.page-faq {
  --faq-gap: clamp(1rem, 2.4vw, 2rem);
  --faq-section-gap: clamp(2.5rem, 5.5vw, 4.5rem);
  padding-bottom: clamp(3rem, 7vw, 5.5rem);
}

.page-faq .faq-crumbs {
  padding-top: clamp(1rem, 2vw, 1.5rem);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(1.5rem, 3.5vw, 3rem) clamp(2rem, 4vw, 3.25rem);
  border-bottom: 2px solid var(--line);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  top: -30%;
  right: 0;
  width: min(560px, 70vw);
  aspect-ratio: 1;
  background: radial-gradient(circle at 50% 50%, rgba(53, 224, 208, 0.16), rgba(53, 224, 208, 0) 70%);
  pointer-events: none;
}

.page-faq .faq-hero__grid {
  position: relative;
  display: grid;
  gap: clamp(1.5rem, 3vw, 2.5rem);
  align-items: end;
}

.page-faq .faq-hero__text h1 {
  margin: 0.65rem 0 0.9rem;
  font-family: var(--font-display);
  font-size: clamp(2rem, 6.4vw, 4rem);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--cream);
}

.page-faq .faq-hero__lead {
  max-width: 34em;
  margin: 0;
  color: var(--mist);
  font-size: clamp(1rem, 1.4vw, 1.0625rem);
  line-height: 1.75;
}

.page-faq .faq-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.25rem;
  margin: 1.35rem 0 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
  color: var(--sage);
}

.page-faq .faq-hero__meta-item {
  display: flex;
  align-items: center;
  gap: 0.45rem;
}

.page-faq .faq-hero__meta-item::before {
  content: "";
  width: 6px;
  height: 6px;
  background: var(--cyan);
  flex: none;
}

.page-faq .faq-hero__frame {
  box-shadow: var(--shadow-hard);
}

.page-faq .faq-hero__frame img,
.page-faq .faq-device__frame img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ---------- 主体两栏 ---------- */
.page-faq .faq-body {
  display: grid;
  gap: var(--faq-gap);
  padding-top: clamp(1.75rem, 3.5vw, 3rem);
}

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

.page-faq .faq-rail__title {
  margin: 0 0 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--sage);
}

.page-faq .faq-rail__list {
  display: flex;
  gap: 0.5rem;
  margin: 0;
  padding: 0 0 0.5rem;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-faq .faq-rail__item {
  flex: none;
}

.page-faq .faq-rail__link {
  display: inline-flex;
  align-items: baseline;
  gap: 0.45rem;
  padding: 0.45rem 0.7rem;
  border: 2px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  color: var(--mist);
  font-size: 0.8125rem;
  line-height: 1.3;
  text-decoration: none;
  white-space: nowrap;
  transition: border-color 180ms ease, color 180ms ease;
}

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

/* ---------- 章节 ---------- */
.page-faq .faq-flow {
  min-width: 0;
}

.page-faq .faq-section + .faq-section {
  margin-top: var(--faq-section-gap);
}

.page-faq .faq-section__head {
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
  padding-bottom: 0.7rem;
  border-bottom: 2px solid var(--line);
}

.page-faq .faq-section__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.3rem, 2.7vw, 1.85rem);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--cream);
}

.page-faq .faq-section__lead {
  max-width: 36em;
  margin: 1rem 0 1.35rem;
  color: var(--mist);
  font-size: 0.9375rem;
  line-height: 1.75;
}

.page-faq .faq-section__actions {
  margin: 1.25rem 0 0;
}

/* ---------- 三步 ---------- */
.page-faq .faq-steps {
  display: grid;
  gap: 0.9rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-step {
  padding: clamp(1rem, 2vw, 1.4rem);
  background: var(--panel);
  border: 2px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-hard);
}

.page-faq .faq-step__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(2rem, 4.5vw, 2.75rem);
  font-weight: 600;
  line-height: 1;
  color: var(--amber);
}

.page-faq .faq-step__title {
  margin: 0.7rem 0 0.45rem;
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--cream);
}

.page-faq .faq-step__text {
  margin: 0;
  color: var(--mist);
  font-size: 0.9375rem;
  line-height: 1.72;
}

/* ---------- 设备 ---------- */
.page-faq .faq-device {
  display: grid;
  gap: 1.25rem;
}

.page-faq .faq-device__list {
  display: grid;
  gap: 0.9rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-device__item {
  position: relative;
  padding-left: 1.1rem;
  color: var(--mist);
  font-size: 0.9375rem;
  line-height: 1.72;
}

.page-faq .faq-device__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 7px;
  height: 7px;
  background: var(--cyan);
}

.page-faq .faq-device__item strong {
  display: block;
  margin-bottom: 0.15rem;
  color: var(--cream);
  font-weight: 700;
}

.page-faq .faq-device__frame {
  border: 2px solid var(--line);
  box-shadow: var(--shadow-hard);
  min-height: 180px;
}

/* ---------- 会员三档 ---------- */
.page-faq .faq-tiers {
  display: grid;
  gap: 0.9rem;
}

.page-faq .faq-tier {
  padding: clamp(1rem, 2vw, 1.25rem);
  background: linear-gradient(160deg, var(--deep-a) 0%, var(--panel) 100%);
  border: 2px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 4px 4px 0 0 rgba(0, 0, 0, 0.4);
}

.page-faq .faq-tier--key {
  border-color: var(--amber);
  box-shadow: var(--shadow-hard);
}

.page-faq .faq-tier__name {
  margin: 0;
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--cream);
}

