/* ===== 使用指南页 · page-faq ===== */

.page-faq {
  --faq-gap: clamp(10px, 1.4vw, 16px);
  --faq-ease: 160ms cubic-bezier(.2, .7, .3, 1);
}

/* --- 面包屑 --- */
.page-faq .crumbs {
  padding: 22px 0 4px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--rock);
}

.page-faq .crumbs a {
  color: var(--rock);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--faq-ease), border-color var(--faq-ease);
}

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

.page-faq .crumbs__separator {
  margin: 0 8px;
  color: var(--steel);
}

/* --- 首屏 --- */
.page-faq .faq-intro {
  padding-top: clamp(24px, 4vw, 52px);
  padding-bottom: clamp(30px, 5vw, 68px);
}

.page-faq .faq-intro__inner {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
}

.page-faq .faq-intro__title {
  margin: 14px 0 0;
  font-family: var(--sans);
  font-size: clamp(30px, 6.6vw, 60px);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -0.01em;
  color: var(--milk);
  max-width: 17ch;
}

.page-faq .faq-intro .lede {
  margin: 20px 0 0;
  max-width: 46ch;
  font-size: clamp(16px, 1.6vw, 17px);
  line-height: 1.85;
  color: var(--rock);
}

.page-faq .faq-intro .btn {
  margin-top: 26px;
}

.page-faq .faq-intro__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px;
  margin: 0;
  background: var(--steel);
  border: 2px solid var(--steel);
  box-shadow: var(--shadow-hard);
}

.page-faq .faq-intro__facts > div {
  background: var(--ink-800);
  padding: 15px 16px;
}

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

.page-faq .faq-intro__facts dd {
  margin: 7px 0 0;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--milk);
}

.page-faq .faq-intro__facts .num {
  font-family: var(--mono);
  font-size: 21px;
  font-weight: 500;
  color: var(--cyan);
}

/* --- 网格总览区 --- */
.page-faq .faq-board {
  padding-block: clamp(30px, 5vw, 64px);
}

.page-faq .faq-board__head {
  display: grid;
  gap: clamp(20px, 3vw, 36px);
  align-items: end;
  margin-bottom: clamp(22px, 3vw, 34px);
}

.page-faq .faq-board__head .section__title {
  margin: 12px 0 0;
  font-size: clamp(24px, 3.6vw, 38px);
  font-weight: 800;
  line-height: 1.22;
  color: var(--milk);
  max-width: 16ch;
}

.page-faq .faq-board__head .lede {
  margin: 16px 0 0;
  max-width: 50ch;
  font-size: clamp(15px, 1.5vw, 16px);
  line-height: 1.85;
  color: var(--rock);
}

.page-faq .faq-board__figure {
  margin: 0;
  overflow: hidden;
  background: var(--ink-800);
  border: 2px solid var(--steel);
  box-shadow: var(--shadow-hard);
}

.page-faq .faq-board__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 7 / 5;
  object-fit: cover;
}

/* --- 筛选条 --- */
.page-faq .faq-board__filter {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 14px;
}

.page-faq .faq-board__filter .filter-chip {
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .03em;
  color: var(--rock);
  background: var(--ink-800);
  border: 2px solid var(--steel);
  border-radius: var(--radius);
  padding: 8px 13px;
  cursor: pointer;
  transition: color var(--faq-ease), border-color var(--faq-ease), background var(--faq-ease);
}

.page-faq .faq-board__filter .filter-chip:hover,
.page-faq .faq-board__filter .filter-chip:focus-visible {
  color: var(--milk);
  border-color: var(--cyan-deep);
}

.page-faq .faq-board__filter .filter-chip.is-active,
.page-faq .faq-board__filter .filter-chip[aria-pressed="true"] {
  color: var(--ink-900);
  background: var(--cyan);
  border-color: var(--cyan);
}

.page-faq .filter-chip__count {
  display: inline-block;
  margin-left: 6px;
  font-family: var(--mono);
  font-size: 12px;
  opacity: .75;
}

.page-faq .faq-board__status {
  margin: 0 0 18px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .05em;
  color: var(--rock);
}

/* --- 12 格网格 --- */
.page-faq .faq-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--faq-gap);
  align-items: start;
}

.page-faq .faq-item {
  position: relative;
  grid-column: auto;
  background: var(--ink-800);
  border: 2px solid var(--steel);
  border-radius: var(--radius);
  box-shadow: var(--shadow-soft);
  transition: border-color var(--faq-ease), box-shadow var(--faq-ease), transform var(--faq-ease);
}

.page-faq .faq-item:not([open]):hover {
  transform: translate(-2px, -2px);
  border-color: var(--cyan-deep);
  box-shadow: var(--shadow-hard);
}

