.page-faq {
  background: var(--ink);
  color: var(--white);
  font-family: var(--f-body);
}

.page-faq .breadcrumb {
  margin-top: 24px;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(28px, 5vw, 56px) 0 clamp(36px, 6vw, 72px);
  border-bottom: 1px solid var(--line);
  background-color: var(--stand);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  top: -25%;
  right: -12%;
  width: 74%;
  height: 165%;
  background: linear-gradient(155deg, var(--turf) 0%, var(--ink) 82%);
  clip-path: polygon(42% 0, 100% 0, 100% 100%, 0 100%);
  opacity: 0.9;
  pointer-events: none;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(90deg, var(--line) 0 1px, transparent 1px 78px);
  opacity: 0.5;
  pointer-events: none;
}

.page-faq .faq-hero__in {
  position: relative;
  z-index: 1;
}

.page-faq .faq-hero h1 {
  margin: 14px 0 0;
  font-family: var(--f-display);
  font-weight: 900;
  font-size: clamp(2rem, 5.4vw, 3.4rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
  max-width: 17ch;
}

.page-faq .faq-hero__lede {
  margin: 18px 0 0;
  max-width: 34rem;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--grey);
}

.page-faq .faq-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 0;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-hero__meta li {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 0 18px;
  border-left: 1px solid var(--line);
}

.page-faq .faq-hero__meta li:first-child {
  padding-left: 0;
  border-left: 0;
}

.page-faq .faq-hero__meta strong {
  font-family: var(--f-mono);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--acid);
  line-height: 1;
}

.page-faq .faq-hero__meta span {
  font-size: 0.8125rem;
  color: var(--steel);
}

/* ---------- 主结构 ---------- */
.page-faq .faq-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
  padding-top: 32px;
  padding-bottom: 72px;
}

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

.page-faq .faq-rail__title {
  margin: 0 0 12px;
  font-family: var(--f-mono);
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  color: var(--steel);
}

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

.page-faq .faq-rail__link {
  display: flex;
  align-items: baseline;
  gap: 9px;
  padding: 10px 14px;
  border: 1px solid var(--line);
  color: var(--grey);
  text-decoration: none;
  white-space: nowrap;
  font-size: 0.875rem;
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease), background-color var(--t-fast) var(--ease);
}

.page-faq .faq-rail__link:hover {
  color: var(--white);
  border-color: var(--turf);
  background: rgba(20, 92, 58, 0.28);
}

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

.page-faq .faq-rail__num {
  font-family: var(--f-mono);
  font-size: 0.75rem;
  color: var(--acid);
}

.page-faq .faq-rail__frame {
  display: none;
  position: relative;
  margin-top: 20px;
  border: 1px solid var(--line);
  overflow: hidden;
}

.page-faq .faq-rail__frame img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.6;
}

/* ---------- 搜索条 ---------- */
.page-faq .faq-search {
  display: grid;
  gap: 12px;
  padding: 18px;
  border: 1px solid var(--line);
  background: var(--stand);
}

.page-faq .faq-search label {
  font-family: var(--f-mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  color: var(--steel);
}

.page-faq .faq-search input {
  width: 100%;
  box-sizing: border-box;
  padding: 12px 14px;
  border: 1px solid var(--line);
  background: var(--ink);
  color: var(--white);
  font-family: var(--f-body);
  font-size: 1rem;
}

.page-faq .faq-search input::placeholder {
  color: var(--steel);
}

.page-faq .faq-search input:focus-visible {
  outline: 2px solid var(--acid);
  outline-offset: 2px;
  border-color: var(--acid);
}

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

.page-faq .faq-search__chips a {
  padding: 5px 10px;
  border: 1px solid var(--line);
  font-family: var(--f-mono);
  font-size: 0.8125rem;
  color: var(--grey);
  text-decoration: none;
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}

.page-faq .faq-search__chips a:hover {
  color: var(--acid-soft);
  border-color: var(--acid);
}

.page-faq .faq-search__chips a:focus-visible {
  outline: 2px solid var(--acid);
  outline-offset: 2px;
}

/* ---------- 分类与问答 ---------- */
.page-faq .faq-group {
  scroll-margin-top: 84px;
  margin-top: 44px;
}

.page-faq .faq-group__head {
  display: flex;
  align-items: baseline;
  gap: 16px;
  margin-bottom: 4px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-group__head .sec-num {
  flex: none;
  font-family: var(--f-mono);
  color: var(--acid);
  font-size: 1.5rem;
  line-height: 1;
}

.page-faq .faq-group__head h2 {
  margin: 0;
  font-family: var(--f-display);
  font-weight: 900;
  font-size: clamp(1.25rem, 3.4vw, 1.75rem);
  letter-spacing: -0.01em;
}

