.page-faq {
  --faq-rail-w: 246px;
  --faq-gap: clamp(24px, 4vw, 56px);
  background: var(--ink);
  color: var(--white);
  font-family: var(--font-sans);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-head {
  padding: clamp(20px, 3.5vw, 36px) 0 clamp(28px, 4.5vw, 52px);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(1100px 320px at 84% -12%, rgba(72, 242, 255, 0.10), transparent 70%),
    radial-gradient(700px 260px at 4% 110%, rgba(92, 36, 54, 0.35), transparent 72%),
    var(--ink);
}

.page-faq .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: clamp(18px, 3vw, 30px);
  font-family: var(--font-condensed);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-faq .breadcrumbs a {
  color: var(--cool);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--ease), border-color var(--ease);
}

.page-faq .breadcrumbs a:hover {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-faq .faq-head-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 3.5vw, 44px);
}

.page-faq .faq-head-copy h1 {
  margin: 12px 0 16px;
  max-width: 20em;
  font-family: var(--font-serif);
  font-size: clamp(26px, 4.4vw, 46px);
  font-weight: 600;
  line-height: 1.24;
  letter-spacing: 0.01em;
  color: var(--white);
}

.page-faq .faq-head-copy .lede {
  margin: 0;
  max-width: 46em;
  font-size: clamp(14px, 1.5vw, 16px);
  line-height: 1.85;
  color: var(--cool);
}

.page-faq .faq-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-facts li {
  padding: 12px 12px 14px;
  border: 1px solid var(--line);
  border-top: 2px solid var(--cyan);
  background: var(--panel);
}

.page-faq .fact-value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(16px, 2vw, 21px);
  line-height: 1.2;
  color: var(--white);
}

.page-faq .fact-label {
  display: block;
  margin-top: 6px;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.page-faq .faq-hero-figure {
  margin: 0;
}

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

.page-faq .img-caption {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.7;
  letter-spacing: 0.03em;
  color: var(--muted);
}

/* ---------- 布局 ---------- */
.page-faq .faq-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--faq-gap);
  padding-top: clamp(28px, 4.5vw, 56px);
  padding-bottom: clamp(40px, 6vw, 80px);
}

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

/* ---------- 左侧主题索引 ---------- */
.page-faq .faq-rail {
  padding: 18px 18px 20px;
  border: 1px solid var(--line);
  background: var(--panel);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
}

.page-faq .rail-kicker {
  margin: 0 0 12px;
  font-family: var(--font-condensed);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-faq .rail-list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 4px;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-faq .rail-list li {
  flex: 0 0 auto;
}

.page-faq .rail-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  border-left: 2px solid transparent;
  color: var(--cool);
  font-size: 14px;
  line-height: 1.4;
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--ease), background var(--ease), border-color var(--ease);
}

.page-faq .rail-item:hover {
  color: var(--white);
  border-left-color: var(--cyan);
  background: rgba(72, 242, 255, 0.08);
}

.page-faq .rail-item:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-faq .rail-idx {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--orange);
}

.page-faq .rail-foot {
  margin: 14px 0 0;
  font-size: 12px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 问答分组 ---------- */
.page-faq .faq-group {
  padding-bottom: clamp(24px, 4vw, 46px);
  margin-bottom: clamp(24px, 4vw, 46px);
  border-bottom: 1px solid var(--line);
  scroll-margin-top: 96px;
}

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

.page-faq .group-head {
  display: grid;
  gap: 10px;
}

.page-faq .group-index {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-faq .group-head h2 {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(20px, 2.8vw, 28px);
  font-weight: 600;
  line-height: 1.32;
  color: var(--white);
}

.page-faq .group-head h2 svg {
  flex: none;
  width: 20px;
  height: 20px;
  color: var(--cyan);
}

.page-faq .group-lede {
  margin: 0;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--cool);
}

.page-faq .inline-link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(72, 242, 255, 0.45);
  transition: border-color var(--ease);
}

.page-faq .inline-link:hover {
  border-bottom-color: var(--cyan);
}

.page-faq .faq-inline-figure {
  max-width: 520px;
  margin: clamp(20px, 3vw, 30px) 0 clamp(8px, 1.5vw, 14px);
}

/* ---------- 折叠问答 ---------- */
.page-faq .qa-list {
  margin-top: clamp(14px, 2vw, 22px);
}

.page-faq .qa {
  border-top: 1px solid var(--line);
}

.page-faq .qa summary {
  position: relative;
  display: block;
  padding: 16px 40px 16px 0;
  list-style: none;
  cursor: pointer;
  font-size: clamp(15px, 1.6vw, 17px);
  font-weight: 500;
  line-height: 1.65;
  color: var(--white);
  transition: color var(--ease);
}

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

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

.page-faq .qa summary::after {
  content: "+";
  position: absolute;
  top: 50%;
  right: 6px;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--cyan);
  transition: color var(--ease);
}

.page-faq .qa[open] summary::after {
  content: "\2212";
}

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

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

.page-faq .kw {
  font-style: normal;
  border-bottom: 1px solid var(--cyan);
  padding-bottom: 1px;
}

.page-faq .qa-a {
  margin: 0 0 18px;
  padding: 16px 18px;
  border-left: 2px solid var(--cyan);
  background: var(--panel);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
  font-size: 15px;
  line-height: 1.85;
  color: var(--cool);
}

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

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

.page-faq .qa-a .inline-link {
  color: var(--cyan);
}

/* ---------- 联系方式条 ---------- */
.page-faq .contact-strip {
  margin-top: clamp(22px, 3vw, 30px);
  padding: clamp(18px, 2.6vw, 26px);
  border-left: 3px solid var(--orange);
  background: var(--archive);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
}

.page-faq .contact-strip-title {
  margin: 0;
  font-family: var(--font-condensed);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--orange);
}

.page-faq .contact-strip-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin: 16px 0 0;
}

.page-faq .contact-strip-grid div {
  min-width: 0;
}

.page-faq .cs-key {
  margin: 0 0 4px;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--muted);
}

.page-faq .cs-val {
  margin: 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--white);
  overflow-wrap: anywhere;
}

.page-faq .contact-strip-note {
  margin: 18px 0 16px;
  max-width: 62ch;
  font-size: 13px;
  line-height: 1.8;
  color: var(--cool);
}

.page-faq .contact-strip .btn {
  display: inline-block;
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-faq .faq-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-faq .contact-strip-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-head-grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: end;
  }
}

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

  .page-faq .faq-rail {
    position: sticky;
    top: 96px;
  }

  .page-faq .rail-list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-faq .rail-item {
    white-space: normal;
  }
}

@media (max-width: 959px) {
  .page-faq .rail-foot {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa summary,
  .page-faq .qa summary::after,
  .page-faq .rail-item,
  .page-faq .breadcrumbs a,
  .page-faq .inline-link {
    transition: none;
  }
}
<<<END>>>