut);
  clip-path: polygon(100% 0, 100% 100%, 0 100%);
  box-sizing: border-box;
}

.page-faq .faq-figure figcaption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--paper-52);
}

/* 帮助与反馈 */
.page-faq .faq-help {
  --faq-cut: var(--c-paper);
  margin-top: 8px;
  padding: 26px 18px;
  background: var(--c-paper);
  color: var(--c-ink);
  border: 1px solid var(--line-20);
  border-radius: var(--r-md);
  scroll-margin-top: 104px;
}

.page-faq .faq-help .eyebrow {
  color: rgba(11, 27, 43, 0.55);
}

.page-faq .faq-help__title {
  margin: 12px 0 8px;
  font-family: var(--font-narrow);
  font-size: 24px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--c-ink);
}

.page-faq .faq-help__lede {
  margin: 0 0 20px;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-58);
}

.page-faq .faq-check {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 6px;
}

.page-faq .faq-check__row {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 9px 12px;
  background: rgba(11, 27, 43, 0.045);
  border: 1px solid var(--ink-12);
  border-radius: var(--r-sm);
  cursor: pointer;
}

.page-faq .faq-check__box {
  appearance: none;
  -webkit-appearance: none;
  flex: none;
  width: 16px;
  height: 16px;
  margin: 3px 0 0;
  border: 1px solid var(--c-ink);
  border-radius: 1px;
  background: transparent;
  position: relative;
  cursor: pointer;
}

.page-faq .faq-check__box:checked {
  background: var(--c-lime);
}

.page-faq .faq-check__box:checked::after {
  content: "";
  position: absolute;
  left: 4px;
  top: 1px;
  width: 6px;
  height: 10px;
  border-right: 2px solid var(--c-ink);
  border-bottom: 2px solid var(--c-ink);
  transform: rotate(42deg);
}

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

.page-faq .faq-check__label {
  font-size: 14px;
  line-height: 1.7;
  color: var(--c-ink);
}

.page-faq .faq-help__actions {
  margin-top: 22px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-faq .faq-help .btn--ghost {
  color: var(--c-ink);
  border-color: var(--ink-58);
}

.page-faq .faq-help .btn--ghost:hover {
  background: var(--c-ink);
  color: var(--c-paper);
  border-color: var(--c-ink);
}

.page-faq .faq-help__side .faq-figure {
  margin: 22px 0 0;
}

.page-faq .faq-help__contact {
  margin: 18px 0 0;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 7px 14px;
  font-size: 14px;
}

.page-faq .faq-help__contact dt {
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: rgba(11, 27, 43, 0.55);
}

.page-faq .faq-help__contact dd {
  margin: 0;
  font-weight: 600;
  color: var(--c-ink);
  overflow-wrap: anywhere;
}

/* 640px 起 */
@media (min-width: 640px) {
  .page-faq .faq-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-faq .faq-item__a {
    padding-left: 42px;
  }

  .page-faq .faq-help {
    padding: 32px 26px;
  }

  .page-faq .faq-help__side .faq-figure {
    margin-top: 26px;
  }
}

/* 900px 起：帮助区左右分栏 */
@media (min-width: 900px) {
  .page-faq .faq-help {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 300px;
    gap: 38px;
    align-items: start;
    padding: 36px 32px;
  }

  .page-faq .faq-help__side .faq-figure {
    margin-top: 0;
  }
}

/* 1000px 起：左侧索引固定 */
@media (min-width: 1000px) {
  .page-faq .faq-hero {
    padding: 52px 0 40px;
  }

  .page-faq .faq-body {
    padding: 40px 0 80px;
  }

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

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

  .page-faq .faq-rail__list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 0;
    border-top: 1px solid var(--line-14);
  }

  .page-faq .faq-rail__link {
    width: 100%;
    justify-content: flex-start;
    padding: 11px 0;
    border: 0;
    border-bottom: 1px solid var(--line-08);
    border-radius: 0;
  }

  .page-faq .faq-group__title {
    font-size: 23px;
  }
}

/* 降低动效偏好 */
@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item__a,
  .page-faq .faq-item__sign::after,
  .page-faq .faq-item__q,
  .page-faq .faq-rail__link {
    animation: none;
    transition: none;
  }
}