.page-faq {
  --faq-rail: 236px;
  --faq-gap: clamp(28px, 4vw, 56px);
  padding-bottom: clamp(48px, 8vw, 96px);
}

.page-faq .sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  padding: calc(var(--header-h) + clamp(28px, 6vw, 72px)) 0 clamp(36px, 6vw, 72px);
  background:
    radial-gradient(120% 90% at 88% 4%, rgba(180, 18, 31, .38) 0%, rgba(110, 10, 24, .16) 42%, rgba(10, 11, 15, 0) 72%),
    linear-gradient(160deg, #6E0A18 0%, #0A0B0F 62%);
  border-bottom: 1px solid var(--line-soft);
}

.page-faq .faq-hero-frame {
  padding: clamp(24px, 4vw, 52px);
  background: rgba(10, 11, 15, .62);
  backdrop-filter: blur(2px);
}

.page-faq .faq-hero-frame .crumb {
  margin-bottom: clamp(20px, 3vw, 34px);
}

.page-faq .kicker {
  color: var(--cyan);
  margin: 0 0 16px;
}

.page-faq h1 {
  font-weight: 200;
  font-size: clamp(30px, 5.2vw, 68px);
  line-height: 1.12;
  letter-spacing: -.02em;
  margin: 0 0 clamp(18px, 2.6vw, 28px);
  max-width: 22ch;
  color: var(--ink);
}

.page-faq .faq-hero-frame .lead {
  max-width: 62ch;
  color: var(--ink);
  opacity: .84;
  font-size: clamp(15px, 1.4vw, 17px);
  line-height: 1.8;
  margin: 0 0 clamp(28px, 4vw, 44px);
}

.page-faq .hero-metrics {
  list-style: none;
  margin: 0;
  padding: clamp(20px, 2.4vw, 26px) 0 0;
  border-top: 1px solid var(--line-soft);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(16px, 2.4vw, 32px);
}

.page-faq .hero-metrics li {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-faq .hero-metrics .num {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: clamp(26px, 3.6vw, 40px);
  line-height: 1;
  color: var(--cyan);
}

.page-faq .hero-metrics li:nth-child(2) .num {
  color: var(--yellow);
}

.page-faq .metric-label {
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--slate);
}

/* ---------- 区块通用标题 ---------- */
.page-faq .sec-head {
  max-width: 62ch;
  margin-bottom: clamp(28px, 4vw, 48px);
}

.page-faq .sec-title {
  font-weight: 300;
  font-size: clamp(24px, 3.4vw, 42px);
  line-height: 1.2;
  letter-spacing: -.01em;
  margin: 12px 0 14px;
  color: var(--ink);
}

.page-faq .sec-head .prose {
  margin: 0;
  color: var(--slate);
}

/* ---------- 01 文档分类 ---------- */
.page-faq .faq-index-sec {
  padding-top: clamp(48px, 7vw, 96px);
}

.page-faq .cat-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line);
}

.page-faq .cat-card {
  background: var(--black-900);
  padding: clamp(20px, 2.6vw, 32px);
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: background var(--dur) var(--ease);
}

.page-faq .cat-card:hover {
  background: var(--black-700);
}

.page-faq .cat-num {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--cyan);
  letter-spacing: .08em;
}

.page-faq .cat-card h3 {
  margin: 0;
  font-size: clamp(16px, 1.6vw, 19px);
  font-weight: 500;
  color: var(--ink);
}

.page-faq .cat-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--slate);
}

/* ---------- 02 步骤 ---------- */
.page-faq .faq-steps-sec {
  padding-top: clamp(56px, 8vw, 112px);
}

.page-faq .guide-steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 48px);
}

.page-faq .step-rail {
  border: 1px solid var(--line);
  background: var(--black-700);
  padding: 20px 18px;
}

.page-faq .rail-title {
  margin: 0 0 14px;
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--slate);
  text-transform: uppercase;
}

.page-faq .rail-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px 12px;
}

.page-faq .rail-group {
  grid-column: 1 / -1;
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px solid var(--line-soft);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--crimson-glow);
}

.page-faq .rail-group:first-child {
  margin-top: 0;
  padding-top: 0;
  border-top: 0;
}

.page-faq .rail-list a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 7px 0;
  font-size: 13px;
  color: var(--slate);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-faq .rail-list a .num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--graphite);
  filter: brightness(2.2);
}

.page-faq .rail-list a:hover,
.page-faq .rail-list a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
  outline: none;
}

.page-faq .rail-list a:hover .num,
.page-faq .rail-list a:focus-visible .num {
  color: var(--cyan);
  filter: none;
}

.page-faq .step-body {
  display: flex;
  flex-direction: column;
  gap: clamp(36px, 5vw, 64px);
}

