.page-faq {
  --faq-idx-w: 248px;
  --faq-rule: rgba(124, 154, 170, 0.2);
  --faq-tint: rgba(53, 224, 208, 0.1);
  background: var(--bg);
  color: var(--text);
}

/* 首屏 */
.page-faq .faq-intro {
  position: relative;
  padding: var(--s6) 0 var(--s5);
  overflow: hidden;
}

.page-faq .faq-intro::before {
  content: "";
  position: absolute;
  top: -240px;
  left: -18%;
  width: 96%;
  height: 560px;
  background:
    radial-gradient(52% 60% at 24% 20%, rgba(53, 224, 208, 0.2), transparent 72%),
    radial-gradient(46% 54% at 78% 4%, rgba(255, 107, 69, 0.12), transparent 74%);
  pointer-events: none;
}

.page-faq .faq-intro::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(242, 247, 247, 0.045) 1px, transparent 1px);
  background-size: 4px 4px;
  opacity: 0.7;
  pointer-events: none;
}

.page-faq .faq-intro > .shell {
  position: relative;
  z-index: 1;
}

.page-faq .faq-intro__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(34px, 6.4vw, 72px);
  line-height: 1.04;
  letter-spacing: -0.02em;
  margin: var(--s2) 0 var(--s3);
  max-width: 16ch;
}

.page-faq .faq-intro__lead {
  margin: 0;
  max-width: 62ch;
  color: var(--text-muted);
  font-size: 16px;
  line-height: 1.8;
}

.page-faq .faq-quick {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 14px;
  margin-top: var(--s4);
  padding: 14px 18px;
  border-radius: var(--r-md);
  border: 1px solid var(--faq-rule);
  background: rgba(10, 34, 51, 0.62);
}

.page-faq .faq-quick__lead {
  margin: 0;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--steel);
}

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

/* 主体布局 */
.page-faq .faq-body {
  padding: 0 0 var(--s7);
}

.page-faq .faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--s5);
  align-items: start;
  padding-top: var(--s4);
  border-top: 1px solid var(--faq-rule);
}

/* 左侧索引 */
.page-faq .faq-index__sticky {
  position: static;
}

.page-faq .faq-index__list {
  display: flex;
  gap: 8px;
  margin-top: var(--s2);
  padding-bottom: 6px;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-faq .faq-index__list::-webkit-scrollbar {
  display: none;
}

.page-faq .faq-index__btn {
  position: relative;
  display: flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 10px;
  width: auto;
  padding: 11px 16px;
  border: 1px solid transparent;
  border-radius: var(--r-md);
  background: transparent;
  color: var(--text-muted);
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.3;
  text-align: left;
  white-space: nowrap;
  cursor: pointer;
  transition: color 0.22s ease, background 0.22s ease, border-color 0.22s ease;
}

.page-faq .faq-index__btn:hover {
  color: var(--text);
  background: rgba(18, 58, 80, 0.7);
}

.page-faq .faq-index__btn:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-faq .faq-index__btn[aria-selected="true"] {
  color: var(--text);
  background: linear-gradient(90deg, rgba(53, 224, 208, 0.18), rgba(53, 224, 208, 0.02) 88%);
  border-color: rgba(53, 224, 208, 0.26);
}

.page-faq .faq-index__btn[aria-selected="true"]::before {
  content: "";
  position: absolute;
  left: -1px;
  top: 50%;
  width: 3px;
  height: 22px;
  transform: translateY(-50%);
  border-radius: 2px;
  background: var(--cyan);
  box-shadow: 0 0 14px rgba(53, 224, 208, 0.85);
}

.page-faq .faq-index__num {
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--steel);
}

.page-faq .faq-index__btn[aria-selected="true"] .faq-index__num {
  color: var(--cyan);
}

.page-faq .faq-index__count {
  margin-left: 4px;
  padding: 2px 7px;
  border-radius: 999px;
  background: rgba(124, 154, 170, 0.14);
  font-size: 10px;
  line-height: 1.4;
  color: var(--steel);
}

.page-faq .faq-index__note {
  margin-top: var(--s3);
  padding: 14px 16px;
  border: 1px solid var(--faq-rule);
  border-radius: var(--r-md);
  background: rgba(18, 58, 80, 0.5);
  font-size: 13px;
  line-height: 1.75;
  color: var(--text-muted);
}

