/* ===== 疑问解答页 page-faq ===== */

.page-faq {
  --faq-line: 2px solid var(--line-blue);
  --faq-card-pad: 22px;
  display: block;
}

.page-faq .breadcrumb {
  margin-bottom: 30px;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding: 28px 0 46px;
  overflow: hidden;
}

.page-faq .faq-hero-grid {
  display: grid;
  gap: 30px;
}

.page-faq .faq-hero-copy .section-label {
  margin: 0 0 14px;
}

.page-faq .faq-hero-copy h1 {
  margin: 0 0 18px;
  font-size: clamp(28px, 4.6vw, 50px);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.18;
  color: var(--text-main);
}

.page-faq .faq-hero-copy .lead {
  margin: 0 0 24px;
  max-width: 48ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-dim);
}

.page-faq .faq-jump {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 44px;
  padding: 0 2px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--cyan-glow);
  text-decoration: none;
  border-bottom: var(--faq-line);
  border-bottom-color: rgba(46, 242, 206, 0.4);
}

.page-faq .faq-jump span {
  transition: transform 0.2s var(--ease);
}

.page-faq .faq-jump:hover span,
.page-faq .faq-jump:focus-visible span {
  transform: translateY(3px);
}

.page-faq .faq-jump:focus-visible {
  outline: 2px solid var(--cyan-glow);
  outline-offset: 4px;
}

.page-faq .faq-hero-media {
  margin: 0;
  border: var(--faq-line);
  background: var(--ink-900);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
}

.page-faq .faq-hero-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 12 / 7;
  object-fit: cover;
}

/* ---------- 主体 ---------- */
.page-faq .faq-main {
  padding: 42px 0 56px;
  border-top: 1px solid var(--line-blue);
}

.page-faq .faq-layout {
  display: grid;
  gap: 28px;
  align-items: start;
}

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

.page-faq .faq-tree-label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--text-dim);
}

/* ---------- 分类树 ---------- */
.page-faq .faq-tablist {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 6px;
}

.page-faq .faq-tab {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  min-height: 48px;
  padding: 10px 14px;
  border: 0;
  background: var(--ink-900);
  color: var(--text-dim);
  font-family: inherit;
  font-size: 14px;
  font-weight: 700;
  line-height: 1.4;
  text-align: left;
  cursor: pointer;
  transition: color 0.15s var(--ease), background-color 0.15s var(--ease);
}

.page-faq .faq-tab:hover {
  color: var(--cyan-glow);
}

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

.page-faq .faq-tab[aria-selected="true"] {
  color: var(--text-main);
  background: var(--ink-800);
}

.page-faq .faq-tab::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: var(--signal-orange);
  opacity: 0;
  transition: opacity 0.15s var(--ease);
}

.page-faq .faq-tab[aria-selected="true"]::before {
  opacity: 1;
}

.page-faq .faq-tab-num {
  flex: none;
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--text-dim);
  opacity: 0.65;
}

.page-faq .faq-tab[aria-selected="true"] .faq-tab-num {
  color: var(--signal-orange);
  opacity: 1;
}

/* ---------- 面板 ---------- */
.page-faq .faq-panels {
  min-width: 0;
}

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

.page-faq .faq-panel[hidden] {
  display: none;
}

.page-faq .faq-panel + .faq-panel {
  margin-top: 52px;
}

.page-faq .faq-panel-title {
  margin: 0 0 10px;
  font-size: clamp(20px, 2.4vw, 26px);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--text-main);
}

.page-faq .faq-panel-lead {
  margin: 0;
  max-width: 62ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-dim);
}

.page-faq .faq-panel-head {
  margin-bottom: 22px;
}

/* ---------- 问答卡片 ---------- */
.page-faq .faq-cards {
  position: relative;
  padding-left: var(--faq-card-pad);
}

.page-faq .faq-cards::before {
  content: "";
  position: absolute;
  left: 3px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: var(--line-blue);
}

.page-faq .faq-card {
  position: relative;
  margin: 0;
  border-top: var(--faq-line);
  background: var(--ink-900);
  transition: border-color 0.18s var(--ease), background-color 0.18s var(--ease);
}

.page-faq .faq-card + .faq-card {
  margin-top: 12px;
}

.page-faq .faq-card::before {
  content: "";
  position: absolute;
  left: -23px;
  top: 24px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink-950);
  border: 2px solid var(--line-blue);
  transition: border-color 0.18s var(--ease), background-color 0.18s var(--ease);
}

.page-faq .faq-card[open] {
  border-top-color: var(--cyan-glow);
  background: var(--ink-800);
}

.page-faq .faq-card[open]::before {
  border-color: var(--signal-orange);
  background: var(--signal-orange);
}

.page-faq .faq-q {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  min-height: 56px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
  font-size: 15px;
  font-weight: 800;
  line-height: 1.55;
  color: var(--text-main);
}

