.page-faq {
  --faq-cut: 14px;
  --faq-gap: 14px;
}

/* ---------- Hero ---------- */
.page-faq .faq-hero {
  position: relative;
  isolation: isolate;
  padding: clamp(26px, 5vw, 54px) 0 clamp(34px, 6vw, 66px);
  background:
    radial-gradient(ellipse 80% 62% at 92% -12%, rgba(51, 230, 209, .16), transparent 70%),
    radial-gradient(ellipse 62% 52% at 0% 112%, rgba(200, 255, 51, .1), transparent 72%),
    linear-gradient(180deg, var(--ink-900) 0%, var(--ink-800) 100%);
  overflow: hidden;
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(143, 160, 196, .07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(143, 160, 196, .07) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: radial-gradient(ellipse 72% 82% at 72% 18%, #000, transparent 76%);
  mask-image: radial-gradient(ellipse 72% 82% at 72% 18%, #000, transparent 76%);
}

.page-faq .faq-h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2rem, 7vw, 4rem);
  line-height: 1.05;
  letter-spacing: -.035em;
  margin: 12px 0 16px;
  color: var(--text);
}

.page-faq .faq-lead {
  max-width: 62ch;
  margin: 0 0 30px;
  font-size: clamp(1rem, 1.6vw, 1.08rem);
  line-height: 1.85;
  color: var(--text-dim);
}

.page-faq .faq-facts {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  margin: 0;
  padding: 0;
  max-width: 760px;
}

.page-faq .faq-fact {
  padding: 13px 16px;
  background: rgba(18, 34, 74, .58);
  border-left: 2px solid var(--accent);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%);
}

.page-faq .faq-fact dt {
  margin-bottom: 5px;
  font-size: .7rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--text-dim);
}

.page-faq .faq-fact dd {
  margin: 0;
  font-family: var(--font-body);
  font-size: .92rem;
  line-height: 1.35;
  color: var(--text);
}

.page-faq .faq-fact dd .num {
  font-family: var(--font-mono);
  font-size: clamp(1.15rem, 2.4vw, 1.5rem);
  font-weight: 700;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
  margin-right: 4px;
}

@media (min-width: 560px) {
  .page-faq .faq-facts {
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
  }
}

/* ---------- 三步卡 ---------- */
.page-faq .faq-steps-figure {
  margin: 0 0 clamp(22px, 4vw, 34px);
}

.page-faq .faq-step-list {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--faq-gap);
}

.page-faq .faq-step {
  position: relative;
  z-index: 1;
  padding: 22px 20px 24px;
  background: linear-gradient(160deg, var(--ink-800), var(--ink-900));
  border: 1px solid var(--line);
  clip-path: polygon(0 0, calc(100% - var(--faq-cut)) 0, 100% var(--faq-cut), 100% 100%, 0 100%);
  transition: transform .28s var(--ease);
}

.page-faq .faq-step::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 3px;
  height: 100%;
  background: linear-gradient(180deg, var(--accent), transparent);
  opacity: .8;
}

.page-faq .faq-step:hover {
  transform: translateY(-4px);
}

.page-faq .faq-step-num {
  display: inline-block;
  margin-bottom: 14px;
  padding: 4px 12px 4px 9px;
  font-family: var(--font-mono);
  font-size: .82rem;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--ink-900);
  background: var(--accent);
  clip-path: polygon(0 0, 100% 0, calc(100% - 8px) 100%, 0 100%);
}

.page-faq .faq-step-title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 1.08rem;
  font-weight: 800;
  line-height: 1.35;
  color: var(--text);
}

.page-faq .faq-step-text {
  margin: 0;
  font-size: .92rem;
  line-height: 1.78;
  color: var(--text-dim);
}

@media (min-width: 760px) {
  .page-faq .faq-step-list {
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
  }

  .page-faq .faq-step-list::before {
    content: "";
    position: absolute;
    top: 44px;
    left: 8%;
    right: 8%;
    height: 2px;
    z-index: 0;
    background: linear-gradient(90deg, transparent, var(--accent-2), var(--accent), transparent);
    opacity: .4;
  }
}

/* ---------- 问答区 ---------- */
.page-faq .faq-qa-grid {
  display: grid;
  gap: 22px;
}

.page-faq .faq-side-title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--fog-400);
}

.page-faq .faq-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-faq .faq-item {
  margin-bottom: 12px;
  background: var(--ink-800);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, calc(100% - var(--faq-cut)) 0, 100% var(--faq-cut), 100% 100%, 0 100%);
  transition: border-color .25s var(--ease), background .25s var(--ease);
}

.page-faq .faq-item[open] {
  background: var(--ink-700);
  border-color: rgba(200, 255, 51, .34);
}

.page-faq .faq-item summary {
  position: relative;
  list-style: none;
  cursor: pointer;
  padding: 16px 52px 16px 18px;
  font-size: .98rem;
  font-weight: 700;
  line-height: 1.55;
  color: var(--text);
  transition: color .2s var(--ease);
}