.page-faq .phase-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 22px;
}

.page-faq .phase-tag {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--black-900);
  background: var(--yellow);
  padding: 4px 10px;
}

.page-faq .phase-head h3 {
  margin: 0;
  font-size: clamp(17px, 2vw, 22px);
  font-weight: 500;
  color: var(--ink);
}

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

.page-faq .step-item {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: clamp(12px, 2vw, 22px);
  padding: clamp(18px, 2.4vw, 26px) 0;
  border-bottom: 1px solid var(--line-soft);
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-faq .step-item:last-child {
  border-bottom: 0;
}

.page-faq .step-idx {
  font-family: var(--font-mono);
  font-size: clamp(22px, 3vw, 34px);
  line-height: 1;
  color: var(--graphite);
  filter: brightness(2.6);
  transition: color var(--dur) var(--ease), filter var(--dur) var(--ease);
}

.page-faq .step-item:hover .step-idx {
  color: var(--cyan);
  filter: none;
}

.page-faq .step-copy h4 {
  margin: 0 0 8px;
  font-size: clamp(15px, 1.5vw, 17px);
  font-weight: 500;
  color: var(--ink);
}

.page-faq .step-copy p {
  margin: 0;
  max-width: 66ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--slate);
}

.page-faq .step-figure {
  margin: clamp(24px, 3vw, 36px) 0 0;
  border: 1px solid var(--line);
}

.page-faq .step-figure .media__cap {
  padding: 12px 16px;
  font-size: 12px;
  color: var(--slate);
  border-top: 1px solid var(--line-soft);
}

/* ---------- 03 两端差异 ---------- */
.page-faq .faq-compare-sec {
  padding-top: clamp(56px, 8vw, 112px);
}

.page-faq .compare-shell {
  position: relative;
  padding: clamp(24px, 4vw, 52px);
  background:
    linear-gradient(102deg, rgba(180, 18, 31, .22) 0%, rgba(10, 11, 15, 0) 58%),
    var(--black-700);
  border: 1px solid var(--line);
}

.page-faq .compare-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line);
}

.page-faq .compare-col {
  background: var(--black-900);
  padding: clamp(20px, 2.6vw, 32px);
}

.page-faq .compare-col--alt {
  background: #101319;
}

.page-faq .compare-head {
  margin: 0 0 16px;
  font-size: 13px;
  letter-spacing: .16em;
  font-weight: 500;
  color: var(--cyan);
}

.page-faq .compare-col--alt .compare-head {
  color: var(--yellow);
}

.page-faq .compare-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.page-faq .compare-list li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink);
  opacity: .82;
}

.page-faq .compare-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .62em;
  width: 7px;
  height: 7px;
  background: var(--cyan);
}

.page-faq .compare-col--alt .compare-list li::before {
  background: var(--yellow);
}

.page-faq .compare-figure {
  margin: clamp(24px, 3vw, 36px) 0 0;
  border: 1px solid var(--line-soft);
}

.page-faq .compare-figure .media__cap {
  padding: 12px 16px;
  font-size: 12px;
  color: var(--slate);
  border-top: 1px solid var(--line-soft);
}

/* ---------- 04 常见问题 ---------- */
.page-faq .faq-qa-sec {
  padding-top: clamp(56px, 8vw, 112px);
}

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

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

.page-faq .qa-acc .acc-btn {
  width: 100%;
  text-align: left;
  background: transparent;
  border: 0;
  padding: clamp(18px, 2.2vw, 24px) 44px clamp(18px, 2.2vw, 24px) 0;
  font-family: var(--font-sans);
  font-size: clamp(15px, 1.5vw, 17px);
  font-weight: 500;
  color: var(--ink);
  cursor: pointer;
  position: relative;
  transition: color var(--dur) var(--ease);
}

.page-faq .qa-acc .acc-btn:hover {
  color: var(--crimson-glow);
}

.page-faq .qa-acc .acc-btn[aria-expanded="true"] {
  color: var(--cyan);
}

.page-faq .qa-acc .acc-inner {
  padding: 0 clamp(0px, 4vw, 72px) clamp(20px, 2.4vw, 28px) 0;
}

.page-faq .qa-acc .acc-inner p {
  margin: 0;
  max-width: 68ch;
  font-size: 14px;
  line-height: 1.85;
  color: var(--slate);
}

/* ---------- 05 兼容表 ---------- */
.page-faq .faq-compat-sec {
  padding-top: clamp(56px, 8vw, 112px);
}

.page-faq .table-scroll {
  overflow-x: auto;
  border: 1px solid var(--line);
  background: var(--black-700);
  -webkit-overflow-scrolling: touch;
}

