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

html {
  font-size: 15px;
  scroll-behavior: smooth;
}

body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  color: #1e2a3a;
  background: #ffffff;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: 280px;
  background: #1a1c2e;
  display: flex;
  flex-direction: column;
  z-index: 100;
  overflow: hidden;
}

.sidebar-header {
  padding: 20px 24px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}
.sidebar-header .logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: #fff;
  font-size: 16px;
  font-weight: 600;
  letter-spacing: -0.3px;
}
.sidebar-header .logo svg {
  opacity: 0.9;
  flex-shrink: 0;
}
.sidebar-header .logo:hover {
  color: #6c8aff;
}

.sidebar-nav {
  flex: 1;
  overflow-y: auto;
  padding: 16px 0;
}
.sidebar-nav::-webkit-scrollbar {
  width: 4px;
}
.sidebar-nav::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.1);
  border-radius: 4px;
}

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

.nav-group-title {
  padding: 8px 24px 6px;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1.2px;
  color: rgba(160, 163, 189, 0.6);
}

.nav-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.nav-item a {
  display: flex;
  align-items: center;
  padding: 7px 24px;
  font-size: 13.5px;
  color: #a0a3bd;
  text-decoration: none;
  transition: all 0.15s ease;
  border-left: 3px solid transparent;
  line-height: 1.5;
}
.nav-item a .nav-indicator {
  display: none;
}
.nav-item a:hover {
  color: #e4e6f0;
  background: rgba(108, 138, 255, 0.08);
}
.nav-item a.active {
  color: #6c8aff;
  background: rgba(108, 138, 255, 0.12);
  border-left-color: #6c8aff;
  font-weight: 500;
}

.sidebar-footer {
  padding: 16px 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}
.sidebar-footer a {
  display: flex;
  align-items: center;
  gap: 8px;
  color: #a0a3bd;
  text-decoration: none;
  font-size: 13px;
  transition: color 0.15s ease;
}
.sidebar-footer a:hover {
  color: #fff;
}
.sidebar-footer a svg {
  flex-shrink: 0;
}

.content {
  margin-left: 280px;
  min-height: 100vh;
  background: #ffffff;
}

.article {
  max-width: 820px;
  margin: 0 auto;
  padding: 48px 48px 32px;
}

.article-header h1 {
  font-size: 2rem;
  font-weight: 700;
  color: #1e2a3a;
  letter-spacing: -0.5px;
  margin-bottom: 32px;
  padding-bottom: 16px;
  border-bottom: 2px solid #edf0f7;
  line-height: 1.3;
}

