.page-faq {
  --faq-rail: 76px;
  --faq-node: 44px;
  --faq-gap: clamp(18px, 3vw, 32px);
  display: block;
  background: var(--ink);
  color: var(--ivory);
  font-family: var(--font-body);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding-block: clamp(96px, 13vw, 142px) clamp(42px, 6vw, 70px);
  background:
    radial-gradient(90% 80% at 88% 4%, rgba(201, 162, 39, 0.16), transparent 60%),
    radial-gradient(70% 70% at 4% 96%, rgba(30, 59, 54, 0.55), transparent 66%),
    var(--ink);
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(115deg, transparent 42%, rgba(201, 162, 39, 0.07) 50%, transparent 58%);
}

.page-faq .faq-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: calc(var(--faq-gap) + 6px);
  align-items: start;
}

.page-faq .faq-hero__text h1 {
  position: relative;
  margin: 0.55em 0 0;
  padding-left: 18px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 5vw, 56px);
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--ivory);
  text-shadow: 0 0 26px rgba(201, 162, 39, 0.16);
}

.page-faq .faq-hero__text h1::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.22em;
  bottom: 0.18em;
  width: 3px;
  background: linear-gradient(180deg, var(--gold-hi), var(--gold));
}

.page-faq .faq-hero .lead {
  margin: 22px 0 0;
  max-width: 34em;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.8;
  color: var(--ivory-78);
}

.page-faq .faq-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-faq .faq-hero__aside {
  padding: 24px 22px;
  background: linear-gradient(165deg, var(--panel-lift), var(--panel) 72%);
  box-shadow:
    inset 0 0 0 1px var(--line-soft),
    inset 0 0 0 2px rgba(201, 162, 39, 0.08);
  clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 16px 100%, 0 calc(100% - 16px));
}

.page-faq .faq-hero__aside-title {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--gold);
}

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

.page-faq .faq-hero__stats li {
  display: grid;
  grid-template-columns: 50px minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
  padding-top: 16px;
  border-top: 1px solid var(--line-soft);
}

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

.page-faq .faq-hero__num {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 30px;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--gold-hi);
}

.page-faq .faq-hero__label {
  font-size: 14px;
  line-height: 1.65;
  color: var(--ivory-62);
}

/* ---------- 章节骨架 ---------- */
.page-faq .faq-sec {
  position: relative;
  padding-block: clamp(52px, 7vw, 88px);
}

.page-faq .faq-sec--scenes {
  background: var(--ink);
}

.page-faq .faq-sec--flow {
  background:
    radial-gradient(80% 60% at 8% 0%, rgba(46, 125, 107, 0.18), transparent 62%),
    linear-gradient(180deg, #10201d 0%, var(--teal) 100%);
}

.page-faq .faq-sec--docs {
  background: var(--ink);
}

.page-faq .faq-sec--keep {
  background: linear-gradient(180deg, var(--ink), #101215 100%);
}

.page-faq .faq-sec--switch {
  background: var(--ink);
}

.page-faq .faq-sec--qa {
  background: linear-gradient(180deg, #101215, var(--ink));
}

.page-faq .faq-sec--contact {
  background:
    radial-gradient(90% 120% at 12% 0%, rgba(201, 162, 39, 0.16), transparent 60%),
    var(--indigo);
}

.page-faq .faq-sec__head {
  max-width: 46em;
  margin-bottom: clamp(24px, 4vw, 42px);
}

.page-faq .faq-sec__head h2 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 3.4vw, 37px);
  line-height: 1.26;
  letter-spacing: -0.02em;
  color: var(--ivory);
}

.page-faq .faq-sec__intro {
  margin: 14px 0 0;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ivory-78);
}

/* ---------- 场景分流 ---------- */
.page-faq .faq-scenes {
  display: grid;
  gap: 14px;
  grid-template-columns: minmax(0, 1fr);
}

.page-faq .faq-scene {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 22px 20px 18px;
  background: linear-gradient(158deg, var(--panel-lift), var(--panel));
  box-shadow: inset 0 0 0 1px var(--line-soft);
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 14px 100%, 0 calc(100% - 14px));
  text-decoration: none;
  color: inherit;
  transition: transform 160ms var(--ease), box-shadow 160ms var(--ease);
}

