.page-faq {
  --faq-rail: 252px;
  --faq-rail-gap: clamp(28px, 4vw, 60px);
  --faq-hair: rgba(201, 207, 216, 0.5);
  position: relative;
  display: block;
  background: var(--bg);
  color: var(--text);
  padding-bottom: clamp(56px, 8vw, 104px);
}

/* 蓝图网格底纹 */
.page-faq::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(201, 207, 216, 0.28) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(201, 207, 216, 0.28) 1px, transparent 1px);
  background-size: var(--grid) var(--grid);
  background-position: center top;
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.9), rgba(0, 0, 0, 0.25) 70%, transparent);
  -webkit-mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.9), rgba(0, 0, 0, 0.25) 70%, transparent);
}

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

/* ── 面包屑行 ───────────────────────────── */
.page-faq .faq-crumb-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 20px;
  padding-top: clamp(14px, 3vw, 26px);
}

.page-faq .faq-route {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--text-mute);
}

/* ── 首屏 ──────────────────────────────── */
.page-faq .faq-hero {
  padding-top: clamp(22px, 4vw, 40px);
}

.page-faq .faq-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 5vw, 48px);
  align-items: end;
}

.page-faq .faq-hero-copy h1 {
  margin: 14px 0 0;
  font-family: var(--font-head);
  font-size: clamp(29px, 5.4vw, 46px);
  font-weight: 900;
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--text);
}

.page-faq .faq-lede {
  margin: 18px 0 0;
  max-width: 38em;
  font-size: 16.5px;
  line-height: 1.78;
  color: var(--text-soft);
}

.page-faq .faq-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

/* 首屏右侧状态面板 */
.page-faq .faq-hero-panel {
  position: relative;
  padding: 22px 22px 20px;
  background: var(--surface);
  border: 1px solid var(--line);
  box-shadow: var(--sh-card);
}

.page-faq .faq-hero-panel::before,
.page-faq .faq-hero-panel::after {
  content: "";
  position: absolute;
  top: -1px;
  height: 3px;
  width: 62px;
}

.page-faq .faq-hero-panel::before {
  left: -1px;
  background: var(--red);
}

.page-faq .faq-hero-panel::after {
  right: -1px;
  background: var(--blue);
}

.page-faq .faq-panel-idx {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--text-mute);
}

.page-faq .faq-stats {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 4px 20px;
}

.page-faq .faq-stats li {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 12px 0 10px;
  border-top: 1px solid var(--line);
}

.page-faq .faq-stats .num {
  font-size: clamp(24px, 3.4vw, 30px);
  line-height: 1.05;
  font-variant-numeric: tabular-nums;
  color: var(--ink);
}

.page-faq .faq-stats .num--red {
  color: var(--red-dark);
}

.page-faq .faq-stats .num--blue {
  color: var(--blue);
}

.page-faq .faq-stat-label {
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--text-mute);
}

.page-faq .faq-panel-note {
  margin: 16px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-soft);
}

/* ── 主体布局 ───────────────────────────── */
.page-faq .faq-body {
  padding-top: clamp(36px, 6vw, 64px);
}

.page-faq .faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 44px);
}

/* 左侧索引 */
.page-faq .faq-rail {
  padding-top: 14px;
  border-top: 2px solid var(--red);
}

.page-faq .faq-rail-title {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--text-mute);
}

.page-faq .faq-rail-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px 12px;
}

.page-faq .faq-rail-list a {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 8px;
  align-items: baseline;
  padding: 7px 8px;
  border-left: 2px solid transparent;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  text-decoration: none;
  font-size: 13px;
  line-height: 1.45;
  color: var(--text-soft);
  transition: background 0.18s var(--ease), color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-faq .faq-rail-list a:hover,
.page-faq .faq-rail-list a:focus-visible {
  background: var(--surface);
  color: var(--text);
  border-left-color: var(--blue);
}

.page-faq .faq-rail-list .mono {
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--text-mute);
}

.page-faq .faq-rail-t {
  display: none;
}

/* ── 分组 ──────────────────────────────── */
.page-faq .faq-group + .faq-group {
  margin-top: clamp(48px, 7vw, 84px);
}

.page-faq .faq-group-head {
  padding-top: 14px;
  border-top: 2px solid var(--ink);
}

.page-faq .faq-group-idx {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--text-mute);
}

.page-faq .faq-group-head h2 {
  margin: 8px 0 0;
  font-family: var(--font-head);
  font-size: clamp(21px, 2.8vw, 27px);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-faq .faq-group-desc {
  margin: 10px 0 20px;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.72;
  color: var(--text-mute);
}

/* 图 */
.page-faq .faq-fig {
  margin: 0 0 22px;
  background: var(--surface);
  border: 1px solid var(--line);
}

.page-faq .faq-fig img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}

.page-faq .faq-fig .figure__cap {
  font-size: 12px;
  letter-spacing: 0.04em;
}

/* ── 手风琴 ─────────────────────────────── */
.page-faq .faq-item {
  border-top: 1px solid var(--line);
  scroll-margin-top: 110px;
}

