.page-faq {
  --faq-rail: 296px;
  --faq-gap: 56px;
  --faq-cut: 14px;
  --faq-sticky-top: calc(var(--header-h) + 20px);
  display: block;
  background: var(--ink);
  color: var(--paper);
}

/* ---------- 面包屑 ---------- */
.page-faq .faq-crumbs {
  padding-top: 22px;
}

/* ---------- 首屏框景 ---------- */
.page-faq .faq-hero {
  padding-top: 16px;
}

.page-faq .faq-frame {
  position: relative;
  border: 1px solid var(--line-strong);
  background:
    radial-gradient(120% 90% at 88% 8%, rgba(198, 242, 74, 0.09), transparent 58%),
    linear-gradient(158deg, var(--ink-2) 0%, var(--ink) 64%);
  padding: 24px 18px 26px;
}

.page-faq .faq-hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
  align-items: start;
  margin-top: 16px;
  min-width: 0;
}

.page-faq .faq-hero-copy {
  min-width: 0;
}

.page-faq .faq-hero h1 {
  font-family: var(--font-head);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.05;
  font-size: clamp(28px, 7.4vw, 58px);
  margin: 14px 0 16px;
  color: var(--paper);
}

.page-faq .faq-hero .lede {
  margin: 0;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.65;
  color: var(--mute);
}

.page-faq .faq-hero-points {
  list-style: none;
  margin: 26px 0 0;
  padding: 18px 0 0;
  border-top: 1px solid var(--line);
  display: grid;
  gap: 12px;
}

.page-faq .faq-hero-points li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  font-size: 14px;
  line-height: 1.5;
  color: var(--mute);
}

.page-faq .faq-point-num {
  font-size: 20px;
  line-height: 1;
  color: var(--lime);
  letter-spacing: 0.02em;
}

.page-faq .faq-hero-media {
  margin: 0;
  position: relative;
  min-width: 0;
}

.page-faq .faq-hero-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
  border: 1px solid var(--line-strong);
}

.page-faq .media-caption {
  margin-top: 10px;
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mute);
}

/* ---------- 筛选胶囊条 ---------- */
.page-faq .faq-filter {
  margin-top: 22px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: var(--ink-2);
}

.page-faq .faq-filter-label {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--mute);
}

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

.page-faq .faq-chips .chip {
  display: inline-block;
  padding: 8px 15px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-pill);
  color: var(--paper);
  text-decoration: none;
  font-size: 13px;
  letter-spacing: 0.04em;
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.page-faq .faq-chips .chip:hover,
.page-faq .faq-chips .chip:focus-visible {
  border-color: var(--lime);
  color: var(--lime);
  background: rgba(198, 242, 74, 0.08);
}

/* ---------- 主体：左索引 + 右问答 ---------- */
.page-faq .faq-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: 30px;
  padding-top: 34px;
  padding-bottom: 72px;
  min-width: 0;
}

.page-faq .faq-rail {
  min-width: 0;
  border-top: 1px solid var(--line-strong);
  padding-top: 14px;
}

.page-faq .faq-rail-title {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--mute);
}

.page-faq .faq-rail-list {
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

.page-faq .faq-rail-list::-webkit-scrollbar {
  display: none;
}

.page-faq .faq-rail-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 15px;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  color: var(--paper);
  text-decoration: none;
  font-size: 13px;
  white-space: nowrap;
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.page-faq .faq-rail-num {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--orange);
}

.page-faq .faq-rail-link:hover,
.page-faq .faq-rail-link:focus-visible {
  border-color: var(--line-lime);
  color: var(--lime);
}

.page-faq .faq-rail-link.is-active {
  border-color: var(--lime);
  background: rgba(198, 242, 74, 0.12);
  color: var(--lime);
}