.page-faq .qa {
  border-bottom: 1px solid var(--line);
  transition: background-color var(--t-fast) var(--ease);
}

.page-faq .qa[open] {
  background: linear-gradient(90deg, rgba(200, 255, 61, 0.06), rgba(200, 255, 61, 0) 62%);
}

.page-faq .qa > summary {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 18px 36px 18px 4px;
  cursor: pointer;
  list-style: none;
}

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

.page-faq .qa > summary::after {
  content: "+";
  position: absolute;
  top: 16px;
  right: 8px;
  font-family: var(--f-mono);
  font-size: 1.15rem;
  line-height: 1;
  color: var(--acid);
  transition: color var(--t-fast) var(--ease);
}

.page-faq .qa[open] > summary::after {
  content: "–";
}

.page-faq .qa > summary:hover {
  background: rgba(20, 92, 58, 0.22);
}

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

.page-faq .qa__idx {
  flex: none;
  padding-top: 3px;
  font-family: var(--f-mono);
  font-size: 0.75rem;
  color: var(--steel);
}

.page-faq .qa[open] .qa__idx {
  color: var(--acid);
}

.page-faq .qa__q {
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.55;
  color: var(--white);
}

.page-faq .qa__a {
  padding: 0 36px 22px 42px;
  font-size: 0.9375rem;
  line-height: 1.9;
  color: var(--grey);
}

.page-faq .qa__a p {
  margin: 0 0 10px;
  max-width: 40em;
}

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

.page-faq .qa__a a {
  color: var(--acid-soft);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-faq .qa__a a:hover {
  color: var(--acid);
}

.page-faq .qa__a a:focus-visible {
  outline: 2px solid var(--acid);
  outline-offset: 2px;
}

/* ---------- 过渡图 ---------- */
.page-faq .faq-break {
  margin: 44px 0 0;
}

.page-faq .faq-break img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--line);
}

.page-faq .faq-break figcaption {
  margin-top: 10px;
  font-family: var(--f-mono);
  font-size: 0.8125rem;
  color: var(--steel);
}

/* ---------- 收尾联系区 ---------- */
.page-faq .faq-contact {
  position: relative;
  margin-top: 52px;
  padding: clamp(22px, 4vw, 40px);
  border: 1px solid var(--line);
  background: var(--stand);
}

.page-faq .faq-contact::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 88px;
  height: 4px;
  background: var(--acid);
}

.page-faq .faq-contact h2 {
  margin: 0;
  font-family: var(--f-display);
  font-weight: 900;
  font-size: clamp(1.35rem, 3.6vw, 1.9rem);
  letter-spacing: -0.01em;
}

.page-faq .faq-contact > p {
  margin: 14px 0 0;
  max-width: 40em;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--grey);
}

.page-faq .faq-contact > p a {
  color: var(--acid-soft);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-faq .faq-contact > p a:focus-visible {
  outline: 2px solid var(--acid);
  outline-offset: 2px;
}

.page-faq .faq-contact__list {
  display: grid;
  gap: 1px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
  border: 1px solid var(--line);
  background: var(--line);
}

.page-faq .faq-contact__list li {
  display: grid;
  gap: 4px;
  padding: 12px 16px;
  background: var(--ink);
}

.page-faq .faq-contact__k {
  font-family: var(--f-mono);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--steel);
}

.page-faq .faq-contact__v {
  font-family: var(--f-mono);
  font-size: 0.875rem;
  color: var(--white);
  word-break: break-word;
}

.page-faq .faq-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-faq .faq-hero h1 {
    max-width: 20ch;
  }
}

@media (min-width: 960px) {
  .page-faq .faq-shell {
    grid-template-columns: 264px minmax(0, 1fr);
    gap: 56px;
    padding-top: 56px;
    padding-bottom: 120px;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: 84px;
    align-self: start;
  }

  .page-faq .faq-rail__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
    border-top: 1px solid var(--line);
  }

  .page-faq .faq-rail__link {
    border: 0;
    border-left: 2px solid transparent;
    border-bottom: 1px solid var(--line);
    padding: 13px 0 13px 14px;
    white-space: normal;
    font-size: 0.9375rem;
  }

  .page-faq .faq-rail__link:hover {
    border-left-color: var(--acid);
    background: transparent;
    color: var(--white);
  }

  .page-faq .faq-rail__frame {
    display: block;
    aspect-ratio: 7 / 9;
  }

  .page-faq .faq-search {
    grid-template-columns: 1fr;
    padding: 22px;
  }

  .page-faq .qa > summary {
    padding: 22px 44px 22px 4px;
  }

  .page-faq .qa__q {
    font-size: 1.0625rem;
  }

  .page-faq .qa__a {
    padding: 0 44px 26px 42px;
  }

  .page-faq .faq-break {
    margin-top: 56px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq * {
    transition: none !important;
  }
}