:root {
  --bg-color: #ffffff;
  --text-color: #24292f;
  --sidebar-width: 280px;
  --sidebar-bg: #f6f8fa;
  --border-color: #d0d7de;
  --link-color: #0969da;
  --hover-color: #f3f4f6;
  --accent-color: #0969da;
}

* {
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
  line-height: 1.5;
  color: var(--text-color);
  background-color: var(--bg-color);
  margin: 0;
  display: flex;
  min-height: 100vh;
}

/* Sidebar */
.sidebar {
  width: var(--sidebar-width);
  background: var(--sidebar-bg);
  border-right: 1px solid var(--border-color);
  padding: 2rem;
  flex-shrink: 0;
  position: fixed;
  height: 100vh;
  overflow-y: auto;
}

.sidebar h1 {
  font-size: 1.5rem;
  margin-top: 0;
  margin-bottom: 0.5rem;
}

.sidebar h1 a {
  color: inherit;
  text-decoration: none;
}

.sidebar .description {
  font-size: 0.9rem;
  color: #57606a;
  margin-bottom: 2rem;
}

.nav-section {
  margin-bottom: 2rem;
}

.nav-section h3 {
  font-size: 0.75rem;
  text-transform: uppercase;
  color: #57606a;
  margin-bottom: 0.5rem;
}

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

.nav-links li {
  margin-bottom: 0.25rem;
}

.nav-links a {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem;
  color: var(--text-color);
  text-decoration: none;
  border-radius: 6px;
  transition: background 0.2s;
  font-size: 0.95rem;
}

.nav-links a:hover, .nav-links a.active {
  background: var(--hover-color);
  color: var(--link-color);
}

.nav-links .icon {
  font-size: 1.1em;
}

/* Main Content */
.main-content {
  flex-grow: 1;
  padding: 4rem;
  margin-left: var(--sidebar-width);
  max-width: 900px;
}

h1, h2, h3, h4, h5, h6 {
  margin-top: 2rem;
  margin-bottom: 1rem;
  font-weight: 600;
  line-height: 1.25;
}

h1 { font-size: 2rem; border-bottom: 1px solid var(--border-color); padding-bottom: 0.3em; }
h2 { font-size: 1.5rem; border-bottom: 1px solid var(--border-color); padding-bottom: 0.3em; }

a { color: var(--link-color); text-decoration: none; }
a:hover { text-decoration: underline; }

code {
  background-color: #afb8c133;
  padding: 0.2em 0.4em;
  border-radius: 6px;
  font-family: ui-monospace, SFMono-Regular, SF Mono, Menlo, Consolas, Liberation Mono, monospace;
}

pre {
  background-color: #f6f8fa;
  padding: 1rem;
  border-radius: 6px;
  overflow-x: auto;
}

blockquote {
  margin: 0;
  padding: 0 1em;
  color: #57606a;
  border-left: 0.25em solid #d0d7de;
}

/* Utilities */
.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tag {
  background: #eaeef2;
  color: var(--text-color);
  padding: 0.25rem 0.5rem;
  border-radius: 2rem;
  font-size: 0.85rem;
  text-decoration: none!important;
}

.tag:hover {
  background: var(--link-color);
  color: white;
}

.game-container {
  width: 100%;
  aspect-ratio: 16/9;
  border: none;
  background: #000;
}

@media (max-width: 768px) {
  body {
    flex-direction: column;
  }
  .sidebar {
    position: relative;
    width: 100%;
    height: auto;
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
    border-right: none;
  }
  .main-content {
    margin-left: 0;
    padding: 2rem 1rem;
  }
}