:root {
    --primary-color: #2c3e50;
    --accent-color: #3498db;
    --bg-color: #f8f9fa;
    --text-color: #343a40;
    --card-shadow: 0 4px 6px -1px rgba(0,0,0,0.05), 0 2px 4px -1px rgba(0,0,0,0.03);
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.main-content {
    flex: 1;
    padding-top: 2rem;
    padding-bottom: 2rem;
}

/* Tarjetas de Login/Contenido */
.card-custom {
    border: none;
    border-radius: 12px;
    background: #fff;
    box-shadow: var(--card-shadow);
    overflow: hidden;
}

.card-header-custom {
    background-color: #fff;
    border-bottom: 1px solid rgba(0,0,0,0.05);
    padding: 1.5rem;
    text-align: center;
}

.card-header-custom i {
    color: var(--accent-color);
    font-size: 2rem;
    margin-bottom: 0.5rem;
    display: block;
}

.card-body-custom {
    padding: 2rem;
}

/* Links y Botones */
a {
    text-decoration: none;
    color: var(--accent-color);
    transition: color 0.2s;
}

a:hover {
    color: #2980b9;
}

.btn-primary {
    background-color: var(--accent-color);
    border-color: var(--accent-color);
    padding: 0.6rem 1.5rem;
    font-weight: 500;
}

.btn-primary:hover {
    background-color: #2980b9;
    border-color: #2980b9;
}

/* Footer Simple */
footer {
    text-align: center;
    padding: 1.5rem;
    color: #6c757d;
    font-size: 0.9rem;
    margin-top: auto;
}