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

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

.page-faq .faq-q-mark {
  position: relative;
  flex: none;
  width: 20px;
  height: 20px;
  margin-top: 2px;
  border: 2px solid var(--cyan-glow);
  border-radius: 50%;
}

.page-faq .faq-q-mark::before,
.page-faq .faq-q-mark::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  background: var(--cyan-glow);
}

.page-faq .faq-q-mark::before {
  width: 8px;
  height: 2px;
  transform: translate(-50%, -50%);
}

.page-faq .faq-q-mark::after {
  width: 2px;
  height: 8px;
  transform: translate(-50%, -50%);
  transition: transform 0.18s var(--ease), opacity 0.18s var(--ease);
}

.page-faq .faq-card[open] .faq-q-mark::after {
  transform: translate(-50%, -50%) scaleY(0);
  opacity: 0;
}

.page-faq .faq-a {
  padding: 0 18px 18px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--text-dim);
}

.page-faq .faq-a p {
  margin: 0 0 10px;
  max-width: 64ch;
}

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

.page-faq .faq-next {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px dashed var(--line-blue);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
}

.page-faq .faq-next-label {
  color: var(--text-dim);
  opacity: 0.8;
}

.page-faq .faq-next-link {
  color: var(--cyan-glow);
  text-decoration: none;
  border-bottom: 1px solid rgba(46, 242, 206, 0.45);
  transition: color 0.15s var(--ease), border-color 0.15s var(--ease);
}

.page-faq .faq-next-link::after {
  content: " →";
}

.page-faq .faq-next-link:hover,
.page-faq .faq-next-link:focus-visible {
  color: var(--text-main);
  border-bottom-color: var(--signal-orange);
}

.page-faq .faq-next-link:focus-visible {
  outline: 2px solid var(--cyan-glow);
  outline-offset: 2px;
}

/* ---------- 侧栏配图 ---------- */
.page-faq .faq-side-media {
  margin: 20px 0 0;
  border: var(--faq-line);
  background: var(--ink-900);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
}

.page-faq .faq-side-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

/* ---------- 收尾 ---------- */
.page-faq .faq-outro {
  padding: 0 0 72px;
}

.page-faq .faq-outro-panel {
  display: grid;
  gap: 22px;
  padding: 26px 22px;
  border: var(--faq-line);
  background: var(--ink-900);
  box-shadow: var(--shadow-orange);
}

.page-faq .faq-outro-panel h2 {
  margin: 0 0 10px;
  font-size: clamp(19px, 2.2vw, 24px);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--text-main);
}

.page-faq .faq-outro-panel p {
  margin: 0;
  max-width: 62ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-dim);
}

.page-faq .faq-outro-panel .mono {
  color: var(--cyan-glow);
}

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-faq .faq-hero {
    padding: 36px 0 56px;
  }

  .page-faq .faq-outro-panel {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 32px;
    padding: 32px 34px;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
    gap: 56px;
    align-items: center;
  }
}

@media (min-width: 960px) {
  .page-faq .faq-layout {
    grid-template-columns: 232px minmax(0, 1fr);
    gap: 44px;
  }

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

  .page-faq .faq-tablist {
    grid-template-columns: 1fr;
    gap: 2px;
    padding-left: 14px;
    border-left: 2px solid var(--line-blue);
  }

  .page-faq .faq-tab {
    background: transparent;
  }

  .page-faq .faq-tab[aria-selected="true"] {
    background: var(--ink-800);
  }

  .page-faq .faq-tab::before {
    left: -16px;
    right: auto;
    bottom: auto;
    top: 50%;
    width: 3px;
    height: 0;
    transform: translateY(-50%);
    opacity: 1;
    transition: height 0.15s var(--ease);
  }

  .page-faq .faq-tab[aria-selected="true"]::before {
    height: 62%;
  }
}

@media (min-width: 1024px) {
  .page-faq .faq-panel--media {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 300px;
    gap: 32px;
    align-items: start;
  }

  .page-faq .faq-panel--media .faq-panel-head {
    grid-column: 1 / -1;
    margin-bottom: 0;
  }

  .page-faq .faq-panel--media .faq-side-media {
    margin-top: 0;
  }
}

@media (max-width: 420px) {
  .page-faq .faq-tablist {
    grid-template-columns: 1fr;
  }

  .page-faq .faq-cards {
    --faq-card-pad: 16px;
  }

  .page-faq .faq-cards::before {
    left: 2px;
  }

  .page-faq .faq-card::before {
    left: -17px;
    width: 8px;
    height: 8px;
  }

  .page-faq .faq-q {
    padding: 14px 14px;
    font-size: 14.5px;
  }

  .page-faq .faq-a {
    padding: 0 14px 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq *,
  .page-faq *::before,
  .page-faq *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}