.page-faq .faq-scene:hover,
.page-faq .faq-scene:focus-visible {
  transform: translateY(-2px);
  box-shadow:
    inset 0 0 0 1px var(--gold-hi),
    inset 0 0 0 3px rgba(201, 162, 39, 0.14);
}

.page-faq .faq-scene:focus-visible {
  outline: none;
}

.page-faq .faq-scene__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--gold);
}

.page-faq .faq-scene__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(17px, 1.8vw, 20px);
  line-height: 1.4;
  color: var(--ivory);
}

.page-faq .faq-scene__desc {
  font-size: 14px;
  line-height: 1.7;
  color: var(--ivory-62);
}

.page-faq .faq-scene__meta {
  margin-top: auto;
  padding-top: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--cool);
  opacity: 0.65;
  transition: color 160ms var(--ease), opacity 160ms var(--ease);
}

.page-faq .faq-scene:hover .faq-scene__meta,
.page-faq .faq-scene:focus-visible .faq-scene__meta {
  color: var(--gold-hi);
  opacity: 1;
}

/* ---------- 四步时间轴 ---------- */
.page-faq .faq-flow-figure {
  margin: 0 0 clamp(28px, 4vw, 46px);
  background: rgba(11, 11, 13, 0.55);
  box-shadow: inset 0 0 0 1px var(--gold-line);
}

.page-faq .faq-timeline {
  list-style: none;
  position: relative;
  margin: 0;
  padding: 0 0 0 var(--faq-rail);
  display: grid;
  gap: 14px;
}

.page-faq .faq-timeline::before {
  content: "";
  position: absolute;
  left: calc((var(--faq-node) - 1px) / 2);
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(180deg, var(--gold-line-strong), var(--gold-line) 58%, rgba(201, 162, 39, 0.05));
}

.page-faq .faq-step {
  position: relative;
  background: linear-gradient(160deg, var(--panel-lift), var(--panel));
  box-shadow:
    inset 0 0 0 1px var(--line-soft),
    inset 2px 0 0 var(--gold-line);
  transition: box-shadow 160ms var(--ease);
}

.page-faq .faq-step:hover,
.page-faq .faq-step[open] {
  box-shadow:
    inset 0 0 0 1px var(--gold-line-strong),
    inset 2px 0 0 var(--gold-hi);
}

.page-faq .faq-step__summary {
  position: relative;
  display: flex;
  align-items: flex-start;
  gap: 16px;
  min-height: calc(var(--faq-node) + 8px);
  padding: 16px 18px 16px 20px;
  cursor: pointer;
  list-style: none;
}

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

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

.page-faq .faq-step__num {
  position: absolute;
  left: calc(var(--faq-rail) * -1);
  top: 0;
  z-index: 2;
  display: grid;
  place-items: center;
  width: var(--faq-node);
  height: var(--faq-node);
  border-radius: 50%;
  border: 1px solid var(--gold-line-strong);
  background: #0b0b0d;
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 15px;
  color: var(--gold);
  transition: color 160ms var(--ease), background 160ms var(--ease), border-color 160ms var(--ease);
}

.page-faq .faq-step[open] .faq-step__num {
  color: var(--ink);
  background: linear-gradient(160deg, var(--gold-hi), var(--gold));
  border-color: var(--gold-hi);
  animation: faq-node-breathe 3s ease-in-out infinite;
}

@keyframes faq-node-breathe {
  0%, 100% { box-shadow: 0 0 0 4px rgba(201, 162, 39, 0.10); }
  50% { box-shadow: 0 0 0 9px rgba(201, 162, 39, 0.22); }
}

.page-faq .faq-step__head {
  display: flex;
  flex-direction: column;
  gap: 5px;
  flex: 1 1 auto;
  min-width: 0;
}

.page-faq .faq-step__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(16px, 1.9vw, 20px);
  line-height: 1.45;
  color: var(--ivory);
  transition: color 160ms var(--ease);
}

