.page-faq {
  --faq-index-w: 210px;
  --faq-h2: clamp(28px, 4.4vw, 54px);
  background: var(--ink-900);
  color: var(--text);
  overflow-x: hidden;
}

.page-faq .faq-h2 {
  font-size: var(--faq-h2);
  font-family: var(--font-display);
  line-height: 1.08;
  margin: 0 0 14px;
  letter-spacing: 0.01em;
}

.page-faq .faq-hero {
  position: relative;
  padding: clamp(28px, 5vw, 60px) 0 clamp(40px, 6vw, 84px);
  background:
    radial-gradient(120% 90% at 84% 6%, rgba(63, 224, 192, 0.14) 0%, rgba(10, 38, 34, 0) 58%),
    radial-gradient(90% 80% at 6% 100%, rgba(201, 255, 74, 0.10) 0%, rgba(10, 38, 34, 0) 60%),
    linear-gradient(158deg, #0A2622 0%, #0E1D33 58%, #0A2622 100%);
  border-top: 2px solid var(--lime);
  border-bottom: 1px solid var(--line-soft);
}

.page-faq .faq-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 48px);
  align-items: start;
}

.page-faq .faq-hero__title {
  font-size: clamp(32px, 8vw, 66px);
  line-height: 1.04;
  margin: 12px 0 18px;
  letter-spacing: 0.012em;
}

.page-faq .faq-hero__lead .lede {
  max-width: 34ch;
  color: var(--muted);
  margin: 0 0 26px;
}

.page-faq .faq-hero__acts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-faq .faq-hero__panel {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
}

.page-faq .faq-stat {
  padding: 18px 16px 16px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-height: 108px;
  justify-content: flex-end;
}

.page-faq .faq-stat .stat__value {
  font-family: var(--font-mono);
  font-size: clamp(30px, 4vw, 44px);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--lime);
  line-height: 1;
}

.page-faq .faq-stat .stat__label {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
  line-height: 1.5;
}

/* 01 三步上手 */
.page-faq .faq-steps {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 44px);
  align-items: start;
}

.page-faq .faq-steps__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line-soft);
}

.page-faq .faq-step {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 12px;
  padding: 22px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-faq .faq-step__no {
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 700;
  color: var(--teal);
  line-height: 1;
}

.page-faq .faq-step__body h3 {
  margin: 0 0 8px;
  font-size: 18px;
  letter-spacing: 0.02em;
  color: var(--text);
}

.page-faq .faq-step__body p {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.75;
  max-width: 40ch;
}

.page-faq .faq-shot {
  margin: 0;
}

.page-faq .faq-shot .media__frame {
  aspect-ratio: 3 / 2;
  overflow: hidden;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: var(--ink-700);
}

.page-faq .faq-shot .media__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.page-faq .faq-shot .media__caption {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--muted);
}

/* 02 积分榜读法 */
.page-faq .faq-board-section {
  background: var(--ink-800);
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}

.page-faq .faq-board {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 44px);
  align-items: start;
}

.page-faq .faq-board__metrics {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-faq .faq-metric {
  padding: 20px 18px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: var(--ink-700);
}

.page-faq .faq-metric h3 {
  margin: 0 0 8px;
  font-size: 16px;
  letter-spacing: 0.06em;
  color: var(--text);
}

.page-faq .faq-metric p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--muted);
}

.page-faq .faq-board__aside {
  display: grid;
  gap: 20px;
}

.page-faq .faq-board__formula {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  padding: 18px 16px;
  border: 1px dashed var(--line);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(16px, 2.2vw, 22px);
  color: var(--muted);
}

.page-faq .faq-board__res {
  font-size: clamp(24px, 3.4vw, 36px);
  font-weight: 700;
  color: var(--lime);
}

.page-faq .faq-board__sign {
  color: var(--teal);
  font-weight: 700;
}

.page-faq .faq-board__note,
.page-faq .faq-board__more {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
  max-width: 42ch;
}

.page-faq .faq-board__more a {
  color: var(--teal);
  text-decoration: none;
  border-bottom: 1px solid rgba(63, 224, 192, 0.4);
}

