.page-faq {
  --faq-rail: 236px;
  --faq-line: rgba(122, 84, 16, 0.20);
  --faq-line-strong: rgba(122, 84, 16, 0.44);
  --faq-body: #34383F;
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  background: var(--ink);
  color: var(--champagne);
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--line-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-soft) 1px, transparent 1px);
  background-size: 72px 72px;
  opacity: 0.5;
  pointer-events: none;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: var(--tier-1);
  opacity: 0.85;
}

.page-faq .faq-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 36px;
  padding-top: 42px;
  padding-bottom: 50px;
}

.page-faq .faq-hero__text .breadcrumb {
  color: rgba(244, 238, 226, 0.6);
}

.page-faq .faq-hero__text .breadcrumb a {
  color: rgba(244, 238, 226, 0.82);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-faq .faq-hero__text .breadcrumb a:hover {
  color: var(--gold-bright);
  border-color: var(--gold-bright);
}

.page-faq .faq-hero h1 {
  margin: 16px 0 0;
  font-size: clamp(34px, 7vw, 74px);
  line-height: 1.06;
  letter-spacing: -0.03em;
  font-weight: 900;
  color: var(--ivory);
}

.page-faq .faq-hero__lede {
  margin: 20px 0 0;
  max-width: 48ch;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(244, 238, 226, 0.78);
}

.page-faq .faq-hero__actions {
  margin-top: 30px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 图片容器 ---------- */

.page-faq .faq-figure {
  position: relative;
  margin: 0;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: var(--ink-2);
  overflow: hidden;
}

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

.page-faq .faq-figure__cap {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 26px 14px 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: rgba(244, 238, 226, 0.85);
  background: linear-gradient(to top, rgba(11, 11, 13, 0.92), transparent);
}

/* ---------- 主体骨架 ---------- */

.page-faq .faq-body {
  background: var(--champagne);
  color: var(--ink);
  padding: 46px 0 62px;
}

.page-faq .faq-body__inner {
  display: grid;
  gap: 32px;
}

/* ---------- 左侧分类索引 ---------- */

.page-faq .faq-rail {
  border-top: 2px solid var(--gold);
  padding-top: 14px;
}

.page-faq .faq-rail__label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--gold-ink);
}

.page-faq .faq-rail__nav {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 8px;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.page-faq .faq-rail__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  flex: none;
  padding: 9px 13px;
  border: 1px solid var(--faq-line-strong);
  border-radius: 2px;
  font-size: 14px;
  line-height: 1.4;
  white-space: nowrap;
  text-decoration: none;
  color: var(--gold-ink);
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.page-faq .faq-rail__link:hover {
  color: var(--ink);
  border-color: var(--gold);
  background: rgba(200, 145, 42, 0.08);
}

.page-faq .faq-rail__no {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--graphite);
}

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

.page-faq .faq-rail__aside-label {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--graphite);
}

.page-faq .faq-rail__aside a {
  display: inline-block;
  padding-bottom: 3px;
  font-size: 14px;
  text-decoration: none;
  color: var(--gold-ink);
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-faq .faq-rail__aside a:hover {
  color: var(--ink);
  border-color: var(--gold);
}

/* ---------- 筛选 ---------- */

.page-faq .faq-filter {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 38px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--faq-line);
}

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

.page-faq .faq-filter__btn {
  display: inline-flex;
  align-items: center;
  padding: 8px 16px;
  border: 1px solid var(--faq-line-strong);
  border-radius: 2px;
  background: transparent;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--gold-ink);
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.page-faq .faq-filter__btn:hover {
  border-color: var(--gold);
  color: var(--ink);
}

.page-faq .faq-filter__radio:checked + .faq-filter__btn {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--gold-bright);
}

.page-faq .faq-filter__radio:focus-visible + .faq-filter__btn {
  outline: 2px solid var(--gold-bright);
  outline-offset: 3px;
}

.page-faq:has(#faq-scope-install:checked) .faq-group:not([data-cat="install"]):not([data-cat="help"]),
.page-faq:has(#faq-scope-plan:checked) .faq-group:not([data-cat="plan"]):not([data-cat="help"]),
.page-faq:has(#faq-scope-price:checked) .faq-group:not([data-cat="price"]):not([data-cat="help"]),
.page-faq:has(#faq-scope-warranty:checked) .faq-group:not([data-cat="warranty"]):not([data-cat="help"]) {
  display: none;
}

/* ---------- 分组 ---------- */

.page-faq .faq-group {
  position: relative;
  margin-bottom: 54px;
  padding-top: 24px;
  scroll-margin-top: 92px;
}

.page-faq .faq-group::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 7px;
  border-top: 1px solid var(--faq-line-strong);
  background-image: repeating-linear-gradient(
    90deg,
    var(--faq-line-strong) 0 1px,
    transparent 1px 16px
  );
  background-size: 100% 6px;
  background-repeat: no-repeat;
  background-position: 0 0;
}

