:root {
            --color-menu-fondo: #1e293b;  
            --color-menu-texto: #ffffff;  
            --color-menu-hover: #38bdf8;  
            --color-pagina-fondo: #f8fafc; 
            --color-tarjeta-fondo: #ffffff;
            --color-texto-principal: #0f172a; 
            --color-texto-secundario: #64748b;
        }


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

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background-color: var(--color-pagina-fondo);
            color: var(--color-texto-principal);
            display: flex; 
            min-height: 100vh;
        }

        .img-perfil {
    width: 130px;
    border-radius: 50%; 
    border: 3px solid white;
        }    

        .sidebar {
            width: 260px;
            background-color: var(--color-menu-fondo);
            color: var(--color-menu-texto);
            position: fixed; 
            height: 100vh;
            padding: 30px 20px;
            display: flex;
            flex-direction: column;
            justify-content: space-between; 
        }

        .sidebar-perfil {
            text-align: center;
            padding-bottom: 20px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        }

        .sidebar-perfil h2 {
            font-size: 1.2rem;
            margin-bottom: 5px;
        }

        .sidebar-perfil p {
            font-size: 0.85rem;
            color: var(--color-menu-hover);
        }

        .sidebar-nav {
            margin-top: 30px;
            display: flex;
            flex-direction: column;
            gap: 10px;
            flex-grow: 1; 
        }


        .sidebar-nav a {
            color: var(--color-menu-texto);
            text-decoration: none;
            padding: 12px 15px;
            border-radius: 8px;
            font-weight: 500;
            transition: all 0.2s ease;
        }


        .sidebar-nav a:hover {
            background-color: rgba(255, 255, 255, 0.05);
            color: var(--color-menu-hover);
            padding-left: 20px; 
        }

        .sidebar-footer {
            font-size: 0.75rem;
            color: rgba(255, 255, 255, 0.4);
            text-align: center;
        }


        .contenido-principal {
            flex: 1;
            margin-left: 260px; 
            padding: 40px;
        }

        .encabezado-pagina {
            margin-bottom: 40px;
        }

        .encabezado-pagina h1 {
            font-size: 2rem;
            margin-bottom: 10px;
        }

        .encabezado-pagina p {
            color: var(--color-texto-secundario);
            font-size: 1.1rem;
        }


        .grid-proyectos {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 25px;
        }


        .tarjeta {
            background-color: var(--color-tarjeta-fondo);
            border-radius: 12px;
            padding: 25px;
            box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
            border-top: 4px solid var(--color-menu-fondo); 
            transition: transform 0.2s, box-shadow 0.2s;
        }

        .tarjeta:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
        }

        .tarjeta h3 {
            margin-bottom: 12px;
            font-size: 1.25rem;
        }

        .tarjeta p {
            color: var(--color-texto-secundario);
            font-size: 0.95rem;
            line-height: 1.5;
        }