.page-faq .faq-tier__fit {
  margin: 0.35rem 0 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  line-height: 1.5;
  letter-spacing: 0.02em;
  color: var(--amber);
}

.page-faq .faq-tier__list {
  display: grid;
  gap: 0.4rem;
  margin: 0;
  padding: 0;
  list-style: none;
  color: var(--mist);
  font-size: 0.9375rem;
  line-height: 1.6;
}

.page-faq .faq-tier__list li {
  position: relative;
  padding-left: 1rem;
}

.page-faq .faq-tier__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 0.55rem;
  height: 2px;
  background: var(--cyan);
}

.page-faq .faq-tier-note {
  margin: 1rem 0 0;
  color: var(--sage);
  font-size: 0.875rem;
  line-height: 1.7;
}

/* ---------- 伤停 ---------- */
.page-faq .faq-inj-steps {
  display: grid;
  gap: 0.7rem;
  margin: 0 0 1.4rem;
  padding: 0;
  list-style: none;
  counter-reset: inj;
}

.page-faq .faq-inj-steps li {
  counter-increment: inj;
  display: flex;
  align-items: flex-start;
  gap: 0.7rem;
  color: var(--mist);
  font-size: 0.9375rem;
  line-height: 1.7;
}

.page-faq .faq-inj-steps li::before {
  content: counter(inj, decimal-leading-zero);
  flex: none;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 600;
  line-height: 1.9;
  color: var(--cyan);
}

.page-faq .faq-table-wrap {
  overflow-x: auto;
  border: 2px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-hard);
}

.page-faq .faq-table-wrap .data-table {
  min-width: 520px;
  margin: 0;
}

.page-faq .faq-table-wrap .tag {
  display: inline-block;
  white-space: nowrap;
}

/* ---------- 常见问题 ---------- */
.page-faq .faq-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}

.page-faq .faq-list {
  display: grid;
  gap: 0.65rem;
}

.page-faq .faq-q {
  background: var(--panel);
  border: 2px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 4px 4px 0 0 rgba(0, 0, 0, 0.35);
  transition: border-color 180ms ease, box-shadow 180ms ease;
}

.page-faq .faq-q[open] {
  border-left: 4px solid var(--cyan);
  box-shadow: var(--shadow-cyan);
}

.page-faq .faq-q summary {
  display: flex;
  align-items: flex-start;
  gap: 0.65rem;
  padding: 0.9rem 1rem;
  cursor: pointer;
  list-style: none;
  font-size: 0.9375rem;
  font-weight: 600;
  line-height: 1.6;
  color: var(--cream);
}

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

.page-faq .faq-q summary::after {
  content: "+";
  margin-left: auto;
  flex: none;
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--cyan);
}

.page-faq .faq-q[open] summary::after {
  content: "−";
}

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

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

.page-faq .faq-q__text {
  flex: 1;
  min-width: 0;
}

.page-faq .faq-q summary .tag {
  flex: none;
  margin-top: 0.1rem;
  font-size: 0.75rem;
}

.page-faq .faq-q__body {
  padding: 0 1rem 1rem;
}

.page-faq .faq-q__body p {
  margin: 0;
  color: var(--mist);
  font-size: 0.9375rem;
  line-height: 1.75;
}

.page-faq .filter-empty {
  margin: 1rem 0 0;
  color: var(--sage);
  font-size: 0.875rem;
}

/* ---------- 联系我们 ---------- */
.page-faq .faq-support {
  display: grid;
  gap: 1.35rem;
  padding: clamp(1.15rem, 3vw, 2rem);
  background: linear-gradient(150deg, var(--deep-a) 0%, var(--panel-2) 100%);
  border: 2px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-cyan);
}

.page-faq .faq-support__lead {
  margin: 0 0 1rem;
  color: var(--mist);
  font-size: 0.9375rem;
  line-height: 1.75;
}

.page-faq .faq-support__list {
  display: grid;
  gap: 0.7rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-support__line {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.5rem;
  color: var(--cream);
  font-size: 0.9375rem;
  line-height: 1.6;
}

.page-faq .faq-support__label {
  flex: none;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--sage);
}

.page-faq .faq-support__line a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 224, 208, 0.45);
  word-break: break-all;
}

.page-faq .faq-support__line a:hover,
.page-faq .faq-support__line a:focus-visible {
  color: var(--cream);
  border-bottom-color: var(--cream);
}

.page-faq .faq-support__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  align-content: start;
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-faq .faq-tiers {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-faq .faq-support {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
    align-items: start;
  }
}

@media (min-width: 820px) {
  .page-faq .faq-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-faq .faq-step:nth-child(2) {
    transform: translateY(14px);
  }

  .page-faq .faq-tiers {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-faq .faq-device {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.85fr);
    align-items: start;
  }
}

@media (min-width: 920px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  }
}

@media (min-width: 1024px) {
  .page-faq .faq-body {
    grid-template-columns: 172px minmax(0, 1fr);
    gap: clamp(2rem, 4vw, 3.5rem);
  }

  .page-faq .faq-rail__inner {
    position: sticky;
    top: 5.5rem;
  }

  .page-faq .faq-rail__list {
    flex-direction: column;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-faq .faq-rail__link {
    width: 100%;
    border-color: transparent;
    background: transparent;
    padding: 0.35rem 0;
  }

  .page-faq .faq-rail__link:hover,
  .page-faq .faq-rail__link:focus-visible {
    border-color: transparent;
    color: var(--cyan);
  }

  .page-faq .faq-list {
    max-width: 760px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-step:nth-child(2) {
    transform: none;
  }

  .page-faq .faq-q,
  .page-faq .faq-rail__link {
    transition: none;
  }
}
<<<END>>>