.page-faq .faq-list > .faq-item:first-child {
  border-top: 0;
}

.page-faq .faq-item > summary {
  list-style: none;
  cursor: pointer;
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr) 20px;
  gap: 10px 12px;
  align-items: start;
  padding: 20px 8px 20px 4px;
  transition: background 0.18s var(--ease), padding-left 0.18s var(--ease);
}

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

.page-faq .faq-item > summary:hover,
.page-faq .faq-item > summary:focus-visible {
  background: rgba(27, 77, 228, 0.045);
  padding-left: 10px;
}

.page-faq .faq-q-no {
  padding-top: 4px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--red-dark);
  font-variant-numeric: tabular-nums;
}

.page-faq .faq-group:nth-of-type(even) .faq-q-no {
  color: var(--blue);
}

.page-faq .faq-q-text {
  font-family: var(--font-head);
  font-size: 16.5px;
  font-weight: 700;
  line-height: 1.55;
  color: var(--text);
}

.page-faq .faq-q-mark {
  position: relative;
  width: 13px;
  height: 13px;
  margin-top: 8px;
  justify-self: end;
}

.page-faq .faq-q-mark::before,
.page-faq .faq-q-mark::after {
  content: "";
  position: absolute;
  background: var(--text-mute);
  transition: transform 0.24s var(--ease), background 0.24s var(--ease);
}

.page-faq .faq-q-mark::before {
  left: 0;
  right: 0;
  top: 50%;
  height: 1px;
  transform: translateY(-50%);
}

.page-faq .faq-q-mark::after {
  top: 0;
  bottom: 0;
  left: 50%;
  width: 1px;
  transform: translateX(-50%);
}

.page-faq .faq-item[open] .faq-q-mark::before {
  background: var(--red);
}

.page-faq .faq-item[open] .faq-q-mark::after {
  transform: translateX(-50%) scaleY(0);
}

.page-faq .faq-item[open] > summary .faq-q-text {
  color: var(--ink);
}

.page-faq .faq-item:target > summary {
  background: rgba(232, 51, 42, 0.05);
}

.page-faq .faq-item:target > summary .faq-q-text {
  color: var(--red-dark);
}

.page-faq .faq-a {
  padding: 0 8px 26px 58px;
  border-top: 1px dashed var(--line);
  padding-top: 16px;
}

.page-faq .faq-a p {
  margin: 0 0 12px;
  max-width: 38em;
  font-size: 16px;
  line-height: 1.78;
  color: var(--text-soft);
}

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

.page-faq .faq-a a {
  color: var(--blue);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.page-faq .faq-a a:hover {
  color: var(--red-dark);
}

/* ── 收尾 ──────────────────────────────── */
.page-faq .faq-outro {
  margin-top: clamp(48px, 7vw, 76px);
  padding: 26px 24px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--blue);
  background: var(--surface);
  box-shadow: var(--sh-card);
}

.page-faq .faq-outro-text {
  margin: 0;
  max-width: 40em;
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
}

.page-faq .faq-outro-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 18px;
}

/* ── 返回顶部 ───────────────────────────── */
.page-faq .faq-top {
  position: fixed;
  right: clamp(14px, 3vw, 30px);
  bottom: clamp(14px, 3vw, 30px);
  z-index: 40;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 16px;
  border: 1px solid var(--line);
  border-radius: var(--pill);
  background: var(--surface);
  box-shadow: var(--sh-pod-sm);
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--text-mute);
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease), transform 0.18s var(--ease);
}

.page-faq .faq-top:hover,
.page-faq .faq-top:focus-visible {
  color: var(--red-dark);
  border-color: var(--red);
  transform: translateY(-2px);
}

/* ── 平板 ───────────────────────────────── */
@media (min-width: 640px) {
  .page-faq .faq-rail-t {
    display: block;
  }

  .page-faq .faq-rail-list {
    gap: 3px 20px;
  }

  .page-faq .faq-hero-panel {
    padding: 26px 26px 24px;
  }
}

/* ── 桌面：索引固定在左 ─────────────────── */
@media (min-width: 1000px) {
  .page-faq .faq-hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-faq .faq-layout {
    grid-template-columns: var(--faq-rail) minmax(0, 1fr);
    gap: var(--faq-rail-gap);
    align-items: start;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: 104px;
    max-height: calc(100vh - 140px);
    overflow-y: auto;
    overscroll-behavior: contain;
  }

  .page-faq .faq-rail-list {
    grid-template-columns: minmax(0, 1fr);
    gap: 2px;
  }
}

/* ── 小屏微调 ───────────────────────────── */
@media (max-width: 639px) {
  .page-faq .faq-item > summary {
    grid-template-columns: 40px minmax(0, 1fr) 18px;
    gap: 8px;
    padding: 18px 4px;
  }

  .page-faq .faq-item > summary:hover,
  .page-faq .faq-item > summary:focus-visible {
    padding-left: 4px;
  }

  .page-faq .faq-a {
    padding: 14px 4px 22px;
  }

  .page-faq .faq-q-text {
    font-size: 15.5px;
  }

  .page-faq .faq-stats {
    gap: 2px 16px;
  }

  .page-faq .faq-outro {
    padding: 22px 18px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq *,
  .page-faq *::before,
  .page-faq *::after {
    transition: none !important;
    animation: none !important;
  }
}