/* --- CSS Variables --- */
:root {
    --primary-color: #2563eb;
    --text-color: #1f2937;
    --bg-color: #f9fafb;
    --footer-bg: #e5e7eb;
    --font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

/* --- Modern CSS Reset --- */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

/* --- Base Styles --- */
body {
    font-family: var(--font-family);
    color: var(--text-color);
    background-color: var(--bg-color);
    line-height: 1.6;
    display: flex;
    flex-direction: column;
    min-height: 100vh; /* Keeps the footer at the bottom */
}

/* --- Layout --- */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

header {
    background-color: var(--primary-color);
    color: white;
    padding: 1rem 0;
}

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

header nav ul {
    list-style: none;
    display: flex;
    gap: 1.5rem;
}

header nav a {
    color: white;
    text-decoration: none;
    font-weight: 500;
}

main {
    flex: 1; /* Pushes the footer down */
    padding: 3rem 0;
}

footer {
    background-color: var(--footer-bg);
    text-align: center;
    padding: 1.5rem 0;
    margin-top: auto;
}