.page-faq {
  --faq-sticky-top: 56px;
  display: block;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  margin-top: 16px;
  padding: 28px 0 36px;
  border-top: 2px solid var(--line);
  border-bottom: 2px solid var(--line);
  background:
    linear-gradient(180deg, rgba(57, 255, 136, .07), rgba(5, 7, 14, 0) 58%),
    var(--ink-800);
}

.page-faq .faq-hero__inner {
  display: grid;
  gap: 26px;
  align-items: start;
}

.page-faq .faq-hero h1 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-size: clamp(32px, 8vw, 58px);
  font-weight: 700;
  line-height: 1.06;
  letter-spacing: .01em;
  color: var(--white);
}

.page-faq .faq-hero__lede {
  margin: 16px 0 0;
  max-width: 42em;
  font-size: 17px;
  line-height: 1.75;
  color: var(--silver);
}

.page-faq .faq-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 22px;
}

.page-faq .faq-hero__media {
  margin: 0;
  border: 3px solid var(--line);
  background: var(--ink-700);
  box-shadow: var(--shadow);
}

.page-faq .faq-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.85) brightness(.78);
}

/* ---------- 搜索条 ---------- */
.page-faq .faq-search {
  position: sticky;
  top: var(--faq-sticky-top);
  z-index: 6;
  padding: 14px 0;
  background: var(--ink-900);
  border-bottom: 2px solid var(--line);
}

.page-faq .faq-search__inner {
  display: grid;
  gap: 10px;
}

.page-faq .faq-search__field {
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 54px;
  padding: 0 14px;
  border: 3px solid var(--line);
  background: var(--ink-700);
  transition: border-color .22s var(--ease), box-shadow .22s var(--ease);
}

.page-faq .faq-search__field:focus-within {
  border-color: var(--green);
  box-shadow: 0 0 0 4px rgba(57, 255, 136, .12);
}

.page-faq .faq-search__icon {
  flex: none;
  display: inline-flex;
  color: var(--green);
}

.page-faq .faq-search__label {
  display: none;
  flex: none;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--silver);
}

.page-faq .faq-search__input {
  flex: 1 1 auto;
  min-width: 0;
  min-height: 44px;
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--white);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.4;
  appearance: none;
  -webkit-appearance: none;
  outline: none;
}

.page-faq .faq-search__input::placeholder {
  color: var(--silver);
}

.page-faq .faq-search__input::-webkit-search-cancel-button {
  -webkit-appearance: none;
}

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

.page-faq .faq-jump {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 6px 12px;
  border: 2px solid var(--line);
  background: var(--ink-800);
  color: var(--silver);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .04em;
  text-decoration: none;
  transition: color .2s var(--ease), background .2s var(--ease), border-color .2s var(--ease);
}

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

/* ---------- 台面布局 ---------- */
.page-faq .faq-desk {
  display: grid;
  gap: 26px;
  padding: 32px 0 8px;
}

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

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

/* ---------- 问答画板 ---------- */
.page-faq .faq-board {
  margin-bottom: 30px;
  border: 2px solid var(--line);
  background: var(--ink-800);
  box-shadow: var(--shadow);
  scroll-margin-top: 132px;
}

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

.page-faq .faq-board__head {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 15px 16px;
  background: var(--ink-700);
  border-bottom: 2px solid var(--line);
}

.page-faq .faq-board__num {
  flex: none;
  font-family: var(--font-display);
  font-size: 38px;
  font-weight: 700;
  line-height: .9;
  letter-spacing: .02em;
  color: var(--green);
}

.page-faq .faq-board__title {
  margin: 0;
  font-size: 19px;
  font-weight: 900;
  line-height: 1.25;
  color: var(--white);
}

.page-faq .faq-board__count {
  margin-left: auto;
  flex: none;
}

.page-faq .faq-board__figure {
  margin: 0;
  border-bottom: 2px solid var(--line);
  background: var(--ink-700);
  overflow: hidden;
}

.page-faq .faq-board__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.8) brightness(.75);
}

/* ---------- 问答条 ---------- */
.page-faq .faq-item {
  position: relative;
  border-bottom: 2px solid var(--line);
  background: var(--ink-800);
  transition: background .2s var(--ease);
}

.page-faq .faq-item:last-child {
  border-bottom: 0;
}

.page-faq .faq-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: transparent;
  transition: background .22s var(--ease);
}

