.page-faq {
  --faq-rail-bg: var(--etch-white);
  --faq-mark: 2px;
  background-color: var(--cream);
  color: var(--brown-ink);
  padding-top: clamp(22px, 3.4vw, 46px);
  padding-bottom: clamp(44px, 6vw, 88px);
}

/* ---------- 首屏说明区 ---------- */
.page-faq .faq-intro {
  position: relative;
  padding-bottom: clamp(18px, 2.6vw, 32px);
  border-bottom: var(--rule);
}

.page-faq .faq-intro .breadcrumbs {
  margin-bottom: clamp(14px, 2vw, 22px);
}

.page-faq .faq-intro h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(29px, 4.8vw, 46px);
  line-height: 1.14;
  letter-spacing: -0.02em;
  margin: 10px 0 0;
  max-width: 20ch;
  color: var(--ink-green);
}

.page-faq .faq-intro__lede {
  margin: clamp(14px, 2vw, 20px) 0 0;
  font-size: var(--step-1);
  line-height: 1.85;
  max-width: 62ch;
  color: var(--brown-ink);
}

.page-faq .faq-intro__meta {
  margin: 12px 0 0;
  font-size: var(--step-m1);
  line-height: 1.8;
  max-width: 68ch;
  color: var(--stone-grey);
}

.page-faq .faq-intro__rule {
  display: block;
  height: 3px;
  width: min(38%, 300px);
  margin-top: clamp(18px, 2.4vw, 28px);
  background: linear-gradient(90deg, var(--sand-gold), var(--rock-red) 62%, rgba(178, 58, 46, 0) 100%);
  transform: skewY(-0.6deg);
}

/* ---------- 左右分栏骨架 ---------- */
.page-faq .faq-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 48px);
  margin-top: clamp(26px, 3.6vw, 46px);
}

@media (min-width: 1024px) {
  .page-faq .faq-layout {
    grid-template-columns: 32fr 68fr;
    gap: clamp(26px, 2.8vw, 44px);
    align-items: start;
  }
}

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

@media (min-width: 1180px) {
  .page-faq .faq-rail {
    position: sticky;
    top: 96px;
    max-height: calc(100vh - 112px);
    overflow-y: auto;
    scrollbar-gutter: stable;
    padding-right: 4px;
  }
}

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

/* ---------- 左轨卡片 ---------- */
.page-faq .rail-card {
  background: var(--faq-rail-bg);
  border: var(--rule);
  border-radius: var(--r);
  padding: clamp(16px, 1.8vw, 22px);
  box-shadow: var(--shadow-hair);
}

.page-faq .rail-card + .rail-card {
  margin-top: clamp(16px, 2vw, 24px);
}

.page-faq .rail-card__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--step-2);
  line-height: 1.3;
  letter-spacing: -0.01em;
  margin: 8px 0 8px;
  color: var(--ink-green);
}

.page-faq .rail-card__hint,
.page-faq .rail-card__note {
  margin: 0 0 12px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--stone-grey);
}

.page-faq .rail-card__note {
  margin: 12px 0 0;
}

.page-faq .gls-media {
  margin: 0 0 14px;
  border: var(--rule);
  border-radius: var(--r);
  overflow: hidden;
}

/* 术语小辞典 */
.page-faq .glossary {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-faq .glossary__item {
  background: var(--pale-sand);
  border-left: 2px solid var(--sand-gold);
  border-radius: var(--r);
  padding: 10px 12px;
}

.page-faq .glossary__term {
  margin: 0 0 4px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--ink-green);
}

.page-faq .glossary__def {
  margin: 0;
  font-size: var(--step-m1);
  line-height: 1.72;
  color: var(--brown-ink);
}

.page-faq .glossary__link {
  display: inline-block;
  margin-top: 7px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--rock-red);
  text-decoration: none;
  border-bottom: 1px solid var(--stone-line);
}

.page-faq .glossary__link:hover,
.page-faq .glossary__link:focus-visible {
  border-bottom-color: var(--rock-red);
}

/* 排障清单（深色卡片） */
.page-faq .rail-card--dark {
  background: var(--night-ink);
  border: 1px solid var(--hairline-gold);
  color: var(--on-dark);
}

.page-faq .rail-card--dark .rail-card__title {
  color: var(--on-dark-strong);
}

.page-faq .rail-card--dark .rail-card__note {
  color: var(--on-dark-faint);
}

.page-faq .trouble {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
}

.page-faq .trouble__item {
  display: grid;
  grid-template-columns: 18px 26px minmax(0, 1fr);
  gap: 8px;
  align-items: start;
  padding: 11px 4px;
  border-top: 1px solid var(--hairline-cream);
  cursor: pointer;
}

