.page-faq {
  --faq-rail-w: 208px;
  --faq-panel: var(--ink-800);
  --faq-radius: 0;
  background: var(--ink-900);
  color: var(--text-100);
}

/* ---------- 面包屑 ---------- */
.page-faq .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 clamp(16px, 3vw, 28px);
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .08em;
  color: var(--text-300);
}
.page-faq .breadcrumb li {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.page-faq .breadcrumb li + li::before {
  content: "/";
  color: var(--line-500);
}
.page-faq .breadcrumb a {
  color: var(--text-300);
  text-decoration: none;
}
.page-faq .breadcrumb a:hover,
.page-faq .breadcrumb a:focus-visible {
  color: var(--cyan);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  padding: clamp(24px, 5vw, 56px) 0 clamp(24px, 4vw, 44px);
  border-bottom: 1px solid var(--line-500);
  background:
    radial-gradient(120% 100% at 88% -10%, rgba(0, 229, 208, .10), transparent 62%),
    radial-gradient(70% 80% at 0% 110%, rgba(255, 122, 47, .07), transparent 60%),
    linear-gradient(180deg, var(--ink-800), var(--ink-900));
}

.page-faq .faq-hero__grid {
  display: grid;
  gap: clamp(20px, 4vw, 44px);
}
@media (min-width: 900px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
    align-items: end;
  }
}

.page-faq .faq-hero__kicker {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .14em;
  color: var(--cyan);
}

.page-faq .faq-hero__title {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(32px, 6.2vw, 68px);
  line-height: 1.04;
  letter-spacing: -.015em;
  color: var(--text-100);
}
.page-faq .faq-hero__accent {
  color: var(--cyan);
}

.page-faq .faq-hero__lede {
  max-width: 46ch;
  margin: 0;
  font-size: var(--fs-17);
  line-height: 1.8;
  color: var(--text-100);
}

.page-faq .faq-hero__figure {
  margin: 0;
}
.page-faq .faq-hero__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--line-500);
}

.page-faq .faq-hero__facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(24px, 4vw, 36px) 0 0;
  padding: 0;
  background: var(--line-500);
  border: 1px solid var(--line-500);
}
.page-faq .faq-hero__facts > div {
  background: var(--ink-900);
  padding: 14px 16px;
}
.page-faq .faq-hero__facts dt {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .08em;
  color: var(--text-300);
}
.page-faq .faq-hero__facts dd {
  margin: 6px 0 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--fs-22);
  line-height: 1.1;
  color: var(--text-100);
}
.page-faq .faq-hero__facts dd small {
  margin-left: 4px;
  font-size: var(--fs-12);
  color: var(--text-300);
}
@media (max-width: 559px) {
  .page-faq .faq-hero__facts > div { padding: 10px; }
  .page-faq .faq-hero__facts dt { font-size: 11px; letter-spacing: .04em; }
  .page-faq .faq-hero__facts dd { font-size: var(--fs-17); }
}

/* ---------- 骨架：目录 + 步骤流 ---------- */
.page-faq .faq-shell {
  display: grid;
  gap: clamp(20px, 4vw, 44px);
  padding: clamp(28px, 5vw, 56px) 0 clamp(40px, 7vw, 88px);
}
@media (min-width: 1024px) {
  .page-faq .faq-shell {
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
    align-items: start;
  }
}

.page-faq .faq-rail__inner {
  border-top: 2px solid var(--cyan);
  padding-top: 12px;
}
@media (min-width: 1024px) {
  .page-faq .faq-rail__inner {
    position: sticky;
    top: 84px;
  }
}
.page-faq .faq-rail__label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .14em;
  color: var(--text-300);
}
.page-faq .faq-rail__list {
  display: grid;
  gap: 2px;
  margin: 0;
  padding: 0 0 0 0;
  list-style: none;
  border-left: 1px solid var(--line-500);
}
.page-faq .faq-rail__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-left: -1px;
  padding: 9px 0 9px 15px;
  border-left: 2px solid transparent;
  font-size: var(--fs-14);
  line-height: 1.5;
  color: var(--text-300);
  text-decoration: none;
  transition: color .16s var(--ease), border-color .16s var(--ease);
}
.page-faq .faq-rail__link .mono {
  font-size: var(--fs-12);
  color: var(--line-500);
}
.page-faq .faq-rail__link:hover,
.page-faq .faq-rail__link:focus-visible {
  color: var(--cyan);
  border-left-color: var(--cyan);
}
.page-faq .faq-rail__link:hover .mono,
.page-faq .faq-rail__link:focus-visible .mono {
  color: var(--cyan);
}

