.page-faq {
  --faq-col: 68ch;
  --faq-pad: 20px;
  padding-bottom: 84px;
}

/* ---------- 面包屑与首屏 ---------- */
.page-faq .breadcrumb {
  margin-top: 18px;
  font-size: 12px;
}

.page-faq .faq-hero {
  padding-top: 26px;
  padding-bottom: 34px;
}

.page-faq .faq-hero__kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--c-teal);
}

.page-faq h1 {
  margin: 14px 0 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(36px, 8.4vw, 76px);
  line-height: 1.04;
  letter-spacing: -0.02em;
  color: var(--c-mist);
}

.page-faq .faq-hero__lede {
  max-width: var(--faq-col);
  margin: 18px 0 0;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.78;
  color: var(--c-mist);
}

.page-faq .faq-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 30px;
  margin: 28px 0 0;
  padding: 16px 0 0;
  border-top: 1px solid var(--c-rule);
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .05em;
  color: var(--c-grey);
}

.page-faq .faq-hero__num {
  margin-right: 6px;
  font-size: 20px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--c-coral);
}

/* ---------- 吸顶分类入口 ---------- */
.page-faq .faq-cats {
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--c-deep);
  border-top: 1px solid var(--c-rule);
  border-bottom: 1px solid var(--c-rule);
}

.page-faq .faq-cats__inner {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 12px var(--faq-pad);
}

.page-faq .faq-cat {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  grid-template-areas:
    "code name"
    "code range";
  column-gap: 10px;
  align-items: center;
  padding: 9px 11px;
  border: 2px solid var(--c-rule);
  background: var(--c-abyss);
  text-decoration: none;
  transition: border-color .18s ease, background-color .18s ease;
}

.page-faq .faq-cat__code {
  grid-area: code;
  font-family: var(--font-mono);
  font-size: 17px;
  font-weight: 700;
  color: var(--c-cyan);
}

.page-faq .faq-cat__name {
  grid-area: name;
  font-family: var(--font-head);
  font-size: 14px;
  font-weight: 900;
  line-height: 1.3;
  color: var(--c-mist);
}

.page-faq .faq-cat__range {
  grid-area: range;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .07em;
  color: var(--c-grey);
}

.page-faq .faq-cat:hover,
.page-faq .faq-cat:focus-visible {
  border-color: var(--c-cyan);
  background: var(--c-panel);
  outline: none;
}

.page-faq .faq-cat:active {
  background: var(--c-teal);
  border-color: var(--c-cyan);
}

/* ---------- 横幅图 ---------- */
.page-faq .faq-banner {
  max-width: 1560px;
  margin: 26px auto 0;
  padding: 0 var(--faq-pad);
}

/* ---------- 图版通用 ---------- */
.page-faq .qa-block {
  max-width: 760px;
  margin: 0 auto;
  padding: 48px var(--faq-pad) 0;
  scroll-margin-top: 128px;
}

.page-faq .qa-block__head {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-top: 16px;
  border-top: 1px solid var(--c-rule);
}

.page-faq .qa-block__head::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 76px;
  height: 1px;
  background: var(--c-cyan);
}

.page-faq .qa-block__idx {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--c-teal);
}

.page-faq .qa-block__head h2 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(24px, 4.6vw, 34px);
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--c-mist);
}

.page-faq .qa-block__lede {
  max-width: var(--faq-col);
  margin: 12px 0 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--c-grey);
}

.page-faq .qa-block__aside {
  max-width: 420px;
  margin-top: 28px;
}

/* ---------- 问答列表 ---------- */
.page-faq .qa-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 22px;
}

.page-faq .qa {
  background: var(--c-panel);
  border-left: 2px solid var(--c-rule);
  transition: border-left-color .2s ease;
}

.page-faq .qa:hover {
  border-left-color: var(--c-teal);
}

.page-faq .qa[open] {
  border-left-color: var(--c-cyan);
}

.page-faq .qa__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) 16px;
  gap: 14px;
  align-items: start;
  padding: 16px 16px 16px 18px;
  cursor: pointer;
  list-style: none;
}