.page-faq .faq-item[open] {
  grid-column: 1 / -1;
  border-color: var(--cyan);
  box-shadow: var(--shadow-hard);
}

.page-faq .faq-item[open]::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 4px;
  background: var(--cyan);
}

.page-faq .faq-item__summary {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 12px;
  min-height: 96px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
}

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

.page-faq .faq-item__summary::marker {
  content: "";
}

.page-faq .faq-item__summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -5px;
}

.page-faq .faq-item__num {
  flex: 0 0 auto;
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .05em;
  color: var(--gold);
  background: rgba(233, 185, 94, .06);
  border: 1px solid var(--gold-deep);
  border-radius: var(--radius);
  padding: 2px 7px;
}

.page-faq .faq-item__title {
  flex: 1 1 150px;
  font-size: clamp(15px, 1.6vw, 17px);
  font-weight: 700;
  line-height: 1.5;
  color: var(--milk);
}

.page-faq .faq-item__tag {
  flex: 0 0 auto;
}

.page-faq .faq-item__body {
  margin: 0 18px;
  padding: 16px 0 22px;
  border-top: 1px dashed var(--steel);
  animation: faqUnfold var(--faq-ease) both;
}

.page-faq .faq-item__body p {
  margin: 0 0 12px;
  max-width: 66ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--rock);
}

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

.page-faq .faq-item__body a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: rgba(63, 220, 232, .4);
}

.page-faq .faq-item__body a:hover,
.page-faq .faq-item__body a:focus-visible {
  text-decoration-color: var(--cyan);
}

.page-faq .faq-item__step {
  display: inline-block;
  min-width: 5.4em;
  margin-right: 8px;
  padding: 1px 6px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .08em;
  text-align: center;
  color: var(--cyan);
  border: 1px solid var(--steel);
  border-radius: var(--radius);
}

.page-faq .faq-board__empty {
  margin: 18px 0 0;
  padding: 16px 18px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--rock);
  background: var(--ink-800);
  border: 2px dashed var(--steel);
  border-radius: var(--radius);
}

/* --- 出口区 --- */
.page-faq .faq-exit {
  padding-block: clamp(30px, 5vw, 68px) clamp(48px, 7vw, 96px);
}

.page-faq .faq-exit__grid {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
  align-items: start;
}

.page-faq .faq-exit__card {
  padding: clamp(22px, 3vw, 34px);
  background: var(--ink-800);
  border: 2px solid var(--steel);
  box-shadow: var(--shadow-hard);
}

.page-faq .faq-exit__card .section__title {
  margin: 12px 0 20px;
  font-size: clamp(22px, 3vw, 32px);
  font-weight: 800;
  line-height: 1.25;
  color: var(--milk);
  max-width: 18ch;
}

.page-faq .faq-exit__list {
  list-style: none;
  margin: 0 0 20px;
  padding: 0;
  border-top: 1px solid var(--steel);
}

.page-faq .faq-exit__list li {
  display: flex;
  gap: 12px;
  align-items: baseline;
  padding: 12px 0;
  border-bottom: 1px solid var(--steel);
  font-size: 16px;
  line-height: 1.75;
  color: var(--rock);
  user-select: all;
}

.page-faq .faq-exit__no {
  flex: 0 0 auto;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--gold);
}

.page-faq .faq-exit__note {
  margin: 0 0 18px;
  max-width: 52ch;
  font-size: 14px;
  line-height: 1.85;
  color: var(--rock);
}

.page-faq .faq-exit__contact {
  margin: 0 0 22px;
  font-family: var(--mono);
  font-size: 13px;
  line-height: 2;
  color: var(--milk);
  word-break: break-all;
}

.page-faq .faq-exit__figure {
  margin: 0;
  overflow: hidden;
  background: var(--ink-800);
  border: 2px solid var(--steel);
  box-shadow: var(--shadow-hard);
}

.page-faq .faq-exit__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 5 / 4;
  object-fit: cover;
}

/* --- 关键帧 --- */
@keyframes faqUnfold {
  from {
    opacity: 0;
    transform: translateY(-6px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* --- 断点 --- */
@media (min-width: 700px) {
  .page-faq .faq-intro__inner {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    align-items: start;
  }

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

  .page-faq .faq-board__head {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
  }

  .page-faq .faq-exit__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  }

  .page-faq .faq-item__summary {
    min-height: 112px;
  }
}

@media (min-width: 1040px) {
  .page-faq .faq-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-faq .faq-item__summary {
    min-height: 122px;
    align-content: flex-start;
  }
}

/* --- 降级动效 --- */
@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item,
  .page-faq .faq-board__filter .filter-chip,
  .page-faq .crumbs a {
    transition: none;
  }

  .page-faq .faq-item__body {
    animation: none;
  }

  .page-faq .faq-item:not([open]):hover {
    transform: none;
  }
}
<<<END>>>