:root {
  --lighter-bg: #06060c;
  --lighter-bg-secondary: #121218;
  --lighter-bg-tertiary: #1f1f24;
  --lighter-border: #2b2b30;
  --lighter-border-hover: #515155;
  --lighter-text-primary: #f3f3f3;
  --lighter-text-secondary: #b4b4b6;
  --lighter-text-tertiary: #828285;
  --lighter-accent: #5e85ff;
  --lighter-accent-hover: #8eaaff;
  --lighter-green: #1bd289;
  --lighter-radius: 0.25rem;
  --lighter-font: Inter, system-ui, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
}

*, *::before, *::after {
  box-sizing: border-box;
}

.faq-page,
.about-page {
  background-color: var(--lighter-bg);
  color: var(--lighter-text-primary);
  font-family: var(--lighter-font);
  font-size: 14px;
  font-weight: 400;
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

.page-wrapper {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 24px 80px;
}

.page-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background-color: var(--lighter-bg);
  border-bottom: 1px solid var(--lighter-border);
  padding: 0 24px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.page-header-inner {
  max-width: 900px;
  margin: 0 auto;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-logo {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: var(--lighter-text-primary);
  font-size: 15px;
  font-weight: 500;
}

.site-logo svg {
  width: 14px;
  height: 25px;
  flex-shrink: 0;
}

.header-nav {
  display: flex;
  align-items: center;
  gap: 20px;
}

.header-nav a {
  color: var(--lighter-text-secondary);
  text-decoration: none;
  font-size: 13px;
  font-weight: 400;
  transition: color 0.15s ease;
}

.header-nav a:hover {
  color: var(--lighter-text-primary);
}

.header-nav a.active {
  color: var(--lighter-text-primary);
}

.page-hero {
  padding: 64px 0 48px;
  border-bottom: 1px solid var(--lighter-border);
  margin-bottom: 48px;
}

.page-hero h1 {
  font-size: 28px;
  font-weight: 600;
  line-height: 1.25;
  color: var(--lighter-text-primary);
  margin: 0 0 12px;
  letter-spacing: -0.01em;
}

.page-hero p {
  font-size: 15px;
  color: var(--lighter-text-secondary);
  margin: 0;
  max-width: 560px;
  line-height: 1.6;
}

.page-content h2 {
  font-size: 18px;
  font-weight: 600;
  color: var(--lighter-text-primary);
  margin: 0 0 20px;
  letter-spacing: -0.01em;
}

.page-content h3 {
  font-size: 14px;
  font-weight: 600;
  color: var(--lighter-text-primary);
  margin: 0 0 8px;
}

.page-content p {
  font-size: 14px;
  color: var(--lighter-text-secondary);
  line-height: 1.65;
  margin: 0 0 16px;
}

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

.page-content a {
  color: var(--lighter-accent);
  text-decoration: none;
  transition: color 0.15s ease;
}

.page-content a:hover {
  color: var(--lighter-accent-hover);
}

.content-section {
  margin-bottom: 56px;
}

.content-section:last-of-type {
  margin-bottom: 0;
}

.content-card {
  background-color: var(--lighter-bg-secondary);
  border: 1px solid var(--lighter-border);
  border-radius: var(--lighter-radius);
  padding: 20px 24px;
  margin-bottom: 12px;
  transition: border-color 0.15s ease;
}

.content-card:hover {
  border-color: var(--lighter-border-hover);
}

.content-card:last-child {
  margin-bottom: 0;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.card-grid .content-card {
  margin-bottom: 0;
}

.faq-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.faq-item {
  background-color: var(--lighter-bg-secondary);
  border: 1px solid var(--lighter-border);
  border-radius: var(--lighter-radius);
  overflow: hidden;
  transition: border-color 0.15s ease;
}

.faq-item:hover {
  border-color: var(--lighter-border-hover);
}

.faq-item[open] {
  border-color: var(--lighter-border-hover);
}

.faq-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  cursor: pointer;
  list-style: none;
  color: var(--lighter-text-primary);
  font-size: 13px;
  font-weight: 500;
  line-height: 1.4;
  user-select: none;
  gap: 16px;
  transition: background-color 0.15s ease;
}

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

.faq-item summary:hover {
  background-color: var(--lighter-bg-tertiary);
}

.faq-item[open] summary {
  background-color: var(--lighter-bg-tertiary);
  border-bottom: 1px solid var(--lighter-border);
}

.faq-chevron {
  flex-shrink: 0;
  width: 14px;
  height: 14px;
  color: var(--lighter-text-tertiary);
  transition: transform 0.2s ease, color 0.15s ease;
}

.faq-item[open] .faq-chevron {
  transform: rotate(180deg);
  color: var(--lighter-text-secondary);
}

.faq-answer {
  padding: 16px 20px;
  color: var(--lighter-text-secondary);
  font-size: 13px;
  line-height: 1.65;
}

.faq-answer p {
  font-size: 13px;
  margin: 0 0 12px;
  color: var(--lighter-text-secondary);
}

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

.faq-answer a {
  color: var(--lighter-accent);
  text-decoration: none;
}

.faq-answer a:hover {
  color: var(--lighter-accent-hover);
}

.inline-link-block {
  background-color: var(--lighter-bg-secondary);
  border: 1px solid var(--lighter-border);
  border-radius: var(--lighter-radius);
  padding: 16px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  text-decoration: none;
  color: var(--lighter-text-primary);
  font-size: 13px;
  transition: border-color 0.15s ease, background-color 0.15s ease;
  margin-bottom: 8px;
}

