/* ===== FAQ 页面局部样式 ===== */
.page-faq {
  --faq-line: rgba(138, 157, 191, 0.24);
  --faq-glass: rgba(11, 30, 58, 0.72);
  --faq-glow: rgba(57, 255, 20, 0.16);
  max-width: 1280px;
  margin: 0 auto;
  padding: 1.25rem 1rem 4.5rem;
  font-family: var(--font-body);
  color: var(--primary-text);
  background:
    linear-gradient(rgba(57, 255, 20, 0.028) 1px, transparent 1px),
    linear-gradient(90deg, rgba(57, 255, 20, 0.028) 1px, transparent 1px),
    radial-gradient(ellipse at 88% -4%, rgba(30, 79, 216, 0.28), transparent 58%),
    var(--primary-bg);
  background-size: 44px 44px, 44px 44px, 100% 100%, 100% 100%;
}

/* 面包屑 */
.faq-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-index);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--dim-text);
  margin-bottom: 2rem;
  padding-left: 0.25rem;
}
.faq-breadcrumb a {
  color: var(--dim-text);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--transition), border-color var(--transition);
}
.faq-breadcrumb a:hover {
  color: var(--primary-text);
  border-color: var(--data-highlight);
}
.faq-breadcrumb-divider {
  color: var(--dim-text);
  opacity: 0.5;
}
.faq-breadcrumb-current {
  color: var(--data-highlight);
}

/* Hero 区 */
.faq-hero {
  display: grid;
  gap: 1.75rem;
  margin-bottom: 2rem;
  padding: 0 0 2rem 1rem;
  border-left: 3px solid var(--data-highlight);
  border-bottom: 1px solid var(--faq-line);
}
.faq-hero-tag {
  font-family: var(--font-index);
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  color: var(--dim-text);
  margin-bottom: 1rem;
}
.faq-hero h1 {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(2.6rem, 9vw, 5.2rem);
  line-height: 0.95;
  letter-spacing: 0.06em;
  margin: 0 0 1rem;
}
.faq-h1-accent {
  color: var(--data-highlight);
}
.faq-hero-desc {
  color: var(--dim-text);
  max-width: 32em;
  font-size: 1.05rem;
  line-height: 1.7;
  margin: 0;
}
.faq-hero-quick {
  background: var(--faq-glass);
  border: 1px solid var(--faq-line);
  border-radius: var(--radius);
  padding: 1.25rem 1.4rem;
  display: grid;
  gap: 0.4rem;
  align-content: start;
}
.faq-hero-quick-label {
  font-family: var(--font-index);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  color: var(--dim-text);
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}
.faq-hero-quick a {
  color: var(--primary-text);
  text-decoration: none;
  font-size: 0.9rem;
  padding: 0.35rem 0;
  border-bottom: 1px solid rgba(138, 157, 191, 0.14);
  transition: color var(--transition), padding-left var(--transition);
}
.faq-hero-quick a::before {
  content: "→ ";
  color: var(--data-highlight);
}
.faq-hero-quick a:hover {
  color: var(--data-highlight);
  padding-left: 0.4rem;
}

/* 统计条 */
.faq-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 2.5rem;
  border-bottom: 1px solid var(--faq-line);
  padding-bottom: 1.5rem;
}
.faq-stat {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  padding-right: 1.5rem;
  border-right: 1px solid var(--faq-line);
}
.faq-stat:last-child {
  border-right: none;
}
.faq-stat-num {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: 1.8rem;
  color: var(--data-highlight);
  letter-spacing: 0.03em;
}
.faq-stat-label {
  font-size: 0.85rem;
  color: var(--dim-text);
}

/* 主体布局 */
.faq-layout {
  display: grid;
  gap: 2.25rem;
  align-items: start;
}

/* 目录索引 */
.faq-index {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding: 1rem 0;
  border-top: 1px solid var(--faq-line);
  border-bottom: 1px solid var(--faq-line);
}
.faq-index-label {
  flex-basis: 100%;
  font-family: var(--font-index);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  color: var(--dim-text);
  text-transform: uppercase;
}
.faq-index-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.8rem;
  border: 1px solid var(--faq-line);
  border-radius: 999px;
  text-decoration: none;
  color: var(--primary-text);
  font-size: 0.85rem;
  transition: all var(--transition);
}
.faq-index-num {
  font-family: var(--font-index);
  font-size: 0.7rem;
  color: var(--data-highlight);
}
.faq-index-count {
  font-family: var(--font-index);
  font-size: 0.65rem;
  color: var(--dim-text);
  background: var(--surface-alt);
  border-radius: 50%;
  padding: 0.15rem 0.4rem;
}
.faq-index-link:hover,
.faq-index-link:focus-visible {
  border-color: var(--border-glow);
  color: var(--data-highlight);
}