.page-faq .faq-board__more a:hover,
.page-faq .faq-board__more a:focus-visible {
  color: var(--lime);
  border-bottom-color: var(--lime);
}

/* 03 分类问答 */
.page-faq .faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 40px);
  align-items: start;
}

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

.page-faq .faq-index .label {
  display: block;
  margin-bottom: 12px;
}

.page-faq .faq-index__list {
  list-style: none;
  margin: 0;
  padding: 0 0 10px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  border-bottom: 1px solid var(--line);
  scrollbar-width: thin;
}

.page-faq .faq-index__link {
  display: inline-block;
  white-space: nowrap;
  padding: 8px 14px;
  border: 1px solid var(--line-soft);
  border-radius: 999px;
  font-size: 13.5px;
  letter-spacing: 0.06em;
  color: var(--muted);
  text-decoration: none;
  transition: color 200ms var(--ease), border-color 200ms var(--ease), background-color 200ms var(--ease);
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  color: var(--ink-900);
  background: var(--lime);
  border-color: var(--lime);
}

.page-faq .faq-groups {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
  min-width: 0;
}

.page-faq .faq-group {
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-faq .faq-group__title {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: 19px;
  letter-spacing: 0.08em;
  color: var(--lime);
}

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

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

.page-faq .faq-item > summary {
  list-style: none;
  cursor: pointer;
}

.page-faq .faq-item > summary::-webkit-details-marker {
  display: none;
}

.page-faq .faq-q {
  position: relative;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 34px 16px 0;
  font-size: 15.5px;
  line-height: 1.6;
  color: var(--text);
  transition: color 200ms var(--ease);
}

.page-faq .faq-q::before {
  content: "";
  flex: 0 0 auto;
  width: 3px;
  height: 16px;
  background: var(--lime);
  border-radius: 2px;
  transition: height 240ms var(--ease);
}

.page-faq .faq-q::after {
  content: "+";
  position: absolute;
  right: 4px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1;
  color: var(--muted);
  transition: transform 240ms var(--ease), color 240ms var(--ease);
}

.page-faq .faq-item[open] .faq-q::before {
  height: 24px;
}

.page-faq .faq-item[open] .faq-q::after {
  transform: translateY(-50%) rotate(45deg);
  color: var(--lime);
}

.page-faq .faq-q:hover {
  color: var(--lime);
}

.page-faq .faq-a {
  padding: 0 34px 18px 17px;
}

.page-faq .faq-a p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
  max-width: 46ch;
}

.page-faq .faq-a a {
  color: var(--teal);
  text-decoration: none;
  border-bottom: 1px solid rgba(63, 224, 192, 0.4);
}

.page-faq .faq-a a:hover,
.page-faq .faq-a a:focus-visible {
  color: var(--lime);
  border-bottom-color: var(--lime);
}

/* 04 术语速查 */
.page-faq .faq-terms-section {
  background: var(--ink-800);
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}

.page-faq .terms {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-faq .term {
  background: var(--ink-900);
  padding: 16px 18px;
  transition: background-color 220ms var(--ease), box-shadow 220ms var(--ease);
}

.page-faq .term__name {
  display: block;
  font-family: var(--font-display);
  font-size: 16px;
  letter-spacing: 0.08em;
  color: var(--text);
  margin-bottom: 6px;
}

.page-faq .term__desc {
  display: block;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--muted);
  max-width: 40ch;
}

/* 05 遇到问题 */
.page-faq .faq-help {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 48px);
  align-items: start;
}

.page-faq .faq-help__list {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
}

.page-faq .faq-help__list li {
  position: relative;
  padding: 12px 0 12px 20px;
  border-bottom: 1px solid var(--line-soft);
  font-size: 15px;
  line-height: 1.7;
  color: var(--muted);
}

.page-faq .faq-help__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 20px;
  width: 10px;
  height: 2px;
  background: var(--lime);
}

.page-faq .faq-help__note {
  margin: 18px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
  max-width: 42ch;
}

