:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --text-main: #1f2937;
    --text-muted: #4b5563;
    --bg-body: #f9fafb;
    --bg-card: #ffffff;
    --border-color: #e5e7eb;
    --code-bg: #1e293b;
    --code-text: #e2e8f0;
    --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
}

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

body {
    font-family: var(--font-sans);
    line-height: 1.6;
    color: var(--text-main);
    background-color: var(--bg-body);
    -webkit-font-smoothing: antialiased;
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.2s;
}

a:hover {
    color: var(--primary-hover);
    text-decoration: underline;
}

/* Layout */
.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Header */
header {
    background-color: var(--bg-card);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 10;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

.github-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 500;
    color: var(--text-muted);
}

.github-link:hover {
    color: var(--text-main);
    text-decoration: none;
}

/* Hero */
.hero {
    background-color: var(--bg-card);
    padding: 4rem 0;
    text-align: center;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 2rem;
}

.hero h1 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 1rem;
    letter-spacing: -0.025em;
    color: var(--text-main);
}

.hero p {
    font-size: 1.25rem;
    color: var(--text-muted);
    max-width: 600px;
    margin: 0 auto 2rem;
}

.hero-actions {
    display: flex;
    justify-content: center;
    gap: 1rem;
}

.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: 0.375rem;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.2s;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    text-decoration: none;
}

.btn-secondary {
    background-color: white;
    color: var(--text-main);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background-color: var(--bg-body);
    text-decoration: none;
}

/* Main Content */
main {
    padding-bottom: 4rem;
}

section {
    margin-bottom: 3rem;
}

h2 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-top: 2.5rem;
    margin-bottom: 1.25rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-main);
}

h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-top: 2rem;
    margin-bottom: 1rem;
    color: var(--text-main);
}

p {
    margin-bottom: 1.25rem;
    color: var(--text-muted);
}

ul {
    margin-bottom: 1.25rem;
    padding-left: 1.5rem;
    color: var(--text-muted);
}

li {
    margin-bottom: 0.5rem;
}

/* Code Blocks */
pre {
    background-color: var(--code-bg);
    color: var(--code-text);
    padding: 1.25rem;
    border-radius: 0.5rem;
    overflow-x: auto;
    margin-bottom: 1.5rem;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    line-height: 1.5;
}

code {
    font-family: var(--font-mono);
    font-size: 0.9em;
}

p code, li code {
    background-color: #f3f4f6;
    color: #c2410c;
    padding: 0.2em 0.4em;
    border-radius: 0.25em;
}

/* Footer */
footer {
    text-align: center;
    padding: 2rem 0;
    color: var(--text-muted);
    font-size: 0.875rem;
    border-top: 1px solid var(--border-color);
    margin-top: 4rem;
}

/* Responsive */
@media (max-width: 640px) {
    .hero h1 {
        font-size: 2rem;
    }
    
    .hero p {
        font-size: 1.125rem;
    }
}