.page-faq {
  --faq-num-w: 30px;
  padding-block-start: 0;
}

.page-faq .faq-top {
  padding-block-start: clamp(12px, 2vw, 22px);
}

.page-faq .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  margin: 0 0 clamp(16px, 2.6vw, 26px);
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--mist);
}

.page-faq .breadcrumb li {
  display: flex;
  align-items: center;
}

.page-faq .breadcrumb li + li::before {
  content: "/";
  margin-inline: 8px;
  color: var(--line);
}

.page-faq .breadcrumb a {
  color: var(--silver);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

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

.page-faq .breadcrumb [aria-current="page"] {
  color: var(--paper);
}

/* ---------- hero ---------- */
.page-faq .faq-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.4vw, 44px);
  padding-block-end: clamp(26px, 4vw, 48px);
  border-bottom: 2px solid var(--line);
}

.page-faq .faq-hero__lead h1 {
  margin-block: 10px 14px;
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.015em;
  text-wrap: balance;
}

.page-faq .faq-hero__lead .lede {
  max-width: 54ch;
  margin: 0;
  color: var(--silver);
  font-size: clamp(15px, 1.15vw, 17px);
  line-height: 1.65;
}

.page-faq .faq-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-block-start: clamp(18px, 2.4vw, 28px);
}

/* ---------- 顶栏示意 ---------- */
.page-faq .topbar-demo {
  width: 100%;
  max-width: 372px;
  margin-inline: auto;
  padding: clamp(12px, 1.6vw, 18px);
  border: 2px solid var(--line);
  background: linear-gradient(158deg, var(--panel), var(--ink) 72%);
  box-shadow: var(--shadow-hard);
  cursor: default;
  transition: border-color 0.24s var(--ease), box-shadow 0.24s var(--ease);
}

.page-faq .topbar-demo:hover,
.page-faq .topbar-demo:focus,
.page-faq .topbar-demo:focus-within {
  border-color: var(--lime-deep);
  box-shadow: 5px 5px 0 rgba(200, 255, 61, 0.16);
  outline: none;
}

.page-faq .topbar-demo__screen {
  border: 2px solid var(--line);
  background: var(--ink);
  border-radius: 12px;
  padding: 10px 10px 14px;
}

.page-faq .topbar-demo__status {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--mist);
  padding-inline: 4px;
  padding-block-end: 8px;
}

.page-faq .topbar-demo__signal {
  width: 22px;
  height: 6px;
  border: 1px solid var(--line);
  background: linear-gradient(90deg, var(--lime) 60%, transparent 60%);
}

.page-faq .topbar-demo__bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 9px 10px;
  border: 2px solid var(--line);
  background: var(--panel);
}

.page-faq .topbar-demo__logo {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 15px;
  letter-spacing: 0.02em;
  color: var(--paper);
}

.page-faq .topbar-demo__acts {
  display: flex;
  align-items: center;
  gap: 12px;
}

.page-faq .topbar-demo__ic {
  position: relative;
  display: block;
  width: 14px;
  height: 14px;
}

.page-faq .topbar-demo__ic--search {
  border: 2px solid var(--lime);
  border-radius: 50%;
}

.page-faq .topbar-demo__ic--search::after {
  content: "";
  position: absolute;
  inset-inline-end: -5px;
  inset-block-end: -4px;
  width: 6px;
  height: 2px;
  background: var(--lime);
  transform: rotate(45deg);
  transform-origin: left center;
}

.page-faq .topbar-demo__ic--star {
  width: 11px;
  height: 11px;
  background: var(--pulse);
  transform: rotate(45deg);
  box-shadow: 0 0 0 3px rgba(53, 167, 255, 0.16);
}

.page-faq .topbar-demo__tabs {
  display: flex;
  gap: 6px;
  margin-block-start: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
}

.page-faq .topbar-demo__tabs span {
  padding: 5px 10px;
  border: 1px solid var(--line);
  color: var(--mist);
  letter-spacing: 0.04em;
}

.page-faq .topbar-demo__tabs .is-on {
  border-color: var(--lime);
  background: var(--lime);
  color: var(--ink);
  font-weight: 700;
}

.page-faq .topbar-demo__lines {
  display: grid;
  gap: 7px;
  margin-block-start: 12px;
}

.page-faq .topbar-demo__lines span {
  display: block;
  height: 8px;
  background: linear-gradient(90deg, rgba(201, 211, 208, 0.22), rgba(201, 211, 208, 0.05));
}

.page-faq .topbar-demo__lines span:nth-child(1) { width: 92%; }
.page-faq .topbar-demo__lines span:nth-child(2) { width: 74%; }
.page-faq .topbar-demo__lines span:nth-child(3) { width: 58%; }

.page-faq .topbar-demo__tip {
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  padding-inline: 0;
  padding-block: 0;
  border-left: 3px solid var(--pulse);
  background: rgba(53, 167, 255, 0.09);
  transition: max-height 0.34s var(--ease), opacity 0.26s var(--ease),
    padding 0.34s var(--ease);
}