.page-faq .faq-help__aside {
  display: grid;
  gap: 12px;
}

.page-faq .faq-link-card {
  display: block;
  padding: 18px 18px 20px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: var(--ink-700);
  text-decoration: none;
  transition: border-color 220ms var(--ease), background-color 220ms var(--ease);
}

.page-faq .faq-link-card .label {
  display: block;
  margin-bottom: 8px;
  color: var(--teal);
}

.page-faq .faq-link-card strong {
  display: block;
  font-size: 16px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--text);
  margin-bottom: 8px;
}

.page-faq .faq-link-card__desc {
  display: block;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--muted);
}

.page-faq .faq-link-card:hover,
.page-faq .faq-link-card:focus-visible {
  border-color: var(--lime);
  background: var(--ink-750);
}

.page-faq .faq-link-card:hover strong,
.page-faq .faq-link-card:focus-visible strong {
  color: var(--lime);
}

.page-faq .faq-index__link:focus-visible,
.page-faq .faq-q:focus-visible,
.page-faq .faq-board__more a:focus-visible,
.page-faq .faq-a a:focus-visible,
.page-faq .faq-link-card:focus-visible,
.page-faq .term:focus-visible {
  outline: 2px solid var(--teal);
  outline-offset: 3px;
}

@media (min-width: 760px) {
  .page-faq .faq-steps {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-faq .faq-board {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-faq .faq-board__metrics {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-faq .terms {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-faq .faq-help {
    grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
  }

  .page-faq .faq-hero__panel {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(32px, 5vw, 72px);
  }

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

  .page-faq .faq-stat {
    min-height: 96px;
  }

  .page-faq .faq-layout {
    grid-template-columns: var(--faq-index-w) minmax(0, 1fr);
    gap: clamp(32px, 4vw, 64px);
  }

  .page-faq .faq-index {
    position: sticky;
    top: calc(var(--header-h) + 20px);
  }

  .page-faq .faq-index__list {
    display: block;
    overflow: visible;
    padding: 0 0 0 16px;
    border-bottom: 0;
    border-left: 1px solid var(--line);
  }

  .page-faq .faq-index__list li + li {
    margin-top: 4px;
  }

  .page-faq .faq-index__link {
    display: block;
    position: relative;
    padding: 10px 0;
    margin-left: -17px;
    padding-left: 16px;
    border: 0;
    border-radius: 0;
    font-size: 14px;
    white-space: normal;
  }

  .page-faq .faq-index__link::before {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    width: 3px;
    height: 70%;
    background: var(--lime);
    transform: translateY(-50%) scaleY(0);
    transform-origin: center;
    transition: transform 240ms var(--ease);
  }

  .page-faq .faq-index__link:hover,
  .page-faq .faq-index__link:focus-visible {
    color: var(--text);
    background: transparent;
    border-color: transparent;
  }

  .page-faq .faq-index__link:hover::before,
  .page-faq .faq-index__link:focus-visible::before {
    transform: translateY(-50%) scaleY(1);
  }

  .page-faq .faq-q {
    font-size: 16px;
  }

  .page-faq .faq-a {
    padding-right: 48px;
  }

  .page-faq .term__desc {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height 260ms var(--ease), opacity 220ms var(--ease);
  }

  .page-faq .term:hover,
  .page-faq .term:focus,
  .page-faq .term:focus-within {
    background: var(--ink-750);
    box-shadow: inset 3px 0 0 var(--lime);
  }

  .page-faq .term:hover .term__desc,
  .page-faq .term:focus .term__desc,
  .page-faq .term:focus-within .term__desc {
    max-height: 14em;
    opacity: 1;
    margin-top: 2px;
  }

  .page-faq .term:hover .term__name,
  .page-faq .term:focus .term__name,
  .page-faq .term:focus-within .term__name {
    color: var(--lime);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .reveal,
  .page-faq .faq-index__link,
  .page-faq .faq-index__link::before,
  .page-faq .faq-q,
  .page-faq .faq-q::before,
  .page-faq .faq-q::after,
  .page-faq .term,
  .page-faq .term__desc,
  .page-faq .faq-link-card {
    transition: none !important;
  }

  .page-faq .term__desc {
    max-height: none;
    opacity: 1;
  }
}