.page-faq {
  --faq-gap: clamp(1.25rem, 3vw, 2.5rem);
  --faq-radius: 0.875rem;
  --faq-icon-size: 1.4rem;
  padding: calc(var(--gutter) * 0.5) 0 calc(var(--gutter) * 2.5);
  background: var(--grad-bg);
  color: var(--color-text);
}

.page-faq .faq-wrap {
  padding-inline: var(--gutter);
}

.page-faq .breadcrumbs {
  margin-bottom: 1.75rem;
}

.page-faq .faq-hero {
  margin-bottom: 2.25rem;
}

.page-faq .page-kicker {
  color: var(--color-red);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.page-faq .faq-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(1.85rem, 4vw, 3.1rem);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -0.02em;
  margin: 0.55rem 0 1rem;
  color: var(--color-text);
}

.page-faq .page-lead {
  color: var(--color-dim);
  font-size: 1rem;
  line-height: 1.8;
  max-width: 48rem;
}

/* 仪表板概览 */
.page-faq .faq-telemetry {
  display: grid;
  gap: 1.25rem;
  background: linear-gradient(135deg, var(--color-card), var(--color-bg-alt));
  border: 1px solid var(--color-border);
  border-radius: var(--faq-radius);
  padding: 1.25rem 1.25rem 1.5rem;
  margin-bottom: 2.5rem;
  position: relative;
  box-shadow: 0 0 0 1px rgba(0, 168, 255, 0.06), 0 1.5rem 3rem rgba(0, 0, 0, 0.35);
}

.page-faq .faq-telemetry::before,
.page-faq .faq-telemetry::after {
  content: "";
  position: absolute;
  width: 1.75rem;
  height: 1.75rem;
  border: 2px solid var(--color-blue);
  pointer-events: none;
}

.page-faq .faq-telemetry::before {
  top: -1px;
  left: -1px;
  border-right: 0;
  border-bottom: 0;
}

.page-faq .faq-telemetry::after {
  bottom: -1px;
  right: -1px;
  border-left: 0;
  border-top: 0;
}

.page-faq .telemetry {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
}

.page-faq .metric {
  padding: 0.75rem 0.85rem;
  border-left: 2px solid var(--color-blue);
  background: rgba(0, 168, 255, 0.04);
}

.page-faq .metric-value {
  font-family: var(--font-mono);
  font-size: 1.6rem;
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-gold);
  display: block;
}

.page-faq .metric-label {
  color: var(--color-dim);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  margin-top: 0.25rem;
  display: block;
}

.page-faq .faq-resolution {
  border-top: 1px dashed var(--color-border);
  padding-top: 1.1rem;
}

.page-faq .resolution-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 0.6rem;
}

.page-faq .resolution-title {
  color: var(--color-text);
  font-size: 0.85rem;
  font-weight: 600;
}

.page-faq .resolution-value {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-blue);
}

.page-faq .resolution-track {
  height: 0.5rem;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 999px;
  overflow: hidden;
  border: 1px solid var(--color-border);
}

.page-faq .resolution-fill {
  display: block;
  width: 96%;
  height: 100%;
  background: linear-gradient(90deg, var(--color-blue), var(--color-blue) 70%, var(--color-red));
  border-radius: inherit;
  animation: faq-steady 1.2s ease-out both;
}

@keyframes faq-steady {
  from { width: 0; }
  to { width: 96%; }
}

.page-faq .resolution-note {
  color: var(--color-dim);
  font-size: 0.72rem;
  margin-top: 0.55rem;
  font-family: var(--font-mono);
}

/* 两列布局 */
.page-faq .faq-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--faq-gap);
  align-items: start;
}

/* 侧边栏 */
.page-faq .faq-sidebar {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--faq-radius);
  padding: 1.1rem;
  position: sticky;
  top: 1rem;
}

.page-faq .sidebar-title {
  font-family: var(--font-display);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-dim);
  margin: 0 0 0.85rem;
  padding-bottom: 0.6rem;
  border-bottom: 1px solid var(--color-border);
}

.page-faq .faq-index {
  display: flex;
  flex-direction: row;
  gap: 0.45rem;
  overflow-x: auto;
  padding-bottom: 0.25rem;
  scrollbar-width: thin;
}

