* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
}

body {
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    background-attachment: fixed;
    padding: 2rem;
    position: relative;
}

body::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(44, 62, 80, 0.7); /* Color oscuro con opacidad */
    z-index: 1;
}

.registration-card {
    background: rgba(255, 255, 255, 0.95);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
    width: 100%;
    max-width: 900px;
    margin: 1rem;
    position: relative;
    z-index: 2;
}

.header {
    text-align: center;
    margin-bottom: 1rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid #f0f0f0;
}

.header a {
    text-decoration: none;
}

.header a img{
    width: 4rem;
    height: 100%;
    margin-top: -1rem;
    margin-bottom: -0.5rem;
}

.header h1 {
    font-size: 2.2rem;
    color: #21455a;
    margin-bottom: 0.5rem;
}

.header h2 {
    font-size: 1.2rem;
    color: #7f8c8d;
    font-weight: normal;
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.5rem;
}

@media (max-width: 768px) {
    .form-grid {
        grid-template-columns: 1fr;
    }
    .form-section{
        margin-top: -1.5rem;
    }
}

.form-section {
    background: #f8f9fa;
    padding: 1rem;
    border-radius: 8px;
    margin-bottom: 0.5rem;
}

.form-section-title {
    color: #2c3e50;
    margin-bottom: 1rem;
    font-size: 1.1rem;
    font-weight: 600;
}

.form-group {
    margin-bottom: 0.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: #34495e;
    font-size: 0.9rem;
    font-weight: 500;
}

.form-group input, .form-group select {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #ddd;
    border-radius: 6px;
    font-size: 1rem;
    transition: all 0.3s ease;
}

.form-group input:focus, .form-group select:focus {
    outline: none;
    border-color: #3498db;
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.2);
}

.register-button {
    width: 100%;
    padding: 1rem;
    background-color: #3498db;
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.register-button:hover {
    background-color: #2980b9;
}

.required {
    color: #e74c3c;
    margin-left: 3px;
}