.page-faq {
  --faq-orange: #FF5C00;
  --faq-violet: #8A2BE2;
  --faq-copper: #B87333;
  --faq-panel: #12121B;
  --faq-panel-raised: #171723;
  --faq-line: #2C2C3A;

  background-color: var(--bg-void);
  color: var(--text-primary);
  font-family: var(--font-body);
  line-height: 1.75;
  overflow-x: hidden;
}

/* ===== Hero 框景 ===== */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--line-edge);
  background:
    radial-gradient(ellipse at 82% 15%, rgba(138, 43, 226, 0.2), transparent 55%),
    radial-gradient(ellipse at 12% 88%, rgba(255, 92, 0, 0.1), transparent 50%),
    var(--bg-deep);
}

.page-faq .faq-hero__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(245, 245, 247, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(245, 245, 247, 0.045) 1px, transparent 1px);
  background-size: 44px 44px;
  pointer-events: none;
  z-index: 1;
}

.page-faq .faq-hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(10, 10, 15, 0.15) 0%, rgba(10, 10, 15, 0.72) 100%);
  pointer-events: none;
  z-index: 2;
}

.page-faq .faq-hero__media {
  position: absolute;
  inset: 0;
  z-index: 0;
  opacity: 0.4;
  border-radius: 0;
}

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

.page-faq .faq-hero__corner {
  position: absolute;
  width: 20px;
  height: 20px;
  border-color: var(--faq-copper);
  z-index: 4;
  pointer-events: none;
}

.page-faq .faq-hero__corner--tl {
  top: 12px;
  left: 12px;
  border-top: 2px solid;
  border-left: 2px solid;
}

.page-faq .faq-hero__corner--tr {
  top: 12px;
  right: 12px;
  border-top: 2px solid;
  border-right: 2px solid;
}

.page-faq .faq-hero__corner--bl {
  bottom: 12px;
  left: 12px;
  border-bottom: 2px solid;
  border-left: 2px solid;
}

.page-faq .faq-hero__corner--br {
  bottom: 12px;
  right: 12px;
  border-bottom: 2px solid;
  border-right: 2px solid;
}

.page-faq .faq-hero__inner {
  position: relative;
  z-index: 3;
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 48px 20px 56px;
}

.page-faq .faq-hero__inner .breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-secondary);
  margin: 0 0 24px;
}

.page-faq .faq-hero__inner .breadcrumb a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--ease);
}

.page-faq .faq-hero__inner .breadcrumb a:hover {
  color: var(--flame-orange);
}

.page-faq .faq-hero__inner .breadcrumb__sep {
  color: var(--text-muted);
  font-size: 12px;
}

.page-faq .faq-hero__inner .eyebrow {
  margin-bottom: 12px;
  color: var(--faq-orange);
}

.page-faq .faq-hero__inner h1 {
  font-family: var(--font-title);
  font-size: 30px;
  font-weight: 900;
  line-height: 1.3;
  margin: 0 0 14px;
  letter-spacing: -0.02em;
  max-width: 680px;
}

.page-faq .faq-hero__desc {
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 0 28px;
}

.page-faq .faq-hero__metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  max-width: 460px;
}

.page-faq .faq-hero__metrics .metric-cell {
  background: rgba(18, 18, 27, 0.82);
  border: 1px solid var(--line-edge);
  border-radius: var(--radius-md);
  padding: 12px 14px;
  backdrop-filter: blur(8px);
}

.page-faq .faq-hero__metrics .metric-cell__value {
  font-family: var(--font-title);
  font-size: 26px;
  font-weight: 900;
  color: var(--faq-orange);
  display: block;
  line-height: 1.2;
}

.page-faq .faq-hero__metrics .metric-cell__value--violet {
  color: var(--faq-violet);
}

.page-faq .faq-hero__metrics .metric-cell__value--copper {
  color: var(--faq-copper);
}

.page-faq .faq-hero__metrics .metric-cell__label {
  font-size: 12px;
  color: var(--text-secondary);
  display: block;
  margin-top: 4px;
}

/* ===== 主体布局 ===== */
.page-faq .faq-layout {
  position: relative;
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 16px;
  background-image:
    linear-gradient(rgba(245, 245, 247, 0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(245, 245, 247, 0.02) 1px, transparent 1px);
  background-size: 40px 40px;
}

.page-faq .faq-sidebar {
  margin-top: 24px;
}

.page-faq .faq-sidebar__label {
  font-size: 13px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin: 0 0 10px;
}

.page-faq .faq-sidebar__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 16px;
  scrollbar-width: none;
}

.page-faq .faq-sidebar__list::-webkit-scrollbar {
  display: none;
}

.page-faq .faq-sidebar__list a {
  display: block;
  padding: 7px 14px;
  background: var(--bg-panel);
  border: 1px solid var(--line-edge);
  border-radius: 999px;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 13px;
  white-space: nowrap;
  transition: border-color var(--ease), color var(--ease), background-color var(--ease);
}

.page-faq .faq-sidebar__list a:hover {
  border-color: var(--faq-orange);
  color: var(--faq-orange);
}

