.page-faq {
  background: var(--c-ink);
  color: var(--c-paper);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding: calc(var(--shell-offset) + 1.25rem) 0 clamp(2.25rem, 5vw, 3.5rem);
  border-bottom: 1px solid var(--line);
}
.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line) 1px, transparent 1px);
  background-size: 96px 96px;
  opacity: 0.22;
  -webkit-mask-image: radial-gradient(120% 95% at 76% 8%, #000 0%, transparent 70%);
  mask-image: radial-gradient(120% 95% at 76% 8%, #000 0%, transparent 70%);
  pointer-events: none;
}
.page-faq .faq-hero-inner {
  position: relative;
  z-index: 1;
}
.page-faq .faq-hero .breadcrumb {
  margin-bottom: 1.5rem;
}
.page-faq .faq-hero .eyebrow {
  display: block;
  color: var(--c-mist);
  margin: 0 0 0.85rem;
}
.page-faq .faq-h1 {
  margin: 0 0 1.25rem;
  font-family: var(--f-head);
  font-size: var(--fs-64);
  font-weight: 800;
  line-height: 1.06;
  letter-spacing: -0.02em;
  max-width: 15em;
  color: var(--c-paper);
}
.page-faq .faq-h1::after {
  content: "";
  display: block;
  width: 72px;
  height: 2px;
  margin-top: 1.5rem;
  background: var(--c-cyan);
}
.page-faq .faq-lede {
  margin: 0;
  max-width: 34em;
  font-size: var(--fs-17);
  line-height: 1.75;
  color: var(--c-mist);
}
.page-faq .faq-coord {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.55rem;
  margin-top: clamp(1.75rem, 4vw, 2.75rem);
  padding: 0.9rem 0;
}
.page-faq .faq-coord span {
  color: var(--c-mist);
  font-size: var(--fs-13);
}
.page-faq .faq-coord b {
  color: var(--c-cyan);
  font-weight: 600;
}
.page-faq .faq-hero-plot {
  position: absolute;
  right: -40px;
  bottom: -10px;
  width: min(52vw, 460px);
  height: auto;
  opacity: 0.28;
  pointer-events: none;
  z-index: 0;
}
.page-faq .faq-hero-plot path {
  fill: none;
  stroke: var(--c-copper);
  stroke-width: 1;
}
.page-faq .faq-hero-plot circle {
  fill: var(--c-cyan);
}

/* ---------- 通用小节标题 ---------- */
.page-faq .sec-title {
  margin: 0 0 1.75rem;
  padding-bottom: 0.85rem;
  border-bottom: 1px solid var(--line);
  font-family: var(--f-head);
  font-size: var(--fs-28);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--c-paper);
}

/* ---------- 三步流程条 ---------- */
.page-faq .faq-steps {
  background: var(--c-ink-2);
  padding: clamp(2.25rem, 5vw, 3.5rem) 0;
}
.page-faq .step-rail {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
}
.page-faq .step-item {
  position: relative;
  padding: 1.4rem 0 1.75rem;
  border-top: 2px solid var(--c-cyan);
  transition: background-color var(--dur) var(--ease);
}
.page-faq .step-no {
  display: block;
  font-size: var(--fs-28);
  letter-spacing: 0.06em;
  color: var(--c-cyan);
  margin-bottom: 0.6rem;
}
.page-faq .step-title {
  margin: 0 0 0.6rem;
  font-family: var(--f-head);
  font-size: var(--fs-20);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--c-paper);
}
.page-faq .step-desc {
  margin: 0;
  max-width: 32em;
  font-size: var(--fs-15);
  line-height: 1.75;
  color: var(--c-mist);
}
.page-faq .step-hint {
  display: inline-block;
  margin-top: 0.9rem;
  font-family: var(--f-mono);
  font-size: var(--fs-13);
  letter-spacing: 0.1em;
  color: var(--c-mist);
  border-left: 2px solid var(--line);
  padding-left: 0.6rem;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.page-faq .step-item:hover .step-hint,
.page-faq .step-item:focus-within .step-hint {
  color: var(--c-cyan);
  border-color: var(--c-cyan);
}

/* ---------- 问答区 ---------- */
.page-faq .faq-qa {
  padding: clamp(2.75rem, 6vw, 4.5rem) 0;
  background:
    linear-gradient(180deg, var(--c-ink) 0%, var(--c-ink) 62%, var(--c-ink-2) 100%);
}
.page-faq .faq-qa-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.25rem;
}
.page-faq .qa-index {
  align-self: start;
}
.page-faq .qa-index .eyebrow {
  display: block;
  color: var(--c-mist);
  margin: 0 0 0.85rem;
}
.page-faq .qa-list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-faq .qa-link {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
  padding: 0.68rem 0;
  border-bottom: 1px solid var(--line-soft);
  color: var(--c-mist);
  text-decoration: none;
  font-size: var(--fs-15);
  line-height: 1.5;
  transition: color var(--dur) var(--ease);
}
.page-faq .qa-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 100%;
  height: 1px;
  background: var(--c-cyan);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--dur) var(--ease);
}
.page-faq .qa-link:hover,
.page-faq .qa-link:focus-visible {
  color: var(--c-paper);
}
.page-faq .qa-link:hover::after,
.page-faq .qa-link:focus-visible::after {
  transform: scaleX(1);
}
.page-faq .qa-no {
  flex: none;
  font-size: var(--fs-13);
  letter-spacing: 0.08em;
  color: var(--c-cyan);
}