.page-faq .faq-step__summary:hover .faq-step__title {
  color: var(--gold-hi);
}

.page-faq .faq-step__cue {
  font-size: 13px;
  line-height: 1.6;
  color: var(--ivory-62);
}

.page-faq .faq-step__body {
  margin: 0 20px;
  padding: 16px 0 22px;
  border-top: 1px dashed var(--line-soft);
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--ivory-78);
}

.page-faq .faq-step__body > p {
  margin: 0 0 16px;
  max-width: 38em;
}

.page-faq .faq-step__figure {
  max-width: 320px;
  margin: 0 0 18px;
  background: rgba(11, 11, 13, 0.6);
  box-shadow: inset 0 0 0 1px var(--gold-line);
}

.page-faq .faq-step__facts {
  margin: 0;
  padding: 16px 0 0;
  display: grid;
  gap: 12px;
  border-top: 1px solid var(--line-soft);
}

.page-faq .faq-step__facts > div {
  display: grid;
  gap: 3px;
}

.page-faq .faq-step__facts dt {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--gold);
}

.page-faq .faq-step__facts dd {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--ivory-78);
  max-width: 38em;
}

/* ---------- 文档目录 ---------- */
.page-faq .faq-doc-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-faq .faq-doc-row {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 6px 14px;
  padding: 20px 0;
  border-top: 1px solid var(--line-soft);
}

.page-faq .faq-doc-row:last-child {
  border-bottom: 1px solid var(--line-soft);
}

.page-faq .faq-doc-row__num {
  grid-column: 1;
  grid-row: 1 / span 2;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--gold);
  padding-top: 5px;
}

.page-faq .faq-doc-row__main {
  grid-column: 2;
  grid-row: 1;
  min-width: 0;
}

.page-faq .faq-doc-row__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(17px, 1.8vw, 20px);
  line-height: 1.4;
  color: var(--ivory);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}

.page-faq .faq-doc-row__name:hover,
.page-faq .faq-doc-row__name:focus-visible {
  color: var(--gold-hi);
  border-bottom-color: var(--gold-line-strong);
  outline: none;
}

.page-faq .faq-doc-row__desc {
  margin: 5px 0 0;
  max-width: 40em;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ivory-62);
}

.page-faq .faq-doc-row__meta {
  grid-column: 2;
  grid-row: 2;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: baseline;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--cool);
}

/* ---------- 双卡区块 ---------- */
.page-faq .faq-two-col {
  display: grid;
  gap: 16px;
}

.page-faq .faq-card {
  padding: 24px 22px;
  background: linear-gradient(160deg, var(--panel-lift), var(--panel));
  box-shadow:
    inset 0 0 0 1px var(--line-soft),
    inset 0 -2px 0 rgba(201, 162, 39, 0.10);
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 14px 100%, 0 calc(100% - 14px));
  transition: transform 160ms var(--ease), box-shadow 160ms var(--ease);
}

.page-faq .faq-card:hover {
  transform: translateY(-2px);
  box-shadow:
    inset 0 0 0 1px var(--gold-line-strong),
    inset 0 -2px 0 rgba(201, 162, 39, 0.26);
}

.page-faq .faq-card__tag {
  display: inline-block;
  padding-bottom: 4px;
  border-bottom: 1px solid var(--gold-line);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.18em;
  color: var(--gold);
}

.page-faq .faq-card h3 {
  margin: 14px 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(18px, 2vw, 22px);
  line-height: 1.42;
  color: var(--ivory);
}

.page-faq .faq-card p {
  margin: 0 0 12px;
  max-width: 36em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ivory-78);
}

/* ---------- 问答折叠 ---------- */
.page-faq .faq-qa-list {
  border-top: 1px solid var(--line-soft);
}

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

.page-faq .faq-qa__summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 14px;
  align-items: baseline;
  padding: 18px 4px;
  cursor: pointer;
  list-style: none;
}

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

.page-faq .faq-qa__summary:focus-visible {
  outline: 2px solid var(--gold-hi);
  outline-offset: 3px;
}

