.page-faq {
  --faq-rail-w: 268px;
  --faq-gap: clamp(1.75rem, 4vw, 3.5rem);
  --faq-ink: #0C2547;
  background: var(--c-space);
  color: var(--c-star);
  font-family: var(--f-mono);
  padding-bottom: clamp(3rem, 8vw, 6rem);
}

/* ---------- 刊头 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding-block: clamp(2rem, 5vw, 3.5rem) clamp(2rem, 4vw, 3rem);
  border-bottom: 1px solid var(--c-line);
  background-image:
    linear-gradient(rgba(34, 211, 238, 0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(34, 211, 238, 0.055) 1px, transparent 1px);
  background-size: 52px 52px;
  background-position: center top;
}

.page-faq .faq-hero__inner {
  display: grid;
  gap: clamp(1.5rem, 3vw, 2.75rem);
  align-items: center;
}

@media (min-width: 960px) {
  .page-faq .faq-hero__inner {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
  }
}

.page-faq .crumb {
  margin-bottom: 1.35rem;
}

.page-faq .crumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 0.78rem;
  letter-spacing: 0.05em;
  color: var(--c-mist);
}

.page-faq .crumb__list li + li::before {
  content: "/";
  margin: 0 0.55rem;
  color: var(--c-line-cyan);
}

.page-faq .crumb__list a {
  color: var(--c-mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}

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

.page-faq .crumb__list [aria-current="page"] {
  color: var(--c-star);
}

.page-faq .faq-hero__eyebrow {
  margin: 0 0 0.75rem;
  font-family: var(--f-mono);
  font-size: 0.76rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-cyan);
}

.page-faq .faq-hero h1 {
  margin: 0 0 1rem;
  font-family: var(--f-display);
  font-weight: 800;
  font-size: clamp(1.85rem, 4.8vw, 3.1rem);
  line-height: 1.16;
  letter-spacing: 0.02em;
  color: var(--c-star);
  max-width: 24ch;
}

.page-faq .faq-hero__lede {
  margin: 0 0 1.6rem;
  font-family: var(--f-serif);
  font-size: clamp(0.98rem, 1.6vw, 1.08rem);
  line-height: 1.9;
  color: var(--c-star);
  opacity: 0.86;
  max-width: 54ch;
}

.page-faq .faq-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem 1.9rem;
  margin: 0;
  padding: 1.1rem 0 0;
  border-top: 1px solid var(--c-line);
  list-style: none;
  font-size: 0.84rem;
  color: var(--c-mist);
}

.page-faq .faq-hero__facts li {
  display: flex;
  align-items: baseline;
  gap: 0.4rem;
}

.page-faq .faq-hero__num {
  font-family: var(--f-mono);
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--c-amber);
}

.page-faq .faq-hero__figure {
  margin: 0;
  padding: 0.5rem;
  border: 1px solid var(--c-line-cyan);
  background: var(--c-navy);
  box-shadow: var(--shadow-float);
}

.page-faq .faq-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
}

/* ---------- 分屏外壳 ---------- */
.page-faq .faq-shell {
  display: grid;
  gap: var(--faq-gap);
  align-items: start;
  padding-top: clamp(2rem, 5vw, 3.5rem);
}

@media (min-width: 1000px) {
  .page-faq .faq-shell {
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
  }
}

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

/* ---------- 左侧问题索引 ---------- */
.page-faq .faq-rail {
  background: var(--c-navy);
  border: 1px solid var(--c-line);
  border-top: 2px solid var(--c-cyan);
  padding: 1rem 1rem 0.85rem;
}

@media (min-width: 1000px) {
  .page-faq .faq-rail {
    position: sticky;
    top: 6.5rem;
  }
}

.page-faq .faq-rail__label {
  margin: 0 0 0.75rem;
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--c-mist);
}

.page-faq .faq-rail__list {
  display: flex;
  gap: 0.4rem;
  margin: 0;
  padding: 0 0 0.3rem;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

@media (min-width: 1000px) {
  .page-faq .faq-rail__list {
    flex-direction: column;
    overflow: visible;
    padding-bottom: 0;
  }
}

.page-faq .faq-rail__link {
  display: flex;
  align-items: baseline;
  gap: 0.55rem;
  padding: 0.5rem 0.65rem;
  border: 1px solid transparent;
  border-radius: var(--r-sm);
  color: var(--c-mist);
  text-decoration: none;
  font-size: 0.85rem;
  white-space: nowrap;
  transition: color var(--t-fast) var(--ease),
    border-color var(--t-fast) var(--ease),
    background-color var(--t-fast) var(--ease);
}