.page-faq .topbar-demo__tip p {
  margin: 0 0 6px;
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--silver);
}

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

.page-faq .topbar-demo__tip b {
  color: var(--lime);
  font-weight: 700;
}

.page-faq .topbar-demo:hover .topbar-demo__tip,
.page-faq .topbar-demo:focus .topbar-demo__tip,
.page-faq .topbar-demo:focus-within .topbar-demo__tip {
  max-height: 140px;
  opacity: 1;
  padding: 10px 12px;
  margin-block-start: 12px;
}

/* ---------- 布局 ---------- */
.page-faq .faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3vw, 44px);
  padding-block: clamp(28px, 4.5vw, 56px) clamp(44px, 6vw, 84px);
}

.page-faq .faq-rail__plate {
  margin: 0 0 14px;
  color: var(--mist);
}

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

.page-faq .faq-rail__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 10px 12px;
  border-left: 2px solid var(--line);
  color: var(--silver);
  font-size: 14px;
  line-height: 1.4;
  text-decoration: none;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease),
    background 0.18s var(--ease);
}

.page-faq .faq-rail__link:hover,
.page-faq .faq-rail__link:focus-visible {
  color: var(--paper);
  border-left-color: var(--lime-deep);
  background: rgba(200, 255, 61, 0.05);
}

.page-faq .faq-rail__link.is-active {
  color: var(--lime);
  border-left-color: var(--lime);
  background: rgba(200, 255, 61, 0.09);
}

.page-faq .faq-rail__num {
  flex: none;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--mist);
  letter-spacing: 0.04em;
}

.page-faq .faq-rail__link.is-active .faq-rail__num {
  color: var(--lime);
}

.page-faq .faq-rail__card {
  margin-block-start: 22px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--silver);
}

.page-faq .faq-rail__card-title {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--amber);
}

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

.page-faq .faq-rail__card-link {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid var(--lime-deep);
}

.page-faq .faq-rail__card-link:hover,
.page-faq .faq-rail__card-link:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--paper);
}

/* ---------- 章节 ---------- */
.page-faq .faq-sec {
  scroll-margin-top: calc(var(--header-h) + 20px);
  padding-block-end: clamp(28px, 4vw, 48px);
  margin-block-end: clamp(28px, 4vw, 48px);
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-sec--last {
  padding-block-end: 0;
  margin-block-end: 0;
  border-bottom: none;
}

.page-faq .faq-sec__head {
  margin-block-end: clamp(16px, 2vw, 24px);
}

.page-faq .faq-sec__head .plate {
  color: var(--lime);
}

.page-faq .faq-sec__head h2 {
  margin-block: 8px 10px;
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-faq .faq-sec__intro {
  max-width: 62ch;
  margin: 0;
  color: var(--silver);
  font-size: 15px;
  line-height: 1.65;
}

.page-faq .faq-sec__intro a {
  color: var(--lime);
}

/* ---------- 手风琴 ---------- */
.page-faq .qa {
  margin-block-end: 10px;
  border: 2px solid var(--line);
  background: var(--panel);
  transition: border-color 0.18s var(--ease), background 0.18s var(--ease);
}

.page-faq .qa:hover {
  border-color: var(--lime-deep);
}

.page-faq .qa[open] {
  border-color: var(--lime);
  background: linear-gradient(180deg, rgba(200, 255, 61, 0.07), var(--panel) 62%);
}

.page-faq .qa__sum {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: clamp(13px, 1.6vw, 18px) clamp(14px, 1.8vw, 20px);
  cursor: pointer;
  list-style: none;
  font-size: clamp(15px, 1.2vw, 16.5px);
  font-weight: 500;
  line-height: 1.45;
  color: var(--paper);
  transition: color 0.18s var(--ease);
}

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

.page-faq .qa__sum:hover,
.page-faq .qa[open] .qa__sum {
  color: var(--lime);
}

.page-faq .qa__sum:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: -2px;
}

.page-faq .qa__num {
  flex: none;
  padding-block-start: 2px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--mist);
  letter-spacing: 0.05em;
}

.page-faq .qa[open] .qa__num {
  color: var(--lime);
}

.page-faq .qa__q {
  flex: 1 1 auto;
}

.page-faq .qa__mark {
  position: relative;
  flex: none;
  width: 14px;
  height: 14px;
  margin-block-start: 4px;
}

.page-faq .qa__mark::before,
.page-faq .qa__mark::after {
  content: "";
  position: absolute;
  inset-block-start: 50%;
  inset-inline-start: 50%;
  background: var(--lime);
  transform: translate(-50%, -50%);
  transition: transform 0.22s var(--ease), opacity 0.22s var(--ease);
}