.page-faq .faq-index-link {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 0.75rem;
  border-radius: 0.5rem;
  color: var(--color-text);
  border: 1px solid transparent;
  background: rgba(255, 255, 255, 0.02);
  text-decoration: none;
  white-space: nowrap;
  transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
  flex-shrink: 0;
}

.page-faq .faq-index-link:hover,
.page-faq .faq-index-link:focus-visible {
  background: rgba(0, 168, 255, 0.1);
  border-color: rgba(0, 168, 255, 0.35);
  outline: none;
  color: var(--color-blue);
}

.page-faq .faq-icon {
  width: var(--faq-icon-size);
  height: var(--faq-icon-size);
  color: var(--color-blue);
  flex-shrink: 0;
}

.page-faq .index-num {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--color-gold);
}

.page-faq .index-name {
  font-size: 0.88rem;
  font-weight: 600;
}

.page-faq .index-status {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--color-dim);
  background: var(--color-bg-alt);
  padding: 0.15rem 0.4rem;
  border-radius: 999px;
  white-space: nowrap;
}

.page-faq .faq-sidebar-note {
  margin-top: 1rem;
  padding-top: 0.85rem;
  border-top: 1px dashed var(--color-border);
  text-align: center;
}

.page-faq .faq-sidebar-note p {
  color: var(--color-dim);
  font-size: 0.85rem;
  margin: 0 0 0.55rem;
}

/* 右侧内容 */
.page-faq .faq-content {
  display: grid;
  gap: 0.25rem;
}

.page-faq .faq-section {
  padding: 0.25rem 0 0.5rem;
  scroll-margin-top: 2rem;
}

.page-faq .faq-section-head {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  margin-bottom: 0.9rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--color-border);
}

.page-faq .section-index {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  color: var(--color-red);
  font-weight: 700;
  line-height: 1;
}

.page-faq .faq-section-titles {
  flex: 1;
}

.page-faq .section-kicker {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--color-dim);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin: 0 0 0.2rem;
}

.page-faq .section-title {
  font-family: var(--font-display);
  font-size: 1.45rem;
  font-weight: 700;
  margin: 0;
  line-height: 1.2;
  color: var(--color-text);
}

.page-faq .faq-section-head .chip {
  margin-left: auto;
}

/* 折叠面板 */
.page-faq .faq-list {
  display: grid;
  gap: 0.65rem;
}

.page-faq .faq-item {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: 0.65rem;
  transition: border-color 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.page-faq .faq-item[open] {
  border-color: rgba(0, 168, 255, 0.5);
  box-shadow: 0 0 0 1px rgba(0, 168, 255, 0.15), 0 0.75rem 1.5rem rgba(0, 0, 0, 0.2);
  background: linear-gradient(135deg, var(--color-card), rgba(0, 168, 255, 0.05));
}

.page-faq .faq-item summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.9rem 2.75rem 0.9rem 1rem;
  font-weight: 600;
  font-size: 0.95rem;
  line-height: 1.4;
  color: var(--color-text);
  transition: color 0.2s ease;
  position: relative;
  user-select: none;
}

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

.page-faq .faq-item summary:hover,
.page-faq .faq-item:not([open]):hover summary {
  color: var(--color-blue);
}

.page-faq .faq-item summary::before {
  content: "";
  width: 0.38rem;
  height: 0.38rem;
  background: var(--color-red);
  border-radius: 50%;
  flex-shrink: 0;
  box-shadow: 0 0 0 3px rgba(255, 46, 63, 0.12);
}

.page-faq .faq-item[open] summary::before {
  background: var(--color-blue);
  box-shadow: 0 0 0 3px rgba(0, 168, 255, 0.12);
}

.page-faq .faq-item summary::after {
  content: "";
  position: absolute;
  right: 1rem;
  top: 50%;
  width: 0.55rem;
  height: 0.55rem;
  border-right: 2px solid var(--color-blue);
  border-bottom: 2px solid var(--color-blue);
  transform: translateY(-65%) rotate(45deg);
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.page-faq .faq-item[open] summary::after {
  transform: translateY(-35%) rotate(225deg);
}

.page-faq .faq-answer {
  padding: 0 1.1rem 1.05rem 1.9rem;
  color: var(--color-dim);
  font-size: 0.92rem;
  line-height: 1.8;
}

