.page-faq {
  --faq-cut: 12px;
}

/* ---------- 面包屑 ---------- */
.page-faq .breadcrumb {
  padding-top: 22px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--muted);
}

.page-faq .breadcrumb a {
  color: var(--muted);
  text-decoration: none;
  transition: color .18s var(--ease);
}

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

.page-faq .breadcrumb span[aria-hidden="true"] {
  margin: 0 6px;
  color: var(--line);
}

/* ---------- 栏目标头 ---------- */
.page-faq .faq-head {
  position: relative;
  overflow: hidden;
  padding: 22px 0 50px;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-head::before {
  content: "";
  position: absolute;
  inset: -30% -12% auto -12%;
  height: 150%;
  background:
    radial-gradient(520px 300px at 84% 10%, var(--violet-wash), transparent 68%),
    radial-gradient(460px 260px at 4% 14%, var(--aurora-wash), transparent 66%);
  pointer-events: none;
  z-index: 0;
}

.page-faq .faq-head__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 30px;
}

.page-faq .faq-head__text {
  max-width: 52ch;
}

.page-faq .faq-head__text .eyebrow {
  margin: 0 0 14px;
}

.page-faq .faq-head h1 {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 28px;
  line-height: 1.28;
  letter-spacing: -0.02em;
  color: var(--text);
}

.page-faq .faq-head__lede {
  margin: 0 0 22px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--muted);
}

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

.page-faq .faq-head__keys li {
  padding: 5px 12px;
  border: 1px solid var(--line);
  background: rgba(26, 34, 51, 0.6);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--muted);
  clip-path: polygon(8px 0, 100% 0, 100% 100%, 0 100%, 0 8px);
}

.page-faq .faq-head__keys li:first-child {
  color: var(--text);
  border-color: rgba(53, 224, 208, 0.34);
}

.page-faq .faq-head__art {
  width: min(240px, 68%);
  margin: 0 auto;
  clip-path: polygon(58px 0, 100% 0, 100% calc(100% - 58px), calc(100% - 58px) 100%, 0 100%, 0 58px);
  background: var(--nebula);
}

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

/* ---------- 主体布局 ---------- */
.page-faq .faq-index {
  padding: 40px 0 56px;
  background: var(--ink);
}

.page-faq .faq-layout {
  display: grid;
  gap: 36px;
}

/* ---------- 侧栏 ---------- */
.page-faq .faq-side__sticky {
  display: grid;
  gap: 18px;
}

.page-faq .faq-side .toc-title {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--aurora);
}

.page-faq .faq-side .toc-title::before {
  content: "—— ";
  color: var(--line);
}

.page-faq .faq-filter {
  display: grid;
  gap: 8px;
}

.page-faq .faq-filter__label {
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--muted);
}

.page-faq .faq-filter .filter-input {
  width: 100%;
  padding: 10px 12px;
  background: var(--stone);
  border: 1px solid var(--line);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 14px;
  clip-path: polygon(10px 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%, 0 10px);
  transition: border-color .18s var(--ease);
}

.page-faq .faq-filter .filter-input::placeholder {
  color: rgba(154, 167, 188, 0.7);
}

.page-faq .faq-filter .filter-input:focus {
  outline: none;
  border-color: var(--aurora);
}

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

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

.page-faq .faq-toc .toc-link {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 10px;
  padding: 12px 10px;
  text-decoration: none;
  font-size: 14px;
  color: var(--muted);
  transition: color .18s var(--ease), background .18s var(--ease);
}

.page-faq .faq-toc .toc-link:hover,
.page-faq .faq-toc .toc-link:focus-visible,
.page-faq .faq-toc .toc-link.is-active {
  color: var(--text);
  background: var(--aurora-wash);
}

.page-faq .faq-toc__no {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--aurora);
  opacity: .72;
}

.page-faq .faq-toc__count {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--muted);
}

.page-faq .faq-side__note {
  margin: 4px 0 0;
  font-size: 12.5px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 分组 ---------- */
.page-faq .faq-main {
  display: grid;
  gap: 48px;
}

.page-faq .faq-group {
  scroll-margin-top: 96px;
}

.page-faq .faq-group__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  column-gap: 16px;
  row-gap: 6px;
  padding-bottom: 16px;
  margin-bottom: 22px;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-group__no {
  grid-row: 1 / span 2;
  align-self: start;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 34px;
  line-height: 1;
  color: var(--aurora);
  opacity: .3;
}

.page-faq .faq-group__head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 21px;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-faq .faq-group__head p {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

.page-faq .faq-list {
  display: grid;
  gap: 12px;
}

/* ---------- 问答条目 ---------- */
.page-faq .qa {
  background: var(--stone);
  border: 1px solid var(--line);
  clip-path: polygon(var(--faq-cut) 0, 100% 0, 100% calc(100% - var(--faq-cut)), calc(100% - var(--faq-cut)) 100%, 0 100%, 0 var(--faq-cut));
  transition: border-color .2s var(--ease);
}