.page-faq .qa-item {
  scroll-margin-top: calc(var(--shell-offset) + 1rem);
  padding: 0 0 2.25rem;
  margin: 0 0 2.25rem;
  border-bottom: 1px solid var(--line-soft);
}
.page-faq .qa-item:first-child {
  padding-top: 0.25rem;
}
.page-faq .qa-item:last-child {
  border-bottom: 0;
  margin-bottom: 0;
  padding-bottom: 0;
}
.page-faq .qa-q {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
  margin: 0 0 1rem;
  font-family: var(--f-head);
  font-size: var(--fs-20);
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: -0.01em;
  color: var(--c-paper);
}
.page-faq .qa-a {
  max-width: 42rem;
}
.page-faq .qa-a p {
  margin: 0 0 1rem;
  font-size: var(--fs-17);
  line-height: 1.85;
  color: var(--c-paper);
}
.page-faq .qa-a p:last-child {
  margin-bottom: 0;
}

/* 参数标签与组合说明 */
.page-faq .param-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 1.1rem 0 0;
}
.page-faq .param {
  display: inline-block;
  padding: 0.3rem 0.65rem;
  border: 1px solid var(--line-cyan);
  border-radius: var(--radius);
  background: rgba(0, 229, 255, 0.06);
  font-family: var(--f-mono);
  font-size: var(--fs-13);
  letter-spacing: 0.05em;
  color: var(--c-cyan);
}
.page-faq .combo-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.85rem;
  margin: 1.25rem 0 0;
}
.page-faq .combo-card {
  padding: 1.05rem 1.15rem;
  background: var(--c-slate);
  border: 1px solid var(--line-soft);
  border-left: 2px solid var(--c-cyan);
}
.page-faq .combo-head {
  margin: 0 0 0.45rem;
  font-size: var(--fs-13);
  letter-spacing: 0.08em;
  color: var(--c-cyan);
}
.page-faq .combo-card p:last-child {
  margin: 0;
  font-size: var(--fs-15);
  line-height: 1.7;
  color: var(--c-mist);
}

/* 更新状态行 */
.page-faq .update-line {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin: 1.25rem 0 0;
  font-family: var(--f-mono);
  font-size: var(--fs-13);
  letter-spacing: 0.06em;
  color: var(--c-mint);
}

/* 联系信息 */
.page-faq .contact-line {
  list-style: none;
  margin: 1.25rem 0;
  padding: 1rem 1.15rem;
  background: var(--c-slate);
  border: 1px solid var(--line-soft);
}
.page-faq .contact-line li {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  padding: 0.4rem 0;
  font-size: var(--fs-15);
  line-height: 1.6;
  color: var(--c-paper);
}
.page-faq .contact-line li + li {
  border-top: 1px solid var(--line-soft);
}
.page-faq .contact-key {
  flex: none;
  width: 3.2rem;
  font-size: var(--fs-13);
  letter-spacing: 0.1em;
  color: var(--c-mist);
}
.page-faq .contact-line a {
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line-cyan);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.page-faq .contact-line a:hover {
  color: var(--c-paper);
  border-color: var(--c-paper);
}

/* 图版 */
.page-faq .faq-figure {
  margin: 1.75rem 0 0;
}
.page-faq .faq-figure .plate-media {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--line-soft);
  background: var(--c-ink-2);
  object-fit: cover;
}
.page-faq .plate-caption {
  display: block;
  margin-top: 0.7rem;
  font-size: var(--fs-13);
  line-height: 1.6;
  color: var(--c-mist);
}

/* 返回问题清单 */
.page-faq .qa-return {
  display: inline-flex;
  align-items: center;
  margin-top: 1.5rem;
  padding: 0.35rem 0.7rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-family: var(--f-mono);
  font-size: var(--fs-13);
  letter-spacing: 0.08em;
  color: var(--c-mist);
  text-decoration: none;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.page-faq .qa-return:hover,
.page-faq .qa-return:focus-visible {
  color: var(--c-cyan);
  border-color: var(--c-cyan);
}

/* ---------- 底部去向 ---------- */
.page-faq .faq-tail {
  padding: clamp(2.5rem, 6vw, 4rem) 0 clamp(3rem, 7vw, 5rem);
}
.page-faq a.index-card {
  display: block;
  height: 100%;
  color: inherit;
  text-decoration: none;
}
.page-faq .tail-note {
  margin: 1.75rem 0 0;
  font-size: var(--fs-15);
  color: var(--c-mist);
}
.page-faq .tail-note a {
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line-cyan);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.page-faq .tail-note a:hover {
  color: var(--c-paper);
  border-color: var(--c-paper);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-faq .combo-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 720px) {
  .page-faq .faq-coord {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.5rem;
  }
}

@media (min-width: 900px) {
  .page-faq .step-rail {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-faq .step-item {
    padding: 1.5rem 1.75rem 1.9rem 0;
  }
  .page-faq .step-item + .step-item {
    padding-left: 1.75rem;
    border-left: 1px solid var(--line-soft);
  }
  .page-faq .faq-qa-grid {
    grid-template-columns: 32fr 68fr;
    gap: clamp(2.5rem, 5vw, 4.25rem);
  }
  .page-faq .qa-index {
    position: sticky;
    top: calc(var(--shell-offset) + 1rem);
  }
  .page-faq .qa-q {
    font-size: var(--fs-28);
  }
}

@media (min-width: 1200px) {
  .page-faq .qa-item {
    padding-bottom: 2.75rem;
    margin-bottom: 2.75rem;
  }
  .page-faq .faq-hero-plot {
    right: 0;
  }
}
<<<END>>>