.page-faq {
  --faq-idx-w: 272px;
  --faq-gap: clamp(16px, 3vw, 32px);
  background: var(--ink-950);
  color: var(--text-primary);
}

/* ---------- Hero ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(20px, 3vw, 32px) 0 clamp(28px, 5vw, 56px);
  border-bottom: 1px solid var(--line-c);
  background: linear-gradient(180deg, var(--pitch-900) 0%, var(--ink-950) 92%);
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(143, 166, 184, 0.08) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(143, 166, 184, 0.08) 1px, transparent 1px);
  background-size: 88px 88px;
}

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

.page-faq .faq-hero .breadcrumb {
  margin-bottom: clamp(18px, 3vw, 30px);
}

.page-faq .faq-hero__grid {
  display: grid;
  gap: clamp(20px, 4vw, 44px);
}

.page-faq .faq-h1 {
  margin: 6px 0 0;
  letter-spacing: -0.03em;
  line-height: 0.92;
}

.page-faq .faq-hero__meta {
  margin: 14px 0 0;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--steel-400);
}

.page-faq .faq-lede {
  margin: 0 0 18px;
  max-width: 40em;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--text-muted);
}

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

.page-faq .quick-jump a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--line-c);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--steel-400);
  text-decoration: none;
  transition: color 160ms var(--ease), border-color 160ms var(--ease), background 160ms var(--ease);
}

.page-faq .quick-jump a .mono {
  color: var(--ember-500);
}

.page-faq .quick-jump a:hover,
.page-faq .quick-jump a:focus-visible {
  color: var(--text-primary);
  border-color: var(--ember-500);
  background: rgba(255, 77, 28, 0.1);
}

/* ---------- 通用区块头 ---------- */
.page-faq .faq-steps,
.page-faq .faq-manual {
  padding: clamp(32px, 5vw, 64px) 0;
  border-bottom: 1px solid var(--line-c);
}

.page-faq .faq-head {
  display: grid;
  justify-items: start;
  gap: 10px;
  max-width: 780px;
  margin-bottom: clamp(20px, 3vw, 34px);
}

.page-faq .faq-head--manual {
  margin-bottom: clamp(22px, 3.5vw, 36px);
}

.page-faq .faq-h2 {
  margin: 0;
  font-size: clamp(22px, 3vw, 34px);
  font-weight: 800;
  line-height: 1.28;
  letter-spacing: -0.01em;
}

.page-faq .faq-sub {
  margin: 0;
  max-width: 42em;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--text-muted);
}

/* ---------- 三步入口 ---------- */
.page-faq .steps-layout {
  display: grid;
  gap: clamp(22px, 4vw, 40px);
}

.page-faq .steps-diagram {
  display: block;
  width: 100%;
  height: auto;
  margin-bottom: 20px;
  border: 1px solid var(--line-c);
  background: var(--carbon-800);
  padding: 10px;
}

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

.page-faq .step-list li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding: 16px 16px 16px 14px;
  background: var(--pitch-900);
}

.page-faq .step-num {
  display: inline-block;
  padding: 3px 6px;
  background: var(--ember-500);
  color: var(--ink-950);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.06em;
}

.page-faq .step-body strong {
  display: block;
  margin-bottom: 6px;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.5;
}

.page-faq .step-body p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--text-muted);
}

.page-faq .faq-figure {
  margin: 0;
  border: 1px solid var(--line-c);
  background: var(--carbon-800);
}

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

.page-faq .faq-figure figcaption {
  padding: 10px 14px;
  border-top: 1px solid var(--line-c);
  font-size: 11.5px;
  letter-spacing: 0.04em;
  line-height: 1.6;
  color: var(--steel-400);
}

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

/* ---------- 双栏手册 ---------- */
.page-faq .manual-layout {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

.page-faq .faq-index {
  border: 1px solid var(--line-c);
  background: var(--carbon-800);
  padding: 16px 14px;
}

.page-faq .faq-index__title {
  margin: 0 0 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line-c);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--steel-400);
}

.page-faq .faq-index__group {
  padding: 10px 0 12px;
  border-bottom: 1px solid var(--line-c);
}

.page-faq .faq-index__group:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.page-faq .faq-index__head {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 4px 0 6px;
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--text-primary);
  text-decoration: none;
}

