.page-faq {
  --faq-gap: clamp(28px, 4vw, 48px);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(36px, 6vw, 80px) 0 clamp(40px, 6vw, 72px);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: min(46%, 520px);
  height: 6px;
  background: var(--flag);
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  right: -10%;
  bottom: -38%;
  width: min(54%, 560px);
  height: 172%;
  transform: skewX(-13deg);
  background: linear-gradient(180deg, rgba(47, 123, 255, .28), rgba(47, 123, 255, 0) 72%);
  pointer-events: none;
}

.page-faq .faq-hero__inner {
  position: relative;
  z-index: 1;
}

.page-faq .faq-hero__title {
  margin: 16px 0 0;
  max-width: 17em;
  font-family: var(--font-display);
  font-size: clamp(32px, 5.2vw, 58px);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -.015em;
  color: var(--paper);
}

.page-faq .faq-hero__lede {
  margin: 22px 0 0;
  max-width: 62ch;
  font-size: 17px;
  line-height: 1.85;
  color: rgba(242, 244, 238, .8);
}

.page-faq .faq-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 10px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}

/* ---------- 主体两栏 ---------- */
.page-faq .faq-body {
  padding: clamp(40px, 6vw, 88px) 0;
}

.page-faq .faq-body__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--faq-gap);
}

/* 左侧索引 */
.page-faq .faq-index {
  padding: 20px 18px;
  border: 2px solid var(--ink);
  background: rgba(14, 59, 46, .05);
}

.page-faq .faq-index__label {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--indigo);
}

.page-faq .faq-index__list {
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-index__link {
  display: grid;
  grid-template-columns: 2.2em minmax(0, 1fr);
  gap: 10px;
  padding: 9px 10px 9px 8px;
  border-left: 3px solid transparent;
  color: var(--ink);
  font-size: 14px;
  line-height: 1.55;
  text-decoration: none;
  transition: border-color var(--dur) var(--ease),
              background-color var(--dur) var(--ease);
}

.page-faq .faq-index__link:hover {
  border-left-color: var(--flag);
  background: rgba(255, 90, 43, .1);
}

.page-faq .faq-index__link:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 2px;
  border-left-color: var(--flag);
}

.page-faq .faq-index__num {
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--mono-gray);
}

/* ---------- 问答条目 ---------- */
.page-faq .faq-answers {
  min-width: 0;
}

.page-faq .faq-item {
  border-top: 2px solid var(--ink);
  scroll-margin-top: 84px;
}

.page-faq .faq-item:last-child {
  border-bottom: 2px solid var(--ink);
}

.page-faq .faq-item__details {
  padding: clamp(18px, 3vw, 30px) 0;
}

.page-faq .faq-item__summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 10px 16px;
  align-items: baseline;
  cursor: pointer;
  list-style: none;
}

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

.page-faq .faq-item__summary:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 4px;
}

.page-faq .faq-item__num {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--indigo);
}

.page-faq .faq-item__q {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(19px, 2.4vw, 26px);
  font-weight: 800;
  line-height: 1.35;
  letter-spacing: -.005em;
  color: var(--ink);
}

.page-faq .faq-item__toggle {
  font-family: var(--font-mono);
  font-size: 22px;
  line-height: 1;
  color: var(--blue);
  transition: transform var(--dur) var(--ease);
}

.page-faq .faq-item__details[open] .faq-item__toggle {
  transform: rotate(45deg);
}

.page-faq .faq-item__answer {
  padding: 18px 0 0;
  color: var(--ink);
}

.page-faq .faq-item__answer p {
  margin: 0 0 1em;
  max-width: 66ch;
  font-size: 17px;
  line-height: 1.85;
}

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

.page-faq .faq-item__answer a {
  color: var(--indigo);
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}

.page-faq .faq-item__answer a:hover,
.page-faq .faq-item__answer a:focus-visible {
  color: var(--flag);
}

.page-faq .faq-item__answer a:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 2px;
}

/* 数据条列 */
.page-faq .faq-facts {
  display: grid;
  gap: 0;
  margin: 1.4em 0;
  padding: 0 0 0 18px;
  max-width: 62ch;
  list-style: none;
  border-left: 3px solid var(--blue);
}

.page-faq .faq-facts li {
  padding: 11px 0;
  border-bottom: 1px dashed rgba(7, 18, 15, .2);
  font-size: 16px;
  line-height: 1.7;
  color: var(--ink);
}

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

.page-faq .num {
  font-family: var(--font-mono);
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--indigo);
}

/* 图 */
.page-faq .faq-figure {
  margin: 26px 0 10px;
  overflow: hidden;
  border: 2px solid var(--night);
  background: var(--night);
  box-shadow: 6px 6px 0 rgba(7, 18, 15, .85);
}

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

.page-faq .faq-figure figcaption {
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
  color: rgba(242, 244, 238, .8);
  background: var(--night);
}

/* ---------- 尾部引导 ---------- */
.page-faq .faq-cta {
  padding: clamp(40px, 6vw, 80px) 0;
}

.page-faq .faq-cta__inner {
  display: grid;
  gap: 28px;
}

.page-faq .faq-cta__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-size: clamp(24px, 3.4vw, 36px);
  font-weight: 800;
  line-height: 1.2;
  color: var(--paper);
}

.page-faq .faq-cta__lede {
  margin: 16px 0 0;
  max-width: 54ch;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(242, 244, 238, .78);
}

.page-faq .faq-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-faq .faq-item__answer {
    padding-left: 3.6em;
  }
}

@media (min-width: 1024px) {
  .page-faq .faq-body__grid {
    grid-template-columns: 262px minmax(0, 1fr);
    gap: clamp(36px, 5vw, 80px);
    align-items: start;
  }

  .page-faq .faq-index {
    position: sticky;
    top: 28px;
  }

  .page-faq .faq-cta__inner {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    align-items: end;
    gap: clamp(32px, 5vw, 72px);
  }
}

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