.page-faq .faq-qa__summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 17px;
  line-height: 1;
  color: var(--gold);
  transform: translateY(2px);
}

.page-faq .faq-qa[open] .faq-qa__summary::after {
  content: "−";
}

.page-faq .faq-qa__mark {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--gold);
}

.page-faq .faq-qa__q {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(16px, 1.8vw, 19px);
  line-height: 1.5;
  color: var(--ivory);
  transition: color 160ms var(--ease);
}

.page-faq .faq-qa__summary:hover .faq-qa__q,
.page-faq .faq-qa[open] .faq-qa__q {
  color: var(--gold-hi);
}

.page-faq .faq-qa__a {
  margin: 0 4px 20px;
  padding-left: 38px;
  max-width: 42em;
  font-size: 15px;
  line-height: 1.82;
  color: var(--ivory-78);
}

/* ---------- 联系收束 ---------- */
.page-faq .faq-contact {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
  align-items: start;
}

.page-faq .faq-contact h2 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 3.2vw, 36px);
  line-height: 1.3;
  letter-spacing: -0.02em;
  color: var(--ivory);
}

.page-faq .faq-contact p {
  margin: 16px 0 0;
  max-width: 34em;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--ivory-78);
}

.page-faq .faq-contact__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-faq .faq-contact__list {
  margin: 0;
  padding: 22px;
  display: grid;
  gap: 14px;
  background: rgba(11, 11, 13, 0.42);
  box-shadow: inset 0 0 0 1px var(--gold-line);
}

.page-faq .faq-contact__list > div {
  display: grid;
  gap: 4px;
  padding-bottom: 14px;
  border-bottom: 1px solid rgba(245, 241, 230, 0.12);
}

.page-faq .faq-contact__list > div:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-faq .faq-contact__list dt {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--gold);
}

.page-faq .faq-contact__list dd {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.6;
  color: var(--ivory);
  word-break: break-word;
}

/* ---------- 响应式 ---------- */
@media (max-width: 640px) {
  .page-faq {
    --faq-rail: 52px;
    --faq-node: 34px;
  }

  .page-faq .faq-hero {
    padding-top: 88px;
  }

  .page-faq .faq-hero__text h1 {
    padding-left: 14px;
  }

  .page-faq .faq-step__summary {
    gap: 12px;
    padding: 14px 14px 14px 16px;
    min-height: calc(var(--faq-node) + 10px);
  }

  .page-faq .faq-step__num {
    font-size: 12px;
  }

  .page-faq .faq-step__body {
    margin: 0 14px;
    font-size: 15px;
  }

  .page-faq .faq-step__figure {
    max-width: 100%;
  }

  .page-faq .faq-qa__a {
    padding-left: 4px;
  }

  .page-faq .faq-contact__list {
    padding: 18px;
  }
}

@media (min-width: 600px) {
  .page-faq .faq-scenes {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 780px) {
  .page-faq .faq-doc-row {
    grid-template-columns: 44px minmax(0, 1fr) auto;
    align-items: baseline;
  }

  .page-faq .faq-doc-row__num {
    grid-row: 1;
    padding-top: 4px;
  }

  .page-faq .faq-doc-row__meta {
    grid-column: 3;
    grid-row: 1;
    justify-content: flex-end;
  }
}

@media (min-width: 820px) {
  .page-faq .faq-two-col {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
  }

  .page-faq .faq-hero__aside {
    margin-top: 42px;
  }

  .page-faq .faq-contact {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
  }
}

@media (min-width: 1000px) {
  .page-faq .faq-scenes {
    grid-template-columns: 1.35fr 1fr 1fr 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-scene,
  .page-faq .faq-card,
  .page-faq .faq-step,
  .page-faq .faq-step__num,
  .page-faq .faq-scene__meta {
    transition: none;
  }

  .page-faq .faq-scene:hover,
  .page-faq .faq-card:hover {
    transform: none;
  }

  .page-faq .faq-step[open] .faq-step__num {
    animation: none;
    box-shadow: 0 0 0 5px rgba(201, 162, 39, 0.18);
  }
}
<<<END>>>