.page-faq {
  --faq-radius: 2px;
  --faq-sticky: 96px;
  color: var(--paper);
  padding-bottom: clamp(48px, 8vw, 88px);
}

/* ---------- 面包屑 ---------- */
.page-faq .breadcrumb {
  margin: 20px 0 0;
}

.page-faq .breadcrumb-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.02em;
}

.page-faq .breadcrumb-list li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--rule);
}

.page-faq .breadcrumb-link {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) ease, border-color var(--dur) ease;
}

.page-faq .breadcrumb-link:hover,
.page-faq .breadcrumb-link:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-faq .breadcrumb-current {
  color: var(--paper);
}

/* ---------- 通用小元素 ---------- */
.page-faq .eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--cyan);
  text-transform: uppercase;
}

.page-faq .eyebrow::before {
  content: "";
  width: 22px;
  height: 2px;
  background: var(--neon);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  display: grid;
  gap: 28px;
  padding: 30px 0 40px;
  border-bottom: 1px solid var(--rule);
}

.page-faq .faq-hero h1 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(32px, 6.4vw, 58px);
  line-height: 1.04;
  letter-spacing: -0.02em;
  color: var(--paper);
  max-width: 15em;
}

.page-faq .faq-lede {
  margin: 18px 0 0;
  max-width: 38em;
  font-size: 16px;
  line-height: 1.8;
  color: var(--paper);
  opacity: 0.9;
}

.page-faq .faq-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-faq .faq-hero-more {
  margin: 16px 0 0;
  font-size: 13px;
  color: var(--mist);
}

.page-faq .faq-hero-more a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(56, 242, 196, 0.45);
}

.page-faq .faq-hero-more a:hover,
.page-faq .faq-hero-more a:focus-visible {
  border-bottom-color: var(--cyan);
}

.page-faq .faq-hero-card {
  align-self: stretch;
  background: var(--ink-2);
  border: 1px solid var(--rule);
  border-left: 3px solid var(--cyan);
  border-radius: var(--faq-radius);
  padding: 18px 18px 10px;
  box-shadow: var(--shadow-paper);
}

.page-faq .quick-title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--orange);
  text-transform: uppercase;
}

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

.page-faq .quick-list li {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  align-items: baseline;
  gap: 10px;
  padding: 10px 0;
  border-top: 1px solid rgba(44, 78, 68, 0.7);
}

.page-faq .quick-list li:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-faq .quick-key {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--mist);
}

.page-faq .quick-list a {
  color: var(--paper);
  font-size: 14px;
  line-height: 1.5;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) ease, border-color var(--dur) ease;
}

.page-faq .quick-list a:hover,
.page-faq .quick-list a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

/* ---------- 三步定位法 ---------- */
.page-faq .faq-steps {
  padding: clamp(36px, 6vw, 64px) 0;
  border-bottom: 1px solid var(--rule);
}

.page-faq .section-head h2 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 4vw, 38px);
  line-height: 1.15;
  letter-spacing: -0.015em;
  color: var(--paper);
  max-width: 20em;
}

.page-faq .section-sub {
  margin: 12px 0 0;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist);
}

.page-faq .steps-grid {
  display: grid;
  gap: 26px;
  margin-top: 28px;
}

.page-faq .step-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-faq .step-item {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 14px;
  padding: 16px 16px 18px;
  background: var(--ink-2);
  border: 1px solid var(--rule);
  border-radius: var(--faq-radius);
}

.page-faq .step-num {
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1.1;
  color: var(--cyan);
  letter-spacing: 0.02em;
}

.page-faq .step-body h3 {
  margin: 2px 0 0;
  font-size: 16px;
  line-height: 1.45;
  color: var(--paper);
}

.page-faq .step-body p {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
}

.page-faq .faq-figure {
  margin: 0;
  padding: 8px;
  background: var(--ink-2);
  border: 1px solid var(--rule);
  border-radius: var(--faq-radius);
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  background: var(--ink-3);
}

.page-faq .faq-figure figcaption {
  margin-top: 10px;
  padding: 0 4px 2px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--mist);
}

.page-faq .faq-figure--tall img {
  aspect-ratio: 8 / 9;
}

/* 路径示意 */
.page-faq .path-map {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-faq .path-node {
  position: relative;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 14px;
  background: var(--ink-3);
  border: 1px solid var(--rule);
  border-radius: var(--faq-radius);
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--paper);
}

.page-faq .path-node:last-child {
  border-color: var(--cyan);
  color: var(--cyan);
}

.page-faq .path-num {
  font-size: 11px;
  color: var(--orange);
  letter-spacing: 0.06em;
}

/* ---------- 问答主体 ---------- */
.page-faq .qa-layout {
  display: grid;
  gap: 26px;
  padding: clamp(36px, 6vw, 64px) 0;
  border-bottom: 1px solid var(--rule);
}

.page-faq .qa-index {
  background: var(--ink-2);
  border: 1px solid var(--rule);
  border-top: 3px solid var(--orange);
  border-radius: var(--faq-radius);
  padding: 16px;
}

.page-faq .qa-index-title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--orange);
}

.page-faq .qa-index-list {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: qa-idx;
}

.page-faq .qa-index-list li {
  counter-increment: qa-idx;
}

.page-faq .qa-index-link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 10px 8px;
  color: var(--mist);
  font-size: 15px;
  line-height: 1.45;
  text-decoration: none;
  border-bottom: 1px solid rgba(44, 78, 68, 0.6);
  transition: color var(--dur) ease, background var(--dur) ease;
}

.page-faq .qa-index-list li:last-child .qa-index-link {
  border-bottom: 0;
}

.page-faq .qa-index-link::before {
  content: counter(qa-idx, decimal-leading-zero);
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--cyan);
  letter-spacing: 0.04em;
}