.page-faq .faq-index__head:hover,
.page-faq .faq-index__head:focus-visible {
  color: var(--ember-300);
}

.page-faq .faq-index__dot {
  width: 8px;
  height: 8px;
  flex: 0 0 8px;
  background: var(--ember-500);
}

.page-faq .faq-index__dot--steel {
  background: var(--steel-400);
}

.page-faq .faq-index__dot--yellow {
  background: var(--card-yellow);
}

.page-faq .faq-index__list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-index__list a {
  display: block;
  padding: 4px 0 4px 8px;
  border-left: 2px solid transparent;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--steel-400);
  text-decoration: none;
  transition: color 140ms var(--ease), border-color 140ms var(--ease);
}

.page-faq .faq-index__list a:hover,
.page-faq .faq-index__list a:focus-visible {
  color: var(--text-primary);
  border-left-color: var(--ember-500);
}

/* ---------- 问答组 ---------- */
.page-faq .qa-group {
  margin: 0 0 clamp(30px, 4vw, 46px);
  scroll-margin-top: calc(var(--topbar-h, 56px) + 20px);
}

.page-faq .qa-group:last-child {
  margin-bottom: 0;
}

.page-faq .qa-group__head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  padding-bottom: 12px;
  margin-bottom: 4px;
  border-bottom: 2px solid var(--ember-500);
}

.page-faq .qa-group__title {
  margin: 0;
  font-size: clamp(17px, 2vw, 21px);
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: -0.005em;
}

.page-faq .qa {
  border-bottom: 1px solid var(--line-c);
  scroll-margin-top: calc(var(--topbar-h, 56px) + 20px);
}

.page-faq .qa summary {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 15px 0;
  cursor: pointer;
  list-style: none;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.55;
  color: var(--text-primary);
  transition: color 140ms var(--ease);
}

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

.page-faq .qa summary::marker {
  content: "";
}

.page-faq .qa summary:hover {
  color: var(--ember-300);
}

.page-faq .qa summary:focus-visible {
  outline: 2px solid var(--ember-500);
  outline-offset: 2px;
}

.page-faq .qa summary::after {
  content: "+";
  margin-left: auto;
  padding-left: 12px;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--ember-500);
}

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

.page-faq .qa__num {
  flex: 0 0 auto;
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--steel-400);
}

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

.page-faq .qa__body {
  padding: 0 0 18px;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--text-muted);
}

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

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

.page-faq .qa__body ol,
.page-faq .qa__body ul {
  margin: 0 0 10px;
  padding-left: 20px;
}

.page-faq .qa__body li {
  margin-bottom: 5px;
}

.page-faq .qa__body a {
  color: var(--ember-300);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-faq .qa__body a:hover {
  color: var(--text-primary);
}

/* ---------- 人工块 ---------- */
.page-faq .faq-contact {
  display: grid;
  gap: 14px;
  margin-top: 20px;
  padding: clamp(18px, 3vw, 26px);
  border: 1px solid var(--line-c);
  border-left: 3px solid var(--ember-500);
  background: var(--carbon-800);
}

.page-faq .faq-contact__title {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--steel-400);
}

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

.page-faq .faq-contact__list li {
  display: grid;
  gap: 2px;
  padding: 9px 12px;
  background: var(--carbon-800);
  font-size: 13px;
  line-height: 1.6;
  color: var(--text-muted);
}

.page-faq .faq-contact__list .mono {
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--card-yellow);
}

.page-faq .faq-contact__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
    align-items: end;
  }

  .page-faq .faq-contact__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 960px) {
  .page-faq .steps-layout {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.02fr);
    align-items: start;
  }

  .page-faq .qa__body {
    padding-left: 34px;
  }

  .page-faq .qa-group__head {
    gap: 16px;
  }
}

@media (min-width: 1024px) {
  .page-faq .manual-layout {
    grid-template-columns: var(--faq-idx-w) minmax(0, 1fr);
    align-items: start;
  }

  .page-faq .faq-index {
    position: sticky;
    top: calc(var(--topbar-h, 56px) + 20px);
    max-height: calc(100vh - var(--topbar-h, 56px) - 40px);
    overflow-y: auto;
  }
}

@media (min-width: 1400px) {
  .page-faq {
    --faq-idx-w: 300px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa summary,
  .page-faq .quick-jump a,
  .page-faq .faq-index__list a {
    transition: none;
  }
}
<<<END>>>