/* ========== 帮助文档页面样式 ========== */

.page-hero {
  padding: 140px 24px 60px;
  background: linear-gradient(180deg, #f0f4ff 0%, #ffffff 100%);
  text-align: center;
}

.page-hero-content h1 {
  font-size: 42px;
  font-weight: 800;
  margin-bottom: 12px;
  letter-spacing: -1px;
}

.page-hero-content p {
  font-size: 18px;
  color: var(--text-secondary);
}

.help-section {
  padding: 40px 24px 100px;
  max-width: 1280px;
  margin: 0 auto;
}

.help-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 40px;
}

/* 左侧导航 */
.help-sidebar {
  position: sticky;
  top: 80px;
  height: fit-content;
  max-height: calc(100vh - 100px);
  overflow-y: auto;
}

.sidebar-search {
  margin-bottom: 20px;
}

.sidebar-search input {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--border);
  border-radius: 100px;
  font-size: 14px;
  outline: none;
  transition: var(--transition);
}

.sidebar-search input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(14,176,133,0.1);
}

.sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.nav-group {
  border-radius: var(--radius-sm);
  overflow: hidden;
  transition: var(--transition);
}

.nav-group.active {
  background: rgba(14,176,133,0.05);
}

.nav-group-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
  cursor: pointer;
  transition: var(--transition);
  border-radius: var(--radius-sm);
  user-select: none;
}

.nav-group-title:hover {
  background: rgba(14,176,133,0.08);
  color: var(--primary);
}

.nav-group.active .nav-group-title {
  color: var(--primary);
  background: rgba(14,176,133,0.1);
}

.nav-arrow {
  font-size: 12px;
  transition: transform 0.3s ease;
  color: var(--text-secondary);
}

.nav-group-items {
  padding: 0 8px;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
}

.nav-group-items .nav-link {
  display: block;
}

.nav-group-items.expanded {
  max-height: 500px;
  padding: 4px 8px 8px;
}

.nav-link {
  display: block;
  padding: 10px 16px 10px 28px;
  font-size: 14px;
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: var(--radius-sm);
  transition: var(--transition);
  position: relative;
}

.nav-link::before {
  content: '';
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 4px;
  background: #cbd5e1;
  border-radius: 50%;
  transition: var(--transition);
}

.nav-link:hover {
  color: var(--primary);
  background: rgba(14,176,133,0.05);
}

.nav-link:hover::before {
  background: var(--primary);
}

/* 右侧内容 */
.help-content {
  min-width: 0;
}

.doc-content {
  background: white;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 40px;
}

.doc-breadcrumb {
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}

.doc-content h1 {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 24px;
  color: var(--text);
}

.doc-body h2 {
  font-size: 20px;
  font-weight: 600;
  margin: 32px 0 16px;
  color: var(--text);
  padding-bottom: 8px;
  border-bottom: 2px solid var(--border);
}

.doc-body p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

.doc-body img {
  max-width: 100%;
  border-radius: var(--radius-sm);
  margin: 16px 0;
}

/* ========== 响应式 ========== */
@media (max-width: 768px) {
  .page-hero {
    padding: 120px 16px 40px;
  }
  .page-hero-content h1 {
    font-size: 28px;
  }

  .help-section {
    padding: 20px 16px 60px;
  }

  .help-layout {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .help-sidebar {
    position: relative;
    top: 0;
    max-height: none;
    order: 0;
  }

  .help-content {
    order: 1;
  }

  .nav-group-title {
    padding: 16px;
    font-size: 16px;
  }

  .nav-group-items.expanded {
    max-height: 500px;
    padding: 8px 12px 12px;
  }

  .nav-link {
    padding: 12px 16px 12px 32px;
    font-size: 15px;
  }

  .doc-content {
    padding: 24px;
  }

  .doc-content h1 {
    font-size: 22px;
  }
}