/* ==========================================================================
   TkSaving 文档中心样式
   设计参考：OpenAI / Anthropic / 阿里云文档风格
   ========================================================================== */

:root {
  --docs-sidebar-width: 260px;
  --docs-primary: #3B82F6;
  --docs-primary-hover: #2563EB;
  --docs-text: #1F2937;
  --docs-text-secondary: #4B5563;
  --docs-text-muted: #9CA3AF;
  --docs-bg: #FFFFFF;
  --docs-sidebar-bg: #F9FAFB;
  --docs-border: #E5E7EB;
  --docs-code-bg: #F3F4F6;
  --docs-radius: 8px;
  --docs-max-width: 820px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto,
    'Helvetica Neue', Arial, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  font-size: 15px;
  color: var(--docs-text-secondary);
  line-height: 1.7;
  background: var(--docs-bg);
}

/* ==========================================================================
   布局
   ========================================================================== */
.docs-layout {
  display: flex;
  min-height: 100vh;
}

.docs-sidebar {
  width: var(--docs-sidebar-width);
  min-width: var(--docs-sidebar-width);
  background: var(--docs-sidebar-bg);
  border-right: 1px solid var(--docs-border);
  height: 100vh;
  position: sticky;
  top: 0;
  overflow-y: auto;
  padding: 24px 0;
}

.docs-content {
  flex: 1;
  min-width: 0;
  padding: 48px 64px 120px;
  max-width: var(--docs-max-width);
}

/* ==========================================================================
   侧边导航
   ========================================================================== */
.docs-nav-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--docs-text);
  padding: 0 20px 16px;
  margin-bottom: 8px;
  border-bottom: 1px solid var(--docs-border);
}

.docs-nav-title a {
  color: var(--docs-text);
  text-decoration: none;
}

.docs-nav-group {
  margin-bottom: 8px;
}

.docs-nav-item.docs-nav-child {
  padding-left: 44px;
  font-size: 12px;
}

/* ==========================================================================
   侧边导航折叠
   ========================================================================== */
.docs-nav-group-title {
  cursor: pointer;
  user-select: none;
  position: relative;
}

.docs-nav-group-title::before {
  content: '';
  display: inline-block;
  width: 0;
  height: 0;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-top: 4px solid var(--docs-text-muted);
  margin-right: 6px;
  vertical-align: middle;
  transition: transform 0.15s;
}

.docs-nav-group-title.active::before {
  transform: rotate(180deg);
}

.docs-nav-group-items {
  display: none;
}

.docs-nav-group-items.open {
  display: block;
}

.docs-nav-item {
  display: block;
  padding: 6px 20px 6px 28px;
  font-size: 13px;
  color: var(--docs-text-secondary);
  text-decoration: none;
  transition: all 0.15s;
  border-left: 3px solid transparent;
}

.docs-nav-item:hover {
  color: var(--docs-primary);
  background: rgba(59, 130, 246, 0.04);
}

.docs-nav-item.active {
  color: var(--docs-primary);
  font-weight: 600;
  border-left-color: var(--docs-primary);
  background: rgba(59, 130, 246, 0.06);
}

/* ==========================================================================
   首页
   ========================================================================== */
.docs-hero {
  text-align: center;
  padding: 40px 0 48px;
  margin-bottom: 48px;
  border-bottom: 1px solid var(--docs-border);
}

.docs-hero h1 {
  font-size: 36px;
  font-weight: 800;
  color: var(--docs-text);
  margin-bottom: 8px;
  letter-spacing: -0.5px;
}

.docs-hero-subtitle {
  font-size: 18px;
  color: var(--docs-text-secondary);
  margin-bottom: 12px;
}

.docs-hero-desc {
  font-size: 15px;
  color: var(--docs-text-muted);
  margin-bottom: 28px;
}

.docs-hero-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
}

.docs-btn-primary {
  display: inline-block;
  background: var(--docs-primary);
  color: #fff;
  padding: 10px 24px;
  border-radius: var(--docs-radius);
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  transition: background 0.15s;
}

.docs-btn-primary:hover {
  background: var(--docs-primary-hover);
  text-decoration: none;
}

.docs-btn-secondary {
  display: inline-block;
  background: #fff;
  color: var(--docs-text);
  border: 1px solid var(--docs-border);
  padding: 10px 24px;
  border-radius: var(--docs-radius);
  font-size: 15px;
  font-weight: 500;
  text-decoration: none;
  transition: all 0.15s;
}

.docs-btn-secondary:hover {
  border-color: var(--docs-text-muted);
  text-decoration: none;
}

.docs-features {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-bottom: 48px;
}

.docs-feature-card {
  background: var(--docs-sidebar-bg);
  border: 1px solid var(--docs-border);
  border-radius: var(--docs-radius);
  padding: 24px;
}

.docs-feature-card h3 {
  font-size: 16px;
  font-weight: 700;
  color: var(--docs-text);
  margin-bottom: 8px;
}

.docs-feature-card p {
  font-size: 14px;
  color: var(--docs-text-secondary);
  line-height: 1.6;
}

.docs-index-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.docs-index-card {
  border: 1px solid var(--docs-border);
  border-radius: var(--docs-radius);
  padding: 24px;
  transition: box-shadow 0.15s;
}