.inline-link-block:hover {
  border-color: var(--lighter-border-hover);
  background-color: var(--lighter-bg-tertiary);
  color: var(--lighter-text-primary);
}

.inline-link-block .link-label {
  font-weight: 500;
}

.inline-link-block .link-desc {
  font-size: 12px;
  color: var(--lighter-text-tertiary);
  margin-top: 2px;
}

.inline-link-block .link-arrow {
  color: var(--lighter-text-tertiary);
  flex-shrink: 0;
}

.link-block-inner {
  flex: 1;
}

.btn-home {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background-color: var(--lighter-bg-secondary);
  border: 1px solid var(--lighter-border);
  border-radius: var(--lighter-radius);
  padding: 8px 16px;
  color: var(--lighter-text-primary);
  font-size: 12px;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: border-color 0.15s ease, background-color 0.15s ease;
}

.btn-home:hover {
  border-color: var(--lighter-border-hover);
  background-color: var(--lighter-bg-tertiary);
  color: var(--lighter-text-primary);
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: linear-gradient(#5e85ff -37.5%, #5578e7 66.99%, #4c6cce 97.5%);
  border: none;
  border-radius: var(--lighter-radius);
  padding: 8px 16px;
  color: #fff;
  font-size: 12px;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: opacity 0.15s ease;
}

.btn-primary:hover {
  opacity: 0.85;
  color: #fff;
}

.page-footer {
  border-top: 1px solid var(--lighter-border);
  margin-top: 64px;
  padding-top: 32px;
  padding-bottom: 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.page-footer-nav {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}

.page-footer-nav a {
  color: var(--lighter-text-tertiary);
  text-decoration: none;
  font-size: 12px;
  transition: color 0.15s ease;
}

.page-footer-nav a:hover {
  color: var(--lighter-text-secondary);
}

.page-footer-copy {
  font-size: 12px;
  color: var(--lighter-text-tertiary);
}

.divider {
  border: none;
  border-top: 1px solid var(--lighter-border);
  margin: 40px 0;
}

.tag {
  display: inline-flex;
  align-items: center;
  background-color: var(--lighter-bg-tertiary);
  border: 1px solid var(--lighter-border);
  border-radius: var(--lighter-radius);
  padding: 2px 8px;
  font-size: 11px;
  color: var(--lighter-text-tertiary);
  font-weight: 500;
}

.highlight-text {
  color: var(--lighter-green);
}

.accent-text {
  color: var(--lighter-accent);
}

.text-muted {
  color: var(--lighter-text-tertiary);
}

.stat-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 12px;
}

.stat-card {
  background-color: var(--lighter-bg-secondary);
  border: 1px solid var(--lighter-border);
  border-radius: var(--lighter-radius);
  padding: 20px;
}

.stat-card .stat-value {
  font-size: 22px;
  font-weight: 600;
  color: var(--lighter-text-primary);
  margin-bottom: 4px;
  letter-spacing: -0.02em;
}

.stat-card .stat-label {
  font-size: 12px;
  color: var(--lighter-text-tertiary);
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 32px;
  font-size: 12px;
}

.breadcrumb a {
  color: var(--lighter-text-tertiary);
  text-decoration: none;
  transition: color 0.15s ease;
}

.breadcrumb a:hover {
  color: var(--lighter-text-secondary);
}

.breadcrumb span {
  color: var(--lighter-text-tertiary);
}

.breadcrumb .current {
  color: var(--lighter-text-secondary);
}

.notice-box {
  background-color: rgba(94, 133, 255, 0.08);
  border: 1px solid rgba(94, 133, 255, 0.2);
  border-radius: var(--lighter-radius);
  padding: 14px 18px;
  font-size: 13px;
  color: var(--lighter-text-secondary);
  margin-bottom: 20px;
}

.notice-box a {
  color: var(--lighter-accent);
  text-decoration: none;
}

.notice-box a:hover {
  color: var(--lighter-accent-hover);
}

.bottom-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 56px;
  padding-top: 32px;
  border-top: 1px solid var(--lighter-border);
}

@media (max-width: 768px) {
  .page-wrapper {
    padding: 0 16px 60px;
  }

  .page-header {
    padding: 0 16px;
  }

  .page-hero {
    padding: 40px 0 32px;
    margin-bottom: 32px;
  }

  .page-hero h1 {
    font-size: 22px;
  }

  .page-hero p {
    font-size: 14px;
  }

  .card-grid {
    grid-template-columns: 1fr;
  }

  .stat-row {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-footer {
    flex-direction: column;
    align-items: flex-start;
  }

  .header-nav {
    gap: 12px;
  }

  .content-section {
    margin-bottom: 40px;
  }

  .faq-item summary {
    padding: 14px 16px;
    font-size: 13px;
  }

  .faq-answer {
    padding: 14px 16px;
  }

  .bottom-actions {
    margin-top: 40px;
  }
}

@media (max-width: 480px) {
  .stat-row {
    grid-template-columns: 1fr;
  }

  .page-hero h1 {
    font-size: 20px;
  }

  .header-nav {
    display: none;
  }
}