.page-faq {
  --faq-hair: rgba(22, 24, 26, 0.16);
  --faq-hair-soft: rgba(22, 24, 26, 0.08);
  --faq-open-bg: #F4FBDD;
  background: var(--paper);
  color: var(--ink-950);
  padding-bottom: 72px;
}

/* ---------- 面包屑 ---------- */
.page-faq .crumb {
  padding: 18px 0 0;
}

/* ---------- 首屏：文字 + 方形图 ---------- */
.page-faq .faq-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  margin: 18px 0 42px;
  border: 2px solid var(--ink-950);
  background: var(--paper-3);
  box-shadow: var(--shadow-hard);
  position: relative;
}

.page-faq .faq-hero__text {
  padding: 24px 20px 22px;
  border-bottom: 2px solid var(--ink-950);
}

.page-faq .faq-hero__kicker {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--ink-800);
}

.page-faq .faq-hero__title {
  margin: 8px 0 0;
  font-size: clamp(34px, 8.6vw, 56px);
  font-weight: 900;
  line-height: 1.02;
  letter-spacing: -0.02em;
  color: var(--ink-900);
}

.page-faq .faq-hero__lede {
  margin: 16px 0 0;
  max-width: 40ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink-800);
}

.page-faq .faq-hero__meta {
  margin: 20px 0 0;
  padding-top: 14px;
  border-top: 2px solid var(--faq-hair);
  font-size: 12px;
  line-height: 1.75;
  color: var(--muted);
}

.page-faq .faq-hero__fig {
  margin: 0;
  padding: 0;
  overflow: hidden;
  background: var(--ink-900);
  position: relative;
}

.page-faq .faq-hero__fig img {
  display: block;
  width: 100%;
  height: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  filter: saturate(0.55) contrast(1.12);
}

.page-faq .faq-hero__fig figcaption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 9px 12px;
  background: rgba(14, 26, 20, 0.86);
  color: var(--paper);
  font-size: 12px;
  line-height: 1.6;
}

/* ---------- 主体双轨 ---------- */
.page-faq .faq-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
  align-items: start;
}

/* ---------- 左轨：分组索引 ---------- */
.page-faq .faq-index {
  border: 2px solid var(--ink-950);
  box-shadow: var(--shadow-hard-sm);
  background-color: var(--ink-900);
  background-image: repeating-linear-gradient(
    45deg,
    rgba(199, 244, 100, 0.07) 0 1px,
    transparent 1px 7px
  );
  color: var(--paper);
  padding: 14px 14px 16px;
}

.page-faq .faq-index__head {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin: 0;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--rule);
  font-size: 13px;
  letter-spacing: 0.08em;
}

.page-faq .faq-index__num {
  font-size: 22px;
  font-weight: 700;
  color: var(--accent);
  line-height: 1;
  font-variant-numeric: tabular-nums;
}

.page-faq .faq-index__label {
  color: var(--paper);
}

.page-faq .faq-index__list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-index__link {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 6px 10px;
  border: 2px solid var(--rule);
  color: var(--paper);
  font-size: 13px;
  line-height: 1.5;
  text-decoration: none;
  transition: color var(--t) var(--ease), border-color var(--t) var(--ease), background-color var(--t) var(--ease);
}

.page-faq .faq-index__no {
  font-size: 11px;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(199, 244, 100, 0.08);
  outline: none;
}

.page-faq .faq-index__fig {
  display: none;
  margin: 14px 0 0;
  padding: 0;
}

.page-faq .faq-index__fig img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  border: 2px solid var(--rule);
  filter: saturate(0.5) contrast(1.1);
}

/* ---------- 右侧：问答组 ---------- */
.page-faq .faq-groups {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 40px;
}

.page-faq .faq-group {
  scroll-margin-top: 84px;
}

.page-faq .faq-group__head {
  position: relative;
  margin-bottom: 16px;
}

.page-faq .faq-group__code {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--muted);
}

.page-faq .faq-group__title {
  margin: 4px 0 8px;
  font-size: clamp(22px, 5vw, 30px);
  font-weight: 900;
  line-height: 1.18;
  letter-spacing: -0.02em;
  color: var(--ink-900);
}

.page-faq .faq-group__desc {
  margin: 0;
  padding-bottom: 14px;
  max-width: 44ch;
  border-bottom: 2px solid var(--ink-950);
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-800);
}

/* ---------- 可展开条目 ---------- */
.page-faq .faq-item {
  border: 2px solid var(--ink-950);
  background: var(--paper-3);
}

.page-faq .faq-item + .faq-item {
  margin-top: -2px;
}

.page-faq .faq-item[data-open] {
  position: relative;
  z-index: 1;
  border-color: var(--accent);
  box-shadow: var(--shadow-hard-sm);
}

.page-faq .faq-item[data-open] .expand__trigger {
  background: var(--faq-open-bg);
}

.page-faq .expand__trigger.faq-q {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 12px;
  align-items: start;
  width: 100%;
  margin: 0;
  padding: 16px 14px;
  border: 0;
  background: transparent;
  font: inherit;
  color: inherit;
  text-align: left;
  cursor: pointer;
  transition: background-color var(--t) var(--ease);
}

