/* ===== 规则知识库 · page-faq ===== */
.page-faq {
  --kb-rail: 268px;
  background:
    radial-gradient(1100px 540px at 84% -8%, rgba(47, 164, 95, .13), transparent 62%),
    radial-gradient(900px 480px at -8% 34%, rgba(58, 110, 165, .10), transparent 60%),
    var(--ink);
  color: var(--paper);
  font-family: var(--font-sans);
  line-height: 1.75;
  overflow-x: clip;
}

.page-faq .kb-wrap {
  width: 100%;
  max-width: 1220px;
  margin-inline: auto;
  padding-inline: clamp(16px, 5vw, 48px);
}

.page-faq .kb-crumb {
  padding-top: clamp(16px, 3.5vw, 30px);
}

/* ---------- 首屏 ---------- */
.page-faq .kb-hero {
  padding-block: clamp(24px, 5vw, 54px) clamp(30px, 5vw, 58px);
  background: linear-gradient(180deg, rgba(22, 32, 43, .94) 0%, rgba(18, 16, 12, .35) 100%);
  border-bottom: 1px solid var(--line);
}

.page-faq .kb-kicker {
  margin: 0;
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--grass-soft);
}

.page-faq .kb-hero h1 {
  margin: 14px 0 0;
  max-width: 24ch;
  font-size: clamp(1.9rem, 5vw, 3.4rem);
  font-weight: 900;
  line-height: 1.14;
  letter-spacing: -.02em;
  color: var(--paper);
}

.page-faq .kb-hl {
  color: var(--grass-soft);
}

.page-faq .kb-lede {
  margin: clamp(14px, 2vw, 20px) 0 0;
  max-width: 66ch;
  font-size: clamp(15px, 1.6vw, 17px);
  color: rgba(237, 243, 238, .82);
}

.page-faq .kb-facts {
  margin: clamp(24px, 4vw, 38px) 0 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-faq .kb-facts > div {
  background: rgba(22, 32, 43, .88);
  padding: 14px 16px;
}

.page-faq .kb-facts dt {
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--mist);
}

.page-faq .kb-facts dd {
  margin: 4px 0 0;
  font-size: clamp(18px, 2.6vw, 24px);
  font-weight: 700;
  color: var(--paper);
  letter-spacing: -.01em;
}

/* ---------- 主体区 ---------- */
.page-faq .kb-board {
  padding-block: clamp(26px, 5vw, 56px);
}

.page-faq .kb-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 40px);
  align-items: start;
}

/* 分组索引 */
.page-faq .kb-rail {
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: rgba(22, 32, 43, .72);
  padding: 18px;
}

.page-faq .kb-rail-title {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-faq .kb-nav {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-faq .kb-nav a {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border: 1px solid transparent;
  border-radius: var(--r-sm);
  color: var(--paper);
  text-decoration: none;
  transition: border-color .18s var(--ease), background .18s var(--ease);
}

.page-faq .kb-nav a:hover,
.page-faq .kb-nav a:focus-visible {
  border-color: var(--grass);
  background: rgba(47, 164, 95, .10);
}

.page-faq .kb-nav-i {
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--grass);
}

.page-faq .kb-nav-t {
  font-size: 14px;
  font-weight: 500;
}

.page-faq .kb-nav-c {
  font-size: 12px;
  color: var(--mist);
  padding: 1px 7px;
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
}

.page-faq .kb-rail-note {
  margin: 16px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: 12px;
  line-height: 1.7;
  color: var(--mist);
}

/* 右列 */
.page-faq .kb-col {
  min-width: 0;
  display: grid;
  gap: clamp(22px, 3.5vw, 40px);
}

.page-faq .kb-filters {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: rgba(22, 32, 43, .62);
}

.page-faq .kb-filters-label {
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--mist);
  margin-right: 2px;
}

.page-faq .kb-filters .chip {
  font-family: inherit;
  font-size: 13px;
  padding: 6px 13px;
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  background: transparent;
  color: var(--paper);
  cursor: pointer;
  transition: background .18s var(--ease), border-color .18s var(--ease), color .18s var(--ease);
}

.page-faq .kb-filters .chip:hover {
  border-color: var(--grass);
}

.page-faq .kb-filters .chip.is-active,
.page-faq .kb-filters .chip[aria-pressed="true"] {
  background: var(--grass);
  border-color: var(--grass);
  color: var(--ink);
  font-weight: 600;
}

/* 问题组 */
.page-faq .kb-questions {
  display: grid;
  gap: clamp(30px, 4.5vw, 54px);
}

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

.page-faq .kb-group-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: start;
  gap: 14px;
  padding-bottom: 14px;
  border-bottom: 2px solid var(--grass);
}

.page-faq .kb-group-num {
  font-size: clamp(24px, 4vw, 34px);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -.02em;
  color: var(--grass);
}

.page-faq .kb-group-head h2 {
  margin: 0;
  font-size: clamp(1.2rem, 2.6vw, 1.7rem);
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-faq .kb-group-head p {
  margin: 6px 0 0;
  max-width: 62ch;
  font-size: 14px;
  color: rgba(237, 243, 238, .72);
}

.page-faq .kb-group-head p a {
  color: var(--grass-soft);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-faq .kb-group-count {
  font-size: 12px;
  color: var(--ink);
  background: var(--cream);
  border-radius: var(--r-pill);
  padding: 3px 10px;
  white-space: nowrap;
}

