:root {
    --bg: #0f172a;
    --bg-alt: #111827;
    --surface: #ffffff;
    --surface-alt: #f8fafc;
    --text: #111827;
    --text-light: #e5e7eb;
    --muted: #64748b;
    --accent: #0ea5e9;
    --border: #dbe2ea;
    --radius: 16px;
    --shadow: 0 12px 30px rgba(15, 23, 42, 0.08);
    --container: 1200px;
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
    line-height: 1.6;
    color: var(--text);
    background: #fff;
}

img {
    max-width: 100%;
    height: auto;
}

a {
    color: var(--accent);
    text-decoration: none;
}

.container {
    width: min(var(--container), calc(100% - 2rem));
    margin-inline: auto;
}

.prose {
    max-width: 800px;
}

.section {
    padding: 4rem 0;
}

.section--alt {
    background: var(--surface-alt);
}