:root {
  --sidebar-bg: #0f1419;
  --sidebar-text: #c4cdd5;
  --sidebar-active: #fff;
  --accent: #f48120;
  --main-bg: #ffffff;
  --border: #e1e4e8;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  height: 100%;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

.layout {
  display: flex;
  min-height: 100vh;
}

.sidebar {
  width: 280px;
  min-width: 280px;
  background: var(--sidebar-bg);
  color: var(--sidebar-text);
  padding: 1.25rem 0;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  border-right: 1px solid #1a2332;
}

.sidebar h1 {
  font-size: 1rem;
  font-weight: 600;
  margin: 0 1rem 0.75rem;
  color: #fff;
  line-height: 1.35;
}

.sidebar .sub {
  font-size: 0.75rem;
  color: #6b7785;
  margin: 0 1rem 1rem;
  line-height: 1.4;
}

.sidebar nav a {
  display: block;
  padding: 0.45rem 1rem;
  color: var(--sidebar-text);
  text-decoration: none;
  font-size: 0.875rem;
  border-left: 3px solid transparent;
}

.sidebar nav a:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.06);
}

.sidebar nav a.active {
  color: var(--sidebar-active);
  background: rgba(244, 129, 32, 0.12);
  border-left-color: var(--accent);
}

main {
  flex: 1;
  min-width: 0;
  background: var(--main-bg);
}

.doc-wrap {
  max-width: 52rem;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}

.markdown-body {
  font-size: 16px;
}

.markdown-body table {
  display: block;
  overflow-x: auto;
}

.loading,
.error {
  padding: 2rem;
  color: #666;
}

.error {
  color: #b00020;
}

@media (max-width: 768px) {
  .layout {
    flex-direction: column;
  }

  .sidebar {
    width: 100%;
    height: auto;
    position: relative;
    max-height: 40vh;
  }
}