.page-faq .faq-group__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 14px;
  margin-bottom: 20px;
}

.page-faq .faq-group__no {
  padding: 2px 8px;
  border: 1px solid var(--faq-line-strong);
  border-radius: 2px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--gold-ink);
}

.page-faq .faq-group__title {
  margin: 0;
  font-size: clamp(22px, 3vw, 32px);
  line-height: 1.2;
  letter-spacing: -0.02em;
  font-weight: 800;
  color: var(--ink);
}

.page-faq .faq-group__lede {
  flex-basis: 100%;
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--graphite);
}

.page-faq .faq-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

/* ---------- 问答条目 ---------- */

.page-faq .faq-item {
  border: 1px solid var(--faq-line);
  border-radius: 2px;
  background: var(--ivory);
  transition: border-color 0.2s ease;
}

.page-faq .faq-item:hover,
.page-faq .faq-item[open] {
  border-color: var(--gold);
}

.page-faq .faq-item__q {
  position: relative;
  display: block;
  padding: 16px 52px 16px 18px;
  cursor: pointer;
  list-style: none;
  font-size: clamp(16px, 1.9vw, 20px);
  line-height: 1.5;
  letter-spacing: -0.01em;
  font-weight: 700;
  color: var(--ink);
}

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

.page-faq .faq-item__q::marker {
  content: "";
}

.page-faq .faq-item__q::after {
  content: "+";
  position: absolute;
  top: 16px;
  right: 18px;
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 400;
  color: var(--gold);
  transition: color 0.2s ease;
}

.page-faq .faq-item[open] .faq-item__q::after {
  content: "–";
  color: var(--gold-ink);
}

.page-faq .faq-item__q:hover::after {
  color: var(--gold-ink);
}

.page-faq .faq-item__no {
  display: inline-block;
  margin-right: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.1em;
  color: var(--gold-ink);
}

.page-faq .faq-item__a {
  margin: 0 18px 18px;
  padding-top: 14px;
  border-top: 1px solid var(--faq-line);
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--faq-body);
}

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

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

/* ---------- 质保刻度图 ---------- */

.page-faq .faq-figure--timeline {
  margin-top: 22px;
  border-color: var(--faq-line-strong);
}

/* ---------- 结尾入口 ---------- */

.page-faq .faq-group--help {
  margin-bottom: 0;
  padding: 26px 22px 28px;
  border: 1px solid var(--gold);
  border-radius: 2px;
  background: var(--ink);
  color: var(--champagne);
}

.page-faq .faq-group--help::before {
  display: none;
}

.page-faq .faq-group--help .faq-group__no {
  color: var(--gold-bright);
  border-color: rgba(200, 145, 42, 0.6);
}

.page-faq .faq-group--help .faq-group__title {
  color: var(--ivory);
}

.page-faq .faq-group--help .faq-group__lede {
  color: rgba(244, 238, 226, 0.72);
}

.page-faq .faq-help__text {
  margin: 0;
  max-width: 60ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: rgba(244, 238, 226, 0.82);
}

.page-faq .faq-help__actions {
  margin-top: 22px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 断点 ---------- */

@media (min-width: 900px) {
  .page-faq .faq-hero__inner {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    gap: 56px;
    align-items: center;
    padding-top: 84px;
    padding-bottom: 88px;
  }

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

  .page-faq .faq-body {
    padding: 86px 0 104px;
  }

  .page-faq .faq-body__inner {
    grid-template-columns: var(--faq-rail) minmax(0, 1fr);
    gap: 64px;
    align-items: start;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: 96px;
  }

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

  .page-faq .faq-rail__link {
    display: flex;
    padding: 11px 0;
    border: 0;
    border-bottom: 1px solid var(--faq-line);
    border-radius: 0;
    white-space: normal;
  }

  .page-faq .faq-rail__link:hover {
    background: transparent;
    padding-left: 6px;
  }

  .page-faq .faq-rail__aside {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-top: 26px;
    padding-top: 14px;
    border-top: 1px solid var(--faq-line);
  }

  .page-faq .faq-group {
    margin-bottom: 66px;
  }

  .page-faq .faq-item__q {
    padding: 18px 56px 18px 22px;
  }

  .page-faq .faq-item__q::after {
    top: 18px;
    right: 22px;
  }

  .page-faq .faq-item__a {
    margin: 0 22px 20px;
    font-size: 16px;
  }

  .page-faq .faq-group--help {
    padding: 34px 36px 36px;
  }
}

@media (min-width: 1200px) {
  .page-faq .faq-hero__inner {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 72px;
  }

  .page-faq .faq-body__inner {
    gap: 76px;
  }
}