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

.page-faq .qa-index-foot {
  margin: 14px 0 0;
  font-size: 12px;
  line-height: 1.6;
  color: var(--mist);
}

.page-faq .qa-group {
  scroll-margin-top: var(--faq-sticky);
}

.page-faq .qa-group + .qa-group {
  margin-top: 40px;
}

.page-faq .qa-group-head {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  align-items: baseline;
  gap: 4px 12px;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--rule);
}

.page-faq .qa-group-num {
  grid-row: span 2;
  font-family: var(--font-mono);
  font-size: 26px;
  line-height: 1;
  color: var(--orange);
}

.page-faq .qa-group-head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(21px, 3.4vw, 29px);
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-faq .qa-group-note {
  margin: 4px 0 0;
  font-size: 13px;
  line-height: 1.65;
  color: var(--mist);
}

/* ---------- 折叠组 ---------- */
.page-faq .fold {
  background: var(--ink-2);
  border: 1px solid var(--rule);
  border-radius: var(--faq-radius);
  margin-bottom: 10px;
  scroll-margin-top: var(--faq-sticky);
  transition: border-color var(--dur) ease;
}

.page-faq .fold summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 15px 16px;
  cursor: pointer;
  list-style: none;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--paper);
  transition: background var(--dur) ease, color var(--dur) ease;
}

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

.page-faq .fold summary::after {
  content: "+";
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 19px;
  line-height: 1;
  color: var(--cyan);
  transition: color var(--dur) ease, transform var(--dur) ease;
}

.page-faq .fold summary:hover,
.page-faq .fold summary:focus-visible {
  background: var(--ink-3);
}

.page-faq .fold summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -3px;
}

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

.page-faq .fold[open] summary {
  background: var(--ink-3);
  border-bottom: 1px solid var(--rule);
}

.page-faq .fold[open] summary::after {
  content: "−";
  color: var(--orange);
  transform: rotate(180deg);
}

.page-faq .fold-body {
  padding: 16px;
  background: var(--ink-3);
}

.page-faq .fold-body p {
  margin: 0;
  max-width: 60ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--paper);
  opacity: 0.92;
}

.page-faq .fold-link {
  display: inline-block;
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(56, 242, 196, 0.5);
  transition: border-color var(--dur) ease, color var(--dur) ease;
}

.page-faq .fold-link::after {
  content: " →";
}

.page-faq .fold-link:hover,
.page-faq .fold-link:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--orange);
}

/* ---------- 设备分组 ---------- */
.page-faq .device-split {
  display: grid;
  gap: 20px;
}

.page-faq .device-folds {
  min-width: 0;
}

/* ---------- 联系收尾 ---------- */
.page-faq .faq-contact {
  padding: clamp(36px, 6vw, 64px) 0 0;
}

.page-faq .contact-card {
  position: relative;
  background: var(--ink-2);
  border: 1px solid var(--rule);
  border-radius: var(--faq-radius);
  padding: clamp(20px, 4vw, 34px);
  box-shadow: var(--shadow-paper);
  overflow: hidden;
}

.page-faq .contact-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: var(--neon);
}

.page-faq .contact-card h2 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(22px, 3.6vw, 32px);
  line-height: 1.2;
  letter-spacing: -0.015em;
  color: var(--paper);
  max-width: 22em;
}

.page-faq .contact-lede {
  margin: 14px 0 0;
  max-width: 42em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

.page-faq .contact-list {
  display: grid;
  gap: 10px;
  margin: 22px 0 0;
  padding: 0;
}

.page-faq .contact-row {
  display: grid;
  grid-template-columns: 60px minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
  padding: 10px 12px;
  background: var(--ink-3);
  border-left: 2px solid var(--rule);
}

.page-faq .contact-row dt {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--orange);
  letter-spacing: 0.06em;
}

.page-faq .contact-row dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
  color: var(--paper);
  word-break: break-word;
}

.page-faq .contact-tips {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-faq .contact-tips li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.65;
  color: var(--paper);
  opacity: 0.88;
}

.page-faq .contact-tips li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 6px;
  height: 6px;
  background: var(--cyan);
}

.page-faq .contact-card .btn {
  margin-top: 24px;
}

/* ---------- 平板与桌面 ---------- */
@media (min-width: 700px) {
  .page-faq .path-map {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 10px;
  }

  .page-faq .path-node:not(:last-child)::after {
    content: "";
    position: absolute;
    right: -10px;
    top: 50%;
    width: 10px;
    height: 2px;
    background: var(--cyan);
    transform: translateY(-50%);
  }

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

  .page-faq .contact-row:last-child {
    grid-column: 1 / -1;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 46px;
    align-items: end;
    padding: 44px 0 56px;
  }

  .page-faq .steps-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.82fr);
    gap: 40px;
    align-items: start;
  }

  .page-faq .device-split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 300px);
    gap: 24px;
    align-items: start;
  }

  .page-faq .contact-tips {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px 22px;
  }
}

@media (min-width: 1000px) {
  .page-faq .qa-layout {
    grid-template-columns: 228px minmax(0, 1fr);
    gap: 44px;
    align-items: start;
  }

  .page-faq .qa-index {
    position: sticky;
    top: var(--faq-sticky);
  }

  .page-faq .qa-main {
    min-width: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .fold,
  .page-faq .fold summary,
  .page-faq .fold summary::after,
  .page-faq .qa-index-link,
  .page-faq .breadcrumb-link,
  .page-faq .quick-list a,
  .page-faq .fold-link {
    transition: none;
  }

  .page-faq .fold[open] summary::after {
    transform: none;
  }
}
<<<END>>>