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

        :root {
            /* Colores base */
            --color-text: #333;
            --color-muted: #666;
            --color-bg: #f5f5f5;
            --color-primary: #2563eb;
            --color-primary-hover: #1d4ed8;
            --color-accent: #0077ff;
            --color-accent-hover: #005fcc;
            --color-footer-bg: #111827;
            --color-footer-link: #60a5fa;
            --focus-outline: #93c5fd;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
            color: var(--color-text);
            background: var(--color-bg);
            line-height: 1.6;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }

        /* Header y navegación */
        header {
            background: white;
            padding: 20px 0;
            box-shadow: 0 2px 10px rgba(0,0,0,0.05);
            position: sticky;
            top: 0;
            z-index: 100;
        }

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

        .logo {
            font-size: 1.25rem; /* 20px */
            font-weight: 700;
            color: var(--color-text);
            flex: 0 0 auto;
        }

        .nav-links {
            display: flex;
            gap: 30px;
            list-style: none;
            align-items: center;
            flex: 1;
            justify-content: center;
            margin: 0;
        }

        .nav-links a {
            text-decoration: none;
            color: var(--color-muted);
            font-size: 0.875rem; /* 14px */
            transition: color 0.3s;
        }

        .nav-links a:hover {
            color: var(--color-primary);
        }

        .nav-links a:focus-visible {
            outline: 3px solid #93c5fd;
            outline-offset: 2px;
            border-radius: 4px;
        }