.page-faq .faq-rail__link:hover,
.page-faq .faq-rail__link:focus-visible {
  color: var(--c-star);
  border-color: var(--c-line-cyan);
  background: rgba(34, 211, 238, 0.08);
}

.page-faq .faq-rail__num {
  font-family: var(--f-mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--c-amber);
}

/* ---------- 章节 ---------- */
.page-faq .faq-sec {
  scroll-margin-top: 6.5rem;
}

.page-faq .faq-sec + .faq-sec {
  margin-top: clamp(2.5rem, 5vw, 4rem);
  padding-top: clamp(2rem, 4vw, 3rem);
  border-top: 1px solid var(--c-line-soft);
}

.page-faq .sec-head {
  display: flex;
  align-items: baseline;
  gap: 0.85rem;
  margin: 0 0 0.85rem;
}

.page-faq .sec-num {
  font-family: var(--f-mono);
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--c-amber);
}

.page-faq .sec-title {
  margin: 0;
  font-family: var(--f-display);
  font-weight: 700;
  font-size: clamp(1.3rem, 2.8vw, 1.85rem);
  letter-spacing: 0.04em;
  color: var(--c-star);
}

.page-faq .faq-sec__lede {
  margin: 0 0 1.35rem;
  padding-left: 0.9rem;
  border-left: 2px solid var(--c-line-cyan);
  font-family: var(--f-serif);
  font-size: 1rem;
  line-height: 1.85;
  color: var(--c-mist);
  max-width: 60ch;
}

/* ---------- 问答卡 ---------- */
.page-faq .qa {
  background: var(--c-paper);
  color: var(--faq-ink);
  border: 1px solid rgba(6, 26, 51, 0.16);
  border-radius: var(--r-sm);
  box-shadow: 6px 6px 0 rgba(12, 37, 71, 0.55);
  margin: 0 0 0.9rem;
  transition: box-shadow var(--t-fast) var(--ease), transform var(--t-fast) var(--ease);
}

.page-faq .qa:hover {
  transform: translate(-2px, -2px);
  box-shadow: 8px 8px 0 rgba(12, 37, 71, 0.62);
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa,
  .page-faq .qa:hover {
    transform: none;
    transition: none;
  }
}

.page-faq .qa__q {
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
  padding: 0.95rem 1.15rem;
  cursor: pointer;
  list-style: none;
  font-family: var(--f-serif);
  font-size: clamp(0.98rem, 1.7vw, 1.08rem);
  font-weight: 600;
  line-height: 1.55;
  color: var(--faq-ink);
}

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

.page-faq .qa__q::marker {
  content: "";
}

.page-faq .qa__q::after {
  content: "";
  flex: 0 0 auto;
  align-self: center;
  width: 1.2rem;
  height: 1.2rem;
  margin-left: auto;
  border: 1.5px solid var(--faq-ink);
  border-radius: 50%;
  background-image:
    linear-gradient(var(--faq-ink), var(--faq-ink)),
    linear-gradient(var(--faq-ink), var(--faq-ink));
  background-repeat: no-repeat;
  background-position: center center, center center;
  background-size: 0.58rem 1.5px, 1.5px 0.58rem;
  transition: transform var(--t-mid) var(--ease), background-size var(--t-mid) var(--ease);
}

.page-faq .qa[open] .qa__q::after {
  transform: rotate(90deg);
  background-size: 0.58rem 1.5px, 1.5px 0;
}

.page-faq .qa__idx {
  flex: 0 0 auto;
  padding: 0.16rem 0.42rem 0.12rem;
  border-radius: var(--r-sm);
  background: var(--c-navy);
  color: var(--c-amber);
  font-family: var(--f-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
}

.page-faq .qa__a {
  padding: 0.85rem 1.15rem 1.15rem;
  margin: 0 1.15rem 0;
  border-top: 1px dashed rgba(6, 26, 51, 0.22);
  font-family: var(--f-mono);
  font-size: 0.9rem;
  line-height: 1.85;
  color: var(--faq-ink);
}

.page-faq .qa__a p {
  margin: 0 0 0.7rem;
}

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

.page-faq .qa__hl {
  color: #8A4B00;
  font-weight: 700;
  letter-spacing: 0.03em;
}

/* ---------- 插图与表格 ---------- */
.page-faq .faq-fig {
  margin: 0 0 1.35rem;
}

.page-faq .faq-fig img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--c-line);
}

