/* ============================================================
   帮助中心 · 页面专属样式
   作用域：.page-faq
   ============================================================ */

.page-faq {
  --faq-track-w: 224px;
  --faq-gap: 52px;
  --faq-rule: rgba(11, 42, 74, .14);
  --faq-surface: #FCFAF6;
  background: var(--sand);
  color: var(--ink);
  font-family: var(--font-body);
  padding-bottom: 40px;
}

.page-faq img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* ---------- 页头 ---------- */

.page-faq .breadcrumb {
  margin: 26px 0 22px;
}

.page-faq .faq-head {
  max-width: 780px;
  padding-bottom: 44px;
}

.page-faq .faq-head h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.9rem, 5.4vw, 3.4rem);
  line-height: 1.18;
  letter-spacing: -0.015em;
  color: var(--deep);
  margin: 14px 0 18px;
}

.page-faq .faq-head .lede {
  font-size: 17px;
  line-height: 1.85;
  color: var(--ink);
  margin: 0 0 16px;
  max-width: 62ch;
}

.page-faq .faq-head .note {
  margin: 0;
  padding-left: 14px;
  border-left: 2px solid var(--line-gold);
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--slate);
  max-width: 58ch;
}

/* ---------- 三步核对顺序带 ---------- */

.page-faq .faq-steps {
  padding: 4px 0 60px;
}

.page-faq .faq-steps__title {
  font-family: var(--font-mono);
  font-weight: 400;
  font-size: 12.5px;
  letter-spacing: .16em;
  color: var(--slate);
  margin: 0 0 18px;
}

.page-faq .steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  counter-reset: faqstep;
}

.page-faq .step {
  counter-increment: faqstep;
  position: relative;
  padding: 22px 0 24px 58px;
  border-top: 1px solid var(--faq-rule);
}

.page-faq .step:last-child {
  border-bottom: 1px solid var(--faq-rule);
}

.page-faq .step::before {
  content: "0" counter(faqstep);
  position: absolute;
  left: 0;
  top: 24px;
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--deep);
}

.page-faq .step__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  line-height: 1.5;
  color: var(--deep);
  margin: 0 0 8px;
}

.page-faq .step__body {
  margin: 0;
  font-size: 15px;
  line-height: 1.82;
  color: var(--slate);
  max-width: 46ch;
}

/* ---------- 双列骨架 ---------- */

.page-faq .faq-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
  padding-bottom: 24px;
}

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

.page-faq .faq-track__label {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .16em;
  color: var(--slate);
  margin: 0 0 10px;
}

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

.page-faq .faq-track__item {
  flex: 0 0 auto;
}

.page-faq .faq-track__link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 14px;
  border: 1px solid var(--faq-rule);
  border-radius: 8px;
  background: var(--faq-surface);
  color: var(--deep);
  font-size: 13.5px;
  line-height: 1.5;
  text-decoration: none;
  white-space: nowrap;
  transition: border-color .2s ease-out, background-color .2s ease-out, color .2s ease-out;
}

.page-faq .faq-track__link:hover {
  border-color: var(--line-gold);
  background: #FFFFFF;
}

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

.page-faq .faq-track__num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--slate);
}

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

/* ---------- 章节通用 ---------- */

.page-faq .faq-section {
  padding: 40px 0;
  border-top: 1px solid var(--faq-rule);
  scroll-margin-top: calc(var(--masthead-h) + 32px);
}

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

.page-faq .faq-section > .faq-section__num {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .14em;
  color: var(--slate);
  margin: 0 0 12px;
  max-width: none;
}

.page-faq .faq-section h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.4rem, 3.6vw, 2rem);
  line-height: 1.28;
  letter-spacing: -0.01em;
  color: var(--deep);
  margin: 0 0 20px;
}

.page-faq .faq-section h2::after {
  content: "";
  display: block;
  width: 40px;
  height: 4px;
  margin-top: 14px;
  background: linear-gradient(90deg, var(--gold), var(--gold-soft));
  clip-path: polygon(0 0, 100% 0, calc(100% - 7px) 100%, 0 100%);
}

.page-faq .faq-section > p {
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink);
  margin: 0 0 15px;
  max-width: 66ch;
}

.page-faq .faq-section > h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
  line-height: 1.5;
  color: var(--deep);
  margin: 32px 0 14px;
}

