/* Reset y configuración global */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Contenedor principal */
.container {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

/* Tarjeta del formulario */
.form-card {
    background: white;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    padding: 40px;
    width: 100%;
    max-width: 500px;
    animation: slideIn 0.5s ease-out;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Header */
.header {
    text-align: center;
    margin-bottom: 30px;
}

.header h1 {
    color: #333;
    font-size: 28px;
    margin-bottom: 10px;
}

.header p {
    color: #666;
    font-size: 14px;
}

/* Ícono */
.icon {
    width: 60px;
    height: 60px;
    margin: 0 auto 20px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 30px;
}

/* Grupos de formulario */
.form-group {
    margin-bottom: 25px;
}

.form-group label {
    display: block;
    color: #333;
    font-weight: 600;
    margin-bottom: 8px;
    font-size: 14px;
}

.form-group select {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid #e0e0e0;
    border-radius: 10px;
    font-size: 15px;
    color: #333;
    background-color: #f8f9fa;
    transition: all 0.3s ease;
    cursor: pointer;
}

.form-group select:focus {
    outline: none;
    border-color: #667eea;
    background-color: white;
}

.form-group select:hover {
    border-color: #667eea;
}

.form-group select:disabled {
    cursor: not-allowed;
    opacity: 0.6;
}

/* Contenedor de botones */
.btn-container {
    display: flex;
    justify-content: center;
    margin-top: 35px;
}

/* Botón siguiente */
.btn-siguiente {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 14px 50px;
    border-radius: 25px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.btn-siguiente:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.6);
}

.btn-siguiente:active {
    transform: translateY(0);
}

.btn-siguiente:disabled {
    background: #ccc;
    cursor: not-allowed;
    box-shadow: none;
    transform: none;
}

/* Footer */
footer {
    background-color: rgba(0, 0, 0, 0.2);
    color: white;
    text-align: center;
    padding: 20px;
    font-size: 14px;
}

footer p {
    margin: 5px 0;
}

/* Responsive */
@media (max-width: 768px) {
    .form-card {
        padding: 30px 20px;
    }

    .header h1 {
        font-size: 24px;
    }

    .btn-siguiente {
        padding: 12px 40px;
        font-size: 15px;
    }
}