.article-body h1 {
  font-size: 1.85rem;
  font-weight: 700;
  color: #1e2a3a;
  margin: 40px 0 20px;
  padding-bottom: 10px;
  border-bottom: 1px solid #e2e8f0;
  letter-spacing: -0.3px;
}
.article-body h2 {
  font-size: 1.5rem;
  font-weight: 600;
  color: #1e2a3a;
  margin: 36px 0 16px;
  letter-spacing: -0.2px;
}
.article-body h3 {
  font-size: 1.2rem;
  font-weight: 600;
  color: #1e2a3a;
  margin: 28px 0 12px;
}
.article-body h4 {
  font-size: 1.05rem;
  font-weight: 600;
  color: #4a5568;
  margin: 24px 0 10px;
}
.article-body p {
  margin: 0 0 16px;
  color: #4a5568;
  line-height: 1.8;
}
.article-body ul,
.article-body ol {
  margin: 0 0 16px;
  padding-left: 24px;
  color: #4a5568;
}
.article-body ul li,
.article-body ol li {
  margin-bottom: 6px;
  line-height: 1.7;
}
.article-body a {
  color: #4a7cf7;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: all 0.15s ease;
}
.article-body a:hover {
  color: #2b5ce6;
  border-bottom-color: #2b5ce6;
}
.article-body code,
.article-body tt {
  font-family: "Fira Code", "Consolas", "Monaco", monospace;
  font-size: 0.88em;
  padding: 2px 6px;
  background: #f7f8fa;
  border: 1px solid #e2e8f0;
  border-radius: 4px;
  color: #e53e3e;
}
.article-body pre {
  margin: 0 0 20px;
  border-radius: 8px;
  overflow: hidden;
}
.article-body pre code {
  display: block;
  padding: 0;
  background: none;
  border: none;
  border-radius: 0;
  color: inherit;
  font-size: 0.87em;
  line-height: 1.65;
}
.article-body .highlight {
  background: #1e2235;
  border: none;
  border-radius: 8px;
  margin: 0 0 20px;
  overflow: auto;
  font-size: 13px;
  line-height: 1.65;
}
.article-body .highlight table {
  width: 100%;
}
.article-body .highlight table .gutter,
.article-body .highlight table .code {
  border: none;
}
.article-body .highlight table .gutter {
  width: 40px;
  background: rgba(0, 0, 0, 0.15);
  border-right: 1px solid rgba(255, 255, 255, 0.06);
}
.article-body .highlight table .gutter pre {
  color: rgba(255, 255, 255, 0.25);
  padding: 16px 12px;
  text-align: right;
  margin: 0;
}
.article-body .highlight table .code {
  width: 99%;
}
.article-body .highlight table .code pre {
  padding: 16px 20px;
  margin: 0;
}
.article-body .highlight pre {
  background: transparent;
  border: none;
  margin: 0;
  color: #e4e6f0;
}
.article-body .highlight .comment {
  color: #636d83;
}
.article-body .highlight .keyword {
  color: #c792ea;
}
.article-body .highlight .string {
  color: #c3e88d;
}
.article-body .highlight .number {
  color: #f78c6c;
}
.article-body .highlight .function {
  color: #82aaff;
}
.article-body .highlight .title {
  color: #ffcb6b;
}
.article-body .highlight .params {
  color: #89ddff;
}
.article-body .highlight .built_in {
  color: #82aaff;
}
.article-body .highlight .attr {
  color: #ffcb6b;
}
.article-body .highlight .variable {
  color: #f07178;
}
.article-body .highlight .meta {
  color: #89ddff;
}
.article-body .highlight .addition {
  color: #c3e88d;
}
.article-body .highlight .deletion {
  color: #f07178;
}
.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 0 0 20px;
  font-size: 0.92em;
}
.article-body table th {
  background: #f7f8fa;
  font-weight: 600;
  text-align: left;
  padding: 10px 14px;
  border: 1px solid #e2e8f0;
  color: #1e2a3a;
}
.article-body table td {
  padding: 9px 14px;
  border: 1px solid #e2e8f0;
  color: #4a5568;
}
.article-body table tr:hover td {
  background: #fafbfd;
}
.article-body blockquote {
  margin: 0 0 20px;
  padding: 12px 20px;
  border-left: 4px solid #6c8aff;
  background: #f0f4ff;
  border-radius: 0 8px 8px 0;
  color: #4a5568;
}
.article-body blockquote p:last-child {
  margin-bottom: 0;
}
.article-body hr {
  border: none;
  height: 1px;
  background: #e2e8f0;
  margin: 32px 0;
}
.article-body img {
  max-width: 100%;
  border-radius: 6px;
  margin: 8px 0;
}
.article-body strong {
  font-weight: 600;
  color: #1e2a3a;
}

.page-nav {
  display: flex;
  justify-content: space-between;
  max-width: 820px;
  margin: 0 auto;
  padding: 24px 48px 48px;
  gap: 16px;
}

.page-nav-prev,
.page-nav-next {
  display: flex;
  flex-direction: column;
  padding: 14px 20px;
  border: 1px solid #e2e8f0;
  border-radius: 8px;
  text-decoration: none;
  transition: all 0.2s ease;
  min-width: 160px;
}
.page-nav-prev:hover,
.page-nav-next:hover {
  border-color: #6c8aff;
  background: #f8f9ff;
  transform: translateY(-1px);
  box-shadow: 0 2px 8px rgba(108, 138, 255, 0.12);
}

.page-nav-next {
  margin-left: auto;
  text-align: right;
}

.page-nav-label {
  font-size: 12px;
  color: #718096;
  margin-bottom: 4px;
  font-weight: 500;
}

.page-nav-title {
  font-size: 14px;
  color: #4a7cf7;
  font-weight: 500;
}

@media (max-width: 1024px) {
  .sidebar {
    width: 240px;
  }
  .content {
    margin-left: 240px;
  }
}
@media (max-width: 768px) {
  .sidebar {
    display: none;
  }
  .content {
    margin-left: 0;
  }
  .article {
    padding: 24px 20px;
  }
  .page-nav {
    padding: 16px 20px 32px;
    flex-direction: column;
  }
}