.page-faq .faq-fig figcaption {
  margin-top: 0.6rem;
  font-size: 0.76rem;
  letter-spacing: 0.04em;
  color: var(--c-mist);
}

.page-faq .faq-table-wrap {
  margin: 0 0 1.35rem;
  border: 1px solid var(--c-line);
  background: var(--c-navy);
  overflow-x: auto;
}

.page-faq .faq-table {
  width: 100%;
  min-width: 34rem;
  border-collapse: collapse;
  font-family: var(--f-mono);
  font-size: 0.85rem;
}

.page-faq .faq-table caption {
  padding: 0.85rem 1rem 0.5rem;
  text-align: left;
  font-size: 0.74rem;
  letter-spacing: 0.12em;
  color: var(--c-mist);
}

.page-faq .faq-table th,
.page-faq .faq-table td {
  padding: 0.7rem 1rem;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--c-line-soft);
}

.page-faq .faq-table thead th {
  background: rgba(34, 211, 238, 0.07);
  color: var(--c-star);
  font-family: var(--f-display);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.06em;
}

.page-faq .faq-table tbody th {
  color: var(--c-mist);
  font-weight: 500;
  white-space: nowrap;
}

.page-faq .faq-table tbody td {
  color: var(--c-star);
}

.page-faq .faq-table tbody tr:last-child th,
.page-faq .faq-table tbody tr:last-child td {
  border-bottom: 0;
}

.page-faq .faq-pill {
  display: inline-block;
  padding: 0.1rem 0.5rem 0.14rem;
  border-radius: var(--r-sm);
  font-family: var(--f-mono);
  font-size: 0.74rem;
  letter-spacing: 0.05em;
  line-height: 1.6;
}

.page-faq .faq-pill--direct {
  background: var(--c-amber);
  color: var(--c-space);
}

.page-faq .faq-pill--auth {
  background: var(--c-cyan);
  color: var(--c-space);
}

/* ---------- 产品线与安装清单 ---------- */
.page-faq .faq-lines {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin: 0 0 1.35rem;
  padding: 0;
  list-style: none;
}

.page-faq .faq-lines li {
  padding: 0.32rem 0.75rem;
  border: 1px solid var(--c-line);
  border-radius: var(--r-sm);
  background: var(--c-navy);
  color: var(--c-star);
  font-size: 0.82rem;
  letter-spacing: 0.03em;
}

.page-faq .faq-list {
  display: grid;
  gap: 0.65rem;
  margin: 0.25rem 0 0.5rem;
  padding: 0;
  list-style: none;
}

.page-faq .faq-list li {
  padding-left: 0.9rem;
  border-left: 1px solid var(--c-line-amber);
  font-size: 0.88rem;
  line-height: 1.78;
  color: var(--faq-ink);
}

.page-faq .faq-list__key {
  display: inline-block;
  margin-right: 0.5rem;
  font-family: var(--f-display);
  font-weight: 700;
  letter-spacing: 0.05em;
  color: #8A4B00;
}

/* ---------- 联系方式 ---------- */
.page-faq .faq-contact {
  display: grid;
  gap: 1.1rem;
  margin: 0 0 1.35rem;
  padding: 1.25rem;
  border: 1px solid var(--c-line-amber);
  border-radius: var(--r-sm);
  background:
    linear-gradient(135deg, rgba(245, 158, 11, 0.09), rgba(34, 211, 238, 0.06));
}

@media (min-width: 720px) {
  .page-faq .faq-contact {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-faq .faq-contact__key {
  margin: 0 0 0.4rem;
  font-family: var(--f-mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-amber);
}

.page-faq .faq-contact__val {
  margin: 0 0 0.75rem;
  font-family: var(--f-mono);
  font-size: clamp(0.95rem, 2.2vw, 1.1rem);
  letter-spacing: 0.03em;
  color: var(--c-star);
  word-break: break-word;
}

.page-faq .faq-contact__note {
  margin: 0.55rem 0 0;
  font-size: 0.8rem;
  line-height: 1.75;
  color: var(--c-mist);
}

.page-faq .faq-note {
  margin: 0;
  padding: 0.65rem 0 0.65rem 0.9rem;
  border-left: 2px solid var(--c-amber);
  font-size: 0.84rem;
  line-height: 1.8;
  color: var(--c-mist);
}

.page-faq .faq-note a {
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--c-line-cyan);
}

.page-faq .faq-note a:hover,
.page-faq .faq-note a:focus-visible {
  color: var(--c-star);
  border-bottom-color: var(--c-star);
}

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