/* 问答区块 */
.faq-section {
  padding-left: 1rem;
  border-radius: var(--radius);
  scroll-margin-top: 4rem;
  margin-bottom: 3.75rem;
}
.faq-section:target {
  background: rgba(30, 79, 216, 0.1);
  border-left: 2px solid var(--data-highlight);
}
.faq-section-head {
  margin-bottom: 1.5rem;
  padding: 0 1rem 1rem 0;
  border-bottom: 1px solid var(--faq-line);
}
.faq-section-index {
  font-family: var(--font-index);
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  color: var(--data-highlight);
}
.faq-section h2 {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  letter-spacing: 0.04em;
  margin: 0.5rem 0 0.6rem;
}
.faq-section-head p {
  color: var(--dim-text);
  font-size: 1rem;
  margin: 0;
  max-width: 34em;
}

/* 媒体图 */
.faq-media {
  margin: 0 0 1.75rem;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--faq-line);
  background: var(--secondary-bg);
}
.faq-media img {
  display: block;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}
.faq-media--wide {
  max-width: 520px;
}
.faq-media--wide img {
  aspect-ratio: 3 / 2;
}
.faq-media--portrait {
  max-width: 200px;
  margin-left: auto;
  margin-right: auto;
}
.faq-media--portrait img {
  width: 100%;
  aspect-ratio: 1 / 2;
}
.faq-media figcaption {
  font-family: var(--font-index);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  color: var(--dim-text);
  padding: 0.65rem 1rem;
  background: rgba(10, 20, 40, 0.6);
}

/* 问答条目 */
.faq-item {
  position: relative;
  border-bottom: 1px solid var(--faq-line);
  scroll-margin-top: 4rem;
  transition: background var(--transition);
}
.faq-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: transparent;
  transition: background var(--transition), box-shadow var(--transition);
}
.faq-item[open] {
  background: linear-gradient(90deg, rgba(57, 255, 20, 0.06), rgba(11, 30, 58, 0.42) 55%, transparent);
}
.faq-item[open]::before {
  background: var(--data-highlight);
  box-shadow: 0 0 12px var(--border-glow);
}
.faq-item summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.9rem;
  padding: 1.05rem 0.5rem;
  font-weight: 500;
  font-size: 1rem;
  line-height: 1.5;
  color: var(--primary-text);
  transition: color var(--transition);
  user-select: none;
}
.faq-item summary::-webkit-details-marker {
  display: none;
}
.faq-item summary:hover .faq-item-q,
.faq-item[open] summary .faq-item-q {
  color: var(--data-highlight);
}
.faq-item-num {
  font-family: var(--font-index);
  font-size: 0.7rem;
  color: var(--dim-text);
  flex-shrink: 0;
  width: 1.8em;
}
.faq-item[open] .faq-item-num {
  color: var(--data-highlight);
}
.faq-item-q {
  flex: 1;
}
.faq-item-icon {
  flex-shrink: 0;
  width: 1.2rem;
  height: 1.2rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--faq-line);
  border-radius: 50%;
  font-family: var(--font-index);
  font-size: 0.85rem;
  color: var(--dim-text);
  transition: all var(--transition);
}
.faq-item-icon::after {
  content: "+";
  line-height: 1;
}
.faq-item[open] .faq-item-icon {
  transform: rotate(45deg);
  border-color: var(--border-glow);
  color: var(--data-highlight);
}
.faq-item[open] .faq-item-a {
  animation: faqReveal 300ms ease;
}
@keyframes faqReveal {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* 答案正文 */
.faq-item-a {
  padding: 0.25rem 0.5rem 1.5rem 2.7rem;
  color: var(--dim-text);
  line-height: 1.75;
  max-width: 62ch;
}
.faq-item-a p {
  margin: 0 0 0.9rem;
}
.faq-item-a p:last-of-type {
  margin-bottom: 0;
}
.faq-item-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-family: var(--font-index);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--dim-text);
  border: 1px solid var(--faq-line);
  padding: 0.35rem 0.7rem;
  border-radius: 999px;
  transition: all var(--transition);
  margin-top: 0.75rem;
}
.faq-item-link:hover {
  color: var(--data-highlight);
  border-color: var(--border-glow);
}
.faq-item:target {
  background: linear-gradient(90deg, rgba(57, 255, 20, 0.08), transparent 70%);
}
.faq-text-link {
  color: var(--data-highlight);
  text-decoration: none;
  border-bottom: 1px solid var(--border-glow);
  padding-bottom: 1px;
}
.faq-text-link:hover {
  border-bottom-color: var(--data-highlight);
}