.page-faq .expand__trigger.faq-q:hover {
  background: var(--paper-2);
}

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

.page-faq .faq-q__code {
  padding-top: 3px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--ink-800);
  font-variant-numeric: tabular-nums;
}

.page-faq .faq-q__body {
  display: block;
  min-width: 0;
}

.page-faq .faq-q__text {
  display: block;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.55;
  color: var(--ink-950);
}

.page-faq .faq-q__tags {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 8px;
}

.page-faq .faq-q__icon {
  position: relative;
  flex: none;
  width: 22px;
  height: 22px;
  margin-top: 2px;
  border: 2px solid var(--ink-950);
  background: var(--paper);
}

.page-faq .faq-q__icon::before,
.page-faq .faq-q__icon::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  background: var(--ink-950);
}

.page-faq .faq-q__icon::before {
  width: 10px;
  height: 2px;
  transform: translate(-50%, -50%);
}

.page-faq .faq-q__icon::after {
  width: 2px;
  height: 10px;
  transform: translate(-50%, -50%);
  transition: transform var(--t) var(--ease);
}

.page-faq .faq-item[data-open] .faq-q__icon {
  background: var(--accent);
}

.page-faq .faq-item[data-open] .faq-q__icon::after {
  transform: translate(-50%, -50%) scaleY(0);
}

/* 面板：不依赖脚本也完整可读 */
.page-faq .faq-item .expand__panel {
  display: none;
  padding: 0 14px 18px;
}

.page-faq .faq-item[data-open] .expand__panel {
  display: block;
}

.page-faq .faq-item[data-open] .expand__panel > * {
  animation: faq-in var(--t) var(--ease) both;
}

@keyframes faq-in {
  from {
    opacity: 0;
    transform: translateX(-10px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.page-faq .faq-a__text {
  margin: 14px 0 0;
  padding-top: 14px;
  border-top: 1px dashed var(--faq-hair);
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.82;
  color: var(--ink-950);
}

.page-faq .faq-a__links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 16px;
  margin: 16px 0 2px;
  padding-top: 12px;
  border-top: 2px solid var(--faq-hair-soft);
}

.page-faq .faq-a__links-label {
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.page-faq .faq-a__link {
  font-size: 14px;
  color: var(--blue);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: border-color var(--t) var(--ease), color var(--t) var(--ease);
}

.page-faq .faq-a__link:hover,
.page-faq .faq-a__link:focus-visible {
  border-bottom-color: var(--blue);
  outline: none;
}

.page-faq .faq-foot {
  margin: 0;
  padding-top: 18px;
  border-top: 2px solid var(--ink-950);
  font-size: 12px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 中屏：出现索引脊与刻度节点 ---------- */
@media (min-width: 720px) {
  .page-faq .faq-groups {
    padding-left: 24px;
  }

  .page-faq .faq-groups::before {
    content: "";
    position: absolute;
    left: 6px;
    top: 6px;
    bottom: 6px;
    width: 2px;
    background: var(--ink-950);
    opacity: 0.32;
  }

  .page-faq .faq-group__head::before {
    content: "";
    position: absolute;
    left: -24px;
    top: 6px;
    width: 12px;
    height: 12px;
    background: var(--accent);
    border: 2px solid var(--ink-950);
  }

  .page-faq .faq-group__title {
    max-width: 26ch;
  }
}

/* ---------- 桌面：双轨布局 ---------- */
@media (min-width: 900px) {
  .page-faq .faq-hero {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  }

  .page-faq .faq-hero__text {
    padding: 38px 30px 32px;
    border-bottom: 0;
    border-right: 2px solid var(--ink-950);
  }

  .page-faq .faq-hero__fig img {
    aspect-ratio: auto;
    min-height: 100%;
  }

  .page-faq .faq-body {
    grid-template-columns: 224px minmax(0, 1fr);
    gap: 40px;
  }

  .page-faq .faq-index {
    position: sticky;
    top: 76px;
    padding: 16px 14px 18px;
  }

  .page-faq .faq-index__list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 2px;
    margin-top: 10px;
  }

  .page-faq .faq-index__link {
    display: flex;
    width: 100%;
    padding: 8px 8px;
    border-color: transparent;
    border-left: 3px solid var(--rule);
  }

  .page-faq .faq-index__fig {
    display: block;
  }

  .page-faq .faq-groups {
    padding-left: 28px;
    gap: 46px;
  }

  .page-faq .faq-group__head::before {
    left: -28px;
  }

  .page-faq .expand__trigger.faq-q {
    padding: 18px 18px;
  }

  .page-faq .faq-item .expand__panel {
    padding: 0 18px 20px;
  }
}

@media (min-width: 1180px) {
  .page-faq .faq-body {
    grid-template-columns: 248px minmax(0, 1fr);
    gap: 52px;
  }

  .page-faq .faq-hero__text {
    padding: 48px 40px 40px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item[data-open] .expand__panel > * {
    animation: none;
  }
}