.page-faq .faq-rail-link.is-active .faq-rail-num {
  color: var(--lime);
}

.page-faq .faq-main {
  min-width: 0;
  display: grid;
  gap: 0;
}

/* ---------- 分组 ---------- */
.page-faq .faq-group {
  scroll-margin-top: var(--faq-sticky-top);
  padding-top: 34px;
  margin-top: 34px;
  border-top: 1px solid var(--line);
}

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

.page-faq .faq-group-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 6px 14px;
  align-items: baseline;
  margin-bottom: 20px;
}

.page-faq .faq-group-num {
  font-size: 26px;
  line-height: 1;
  color: var(--lime);
  letter-spacing: -0.02em;
}

.page-faq .faq-group-head .section-title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.15;
  font-size: clamp(21px, 4.4vw, 30px);
  color: var(--paper);
}

.page-faq .faq-group-lede {
  grid-column: 1 / -1;
  margin: 4px 0 0;
  max-width: 60ch;
  font-size: 14px;
  line-height: 1.65;
  color: var(--mute);
}

/* ---------- 折叠问答 ---------- */
.page-faq .faq-folds {
  display: grid;
  gap: 10px;
}

.page-faq .faq-fold {
  border: 1px solid var(--line);
  background: var(--ink-2);
  clip-path: polygon(0 0, calc(100% - var(--faq-cut)) 0, 100% var(--faq-cut), 100% 100%, 0 100%);
  transition: background-color 0.24s var(--ease), border-color 0.24s var(--ease), box-shadow 0.24s var(--ease);
}

.page-faq .faq-fold:hover {
  border-color: var(--line-lime);
}

.page-faq .faq-fold[open] {
  background: var(--ink-3);
  border-color: var(--line-lime);
  box-shadow: inset 3px 0 0 0 var(--lime);
}

.page-faq .fold-summary {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 17px 20px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 15px;
  line-height: 1.45;
  letter-spacing: -0.005em;
  color: var(--paper);
}

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

.page-faq .fold-summary::after {
  content: "+";
  margin-left: auto;
  flex: none;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1.1;
  color: var(--lime);
}

.page-faq .faq-fold[open] .fold-summary::after {
  content: "–";
}

.page-faq .faq-fold[open] .fold-summary {
  border-bottom: 1px solid var(--line);
  color: var(--lime);
}

.page-faq .fold-body {
  padding: 16px 20px 20px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--paper);
}

.page-faq .fold-body p {
  margin: 0;
  max-width: 62ch;
  color: var(--mute);
}

.page-faq .fold-body p + ol {
  margin-top: 14px;
}

.page-faq .faq-inline-link {
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid var(--line-lime);
}

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

/* ---------- 步骤编号 ---------- */
.page-faq .faq-steps {
  list-style: none;
  margin: 13px 0 0;
  padding: 0;
  display: grid;
  gap: 11px;
}

.page-faq .faq-steps li {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  font-size: 14px;
  line-height: 1.65;
  color: var(--mute);
}

.page-faq .faq-step-num {
  font-size: 20px;
  line-height: 1;
  color: var(--lime);
  border-right: 1px solid var(--line-lime);
  padding-right: 8px;
  text-align: right;
}

/* ---------- 换设备配图 ---------- */
.page-faq .faq-device-media {
  margin: 0 0 18px;
  min-width: 0;
}

.page-faq .faq-device-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border: 1px solid var(--line-strong);
}

/* ---------- 联系卡 ---------- */
.page-faq .faq-contact-card {
  border: 1px solid var(--line-strong);
  background: linear-gradient(150deg, var(--ink-3) 0%, var(--ink-2) 100%);
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 0 100%);
  padding: 22px 18px;
}

.page-faq .faq-contact-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.page-faq .faq-contact-key {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--orange);
}

.page-faq .faq-contact-value {
  margin: 0;
  font-size: 15px;
  line-height: 1.5;
  color: var(--paper);
  overflow-wrap: anywhere;
}