.page-faq .qa[open] {
  border-color: rgba(53, 224, 208, 0.42);
}

.page-faq .qa__summary {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
  font-size: 15px;
  line-height: 1.62;
  color: var(--text);
}

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

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

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

.page-faq .qa__no {
  flex: none;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.9;
  color: var(--aurora);
  opacity: .78;
}

.page-faq .qa__q {
  flex: 1 1 auto;
  font-weight: 600;
}

.page-faq .qa__summary::after {
  content: "+";
  flex: none;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1.35;
  color: var(--muted);
  transition: color .18s var(--ease);
}

.page-faq .qa[open] .qa__summary::after {
  content: "−";
  color: var(--aurora);
}

.page-faq .qa__body {
  display: grid;
  gap: 14px;
  margin: 0 18px 20px;
  padding-top: 16px;
  border-top: 1px dashed var(--line);
}

.page-faq .qa__cond {
  margin: 0;
  padding: 11px 14px;
  background: rgba(238, 242, 247, 0.05);
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--text);
}

.page-faq .qa__act {
  margin: 0;
  padding: 2px 0 2px 14px;
  border-left: 2px solid var(--aurora);
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--text);
}

.page-faq .qa__edge {
  margin: 0;
  padding-left: 14px;
  font-size: 13px;
  line-height: 1.78;
  color: var(--muted);
}

.page-faq .qa__tag {
  display: inline-block;
  margin-right: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--muted);
}

.page-faq .qa__act .qa__tag {
  color: var(--aurora);
}

/* ---------- 组内配图 ---------- */
.page-faq .faq-figure {
  margin: 2px 0 0;
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line);
  clip-path: polygon(16px 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%, 0 16px);
}

.page-faq .faq-figure figcaption {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.72;
  color: var(--muted);
}

/* ---------- 联络路径 ---------- */
.page-faq .faq-contact {
  padding: 54px 0 64px;
  background: var(--nebula);
  border-top: 1px solid var(--line);
}

.page-faq .faq-contact h2 {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 22px;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-faq .faq-contact__lede {
  margin: 0 0 28px;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

.page-faq .faq-contact__grid {
  display: grid;
  gap: 14px;
  margin-bottom: 30px;
}

.page-faq .faq-contact__col {
  padding: 20px 18px;
  background: var(--stone);
  border: 1px solid var(--line);
  border-left-width: 2px;
  clip-path: polygon(12px 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%, 0 12px);
}

.page-faq .faq-contact__col--self {
  border-left-color: var(--aurora);
}

.page-faq .faq-contact__col--mail {
  border-left-color: var(--violet);
}

.page-faq .faq-contact__col--alert {
  border-left-color: var(--alert);
}

.page-faq .faq-contact__col h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 16px;
  color: var(--text);
}

.page-faq .faq-contact__col p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.page-faq .faq-contact__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-faq .faq-contact__actions .btn {
  text-decoration: none;
}

/* ---------- 返回顶部 ---------- */
.page-faq .to-top {
  position: fixed;
  right: 16px;
  bottom: 20px;
  z-index: 30;
  padding: 10px 16px;
  border: 1px solid rgba(53, 224, 208, 0.42);
  background: rgba(13, 20, 36, 0.92);
  color: var(--aurora);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transition: opacity .2s var(--ease);
  clip-path: polygon(10px 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%, 0 10px);
}

.page-faq .to-top.is-visible {
  opacity: 1;
  pointer-events: auto;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-faq .faq-head {
    padding: 30px 0 60px;
  }

  .page-faq .faq-head__inner {
    grid-template-columns: minmax(0, 1fr) 260px;
    align-items: center;
    gap: 40px;
  }

  .page-faq .faq-head h1 {
    font-size: 36px;
  }

  .page-faq .faq-head__art {
    width: 100%;
    margin: 0;
  }

  .page-faq .faq-contact__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }

  .page-faq .qa__summary {
    padding: 18px 22px;
    font-size: 15.5px;
  }

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

  .page-faq .to-top {
    right: 28px;
    bottom: 28px;
  }
}

@media (min-width: 980px) {
  .page-faq .faq-layout {
    grid-template-columns: 286px minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }

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

  .page-faq .faq-head h1 {
    font-size: 44px;
  }

  .page-faq .faq-group__head h2 {
    font-size: 22px;
  }

  .page-faq .faq-contact {
    padding: 68px 0 80px;
  }

  .page-faq .faq-contact h2 {
    font-size: 26px;
  }
}

@media (min-width: 1120px) {
  .page-faq .faq-head__inner {
    grid-template-columns: minmax(0, 1fr) 300px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa,
  .page-faq .qa__summary::after,
  .page-faq .faq-toc .toc-link,
  .page-faq .to-top {
    transition: none;
  }
}