:root {
    --bg-white: #ffffff;
    --bg-soft: #f8f9fa;
    --text-main: #1a1a1b;
    --text-muted: #65676b;
    --border-light: #e4e6eb;
    --accent-dark: #000000;
    --selection-bg: #000000;
    --selection-text: #ffffff;
}

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

body { 
    background-color: var(--bg-white); 
    color: var(--text-main); 
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif; 
    line-height: 1.7; 
    padding: 80px 24px; 
    max-width: 720px; 
    margin: auto; 
    -webkit-font-smoothing: antialiased;
}

h1 {
    color: var(--accent-dark);
    border-bottom: 2px solid var(--accent-dark);
    padding-bottom: 20px;
    margin-bottom: 32px;
    font-size: 2rem;
    font-weight: 800;
    letter-spacing: -0.02em;
}

h2 {
    color: var(--accent-dark);
    margin-top: 48px;
    margin-bottom: 16px;
    font-size: 1.25rem;
    font-weight: 700;
    border-left: 4px solid var(--accent-dark);
    padding-left: 16px;
}

p {
    margin-bottom: 20px;
}

ul {
    padding-left: 24px;
    margin-bottom: 28px;
}

li {
    margin-bottom: 12px;
}

li strong {
    color: var(--accent-dark);
}

.highlight {
    color: var(--accent-dark);
    background-color: var(--bg-soft);
    padding: 3px 6px;
    border-radius: 4px;
    font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
    font-size: 0.9em;
    border: 1px solid var(--border-light);
}

a {
    color: var(--text-main);
    text-decoration: underline;
    text-decoration-thickness: 1px;
    text-underline-offset: 3px;
    font-weight: 500;
    transition: opacity 0.2s ease;
}

a:hover {
    opacity: 0.6;
}

.footer {
    margin-top: 80px;
    font-size: 0.85rem;
    color: var(--text-muted);
    border-top: 1px solid var(--border-light);
    padding-top: 32px;
}

::selection {
    background: var(--selection-bg);
    color: var(--selection-text);
}