.page-faq {
  --faq-rail-w: 44px;
  --faq-step-gap: 16px;
  display: block;
  padding-bottom: clamp(48px, 8vw, 88px);
  background: var(--ink);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  padding-top: clamp(24px, 4vw, 48px);
  padding-bottom: clamp(28px, 5vw, 52px);
}

.page-faq .faq-hero__grid {
  margin-top: 26px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
}

.page-faq .faq-hero__rail {
  display: none;
}

.page-faq .faq-hero__vnote {
  display: block;
  writing-mode: vertical-rl;
  text-orientation: mixed;
  letter-spacing: 0.22em;
  font-size: 12px;
  color: var(--dim);
  border-left: 1px solid var(--line);
  padding: 8px 0 8px 10px;
  margin: 0;
  white-space: nowrap;
}

.page-faq .faq-hero__title {
  margin: 0 0 18px;
  font-size: clamp(30px, 6.2vw, 62px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  font-weight: 900;
  color: var(--title);
  max-width: 20ch;
}

.page-faq .faq-hero__lead {
  margin: 0 0 26px;
  max-width: 44ch;
  font-size: 16.5px;
  line-height: 1.9;
  color: var(--body);
}

.page-faq .faq-hero__toc {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 10px;
}

.page-faq .faq-hero__toc a {
  display: inline-block;
  font-size: 13px;
  letter-spacing: 0.04em;
  padding: 7px 13px;
  border: 1px solid var(--line);
  color: var(--dim);
  text-decoration: none;
  background: rgba(33, 243, 200, 0.04);
  transition: color 0.18s var(--ease-hard), border-color 0.18s var(--ease-hard), background-color 0.18s var(--ease-hard);
}

.page-faq .faq-hero__toc a:hover,
.page-faq .faq-hero__toc a:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan);
  background: rgba(33, 243, 200, 0.1);
}

/* ---------- 章节通用 ---------- */
.page-faq .faq-sec {
  padding-top: clamp(34px, 5.5vw, 60px);
  padding-bottom: clamp(20px, 3vw, 34px);
  border-top: 1px solid var(--line);
}

.page-faq .faq-head {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 12px 14px;
}

.page-faq .faq-head__title {
  margin: 0;
  font-size: clamp(22px, 3.6vw, 34px);
  line-height: 1.22;
  letter-spacing: -0.015em;
  color: var(--title);
}

.page-faq .faq-lead {
  margin: 14px 0 0;
  max-width: 54ch;
  font-size: 16px;
  line-height: 1.9;
  color: var(--body);
}

.page-faq .faq-note {
  margin: 26px 0 0;
  max-width: 62ch;
  font-size: 14.5px;
  line-height: 1.9;
  color: var(--dim);
}

.page-faq .faq-note a,
.page-faq .faq-tip a,
.page-faq .fix__more a,
.page-faq .qa__a a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(33, 243, 200, 0.35);
}

.page-faq .faq-note a:hover,
.page-faq .fix__more a:hover,
.page-faq .qa__a a:hover,
.page-faq .faq-note a:focus-visible,
.page-faq .fix__more a:focus-visible,
.page-faq .qa__a a:focus-visible {
  border-bottom-color: var(--cyan);
}

/* ---------- 01 步骤 ---------- */
.page-faq .steps {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  counter-reset: faq-step;
}

.page-faq .step {
  position: relative;
  display: grid;
  grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
  gap: 0 var(--faq-step-gap);
  padding-bottom: 16px;
}

.page-faq .step::before {
  content: "";
  position: absolute;
  left: calc(var(--faq-rail-w) / 2);
  top: 52px;
  bottom: 2px;
  width: 1px;
  background: linear-gradient(180deg, rgba(33, 243, 200, 0.35), rgba(31, 74, 61, 0.1));
}

.page-faq .step:last-child {
  padding-bottom: 0;
}

.page-faq .step:last-child::before {
  content: none;
}

.page-faq .step__no {
  grid-column: 1;
  align-self: start;
  width: var(--faq-rail-w);
  height: var(--faq-rail-w);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 14px;
  letter-spacing: 0.04em;
  color: var(--cyan);
  border: 1px solid rgba(33, 243, 200, 0.42);
  background: rgba(33, 243, 200, 0.07);
}

.page-faq .step__fold {
  grid-column: 2;
  min-width: 0;
}

.page-faq .step__head {
  width: 100%;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 0 12px;
  background: none;
  border: 0;
  border-bottom: 1px solid var(--line);
  text-align: left;
  cursor: pointer;
}

.page-faq .step__title {
  font-size: clamp(16.5px, 2vw, 20px);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--title);
}

.page-faq .step__hint {
  flex: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--dim);
  white-space: nowrap;
}

.page-faq .step__body {
  padding: 12px 0 6px;
}

.page-faq .step__body p {
  margin: 0 0 9px;
  max-width: 48ch;
  font-size: 15.5px;
  line-height: 1.88;
  color: var(--body);
}

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

/* ---------- 02 两步路径 ---------- */
.page-faq .faq-figure {
  margin: 26px 0 0;
  border: 1px solid var(--line);
  background: var(--ink-2);
  overflow: hidden;
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.72) brightness(0.92);
}

.page-faq .faq-figure figcaption {
  padding: 12px 16px;
  font-size: 13px;
  line-height: 1.75;
  color: var(--dim);
  border-top: 1px solid var(--line);
}

.page-faq .path {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: stretch;
  gap: 12px;
}

.page-faq .path__step {
  flex: 1 1 220px;
  min-width: 0;
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 16px 18px;
  background: var(--card);
  border-left: 2px solid var(--cyan);
}