.page-faq .trouble__item:last-child {
  border-bottom: 1px solid var(--hairline-cream);
}

.page-faq .trouble__box {
  appearance: none;
  -webkit-appearance: none;
  position: relative;
  width: 15px;
  height: 15px;
  margin: 3px 0 0;
  border: 1px solid var(--hairline-gold);
  border-radius: 1px;
  background: transparent;
  cursor: pointer;
}

.page-faq .trouble__box:checked {
  background: var(--data-cyan);
  border-color: var(--data-cyan);
}

.page-faq .trouble__box:checked::after {
  content: "";
  position: absolute;
  left: 4px;
  top: 1px;
  width: 4px;
  height: 8px;
  border-right: 2px solid var(--night-ink);
  border-bottom: 2px solid var(--night-ink);
  transform: rotate(45deg);
}

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

.page-faq .trouble__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--sand-gold);
  padding-top: 2px;
}

.page-faq .trouble__text {
  font-size: var(--step-m1);
  line-height: 1.7;
  color: var(--on-dark-strong);
}

.page-faq .trouble__check {
  display: block;
  margin-top: 4px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-style: normal;
  letter-spacing: 0.06em;
  color: var(--data-cyan);
}

.page-faq .trouble__box:checked ~ .trouble__text {
  color: var(--on-dark-faint);
  text-decoration: line-through;
  text-decoration-color: var(--hairline-gold);
}

/* ---------- 右侧主轨 ---------- */
.page-faq .faq-diagram {
  margin: 0 0 clamp(28px, 4vw, 44px);
  border: var(--rule);
  border-radius: var(--r);
  overflow: hidden;
  background: var(--pale-sand);
}

.page-faq .faq-diagram .media__caption {
  border-top: var(--rule);
  background: var(--etch-white);
}

.page-faq .qa-group + .qa-group,
.page-faq .qa-group + .nulls,
.page-faq .nulls + .qa-group {
  margin-top: clamp(34px, 4.6vw, 60px);
}

.page-faq .qa-group__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 14px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--ink-green);
}

.page-faq .qa-group__head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--step-3);
  line-height: 1.25;
  letter-spacing: -0.015em;
  color: var(--ink-green);
}

.page-faq .qa-group__count {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--stone-grey);
  white-space: nowrap;
}

/* 折叠条目 */
.page-faq .accordion__item {
  border-bottom: var(--rule);
}

.page-faq .accordion__trigger {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr) auto 14px;
  gap: 12px;
  align-items: start;
  width: 100%;
  padding: 15px 4px 15px 0;
  border: 0;
  background: none;
  text-align: left;
  font: inherit;
  color: inherit;
  cursor: pointer;
}

.page-faq .accordion__trigger:hover .q-text,
.page-faq .accordion__trigger:focus-visible .q-text {
  color: var(--ink-green);
}

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

.page-faq .q-code {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--rock-red);
  padding-top: 4px;
}

.page-faq .q-text {
  font-size: var(--step-1);
  line-height: 1.6;
  font-weight: 500;
  color: var(--brown-ink);
  transition: color 120ms linear;
}

.page-faq .q-state {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  padding-top: 6px;
  white-space: nowrap;
}

.page-faq .q-state::before {
  content: "展开";
  color: var(--stone-grey);
}

.page-faq .accordion__trigger[aria-expanded="true"] .q-state::before {
  content: "收起";
  color: var(--ink-green);
}

.page-faq .q-arrow {
  width: 9px;
  height: 9px;
  margin-top: 10px;
  border-right: 1px solid var(--brown-ink);
  border-bottom: 1px solid var(--brown-ink);
  transform: rotate(45deg);
  transition: transform 180ms linear;
}

.page-faq .accordion__trigger[aria-expanded="true"] .q-arrow {
  transform: rotate(225deg);
  border-color: var(--data-cyan);
}

.page-faq .accordion__panel-inner {
  border-left: var(--faq-mark) solid var(--data-cyan);
  padding: 2px 0 20px 16px;
}

.page-faq .q-answer {
  margin: 0;
  font-size: var(--step-0);
  line-height: 1.85;
  max-width: 66ch;
  color: var(--brown-ink);
}

.page-faq .q-answer + .q-answer {
  margin-top: 8px;
}

/* ---------- 空值专条 ---------- */
.page-faq .nulls {
  border-top: 2px solid var(--rock-red);
  padding-top: clamp(18px, 2.4vw, 26px);
}

