.page-faq {
  --faq-index-w: 216px;
  --faq-offset: calc(var(--topbar-h) + 24px);
  padding-bottom: clamp(48px, 8vw, 110px);
}

/* ---------- 面包屑 ---------- */
.page-faq .breadcrumb {
  margin-top: clamp(20px, 3vw, 34px);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding-block: clamp(26px, 5vw, 54px) clamp(24px, 4vw, 42px);
  border-bottom: var(--hair);
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: clamp(64px, 12vw, 140px);
  height: 2px;
  background: var(--grad-pixel);
}

.page-faq .faq-hero h1 {
  margin: 0 0 clamp(16px, 2.4vw, 26px);
  max-width: 13em;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--fs-h1);
  line-height: 1.06;
  letter-spacing: -0.015em;
  color: var(--paper);
}

.page-faq .faq-lead {
  margin: 0;
  max-width: var(--measure);
  font-size: var(--fs-body);
  line-height: 1.8;
  color: var(--mist);
}

.page-faq .faq-quick {
  list-style: none;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-faq .faq-quick li {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.06em;
  color: var(--amber);
  background: var(--panel);
  border: 1px solid var(--line);
  padding: 7px 11px;
}

/* ---------- 图片 ---------- */
.page-faq .faq-figure {
  margin: clamp(26px, 4vw, 42px) 0 0;
}

.page-faq .faq-figure .media-frame {
  max-width: 100%;
}

.page-faq .faq-caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.04em;
  color: var(--mist);
}

.page-faq .faq-figure--inset {
  margin: 0 0 clamp(16px, 2vw, 22px);
}

.page-faq .faq-figure--inset .media-frame {
  max-width: 100%;
}

/* ---------- 主体骨架 ---------- */
.page-faq .faq-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 44px);
  padding-block: clamp(30px, 5vw, 62px) 0;
}

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

.page-faq .faq-index-title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.16em;
  color: var(--mist);
}

.page-faq .faq-index-list {
  list-style: none;
  margin: 0;
  padding: 0 0 4px;
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: max-content;
  gap: 6px;
  overflow-x: auto;
  overscroll-behavior-x: contain;
  scrollbar-width: none;
}

.page-faq .faq-index-list::-webkit-scrollbar {
  display: none;
}

.page-faq .faq-index-link {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 10px 13px;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--mist);
  font-size: var(--fs-sm);
  line-height: 1.4;
  white-space: nowrap;
  text-decoration: none;
  transition: color 160ms var(--ease), border-color 160ms var(--ease), background 160ms var(--ease);
}

.page-faq .faq-index-link:hover,
.page-faq .faq-index-link:focus-visible {
  color: var(--paper);
  border-color: var(--cyan);
  background: var(--panel-2);
}

.page-faq .faq-index-num {
  flex: none;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.08em;
  color: var(--magenta);
}

/* ---------- 分组 ---------- */
.page-faq .faq-body {
  min-width: 0;
}

.page-faq .faq-group {
  scroll-margin-top: var(--faq-offset);
  padding-top: clamp(22px, 3.4vw, 38px);
  margin-top: clamp(26px, 4vw, 46px);
  border-top: var(--hair);
}

.page-faq .faq-group:first-child {
  margin-top: 0;
  padding-top: 0;
  border-top: 0;
}

.page-faq .faq-group-head {
  display: flex;
  align-items: baseline;
  gap: 13px;
  margin-bottom: clamp(14px, 2vw, 20px);
}

.page-faq .faq-group-code {
  flex: none;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.16em;
  color: var(--magenta);
}

.page-faq .faq-group-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--fs-h3);
  line-height: 1.22;
  letter-spacing: -0.01em;
  color: var(--paper);
}

/* ---------- 问答条目 ---------- */
.page-faq .faq-item {
  position: relative;
  border: 1px solid var(--line);
  background: var(--panel);
  transition: border-color 180ms var(--ease);
}

.page-faq .faq-item + .faq-item {
  margin-top: 4px;
}

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

.page-faq .faq-item[open]::before,
.page-faq .faq-item[open]::after {
  content: "";
  position: absolute;
  width: 10px;
  height: 10px;
  pointer-events: none;
}

.page-faq .faq-item[open]::before {
  top: -1px;
  left: -1px;
  border-top: 2px solid var(--cyan);
  border-left: 2px solid var(--cyan);
}

.page-faq .faq-item[open]::after {
  right: -1px;
  bottom: -1px;
  border-right: 2px solid var(--cyan);
  border-bottom: 2px solid var(--cyan);
}

.page-faq .faq-q {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
  color: var(--paper);
  font-size: var(--fs-sm);
  font-weight: 600;
  line-height: 1.62;
  transition: color 160ms var(--ease);
}