@media (max-width: 1023px) {
  .page-faq .faq-rail__label { margin-bottom: 8px; }
  .page-faq .faq-rail__list {
    grid-auto-flow: column;
    grid-auto-columns: max-content;
    overflow-x: auto;
    gap: 0;
    border-left: 0;
    border-bottom: 1px solid var(--line-500);
    scrollbar-width: thin;
  }
  .page-faq .faq-rail__link {
    margin-left: 0;
    padding: 10px 14px;
    border-left: 0;
    border-bottom: 2px solid transparent;
    white-space: nowrap;
  }
  .page-faq .faq-rail__link:hover,
  .page-faq .faq-rail__link:focus-visible {
    border-left-color: transparent;
    border-bottom-color: var(--cyan);
  }
}

/* ---------- 章节 ---------- */
.page-faq .faq-block {
  padding-top: clamp(26px, 4vw, 44px);
  scroll-margin-top: 96px;
}
.page-faq .faq-flow > .faq-block:first-child {
  padding-top: 0;
}

.page-faq .faq-block__head {
  display: flex;
  align-items: baseline;
  gap: clamp(10px, 2vw, 18px);
  padding-bottom: 12px;
  margin-bottom: clamp(16px, 3vw, 24px);
  border-bottom: 1px solid var(--line-500);
}
.page-faq .faq-block__num {
  flex: none;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(26px, 5vw, 44px);
  line-height: .9;
  color: var(--cyan);
  opacity: .5;
}
.page-faq .faq-block__eyebrow {
  margin: 0 0 4px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .14em;
  color: var(--text-300);
}
.page-faq .faq-block__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(22px, 3.4vw, 34px);
  line-height: 1.18;
  letter-spacing: -.01em;
  color: var(--text-100);
}
.page-faq .faq-block__lede {
  max-width: 56ch;
  margin: 0 0 clamp(14px, 2.4vw, 20px);
  font-size: var(--fs-17);
  line-height: 1.8;
  color: var(--text-300);
}
.page-faq .faq-block__note {
  max-width: 60ch;
  margin: 16px 0 0;
  padding-left: 12px;
  border-left: 2px solid var(--line-500);
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--text-300);
}
.page-faq .faq-block__note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 229, 208, .4);
}
.page-faq .faq-block__note a:hover,
.page-faq .faq-block__note a:focus-visible {
  border-bottom-color: var(--cyan);
}

/* ---------- 三个定位问题 ---------- */
.page-faq .faq-probe__grid {
  display: grid;
  gap: 1px;
  background: var(--line-500);
  border: 1px solid var(--line-500);
}
@media (min-width: 760px) {
  .page-faq .faq-probe__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}
.page-faq .faq-probe {
  background: var(--faq-panel);
  padding: clamp(14px, 2.4vw, 20px);
}
.page-faq .faq-probe__q {
  display: flex;
  gap: 8px;
  margin: 0 0 10px;
  font-size: var(--fs-14);
  font-weight: 600;
  line-height: 1.55;
  color: var(--text-100);
}
.page-faq .faq-probe__q span {
  flex: none;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .06em;
  color: var(--cyan);
  padding-top: .25em;
}
.page-faq .faq-probe__list {
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--text-300);
}
.page-faq .faq-probe__list li {
  position: relative;
  padding-left: 12px;
}
.page-faq .faq-probe__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .78em;
  width: 4px;
  height: 4px;
  background: var(--line-500);
}

/* ---------- 步骤卡 ---------- */
.page-faq .faq-steps {
  display: grid;
  gap: 10px;
}
.page-faq .faq-step {
  background: var(--faq-panel);
  border: 1px solid var(--line-500);
  border-left: 3px solid var(--cyan);
}
.page-faq .faq-step--alert {
  border-left-color: var(--orange);
}
.page-faq .faq-step > summary {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 8px 12px;
  padding: 13px 16px;
  list-style: none;
  cursor: pointer;
  font-size: var(--fs-17);
  line-height: 1.55;
  color: var(--text-100);
  transition: background-color .16s var(--ease);
}
.page-faq .faq-step > summary::-webkit-details-marker { display: none; }
.page-faq .faq-step > summary::marker { content: ""; }
.page-faq .faq-step > summary:hover { background: var(--ink-700); }
.page-faq .faq-step[open] > summary {
  border-bottom: 1px solid var(--line-500);
}
.page-faq .faq-step__no {
  flex: none;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--fs-14);
  letter-spacing: .06em;
  color: var(--cyan);
  min-width: 2.4em;
}
.page-faq .faq-step--alert .faq-step__no {
  color: var(--orange);
}
.page-faq .faq-step__label {
  flex: 1 1 auto;
  min-width: 0;
}
.page-faq .faq-step__flag {
  display: inline-block;
  margin-left: 8px;
  padding: 1px 6px;
  border: 1px solid var(--orange);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  line-height: 1.5;
  color: var(--orange);
  vertical-align: middle;
}
.page-faq .faq-step__toggle {
  flex: none;
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: var(--fs-17);
  line-height: 1;
  color: var(--text-300);
}
.page-faq .faq-step__toggle::after { content: "+"; }
.page-faq .faq-step[open] .faq-step__toggle::after { content: "\2212"; }