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

.page-faq .qa__head:focus-visible {
  outline: 1px solid var(--c-cyan);
  outline-offset: 2px;
}

.page-faq .qa__code {
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .05em;
  color: var(--c-cyan);
}

.page-faq .qa__q {
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 900;
  line-height: 1.5;
  letter-spacing: -0.01em;
  color: var(--c-mist);
}

.page-faq .qa__mark {
  position: relative;
  width: 14px;
  height: 14px;
  margin-top: 5px;
  border: 1px solid var(--c-teal);
}

.page-faq .qa__mark::before,
.page-faq .qa__mark::after {
  content: "";
  position: absolute;
  background: var(--c-teal);
  transition: transform .2s ease, opacity .2s ease;
}

.page-faq .qa__mark::before {
  left: 3px;
  right: 3px;
  top: 50%;
  height: 1px;
  transform: translateY(-50%);
}

.page-faq .qa__mark::after {
  top: 3px;
  bottom: 3px;
  left: 50%;
  width: 1px;
  transform: translateX(-50%);
}

.page-faq .qa[open] .qa__mark {
  border-color: var(--c-cyan);
}

.page-faq .qa[open] .qa__mark::before,
.page-faq .qa[open] .qa__mark::after {
  background: var(--c-cyan);
}

.page-faq .qa[open] .qa__mark::after {
  transform: translateX(-50%) scaleY(0);
  opacity: 0;
}

.page-faq .qa__body {
  padding: 2px 18px 20px;
  border-top: 1px dashed var(--c-rule);
}

.page-faq .qa__body p {
  max-width: var(--faq-col);
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-mist);
}

.page-faq .qa__body a {
  color: var(--c-cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.page-faq .qa__body p.qa__note {
  padding-left: 12px;
  border-left: 1px solid var(--c-rule);
  font-size: 12.5px;
  line-height: 1.68;
  color: var(--c-grey);
}

.page-faq .qa__body p.qa__note a {
  color: var(--c-grey);
}

.page-faq .faq-field {
  display: inline-block;
  padding: 1px 6px;
  font-family: var(--font-mono);
  font-size: .88em;
  font-variant-numeric: tabular-nums;
  color: var(--c-cyan);
  background: rgba(41, 224, 214, .09);
  border: 1px solid rgba(41, 224, 214, .3);
}

/* ---------- 反馈步骤 ---------- */
.page-faq .faq-steps {
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
  counter-reset: faqstep;
}

.page-faq .faq-steps li {
  position: relative;
  counter-increment: faqstep;
  padding: 14px 0 14px 48px;
  border-top: 1px solid var(--c-rule);
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--c-mist);
}

.page-faq .faq-steps li:last-child {
  border-bottom: 1px solid var(--c-rule);
}

.page-faq .faq-steps li::before {
  content: counter(faqstep, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--c-teal);
}

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

.page-faq .faq-footnote {
  max-width: var(--faq-col);
  margin: 30px 0 0;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--c-grey);
}

/* ---------- 中屏 ---------- */
@media (min-width: 720px) {
  .page-faq {
    --faq-pad: 32px;
  }

  .page-faq .faq-cats__inner {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 10px;
    padding: 14px var(--faq-pad);
  }

  .page-faq .faq-cat {
    padding: 11px 13px;
  }

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

  .page-faq .qa__body {
    padding: 4px 22px 22px 22px;
  }

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

/* ---------- 宽屏：宽窄图版交替 ---------- */
@media (min-width: 1024px) {
  .page-faq .qa-block {
    max-width: 820px;
  }

  .page-faq .qa-block--split {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 328px;
    gap: 52px;
    align-items: start;
    max-width: 1180px;
  }

  .page-faq .qa-block__aside {
    max-width: none;
    margin-top: 44px;
  }

  .page-faq .faq-steps {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 40px;
  }

  .page-faq .faq-steps li {
    padding-right: 8px;
  }

  .page-faq .faq-steps li:nth-child(2) {
    border-top: 1px solid var(--c-rule);
  }

  .page-faq .faq-steps li:nth-last-child(-n + 2) {
    border-bottom: 1px solid var(--c-rule);
  }
}