.page-faq .kb-figure {
  margin: 18px 0 0;
}

.page-faq .kb-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 320px;
  object-fit: cover;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
}

.page-faq .kb-figure figcaption {
  margin-top: 8px;
  font-size: 12px;
  color: var(--mist);
}

/* 折叠问答 */
.page-faq .kb-list {
  margin-top: 18px;
  display: grid;
  gap: 10px;
}

.page-faq .kb-qa {
  border: 1px solid var(--line);
  border-left: 3px solid var(--line);
  border-radius: var(--r-sm);
  background: rgba(22, 32, 43, .55);
  transition: border-color .18s var(--ease), background .18s var(--ease);
}

.page-faq .kb-qa:hover {
  border-color: rgba(47, 164, 95, .5);
  border-left-color: var(--grass);
}

.page-faq .kb-qa[open] {
  border-left-color: var(--grass);
  background: rgba(22, 32, 43, .94);
}

.page-faq .kb-qa summary {
  list-style: none;
  cursor: pointer;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: start;
  gap: 14px;
  padding: 14px 16px 14px 18px;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.6;
  color: var(--paper);
}

.page-faq .kb-qa summary::-webkit-details-marker {
  display: none;
}

.page-faq .kb-qa summary:focus-visible {
  outline: 2px solid var(--grass);
  outline-offset: 2px;
  border-radius: var(--r-sm);
}

.page-faq .kb-qa-icon {
  position: relative;
  width: 18px;
  height: 18px;
  margin-top: 3px;
  flex: none;
}

.page-faq .kb-qa-icon::before,
.page-faq .kb-qa-icon::after {
  content: "";
  position: absolute;
  inset: 50% 0 auto 0;
  height: 2px;
  border-radius: 2px;
  background: var(--grass);
  transform: translateY(-50%);
  transition: transform .22s var(--ease), opacity .22s var(--ease);
}

.page-faq .kb-qa-icon::after {
  transform: translateY(-50%) rotate(90deg);
}

.page-faq .kb-qa[open] .kb-qa-icon::after {
  transform: translateY(-50%) rotate(0deg);
  opacity: 0;
}

.page-faq .kb-qa-a {
  padding: 0 18px 16px;
  border-top: 1px solid var(--line);
  padding-top: 14px;
  font-size: 14px;
  color: rgba(237, 243, 238, .82);
}

.page-faq .kb-qa-a p {
  margin: 0 0 10px;
  max-width: 68ch;
}

.page-faq .kb-qa-a p:last-child {
  margin-bottom: 0;
}

.page-faq .kb-qa-a a {
  color: var(--grass-soft);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* 字段说明表 */
.page-faq .kb-scroll {
  margin: 12px 0 4px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-faq .kb-fields {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

.page-faq .kb-fields th,
.page-faq .kb-fields td {
  text-align: left;
  padding: 8px 10px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

.page-faq .kb-fields th {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .08em;
  color: var(--mist);
  background: rgba(18, 16, 12, .55);
  white-space: nowrap;
}

.page-faq .kb-fields td:first-child {
  font-family: var(--font-mono);
  color: var(--grass-soft);
  white-space: nowrap;
}

.page-faq .kb-fields tbody tr:last-child td {
  border-bottom: 0;
}

/* ---------- 结尾 ---------- */
.page-faq .kb-close {
  padding-block: clamp(32px, 5vw, 62px);
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(22, 32, 43, .78) 0%, rgba(18, 16, 12, .18) 100%);
}

.page-faq .kb-close-inner {
  display: grid;
  gap: clamp(20px, 3vw, 36px);
}

.page-faq .kb-close h2 {
  margin: 12px 0 0;
  font-size: clamp(1.35rem, 3vw, 2rem);
  font-weight: 800;
  letter-spacing: -.015em;
  color: var(--paper);
}

.page-faq .kb-close-text {
  margin: 12px 0 0;
  max-width: 62ch;
  font-size: 15px;
  color: rgba(237, 243, 238, .8);
}

.page-faq .kb-close-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-content: start;
}

/* ---------- 响应式 ---------- */
@media (max-width: 640px) {
  .page-faq .kb-group-head {
    grid-template-columns: auto minmax(0, 1fr);
  }

  .page-faq .kb-group-count {
    grid-column: 2;
    justify-self: start;
  }

  .page-faq .kb-figure img {
    max-height: 220px;
  }

  .page-faq .kb-qa summary {
    padding: 12px 14px 12px 14px;
    font-size: 14px;
  }

  .page-faq .kb-qa-a {
    padding-inline: 14px;
  }
}

@media (min-width: 720px) {
  .page-faq .kb-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 960px) {
  .page-faq .kb-grid {
    grid-template-columns: var(--kb-rail) minmax(0, 1fr);
  }

  .page-faq .kb-rail {
    position: sticky;
    top: calc(var(--bar-h) + 20px);
  }
}

@media (min-width: 1040px) {
  .page-faq .kb-close-inner {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .kb-qa-icon::before,
  .page-faq .kb-qa-icon::after,
  .page-faq .kb-qa,
  .page-faq .kb-nav a,
  .page-faq .kb-filters .chip {
    transition: none;
  }
}
<<<END>>>