:root {
    --primary-color: #3498db; /* A nice blue */
    --secondary-color: #2ecc71; /* A complementary green */
    --background-color: #f8f9fa; /* Light grey background */
    --surface-color: #ffffff; /* White for content background */
    --text-color: #212529; /* Dark grey for text */
    --muted-color: #6c757d; /* Muted grey for less important text */
    --border-color: #dee2e6;
    --shadow-color: rgba(0, 0, 0, 0.075);
    --font-family-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
    --border-radius: 12px;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family-sans);
    line-height: 1.7;
    margin: 0;
    padding: 2rem 1rem;
    background-color: var(--background-color);
    color: var(--text-color);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    background: var(--surface-color);
    padding: 2rem 3rem;
    border-radius: var(--border-radius);
    box-shadow: 0 8px 32px var(--shadow-color);
    border: 1px solid var(--border-color);
}

h1, h2, h3, h4, h5, h6 {
    color: var(--text-color);
    font-weight: 700;
    margin-top: 0.5em;
    margin-bottom: 1em;
    line-height: 1.3;
}

h1 {
    font-size: 2.5rem;
    color: var(--primary-color);
}

h2 {
    font-size: 2rem;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 0.5rem;
}

h3 {
    font-size: 1.5rem;
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.2s ease-in-out, background-color 0.2s ease-in-out;
}

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

img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    margin: 1.5rem 0;
}

blockquote {
    border-left: 5px solid var(--primary-color);
    background-color: #f1f3f5;
    margin: 1.5rem 0;
    padding: 1rem 1.5rem;
    color: var(--muted-color);
    border-radius: 0 8px 8px 0;
}

code {
    background-color: #e9ecef;
    color: var(--text-color);
    padding: 0.2em 0.4em;
    border-radius: 4px;
    font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, Courier, monospace;
}

hr {
    border: none;
    border-top: 1px solid var(--border-color);
    margin: 3rem 0;
}

@media (max-width: 768px) {
    body {
        padding: 1rem 0;
    }
    .container {
        padding: 1.5rem;
        border-radius: 0;
        border: none;
        border-top: 1px solid var(--border-color);
        border-bottom: 1px solid var(--border-color);
    }
    h1 {
        font-size: 2rem;
    }
    h2 {
        font-size: 1.75rem;
    }
}