.page-faq .faq-item[open] {
  background: var(--ink-700);
}

.page-faq .faq-item[open]::before {
  background: var(--green);
}

.page-faq .faq-item > summary {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  min-height: 44px;
  padding: 16px 14px 16px 18px;
  cursor: pointer;
  list-style: none;
  color: var(--white);
  font-size: 16px;
  font-weight: 700;
  line-height: 1.55;
}

.page-faq .faq-item > summary::-webkit-details-marker {
  display: none;
}

.page-faq .faq-item > summary::marker {
  content: "";
}

.page-faq .faq-item > summary:focus-visible {
  outline: 2px solid var(--green);
  outline-offset: -2px;
}

.page-faq .faq-item__num {
  flex: none;
  min-width: 24px;
  padding-top: 3px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--silver);
  transition: color .2s var(--ease);
}

.page-faq .faq-item[open] .faq-item__num {
  color: var(--green);
}

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

.page-faq .faq-item__mark {
  flex: none;
  display: grid;
  place-items: center;
  width: 26px;
  height: 26px;
  margin-left: 4px;
  border: 2px solid var(--line);
  color: var(--green);
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 600;
  line-height: 1;
}

.page-faq .faq-item__mark::after {
  content: "+";
}

.page-faq .faq-item[open] .faq-item__mark {
  border-color: var(--green);
  background: var(--green-dim);
  color: var(--white);
}

.page-faq .faq-item[open] .faq-item__mark::after {
  content: "\2212";
}

.page-faq .faq-item__a {
  padding: 0 16px 18px 16px;
  color: var(--silver);
  font-size: 16px;
  line-height: 1.75;
}

.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 strong {
  color: var(--white);
  font-weight: 700;
}

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

.page-faq .faq-item__a a:hover,
.page-faq .faq-item__a a:focus-visible {
  color: var(--white);
}

.page-faq .faq-item__a mark {
  padding: 0 3px;
  background: rgba(255, 122, 26, .18);
  border-bottom: 2px solid var(--orange);
  color: var(--orange);
  font-weight: 700;
}

/* ---------- 排查清单 ---------- */
.page-faq .faq-check {
  display: grid;
  gap: 8px;
  margin: 12px 0 12px;
  padding: 0;
  list-style: none;
}

.page-faq .faq-check__row {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 10px 12px;
  border: 2px solid var(--line);
  background: var(--ink-800);
}

.page-faq .faq-check__box {
  flex: none;
  width: 18px;
  height: 18px;
  margin: 3px 0 0;
  accent-color: var(--green);
}

.page-faq .faq-check__row label {
  flex: 1 1 auto;
  cursor: pointer;
  color: var(--silver);
  font-size: 15px;
  line-height: 1.65;
}

.page-faq .faq-check__row:has(.faq-check__box:checked) {
  border-color: var(--green-dim);
}

.page-faq .faq-check__row:has(.faq-check__box:checked) label {
  color: var(--green);
  text-decoration: line-through;
  text-decoration-thickness: 1px;
}

/* ---------- 平板 ---------- */
@media (min-width: 600px) {
  .page-faq .faq-search__label {
    display: inline-block;
  }

  .page-faq .faq-board__head {
    padding: 18px 20px;
  }

  .page-faq .faq-board__num {
    font-size: 44px;
  }

  .page-faq .faq-board__title {
    font-size: 21px;
  }

  .page-faq .faq-item > summary {
    padding: 18px 18px 18px 24px;
    font-size: 17px;
  }

  .page-faq .faq-item__a {
    padding: 0 20px 20px 58px;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-faq .faq-hero {
    padding: 40px 0 48px;
  }

  .page-faq .faq-hero__inner {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    gap: 44px;
  }
}

@media (min-width: 1024px) {
  .page-faq .faq-desk {
    grid-template-columns: 96px minmax(0, 1fr);
    gap: 40px;
    padding-top: 44px;
  }

  .page-faq .faq-rail {
    display: block;
  }

  .page-faq .faq-search {
    padding: 16px 0;
  }
}

@media (min-width: 1280px) {
  .page-faq .faq-hero__inner {
    gap: 64px;
  }

  .page-faq .faq-board__num {
    font-size: 52px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item,
  .page-faq .faq-item::before,
  .page-faq .faq-item__num,
  .page-faq .faq-search__field,
  .page-faq .faq-jump {
    transition: none;
  }
}
</main>