:root {
    --primary-color: #007bff;
    --secondary-color: #6c757d;
    --background-light: #f8f9fa;
    --background-dark: #343a40;
    --text-light: #ffffff;
    --text-dark: #212529;
}

body {
    font-family: 'Arial', sans-serif;
    background-color: var(--background-light);
    color: var(--text-dark);
    margin: 0;
    padding: 20px;
    transition: background 0.3s, color 0.3s;
}

h1, h2 {
    color: var(--primary-color);
    text-align: center;
}

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

.card {
    background: white;
    padding: 20px;
    margin: 15px auto;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

button {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 10px 15px;
    cursor: pointer;
    border-radius: 5px;
    transition: 0.3s;
}

button:hover {
    background: #0056b3;
}

input, select {
    padding: 10px;
    margin: 5px;
    border: 1px solid #ccc;
    border-radius: 5px;
    width: 100%;
}

.pagination {
    display: flex;
    justify-content: center;
    margin-top: 20px;
}

.pagination a {
    padding: 10px 15px;
    margin: 5px;
    text-decoration: none;
    background: var(--primary-color);
    color: white;
    border-radius: 5px;
    transition: 0.3s;
}

.pagination a:hover {
    background: #0056b3;
}

/* Modo Oscuro */
.dark-mode {
    background-color: var(--background-dark);
    color: var(--text-light);
}

.dark-mode .card {
    background: #495057;
    color: var(--text-light);
}