/**
 * Global stylesheet — the single source of shared styling for this project.
 *
 * No CSS framework is used here (deliberate decision, see AGENTS.md
 * "Conventions"). Extend this file additively as pages/components grow;
 * don't add page-scoped <style> blocks or inline style="..." attributes.
 */

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
    color: #222;
    background: #fafafa;
    line-height: 1.5;
}

header {
    background: #1f2d3d;
}

nav {
    max-width: 960px;
    margin: 0 auto;
    display: flex;
    gap: 1.5rem;
    padding: 1rem 1.5rem;
}

nav a {
    color: #cfd8e3;
    text-decoration: none;
    font-weight: 600;
    padding: 0.25rem 0;
    border-bottom: 2px solid transparent;
}

nav a:hover {
    color: #fff;
}

nav a.active {
    color: #fff;
    border-bottom-color: #4f9dff;
}

main {
    max-width: 960px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
    min-height: 60vh;
    background: #fff;
}

main h1 {
    margin-top: 0;
}

footer {
    text-align: center;
    padding: 1.5rem;
    color: #777;
    font-size: 0.875rem;
}