.page-faq .faq-index__note a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* 面板 */
.page-faq .tabs__panel[hidden] {
  display: none;
}

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

.page-faq .faq-panel__head {
  margin-bottom: var(--s4);
}

.page-faq .faq-panel__title {
  margin: 10px 0 12px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 3.6vw, 38px);
  line-height: 1.12;
  letter-spacing: -0.02em;
}

.page-faq .faq-panel__lead {
  margin: 0;
  max-width: 58ch;
  color: var(--text-muted);
  font-size: 15px;
  line-height: 1.8;
}

/* 配图 */
.page-faq .faq-figure {
  margin: 0 0 var(--s4);
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--r-lg);
  object-fit: cover;
  box-shadow: var(--shadow-lift);
}

.page-faq .faq-figure figcaption {
  margin-top: 10px;
  font-size: 12px;
  letter-spacing: 0.04em;
  line-height: 1.6;
  color: var(--steel);
}

/* 问答条目 */
.page-faq .faq-list {
  display: block;
}

.page-faq .faq-item {
  border-top: 1px solid var(--faq-rule);
  transition: background 0.25s ease;
}

.page-faq .faq-item:last-child {
  border-bottom: 1px solid var(--faq-rule);
}

.page-faq .faq-item[open] {
  background: linear-gradient(180deg, rgba(53, 224, 208, 0.1), rgba(10, 34, 51, 0) 82%);
}

.page-faq .faq-item__summary {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 18px 6px;
  list-style: none;
  cursor: pointer;
}

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

.page-faq .faq-item__summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -2px;
  border-radius: var(--r-sm);
}

.page-faq .faq-item__num {
  flex: 0 0 auto;
  padding-top: 3px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--steel);
  font-variant-numeric: tabular-nums;
  transition: color 0.22s ease;
}

.page-faq .faq-item[open] .faq-item__num {
  color: var(--cyan);
}

.page-faq .faq-item__q {
  flex: 1 1 auto;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16px;
  line-height: 1.55;
  color: var(--text);
}

.page-faq .faq-item__icon {
  position: relative;
  flex: 0 0 18px;
  width: 18px;
  height: 18px;
  margin-top: 4px;
}

.page-faq .faq-item__icon::before,
.page-faq .faq-item__icon::after {
  content: "";
  position: absolute;
  background: var(--cyan);
  border-radius: 2px;
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.page-faq .faq-item__icon::before {
  left: 0;
  top: 8px;
  width: 18px;
  height: 2px;
}

.page-faq .faq-item__icon::after {
  left: 8px;
  top: 0;
  width: 2px;
  height: 18px;
}

.page-faq .faq-item[open] .faq-item__icon::after {
  transform: scaleY(0);
  opacity: 0;
}

.page-faq .faq-item__answer {
  padding: 0 30px 20px 26px;
}

.page-faq .faq-item__answer p {
  margin: 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-muted);
}

.page-faq .faq-item__answer a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color 0.2s ease;
}

.page-faq .faq-item__answer a:hover {
  color: var(--ice);
}

/* 桌面端 */
@media (min-width: 720px) {
  .page-faq .faq-item__summary {
    padding: 20px 8px;
    gap: 16px;
  }

  .page-faq .faq-item__q {
    font-size: 17px;
  }

  .page-faq .faq-item__answer {
    padding: 0 44px 22px 40px;
  }
}

@media (min-width: 960px) {
  .page-faq .faq-intro {
    padding: var(--s7) 0 var(--s6);
  }

  .page-faq .faq-layout {
    grid-template-columns: var(--faq-idx-w) minmax(0, 1fr);
    gap: var(--s6);
    padding-top: var(--s5);
  }

  .page-faq .faq-index__sticky {
    position: sticky;
    top: calc(var(--header-h) + 24px);
  }

  .page-faq .faq-index__list {
    flex-direction: column;
    gap: 4px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-faq .faq-index__btn {
    width: 100%;
    padding: 12px 14px;
    white-space: normal;
    font-size: 15px;
  }

  .page-faq .faq-index__count {
    margin-left: auto;
  }

  .page-faq .faq-panel__head {
    margin-bottom: var(--s5);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-index__btn,
  .page-faq .faq-item,
  .page-faq .faq-item__icon::before,
  .page-faq .faq-item__icon::after {
    transition: none;
  }
}
<<<END>>>