/* ---------- 分组 chip 跳转 ---------- */

.page-faq .spec-chips {
  margin: 4px 0 28px;
  flex-wrap: wrap;
}

.page-faq .spec-chips .chip {
  text-decoration: none;
  white-space: nowrap;
}

/* ---------- 图文分栏 ---------- */

.page-faq .split {
  display: grid;
  gap: 26px;
  margin-bottom: 8px;
}

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

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

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

.page-faq .figure__frame {
  overflow: hidden;
  border-radius: 8px;
  border: 1px solid var(--faq-rule);
  background: var(--deep);
}

.page-faq .figure__cap {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--slate);
}

/* ---------- 参数分组列表 ---------- */

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

.page-faq .group {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 0 12px;
  padding: 18px 0;
  border-top: 1px solid var(--faq-rule);
  scroll-margin-top: calc(var(--masthead-h) + 32px);
}

.page-faq .group:last-child {
  border-bottom: 1px solid var(--faq-rule);
}

.page-faq .group__code {
  grid-row: 1 / span 2;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: -0.02em;
  color: var(--deep);
  padding-top: 3px;
  opacity: .72;
}

.page-faq .faq-section .group .group__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 15.5px;
  line-height: 1.5;
  color: var(--deep);
  margin: 0 0 5px;
}

.page-faq .faq-section .group .group__desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--slate);
  max-width: 54ch;
}

/* ---------- 标记图例 ---------- */

.page-faq .legend {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-faq .legend__item {
  display: grid;
  grid-template-columns: 6px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
}

.page-faq .legend__mark {
  width: 6px;
  height: 24px;
  margin-top: 3px;
  border-radius: 2px;
}

.page-faq .legend__mark--gold {
  background: linear-gradient(180deg, var(--gold), var(--gold-soft));
}

.page-faq .legend__mark--red {
  background: var(--red);
}

.page-faq .legend__mark--plain {
  background: var(--faq-rule);
}

.page-faq .legend__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 15px;
  line-height: 1.5;
  color: var(--deep);
  margin: 0 0 3px;
}

.page-faq .legend__desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--slate);
  max-width: 56ch;
}

/* ---------- 复制块 ---------- */

.page-faq .copy-block {
  margin-top: 28px;
  padding: 20px 22px 22px;
  border: 1px solid var(--line-gold);
  border-radius: 8px;
  background: linear-gradient(135deg, rgba(212, 160, 23, .09), rgba(232, 196, 106, .02));
}

.page-faq .copy-block__label {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 14px;
  line-height: 1.6;
  color: var(--deep);
  margin: 0 0 12px;
  max-width: 52ch;
}

.page-faq .copy-btn {
  display: inline-flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  padding: 11px 15px;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  background: var(--linen);
  color: var(--deep);
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.7;
  text-align: left;
  cursor: pointer;
  transition: border-color .2s ease-out, background-color .2s ease-out;
}

.page-faq .copy-btn:hover {
  border-color: var(--gold);
  background: #FFFFFF;
}

.page-faq .copy-btn:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 2px;
}

.page-faq .copy-btn__hint {
  font-size: 12px;
  color: var(--moss);
}

/* ---------- 变更类型 ---------- */

.page-faq .vtypes {
  list-style: none;
  margin: 0 0 30px;
  padding: 0;
}

.page-faq .vtype {
  padding: 16px 0;
  border-top: 1px solid var(--faq-rule);
}

.page-faq .vtype:last-child {
  border-bottom: 1px solid var(--faq-rule);
}

.page-faq .faq-section .vtype .vtype__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 15.5px;
  line-height: 1.5;
  color: var(--deep);
  margin: 0 0 5px;
}

.page-faq .faq-section .vtype .vtype__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.82;
  color: var(--slate);
  max-width: 60ch;
}

/* ---------- 追溯步骤 ---------- */

.page-faq .trace {
  list-style: none;
  margin: 0 0 20px;
  padding: 0;
  counter-reset: trace;
}

.page-faq .trace__step {
  counter-increment: trace;
  position: relative;
  padding: 14px 0 14px 44px;
  border-top: 1px solid var(--faq-rule);
  font-size: 15px;
  line-height: 1.82;
  color: var(--ink);
}

.page-faq .trace__step:last-child {
  border-bottom: 1px solid var(--faq-rule);
}

