:root {
    --bg-color: #0d1117;
    --card-bg: #161b22;
    --text-color: #c9d1d9;
    --primary-color: #58a6ff;
    --accent-color: #238636;
    --border-color: #30363d;
    --code-bg: #010409;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    margin: 0;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

header {
    background-color: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

nav a {
    color: var(--text-color);
    text-decoration: none;
    margin-left: 1.5rem;
    font-weight: 600;
}

nav a:hover {
    color: var(--primary-color);
}

main {
    flex: 1;
    max-width: 1000px;
    margin: 2rem auto;
    padding: 0 1rem;
}

.card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

h1, h2, h3 {
    color: var(--primary-color);
}

code, pre {
    font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
    background-color: var(--code-bg);
    padding: 0.2rem 0.4rem;
    border-radius: 3px;
}

pre {
    padding: 1rem;
    overflow-x: auto;
    border: 1px solid var(--border-color);
}

footer {
    text-align: center;
    padding: 2rem;
    border-top: 1px solid var(--border-color);
    font-size: 0.8rem;
    color: #8b949e;
}

.btn {
    display: inline-block;
    background-color: var(--accent-color);
    color: white;
    padding: 0.5rem 1rem;
    text-decoration: none;
    border-radius: 6px;
    font-weight: 600;
}

.btn:hover {
    background-color: #2ea043;
}