.page-faq .faq-step__body {
  padding: 12px 16px 16px;
}
.page-faq .faq-step__body p {
  max-width: 48ch;
  margin: 0 0 10px;
  font-size: var(--fs-17);
  line-height: 1.75;
  color: var(--text-100);
}
.page-faq .faq-step__body p:last-child { margin-bottom: 0; }

.page-faq .faq-step__check {
  display: flex;
  gap: 10px;
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px dashed var(--line-500);
  font-size: var(--fs-14);
  line-height: 1.7;
  color: var(--text-300);
}
.page-faq .faq-step__checklabel {
  flex: none;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .1em;
  color: var(--cyan);
  padding-top: .3em;
}
.page-faq .faq-step--alert .faq-step__checklabel {
  color: var(--orange);
}

/* ---------- 图文 ---------- */
.page-faq .faq-figure {
  margin: clamp(18px, 3vw, 26px) 0 0;
}
.page-faq .faq-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--line-500);
}
.page-faq .faq-figure__caption {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  line-height: 1.7;
  letter-spacing: .04em;
  color: var(--text-300);
}

/* ---------- 兼容检查清单 ---------- */
.page-faq .faq-checklist {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-500);
}
.page-faq .faq-checklist__item {
  display: grid;
  gap: 6px;
  padding: clamp(14px, 2.4vw, 18px) 0;
  border-bottom: 1px solid var(--line-500);
}
@media (min-width: 700px) {
  .page-faq .faq-checklist__item {
    grid-template-columns: 56px minmax(0, 1fr);
    gap: 16px;
  }
}
.page-faq .faq-checklist__no {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--fs-14);
  letter-spacing: .06em;
  color: var(--cyan);
  padding-top: .25em;
}
.page-faq .faq-checklist__title {
  margin: 0 0 5px;
  font-size: var(--fs-17);
  font-weight: 600;
  line-height: 1.5;
  color: var(--text-100);
}
.page-faq .faq-checklist__text {
  max-width: 56ch;
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--text-300);
}

/* ---------- 术语表 ---------- */
.page-faq .faq-glossary {
  padding: clamp(20px, 4vw, 34px);
  border: 1px solid var(--line-500);
  background:
    linear-gradient(180deg, rgba(18, 32, 47, .06), rgba(18, 32, 47, 0)),
    var(--paper-200);
  color: var(--paper-ink);
}
.page-faq .faq-glossary__eyebrow {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .14em;
  color: rgba(18, 32, 47, .62);
}
.page-faq .faq-glossary__title {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(20px, 3.2vw, 30px);
  line-height: 1.2;
  letter-spacing: -.01em;
  color: var(--paper-ink);
}
.page-faq .faq-glossary p {
  max-width: 34em;
  margin: 0 0 12px;
  font-size: var(--fs-17);
  line-height: 1.9;
  color: var(--paper-ink);
}
.page-faq .faq-glossary__links {
  margin: 16px 0 0;
  padding: 14px 0 0;
  list-style: none;
  border-top: 1px solid rgba(18, 32, 47, .18);
  display: grid;
  gap: 8px;
}
.page-faq .faq-glossary__links a {
  font-size: var(--fs-14);
  line-height: 1.7;
  color: var(--paper-ink);
  text-decoration: none;
  border-bottom: 1px solid rgba(18, 32, 47, .35);
}
.page-faq .faq-glossary__links a:hover,
.page-faq .faq-glossary__links a:focus-visible {
  border-bottom-color: var(--paper-ink);
}

/* ---------- 细屏兜底 ---------- */
@media (max-width: 420px) {
  .page-faq .faq-step > summary { padding: 12px 12px; }
  .page-faq .faq-step__body { padding: 12px 12px 14px; }
  .page-faq .faq-step__check { flex-direction: column; gap: 4px; }
  .page-faq .faq-glossary p { font-size: var(--fs-14); }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-rail__link,
  .page-faq .faq-step > summary {
    transition: none;
  }
}
<<<END>>>