.page-faq .path__no {
  flex: none;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  line-height: 1.4;
  color: var(--cyan);
  border: 1px solid rgba(33, 243, 200, 0.4);
  padding: 1px 7px;
}

.page-faq .path__text {
  display: block;
  min-width: 0;
}

.page-faq .path__text strong {
  display: block;
  margin-bottom: 4px;
  font-size: 16px;
  color: var(--title);
}

.page-faq .path__text span {
  display: block;
  font-size: 14px;
  line-height: 1.7;
  color: var(--dim);
}

.page-faq .path__arrow {
  display: none;
  align-items: center;
  color: var(--line);
}

.page-faq .faq-tip {
  margin-top: 22px;
  padding: 18px 20px;
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  gap: 10px 14px;
}

.page-faq .faq-tip p {
  margin: 0;
  flex: 1 1 260px;
  min-width: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--body);
}

/* ---------- 03 指标 ---------- */
.page-faq .metrics-layout {
  margin-top: 28px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
}

.page-faq .fields {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
}

.page-faq .field {
  padding: 12px 0 13px;
  border-bottom: 1px solid var(--line);
}

.page-faq .field__name {
  display: block;
  margin-bottom: 5px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--cyan);
}

.page-faq .field--key .field__name {
  color: var(--orange);
}

.page-faq .field__note {
  display: block;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--body);
}

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

/* ---------- 04 时间轴 ---------- */
.page-faq .timeline {
  list-style: none;
  margin: 28px 0 0;
  padding: 0 0 0 26px;
  position: relative;
}

.page-faq .timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, rgba(33, 243, 200, 0.6), rgba(31, 74, 61, 0.25));
}

.page-faq .timeline__item {
  position: relative;
  padding-bottom: 24px;
}

.page-faq .timeline__item:last-child {
  padding-bottom: 0;
}

.page-faq .timeline__dot {
  position: absolute;
  left: -26px;
  top: 5px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink);
  border: 1px solid var(--cyan);
  box-shadow: 0 0 0 4px rgba(33, 243, 200, 0.1);
}

.page-faq .timeline__code {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--orange);
}

.page-faq .timeline__title {
  margin: 0 0 6px;
  font-size: 18px;
  line-height: 1.4;
  color: var(--title);
}

.page-faq .timeline__body p {
  margin: 0;
  max-width: 54ch;
  font-size: 15px;
  line-height: 1.88;
  color: var(--body);
}

/* ---------- 05 纠错 ---------- */
.page-faq .fix {
  margin-top: 26px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
}

.page-faq .fix__title {
  margin: 0 0 14px;
  font-size: 17px;
  line-height: 1.4;
  color: var(--title);
}

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

.page-faq .fix__list li {
  position: relative;
  padding: 9px 0 9px 20px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--body);
  border-bottom: 1px solid var(--line);
}

.page-faq .fix__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 18px;
  width: 8px;
  height: 1px;
  background: var(--cyan);
}

.page-faq .fix__list li:last-child {
  border-bottom: 0;
}

.page-faq .fix__panel {
  padding: 20px 20px 22px;
}

.page-faq .fix__meta {
  margin: 0 0 16px;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 8px 18px;
}

.page-faq .fix__meta dt {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--dim);
  padding-top: 3px;
  white-space: nowrap;
}

.page-faq .fix__meta dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.6;
  color: var(--title);
  word-break: break-word;
}

.page-faq .fix__panel p {
  margin: 0 0 10px;
  max-width: 48ch;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--body);
}

.page-faq .fix__more {
  margin-bottom: 0;
  color: var(--dim);
}

/* ---------- 06 问答 ---------- */
.page-faq .qa {
  margin-top: 24px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  border-top: 1px solid var(--line);
}

.page-faq .qa__item {
  border-bottom: 1px solid var(--line);
}

.page-faq .qa__q {
  width: 100%;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 14px;
  padding: 16px 0;
  background: none;
  border: 0;
  text-align: left;
  cursor: pointer;
  color: var(--title);
  font-size: 16px;
  line-height: 1.65;
  font-weight: 600;
}

.page-faq .qa__q::after {
  content: "+";
  flex: none;
  font-family: var(--font-mono);
  font-size: 17px;
  line-height: 1.5;
  color: var(--cyan);
}

.page-faq .qa__q[aria-expanded="true"]::after {
  content: "−";
}

.page-faq .qa__a {
  padding: 0 0 18px;
}

.page-faq .qa__a p {
  margin: 0;
  max-width: 52ch;
  font-size: 15px;
  line-height: 1.88;
  color: var(--body);
}

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

.page-faq .faq-note--end {
  margin-top: 28px;
}

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

  .page-faq .field {
    padding-right: 18px;
  }

  .page-faq .field:nth-child(odd) {
    border-right: 1px solid var(--line);
  }

  .page-faq .field:nth-child(even) {
    padding-left: 18px;
    padding-right: 0;
  }

  .page-faq .fix {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    align-items: start;
  }
}

@media (min-width: 760px) {
  .page-faq .path__arrow {
    display: flex;
  }
}

@media (min-width: 860px) {
  .page-faq .qa {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 40px;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 980px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: 34px minmax(0, 1fr);
    gap: 30px;
    margin-top: 34px;
  }

  .page-faq .faq-hero__rail {
    display: block;
  }

  .page-faq .metrics-layout {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 34px;
    align-items: start;
  }

  .page-faq .faq-figure--side {
    position: sticky;
    top: calc(var(--bar-h) + 20px);
  }
}

@media (min-width: 1180px) {
  .page-faq .faq-lead {
    max-width: 58ch;
  }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-hero__toc a,
  .page-faq .qa__q {
    transition: none;
  }
}
<<<END>>>