.page-faq .faq-contact-sub {
  margin: 6px 0 0;
  font-size: 13px;
  line-height: 1.5;
  color: var(--mute);
}

.page-faq .faq-contact-ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 7px;
}

.page-faq .faq-contact-ul li {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--mute);
}

.page-faq .faq-contact-ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 7px;
  height: 7px;
  background: var(--lime);
  clip-path: polygon(0 0, 100% 0, 100% 100%);
}

.page-faq .faq-contact-note {
  margin: 22px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  line-height: 1.7;
  color: var(--mute);
}

/* ---------- 平板 ---------- */
@media (min-width: 768px) {
  .page-faq .faq-frame {
    padding: 34px 30px 36px;
  }

  .page-faq .faq-hero-grid {
    gap: 32px;
    margin-top: 22px;
  }

  .page-faq .faq-hero .lede {
    font-size: 16px;
  }

  .page-faq .faq-filter {
    flex-direction: row;
    align-items: center;
    gap: 16px;
    padding: 10px 18px;
    border-radius: var(--radius-pill);
  }

  .page-faq .faq-filter-label {
    flex: none;
    padding-right: 16px;
    border-right: 1px solid var(--line);
  }

  .page-faq .faq-body {
    padding-top: 44px;
    padding-bottom: 88px;
  }

  .page-faq .fold-summary {
    font-size: 16px;
    padding: 19px 24px;
  }

  .page-faq .fold-body {
    padding: 18px 24px 22px;
    font-size: 15px;
  }

  .page-faq .faq-steps li {
    grid-template-columns: 36px minmax(0, 1fr);
    gap: 16px;
    font-size: 15px;
  }

  .page-faq .faq-step-num {
    font-size: 24px;
  }

  .page-faq .faq-contact-card {
    padding: 30px 28px;
  }

  .page-faq .faq-contact-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 26px 32px;
  }

  .page-faq .faq-contact-item:first-child {
    grid-column: 1 / -1;
  }
}

/* ---------- 桌面：左轨右瀑 ---------- */
@media (min-width: 1024px) {
  .page-faq .faq-frame {
    padding: 48px 44px 50px;
  }

  .page-faq .faq-hero-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 52px;
    margin-top: 26px;
  }

  .page-faq .faq-hero-points {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }

  .page-faq .faq-hero-points li {
    grid-template-columns: 1fr;
    gap: 6px;
  }

  .page-faq .faq-body {
    grid-template-columns: var(--faq-rail) minmax(0, 1fr);
    gap: var(--faq-gap);
    padding-top: 52px;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: var(--faq-sticky-top);
    align-self: start;
    border-top: 0;
    border-left: 1px solid var(--line-strong);
    padding-top: 0;
    padding-left: 0;
  }

  .page-faq .faq-rail-title {
    padding-left: 16px;
  }

  .page-faq .faq-rail-list {
    display: block;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-faq .faq-rail-link {
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    padding: 12px 12px 12px 14px;
    white-space: normal;
    align-items: baseline;
    transition: border-color 0.2s var(--ease), color 0.2s var(--ease), background-color 0.2s var(--ease);
  }

  .page-faq .faq-rail-link.is-active {
    border-left-color: var(--lime);
    background: rgba(198, 242, 74, 0.08);
  }

  .page-faq .faq-rail-num {
    font-size: 13px;
  }

  .page-faq .faq-group {
    scroll-margin-top: calc(var(--faq-sticky-top) + 24px);
    padding-top: 44px;
    margin-top: 44px;
  }

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

  .page-faq .faq-group-num {
    font-size: 34px;
  }

  .page-faq .faq-device-media {
    margin-bottom: 24px;
  }

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

  .page-faq .faq-contact-item:first-child {
    grid-column: 1 / -1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-fold,
  .page-faq .faq-chips .chip,
  .page-faq .faq-rail-link {
    transition: opacity 0.2s linear;
  }
}
<<<END>>>