.page-faq .trace__step::before {
  content: counter(trace);
  position: absolute;
  left: 0;
  top: 16px;
  width: 24px;
  height: 24px;
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--deep);
  border: 1px solid var(--line-gold);
  border-radius: 4px;
}

/* ---------- 数据表 ---------- */

.page-faq .data-table {
  font-size: 14.5px;
}

.page-faq .data-table caption {
  text-align: left;
  font-size: 12.5px;
  color: var(--slate);
  padding-bottom: 12px;
}

.page-faq .data-table th,
.page-faq .data-table td {
  line-height: 1.7;
}

/* ---------- 折叠问答 ---------- */

.page-faq .qa-list {
  margin-top: 4px;
}

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

.page-faq .qa:last-child {
  border-bottom: 1px solid var(--faq-rule);
}

.page-faq .qa__q {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 17px 4px;
  list-style: none;
  cursor: pointer;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 15.5px;
  line-height: 1.66;
  color: var(--deep);
  transition: color .18s ease-out;
}

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

.page-faq .qa__q:hover {
  color: var(--ridge);
}

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

.page-faq .qa__q::after {
  content: "";
  flex: 0 0 auto;
  width: 11px;
  height: 11px;
  margin-left: auto;
  margin-top: 7px;
  border-right: 2px solid var(--gold);
  border-bottom: 2px solid var(--gold);
  transform: rotate(45deg);
  transition: transform .2s ease-out, margin-top .2s ease-out;
}

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

.page-faq .qa[open] .qa__q::after {
  transform: rotate(-135deg);
  margin-top: 12px;
}

.page-faq .qa__body {
  padding: 0 4px 22px;
  max-width: 66ch;
}

.page-faq .qa__body p {
  margin: 0 0 10px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--slate);
}

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

.page-faq .qa__body a {
  color: var(--ridge);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.page-faq .qa__body a:hover {
  color: var(--deep);
}

/* ---------- 收尾块 ---------- */

.page-faq .faq-outro {
  position: relative;
  margin-top: 12px;
  padding: 30px 26px 30px 32px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--linen);
  overflow: hidden;
}

.page-faq .faq-outro::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 5px;
  background: linear-gradient(180deg, var(--gold), var(--gold-soft));
}

.page-faq .faq-outro h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.35rem;
  line-height: 1.35;
  color: var(--deep);
  margin: 0 0 12px;
}

.page-faq .faq-outro p {
  margin: 0 0 20px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--slate);
  max-width: 62ch;
}

.page-faq .faq-outro .cluster {
  flex-wrap: wrap;
}

/* ---------- 桌面端 ---------- */

@media (min-width: 760px) {
  .page-faq .steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0;
  }

  .page-faq .step {
    padding: 26px 26px 30px 58px;
    border-top: 1px solid var(--faq-rule);
    border-bottom: 1px solid var(--faq-rule);
    border-right: 1px solid var(--faq-rule);
  }

  .page-faq .step:first-child {
    border-left: 1px solid var(--faq-rule);
  }

  .page-faq .step::before {
    left: 24px;
    top: 28px;
  }

  .page-faq .step__body {
    max-width: none;
  }
}

@media (min-width: 980px) {
  .page-faq .faq-body {
    grid-template-columns: var(--faq-track-w) minmax(0, 1fr);
    gap: var(--faq-gap);
    align-items: start;
  }

  .page-faq .faq-track {
    position: sticky;
    top: calc(var(--masthead-h) + 28px);
  }

  .page-faq .faq-track__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
    border-left: 1px solid var(--faq-rule);
  }

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

  .page-faq .faq-track__link {
    margin-left: -1px;
    padding: 11px 12px 11px 16px;
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    background: transparent;
    white-space: normal;
    font-size: 13.5px;
  }

  .page-faq .faq-track__link:hover {
    border-left-color: var(--line-gold);
    background: rgba(11, 42, 74, .05);
  }

  .page-faq .faq-section {
    padding: 48px 0;
  }
}

@media (min-width: 1180px) {
  .page-faq .split {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
    gap: 40px;
    align-items: start;
  }
}

@media (min-width: 1320px) {
  .page-faq {
    --faq-track-w: 248px;
  }
}

/* ---------- 降低动效偏好 ---------- */

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-track__link,
  .page-faq .copy-btn,
  .page-faq .qa__q,
  .page-faq .qa__q::after {
    transition: none;
  }
}
<<<END>>>