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

.page-faq .faq-item summary:hover {
  color: var(--accent);
}

.page-faq .faq-item summary::after {
  content: "";
  position: absolute;
  right: 21px;
  top: 50%;
  width: 9px;
  height: 9px;
  margin-top: -7px;
  border-right: 2px solid var(--accent);
  border-bottom: 2px solid var(--accent);
  transform: rotate(45deg);
  transition: transform .25s var(--ease), margin-top .25s var(--ease);
}

.page-faq .faq-item[open] summary::after {
  transform: rotate(225deg);
  margin-top: -2px;
}

.page-faq .faq-answer {
  padding: 0 18px 18px;
  font-size: .93rem;
  line-height: 1.85;
  color: var(--text-dim);
}

.page-faq .faq-answer p {
  margin: 0;
}

.page-faq .filter-empty {
  margin: 8px 0 0;
  padding: 16px 18px;
  font-size: .9rem;
  color: var(--text-dim);
  border: 1px dashed var(--line-strong);
}

@media (min-width: 900px) {
  .page-faq .faq-qa-grid {
    grid-template-columns: 210px minmax(0, 1fr);
    gap: 44px;
    align-items: start;
  }

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

  .page-faq .faq-filters {
    flex-direction: column;
    align-items: stretch;
  }

  .page-faq .faq-filters .filter-btn {
    text-align: left;
  }
}

/* ---------- 指标构成 ---------- */
.page-faq .faq-metrics-grid {
  display: grid;
  gap: 26px;
}

.page-faq .faq-metrics-note {
  margin: 18px 0 0;
  font-size: .9rem;
  color: var(--text-dim);
}

.page-faq .faq-metrics-note a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}

.page-faq .faq-metric-list {
  display: grid;
  gap: 2px;
}

.page-faq .faq-metric {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 8px 14px;
  align-items: baseline;
  padding: 14px 0 12px;
  border-bottom: 1px dashed var(--line);
}

.page-faq .faq-metric-name {
  font-size: .95rem;
  font-weight: 700;
  color: var(--text);
}

.page-faq .faq-metric-val {
  font-family: var(--font-mono);
  font-size: .92rem;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}

.page-faq .faq-metric-bar {
  grid-column: 1 / -1;
  display: block;
  height: 5px;
  background: rgba(143, 160, 196, .16);
  overflow: hidden;
}

.page-faq .faq-metric-bar span {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
}

@media (min-width: 880px) {
  .page-faq .faq-metrics-grid {
    grid-template-columns: 1fr 1.08fr;
    gap: 48px;
    align-items: center;
  }
}

/* ---------- 设备 ---------- */
.page-faq .faq-device-layout {
  display: grid;
  gap: 26px;
}

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

.page-faq .faq-device-list {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-faq .faq-device-list li {
  padding-left: 16px;
  border-left: 2px solid var(--line-strong);
  font-size: .94rem;
  line-height: 1.78;
  color: var(--text-dim);
}

.page-faq .faq-device-list .tag {
  margin-right: 8px;
}

@media (min-width: 840px) {
  .page-faq .faq-device-layout {
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: center;
  }
}

/* ---------- 联络卡 ---------- */
.page-faq .faq-contact-card {
  padding: clamp(24px, 5vw, 48px);
  background:
    radial-gradient(ellipse 90% 120% at 100% 0%, rgba(200, 255, 51, .13), transparent 62%),
    radial-gradient(ellipse 70% 90% at 0% 100%, rgba(51, 230, 209, .1), transparent 65%),
    linear-gradient(150deg, var(--ink-800), var(--ink-900));
  border: 1px solid var(--line-strong);
  clip-path: polygon(0 0, calc(100% - 26px) 0, 100% 26px, 100% 100%, 26px 100%, 0 calc(100% - 26px));
}

.page-faq .faq-contact-rows {
  margin: 26px 0 0;
  display: grid;
  gap: 12px;
}

.page-faq .faq-contact-row {
  padding: 13px 16px;
  background: rgba(4, 10, 24, .58);
  border-left: 2px solid var(--accent);
}

.page-faq .faq-contact-row dt {
  margin-bottom: 6px;
  font-size: .7rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--fog-400);
}

.page-faq .faq-contact-row dd {
  margin: 0;
  font-size: .94rem;
  line-height: 1.55;
  color: var(--text);
  word-break: break-word;
}

.page-faq .faq-contact-row dd.u-mono {
  font-family: var(--font-mono);
  font-size: .88rem;
  color: var(--accent);
}

.page-faq .faq-contact-actions {
  margin-top: 26px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

@media (min-width: 640px) {
  .page-faq .faq-contact-rows {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-step,
  .page-faq .faq-item,
  .page-faq .faq-item summary,
  .page-faq .faq-item summary::after {
    transition: none;
  }

  .page-faq .faq-step:hover {
    transform: none;
  }
}
<<<PAGE_CSS_END>>>