.page-faq .faq-answer p {
  margin: 0;
}

.page-faq .faq-answer a {
  color: var(--color-blue);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 168, 255, 0.4);
  transition: border-color 0.2s ease, color 0.2s ease;
}

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

/* 数据图片 */
.page-faq .faq-data-media {
  margin: 1.25rem 0 0;
  max-width: 36rem;
}

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

/* 问题提交区块 */
.page-faq .faq-contact-block {
  margin-top: 1.5rem;
  display: grid;
  gap: 1rem;
  background: linear-gradient(135deg, rgba(26, 35, 51, 0.8), rgba(20, 26, 42, 0.6));
  border: 1px solid var(--color-border);
  border-radius: var(--faq-radius);
  padding: 1.25rem;
  position: relative;
  overflow: hidden;
}

.page-faq .faq-contact-block::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--color-glow);
  pointer-events: none;
}

.page-faq .faq-contact-text {
  position: relative;
  z-index: 1;
}

.page-faq .faq-contact-text .slash-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-gold);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  background: rgba(255, 215, 0, 0.08);
  padding: 0.2rem 0.55rem;
  border-radius: 0.25rem;
}

.page-faq .faq-contact-text p {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--color-text);
  margin: 0.7rem 0 1rem;
  line-height: 1.3;
}

.page-faq .faq-contact-media {
  margin: 0;
  border-radius: 0.5rem;
  overflow: hidden;
  border: 1px solid var(--color-border);
  max-height: 16rem;
}

.page-faq .faq-contact-media img {
  max-height: 16rem;
  object-fit: cover;
  width: 100%;
}

.page-faq .faq-data-media figcaption,
.page-faq .faq-contact-media figcaption {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--color-dim);
  padding: 0.5rem 0.65rem;
  background: rgba(11, 14, 20, 0.7);
  border-top: 1px solid var(--color-border);
}

/* 数据流分隔线 */
.page-faq .dataflow {
  margin: 0.5rem 0;
  height: 1px;
  background: repeating-linear-gradient(90deg, var(--color-border) 0 6px, transparent 6px 12px);
}

/* 桌面端 */
@media (min-width: 1080px) {
  .page-faq .faq-hero {
    margin-bottom: 2.75rem;
  }

  .page-faq .faq-telemetry {
    grid-template-columns: 1fr 1fr;
    align-items: stretch;
    gap: 2rem;
    padding: 1.75rem 2rem 1.9rem;
  }

  .page-faq .telemetry {
    grid-template-columns: repeat(4, 1fr);
    gap: 0.6rem;
  }

  .page-faq .metric {
    padding: 0.9rem 0.75rem;
  }

  .page-faq .faq-resolution {
    border-top: 0;
    border-left: 1px dashed var(--color-border);
    padding-top: 0;
    padding-left: 1.75rem;
    display: flex;
    flex-direction: column;
    justify-content: center;
  }

  .page-faq .faq-layout {
    grid-template-columns: 18.5rem 1fr;
    gap: var(--faq-gap);
  }

  .page-faq .faq-sidebar {
    padding: 1.35rem 1.1rem;
    position: sticky;
    top: 1rem;
    max-height: calc(100vh - 2rem);
    overflow-y: auto;
  }

  .page-faq .faq-index {
    flex-direction: column;
    gap: 0.35rem;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-faq .faq-index-link {
    white-space: normal;
    padding: 0.7rem 0.8rem;
  }

  .page-faq .faq-content {
    gap: 1.75rem;
  }

  .page-faq .faq-section {
    scroll-margin-top: 1.5rem;
  }

  .page-faq .faq-contact-block {
    grid-template-columns: 1fr 1.2fr;
    align-items: center;
    padding: 1.5rem;
  }

  .page-faq .faq-contact-text p {
    font-size: 1.5rem;
  }

  .page-faq .faq-contact-media {
    max-height: 18rem;
  }

  .page-faq .faq-contact-media img {
    max-height: 18rem;
  }

  .page-faq .faq-data-media {
    margin-left: auto;
    margin-right: 0;
  }
}

/* 窄屏细节 */
@media (max-width: 400px) {
  .page-faq .telemetry {
    grid-template-columns: 1fr;
  }

  .page-faq .faq-item summary {
    padding-right: 2.25rem;
  }

  .page-faq .faq-index-link {
    padding: 0.55rem 0.6rem;
  }

  .page-faq .index-status {
    display: none;
  }
}