.page-faq .compat-table {
  width: 100%;
  min-width: 720px;
  border-collapse: collapse;
  font-size: 14px;
}

.page-faq .compat-table th,
.page-faq .compat-table td {
  text-align: left;
  padding: 15px clamp(14px, 1.8vw, 22px);
  border-bottom: 1px solid var(--line-soft);
  vertical-align: top;
}

.page-faq .compat-table thead th {
  font-size: 11px;
  letter-spacing: .16em;
  font-weight: 500;
  color: var(--slate);
  background: var(--black-900);
  border-bottom: 1px solid var(--line);
  white-space: nowrap;
}

.page-faq .compat-table tbody td {
  color: var(--ink);
  opacity: .82;
}

.page-faq .compat-table tbody td.num {
  font-family: var(--font-mono);
  color: var(--cyan);
  opacity: 1;
  white-space: nowrap;
}

.page-faq .compat-table .advice {
  color: var(--slate);
  opacity: .5;
  transition: color var(--dur) var(--ease), opacity var(--dur) var(--ease);
}

.page-faq .compat-table tbody tr {
  transition: background var(--dur) var(--ease);
}

.page-faq .compat-table tbody tr:hover {
  background: rgba(25, 242, 212, .06);
}

.page-faq .compat-table tbody tr:hover .advice {
  color: var(--cyan);
  opacity: 1;
}

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

.page-faq .selfcheck {
  list-style: none;
  margin: clamp(26px, 3vw, 38px) 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-faq .selfcheck li {
  display: flex;
  gap: 14px;
  align-items: baseline;
  font-size: 14px;
  line-height: 1.75;
  color: var(--slate);
  padding-left: 0;
}

.page-faq .selfcheck .num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--black-900);
  background: var(--cyan);
  padding: 3px 8px;
  flex: none;
}

/* ---------- 06 联系 ---------- */
.page-faq .faq-help-sec {
  padding-top: clamp(56px, 8vw, 112px);
}

.page-faq .help-frame {
  padding: clamp(24px, 4vw, 56px);
  background:
    radial-gradient(90% 120% at 6% 0%, rgba(110, 10, 24, .55) 0%, rgba(10, 11, 15, 0) 66%),
    var(--black-700);
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 52px);
}

.page-faq .help-copy .sec-title {
  margin-top: 12px;
}

.page-faq .help-list {
  list-style: none;
  margin: clamp(20px, 2.4vw, 28px) 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.page-faq .help-list li {
  font-size: 14px;
  line-height: 1.75;
  color: var(--slate);
  padding-left: 16px;
  border-left: 2px solid var(--crimson-700);
}

.page-faq .help-list strong {
  color: var(--ink);
  font-weight: 500;
}

.page-faq .help-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(24px, 3vw, 34px);
}

.page-faq .help-side {
  border-top: 1px solid var(--line);
  padding-top: clamp(20px, 2.4vw, 28px);
}

.page-faq .help-side-title {
  margin: 0 0 14px;
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--slate);
}

.page-faq .help-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
}

.page-faq .help-links a {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line-soft);
  font-size: 14px;
  color: var(--ink);
  opacity: .8;
  text-decoration: none;
  transition: color var(--dur) var(--ease), opacity var(--dur) var(--ease), padding-left var(--dur) var(--ease);
}

.page-faq .help-links a .num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--slate);
}

.page-faq .help-links a:hover,
.page-faq .help-links a:focus-visible {
  color: var(--cyan);
  opacity: 1;
  padding-left: 6px;
  outline: none;
}

.page-faq .help-links a:hover .num,
.page-faq .help-links a:focus-visible .num {
  color: var(--cyan);
}

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

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

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

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

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

@media (min-width: 960px) {
  .page-faq .cat-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-faq .guide-steps {
    grid-template-columns: var(--faq-rail) minmax(0, 1fr);
    gap: var(--faq-gap);
    align-items: start;
  }

  .page-faq .step-rail {
    position: sticky;
    top: calc(var(--header-h) + 24px);
  }

  .page-faq .rail-list {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .page-faq .help-frame {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    gap: clamp(32px, 5vw, 72px);
  }

  .page-faq .help-side {
    border-top: 0;
    border-left: 1px solid var(--line);
    padding-top: 0;
    padding-left: clamp(24px, 3vw, 40px);
  }
}

@media (min-width: 1200px) {
  .page-faq .step-item {
    grid-template-columns: 60px minmax(0, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .cat-card,
  .page-faq .step-idx,
  .page-faq .rail-list a,
  .page-faq .compat-table tbody tr,
  .page-faq .compat-table .advice,
  .page-faq .help-links a,
  .page-faq .qa-acc .acc-btn {
    transition: none;
  }
}
<<<END>>>