.page-faq .faq-sidebar__cta {
  display: none;
}

.page-faq .faq-content {
  padding: 8px 0 72px;
}

.page-faq .faq-section {
  margin-top: 44px;
  scroll-margin-top: 90px;
}

.page-faq .faq-section__header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 20px;
}

.page-faq .faq-section__index {
  font-family: var(--font-title);
  font-size: 13px;
  font-weight: 900;
  color: var(--faq-copper);
  border: 1px solid rgba(184, 115, 51, 0.6);
  border-radius: 50%;
  width: 34px;
  height: 34px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.page-faq .faq-section__header .section-title {
  margin: 0;
  font-size: 22px;
  font-weight: 900;
  font-family: var(--font-title);
}

.page-faq .faq-list {
  display: grid;
  gap: 12px;
}

.page-faq .faq-item {
  background: linear-gradient(135deg, rgba(18, 18, 27, 0.92), rgba(23, 23, 35, 0.88));
  border: 1px solid var(--line-edge);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--ease), box-shadow var(--ease);
}

.page-faq .faq-item:hover {
  border-color: rgba(255, 92, 0, 0.45);
  box-shadow: 0 4px 24px rgba(255, 92, 0, 0.06);
}

.page-faq .faq-item summary {
  list-style: none;
  cursor: pointer;
  padding: 16px 16px 16px 44px;
  font-size: 15px;
  font-weight: 500;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 12px;
  position: relative;
  transition: color var(--ease);
}

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

.page-faq .faq-item summary::before {
  content: '';
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  width: 18px;
  height: 18px;
  border: 1px solid var(--line-edge);
  border-radius: 50%;
  background: var(--bg-panel);
}

.page-faq .faq-item summary::after {
  content: '+';
  position: absolute;
  left: 18px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 13px;
  font-weight: 400;
  color: var(--faq-orange);
  transition: transform var(--ease-smooth);
}

.page-faq .faq-item[open] summary {
  color: var(--faq-orange);
}

.page-faq .faq-item[open] summary::after {
  transform: translateY(-50%) rotate(45deg);
}

.page-faq .faq-item__body {
  padding: 0 16px 18px 44px;
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.8;
}

.page-faq .faq-item__body p {
  margin: 0 0 10px;
}

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

.page-faq .faq-item__link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 6px;
  color: var(--faq-orange);
  font-size: 14px;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--ease), color var(--ease);
}

.page-faq .faq-item__link:hover {
  color: var(--faq-violet);
  border-bottom-color: var(--faq-violet);
}

.page-faq .faq-item__link::after {
  content: ' →';
}

.page-faq .faq-data-flow {
  margin-top: 20px;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--line-edge);
}

.page-faq .faq-data-flow img {
  width: 100%;
  height: auto;
  display: block;
}

/* ===== 桌面端 ===== */
@media (min-width: 900px) {
  .page-faq .faq-hero__inner {
    padding: 72px 32px 80px;
  }

  .page-faq .faq-hero__inner h1 {
    font-size: 44px;
  }

  .page-faq .faq-hero__desc {
    font-size: 16px;
  }

  .page-faq .faq-hero__metrics .metric-cell__value {
    font-size: 30px;
  }

  .page-faq .faq-layout {
    display: grid;
    grid-template-columns: 240px 1fr;
    gap: 48px;
    padding: 0 32px;
    align-items: start;
  }

  .page-faq .faq-sidebar {
    position: sticky;
    top: 24px;
    margin-top: 56px;
  }

  .page-faq .faq-sidebar__label {
    margin-bottom: 14px;
  }

  .page-faq .faq-sidebar__list {
    flex-direction: column;
    overflow: visible;
    gap: 4px;
    padding-bottom: 0;
  }

  .page-faq .faq-sidebar__list a {
    display: block;
    padding: 10px 16px 10px 18px;
    background: transparent;
    border: 0;
    border-left: 2px solid var(--line-edge);
    border-radius: 0;
    white-space: normal;
    font-size: 14px;
    color: var(--text-secondary);
  }

  .page-faq .faq-sidebar__list a:hover {
    border-left-color: var(--faq-orange);
    color: var(--faq-orange);
    background: rgba(255, 92, 0, 0.04);
  }

  .page-faq .faq-sidebar__cta {
    display: block;
    margin-top: 32px;
    background: linear-gradient(135deg, rgba(18, 18, 27, 0.9), rgba(23, 23, 35, 0.7));
    border: 1px solid var(--line-edge);
    border-radius: var(--radius-md);
    padding: 18px 16px;
  }

  .page-faq .faq-sidebar__cta p {
    font-size: 14px;
    color: var(--text-secondary);
    margin: 0 0 12px;
    line-height: 1.6;
  }

  .page-faq .faq-sidebar__cta .btn-ghost {
    display: block;
    text-align: center;
  }

  .page-faq .faq-content {
    padding: 8px 0 96px;
  }

  .page-faq .faq-section {
    margin-top: 56px;
  }

  .page-faq .faq-section__header .section-title {
    font-size: 26px;
  }
}