.docs-index-card:hover {
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
}

.docs-index-card h3 {
  font-size: 15px;
  font-weight: 700;
  color: var(--docs-text);
  margin-bottom: 8px;
}

.docs-index-card p {
  font-size: 13px;
  color: var(--docs-text-secondary);
  margin-bottom: 12px;
  line-height: 1.5;
}

.docs-index-card a {
  font-size: 13px;
  color: var(--docs-primary);
  font-weight: 600;
  text-decoration: none;
}

.docs-index-card a:hover {
  text-decoration: underline;
}

/* ==========================================================================
   内容页通用样式
   ========================================================================== */
.docs-article h1 {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
  line-height: 60px;
}

.docs-article h2 {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-primary);
  margin: 16px 0 8px;
  line-height: 42px;
}

.docs-article h2:first-of-type {
  border-top: none;
  padding-top: 0;
}

.docs-article h3 {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
  margin: 14px 0 6px;
  line-height: 36px;
}

.docs-article h4 {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-primary);
  margin: 12px 0 4px;
  line-height: 30px;
}

.docs-article p {
  font-size: 12px;
  color: var(--text-secondary);
  line-height: 24px;
  margin-bottom: 12px;
}

.docs-article b,
.docs-article strong {
  font-weight: 700;
  color: var(--docs-text);
}

.docs-article a {
  color: var(--docs-primary);
  text-decoration: none;
}

.docs-article a:hover {
  text-decoration: underline;
}

.docs-article ul,
.docs-article ol {
  font-size: 12px;
  color: var(--text-secondary);
  line-height: 24px;
  margin: 8px 0 16px 20px;
  padding: 0;
}

.docs-article li {
  margin-bottom: 4px;
}

/* 段落间距统一 16px */
.docs-article h2 + p,
.docs-article h3 + p,
.docs-article h4 + p {
  margin-top: 0;
}

.docs-article p + p {
  margin-top: 16px;
}

.docs-article blockquote {
  border-left: 4px solid var(--docs-primary);
  padding: 12px 18px;
  margin: 16px 0;
  background: #F0F7FF;
  border-radius: 0 var(--docs-radius) var(--docs-radius) 0;
  color: var(--docs-text-secondary);
  font-size: 14px;
}

.docs-article blockquote p:last-child {
  margin-bottom: 0;
}

/* ==========================================================================
   表格
   ========================================================================== */
.docs-article table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0 22px;
  font-size: 14px;
}

.docs-article thead th,
.docs-article thead td {
  background: var(--docs-sidebar-bg);
  font-weight: 600;
  color: var(--docs-text);
  text-align: left;
  padding: 10px 14px;
  border: 1px solid var(--docs-border);
}

.docs-article tbody td {
  padding: 10px 14px;
  border: 1px solid var(--docs-border);
  vertical-align: top;
  line-height: 1.6;
}

.docs-article tbody td:first-child {
  white-space: nowrap;
}

/* 数字列右对齐 */
.docs-article tbody td.num {
  text-align: right;
  font-variant-numeric: tabular-nums;
}

.docs-article tbody tr:nth-child(even) {
  background: #FAFAFA;
}

/* ==========================================================================
   代码块
   ========================================================================== */
.docs-article code {
  font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
  font-size: 13px;
  background: var(--docs-code-bg);
  padding: 2px 6px;
  border-radius: 4px;
  color: #1F2937;
}

.docs-article pre {
  background: #1E293B;
  color: #E2E8F0;
  padding: 16px 20px;
  border-radius: var(--docs-radius);
  overflow-x: auto;
  margin: 14px 0 20px;
  font-size: 13px;
  line-height: 1.7;
}

.docs-article pre code {
  background: none;
  padding: 0;
  color: inherit;
  font-size: inherit;
}

/* ==========================================================================
   提示框
   ========================================================================== */
.docs-callout {
  border-left: 4px solid var(--docs-primary);
  background: #F0F7FF;
  padding: 14px 18px;
  margin: 18px 0;
  border-radius: 0 var(--docs-radius) var(--docs-radius) 0;
  font-size: 14px;
}

.docs-callout b {
  color: var(--docs-primary);
}

.docs-callout.warning {
  border-left-color: #F59E0B;
  background: #FFFBEB;
}

.docs-callout.warning b {
  color: #D97706;
}

.docs-callout.danger {
  border-left-color: #EF4444;
  background: #FEF2F2;
}

.docs-callout.danger b {
  color: #DC2626;
}

/* ==========================================================================
   页脚导航
   ========================================================================== */
.docs-footer-nav {
  display: flex;
  justify-content: space-between;
  margin-top: 56px;
  padding-top: 24px;
  border-top: 1px solid var(--docs-border);
}

.docs-footer-nav a {
  font-size: 14px;
  color: var(--docs-primary);
  font-weight: 600;
  text-decoration: none;
}

.docs-footer-nav a:hover {
  text-decoration: underline;
}

/* ==========================================================================
   响应式
   ========================================================================== */
@media (max-width: 900px) {
  .docs-sidebar {
    display: none;
  }
  .docs-content {
    padding: 32px 24px 80px;
  }
  .docs-hero h1 {
    font-size: 28px;
  }
  .docs-features,
  .docs-index-grid {
    grid-template-columns: 1fr;
  }
}