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

.page-faq .faq-q::before {
  content: "";
  flex: none;
  width: 8px;
  height: 8px;
  margin-top: 7px;
  background: var(--magenta);
  transform: rotate(45deg);
  transition: background 180ms var(--ease);
}

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

.page-faq .faq-q::after {
  content: "+";
  flex: none;
  margin-left: auto;
  padding-left: 8px;
  font-family: var(--font-mono);
  font-size: var(--fs-body);
  line-height: 1.4;
  color: var(--mist);
  transition: color 180ms var(--ease);
}

.page-faq .faq-item[open] .faq-q::after {
  content: "\2212";
  color: var(--cyan);
}

/* ---------- 答案 ---------- */
.page-faq .faq-a {
  max-width: 46em;
  padding: 0 16px 18px 36px;
  color: var(--mist);
  font-size: var(--fs-sm);
  line-height: 1.8;
}

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

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

.page-faq .faq-callout {
  margin: 0 0 12px;
  padding: 7px 0 7px 12px;
  border-left: 2px solid var(--amber);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  line-height: 1.72;
  letter-spacing: 0.03em;
  color: var(--amber);
}

.page-faq .faq-steps {
  counter-reset: faqstep;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-faq .faq-steps li {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.page-faq .faq-steps li::before {
  counter-increment: faqstep;
  content: counter(faqstep, decimal-leading-zero);
  flex: none;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.08em;
  color: var(--cyan);
}

/* ---------- 联络点 ---------- */
.page-faq .faq-contact {
  position: relative;
  padding: clamp(22px, 3.4vw, 38px);
  border: 1px solid var(--line);
  background: var(--panel-2);
}

.page-faq .faq-contact::before {
  content: "";
  position: absolute;
  top: -1px;
  left: -1px;
  right: -1px;
  height: 3px;
  background: var(--grad-pixel);
}

.page-faq .faq-contact-lead {
  margin: 0 0 clamp(16px, 2.4vw, 22px);
  max-width: var(--measure);
  color: var(--paper);
  font-size: var(--fs-body);
  line-height: 1.78;
}

.page-faq .faq-contact-list {
  list-style: none;
  margin: 0 0 clamp(18px, 2.6vw, 26px);
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-faq .faq-contact-list li {
  display: grid;
  gap: 4px;
  padding-left: 12px;
  border-left: 1px solid var(--line);
}

.page-faq .faq-contact-key {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.1em;
  color: var(--amber);
}

.page-faq .faq-contact-desc {
  font-size: var(--fs-sm);
  line-height: 1.7;
  color: var(--mist);
}

.page-faq .faq-channels {
  display: grid;
  gap: 8px;
  margin-bottom: clamp(16px, 2.4vw, 22px);
}

.page-faq .faq-channel {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  font-size: var(--fs-xs);
  letter-spacing: 0.06em;
  color: var(--mist);
}

.page-faq .faq-channel strong {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: var(--fs-sm);
  letter-spacing: 0.04em;
  color: var(--cyan);
  border-bottom: 1px dashed var(--line);
  padding-bottom: 2px;
  word-break: break-all;
}

.page-faq .faq-contact-note {
  margin: 0 0 clamp(18px, 2.6vw, 26px);
  max-width: var(--measure);
  font-size: var(--fs-xs);
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-faq .faq-q {
    padding: 16px 18px;
  }

  .page-faq .faq-a {
    padding: 0 18px 20px 38px;
  }

  .page-faq .faq-figure--inset .media-frame {
    max-width: 420px;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-shell {
    grid-template-columns: var(--faq-index-w) minmax(0, 1fr);
    gap: clamp(32px, 5vw, 72px);
  }

  .page-faq .faq-index {
    position: sticky;
    top: var(--faq-offset);
    align-self: start;
  }

  .page-faq .faq-index-list {
    grid-auto-flow: row;
    grid-auto-columns: auto;
    grid-template-columns: minmax(0, 1fr);
    gap: 2px;
    overflow-x: visible;
    padding-bottom: 0;
  }

  .page-faq .faq-index-link {
    border: 0;
    border-left: 2px solid var(--line);
    background: transparent;
    white-space: normal;
  }

  .page-faq .faq-index-link:hover,
  .page-faq .faq-index-link:focus-visible {
    border-left-color: var(--cyan);
    background: var(--panel);
  }

  .page-faq .faq-contact-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }
}

@media (min-width: 1200px) {
  .page-faq {
    --faq-index-w: 248px;
  }

  .page-faq .faq-figure--inset .media-frame {
    max-width: 480px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item,
  .page-faq .faq-q,
  .page-faq .faq-q::before,
  .page-faq .faq-q::after,
  .page-faq .faq-index-link,
  .page-faq .faq-index-num {
    transition: none;
  }
}