.page-faq .nulls h2 {
  margin: 8px 0 clamp(16px, 2vw, 22px);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--step-3);
  line-height: 1.28;
  letter-spacing: -0.015em;
  color: var(--ink-green);
  max-width: 24ch;
}

.page-faq .nulls__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

@media (min-width: 720px) {
  .page-faq .nulls__grid {
    grid-template-columns: 1fr 1fr;
  }
}

.page-faq .null-card {
  background: var(--faq-rail-bg);
  border: var(--rule);
  border-left: 3px solid var(--rock-red);
  border-radius: var(--r);
  padding: 16px 18px;
  box-shadow: var(--shadow-hair);
}

.page-faq .null-card--alt {
  border-left-color: var(--stone-grey);
}

.page-faq .null-card__mark {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: var(--step-m1);
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--rock-red);
}

.page-faq .null-card--alt .null-card__mark {
  color: var(--brown-ink);
}

.page-faq .null-card__def {
  margin: 0;
  font-size: var(--step-m1);
  line-height: 1.75;
  color: var(--brown-ink);
}

.page-faq .null-card__why {
  margin: 10px 0 0;
  padding-top: 10px;
  border-top: var(--rule);
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--stone-grey);
}

.page-faq .nulls__foot {
  margin: clamp(16px, 2vw, 22px) 0 0;
  font-size: var(--step-m1);
  line-height: 1.85;
  max-width: 68ch;
  color: var(--brown-ink);
}

.page-faq .nulls__foot a,
.page-faq .contact-band__note a {
  color: var(--rock-red);
  text-decoration: none;
  border-bottom: 1px solid var(--stone-line);
}

.page-faq .nulls__foot a:hover,
.page-faq .contact-band__note a:hover {
  border-bottom-color: var(--rock-red);
}

/* ---------- 联系渠道条 ---------- */
.page-faq .contact-band {
  position: relative;
  margin-top: clamp(40px, 5.6vw, 72px);
  padding: clamp(24px, 3.4vw, 44px);
  background: var(--ink-green);
  border-radius: var(--r);
  color: var(--on-dark);
  overflow: hidden;
  display: grid;
  gap: clamp(18px, 2.4vw, 30px);
}

.page-faq .contact-band::before {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    112deg,
    rgba(212, 160, 23, 0.09) 0 1px,
    rgba(212, 160, 23, 0) 1px 24px
  );
  pointer-events: none;
}

.page-faq .contact-band > * {
  position: relative;
  z-index: 1;
}

.page-faq .contact-band h2 {
  margin: 8px 0 12px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--step-3);
  line-height: 1.28;
  letter-spacing: -0.015em;
  color: var(--on-dark-strong);
}

.page-faq .contact-band__lede {
  margin: 0;
  font-size: var(--step-0);
  line-height: 1.85;
  max-width: 62ch;
  color: var(--on-dark);
}

.page-faq .contact-band__list {
  margin: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--hairline-cream);
  border: 1px solid var(--hairline-cream);
  border-radius: var(--r);
  overflow: hidden;
}

@media (min-width: 720px) {
  .page-faq .contact-band__list {
    grid-template-columns: repeat(3, 1fr);
  }
}

.page-faq .contact-band__row {
  background: var(--night-ink);
  padding: 14px 16px;
  display: grid;
  gap: 6px;
}

.page-faq .contact-band__row dt {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--sand-gold);
}

.page-faq .contact-band__row dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--step-m1);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--on-dark-strong);
  word-break: break-word;
}

.page-faq .contact-band__note {
  margin: 0;
  font-size: 13px;
  line-height: 1.8;
  max-width: 72ch;
  color: var(--on-dark-faint);
}

.page-faq .contact-band__note a {
  color: var(--sand-gold);
  border-bottom-color: var(--hairline-gold);
}

.page-faq .contact-band__note a:hover {
  border-bottom-color: var(--sand-gold);
}

/* ---------- 窄屏收敛 ---------- */
@media (max-width: 620px) {
  .page-faq .accordion__trigger {
    grid-template-columns: 38px minmax(0, 1fr) 14px;
    gap: 10px;
  }

  .page-faq .q-state {
    display: none;
  }

  .page-faq .accordion__panel-inner {
    padding-left: 12px;
  }

  .page-faq .faq-intro h1 {
    max-width: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .q-arrow,
  .page-faq .q-text {
    transition: none;
  }
}
<<<END>>>