/* 导航焕新版左右分栏 */
.faq-section-split {
  display: grid;
  gap: 1.5rem;
}

/* 底部提问 CTA */
.faq-help {
  margin-top: 4.5rem;
}
.faq-help-card {
  background: var(--faq-glass);
  border: 1px solid var(--faq-line);
  border-radius: var(--radius);
  padding: 2rem 1.5rem;
  display: grid;
  gap: 1rem;
  position: relative;
  overflow: hidden;
}
.faq-help-card::after {
  content: "";
  position: absolute;
  right: -40px;
  top: -40px;
  width: 180px;
  height: 180px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(57, 255, 20, 0.12), transparent 70%);
  pointer-events: none;
}
.faq-help-tag {
  font-family: var(--font-index);
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  color: var(--data-highlight);
  text-transform: uppercase;
  margin: 0;
}
.faq-help-card h2 {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: 1.6rem;
  letter-spacing: 0.04em;
  margin: 0;
}
.faq-help-desc {
  color: var(--dim-text);
  margin: 0;
  max-width: 38em;
}
.faq-help-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 0.5rem;
}
.faq-help-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.8rem 1.4rem;
  border-radius: var(--radius);
  font-weight: 500;
  font-size: 0.95rem;
  text-decoration: none;
  transition: all var(--transition);
}
.faq-help-btn--ghost {
  border: 1px solid var(--faq-line);
  color: var(--primary-text);
  background: transparent;
}
.faq-help-btn--ghost:hover {
  border-color: var(--data-highlight);
  color: var(--data-highlight);
}
.faq-help-btn--primary {
  background: var(--cta);
  color: #0a1428;
  border: 1px solid var(--cta);
}
.faq-help-btn--primary:hover {
  filter: brightness(1.1);
  transform: translateY(-2px);
}
.faq-help-note {
  font-family: var(--font-index);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--dim-text);
  margin: 0.9rem 0 0;
  text-align: right;
}

/* 焦点可见性 */
.faq-item summary:focus-visible,
.faq-index-link:focus-visible,
.faq-hero-quick a:focus-visible,
.faq-help-btn:focus-visible,
.faq-breadcrumb a:focus-visible {
  outline: 2px solid var(--data-highlight);
  outline-offset: 2px;
}

/* 小屏微调 */
@media (max-width: 599px) {
  .faq-stat {
    border-right: none;
    padding-right: 0;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--faq-line);
    width: 100%;
  }
  .faq-stat:last-child {
    border-bottom: none;
    padding-bottom: 0;
  }
  .faq-hero {
    padding-left: 0.75rem;
  }
  .faq-item-a {
    padding-left: 2.2rem;
  }
}

/* 桌面布局 */
@media (min-width: 900px) {
  .page-faq {
    padding: 2rem 2.5rem 6rem;
  }
  .faq-hero {
    grid-template-columns: minmax(0, 1fr) minmax(240px, 320px);
    align-items: end;
    gap: 3rem;
    margin-bottom: 2.5rem;
    padding-left: 2rem;
  }
  .faq-layout {
    grid-template-columns: 220px minmax(0, 1fr);
    gap: 3.5rem;
  }
  .faq-index {
    flex-direction: column;
    align-items: stretch;
    position: sticky;
    top: 3rem;
    border: none;
    border-right: 1px solid var(--faq-line);
    padding: 0 1.5rem 0 0;
  }
  .faq-index-link {
    justify-content: space-between;
    border-radius: 0;
    border: none;
    border-bottom: 1px solid var(--faq-line);
    padding: 0.85rem 0;
    background: transparent;
  }
  .faq-index-link:hover,
  .faq-index-link:focus-visible {
    background: linear-gradient(90deg, rgba(57, 255, 20, 0.06), transparent);
  }
  .faq-media--wide {
    margin-left: clamp(2rem, 14%, 7rem);
  }
  .faq-section--split .faq-section-split {
    grid-template-columns: minmax(0, 1fr) 280px;
    gap: 2.5rem;
    align-items: start;
  }
  .faq-media--portrait {
    max-width: none;
  }
  .faq-section:nth-of-type(even) {
    padding-left: 2rem;
  }
  .faq-help-card {
    padding: 2.5rem 3rem;
  }
}