.page-faq .qa__mark::before {
  width: 14px;
  height: 2px;
}

.page-faq .qa__mark::after {
  width: 2px;
  height: 14px;
}

.page-faq .qa[open] .qa__mark::after {
  transform: translate(-50%, -50%) scaleY(0);
}

.page-faq .qa__body {
  padding: 0 clamp(14px, 1.8vw, 20px) clamp(14px, 1.8vw, 20px)
    calc(clamp(14px, 1.8vw, 20px) + var(--faq-num-w));
  color: var(--silver);
  font-size: 14.5px;
  line-height: 1.68;
}

.page-faq .qa__body p {
  margin: 0 0 0.85em;
}

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

.page-faq .qa__body a {
  color: var(--lime);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-faq .qa__steps {
  margin: 0.5em 0 0.9em;
  padding: 0;
  list-style: none;
  counter-reset: step;
  display: grid;
  gap: 9px;
}

.page-faq .qa__steps li {
  position: relative;
  counter-increment: step;
  padding-inline-start: var(--faq-num-w);
  font-size: 14.5px;
  color: var(--silver);
}

.page-faq .qa__steps li::before {
  content: counter(step, decimal-leading-zero);
  position: absolute;
  inset-inline-start: 0;
  inset-block-start: 1px;
  padding: 1px 4px;
  border: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 10px;
  line-height: 1.3;
  color: var(--lime);
}

/* ---------- 数据注释 ---------- */
.page-faq .faq-stat {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 14px;
  margin-block: 0 clamp(16px, 2vw, 22px);
  padding: 12px 14px;
  border-left: 3px solid var(--pulse);
  background: rgba(53, 167, 255, 0.08);
  font-size: 13px;
  line-height: 1.55;
  color: var(--silver);
}

.page-faq .faq-stat__num {
  font-family: var(--font-mono);
  font-size: 24px;
  font-weight: 600;
  color: var(--pulse);
  letter-spacing: -0.01em;
}

/* ---------- 图版 ---------- */
.page-faq .faq-figure {
  margin: 0 0 clamp(18px, 2.4vw, 26px);
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 2px solid var(--line);
  background: var(--panel);
}

.page-faq .faq-figure .media-frame__caption {
  margin-block-start: 8px;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  line-height: 1.5;
  color: var(--mist);
  letter-spacing: 0.02em;
}

/* ---------- 故障排查 ---------- */
.page-faq .trouble-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 2.6vw, 32px);
}

.page-faq .trouble-grid__body {
  min-width: 0;
}

/* ---------- 联系 ---------- */
.page-faq .help-cards {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-faq .help-card {
  padding: clamp(16px, 2vw, 24px);
  border: 2px solid var(--line);
  background: var(--panel);
}

.page-faq .help-card--primary {
  border-color: var(--lime);
  background: linear-gradient(152deg, rgba(200, 255, 61, 0.14), var(--panel) 64%);
}

.page-faq .help-card h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 18px;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-faq .help-card p {
  margin: 0 0 14px;
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--silver);
}

.page-faq .help-card .btn {
  margin-block-start: 2px;
}

.page-faq .help-contact {
  margin: 0 0 12px;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 9px;
}

.page-faq .help-contact li {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 12px;
  align-items: baseline;
  font-size: 13.5px;
  color: var(--silver);
  overflow-wrap: anywhere;
}

.page-faq .help-contact__k {
  flex: none;
  min-width: 34px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.page-faq .help-contact a {
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid var(--lime-deep);
}

.page-faq .help-contact a:hover,
.page-faq .help-contact a:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--paper);
}

.page-faq .help-card__note {
  margin: 0;
  padding-inline-start: 10px;
  border-left: 2px dashed var(--line);
  font-size: 12.5px;
  color: var(--mist);
}

.page-faq .faq-tail {
  margin: clamp(18px, 2.4vw, 26px) 0 0;
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--mist);
}

.page-faq .faq-tail a {
  color: var(--silver);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-faq .faq-tail a:hover,
.page-faq .faq-tail a:focus-visible {
  color: var(--lime);
}

/* ---------- 响应式 ---------- */
@media (min-width: 680px) {
  .page-faq .help-cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-faq .trouble-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.68fr);
    align-items: start;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero {
    grid-template-columns: minmax(0, 1.06fr) minmax(300px, 0.62fr);
    align-items: start;
  }

  .page-faq .faq-hero__lead {
    padding-block-start: 6px;
  }

  .page-faq .topbar-demo {
    margin-inline: 0 auto;
  }
}

@media (min-width: 980px) {
  .page-faq .faq-layout {
    grid-template-columns: minmax(196px, 248px) minmax(0, 1fr);
    align-items: start;
  }

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

  .page-faq .faq-rail__card {
    margin-block-start: 28px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .topbar-demo__tip,
  .page-faq .qa__mark::before,
  .page-faq .qa__mark::after,
  .page-faq .qa,
  .page-faq .topbar-demo {
    transition: none;
  }
}
<<<END>>>