:root {
    --primary: #2d3748;
    --accent: #6b46c1; 
    --bg: #f7fafc;
    --text: #1a202c;
    --white: #ffffff;
    --code-bg: #2d3748;
    --code-text: #f7fafc;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

body {
    background-color: var(--bg);
    color: var(--text);
    line-height: 1.6;
}

header {
    background-color: var(--white);
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    position: sticky;
    top: 0;
    z-index: 100;
}

nav {
    max-width: 1000px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 2rem;
}

.logo {
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--primary);
    text-decoration: none;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-links a {
    text-decoration: none;
    color: var(--primary);
    font-weight: 500;
    cursor: pointer;
    transition: color 0.2s;
}

.nav-links a:hover, .nav-links a.active {
    color: var(--accent);
    border-bottom: 2px solid var(--accent);
    padding-bottom: 4px;
}

main {
    max-width: 1000px;
    margin: 3rem auto;
    padding: 0 2rem;
}

.page { display: none; }
.page.active { display: block; }

h1 { font-size: 2.5rem; margin-bottom: 1rem; color: var(--primary); }
h2 { font-size: 1.75rem; margin: 2rem 0 1rem 0; color: var(--primary); }
h3 { font-size: 1.25rem; margin: 1.5rem 0 0.5rem 0; color: var(--accent); }
p { margin-bottom: 1.25rem; font-size: 1.1rem; color: #4a5568; }
ul { margin-bottom: 1.25rem; padding-left: 1.5rem; }
li { margin-bottom: 0.5rem; }

.hero {
    background-color: var(--white);
    padding: 3rem;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.02);
    margin-bottom: 2rem;
}

.card {
    background: var(--white);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.02);
    margin-bottom: 2rem;
    border-left: 4px solid var(--accent);
}

pre {
    background-color: var(--code-bg);
    color: var(--code-text);
    padding: 1.5rem;
    border-radius: 6px;
    overflow-x: auto;
    font-family: "Courier New", Courier, monospace;
    font-size: 0.95rem;
    margin: 1rem 0;
}

footer {
    text-align: center;
    padding: 3rem 0;
    color: #a0aec0;
    font-size: 0.9rem;
}